Axial flow check valve

Abstract

The utility model discloses an axial flow check valve, which belongs to the field of valve technology. The utility model includes a valve body, which has openings at both ends, one end being an inlet end and the other end being an outlet end, and a cavity is formed inside the valve body. A guide body is arranged in the cavity, and the guide body is connected to a valve disc through a slow closing structure; a valve seat is arranged at the inlet end of the valve body, and the slow closing structure can drive the valve disc to slowly approach the valve seat; the valve seat is connected to the valve body through a fixed structure; the guide body is connected to the valve body through a support body, and the valve body, the guide body and the support body are an integrated structure. By arranging a slow closing structure in the guide body, the valve disc slowly approaches the valve seat when closing, avoiding impact on the valve seat, thereby enabling the valve seat to complete the connection with the valve body without a multi-stage locking structure, and is not easy to loosen. The guide body is connected to the valve body by a support body, and the support body, the guide body and the valve body are formed in one piece, which eliminates the problem that the valve disc deviates from the axis and cannot close the valve due to unstable support of the guide body.

Description

Technical Field

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

[0002] A check valve is an automatic valve that controls the one-way flow of a medium. It is widely used in water pump pressurized pipeline systems. It is usually used as a check valve after the pump to prevent the medium from flowing back after the pump is stopped and to cut off the pressure wave in time. Axial flow check valve is a type of check valve. In addition to the functions of a general check valve, it also has the advantages of small flow resistance, large flow coefficient, and small size.

[0003] In the prior art, the axial flow check valve has the following problems: first, the valve seat is generally formed integrally with the valve body. Due to the reduced diameter formed at the valve seat position, the inner diameter is small, which makes it impossible to install the valve disc from the front valve port of the valve body, making it inconvenient to install the valve disc. Second, when the check valve is closed, due to the large return thrust of the return structure, the valve disc directly impacts the valve seat. When the valve seat and the valve body are designed as a split structure for easy installation of the valve seat, the valve seat is easy to loosen. In order to prevent the valve seat from loosening, a multi-stage locking structure is used to lock the valve seat, making the check valve structure complex and inconvenient to process and install.

[0004] For example, Chinese patent document CN109826983A discloses a cryogenic axial flow check valve, including a valve body, a valve seat pressure ring, a valve seat locking ring, a guide seat fixed in the valve body, a bushing fixed on the guide seat, a valve shaft slidably connected to the bushing, a valve flap fixedly connected to one end of the valve shaft, and a valve seat installed in the valve body, a spring for resetting the valve flap and buffering at the same time is provided between the valve flap and the bushing; a section of internal thread is provided in the valve cavity of the valve body, and the valve seat pressure ring and the valve seat locking ring are both provided with external threads adapted to the internal thread, the valve seat pressure ring is screwed into the valve cavity to press against the valve seat, and the valve seat locking ring is screwed into the valve cavity to press against the valve seat pressure ring. This application adopts a multi-section locking structure, which makes the check valve complex and inconvenient to process and install. Utility Model Content

[0005] 1. Technical problems to be solved by the utility model

[0006] In view of the problem that the check valve seat in the prior art is easy to loosen, and the use of a multi-stage locking structure makes the check valve structure complex and inconvenient to process, the utility model provides an axial flow check valve to solve the above problems.

[0007] 2. Technical solution

[0008] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0009] The utility model discloses an axial flow check valve, comprising a valve body, wherein both ends of the valve body are open, one end is an inlet end, the other end is an outlet end, a cavity is formed inside, a guide body is arranged in the cavity, and the guide body is connected to a valve disc through a slow-closing structure; a valve seat is arranged at the inlet end of the valve body; the valve seat is detachably connected to the valve body through a fixed structure; the guide body is connected to the valve body through a support body, and the valve body, the guide body and the support body are an integrated structure.

[0010] As a further improvement of the utility model, the valve seat includes a seat body, and the fixed structure includes a first section, a second section and a third section arranged on the outer circle of the seat body, and the diameters of the first section, the second section and the third section decrease successively.

[0011] As a further improvement of the present invention, a stepped surface is formed at the connection between the first section and the second section, and a threaded structure is provided on the second section.

[0012] As a further improvement of the utility model, the free end of the first section is provided with a flange protruding outward, the flange is in contact with the inlet end of the valve body, and a second sealing ring is provided between the flange and the valve body.

