CN115899328A - Check valve - Google Patents

Abstract

The invention belongs to the technical field of valves, and discloses a check valve which comprises a valve body, wherein an inlet and an outlet are formed in the valve body, a rotating seat and a valve core are arranged in the valve body, a sliding rod is slidably arranged on the rotating seat in a penetrating manner, one end of the sliding rod is elastically connected with the valve core, and the other end of the sliding rod is fixedly connected with a control pin; a limiting track is fixedly arranged in the valve body, and the control pin is arranged in the limiting track in a sliding manner; the valve body is rotatably provided with a swing rod, the valve body is provided with a driving device for controlling the swing rod to swing, the swing rod is provided with a sliding hole for the control pin to pass through, the control pin is driven to slide in the sliding hole along the length direction of the swing rod while the swing rod rotates, and the control pin is driven to slide in the limiting track; one end of a first track of the limiting track is communicated with one end of the middle track, and the other end of the middle track is communicated with one end of a second track; by adopting the invention, the switching of the non-return direction of the valve body and the function of allowing a large-flow medium to pass through the valve body with smaller pressure drop are realized.

Description

Check valve

Technical Field

The invention belongs to the technical field of valves, and particularly relates to a check valve.

Background

The check valve is a valve commonly used in a piping system for connecting and checking a fluid medium in the piping system, and the existing check valve mainly includes: valve body, disk seat, valve clack and valve gap flow through the medium itself in the valve body of flowing through and automatically push open, close the valve clack, and then prevent the medium refluence, because the simple structure of check valve, the working effect is obvious for the check valve has obtained the wide use, and current check valve still has following not enoughly when using:

1. when an existing pipeline system works, certain requirements are placed on the opening pressure of a check valve, however, due to the structural characteristics of the check valve, the opening pressure of the check valve is difficult to adjust, and even the check valve needs to be disassembled and a spring needs to be replaced again to achieve the purpose, so that the operation process is complex and tedious;

2. the existing check valve can only perform check operation on media in one direction, and when the media flowing in two directions need to be provided with a check function in a pipeline, the check valve needs to be disassembled and then the direction is turned to be reinstalled, however, when the media in the pipeline need to change the flow direction frequently, the operation is very troublesome, and a large amount of manpower is consumed;

3. when the existing pipeline system works, when low-pressure large-flow transportation media are needed, large pressure drop cannot occur in the pipeline, meanwhile, when small-flow transportation media are needed, the check valve in the pipeline is needed to provide a check effect for the media, but when a large amount of media flow through the check valve, pressure drop cannot be generated, and therefore the existing check valve cannot complete the working conditions.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a check valve which comprises a valve body, wherein an inlet and an outlet are formed in the valve body, a rotating seat and a valve core are arranged in the valve body, a sliding rod is slidably arranged on the rotating seat in a penetrating manner, one end of the sliding rod is elastically connected with the valve core, and the other end of the sliding rod is fixedly connected with a control pin; a limiting track is fixedly arranged in the valve body, and the control pin is arranged in the limiting track in a sliding manner; the valve body is rotatably provided with a swing rod, the valve body is provided with a driving device for controlling the swing rod to swing, the swing rod is provided with a sliding hole for the control pin to pass through, the control pin is driven to slide in the sliding hole along the length direction of the swing rod while the swing rod rotates, and the control pin is driven to slide in the limiting track;

the limiting rail comprises a first rail, a middle rail and a second rail, one end of the first rail is communicated with one end of the middle rail, and the other end of the middle rail is communicated with one end of the second rail; when the control pin slides in the first track in a reciprocating manner, the valve core is covered at the inlet, the sliding rod slides on the rotating seat to control the opening pressure of the valve core at the inlet, and when the control pin slides in the middle track in a reciprocating manner, the sliding rod rotates around the axis of the rotating seat and drives the valve core to move between the inlet and the outlet to open the inlet and the outlet; when the control pin slides in a reciprocating mode on the second rail, the valve core covers the outlet, and the sliding rod slides on the rotating seat to control the opening pressure of the valve core on the outlet.

