Pressure release valve with built-in filter element

Abstract

The utility model discloses a pressure release valve with a built-in filter element, which belongs to the technical field of safety devices and comprises a valve body, a valve element and a filter component. 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 assembly comprises a filter main body and a filter screen, the filter main body is installed in the valve body and intersects with the fluid channel, and a drainage channel communicated with the fluid channel and the valve port is formed in the filter main body; the filter screen is installed on the filter body, located in the fluid channel and used for filtering foreign matter in the fluid channel and preventing the foreign matter from flowing towards the valve port. According to the pressure relief valve, the filter assembly is additionally arranged in the pressure relief valve, fluid media flowing through the pressure relief valve can be filtered, and the problems that foreign matter in the fluid media is clamped at the position of a valve port, the valve port is closed abnormally, and then the pressure in a system is unstable are solved.

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 applied 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, so as to reduce 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, so as to ensure the normal operation of the engine.

[0004] When the engine oil flows through the pressure relief valve, if there are foreign matters mixed in the engine oil, the foreign matters will flow with the engine oil to the valve port position of the pressure relief valve. If the volume of the foreign matters is large, the valve port will be blocked, so that the valve port cannot be normally closed, which will cause problems such as unstable oil pressure in the lubrication system, and there will be a safety hazard. SUMMARY

[0005] In order to solve at least part of the above technical problems existing in the background art, the utility model provides a pressure relief valve with a filter element built-in, which has a filtering capacity by optimizing the internal structure of the pressure relief valve, so as to ensure the normal opening and closing of the valve port by preventing the flow of foreign matters.

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

[0007] A pressure relief valve with a filter element built-in, comprising:

[0008] a valve body, a fluid passage, a pressure relief passage, and a valve port communicating the fluid passage and the pressure relief passage are formed in the valve body;

[0009] a valve core, configured at the valve port position, for opening or closing the valve port;

[0010] a filter assembly for preventing the flow of foreign matters in the fluid passage to the valve port, comprising:

[0011] a filter body, installed in the valve body and transversing the fluid passage, and a drainage passage communicating the fluid passage and the valve port is formed in the filter body;

[0012] A filter screen is installed on the filter body and located in the fluid channel to filter foreign matters in the fluid channel.

[0013] In some embodiments of the present application, a mounting portion, a base and a support column can be arranged in the filter body; the mounting portion is preferably detachably mounted on the valve body to facilitate replacement of the filter assembly; the base can be designed in a ring shape and mounted in the valve port; through the mounting cooperation of the base and the mounting portion in the valve body, the stability of the assembly of the filter assembly in the valve body can be improved; the support column is mounted between the mounting portion and the base and arranged in the fluid channel, and the filter screen is mounted on the support column, so that the fluid medium in the fluid channel can flow through the filter screen, and then the foreign matters in the fluid medium are effectively filtered out.

[0014] In some embodiments of the present application, a plurality of support columns can be arranged, and the plurality of support columns are arranged in a circumferential interval between the mounting portion and the base, i.e., surrounding a circle, to improve the reliability of the assembly of the filter screen on the support columns. Since the plurality of support columns are arranged in a circumferential interval, the interval region formed between the adjacent two support columns and the inner ring hole of the base can form a drainage channel, so that after the fluid medium in the fluid channel is filtered by the filter screen to remove the foreign matters, the fluid medium can smoothly enter the valve port through the drainage channel to achieve pressure relief.

[0015] In some embodiments of the present application, the filter screen can be surrounded in a cylindrical shape and sleeved on the outer periphery of the plurality of support columns to improve the filtering effect.

[0016] In some embodiments of the present application, in order to simplify the disassembly and assembly operation of the filter assembly in the valve body, an external thread can be formed on the mounting portion of the filter body, and a threaded hole is formed in the valve body, and the mounting portion of the filter body is threadedly connected to the threaded hole of the valve body, so that the mounting operation of the filter assembly in the valve body is completed, which is simple and fast.

[0017] In some embodiments of the present application, in order to solve the disassembly and assembly problem of the filter assembly in actual use, an operation hole can be formed in the inside of the mounting portion of the filter body for insertion of a disassembly and assembly tool, and the filter assembly is rotated by the disassembly and assembly tool to be threadedly connected to the threaded hole of the valve body; the operation hole is aligned with the drainage channel of the filter body to allow the disassembly and assembly tool to pass through and then reach the operation hole position to perform the disassembly and assembly operation.

