Check valve with adjustable threshold value

Abstract

The check valve comprises a valve body, a valve element, a valve cover, a shaft sleeve and a valve rod, the valve cover is arranged on the valve body, an inlet flow channel and an outlet flow channel are arranged in the valve body, the valve element is arranged in the valve body, the inlet flow channel and the outlet flow channel are separated by the valve element, and the shaft sleeve is arranged on the shaft sleeve. The valve rod and the shaft sleeve are arranged in the valve body, the shaft sleeve is arranged on the periphery of the valve rod in a sleeving mode, and the inner end of the valve rod is connected with the valve element. The pre-tightening device penetrates through the valve cover and acts on the outer end of the valve rod, through the arrangement, the pre-tightening device is arranged on the valve cover in a penetrating mode, pressure is adjustably applied to the valve element in a thread adjusting mode, the valve element can stably abut against the valve seat, and the abutting pressure can be adjusted; the function of adjusting the conduction threshold value of the check valve is achieved.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a check valve with adjustable threshold value. Background Art

[0002] Check valve, also known as one-way valve, is a valve installed in a fluid pipeline to prevent the reverse flow of fluid.

[0003] In the prior art, the working principle of the check valve is to block the channel by pushing the valve core to move through the reverse flow of fluid, or to block the channel by relying on the gravity of the valve core itself; however, when the pressure of the circulating medium is relatively low, either the pressure is too low to allow the medium to circulate normally, or the pressure is too low and the check sealing effect is lost, so there is room for improvement. Summary of the invention

[0004] In view of the above problems, the present application proposes a threshold-adjustable check valve, which provides a pre-tightening device through the valve cover, and can adjust the pressure on the valve core by adjusting the thread, so that the valve core can stably abut against the valve seat and the pressure can be adjusted, thereby achieving the function of adjusting the check valve conduction threshold; the threshold-adjustable check valve is specifically implemented by the following technical solutions:

[0005] A threshold adjustable check valve comprises: a valve body, a valve core, a valve cover, a shaft sleeve and a valve stem, wherein the valve cover is arranged on the valve body, the valve body is provided with an inlet flow channel and an outlet flow channel, the valve core is arranged in the valve body, and the valve core separates the inlet flow channel and the outlet flow channel, the valve stem and the shaft sleeve are arranged in the valve body, and the shaft sleeve is sleeved on the outer periphery of the valve stem, and the inner end of the valve stem is connected to the valve core; and a pre-tightening device is also included, and the pre-tightening device passes through the valve cover and acts on the outer end of the valve stem.

[0006] It is further configured that a threaded sleeve is provided at a position on the valve cover for the pre-tightening device to pass through, the pre-tightening device includes a push rod and a spring, the push rod includes a threaded portion and a tightening portion, the threaded portion is provided on the upper half of the push rod, a thread is provided on the outer periphery, and the threaded sleeve forms a threaded fit, the spring is provided between the inner end of the push rod and the outer end of the valve stem, through this configuration, the pre-tightening device can adjust the pre-tightening force of the spring by means of a threaded connection, thereby realizing the function of adjusting the threshold value of the valve.

[0007] It is further arranged that the threaded sleeve is welded to the valve cover. Through this arrangement, the stability of the entire machine is improved.

[0008] It is further provided that a limit ring is arranged between the valve cover and the shaft sleeve. When the valve cover is connected to the shaft sleeve by a fastener, a cavity is formed by clamping the limit ring. A locking ring is also arranged on the push rod. The locking ring is arranged in the cavity, and the locking ring forms a limit with the bottom surface of the valve cover and the top surface of the shaft sleeve respectively as the push rod moves. Through this arrangement, an active limit of the locking ring is arranged in the cavity to prevent the occurrence of over-tightening or over-loosening during adjustment. The overall use safety is higher and the structure is more stable.

[0009] It is further configured that a sealing groove is provided on the outer edge of the sleeve, and a first compression filler and a second compression filler are provided in the sealing groove. The first compression filler and the second compression filler are compressed to the inside of the sealing groove through the limiting ring. Through this configuration, the sealing performance of the valve is further improved and the service life is increased.

[0010] It is further configured that the inner end of the push rod and the outer end of the valve stem are both provided with a boss, the diameter of the boss is smaller than the diameter of the spring, and the two ends of the spring are limited by the boss clamping. Through this configuration, it is convenient to limit the spring, making the overall structure more stable.

