WO2024178784A1 - Rotary damping mechanism - Google Patents

Abstract

A rotary damping mechanism, comprising: a shaft sleeve (1) having a shaft cavity (10) filled with damping oil, a rotating shaft (2) having an inner shaft section (20) in sealed rotational fit with the shaft cavity (10), and a gland (5) for sealing the opening of the shaft sleeve (1). The rotary damping mechanism further comprises: a piston (3) which is non-rotatably mounted inside the shaft cavity (10) and fitted with the rotating shaft (2), wherein the fit clearance between the piston (3) and a wall of the shaft cavity (10) forms an outer oil passage (3a) of the piston (3), and the fit clearance between a threaded hole (301) of the piston (3) and an external threaded shaft section (21) of the inner shaft section (20) forms an inner oil passage (3b) of the piston (3); the end of the piston (3) close to an outer shaft section of the rotating shaft (2) is provided with a piston ring (4) capable of moving in the axial direction of the piston (3), the piston ring (4) being fitted with the piston (3) and the wall of the shaft cavity (10) to form a check valve (Q) for opening and closing the outer oil passage (3a), and an internal bore (302) of the piston (3) being fitted with a gradient circular shaft section (22) of the inner shaft section (20) to form an opening valve (Z) for opening and closing the inner oil passage (3b); and when the rotating shaft (2) actuates the piston (3) to move to close both the check valve (Q) and the opening valve (Z), the damping oil slowly seeps through the outer oil passage (3a) and/or the inner oil passage (3b), such that the oil pressure difference between two ends of the piston (3) in the shaft cavity (10) slowly decays, and by means of the decaying oil pressure, the piston (3) is braked to move slowly, causing the rotating shaft (2) to rotate slowly.

Description

A rotary damping mechanism Technical Field

The invention relates to a toilet cover assembly, in particular to a rotary damping mechanism.

Background Art

The basic principle of the slow-fall damping of the toilet seat cover is hydraulic slow-fall, which is achieved by setting a buffer blade inside the sleeve, and using the buffer blade to carry a one-way valve mechanism to rotate inside the sleeve to generate hydraulic torque output.

Technical issues

In the prior art, blade-type dampers are still mostly used. Blade-type dampers use radial oil stirring. Due to the radial oil stirring, the gaps between the blades are large, resulting in a large amount of damping oil to be filled. When activated, the strong oil pressure will cause the shaft to become relatively fragile. It may have a slight advantage in application to light cover plates and medium cover plates, but when applied to heavy cover plates, the small diameter shaft is difficult to withstand. Long-term use or thermal expansion and contraction with seasonal changes are prone to dimensional changes, thereby affecting the damping effect.

For example, the existing Chinese patent number is: CN207253296U, and the patent name is: A slow-descent damper for a toilet cover, including a sleeve that can be filled with damping oil, a rotating shaft that rotates with the sleeve and disturbs the flow of damping oil, and two one-way valve plates. The inner cavity wall of the sleeve has relatively longitudinally arranged oil-isolating ribs, the rotating shaft includes a shaft core and two rotors arranged opposite to the shaft core, and a symmetrical radial gradient arc surface is formed between the two rotors. A one-way valve plate is respectively sleeved on the two rotors of the rotating shaft and slides with the inner cavity wall of the sleeve. There are symmetrically arranged overrunning ribs between the two oil-isolating ribs on the bottom surface of the inner cavity of the sleeve and on the end surface where the rotating shaft and the sleeve cooperate. The oil groove, the lower end of the shaft core and the center of the bottom of the shaft sleeve inner cavity rotate together, and the two rotors on the shaft core have good integrity, which can simplify the structural features of the shaft and reduce the difficulty of shaft processing. The one-way valve plate swings relative to the rotor of the shaft, and the shaft has strong pressure-bearing strength. However, it has high requirements on the size of the entire shaft sleeve inner cavity wall and the one-way valve, and the allowable tolerance in size is small. Precision deviation during processing or deformation of the cavity after long-term use will cause the tolerance to become larger. Once the tolerance is too large, the oil return speed is likely to be slow, and the entire cover plate is stuck in the middle, or the oil return speed is too fast, and the entire cover plate flips down quickly and makes noise.

Technical Solutions

The present invention provides a rotary damping mechanism which can effectively solve the above problems.

