Anti-backflow self-closing check valve

Abstract

The utility model discloses a kind of backflow-preventing self-closing check valve, including valve body, the inlet and outlet are opened in the valve body, buffering cavity and installation cavity are arranged in the valve body, the inlet is communicated with the buffering cavity, the outlet is communicated with the installation cavity, the buffering cavity is connected with installation cavity by passageway mouth, further include pressing plate and filter screen bucket, the pressing plate is set in the installation cavity, the pressing plate is used to block the passageway mouth, the filter screen bucket is set in the buffering cavity, the volume of the filter screen bucket is less than the volume of buffering cavity, the bucket mouth of the filter screen bucket is towards the passageway mouth, the bucket bottom and part of lateral wall of the filter screen bucket are medium flow channel.This kind of check valve has following beneficial effects: by adopting the bucket bottom and part of lateral wall of filter screen bucket can be as the passageway of medium flow, can increase flowing area, reduce the probability that foreign matter in medium blocks filter screen bucket, improve the reliability when filtering.

Description

Technical Field

[0001] This utility model relates to the field of valves, and in particular to a backflow prevention self-closing check valve. Background Technology

[0002] Check valves are a commonly used type of valve. Patent publication CN203614756U discloses a type of check valve that uses a cylindrical filter to filter the flowing medium. However, this type of check valve with a cylindrical filter has a problem: because it filters impurities through the mesh openings on the cylindrical wall of the filter, and only the mesh openings at the outlet actually perform the filtering function, the actual filtering area of ​​the filter cylinder is very small. Therefore, this type of check valve has relatively poor reliability in actual use. Once the mesh openings at the outlet are blocked, the entire check valve will be completely blocked. Utility Model Content

[0003] To address the aforementioned problems, this utility model proposes a backflow-preventing self-closing check valve. By utilizing the bottom and part of the side wall of the filter screen barrel as channels for medium flow, the flow area can be increased, reducing the probability of foreign objects in the medium clogging the filter screen barrel, improving the reliability of filtration, and buffering all impurities at the positioning rod, making it convenient to remove the plug for drainage.

[0004] The technical solution adopted by this utility model is as follows:

[0005] A backflow-preventing self-closing check valve includes a valve body with an inlet and an outlet. The valve body contains a buffer chamber and an installation chamber. The inlet communicates with the buffer chamber, and the outlet communicates with the installation chamber. The buffer chamber and the installation chamber are connected via a channel opening. The valve body also includes a pressure plate and a filter screen barrel. The pressure plate is disposed within the installation chamber and is used to seal the channel opening. The filter screen barrel is disposed within the buffer chamber, and its volume is smaller than that of the buffer chamber. The opening of the filter screen barrel faces the channel opening, and the bottom and part of the sidewalls of the filter screen barrel serve as media flow channels.

[0006] In this type of backflow-preventing self-closing check valve, liquid (or gas) enters through the inlet. After entering the inlet, the liquid enters the buffer chamber, then passes through the filter screen barrel, and finally enters the installation chamber through the channel opening. After entering the installation chamber, it exits through the outlet. In the above process, the bottom (covered with mesh holes) and side walls (covered with mesh holes) of the filter screen barrel serve as channels for the medium to flow through. Utilizing the bottom and part of the side walls of the filter screen barrel as channels increases the flow area, thereby reducing the probability of foreign objects in the medium clogging the filter screen barrel and improving the reliability of filtration.

[0007] In summary, this type of self-closing check valve utilizes the bottom and part of the side wall of the filter screen barrel as a channel for the medium to flow through, which increases the flow area, reduces the probability of foreign objects in the medium clogging the filter screen barrel, and improves the reliability of filtration.

[0008] Optionally, a plug is provided at one end of the valve body, a sealing gasket is provided between the plug and the valve body, a positioning countersunk hole is provided on the plug, a positioning rod is provided at one end of the filter screen barrel, the positioning rod cooperates with the positioning countersunk hole, the bottom of the filter screen barrel does not contact the plug, and the positioning rod is perpendicular to the bottom of the filter screen barrel.

[0009] In this type of check valve, the plug seals one end of the valve body, and one end of the positioning rod is embedded in the positioning countersunk hole. This positioning countersunk hole and positioning rod effectively position the filter screen barrel. When the medium flows through the filter screen barrel and impacts it, the positioning rod prevents the filter screen barrel from shaking, thus reducing the noise during operation of the entire check valve. Furthermore, all impurities in this type of check valve are buffered at the positioning rod, facilitating the removal of the plug for drainage.

[0010] Optionally, a spring is also included, with a valve cap provided at one end of the valve body, one end of the spring abutting against the valve cap, the other end of the spring abutting against the pressure plate, and a sealing gasket provided between the valve cap and the valve body.