[0013] As a further improvement of the utility model, along the valve seat installation direction, the diameter of the end of the third section close to the valve disc gradually decreases to form a conical surface; the conical surface of the third section is tightly fitted with the valve body, and the remaining part is loosely fitted with the valve body.

[0014] As a further improvement of the utility model, a third sealing ring is arranged between the third section and the valve body; a through channel is opened in the middle of the seat body, and a notch groove is opened on the inner wall of the channel; the diameter of the channel first gradually decreases and then gradually increases along the installation direction.

[0015] As a further improvement of the utility model, the guide body includes a guide wall, a fluid channel is formed between the guide wall and the valve body, and the fluid channel gradually becomes larger from the inlet end to the outlet end of the valve body.

[0016] As a further improvement of the utility model, the valve flap comprises a flap body, a valve flap shaft is arranged on one side of the flap body, and the valve flap shaft is connected to the slow-closing structure.

[0017] As a further improvement of the utility model, a first sealing ring is arranged on the other side of the valve body, and the first sealing ring is a soft sealing ring or a hard sealing structure.

[0018] As a further improvement of the utility model, when the first sealing ring is a soft sealing ring, the petal body is provided with a fixing piece to fix the first sealing ring on the petal body; when the first sealing ring is a hard sealing structure, the first sealing ring is welded to the petal body.

[0019] 3. Beneficial effects

[0020] Compared with the existing known technologies, the technical solution provided by the utility model has the following significant effects:

[0021] The utility model provides an axial flow check valve, by providing a slow closing structure in the guide body, connecting the slow closing structure with the valve disc, so that the valve disc slowly approaches the valve seat when closing, avoiding impact on the valve seat, and thus the valve seat can be connected to the valve body without a multi-stage locking structure, and is not easy to loosen, so that the check valve has a simple structure and is easy to process and install. At the same time, in order to prevent the instability of the connection between the guide body and the valve body due to internal liquid impact, the utility model uses a support body to connect the guide body to the valve body, and the support body, the guide body and the valve body are integrally formed, eliminating the problem of the valve disc deviating from the axis and being unable to close the valve due to the unstable support of the guide body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A cross-sectional view of a new type of check valve used herein;

[0023] Figure 2 for Figure 1 A partial enlarged view of part A in the middle.

[0024] Explanation of the numbers in the schematic diagram:

[0025] 1. Valve body; 11. Inlet section; 12. Flow section; 13. Support body; 14. Installation part;

[0026] 2. guide body; 21. guide wall; 22. connecting rod; 23. bushing; 24. reinforcement part; 25. slow closing structure; 251. quick closing element; 252. transmission part; 253. slow closing element;

[0027] 3. Valve disc; 31. Valve body; 32. First sealing ring; 33. Fixing member; 34. Valve disc shaft;

[0028] 4. Valve seat; 41. Seat body; 42. Threaded structure; 43. Stepped table; 44. Second sealing ring; 45. Third sealing ring; 46. Flange; 47. First section; 48. Second section; 49. Third section. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0035] Example

[0036] Combination Figure 1 An axial flow check valve of this embodiment includes a valve body 1. The valve body 1 is a columnar structure with openings at both ends, one end being an inlet end and the other end being an outlet end, and a cavity is formed inside. The valve body 1 of this embodiment is divided into an inlet section 11 and a flow section 12. The inlet end is located at the opening of the inlet section 11. The inner diameter of the valve body 1 gradually increases from the inlet section 11 to the flow section 12, and the inlet section 11 and the flow section 12 have a smooth transition. The inner diameter of the valve body 1 gradually decreases from the flow section 12 to the outlet end. An outwardly extending mounting portion 14 is provided at both the inlet end and the outlet end of the valve body 1 to facilitate the installation of the check valve.

[0037] In this embodiment, a guide body 2 is arranged in the cavity inside the valve body 1, and the guide body 2 is connected to the inner wall of the valve body 1 through a support body 13. At the same time, the valve body 1, the support body 13 and the guide body 2 are integrally formed, so that the guide body 2 can be firmly connected to the valve body 1. The support body 13 is located in the middle of the guide body 2, and the forces on both sides are balanced. The guide body 2 of this embodiment includes a guide wall 21, and the guide wall 21 is conical, with the smaller end facing the outlet end of the valve body 1. A fluid channel is formed between the guide wall 21 and the valve body 1, and the fluid channel gradually becomes larger from the inlet end of the valve body 1 to the outlet end, thereby forming a Venturi nozzle. Such a design enables the liquid inside the valve body 1 to reduce the impact on the guide body 2, and further reduces the possibility of unstable support of the guide body 2. A cavity is formed inside the guide wall 21, and a sleeve 23 is arranged on the central axis of the guide body 2, and the sleeve 23 is fixedly connected to the guide wall 21 through a plurality of connecting rods 22. The sleeve 23 is also connected to the end of the guide body 2, and the end of the guide body 2 and the connecting rod 22 together form a two-point support for the sleeve 23, so that the sleeve 23 is firmly fixed. The sleeve 23 is also connected to the end of the guide body 2 and a reinforcement part 24 is provided to prevent the sleeve 23 from breaking.