The present invention is achieved in that:

A rotary damping mechanism comprises: a shaft sleeve whose shaft cavity is filled with damping oil, a rotating shaft whose inner shaft section is sealed and rotatably matched with the shaft cavity, a gland for sealing the opening of the shaft sleeve, and further comprising:

A piston is mounted in the shaft cavity and matched with the rotating shaft, the piston includes a center hole opened in the axial direction, the center hole is composed of a threaded hole and an inner circular hole, the inner shaft section includes an outer screw shaft section and a gradient circular shaft section, the outer screw shaft section is threaded in the threaded hole so that the rotating shaft can actuate the piston to axially reciprocate in the shaft cavity to deflect and compress the damping oil;

The space between the piston and the shaft cavity wall forms the outer oil passage of the piston, and the gap between the threaded hole and the outer screw shaft section forms the inner oil passage of the piston;

A plug ring is installed on the end of the piston close to the outer shaft section of the rotating shaft and can move in the axial direction thereof. The plug ring cooperates with the piston and the shaft cavity wall to form a one-way valve for opening and closing the outer oil passage, and the inner circular hole cooperates with the gradient circular shaft section to form an opening valve for opening and closing the inner oil passage;

When the shaft actuating piston moves to the point where both the one-way valve and the opening valve are closed, the damping oil seeps through the outer oil channel and/or the inner oil channel and slowly passes through, the oil pressure difference at both ends of the piston in the shaft cavity slowly decays, and the decayed oil pressure brake piston slowly moves to cause the shaft to slowly rotate.

As a further improvement, the piston includes a cylindrical plug body that moves axially inwardly of the shaft cavity, and a convex edge extending from the end of the cylindrical plug body toward the outer shaft section of the rotating shaft, and the plug ring reciprocates between the outer ring surface of the cylindrical plug body on the side close to the outer shaft section of the rotating shaft and the convex edge.

As a further improvement, the cylindrical plug body includes a plurality of guide grooves opened in the radial direction, and a plurality of guide ribs corresponding to the guide grooves are fixedly connected to the inner wall of the shaft cavity. The guide groove is open at one end close to the inner circular hole and closed at one end away from the inner circular hole.

As a further improvement, the cylindrical plug body also includes a plurality of external oil passages opened in the radial direction, the external oil passages and the guide grooves are arranged alternately at intervals, and both ends of the external oil passages are open. When the plug ring is pressed against the external oil opening of the external oil passage, the external oil passage is closed and the damping oil flows into the external screw shaft section; when the plug ring is away from the external oil opening of the external oil passage, the external oil passage is opened and the damping oil moves along the external oil passage toward the side close to the pressure cover.

As a further improvement, a strain gap is provided in the radial direction of the plug ring, and the strain gap provides a strain space for radial expansion or contraction of the plug ring.

As a further improvement, the plug ring includes a circular ring which is sleeved between the cylindrical plug body and the convex edge, the circular ring includes a plurality of limiting protrusions which are arranged on its inner ring surface and are evenly distributed at equal intervals, an oil-passing recess is provided in the gap between the limiting protrusions, the limiting protrusions correspond to the positions of the external oil-passing ports, and the limiting protrusions abut against the external oil-passing ports or the convex edge as the plug ring moves.

As a further improvement, a side of the circular ring close to the gland is connected with a conical expansion ring surface, and the strain gap is subjected to the damping oil pressure, which causes the conical expansion ring surface to expand in diameter and abut against the inner wall of the shaft cavity.

As a further improvement, the side of the circular ring away from the pressure cover is connected to a shrink ring cone surface, and the damping oil entering from the external oil port will compress the shrink ring cone surface inward, so that the strain gap is compressed and separated from the inner wall of the shaft cavity, allowing the damping oil to pass quickly.

As a further improvement, the gradient circular shaft segment includes a closed diameter, a gradual diameter, and an open diameter connected in sequence from the extension direction of the outer screw shaft segment. When the piston moves in the direction close to the pressure cover, the open diameter, the gradual diameter, and the closed diameter cooperate with the inner circular hole in sequence.

As a further improvement, the gradient circular shaft segment is a mating shaft connected to the external screw shaft segment, the mating shaft has equal diameters at the head and tail, and the mating shaft includes a large diameter portion connected to the external screw shaft segment, a gradient groove arranged in the direction away from the pressure cover on the large diameter portion and with a gradually increasing groove width, and a small diameter groove connected to the gradient groove and with a groove width less than or equal to the diameter length of the end section of the gradient groove.

Beneficial Effects

The beneficial effects of the present invention are as follows: the present invention changes the blade-type rotating shaft commonly used in the industry and introduces a brand-new threaded rotating shaft. The torque that the rotating shaft can bear is increased by matching the spiral rotating shaft with the piston with the threaded hole. The threaded matching has a small internal space and a reduced amount of damping oil. Even when applied to a heavy cover plate, the present invention can withstand a large torque and is not prone to deformation and tolerance after long-term use.

