A steady-flow check structure

Abstract

The present invention provides a steady-flow check structure, in which a first limiting part close to the input end and a second limiting part far from the input end are formed in the base body; the first component is connected to the second limiting part through an elastic component and is attached to and limited by the first limiting part under the elastic force of the elastic component; the second component is sleeved outside the first component and is connected to the first component through a buckle. When fluid is input, the first component moves towards the second limiting part under the fluid pressure and slowly compresses the elastic component. When the first component and the second component are attached, the first component and the second component are repeatedly attached and separated and move slowly in the direction away from the first limiting part together until the second component is limited by the second limiting part and the output end maintains a slow output; when the fluid input stops, the elastic component bounces the first component together with the second component towards the first limiting part, the first component returns to the initial position, and the output end stops outputting, thereby achieving the effect of steady-flow output and rapid check.

Description

Technical Field

[0001] The present invention belongs to the technical field of check valves in vehicle structure technology, and specifically relates to a steady-flow check structure. Background Art

[0002] In rail vehicles, there is an air source device for generating compressed air required for the braking system and air spring system in the vehicle. The end of the air source device serves as the output end to output compressed air. During the operation of the rail vehicle, due to the large air consumption of the whole vehicle, the air compressor in the air source device needs to operate for a long time to inflate to meet the air consumption demand of the whole vehicle.

[0003] However, during the operation of the air compressor, the impact force generated by the gas flow causes the metal and vulcanized components inside the air compressor valve body to slap against each other, resulting in varying degrees of damage to the components, and accompanied by a violent abnormal noise under the working conditions. That is to say, the valve body structure in the air compressor of the air source device presents a repeated process of quickly opening to the maximum opening and then quickly closing to the minimum opening during the working process, thereby affecting the service life of the air compressor components, and the abnormal noise generated causes noise pollution to the actual working environment.

[0004] In view of this, the prior art should be improved to solve the technical problems of the too-fast opening of the air compressor valve in the existing air source device and the damage of the components caused by the valve slapping. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a steady-flow check structure that can achieve slow and stable output of fluid, especially stable air pressure output and quick closing in the air compressor of the air source device, and can reduce the damage and abnormal noise caused by repeated opening and closing between the components in the air compressor valve body, and extend the service life of the equipment.

[0006] To solve the above technical problems, a steady-flow check structure adopted by the present invention includes at least one input end and at least one output end. The steady-flow check structure includes: a base body, in which a first limiting part close to the input end and a second limiting part far from the input end are formed along the fluid flow direction; a first component, which is connected to the second limiting part through an elastic component, and in the non-working state, is attached to and limited by the first limiting part under the elastic force of the elastic component, and closes the input end; a second component, which is sleeved outside the first component and connected to the first component through a buckle. Wherein, when the fluid is input from the input end, the first component moves towards the second limiting part under the fluid pressure and slowly compresses the elastic component to cause elastic deformation. When the first component and the second component are attached, the first component and the second component are repeatedly attached and separated and move slowly away from the first limiting part together until the second component is limited by the second limiting part, and the output end maintains a slow output during this process; when the fluid stops inputting, the elastic component quickly recovers elastic deformation and bounces the first component together with the second component towards the first limiting part until the first component returns to the position where it is attached to and limited by the first limiting part in the normal state, and at this time the output end stops outputting.

[0007] Preferably, the first component is formed by vulcanizing a frame body and rubber. Wherein, the frame body is columnar, and its circumferential column surface protrudes outward and forms a plurality of equally angularly spaced and symmetrically distributed limiting blocks for cooperating with the buckle. When the first component is connected to the buckle, the limiting blocks abut against and limit the buckle ring surface; the rubber colloid wraps the frame body, and the maximum radial distance of the rubber is less than the distance between two symmetrically arranged limiting blocks.

