CN107387825B

CN107387825B - Pressure reducing valve

Info

Publication number: CN107387825B
Application number: CN201710642845.4A
Authority: CN
Inventors: 吴柏敏; 梁建林; 陈炯亮; 黎彪; 陈键明; 何国豪; 区家显; 潘庆祥; 霍达文
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-07-31
Filing date: 2017-07-31
Publication date: 2024-04-05
Anticipated expiration: 2037-07-31
Also published as: CN107387825A

Abstract

The invention discloses a pressure reducing valve, which comprises a valve body, an outer cavitation preventing cover, an inner cavitation preventing cover, a sealing element, a valve clack, a valve rod and a cavity, wherein the valve body is fixedly connected with the cavity, the valve rod comprises a valve shaft and a baffle block, the valve shaft and the baffle block are integrally formed, the valve clack and the baffle block are fixed at the same end of the valve shaft, the other end of the valve shaft is fixed in the valve body, the sealing element is arranged in the valve clack, the sealing element is abutted against the outer cavitation preventing cover and the inner cavitation preventing cover, the inner cavitation preventing cover is fixed between the baffle block and the valve clack, the outer cavitation preventing cover is fixedly arranged in the valve body, an inlet end cavity and an outlet end cavity are arranged in the valve body, and fluid flows in from the inlet end cavity and flows out from the outlet end cavity. According to the invention, the valve shaft and the check block are integrally formed, so that the inner anti-cavitation cover and the valve clack are tightly attached, when the pressure difference between the inlet and the outlet of the valve is large, the sealing element cannot be loosened, so that the valve clack loses the sealing property, water cannot leak when the pressure reducing valve is closed, and the sealing property and the safety are high.

Description

Pressure reducing valve

Technical Field

The present invention relates to a pressure reducing valve, and more particularly, to a pressure reducing valve for preventing a seal from falling off.

Background

The pressure reducing valve is a valve which adjusts the inlet pressure to be reduced to a certain required outlet pressure by controlling the opening degree of an opening and closing part in the valve body and automatically keeps the outlet pressure stable by depending on the energy of a medium. The pressure reducing valve is widely used in high-rise buildings, areas with too high water pressure of urban water supply pipelines, mines and other occasions to ensure that each water point in the water supply system obtains proper service water pressure and flow.

However, the conventional pressure reducing valve has the following drawbacks:

(1) In the traditional pressure reducing valve structure, in order to ensure that the connection between the inner anti-cavitation cover and the valve clack is more tight, a screw-nut matching clamping structure is adopted, and when the pressure difference between an inlet and an outlet of the valve is large and the valve is opened and closed rapidly, the phenomenon of screw matching loosening can occur due to frequent stress of long-term vibration, so that screw, nut and other threaded parts are extremely destructive after falling into a valve body or a pump body;

(2) When the traditional pressure reducing valve is in a working condition that the pressure difference between an inlet and an outlet of the valve is large or the pressure reducing valve is opened and closed quickly, the inner anti-cavitation cover and the valve clack are easily separated due to frequent stress caused by long-term vibration, and the sealing ring between the inner anti-cavitation cover and the valve clack is loosened to cause the valve clack to lose the sealing function, so that the pressure reducing valve still has water leakage when being closed, and the safety performance of the pressure reducing valve is greatly reduced.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a pressure reducing valve which has higher safety performance, and mainly aims to solve the problem that a sealing element between an inner anti-cavitation cover and a valve clack can loose to cause the loss of the sealing function of the valve clack at present, and provide a safer and more reliable fastening mode between the inner anti-cavitation cover and the valve clack.

The invention adopts the following technical scheme:

the utility model provides a relief pressure valve, relief pressure valve includes valve body, outer anti-cavitation cover, interior anti-cavitation cover, sealing member, valve clack, valve rod and cavity, the valve body with cavity fixed connection, the valve rod includes valve shaft and dog, the valve shaft with dog integrated into one piece, outer anti-cavitation cover fixed mounting in the valve body, interior anti-cavitation cover is fixed in between the dog with the valve clack, the valve clack the dog is fixed in the same end of valve shaft, the other end of valve shaft is fixed in the valve body, the sealing member set up in the valve clack, the sealing member with outer anti-cavitation cover and interior anti-cavitation cover all offset, so as to prevent the sealing member breaks away from the valve clack.

Further, a first pressure guide hole is formed in the valve clack and communicated with the sealing piece.

