Manual-automatic integrated pressure relief safety valve and pre-filter

Abstract

The utility model relates to a manual and automatic integrated pressure relief safety valve which comprises a valve shell, the valve shell is provided with a water inlet end, a water outlet end and a valve shell cavity, an inner valve body is arranged in the valve shell cavity, the inner valve body is provided with an inner valve cavity, the portion, close to the water inlet end, of the inner valve cavity is closed, and a first elastic reset element and a piston piece are arranged in the inner valve cavity in a sliding and sealing mode. The two ends of the first elastic reset element are connected with the piston piece and the inner valve cavity correspondingly, the inner valve body is provided with an assembly end located on the side, close to the water outlet end, of the piston piece and fixedly connected with the water outlet end through the assembly end, an outer valve cavity is formed by a cavity between the outer portion of the piston piece and the water outlet end, and a pressure relief linkage piece is arranged in the outer valve cavity. The pressure relief linkage piece comprises a connecting part, a sealing part and a pressure relief part, the connecting part is fixedly connected with the piston piece, the sealing part is in sealed connection with the inner wall of the water outlet end and can move relative to the inner wall of the water outlet end, and the pressure relief linkage piece can move towards the water inlet end along with the piston piece so as to open or close a channel of the water outlet end through the pressure relief part; a communicated outer valve cavity water channel is further arranged between the outer valve cavity and the water inlet end.

Description

Technical Field

[0001] The utility model relates to a manual-automatic integrated pressure relief safety valve and a pre-filter, belonging to the technical field of water purification equipment. Background Art

[0002] The pre-filter in the prior art includes: a machine head, a filter bottle connected to the machine head at the upper end, a drainage ball valve connected to the lower end of the filter bottle, a filter screen frame is arranged in the filter bottle, and a filter screen is sleeved on the outer wall of the filter screen frame. During use, water flows from the water inlet of the machine head into the gap between the filter bottle and the filter screen, flows into the center of the filter screen frame after being filtered by the filter screen, and then flows from the center of the filter screen frame to the water outlet of the machine head. The pre-filter has now penetrated into thousands of households and high-end hotels.

[0003] Water hammer refers to the phenomenon that in a closed piping system (including pumps and pre-filters), a large pressure fluctuation and vibration is caused by a sharp change in fluid flow. It is also called "water hammer". Its instantaneous pressure can greatly exceed the normal pressure and often has a destructive effect. In addition, the existing pre-filter is prone to internal water volume expansion under low temperature freezing conditions, causing rupture and leakage; there is no good solution for existing general products, which can only remind users to pay attention to heat preservation, or use a filter bottle with good toughness, but the filter bottle will also rupture and leak after repeated expansion and deformation.

[0004] The Chinese utility model patent with publication number CN217067921U and authorization announcement date July 29, 2022 discloses a pre-filter with a built-in high-pressure buffer device, including a machine head with a water inlet channel and a water outlet channel, a filter bottle and a filter mechanism arranged in the filter bottle, the filter mechanism and the filter bottle are detachably connected to the machine head, the space between the filter mechanism and the filter bottle forms a raw water chamber, the internal space of the filter mechanism forms a purified water chamber, and a buffer device accommodating chamber is provided in the water outlet channel of the machine head or in the water outlet end of the filter mechanism, the buffer device includes a cylinder body, an elastic element arranged in the cylinder body and a sealing cover, an elastic element abutting portion is provided in the cylinder body, and the two ends of the elastic element are respectively abutted against the elastic element abutting portion and the inner side of the sealing cover, and the sealing cover is slidably sealed with the inner wall of the cylinder; the buffer device is fixedly arranged in the buffer device accommodating chamber, and is provided with a water flow channel for purified water to flow to the water outlet channel, and the outer surface of the sealing cover is connected to the water outlet channel. The pre-filter has a more optimized structure and is easy to install, use and maintain. It can resist water hammer impact and freeze. However, it has the following shortcomings: it can only buffer the pressure of water hammer in the pre-filter and cannot automatically or manually release the pressure. When the pressure of water hammer exceeds the buffering limit, it will still cause damage to the pre-filter, that is, it cannot fundamentally solve the water hammer problem.

