Axial flow check valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to an axial flow check valve which comprises a valve body, a support, a valve clack and a spring set. The support is arranged in the valve body, a flow channel is formed between the outer wall of the support and the inner wall of the valve body, and a guide sleeve is arranged on the support. The valve clack is arranged in the valve body and matched with the valve seat to form sealing, a guide rod is arranged on the valve clack, one end of the guide rod is slidably connected with the guide sleeve, and the valve clack can get close to and get away from the support; the spring set is arranged between the valve clack and the support and comprises two sets of one-way springs which are the same in number and opposite in rotation direction, and the two sets of one-way springs are extruded to deform in the process that the valve clack gets close to the support. Compared with the prior art, the axial check valve has the advantages that the stability of the valve clack in the moving process can be improved, friction and abrasion of a sealing pair and a guide surface are reduced, and the service life of the check valve is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and in particular relates to an axial flow check valve. Background Art

[0002] Axial flow check valves are a special type of check valve whose operating principle and structural design are designed to allow free flow of media in one direction while preventing reverse flow. Unlike traditional swing or lift check valves, axial flow check valves are designed to reduce pressure drop, improve efficiency, and accommodate high-speed flow conditions.

[0003] Existing axial flow check valves, such as a cantilevered disc-type axial flow check valve with publication number CN214466351U, have a unidirectional cylindrical spring arranged on the guide rod for moving the valve disc. During the process of opening and closing the axial flow check valve due to the flow of the medium, the valve disc will generate a circumferential force due to the expansion and contraction of the cylindrical spring, resulting in relative friction movement between the sealing surface of the valve disc and the valve seat, and relative friction between the guide rod and the guide sleeve, which makes the moving pair prone to wear and damage. Therefore, this type of axial flow check valve needs to be improved. Utility Model Content

[0004] The purpose of the utility model is to provide an axial flow check valve in response to the above-mentioned technical problems, which can improve the stability of the valve disc during movement, reduce the friction and wear of the sealing pair and the guide surface, and extend the service life of the check valve.

[0005] In view of this, the utility model provides an axial flow check valve, comprising:

[0006] a valve body, wherein a valve seat is provided in the valve body;

[0007] The bracket is arranged in the valve body, a flow channel is formed between the outer wall of the bracket and the inner wall of the valve body, and a guide sleeve is provided on the bracket;

[0008] The valve disc is arranged in the valve body and cooperates with the valve seat to form a seal. The valve disc is provided with a guide rod, one end of which is slidably connected to the guide sleeve, so that the valve disc can move closer to and away from the bracket;

[0009] The spring group is arranged between the valve disc and the bracket. The spring group includes two groups of one-way springs with the same number but opposite rotation directions. When the valve disc approaches the bracket, both groups of one-way springs are squeezed and deformed.

[0010] In this technical solution, when the medium in the valve body needs to flow in the forward direction, the medium will push the valve disc toward the bracket to open the valve. During this process, the valve disc squeezes the spring group, and both sets of one-way springs are squeezed and deformed. When the medium does not need to flow or the medium flows backward, the elastic force of the spring group pushes the valve disc away from the bracket to close the valve. During the entire opening and closing process of the valve, the two sets of one-way springs with opposite rotation directions can offset each other's circumferential rotational force when they expand and contract.

[0011] In the above technical solution, further, the guide sleeve includes an outer mounting sleeve and an inner mounting sleeve, the outer wall of the outer mounting sleeve is connected to the bracket, the outer wall of the inner mounting sleeve is connected to the inner wall of the outer mounting sleeve, one end of the guide rod is slidably connected to the inner wall of the inner mounting sleeve, and two groups of one-way springs are both mounted on the outside of the guide rod, one end of one group of one-way springs is connected to the outer mounting sleeve, and one end of the other group of one-way springs is connected to the inner mounting sleeve.

