Sealing cover and pressure reducing valve

Abstract

The utility model discloses a sealing cover and a pressure reducing valve, and relates to the technical field of hydraulic equipment. The sealing cover comprises a cover body and a pressure relief assembly, an anti-freezing boss is arranged in the cover body, a pressure relief channel is formed in the anti-freezing boss, and one end of the pressure relief channel is communicated with the interior of the cover body through a pressure relief hole; the pressure relief assembly comprises a first sealing piece and a first elastic piece, and the first sealing piece is sealed on the inner wall of the pressure relief channel and can slide in the pressure relief channel after overcoming the elastic force of the first elastic piece. According to the sealing cover, the internal expansion space can be changed according to the volume change of a medium, the sealing cover cannot be broken and damaged due to solidification and expansion of the medium when used in a low-temperature environment, normal use of a product is guaranteed, and safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to a sealing cover and a pressure reducing valve. Background Art

[0002] A pressure reducing valve is a valve that adjusts the inlet pressure to a preset outlet pressure through its own mechanical components and relies on the energy of the medium itself to automatically maintain the stability of the outlet pressure. In order to improve the filtering effect on the medium, a filtering structure needs to be provided inside the pressure reducing valve. It should be noted that the pores of the filtering structure will be blocked during long-term operation, affecting the filtering effect. In order to facilitate the replacement of the filtering structure, the pressure reducing valve usually needs to be provided with a detachable sealing cover at the position of the filtering structure. For easy observation, the sealing cover is made of a transparent material.

[0003] However, when the ambient temperature is too low, the medium inside the pressure reducing valve will freeze and expand in volume, easily causing the sealing cover to crack and damage, resulting in medium leakage and affecting safety. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a sealing cover and a pressure reducing valve, which can change the internal expansion space according to the volume change of the medium, and will not crack and damage due to the freezing and expansion of the medium when used in a low-temperature environment, ensuring the normal use of the product and improving safety.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A sealing cover, comprising:

[0007] A cover body, in which an anti-freezing boss is arranged. The anti-freezing boss is provided with a pressure relief channel, and one end of the pressure relief channel is communicated with the inside of the cover body through a pressure relief hole;

[0008] A pressure relief assembly, including a first sealing member and a first elastic member. The first sealing member seals the inner wall of the pressure relief channel and can slide in the pressure relief channel after overcoming the elastic force of the first elastic member.

[0009] As an optional scheme of the above sealing cover, the first sealing member includes a main body and a sealing ring. The main body is provided with a ring groove, the sealing ring is sleeved on the main body and located in the ring groove, and the sealing ring is configured to seal the gap between the main body and the side wall of the pressure relief channel.

[0010] As an optional scheme of the above sealing cover, the other end of the pressure relief channel is communicated with the outside of the cover body. When the first sealing member slides, the spaces on both sides of the first sealing member in the pressure relief channel are communicated.

[0011] As an alternative to the above-mentioned sealing cover, the pressure relief channel includes a large-diameter section and the small-diameter section, the small-diameter section is located between the large-diameter section and the pressure relief hole, and the first seal can form a seal with the small-diameter section.

[0012] As an alternative to the above-mentioned sealing cover, a plurality of limiting protrusions are spaced and protruded on the outer periphery of the first seal, and the plurality of limiting protrusions are slidably abutted against the inner wall of the large-diameter section to radially limit the first seal.

[0013] As an alternative to the above-mentioned sealing cover, the sealing cover further includes a plug, the plug is detachably connected to the other end of the pressure relief channel, one end of the first elastic member abuts against the plug, and the other end of the first elastic member abuts against the first seal.

[0014] As an alternative to the above-mentioned sealing cover, the plug protrudes with a limiting post, and the first elastic member abuts against the plug and is sleeved around the limiting post.

[0015] A pressure reducing valve, the pressure reducing valve includes the above-mentioned sealing cover, and further includes:

[0016] A valve body, a flow channel and a pressure reducing cavity communicating with the flow channel are formed in the valve body, and the sealing cover is detachably arranged on the valve body to form a filtering cavity with the flow channel;

[0017] A pressure reducing assembly, arranged in the pressure reducing cavity;

[0018] A filtering structure, the filtering structure is arranged in the filtering cavity.

[0019] As an alternative to the above-mentioned pressure reducing valve, the filtering structure includes a bottom plate, and the anti-freezing boss penetrates through the bottom plate.

