Anti-blocking pressure release valve

Abstract

The utility model discloses an anti-blocking pressure release valve, which belongs to the technical field of safety devices and comprises a valve body, a valve core, a filter and an elastic clamp. The valve body is provided with a fluid channel, a pressure relief channel and a valve port communicated with the fluid channel and the pressure relief channel. A valve element is arranged at the position of the valve port and used for opening or closing the valve port. The filter is located at the position of the valve port and used for preventing foreign matter in the fluid channel from flowing towards the valve element. The elastic clamp is detachably installed on the valve body, located at the position of the valve port and used for fixing the filter. According to the pressure relief valve, the filter is additionally arranged in the pressure relief valve, fluid media flowing through the pressure relief valve can be filtered, and the problems that the valve element is clamped by foreign matter in the fluid media, a valve port is closed abnormally, and then the internal pressure of a system is unstable are solved. The filter is fixed by arranging the elastic clamp, so that convenience is provided for disassembly and replacement of the filter.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of safety device, and relates to a pressure relief valve, specifically, a pressure relief valve with a filter element built-in. BACKGROUND

[0002] The pressure relief valve is a safety device, usually installed on the equipment or pipeline of a closed system, and mainly functions to ensure that the pressure of the medium in the system does not exceed the limit, so as to prevent accidents. At present, the pressure relief valve has been widely used in various systems requiring pressure control, such as water supply systems, hydraulic systems, engine lubrication systems, etc., to ensure the safe and stable operation of the system.

[0003] In the engine lubrication system, the pressure relief valve is usually installed in the main oil pipeline through which the engine oil (lubricating oil) circulates. When the pressure in the main oil pipeline exceeds the set threshold, the pressure relief valve will automatically open its valve port to release part of the engine oil, thereby reducing the system pressure. When the pressure in the main oil pipeline returns to the normal range, the pressure relief valve will automatically close its valve port to stop pressure relief, thereby ensuring the normal operation of the engine.

[0004] When the engine oil flows through the pressure relief valve, if foreign matter is mixed in the engine oil, the foreign matter will flow with the engine oil to the valve port position of the pressure relief valve. If the volume of the foreign matter is large, it will jam the valve port, causing the valve port to fail to normally close, which in turn leads to abnormal engine pressure and easily causes safety accidents. SUMMARY

[0005] The utility model discloses a kind of anti-jamming pressure relief valves to solve at least part of the technical problems existing in the background art, by optimizing the internal structure of pressure relief valve, it has filtering capacity, by preventing foreign matter flow, to ensure that valve port normally opens and closes.

[0006] To solve the above technical problems, the utility model adopts the following technical solutions to achieve:

[0007] A kind of anti-jamming pressure relief valve, comprising:

[0008] Valve body, fluid passage, pressure relief passage, valve port being communicated with the fluid passage and pressure relief passage are set on it;

[0009] Valve core, for opening or closing the valve port, is arranged at the valve port position;

[0010] Filter, for preventing foreign matter in fluid passage from flowing to the valve core, is located at the valve port position;

[0011] Elastic clip, for fixing the filter, is detachably mounted on the valve body and located at the valve port position.

[0012] In some embodiments of the present application, a valve cavity can be formed in the valve body, one end of the valve cavity is communicated with the pressure relief channel, and the other end is provided with a gasket, a through hole is formed in the gasket, so that the valve cavity is communicated with the outside through the through hole in the gasket, the air pressure in the valve cavity is kept constant, and the normal movement of the valve core is not affected. A spring can be installed in the valve cavity, and the spring is used to apply pressure to the valve core to control the valve core to block the valve port. By configuring the spring force, the opening pressure of the valve port can be adjusted.

[0013] In some embodiments of the present application, the valve core can be designed as a shell structure including a top cover and a peripheral wall. The top cover is arranged in the valve port adjacent to the elastic clamp and is used to block or open the valve port. The peripheral wall is designed as a cylinder, one end of which is connected to the top cover, and the other end extends into the valve cavity and is in close contact with the inner wall of the valve cavity to prevent the pressure relief medium from entering the valve cavity. The peripheral wall of the valve core transversely passes through the pressure relief channel, and during the period when the top cover blocks the valve port, the peripheral wall blocks the pressure relief port, thereby effectively preventing abnormal pressure relief.