Optionally, the driving device comprises a rotating shaft, a gear, a rack and a sliding assembly, the sliding assembly is slidably arranged on the valve body, the sliding assembly is fixedly connected with the rack, the gear is coaxially and fixedly mounted at one end of the rotating shaft, the rack is meshed with the gear, the other end of the rotating shaft extends into the valve body and is fixedly connected with the oscillating rod, and the oscillating rod is driven to oscillate by controlling the sliding assembly to slide on the valve body to drive the rotating shaft to rotate; the valve body is provided with a locking device for locking the position of the sliding component.

Optionally, the sliding assembly comprises a sliding tube and a screw rod, the screw rod is arranged in the sliding tube in a penetrating mode and is in threaded connection with the sliding tube, the sliding tube is arranged in the sliding channel of the valve body in a sliding mode, and one end of the screw rod is fixedly connected with one end of the rack.

Optionally, the outer wall of the sliding tube is provided with a plurality of positioning grooves at intervals in the axial direction, the locking device comprises an elastic locking pin which is matched and clamped with the positioning grooves, a handle is arranged at one end of the elastic locking pin, the elastic locking pin is clamped into the positioning grooves to lock the sliding tube in a natural state, and the handle is pulled outwards to enable the elastic locking pin to be separated from the positioning grooves so as to unlock the sliding tube.

Optionally, a circumferential limiting key is fixedly arranged in the sliding channel, a limiting groove for the circumferential limiting key to slide and be embedded into is axially formed in the outer wall of the sliding tube, and the circumferential limiting key axially slides in the limiting groove to limit the sliding tube to rotate.

Optionally, a first sliding track of the control pin on the first track coincides with the axis of the inlet, a second sliding track of the control pin on the second track coincides with the axis of the outlet, and the first sliding track and the second sliding track are perpendicular.

Optionally, one end of the intermediate rail communicates with an end of the first rail remote from the inlet, and the other end of the intermediate rail communicates with an end of the second rail remote from the outlet.

Optionally, the sliding trajectory of the control pin in the intermediate track is a concave arc away from the inlet and the outlet.

Optionally, the valve body is formed by splicing a first shell and a second shell, the first shell is provided with an inlet and an outlet, and the second shell is provided with a rotating seat, a limiting track and a driving device.

Optionally, the valve core comprises a valve plate and a mounting cylinder, the valve plate is fixedly arranged at one end of the mounting cylinder, a mounting opening is formed in the other end of the mounting cylinder, a sliding plate is arranged at one end of a sliding rod, the sliding plate penetrates through the mounting opening and is arranged in the mounting cylinder in a sliding manner, a first spring is arranged in a cavity defined by the sliding plate and the mounting cylinder, one end of the first spring is abutted against the sliding plate, and the other end of the first spring is abutted against the bottom wall of the mounting cylinder; and a limiting plate for limiting the sliding plate to be separated is arranged on the mounting opening of the mounting cylinder.

The check valve has the following beneficial technical effects:

1. in the check valve, the sliding rod slides on the rotating seat, the valve core is elastically connected with the sliding rod, the rotating seat is rotatably arranged on the valve body, the sliding rod drives the rotating seat to rotate, and the valve core is further driven to rotate around the rotating seat, so that the position of the valve core is changed, the valve core can be matched with the inlet and the outlet, and the check direction of the check valve is further changed.

2. In the check valve, the valve body is provided with the limiting track, the oscillating rod is provided with the sliding hole, and the sliding rod is provided with the control pin, so that the control pin slides in the limiting track and also slides in the sliding hole, the control oscillating rod can be controlled to rotate to drive the control pin to slide along the limiting track, so that the sliding rod is driven to move, and the position of the valve core is changed.

3. In the check valve, the rack is driven to move by the sliding assembly so as to drive the gear to rotate and further drive the swinging rod to rotate, so that the position of the valve core is controlled.