[0020] As an alternative to the above-mentioned pressure reducing valve, the pressure relief hole is located at the center of the filtering cavity.

[0021] Advantages of the present utility model:

[0022] The present utility model provides a sealing cover and a pressure reducing valve. When the medium in the sealing cover expands in volume due to changing from a liquid to a solid at low temperature, the medium can push the first seal and compress the first elastic member, thereby increasing the expansion space inside the sealing cover and preventing the sealing cover made of transparent material from cracking due to the volume expansion of the medium; when the ambient temperature rises and the medium changes from a solid to a liquid, the first seal fits against the outer edge of the pressure relief hole under the action of the first elastic member to form a sealing effect, preventing the medium from leaking out and ensuring the normal use of the product.

[0023] The sealing cover can change the internal expansion space according to the volume change of the medium, and will not break or be damaged due to the solidification and expansion of the medium when used in a low-temperature environment, ensuring the normal use of the product and improving safety. Brief Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of a pressure reducing valve provided by the present utility model;

[0025] Figure 2 is a cross-sectional view of a pressure reducing valve provided by the present utility model;

[0026] Figure 3 is a cross-sectional view of a sealing cover and a filtering structure provided by the present utility model;

[0027] Figure 4 is a schematic structural diagram of a filtering structure provided by the present utility model;

[0028] Figure 5 is a schematic diagram of the flow of the medium in the pressure reducing valve provided by the present utility model;

[0029] Figure 6 is a schematic structural diagram of the main body provided by the present utility model.

[0030] In the figure:

[0031] 1. Sealing cover; 11. Cover body; 111. Anti-freezing boss; 1111. Pressure relief channel; 11111. Large-diameter section; 11112. Small-diameter section; 1112. Pressure relief hole; 1113. Top plate; 112. Accommodation groove; 12. Pressure relief component; 121. First seal; 1211. Main body; 12111. Convex ring; 12112. Limit projection; 12113. Ring groove; 1212. Sealing ring; 122. First elastic member; 13. Plug; 131. Limit post; 132. Communication hole;

[0032] 2. Valve body; 21. Flow channel; 22. Contact portion; 221. Second contact inclined surface; 23. Docking portion; 24. Pressure reducing cavity; 25. Filtering cavity;

[0033] 3. Pressure reducing component; 31. Valve rod; 32. Pressure regulating spring; 33. Valve cover; 34. Pressure regulating member; 35. Support frame; 36. Second seal; 37. Pressure relief member;

[0034] 4. Filtering structure; 41. Opening; 42. Annular boss; 43. Bottom plate; 431. Limit hole; 44. First contact inclined surface;

[0035] 5. Second elastic member;

[0036] 6. Third seal. Detailed Description of the Preferred Embodiment

[0037] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present utility model and should not be construed as a limitation of the present utility model.

[0038] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0039] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] Unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is lower than that of the second feature.

[0041] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0042] As Figure 1 and Figure 2As shown in the figure, this embodiment provides a pressure reducing valve, which includes a valve body 2, a pressure reducing component 3, a filtering structure 4 and a sealing cover 1. A flow channel 21 and a pressure reducing cavity 24 communicating with the flow channel 21 are formed in the valve body 2. The sealing cover 1 is detachably arranged on the valve body 2 to form a filtering cavity 25 with the flow channel 21. The pressure reducing component 3 is arranged on the valve body 2, located in the pressure reducing cavity 24, and can reduce the pressure of the medium entering the flow channel 21 and discharge it. The filtering structure 4 is arranged in the filtering cavity 25. It should be noted that the filtering structure 4 is spaced from the inner wall of the filtering cavity 25, and the filtering structure 4 is provided with an opening 41, so that the medium can enter the filtering structure 4 along the flow channel 21 and flow out from the opening 41.

[0043] By arranging the filtering structure 4 in the flow channel 21 of the valve body 2, the medium can enter the filtering structure 4 along the flow channel 21 and flow out from the opening 41 of the filtering structure 4, improving the filtering effect on the medium and thus enhancing the use safety of the pressure reducing valve. By detachably installing the filtering structure 4 in the sealing cover 1 and detachably fixing the sealing cover 1 to the valve body 2, it is convenient to replace the filtering structure 4 in time. The spaced arrangement of the filtering structure 4 and the sealing cover 1 ensures that the medium can flow into the gap between the filtering structure 4 and the sealing cover 1 and then enter the filtering structure 4 to achieve the filtering of the medium and improve the filtering effect on the medium.