[0005] The Chinese invention patent with the authorization announcement number CN109373029B and the authorization announcement date March 26, 2024, discloses a safety valve for preventing water hammer unloading, which relates to the technical field of safety valves. The key points of its technical solution are as follows: it includes a valve body, a flow channel is opened inside the valve body, the flow channel includes a connected inlet, a control chamber, and an outlet, the inlet cooperates with the control chamber to form a shoulder, a valve core is arranged inside the control chamber, a driving member 1 is arranged inside the control chamber, and the driving member 1 drives the valve core to press against the shoulder; the valve core includes a piston, a sealing rod and a driving member 2; a through hole is penetrated on the piston, and the through hole connects the control chambers on both sides of the piston; the sealing rod is used to block the through hole; the driving member 2 applies a force to the sealing rod pointing to the inlet side; and a push rod for resisting the sealing rod is arranged on the inner wall of the control chamber. The through hole is arranged inside the piston, and the through hole sealing rod blocks it, so that during the movement of the piston, the orifice of the through hole and the outer wall of the sealing rod are not easy to wear, which improves the service life of the safety valve to a certain extent, and makes the pressure relief of the safety valve more accurate. It has the following shortcomings: the sliding seal arranged between the valve core and the valve body is prone to getting stuck or damaged, resulting in seal failure, pressure relief failure or water leakage failure, affecting the stability of the safety valve, and the safety valve has a relatively complex structure, and has the defects of complex processing technology and high cost when used for a pre-filter.

[0006] The utility model aims to provide a manual-automatic pressure relief safety valve with a more optimized structure and easy industrialization. It can prevent water hammer impact and freezing, and in extreme cases, it can manually or automatically release pressure, is safe and reliable, and can extend the service life of the pre-filter.

[0007] The utility model also aims to provide a pre-filter with the manual-automatic integrated pressure relief safety valve. Utility Model Content

[0008] One of the purposes of the utility model is to solve the shortcomings of the pre-filter of the prior art and provide a manual-automatic pressure relief safety valve with more optimized structure and easy industrialization. It can prevent water hammer impact and freezing, and in extreme cases, it can manually or automatically release pressure, which is safe and reliable and can extend the service life of the pre-filter.

[0009] The second purpose of the utility model is to provide a pre-filter with the manual-automatic pressure relief safety valve.

[0010] The technical solution adopted by the utility model to solve its technical problems is:

[0011] When the closure is closed, the closure is opened and the closure is closed by the spring, and the closure is closed after the closure is closed. When the closure is closed, the closure is opened and the closure is closed, and the closure is closed after the closure is closed.

[0012] Specifically, water at the water inlet end enters the outer valve cavity through the water channel of the outer valve cavity. When the water pressure increases, the first elastic reset element is compressed, and the piston drives the pressure relief linkage to move axially toward the water inlet end. When the water pressure continues to increase, the first elastic reset element is continuously compressed, and the piston drives the pressure relief linkage to move continuously toward the water inlet end until the water outlet channel between the outer valve cavity and the water outlet end is opened through the pressure relief part to realize valve opening and pressure relief. After the pressure relief is completed, the valve is restored to the closed state through the force of the first elastic reset element.

[0013] The working principle of the utility model is as follows: water enters the valve shell cavity from the water inlet end of the manual and automatic integrated pressure relief safety valve, flows through the gap between the valve shell cavity and the inner valve body, and enters the outer valve cavity through the water channel of the outer valve cavity. When the water pressure at the water inlet end changes sharply (water hammer is generated, and the water pressure increases), the first elastic reset element is compressed, and the piston moves toward the water inlet end, and at the same time drives the pressure relief linkage to move axially toward the water inlet end. During the axial movement of the pressure relief linkage, the sealing part and the pressure relief part will also move axially toward the water inlet end, and the sealing connection between the sealing part and the water outlet end is disconnected. , the water outlet channel between the outer valve cavity and the water outlet is opened through the space around the pressure relief part to achieve drainage and pressure relief. After the water hammer condition at the water inlet disappears, the first elastic reset element is reset under the elastic restoring force, and the piston moves toward the water outlet, while driving the pressure relief linkage to move axially toward the water outlet. During the axial movement of the pressure relief linkage, the sealing part and the pressure relief part will also move axially toward the water outlet, and the sealing part and the water outlet will be re-sealed and connected, and the water outlet channel between the outer valve cavity and the water outlet is closed through the sealing surface around the sealing part. When the water freezes and causes volume expansion, the working principle of the utility model is the same.

