JP3587722B2 - Check valve for drain pipe - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention is suitably implemented in drain pipes provided in drainage generating devices such as indoor units of home and commercial air conditioners, in-vehicle air conditioners of automobiles, refrigerators, and vending machines for soft drinks. To a check valve that can perform
[0002]
[Prior art]
In an air conditioner provided in a general house, a small amount of drainage is generated by a cooling operation, a dehumidifying operation, and the like. In order to discharge this wastewater to the outdoors, the indoor unit is provided with a flexible drain pipe made of soft vinyl chloride or the like, and this drain pipe extends, for example, to a site drain pipe laid outdoors. The outlet is open to the inside of the site drain pipe. By such a drain pipe, drainage such as dew water generated in the indoor unit flows down in the drain pipe due to gravity and is discharged to a site drain pipe.
[0003]
[Problems to be solved by the invention]
In this conventional technique, the drain pipe extends from the indoor unit to the site drain pipe, and can guide drainage from the indoor unit to the site drain pipe. The outside air flows backward to the indoor unit due to the wind or the differential pressure between the inside and outside, and the odor enters the room. In addition, there is a problem that mosquitoes, insects such as cockroaches, and small animals such as mice invade the indoor unit through the drain pipe from the site drain pipe.
[0004]
An object of the present invention is to provide a check valve for a drain pipe that can reliably discharge a small amount of water and prevent backflow of outside air and invasion of insects and small animals.
[0005]
[Means for Solving the Problems]
The present invention(A)Drain pipe is connectedA valve box arranged such that the axis is parallel to the vertical direction,,
(A1)A valve hole, a valve chamber on the downstream side in the discharge direction of drainage flowing from the drain pipe to the valve hole;And a valve passage through which drainage can flow from above to below from an opening at one end in the axial direction disposed on the upper side to an opening at the other end in the axial direction disposed on the lower side.Is formed,
(A2)In the valve roomMikatsuSurround the valve holeIn part,An annular valve seat is formed,
(A3) In addition to the openings at both ends in the axial direction, holes for opening the valve chamber to the atmosphere are formed,
(A4) An inner wall is formed from the portion where the valve seat is formed, protruding into the valve chamber outside the valve seat and covering the air vent hole from the inside.Valve box,
(B)A valve body made of a material having soft elasticity, a center portion of which is held by a valve box, and a valve body which is formed to be inclined in a direction approaching a valve seat as a peripheral portion becomes radially outward,
(B1)The peripheral portion has an outermost peripheral portion and a valve seat facing portion on the radially inner side of the outermost peripheral portion,
(B2)The outermost portion and the valve seat facing portion are provided to face the valve seat,
(B3)In a state where the valve seat opposing portion is separated from the valve seat, the outermost peripheral portion is seated on the valve seat over the entire circumferential direction to close the valve hole,
(B4)At least part of the outermost peripheral part is separated from the valve seat by the attachment of drainage and opens a valve hole,
(B5)A check valve for a drain pipe characterized in that, when air is going to flow backward from the downstream side in the drainage discharge direction, the valve seat facing portion includes a valve body seated on the valve seat.
[0006]
According to the invention, the valve box comprises:A valve passage having a valve hole and a valve chamber and through which drainage can flow from an opening at one axial end to an opening at the other axial end is formed, and a valve seat is formed around the valve hole. Have been.valve seatIs in the valve roomFormed facing downstream in the discharge directioning.A valve body made of a material having soft elasticity is held at the center of the valve box. The valve body is formed so as to be inclined in a direction approaching the valve seat as the peripheral portion becomes radially outward, and the peripheral portion is opposed to the outermost peripheral portion and the valve seat on the radially inner side of the outermost peripheral portion. The outermost portion and the valve seat facing portion face the valve seat. With such a valve body, the outermost peripheral portion is seated on the valve seat from the downstream side in the discharge direction over the entire circumference in a state where the valve seat opposing portion is separated from the valve seat, and the valve hole is closed.
In this valve body, at least a part of the outermost peripheral portion of the peripheral portion is elastically deformed by a small amount of drainage flowing into the valve hole from the drain pipe and separated from the valve seat, and the drainage passes through the drainage downstream. Allowably, it can be discharged from the valve hole to the valve chamber side. In addition, the valve body is formed such that the peripheral edge portion is inclined, and only the outermost peripheral portion is seated on the valve seat in a state where the valve seat facing portion is separated from the valve seat. Therefore, the seating area of the valve body with respect to the valve seat can be made as small as possible, and preferably, a line contact state or a narrow surface contact state close thereto can be achieved. In this way, the seating area is reduced so that the drainage can be moved outward as much as possible, and since the valve body is made of a material having soft elasticity, even a small amount of drainage can be easily deformed. Even the wastewater can be deformed and discharged.
Also, when the outside air tries to flow backward in the drain pipe in the direction opposite to the discharge direction, the entire periphery of the peripheral portion is pressed in a direction pressed against the valve seat, and the valve seat opposing portion is seated on the valve seat. Enlarge the area to increase airtightness. Further, as the pressure of the backflowing outside air is higher, the pressing pressure against the valve seat at the peripheral portion becomes stronger, and the valve body can reliably prevent the backflow of the outside air. In this way, the valve element can reliably discharge a small amount of drainage, and can reliably prevent the reverse flow of outside air.