[0014] In some embodiments of the present application, the outer edge of the top cover of the valve core is configured to form an inclined surface inclined outwardly to the peripheral wall of the valve core. Even if a small amount of impurities passes through the filter to reach the valve core, the impurities can also enter the pressure relief channel through the inclined surface under the action of gravity and be discharged from the valve body with the pressure relief medium, without being stuck at the valve port position to affect the internal pressure of the system.

[0015] In some embodiments of the present application, one end of the spring extends into the cavity surrounded by the peripheral wall of the valve core and abuts against the top cover of the valve core, so as to improve the stability of the assembly of the valve core and the spring. The other end of the spring abuts against the gasket, so as to facilitate disassembly or replacement of the spring.

[0016] In some embodiments of the present application, the gasket is detachably mounted at the end of the valve body, so that when the filter needs to be cleaned or replaced, the gasket, the spring and the valve core can be disassembled from the end of the valve body to expose the elastic clamp. Thus, the elastic clamp can be retracted by a tool and then removed from the valve body, and the filter can be removed for cleaning or replacement.

[0017] In some embodiments of the present application, when the pressure relief channel is formed with a plurality of pressure relief branches in the valve body, the peripheral wall of the valve core is arranged at the intersection of the plurality of pressure relief branches, so that during the period when the top cover of the valve core blocks the valve port, the peripheral wall of the valve core can block all the pressure relief ports.

[0018] In some embodiments of the present application, in order to facilitate the contraction of the elastic clamp, the elastic clamp can be designed as a ring with a notch, including oppositely positioned upper and lower ring surfaces, the upper ring surface is configured to face the fluid passage, and the lower ring surface is configured to face the valve core, the filter is placed on the upper ring surface of the elastic clamp, the filter is carried by the elastic clamp, and the positioning of the filter in the valve body is achieved.

[0019] In some embodiments of the present application, the filter can be a circular filter screen or filter plate, and the diameter thereof is between the inner and outer diameters of the elastic clamp, so that the filter can be reliably carried on the elastic clamp.

[0020] In some embodiments of the present application, in order to reliably and detachably install the elastic clamp in the valve body, a stepped ring groove can be formed in the valve body, including an upper ring groove and a lower ring groove, the size of the upper ring groove is matched with the diameter of the filter, and the size of the lower ring groove is matched with the outer diameter of the elastic clamp; the elastic clamp is installed in the lower ring groove, the filter is carried by the upper ring surface of the elastic clamp and is limited in the upper ring groove, so that the filter is fixed in the valve body, and the detachable assembly of the filter in the valve body is achieved.

[0021] In some embodiments of the present application, in order to contract the elastic clamp for disassembly, two widened heads extending inwardly in the direction of the ring can be formed at the notch position of the elastic clamp, and operation holes are respectively formed on the two widened heads for the insertion and positioning of a clamp pliers, and then the disassembly of the elastic clamp is performed.

[0022] Compared with the prior art, the advantages and positive effects of the present application mainly lie in:

[0023] 1. By adding a filter in the pressure relief valve, the fluid medium flowing through the pressure relief valve can be filtered to remove foreign matter, avoid the foreign matter from blocking the valve core, cause abnormal closing of the valve port, and cause problems such as unstable internal pressure of the system.

[0024] 2. The filter is fixed in the valve body of the pressure relief valve by the elastic clamp, which not only ensures the reliability of the assembly of the valve body and the filter, but also facilitates the replacement of the filter and reduces the maintenance cost of the pressure relief valve.

[0025] 3. The filter function is realized on the pressure relief valve, and the pressure relief valve with filtering capacity is installed in the engine lubricating system, which not only effectively purifies the oil and prevents the engine pressure from being abnormal due to the foreign matter blocking the pressure relief valve, affecting the normal operation of the engine, but also blocks the flow of foreign matter in the engine lubricating system, ensuring the safe and stable operation of the system.

