Corrosion-resistant check valve

Abstract

The utility model provides a corrosion-resistant check valve which comprises a valve body, the inner side and the outer side of the valve body are respectively coated with a first corrosion-resistant layer, the inner wall of the valve body is fixedly connected with an annular boss, the annular boss is located at the position in the direction of one end of the valve body, and the annular boss is fixedly connected with a second corrosion-resistant layer. A plurality of first mounting holes are formed in the side, close to the other end of the valve body, of the annular boss, a sealing base plate is fixedly connected to the annular boss, and the first mounting holes are evenly distributed at equal angles relative to the central axis of the annular boss. The corrosion-resistant check valve can be applied to a pipeline suitable for corrosive fluid, the corrosion resistance of the check valve is improved through a first corrosion-resistant layer, a second corrosion-resistant layer and a third corrosion-resistant layer, pressure borne by the movable part is buffered through a first connecting block, a first spring and a second connecting block, and the movable part is prevented from being damaged. The movable part and the valve clack are prevented from vibrating, abrasion caused by vibration generated by self-reaction of the check valve is avoided, and the service life of the check valve is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a corrosion-resistant check valve. Background Art

[0002] A check valve is an automatic valve mainly used to prevent fluid backflow. The working principle of the check valve is relatively simple. When the fluid flows in the specified direction, the check valve can be smoothly opened to allow the fluid to pass through; while when the fluid attempts to flow in the reverse direction, the check valve will automatically close to prevent the fluid from flowing back. The check valve is widely used in many fields. There are various types of check valves, such as lift check valves, swing check valves, etc.

[0003] Check valves are usually installed in various pipelines that require unidirectional fluid flow. In some pipelines carrying fluids with certain corrosiveness, it is often necessary to install check valves on the pipelines. When existing check valves are used in such pipelines, they are easily corroded by the medium, affecting the service life of the check valve. In addition, under the action of elastic force and fluid impact force, the valve flap will cause vibration to the check valve, bringing wear to the check valve, which is not conducive to the use of the check valve and affects the service life of the check valve. To solve the above problems, we propose a corrosion-resistant check valve. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a corrosion-resistant check valve, which can be applied to pipelines for corrosive fluids. The first corrosion-resistant layer, the second corrosion-resistant layer and the third corrosion-resistant layer increase the corrosion resistance of the check valve. The first connecting block, the first spring and the second connecting block buffer the pressure received by the moving part, avoiding vibration of the moving part and the valve flap, and avoiding wear caused by vibration generated by the check valve itself, greatly increasing the service life of the check valve.

[0005] The embodiments of the utility model are implemented as follows:

[0006] The embodiments of the utility model provide a corrosion-resistant check valve, including a valve body. The inner and outer sides of the valve body are both coated with a first corrosion-resistant layer. An annular boss is fixedly connected to the inner wall of the valve body. The annular boss is located at one end direction of the valve body. A plurality of first mounting holes are formed in one side of the annular boss close to the other end of the valve body, and a sealing gasket is fixedly connected. The plurality of first mounting holes are evenly distributed at equal angles about the central axis of the annular boss. One end of the sealing gasket away from the annular boss is connected with a moving part. A plurality of through holes are formed in one end of the sealing gasket. A plurality of second mounting holes are formed in one end of the moving part close to the sealing gasket. Two ends of the plurality of through holes respectively correspond to and communicate with the plurality of first mounting holes and the plurality of second mounting holes one by one.

[0007] Optionally, a first connecting block is connected to the inner bottom wall of the first mounting hole. One end of the first connecting block away from the inner bottom wall of the first mounting hole is fixedly connected to a first spring. The other end of the first spring is fixedly connected to a second connecting block. The second connecting block is located inside the second mounting hole. The first spring is located inside the first mounting hole, the through hole, and the second mounting hole. A second corrosion-resistant layer is coated on the surface of the first spring.

[0008] Optionally, a bolt is threadedly connected to the inner bottom wall of the first mounting hole. One end of the bolt penetrates through the first connecting block, the second connecting block, and the inner bottom wall of the second mounting hole. The bolt is located inside the first spring.

[0009] Optionally, four supporting members are fixedly connected to the other end of the valve body. One end of the four supporting members away from the valve body is commonly fixedly connected to a fixing sleeve. The supporting members are evenly distributed at equal angles with respect to the central axis of the fixing sleeve. A second fixing member is fixedly connected to the inner wall of the fixing sleeve.

