An integrated flat-seal tubular check valve

Abstract

The present invention discloses an integrated flat sealed tubular one-way valve, comprising a valve seat, a first sealing component, a second sealing component, a valve core and a sealing adjustment mechanism; a first valve cavity is arranged in the valve seat; the first sealing component and the second sealing component are arranged at both ends of the valve seat, and a second valve cavity is formed between the valve core and the valve cavity; the sealing adjustment mechanism comprises a shift fork, an elastic telescopic rod, an extrusion track, an adjusting screw and a limit slider, the shift fork comprises a first connecting arm and a fork arm, the shift fork is rotatably arranged on the valve seat, the fork arm is movably hinged with the valve core, the elastic telescopic rod is slidably inserted on the first connecting arm, the extrusion track is arranged on the valve seat, the limit slider is slidably arranged on the extrusion track, the adjusting screw is rotatably arranged on the extrusion track, the limit slider is threadedly sleeved on the adjusting screw, and the elastic telescopic rod movably penetrates the limit slider and movably abuts against the extrusion track; the present invention reduces the processing size requirements of the valve core and the valve seat, reduces the processing cost, and is convenient for detecting and measuring the processing effects of the valve core and the sealing component.

Description

Technical Field

[0001] The invention relates to the technical field of one-way valves, and in particular to an integrated plane sealing tube type one-way valve. Background Art

[0002] Tubular check valves are widely used in fluid systems. Currently, there are two types of tubular check valves: split and integrated. The internal sealing mechanism mainly includes ball seal, cone hard seal and cone soft seal.

[0003] Compared with the split-type tubular check valve, the integrated tubular check valve will not loosen between the valve bodies during use, and is safer and more reliable.

[0004] In the sealing mechanism, both the ball seal and the conical hard seal form a seal through the hard contact between the valve core and the valve seat. The sealing specific pressure is large, but the processing accuracy requirements for the valve seat are high, and it is difficult for ordinary equipment to meet these requirements; the conical soft seal adds a soft sealing groove in the middle position of the outer conical surface of the metal valve core, and the outer conical surface of the valve core fits the inner conical surface of the valve seat. The soft seal forms a seal between the valve core and the valve seat. This sealing structure is easier to process than the hard sealing structure, but the processing of the valve seat is still carried out inside the valve seat. There is still a certain degree of difficulty in processing, and the processing effect is difficult to detect and measure.

[0005] Therefore, there is an urgent need to provide a tubular one-way valve that can reduce the difficulty of processing and facilitate the detection and measurement of processing effects. Summary of the invention

[0006] The object of the present invention is to overcome the above-mentioned disadvantages and provide an integrated flat sealing tube type one-way valve.

[0007] To achieve the above object, the specific scheme of the present invention is as follows:

[0008] An integrated plane-sealed tubular one-way valve comprises a valve seat, a first sealing component, a second sealing component, a valve core and a sealing adjustment mechanism;

[0009] The valve seat is provided with a first valve cavity and a first through hole along its axial direction; the first sealing component is provided at one end of the first through hole; the second sealing component is provided at the other end of the first through hole, and the first sealing component and the second sealing component are both provided with a second through hole communicating with the first valve cavity; the valve core is provided in the valve cavity, and a second valve cavity is formed between the valve core and the cavity wall of the valve cavity; the sealing adjustment mechanism includes a shift fork, an elastic telescopic rod, an extrusion track, an adjustment screw, and a limit slider, the shift fork has a first connecting arm and two fork arms, and the shift fork corresponds to the valve core The position of the valve seat is rotatably connected to the valve seat, the ends of the two fork arms are movably hinged to the two sides of the valve core respectively, one end of the elastic telescopic rod is slidably plugged into the first connecting arm, the extrusion track is fixedly connected to the valve seat and is located directly above the shift fork, the limit slider is slidably connected to the bottom of the extrusion track, the adjusting screw is rotatably connected to one end of the extrusion track, the limit slider is also threadedly sleeved on the adjusting screw, a limit hole is provided on the limit slider, and the other end of the elastic telescopic rod movably passes through the limit hole and movably abuts against the bottom wall of the extrusion track;

[0010] Wherein, under the push of the shift fork, the end face of the valve core can be sealed and matched with the end face of the first sealing component or the second sealing component, so that the corresponding second through hole is disconnected from the second valve cavity.