[0014] Compared with the anti-water hammer unloading safety valve disclosed in the authorization announcement No. CN109373029B, the utility model has the following significant advantages: 1) The structure of the safety valve is relatively simple, and the processing technology is simple and the cost is significantly reduced when used for the pre-filter; 2) The sliding seal arranged between the piston and the inner valve body, even if it is damaged and water enters the inner valve cavity, causing the compressible space of the inner valve cavity to fail, the defect of water leakage and failure of the safety valve will not occur.

[0015] Preferably, the pressure relief linkage comprises a linkage rod, a second elastic reset member and a pressure relief rod, one end of the linkage rod is fixed to the piston member, a sealing portion and a pressure relief portion are arranged on the pressure relief rod, two ends of the second elastic reset member are respectively connected to the other end of the linkage rod and the pressure relief rod, and the linkage rod and the pressure relief rod can synchronously move axially toward the water inlet end. The pressure relief linkage has a simple structure and composition, and through the effective cooperation of the three components, it realizes linkage with the operation of the piston member, thereby realizing valve opening pressure relief or valve closing.

[0016] Preferably, the pressure relief rod is further provided with a pressure relief handle toward the water outlet end, and the pressure relief handle extends to the outside of the water outlet end, and the valve can be manually opened or closed through the pressure relief handle.

[0017] Preferably, the first elastic reset element is an annular spring, and an annular spring support cavity and / or an annular spring support column are respectively provided at the bottom end of the inner valve cavity and the inner end of the piston member, and the two ends of the annular spring are respectively supported by the annular spring support column, or the annular spring support cavity, or the cooperation of the annular spring support column and the annular spring support cavity.

[0018] Preferably, two ends of the first elastic reset element abut against the bottom end of the inner valve cavity and the inner end of the piston member respectively.

[0019] Preferably, a first sliding sealing structure is provided between the piston member and the inner valve chamber, and the first sliding sealing structure is any one or more of a sealing ring, a sealing sleeve and a sealing interlayer.

[0020] Preferably, the water outlet end is provided with a water outlet end cover, and the water outlet end cover includes an inner assembly part, a side assembly part and a functional part. The water outlet end cover is fixedly connected to the water outlet end through the side assembly part, the inner assembly part is assembled with the inner valve body, the outside of the piston member and the cavity of the water outlet end cover form an outer valve cavity, and the water channel of the outer valve cavity is arranged on the side wall of the inner assembly part, and the sealing part of the pressure relief rod and the pressure relief part cooperate with the functional part of the water outlet end cover to realize opening or closing the valve.

[0021] Preferably, a second sliding sealing structure is provided between the sealing portion of the pressure relief rod and the water outlet end cover, and the second sliding sealing structure is any one or more of a sealing ring, a sealing sleeve and a sealing barrier.

[0022] Preferably, the water outlet cover is detachably connected to the water outlet, the inner assembly part is detachably connected to the inner valve body, and the linkage rod is detachably connected to the piston member, and the detachable connection is any one of threaded, snap-on, plug-in and hinged.

[0023] Preferably, the two ends of the second elastic reset element are fixedly connected to the ends of the linkage rod and the pressure relief rod respectively, or the two ends of the second elastic reset element are abutted against the ends of the linkage rod and the pressure relief rod respectively, and a limiting piece is provided between the linkage rod and the pressure relief rod, and the linkage rod and the pressure relief rod achieve synchronous movement due to the action of the limiting piece.