4. In the check valve, the positioning groove is arranged on the sliding pipe and is matched with the locking device, so that when the check conversion and the function conversion of the valve core are required, the check valve can be quickly realized through the matching of the positioning groove and the locking device, and when the opening pressure is required to be adjusted, the check valve can be precisely adjusted by rotating the screw rod, the operation is simple, and the adjustment mode is reasonable.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view taken along line A-A of FIG. 1 in accordance with the present invention;

FIG. 3 is a cross-sectional view taken along line B-B of FIG. 2 in accordance with the present invention;

FIG. 4 is a cross-sectional view of the invention after a change in the check direction;

FIG. 5 is a cross-sectional view taken in the direction B-B of FIG. 2 with the check direction of the present invention changed;

FIG. 6 is a cross-sectional view of the present invention without the check function;

fig. 7 is a cross-sectional view in the direction of B-B in fig. 2 when the check function is not required according to the present invention.

Reference numerals: 1. a valve body; 11. an inlet; 12. an outlet; 13. a limiting track; 131. a first track; 132. a middle rail; 133. a second track; 14. a slide channel; 15. a circumferential limit key; 16. a first housing; 17. a second housing; 2. rotating the base; 3. a valve core; 31. a valve plate; 32. mounting the cylinder; 33. a first spring; 34. a limiting plate; 4. a slide bar; 41. a slide plate; 42. a control pin; 5. a swing lever; 51. a slide hole; 6. a drive device; 61. a rotating shaft; 62. a gear; 63. a rack; 64. a sliding assembly; 641. a screw; 642. a sliding tube; 6421. positioning a groove; 6422. a limiting groove; 7. a locking pin; 71. a second spring; 72. a handle.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and embodiments.

Referring to fig. 1 to 7, the present embodiment provides a check valve, which includes a valve body 1, an inlet 11 and an outlet 12 are formed on the valve body 1, a rotation seat 2 and a valve core 3 are disposed in the valve body 1, a sliding rod 4 is slidably disposed on the rotation seat 2, one end of the sliding rod 4 is elastically connected to the valve core 3, and the other end of the sliding rod 4 is fixedly connected to a control pin 42; a limiting track 13 is fixedly arranged in the valve body 1, and the control pin 42 is arranged in the limiting track 13 in a sliding manner; the valve body 1 is rotatably provided with a swing rod 5, the valve body 1 is provided with a driving device 6 for controlling the swing rod 5 to swing, the swing rod 5 is provided with a sliding hole 51 for the control pin 42 to pass through, the swing rod 5 rotates and simultaneously drives the control pin 42 to slide in the sliding hole 51 along the length direction of the swing rod 5, and simultaneously drives the control pin 42 to slide in the limit track 13; the limiting rail 13 comprises a first rail 131, a middle rail 132 and a second rail 133, one end of the first rail 131 is communicated with one end of the middle rail 132, and the other end of the middle rail 132 is communicated with one end of the second rail 133; when the control pin 42 slides in the first track 131 to and fro, the valve core 3 covers the inlet 11, the sliding rod 4 slides on the rotating seat 2 to control the opening pressure of the valve core 3 at the inlet 11, and when the control pin 42 slides in the middle track 132 to and fro, the sliding rod 4 rotates around the axis of the rotating seat 2 and drives the valve core 3 to move between the inlet 11 and the outlet 12 to open the inlet 11 and the outlet 12; when the control pin 42 slides back and forth on the second track 133, the valve core 3 covers the outlet 12, and the sliding rod 4 slides on the rotary seat 2 to control the opening pressure of the valve core 3 at the outlet 12.

Through the arrangement, the swing rod 5 is driven to rotate through the driving device 6, the swing rod 5 drives the control pin 42 to slide in the limiting track 13, the sliding rod 4 is further driven to slide on the rotating seat 2 to adjust the opening pressure of the valve core 3, meanwhile, the control pin 42 drives the sliding rod 4 to rotate on the rotating seat 2, the valve core 3 is controlled to move to cover the inlet 11 or the outlet 12, the non-return direction of the valve body 1 is changed, meanwhile, the valve core 3 can be located between the inlet 11 and the outlet 12 to open the inlet 11 and the outlet 12, large-flow media can conveniently pass through the valve body 1 through small pressure drop, the function is various, and the structure is simple.