[0018] In some embodiments of the present application, the threaded holes and valve ports can be distributed on opposite sides of the fluid passage, so that the filter assembly can cross the fluid passage; when the fluid passage is formed with multiple flow branches in the valve body, the filter assembly is arranged at the intersection of the multiple flow branches, so that the fluid medium must flow through the filter screen regardless of the direction, thereby effectively filtering out foreign matter in the fluid medium.

[0019] 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 can be arranged in the valve port adjacent to the base of the filter body, and is used to block or open the valve port; the peripheral wall can be designed as a cylinder, one end of which is connected to the top cover, and the other end extends away from the valve port and crosses the pressure relief passage; during the blocking of the valve port by the top cover, the peripheral wall blocks the pressure relief port, thereby effectively avoiding abnormal pressure relief.

[0020] In some embodiments of the present application, the valve port can be designed as a funnel, including a straight cylinder section and an outward section; the straight cylinder section is arranged to communicate with the fluid passage and is used to assemble the base of the filter body; the outward section is arranged to communicate with the pressure relief passage and is used to assemble the top cover of the valve core; the outer edge of the top cover of the valve core is arranged to form an inclined surface which is adapted to the profile of the outward section of the valve port; in this way, even if a small volume of impurities passes through the filter screen to the valve port, it can also enter the pressure relief passage through the inclined surface under the action of gravity and be discharged from the valve body with the pressure relief medium, without being stuck in the valve port to affect the internal pressure of the system.

[0021] In some embodiments of the present application, a valve cavity can be formed in the valve body, one end of the valve cavity is arranged to communicate with the pressure relief passage, and the other end is arranged to install a gasket, so that the valve cavity can communicate with the outside through a gasket hole in the gasket; the peripheral wall of the valve core is arranged to extend into the valve cavity and abut against the inner wall of the valve cavity; a spring is installed in the valve cavity, one end of the spring is arranged to penetrate into a cavity surrounded by the peripheral wall of the valve core and abut against the top cover of the valve core, and the other end of the spring is arranged to abut against the gasket; the opening pressure of the valve port is adjusted by arranging the elastic force of the spring.

[0022] In some embodiments of the present application, when the pressure relief passage is formed with multiple pressure relief branches in the valve body, the peripheral wall of the valve core can be arranged at the intersection of the multiple pressure relief branches, so that during the blocking of the valve port by the top cover of the valve core, all pressure relief ports can be blocked by the peripheral wall of the valve core.

[0023] Compared with the prior art, the advantages and positive effects of the present application mainly include:

[0024] 1. The utility model discloses a filter assembly is additionally arranged in the pressure relief valve, can filter the fluid medium that flows through the pressure relief valve, to filter out the foreign matter in it, avoid the foreign matter and stick in the valve port position, cause the valve port to close abnormally, then cause the system internal pressure to be not stable and so on.

[0025] 2. The utility model discloses the filter assembly of configuration adopts the mode of screw connection and is installed in the valve body of pressure relief valve, not only can guarantee the consistency and reliability of valve body and filter assembly assembly, and convenient replacement filter assembly, reduce the maintenance cost of pressure relief valve.

[0026] 3. The utility model discloses the filter function is realized on the pressure relief valve, installs the pressure relief valve with filtering capacity in the lubricating system, not only can effectively purify the engine oil, but also can block the foreign matter and flow in the lubricating system, guarantee lubricating system safe, stable operation.

[0027] 4. The utility model discloses a pressure relief valve, simple structure, convenient installation, reliable work, low cost, is suitable for application in the system of various needs pressure control.

[0028] Other features and advantages of the utility model will become more apparent after reading the specific implementation mode of the utility model in combination with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the drawings needed in the embodiment will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0030] Figure 1 It is the overall structure schematic diagram of one embodiment of the pressure relief valve with filter element built-in proposed in the utility model;

[0031] Figure 2 It is Figure 1 The structure exploded view of one embodiment of the pressure relief valve shown in;

[0032] Figure 3 It is Figure 2 The overall structure schematic diagram of one embodiment of the valve body in;

[0033] Figure 4 It is Figure 3 The A-A cross section view of one embodiment of the valve body shown in;

[0034] Figure 5 It is Figure 2 The overall structure schematic diagram of one embodiment of the filter assembly in;

[0035] Figure 6 is Figure 5 is a structural schematic view of one embodiment of the filter body in the filter assembly shown in