Further, even if insects and small animals try to invade in the direction opposite to the discharge direction, the outermost peripheral portion of the valve body is seated on the valve seat, so that the insects and small animals may not move between the valve body peripheral edge and the valve seat. There is no gap that can be interrupted, which can reliably prevent insects and small animals from entering the valve hole from the valve chamber.
Further, a hole for opening the valve chamber to the atmosphere is formed in the valve box separately from the openings at both ends in the axial direction. This can prevent the pressure in the valve chamber from becoming excessive when air is going to flow backward. Therefore, it is possible to prevent the valve body from being pressed by the air that is going to flow backward and being deformed significantly. In this way, it is possible to prevent a problem that the valve body does not normally seat on the valve seat. Further, the valve box has an inner wall that protrudes from the portion where the valve seat is formed into the valve chamber outside the valve seat and covers the air vent hole from the inside. This prevents the waste water from leaking out of the air vent hole when the waste water is discharged. Therefore, it is possible to prevent the leakage of the drainage and to prevent the valve chamber from being excessively pressurized.
[0007]
Also, since the valve body is held at the center and the peripheral edge is seated on the valve seat, a small amount of drainage can be placed in the valve seat at the bottom of the peripheral edge regardless of the orientation of the valve body. The small amount of drainage is discharged to the valve chamber side by pushing open in a direction away from the small valve, and high responsiveness to the small amount of drainage can be achieved.
[0008]
Therefore, such a check valve for a drain pipe is provided at an arbitrary position such as an intermediate unit and an outlet end of a drain pipe of an indoor unit of an air conditioner of a general house, an air conditioner of a vehicle, a refrigerator and a vending machine. As a result, a small amount of wastewater generated by these devices can be reliably discharged, and in addition, the invasion of bad smell into the room due to the backflow of outside air and the invasion of insects and small animals can be reliably prevented. Furthermore, it is possible to prevent the transfer of heat energy due to the intrusion of the outside air, that is, the removal of cold and warm heat, and thereby it is possible to improve the operation efficiency of each device.
[0009]
Further, the invention is characterized in that the valve body has an inner region formed in a flat shape on a radially inner side of a peripheral portion.
[0010]
According to the present invention, since the valve element has the flat inner region portion, the valve element can be held in the valve box at the central portion, and the valve element can be provided so that only the outermost peripheral portion is seated on the valve seat. .
[0011]
Further, according to the present invention, the valve seat opposing portion is separated from the valve seat with a space between the valve seat opposing portion and the valve seat so that drainage can be sucked by capillary action,
When air is going to flow backward from the discharge direction downstream of the drainage, the inner region part radially inward from the peripheral edge is deformed so as to be located on the upstream side in the discharge direction, and the valve seat gradually decreases from the radial inside. It is characterized by being seated.
According to the present invention, the valve seat opposing portion of the valve element is separated from the valve seat with a space between the valve seat opposing portion and the valve seat so that drainage can be sucked by capillary action. Thus, even if only one drop of drainage is guided without kinetic energy in the discharge direction, the drainage can be sucked between the valve seat-facing portion and the valve seat. When the drainage is sucked in this way, the valve body is made of a material having soft elasticity, so that the valve body is elastically deformed by being pressed by the drainage, so that the entire peripheral portion is separated from the valve seat so that the outermost peripheral portion is separated from the valve seat. Deforms so as to separate from the valve seat. In this state, the distance from the valve seat at the peripheral edge becomes smaller as it goes radially outward, so that the drainage is further radially outward by capillary action, specifically, the outermost peripheral portion and the valve seat. Guided between.
In the state where the drainage is guided between the outermost peripheral portion and the valve seat by the capillary phenomenon, when the pressure of the outside air that is going to flow backward acts on the valve body, the peripheral edge that is in contact with the valve seat via the drainage. The inner region portion on the radially inner side than the portion is deformed so as to be located on the upstream side in the discharge direction, the valve body is further pressed, and the valve is gradually seated on the valve seat from the radially inner side. In this way, the valve body is seated on the valve seat from the radially inward side when the drainage is held between the valve seat and the outside air is pressed in a direction opposite to the discharge direction to try to flow backward, The drainage guided between the valve body and the valve seat is pushed radially outward. In this way, even a very small amount of waste water of one drop can be discharged by utilizing the air that is about to flow backward, and after the waste water is discharged, the outermost peripheral portion and the valve seat opposing portion become the valve seat. The seat can be closed to close the valve hole.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a cross-sectional view showing a check valve 1 for a drain pipe according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along section line II-II in FIG. 1, and FIG. It is sectional drawing seen from the cutting surface line III-III. The check valve 1 for a drain pipe of the present embodiment (hereinafter, may be simply referred to as a check valve) 1 has a valve hole 2 formed therein and discharges drainage to a step portion 3 which is a portion surrounding the valve hole 2. A valve box 5 having an annular valve seat 4 facing the downstream side in the direction A1 is formed. The valve box 5 is held in the central portion 6 and housed in the valve box 5, and the outermost peripheral portion 30 of the peripheral portion 7 is seated on the valve seat 4. And a valve element 8 for closing the valve hole 2. The valve body 8 is elastically deformed by a small amount of drainage flowing from the drain pipe 42, and the outermost peripheral portion 30 is separated from the valve seat 4.