In the check valve of the present embodiment, the driving device 6 includes a rotating shaft 61, a gear 62, a rack 63 and a sliding assembly 64, the sliding assembly 64 is slidably disposed on the valve body 1, the sliding assembly 64 is fixedly connected to the rack 63, the gear 62 is coaxially and fixedly mounted at one end of the rotating shaft 61, the rack 63 is engaged with the gear 62, the other end of the rotating shaft 61 extends into the valve body 1 and is fixedly connected to the oscillating rod 5, and the sliding assembly 64 is controlled to slide on the valve body 1 to drive the rotating shaft 61 to rotate, so as to drive the oscillating rod 5 to oscillate; the valve body 1 is provided with a locking device that locks the position of the slide assembly 64.

Through the above arrangement, the sliding assembly 64 is controlled to slide on the valve body 1 through manual control or by using a tool to drive the rack 63 and the gear 62 to be meshed for transmission, and the gear 62 drives the rotating shaft 61 to rotate, so that the position of the valve core 3 and the opening pressure are controlled, the structure is simple, the operation is convenient, the position of the sliding assembly 64 is locked through the locking device, and the position of the valve core 3 is locked.

In the check valve of the present embodiment, the sliding assembly 64 includes a sliding tube 642 and a screw 641, the screw 641 is inserted into the sliding tube 642 and is in threaded connection with the sliding tube 642, the sliding tube 642 is slidably disposed in the sliding channel 14 of the valve body 1, and one end of the screw 641 is fixedly connected with one end of the rack 63.

Through the arrangement, after the valve core 3 is fixed, when the opening pressure of the valve core 3 needs to be adjusted, the screw 641 is controlled by manual control or a tool to rotate in the sliding rod 4 so as to move up and down, the rack 63 is driven to be meshed with the gear 62 for transmission, the swinging rod 5 is driven to swing through rotation, the swinging rod 5 drives the control pin 42 to slide in the limiting track 13, the control pin 42 drives the sliding rod 4 to move relative to the valve core 3, the opening pressure of the valve core 3 is adjusted by controlling the compression amount of the first spring 33, and the adjustment precision is high.

In the check valve of this embodiment, a plurality of positioning slots 6421 are axially arranged at intervals on the outer wall of the sliding tube 642, the locking device includes an elastic locking pin 7 that is engaged with the positioning slots 6421, a handle 72 is disposed at one end of the elastic locking pin 7, in a natural state, the elastic locking pin 7 is locked in the positioning slots 6421 to lock the sliding tube 642, and the handle 72 is pulled outwards to separate the elastic locking pin 7 from the positioning slots 6421 to unlock the sliding tube 642.

With the above arrangement, the position of the slide tube 642 in the slide passage 14 is locked and unlocked by the elastic lock pin 7, so that the position of the valve core 3 is locked, and the stability of the valve core 3 is improved.

In the check valve of the present embodiment, the elastic locking pin 7 includes the second spring 71 and the locking pin 7.

In the check valve of this embodiment, a circumferential limiting key 15 is fixedly disposed in the sliding channel 14, a limiting groove 6422 for the circumferential limiting key 15 to be slidably inserted is axially formed in an outer wall of the sliding tube 642, and the circumferential limiting key 15 axially slides in the limiting groove 6422 to limit the sliding tube 642 to rotate.

Through the arrangement, the circumferential limiting key 15 is matched with the limiting groove 6422, so that the sliding tube 642 is ensured to slide in the sliding channel 14 without autorotation, and the adjusting precision of the valve core 3 is improved.

In the check valve of the present embodiment, a first sliding track of the control pin 42 on the first rail 131 coincides with the axis of the inlet 11, a second sliding track of the control pin 42 on the second rail 133 coincides with the axis of the outlet 12, and the first sliding track and the second sliding track are perpendicular to each other.

Preferably, during the sliding of the sliding rod 4 in the first track 131 to adjust the opening pressure of the valve core 3, the sliding rod 4 coincides with the axis of the inlet 11, and during the sliding of the sliding rod 4 in the second track 133 to adjust the opening pressure of the valve core 3, the sliding rod 4 coincides with the axis of the outlet 12, so that the stress is balanced, and the working stability is better.

In the check valve of the present embodiment, one end of the intermediate rail 132 communicates with one end of the first rail 131, which is away from the inlet 11, and the other end of the intermediate rail 132 communicates with one end of the second rail 133, which is away from the outlet 12.

