WO2016034744A1

WO2016034744A1 - Balanced fluid regulator

Info

Publication number: WO2016034744A1
Application number: PCT/EP2015/070402
Authority: WO
Inventors: Guangbin Cao; Yehong PENG; Xinnong XU
Original assignee: Luxembourg Patent Co SA
Current assignee: Luxembourg Patent Co SA
Priority date: 2014-09-05
Filing date: 2015-09-07
Publication date: 2016-03-10
Anticipated expiration: 2017-03-05
Also published as: CN204083404U

Abstract

The present invention discloses a fluid regulator that can achieve a low outlet pressure and a steady outlet flow under large outlet flow. The regulator comprises a valve body, a pressure-regulating device and a balance device. The valve body has an inlet fluid pressure cavity, an outlet fluid pressure cavity, and a throttling orifice in fluid communication with the inlet fluid pressure cavity and the outlet fluid pressure cavity. The pressure-regulating device comprises a lever, a sealing device connected to a first end of the lever and a diaphragm assembly connected to a second end of the lever. The balance device comprises a balance hole and a balance member. The balance hole is provided on the valve body, wherein the balance hole is positioned at one side of the lever fixing device and the throttling orifice is positioned at the other side of the lever fixing device. The balance member and the balance hole are provided at a same side of the lever fixing device and configured so that a fluid from the inlet fluid pressure cavity can exert a force on the second end of the lever via the balance hole and the balance member.

Description

BALANCED FLUID REGULATOR

Technical field

[0001 ] The present invention generally relates to a fluid regulator, particularly to a fluid regulator with a balance level.

Background Art

[0002] With the growing demand of energy for global modernization and the increasingly high standards for environmental protection, the liquefied petroleum gas fuel, with its rich resources, huge reserves, has been in a rapidly increasing need in energy applications. The regulator using liquefied petroleum gas as fuel has been widely used in a number of areas in the market.

[0003] The current LPG (liquefied petroleum gas) regulator includes the following characteristics: when the outlet flow of the regulator is small, the outlet pressure and the closing pressure are very low; when the outlet flow of the regulator increases, the outlet pressure and the closing pressure of the regulator also rise. However, it is required in the current market that the outlet pressure and the closing pressure be still very low with the outlet flow increased. That is, a regulator with low pressure and large flow is in need in the market. So far, how to achieve a large and steady outlet flow of the regulator under low outlet pressure is still a problem.

Technical problem

[0004] It is an object of the present invention to provide a fluid regulator, which can achieve a low outlet pressure and a steady outlet flow when the outlet flow is large.

General Description of the Invention

[0005] To achieve the above object, the present invention provides a fluid regulator comprising a valve body and a pressure-regulating device. The valve body has an inlet fluid pressure cavity, an outlet fluid pressure cavity, and a throttling orifice in fluid communication with the inlet fluid pressure cavity and the outlet fluid pressure cavity. The pressure-regulating device comprises a lever, a sealing device connected with a first end of the lever and used to operatively seal the throttling orifice, and a diaphragm assembly connected with a second end of the lever. The lever is rotatably held within the outlet fluid pressure cavity through a lever fixing device. The lever is rotatable around the lever fixing device so that the throttling orifice is opened or closed. The fluid regulator further comprises a balance device. The balance device comprises: a balance hole provided on a partition between the inlet fluid pressure cavity and the outlet fluid pressure cavity, wherein the balance hole is positioned at one side of the lever fixing device and the throttling orifice is positioned at the other side of the lever fixing device; and a balance member, wherein the balance member and the balance hole are provided at a same side of the lever fixing device, and the balance member is configured so that a fluid from the inlet fluid pressure cavity will exert a force on the second end of the lever via the balance hole and the balance member.

[0006] Preferably, the balance device further comprises a sealing member. The balance member is slidably installed in the balance hole. One end of the balance member extends into the inlet fluid pressure cavity, and the other end of the balance member will exert a force on the second end of the lever due to the fluid pressure in the inlet fluid pressure cavity acting on the balance member. The sealing member is used to seal the gap between the balance hole and the balance member, thereby preventing a fluid in the inlet fluid pressure cavity from entering the outlet fluid pressure cavity via the balance hole.

[0007] Preferably, the balance member is a guiding rod. One end of the guiding rod extends into the inlet fluid pressure cavity, and the other end of the guiding rod is connected with the lever.

