Anti-loose check valve

Abstract

The utility model discloses a kind of anti-loosening check valves, including valve body, valve stem, valve flap and pin shaft installed on valve body, the valve stem rotating sleeve is connected on the outer surface of pin shaft, the outer surface of valve stem is equipped with square groove on one side, elastic limit pin is jointly installed between valve stem and square groove, the inner side of square groove is positioned and inserted with positioning seat, and positioning seat is matched with elastic limit pin, and is fixedly connected with valve flap;The outer wall of one side of the valve body is fixedly interconnected with assembly seat, the connecting end of the assembly seat is detachably fixedly connected with maintenance cover, the maintenance cover is fixedly connected with sealing inlay block on one side of assembly seat. In the utility model, mechanical self-locking structure of elastic limit pin and positioning seat is formed Vertical clamping force when fluid reverse impact, cooperate positioning seat and square groove, significantly improve the connection reliability of valve under vibration condition, avoid the risk of valve flap falling due to loosening caused by traditional bolt connection.

Description

Technical Field

[0001] This utility model relates to the field of check valve technology, and in particular to an anti-loosening check valve. Background Technology

[0002] A check valve, also known as a non-return valve or one-way valve, uses a valve disc (disc) to stop backflow by means of water. In other words, water can only flow in one direction; the reverse direction closes the valve.

[0003] Check valves are widely used in various pipeline systems due to their reliable unidirectional flow characteristics.

[0004] Currently, the stem and disc of a swing check valve are rigidly connected by bolts and nuts, but this structure lacks an anti-loosening device. Under long-term vibration conditions, the connecting nut is prone to gradual loosening, which may lead to the failure of the connection between the stem and disc, resulting in the risk of the disc falling off and affecting the valve's sealing performance and operational reliability. Secondly, due to the small space inside the valve body, replacing the disc requires first removing the pin connecting the valve body and the stem, then taking out the stem and disc, and finally replacing the disc. After completion, all components must be reassembled, making the disassembly work cumbersome and time-consuming.

[0005] For example, the patent with prior art license publication number CN222526957U discloses a swing check valve, which has the above-mentioned problems.

[0006] Therefore, we propose an anti-loosening check valve. Utility Model Content

[0007] The purpose of this utility model is to address the shortcomings of existing technologies by proposing an anti-loosening check valve.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: an anti-loosening check valve, comprising a valve body, a valve stem, a valve disc, and a pin installed on the valve body. The valve stem is rotatably sleeved on the outer surface of the pin. A square groove is provided on one side of the outer surface of the valve stem. A spring-loaded limiting pin is installed between the valve stem and the square groove. A positioning seat is inserted into the inner side of the square groove, and the positioning seat matches the spring-loaded limiting pin and is fixedly connected to the valve disc.

[0009] An assembly base is fixedly connected to one side of the outer wall of the valve body. A maintenance cover is detachably and fixedly connected to the connecting end of the assembly base. A sealing block is fixedly connected to one side of the maintenance cover and extends through the valve body.

[0010] Furthermore, both ends of the valve body are fixedly connected with connecting flanges, and a valve seat is fixedly embedded inside the valve body at the feed port, and the valve seat matches the valve disc. The setting of connecting flanges facilitates the connection between the valve body and external pipelines.

[0011] Furthermore, the elastic limiting pin includes an L-shaped limiting rod, which extends through the outer wall of the valve stem into the square groove and is slidably connected to the valve stem. A tension spring is fixedly connected between the L-shaped limiting rod and the valve stem, and the tension spring can continuously provide limiting tension to the L-shaped limiting rod.

[0012] Furthermore, a limiting hole is provided on one side of the outer surface of the positioning seat, and the limiting hole matches the L-shaped limiting rod. The combination of the limiting hole and the L-shaped limiting rod can limit the positioning seat.

[0013] Furthermore, a rubber pad is fixedly fitted onto the outer surface of the positioning seat, and the rubber pad is fixedly connected to the valve disc and tightly abuts against the valve stem. The rubber pad can improve the tightness of the connection between the valve disc and the valve stem.

[0014] Furthermore, the outer surface of the inspection cover is provided with a plurality of bolts extending to the side of the mounting base, and the outer surface of the plurality of bolts is threaded with nuts. The arrangement of bolts and nuts facilitates the disassembly and assembly of the inspection cover and the mounting base.