[0044] In addition, since the filtering structure 4 is arranged below the valve body 2, the impurities filtered out by the filtering structure 4 will settle under the action of their own gravity, preventing the filtered impurities from blocking the flow channel 21 and ensuring the normal operation of the pressure reducing valve.

[0045] As Figure 2 shown, the pressure reducing component 3 includes a valve stem 31, a pressure regulating spring 32, a valve cover 33, a pressure regulating member 34 and a support frame 35. The valve cover 33 is hermetically connected to the valve body 2. The support frame 35 is fixed in the valve cover 33. The valve stem 31 is connected to the support frame 35 and can telescopically move relative to the support frame 35. One end of the valve stem 31 extends into the flow channel 21, and the other end of the valve stem 31 is connected to the pressure regulating spring 32. The other end of the pressure regulating spring 32 is connected to the pressure regulating member 34. The pressure regulating member 34 can regulate the telescopic distance of the valve stem 31 relative to the support frame 35, thereby adjusting the pressure and flow rate of the discharged medium. The structure is simple and the pressure reducing effect is good. It should be noted that the pressure reducing principle and steps of the pressure reducing component 3 belong to the prior art and will not be elaborated here.

[0046] Preferably, second sealing members 36 are arranged between the valve stem 31 and the support frame 35, between the support frame 35 and the valve cover 33, and between the valve stem 31 and the valve cover 33, which can avoid the problem of medium leakage along the gaps between the valve stem 31 and the support frame 35, between the support frame 35 and the valve cover 33, and between the valve stem 31 and the valve cover 33.

[0047] In addition, since the pressure reducing component 3 can reduce the pressure of the medium to a preset pressure, enabling the medium to be discharged at a stable pressure, the pressure reducing component 3 also has good pressure stabilization performance. It can reduce the pressure of the high-pressure input medium and stabilize it to a preset low pressure before discharging, facilitating subsequent transportation and processing of the medium.

[0048] Furthermore, the pressure reducing component 3 further includes a pressure relief member 37. The pressure relief member 37 is disposed on the valve body 2 and is in communication with the flow channel 21. The pressure relief member 37 can perform pressure relief treatment on the flow channel 21, thereby ensuring the safe use of the pressure reducing valve. It should be noted that in this embodiment, a detection member can also be provided at the pressure relief member 37 to detect the pressure in the flow channel 21, facilitating the staff to perform pressure relief according to the detection information and further improving safety.

[0049] Now, in combination with Figure 2 and Figure 5 the specific flow process of the medium in the pressure reducing valve will be described. In this embodiment, the medium first enters the pressure reducing valve along the flow channel 21, and then enters the sealing cover 1. The medium in the sealing cover 1 will enter the filtering structure 4 from the outer periphery and bottom of the filtering structure 4 to achieve filtration of the medium. At this time, the filtered impurities will settle at the bottom of the sealing cover 1. The medium after filtration flows out from the opening 41 of the filtering structure 4 and enters the pressure reducing component 3 for pressure reduction treatment. The medium after the pressure reduction treatment finally discharges from the pressure reducing valve along the flow channel 21.

[0050] It is worth noting that in this embodiment, the filtering structure 4 is arranged upstream of the pressure reducing component 3 to filter the medium before it enters the pressure reducing component 3, avoiding impurities in the medium from affecting the normal operation of the pressure reducing component 3 and further improving the protection of the pressure reducing component 3. In other embodiments, the filtering structure 4 can also be arranged downstream of the pressure reducing component 3, or the filtering structure 4 can be arranged both upstream and downstream of the pressure reducing component 3. This embodiment does not make specific limitations.

[0051] In addition, in this embodiment, there are gaps between the outer periphery and bottom of the filtering structure 4 and the sealing cover 1. The medium can flow into the gaps between the outer periphery and bottom of the filtering structure 4 and the sealing cover 1 and enter the filtering structure 4 to achieve filtration of the medium. It can minimize the contact area between the filtering structure 4 and the sealing cover 1 to the greatest extent under the condition that the size of the filtering structure 4 remains unchanged, thereby maximizing the effective filtering area of the filtering structure 4, further improving the filtering efficiency of the filtering structure 4 and the filtering effect of the filtering structure 4 on the medium.

