Micro-resistance slow-closing check valve

Abstract

The micro-resistance slow-closing check valve comprises a valve body, a valve plate, a valve shaft and a valve seat, the two ends of the valve body are fixedly connected to an upstream pipeline and a downstream pipeline respectively, the valve seat is arranged on an inner ring of the valve body, the periphery of the valve plate can abut against the inner edge of the valve seat, the valve plate is fixedly connected to the valve shaft in a sleeved mode, and the valve shaft is rotationally connected to the valve body in a sleeved mode. A heavy hammer is fixedly installed at one end of the valve seat through a connecting rod, a supporting plate is fixedly installed on the valve plate, a slow closing assembly is installed on the valve body, the movable end of the slow closing assembly can abut against one side of the supporting plate, the valve plate is used for connecting and disconnecting a passage of an upstream pipeline and a downstream pipeline, and the slow closing assembly can slow down rotation of the valve plate through the supporting plate. According to the micro-resistance slow-closing check valve, the slow-closing assembly is communicated with the upstream pipeline, the movable end of the slow-closing assembly is pushed to stretch out through medium pressure of the upstream pipeline, the closing speed of the valve plate is slowed down, damage of water hammer impact to the valve plate and the valve body is reduced, the service life of the device is prolonged, and vibration in the pipeline is prevented.

Description

Technical Field

[0001] The utility model belongs to the field of valves, in particular to a micro-resistance slow-closing check valve. Background Art

[0002] A check valve is a valve whose opening and closing part is a circular disc and which blocks the backflow of the medium by its own weight and the pressure of the medium. It is an automatic valve, also known as a non-return valve, a one-way valve, a reflux valve or an isolation valve; the movement of the disc is divided into a lifting type and a swing type. The function of this type of valve is to allow the medium to flow in one direction only and prevent it from flowing in the opposite direction. Under the pressure of the fluid flowing in one direction, the disc opens; when the fluid flows in the opposite direction, the fluid pressure and the self-reclosing disc of the disc act on the valve seat, thereby cutting off the flow. The check valve of the prior art closes the valve plate quickly when the upstream pressure is released, which easily causes water hammer to impact the valve plate, reducing the service life of the valve. Utility Model Content

[0003] In view of this, the utility model aims to propose a micro-resistance slow-closing check valve to solve the problem of the prior art check valve that the valve plate closes quickly when the upstream pressure is released, which easily causes water hammer to impact the valve plate and reduces the service life of the valve.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A micro-resistance slow-closing check valve comprises a valve body, a valve plate, a valve shaft and a valve seat, wherein two ends of the valve body are respectively fixedly connected to an upstream pipeline and a downstream pipeline, a valve seat is arranged in the inner ring of the valve body, the outer periphery of the valve plate can abut against the inner edge of the valve seat, the valve plate is fixedly sleeved on the valve shaft, and the valve shaft is rotatably sleeved on the valve body, a weight is fixedly installed on one end of the valve seat through a connecting rod, a support plate is fixedly installed on the valve plate, a slow-closing component is installed on the valve body, the movable end of the slow-closing component can abut against one side of the support plate, the valve plate is used to open and close the passage of the upstream pipeline and the downstream pipeline, and the slow-closing component can slow down the rotation of the valve plate through the support plate.

[0006] Furthermore, the slow-closing component includes a piston, a slow-closing cavity is provided on the valve body, the piston is slidably connected to the slow-closing cavity, one end of the piston can abut against one side of the support plate, and the other end of the piston is provided with a hydraulic space, which is connected to the upstream pipeline through a first water pipe.

[0007] Furthermore, a sealing cover is installed on the valve body, and the sealing cover is used to cover the slow-closing cavity, and a hydraulic space is formed between one end of the piston, the inner ring of the slow-closing cavity and one end of the sealing cover.

[0008] Furthermore, a through hole is provided in the middle of the cover, a guide rod is provided in the through hole, a guide head is provided at one end of the guide rod, a guide groove is provided at one end of the piston, and the guide head is slidably connected to the guide groove.

[0009] Furthermore, a retaining ring is installed inside the inner ring of one end of the guide groove, and one end of the guide head can abut against one end of the retaining ring.

[0010] Furthermore, an adjusting nut is arranged on the periphery of the guide rod, and the adjusting nut is used to fix the relative position of the guide rod and the sealing cover.

[0011] Furthermore, a pressure relief hole is arranged on the valve body, the pressure relief hole is connected to the slow closing cavity, and the pressure relief hole is not connected to the hydraulic space.

[0012] Furthermore, a sealing ring is arranged between the periphery of the piston and the inner ring of the slow-closing chamber.

[0013] Furthermore, the guide rod is a hollow tube structure, a through groove is provided on the side wall of the guide rod, and the upstream pipeline is connected to the hydraulic space and the guide groove through the first water pipe, the through groove, and the inner ring of the hollow tube body.

