A safety valve capable of realizing valve port pressure compensation

Abstract

This invention discloses a safety valve capable of compensating for valve orifice pressure, comprising a valve body, a valve seat, a valve core, and a valve cover. The valve body has a liquid inlet at its first end, and the valve seat has a first channel communicating with the liquid inlet. A first elastic element is disposed between the valve core and the valve cover, and a second elastic element is disposed within a valve cavity receiving groove communicating with the liquid outlet between the valve core and the valve body. A high-pressure drain hole is provided on the valve core. When the pressure of the hydraulic medium entering the valve exceeds a first preset value, the pressure of the hydraulic medium pushes the valve core away from the valve seat, partially opening the second end of the first channel. Simultaneously, the pressure of the hydraulic medium compresses the second elastic element, opening the first end of the high-pressure drain hole. The hydraulic medium flows into the valve cavity, forming back pressure at the liquid outlet, thus compensating for the pressure difference at the liquid outlet, greatly reducing the pressure difference, preventing cavitation, and significantly improving the service life of the safety valve.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic systems, and in particular relates to a safety valve that can realize valve port pressure compensation. Background Technology

[0002] Safety valves are key components of hydraulic systems. Widely used in high-pressure pump stations and hydraulic supports, they are indispensable hydraulic valves for ensuring the normal and stable operation of the hydraulic system of support equipment. They mainly serve to stabilize pressure, control overload, and protect against overflow.

[0003] Currently, safety valves are commonly used in high-pressure, high-flow-rate applications. During operation, the flow of hydraulic medium within the valve is often accompanied by cavitation. When the fluid flows through the valve's throttling orifice or curved flow path, the sudden contraction of the flow cross-section causes a rapid increase in fluid velocity and a rapid decrease in pressure, resulting in cavitation. This significantly shortens the service life of the safety valve. The metal particles shed during cavitation can easily cause valve blockage and lead to hydraulic system failures, which urgently need to be addressed. Summary of the Invention

[0004] The purpose of this invention is to provide a safety valve that can achieve valve port pressure compensation, so as to solve the problem that conventional safety valves in the prior art suffer from cavitation cavitation due to excessive pressure difference between the valve inlet and outlet, resulting in a short service life of the safety valve.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A safety valve capable of compensating for valve orifice pressure includes a valve body, a valve seat, a valve core, and a valve cover, wherein:

[0007] The valve body has a liquid inlet at its first end, and a valve seat is fixed in the valve body near the liquid inlet. The valve seat has a first channel, and the first end of the first channel is connected to the liquid inlet. The valve cover is installed at the second end of the valve body. The valve core is installed in the valve body and located between the valve seat and the valve cover. A first elastic element is provided between the valve core and the valve cover. At least one liquid outlet is opened on the side wall of the valve body. A valve cavity communicating with the liquid outlet is provided between the valve core and the valve body.

[0008] The valve core has a receiving groove on its end face near the valve seat that communicates with the first channel. A second elastic element is disposed within the receiving groove. The valve core has at least one set of high-pressure drainage holes. The first end of each high-pressure drainage hole communicates with the receiving groove, and the second end of each high-pressure drainage hole communicates with the valve cavity.

[0009] Under normal conditions, when the pressure of the hydraulic medium flowing into the first channel is less than the preload of the first elastic element, the valve core abuts against the valve seat to close the second end of the first channel, and the second elastic element closes the first end of all high-pressure drain holes.

[0010] When the pressure of the hydraulic medium flowing into the first channel is greater than a first preset value, the pressure of the hydraulic medium pushes the valve core away from the valve seat to open the second end of the first channel. The hydraulic medium flows into the valve cavity and then flows out from the outlet. At the same time, the pressure of the hydraulic medium compresses the second elastic element, causing the first end of a set of high-pressure drainage holes near the first channel to open. The hydraulic medium flows into the valve cavity through the receiving groove and the high-pressure drainage holes to form back pressure at the outlet for pressure compensation.

[0011] Furthermore, the high-pressure drainage holes are provided in three sets, and the three sets of high-pressure drainage holes are spaced apart along the length direction of the valve core.