[0011] The present invention further comprises a resilient telescopic rod comprising a rod body, a spring and a ball wheel, the first connecting arm being provided with a receiving hole, the spring being arranged in the receiving hole, one end of the rod body being movably extended into the receiving hole and abutting against the spring, the other end of the rod body being movably passed through the limiting hole, the ball wheel being embedded in the other end of the rod body and being movably abutting against the bottom wall of the extrusion track under the elastic force of the spring.

[0012] Furthermore, in the present invention, an extrusion groove is provided at the bottom of the extrusion track, and part of the ball wheel is embedded in the extrusion groove.

[0013] Furthermore, in the present invention, the first connecting arm is provided with a first strip hole along its length direction, and the outer wall of the rod body is protruded with a bayonet pin, which is movably embedded in the first strip hole.

[0014] Furthermore, in the present invention, two guide rods arranged at intervals are provided at the bottom of the extrusion track, and the limit slider is slidably sleeved on the two guide rods.

[0015] The present invention further comprises: the shift fork also has a second connecting arm, a receiving groove is recessed on the valve seat, two ends of the second connecting arm are rotatably connected to the groove walls on both sides of the receiving groove, the two fork arms are respectively connected to the two ends of the second connecting arm, the first connecting arm is fixedly connected to the middle part of the second connecting arm, and both ends of the second connecting arm are provided with sealing rings on both sides of the fork arm.

[0016] The present invention further provides that the first sealing assembly and the second sealing assembly both include a sealing seat and a sealing ring, the sealing seat is provided with a second through hole, the sealing seat is arranged in the first through hole, and the sealing ring is fixedly sleeved on the end face of the inner end of the sealing seat.

[0017] Furthermore, in the present invention, first grooves are uniformly distributed on the end surface of the sealing ring in the circumferential direction.

[0018] The present invention further provides that the first sealing assembly and the second sealing assembly both include a sealing gasket ring coaxially arranged with the sealing ring, the sealing gasket ring is fixed on the cavity wall of the first valve cavity, and the inner diameter of the sealing gasket ring is greater than the outer diameter of the sealing ring.

[0019] Furthermore, in the present invention, the length of the sealing ring extending into the first valve cavity is greater than the length of the sealing gasket ring extending into the first valve cavity.

[0020] The beneficial effects of the present invention are as follows: 1. The present invention drives the limit slider to slide through the adjusting screw rod, pushes the elastic telescopic rod to swing, so that the elastic telescopic rod generates a component force in the horizontal direction, thereby driving the end face of the valve core to slide to the end face sealing cooperation with the first sealing component or the second sealing component through the fork, forming a one-way sealing pair, so that the conduction direction can be controlled by adjusting the sliding direction of the limit slider, and the structure is more flexible to use. At the same time, the end face of the valve core is sealed with the end face of the first sealing component or the second sealing component to reduce the processing size requirements of the valve core and the valve seat, which is beneficial to improve the yield rate, reduce the processing cost, and also facilitate the detection and measurement of the processing effect of the valve core and the sealing component.

[0021] 2. The present invention drives the elastic telescopic rod to swing by means of a limit slider, so that the opening pressure of the one-way sealing pair can be adjusted by adjusting the swing amplitude of the elastic telescopic rod, and the structure is more flexible to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the present invention;

[0023] Figure 2 It is a structural schematic diagram of another perspective of the present invention;

[0024] Figure 3 It is a cross-sectional schematic diagram of the present invention when the valve core is not in sealing cooperation with the first sealing component or the second sealing component;

[0025] Figure 4 It is another cross-sectional schematic diagram of the present invention when the valve core is not in sealing cooperation with the first sealing component or the second sealing component;

[0026] Figure 5 is a cross-sectional view of the present invention when the valve core and the first sealing component are in sealing cooperation;

[0027] Figure 6 is a three-dimensional diagram of the sealing adjustment mechanism of the present invention;

[0028] Figure 7 is a cross-sectional schematic diagram of the first sealing assembly or the second sealing assembly of the present invention;

[0029] Figure 8 is a schematic structural diagram of the first sealing assembly or the second sealing assembly of the present invention;

[0030] Description of reference numerals: 1. valve seat; 2. first sealing assembly; 3. second sealing assembly; 4. valve core; 5. sealing adjustment mechanism; 51. shift fork; 511. first connecting arm; 512. fork arm; 513. second connecting arm; 52. elastic telescopic rod; 521. rod body; 522. spring; 523. ball wheel; 53. extrusion track; 531. guide rod; 54. adjusting screw; 55. limit slider; 56. sealing retaining ring;

[0031] 10. Sealing seat; 20. Sealing ring; 30. Sealing gasket ring; 40. Magnetic ring; 401. Second groove;

[0032] 100. Second valve chamber. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present invention is not limited thereto.