[0012] In the above technical solution, further, the outer mounting sleeve is threadedly connected to the bracket to adjust the position of the outer mounting sleeve in the axial direction of the guide rod.

[0013] In the above technical solution, further, the inner mounting sleeve is threadedly connected to the outer mounting sleeve to adjust the position of the inner mounting sleeve in the axial direction of the guide rod.

[0014] In the above technical solution, further, a mounting plate is provided at one end of the bracket away from the valve disc, and the mounting plate is detachably connected to the valve body.

[0015] In the above technical solution, further, a flow guide cover is provided on the outer wall of the bracket.

[0016] The beneficial effects of the utility model are:

[0017] 1. The valve disc is driven to close by two sets of one-way springs with the same number but opposite rotation directions. During the movement of the valve disc, the two sets of one-way springs can offset each other's circumferential rotational force when expanding and contracting, thereby reducing the impact of the unidirectional circumferential force on the valve disc caused by the expansion and contraction of a single spring, improving the stability of the valve disc during movement, reducing the friction and wear of the sealing pair and guide surface, extending the service life of the valve, and improving the sealing performance of the valve.

[0018] 2. By sleeveing ​​both sets of one-way springs on the outside of the guide rod and installing the ends of the two sets of one-way springs respectively through the outer mounting sleeve and the inner mounting sleeve, the force exerted on the valve disc by the two sets of one-way springs is located in the center of the valve disc, making the force on the valve disc more evenly distributed, further reducing the friction and wear of the sealing pair and the guide surface.

[0019] 3. By designing the outer mounting sleeve to be able to adjust its position along the axial direction of the guide rod on the bracket, and designing the inner mounting sleeve to be able to adjust its position along the axial direction of the guide rod on the outer mounting sleeve, the preload force of the two sets of one-way springs can be adjusted, thereby ensuring the sealing of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 It is a schematic diagram of the internal cross-sectional structure of the utility model.

[0022] Figure 2 This is a schematic diagram of the connection structure between the bracket and the valve disc in the utility model.

[0023] Figure 3 This is a schematic diagram of the connection structure of the guide rod, guide sleeve and spring group of the utility model.

[0024] Figure 4 This is a schematic diagram of the assembly state of the inner mounting sleeve and the outer mounting sleeve under the threaded connection structure in the present invention.

[0025] Figure 5 This is a schematic diagram of the disassembled state of the threaded connection structure of the inner mounting sleeve and the outer mounting sleeve in the present invention.

[0026] The marks in the figure are:

[0027] 1. Valve body; 2. Valve seat; 3. Bracket; 41. Outer mounting sleeve; 42. Inner mounting sleeve; 5. Valve disc; 6. Guide rod; 7. Spring assembly; 8. Mounting plate; 9. Flow deflector; 10. Protrusion; 11. Through hole; DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] In the description of the present utility model, it should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The techniques, methods and equipment known to ordinary technicians in the relevant fields may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, so once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0030] Example 1

[0031] like Figure 1 As shown, this embodiment provides an axial flow check valve, including: a valve body 1, a bracket 3, a valve disc 5, a spring assembly 7,

[0032] The valve body 1 has a valve cavity communicating with both ends of the valve body 1. The valve body 1 is provided with a valve seat 2. A conducting hole 11 is provided in the middle of the valve seat 2. The medium can flow in the valve cavity through the conducting hole 11.

[0033] The bracket 3 is arranged on the side of the valve body 1 away from the valve seat 2. A flow channel is formed between the outer wall of the bracket 3 and the inner wall of the valve body 1. A guide sleeve is provided on the bracket 3. Figure 1 and Figure 2 , a guide cover 9 is provided on the outer wall of the bracket 3, and the guide cover 9 can guide the flow direction of the medium to concentrate the medium;

[0034] The valve disc 5 is arranged between the bracket 3 and the valve seat 2. The end of the valve disc 5 away from the bracket 3 can be sealed with the end of the valve seat 2 to block the guide hole 11, thereby closing the valve. The valve disc 5 can approach and move away from the bracket 3. When the valve disc 5 blocks the guide hole 11, it is located at a position away from the bracket 3. When the valve disc 5 approaches the bracket 3, it separates from the valve seat 2 to open the guide hole 11, thereby opening the valve. A guide rod 6 is provided on the valve disc 5. One end of the guide rod 6 is slidably connected to the guide sleeve. The guide rod 6 and the guide sleeve cooperate to guide the movement of the valve disc 5.