[0026] 4. The pressure relief valve has simple structure, convenient installation, reliable work, low cost and is suitable for being applied to various pressure control systems.

[0027] Other features and advantages of the present application will become more apparent after reading the detailed description of the preferred embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings described in the following are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0029] Figure 1 is a whole structure schematic view of an embodiment of the anti-jamming pressure relief valve shown in the figure;

[0030] Figure 2 is a structure exploded view of an embodiment of the anti-jamming pressure relief valve shown in the figure; Figure 1

[0031] Figure 3 is a whole structure schematic view of an embodiment of the valve body in the figure; Figure 2

[0032] Figure 4 is an A-A cross-sectional view of an embodiment of the valve body shown in the figure; Figure 3

[0033] Figure 5 is a whole structure schematic view of an embodiment of the filter in the figure; Figure 2

[0034] Figure 6 is a structure schematic view of an embodiment of the elastic clamp in the figure; Figure 2

[0035] Figure 7 is a cross-sectional view of an embodiment of the anti-jamming pressure relief valve shown in the figure; Figure 1

[0036] Figure 8 is a structure schematic view of the anti-jamming pressure relief valve in the pressure relief state shown in the figure; Figure 7

[0037] Figure 9 is an operation schematic view of an embodiment of replacing the filter in the valve body.

[0038] ​​​​​​​In the figure, 100, valve body; 110, head; 120, stem; 121, waist; 122, upper section; 123, lower section; 130, fluid passage; 131, inlet and outlet; 140, pressure relief passage; 141, pressure relief port; 150, valve port; 151, upper part; 152, lower part; 160, valve cavity; 161, opening; 162, mounting groove; 170, stepped ring groove; 171, upper ring groove; 172, lower ring groove; 200, valve core; 210, top cover; 211, inclined surface; 220, peripheral wall; 300, filter; 400, elastic clamp; 410, notch; 420, upper annular surface; 430, lower annular surface; 440, head; 441, operation hole; 500, spring; 600, washer; 610, washer hole. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0040] In the description of the present application, it should be understood that the terms "upper", "lower", "intermediate", "inner", "outer", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed or operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0041] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or internal communication of components. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In the description of the embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0042] In the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0043] In combination with Figure 1 , Figure 2 It is shown that the pressure relief valve of the present embodiment includes a valve body 100, a valve core 200, a filter 300, an elastic clamp 400, a spring 500 and the like.

[0044] The valve body 100 can be designed as a screw-like structure, as shown in Figure 3 including a head 110 and a stem 120.

[0045] The head 110 can be designed as a polygonal structure to facilitate the operator to hold the valve body 100 and install or remove the pressure relief valve on the system pipeline.

[0046] The stem 120 can be provided with a fluid passage 130 and a pressure relief passage 140, as shown in Figure 4 In some embodiments, the fluid passage 130 can form multiple fluid passages in the valve body 100, and then form multiple inlets and outlets 131 on the stem 120 of the valve body, which can be used for fluid medium to flow in or out, as shown in Figure 3 That is, a single-input multiple-output pressure relief valve or a multiple-input multiple-output pressure relief valve is formed to meet the actual working condition requirements of different systems. For systems that only need to use a single-input single-output pressure relief valve, the excess inlets and outlets 131 can be plugged with a plug to meet the use requirements of the system.

[0047] Similarly, the pressure relief passage 140 can also form multiple pressure relief passages in the valve body 100, and then form multiple pressure relief outlets 141 on the stem 120 of the valve body, which can be used for fluid medium to flow out when pressure relief, as shown in Figure 3 to speed up the pressure relief speed.

[0048] In order to facilitate the operator to clearly distinguish the fluid passage 130 and the pressure relief passage 140 and avoid confusion, a convex waist 121 can be formed at the middle position of the length direction of the stem 120, which divides the stem 120 into upper and lower two sections. The upper section 122 can be provided with the fluid passage 130, which is installed on the system pipeline during use and used for the fluid medium (such as oil, etc.) in the system to pass through. The lower section 123 can be provided with the pressure relief passage 140, which discharges part of the fluid medium when the pressure in the system exceeds the set threshold to maintain the stable pressure in the system.