[0012] Furthermore, when the pressure of the hydraulic medium in the first channel is greater than the second preset value, the pressure of the hydraulic medium pushes the valve core away from the valve seat, thereby fully opening the second end of the first channel. The hydraulic medium flows into the valve cavity and then flows out from the outlet. At the same time, the pressure of the hydraulic medium compresses the second elastic element, causing the first ends of all the high-pressure drain holes near the first channel to open. The hydraulic medium flows into the four corners of the valve cavity through the receiving groove and the high-pressure drain holes, and together with the hydraulic medium flowing in through the second end of the first channel, they form a counter-current at the valve cavity to perform pressure compensation.

[0013] Furthermore, at least one end of the valve cavity is provided with a buffer step, and the hydraulic medium flowing in through the second end of the first channel and the hydraulic medium flowing in after passing through the high-pressure drain hole are mixed at the buffer step to perform pressure compensation.

[0014] Furthermore, the buffer steps are provided at both ends of the valve cavity.

[0015] Furthermore, the valve body has four outlets, which are spaced apart and located around the circumference of the valve body.

[0016] Furthermore, the valve core has a first protrusion at its end along the axial direction, the valve cover has a second protrusion at its first end along the axial direction, the first elastic element is a buffer spring, and the two ends of the buffer spring are respectively sleeved on the first protrusion and the second protrusion.

[0017] Furthermore, the second end of the valve cover can be detachably mounted on the second end of the valve body via a disassembly assembly.

[0018] Furthermore, the disassembly and assembly assembly includes a first threaded section formed on the valve cover and a second threaded section formed on the inner side of the valve body. The first threaded section and the second threaded section are correspondingly arranged, and the valve cover can be disassembled and assembled at the second end of the valve body through the threaded structure.

[0019] Furthermore, the second end of the valve cover extends out of the end of the valve body, and the second end of the valve body is detachably provided with a locking nut. A third threaded section is provided on the locking nut corresponding to the first threaded section. The locking nut is detachably provided at the extended end of the valve cover through the threaded structure to lock the valve cover into the valve body.

[0020] Compared with existing technologies, the beneficial effects of the safety valve capable of valve port pressure compensation are as follows: When the pressure of the hydraulic medium flowing into the first channel is greater than a first preset value, the pressure of the hydraulic medium pushes the valve core away from the valve seat, opening the second end of the first channel; simultaneously, the pressure of the hydraulic medium compresses the second elastic element, causing the first end of a set of high-pressure drain holes near the first channel to open. The hydraulic medium flows into the valve cavity after passing through the receiving groove and the high-pressure drain holes, forming back pressure at the outlet for pressure compensation, greatly reducing the pressure difference at the outlet, avoiding cavitation and significantly improving the service life of the safety valve; by setting three sets of high-pressure drain holes, when the pressure of the hydraulic medium in the first channel is greater than the second preset value, the hydraulic medium flows into the four corners of the valve cavity after passing through the receiving groove and the high-pressure drain holes, and cooperates with the hydraulic medium flowing into the second end of the first channel to form a counter-pressure at the valve cavity for pressure compensation, further improving the pressure compensation efficiency; through the buffer step, the energy of the high-pressure hydraulic medium can be reduced, the fluid velocity can be reduced, the impact on the internal components of the valve body can be reduced, and damage to the internal components of the valve can be avoided. Attached Figure Description

[0021] To more clearly illustrate and understand the technical solutions in the embodiments of the present invention, the accompanying drawings used in the background technology and embodiment descriptions of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the internal structure of a safety valve capable of compensating valve orifice pressure, provided in an embodiment of the present invention.

[0023] Figure 2This is a three-dimensional structural diagram of a safety valve capable of compensating valve orifice pressure, provided in an embodiment of the present invention. Detailed Implementation

