A reverse flow prevention control device

Abstract

This application relates to an anti-backflow control device, comprising: a valve body with a through channel inside; a valve seat fixed to one end of the valve body and having its inner cavity connected to the internal channel of the valve body, wherein one end of the inner cavity of the valve seat is formed with a valve port; a valve sleeve disposed inside the valve body and coaxially fixedly connected to the valve body, wherein a fixed sleeve is provided at the center of the valve sleeve and extends away from the valve port; a guide sleeve, one end of which is fixed inside the fixed sleeve and the other end of which extends towards the valve port; a guide sleeve, one end of which is fixed inside the fixed sleeve and the other end of which extends towards the valve port; and a valve core assembly that slides with the guide sleeve, wherein the valve core assembly is configured to cooperate with the valve port. This invention enables the valve sleeve to be coaxially connected to the valve body, and the fixed sleeve guides the movement of the valve core assembly, thereby avoiding valve core jamming and leakage during valve closure due to concentricity differences, which improves the valve's response flexibility and extends its service life.

Description

Technical Field

[0001] This application relates to the field of fluid control technology, and in particular to an anti-backflow control device. Background Technology

[0002] In the field of fluid control, valves are essential control components used to regulate, open, or close fluid passages, and are widely used in hydraulic, pneumatic, petrochemical, water treatment, air conditioning, and automation systems. Based on their structure and function, valves can be classified into various types, including gate valves, ball valves, check valves, and pressure reducing valves. Among these, check valves (also known as one-way valves) are devices that automatically prevent backflow of media and are widely used in air conditioning systems. They automatically open and close under fluid pressure through a valve core, thus achieving unidirectional flow and reverse blocking. With their simple structure and rapid response, they are an indispensable component in various fluid pipelines.

[0003] However, existing check valves still have certain shortcomings in terms of structural design and manufacturing process. Most existing valve sleeves and valve bodies are fixedly connected by welding. During the welding process, uneven heat input or stress concentration can easily lead to deformation of the valve sleeve, causing misalignment between the inner bore of the valve sleeve and the central axis of the valve body. When the valve core slides axially within the valve sleeve, the difference in coaxiality can cause jamming or uneven wear, resulting in insensitive opening and closing, reduced sealing performance, and even media leakage. Furthermore, in existing check valves, the valve core is prone to excessively rapid opening speed due to fluid impact at the moment of opening, causing a violent collision between the valve core and the valve sleeve end face. This generates noise and may damage the valve core or valve sleeve, affecting the valve's service life and stability. Utility Model Content

[0004] In order to solve the problems mentioned in the background art, such as poor coaxiality of valve core due to deformation of valve sleeve, which affects sensitivity and sealing performance, and excessive noise and short service life of parts due to direct impact between valve core and valve sleeve during valve opening due to excessive speed, this application provides an anti-backflow control device.

[0005] The anti-backflow control device provided in this application adopts the following technical solution:

[0006] A backflow prevention control device, comprising:

[0007] The valve body has a through channel inside;

[0008] A valve seat is fixed to one end of the valve body and its inner cavity is connected to the internal channel of the valve body. A valve port is formed at one end of the inner cavity of the valve seat.

[0009] A valve sleeve is located inside the valve body and is fixedly connected to the valve body coaxially. A fixed sleeve is provided at the center of the valve sleeve, and the fixed sleeve extends away from the valve port.

[0010] The guide sleeve has one end fixed inside the fixed sleeve and the other end extending towards the valve port.

[0011] A valve core assembly is slidably fitted with a guide sleeve. The valve core assembly is configured to fit with a valve port. When the valve core assembly fits with the valve port, the valve core assembly isolates the internal channel of the valve body. When the valve core assembly separates from the valve port, the internal channel of the valve body is connected.

[0012] The above technical solution enables the valve sleeve to be coaxially connected to the valve body, and the fixed sleeve can guide the movement of the valve core assembly, so as to avoid valve core jamming and leakage when closing the valve due to concentricity difference. This helps to improve the response flexibility of the valve and extend its service life.

[0013] Optionally, the valve sleeve is an integrally stamped or machined through-end sleeve structure.