[0049] Referring to Figure 4 , the valve body 100 is provided with a valve port 150, which communicates the fluid passage 130 and the pressure relief passage 140, so that the fluid medium in the fluid passage 130 can flow into the pressure relief passage 140 through the valve port 150 when pressure relief, thereby achieving pressure relief.

[0050] In some embodiments, the valve port 150 can be formed in the waist portion 121 of the valve body 100, and can be divided into an upper portion and a lower portion, and the upper portion and the lower portion can be through each other. The upper portion 151 is connected to the fluid passage 130, and is used to install the filter 300 and the elastic clamp 400. The lower portion 152 is connected to the pressure relief passage 140, and is used to install the valve core 200. By changing the position of the valve core 200, the opening degree of the valve port 150 can be adjusted, and then the pressure relief amount of the system can be controlled.

[0051] In the valve body 100, a valve cavity 160 is also formed, as shown in Figure 4 The valve cavity 160 can be disposed on opposite sides of the pressure relief passage 140 from the valve port 150, and the valve cavity 160 is used to install a spring 500. The spring 500 is used to adjust the opening pressure of the valve port 150 by the elastic force of the spring 500. The greater the elastic force of the spring 500, the greater the opening pressure of the valve port 150.

[0052] In some embodiments, the valve cavity 160 can be formed through one end of the valve body 100, for example, through the bottom of the valve body 100, that is, the opening 161 is formed at the end of the stem portion 120 away from the head portion 110, and a mounting groove 162 can be formed at the opening 161 to install a gasket 600. The gasket 600 is detachably assembled with the stem portion 120 of the valve body 100, so that the filter 300 in the valve body 100 can be replaced later.

[0053] In the present embodiment, the filter 300 can use a filter screen or a filter plate to filter foreign matter in the fluid medium, as shown in Figure 5 The filter screen or the filter plate can be designed in a circular shape, and is fixed in the valve body 100 by the elastic clamp 400.

[0054] In some embodiments, the elastic clamp 400 can be designed in an annular shape with a notch 410, as shown in Figure 6 The size of the notch 410 is configured to adjust the expansion amount of the elastic clamp 400.

[0055] The elastic clamp 400 of the present embodiment has an upper annular surface 420 and a lower annular surface 430 opposite to each other. The inner diameter of the elastic clamp 400 is configured to be smaller than the diameter of the circular filter screen or the filter plate, and the outer diameter of the elastic clamp 400 is configured to be larger than the diameter of the circular filter screen or the filter plate. In this way, the circular filter screen or the filter plate can be placed on the upper annular surface 420 of the elastic clamp 400, and the filter 300 is carried by the elastic clamp 400 and positioned in the valve body 100.

[0056] Specifically, in order to detachably install the filter 300 and the elastic clamp 400, a stepped annular groove 170 can be formed in the valve body 100, as shown in Figure 4As shown, the stepped ring groove 170 can be specifically formed in the region where the upper part 151 of the valve port is located. The stepped ring groove 170 is configured as a two-step ring groove, including an upper ring groove 171 and a lower ring groove 172. The upper ring groove 171 is closer to the fluid passage 130 than the lower ring groove 172. The upper ring groove 171 is configured to have a size suitable for the diameter of the circular filter screen or filter plate, and the lower ring groove 172 is configured to have a size suitable for the outer ring diameter of the elastic clamp 400. The filter 300 is installed in the upper ring groove 171, the upper annular surface 420 of the elastic clamp 400 is directed towards the fluid passage 130, the lower annular surface 172 is directed towards the valve core 200, the elastic clamp 400 is contracted, and the elastic clamp 400 is positioned in the lower ring groove 172. Then, the elastic clamp 400 is loosened to stretch back to normal, and is clamped in the lower ring groove 172. In this way, the filter 300 can be fixed in the valve body 100 under the bearing and limiting action of the elastic clamp 400, and foreign matter in the fluid medium flowing to the valve port 150 is filtered out to avoid the foreign matter flowing to the valve core 200, causing the valve core 200 to be stuck and unable to normally close the valve port 150, and then causing problems such as abnormal internal pressure of the system to occur.