[0052] Furthermore, the sealing cover 1 is made of a transparent material. The sealing cover 1 made of a transparent material enables the staff to observe the working state of the filtering structure 4 in real time, so that the staff can replace the filtering structure 4 in time, which can not only improve the working efficiency of the pressure reducing valve, but also further improve the safety of the pressure reducing valve. It can be understood that the medium can be a liquid medium or a gaseous medium, and the specific type of the medium is not specifically limited in this embodiment.

[0053] It should be noted that, in this embodiment, the sealing cover 1 is made of PC (Polycarbonate) material. The PC material has excellent mechanical properties and is easy to process and form. In other embodiments, the sealing cover 1 can also be made of PMMA (polymethyl methacrylate) material, PS (Polystyrene) material or other transparent materials, which are not specifically limited in this embodiment.

[0054] It is worth noting that the pores of the filtering structure 4 will be blocked during long-term operation, affecting the filtering effect, and need to be cleaned or replaced. In order to facilitate the cleaning or replacement of the filtering structure 4, the pressure reducing valve usually needs to be provided with a detachable sealing cover 1 at the position of the filtering structure 4. However, when the ambient temperature is too low, the medium inside the pressure reducing valve will freeze and expand in volume. Due to the material of the sealing cover 1, the expanded medium is likely to cause the sealing cover 1 to crack and damage, resulting in medium leakage and affecting safety.

[0055] As Figure 2 and Figure 3 shown, to solve the above problems, the sealing cover 1 provided in this embodiment includes a cover body 11 and a pressure relief component 12. An anti-freezing boss 111 is arranged inside the cover body 11, and a pressure relief channel 1111 is formed in the anti-freezing boss 111. One end of the pressure relief channel 1111 is communicated with the inside of the cover body 11 through a pressure relief hole 1112; the pressure relief component 12 includes a first sealing member 121 and a first elastic member 122. The first sealing member 121 seals the inner wall of the pressure relief channel 1111 and can slide in the pressure relief channel 1111 after overcoming the elastic force of the first elastic member 122.

[0056] When the medium in the sealing cover 1 expands in volume due to changing from a liquid to a solid at low temperature, the medium can push the first sealing member 121 and compress the first elastic member 122, thereby increasing the expansion space inside the sealing cover 1 and preventing the sealing cover 1 made of transparent material from cracking due to the volume expansion of the medium; when the ambient temperature rises and the medium changes from a solid to a liquid, the first sealing member 121 fits against the outer edge of the pressure relief hole 1112 under the action of the first elastic member 122 to form a sealing effect, preventing the medium from leaking and ensuring the normal use of the product.

[0057] The sealing cover 1 can change the internal expansion space according to the volume change of the medium, and will not burst or be damaged due to the solidification and expansion of the medium when used in a low-temperature environment, ensuring the normal use of the product and improving safety.

[0058] In this embodiment, the other end of the pressure relief channel 1111 communicates with the outside of the cover body 11. When the first seal 121 slides, the spaces on both sides of the pressure relief channel 1111 on both sides of the first seal 121 are connected. After the unfrozen medium pushes the first seal 121 away, it can flow to the outside of the cover body 11 through the other end of the pressure relief channel 1111, ensuring that the pressure inside the sealing cover 1 will not be too large to burst the sealing cover 1, improving safety.

[0059] Specifically, the pressure relief channel 1111 includes a large-diameter section 11111 and a small-diameter section 11112. The small-diameter section 11112 is located between the large-diameter section 11111 and the pressure relief hole 1112. The first seal 121 can form a seal with the small-diameter section 11112. That is to say, when the first seal 121 compresses the first elastic member 122 and moves to the large-diameter section 11111, a gap is generated between the first seal 121 and the pressure relief channel 1111, enabling the medium to flow to the outside of the cover body 11 through the gap between the first seal 121 and the large-diameter section 11111, ensuring that the pressure inside the sealing cover 1 will not be too large to burst the sealing cover 1, improving safety.

[0060] At the same time, in order to ensure that the first seal 121 does not shift within the large-diameter section 11111, a plurality of limiting protrusions 12112 are convexly provided at intervals on the outer periphery of the first seal 121. The plurality of limiting protrusions 12112 slide and abut against the inner wall of the large-diameter section 11111 to radially limit the first seal 121, so as to ensure that the first seal 121 is always on the axis of the pressure relief channel 1111.

[0061] In some embodiments, a pressure relief groove is formed in the inner wall of the pressure relief channel 1111. When the first seal 121 moves to the range of the pressure relief groove, the pressure relief groove connects the spaces on both sides of the pressure relief channel 1111 on both sides of the first seal 121. This structure can also enable the medium to flow to the outside of the cover body 11.