[0013]
The valve box 5 is made of, for example, a synthetic resin, more specifically, an acrylonitrile butadiene styrene copolymer resin (abbreviation: ABS resin), is formed in a substantially hollow cylindrical shape, and has a valve passage 9 penetrating in the direction of the central axis L1. Can be drained in a discharge direction A1 from one axial end 5a toward the other axial end 5b.
[0014]
Specifically, the valve box 5 is formed so as to be continuous with the step 3 surrounding the valve hole 2 forming a part of the valve passage 9 and upstream of the step 3 in the discharge direction A1. A small-diameter right-cylindrical upstream pipe connection portion 10 that opens toward the upstream side, a large-diameter right-cylindrical valve chamber forming portion 11 that is formed continuously with the stepped portion 3 on the downstream side in the discharge direction A1, and a valve chamber formation. A fitting tubular portion 12a detachably fitted to the portion 11 and a tapered wall portion 12b which is continuous with an end of the fitting tubular portion 12a on the downstream side in the discharge direction A1 and is tapered toward the downstream side in the discharge direction A1. And a substantially cylindrical downstream pipe connection portion 12c formed continuously with the end of the tapered wall portion 12b on the downstream side in the discharge direction A1 and opened to the downstream side in the discharge direction A1.
[0015]
An annular valve seat 4 is formed on the end wall 3 of the valve box 5 in a plane that faces the valve chamber 14 and is perpendicular to the axis L1. The valve seat 4 is a valve chamber 14 surrounded by the valve chamber forming portion 11 and forms a part of the valve passage 9 and is formed facing the valve chamber 14 connected to the valve hole 2 on the downstream side in the discharge direction A1. Is done. In addition, the valve box 5 extends inward in the radial direction from four locations at equal intervals in the circumferential direction at the downstream end of the step portion 3 where the valve seat 4 is formed in the discharge direction A1 to form an annular shape. A central portion has a substantially cross-shaped support portion 16 in which a support hole 15 is formed, and the valve hole 2 divided into four parts by the support portion 16 is formed.
[0016]
The inner diameter of the upstream pipe connection part 10 is larger than the inner diameter of the step part 3, and the inner diameter of the valve chamber forming part 11 is formed larger than the inner diameter of the step part 3. The fitting cylinder portion 12a has an inner diameter larger than the valve hole 2.
[0017]
The connection pipe 12 is constituted by including the fitting cylinder 12a, the tapered section 12b, and the downstream pipe connection section 12c only by the previous processing.
[0018]
FIG. 4 is a diagram showing a configuration for connecting the drain pipes 42a and 42b to the check valve 1. The upstream-side pipe joint 70 is connected to the upstream-side pipe connection portion 12. The upstream-side pipe joint 70 is connected to a small-diameter cylindrical portion 71, one end in the axial direction of the small-diameter cylindrical portion 71, and expands radially outward. It has a first cylindrical portion 73 that is bent at a right angle from the end and extends coaxially with the small-diameter cylindrical portion 71. The small-diameter cylindrical portion 71 has an outer diameter substantially equal to the inner diameter of the upstream-side pipe connection portion 10, and the small-diameter cylindrical portion 71 can be press-fitted into the upstream-side pipe connection portion 10 to be air-tightly connected. In the large-diameter cylindrical portion 73, the downstream end 42a1 of the upstream drain pipe 42a is fitted in a liquid-tight manner. The upstream drain pipe 42a is connected to the upstream pipe connection part 10 of the check valve 1 using such an upstream pipe joint 71. Such an upstream pipe joint 70 can be realized by a mold molded product made of, for example, polyvinyl chloride.
[0019]
The downstream drain pipe 42b has an upstream end 42b1 fitted and connected to the downstream pipe connection portion 12c in an externally inserted state. A reinforcing pipe 76 made of polyvinyl chloride or the like is fitted in the other end 42b2 on the downstream side of the drain pipe 42b in an externally inserted state to prevent damage to the other end 42b. In this way, the check valve 1 is connected in a state of being interposed between the drain pipe 42a on the upstream side and the drain pipe 42b on the downstream side. In another embodiment of the present embodiment, the drain pipe 42b on the downstream side may be omitted.