Further, the pressure reducing valve further comprises a diaphragm, the cavity comprises an upper cavity cover and a lower cavity cover, the circumferential surface of the outer ring of the diaphragm is fixed between the upper cavity cover and the lower cavity cover, a bulge is arranged at the edge of the upper cavity cover, a groove is arranged at the edge of the lower cavity cover, the bulge is matched with the groove, one side of the diaphragm is propped against the bulge, and the other side of the diaphragm is propped against the groove.

Further, the inner anti-cavitation cover is positioned at the bottom of the valve clack, and an oblong slotted hole is formed in the inner anti-cavitation cover.

Further, a piston is fixed at the other end of the valve shaft, the piston is fixed on the upper cavity cover in a sliding mode, and a second pressure guide hole is formed in the piston.

Further, a guide sleeve is sleeved in the upper cavity cover, and the piston slides in the guide sleeve.

Further, an annular groove is formed in the valve clack, and the sealing element is installed in the annular groove; the number of the first pressure guide holes and the number of the annular grooves are multiple.

Further, the pressure relief valve also includes a filter device secured within the inlet end chamber.

Further, an inlet end chamber and an outlet end chamber are arranged in the valve body, a control cavity is arranged in the cavity, the control cavity is respectively communicated with the inlet end chamber and the outlet end chamber, and a filter, a second stop valve and a regulating valve are sequentially connected between the inlet end chamber and the control cavity.

Further, a first stop valve and a pilot valve are sequentially connected between the outlet end chamber and the control chamber; the pressure reducing valve further comprises a hanging ring, and the hanging ring is fixed at one end of the cavity.

Compared with the prior art, the invention has the beneficial effects that:

(1) The invention provides a pressure reducing valve for preventing a sealing element from falling off, wherein a valve rod comprises a valve shaft and a stop block, and the valve shaft and the stop block are integrally formed, so that the inner cavitation prevention cover is tightly attached to a valve clack. When the pressure difference between the inlet and the outlet of the valve is large and the valve clack is opened and closed quickly, the inner cavitation-preventing cover is not easy to separate from the valve clack, and the sealing element between the inner cavitation-preventing cover and the valve clack cannot be loosened to cause the valve clack to lose the sealing function, so that the pressure reducing valve cannot leak water when the pressure reducing valve is closed, and the sealing performance and the safety are high.

(2) According to the invention, the valve shaft and the stop block are integrally formed, so that a safer and more reliable fastening mode between the inner cavitation-proof cover and the valve clack is provided. The screw-nut opposite-drawing clamping structure is avoided, the screw-nut matching clamping structure is adopted, when the valve is in the working condition that the pressure difference between an inlet and an outlet of the valve is large and the valve is opened and closed rapidly, the phenomenon that the screw-nut matching is loose can occur due to frequent stress caused by long-term vibration, so that the destructiveness is extremely high after screw parts such as screws and nuts fall into a valve body or a pump body, and the safety performance of the pressure reducing valve can be greatly improved by an integrally formed connecting mode.

The invention is described in further detail below with reference to the drawings and the detailed description.

Drawings

FIG. 1 is a schematic cross-sectional view of a pressure reducing valve according to the present invention;

FIG. 2 is an enlarged view of one of the pressure relief valves A of FIG. 1;

fig. 3 is an enlarged view of one of the pressure reducing valves B of fig. 1.

In the figure: 100. a pressure reducing valve; 10. a valve body; 11. an inlet end chamber; 12. an outlet end chamber; 20. a filtering device; 30. an outer anti-cavitation cover; 40. an inner anti-cavitation cover; 41. an oblong slot; 50. a seal; 60. a valve flap; 61. a first pressure guiding hole; 62. an annular groove; 70. a valve stem; 71. a valve shaft; 72. a stop block; 80. an elastic member; 90. a membrane; 101. a cavity; 1011. a control chamber; 1012. an upper cavity cover; 1013. a lower chamber cover; 1014. a protrusion; 1015. a groove; 102. a fastener; 103. a gasket; 104. a pressing plate; 105. a top ring; 106. a top cover; 107. a copper sleeve; 108. a first stop valve; 109. a pilot valve; 110. a filter; 111. a second shut-off valve; 112. a regulating valve; 113. a hanging ring; 114. a piston; 1141. a second pressure guiding hole; 115. and (5) guiding the sleeve.