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] To facilitate understanding of the present invention, a more complete description of the invention will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention. It should be noted that when a component is referred to as being "fixed to" another component, it can be directly on the other component or there may be an intermediate component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or there may be an intermediate component. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations. Unless otherwise defined, 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 pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0026] Please see Figure 1 and Figure 2As shown in this embodiment, a safety valve capable of compensating for valve port pressure includes a valve body 1, a valve seat 2, a valve core 3, and a valve cover 4. Specifically: a liquid inlet 10 is provided at the first end of the valve body 1; the valve seat 2 is fixed inside the valve body 1 near the liquid inlet 10; the valve seat 2 has a first channel 20, the first end of which communicates with the liquid inlet 10; the valve cover 4 is installed at the second end of the valve body 1; the valve core 3 is installed inside the valve body 1 and located between the valve seat 2 and the valve cover 4; a first elastic element 5 is provided between the valve core 3 and the valve cover 4; at least one liquid outlet 11 is provided on the side wall of the valve body 1; a valve cavity 12 communicating with the liquid outlet 11 is provided between the valve core 3 and the valve body 1; a receiving groove 32 communicating with the first channel 20 is provided on the end face of the valve core 3 near the valve seat 2; a second elastic element 6 is provided within the receiving groove 32; at least one set of high-pressure drainage holes 30 is provided on the valve core 3; the first end of the high-pressure drainage hole 30 communicates with the receiving groove 30. The two ends of the high-pressure drain holes 30 are connected to the valve cavity 12. Under normal conditions, when the pressure of the hydraulic medium flowing into the first channel 20 is less than the preload of the first elastic element 5, the valve core 3 abuts against the valve seat 2 to close the second end of the first channel 20, and the second elastic element 6 closes the first ends of all the high-pressure drain holes 30. When the pressure of the hydraulic medium flowing into the first channel 20 is greater than the first preset value, the pressure of the hydraulic medium pushes the valve core 3 away from the valve seat 2 to partially open the second end of the first channel 20. The hydraulic medium flows into the valve cavity 12 and then flows out from the outlet 11. At the same time, the pressure of the hydraulic medium compresses the second elastic element 6, causing the first end of a set of high-pressure drain holes 30 near the first channel 20 to open. The hydraulic medium flows into the valve cavity 12 through the receiving groove 32 and the high-pressure drain holes 30 to form back pressure at the outlet 11 for pressure compensation.

[0027] As can be seen, when the pressure of the hydraulic medium flowing into the first channel 20 is greater than the first preset value, the pressure of the hydraulic medium pushes the valve core 3 away from the valve seat 2, opening the second end of the first channel 20. At the same time, the pressure of the hydraulic medium compresses the second elastic element 6, causing the first end of a set of high-pressure drain holes 30 near the first channel 20 to open. The hydraulic medium flows into the valve cavity 12 after passing through the receiving groove 32 and the high-pressure drain holes 30, forming back pressure at the outlet 11 for pressure compensation. This greatly reduces the pressure difference at the outlet 11, avoids the occurrence of cavitation cavitation, and significantly improves the service life of the safety valve.

[0028] In one implementation, three sets of high-pressure drainage holes 30 are provided, and the three sets of high-pressure drainage holes 30 are spaced apart along the length of the valve core 3. When the pressure of the hydraulic medium in the first channel 20 is greater than the second preset value, the pressure of the hydraulic medium pushes the valve core 3 away from the valve seat 2 to fully open the second end of the first channel 20. The hydraulic medium flows into the valve cavity 12 and then flows out from the outlet 11. At the same time, the pressure of the hydraulic medium compresses the second elastic element 6, so that the first end of all the high-pressure drainage holes 30 near the first channel 20 opens. The hydraulic medium flows into the four corners of the valve cavity 12 after passing through the receiving groove 32 and the high-pressure drainage holes 30, and forms a counter-current at the valve cavity 12 with the hydraulic medium flowing in through the second end of the first channel 20 to perform pressure compensation.

[0029] As can be seen, by setting three sets of high-pressure drainage holes 30, when the pressure of the hydraulic medium in the first channel 20 is greater than the second preset value, the hydraulic medium flows into the four corners of the valve cavity 12 after passing through the receiving groove 32 and the high-pressure drainage holes 30. It also forms a counter-current at the valve cavity 12 with the hydraulic medium flowing in through the second end of the first channel 20 to perform pressure compensation, thereby further improving the pressure compensation efficiency.

[0030] In one embodiment, at least one end of the valve cavity 12 is provided with a buffer step 7. The hydraulic medium flowing in through the second end of the first channel 20 and the hydraulic medium flowing in after passing through the high pressure drain hole 30 are mixed at the buffer step 7 to perform pressure compensation.