[0034] like Figures 1 to 8 As shown, the one-piece planar sealing tubular one-way valve described in this embodiment includes a valve seat 1, a first sealing component 2, a second sealing component 3, a valve core 4 and a sealing adjustment mechanism 5;

[0035] The valve seat 1 is provided with a first valve cavity and a first through hole along its axial direction; the first sealing component 2 is provided at one end of the first through hole; the second sealing component 3 is provided at the other end of the first through hole, and the first sealing component 2 and the second sealing component 3 are both provided with a second through hole communicating with the first valve cavity; the valve core 4 is provided in the valve cavity, and a second valve cavity 100 is formed between the valve core 4 and the cavity wall of the valve cavity; the sealing adjustment mechanism 5 includes a shift fork 51, an elastic telescopic rod 52, an extrusion track 53, an adjustment screw 54, and a limit slider 55, the shift fork 51 has a first connecting arm 511 and two fork arms 512, and the shift fork 51 corresponds to the valve core 4 The position is rotatably connected to the valve seat 1, the ends of the two fork arms 512 are respectively movably hinged to the two sides of the valve core 4, one end of the elastic telescopic rod 52 is slidably inserted into the first connecting arm 511, the extrusion track 53 is fixedly connected to the valve seat 1 and is located directly above the fork 51, the limit slider 55 is slidably connected to the bottom of the extrusion track 53, the adjusting screw 54 is rotatably connected to one end of the extrusion track 53, the limit slider 55 is also threadedly sleeved on the adjusting screw 54, and a limit hole is provided on the limit slider 55, and the other end of the elastic telescopic rod 52 movably passes through the limit hole and movably abuts against the bottom wall of the extrusion track 53;

[0036] Wherein, under the push of the shift fork 51, the end face of the valve core 4 can be sealed with the end face of the first sealing component 2 or the second sealing component 3, so that the corresponding second through hole is disconnected from the second valve cavity 100. Specifically, when the end face of the valve core 4 is not sealed with the first sealing component 2 and the second sealing component 3, the second through hole of the first sealing component 2 is connected with the second through hole of the second sealing component 3 through the second valve cavity 100;

[0037] In actual use, the limit slider 55 is slid by rotating the adjusting screw 54. In this embodiment, the limit slider 55 is slid toward the second sealing component 3 as an example. The limit slider 55 pushes the elastic telescopic rod 52 to swing through the limit hole. The telescopic rod drives the fork 51 to swing through the first connecting arm 511. The first connecting arm 511 drives the two fork arms 512 to swing at the same time. Since there is a certain angle between the elastic telescopic rod 52 and the axis of the valve seat 1, the elastic force of the elastic telescopic rod 52 has a component force in the horizontal direction. This component force makes the two fork arms 512 swing at the same time. 12 drives the valve core 4 to slide in the first valve cavity toward the direction of the first sealing component 2 until the end face of the valve core 4 is sealed with the end face of the first sealing component 2, forming a profile one-way sealing pair; when the circulating medium enters the second through hole of the first sealing component 2, the pressure of the circulating medium pushes the valve core 4 to overcome the component force in the horizontal direction applied by the elastic telescopic rod 52 and slide toward the direction of the second sealing component 3, that is, the one-way sealing pair is opened, and the circulating medium enters the second valve cavity 100 through the second through hole, and then flows out from the second through hole of the second sealing component 3, realizing positive circulation;

[0038] When the circulating medium enters from the second through hole of the second sealing component 3, the circulating medium enters the second valve cavity 100 through the second through hole of the second sealing component 3. At this time, the circulating medium exerts pressure on the valve core 4 toward the first sealing component 2, so that the positive pressure between the valve core 4 and the first sealing component 2 is further increased, and the one-way sealing pair is kept in a closed state, that is, the passage of the circulating medium is closed, and reverse cutoff is achieved;

[0039] When the conduction direction needs to be changed, the limiting slider 55 is driven to move toward the direction of the first sealing component 2 by rotating the adjusting screw 54, so that the valve core 4 slides in the opposite direction to seal with the end face of the second sealing component 3, forming a one-way sealing pair with the opposite opening direction; at the same time, the limiting slider 55 is driven by the adjusting screw 54 to adjust the swing amplitude of the elastic telescopic rod 52, thereby adjusting the component force of the elastic telescopic rod 52 in the horizontal direction, thereby adjusting the opening pressure of the one-way sealing pair, and enhancing the flexibility of the one-way valve.