[0020]
FIG. 5 is an enlarged sectional view taken along section line VV of FIG. 2, and FIG. 6 is an enlarged sectional view taken along section line VI-VI of FIG. A pair of holding pieces 78a and 78b are formed axially symmetrically in the opening 77 of the above-described valve chamber forming portion 11 at intervals in the circumferential direction. A pair of notches 79a, 79b are formed on both sides in the circumferential direction of the holding pieces 78a, 78b, respectively. Each pair of notches 79a, 79b extends parallel to the axis L1, and faces the valve chamber 14 of the fitting cylinder 12a in a state where the fitting cylinder 12a shown in FIG. It is formed up to the vicinity of the opening 80. On both sides in the circumferential direction of each of the holding pieces 78a, 78b with the notches 79a, 79b therebetween, circumferential wall portions 81a, 81b are formed symmetrically. An engaging projection 83 is integrally formed on the outer peripheral portion of the fitting cylindrical portion 12a near the tapered portion 12b over the entire circumferential direction. The engagement cylinder portion 83 has a substantially semi-cylindrical cross section cut along a virtual plane including the axis L1.
[0021]
Insertion recesses 85 are formed over the inner peripheral portions of the respective peripheral wall portions 81a and 81b so as to open from the opening ends 84 toward the downstream in the discharge direction A1. The engaging projection 83 can be movably inserted into each insertion recess 85 along the axis L1. Engaging recesses 87 into which the engaging projections 83 are fitted are formed in the inner peripheral portion of each of the holding pieces 78a and 78b from the opening end 86 toward the step portion 3 along the axis L1. An engagement portion 88 having the same inner diameter as each of the peripheral wall portions 81a and 81b is formed between the engagement recess 87 and the opening end 86, and the engagement protrusion engaged with the engagement recess 87 is formed. 83 is prevented from being extracted downstream in the discharge direction A1. Each of the holding pieces 78a and 78b can be angularly displaced outward in the radial direction around the vicinity of the base end thereof, so that the fitting cylindrical portion 12a is mounted in the valve chamber forming portion 11 so as to be so-called. It is possible to prevent the drain pipe joint 12 from being pulled out from the valve chamber forming part 11 by elastically fitting in a snap-fit state. In this way, the drain pipe joint 12 can be easily attached to or detached from the valve chamber forming portion 11, so that foreign matter is engaged between the valve body 2 and the valve seat 4, between the valve hole 2 and the like. When the valve body 8 has deteriorated due to long-term use and needs to be replaced, the valve chamber 14 can be easily opened, and the foreign matter can be easily removed or the valve body 8 can be easily replaced. .
[0022]
FIG. 7 is a front view showing the valve element 8. Referring to FIGS. 1 to 3 together, the valve body 8 is made of a material having soft elasticity, specifically, silicone rubber, and has a disc-shaped valve body 20 and a thickness direction from the center of the valve body 20. On one side, there is an engagement piece 21 protruding along the axis L2. The valve body 20 and the engagement piece 21 are formed integrally.
[0023]
The valve body 20 is inclined with respect to the plane P perpendicular to the axis L2 in one direction in the thickness direction, that is, in the direction approaching the long surface of the valve seat 4, as the peripheral portion 7 of the valve body 8 goes radially outward. The inner region 22 inside the peripheral portion 7 is formed flat along a plane P perpendicular to the axis L2. The thickness T1 of the valve body 20 is selected, for example, in the range of 0.2 to 5.0 mm, and in this embodiment, 0.5 mm. The inclination angle θ1 of the peripheral portion 7 with respect to the plane P perpendicular to the axis L2 is, for example, 14 degrees.
[0024]
The engagement piece 21 includes a cylindrical fitting portion 23 connected to the valve body 20, a substantially frustoconical locking portion 24 connected to the fitting portion 23, and a substantially cylindrical insertion guide portion connected to the locking portion 24. 25. The fitting portion 23 is formed such that the outer diameter is the same as or slightly smaller than the inner diameter of the portion facing the support hole 15 of the support portion 16 of the valve box 5 and has a dimension along the axis L2. m1 is formed to have the same size as the support portion 16 along the axis L1 or slightly larger than the size of the support portion 16 along the axis L1.
[0025]
The locking portion 24 has a truncated cone shape that tapers toward the distal end portion 26 of the locking piece 21, and the outer diameter D <b> 1 of the end portion near the valve body 20 faces the support hole 15 of the support portion 16. It is formed larger than the outer diameter, and the outer diameter D2 of the end near the distal end 26 is formed to be the same as the outer diameter of the fitting portion 23.
[0026]
The insertion guide portion 25 has a substantially cylindrical shape having an outer peripheral surface whose diameter gradually decreases toward the distal end portion 26 of the insertion guide portion 25 serving as the distal end portion of the locking piece 21. The outer diameter is formed to be the same as the outer diameter of the engaging portion 23, and the tip portion is formed in a spherical shape convex outward.
[0027]
In such a valve body 8, in a state where the valve body 20 is housed in the valve chamber 14, the engagement piece 21 is inserted into the support hole 15 from the downstream side in the discharge direction A <b> 1, and the engagement portion 23 is , Is locked by the locking portion 24 and is engaged with the support portion 16. At this time, the axes L1 and L2 form the same straight line. In this manner, the valve element 8 is supported by the support portion 16 in a state where the central portion of the valve body 20 is prevented from being displaced in the direction along the axis L2, and the so-called cantilever beam in which the peripheral portion 7 is a free end. In this state, it is provided.