[0010] Optionally, one end of the second fixing member is fixedly connected to a second spring. The other end of the second spring is fixedly connected to a first fixing member. One end of the first fixing member away from the second spring is fixedly connected to a valve flap. The other end of the valve flap is in contact with the other end of the movable member.

[0011] Optionally, one end of the first fixing member away from the valve flap is fixedly connected to a valve rod. The valve rod is slidably connected to the second fixing member. The valve rod is located inside the second spring. A third corrosion-resistant layer is coated on the surface of the second spring.

[0012] Optionally, flange plates are fixedly connected to both ends of the valve body.

[0013] The beneficial effects of the embodiments of the present utility model include: The embodiments of the present utility model provide a corrosion-resistant check valve. The corrosion resistance of the inside and outside of the valve body is increased by the first corrosion-resistant layer. The first spring is protected against corrosion by the second corrosion-resistant layer, and the second spring is protected against corrosion by the third corrosion-resistant layer, increasing the service life of the first spring and the second spring. When the fluid pressure is greater than the elastic force of the second spring, the fluid pushes the valve flap to move towards the second fixing member, separating the valve flap from the movable member. The fluid enters the valve body and flows out from the other end of the valve body. At the same time, the first spring drives the second connecting block to move away from the first connecting block, and the second connecting block drives the movable member to move. After the movable member contacts the screw head of the bolt, the movable member stops moving. When the fluid pressure is less than the elastic force of the second spring, under the action of the second fixing member, the second spring drives the first fixing member and the valve flap to move towards the movable member. Then, the valve flap squeezes the movable member, and the movable member drives the second connecting block to move. The second connecting block squeezes the first spring. At the same time, the first spring buffers the pressure received by the movable member, preventing the movable member from vibrating and damaging the check valve. The movable member continues to move closer to the sealing gasket until the movable member is in close contact with the sealing gasket and then stops moving, and the check valve is closed. It can be applied to pipelines for corrosive fluids. The first corrosion-resistant layer, the second corrosion-resistant layer, and the third corrosion-resistant layer increase the corrosion resistance of the check valve. The first connecting block, the first spring, and the second connecting block buffer the pressure received by the movable member, preventing the movable member and the valve flap from vibrating and avoiding wear caused by the vibration generated by the check valve itself, greatly increasing the service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 is a three-dimensional Figure 1 schematic diagram of a corrosion-resistant check valve of the present utility model;

[0016] Figure 2 is a three-dimensional Figure 2 schematic diagram of a corrosion-resistant check valve of the present utility model;

[0017] Figure 3 is a cross-sectional schematic diagram of a corrosion-resistant check valve of the present utility model;

[0018] Figure 4 is a Figure 3Enlarged schematic diagram at position A in [Chinese name of the device];

[0019] Figure 5 Schematic diagram of the moving part of a corrosion-resistant check valve of the present utility model.

[0020] Icon: 1. Valve body; 11. Support member; 100. First corrosion-resistant layer; 101. Second corrosion-resistant layer; 102. Third corrosion-resistant layer; 111. Fixed sleeve; 12. Flange; 2. Annular boss; 21. First mounting hole; 31. First connecting block; 32. First spring; 33. Second connecting block; 34. Bolt; 4. Sealing gasket; 41. Through hole; 5. Moving part; 51. Second mounting hole; 6. Valve flap; 61. First fixing member; 62. Valve stem; 63. Second fixing member; 64. Second spring. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0022] 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", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use. 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 therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0023] In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0024] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. 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.

[0025] As Figures 1-5 shown, an embodiment of the present utility model provides a corrosion-resistant check valve, including a valve body 1. Both the inner and outer sides of the valve body 1 are coated with a first corrosion-resistant layer 100. An annular boss 2 is fixedly connected to the inner wall of the valve body 1. The annular boss 2 is located at one end direction of the valve body 1. A plurality of first mounting holes 21 are formed in one side of the annular boss 2 close to the other end of the valve body 1, and a sealing gasket 4 is fixedly connected. The plurality of first mounting holes 21 are evenly distributed at equal angles with respect to the central axis of the annular boss 2. One end of the sealing gasket 4 away from the annular boss 2 is connected to a movable member 5. A plurality of through holes 41 are formed in one end of the sealing gasket 4. A plurality of second mounting holes 51 are formed in one end of the movable member 5 close to the sealing gasket 4. Both ends of the plurality of through holes 41 respectively correspond to and communicate with the plurality of first mounting holes 21 and the plurality of second mounting holes 51 one by one.