[0014] Through the above technical solution, firstly, different processing methods can be selected to form the valve sleeve according to actual needs, so as to adapt to the needs of actual processing conditions. Secondly, the valve sleeve has a through-hole structure at both ends, which can prevent the guide shaft from being obstructed due to excessive local pressure when sliding in the guide sleeve, thus ensuring the normal operation of the valve core assembly.

[0015] Optionally, a liquid passage hole is provided at the end of the valve sleeve, and there are several liquid passage holes evenly distributed around the center of the valve sleeve.

[0016] The above technical solution enables fluid to flow from the valve port into the valve sleeve when the valve is opened, and to continue flowing outward along the liquid passage, thus achieving normal fluid flow.

[0017] Optionally, the valve core assembly includes a guide shaft that is at least partially placed inside a fixed sleeve and slidably engaged with the fixed sleeve, and the valve core is connected to one end of the guide shaft near the valve port.

[0018] The above technical solution enables the valve core and guide shaft to move as a whole inside the valve body, and the sliding fit between the guide shaft and the guide sleeve provides a stable guiding effect for the movement of the valve core, so that the valve core always reciprocates along the central axis, thereby improving the reliability during operation.

[0019] Optionally, a pressure relief hole is provided at the center of the end of the fixed sleeve, and the pressure relief hole is connected to the inner cavity of the guide sleeve.

[0020] The above technical solution allows fluid to flow out from the pressure relief hole when the guide shaft moves, thus avoiding excessive resistance.

[0021] Optionally, the end of the guide sleeve near the valve port is folded outward to form a pleated edge, the outer end face of the pleated edge is a plane perpendicular to the center line of the guide sleeve, and the outer end face of the pleated edge can abut against the end face of the valve core.

[0022] The above technical solution enables the valve core to contact the outer end face of the pleated edge after the valve is opened and when it moves to the limit position, thus achieving a reliable and stable axial limiting effect.

[0023] Optionally, a limiting structure is provided between the valve sleeve and the valve body for axially limiting the valve sleeve within the valve body.

[0024] Optionally, the limiting structure includes a first stepped portion formed on the inner wall of the valve body and extending towards its center, and a second stepped portion formed on the outer wall of the valve sleeve and extending radially outward therefrom, wherein the end face of the first stepped portion and the end face of the second stepped portion are in contact; or

[0025] The limiting structure includes a third stepped portion formed at the tail of the valve body and extending towards its center, the end of the valve sleeve abutting against the end face of the third stepped portion; or

[0026] The limiting structure includes a constricted section formed at the tail of the valve body, with one end of the valve sleeve abutting against the inner wall of the constricted section and the other end abutting against the end of the valve seat.

[0027] The above technical solution enables the valve sleeve to be quickly installed inside the valve body during assembly. The valve sleeve is fixed by a tight fit or by abutting at both ends, replacing the traditional welding method and preventing deformation of the valve sleeve.

[0028] Optionally, the valve seat is located inside the valve body or one end of the valve seat extends to the outside of the valve body, and a welding groove is formed between the valve seat and the valve body.

[0029] The above technical solutions allow for different installation methods to connect the valve seat and valve body to meet actual working requirements.

[0030] Optionally, it also includes a spring, which is partially placed inside the guide sleeve, with one end extending to the outside of the guide sleeve and located in the gap formed between the guide sleeve and the fixed sleeve, and the other end extending toward the guide shaft and able to contact the guide shaft during operation.

[0031] By adopting the above technical solution, when the valve core opens during valve operation, the guide shaft slides a certain distance in the guide sleeve before contacting the spring and reducing the movement speed of the valve core through the spring, thus avoiding the problem of collision between the valve core and the valve sleeve. On the one hand, this can reduce noise, and on the other hand, it can prevent damage to components due to collision.

[0032] In summary, this application includes at least one of the following beneficial technical effects:

[0033] This invention connects the valve sleeve coaxially to the valve body and guides the movement of the valve core assembly through the fixing sleeve, thereby avoiding valve core jamming and leakage when closing the valve due to concentricity difference. This helps to improve the valve's response flexibility and extend its service life.