[0036] Figure 7 is Figure 5 is a structural schematic view of one embodiment of the filter screen in the filter assembly shown in

[0037] Figure 8 is Figure 1 is a B-B sectional view of one embodiment of the pressure relief valve shown in

[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, straight cylinder section; 152, flared section; 160, valve cavity; 161, opening; 162, mounting groove; 170, assembly hole; 200, valve core; 210, top cover; 211, inclined surface; 220, peripheral wall; 300, filter assembly; 310, filter body; 311, mounting portion; 312 external thread; 313, base; 314, inner ring hole; 315, support column; 316, operation hole; 320, filter screen; 400, spring; 500, gasket; 510, gasket 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 utility model, it is necessary to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or the communication inside component. For the person skilled in the art, the above-mentioned term can be understood according to the concrete situation in the concrete meaning of the utility model in the utility model. In the description of embodiment, specific features, structure, material or characteristics can be combined in any one or more embodiments or examples with suitable way.

[0042] In the description of the utility model, unless otherwise stated, the meaning of "multiple" is two or more than two.

[0043] Combined Figure 1 、 Figure 2 As shown, the pressure relief valve of the embodiment includes valve body 100, valve core 200, filter assembly 300, spring 400 and other main components.

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

[0045] Among them, head 110 can be designed into a polygonal structure to facilitate construction personnel to hold valve body 100 and carry out pressure relief valve installation and disassembly operation on system pipeline.

[0046] Fluid passage 130 and pressure relief passage 140 can be provided on stem 120, as shown in Figure 4 In some embodiments, the fluid passage 130 can be configured to form multiple flow branches in the valve body 100, and then form multiple inlet and outlet ports 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 the system that only needs to use a single-input single-output pressure relief valve, the excess inlet and outlet ports 131 can be sealed by using a plug to meet the use requirements of the system.

[0047] Similarly, the pressure relief passage 140 can also form multiple pressure relief branches in the valve body 100, and then form multiple pressure relief ports 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] To facilitate the construction personnel to clearly distinguish the fluid passage 130 and the pressure relief passage 140, avoid confusing, can form a convex waist 121 in the middle of the length direction of the rod part 120, through the waist 121, the rod part 120 is divided into upper and lower two sections. Among them, the upper section 122 can be set up fluid passage 130, when using, installed on the system pipeline, for the fluid medium (such as oil, etc.) in the system. The lower section 123 can be set up pressure relief passage 140, when the pressure in the system exceeds the set threshold, part of the fluid medium is discharged, to maintain the stability of the 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 the pressure relief is realized.

[0050] In some embodiments, the valve port 150 can be set up in the waist 121 of the valve body 100, forming a structure similar to a funnel, including a straight cylinder section 151 and an expanded section 152. Among them, the straight cylinder section 151 communicates the fluid passage 130, which is used to install the filter assembly 300. The expanded section 152 communicates the pressure relief passage 140, which 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 is controlled.

[0051] The valve body 100 is also provided with a valve cavity 160, as shown in Figure 4 , the valve cavity 160 and the valve port 150 can be disposed on opposite sides of the pressure relief passage 140, the spring 400 is installed in the valve cavity 160, and the opening pressure of the valve port 150 is adjusted by the elastic force of the spring 400. The greater the elastic force of the spring 400, the greater the opening pressure of the valve port 150.

[0052] In some embodiments, the valve cavity 160 can be configured to pass through the bottom of the valve body 100, that is, the opening 161 of the end of the rod part 120 away from the head part 110 is configured, and a ring of mounting groove 162 can be formed at the opening 161 to install the gasket 500. The gasket 500 is detachably assembled with the rod part 120 of the valve body, so as to facilitate the replacement of the filter assembly 300 in the valve body 100 later.

[0053] In order to realize the detachable assembly of the filter assembly 300 in the valve body 100, a detachable assembly assembly hole 170, such as a threaded hole, can be set up in the valve body 100, which is connected with the filter assembly 300 by screwing, so as to achieve the purpose of replacing the filter assembly 300 conveniently.

[0054] In the embodiment, the assembly hole 170 is arranged on opposite sides of the fluid passage 130 relative to the valve port 150, so that the filter assembly 300 installed in the valve body 100 can cross the fluid passage 130, effectively blocking foreign matter in the fluid passage 130.