[0062] Among them, the movement of the first seal 121 to within the range of the pressure relief groove means that, in the initial state, the position of the first seal 121 in the axial direction of the pressure relief passage 1111 is located at one end of the pressure relief groove. At this time, the spaces on both sides of the first seal 121 in the axial direction of the pressure relief passage 1111 are not connected. As the pressure inside the cover 11 increases, the first seal 121 compresses the first elastic member 122. When the position of the first seal 121 in the axial direction of the pressure relief passage 1111 is within the range of the pressure relief groove in the axial direction of the pressure relief passage 1111, the medium in the pressure relief passage 1111 can bypass the first seal 121 through the pressure relief groove.

[0063] It should be noted that in the above structure, the limiting protrusion 12112 is slidably disposed in the corresponding pressure relief groove, and the arrangement of the limiting protrusion 12112 prevents the main body 1211 from rotating axially.

[0064] As Figure 3 and Figure 6 shown, the first seal 121 includes a main body 1211 and a sealing ring 1212. The main body 1211 is provided with an annular groove 12113. The sealing ring 1212 is sleeved on the main body 1211 and is located in the annular groove 12113. The sealing ring 1212 is configured to seal the gap between the main body 1211 and the side wall of the pressure relief passage 1111.

[0065] The arrangement of the sealing ring 1212 can better seal the gap between the main body 1211 and the side wall of the pressure relief passage 1111, ensuring that the medium does not leak from the pressure relief passage 1111 when the pressure inside the cover 11 has not risen high enough to push open the first seal 121.

[0066] Specifically, the main body 1211 includes two convex rings 12111 arranged at intervals along the axial direction. An annular groove 12113 is formed between the two convex rings 12111. A limiting protrusion 12112 protrudes from the outer periphery of the convex ring 12111 close to the first elastic member 122. The pressure relief grooves all extend along the axial direction of the pressure relief passage 1111. The limiting protrusion 12112 is slidably disposed in the pressure relief groove, and there is a gap between the limiting protrusion 12112 and the pressure relief groove.

[0067] In this embodiment, the sealing ring 1212 is located on the side of the limiting protrusion 12112 away from the first elastic member 122. When the limiting protrusion 12112 abuts against the end of the pressure relief groove or the step between the large-diameter section 11111 and the small-diameter section 11112, it can ensure that the sealing ring 1212 is in sealing contact with the inner wall of the pressure relief passage 1111. At this time, the end of the pressure relief groove can also limit the main body 1211 through the limiting protrusion 12112, and the first elastic member 122 will not push the first seal 121 out of the pressure relief passage 1111.

[0068] In some embodiments, the inner diameter of the pressure relief hole 1112 is smaller than that of the pressure relief channel 1111, so as to limit the first seal 121 through the outer periphery of the pressure relief hole 1112 and prevent the first seal 121 from being pushed out of the pressure relief channel 1111.

[0069] In this embodiment, a plurality of pressure relief grooves are arranged at intervals along the circumferential direction on the inner wall of the pressure relief channel 1111, and a plurality of limiting protrusions 12112 are protruded at intervals corresponding to the plurality of pressure relief grooves on the outer periphery of the convex ring 12111 close to the first elastic member 122. The plurality of limiting protrusions 12112 can make the guiding force received by the first seal 121 during the movement in the pressure relief channel 1111 be evenly distributed, and prevent the first seal 121 from shifting and causing sealing failure.

[0070] Furthermore, the anti-freezing boss 111 includes a top plate 1113, the pressure relief hole 1112 is opened on the top plate 1113, and the top plate 1113 can abut against the first seal 121 to limit the stroke of the first seal 121 and prevent the first seal 121 from being disengaged from the pressure relief channel 1111 under the elastic force of the first elastic member 122.

[0071] In this embodiment, in order to be able to repair and replace the first elastic member 122 and the first seal 121, the sealing cover 1 further includes a plug 13, the plug 13 is detachably connected to the cover body 11, the plug 13 can block one end of the pressure relief channel 1111 communicating with the outside of the cover body 11, and one end of the first elastic member 122 abuts against the plug 13. Using the plug 13 to block the pressure relief channel 1111 can improve the efficiency of repairing and replacing the first elastic member 122 and the first seal 121 on the premise of ensuring the normal function of the pressure relief channel 1111, reduce the working intensity of the operator, and improve the efficiency.