[0014] Furthermore, the guide head is a polygonal structure, and the inner circle of the guide groove is adapted to the outer contour of the guide head.

[0015] Compared with the prior art, the micro-resistance slow-closing check valve described in the utility model has the following beneficial effects:

[0016] (1) The micro-resistance slow-closing check valve described in the utility model has a slow-closing component that is connected to an upstream pipeline. The medium pressure in the upstream pipeline pushes the movable end of the slow-closing component to extend, thereby slowing down the closing speed of the valve plate, reducing the damage to the valve plate and the valve body caused by water hammer impact, increasing the service life of the device, and preventing vibration in the pipeline.

[0017] (2) In the micro-resistance slow-closing check valve described in the utility model, the guide rod is the guide structure of the piston. By adjusting the position of the guide head in the guide groove, the length of the piston extending out of the slow-closing chamber can be adjusted to facilitate adjustment of the opening of the valve plate when starting the slow closing.

[0018] (3) The micro-resistance slow-closing check valve described in the utility model has a pressure relief hole on the valve body, which is connected to the slow-closing chamber. The pressure relief hole is used to balance the pressure in the slow-closing chamber with the external pressure to prevent the problem of poor sliding of the piston caused by the pressure build-up in the slow-closing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0020] Figure 1 This is a front view structural diagram of a micro-resistance slow-closing check valve according to an embodiment of the utility model;

[0021] Figure 2 This is a schematic cross-sectional structure diagram of a micro-resistance slow-closing check valve according to an embodiment of the utility model;

[0022] Figure 3 for Figure 2 A partial enlarged view of middle A.

[0023] Description of reference numerals:

[0024] 1-valve body; 2-valve plate; 3-valve shaft; 4-valve seat; 5-slow-closing assembly; 51-piston; 52-slow-closing chamber; 53-hydraulic space; 54-cover; 55-guide rod; 56-guide head; 57-retaining ring; 58-adjusting nut; 59-pressure relief hole; 510-sealing ring; 511-first water pipe; 6-support plate; 7-connecting rod; 8-weight. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0028] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0029] like Figure 1-Figure 3As shown, the micro-resistance slow-closing check valve comprises a valve body 1, a valve plate 2, a valve shaft 3 and a valve seat 4, two ends of the valve body 1 are fixedly connected to the upstream pipeline and the downstream pipeline respectively, a valve seat 4 is arranged on the inner ring of the valve body 1, the periphery of the valve plate 2 can abut against the inner edge of the valve seat 4, the valve plate 2 is fixedly sleeved on the valve shaft 3, and the valve shaft 3 is rotatably sleeved on the valve body 1, one end of the valve seat 4 is fixedly installed with a weight 8 through a connecting rod 7, a support plate 6 is fixedly installed on the valve plate 2, a slow-closing component 5 is installed on the valve body 1, the movable end of the slow-closing component 5 can abut against one side of the support plate 6, the valve plate 2 is used to open and close the passage of the upstream pipeline and the downstream pipeline, the slow-closing component 5 can slow down the rotation of the valve plate 2 through the support plate 6, the slow-closing component 5 is connected with the upstream pipeline, and the movable end of the slow-closing component 5 is pushed out by the medium pressure of the upstream pipeline, so as to slow down the closing speed of the valve plate 2, reduce the damage of the valve plate 2 and the valve body 1 to the water hammer impact, increase the service life of the device, and prevent vibration in the pipeline.

[0030] The slow-closing component 5 includes a piston 51, and a slow-closing chamber 52 is provided on the valve body 1. The piston 51 is slidably connected to the slow-closing chamber 52. One end of the piston 51 can abut against one side of the support plate 6. The other end of the piston 51 is provided with a hydraulic space 53. The hydraulic space 53 is connected to the upstream pipeline through the first water pipe 511. A cover 54 is installed on the valve body 1. The cover 54 is used to cover the slow-closing chamber 52. A hydraulic space 53 is formed between one end of the piston 51, the inner ring of the slow-closing chamber 52 and one end of the cover 54. The hydraulic space 53 formed by the cover 54 is convenient for the staff to clean and maintain the inside of the slow-closing component 5.

[0031] A through hole is provided in the middle of the cover 54, and a guide rod 55 is provided in the through hole. A guide head 56 is provided at one end of the guide rod 55, and a guide groove is provided at one end of the piston 51. The guide head 56 is slidably connected to the guide groove. An adjusting nut 58 is provided on the periphery of the guide rod 55. The adjusting nut 58 is used to fix the relative position of the guide rod 55 and the cover 54. The guide rod 55 is a guiding structure of the piston 51. By adjusting the position of the guide head 56 in the guide groove, it is convenient to adjust the length of the piston 51 extending out of the slow closing chamber 52, so as to adjust the opening of the valve plate 2 when starting the slow closing. A retaining ring 57 is installed on the inner circle of one end of the guide groove, and one end of the guide head 56 can abut against one end of the retaining ring 57. The retaining ring 57 is used to prevent the guide head 56 from detaching from the piston 51. A sealing ring 510 is provided between the periphery of the piston 51 and the inner circle of the slow closing chamber 52 to ensure the sealing of this part.