[0024] Preferably, the pressure relief rod is provided with a limit sleeve, the limit sleeve is provided with a linkage rod assembly hole, the linkage rod is provided with a limit part, and the limit part cooperates with the limit sleeve to realize the relative movement of the linkage rod and the pressure relief rod and then the synchronous movement. By first relative movement and then synchronous movement, the situation that the pressure in the safety valve is opened to release pressure as soon as the pressure inside the safety valve increases is avoided. The pressure increase is first alleviated by adjusting the inside of the safety valve. When the internal adjustment cannot meet the requirements, further synchronous movement is performed to realize the valve opening and pressure relief.

[0025] A pre-filter comprises a machine head, a filter bottle and a filtering mechanism, and is provided with the manual-automatic pressure relief safety valve.

[0026] Preferably, the machine head is provided with an assembly port connected to a water inlet channel or a water outlet channel, and the assembly port is connected to a water inlet end of the manual-automatic pressure relief safety valve.

[0027] Preferably, the water outlet end at the bottom of the filter bottle is provided with an assembly port and a water outlet seal, the filter bottle constitutes the valve shell of the manual-automatic pressure relief safety valve, the water outlet seal constitutes the water outlet end cover, the manual-automatic pressure relief safety valve is assembled with the water outlet seal, and the valve is opened or closed by the cooperation between the pressure relief part and the water outlet seal.

[0028] Preferably, the filtering mechanism of the pre-filter is any one of a filter element type filtering mechanism, a laminated filtering mechanism, a filtering backwashing composite structure and a laminated filter element composite structure.

[0029] The beneficial effects of the utility model are: 1) the safety valve structure is relatively simple, and the processing technology is simple and the cost is significantly reduced when used for the pre-filter; 2) even if the sliding seal arranged between the piston and the inner valve body is damaged and water enters the inner valve cavity, causing the compressible space of the inner valve cavity to fail, the defect of water leakage and failure of the safety valve will not occur. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of the utility model;

[0032] Figure 2 yes Figure 1 A cross-sectional view of

[0033] Figure 3 yes Figure 1 Cross-sectional view (pressure relief closed state);

[0034] Figure 4 yes Figure 1 Cross-sectional view (pressure relief open state);

[0035] Figure 5 yes Figure 1 Exploded diagram of

[0036] Figure 6 is a schematic structural diagram of Example 2;

[0037] Figure 7 is a schematic structural diagram of Example 2;

[0038] Figure 8 is a schematic structural diagram of Example 2;

[0039] Fig. 9 is a schematic structural diagram of Example 3;

[0040] Fig.10 is a schematic structural diagram of Example 3;

[0041] Fig.11 is a schematic structural diagram of Example 3;

[0042] In the figure: 1. valve housing, 11. water inlet end, 12. water outlet end, 13. valve housing cavity, 2. inner valve body, 21. inner valve cavity, 23. first elastic reset element, 24. piston member, 25. assembly end, 3. linkage rod, 31. limiting part, 4. second elastic reset member, 5. pressure relief rod, 6. first sliding sealing structure, 7. second sliding sealing structure, 8. limiting sleeve, 9. machine head, 10. filter bottle, 11-1, filtering mechanism. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0045] In the description of the utility model, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0046] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0047] Example 1