[0034] This invention allows the guide shaft to slide a certain distance within the guide sleeve before contacting the spring during valve operation. The spring then reduces the movement speed of the valve core, preventing collisions between the valve core and the valve sleeve. This not only reduces noise but also prevents damage to components caused by impacts. Attached Figure Description

[0035] Figure 1 This is a structural diagram of Embodiment 1 of the present utility model;

[0036] Figure 2 This is a structural diagram of the valve sleeve according to Embodiment 1 of this utility model;

[0037] Figure 3 This is a structural diagram of Embodiment 2 of the present invention;

[0038] Figure 4 This is a structural diagram of the valve sleeve in Embodiment 2 of this utility model;

[0039] Figure 5 This is a structural diagram of Embodiment 3 of this utility model;

[0040] Figure 6 This is a structural diagram of the valve sleeve in Embodiment 3 of this utility model;

[0041] Figure 7 This is a structural diagram of Embodiment 4 of this utility model;

[0042] Figure 8 This is a structural diagram of the valve sleeve in Embodiment 4 of this utility model;

[0043] Figure 9 This is a structural diagram of Embodiment 5 of this utility model;

[0044] Figure 10 This is a structural diagram of Embodiment Six of this utility model;

[0045] Figure 11 This is a structural diagram of Embodiment Seven of this utility model.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Valve body; 101. First step section; 102. Third step section; 103. Narrowing section;

[0048] 2. Valve sleeve; 201. Fluid passage hole; 202. Fixing sleeve; 203. Pressure relief hole; 204. Second step section;

[0049] 3. Valve core;

[0050] 4. Valve seat; 401. Valve port; 402. Welding groove;

[0051] 5. Guide shaft;

[0052] 6. Guide sleeve; 601. Ruffled edge;

[0053] 7. Spring. Detailed Implementation

[0054] The present application will be further described in detail below with reference to the accompanying drawings.

[0055] Example 1

[0056] like Figure 1-2 As shown, this embodiment discloses an anti-backflow control device, comprising:

[0057] Valve body 1 has a through channel inside;

[0058] Valve seat 4 is fixed to one end of valve body 1 and its inner cavity is connected to the internal channel of valve body 1. One end of the inner cavity of valve seat 4 is formed with valve port 401.

[0059] Valve sleeve 2 is located inside valve body 1 and is coaxially fixedly connected to valve body 1. A fixed sleeve 202 is provided at the center of valve sleeve 2. The fixed sleeve 202 extends away from valve port 401. The end of valve sleeve 2 near valve port 401 is open, and the fixed sleeve 202 is provided at the center of the end away from valve port 401. The fixed sleeve 202 is integrally connected to valve sleeve 2. The fixed sleeve 202 is located away from valve port 401 and continues to extend outward. This is mainly to avoid the fixed sleeve 202 being close to valve port 401 and thus restricting the opening and closing space of valve core 3. Sufficient space is reserved to facilitate the movement of valve core assembly. While improving the response flexibility of valve core 3, it can also form sufficient space between valve core 3 and valve port 401 after valve opening to facilitate fluid passage and improve fluid passage performance. In addition, after guide sleeve 6 is placed inside the fixed sleeve 202, it can have a large contact area with guide sleeve 6, realize the stable assembly of guide sleeve 6, and improve the concentricity of guide sleeve 6.

[0060] The guide sleeve 6 has one end fixed inside the fixed sleeve 202 and the other end extending toward the valve port 401. The guide sleeve 6 can be fixed inside the fixed sleeve 202 by means of tight fit, welding or threaded connection.

[0061] The valve core assembly is slidably engaged with the guide sleeve 6. The valve core assembly is configured to engage with the valve port 401. When the valve core assembly is in contact with the valve port 401, the valve core assembly isolates the internal channel of the valve body 1. When the valve core assembly is separated from the valve port 401, the internal channel of the valve body 1 is connected.

[0062] Specifically, the valve sleeve 2 is an integrally stamped through-type sleeve structure with two ends. The stamping method has the advantages of fast forming speed and low cost, which can shorten the processing time.

[0063] Specifically, a liquid passage hole 201 is provided at the end of the valve sleeve 2. There are several liquid passage holes 201 and they are evenly distributed around the center of the valve sleeve 2. In this example, the liquid passage hole 201 is a fan-shaped hole.

[0064] Specifically, the valve core assembly includes a guide shaft 5 that is at least partially placed inside the fixed sleeve 202 and slidably engaged with the fixed sleeve 202, and the valve core 3 is connected to one end of the guide shaft 5 near the valve port 401.