Afterwards, through the cooperation of the one-way valve composed of the plug ring and the piston, and the opening valve composed of the piston and the gradient circular shaft segment, the plug ring can be retracted inwards when opening the cover plate to realize smooth opening of the cover, and the plug ring can be expanded outwards to resist the shaft cavity of the shaft sleeve when closing the cover plate, and the damping oil flows back through the internal space of the piston. With the gradual change of the opening valve, the effect of rapid descent in the early stage, deceleration in the middle stage, and steady descent in the late stage is achieved, and the closing speed of the cover plate can be improved while the cover plate can be slowly lowered;

And because of the one-way valve composed of the plug ring and the piston, the plug ring will expand outwards and abut against the shaft cavity after closing the external oil channel. The outward expansion action of the plug ring can compensate for the inner diameter tolerance of the shaft cavity. Even if the shaft cavity is deformed during the processing stage or after long-term use and has dimensional tolerance errors, it can be compensated by the outward expansion of the plug ring. The accuracy requirements for the shaft cavity are not high, and the requirements for both factory requirements and use environment are reduced, which is easy to promote.

When the one-way valve and the opening valve close the inner and outer oil passages, the hydraulic damping decays to cause the piston to move slowly toward the pressure cover, that is, the piston moves toward the cover plate support point, so that the cover plate is not prone to shaking when it slowly falls.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of the three-dimensional structure of a rotary damping mechanism provided by the present invention.

FIG. 2 is an exploded view (first perspective) of a rotary damping mechanism provided by the present invention.

FIG. 3 is an exploded view (second viewing angle) of a rotary damping mechanism provided by the present invention.

FIG. 4 is a schematic structural diagram of a plug ring provided by the present invention.

FIG. 5 is a schematic structural diagram of a piston provided by the present invention.

FIG. 6 is a schematic structural diagram of a rotating shaft provided by the present invention.

FIG. 7 is a front view schematic diagram of the structure of a rotary damping mechanism provided by the present invention.

Fig. 8 is a cross-sectional view taken along line A-A in Fig. 7 of the present invention.

Fig. 9 is a cross-sectional view of the B-B portion in Fig. 7 of the present invention.

Fig. 10 is a cross-sectional view at C-C in Fig. 9 of the present invention (the cover plate falling state, the opening diameter and the inner circular hole matching stage).

Fig. 11 is a cross-sectional view at C-C in Fig. 9 of the present invention (the cover plate falling state, the gradual diameter and the inner circular hole matching stage).

Fig. 12 is a cross-sectional view at C-C in Fig. 9 of the present invention (the cover plate falling state, the closing diameter and the inner circular hole matching stage).

Fig. 13 is a cross-sectional view of the C-C portion in Fig. 9 of the present invention (cover open state).

FIG. 14 is a cross-sectional view of a rotating shaft provided by another embodiment of the present invention.

Reference numerals:

Shaft sleeve-1; shaft cavity-10; guide rib-101;

Rotating shaft-2; inner shaft section-20; outer screw shaft section-21; gradient circular shaft section-22;

Closing diameter - 221; Gradual diameter - 222; Opening diameter - 223;

Large diameter portion-227; Gradient groove-228; Small diameter groove-229;

Piston-3; center hole-30; threaded hole-301; inner hole-302;

Column plug body-31; guide groove-311; convex edge-32;

External oil passage-3a; External oil port-3a1; Internal oil passage-3b;

Plug ring-4; strain gap-40; circular ring-41; limiting protrusion-411;

Oil-passing concave portion-412; expansion ring conical surface-42; contraction ring conical surface-43;

Gland-5; end cover-51; gasket-52; sealing ring-53;

Check valve-Q; opening valve-Z.

Embodiments of the present invention

In order to make the embodiments of the present invention, all belong to the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

In the description of the present invention, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as referring to the purpose, technical solutions and advantages of the methods. To be more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work indicate or imply relative importance or implicitly indicate the number of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

Referring to Figures 1-14, a rotary damping mechanism comprises: a shaft sleeve 1 whose shaft cavity 10 is filled with damping oil, a shaft 2 whose inner shaft section 20 is sealed and rotated with the shaft cavity 10, a gland 5 that seals the opening of the shaft sleeve 1, and also comprises: a piston 3 that is mounted in the shaft cavity 10 and cooperates with the shaft 2, the piston 3 comprises a center hole 30 opened in the axial direction, the center hole 30 is composed of a threaded hole 301 and an inner circular hole 302, the inner shaft section 20 comprises an outer screw shaft section 21 and a gradient circular shaft section 22, the outer screw shaft section 21 is screwed in the threaded hole 301 so that the shaft 2 can actuate the piston 3 to axially reciprocate in the shaft cavity 10 to compress the damping oil;