[0072] Furthermore, the plug 13 protrudes with a limiting post 131, the first elastic member 122 abuts against the plug 13 and is sleeved on the periphery of the limiting post 131. The limiting post 131 can provide a limit for one end of the first elastic member 122 and prevent the first elastic member 122 from bending and causing a jamming situation. And by using the plug 13 to abut against the first elastic member 122, when the plug 13 is removed, the operator can directly take out the first elastic member 122, which is convenient for operation.

[0073] As Figure 3 shown, in order to connect the pressure relief channel 1111 with the outside of the cover body 11, the plug 13 is provided with a communication hole 132, so that the medium entering the pressure relief channel 1111 can be discharged through the communication hole 132. Arranging the communication hole 132 on the plug 13 is convenient for cleaning and maintenance or direct replacement when the communication hole 132 is blocked. The communication hole 132 is preferably opened on the top surface of the limiting post 131, so as to prevent the first elastic member 122 from blocking part or all of the communication hole 132.

[0074] It is worth noting that the flow channel 21 in the valve body 2 does not extend in a straight line, but extends in a zigzag manner according to the structure of the valve body 2. In order to facilitate the medium to flow out from the opening 41 of the filter structure 4 after being filtered by the filter structure 4, an annular abutment portion 22 is provided in the valve body 2, and one end of the filter structure 4 with an opening 41 abuts against the abutment portion 22. At this time, the medium can only enter the filter through the side wall and / or bottom surface of the filter structure 4, and the medium filtered by the filter structure 4 flows out from the opening 41, thereby ensuring the filtering effect.

[0075] The filter structure 4 is provided with an opening 41 at one end thereof abutting against the abutment portion 22, which can ensure stability. However, when the medium speed is too high, the medium will impact the bottom of the filter structure 4 and cause shaking, resulting in instability. To solve this problem, the filter structure 4 includes a bottom plate 43 arranged opposite to the opening 41, the bottom plate 43 is provided with a limiting hole 431, and the antifreeze boss 111 is passed through the limiting hole 431 and abuts against the inner wall of the limiting hole 431 in the circumferential direction. The antifreeze boss 111 can fix the bottom of the filter structure 4, thereby improving the stability of the filter structure 4 and ensuring that the filter structure 4 does not shake when subjected to the impact of the medium.

[0076] like Figure 2 and Figure 3 As shown, the pressure reducing valve also includes a second elastic member 5, and an annular boss 42 is provided on the outer peripheral wall of one end of the filter structure 4 where the opening 41 is set. The second elastic member 5 is sleeved on the outer periphery of the filter structure 4, and one end of the second elastic member 5 abuts against the end face of the annular boss 42 away from the opening 41, and the other end of the second elastic member 5 abuts against the inner cavity wall of the sealing cover 1.

[0077] The second elastic member 5 is used to make the filter structure 4 abut against the abutment portion 22, and an elastic abutment pressure is always applied to the filter structure 4. This can avoid the problem of a gap between the filter structure 4 and the abutment portion 22 caused by low processing precision, ensure the sealing between the filter structure 4 and the abutment portion 22, reduce the requirements for processing precision, and reduce costs.

[0078] It should be noted that, in the present embodiment, since the bottom plate 43 is arranged opposite to the opening 41, the filter structure 4 is a straight cylindrical structure with a one-way opening. The second elastic member 5 is a compression spring, which is sleeved on the outer periphery of the straight cylindrical filter structure 4, and the two ends of the compression spring are respectively abutted against the annular boss 42 and the inner cavity wall of the sealing cover 1 to save the installation space of the compression spring and the filter structure 4. The compression spring has a simple structure and high elasticity. In other embodiments, the filter structure 4 can be a one-way opening conical structure or a one-way opening cubic structure or other one-way opening structure, and the fixing member can also be other elastic structures, which are not specifically limited in the present embodiment.

[0079] When the filter structure 4 needs to be replaced, first remove the sealing cover 1. At this time, the compression spring sleeved on the outer periphery of the filter structure 4 resets under the action of its own elasticity, and the opening 41 of the filter structure 4 is no longer docked and fixed with the abutting portion 22. Then remove the filter structure 4 and dock the opening 41 of the new filter structure 4 with the abutting portion 22. Subsequently, sleeved the compression spring on the outer periphery of the new filter structure 4 again, and reinstall the sealing cover 1 so that both ends of the compression spring abut against the annular boss 42 of the new filter structure 4 and the sealing cover 1 respectively, completing the replacement of the filter structure 4.