[0065] Specifically, a pressure relief hole 203 is provided at the center of the end of the fixed sleeve 202. The pressure relief hole 203 is connected to the inner cavity of the guide sleeve 6. During operation, the fluid entering the guide sleeve 6 can flow outward under the push of the guide shaft 5 during the valve opening process of the valve core 3, so as to avoid the problem of the guide shaft 5 being obstructed due to the closed structure at the end of the fixed sleeve 202.

[0066] Specifically, the guide sleeve 6 has an outward fold at one end near the valve port 401 to form a pleated edge 601. The outer end face of the pleated edge 601 is a plane perpendicular to the center line of the guide sleeve 6. The outer end face of the pleated edge 601 can abut against the end face of the valve core 3. The pleated edge 601 is used to increase the contact area with the end face of the valve core 3 and provide a stable and reliable limiting effect.

[0067] Specifically, a limiting structure is provided between the valve sleeve 2 and the valve body 1 for axially limiting the valve sleeve 2 within the valve body 1.

[0068] Specifically, in this example, the limiting structure includes a first step portion 101 formed on the inner wall of the valve body 1 and extending towards its center, and a second step portion 204 formed on the outer wall of the valve sleeve 2 and extending towards its outer radial direction. The end face of the first step portion 101 and the end face of the second step portion 204 are in contact. During assembly, the valve sleeve 2 is inserted into the valve body 1, and the axial positioning of the valve sleeve 2 is achieved by the contact of the end faces of the two steps. Subsequently, the valve sleeve 2 can be fixed in the valve body 1 by a tight fit. The tight fit can be achieved by spinning, concave, interference fit, etc.

[0069] In this example, one end of the valve seat 4 extends to the outside of the valve body 1, and a welding groove 402 is formed between the valve seat 4 and the valve body 1. The welding ring can be placed in the welding groove 402, and the valve seat 4 and the valve body 1 can be welded and fixed by brazing or kiln heating.

[0070] Example 2

[0071] like Figure 3-4 As shown, the only difference between this embodiment and the first embodiment above is that in this example, the valve sleeve 2 is formed by turning, and the liquid passage hole 201 at its end is a round hole.

[0072] Example 3

[0073] like Figure 5-6 As shown, the difference between this embodiment and the first embodiment above is only that: in this example, the limiting structure includes a third step portion 102 formed at the tail position of the valve body 1 and extending towards its center. The end of the valve sleeve 2 abuts against the end face of the third step portion 102. Similarly, after the valve sleeve 2 is installed in the valve body 1 and its end abuts against the end of the third step portion 102, the valve sleeve 2 is then fixed in the valve body 1 by a spinning method.

[0074] Example 4

[0075] like Figure 7-8 As shown, the only difference between this embodiment and the above embodiment three is that in this example, the valve sleeve 2 is formed by turning, and the liquid passage hole 201 at its end is a round hole.

[0076] Example 5

[0077] like Figure 9 As shown, the difference between this embodiment and the first embodiment described above is only that: in this example, the valve seat 4 is placed in the inner cavity of the valve body 1, and the limiting structure includes a constricted section 103 formed at the tail of the valve body 1. One end of the valve sleeve 2 abuts against the inner wall of the constricted section 103, and the other end abuts against the end of the valve seat 4. In this example, the valve sleeve 2 is simply installed into the valve body 1, and the inner and outer walls of the two can slide together. Then, the valve sleeve 2 can be limited and fixed by the inner wall of the constricted section 103 and the end wall of the valve seat 4, thus realizing the assembly of the valve sleeve 2. This assembly saves the spinning and fixing process of the valve sleeve 2. In addition, in this example, the constricted section 103 is a conical structure, which can have a better centering effect during the fitting process of the valve sleeve 2 and the constricted section 103, further improving the coaxiality of the valve sleeve 2 and the valve body 1.

[0078] Example 6

[0079] like Figure 10As shown, the only difference between this embodiment and the first embodiment above is that: in this example, the valve seat 4 is placed in the inner cavity of the valve body 1, and a stepped structure is also formed between the valve seat 4 and the valve body 1 to facilitate the axial positioning of the valve seat 4 and achieve the effect of rapid assembly of the valve seat 4.