As shown in Figures 7 to 12, the interval between the piston 3 and the wall of the shaft cavity 10 forms the outer oil passage 3a of the piston 3, and the gap between the threaded hole 301 and the outer threaded shaft segment 21 forms the inner oil passage 3b of the piston 3; a plug ring 4 that can move in the axial direction of the piston 3 is installed on the end of the piston 3 close to the outer shaft segment of the rotating shaft 2, and the plug ring 4 cooperates with the piston 3 and the wall of the shaft cavity 10 to form a one-way valve Q for switching the outer oil passage 3a, and the inner circular hole 302 cooperates with the gradient circular shaft segment 22 to form an opening valve Z for switching the inner oil passage 3b; when the rotating shaft 2 actuates the piston 3 to move to the point where the one-way valve Q and the opening valve Z are both closed, the damping oil seeps slowly through the outer oil passage 3a and/or the inner oil passage 3b, and the oil pressure difference at both ends of the piston 3 in the shaft cavity 10 slowly decays, and the decayed oil pressure brakes the piston 3 slowly to cause the rotating shaft 2 to rotate slowly.

1, 7 and 8, in the application of slow-fall damping, damping oil needs to be filled in the sleeve 1. In order to avoid leakage of the damping oil, a gland 5 needs to be welded on the sleeve 1, so that oil leakage does not occur during the cooperation between the rotating shaft 2 and the sleeve 1 and the internal structure. In the sealing of the gland, since there is still air inside the sleeve when the gland is pressed in, if welding is performed directly, noise will be emitted from the sleeve when the rotating shaft rotates. Therefore, the gland 5 in this embodiment includes an end cover 51, a gasket 52, The sealing ring 53 is on the outside of the rotating shaft 2, the gasket 52 is padded on the rotating shaft 2, the sealing ring 53 is sleeved on the rotating shaft 2, the end cover 51 is pressed into the sleeve 1 and the sealing ring 53 and the rotating shaft 2 to form a seal, the air in the shaft cavity 10 is discharged from the gap between the inner wall of the sleeve 1 and the annular wall of the end cover 51, and then the end cover 51 and the sleeve 1 are welded and sealed and fixed by wave soldering, so that the inner shaft section 20 on the rotating shaft 2 can be sealed in the shaft cavity 10 filled with damping oil, and at the same time the air inside the shaft cavity 10 is completely discharged, and there is no noise when it is activated.

Referring to Figures 2-3 and 8, the rotating shaft 2 does not move in the axial direction during the whole process, but only rotates in the radial direction. The rotating shaft 2 includes an external conventional shaft handle section and an inner shaft section 20, wherein the shaft handle section cooperates with the cover plate or the seat ring to achieve slow descent, and the inner shaft section 20 does not adopt the existing blade type structure, but adopts a spiral design. The inner shaft section 20 is divided into an outer screw shaft section 21 and a gradient circular shaft section 22 that cooperate with the piston 3. The outer screw shaft section 21 cooperates with the piston 3 to enhance the coordination effect between the rotating shaft 2 and the piston 3. Compared with the method of radially stirring the damping oil by blades, this embodiment adopts the method of axially stirring the damping oil by the piston 3 in the sleeve 1, so that the torque of the rotating shaft 2 is stronger, and both light cover plates and heavy cover plates can be stably loaded.

The movement mode of the piston 3 matched with the rotating shaft 2 is different from that of the rotating shaft 2. The piston 3 only moves in the axial direction and does not rotate in the sleeve 1. A center hole 30 is opened in the axial direction of the piston 3. The center hole 30 includes a threaded hole 301 matched with the external screw shaft segment 21. The threaded hole 301 cooperates with the external screw shaft segment 21 so that the entire piston 3 moves axially when the external screw shaft segment 21 rotates. The center hole 30 also includes an inner circular hole 302. The inner circular hole 302 is directly connected to the shaft cavity 10 in the sleeve 1, and can serve as a channel to allow the damping oil to flow back to the original position when the oil return process occurs.

2-3 and 8 , a plug ring 4 is also sleeved on the piston 3, and the plug ring 4 changes its position with the movement of the damping oil and the piston 3;

There are two oil passages in the entire damping mechanism, one is the oil inlet passage, and the other is the oil return passage. The oil inlet passage is the outer oil passage 3a formed by the gap between the piston 3 and the wall of the shaft cavity 10, while the oil return passage is the inner oil passage 3b formed by the gap between the threaded hole 301 and the outer screw shaft section 21.