In the check valve of the present embodiment, the sliding trajectory of the control pin 42 on the intermediate rail 132 is a concave arc away from the inlet 11 and the outlet 12.

Through the arrangement and the concave arc arrangement, the control pin 42 drives the slide rod 4 to rotate, the slide rod 4 drives the valve core 3 to be far away from the inner wall of the valve body 1, and damage caused by contact between the valve core 3 and the inner wall of the valve body 1 in the moving process is avoided.

In the check valve of the embodiment, the valve body 1 is formed by splicing a first shell 16 and a second shell 17, an inlet 11 and an outlet 12 are formed in the first shell 16, and a rotating seat 2, a limiting track 13 and a driving device 6 are installed on the second shell 17.

Through the arrangement, the first shell 16 and the second shell 17 are spliced to form the valve body 1, so that parts are convenient to disassemble and manufacture.

In the check valve of the embodiment, the valve core 3 comprises a valve plate 31 and a mounting cylinder 32, the valve plate 31 is fixedly arranged at one end of the mounting cylinder 32, the other end of the mounting cylinder 32 is provided with a mounting opening, one end of the sliding rod 4 is provided with a sliding plate 41, the sliding plate 41 passes through the mounting opening and is slidably arranged in the mounting cylinder 32, a first spring 33 is arranged in a cavity defined by the sliding plate 41 and the mounting cylinder 32, one end of the first spring 33 is abutted against the sliding plate 41, and the other end of the first spring 33 is abutted against the bottom wall of the mounting cylinder 32; a stopper plate 34 for preventing the slide plate 41 from being detached is provided at the mounting opening of the mounting tube 32.

Through the arrangement, the sliding plate 41 slides in the mounting cylinder 32, the compression amount of the first spring 33 is adjusted, the opening pressure of the valve core 3 is adjusted, the mounting is stable, and the adjustment is accurate.

The check valve of the embodiment works according to the following principle:

as shown in fig. 1, in the initial state of the present invention, when the medium in the pipeline flows in through the inlet 11, the medium pushes the valve core 3 to move upward against the first spring 33, the inlet 11 is opened, and then flows out from the outlet 12, and when the medium flows back, the medium flows in from the outlet 12, the valve core 3 is pushed by the first spring 33 to close and stop the medium, so that it cannot flow through, and thus the check function is achieved, at this time, the opening pressure of the valve core 3 is at a minimum state, when the opening pressure needs to be adjusted, the screw 641 needs to be rotated to move downward relative to the sliding tube 642, the rack 63 is pushed to move downward, due to the engagement of the rack 63 and the gear 62, the gear 62 rotates counterclockwise, and the swing rod 5 is further driven to rotate counterclockwise, due to the sliding of the control pin 42 in the sliding hole 51, and the sliding of the control pin 42 in the first track 131, so that the swing rod 5 drives the control pin 42 to slide downward along the first track 131, and further drives the slide rod 4 to slide downward, thereby compressing the first spring 33, and increasing the compression of the first spring 33 until the opening pressure of the valve core 3 is adjusted to the required value, and the start pressure adjustment is completed.

When the invention needs to change the direction of the medium check, firstly, the screw 641 is rotated to move upwards relative to the sliding tube 642, the length of the screw 641 exposed out of the sliding tube 642 returns to the initial state length, then the locking pin 7 is pulled to exit from the positioning slot 6421 by overcoming the second spring 71, then the sliding tube 642 is pulled upwards to drive the rack 63 to move upwards, the gear 62 is driven to rotate clockwise, the oscillating rod 5 is driven to rotate clockwise, the control pin 42 is driven to move upwards along the first track 131, the sliding rod 4 is pulled to slide upwards, the sliding rod 4 moves upwards to drive the valve core 3 to move upwards to separate from the inlet 11, when the control pin 42 enters the middle track 132, the sliding rod 4 and the rotating seat 2 are driven to rotate, the valve core 3 is further driven to rotate, when the control pin 42 enters the second track 133, the slide rod 4 drives the valve core 3 to face the outlet 12, when the positioning groove 6421 is aligned with the locking pin 7, the control pin 42 slides leftwards along the second track 133, so that the valve core 3 covers the outlet 12, the locking pin 7 is pushed to enter the positioning groove 6421 to be positioned under the action of the second spring 71, at the moment, when a medium in the pipeline flows in through the outlet 12, the medium overcomes the first spring 33 to push the valve core 3 to move rightwards to open the outlet 12, then the medium flows out of the inlet 11, when the medium flows backwards, the medium flows in from the inlet 11, and the valve core 3 is pushed under the action of the second spring 71 to close the stop medium, so that the medium cannot flow through; thereby realizing the non-return function and finishing the change of the non-return direction.