[0008] Preferably, the sealing device is a sealing gasket. The first end of the lever is provided with a groove used to accommodate the sealing gasket. The sealing member is a sealing ring. The partition is further provided with an annular projection projecting toward the inlet fluid pressure cavity and surrounding the balance hole. The sealing gasket and the sealing ring are positioned in the groove and the annular projection, respectively. [0009] Preferably, a washer is further provided above the sealing member. The washer is provided with a hole for the passage of the balance member. The washer is used to press the sealing ring.

[0010] Preferably, the diaphragm assembly comprises a diaphragm axle, a diaphragm, a diaphragm disc and a pressure-regulating spring. The diaphragm axle is connected with the second end of the lever. The diaphragm is located at a position where the valve body is connected with the valve cap having a breathing hole. The diaphragm disc is provided at a position where the diaphragm is connected with the diaphragm axle. The diaphragm, the diaphragm disc and the diaphragm axle are pressed against and fixedly connected to each other. The pressure-regulating spring is provided between the diaphragm disc and the valve cap.

[001 1 ] Preferably, the portions where the balance member and the balance hole contact with each other are coated with lubricating grease, and the balance member is made of wear-resistant materials.

[0012] Preferably, the balance member is located between the diaphragm axle and the lever fixing device.

[0013] Preferably, a connecting hole for the balance member is provided on the lever, and one end of the balance member is able to slide freely in the connecting hole.

[0014] Preferably, the balance member is a guiding rod, wherein one end of the guiding rod extends into the inlet fluid pressure cavity, and the other end of the guiding rod is provided with a boss contacting with the second end of the lever, thereby the guiding rod is able to exert a force on the lever.

[0015] According to one embodiment of the present invention, the balance member is a corrugated tube. A first end of the corrugated tube is fixed on the partition and is in fluid communication with the balance hole, and a second end of the corrugated tube is closed. The fluid in the inlet fluid pressure cavity may enter into the corrugated tube through the balance hole so that the corrugated tube deforms, thereby exerting a force on the second end of the lever. [0016] Preferably, the second end of the corrugated tube is connected with the second end of the lever.

[0017] According to another aspect of the present invention, it provides a fluid regulator comprising a valve cap having a breathing hole, a valve body, an outlet connector, a pressure-regulating device, a connection device and a switch device. The valve body has an inlet fluid pressure cavity, an outlet fluid pressure cavity, and a throttling orifice in fluid communication with the inlet fluid pressure cavity and the outlet fluid pressure cavity. The pressure-regulating device comprises a lever, a sealing device connected with a first end of the lever and used to operatively seal the throttling orifice, and a diaphragm assembly connected with a second end of the lever. The lever is rotatably held within the outlet fluid pressure cavity through a lever fixing device, and the lever is rotatable around the lever fixing device so that the throttling orifice is opened or closed. The fluid regulator further comprises a balance device. The balance device comprises: a balance hole provided on a partition between the inlet fluid pressure cavity and the outlet fluid pressure cavity, wherein the balance hole is positioned at one side of the lever fixing device and the throttling orifice is positioned at the other side of the lever fixing device; a balance member positioned between the diaphragm assembly and the lever fixing device and slidably installed in the balance hole, wherein one end of the balance member extends into the inlet fluid pressure cavity, and the other end of the balance member will exert a force on the second end of the lever due to the fluid pressure in the inlet fluid pressure cavity acting on the balance member; and a sealing member used to seal the gap between the balance hole and the balance member, thereby preventing a fluid in the inlet fluid pressure cavity from entering the outlet fluid pressure cavity via the balance hole.

[0018] In the present invention, the fluid regulator includes a balance device. Therefore, the fluid regulator can achieve a low outlet pressure and a steady outlet flow under large outlet flow.

Brief Description of the Drawings

[0019] Preferred embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings in which: [0020] Figure 1 is a structurally sectional view of a fluid regulator according to a first embodiment of the present invention;

[0021 ] Figure 2 is a top view of the fluid regulator according to the first embodiment of the present invention; and

[0022] Figure 3 is a structurally sectional view of the fluid regulator according to a second embodiment of the present invention.