[0026] As Figure 3 and Figure 4 shown, the first corrosion-resistant layer 100 is made of polytetrafluoroethylene material. The inner and outer sides of the valve body 1 are subjected to corrosion-resistant treatment through the first corrosion-resistant layer 100, so that the corrosion-resistant performance of the check valve is improved.

[0027] In this embodiment, as Figure 3 and Figure 4 shown, a first connecting block 31 is connected to the inner bottom wall of the first mounting hole 21. One end of the first connecting block 31 away from the inner bottom wall of the first mounting hole 21 is fixedly connected to a first spring 32. The other end of the first spring 32 is fixedly connected to a second connecting block 33. The second connecting block 33 is located inside the second mounting hole 51. The first spring 32 is located in the first mounting hole 21, the through hole 41, and the second mounting hole 51. A second corrosion-resistant layer 101 is coated on the surface of the first spring 32.

[0028] A bolt 34 is threadedly connected to the inner bottom wall of the first mounting hole 21. One end of the bolt 34 penetrates through the first connecting block 31, the second connecting block 33, and the inner bottom wall of the second mounting hole 51. The bolt 34 is located inside the first spring 32.

[0029] As Figure 3 and Figure 4As shown, the No. 1 spring 32 is used to buffer the external force exerted on the movable part 5, reduce the vibration generated when the movable part 5 is subjected to the external force, and reduce the damage to the check valve caused by the vibration. The movable part 5 is limited and guided by the bolt 34. The No. 2 corrosion-resistant layer 101 is made of polytetrafluoroethylene material. The No. 1 corrosion-resistant layer 101 is used to provide corrosion-resistant protection for the No. 1 spring 32 to ensure the effectiveness of the No. 1 spring 32.

[0030] In this embodiment, Figure 3 As shown, four support members 11 are fixedly connected to the other end of the valve body 1, and a fixing sleeve 111 is commonly fixedly connected to one end of the four support members 11 away from the valve body 1. The support members 11 are evenly distributed at equal angles about the central axis of the fixing sleeve 111, and a No. 2 fixing member 63 is fixedly connected to the inner wall of the fixing sleeve 111.

[0031] As shown in FIG3 , the fixing sleeve 111 is supported by the support member 11 , and the fixing sleeve 111 is used to fix the second fixing member 63 . The second fixing member 63 is used to resist the second spring 64 and the guide of the valve stem 62 .

[0032] In this embodiment, Figure 3 As shown, flanges 12 are fixedly connected to both ends of the valve body 1.

[0033] like Figure 3 As shown, the check valve is connected to the corresponding pipeline via two flanges 12 .

[0034] In this embodiment, Figure 3 As shown, one end of the No. 2 fixing member 63 is fixedly connected to the No. 2 spring 64, the other end of the No. 2 spring 64 is fixedly connected to the No. 1 fixing member 61, the end of the No. 1 fixing member 61 away from the No. 2 spring 64 is fixedly connected to the valve flap 6, and the other end of the valve flap 6 is in contact with the other end of the movable member 5.

[0035] Optionally, the end of the No. 1 fixing member 61 away from the valve disc 6 is fixedly connected to the valve stem 62, and the valve stem 62 is slidably connected to the No. 2 fixing member 63. The valve stem 62 is located in the No. 2 spring 64, and the surface of the No. 2 spring 64 is coated with a No. 3 corrosion-resistant layer 102.

[0036] like Figure 3 As shown, the valve flap 6 and the movable part 5 are pushed to fit tightly together by the No. 1 fixing part 61, the valve stem 62, the No. 2 fixing part 63 and the No. 2 spring 64. The valve flap 6 squeezes the movable part 5 to close the check valve and prevent backflow. The No. 3 corrosion-resistant layer 102 is made of polytetrafluoroethylene material, which provides corrosion-resistant protection for the No. 2 spring 64 to ensure the effectiveness of the No. 2 spring 64.