[0035] The spring group 7 is provided between the valve disc 5 and the bracket 3. The spring group 7 includes two sets of one-way springs of the same number but opposite rotation directions. The opposite rotation directions of the two sets of one-way springs here can be understood as one set of one-way springs being left-handed springs and the other set of one-way springs being right-handed springs. When the valve disc 5 closes the valve, both sets of one-way springs will apply a pre-tightening force to the valve disc 5, so that the valve disc 5 stably blocks the guide hole 11. When the valve disc 5 approaches the bracket 3, both sets of one-way springs are squeezed and deformed.

[0036] In this embodiment, the number of one-way springs in each group of one-way springs can be one or more, and the figure shows one as an example;

[0037] In this embodiment, when the medium in the valve body 1 needs to flow in the forward direction, the medium will push the valve disc 5 toward the bracket 3 to open the valve. In this process, the valve disc 5 squeezes the spring group 7, and both groups of one-way springs are squeezed and deformed. When the medium does not need to circulate or the medium flows back, the elastic force of the spring group 7 pushes the valve disc 5 away from the bracket 3 to close the valve. During the entire opening and closing process of the valve, the two groups of one-way springs with opposite rotation directions can offset each other's circumferential rotational forces when they expand and contract; thereby reducing the influence of the unidirectional circumferential force caused by the expansion and contraction of a single spring on the valve disc 5, improving the stability of the valve disc 5 during movement, reducing the friction and wear of the sealing pair and the guide surface, extending the service life of the valve, and improving the sealing performance of the valve.

[0038] Example 2

[0039] This embodiment provides an axial flow check valve, which, in addition to the technical solutions of the above embodiments, also discloses a configuration method of the spring assembly 7;

[0040] See also Figure 2 The guide sleeve includes an outer mounting sleeve 41 and an inner mounting sleeve 42. The outer wall of the outer mounting sleeve 41 is connected to the bracket 3, and the outer wall of the inner mounting sleeve 42 is connected to the inner wall of the outer mounting sleeve 41. One end of the guide rod 6 is slidably connected to the inner wall of the inner mounting sleeve 42. Two sets of one-way springs are both sleeved on the outside of the guide rod 6. The middle diameters of the two sets of one-way springs are different. Please refer to Figure 3 One end of one set of one-way springs is connected to the outer mounting sleeve 41, and one end of the other set of one-way springs is connected to the inner mounting sleeve 42. Figure 1 A groove is provided in the middle of the end of the valve disc 5 away from the valve seat 2, and a protrusion 10 is provided on the guide rod 6. One end of the protrusion 10 is located in the groove so that the valve disc 5 can drive the guide rod 6 to move axially when approaching the bracket 3. The end of a group of one-way springs with a smaller middle diameter away from the bracket 3 is connected to the protrusion 10, and the end of a group of one-way springs with a larger middle diameter away from the bracket 3 is connected to the end face of the valve disc 5;

[0041] Through the technical solution of this embodiment, the force exerted on the valve flap 5 by the two groups of one-way springs is located at the center of the valve flap 5, so that the force on the valve flap 5 is more uniform, further reducing the friction and wear of the sealing pair and the guide surface.

[0042] Example 3

[0043] This embodiment provides an axial flow check valve. In addition to the technical solutions of the above embodiments, the axial flow check valve is also optimized.