[0040] In this embodiment, the limiting slider 55 is driven to slide by adjusting the screw 54, and the elastic telescopic rod 52 is pushed to swing, so that the elastic telescopic rod 52 generates a component force in the horizontal direction, thereby driving the end face of the valve core 4 to slide to the end face sealing cooperation with the first sealing component 2 or the second sealing component 3 through the fork, forming a one-way sealing pair, so that the conduction direction can be controlled by adjusting the sliding direction of the limiting slider 55, and the structure is more flexible to use. At the same time, the end face of the valve core 4 is sealed with the end face of the first sealing component 2 or the second sealing component 3, which reduces the processing size requirements of the valve core 4 and the valve seat 1, which is beneficial to improve the yield rate, reduce the processing cost, and also facilitate the detection and measurement of the processing effect of the valve core 4 and the sealing component.

[0041] In addition, in this embodiment, the limit slider 55 drives the elastic telescopic rod 52 to swing, so that the opening pressure of the one-way sealing pair can be adjusted by adjusting the swing amplitude of the elastic telescopic rod 52, and the structure is more flexible to use.

[0042] like Figures 1 to 6 As shown, based on the above embodiment, further, the elastic telescopic rod 52 includes a rod body 521, a spring 522 and a ball wheel 523, the first connecting arm 511 is provided with a receiving hole, the spring 522 is arranged in the receiving hole, one end of the rod body 521 movably extends into the receiving hole and abuts against the spring 522, the other end of the rod body 521 movably passes through the limiting hole, the ball wheel 523 is embedded in the other end of the rod body 521 and movably abuts against the bottom wall of the extrusion track 53 under the elastic force of the spring 522.

[0043] Specifically, when the position of the limiting slider 55 is at the center, the rod body 521 is pressed into the accommodating hole by the extrusion track 53, so that the compression amount of the spring 522 is maximized. As the limiting slider 55 slides toward the direction of the first sealing component 2 or the second sealing component 3, the limiting slider 55 pushes the rod body 521 to deflect, and the rod body 521 drives the ball wheel 523 to move. The ball wheel 523 contacts the extrusion track 53, thereby reducing the friction between the rod body 521 and the extrusion track 53, and the rod body 521 swings more smoothly. The rod body 521 drives the spring 522 to deflect, and the spring 522 applies elastic force to the rod body 521 so that the rod body 521 is It should be extended to adapt to the deflection of the rod body 521, so that the elastic force of the spring 522 generates a component force in the horizontal direction, thereby driving the valve core 4 to slide through the fork 51 to form a one-way sealing pair, so that the valve core 4 is kept in a sealed matching state with the end face of the first sealing component 2 or the second sealing component 3 under the elastic force of the spring 522. When the circulating medium flows in the forward direction, the elastic force of the spring 522 is overcome to achieve forward conduction; when the circulating medium flows in the reverse direction, the pressure generated by the circulating medium is the same as the component force of the spring 522 in the horizontal direction, so that the valve core 4 maintains a sealed matching state, thereby achieving reverse cutoff.

[0044] like Figures 3 to 5 As shown, based on the above embodiment, further, an extrusion groove is provided at the bottom of the extrusion track 53, and part of the ball wheel 523 is embedded in the extrusion groove. In this embodiment, the ball wheel 523 is guided and limited by the extrusion groove, so that the swing of the rod body 521 is more stable, the sliding of the valve core 4 is more stable, and the sealing effect is further ensured.

[0045] Based on the above embodiment, further, the first connecting arm 511 is provided with a first strip hole along its length direction, and a bayonet is protruding from the outer wall of the rod body 521, and the bayonet is movably embedded in the first strip hole. In this embodiment, the telescopic stroke of the rod body 521 is limited by providing the first strip hole and cooperating with the bayonet, and the structure is more reliable.

[0046] like Figures 1 to 4 , Figure 6 As shown, based on the above embodiment, further, two guide rods 531 are provided at the bottom of the extrusion track 53, and the limit slider 55 is slidably sleeved on the two guide rods 531. In this embodiment, two guide rods 531 are provided to provide guide limit for the limit slider 55, so that the sliding of the limit slider 55 is more stable and reliable.