[0048] like Figure 1-5As shown, the manual and automatic pressure relief safety valve comprises a valve housing 1, wherein the valve housing 1 is provided with a water inlet end 11, a water outlet end 12 and a valve housing cavity 13 connecting the water inlet end 11 and the water outlet end 12, and is characterized in that: an inner valve body 2 is provided in the valve housing cavity 13, and the inner valve body 2 is provided with an inner valve cavity 21, the inner valve cavity 21 is closed close to the water inlet end 11, and a first elastic reset element 23 and a sliding seal are provided in the inner valve cavity 21, and the two ends of the first elastic reset element 23 are respectively connected with the piston element 24 and the inner valve cavity 21, and the inner valve body 2 is provided with an assembly end 25 on the side of the piston element 24 close to the water outlet end 12, and is fixedly connected with the water outlet end 12 through the assembly end 25, and the cavity between the outside of the piston element 24 and the water outlet end 12 forms an outer valve cavity 14, and a pressure relief linkage is provided in the outer valve cavity 14, and the pressure relief linkage comprises a connecting portion, a sealing portion and a pressure relief portion, and the connecting portion is fixedly connected with the piston element 24, and the pressure relief linkage comprises a connecting portion, a sealing portion and a pressure relief portion, and the connecting portion is fixedly connected with the piston element 24. The sealing portion is sealed and connected to the inner wall of the water outlet end 12 and can move relative to it. The pressure relief linkage can move toward the water inlet end 11 or away from the water inlet end 11 with the piston member 24 to open or close the channel of the water outlet end 12 through the pressure relief portion. A connected outer valve cavity water channel 15 is also provided between the outer valve cavity 14 and the water inlet end 11. In this embodiment, water from the water inlet end 11 enters the outer valve cavity 14 through the outer valve cavity water channel 15. When the water pressure increases, the first elastic reset element 23 is compressed, and the piston member 24 drives the pressure relief linkage to move axially toward the water inlet end 11. When the water pressure continues to increase, the first elastic reset element 23 is continuously compressed, and the piston member 24 drives the pressure relief linkage to continue to move toward the water inlet end 11 until the water outlet channel between the outer valve cavity 14 and the water outlet end 12 is opened through the pressure relief portion to realize valve opening pressure relief. After the pressure relief is completed, the valve is restored to the closed state through the force of the first elastic reset element 23.

[0049] The working principle of the utility model is as follows: water enters the valve housing cavity 13 from the water inlet end of the manual and automatic integrated pressure relief safety valve, flows through the gap between the valve housing cavity 13 and the inner valve body 2, and enters the outer valve cavity 14 through the outer valve cavity water channel 15. When the water pressure at the water inlet end 11 changes sharply (water hammer is generated, and the water pressure increases), the first elastic reset element 23 is compressed, and the piston member 24 moves toward the water inlet end 11, and at the same time drives the pressure relief linkage member to move axially toward the water inlet end 11. During the axial movement of the pressure relief linkage member, the sealing part and the pressure relief part will also move axially toward the water inlet end 11, and the sealing connection between the sealing part and the water outlet end 12 is disconnected. Open, open the water outlet channel between the outer valve cavity 14 and the water outlet end 12 through the space around the pressure relief part, realize drainage and pressure relief, after the water hammer condition of the water inlet end 11 disappears, under the elastic restoring force of the first elastic reset element 23, reset, the piston 24 moves toward the water outlet end 12, and drives the pressure relief linkage to move axially toward the water outlet end 12 at the same time, during the axial movement of the pressure relief linkage, the sealing part and the pressure relief part will also move axially toward the water outlet end 12, the sealing part and the water outlet end 12 are re-sealed and connected, and the water outlet channel between the outer valve cavity 14 and the water outlet end 12 is closed through the sealing surface around the sealing part. When the water freezes and causes volume expansion, the working principle of the utility model is the same.

[0050] Compared with the water hammer unloading safety valve disclosed in the authorization announcement No. CN109373029B, the utility model has the following significant advantages: 1) The structure of the safety valve is relatively simple, and the processing technology is simple and the cost is significantly reduced when used for the pre-filter; 2) The sliding seal arranged between the piston member 24 and the inner valve body 2, even if it is damaged, water enters the inner valve cavity 21, causing the compressible space of the inner valve cavity 21 to fail, but the defect of water leakage and failure of the safety valve will not occur.

[0051] Specifically, the pressure relief linkage comprises a linkage rod 3, a second elastic reset member 4 and a pressure relief rod 5, one end of the linkage rod 3 is fixed to the piston member 24, a sealing portion and a pressure relief portion are provided on the pressure relief rod 5, two ends of the second elastic reset member 4 are respectively connected to the other end of the linkage rod 3 and the pressure relief rod 5, and the linkage rod 3 and the pressure relief rod 5 can synchronously move axially toward the water inlet end 11. The pressure relief linkage has a simple structure, and through the effective cooperation of the three components, it realizes linkage with the operation of the piston member, thereby realizing valve opening and pressure relief or valve closing.