When the user needs to lift the cover plate, the damping oil moves toward the direction of the gland 5 through the external oil passage 3a, and the gradually introduced damping oil pushes the piston 3 to the side away from the gland 5. At the same time, the damping oil applies pressure to the outer ring surface of the plug ring 4, presses the plug ring 4 inward, and the one-way valve Q formed by the plug ring 4, the piston 3, and the wall of the shaft cavity 10 opens to quickly pass the oil. No oil pressure difference is generated at both ends of the piston 3. The piston 3 has no damping oil pressure, so the shaft 2 can quickly drive the piston 3 to move axially, that is, the shaft 2 can rotate quickly, and the user can easily lift the cover plate. When the cover plate is lifted too quickly, the damping oil has no time to pass through the plug ring 4. The rapid damping oil will squeeze the outer ring surface of the plug ring 4, causing the plug ring 4 to shrink and form a gap with the wall of the shaft cavity 10 to allow the damping oil to pass quickly.

When the user lowers the cover plate, the damping oil wants to flow back through the outer oil passage 3a. However, in this process, the damping oil will first push the plug ring 4 toward the piston 3, and the plug ring 4 will block the outer oil passage 3a of the piston 3, that is, the one-way valve Q is closed, and the outer oil passage 3a is blocked. At the same time, since the damping oil cannot flow back from the outer oil passage 3a, the continuously introduced damping oil will increase in pressure, which will expand the plug ring 4 outward, and the rotating shaft 2 and the piston 3 can no longer move relative to each other, so that the damping oil can only flow back through the inner oil passage 3b. Once the damping oil flows back, the pressure of the plug ring 4 gradually decreases, the shaft 2 and the piston 3 resume their motion state, and the cover plate falls under the action of gravity. With the cooperation between the gradient circular shaft section 22 of the shaft 2 and the inner circular hole 302, the opening of the opening valve Z gradually becomes smaller. During the movement of the piston 3, the opening valve Z has a throttling effect, which changes the oil pressure at both ends of the piston 3, and the cover plate can be turned down quickly at the initial speed, then slowed down, until it finally falls at a uniform speed, thereby completing the uniform and silent cover plate slow fall.

2, 3, 5 and 8, the piston 3 is divided into two major parts in terms of overall structure. One part is a cylindrical plug body 31, and the inner and outer ring surfaces of the cylindrical plug body 31 are provided with different matching structures. The other part is a convex edge 32, and the convex edge 32 is used to limit the plug ring 4. The specific position relationship is as follows: the piston 3 includes a cylindrical plug body 31 that moves axially inwardly of the shaft cavity 10, and a convex edge 32 extending from the cylindrical plug body 31 toward the end of the outer shaft section of the rotating shaft 2. The plug ring 4 reciprocates between the outer ring surface of the cylindrical plug body 31 on the side of the outer shaft section of the rotating shaft 2 and the convex edge 32. A neck is formed between the convex edge 32 and the outer ring surface of the cylindrical plug body 31. The plug ring 4 moves in the neck. When the plug ring 4 moves to the cylindrical plug body 31, the outer oil passage 3a will be closed. When the plug ring 4 moves to the convex edge 32, the damping oil will flow through the outer oil passage 3a to the side of the pressure cover 5.

As mentioned above, only axial movement occurs between the piston 3 and the axial cavity 10 of the sleeve 1, and radial rotation cannot occur because the cylindrical plug body 31 includes a plurality of guide grooves 311 opened in the radial direction, and a plurality of guide ribs 101 corresponding to the guide grooves 311 are fixedly connected to the inner wall of the axial cavity 10, and the guide grooves 311 are open at one end close to the inner hole 302, and closed at the other end away from the inner hole 302, wherein the maximum movement stroke of the cylindrical plug body 31 is the length of the guide rib 101, that is, the guide groove 311 will not be disengaged from the guide rib 101 after the cylindrical plug body 31 moves the longest distance, so as to facilitate its resetting, and in order to prevent the damping oil from flowing out of the guide groove 311, one end of the guide groove 311 can only be in a closed state, and only the side cooperating with the guide rib 101 is open.