Description of Preferred Embodiments

[0023] Hereinafter, a number of technical details are provided for the readers to better understand the present application. However, those skilled in the art may understand that technical solutions claimed by the present application can also be achieved even without these technical details. Various changes and modifications based on the following embodiments can be made.

[0024] Hereinafter, embodiments of the present invention will be described further in detail with reference to the drawings, so that the purposes, features and advantages of the present invention will be more clearly understood.

[0025] First Embodiment

[0026] Figures 1 and 2 illustrate a LPG regulator according to a preferred embodiment of the present invention, wherein Figure 1 is a structurally schematic view of the regulator, and Figure 2 is a top view of the regulator.

[0027] The LPG regulator comprises a valve cap 1 with a breathing hole, a valve body 2, a pressure-regulating device 3, a connecting device 4, a switch device 5, a balance device 6, and an outlet connector 7. In the present embodiment, the valve cap 1 and the valve body 2 are riveted together. However, the valve cap 1 and the valve body 2 can be connected through screws or by other ways. The valve cap 1 is positioned on the valve body 2. The pressure-regulating device 3 and the balance device 6 are located inside the valve body 2. The connecting device 4 is provided at the bottom of the valve body 2. The switch device 5 is provided at a side of the valve body 2. The outlet connector 7 is provided on the valve body 2 and is in fluid communication with the outlet fluid pressure cavity inside the valve body 2. The LPG regulator is connected with a pipe of the LPG cylinders by the connecting device 4. The switch device 5 controls the valve body 2 to be opened or closed. The pressure of the fluid entering the valve body can be reduced by the pressure-regulating device 3 and the balance device 4. The fluid with reduced pressure flows out of the valve body through the outlet connector 7. The valve body 2 includes an inlet fluid pressure cavity 21 and an outlet fluid pressure cavity 22. The inlet fluid pressure cavity 21 is in fluid communication with a gas inlet of the valve body, and the outlet fluid pressure cavity 22 is in fluid communication with a gas outlet of the valve body. The inlet fluid pressure cavity 21 and the outlet fluid pressure cavity 22 are separated by a partition 23. The partition 23 is provided with a throttling orifice 304. The throttling orifice 304 is in fluid communication with both the inlet fluid pressure cavity 21 and the outlet fluid pressure cavity 22.

[0028] The pressure-regulating device 3 of the present embodiment comprises a lever 301 , a pin 302 for fixing the lever, a sealing gasket 303 located at one end of the lever 301 , a diaphragm axle 305 located at the other end of the lever 301 , a diaphragm 308 positioned on the diaphragm axle 305, a diaphragm disc 309 located above the diaphragm 308, and a pressure-regulating spring 310.

[0029] The lever 301 is located in the outlet fluid pressure cavity 2 and fixed by the pin 302, so that the lever can be rotated around the pin 302. However, those skilled in the art may understand that the lever 301 can be fixed though other devices, as long as the lever can be rotated around said devices.

[0030] The first end of the lever 301 is located above the throttling orifice 304 and the second end of the lever 301 is connected with the diaphragm axle 305. The sealing gasket 303 is located at the first end of the lever 301 and used for sealing the throttling orifice 304. In the present embodiment, the diaphragm axle 305 is provided with a connecting part 306 with a smaller diameter. The connecting part 306 is engaged with a through-hole 307 of the lever 301 so that the balance device is connected with and in linkage with the lever 301 . Alternatively, in other embodiments, the diaphragm axle 305 can be connected to the lever 301 through a nut screwed on the diaphragm axle.

[0031 ] The diaphragm 308 is made of flexible materials, such as HNBR, FPM and so on. The edge of the diaphragm 308 is positioned at a position where the valve cap 1 and the valve body 2 are connected. The diaphragm disc 309 is made of rigid materials, such as copper, aluminum alloy and so on. The diaphragm 308 and the diaphragm disc 309 are tightly pressed against and sealingly fixed with the diaphragm axle 305. A pressure-regulating spring 310 is provided between the valve cap 1 and the diaphragm disc 309.