[0044] In this embodiment, specifically, a threaded hole is provided in the middle of the bracket 3, see Figure 4 A first external thread is provided on the outer wall of the outer mounting sleeve 41, and the outer mounting sleeve 41 is threadedly connected to the bracket 3. By rotating the outer mounting sleeve 41, the position can be adjusted axially along the guide rod 6 on the bracket 3. In this way, the preload force of the one-way spring on the outer mounting sleeve 41 can be adjusted, so that the size of the circumferential force generated by the two groups of one-way springs can be adjusted, thereby improving the stability of the valve disc 5 during movement.

[0045] In this embodiment, please refer to Figure 5 An internal thread is provided on the inner wall of the outer mounting sleeve 41, and a second external thread is provided on the outer wall of the inner mounting sleeve 42. The inner mounting sleeve 42 is threadedly connected to the outer mounting sleeve 41. By rotating the inner mounting sleeve 42, the position of the outer mounting sleeve 41 along the axial direction of the guide rod 6 can be adjusted. In this way, the preload force of the two sets of one-way springs can be adjusted, further improving the stability of the valve disc 5 during movement, and the initial preload force of the valve disc 5 can be adjusted to ensure the sealing of the check valve.

[0046] As a preferred embodiment of this invention, please refer to Figure 1 A mounting plate 8 is provided at the end of the bracket 3 away from the valve disc 5. The mounting plate 8 is detachably connected to the valve body 1. The mounting plate 8 and the valve body 1 can be connected by fasteners. The bracket 3 can be disassembled and assembled by disassembling the mounting plate 8, which facilitates the disassembly and assembly of the bracket 3 and also facilitates the disassembly and assembly of the two sets of one-way springs and the adjustment of the preload force.

[0047] The embodiments of the present invention are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. An axial flow check valve, characterized in that: include: A valve body (1), wherein a valve seat (2) is provided in the valve body (1); A bracket (3), the bracket (3) being arranged in the valve body (1), a flow channel being formed between an outer wall of the bracket (3) and an inner wall of the valve body (1), and a guide sleeve being provided on the bracket (3); a valve flap (5), the valve flap (5) being arranged in the valve body (1) and cooperating with the valve seat (2) to form a seal, the valve flap (5) being provided with a guide rod (6), one end of the guide rod (6) being slidably connected to the guide sleeve, and the valve flap (5) being able to move closer to and farther from the bracket (3); A spring group (7) includes two groups of one-way springs of the same number but opposite rotation directions, and both groups of one-way springs are squeezed and deformed when the valve flap (5) approaches the bracket (3).

2. An axial flow check valve according to claim 1, characterized in that: The guide sleeve comprises an outer mounting sleeve (41) and an inner mounting sleeve (42), the outer wall of the outer mounting sleeve (41) is connected to the bracket (3), the outer wall of the inner mounting sleeve (42) is connected to the inner wall of the outer mounting sleeve (41), one end of the guide rod (6) is slidably connected to the inner wall of the inner mounting sleeve (42), and two groups of one-way springs are both sleeved on the outside of the guide rod (6), one end of one group of one-way springs is connected to the outer mounting sleeve (41), and one end of the other group of one-way springs is connected to the inner mounting sleeve (42).

3. An axial flow check valve according to claim 2, characterized in that: The outer mounting sleeve (41) is threadedly connected to the bracket (3) to adjust the position of the outer mounting sleeve (41) in the axial direction of the guide rod (6).

4. An axial flow check valve according to claim 3, characterized in that: The inner mounting sleeve (42) is threadedly connected to the outer mounting sleeve (41) to adjust the position of the inner mounting sleeve (42) in the axial direction of the guide rod (6).

5. An axial flow check valve according to claim 3 or 4, characterized in that: An end of the bracket (3) away from the valve flap (5) is provided with a mounting plate (8), and the mounting plate (8) is detachably connected to the valve body (1).

6. The axial flow check valve according to claim 1, characterized in that: A flow guide cover (9) is provided on the outer wall of the bracket (3).

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