As shown in FIG5 , the cylindrical plug body 31 further includes a plurality of outer oil passages 3a opened in the radial direction, the outer oil passages 3a and the guide grooves 311 are arranged alternately at intervals, and both ends of the outer oil passages 3a are open. As shown in FIGS. 10 to 12 , when the plug ring 4 is pressed against the outer oil port 3a1 of the outer oil passage 3a, the outer oil passage 3a is closed and the damping oil flows into the outer screw shaft section 21; as shown in FIG13 , when the plug ring 4 is away from the outer oil port 3a1 of the outer oil passage 3a, the outer oil passage 3a is opened and the damping oil flows along the outer oil passage 3a toward the gland 5. In order to facilitate the rapid circulation of damping oil, more than one external oil passage 3a is provided, and the external oil passage 3a and the inner wall of the shaft cavity 10 form a sealed flow channel. The end of the external oil passage 3a opening away from the pressure cover 5 is communicated with the damping oil accommodating chamber formed by the inner circular hole 302 and the shaft cavity 10, and the other end close to the pressure cover 5 is communicated with the one-way valve Q, so that the damping oil can flow from the damping oil accommodating chamber to the one-way valve Q, so that the two ends of the piston 3 will not be closed in the shaft cavity 10 of the shaft sleeve 1 and an oil pressure difference will not be generated, that is, the damping oil has no hydraulic damping effect on the piston 3, so that the rotating shaft 2 can drive the piston 3 to rotate rapidly.

4 and 10 to 12, when the plug ring 4 is pressed against the outer oil passage 3a1, the damping oil cannot flow back into the outer oil passage 3a, so the area where the damping oil is located is a high-pressure area. Although the damping oil cannot flow in in large quantities due to the sealing of the outer oil passage 3a1, the damping oil can still flow in through the gap between the plug ring 4 and the shaft cavity 10, and the pressure in the high-pressure area continues to rise. Since a strain gap 40 is provided in the radial direction of the plug ring 4, the damping oil in the high-pressure area will be pressed into the strain gap 40, making the strain gap 40 larger and forming pressure on the plug ring 4. After the plug ring 4 is pressurized, the strain gap 40 will expand so that the plug ring 4 is pressed against the inner wall of the shaft cavity 10, thereby completely isolating the low-pressure area from the high-pressure area, and the damping oil can only flow back through the inner oil passage 3b to relieve pressure. At the same time, the strain gap 40 can also facilitate the entire plug ring 4 to be embedded in the neck of the piston 3, which is convenient for installation.

4 and 13, the plug ring 4 must ensure that it can close the outer oil passage 3a when it is in contact with the cylindrical plug body 31, and at the same time, it does not affect the flow of damping oil to the high-pressure area when it is in contact with the convex edge 32. The plug ring 4 includes a circular ring 41 that is sleeved between the cylindrical plug body 31 and the convex edge 32. The circular ring 41 includes a plurality of limiting protrusions 411 that are arranged on its inner annular surface and are evenly distributed at equal distances, and an oil-passing concave portion 412 is provided in the gap between the limiting protrusions 411 and the limiting protrusions 411. The limiting protrusion 411 corresponds to the position of the outer oil passage 3a1. The limiting protrusion 411 abuts against the outer oil passage 3a1 or the convex edge 32 as the plug ring 4 moves. The limiting protrusion 411 can close the outer oil passage 3a when it is in contact with the cylindrical plug body 31. When it is in contact with the convex edge 32, since it has a certain thickness, a certain gap is still left after abutting against the convex edge 32. Therefore, the damping oil can flow toward the side of the pressure cover 5 through the oil passage recess 412, and will not accumulate at the neck of the plug ring 4.

4 and 10 to 12, when the pressure in the high-pressure zone increases, the circular ring 41 will expand outward. If it is a simple circular ring structure, a large pressure is required for the expansion, which can easily damage the structure of the entire sleeve 1. Therefore, a consistent expansion ring cone 42 is connected to the side of the circular ring 41 close to the gland 5. After the strain gap 40 is subjected to the damping oil pressure, the expansion ring cone 42 will be expanded and abutted against the inner wall of the shaft cavity 10. Through the expansion ring cone 42 with an expansion amplitude, when the oil pressure increases, the expansion ring cone 42 will be squeezed to push it outward, thereby reducing the expansion pressure, so that the pressure increase is within the range that the sleeve 1 can withstand to form a high-pressure zone.