[0031] Specifically, buffer steps 7 are provided at both ends inside the valve cavity 12.

[0032] It is evident that the buffer step 7 can reduce the energy of the high-pressure hydraulic medium, decrease the fluid velocity, reduce the impact on the internal components of the valve body 1, and prevent damage to the internal components of the valve.

[0033] In one embodiment, four liquid outlets 11 are provided, and the four liquid outlets 11 are spaced apart in the circumference of the valve body 1.

[0034] In one embodiment, the valve core 3 has a first protrusion 31 at its end along the axial direction, the valve cover 4 has a second protrusion 40 at its first end along the axial direction, and the first elastic element 5 is a buffer spring, with the two ends of the buffer spring respectively sleeved on the first protrusion 31 and the second protrusion 40.

[0035] Specifically, the second elastic element 6 is set as a rubber rod.

[0036] In one embodiment, the second end of the valve cover 4 is detachably mounted on the second end of the valve body 1 via a disassembly assembly.

[0037] In one embodiment, the disassembly and assembly assembly includes a first threaded section formed on the valve cover 4 and a second threaded section formed on the inner side of the valve body 1. The first threaded section and the second threaded section are correspondingly arranged, and the valve cover 4 is disassembled and assembled at the second end of the valve body 1 through the threaded structure.

[0038] In one embodiment, the second end of the valve cover 4 extends out of the end of the valve body 1, and the second end of the valve body 1 is detachably provided with a locking nut 8. A third thread section is provided on the locking nut 8 corresponding to the first thread section. The locking nut 8 is detachably provided at the protruding end of the valve cover 4 through the thread structure so as to lock the valve cover 4 into the valve body 1.

[0039] It should be noted that in actual use, once the pressure of the hydraulic medium exceeds the set pressure of the safety valve, the time from closing to opening of the safety valve is extremely short, and the hydraulic medium will cause great damage to the internal components of the valve. The high-pressure drain hole 30 and the buffer step 7 can achieve pressure compensation at the outlet 11, which greatly improves the service life of the safety valve. At the same time, the valve core 3 has a relatively simple structure and high interchangeability, which can meet the needs of different working conditions.

[0040] When the aforementioned safety valve capable of compensating valve orifice pressure is in operation: when the pressure of the hydraulic medium on the valve core 3 is less than the preload of the first elastic element 5, the valve core 3 abuts against the valve seat 2, closing the second end of the first channel 20, and the second elastic element 6 closes the first ends of all high-pressure drain holes 30. At this time, the hydraulic medium continues to be pressurized in the first channel 20; when the pressure of the hydraulic medium is greater than the first preset value, the pressure of the hydraulic medium pushes the valve core 3 away from the valve seat 2, partially opening the second end of the first channel 20, and the hydraulic medium flows into the valve cavity 12 and flows out from the outlet 11. At the same time, the pressure of the hydraulic medium compresses the second elastic element 6, causing the first ends of a set of high-pressure drain holes 30 near the first channel 20 to open, and the hydraulic medium flows out from the outlet 11. The hydraulic medium flows into the valve cavity 12 after passing through the receiving groove 32 and the high-pressure drain hole 30, forming back pressure at the outlet 11 for pressure compensation. When the pressure of the hydraulic medium is greater than the second preset value, the pressure of the hydraulic medium pushes the valve core 3 away from the valve seat 2, fully opening the second end of the first channel 20. The hydraulic medium flows into the valve cavity 12 and then flows out from the outlet 11. At the same time, the pressure of the hydraulic medium compresses the second elastic element 6, causing the first ends of all the high-pressure drain holes 30 near the first channel 20 to open. The hydraulic medium flows into the four corners of the valve cavity 12 after passing through the receiving groove 32 and the high-pressure drain hole 30, and forms a counter-pressure at the valve cavity 12 in conjunction with the hydraulic medium flowing in through the second end of the first channel 20 for pressure compensation.