[0038] In this embodiment, a slow closing structure 25 is arranged inside the sleeve 23, and the slow closing structure 25 includes a quick closing element 251 and a slow closing element 253. A transmission member 252 is arranged between the quick closing element 251 and the slow closing element 253. One end of the quick closing element 251 is connected to the transmission member 252, and the other end is connected to the valve flap shaft 34. The quick closing element 251 and the slow closing element 253 are both springs, and the elastic coefficients of the two are different. The elastic force of the quick closing element 251 is greater than that of the slow closing element 253. When the valve flap 3 is closed, the quick closing element 251 first pushes the transmission member 252, the slow closing element 253 and the valve flap shaft 34 to move together. When the thrust of the quick closing element 251 disappears, the quick closing element 251 is released, pushing the valve flap shaft 34 to move slowly. By releasing the two sections of the spring, the valve flap 3 slowly approaches the valve seat 4, thereby avoiding the impact of the valve flap 3 on the valve seat 4.

[0039] In this embodiment, the valve flap 3 also includes a flap body 31, one side of the flap body 31 is connected to the flap shaft 34, and the other side is provided with a first sealing ring 32. The first sealing ring 32 of this embodiment is a soft sealing ring or a hard sealing structure. When the first sealing ring 32 is a soft sealing ring, the flap body 31 is provided with a fixing member 33 to fix the first sealing ring 32 on the flap body 31; when the first sealing ring 32 is a hard sealing structure, the first sealing ring 32 is welded to the flap body 31. When the first sealing ring 32 is a soft sealing ring, a material such as rubber is selected. When the first sealing ring 32 is a hard sealing structure, the selected material is stainless steel or copper.

[0040] Combination Figure 2In this embodiment, a valve seat 4 is provided at the inlet end of the valve body 1, and the valve seat 4 is connected to the valve body 1 through a fixed structure. Specifically, the valve seat 4 includes a seat body 41, and the fixed structure includes a first section 47, a second section 48 and a third section 49 provided on the outer circle of the seat body 41, and the diameters of the first section 47, the second section 48 and the third section 49 decrease successively. In this embodiment, an outwardly protruding flange 46 is provided at the end of the first section 47 of the seat body 41 close to the inlet end of the valve body 1, and the flange 46 contacts the inlet end of the valve body 1, and a second sealing ring 44 is provided between the flange 46 and the valve body 1. The sealing structure provided here can ensure that no liquid enters between the valve body 1 and the valve seat 4, and corrosion of the contact surface between the two is avoided, thereby reducing the possibility of unstable installation of the valve seat 4. A stepped table 43 is formed at the connection between the first section 47 and the second section 48, and a threaded structure 42 is provided on the second section 48. The valve seat 4 is screwed together with the valve body 1 through the threaded structure 42. The advantage of such a design is that when the valve seat 4 is installed, the end of the valve seat 4 facing the inside of the valve body 1 is not easy to collide with the threaded structure 42 and cause damage due to the reduced outer diameter, which is more convenient to install. Along the installation direction of the valve seat 4, the diameter of the third section 49 at the end close to the valve disc 3 gradually decreases to form a conical surface. The inner diameter of the valve body 1 at this position also gradually decreases, but the reduction in the inner diameter of the valve body 1 is greater than the reduction in the diameter of the end of the third section 49. The two are close to form a tight fit. At the same time, the ends of the valve body 1 and the third section 49 form conical surfaces to ensure that the seat body 41 can be pressed against the valve body 1, thereby further firmly installing. The conical surface of the third section 49 is tightly matched with the valve body 1, and the rest of the part is loosely matched with the valve body 1. A third sealing ring 45 is arranged between the third section 49 and the valve body 1. When installing the valve seat 4, only this section is a tight fit, which can ensure sealing and facilitate installation and disassembly. The third sealing ring 45 is provided to further ensure the sealing performance, and the cooperation between the second sealing ring 44 and the third sealing ring 45 further ensures that no liquid will enter between the valve body 1 and the valve seat 4. A through channel is provided in the middle of the seat body 41, and a notch groove is provided on the inner wall of the channel, which facilitates the application of force to the seat body 41 during installation and facilitates the installation of the seat body 41. At the same time, the diameter of the channel gradually decreases and then gradually increases along the installation direction, thereby forming a Venturi nozzle.