4 and 13, after all the damping oil has returned through the inner oil passage 3b, the cover plate is in a horizontal state. When the user needs to use the toilet, the cover plate will be opened quickly under normal circumstances. In order to reduce the resistance force encountered by the user when opening the cover plate, a consistent shrinkage ring cone 43 is connected to the side of the circular ring 41 away from the pressure cover 5. The damping oil entering from the outer oil passage 3a1 will compress the shrinkage ring cone 43 inward, so that the strain gap 40 is separated from the inner wall of the shaft cavity 10 after being compressed, allowing the damping oil to pass quickly. That is, the damping oil flowing in from the outer oil passage 3a1 can reduce the diameter of the strain gap 40 more quickly when it encounters the shrinkage ring cone 43 with a certain curvature, and shorten the shrinkage time of the circular ring 41, so that the user will not feel any jamming or stagnation in the process of quickly opening the cover plate.

10-12, in the process of damping oil flowing back through the oil passage 3b, the rotating shaft 2 is also rotating continuously, and the outer screw shaft segment 21 and the gradient circular shaft segment 22 are also rotating continuously. The gradient circular shaft segment 22 and the inner circular hole 302 form an opening valve Z, and the gradient circular shaft segment 22 includes a closing diameter 221, a gradual diameter 222, and an opening diameter 223 connected in sequence from the extension direction of the outer screw shaft segment 21. When the piston 3 moves in the direction close to the pressure cover 5, the opening diameter 223, The gradual diameter 222 and the closed diameter 221 cooperate with the inner circular hole 302 in sequence. When the outer screw shaft section 21 rotates, the piston 3 moves toward the side of the pressure cover 5, and the inner circular hole 302 in the piston 3 constantly changes its position. In the process of changing its position, the inner circular hole 302 will cooperate with the opening diameter 223, the gradual diameter 222, and the closed diameter 221 in sequence, so that the rotation speed of the rotating shaft 2 changes from fast to slow, and from slow to uniform, so that the cover plate can fall quickly, and then fall slowly at a uniform speed after falling to a certain angle.

In the above-mentioned embodiment, the various parts of the gradient circular shaft segment 22 are of unequal diameters, but the equal diameter does not affect the use of the gradient circular shaft segment 22. In another embodiment of the present case, referring to FIG14, the gradient circular shaft segment 22 is a mating shaft connected to the outer screw shaft segment 21, the head and tail of the mating shaft are of equal diameter, and the mating shaft includes a large diameter portion 227 connected to the outer screw shaft segment 21, a gradient groove 228 which is arranged in the direction away from the side of the large diameter portion 227 and whose groove width gradually increases, and a small diameter groove 229 which is connected to the gradient groove 228 and whose groove width is less than or equal to the diameter length of the end section of the gradient groove 228. It can be clearly seen from the figure that the gradient at this time The circular shaft section 22 is of constant diameter from beginning to end, but two grooves are provided on the gradient circular shaft section 22, namely the gradient groove 228 and the small diameter groove 227, which achieve the same effect as the gradient diameter 222 and the opening diameter 223 in the above-mentioned embodiment, and the technical effect of the large diameter portion 229 is equal to that of the closing diameter 221. The small diameter groove 227 allows the cover plate to drop rapidly through the oil in the early stage, and the oil passing area at the gradient diameter 222 is reduced, and the cover plate begins to decelerate until it reaches the position of the large diameter portion 227, at which point the groove completely disappears, the oil passing area is stable, the oil passing speed is slow and steady, and the cover plate begins to drop at a uniform speed, achieving the same technical effect as the above-mentioned embodiment.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (10)