[0055] In some embodiments, the assembly hole 170, the valve port 150, the valve cavity 160, and the central axis of the valve body 100 are coaxial, and the inner diameter of the valve port 150 and the valve cavity 160 is greater than the outer diameter of the filter assembly 300. In this way, when the filter assembly 300 is installed, the filter assembly 300 can be inserted from the bottom opening 161 of the valve body 100, and then sequentially pass through the valve cavity 160, the pressure relief passage 140, the valve port 150, and the fluid passage 130, and be installed in the assembly hole 170.

[0056] As shown in Figures 5 to 7 The filter assembly 300 of the embodiment mainly includes a filter body 310 and a filter screen 320. The filter screen 320 is installed on the filter body 310 and is installed in the valve body 100 through the filter body 310. The filter body 310 can be arranged to cross the fluid passage 130 in the valve body 100, so that the filter screen 320 can cross the fluid passage 130 and completely block foreign matter in the fluid passage.

[0057] In order to enable clean fluid medium flowing through the filter screen 320 to smoothly enter the valve port 150, so as to flow into the pressure relief passage 140 when the valve port 150 is opened, and to ensure reliable pressure relief of the system, the embodiment forms a drainage passage on the filter body 310 to communicate the fluid passage 130 and the valve port 150, so as to eliminate the influence of introducing the filter assembly 300 on the normal flow of the fluid medium.

[0058] In some embodiments, as shown in Figure 6 The filter body 310 can be configured to include main components such as a mounting portion 311, a base 313, and a support column 315.

[0059] The mounting portion 311 is used for detachable connection with the valve body 100. For example, external threads 312 can be formed on the mounting portion 311 and are threadedly connected with the assembly hole 170 (threaded hole) formed in the valve body 100.

[0060] The base 313 is installed in the valve port 150 and can be designed in an annular shape and installed in the straight cylinder section of the valve port 150. The inner ring hole 314 of the annular base 313 can be used as part of the drainage passage formed by the filter body 310.

[0061] The support column 315 is connected between the mounting portion 311 and the base 313 and is used for installing the filter screen 320 so that the filter screen 320 is located in the fluid passage 130.

[0062] In some embodiments, multiple support columns 315 may be provided, spaced apart circumferentially between the mounting portion 311 and the base 313. The filter screen 320 is designed in a cylindrical shape, such as... Figure 7 As shown, the support columns 315 are fitted around their outer perimeter, such as Figure 5 As shown, this is used to filter fluid media coming from different directions.

[0063] Because multiple support columns 315 are spaced apart, the fluid medium flowing through the filter screen 320 can flow into the valve port 150 through the gap area formed between two adjacent support columns 315, or continue to flow downstream in the fluid channel 130 through the filter assembly 300. In other words, the gap area between two adjacent support columns 315 also forms part of the flow channel of the filter assembly 300, which, together with the inner annular hole 314 of the base 313, constitutes the entire flow channel of the filter assembly 300.

[0064] When the fluid channel 130 forms multiple flow branches in the valve body 100, the filter assembly 300 can be installed at the intersection of these branches. This ensures that regardless of which inlet or outlet 131 the fluid medium flows into the pressure relief valve, it must be filtered by the filter assembly 300 before entering the valve port 150 and the downstream pipeline of the system. This configuration not only effectively prevents foreign objects from blocking the valve port 130 and affecting the normal pressure relief of the system, but also improves the purity of the fluid medium in the system pipeline, eliminating the potential adverse effects of foreign objects on the normal operation of the system.

[0065] To facilitate the installation of the filter assembly 300 into the valve body 100 by construction personnel, an operating hole 316 can be provided inside the mounting portion 311 of the filter body, aligned with the drainage channel formed on the filter body 310, to allow access for disassembly and assembly tools. Figure 8 As shown. When the filter assembly 300 needs to be replaced, the new filter assembly 300 can be inserted through the opening 161 at the bottom of the valve body 100, passing sequentially through the valve cavity 160, the pressure relief passage 140, the valve port 150, and the fluid passage 130, and then installed in the mounting hole 170. Then, using a suitable disassembly tool, such as a wrench, it is inserted into the operating hole 316 and rotated to rotate the filter assembly 300, threading the filter assembly 300 into the valve body 100. Through thread matching, the consistency and reliability of the assembly of the filter assembly 300 and the valve body 100 can be ensured.