[0047] like Figure 4 and Figure 6As shown, based on the above embodiment, further, the shift fork 51 also has a second connecting arm 513, a receiving groove is concavely provided on the valve seat 1, the two ends of the second connecting arm 513 are rotatably connected to the groove walls on both sides of the receiving groove, the two fork arms 512 are respectively connected to the two ends of the second connecting arm 513, the first connecting arm 511 is fixedly connected to the middle of the second connecting arm 513, and the two ends of the second connecting arm 513 are sleeved with sealing rings 56 on both sides of the fork arm 512. In this embodiment, the linkage between the first connecting arm 511 and the two fork arms 512 is realized through the second connecting arm 513, so as to push the valve core 4 to move, and the sealing rings 56 are provided at both ends of the second connecting arm 513 to ensure the sealing of the second valve chamber 100, and the structure is more reliable. Specifically, a second strip hole is opened on the two fork arms 512, and a pin shaft is protruded on the side wall of the valve core 4. The pin shaft is movably embedded in the second strip hole, so that the second strip hole cooperates with the pin shaft to realize the movable hinge between the fork arm 512 and the valve core 4 to adapt to the sliding and pulling-out deflection of the valve core 4.

[0048] like Figures 1 to 3 , Figure 4 , Figure 7 and Figure 8 As shown, based on the above embodiment, further, the present invention further, the first sealing assembly 2 and the second sealing assembly 3 both include a sealing seat 10 and a sealing ring 20, the sealing seat 10 is provided with a second through hole, the sealing seat 10 is arranged in the first through hole, and the sealing ring 20 is fixedly sleeved on the end surface of the inner end of the sealing seat 10. In actual use, the valve core 4 contacts the end surface of the sealing ring 20 and seals and cooperates, thereby achieving the blocking of the second through hole.

[0049] Based on the above embodiment, the first grooves are evenly distributed along the circumferential direction on the end surface of the sealing ring 20. Specifically, when the one-way sealing pair is flowing in the forward direction, the valve core 4 opens under the pressure of the circulating medium. At this time, when the sealing ring 20 has not completely restored its deformation, the circulating medium can enter the second valve cavity 100 through the first groove on the end surface of the sealing ring 20, which improves the opening and closing responsiveness of the one-way valve compared to the traditional simple planar structure.

[0050] like Figures 1 to 3 , Figure 4 , Figure 7 and Figure 8As shown, based on the above embodiment, further, the first sealing assembly 2 and the second sealing assembly 3 both include a sealing gasket ring 30 coaxially arranged with the sealing ring 20, the sealing gasket ring 30 is fixed on the cavity wall of the first valve cavity, and the inner diameter of the sealing gasket ring 30 is greater than the outer diameter of the sealing ring 20. Specifically, when the one-way sealing pair is reversely cut off, the pressure of the valve core 4 on the sealing ring 20 increases, thereby increasing the deformation of the sealing ring 20. In this way, by arranging a sealing gasket on the cavity wall of the first valve cavity, on the one hand, the stroke of the valve core 4 squeezing the sealing ring 20 can be limited, avoiding the reduction of the service life of the sealing ring 20 due to excessive deformation. At the same time, the contact between the sealing gasket and the valve core 4 forms a secondary seal, which improves the sealing reliability under the reverse cut-off high-pressure state.

[0051] Based on the above embodiment, further, the length of the sealing ring 20 extending into the first valve cavity is greater than the length of the sealing gasket ring 30 extending into the first valve cavity. In this way, the valve core 4 can first contact and seal with the sealing ring 20 to ensure the sealing of the second through hole.

[0052] Based on the above embodiment, further, a magnetic ring 40 is embedded on the end surface of the outer end of the sealing seat 10. In this embodiment, the inner end surface of the magnetic ring 40 is uniformly distributed with second grooves 401 along the circumferential direction. In this embodiment, the magnetic ring 40 is provided to magnetically adsorb metal debris in the circulating medium, and the second groove 401 is used to accommodate the adsorbed metal debris, thereby avoiding the presence of metal debris in the circulating medium to affect the sealing performance of the one-way sealing pair, and the sealing effect is further improved.