[0052] In this embodiment, the pressure relief rod 5 is further provided with a pressure relief handle 51 toward the water outlet end 12 , and the pressure relief handle 51 extends to the outside of the water outlet end 12 . The valve can be opened or closed manually through the pressure relief handle 51 .

[0053] The structure of the utility model is explained in more detail: the first elastic reset element 23 is an annular spring, the bottom end of the inner valve cavity 14 and the inner end of the piston 24 are respectively provided with an annular spring support cavity and / or an annular spring support column, and the two ends of the annular spring are respectively supported by an annular spring support column, or an annular spring support cavity, or the cooperation of the annular spring support column and the annular spring support cavity. The specific method to be selected can be conventionally selected by those skilled in the art according to the processing needs.

[0054] Specifically, two ends of the first elastic reset element 23 abut against the bottom end of the inner valve cavity 21 and the inner end of the piston member 24 respectively.

[0055] In this embodiment, a first sliding sealing structure 6 is provided between the piston member 24 and the inner valve chamber 21. The first sliding sealing structure 6 is any one or more of a sealing ring, a sealing sleeve and a sealing interlayer, and a sealing ring structure is preferably selected.

[0056] The structure of the utility model is explained in more detail: the water outlet end 12 is provided with a water outlet end cover 12a, and the water outlet end cover 12a includes an inner assembly part 12a-1, a side assembly part 12a-2 and a functional part 12a-3. The water outlet end cover 12a is fixedly connected to the water outlet end 12 through the side assembly part 12a-2, the inner assembly part 12a-1 is assembled with the inner valve body 2, the outside of the piston member 24 and the cavity of the water outlet end cover 12a form an outer valve cavity 14, and the water channel of the outer valve cavity 14 is arranged on the side wall of the inner assembly part 12a-1, and the sealing part and the pressure relief part of the pressure relief rod 5 cooperate with the functional part 12a-3 of the water outlet end cover 12a to realize opening or closing the valve.

[0057] In this embodiment, a second sliding sealing structure 7 is provided between the sealing portion of the pressure relief rod 5 and the water outlet end cover 12a. The second sliding sealing structure 7 is any one or more of a sealing ring, a sealing sleeve and a sealing interlayer, and a sealing ring structure is preferably selected.

[0058] Specifically, the water outlet cover 12a is detachably connected to the water outlet end 12, the inner assembly part 12a-1 is detachably connected to the inner valve body 2, specifically, the assembly end 25 is fixedly and detachably connected to the inner assembly part 12a-1, the linkage rod 3 is detachably connected to the piston member 24, and the detachable connection is any one of threaded connection, snap-on connection, plug-in connection and hinged connection.

[0059] In this embodiment, the two ends of the second elastic reset element 4 are fixedly connected to the ends of the linkage rod 3 and the pressure relief rod 5, or the two ends of the second elastic reset element 4 are respectively abutted against the ends of the linkage rod 3 and the pressure relief rod 5, and a limiting member is provided between the linkage rod 3 and the pressure relief rod 5, and the linkage rod 3 and the pressure relief rod 5 achieve synchronous movement due to the action of the limiting member.

[0060] Furthermore, the pressure relief rod 5 is provided with a limit sleeve 8, the limit sleeve 8 is provided with a linkage rod assembly hole, and the linkage rod 3 is provided with a limit portion 31. Through the cooperation of the limit portion 31 and the limit sleeve 5, the linkage rod 3 and the pressure relief rod 5 are relatively moved and then synchronously moved. By first moving relative and then synchronously, the situation where the pressure in the safety valve is opened to release pressure as soon as the pressure inside the safety valve increases is avoided. The pressure increase is first alleviated by adjusting the inside of the safety valve. When the internal adjustment cannot meet the requirements, further synchronous movement is performed to open the valve to release pressure.