[0032] In the pressure-regulating process, the high-pressure LPG bursts the sealing gasket 303, and enters the outlet fluid pressure cavity 22 through the throttling orifice 304. The pressure in the outlet fluid pressure cavity 22 rises since the gas in the outlet fluid pressure cavity 22 increases. The gas pressure forces the diaphragm 308 to project upward overcoming the elastic force of the pressure- regulating spring 310. Then, the diaphragm axle 305 drives the second end of the lever 301 to move upward quickly and the first end to move downward, so that the gas inlet 304 is closed and the gas is prevented from entering the outlet fluid pressure cavity 22, thereby the pressure in the outlet fluid pressure cavity 22 stops rising. After the gas furnace is switched on, the pressure in the outlet fluid pressure cavity 22 drops due to the gas output, thus the diaphragm 308 sags downward and drives the second end of the lever to move downward and the first end to move upward, then the sealing gasket 303 is opened and the high-pressure LPG enters the outlet fluid pressure cavity 22. In the combustion process of the furnace, the diaphragm 308 keeps projecting upward or downward, and the sealing gasket 303 is driven by the lever 301 to be closed or opened, thereby completing the whole process of homeostasis.

[0033] The balance device 6 of the present embodiment comprises a guiding rod 61 , a balance hole 62, a sealing member 63 and a washer 64, wherein the washer 64 is provided with a hole 641 for the passage of the balance member 61 and the balance hole 62 is provided on the partition 23. The balance hole 62 is located at one side of the pin 302 for fixing the lever, while the throttling orifice 304 is located at the other side of the pin 302. The balance hole 62 is in fluid communication with both the inlet fluid pressure cavity 21 and the outlet fluid pressure cavity 22. One end of the guiding rod 61 passes through the balance hole 62 and extends into the inlet fluid pressure cavity 21 . The other end of the guiding rod 61 is located in the outlet fluid pressure cavity 22 and movably connected with the lever 301 . For example, the lever 301 is provided with a connecting hole 3012 for guiding rod, and said other end of the guiding rod 61 is inserted into the connecting hole 3012, so that the guiding rod can slide along the connecting hole 3012. Yet those skilled in the art may understand that the guiding rod 61 may not be always connected with the lever 301 , so long as the guiding rod 61 can exert an upward force on the lever 301 when the regulator is working.

[0034] The cross section of the guiding rod 61 can be any suitable shape, such as round, oval, ovate or polygons, and so on. Preferably, the portions where the balance member and the balance hole contact with each other are coated with lubricating grease, and the balance member is made of wear-resistant materials.

[0035] In this embodiment, the partition 23 is further provided with an annular projection 620, which projects toward the outlet fluid pressure cavity and surrounds the balance hole 62. The annular projection 620 is used to hold the sealing member 63. Preferably, the annular projection 620 is integrally formed on the partition 23. However, those skilled in the art will understand that the annular projection may be a separate component.

[0036] The sealing member 63 is used to seal the gap between the balance hole and the balance member, thereby preventing a fluid in the inlet fluid pressure cavity from entering the outlet fluid pressure cavity via the balance hole. Preferably, the sealing member is a sealing ring 63, as shown in Fig .1 .

[0037] When assembling, the sealing ring 63 is positioned in the annular projection 620, and a washer 64 is positioned above the sealing ring 63 to press the sealing ring 63, thereby sealing the gap between the guiding rod 61 and the balance hole 62. However, those skilled in the art may understand that the sealing ring can be provided between the guiding rod 61 and the balance hole 62 by other ways. For example, the balance hole is provided with a groove and the sealing ring is positioned in the groove. In this way, the purpose of the present invention can be achieved without the washer 64.

[0038] When it is expected to enlarge outlet flow without increasing the outlet pressure, the diameter of the throttling orifice 304 needs to be increased. The fluid in the inlet fluid pressure cavity 21 exerts a greater pressure on the sealing gasket 303 due to the diameter of the throttling orifice 304 increases. Meanwhile, due to the balance device 6, the fluid in the inlet fluid pressure cavity 21 will exert pressure on the bottom of the guiding rod 61 , thereby generating a counterclockwise moment toward the lever 301 . If the cross-sectional area of the guiding rod 61 and the distance between the balance hole 62 and the pin 302 are reasonably designed, the moment generated by the guiding rod 61 on the lever 31 can offset the moment generated due to the increase of the diameter of the throttling orifice, thereby keeping the dynamic balance of the pressure-regulating device.