[0028]
FIG. 8 is an enlarged sectional view showing the vicinity of the valve seat 4 in order to explain a seating state of the valve body 8 on the valve seat 4. As described above, the peripheral portion 7 of the valve element 8 is formed to be inclined. In a state where the peripheral portion 7 is supported by the valve box 5, the peripheral portion 7 becomes more upstream in the discharge direction A <b> 1 as it goes radially outward. It is inclined. The surface 16a (see FIG. 1) of the support portion 16 supporting the valve body 8 on the downstream side in the discharge direction A1 is formed on the same plane as the valve seat 4.
[0029]
Since the peripheral portion 7 is formed to be inclined as described above, the valve body 8 supported by the support portion 16 is formed in such a manner that the inner region 22 extends radially outward from the center in the discharge direction. In a state where the outer peripheral portion 30 of the peripheral portion 7 is elastically seated on the valve seat 4 in a state where the outer peripheral portion 30 is deformed so as to be inclined to the downstream side of A1. In other words, when the valve element 8 is supported by the valve box 5 and no external force is applied, the outermost peripheral portion 30 of the peripheral portion 7 is seated on the valve seat 4, and the valve body 8 is located on the inner side of the outermost peripheral portion 30. A portion 31 facing the valve seat 4 (hereinafter, sometimes referred to as a “valve seat facing portion”) 31 is separated from the valve seat 4. The peripheral edge portion 7 has an outermost peripheral portion 30, a valve seat facing portion 31, and a portion inside the valve seat facing portion 31.
[0030]
More specifically, in a state where no external force is applied, the outermost peripheral portion 30 is seated on the valve seat 4 in an annular region, and the valve seat opposing portion 31 on the radially inner side thereof becomes radially inward. , The distance from the valve seat 4 is increased, and between the valve seat 4 and the valve seat-facing portion 31, the dimension in the direction along each axis L 1, L 2 decreases radially outward. A space 33 having a triangular or wedge-shaped cross section in a plane including the axes L1 and L2 is formed. A radial width W2 of a region of the valve seat 4 in which the valve seat facing portion 31 faces in a state in which the valve seat facing portion 31 is spaced apart from a radial width W1 of a seating region in which the outermost peripheral portion 30 sits on the valve seat 4 is: Largely chosen. In a state where no external force is applied in this manner, the valve seat 4 extends along the axes L1 and L2 with the valve seat opposing portion 31 at an angle 35 connected to the inner peripheral surface 13 which is the radially innermost end of the valve seat 4. The interval ΔL in the direction is formed to a size such that the drainage guided to the vicinity of the space 33 is sucked into the space 33 by the capillary action as indicated by an arrow B.
[0031]
As shown in FIG. 1, a plurality of (two in the present embodiment) air vent holes 90a and 90b are formed in the vicinity of the step portion 3 of the valve chamber forming portion 11 at intervals in the circumferential direction. Release 14 to atmosphere. These air vent holes 90a and 90b have, for example, an inner diameter of about 2.0 mm, and cause a problem that the pressure in the valve chamber 14 becomes excessive and the valve body 20 of the valve body 8 is greatly deformed and cannot be seated normally. It is provided in order to prevent. Each of the air vent holes 90a and 90b is covered from the inside by a straight cylindrical inner wall 91 projecting into the valve chamber 14 from the stepped portion 3, and water flowing through between the valve body 8 and the valve seat 4 is vented by the respective air vents. Leakage to the outside from the holes 90a, 90b is prevented.
[0032]
9 is a cross-sectional view showing a mounting position of the check valve 1, and FIG. 10 is a cross-sectional view showing an arrangement state of drain pipes 42a and 42b extending from the indoor unit 41 shown in FIG. Referring to FIGS. 1 and 4 together, the check valve 1 is opened inside an upstream drain pipe 42 connected to an indoor unit 41 of an air conditioner provided in a general house 40 and inside a site drain pipe 44, for example. To the downstream drain pipe 42b. In the check valve 1, the upstream drain pipe 42 a is partially inserted and connected to the upstream pipe connection 10, and the downstream drain pipe 42 b is partially inserted and connected to the downstream pipe connection 12. And between the drain pipes 42a and 42b. In this state, the check valve 1 has the axes L1 and L2 parallel to the vertical direction such that the upstream pipe connection portion 10 is disposed above and the downstream pipe connection portion 12 is disposed below. Are arranged as follows.
[0033]
According to the check valve 1 of the present embodiment, the valve seat 4 is formed facing the downstream side in the discharge direction A1, and the peripheral portion 7 of the valve body 8 is seated on the valve seat 4 from the downstream side in the discharge direction A1 to open the valve. The valve element 8 is elastically deformed by a predetermined small amount, specifically, a small amount of dew water generated by the indoor unit 41, and the peripheral portion 7 is separated from the valve seat. Therefore, when a small amount of wastewater is guided, the wastewater can be discharged in the discharge direction A1, and even if the outside air is going to flow backward in the direction opposite to the discharge direction A1, the valve body 8 is not closed by the valve 7. It is in a state where it is pressed in the direction of sitting on the seat 4, so that backflow of the outside air can be prevented, and an unpleasant odor and an odor can be prevented. Further, even if insects and small animals try to invade in the direction opposite to the discharge direction A1, the valve body 8 is pressed in a direction in which the peripheral edge portion 7 is seated on the valve seat, so that the insects and small animals can be prevented from invading.