[0041] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above examples. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety valve capable of achieving valve port pressure compensation, characterized in that, The safety valve capable of realizing valve port pressure compensation comprises a valve body, a valve seat, a valve core and a valve cover, wherein: The first end of the valve body is provided with a liquid inlet, the valve seat is fixed in the valve body close to the liquid inlet, the valve seat is provided with a first channel, the first end of the first channel is communicated with the liquid inlet, the second end of the valve body is provided with the valve cover, the valve core is installed in the valve body and located between the valve seat and the valve cover, the first elastic member is arranged between the valve core and the valve cover, at least one liquid outlet is arranged on the side wall of the valve body, the valve core and the valve body are provided with a valve cavity communicated with the liquid outlet; The end face of the valve core close to the valve seat is provided with a containing groove communicated with the first channel, the second elastic member is arranged in the containing groove, at least one group of high-pressure drainage holes are arranged on the valve core, the first end of the high-pressure drainage hole is communicated with the containing groove, and the second end of the high-pressure drainage hole is communicated with the valve cavity, In the normal state, when the pressure of the hydraulic medium flowing into the first channel is less than the pre-tightening force of the first elastic member, the valve core abuts against the valve seat to close the second end of the first channel, and the second elastic member seals the first end of all high-pressure drainage holes; When the pressure of the hydraulic medium flowing into the first channel is greater than the first preset value, the valve core is pushed away from the valve seat by the pressure of the hydraulic medium to partially open the second end of the first channel, the hydraulic medium flows into the valve cavity and then flows out of the liquid outlet, and the second elastic member is compressed by the pressure of the hydraulic medium to open the first end of a group of high-pressure drainage holes close to the first channel, so that the hydraulic medium flows into the valve cavity through the containing groove and the high-pressure drainage hole to form back pressure at the liquid outlet and realize pressure compensation, and the second elastic member is a rubber rod; The high-pressure drainage hole is provided with three groups, and the three groups of high-pressure drainage holes are arranged at intervals along the length direction of the valve core; When the pressure of the hydraulic medium flowing into the first channel is greater than the second preset value, the valve core is pushed away from the valve seat by the pressure of the hydraulic medium to completely open the second end of the first channel, the hydraulic medium flows into the valve cavity and then flows out of the liquid outlet, and the second elastic member is compressed by the pressure of the hydraulic medium to open the first end of all high-pressure drainage holes close to the first channel, so that the hydraulic medium flows into the four corners of the valve cavity through the containing groove and the high-pressure drainage hole and cooperates with the hydraulic medium flowing into the valve cavity through the second end of the first channel to form a collision at the valve cavity and realize pressure compensation.

2. The valve that can realize the safety valve of port pressure compensation according to claim 1, its characterized in that, At least one end of the valve cavity is provided with a buffer step, and the hydraulic medium flowing into the valve cavity through the second end of the first channel and the hydraulic medium flowing into the valve cavity through the high-pressure drainage hole are mixed at the buffer step to realize pressure compensation.

3. The valve that can achieve the valve port pressure compensation safety valve according to claim 2, characterized in that, Both ends of the valve cavity are provided with the buffer step.

4. The valve that can achieve the valve port pressure compensation safety valve according to claim 1, characterized in that, The liquid outlet is provided with four liquid outlets, and the four liquid outlets are arranged at intervals in the circumferential direction of the valve body.

5. The valve port pressure compensated safety valve of claim 1, wherein, The end of the valve core is provided with a first protruding part in the axial direction, the first end of the valve cover is provided with a second protruding part in the axial direction, the first elastic member is a buffer spring, and the two ends of the buffer spring are sleeved on the first protruding part and the second protruding part respectively.

6. The valve port pressure compensated safety valve of claim 1, wherein, The second end of the valve cover is detachably mounted on the second end of the valve body through a detachable assembly.

7. The valve that can achieve the valve port pressure compensation safety valve according to claim 6, characterized in that, The detachable assembly comprises a first threaded section formed on the valve cover and a second threaded section formed on the inner side of the valve body, the first threaded section is correspondingly arranged with the second threaded section, and the valve cover is detachably mounted on the second end of the valve body through the threaded structure.

8. The valve that can achieve the valve port pressure compensation safety valve according to claim 7, characterized in that, The second end of the valve cover is arranged to protrude from the end of the valve body, the second end of the valve body is detachably provided with a locking nut, a third threaded section is formed on the locking nut corresponding to the first threaded section, and the locking nut is detachably arranged on the protruding end of the valve cover through the threaded structure to lock the valve cover in the valve body.

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