[0039] The connecting device 4 of the present embodiment comprises a leaf spring 401 and a flat pin 402 both provided on the valve body 2, wherein a catch is engaged with the flat pin 402, and one end of the catch is closely contacted with the leaf spring 401 , which is used to clamp a cylinder pipe. A valve core 404 can be moved up and down, so as to open/close the bottled LPG. A valve sleeve 405 is provided on valve body 2. A reset spring 406 is provided between the valve core 404 and the valve sleeve 405, and the reset spring 406 is used for resetting the valve core 404. Sealing rings 407, 408 are respectively provided around the valve core 404 and the valve sleeve 405 for sealing purposes. When LPG starts to flow into the cylinder, the sealing ring 407 provided around the valve core can seal the regulator and the cylinder pipe; when LPG is cut off, the sealing ring 407 can also seal the gas in the regulator, thereby achieving dual sealing. A connecting handle 409 is used to control the opening and closing of the communication between the LPG regulator and the cylinder pipe. The connecting handle 409 has a security self-locking port 410 engaged with a switch handle 501 , so that the regulator cannot be separated from the cylinder pipe when LPG is in an open state, thereby ensuring user's safety. However, it may be understood that the connecting handle 409 may not have said security self-locking port 410. In some other embodiments of the present invention, other connecting device may be employed. For example, the leaf spring 401 can be replaced as a spring, and an eccentric ring is provided at a connecting part of the cylinder pipe, so that the engagement between the spring and the eccentric ring helps to clamp the cylinder pipe.

[0040] The switch device 5 of the present embodiment comprises a switch handle 501 , and the switch handle 501 is sealingly connected with the valve body by a sealing ring 502. A washer 503 is used to fix the switch handle 501 so as to prevent the switch handle 501 from being disengaged from the valve body 2. A cam 504 is provided between the valve body 2 and the valve core 404. The cam 504 is used to open the valve core 404, thereby achieving gas communication between the regulator and the cylinder.

[0041 ] When in use, the pipe of the LPG cylinder is connected with the connecting device 4. The cylinder and the regulator are tightly fastened with each other due to the elastic force generated by the leaf spring on the catch 403. If a user rotates the switch handle 501 of the switch device 5, the cam 504 will jack-up the valve core 404, so that the LPG cylinder is in gas communication with the regulator. At the same time, the security self-locking port 410 of the connecting handle 409 is fastened by the switch handle 501 , so that the cylinder pipe is not able to be separated from the regulator and the user's safety is well guaranteed.

[0042] The high-pressure LPG bursts gasket 303 and passes through the throttling orifice 304 into the outlet fluid pressure cavity 22. The gas pressure in the outlet fluid pressure cavity 22 rises as the gas in the outlet fluid pressure cavity 22 increases. The gas pressure forces the diaphragm 308 to project upward overcoming the elastic force of the pressure-regulating spring 312, thereby exerting a counterclockwise moment on the lever 301 through the diaphragm axle 305. At this point, on one hand, the fluid in the inlet fluid pressure cavity 21 generates an upward pressure on the sealing gasket 303, thereby exerting a clockwise moment on the lever 301 through the sealing gasket 303; on the other hand, the fluid in the inlet fluid pressure cavity 21 generates an upward pressure on the guiding rod, so as to exert a counterclockwise moment on the lever 301 through the guiding rod 61 . Due to the increasing fluid in the outlet fluid pressure cavity 22, the sum of the counterclockwise moments exerted on the lever becomes larger than that of the clockwise moments exerted thereon. Then the diaphragm axle 305 drives the right end of the lever 301 to move upward and the left end to move downward, so as to close the throttling orifice 304 and stop gas supply, thereby preventing the pressure in the outlet fluid pressure cavity 22 from increasing. After the gas furnace is switched on, gas flows outward, and the pressure in the outlet fluid pressure cavity drops. When the clockwise moment exerted on the lever 301 is larger than the counterclockwise moment exerted on the lever, the diaphragm 308 sags downward and drives the right end of the lever 301 to move downward and the left end to move upward, thereby opening the sealing gasket 303 and enabling the high-pressure LPG to enter the outlet fluid pressure cavity 22. During the burning process of the furnace, under the combined action of these three moments, the diaphragm 308 keeps vibrating, and the sealing gasket 303 is driven by the lever to be closed or opened, thereby achieving the whole process of homeostasis. The present invention includes the balance device 6, so as to enlarge outlet flow without increasing the outlet pressure, thereby achieving the coexistence of low outlet pressure and large outlet flow.