[0034]
In addition, the valve seat 4 is annular, and the valve body 8 is held at the center, and the peripheral portion 7 is seated on the valve seat 4 to close the valve hole 2. Even if it is arranged so as to be inclined downward, the valve body 8 is separated from the valve seat 4 by a small amount of drainage, and the drainage can be discharged, and the drainage is located upstream of the valve body 8 in the discharge direction A1. Can prevent it from accumulating.
[0035]
Therefore, by providing such a drain pipe check valve 1 between the drain pipes 42a and 42b of the indoor unit 41 of the general house 40 as described above, a small amount of drainage generated in the indoor unit 41 is discharged. It can be discharged to a place, specifically, the site drain pipe 44, and can prevent invasion of bad smell due to the backflow and invasion of outside air from the external site drain pipe 44, and can prevent insects and small animals. Intrusion can be prevented. Further, it is possible to prevent the transfer of thermal energy due to the intrusion of outside air from the site drain pipe 44, thereby improving the operation efficiency of the indoor unit 41.
[0036]
Further, according to the check valve 1 of the present embodiment, the outermost portion 30 of the peripheral portion 7 of the valve body 8 is seated on the valve seat 4 in a state where no external force is applied, and the valve body 8 is larger than the outermost portion 30. Since the portion 31 opposed to the valve seat 4 on the inner side is separated from the valve seat 4, the seating area between the valve body 8 and the valve seat 4 is reduced in a state where no external force is applied, and drainage is performed. It is easy to move outward as much as possible, so that drainage can be easily discharged, and when air is going to flow backward, it faces the valve seat 4 on the inner side of the outermost peripheral portion 30 of the valve element 8. The portion 31 is pressed toward the valve seat 4 and seats on the valve seat 4, the seating area is increased, airtightness is improved, and backflow of outside air is reliably prevented.
[0037]
Further, according to the check valve 1, the space 33 is formed between the valve seat 4 and the valve seat opposing portion 31, and the distance from the valve body 8 at the corner 35 which is the radially inner end of the valve seat 4. ΔL is formed such that the drainage can be sucked into the space 33 as indicated by the arrow B by the capillary phenomenon as described above, and only one drop of the drainage temporarily has no kinetic energy in the discharge direction A1. In this state, the waste water can be sucked into the space 33 even when guided to the vicinity of the corner 35. When the drainage is sucked into the space 33, the valve body 8 is made of a soft elastic material, so that the valve body 8 is pressed by the drainage and elastically deforms so that the outermost peripheral portion 30 is separated from the valve seat so that the peripheral edge of the valve body 8 is separated. The part 7 is displaced so as to be totally separated from the valve seat 4. In this state, the distance between the valve body 8 and the valve seat 4 at the peripheral portion 7 becomes smaller as it goes radially outward, so that the drainage is further radially outward by capillary action, specifically, the outermost peripheral portion 30. And the valve seat 4.
[0038]
In the state where the drainage is guided between the outermost peripheral portion 30 and the valve seat 4 by the capillary phenomenon, when the pressure of the outside air to be back-flowed acts on the valve body 8, the drainage hits the valve seat 4 via the drainage. The inner region portion 22 on the radially inner side than the contacting peripheral portion 7 is deformed so as to be located on the upstream side in the discharge direction A1, and the valve body 8 is further pressed, from the state shown by the phantom line 70 in FIG. It comes into contact with the valve seat 4 gradually from the radially inner side. As described above, when drainage is held between the valve body 8 and the valve seat 4, when the outside air is pressed in a direction opposite to the discharge direction A1 to flow backward, the valve body 8 is moved from the radially inner side to the valve seat 4. Since the seat is seated, the drainage guided between the valve body 8 and the valve seat 4 is pushed outward in the radial direction. In this way, even a very small amount of waste water of one drop can be discharged using the air that is about to flow backward, and after the waste water is discharged, the outermost peripheral portion 30 and the valve seat facing portion 31 are removed. Sit on the valve seat 4.
[0049]
Each of the above embodiments is merely an example of the present invention, and can be modified within the scope of the present invention. As another embodiment, for example, the support portion 16 of the valve box 5 is replaced with a cross shape. And Figure 11As shown in the plan view of the check valve 1E of FIG.2Radial to three directions shown in the plan view of the check valve F of FIG.3The shape, material, and the like of the valve box 5 and the valve body 8 may be changed, for example, by forming the check valve 1G into a radial line shape as shown in the plan view of FIG.
[0050]
Further, still another embodiment is a specific mounting position in which each check valve1Although the structure provided in the drain pipes 42a and 42b for discharging the waste water generated by the indoor air conditioner 40 has been described, it may be provided in the drain pipe for discharging the waste water generated in the refrigerator 60 as shown in FIG. Alternatively, a drain pipe 42c for discharging waste water generated in an air conditioner and a vending machine in a car may be provided. Each check valve of the present invention1 isThe remarkable effect can be exhibited by providing the drain pipe of the device that generates a small amount of drainage as described above.
