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 volume pressure relief assembly, an anti-freezing boss is arranged in a cover body, a pressure relief channel is formed in the anti-freezing boss, and one end of the pressure relief channel communicates 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, the first sealing piece is arranged in the pressure relief channel, and the first elastic piece is configured to drive the first sealing piece to seal the pressure relief hole. 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 water services, 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 solidification 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 this purpose, 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 component, comprising a first sealing member and a first elastic member. The first sealing member is arranged in the pressure relief channel, and the first elastic member is configured to drive the first sealing member to seal the pressure relief hole.

[0009] As an optional scheme of the above sealing cover, the pressure relief component further comprises a sealing ring. The anti-freezing boss comprises a top plate, the pressure relief hole is opened on the top plate, the sealing ring is arranged in the pressure relief channel and abuts against the top plate, the sealing ring surrounds the outer periphery of the pressure relief hole, and the first sealing member is in sealing abutment with the sealing ring.

[0010] As an optional scheme of the above sealing cover, a plug is arranged at the other end of the pressure relief channel, and the plug is detachably connected to the cover body.

[0011] As an alternative to the above-mentioned sealing cover, the plug is provided with a communication hole to communicate the pressure relief channel with the outside of the cover body, and there is a gap between the first seal and the inner wall of the pressure relief channel.

[0012] As an alternative to the above-mentioned sealing cover, the first seal is a sealing ball.

[0013] As an alternative to the above-mentioned sealing cover, the diameter of the sealing ball is smaller than the inner diameter of the pressure relief channel.

[0014] As an alternative to the above-mentioned sealing cover, the plug is provided with a protruding 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 provided 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 open 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 and prevent the medium from leaking out, 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 crack 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. Description of the Drawings

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

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

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

[0027] Figure 4 is a schematic structural view of the 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] In the figure:

[0030] 1. Sealing cover; 11. Cover body; 111. Anti-freezing boss; 1111. Pressure relief channel; 1112. Pressure relief hole; 1113. Top plate; 112. Accommodating groove; 12. Pressure relief component; 121. First sealing member; 122. First elastic member; 123. Sealing ring; 13. Plug; 131. Limit post; 132. Communication hole;

[0031] 2. Valve body; 21. Flow channel; 22. Contact portion; 221. Second contact inclined surface; 23. Docking portion; 24. Pressure reducing cavity; 25. Filtering cavity;

[0032] 3. Pressure reducing component; 31. Valve rod; 32. Pressure regulating spring; 33. Valve cover; 34. Pressure regulating member; 35. Support frame; 36. Second sealing member; 37. Pressure relief member;

[0033] 4. Filtering structure; 41. Opening; 42. Annular boss; 43. Bottom plate; 431. Limit hole; 44. First contact inclined surface;

[0034] 5. Second elastic member;

[0035] 6. Third sealing member. Detailed implementation manners

[0036] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals denote the same or similar elements or elements having 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 limiting the present utility model.

[0037] 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 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 cannot be construed as a limitation on the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0038] Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" shall 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.

[0039] Unless otherwise clearly specified and defined, 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 between them. 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", "beneath" and "under" 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 less than that of the second feature.

[0040] The technical solution of the present utility model will be further described below in conjunction with the drawings and through specific embodiments.

[0041] As Figure 1 and Figure 2 shown, 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, and the pressure reducing component 3 is arranged 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 arranged at an interval 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.

[0042] 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 service 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 a timely manner. 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.

[0043] 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, avoiding the blockage of the flow channel 21 by the filtered impurities and ensuring the normal operation of the pressure reducing valve.

[0044] As Figure 2 shown, the pressure reducing assembly 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 inside the valve cover 33. The valve stem 31 is connected to the support frame 35. The valve stem 31 can telescopically move relative to the support frame 35. One end of the valve stem 31 extends into the flow channel 21. 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 assembly 3 belong to the prior art and will not be elaborated here.

[0045] Preferably, second seals 36 are provided 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.

[0046] In addition, since the pressure reducing assembly 3 can reduce the pressure of the medium to a preset pressure and enable the medium to be discharged at a stable pressure, the pressure reducing assembly 3 also has good pressure stability, can reduce the pressure of the input high-pressure medium and stabilize it to a preset low pressure before discharging, which is convenient for subsequent transportation and treatment of the medium.

[0047] Furthermore, the pressure relief component 3 further includes a pressure relief element 37. The pressure relief element 37 is arranged on the valve body 2 and is in communication with the flow channel 21. The pressure relief element 37 can relieve the pressure of the flow channel 21, thereby ensuring the safe use of the pressure reducing valve. It should be noted that in this embodiment, a detection element can also be arranged at the pressure relief element 37 to detect the pressure in the flow channel 21, facilitating the staff to relieve the pressure according to the detection information and further improving the safety.