[0066] In order to control the valve port 150 to close when the internal pressure of the system is normal and open when the internal pressure of the system is too high, this embodiment configures a valve core 200 in the valve port 150 for switching the valve port 150 on and off.

[0067] CombinationFigure 2 , Figure 8 As shown, in some embodiments, the valve core 200 can be installed on the extended section 152 of the valve port 150, adjacent to the base 313 of the filter body 310. The fluid medium filtered by the filter screen 320 can reach the valve core 200 through the inner ring hole 314 on the base 313. When the valve core 200 opens the valve port 150, it flows into the pressure relief channel 140, thereby reducing the internal pressure of the system.

[0068] In some embodiments, the valve core 200 can be designed as a housing structure, such as... Figure 8 As shown, it includes a top cover 210 and a peripheral wall 220.

[0069] The top cover 210 is disposed in the valve port 150, specifically in the extended section 152 of the valve port 150, adjacent to the base 313 of the filter body 310 disposed in the straight section 151 of the valve port 150. The outer edge of the top cover 210 can be designed as an inclined surface 211, and the shape and size of the top cover 210 can be adapted to the contour shape and size of the extended section 152 of the valve port. In this way, when the internal pressure of the system is normal, the extended section 152 of the valve port 150 can be completely sealed by the top cover 210 to prevent pressure leakage.

[0070] Meanwhile, the outer edge of the top cover 210 is configured to form a downward inclined surface 211. In this way, when the system is depressurized, even if a small foreign object mixed in the fluid medium passes through the filter screen 320 and enters the valve port 150, it can fall into the pressure relief channel 140 through the inclined surface 211 of the top cover 210 under the action of its own gravity, and then be discharged from the valve body 100 with the pressure relief medium (the fluid medium that enters the pressure relief channel 140), so as not to cause the problem of foreign objects getting stuck in the valve port 150.

[0071] The peripheral wall 220 of the valve core 200 can be designed as a cylinder, with one end connected to the top cover 210 and the other end extending away from the valve port 150 and crossing the pressure relief passage 140. When the internal pressure of the system is normal, it is used to block the pressure relief passage 140.

[0072] In cases where the pressure relief channel 140 forms multiple pressure relief branches in the valve body 100, the peripheral wall 220 of the valve core 200 can be configured at the intersection of multiple pressure relief branches. In this way, during periods of normal internal system pressure, the peripheral wall 220 of the valve core 200 can be used to block all pressure relief ports 141 on the valve body 100.

[0073] In this embodiment, during periods of normal internal system pressure, the top cover 210 of the valve core 200 is configured to block the valve port 150, and the peripheral wall 220 of the valve core 200 is configured to block the pressure relief port 141. By utilizing the cooperation between the top cover 210 and the peripheral wall 220, the problem of abnormal system pressure leakage can be completely eliminated.

[0074] In some embodiments, the peripheral wall 220 of the spool 200 can be extended into the valve cavity 160 from one end of the valve port 150 and abut against the inner wall of the valve cavity 160 to prevent the fluid medium flowing into the valve cavity 160 from the pressure relief passage 140.

[0075] The spring 400 is installed in the valve cavity 160, one end of the spring 400 is extended into the cavity surrounded by the peripheral wall 220 of the spool 200 and abuts against the top cover 210 of the spool 200, and the other end of the spring 400 abuts against the washer 500 installed at the bottom of the valve cavity 160. By configuring the elastic force of the spring 400, the opening pressure of the valve port 150 can be adjusted.

[0076] In this embodiment, the washer 500 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 washer hole 510, is formed in the washer 500. When the spool 200 moves and the volume of the valve cavity 160 changes, the pressure in the valve cavity 160 will not change due to the change in the volume of the valve cavity 160 because the valve cavity 160 is in communication with the outside through the washer hole 510 in the washer 500, and thus the movement of the spool 200 will not be affected.

[0077] Industrial applicability

[0078] The pressure relief valve of the present embodiment is applied to an engine lubrication system.

[0079] 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 oil.

[0080] The pressure relief threshold is determined according to the normal pressure range of the engine lubrication system, and the elastic force of the spring 400 is configured according to the pressure relief threshold.

[0081] During the operation of the engine lubrication system, oil flows in the main oil line, and when it flows through the fluid passage 130 of the pressure relief valve, a small amount of oil enters the valve port 150 of the pressure relief valve after being filtered by the filter assembly 300 in the pressure relief valve, and most of the oil continues to flow downstream in the main oil line.