[0043] Second Embodiment

[0044] As shown in Figure 3, the present embodiment differs from first embodiment in that the present embodiment employs a balance device 6A. For clarity, similar parts will not be further described again.

[0045] In this embodiment, the balance device 6A includes a corrugated tube 6A1 and a balance hole 6A2. For narrative convenience, an end near the balance hole 6A2 of the corrugated tube 6A1 is called first end, while an end near the lever 301 of the corrugated tube 6A1 is called second end. The corrugated tube 6A1 is located inside of the outlet fluid pressure cavity 22. The first end of the corrugated tube 6A1 is fixed on the partition 23 and is in fluid communication with the balance hole 6A2, so that the fluid entering through the balance hole 6A2 can fully flow into the corrugated tube 6A1 . The second end of the corrugated tube 6A1 is connected with the second end of the lever 301 . The fluid in the inlet fluid pressure cavity 21 flows into the corrugated tube 6A1 through the balance hole 6A2 and exerts an upward force on the second end of the lever 301 , thereby exerting a counterclockwise torque on the lever 301 .

[0046] However, those skilled in the art may understand that the second end of the corrugated tube 6A1 may not be connected with the lever 301 . In this case, the second end of the corrugated tube 6A1 is closed. The fluid in the inlet fluid pressure cavity 21 flows into the corrugated tube 6A1 through the balance hole 6A2, then the corrugated tube 6A1 is lengthened so as to exert an upward force on the second end of the lever 301 , wherein the upward force produces a counterclockwise moment against the lever 301 .

[0047] Those skilled in the art may understand that the corrugated tube may also be substituted by a telescopic sleeve. In this case, on end of the telescopic sleeve is connected to the partition 23, while the other end of the telescopic sleeve is connected to the lever 301 . The fluid in the inlet fluid pressure cavity 21 flows into the telescopic sleeve through the balance hole 6A2, and exerts an upward force on the second end of the lever 301 , wherein the force generates a counterclockwise moment against the lever 301 , which can achieve the same effect of the present invention.

[0048] When in use, the pipe of the LPG cylinder is connected with the connecting device 4, and the regulator is tightly clasped with the cylinder pipe under the elastic action the leaf spring forces on the catch 403. If a user rotates the switch handle 501 of the switch device 5, the cam 504 will jack-up the valve core 404, so that the LPG cylinder is in gas communication with the regulator. At the same time, the security self-locking port 410 of the connecting handle 409 is clasped by the switch handle 501 , so that the cylinder pipe is not able to be separated from the regulator and the user's safety is well guaranteed.

[0049] The high-pressure LPG bursts gasket 303, and passes through the throttling orifice 304 into the outlet fluid pressure cavity 22. The gas pressure in the outlet fluid pressure cavity 22 rises as the gas in the outlet fluid pressure cavity 22 increases. The gas pressure forces the diaphragm 308 to project upward overcoming the elastic force of the pressure-regulating spring 312, thereby exerting a counterclockwise moment on the lever 301 through the diaphragm axle 305. At this point, on one hand, the fluid in the inlet fluid pressure cavity 21 exerts an upward pressure on the sealing gasket 303, thereby exerting a clockwise moment on the lever 301 through the sealing gasket 303; on the other hand, the fluid in the inlet fluid pressure cavity 21 exerts an upward pressure on the lever 301 through the corrugated tube 61 A, so as to exert a counterclockwise moment on the lever 301 . Due to the increasing fluid in the outlet fluid pressure cavity 22, the sum of the counterclockwise moments exerted on the lever becomes larger than that of the clockwise moments exerted thereon. Then the diaphragm axle 305 drives the right end of the lever 301 to move upward and the left end to move downward, so as to close the throttling orifice 304 and stop gas supply, thereby preventing the pressure in the outlet fluid pressure cavity 22 from increasing. After the gas furnace is switched on, gas flows outward, and the pressure in the outlet fluid pressure cavity drops. When the clockwise moment exerted on the lever 301 is larger than the counterclockwise moment exerted on the lever, the diaphragm 308 sags downward and drives the right end of the lever 301 to move downward and the left end to move upward, thereby opening the sealing gasket 303 and enabling the high-pressure LPG to enter the outlet fluid pressure cavity 22. During the burning process of the furnace, under the combined action of these three moments, the diaphragm 308 keeps vibrating, and the sealing gasket 303 is driven by the lever 301 to be closed or opened, thereby achieving the whole process of homeostasis. The present invention includes the balance device 6A, so as to enlarge outlet flow without increasing the outlet pressure, thereby achieving the coexistence of low outlet pressure and large outlet flow.