[0053] The above is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. An integrated flat sealing tube type one-way valve, characterized in that: It comprises a valve seat (1), a first sealing component (2), a second sealing component (3), a valve core (4) and a sealing adjustment mechanism (5); The valve seat (1) is provided with a first valve cavity and a first through hole along its axial direction; The first sealing component (2) is arranged at one end of the first through hole; The second sealing component (3) is arranged at the other end of the first through hole, and the first sealing component (2) and the second sealing component (3) are both provided with a second through hole communicating with the first valve cavity; The valve core (4) is arranged in the valve cavity, and a second valve cavity (100) is formed between the valve core (4) and the cavity wall of the valve cavity; The sealing adjustment mechanism (5) comprises a shift fork (51), an elastic telescopic rod (52), an extrusion track (53), an adjustment screw (54), and a limit slider (55); the shift fork (51) comprises a first connecting arm (511) and two fork arms (512); the shift fork (51) is rotatably connected to the valve seat (1) corresponding to the position of the valve core (4); the ends of the two fork arms (512) are respectively movably hinged to the two sides of the valve core (4); one end of the elastic telescopic rod (52) is slidably plugged into the first connecting arm (511) ), the extrusion track (53) is fixedly connected to the valve seat (1) and is located directly above the shift fork (51), the limit slider (55) is slidably connected to the bottom of the extrusion track (53), the adjusting screw (54) is rotatably connected to one end of the extrusion track (53), the limit slider (55) is also threadedly sleeved on the adjusting screw (54), a limit hole is provided on the limit slider (55), and the other end of the elastic telescopic rod (52) movably passes through the limit hole and movably abuts against the bottom wall of the extrusion track (53); Wherein, under the push of the shift fork (51), the end face of the valve core (4) can be sealed and matched with the end face of the first sealing component (2) or the second sealing component (3), so that the corresponding second through hole is disconnected from the second valve cavity (100).

2. The one-piece flat sealing tube-type one-way valve according to claim 1, characterized in that: The elastic telescopic rod (52) comprises a rod body (521), a spring (522) and a ball wheel (523); the first connecting arm (511) is provided with a receiving hole; the spring (522) is arranged in the receiving hole; one end of the rod body (521) movably extends into the receiving hole and abuts against the spring (522); the other end of the rod body (521) movably passes through the limiting hole; the ball wheel (523) is embedded in the other end of the rod body (521) and movably abuts against the bottom wall of the extrusion track (53) under the elastic force of the spring (522).

3. The one-piece flat sealing tube-type one-way valve according to claim 2, characterized in that: An extrusion groove is provided at the bottom of the extrusion track (53), and a portion of the ball wheel (523) is embedded in the extrusion groove.

4. The one-piece flat sealing tube-type one-way valve according to claim 2, characterized in that: The first connecting arm (511) is provided with a first strip-shaped hole along its length direction, and the outer wall of the rod body (521) is provided with a bayonet protruding therefrom, and the bayonet is movably embedded in the first strip-shaped hole.

5. The one-piece flat sealing tube-type one-way valve according to claim 1, characterized in that: The bottom of the extrusion track (53) is provided with two guide rods (531) arranged at intervals, and the limiting slider (55) is slidably sleeved on the two guide rods (531).

6. The one-piece flat sealing tube-type one-way valve according to claim 1, characterized in that: The shift fork (51) also has a second connecting arm (513), a receiving groove is recessed on the valve seat (1), two ends of the second connecting arm (513) are rotatably connected to the groove walls on both sides of the receiving groove, the two fork arms (512) are respectively connected to the two ends of the second connecting arm (513), the first connecting arm (511) is fixedly connected to the middle part of the second connecting arm (513), and both ends of the second connecting arm (513) are sleeved with sealing rings (56) on both sides of the fork arm (512).

7. The one-piece flat sealing tube-type one-way valve according to claim 1, characterized in that: The first sealing assembly (2) and the second sealing assembly (3) both comprise a sealing seat (10) and a sealing ring (20); the sealing seat (10) is provided with a second through hole; the sealing seat (10) is arranged in the first through hole; and the sealing ring (20) is fixedly sleeved on the end face of the inner end of the sealing seat (10).

8. The one-piece flat sealing tube-type one-way valve according to claim 7, characterized in that: The end surface of the sealing ring (20) is uniformly provided with first grooves in the circumferential direction.

9. The one-piece flat sealing tube-type one-way valve according to claim 7, characterized in that: The first sealing assembly (2) and the second sealing assembly (3) both include a sealing gasket ring (30) coaxially arranged with the sealing ring (20); the sealing gasket ring (30) is fixed on the cavity wall of the first valve cavity; the inner diameter of the sealing gasket ring (30) is greater than the outer diameter of the sealing ring (20).

10. The one-piece flat sealing tube-type one-way valve according to claim 7, characterized in that: The length of the sealing ring (20) extending into the first valve cavity is greater than the length of the sealing gasket ring (30) extending into the first valve cavity.

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