[0061] Example 2

[0062] like Figure 6-8 A pre-filter shown in the figure comprises a machine head 9, a filter bottle 10 and a filtering mechanism 11-1, and is provided with a manual-automatic pressure relief safety valve. The machine head 9 is provided with an assembly port connected to a water inlet channel or a water outlet channel, and the assembly port is connected to the water inlet end of the manual-automatic pressure relief safety valve. The structure of the manual-automatic pressure relief safety valve is the same as that of Example 1, and the filtering mechanism of the pre-filter is any one of a filter element filtering mechanism, a laminated filtering mechanism, a filtering backwashing composite structure and a laminated filter element composite structure.

[0063] Example 3

[0064] like Figure 9-11 A pre-filter shown includes a machine head 9, a filter bottle 10 and a filtering mechanism 11-1. The bottom water outlet end of the filter bottle 10 is provided with an assembly port and a water outlet seal. The filter bottle 10 constitutes a valve housing 1 of a manual-automatic pressure relief safety valve. The water outlet seal constitutes a water outlet end cover 12a. The manual-automatic pressure relief safety valve is assembled with the water outlet seal. The valve is opened or closed by the cooperation of the pressure relief part and the water outlet seal. The filtering mechanism of the pre-filter is any one of a filter element filtering mechanism, a laminated filtering mechanism, a filtering backwashing composite structure and a laminated filter element composite structure.

[0065] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A manual-automatic pressure relief safety valve, comprising a valve housing (1), wherein the valve housing (1) is provided with a water inlet end (11), a water outlet end (12), and a valve housing cavity (13) communicating with the water inlet end (11) and the water outlet end (12), and characterized in that: The valve housing cavity (13) is provided with an inner valve body (2), the inner valve body (2) is provided with an inner valve cavity (21), the inner valve cavity (21) is closed near the water inlet end (11), and a first elastic reset element (23) and a sliding seal are provided in the inner valve cavity (21), the two ends of the first elastic reset element (23) are respectively connected to the piston element (24) and the inner valve cavity (21), the inner valve body (2) is provided with an assembly end (25) located on the side of the piston element (24) near the water outlet end (12), and is fixedly connected to the water outlet end (12) via the assembly end (25), and the piston element (24) is externally An outer valve cavity (14) is formed between the outer valve cavity (14) and the water outlet end (12). A pressure relief linkage is provided in the outer valve cavity (14). The pressure relief linkage comprises a connecting portion, a sealing portion and a pressure relief portion. The connecting portion is fixedly connected to the piston member (24). The sealing portion is sealedly connected to the inner wall of the water outlet end (12) and can move relative to it. The pressure relief linkage can move with the piston member (24) toward the water inlet end (11) or away from the water inlet end (11) to open or close the channel of the water outlet end (12) through the pressure relief portion. A communicating outer valve cavity water channel (15) is also provided between the outer valve cavity (14) and the water inlet end (11).

2. The manual-automatic pressure relief safety valve according to claim 1 is characterized in that: The pressure relief linkage comprises a linkage rod (3), a second elastic reset member (4) and a pressure relief rod (5); one end of the linkage rod (3) is fixed to the piston member (24); a sealing portion and a pressure relief portion are arranged on the pressure relief rod (5); two ends of the second elastic reset member (4) are respectively connected to the other end of the linkage rod (3) and the pressure relief rod (5); the linkage rod (3) and the pressure relief rod (5) can synchronously move axially toward the water inlet end (11).

3. The manual-automatic pressure relief safety valve according to claim 2 is characterized in that: The pressure relief rod (5) is further provided with a pressure relief handle (51) towards the water outlet end (12); the pressure relief handle (51) extends to the outside of the water outlet end (12); and the valve can be manually opened or closed by means of the pressure relief handle (51).

4. The manual-automatic pressure relief safety valve according to claim 1, 2 or 3, characterized in that: The first elastic reset element (23) is an annular spring, and an annular spring support cavity and / or an annular spring support column are respectively provided at the bottom end of the inner valve cavity (21) and the inner end of the piston member (24), and the two ends of the annular spring are respectively limitedly supported by the annular spring support column, or the annular spring support cavity, or the cooperation of the annular spring support column and the annular spring support cavity.