[0048] 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 the bottom of the filtering structure 4 to realize the filtering of the medium. At this time, the filtered impurities will settle at the bottom of the sealing cover 1. The medium after filtering flows out from the opening 41 of the filtering structure 4 and flows into the pressure relief component 3 for pressure relief processing. The medium after the pressure relief processing finally discharges from the pressure reducing valve along the flow channel 21.

[0049] It is worth noting that in this embodiment, the filtering structure 4 is arranged upstream of the pressure relief component 3 to filter the medium before it enters the pressure relief component 3, avoiding the impurities in the medium from affecting the normal operation of the pressure relief component 3 and further improving the protection of the pressure relief component 3. In other embodiments, the filtering structure 4 can also be arranged downstream of the pressure relief component 3, or the filtering structure 4 can be arranged both upstream and downstream of the pressure relief component 3. This embodiment does not make specific limitations.

[0050] In addition, in this embodiment, there are gaps between the outer periphery and the bottom of the filtering structure 4 and the sealing cover 1. The medium can flow into the gap between the outer periphery and the bottom of the filtering structure 4 and the sealing cover 1 and enter the filtering structure 4 to realize the filtering 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.

[0051] Furthermore, the sealing cover 1 is made of a transparent material. The sealing cover 1 made of a transparent material can facilitate 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. This embodiment does not make specific limitations on the specific type of the medium.

[0052] It should be noted that in this embodiment, the sealing cover 1 is made of PC (Polycarbonate), and 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), PS (Polystyrene) or other transparent materials, and this embodiment does not make specific limitations.

[0053] 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. To facilitate the cleaning or replacement of the filtering structure 4, a detachable sealing cover 1 is usually required to be provided 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 rupture and damage, resulting in medium leakage and affecting safety.

[0054] 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 provided 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 seal 121 and a first elastic member 122. The first seal 121 is disposed in the pressure relief channel 1111, and the first elastic member 122 is configured to drive the first seal 121 to seal the pressure relief hole 1112.

[0055] When the medium in the sealing cover 1 expands in volume due to changing from a liquid to a solid at low temperature, the unfrozen medium can push open the first seal 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 rupturing 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 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.

[0056] The sealing cover 1 can change the internal expansion space according to the volume change of the medium, and will not rupture 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.

[0057] In this embodiment, the other end of the pressure relief channel 1111 penetrates to the outside of the cover 11. When the unfrozen medium pushes open the first seal 121, it can flow to the outside of the cover 11 through the other end of the pressure relief channel 1111, ensuring that the pressure inside the sealing cover 1 will not be too high to burst the sealing cover 1, thus improving safety.

[0058] It should be noted that the first seal 121 is spaced from the inner wall of the pressure relief channel 1111. When the medium in the sealing cover 1 expands in volume due to changing from a liquid to a solid at low temperature, when the unfrozen medium pushes open the first seal 121, it can enter the pressure relief channel 1111 and flow to the outside of the cover 11 through the gap between the pressure relief channel 1111 and the first seal 121.

[0059] In some embodiments, the first seal 121 has a through hole located outside the sealing area between the first seal 121 and the pressure relief hole 1112. When the first seal 121 seals the pressure relief hole 1112, the through hole is located outside the edge of the pressure relief hole 1112, and the medium will not pass through the through hole. When the first seal 121 is pushed open by the medium, the medium can flow to the outside of the cover 11 through the through hole.

[0060] In this embodiment, the first seal 121 is a sealing ball and the pressure relief hole 1112 is a round hole. When the sealing ball is driven by the first elastic member 122 to approach and abut against the outer edge of the pressure relief hole 1112, the pressure relief hole 1112 can be sealed.

[0061] In order to enable the medium entering the pressure relief channel 1111 to be discharged, the diameter of the sealing ball is smaller than the inner diameter of the pressure relief channel 1111.

[0062] Furthermore, the pressure relief assembly 12 further includes a sealing ring 123. The anti-freezing boss 111 includes a top plate 1113, the pressure relief hole 1112 is formed in the top plate 1113, the sealing ring 123 is disposed in the pressure relief channel 1111 and abuts against the top plate 1113, the sealing ring 123 surrounds the outer circumference of the pressure relief hole 1112, and the first seal 121 is in sealing abutment with the sealing ring 123. Since the contact between the sealing ball and the outer edge of the pressure relief hole 1112 is a hard contact and the sealing performance is poor, when the sealing ball or the outer edge of the pressure relief hole 1112 is slightly worn, the sealing performance will be affected, resulting in medium leakage during daily use. By adding the sealing ring 123, the sealing performance is greatly improved, and even if the sealing ball is slightly worn, the sealing ball can offset the influence caused by this part of the wear when squeezing the sealing ring 123, thus ensuring that the medium will not leak during daily use.