Detailed Description

The invention will be further described with reference to specific embodiments shown in fig. 1-3.

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 to 3, the present invention provides a pressure reducing valve 100 for preventing a seal from falling off, the pressure reducing valve 100 comprising a valve body 10, a filter device 20, an outer anti-cavitation cap 30, an inner anti-cavitation cap 40, a seal 50, a valve flap 60, a valve stem 70, an elastic member 80, a diaphragm 90, a cavity 101, a fastener 102, a gasket 103, a pressure plate 104, a top ring 105, a top cover 106, a copper cover 107, a first stop valve 108, a pilot valve 109, a filter 110, a second stop valve 111, a regulating valve 112, a hanging ring 113, a piston 114, and a guide sleeve 115.

The valve body 10 is fixedly connected with the cavity 101, an inlet end cavity 11 and an outlet end cavity 12 are arranged in the valve body 10, a control cavity 1011 is arranged in the cavity 101, and the control cavity 1011 is respectively communicated with the inlet end cavity 11 and the outlet end cavity 12.

A filter 110, a second shut-off valve 111, and a regulating valve 112 are sequentially connected to a pipe between the inlet-side chamber 11 and the control chamber 1011. A first stop valve 108 and a pilot valve 109 are sequentially connected to the pipeline between the outlet end chamber 12 and the control chamber 1011. The lifting ring 113 is fixed at one end of the cavity 101, so as to facilitate moving and carrying the pressure reducing valve 100.

The filter device 20 is secured within the inlet end chamber 11 and the diaphragm 90 is secured within the cavity 101. The sealing element 50 is fixedly arranged in the valve clack 60, the sealing element 50 is positioned between the valve clack 60 and the outer cavitation prevention cover 30 and the inner cavitation prevention cover 40, the sealing element 50 is propped against the outer cavitation prevention cover 30 and the inner cavitation prevention cover 40, and the outer cavitation prevention cover 30 is fixedly arranged in the valve body 10.

The valve stem 70 includes a valve shaft 71 and a stopper 72. The valve shaft 71 is integrally formed with a stopper 72, the stopper 72 is located at one end of the valve shaft 71, and the other end of the valve shaft 71 is fixed to the center of the diaphragm 90 by a clamping structure. The elastic member 80 is sleeved on the valve shaft 71, two ends of the elastic member 80 respectively prop against the cavity 101 and the valve clack 60, the outer anti-cavitation cover 30 is fixedly installed in the valve body 10, and the inner anti-cavitation cover 40 is fixed between the stop block 72 and the valve clack 60. The inner anti-cavitation cover 40 is positioned at the bottom of the valve clack 60, and an oblong slotted hole 41 is arranged on the inner anti-cavitation cover 40. Fluid flows in from the inlet end chamber 11 and out from the outlet end chamber 12.

The clamping structure comprises a fastener 102, a gasket 103, two pressing plates 104, a top ring 105 and a top sleeve 106. The valve shaft 71 is sleeved with a fastener 102, a gasket 103, two pressing plates 104, a diaphragm 90, a top ring 105 and a top sleeve 106 from top to bottom. The diaphragm 90 is clamped between the two pressing plates 104, one end of the top sleeve 106 abuts against the valve clack 60, and the top sleeve 106 is slidably connected with the cavity 101 through the copper sleeve 107. The fastener 102 is a double lock nut, and the fastener 102 is screwed to one end of the valve shaft 71.

As shown in fig. 1, the other end of the valve shaft is fixed with a piston 114, the piston 114 is slidably fixed on the upper cavity cover 1012, and a second pressure guiding hole 1141 is provided on the piston 114. The upper chamber cap 1012 is internally provided with a guide sleeve 115, and the piston 114 slides in the guide sleeve 115.

When the valve rod 70 is rapidly lifted, the piston 114 is arranged at the other end of the valve shaft 71, and the piston 114 is rapidly lifted and simultaneously fluid can shuttle back and forth in the second pressure guiding hole 1141, which is equivalent to a buffer device, so that collision and impact between the stop block 72 and the inner cavitation prevention cover 40 are avoided.