[0080] In this embodiment, the pressure relief hole 1112 is located at the center of the filter chamber 25. Since the medium in the filter chamber 25 is cooled and solidified by the low-temperature environment outside the filter chamber 25, the medium in the filter chamber 25 solidifies gradually from the outside to the inside. That is to say, the medium in the middle position of the filter chamber 25 solidifies last. This enables the medium in the filter chamber 25 to be squeezed towards the middle position of the filter chamber 25 when solidifying, so that the liquid medium can all be discharged from the pressure relief hole 1112 of the anti-freezing boss 111, avoiding the problem that the medium in the filter chamber 25 is difficult to discharge due to the reduction of fluidity caused by solidification.

[0081] Among them, the anti-freezing boss 111 is connected to the bottom plate 43 of the cover body 11, and the top of the cover body 11 is detachably connected to the valve body 2. In order to make the pressure relief hole 1112 located at the center of the cover body 11, the anti-freezing boss 111 is arranged at the center of the bottom plate 43. Along the height direction of the cover body 11, the height of the anti-freezing boss 111 is 50% of the height of the filter chamber 25. Specifically, the bottom plate 43 is circular, and the axis of the anti-freezing boss 111 passes through the center of the bottom plate 43. This structure makes the medium at the position of the pressure relief hole 1112 solidify last.

[0082] It can be understood that due to the fluidity of the medium, in this embodiment, the height of the anti-freezing boss 111 is 40% - 60% of the height of the filter chamber 25, which can ensure that the medium near the anti-freezing boss 111 does not solidify preferentially. Specifically, the height of the anti-freezing boss 111 is 40%, 45%, 50%, 55% or 60% of the height of the filter chamber 25.

[0083] It is worth noting that in this embodiment, the bottom surface of the filter chamber 25 is the lowest position of the cover body 11, and the top of the filter chamber 25 is the highest position of the valve body 2 at the filter chamber 25. In other embodiments, the cover body 11 can be connected to the valve body 2 at other angles, but the height direction of the filter chamber 25 refers to the direction perpendicular to the bottom surface of the cover body 11 and pointing to the inside of the filter chamber 25.

[0084] Since the filtering structure 4 is abutted against the abutting portion 22 by the elastic force of the second elastic member 5, when the medium velocity is too high, the medium will impact the bottom of the filtering structure 4 and cause instability due to shaking. To solve this problem, the bottom plate 43 is provided with a limiting hole 431, and the anti-freezing boss 111 is inserted through the limiting hole 431 and circumferentially abuts against the inner wall of the limiting hole 431. The anti-freezing boss 111 can fix the bottom of the filtering structure 4, thereby improving the stability of the filtering structure 4 and ensuring that the filtering structure 4 does not shake when bearing the impact of the medium.

[0085] To ensure the sealing performance between the filtering structure 4 and the abutting portion 22, a first abutting inclined surface 44 is provided on the outer peripheral wall of the end of the filtering structure 4 where the opening 41 is provided, and a second abutting inclined surface 221 is provided on the inner wall of the end of the abutting portion 22 facing the filtering structure 4. The first abutting inclined surface 44 and the second abutting inclined surface 221 are abutted and arranged. Since the filtering structure 4 is abutted against the abutting portion 22 by the elastic force of the compressed spring, this enables the first abutting inclined surface 44 and the second abutting inclined surface 221 to fit together, reducing the requirement for processing accuracy and also ensuring the sealing performance when there is slight wear on the filtering structure 4 and / or the abutting portion 22.

[0086] In this embodiment, the annular boss 42 abuts and seals with the abutting portion 22, that is to say, the first abutting inclined surface 44 is provided on the outer peripheral wall of the annular boss 42.

[0087] As Figure 3 shown, to improve the abutting accuracy between the compression spring and the sealing cover 1, in this embodiment, the sealing cover 1 is provided with a receiving groove 112, and one end of the compression spring that abuts against the inner cavity wall of the sealing cover 1 is limited and fixed in the receiving groove 112. By providing the receiving groove 112 on the sealing cover 1, it is possible to prevent the compression spring from shifting when installing the sealing cover 1 and ensure the stable docking between the compression spring and the sealing cover 1.