[0063] In this embodiment, in order to be able to repair and replace the first elastic member 122 and the first seal 121, a plug 13 is provided at the other end of the pressure relief passage 1111. The plug 13 is detachably connected to the cover 11, and the plug 13 can block one end of the pressure relief passage 1111 communicating with the outside of the cover 11. By using the plug 13 to block the pressure relief passage 1111, the efficiency of repairing and replacing the first elastic member 122 and the first seal 121 can be improved on the premise of ensuring the normal function of the pressure relief passage 1111, the working intensity of the operator can be reduced, and the efficiency can be improved.

[0064] Further, the plug 13 is provided with a limiting post 131 protruding therefrom. The first elastic member 122 abuts against the plug 13 and is sleeved around the limiting post 131. The limiting post 131 can provide a limit for one end of the first elastic member 122 to prevent the first elastic member 122 from bending and getting stuck. 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.

[0065] As Figure 3 shown, in order to connect the pressure relief passage 1111 with the outside of the cover 11, the plug 13 is provided with a communication hole 132, so that the medium entering the pressure relief passage 1111 can be discharged through the communication hole 132. The provision of the communication hole 132 on the plug 13 facilitates 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 to prevent the first elastic member 122 from blocking part or all of the communication hole 132.

[0066] It should be noted that the flow passage 21 in the valve body 2 does not extend linearly, but extends tortuously according to the structure of the valve body 2. In order to facilitate the medium to flow out from the opening 41 of the filtering structure 4 after being filtered by the filtering structure 4, an annular abutting portion 22 is provided in the valve body 2. One end of the filtering structure 4 provided with the opening 41 abuts against the abutting portion 22. At this time, the medium can only enter the filtering result from the side wall and / or bottom surface of the filtering structure 4, and the medium filtered by the filtering structure 4 flows out from the opening 41 to ensure the filtering effect.

[0067] One end of the filtering structure 4 provided with the opening 41 abuts against the abutting portion 22, which can ensure stability. However, 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 filtering structure 4 includes a bottom plate 43. The bottom plate 43 is provided with a limiting hole 431. The anti-freezing boss 111 passes through the limiting hole 431 and circumferentially abuts against the inner wall of the limiting hole 431. Among them, the bottom plate 43 is disposed opposite to the opening 41. 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.

[0068] 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.

[0069] 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, which 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.

[0070] It should be noted that, in this embodiment, since the bottom plate 43 is arranged relative 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. The two ends of the compression spring are respectively in contact with 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 conical structure with a one-way opening, a cubic structure with a one-way opening, or other one-way opening structures, and the fixing member can also be other elastic structures, which are not specifically limited in this embodiment.

[0071] When the filter structure 4 needs to be replaced, the sealing cover 1 is first removed. At this time, the compression spring sleeved on the outer periphery of the filter structure 4 is reset under the action of its own elasticity, and the opening 41 of the filter structure 4 is no longer docked and fixed with the abutment 22. Then the filter structure 4 is removed and the opening 41 of the new filter structure 4 is docked with the abutment 22. Then, the compression spring is re-sleeved on the outer periphery of the new filter structure 4, and the sealing cover 1 is reinstalled so that the two ends of the compression spring are respectively abutted with the annular boss 42 of the new filter structure 4 and the sealing cover 1, thereby completing the replacement of the filter structure 4.

[0072] In this embodiment, the pressure relief hole 1112 is located in the center of the filter cavity 25. Since the medium in the filter cavity 25 is cooled and solidified by the low temperature environment outside the filter cavity 25, the medium in the filter cavity 25 gradually solidifies from the outside to the inside. In other words, the medium in the middle of the filter cavity 25 is the last to solidify. This allows the medium in the filter cavity 25 to be squeezed toward the middle of the filter cavity 25 during solidification, so that the liquid medium can be discharged from the pressure relief hole 1112 of the antifreeze boss 111, avoiding the problem of the medium in the filter cavity 25 being difficult to discharge due to reduced fluidity caused by solidification.

[0073] Among them, the anti-freezing boss 111 is connected to the bottom plate 43 of the cover body 11. 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 filtering cavity 25. Specifically, the bottom plate 43 is circular, and the axis of the anti-freezing boss 111 passes through the center of the circle of the bottom plate 43. This structure makes the medium at the position of the pressure relief hole 1112 the last to solidify.