[0015] Furthermore, the outer surface of the sealing insert is fitted with a sealing rubber sleeve, and the sealing rubber sleeve is fixedly connected to the valve body. The sealing rubber sleeve can ensure the sealing performance of the sealing insert after installation and prevent leakage.

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

[0017] 1. When in use, this utility model uses the mechanical self-locking structure of the elastic limiting pin and the positioning seat to form a vertical locking force when the fluid reverses. Combined with the positioning seat and the square groove, it significantly improves the connection reliability of the valve under vibration conditions and avoids the risk of valve disc falling off due to loosening in traditional bolt connections.

[0018] 2. In use, this utility model adopts a detachable design of inspection cover and sealing insert, combined with the plug-in structure of square groove and positioning seat, to realize quick disassembly and assembly of valve disc, simplify maintenance process and improve maintenance efficiency. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the drawings used in the description of the specific embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model;

[0021] Figure 2This is a side sectional view of the present invention.

[0022] Figure 3 For the present utility model Figure 2 Enlarged view of point A in the middle;

[0023] Figure 4 This is a top sectional view of the present invention.

[0024] The attached figures are labeled as follows:

[0025] 1. Valve body; 2. Connecting flange; 3. Mounting seat; 4. Bolt; 5. Inspection cover; 6. Valve stem; 7. Pin; 8. Valve disc; 9. Valve seat; 10. Square groove; 11. Limiting hole; 12. Rubber pad; 13. Positioning seat; 14. Tension spring; 15. L-shaped limiting rod; 16. Nut; 17. Sealing insert; 18. Sealing rubber sleeve. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1-4 As shown, a check valve for preventing loosening is disclosed, comprising a valve body 1, a valve stem 6, a valve disc 8, and a pin 7 mounted on the valve body 1. Both ends of the valve body 1 are fixedly connected to connecting flanges 2. A valve seat 9 is fixedly embedded inside the valve body 1 at the feed inlet, and the valve seat 9 matches the valve disc 8. The valve stem 6 is rotatably sleeved on the outer surface of the pin 7.

[0028] A square groove 10 is provided on one side of the outer surface of the valve stem 6. A spring-loaded limiting pin is installed between the valve stem 6 and the square groove 10. The spring-loaded limiting pin includes an L-shaped limiting rod 15, which extends through the outer wall of the valve stem 6 into the square groove 10 and is slidably connected to the valve stem 6. A tension spring 14 is fixedly connected between the L-shaped limiting rod 15 and the valve stem 6. The tension spring 14 is made of high-strength stainless steel spring wire (such as SUS304 or piano wire), and the initial preload is set to 5-8N to ensure its performance.

[0029] A positioning seat 13 is inserted into the inner side of the square groove 10, and the positioning seat 13 matches the elastic limit pin and is fixedly connected to the valve disc 8. A limit hole 11 is opened on one side of the outer surface of the positioning seat 13, and the limit hole 11 matches the L-shaped limit rod 15. A rubber pad 12 is fixedly sleeved on the outer surface of the positioning seat 13, and the rubber pad 12 is fixedly connected to the valve disc 8 and tightly abuts against the valve stem 6. The rubber pad 12 has a certain compression effect, so that the valve disc 8 is more tightly connected to the valve stem 6 after assembly.

[0030] A mounting base 3 is fixedly connected to one side of the outer wall of the valve body 1. A maintenance cover 5 is detachably and fixedly connected to the connecting end of the mounting base 3. A sealing insert 17 is fixedly connected to one side of the maintenance cover 5, and the sealing insert 17 penetrates into the valve body 1. Multiple bolts 4 penetrating to one side of the mounting base 3 are provided on one side of the outer surface of the maintenance cover 5. Nuts 16 are threaded onto the outer surface of each bolt 4. A sealing rubber sleeve 18 is sealed onto the outer surface of the sealing insert 17, and the sealing rubber sleeve 18 is fixedly connected to the valve body 1. The mounting base 3 serves as a maintenance channel on the valve body 1, and is integrally formed with the valve body 1 or welded for fixation. Its connecting end has bolt holes for fixing the maintenance cover 5. The inner diameter of the mounting base 3 is slightly larger than the outer diameter of the sealing insert 17 to facilitate the installation and removal of the maintenance cover 5. The nuts 16 can be lock nuts or have spring washers added to prevent loosening due to vibration.