Preferred embodiments of the present invention has been described in detail hereinbefore, but it is to be understood that, after reading the above teachings of the present invention, those skilled in the art may make various modifications or amendments to the present invention. These equivalent forms also fall into the scope limited by appended claims of the present application.

Claims

1 . A fluid regulator (100) comprising a valve body (2) and a pressure-regulating device (3), wherein the valve body (2) has an inlet fluid pressure cavity (21 ), an outlet fluid pressure cavity (22), and a throttling orifice (304) in fluid communication with the inlet fluid pressure cavity (21 ) and the outlet fluid pressure cavity (22), the pressure-regulating device (3) comprising a lever(301 ), a sealing device (303) connected with a first end of the lever (301 ) and used to operatively seal the throttling orifice (304), and a diaphragm assembly (305, 308, 309, 310) connected with a second end of the lever (301 ), wherein the lever (301 ) is rotatably held within the outlet fluid pressure cavity (22) through a lever fixing device (302), and the lever (301 ) is rotatable around the lever fixing device (302) so that the throttling orifice (304) is opened or closed, characterized in that the fluid regulator (100) further comprises a balance (6, 6A) device, the balance device (6, 6A) comprises: a balance hole (62, 6A2) provided on a partition (23) between the inlet fluid pressure cavity (21 ) and the outlet fluid pressure cavity (22), wherein the balance hole (62, 6A2) is positioned at one side of the lever fixing device (302) and the throttling orifice (304) is positioned at the other side of the lever fixing device (302);

a balance member (61 , 6A1 ), wherein the balance member (61 , 6A1 ) and the balance hole (62, 6A2) are provided at a same side of the lever fixing device (302), and the balance member (61 , 6A1 ) is configured so that a fluid from the inlet fluid pressure cavity (21 ) will exert a force on the second end of the lever (301 ) via the balance hole (62, 6A2) and the balance member (61 , 6A1 ).

2. The fluid regulator according to claim 1 , wherein the balance device (6) further comprises a sealing member (63), wherein the balance member (61 ) is slidably installed in the balance hole (62); one end of the balance member (61 ) extends into the inlet fluid pressure cavity (21 ), and the other end of the balance member (21 ) will exert a force on the second end of the lever (301 ) due to the fluid pressure in the inlet fluid pressure cavity (21 ) acting on the balance member (61 ); and the sealing member (63) is used to seal the gap between the balance hole (62) and the balance member (61 ), thereby preventing a fluid in the inlet fluid pressure cavity (21 ) from entering the outlet fluid pressure cavity (22) via the balance hole (62).

3. The fluid regulator according to claim 1 or 2, wherein the balance member is a guiding rod (61 ) with one end of the guiding rod (61 ) extends into the inlet fluid pressure cavity (21 ) and the other end of the guiding rod (61 ) is connected with the lever (301 ).

4. The fluid regulator according to any one of claims 1 to 3, wherein the sealing device is a sealing gasket (303), wherein the first end of the lever (301 ) is provided with a groove (301 1 ) used to accommodate the sealing gasket (303); the sealing member is a sealing ring (63); and the partition (23) is further provided with an annular projection (620) projecting toward the inlet fluid pressure cavity (21 ) and surrounding the balance hole (62), wherein the sealing gasket (303) and the sealing ring (63) are positioned in the groove (301 1 ) and the annular projection (620), respectively.

5. The fluid regulator according to any one of claims 1 to 4, characterized in that a washer (64) is further provided above the sealing member (63), wherein the washer (64) is provided with a hole (641 ) for the passage of the balance member (61 ), and the washer (64) is used to press the sealing ring (63).