As shown in fig. 2, the valve clack 60 is provided with a first pressure guiding hole 61 and an annular groove 62, the sealing element 50 is installed in the annular groove 62, the first pressure guiding hole 61 is communicated with the sealing element 50, and the number of the first pressure guiding hole 61 and the number of the annular groove 62 can be designed to be a plurality. When the pressure difference between the inlet and the outlet of the valve is large or the valve is opened and closed quickly, the inner anti-cavitation cover 40 and the valve clack 60 are slightly separated due to frequent stress caused by long-term vibration, and the valve clack 60 is provided with the first pressure guide hole 61 and is communicated with the sealing element 50, so that a large pressure difference exists on two sides of the sealing element 50, a part of the sealing element 50 can be extruded into the first pressure guide hole 61, the sealing element 50 positioned between the inner anti-cavitation cover 40 and the valve clack 60 is not easy to release, and the valve clack 60 still has a sealing function, so that water leakage is not caused when the pressure reducing valve 100 is closed, and the sealing property and the safety of the pressure reducing valve are greatly improved.

The elastic member 80 is used to drive the valve flap 60 to return, and the sealing member 50 is installed on the valve flap 60 and presses the outer anti-cavitation cover 30. The seal is used to seal the gap between the flap 60 and the outer anti-cavitation cap 30 when the fluid is in a static state. The valve shaft 71 and the stop 72 are integrally formed, so that the inner anti-cavitation cover 40 and the valve clack 60 are tightly attached. The traditional screw and nut opposite-drawing clamping structure is avoided, the screw and nut matching clamping structure is adopted, when the valve is in the working condition that the pressure difference between an inlet and an outlet of the valve is large and the valve is opened and closed rapidly, the phenomenon that the screw matching is loose can occur due to frequent stress of long-term vibration, so that the screw, the nut and other threaded parts fall into the valve body 10 or the pump body and then are extremely destructive, and the safety performance of the pressure reducing valve 100 is greatly improved in an integrally formed connecting mode.

The inner cavitation prevention cover 40 is made of stainless steel material having high tensile strength and cavitation resistance, and enough cavitation-preventing metal allowance is reserved, so that the pressure reducing valve has longer service life under the condition of large pressure difference. The oblong slot 41 performs preliminary decompression treatment on the fluid just entering the decompression valve, and can transfer part of cavitation that would otherwise occur on the outer cavitation prevention cover 30 to the inner cavitation prevention cover 40, further improving the sealing property between the valve flap 60 and the outer cavitation prevention cover 30.

As shown in fig. 3, the chamber 101 includes an upper chamber lid 1012 and a lower chamber lid 1013. The outer circumferential surface of the diaphragm 90 is sandwiched between the upper chamber cover 1012 and the lower chamber cover 1013, and is fastened by screws. In order to improve the tightness of the control cavity 1011, a convex groove butt clamp sealing structure is arranged at the joint of the diaphragm and the cavity 101, a convex 1014 is arranged at the edge of the upper cavity cover 1012, a groove 1015 is arranged at the edge of the lower cavity cover 1013, the diaphragm is clamped between the convex 1014 and the groove 1015, the convex 1014 is matched with the groove 1015, one side of the diaphragm 90 is propped against the convex 1014, and the other side of the diaphragm 90 is propped against the groove 1015, so that the condition that liquid at the joint of the diaphragm 90 and the cavity 101 flows outwards is avoided.

It will be appreciated that in this embodiment, the filtering device 20 is a filter screen; the outer anti-cavitation cover 30 is a valve seat; the sealing member 50 is a sealing ring; the elastic member 80 is a compression spring and maintains a certain amount of precompression. Although the pressure reducing valve 100 is a diaphragm type pressure reducing valve in the present embodiment, some of the technical solutions are not affected to be applicable to any other type of pressure reducing valve.

The working principle of the invention is as follows: as indicated by the arrow in fig. 1, fluid initially enters the inlet end chamber 11 and finally flows out of the outlet end chamber 12. The diaphragm 90 is used for directly sensing the downstream pressure to drive the valve clack 60, the opening degree of the valve clack 60 is controlled, namely the overflow area is changed, so that the flow speed and the kinetic energy of the fluid are changed, different pressure losses are caused, and the aim of reducing pressure is achieved. And then, by means of the adjustment of the control and adjustment system, the fluctuation of the valve back pressure is balanced with the spring force, so that the valve back pressure is kept constant within a certain error range.