[0011] It is further arranged that the inner wall where the shaft sleeve contacts the push rod is provided with only an annular groove, and a sealing ring is arranged in the annular groove. Through this arrangement, the sealing performance of the valve is further improved and the service life is increased.

[0012] It is further configured that a rotating device is provided at the outer end of the push rod, and the rotating device is configured as a circular ring that is integral with the push rod. Through this configuration, it is convenient to use a tool to pass through the circular ring for prying during the adjustment process, which is more practical and convenient.

[0013] The threshold adjustable check valve described above has a pre-tightening device penetrating through the valve cover, and can apply pressure to the valve core by adjusting the thread, so that the valve core can stably abut against the valve seat and the pressure of the abutment can be adjusted, thereby realizing the function of adjusting the conduction threshold of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 Front cross-sectional view of the threshold adjustable check valve provided in the embodiment of the present application Figure 1 ;

[0016] Figure 2 The threshold adjustable check valve provided in the embodiment of the present application Figure 1 Enlarged view of part A in the middle;

[0017] Figure 3 Front cross-sectional view of the threshold adjustable check valve provided in the embodiment of the present application Figure 2 ;

[0018] Figure 4 The threshold adjustable check valve provided in the embodiment of the present application Figure 3 Enlarged view of part B in the middle.

[0019] Among them, the reference numerals in the figure are:

[0020] 1. Valve body; 2. Valve core; 3. Valve cover; 4. Bushing; 5. Valve stem; 6. Inlet flow channel; 7. Outlet flow channel; 8. Preload device; 9. Threaded sleeve; 10. Push rod; 11. Spring; 12. Threaded part; 13. Tightening part; 14. Limiting ring; 15. Cavity; 16. Locking ring; 17. Sealing groove; 18. First compression packing; 19. Second compression packing; 20. Boss; 21. Annular groove; 22. Sealing ring; 23. Rotating device; 24. Ring. DETAILED DESCRIPTION

[0021] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0022] The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] The present application is further described with reference to the accompanying drawings and specific implementation methods:

[0024] Please also read Figures 1 to 4 A threshold adjustable check valve comprises: a valve body 1, a valve core 2, a valve cover 3, a shaft sleeve 4 and a valve stem 5, wherein the valve cover 3 is arranged on the valve body 1, an inlet flow channel 6 and an outlet flow channel 7 are arranged in the valve body 1, the valve core 2 is arranged in the valve body 1, and the valve core 2 separates the inlet flow channel 6 and the outlet flow channel 7, the valve stem 5 and the shaft sleeve 4 are arranged in the valve body 1, and the shaft sleeve 4 is sleeved on the outer periphery of the valve stem 5, and the inner end of the valve stem 5 is connected with the valve core 2; and a pre-tightening device 8 is also included, and the pre-tightening device 8 passes through the valve cover 3 and acts on the outer end of the valve stem 5.

[0025] See also Figures 1 to 4 In this embodiment, the valve cover 3 is provided with a threaded sleeve 9 at the position where the pre-tightening device 8 passes through. The pre-tightening device 8 includes a push rod 10 and a spring 11. The push rod 10 includes a threaded portion 12 and a tightening portion 13. The threaded portion 12 is provided on the upper half of the push rod 10, and a thread is provided on the outer periphery. The threaded cloth forms a threaded fit with the threaded sleeve 9. The spring 11 is provided between the inner end of the push rod 10 and the outer end of the valve stem 5. Through this arrangement, the thread precision of the threaded portion 12 and the threaded sleeve 9 directly affects the accuracy of the conduction threshold adjustment of the check valve. Therefore, it is necessary to adapt the manufacturing of the thread according to the specific use environment; the threaded sleeve 9 is welded to the valve cover 3. Threads or other methods may also be used, but the connection strength needs to be guaranteed because the main force of the pre-tightening device 8 is the threaded sleeve 9; a limit ring 14 is provided between the valve cover 3 and the shaft sleeve 4. When the valve cover 3 is connected to the shaft sleeve 4 through a fastener, a cavity 15 is formed by clamping the limit ring 14. A locking ring 16 is also provided on the push rod 10. The locking ring 16 is arranged in the cavity 15, and the locking ring 16 forms a limit with the bottom surface of the valve cover 3 and the top surface of the shaft sleeve 4 respectively as the push rod 10 moves. Through this arrangement, the locking ring 16 and the push rod 10 are an integrated structure, and the locking ring 16 is separated during the up and down movement of the push rod 10. The bottom surface of the valve cover 3 is limited upwards, and the shaft sleeve 4 is limited downwards, so as to limit the range of movement of the push rod 10 to prevent the push rod 10 from being too tight or too loose when adjusting the push rod 10; the outer edge of the shaft sleeve 4 is provided with a sealing groove 17, and a first compression packing 18 and a second compression packing 19 are provided in the sealing groove 17, and the first compression packing 18 and the second compression packing 19 are compressed with the inside of the sealing groove 17 through the limiting ring 14; the inner end of the push rod 10 and the outer end of the valve stem 5 are both provided with a boss 20, the diameter of the boss 20 is smaller than the diameter of the spring 11, and the two ends of the spring 11 are clamped and limited by the boss 20; the shaft sleeve 4 is in contact with the push rod 10 The inner wall is provided with only an annular groove 21, and a sealing ring 22 is arranged in the annular groove 21. This arrangement further improves the sealing performance and prevents leakage of the medium due to excessive pressure on the ring during use. The first compression filler 18 mainly fills the sealing groove 17, and the second compression filler 19 mainly seals and waterproofs. A rotating device 23 is arranged at the outer end of the push rod 10, and the rotating device 23 is arranged as a circular ring 24 which is integrated with the push rod 10. When the end of the circular ring 24 is arranged in this way, during the adjustment process, a long tool, such as the handle part of a screwdriver or a wrench, etc. can be easily inserted into the circular ring 24, and the lever is moved away, so that the effect of easily rotating the preload device 8 can be achieved.