[0032] A pressure relief hole 59 is provided on the valve body 1, and the pressure relief hole 59 is connected to the slow closing chamber 52, and the pressure relief hole 59 is not connected to the hydraulic space 53. The pressure relief hole 59 is used to balance the pressure of the slow closing chamber 52 and the outside to prevent the problem of poor sliding of the piston 51 caused by the pressure accumulation in the slow closing chamber 52.

[0033] The guide rod 55 is a hollow tube structure, and a through groove is provided on the side wall of the guide rod 55. The upstream pipeline is connected to the hydraulic space 53 and the guide groove through the first water pipe 511, the through groove, and the inner circle of the hollow tube body. A regulating valve is provided on the first water pipe 511. The guide head 56 is a polygonal structure. The inner circle of the guide groove is adapted to the outer contour of the guide head 56. The polygonal guide head 56 is used to prevent the piston 51 from rotating to ensure the sealing performance.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro-resistance slow-closing check valve, comprising a valve body (1), a valve plate (2), a valve shaft (3) and a valve seat (4), wherein the two ends of the valve body (1) are fixedly connected to an upstream pipeline and a downstream pipeline respectively, a valve seat (4) is arranged on the inner ring of the valve body (1), the outer periphery of the valve plate (2) can abut against the inner edge of the valve seat (4), the valve plate (2) is fixedly sleeved on the valve shaft (3), and the valve shaft (3) is rotatably sleeved on the valve body (1), and a weight (8) is fixedly installed on one end of the valve seat (4) through a connecting rod (7), characterized in that: A support plate (6) is fixedly mounted on the valve plate (2), a slow-closing assembly (5) is mounted on the valve body (1), a movable end of the slow-closing assembly (5) can abut against one side of the support plate (6), the valve plate (2) is used to open and close passages of an upstream pipeline and a downstream pipeline, and the slow-closing assembly (5) can slow down the rotation of the valve plate (2) through the support plate (6).

2. The micro-resistance slow-closing check valve according to claim 1, characterized in that: The slow-closing assembly (5) comprises a piston (51), a slow-closing chamber (52) is provided on the valve body (1), the piston (51) is slidably connected to the slow-closing chamber (52), one end of the piston (51) can abut against one side of the support plate (6), and the other end of the piston (51) is provided with a hydraulic space (53), and the hydraulic space (53) is connected to the upstream pipeline through the first water pipe (511).

3. The micro-resistance slow closing check valve according to claim 2 is characterized in that: A sealing cover (54) is installed on the valve body (1), and the sealing cover (54) is used to cover the slow closing chamber (52). A hydraulic space (53) is formed between one end of the piston (51), the inner ring of the slow closing chamber (52) and one end of the sealing cover (54).

4. The micro-resistance slow-closing check valve according to claim 3 is characterized in that: A through hole is provided in the middle of the cover (54), a guide rod (55) is provided in the through hole, a guide head (56) is provided at one end of the guide rod (55), a guide groove is provided at one end of the piston (51), and the guide head (56) is slidably connected to the guide groove.

5. The micro-resistance slow-closing check valve according to claim 4, characterized in that: A retaining ring (57) is installed inside one end of the guide groove, and one end of the guide head (56) can abut against one end of the retaining ring (57).

6. The micro-resistance slow closing check valve according to claim 4, characterized in that: An adjusting nut (58) is arranged on the periphery of the guide rod (55), and the adjusting nut (58) is used to fix the relative position of the guide rod (55) and the sealing cover (54).

7. The micro-resistance slow-closing check valve according to claim 2, characterized in that: A pressure relief hole (59) is provided on the valve body (1), the pressure relief hole (59) is connected to the slow closing chamber (52), and the pressure relief hole (59) is not connected to the hydraulic space (53).

8. The micro-resistance slow closing check valve according to claim 2, characterized in that: A sealing ring (510) is arranged between the outer periphery of the piston (51) and the inner ring of the slow-closing chamber (52).

9. The micro-resistance slow closing check valve according to claim 4, characterized in that: The guide rod (55) is a hollow tube structure. A through groove is provided on the side wall of the guide rod (55). The upstream pipeline is connected to the hydraulic space (53) and the guide groove through the first water pipe (511), the through groove, and the inner ring of the hollow tube body.

10. The micro-resistance slow closing check valve according to claim 4, characterized in that: The guide head (56) is a polygonal structure, and the inner circle of the guide groove is adapted to the outer contour of the guide head (56).

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