5. The manual-automatic pressure relief safety valve according to claim 4 is characterized in that: Two ends of the first elastic reset element (23) are respectively in contact with the bottom end of the inner valve cavity (21) and the inner end of the piston member (24).

6. The manual-automatic pressure relief safety valve according to claim 1, 2 or 3, characterized in that: A first sliding sealing structure (6) is provided between the piston member (24) and the inner valve chamber (21), and the first sliding sealing structure (6) is any one or more of a sealing ring, a sealing sleeve and a sealing barrier.

7. The manual-automatic pressure relief safety valve according to claim 2 or 3, characterized in that: The water outlet end (12) is provided with a water outlet end cover (12a), the water outlet end cover (12a) comprising an inner assembly part (12a-1), a side assembly part (12a-2) and a functional part (12a-3); the water outlet end cover (12a) is fixedly connected to the water outlet end (12) via the side assembly part (12a-2); the inner assembly part (12a-1) is assembled with the inner valve body (2); the outside of the piston member (24) and the cavity of the water outlet end cover (12a) form an outer valve cavity (14); a water channel of the outer valve cavity (14) is arranged on the side wall of the inner assembly part (12a-1); the sealing part and the pressure relief part of the pressure relief rod (5) cooperate with the functional part (12a-3) of the water outlet end cover (12a) to realize opening or closing of the valve.

8. The manual-automatic pressure relief safety valve according to claim 7 is characterized in that: A second sliding sealing structure (7) is provided between the sealing portion of the pressure relief rod (5) and the water outlet end cover (12a); the second sliding sealing structure (7) is any one or more of a sealing ring, a sealing sleeve and a sealing barrier.

9. The manual-automatic pressure relief safety valve according to claim 7, characterized in that: The water outlet cover (12a) is detachably connected to the water outlet (12), the inner assembly portion (12a-1) is detachably connected to the inner valve body (2), and the linkage rod (3) is detachably connected to the piston member (24), wherein the detachable connection is any one of a screw connection, a clamp connection, a plug connection and a hinge connection.

10. The manual-automatic pressure relief safety valve according to claim 2, characterized in that: The two ends of the second elastic return member (4) are respectively fixedly connected to the ends of the linkage rod (3) and the pressure relief rod (5), or the two ends of the second elastic return member (4) are respectively abutted against the ends of the linkage rod (3) and the pressure relief rod (5), and a limiting member is provided between the linkage rod (3) and the pressure relief rod (5), so that the linkage rod (3) and the pressure relief rod (5) achieve synchronous movement due to the action of the limiting member.

11. The manual-automatic pressure relief safety valve according to claim 10, characterized in that: The pressure relief rod (5) is provided with a limiting sleeve (8), the limiting sleeve (8) is provided with a linkage rod assembly hole, and the linkage rod (3) is provided with a limiting portion (31). Through the cooperation between the limiting portion (31) and the limiting sleeve (8), the linkage rod (3) and the pressure relief rod (5) can achieve relative movement and then synchronous movement.

12. A pre-filter, comprising a head, a filter bottle and a filtering mechanism, characterized in that: The utility model is provided with a manual-automatic pressure relief safety valve as claimed in any one of claims 1 to 11.

13. A pre-filter according to claim 12, characterized in that: The machine head is provided with an assembly port which is communicated with a water inlet channel or a water outlet channel, and the assembly port is communicated with a water inlet end of the manual-automatic integrated pressure relief safety valve.

14. A pre-filter according to claim 12, characterized in that: The water outlet end at the bottom of the filter bottle is provided with an assembly port and a water outlet seal, the filter bottle constitutes the valve shell of the manual-automatic pressure relief safety valve, the water outlet seal constitutes the water outlet end cover, the manual-automatic pressure relief safety valve and the water outlet seal are assembled in coordination, and the valve is opened or closed by the coordination of the pressure relief part and the water outlet seal.

15. A pre-filter according to claim 12, characterized in that: The filtering mechanism of the pre-filter is any one of a filter element type filtering mechanism, a laminated filtering mechanism, a filtering backwashing composite structure and a laminated filter element composite structure.

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