[0082] When the pressure in the engine lubrication line rises and is greater than the elastic force of the spring 400 in the pressure relief valve, the spool 200 moves towards the valve cavity 160, compresses the spring 400, opens the valve port 150 (the greater the pressure in the main oil line, the greater the opening degree of the valve port 150), and makes the oil stopped in the straight section 151 of the valve port flow into the flared section 152 of the valve port, and then enters the pressure relief passage 140 through the flared section 152 to form pressure relief oil, which then flows into the crankcase through the oil return pipe.

[0083] When 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 400 rebounds, drives the valve core 200 to move in the direction of 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 lubricating system.

[0084] The pressure relief valve of the embodiment is simple in structure and reliable in work, and can be widely applied in the hydraulic systems of engineering machinery, metallurgical equipment, ships, automobiles and the like, so that the hydraulic system is protected from overpressure, and the safe operation of the system and the normal work of the equipment are ensured.

[0085] Of course, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the corresponding technical solutions deviate from the spirit and scope of the technical solutions claimed by the present application.

Claims

1. A pressure relief valve having a filter cartridge built in, characterized by, The pressure relief valve comprises: a valve body having a fluid passage, a pressure relief passage, and a valve port connecting the fluid passage and the pressure relief passage; a valve core configured at the valve port position for opening or closing the valve port; a filter assembly for preventing foreign matters in the fluid passage from flowing to the valve port, comprising: a filter body installed in the valve body and crossing the fluid passage, and having a flow passage connecting the fluid passage and the valve port; a filter screen installed on the filter body and located in the fluid passage for filtering foreign matters in the fluid passage.

2. The pressure relief valve with a built-in filter cartridge according to claim 1, characterized in that, The filter body comprises: a mounting portion detachably mounted on the valve body; a base annularly mounted in the valve port; a support column installed between the mounting portion and the base and located in the fluid passage, and having the filter screen installed thereon.

3. The pressure relief valve with the built-in filter core according to claim 2, wherein: the support column comprises a plurality of support columns circumferentially spaced between the mounting portion and the base, and the interval region formed between two adjacent support columns and the inner annular hole of the base form the flow passage; the filter screen is cylindrically surrounded and sleeved on the outer periphery of the support column.

4. The pressure relief valve with the built-in filter core according to claim 2, wherein: the mounting portion of the filter body is externally threaded; the valve body is provided with a threaded hole, and the mounting portion of the filter body is threadedly connected in the threaded hole of the valve body.

5. The pressure relief valve with the built-in filter core according to claim 4, wherein: an operating hole is formed in the interior of the mounting portion of the filter body for the insertion of a tool for dismounting and mounting, so as to rotate the filter assembly and threadedly connect the filter assembly in the threaded hole of the valve body; the operating hole is aligned with the flow passage of the filter body for the passage of the tool.

6. The pressure relief valve with the built-in filter core according to claim 4, wherein: the threaded hole and the valve port are distributed on opposite sides of the fluid passage, so that the filter assembly crosses the fluid passage; the fluid passage is provided with a plurality of flow branches in the valve body, and the filter assembly is configured at the intersection of the flow branches.

7. The pressure relief valve with a built-in filter cartridge according to any one of claims 2 to 6, characterized in that, The valve core comprises: a top cover configured in the valve port and adjacent to the base of the filter body; a peripheral wall cylindrically connected to the top cover and extending away from the valve port.

8. The pressure relief valve with the built-in filter core according to claim 7, wherein: the valve port is funnel-shaped and comprises: a straight cylinder segment connected to the fluid passage and having the base of the filter body fitted therein; an outward segment connected to the pressure relief passage and having the top cover of the valve core fitted therein; the outer edge of the top cover of the valve core is formed with an inclined surface matched with the profile of the outward segment of the valve port.

9. The pressure relief valve with the built-in filter core according to claim 7, wherein: a valve cavity is formed in the valve body, one end of the valve cavity is connected to the pressure relief passage, and the other end of the valve cavity is provided with a gasket, and the valve cavity is connected to the outside through a gasket hole in the gasket. The other end of the peripheral wall of the valve core extends into the valve cavity and is in close contact with the inner wall of the valve cavity; A spring is installed in the valve cavity, one end of the spring penetrates into the cavity surrounded 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.

10. The pressure relief valve with a built-in filter cartridge of claim 7, wherein, The pressure relief channel 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.

Images