[0057] In some embodiments, the valve port 150, the valve cavity 160, and the central axis of the valve body 100 can be coaxial, and the inner diameters of the valve port 150 and the valve cavity 160 are greater than the outer diameter of the filter 300. In this way, when the filter 300 is installed, the filter 300 can be inserted from the bottom opening 161 of the valve body 100, sequentially pass through the valve cavity 160, the pressure relief passage 140, and part of the valve port 150, and be installed in the upper ring groove 171. Similarly, the elastic clamp 400 can also be inserted from the bottom opening 161 of the valve body 100, sequentially pass through the valve cavity 160, the pressure relief passage 140, and part of the valve port 150, and be installed in the lower ring groove 171. The upper annular surface 420 of the elastic clamp 400 bears the filter 300 and limits the filter 300 in the upper ring groove 171, achieving detachable assembly of the filter 300 in the valve body 100.

[0058] In order to facilitate the contraction of the elastic clamp 400, the two ends of the elastic clamp 400 at the notch 410 position can be configured as two widened heads 440 extending inwards in the ring direction, as shown in Figure 6 An operation hole 441 for inserting a tool is formed on each of the two widened heads 440.

[0059] When the filter 300 needs to be replaced, the gasket 600 at the bottom of the valve body 100 is first removed to expose the valve cavity 160. Then, the spring 500 in the valve cavity 160 is removed to expose the valve core 200. Next, the valve core 200 is removed through the valve cavity 160 to expose the elastic clamp 400, as shown in Figure 9The spring clip is then inserted into the valve cavity 160 and the two jaws of the spring clip are inserted into the two operation holes 441 of the elastic clip 400. The spring clip is operated to contract the elastic clip 400 so that the outer ring diameter of the elastic clip 400 is smaller than the diameter of the lower ring groove 172, and the elastic clip 400 is then taken out of the valve body 100. Without the bearing and limiting of the elastic clip 400, the filter 300 can be taken out of the valve body 100 for cleaning or replacement.

[0060] The use of the elastic clip 400 to fix the filter 300 can accelerate the disassembly and replacement of the filter 300, thereby improving the maintenance efficiency of the pressure relief valve.

[0061] In order to control the valve port 150 to be closed when the internal pressure of the system is normal and to be opened when the internal pressure of the system is too high, the valve core 200 is arranged in the valve port 150 in this embodiment to open or close the valve port 150.

[0062] In combination Figure 2 , Figure 7 In some embodiments, the valve core 200 can be installed in the lower part 152 of the valve port 150 adjacent to the lower annular surface 430 of the elastic clip 400. The fluid medium filtered by the filter 300 can pass through the inner ring hole of the elastic clip 400 to the position of the valve core 200, and flow into the pressure relief channel 140 to achieve the purpose of reducing the internal pressure of the system when the valve core 200 opens the valve port 150.

[0063] In some embodiments, the valve core 200 can be designed as a shell structure, as shown in Figure 7 including a top cover 210 and a peripheral wall 220.

[0064] The top cover 210 is arranged in the valve port 150, and specifically can be arranged in the lower part 152 of the valve port 150 adjacent to the lower annular surface 430 of the elastic clip 400 arranged in the upper part 151 of the valve port 150. The outer edge of the top cover 210 can be designed as an inclined surface 211, as shown in Figure 2 The inclined surface 211 is arranged to be inclined outward from the top cover 210 to the peripheral wall 220. In this way, when the system is depressurized, even if a small volume of foreign matter mixed in the fluid medium passes through the filter 300 and reaches the position of the valve core 200, the foreign matter can also fall into the pressure relief channel 140 under the action of its own gravity via the inclined surface 211 of the top cover 210, and then be discharged out of the valve body 100 with the depressurized medium (the fluid medium entering the pressure relief channel 140), without causing the problem of the foreign matter being stuck in the valve core 200.