After the medium non-return direction is changed, if the opening pressure needs to be adjusted, the screw 641 needs to be rotated to move upward relative to the sliding tube 642, the rack 63 is pushed to move upward, the gear 62 rotates clockwise, and then the oscillating rod 5 rotates clockwise, so that the oscillating rod 5 drives the control pin 42 to slide leftward along the second track 133, and then the sliding rod 4 slides leftward, so that the first spring 33 is compressed leftward, the compression amount of the first spring 33 is increased, and the adjustment of the opening pressure in the state is finished until the opening pressure of the valve core 3 is adjusted to a required value;

when the check function is not needed, firstly, the screw 641 is adjusted to enable the length of the screw 641 exposed out of the sliding tube 642 to return to the original length, then the locking pin 7 is pulled by overcoming the second spring 71 to exit from the positioning groove 6421, then the sliding tube 642 is pushed downwards to drive the rack 63 to move downwards, the rack 63 drives the gear 62 to rotate anticlockwise and further drives the oscillating rod 5 to rotate anticlockwise, and further drives the control pin 42 to move rightwards along the second rail 133, so that the sliding rod 4 is pulled to slide rightwards, the valve core 3 is driven to move rightwards to be separated from the outlet 12, when the control pin 42 enters the middle rail 132, the sliding rod 4 drives the rotating seat 2 to rotate, and further drives the valve core 3 to rotate, when the locking pin 7 moves to be aligned with the positioning groove 6421, the control pin 42 moves to the middle position of the middle rail 132, the rotating seat 2 rotates 45 degrees, the valve core 3 rotates to the position shown in fig. 6, the inlet 11 and the outlet 12 are not blocked, then the locking pin 7 is pushed to enter the positioning groove 6421 to be positioned under the action of the second spring 71, the medium can directly flow through the valve body 1, and the pressure difference is small when the valve body 1, and the check function is completed.

Claims (10)

1. A check valve is characterized by comprising a valve body (1), wherein an inlet (11) and an outlet (12) are formed in the valve body (1), a rotating seat (2) and a valve core (3) are arranged in the valve body (1), a sliding rod (4) is slidably arranged on the rotating seat (2) in a penetrating manner, one end of the sliding rod (4) is elastically connected with the valve core (3), and the other end of the sliding rod (4) is fixedly connected with a control pin (42); a limiting track (13) is fixedly arranged in the valve body (1), and a control pin (42) is arranged in the limiting track (13) in a sliding manner; the swing rod (5) is rotationally arranged in the valve body (1), the valve body (1) is provided with a driving device (6) for controlling the swing rod (5) to swing, the swing rod (5) is provided with a sliding hole (51) for the control pin (42) to pass through, the swing rod (5) rotates and simultaneously drives the control pin (42) to slide in the sliding hole (51) along the length direction of the swing rod (5) and simultaneously drives the control pin (42) to slide in the limiting track (13);

the limiting track (13) comprises a first track (131), a middle track (132) and a second track (133), one end of the first track (131) is communicated with one end of the middle track (132), and the other end of the middle track (132) is communicated with one end of the second track (133); when the control pin (42) slides in the first track (131) in a reciprocating mode, the valve core (3) covers the inlet (11), the sliding rod (4) slides on the rotating seat (2) to control the opening pressure of the valve core (3) at the inlet (11), and when the control pin (42) slides in the middle track (132) in a reciprocating mode, the sliding rod (4) rotates around the axis of the rotating seat (2) and drives the valve core (3) to move between the inlet (11) and the outlet (12) to open the inlet (11) and the outlet (12); when the control pin (42) slides in a reciprocating mode on the second track (133), the valve core (3) covers the outlet (12), and the sliding rod (4) slides on the rotating seat (2) to control the opening pressure of the valve core (3) at the outlet (12).