6. The fluid regulator according to any one of claims 1 to 5, wherein the diaphragm assembly (305, 308, 309, 310) comprises a diaphragm axle (305), a diaphragm (308), a diaphragm disc (309) and a pressure-regulating spring (310); wherein,

the diaphragm axle (305) is connected with the second end of the lever (301 );

the diaphragm (308) is located at a position where the valve body (2) is connected with the valve cap (1 ) having a breathing hole;

the diaphragm disc (309) is provided at a position where the diaphragm (308) is connected with the diaphragm axle (305), wherein the diaphragm (308), the diaphragm disc (309) and the diaphragm axle (305) are pressed against and fixedly connected to each other; and the pressure-regulating spring (310) is provided between the diaphragm disc (309) and the valve cap (1 ).

7. The fluid regulator according to any one of claims 1 to 6, wherein portions where the balance member (61 ) and the balance hole (62) contact with each other are coated with lubricating grease, and the balance member (61 ) is made of wear-resistant materials.

8. The fluid regulator according to any one of claims 1 to 7, characterized in that the balance member (61 ) is located between the diaphragm axle (305) and the lever fixing device (302).

9. The fluid regulator according to any one of claims 1 to 8, wherein a connecting hole (3012) for the balance member is provided on the lever (301 ), and one end of the balance member (61 ) is able to slide freely in the connecting hole (3012).

10. The fluid regulator according to any one of claims 1 to 8, wherein the balance member is a guiding rod (61 ), wherein one end of the guiding rod (61 ) extends into the inlet fluid pressure cavity (21 ), and the other end of the guiding rod (61 ) is provided with a boss (61 1 ) contacting with the second end of the lever (301 ), thereby the guiding rod (61 ) is able to exert a force on the lever (301 ).

1 1 . The fluid regulator according to any one of claims 1 to 10, wherein the balance member is a corrugated tube (6A1 ), wherein a first end of the corrugated tube (6A1 ) is fixed on the partition (23) and is in fluid communication with the balance hole (6A2), and a second end of the corrugated tube (6A1 ) is closed, wherein the fluid in the inlet fluid pressure cavity (21 ) will enter into the corrugated tube (6A1 ) through the balance hole (6A2) so that the corrugated tube (6A1 ) deforms, thereby exerting a force on the second end of the lever (301 ).

12. The fluid regulator according to claim 1 1 , wherein the second end of the corrugated tube (6A1 ) is connected with the second end of the lever (301 ).

13. A fluid regulator (100), comprising a valve cap (1 ) having a breathing hole, a valve body (2), an outlet connector (7), a pressure-regulating device (3), a connection device (4) and a switch device (5), wherein the valve body (2) has an inlet fluid pressure cavity (21 ), an outlet fluid pressure cavity (22), and a throttling orifice (304) in fluid communication with the inlet fluid pressure cavity (21 ) and the outlet fluid pressure cavity (22), wherein the pressure-regulating device (3) comprises a lever (301 ), a sealing device (303) connected with a first end of the lever (301 ) and used to operatively seal the throttling orifice (304), and a diaphragm assembly (305, 308, 309, 310) connected with a second end of the lever (301 ), wherein the lever (301 ) is rotatably held within the outlet fluid pressure cavity (22) through a lever fixing device (302), and the lever (301 ) is rotatable around the lever fixing device (302) so that the throttling orifice (304) is opened or closed, characterized in that the fluid regulator (100) further comprises a balance device (6, 6A), the balance device (6, 6A) comprises:

a balance hole (62, 6A2) provided on a partition (23) between the inlet fluid pressure cavity (21 ) and the outlet fluid pressure cavity (22), wherein the balance hole (62, 6A2) is positioned at one side of the lever fixing device (302) and the throttling orifice (304) is positioned at the other side of the lever fixing device (302);

a balance member (61 , 6A1 ) positioned between the diaphragm assembly (305, 308, 309, 310) and the lever fixing device (302) and slidably installed in the balance hole (62, 6A2), wherein one end of the balance member (61 , 6A1 ) extends into the inlet fluid pressure cavity (21 ), and the other end of the balance member (61 , 6A1 ) will exert a force on the second end of the lever (301 ) due to the fluid pressure in the inlet fluid pressure cavity (21 ) acting on the balance member (61 , 6A1 ); and

a sealing member (63) used to seal the gap between the balance hole (62) and the balance member (61 ), thereby preventing a fluid in the inlet fluid pressure cavity (21 ) from entering the outlet fluid pressure cavity (22) via the balance hole (62).