[0026] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A threshold adjustable check valve, comprising: A valve body (1), a valve core (2), a valve cover (3), a shaft sleeve (4) and a valve stem (5), wherein the valve cover (3) is arranged on the valve body (1), an inlet flow channel (6) and an outlet flow channel (7) are arranged in the valve body (1), the valve core (2) is arranged in the valve body (1), and the valve core (2) separates the inlet flow channel (6) and the outlet flow channel (7), the valve stem (5) and the shaft sleeve (4) are arranged in the valve body (1), and the shaft sleeve (4) is sleeved on the outer periphery of the valve stem (5), and the inner end of the valve stem (5) is connected to the valve core (2); characterized in that: it also includes a pre-tightening device (8), and the pre-tightening device (8) passes through the valve cover (3) and acts on the outer end of the valve stem (5).

2. A threshold adjustable check valve according to claim 1, characterized in that The valve cover (3) is provided with a threaded sleeve (9) at a position for the pre-tightening device (8) to pass through. The pre-tightening device (8) comprises a push rod (10) and a spring (11). The push rod (10) comprises a threaded portion (12) and a tightening portion (13). The threaded portion (12) is provided at the upper half of the push rod (10) and has a threaded portion on the outer periphery. The threaded portion and the threaded sleeve (9) form a threaded fit. The spring (11) is provided between the inner end of the push rod (10) and the outer end of the valve stem (5).

3. A threshold adjustable check valve according to claim 2, characterized in that The threaded sleeve (9) is welded to the valve cover (3).

4. The threshold adjustable check valve according to claim 2, characterized in that A limit ring (14) is arranged between the valve cover (3) and the shaft sleeve (4); when the valve cover (3) is connected to the shaft sleeve (4) by means of a fastener, a cavity (15) is formed by clamping the limit ring (14); a locking ring (16) is also arranged on the push rod (10); the locking ring (16) is arranged in the cavity (15); and the locking ring (16) forms a limit with the bottom surface of the valve cover (3) and the top surface of the shaft sleeve (4) respectively as the push rod (10) moves.

5. The threshold adjustable check valve according to claim 4, characterized in that The outer edge of the shaft sleeve (4) is provided with a sealing groove (17), and a first compression filler (18) and a second compression filler (19) are provided in the sealing groove (17). The first compression filler (18) and the second compression filler (19) are compressed against the inside of the sealing groove (17) through the limiting ring (14).

6. The threshold adjustable check valve according to claim 2, characterized in that The inner end of the push rod (10) and the outer end of the valve stem (5) are both provided with a boss (20), the diameter of the boss (20) is smaller than the diameter of the spring (11), and the two ends of the spring (11) are clamped and limited by the boss (20).

7. The threshold adjustable check valve according to claim 1, characterized in that The inner wall of the shaft sleeve (4) in contact with the push rod (10) is provided with only an annular groove (21), and a sealing ring (22) is arranged in the annular groove (21).

8. The threshold adjustable check valve according to claim 2, characterized in that A rotating device (23) is provided at the outer end of the push rod (10), and the rotating device (23) is configured as a circular ring (24) which is integral with the push rod (10).

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