2. The check valve according to claim 1, wherein the driving device (6) comprises a rotating shaft (61), a gear (62), a rack (63) and a sliding assembly (64), the sliding assembly (64) is slidably disposed on the valve body (1), the sliding assembly (64) is fixedly connected with the rack (63), the gear (62) is fixedly mounted on one end of the rotating shaft (61) coaxially, the rack (63) is engaged with the gear (62), the other end of the rotating shaft (61) extends into the valve body (1) and is fixedly connected with the oscillating rod (5), and the rotating shaft (61) is driven to rotate by controlling the sliding assembly (64) to slide on the valve body (1), so as to drive the oscillating rod (5) to oscillate; a locking device for locking the position of the sliding assembly (64) is arranged on the valve body (1).

3. The check valve according to claim 2, wherein the sliding assembly (64) comprises a sliding tube (642) and a screw (641), the screw (641) is inserted into the sliding tube (642) and is in threaded connection with the sliding tube (642), the sliding tube (642) is slidably arranged in the sliding channel (14) of the valve body (1), and one end of the screw (641) is fixedly connected with one end of the rack (63).

4. The check valve according to claim 3, characterized in that a plurality of positioning slots (6421) are axially arranged at intervals on the outer wall of the sliding tube (642), the locking device comprises an elastic locking pin (7) which is matched and clamped with the positioning slots (6421), a handle (72) is arranged at one end of the elastic locking pin (7), the elastic locking pin (7) is naturally clamped in the positioning slots (6421) to lock the sliding tube (642), and the elastic locking pin (7) is separated from the positioning slots (6421) by pulling the handle (72) outwards to unlock the sliding tube (642).

5. The check valve according to claim 3, characterized in that a circumferential limiting key (15) is fixedly arranged in the sliding channel (14), a limiting groove (6422) for the sliding insertion of the circumferential limiting key (15) is axially formed on the outer wall of the sliding tube (642), and the circumferential limiting key (15) axially slides in the limiting groove (6422) to limit the rotation of the sliding tube (642).

6. Non-return valve according to one of claims 1 to 5, characterized in that a first sliding trajectory of the control pin (42) in the first track (131) coincides with the axis of the inlet (11), a second sliding trajectory of the control pin (42) in the second track (133) coincides with the axis of the outlet (12), the first and second sliding trajectories being perpendicular.

7. The non-return valve according to claim 6, characterized in that one end of the intermediate rail (132) communicates with the end of the first rail (131) remote from the inlet (11) and the other end of the intermediate rail (132) communicates with the end of the second rail (133) remote from the outlet (12).

8. The non-return valve according to claim 7, characterized in that the sliding trajectory of the control pin (42) on the intermediate track (132) is a concave arc away from the inlet (11) and the outlet (12).

9. The non-return valve according to any one of claims 1 to 5, characterized in that the valve body (1) is composed of a first housing (16) and a second housing (17) in a split joint, the first housing (16) is provided with an inlet (11) and an outlet (12), and the second housing (17) is provided with the rotating seat (2), the limiting rail (13) and the driving device (6).

10. The check valve according to any one of claims 1 to 5, wherein the valve core (3) comprises a valve plate (31) and a mounting cylinder (32), the valve plate (31) is fixedly arranged at one end of the mounting cylinder (32), the other end of the mounting cylinder (32) is provided with a mounting opening, one end of the sliding rod (4) is provided with a sliding plate (41), the sliding plate (41) is arranged in the mounting cylinder (32) in a sliding manner through the mounting opening, the sliding plate (41) and the mounting cylinder (32) enclose a cavity in which a first spring (33) is arranged, one end of the first spring (33) is abutted against the sliding plate (41), and the other end of the first spring (33) is abutted against the bottom wall of the mounting cylinder (32); a stopper plate (34) for restricting the slide plate (41) from being detached is provided at the mounting opening of the mounting tube (32).

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