[0065] In some embodiments, the shape and size of the lower part 152 of the valve port 150 can be configured to match the outer contour shape and size of the top cover 210, the inclined surface 211 and the peripheral wall 220 of the valve core 200, so that the lower part 152 of the valve port 150 can be completely blocked by the top cover 210 when the internal pressure of the system is normal, to prevent pressure leakage.

[0066] The peripheral wall 220 of the valve core 200 can be designed in a cylindrical shape, one end of which is connected to the top cover 210, and the other end extends away from the valve port 150 and crosses the pressure relief passage 140, which is used to block the pressure relief passage 140 when the internal pressure of the system is normal.

[0067] For the case where multiple pressure relief branches are formed in the valve body 100, the peripheral wall 220 of the valve core 200 can be configured at the intersection of the multiple pressure relief branches, so that all the pressure relief ports 141 on the valve body 100 can be blocked by the peripheral wall 220 of the valve core 200 during the normal internal pressure of the system.

[0068] In this embodiment, the top cover 210 of the valve core 200 blocks the valve port 150, and the peripheral wall 220 of the valve core 200 blocks the pressure relief port 141 during the normal internal pressure of the system, and the cooperation of the top cover 210 and the peripheral wall 220 can completely eliminate the problem of abnormal pressure leakage of the system.

[0069] In some embodiments, the end of the peripheral wall 220 of the valve core 200 away from the valve port 150 can extend into the valve cavity 160 and fit with the inner wall of the valve cavity 160, to prevent the fluid medium flowing into the pressure relief passage 140 from entering the valve cavity 160.

[0070] The spring 500 is installed in the valve cavity 160, one end of the spring 500 extends into the cavity surrounded by the peripheral wall 220 of the valve core 200 and abuts against the top cover 210 of the valve core 200, and the other end of the spring 500 abuts against the gasket 600 installed at the bottom of the valve cavity 160, and the opening pressure of the valve port 150 can be adjusted by configuring the elastic force of the spring 500.

[0071] In this embodiment, the gasket 600 is installed in the installation groove 162 at the bottom of the valve cavity 160, and a through hole, which can be referred to as a gasket hole 610, is formed in the gasket 600. When the valve core 200 moves and causes the volume of the valve cavity 160 to change, the pressure in the valve cavity 160 will not change due to the change in its volume because the valve cavity 160 is connected to the outside through the gasket hole 610 in the gasket 600, and thus the movement of the valve core 200 will not be affected.

[0072] Industrial applicability

[0073] The pressure relief valve of this embodiment is applied in an engine lubrication system as an example.

[0074] First, the fluid passage 130 of the pressure relief valve is connected to the main oil line of the engine lubrication system, and an oil return pipe is connected at the pressure relief port 141 of the pressure relief valve, which is connected to the crankcase to recover the oil.

[0075] The pressure relief threshold is determined according to the normal pressure range of the engine lubrication system, and the spring force of the spring 500 is configured according to the pressure relief threshold.

[0076] During the operation of the engine lubrication system, the oil flows in the main oil line, and when passing through the fluid passage 130 of the pressure relief valve, most of the oil continues to flow downstream in the main oil line through the pressure relief valve, and a small part of the oil enters the valve port 150 of the pressure relief valve, passes through the filter 300 in the valve port 150 to filter out foreign matter therein, reaches the valve core 200, and is stopped by the valve core 200.

[0077] When the pressure in the engine lubrication line rises and is greater than the spring force of the spring 500 in the pressure relief valve, the valve core 200 moves towards the valve cavity 160, compresses the spring 500, and opens the valve port 150 (the greater the pressure in the main oil line, the greater the opening degree of the valve port 150), as shown in FIG. 4, so that the oil in the valve port 150 is stopped and flows into the pressure relief passage 140, forming pressure relief oil, which then flows into the crankcase through the oil return pipe. Figure 8

[0078] After the valve port 150 of the pressure relief valve is opened, the pressure in the main oil line is released through the pressure relief valve, so that the pressure in the main oil line is reduced, the spring 500 rebounds, drives the valve core 200 to move towards the valve port 150, and reduces the opening degree of the valve port 150. When the pressure in the main oil line returns to the normal range, the valve core 200 returns to the initial position, completely blocks the valve port 150, and ensures the normal operation of the lubrication system.