[0041] In the present embodiment, an axial flow check valve is provided with a slow closing structure 25 in the guide body 2, and the slow closing structure 25 is connected to the valve flap 3, so that the valve flap 3 slowly approaches the valve seat 4 when closing, thereby avoiding impact on the valve seat 4, and thus the valve seat 4 can be connected to the valve body 1 without a multi-stage locking structure, and is not easy to loosen, so that the check valve structure is simple and easy to process and install. At the same time, in order to prevent the instability of the connection between the guide body 2 and the valve body 1 caused by the impact of the internal liquid, the present embodiment uses a support body 13 to connect the guide body 2 to the valve body 1, and the support body 13, the guide body 2 and the valve body 1 are integrally formed, thereby eliminating the problem that the valve flap 3 deviates from the axis and cannot close the valve due to the unstable support of the guide body 2.

[0042] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. An axial flow check valve, comprising a valve body (1), wherein the valve body (1) is open at both ends, one end is an inlet end, the other end is an outlet end, and a cavity is formed inside, characterized in that: A flow guide (2) is arranged in the cavity, and the flow guide (2) is connected to the valve disc (3) via a slow-closing structure (25); a valve seat (4) is arranged at the inlet end of the valve body (1); the valve seat (4) is detachably connected to the valve body (1) via a fixed structure; the flow guide (2) is connected to the valve body (1) via a support body (13), and the valve body (1), the flow guide (2) and the support body (13) are an integrated structure; The valve seat (4) comprises a seat body (41), and the fixing structure comprises a first section (47), a second section (48), and a third section (49) arranged on the outer circle of the seat body (41), and the diameters of the first section (47), the second section (48), and the third section (49) decrease successively.

2. An axial flow check valve according to claim 1, characterized in that: A stepped table surface (43) is formed at the connection between the first section (47) and the second section (48), and a threaded structure (42) is provided on the second section (48).

3. An axial flow check valve according to claim 1, characterized in that: The free end of the first section (47) is provided with a flange (46) protruding outwards, the flange (46) is in contact with the inlet end of the valve body (1), and a second sealing ring (44) is provided between the flange (46) and the valve body (1).

4. An axial flow check valve according to claim 1, characterized in that: Along the installation direction of the valve seat (4), the diameter of the end of the third section (49) close to the valve disc gradually decreases to form a conical surface; the conical surface of the third section (49) is tightly fitted with the valve body (1), and the remaining part is loosely fitted with the valve body (1).

5. An axial flow check valve according to claim 4, characterized in that: A third sealing ring (45) is provided between the third section (49) and the valve body (1); a through channel is provided in the middle of the seat body (41), and a notch groove is provided on the inner wall of the channel; and the diameter of the channel gradually decreases and then gradually increases along the installation direction.

6. An axial flow check valve according to any one of claims 1 to 5, characterized in that: The flow guide (2) comprises a flow guide wall (21), a fluid channel is formed between the flow guide wall (21) and the valve body (1), and the fluid channel gradually becomes larger from the inlet end to the outlet end of the valve body (1).

7. An axial flow check valve according to any one of claims 1 to 5, characterized in that: The valve flap (3) comprises a flap body (31), a valve flap shaft (34) is provided on one side of the flap body (31), and the valve flap shaft (34) is connected to the slow-closing structure (25).

8. An axial flow check valve according to claim 7, characterized in that: A first sealing ring (32) is provided on the other side of the valve body (31), and the first sealing ring (32) is a soft sealing ring or a hard sealing structure.

9. An axial flow check valve according to claim 8, characterized in that: When the first sealing ring (32) is a soft sealing ring, the petal body (31) is provided with a fixing piece (33) to fix the first sealing ring (32) on the petal body (31); when the first sealing ring (32) is a hard sealing structure, the first sealing ring (32) is welded to the petal body (31).

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