[0080] Example 7

[0081] like Figure 11 As shown, this embodiment is based on the above embodiment five, and also includes a spring 7. The spring 7 is partially placed inside the guide sleeve 6, with one end extending to the outside of the guide sleeve 6 and located in the gap formed by the guide sleeve 6 and the fixed sleeve 202, and the other end extending towards the guide shaft 5 and able to contact the guide shaft 5 during operation. Specifically, the diameter of the end of the spring 7 placed in the gap formed by the guide sleeve 6 and the fixed sleeve 202 is larger than the diameter of the main body of the spring 7. When assembling the guide sleeve 6, the spring 7 can be pressed into place at the same time.

[0082] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A backflow prevention control device, characterized in that, include: The valve body (1) has a through channel inside; A valve seat (4) is fixed at one end of a valve body (1) and its inner cavity is connected to the internal channel of the valve body (1). A valve port (401) is formed at one end of the inner cavity of the valve seat (4). A valve sleeve (2) is provided inside the valve body (1) and is coaxially fixedly connected to the valve body (1). A fixing sleeve (202) is provided at the center of the valve sleeve (2). The fixing sleeve (202) extends away from the valve port (401). The guide sleeve (6) has one end fixed inside the fixed sleeve (202) and the other end extends toward the valve port (401); The valve core assembly slides in conjunction with the guide sleeve (6). The valve core assembly is configured to cooperate with the valve port (401). When the valve core assembly is in contact with the valve port (401), the valve core assembly isolates the internal channel of the valve body (1). When the valve core assembly is separated from the valve port (401), the internal channel of the valve body (1) is connected.

2. The anti-backflow control device according to claim 1, characterized in that, The valve sleeve (2) is an integrally stamped or machined through-end sleeve structure.

3. The anti-backflow control device according to claim 1, characterized in that, The valve sleeve (2) has a liquid passage hole (201) at its end position. There are several liquid passage holes (201) and they are evenly distributed around the center of the valve sleeve (2).

4. The anti-backflow control device according to claim 1, characterized in that, The valve core assembly includes a guide shaft (5) that is at least partially placed inside the fixed sleeve (202) and slidably engaged with the fixed sleeve (202), and the valve core (3) is connected to one end of the guide shaft (5) near the valve port (401).

5. The anti-backflow control device according to claim 4, characterized in that, The fixed sleeve (202) has a pressure relief hole (203) at the center of its end, and the pressure relief hole (203) is connected to the inner cavity of the guide sleeve (6).

6. The anti-backflow control device according to claim 4, characterized in that, The guide sleeve (6) has a folded edge (601) formed by folding outward at one end near the valve port (401). The outer end face of the folded edge (601) is a plane perpendicular to the center line of the guide sleeve (6). The outer end face of the folded edge (601) can abut against the end face of the valve core (3).

7. The anti-backflow control device according to claim 1, characterized in that, A limiting structure is provided between the valve sleeve (2) and the valve body (1) for axially limiting the valve sleeve (2) within the valve body (1).

8. The anti-backflow control device according to claim 7, characterized in that, The limiting structure includes a first stepped portion (101) formed on the inner wall of the valve body (1) and extending towards its center, and a second stepped portion (204) formed on the outer wall of the valve sleeve (2) and extending radially outward therefrom, wherein the end face of the first stepped portion (101) and the end face of the second stepped portion (204) are in contact; or The limiting structure includes a third stepped portion (102) formed at the tail of the valve body (1) and extending towards its center, the end of the valve sleeve (2) abutting against the end face of the third stepped portion (102); or The limiting structure includes a constricted section (103) formed at the tail of the valve body (1), one end of the valve sleeve (2) abuts against the inner wall of the constricted section (103), and the other end abuts against the end of the valve seat (4).

9. The anti-backflow control device according to claim 1, characterized in that, The valve seat (4) is located in the inner cavity of the valve body (1) or one end of the valve seat (4) extends to the outside of the valve body (1), and a welding groove (402) is formed between the valve seat (4) and the valve body (1).

10. The anti-backflow control device according to claim 1, characterized in that, It also includes a spring (7), which is partially placed inside the guide sleeve (6), with one end extending to the outside of the guide sleeve (6) and located in the gap formed between the guide sleeve (6) and the fixed sleeve (202), and the other end extending toward the guide shaft (5) and able to contact the guide shaft (5) during operation.

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