[0037] It should be noted that the present utility model is a corrosion-resistant check valve. The corrosion resistance of the inside and outside of the valve body 1 is increased through the first corrosion-resistant layer 100. The first spring 32 is protected against corrosion through the second corrosion-resistant layer 101, and the second spring 64 is protected against corrosion through the third corrosion-resistant layer 102, thereby increasing the service life of the first spring 32 and the second spring 64. When the fluid pressure is greater than the elastic force of the second spring 64, the fluid pushes the valve flap 6 to move towards the second fixing member 63, separating the valve flap 6 from the movable member 5. The fluid enters the valve body 1 and flows out from the other end of the valve body 1. At the same time, the first spring 32 drives the second connecting block 33 to move in a direction away from the first connecting block 31, and the second connecting block 33 drives the movable member 5 to move. When the movable member 5 contacts the screw head of the bolt 34, the movable member 5 stops moving. When the fluid pressure is less than the elastic force of the second spring 64, under the action of the second fixing member 63, the second spring 64 drives the first fixing member 61 and the valve flap 6 to move towards the movable member 5. Then, the valve flap 6 squeezes the movable member 5, and the movable member 5 drives the second connecting block 33 to move. The second connecting block 33 squeezes the first spring 32. At the same time, the first spring 32 buffers the pressure received by the movable member 5 to avoid vibration of the movable member 5 and damage to the check valve. The movable member 5 continues to move closer to the sealing gasket 4 until the movable member 5 is in close contact with the sealing gasket 4 and then the movable member 5 stops moving, and the check valve is closed.

[0038] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, various changes and modifications can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A corrosion-resistant check valve, comprising a valve body (1), characterized in that: Both the inner and outer sides of the valve body (1) are coated with a No. 1 corrosion-resistant layer (100); an annular boss (2) is fixedly connected to the inner wall of the valve body (1); the annular boss (2) is located at one end of the valve body (1); a plurality of No. 1 mounting holes (21) and a sealing gasket (4) are fixedly connected on one side of the annular boss (2) close to the other end of the valve body (1); the plurality of No. 1 mounting holes (21) are evenly distributed at equal angles with respect to the central axis of the annular boss (2); a movable part (5) is connected to one end of the sealing gasket (4) away from the annular boss (2); a plurality of through holes (41) are opened at one end of the sealing gasket (4); a plurality of No. 2 mounting holes (51) are opened at one end of the movable part (5) close to the end of the sealing gasket (4); and the two ends of the plurality of through holes (41) correspond one-to-one to and are connected to the plurality of No. 1 mounting holes (21) and the plurality of No. 2 mounting holes (51).

2. A corrosion-resistant check valve according to claim 1, characterized in that: A No. 1 connecting block (31) is connected to the inner bottom wall of the No. 1 mounting hole (21); one end of the No. 1 connecting block (31) away from the inner bottom wall of the No. 1 mounting hole (21) is fixedly connected to a No. 1 spring (32); the other end of the No. 1 spring (32) is fixedly connected to a No. 2 connecting block (33); the No. 2 connecting block (33) is located inside the No. 2 mounting hole (51); the No. 1 spring (32) is located inside the No. 1 mounting hole (21), the through hole (41) and the No. 2 mounting hole (51); and a No. 2 corrosion-resistant layer (101) is coated on the surface of the No. 1 spring (32).

3. A corrosion-resistant check valve according to claim 2, characterized in that: A bolt (34) is threadedly connected to the inner bottom wall of the No. 1 mounting hole (21), one end of the bolt (34) passes through the No. 1 connecting block (31), the No. 2 connecting block (33) and the inner bottom wall of the No. 2 mounting hole (51), and the bolt (34) is located in the No. 1 spring (32).

4. A corrosion-resistant check valve according to claim 3, characterized in that: The other end of the valve body (1) is fixedly connected to four support members (11), and one end of the four support members (11) away from the valve body (1) is commonly fixedly connected to a fixing sleeve (111), the support members (11) are evenly distributed at equal angles with respect to the central axis of the fixing sleeve (111), and a second fixing member (63) is fixedly connected to the inner wall of the fixing sleeve (111).

5. A corrosion-resistant check valve according to claim 4, characterized in that: One end of the No. 2 fixing member (63) is fixedly connected to a No. 2 spring (64), the other end of the No. 2 spring (64) is fixedly connected to a No. 1 fixing member (61), one end of the No. 1 fixing member (61) away from the No. 2 spring (64) is fixedly connected to a valve flap (6), and the other end of the valve flap (6) is in contact with the other end of the movable member (5).

6. A corrosion-resistant check valve according to claim 5, characterized in that: The end of the No. 1 fixing member (61) away from the valve flap (6) is fixedly connected with a valve stem (62), and the valve stem (62) is slidably connected to the No. 2 fixing member (63). The valve stem (62) is located in the No. 2 spring (64), and the surface of the No. 2 spring (64) is coated with a No. 3 corrosion-resistant layer (102).

7. The corrosion-resistant check valve according to claim 1, characterized in that: Both ends of the valve body (1) are fixedly connected with flanges (12).

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