[0051]
【The invention's effect】
According to the present invention, the valve box includes:A valve passage having a valve hole and a valve chamber and through which drainage can flow from an opening at one axial end to an opening at the other axial end is formed, and a valve seat is formed around the valve hole. Have been.valve seatIs in the valve roomFormed facing downstream in the discharge directioning.A valve body made of a material having soft elasticity is held at the center of the valve box. The valve body is formed so as to be inclined in a direction approaching the valve seat as the peripheral portion becomes radially outward, and the peripheral portion is opposed to the outermost peripheral portion and the valve seat on the radially inner side of the outermost peripheral portion. The outermost portion and the valve seat facing portion face the valve seat. With such a valve body, the outermost peripheral portion is seated on the valve seat from the downstream side in the discharge direction over the entire circumference in a state where the valve seat opposing portion is separated from the valve seat, and the valve hole is closed.
In this valve body, at least a part of the outermost peripheral portion of the peripheral portion is elastically deformed by a small amount of drainage flowing into the valve hole from the drain pipe and separated from the valve seat, and the drainage passes through the drainage downstream. Allowably, it can be discharged from the valve hole to the valve chamber side. In addition, the valve body is formed such that the peripheral edge portion is inclined, and only the outermost peripheral portion is seated on the valve seat in a state where the valve seat facing portion is separated from the valve seat. Therefore, the seating area of the valve body with respect to the valve seat can be made as small as possible, and preferably, a line contact state or a narrow surface contact state close thereto can be achieved. In this way, the seating area is reduced so that the drainage can be moved outward as much as possible, and since the valve body is made of a material having soft elasticity, even a small amount of drainage can be easily deformed. Even the wastewater can be deformed and discharged.
Also, when the outside air tries to flow backward in the drain pipe in the direction opposite to the discharge direction, the entire periphery of the peripheral portion is pressed in a direction pressed against the valve seat, and the valve seat opposing portion is seated on the valve seat. Enlarge the area to increase airtightness. Further, as the pressure of the backflowing outside air is higher, the pressing pressure against the valve seat at the peripheral portion becomes stronger, and the valve body can reliably prevent the backflow of the outside air. In this way, the valve element can reliably discharge a small amount of drainage, and can reliably prevent the reverse flow of outside air.
Further, even if insects and small animals try to invade in the direction opposite to the discharge direction, the outermost peripheral portion of the valve body is seated on the valve seat, so that the insects and small animals may not move between the valve body peripheral edge and the valve seat. There is no gap that can be interrupted, which can reliably prevent insects and small animals from entering the valve hole from the valve chamber.
Further, a hole for opening the valve chamber to the atmosphere is formed in the valve box separately from the openings at both ends in the axial direction. This can prevent the pressure in the valve chamber from becoming excessive when air is going to flow backward. Therefore, it is possible to prevent the valve body from being pressed by the air that is going to flow backward and being deformed significantly. In this way, it is possible to prevent a problem that the valve body does not normally seat on the valve seat. Further, the valve box has an inner wall that protrudes from the portion where the valve seat is formed into the valve chamber outside the valve seat and covers the air vent hole from the inside. This prevents the waste water from leaking out of the air vent hole when the waste water is discharged. Therefore, it is possible to prevent the leakage of the drainage and to prevent the valve chamber from being excessively pressurized.
[0052]
Also, since the valve body is held at the center and the peripheral edge is seated on the valve seat, a small amount of drainage can be placed in the valve seat at the bottom of the peripheral edge regardless of the orientation of the valve body. The small amount of drainage is discharged to the valve chamber side by pushing open in a direction away from the small valve, and high responsiveness to the small amount of drainage can be achieved.
[0053]
Therefore, such a check valve for a drain pipe is provided at an arbitrary position such as an intermediate unit and an outlet end of a drain pipe of an indoor unit of an air conditioner of a general house, an air conditioner of a vehicle, a refrigerator and a vending machine. As a result, a small amount of wastewater generated by these devices can be reliably discharged, and in addition, the invasion of bad smell into the room due to the backflow of outside air and the invasion of insects and small animals can be reliably prevented. Furthermore, it is possible to prevent the transfer of heat energy due to the intrusion of the outside air, that is, the removal of cold and warm heat, and thereby it is possible to improve the operation efficiency of each device.
[0054]
According to the present invention, since the valve element has the flat inner region portion, the valve element can be held in the valve box at the center, and the valve element can be provided so that only the outermost peripheral portion is seated on the valve seat. .
Further, even if the pressure on the valve chamber side becomes higher than the pressure on the valve hole side due to backflow of the outside air, the peripheral portion of the valve body is formed to be inclined as described above. The contact pressure and the contact area change in a direction to increase, and the reliability and reliability of blocking the outside air are further improved.