[0011] The valve cap and sealing gasket seal the other end of the valve body. The spring is located inside the mounting cavity, with one end pressing against the valve cap and the other against the pressure plate. The pressure plate seals the passage opening. When the pressure of the inlet medium on the pressure plate is less than the pressure of the spring on the pressure plate, the pressure plate seals the passage opening due to the spring's thrust. Therefore, this type of check valve relies on the spring pressure for sealing. When the pressure of the medium entering the valve body is less than a certain value, it achieves self-sealing under the spring pressure. When the pressure of the medium entering the valve body is higher than a certain value, the medium forces open the pressure plate, thus opening the check valve. Furthermore, the presence of the spring effectively prevents the medium at the outlet from flowing back to the inlet.

[0012] Optionally, the valve cap is provided with a limiting slide hole, and the pressure plate is provided with a limiting rod, the limiting rod and the limiting slide hole being slidably engaged together.

[0013] The limit rod is slidably set in the limit sliding hole. The existence of the limit rod and the limit sliding hole can ensure that the pressure plate will not be obstructed when moving up and down.

[0014] Optionally, the pressure plate is provided with a protrusion, the protrusion and the limiting rod are respectively located on both sides of the pressure plate, and a sealing gasket is fitted on the protrusion, the diameter of the protrusion being smaller than the diameter of the channel opening.

[0015] The sealing gasket is fitted onto the protrusion, and the diameter of the protrusion is smaller than the diameter of the channel opening. Therefore, even after the sealing gasket is removed, the pressure plate can still block the channel opening. When there is no sealing gasket to seal the channel opening, it is a hard seal. When the sealing gasket is fitted, the channel opening is blocked by the sealing gasket, which is a flexible seal.

[0016] The beneficial effects of this utility model are: by using the bottom and part of the side wall of the filter screen barrel as a channel for the medium to flow through, the flow area can be increased, the probability of foreign objects in the medium clogging the filter screen barrel can be reduced, the reliability of filtration can be improved, and all impurities are buffered at the positioning rod, making it convenient to remove the plug for sewage discharge. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a backflow-preventing self-closing check valve.

[0019] The labels in the attached figures are as follows: 1. Plug cap; 101. Positioning countersunk hole; 2. Sealing gasket; 3. Valve body; 301. Buffer chamber; 302. Inlet; 303. Channel port; 304. Mounting chamber; 305. Outlet; 4. Filter screen barrel; 5. Sealing flat gasket; 6. Pressure plate; 601. Limiting rod; 602. Protrusion; 7. Valve cap; 8. Spring; 9. Positioning rod. Detailed Implementation

[0020] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0023] As attached Figure 1 As shown, a backflow-preventing self-closing check valve includes a valve body 3 with an inlet 302 and an outlet 305. The valve body 3 contains a buffer chamber 301 and an installation chamber 304. The inlet 302 is connected to the buffer chamber 301, and the outlet 305 is connected to the installation chamber 304. The buffer chamber 301 and the installation chamber 304 are connected via a channel opening 303. The valve also includes a pressure plate 6 and a filter screen barrel 4. The pressure plate 6 is located within the installation chamber 304 and is used to block the channel opening 303. The filter screen barrel 4 is located within the buffer chamber 301, and its volume is smaller than that of the buffer chamber 301. The opening of the filter screen barrel 4 faces the channel opening 303, and the bottom and part of the sidewalls of the filter screen barrel 4 serve as media flow channels.

[0024] In this type of backflow-preventing self-closing check valve, liquid (or gas) enters through inlet 302. After entering inlet 302, the liquid enters buffer chamber 301, then passes through filter screen barrel 4, and then through channel port 303 into installation chamber 304. After entering installation chamber 304, it exits through outlet 305. In the above process, the bottom (covered with mesh holes) and side walls (covered with mesh holes) of filter screen barrel 4 serve as channels for the medium to flow through. Utilizing the bottom and side walls of filter screen barrel 4 as channels for the medium to flow through increases the flow area, thus reducing the probability of foreign objects in the medium clogging the filter screen barrel 4 and improving the reliability of filtration.

[0025] In summary, this type of self-closing check valve utilizes the bottom and part of the side wall of the filter screen 4 as a channel for the medium to flow through, which increases the flow area, reduces the probability of foreign objects in the medium clogging the filter screen 4, and improves the reliability of filtration.

[0026] As attached Figure 1 As shown, a plug cap 1 is provided at one end of the valve body 3, and a sealing gasket 2 is provided between the plug cap 1 and the valve body 3. A positioning countersunk hole 101 is provided on the plug cap 1. A positioning rod 9 is provided at one end of the filter screen barrel 4. The positioning rod 9 is engaged with the positioning countersunk hole 101. The bottom of the filter screen barrel 4 does not contact the plug cap 1, and the positioning rod 9 is perpendicular to the bottom of the filter screen barrel 4.