A rotary damping mechanism, comprising: a shaft sleeve (1) whose shaft cavity (10) is filled with damping oil, a rotating shaft (2) whose inner shaft section (20) is sealed and rotatably matched with the shaft cavity (10), and a gland (5) for sealing an opening of the shaft sleeve (1), characterized in that it also comprises: a piston (3) mounted in the shaft cavity (10) and cooperating with the rotating shaft (2), the piston (3) comprising a center hole (30) opened in the axial direction, the center hole (30) consisting of a threaded hole (301) and an inner circular hole (302), the inner shaft section (20) comprising an outer screw shaft section (21) and a gradient circular shaft section (22), the outer screw shaft section (21) being threadedly connected in the threaded hole (301) so that the rotating shaft (2) can actuate the piston (3) to axially reciprocate in the shaft cavity (10) to compress the damping oil; The gap between the piston (3) and the wall of the shaft cavity (10) forms an outer oil passage (3a) of the piston (3), and the gap between the threaded hole (301) and the outer screw shaft section (21) forms an inner oil passage (3b) of the piston (3); A plug ring (4) is mounted on the end of the piston (3) close to the outer shaft section of the rotating shaft (2) and is movable in the axial direction thereof; the plug ring (4) cooperates with the piston (3) and the wall of the shaft cavity (10) to form a one-way valve (Q) for opening and closing the outer oil passage (3a); and the inner circular hole (302) cooperates with the gradient circular shaft section (22) to form an opening valve (Z) for opening and closing the inner oil passage (3b); When the actuating piston (3) of the rotating shaft (2) moves to a point where both the one-way valve (Q) and the opening valve (Z) are closed, the damping oil slowly seeps through the external oil passage (3a) and/or the internal oil passage (3b), the oil pressure difference at both ends of the piston (3) in the shaft cavity (10) slowly decays, and the decayed oil pressure brake piston (3) slowly moves, causing the rotating shaft (2) to slowly rotate. A rotary damping mechanism according to claim 1, characterized in that the piston (3) comprises a cylindrical plug body (31) movable axially inwardly in the shaft cavity (10), and a convex edge (32) extending from the end of the cylindrical plug body (31) toward the outer shaft section of the rotating shaft (2), and the plug ring (4) reciprocates between the outer ring surface of the cylindrical plug body (31) on the side close to the outer shaft section of the rotating shaft (2) and the convex edge (32). A rotary damping mechanism according to claim 2, characterized in that the cylindrical plug body (31) includes a plurality of guide grooves (311) opened in the radial direction, a plurality of guide ribs (101) corresponding to the guide grooves (311) are fixedly connected to the inner wall of the shaft cavity (10), and the guide groove (311) is open at one end close to the inner circular hole (302) and closed at one end away from the inner circular hole (302). A rotary damping mechanism according to claim 2, characterized in that the cylindrical plug body (31) further includes a plurality of external oil passages (3a) opened in the radial direction, the external oil passages (3a) and the guide grooves (311) are arranged alternately at intervals, and both ends of the external oil passages (3a) are open. When the plug ring (4) is pressed against the external oil passage opening (3a1) of the external oil passage (3a), the external oil passage (3a) is closed and the damping oil flows into the external screw shaft section (21); when the plug ring (4) is away from the external oil passage opening (3a1) of the external oil passage (3a), the external oil passage (3a) is opened and the damping oil moves along the external oil passage (3a) toward the side close to the gland (5). A rotary damping mechanism according to claim 4, characterized in that a strain gap (40) is provided in the radial direction of the plug ring (4), and the strain gap (40) provides a strain space for radial expansion or contraction of the plug ring (4). A rotary damping mechanism according to claim 5, characterized in that the plug ring (4) comprises a circular ring (41) sleeved between the cylindrical plug body (31) and the convex edge (32), the circular ring (41) comprising a plurality of limiting protrusions (411) arranged on its inner ring surface and evenly distributed at equal intervals, an oil-passing recess (412) provided in the gap between the limiting protrusions (411) and the limiting protrusions (411), the limiting protrusions (411) corresponding to the positions of the external oil-passing ports (3a1), and the limiting protrusions (411) abut against the external oil-passing ports (3a1) or the convex edge (32) as the plug ring (4) moves. A rotary damping mechanism according to claim 6, characterized in that a side of the circular ring (41) close to the gland (5) is connected to a consistent expansion ring cone surface (42), and the strain gap (40) is subjected to the damping oil pressure to cause the expansion ring cone surface (42) to expand in diameter and then abut against the inner wall of the shaft cavity (10). A rotary damping mechanism according to claim 6, characterized in that a shrink ring cone surface (43) is connected to the side of the circular ring (41) away from the gland (5), and the damping oil entering from the external oil port (3a1) will compress the shrink ring cone surface (43) inward, so that the strain gap (40) is separated from the inner wall of the shaft cavity (10) after being compressed, allowing the damping oil to pass quickly. A rotary damping mechanism according to claim 1, characterized in that the gradient circular shaft segment (22) comprises a closed diameter (221), a gradually changing diameter (222), and an open diameter (223) which are sequentially connected in the extension direction of the outer screw shaft segment (21); when the piston (3) moves in the direction close to the pressure cover (5), the open diameter (223), the gradually changing diameter (222), and the closed diameter (221) sequentially cooperate with the inner circular hole (302). A rotary damping mechanism according to claim 1, characterized in that the gradient circular shaft segment (22) is a mating shaft connected to the external screw shaft segment (21), the mating shaft has equal diameters at the head and tail, and the mating shaft includes a large diameter portion (227) connected to the external screw shaft segment (21), a gradient groove (228) arranged in a direction away from the side of the large diameter portion (227) and with a gradually increasing groove width, and a small diameter groove (229) that is connected to the gradient groove (228) and has a groove width less than or equal to the diameter length of the end section of the gradient groove (228).