The invention provides a pressure reducing valve 100 for preventing a sealing element from falling, wherein a valve rod 70 comprises a valve shaft 71 and a stop block 72, the valve shaft 71 and the stop block 72 are integrally formed, so that the joint between an inner anti-cavitation cover 40 and a valve clack 60 is more compact, when the pressure difference between an inlet and an outlet of the valve is large and the valve clack 60 is opened and closed rapidly, the inner anti-cavitation cover 40 and the valve clack 60 are not easy to separate, the sealing element 50 between the inner anti-cavitation cover 40 and the valve clack 60 is not loosened, and the like, so that the valve clack 60 loses sealing function, and water leakage is avoided when the pressure reducing valve 100 is closed, and the sealing performance and the safety are high.

The valve shaft 71 and the stop block 72 are integrally formed in the invention, so that a safer and more reliable fastening mode between the inner anti-cavitation cover 40 and the valve clack 60 is provided. The traditional screw and nut opposite-drawing clamping structure is avoided, the screw and nut matching clamping structure is adopted, when the valve is in the working condition that the pressure difference between an inlet and an outlet of the valve is large and the valve is opened and closed rapidly, the phenomenon that the screw matching is loose can occur due to frequent stress of long-term vibration, so that the screw, the nut and other threaded parts fall into the valve body 10 or the pump body and then are extremely destructive, and the safety performance of the pressure reducing valve 100 can be greatly improved by an integrally formed connecting mode.

The foregoing description of the preferred embodiments of the invention is provided for the purpose of illustration only, and are not intended to limit the invention in any way; those skilled in the art will readily appreciate that the present invention may be implemented as shown in the drawings and described above; however, those skilled in the art will appreciate that many modifications, adaptations, and variations of the present invention are possible in light of the above teachings without departing from the scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the present invention.

Claims

1. The utility model provides a relief pressure valve, the relief pressure valve includes valve body, outer cavitation-proof cover, interior cavitation-proof cover, sealing member, valve clack, valve rod and cavity, the valve body with cavity fixed connection, its characterized in that: the valve rod comprises a valve shaft and a baffle block, the valve shaft and the baffle block are integrally formed, the outer anti-cavitation cover is fixedly arranged in the valve body, the inner anti-cavitation cover is fixed between the baffle block and the valve clack, the valve clack and the baffle block are fixed at the same end of the valve shaft, the other end of the valve shaft is fixed in the valve body, the sealing element is arranged in the valve clack, and the sealing element is propped against the outer anti-cavitation cover and the inner anti-cavitation cover to prevent the sealing element from being separated from the valve clack; the valve clack is provided with a first pressure guide hole which is communicated with the sealing element;

the valve body is internally provided with an inlet end chamber and an outlet end chamber, a control cavity is arranged in the cavity, the control cavity is respectively communicated with the inlet end chamber and the outlet end chamber, and a filter, a second stop valve and a regulating valve are sequentially connected between the inlet end chamber and the control cavity.

2. A pressure relief valve as claimed in claim 1, wherein: the pressure reducing valve further comprises a diaphragm, the cavity comprises an upper cavity cover and a lower cavity cover, the circumferential surface of the outer ring of the diaphragm is fixed between the upper cavity cover and the lower cavity cover, a bulge is arranged at the edge of the upper cavity cover, a groove is arranged at the edge of the lower cavity cover, the bulge is matched with the groove, one side of the diaphragm is propped against the bulge, and the other side of the diaphragm is propped against the groove.

3. A pressure relief valve as claimed in claim 1, wherein: the inner cavitation-proof cover is positioned at the bottom of the valve clack, and an oblong slotted hole is formed in the inner cavitation-proof cover.

4. A pressure relief valve as claimed in claim 2, wherein: the other end of the valve shaft is fixed with a piston, the piston is fixed on the upper cavity cover in a sliding mode, and a second pressure guide hole is formed in the piston.

5. A pressure relief valve as defined in claim 4, wherein: the upper cavity cover is sleeved with a guide sleeve, and the piston slides in the guide sleeve.

6. A pressure relief valve as claimed in claim 1, wherein: an annular groove is formed in the valve clack, and the sealing element is arranged in the annular groove; the number of the first pressure guide holes and the number of the annular grooves are multiple.

7. A pressure relief valve as claimed in claim 1, wherein: the pressure relief valve further includes a filter device secured within the inlet end chamber.

8. A pressure relief valve as claimed in claim 1, wherein: a first stop valve and a pilot valve are sequentially connected between the outlet end chamber and the control chamber; the pressure reducing valve further comprises a hanging ring, and the hanging ring is fixed at one end of the cavity.