[0088] As Figure 2 shown, the valve body 2 is provided with a docking portion 23, and the sealing cover 1 is detachably connected and sealed and fixed with the docking portion 23. Specifically, in this embodiment, the sealing cover 1 is provided with an external thread, and the docking portion 23 is provided with an internal thread. The docking portion 23 is sleeved on the outer periphery of the sealing cover 1 and is thread-fixed with the docking portion 23. Thread fixing has high fixing strength and is convenient for disassembly and assembly. In other embodiments, the sealing cover 1 can also be plugged and fixed with the docking portion 23, and this embodiment does not make specific limitations.

[0089] In addition, in this embodiment, the pressure reducing valve further includes a third seal 6, wherein the third seal 6 is sleeved on the outer periphery of the seal cover 1, and the third seal 6 is clamped between the seal cover 1 and the docking portion 23. By providing the third seal 6 between the seal cover 1 and the docking portion 23 and making the third seal 6 interference-fit with both the seal cover 1 and the docking portion 23, the sealed fixation between the seal cover 1 and the docking portion 23 can be ensured, preventing the medium from leaking along the gap between the seal cover 1 and the docking portion 23 and ensuring the stable pressure in the flow channel 21.

[0090] It should be noted that, in this embodiment, the second seal 36 and / or the third seal 6 is / are O-ring rubber seals. Rubber materials have good elasticity and wear resistance, are inexpensive, and have a long service life. In other embodiments, the second seal 36 and / or the third seal 6 can also be other sealing structures, and this embodiment does not make specific limitations.

[0091] The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A sealing cover, characterized in that, Comprising: A cover body (11), within which an anti-freezing boss (111) is provided. The anti-freezing boss (111) is provided with a pressure relief passage (1111), and one end of the pressure relief passage (1111) communicates with the interior of the cover body (11) through a pressure relief hole (1112); A pressure relief assembly (12), including a first seal (121) and a first elastic member (122). The first seal (121) seals the inner wall of the pressure relief passage (1111) and can slide within the pressure relief passage (1111) after overcoming the elastic force of the first elastic member (122).

2. The seal cover according to claim 1, characterized in that, The first seal (121) includes a main body (1211) and a sealing ring (1212). The main body (1211) is provided with an annular groove (12113), and the sealing ring (1212) is sleeved on the main body (1211) and located within the annular groove (12113). The sealing ring (1212) is configured to seal the gap between the main body (1211) and the side wall of the pressure relief passage (1111).

3. The sealing cover according to claim 1, characterized in that, The other end of the pressure relief passage (1111) communicates with the outside of the cover body (11). When the first seal (121) slides, the spaces on both sides of the first seal (121) in the pressure relief passage (1111) are connected.

4. The sealing cover according to claim 3, characterized in that, The pressure relief passage (1111) includes a large-diameter section (11111) and a small-diameter section (11112). The small-diameter section (11112) is located between the large-diameter section (11111) and the pressure relief hole (1112), and the first seal (121) can form a seal with the small-diameter section (11112).

5. The seal cover according to claim 4, characterized in that, A plurality of limiting protrusions (12112) are spaced and protruded on the outer periphery of the first seal (121), and the plurality of limiting protrusions (12112) slide and abut against the inner wall of the large-diameter section (11111) to radially limit the first seal (121).

6. The seal cover according to claim 1, wherein, The seal cover further includes a plug (13), which is detachably connected to the other end of the pressure relief passage (1111). One end of the first elastic member (122) abuts against the plug (13), and the other end of the first elastic member (122) abuts against the first seal (121).

7. The sealing cover according to claim 6, characterized in that, The plug (13) protrudes a limiting post (131), and the first elastic member (122) abuts against the plug (13) and is sleeved on the periphery of the limiting post (131).

8. A pressure reducing valve, characterized in that, The pressure reducing valve includes the seal cover according to any one of claims 1 to 7, and further includes: A valve body (2), within which a flow passage (21) and a pressure reducing chamber (24) communicating with the flow passage (21) are provided. The seal cover is detachably arranged on the valve body (2) to form a filtering chamber (25) with the flow passage (21); A pressure reducing assembly (3), arranged in the pressure reducing chamber (24); A filtering structure (4), arranged in the filtering chamber (25).

9. The pressure reducing valve according to claim 8, characterized in that The filtering structure (4) includes a bottom plate (43), and the anti-freezing boss (111) passes through the bottom plate (43).

10. The pressure reducing valve according to claim 8, characterized in that, The pressure relief hole (1112) is located at the center of the filtering chamber (25).

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