[0055]
BookAccording to the invention, the valve seat opposing portion of the valve element is separated from the valve seat with a space between the valve seat opposing portion and the valve seat so that drainage can be sucked by capillary action. Thus, even if only one drop of drainage is guided without kinetic energy in the discharge direction, the drainage can be sucked between the valve seat-facing portion and the valve seat. When the drainage is sucked in this way, the valve body is made of a material having soft elasticity, so that the valve body is elastically deformed by being pressed by the drainage, so that the entire peripheral portion is separated from the valve seat so that the outermost peripheral portion is separated from the valve seat. Deforms so as to separate from the valve seat. In this state, the distance from the valve seat at the peripheral edge becomes smaller as it goes radially outward, so that the drainage is further radially outward by capillary action, specifically, the outermost peripheral portion and the valve seat. Guided between.
In the state where the drainage is guided between the outermost peripheral portion and the valve seat by the capillary action, when the pressure of the outside air to be back-flowed acts on the valve body, the peripheral edge which is in contact with the valve seat via the drainage. The inner region portion on the radially inner side than the portion is deformed so as to be located on the upstream side in the discharge direction, the valve body is further pressed, and the valve is gradually seated on the valve seat from the radially inner side. In this way, when the drain is held between the valve body and the valve seat, when the outside air is pressed in a direction opposite to the discharge direction in an attempt to flow backward, the valve body is seated on the valve seat from the radially inner side, The drainage guided between the valve body and the valve seat is pushed radially outward. In this manner, even a very small amount of wastewater of one drop can be discharged using the air that is about to flow backward, and after the wastewater is discharged, the outermost peripheral portion and the portion facing the valve seat are valve seats. To sit and close the valve hole.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a check valve 1 for a drain pipe according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along section line II-II in FIG.
FIG. 3 is a cross-sectional view taken along line III-III in FIG. 1;
FIG. 4 is a view showing a configuration for connecting drain pipes 42a and 42b to the check valve 1.
FIG. 5 is an enlarged cross-sectional view taken along the line VV of FIG. 2;
FIG. 6 is an enlarged sectional view taken along the line VI-VI of FIG. 2;
FIG. 7 is a front view showing the valve element 8;
FIG. 8 is an enlarged sectional view showing the vicinity of the valve seat 4;
FIG. 9 is a sectional view showing a mounting position of the check valve for drain pipe 1.
FIG. 10 is a cross-sectional view showing a state where drain pipes a and b extending from the indoor unit 41 shown in FIG.
FIG.1FIG. 10 is a plan view of a check valve 1E according to another embodiment of the present invention.
FIG.2FIG. 10 is a plan view of a check valve 1F according to another embodiment of the present invention.
FIG.3FIG. 10 is a plan view of a check valve 1G according to another embodiment of the present invention.
[Explanation of symbols]
1,1E〜1G Check valve for drain pipe
2 Valve hole
3 Valve hole forming part
4 Valve seat
5 Valve box
6 center
7 Perimeter
8 valve body
20 valve body
21 Engagement part
30 Outermost part
31 Valve seat facing part

Claims (3)

(A) A valve box to which a drain pipe is connected and which is arranged so that an axis is parallel to a vertical direction ,
(A1) It has a valve hole and a valve chamber on the downstream side in the discharge direction of drainage flowing into the drain hole from the drain pipe , and is disposed below the opening at one axial end disposed on the upper side. A valve passage through which drainage can flow downward from above is formed toward the opening at the other axial end ,
(A2) seen extraordinary in valve chamber, and a valve hole in a portion outer circumference, an annular valve seat is formed,
(A3) In addition to the openings at both ends in the axial direction, holes for opening the valve chamber to the atmosphere are formed,
(A4) from the portion where the valve seat is formed, a valve box inner wall Ru is formed to cover projecting into the valve chamber outside the valve seat, the air vent hole from the inside,
(B) a valve body made of a material having soft elasticity, a center portion of which is held by a valve box, and which is formed so as to be inclined in a direction approaching a valve seat as a peripheral portion becomes radially outward,
(B1) the peripheral portion has an outermost peripheral portion and a valve seat-facing portion on the radially inner side of the outermost peripheral portion;
(B2) the outermost peripheral portion and the valve seat facing portion are provided to face the valve seat;
(B3) in a state where the valve seat opposing portion is separated from the valve seat, the outermost peripheral portion is seated on the valve seat over the entire circumferential direction to close the valve hole;
(B4) at least a part of the outermost peripheral portion is separated from the valve seat by the attachment of the drainage to open a valve hole;
(B5) A check valve for a drain pipe, characterized in that the valve seat opposing portion includes a valve element seated on the valve seat when air is to flow backward from the downstream side in the drainage discharge direction. 2. The check valve for a drain pipe according to claim 1, wherein the valve body has an inner region formed in a flat shape on a radially inner side of a peripheral edge portion. 3. The valve seat-facing portion is separated from the valve seat with a space between the valve seat-facing portion and the valve seat that can suck drainage by capillary action ,
When the air is going to flow backward from the discharge direction downstream side of the drainage, the inside area part radially inward of the peripheral edge is deformed so as to be located on the upstream side in the discharge direction, and the valve seat gradually decreases from the radial direction inside. drain pipe check valve of claim 1, wherein that you sit in.

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