[0074] 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 filtering cavity 25, which can ensure that the medium near the anti-freezing boss 111 will not solidify preferentially. Specifically, the height of the anti-freezing boss 111 is 40%, 45%, 50%, 55% or 60% of the height of the filtering cavity 25.

[0075] It is worth noting that in this embodiment, the bottom surface of the filtering cavity 25 is the lowest position of the cover body 11, and the top of the filtering cavity 25 is the highest position of the valve body 2 at the filtering cavity 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 filtering cavity 25 refers to the direction perpendicular to the bottom surface of the cover body 11 and pointing to the inside of the filtering cavity 25.

[0076] In order 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 one 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 one 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 arranged in abutment. Since the filtering structure 4 is abutted against the abutting portion 22 by the elastic force of the compression spring, this enables the first abutting inclined surface 44 and the second abutting inclined surface 221 to fit together, reducing the requirement for machining accuracy and also ensuring the sealing performance when there is slight wear on the filtering structure 4 and / or the abutting portion 22.

[0077] 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.

[0078] As Figure 3 shown, in order to improve the abutting accuracy between the compression spring and the sealing cover 1, in this embodiment, a receiving groove 112 is opened on the sealing cover 1, 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 opening 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.

[0079] As Figure 2As shown in the figure, a docking portion 23 is provided on the valve body 2, and the sealing cover 1 is detachably connected to and fixedly sealed with the docking portion 23. Specifically, in this embodiment, an external thread is provided on the sealing cover 1, and an internal thread is provided on the docking portion 23. The docking portion 23 is sleeved on the outer periphery of the sealing cover 1 and is threadedly fixed to the docking portion 23. Threaded fixing has high fixing strength and is convenient for disassembly and assembly. In other embodiments, the sealing cover 1 can also be fixedly connected to the docking portion 23 by plugging, and no specific limitation is made in this embodiment.

[0080] In addition, in this embodiment, the pressure reducing valve further includes a third sealing member 6. Among them, the third sealing member 6 is sleeved on the outer periphery of the sealing cover 1, and the third sealing member 6 is clamped between the sealing cover 1 and the docking portion 23. By providing the third sealing member 6 between the sealing cover 1 and the docking portion 23 and making the third sealing member 6 have an interference fit with both the sealing cover 1 and the docking portion 23, the sealing and fixing between the sealing cover 1 and the docking portion 23 can be ensured, preventing the medium from leaking along the gap between the sealing cover 1 and the docking portion 23 and ensuring the stable pressure in the flow channel 21.

[0081] It should be noted that, in this embodiment, the second sealing member 36 and / or the third sealing member 6 is an O-ring. The rubber material has good elasticity and wear resistance, is inexpensive, and has a long service life. In other embodiments, the second sealing member 36 and / or the third sealing member 6 can also be other sealing structures, and no specific limitation is made in this embodiment.

[0082] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

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 channel (1111), and one end of the pressure relief channel (1111) communicates with the interior of the cover body (11) through a pressure relief hole (1112); A pressure relief component (12), including a first seal (121) and a first elastic member (122). The first seal (121) is disposed within the pressure relief channel (1111), and the first elastic member (122) is configured to drive the first seal (121) to seal the pressure relief hole (1112).

2. The seal cover according to claim 1, characterized in that, The pressure relief component (12) further includes a sealing ring (123). The anti-freezing boss (111) includes a top plate (1113), the pressure relief hole (1112) is opened on the top plate (1113), the sealing ring (123) is disposed within the pressure relief channel (1111) and abuts against the top plate (1113), the sealing ring (123) surrounds the outer periphery of the pressure relief hole (1112), and the first seal (121) is in sealing contact with the sealing ring (123).

3. The sealing cover according to claim 1, characterized in that, A plug (13) is provided at the other end of the pressure relief channel (1111), and the plug (13) is detachably connected to the cover body (11).

4. The seal cover according to claim 3, characterized in that, The plug (13) is provided with a communication hole (132) to enable the pressure relief channel (1111) to communicate with the outside of the cover body (11), and there is a gap between the first seal (121) and the inner wall of the pressure relief channel (1111).

5. The sealing cover according to claim 3, characterized in that, The first seal (121) is a sealing ball.

6. The seal cover according to claim 5, characterized in that, The diameter of the sealing ball is smaller than the inner diameter of the pressure relief channel (1111).

7. The sealing cover according to claim 3, characterized in that, The plug (13) protrudes with a limiting post (131), and the first elastic member (122) abuts against the plug (13) and is sleeved around the periphery of the limiting post (131).

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