[0027] In this type of check valve, the plug cap 1 is used to seal one end of the valve body 3, and one end of the positioning rod 9 is embedded in the positioning countersunk hole 101. In this way, the positioning countersunk hole 101 and the positioning rod 9 are used to position and install the filter screen barrel 4. When the medium flows through the filter screen barrel 4 and impacts it, the presence of the positioning rod 9 can prevent the filter screen barrel 4 from shaking, thereby reducing the noise of the entire check valve during operation.

[0028] As attached Figure 1 As shown, it also includes a spring 8, a valve cap 7 is provided at one end of the valve body 3, one end of the spring 8 abuts against the valve cap 7, the other end of the spring 8 abuts against the pressure plate 6, and a sealing gasket 2 is provided between the valve cap 7 and the valve body 3.

[0029] The valve cap 7 and sealing gasket 2 seal the other end of the valve body 3. Spring 8 is located in the mounting cavity 304, with one end abutting against the valve cap 7 and the other end against the pressure plate 6. Pressure plate 6 seals the passage opening 303. When the pressure of the medium flowing into inlet 302 on pressure plate 6 is less than the pressure of spring 8 on pressure plate 6, pressure plate 6 seals the passage opening 303 due to the spring's thrust. Therefore, this type of check valve relies on the pressure of spring 8 for sealing. When the pressure of the medium entering valve body 3 is less than a certain value, self-sealing is achieved under the pressure of spring 8. When the pressure of the medium entering valve body 3 is higher than a certain value, the medium pushes open pressure plate 6, thereby opening the check valve. Furthermore, the presence of spring 8 effectively prevents the medium at outlet 305 from flowing back to inlet 302.

[0030] As attached Figure 1 As shown, the valve cap 7 is provided with a limit sliding hole, and the pressure plate 6 is provided with a limit rod 601. The limit rod 601 and the limit sliding hole are slidably engaged together.

[0031] The limiting rod 601 is slidably disposed in the limiting slide hole. The presence of the limiting rod 601 and the limiting slide hole can ensure that the pressure plate 6 will not be obstructed when moving up and down.

[0032] As attached Figure 1As shown, a protrusion 602 is provided on the pressure plate 6. The protrusion 602 and the limiting rod 601 are located on both sides of the pressure plate 6, respectively. A sealing gasket 5 is fitted on the protrusion 602. The diameter of the protrusion 602 is smaller than the diameter of the channel opening 303.

[0033] The sealing gasket 5 is fitted onto the protrusion 602, and the diameter of the protrusion 602 is smaller than the diameter of the channel opening 303. Therefore, even after removing the sealing gasket 5, the pressure plate 6 can still seal the channel opening 303. When the sealing gasket 5 is not used to seal the channel opening 303, it is a hard seal. When the sealing gasket 5 is fitted onto the channel opening 303, it is a flexible seal.

[0034] The above-described embodiments only illustrate some aspects of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A backflow-preventing self-closing check valve, comprising a valve body, an inlet and an outlet on the valve body, a buffer chamber and a mounting chamber disposed within the valve body, the inlet communicating with the buffer chamber, the outlet communicating with the mounting chamber, and the buffer chamber and the mounting chamber being connected via a channel, characterized in that, It also includes a pressure plate and a filter screen barrel. The pressure plate is disposed in the mounting cavity and is used to block the channel opening. The filter screen barrel is disposed in the buffer cavity. The volume of the filter screen barrel is smaller than the volume of the buffer cavity. The opening of the filter screen barrel faces the channel opening. The bottom and part of the side wall of the filter screen barrel are media flow channels.

2. The backflow prevention self-closing check valve according to claim 1, characterized in that, A plug is provided at one end of the valve body, and a sealing gasket is provided between the plug and the valve body. A positioning countersunk hole is provided on the plug. A positioning rod is provided at one end of the filter screen barrel. The positioning rod cooperates with the positioning countersunk hole. The bottom of the filter screen barrel does not contact the plug. The positioning rod is perpendicular to the bottom of the filter screen barrel.

3. The backflow prevention self-closing check valve according to claim 1, characterized in that, It also includes a spring, a valve cap is provided at one end of the valve body, one end of the spring abuts against the valve cap, the other end of the spring abuts against the pressure plate, and a sealing gasket is provided between the valve cap and the valve body.

4. A backflow prevention self-closing check valve according to claim 3, characterized in that, The valve cap is provided with a limiting slide hole, and the pressure plate is provided with a limiting rod, which slides together with the limiting slide hole.

5. A backflow prevention self-closing check valve according to claim 4, characterized in that, The pressure plate is provided with a protrusion, which and the limiting rod are located on the two sides of the pressure plate respectively. A sealing gasket is fitted on the protrusion, and the diameter of the protrusion is smaller than the diameter of the channel opening.

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