[0079] The pressure relief valve of the embodiment has simple structure and reliable operation, and can be widely applied in the hydraulic systems of engineering machinery, metallurgical equipment, ships, automobiles and other fields, so as to protect the hydraulic system from overpressure and ensure the safe operation of the system and the normal work of the equipment.

[0080] Of course, the above embodiment is only used to illustrate the technical scheme of the utility model, but not to limit it; although the utility model has been described in detail with reference to the foregoing embodiment, the technical scheme recorded in the foregoing embodiment can still be modified or some technical features can be replaced by equivalents for the skilled in the art; and these modifications or replacements do not make the essence of the corresponding technical scheme deviate from the spirit and scope of the technical scheme claimed by the utility model.​

Claims

1. A stick prevention pressure relief valve, characterized by, The valve body is provided with a fluid passage, a pressure relief passage, and a valve port connecting the fluid passage and the pressure relief passage. The valve core is arranged at the valve port position to open or close the valve port. The filter is arranged at the valve port position to prevent foreign matter in the fluid passage from flowing to the valve core. The elastic clip is detachably mounted on the valve body and arranged at the valve port position to fix the filter.

2. The anti-jamming pressure relief valve according to claim 1, wherein a valve cavity is further formed in the valve body, one end of the valve cavity is connected to the pressure relief passage, and a gasket is mounted at the other end of the valve cavity, the gasket is provided with a through hole, and the valve cavity is connected to the outside through the through hole of the gasket. A spring is mounted in the valve cavity, and the spring applies pressure to the valve core to control the valve core to block the valve port. The valve core comprises: A top cover is arranged in the valve port adjacent to the elastic clip.

3. The anti-seize pressure relief valve of claim 2, wherein, A peripheral wall is in a cylindrical shape, one end of the peripheral wall is connected to the top cover, the other end of the peripheral wall extends into the valve cavity and is in close contact with the inner wall of the valve cavity, and the peripheral wall transversely passes through the pressure relief passage. An outer edge of the top cover forms an inclined surface inclined outwardly toward the peripheral wall. One end of the spring extends into a cavity formed by the peripheral wall of the valve core and abuts against the top cover of the valve core, and the other end of the spring abuts against the gasket.

4. The anti-seize pressure relief valve of claim 3, wherein, The gasket is detachably mounted on the end of the valve body.

5. The anti-seize pressure relief valve of claim 3, wherein, The pressure relief passage is formed with a plurality of pressure relief branches in the valve body, and the peripheral wall of the valve core is arranged at the intersection of the plurality of pressure relief branches.

6. The anti-seize pressure relief valve of claim 5, wherein, 8. The anti-jamming pressure relief valve according to any one of claims 1 to 7, wherein the elastic clip is an annular ring with a notch, comprising oppositely arranged upper and lower annular surfaces, the upper annular surface faces the fluid passage, and the lower annular surface faces the valve core.

7. The anti-seize pressure relief valve of claim 3, wherein, The filter is arranged on the upper annular surface of the elastic clip.

9. The anti-jamming pressure relief valve according to claim 8, wherein the filter is a circular filter screen or filter plate with a diameter between the inner and outer diameters of the elastic clip. A stepped annular groove is formed in the valve body, the stepped annular groove comprises an upper annular groove and a lower annular groove, the size of the upper annular groove is matched with the diameter of the filter, and the size of the lower annular groove is matched with the outer diameter of the elastic clip. The elastic clip is mounted in the lower annular groove, the upper annular surface of the elastic clip bears the filter and limits the filter in the upper annular groove. Two widened heads extending inwardly in the annular direction are formed at the notch position of the elastic clip, and operation holes are respectively formed in the two widened heads. ​ ​ ​ 10. The anti-seize pressure relief valve of claim 8, wherein, ​

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