[0031] Fluid forward flow stage:

[0032] When the medium flows in from the inlet of valve body 1, the fluid pressure pushes valve disc 8 to rotate around pin 7 to open. At this time, valve disc 8 drives valve stem 6 to rotate synchronously through positioning seat 13. L-shaped limit rod 15 is kept in the fitting state with limit hole 11 under the action of tension spring 14, ensuring that valve disc 8 and valve stem 6 are rigidly connected and achieve stable opening. The opening angle of valve disc 8 is naturally limited by the internal cavity structure of valve body 1.

[0033] Backflow prevention sealing stage:

[0034] When the medium flows in the reverse direction, the fluid pressure pushes the valve disc 8 to rotate in the reverse direction. At this time, the valve disc 8 applies radial pressure to the L-shaped limiting rod 15 through the positioning seat 13. However, due to the preload of the tension spring 14 and the perpendicular engagement between the L-shaped limiting rod 15 and the limiting hole 11, a mechanical self-locking is formed, preventing the valve disc 8 from loosening abnormally. The valve disc 8 is finally tightly pressed against the valve seat 9, achieving zero-leakage closure.

[0035] Inspection and maintenance phase:

[0036] When maintenance is required, after removing the bolts 4 and nuts 16 of the maintenance cover 5, the sealing insert 17 is pulled out along with the maintenance cover 5 as a whole, so that the side of the valve disc 8 is fully exposed.

[0037] Manually move the L-shaped limit rod 15 to overcome the tension of the tension spring 14 and release the locking of the limit hole 11. The valve disc 8, together with the positioning seat 13, can be pulled out laterally from the square groove 10 without disassembling the pin 7 or the valve stem 6.

[0038] After the maintenance is completed, the reverse operation can be performed to reset it. The sealing rubber sleeve 18 ensures the sealing of the assembly seat 3.

[0039] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A check valve for preventing loosening, comprising a valve body (1), a valve stem (6), a valve disc (8), and a pin (7) mounted on the valve body (1), characterized in that: The valve stem (6) is rotatably sleeved on the outer surface of the pin (7). A square groove (10) is provided on one side of the outer surface of the valve stem (6). A spring-loaded limiting pin is installed between the valve stem (6) and the square groove (10). A positioning seat (13) is inserted into the inner side of the square groove (10). The positioning seat (13) matches the spring-loaded limiting pin and is fixedly connected to the valve disc (8). A mounting base (3) is fixedly connected to one side of the outer wall of the valve body (1). A maintenance cover (5) is detachably fixedly connected to the connecting end of the mounting base (3). A sealing insert (17) is fixedly connected to one side of the mounting base (3), and the sealing insert (17) penetrates into the valve body (1).

2. The anti-loosening check valve according to claim 1, characterized in that: Both ends of the valve body (1) are fixedly connected to connecting flanges (2), and a valve seat (9) is fixedly embedded inside the valve body (1) at the feed port, and the valve seat (9) matches the valve disc (8).

3. The anti-loosening check valve according to claim 1, characterized in that: The elastic limiting pin includes an L-shaped limiting rod (15), which extends through the outer wall of the valve stem (6) into the square groove (10) and is slidably connected to the valve stem (6). A tension spring (14) is fixedly connected between the L-shaped limiting rod (15) and the valve stem (6).

4. The anti-loosening check valve according to claim 3, characterized in that: The positioning seat (13) has a limiting hole (11) on one side of its outer surface, and the limiting hole (11) matches the L-shaped limiting rod (15).

5. The anti-loosening check valve according to claim 1, characterized in that: A rubber pad (12) is fixedly sleeved on the outer surface of the positioning seat (13), and the rubber pad (12) is fixedly connected to the valve disc (8) and tightly abuts against the valve stem (6).

6. The anti-loosening check valve according to claim 1, characterized in that: The outer surface of the inspection cover (5) is provided with a plurality of bolts (4) that penetrate to one side of the mounting base (3), and the outer surface of the plurality of bolts (4) is threaded with nuts (16).

7. The anti-loosening check valve according to claim 1, characterized in that: The outer surface of the sealing insert (17) is fitted with a sealing rubber sleeve (18), and the sealing rubber sleeve (18) is fixedly connected to the valve body (1).

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