[0008] Further preferably, the second component is a valve seat with openings at both ends, and a hollow cavity is formed inside it. The second component includes a base sleeved outside the first component and a cylindrical component sleeved outside the elastic component. Wherein, the base is a hollow columnar seat body with an opening at the bottom. On the inner cavity wall of the base at the opening position of its bottom, a clamping groove extending circumferentially along the opening direction is formed, and the buckle is clamped and limited with the clamping groove; the cylindrical component extends towards the first limiting part, and the second component moves towards the first limiting part until the cylindrical component and / or the base contacts and limits with the first limiting part.

[0009] Even more preferably, the first limiting part is a screw sleeve, and the first limiting part forms a sleeve extending towards the first component and the second component and located outside the cylindrical component of the second component. Then, the second component moves towards the first limiting part until the surface of the base contacts the end face of the sleeve and / or the cylindrical component contacts the bottom face of the sleeve.

[0010] More preferably, when the fluid is input from the input end, the first component moves in the direction of the second limiting part under the fluid pressure, then the first component is no longer limited by the first limiting part, and the fluid flows from the input end to the output end through the first limiting part and is output.

[0011] Even further, the first component is in contact with the second component, and a seal is formed between the cylindrical part of the second component and the sleeve of the first limiting part. Then, the sealed space is defined as a volume cavity. After the first component is in contact with the second component, a back pressure is formed by sealing in the volume cavity. Among them, the fluid pressure acts on the bottoms of the first component and the second component at the same time. The second component moves towards the first limiting part under the fluid pressure. The first component is stationary until the resultant force of the fluid pressure and the elastic force of the elastic component. At this time, the first component and the second component are separated; the fluid enters the volume cavity from the gap formed by the separation of the first component and the second component. The pressure in the volume cavity increases until the second component no longer moves towards the first limiting part and hovers. The first component continues to compress the elastic component under the fluid pressure until it comes into contact with the second component again.

[0012] Also preferably, a bushing is provided on the inner wall of the sleeve of the first limiting part, and the cylindrical part of the second component is in contact with the surface of the bushing.

[0013] More preferably, the bushing is made of brass, and the second component is made of polytetrafluoroethylene.

[0014] Correspondingly, the present invention provides a steady-flow check valve based on the aforementioned steady-flow check structure, which includes a valve body with a tee structure, an input end and an output end that open in the horizontal direction on the valve body. It is characterized in that the steady-flow check valve includes: a screw cap, which covers the top of the valve body, and an elastic member extending vertically is fixed to the bottom of the screw cap, and a sleeve is formed outside the elastic member; a limiting part, which is formed at the bottom of the valve body and includes a flange part extending vertically and annularly, and the opening direction of the flange is opposite to the extending direction of the elastic member; a vulcanization assembly, one end of which is connected to the elastic member, and the other end of which is in contact with and abutted against the limiting part under normal conditions and is limited by the limiting part; a valve seat, which sleevs the vulcanization assembly and the elastic member therein, and includes a base and a cylindrical part, and the cylindrical part is located between the sleeve and the elastic member in the horizontal direction. Wherein, when gas is input from the input end, it flows through the limiting part and causes the vulcanization assembly to move in the vertical direction and slowly compress the elastic member to cause elastic deformation thereof until the vulcanization assembly fits against the inner cavity wall of the valve seat, and then the vulcanization assembly and the valve seat repeatedly fit and separate and move slowly in the vertical direction together until the vertical movement of the valve seat is limited by the sleeve, and the output end maintains a steady flow output during this process; when the input end stops outputting, the elastic member quickly recovers its elastic deformation and bounces the valve seat and the vulcanization assembly in the direction of the limiting part, so that the valve seat and the vulcanization assembly quickly return to the initial position. At this time, the vulcanization assembly fits against the limiting part again and the output end closes.

[0015] Due to the adoption of the above technical solutions, the present invention has the following beneficial technical effects compared with the prior art:

[0016] 1. In the process of realizing steady-flow output, this structure is achieved through the first component, the second component, and the elastic member. The first component is a frame body that has been vulcanized, and is assembled with the second component through a buckle. Since the distance between the inner cavity walls of the first component and the second component is small, and the outward expansion of the colloid after vulcanization is smaller than the outer diameter of the frame body, when gas flows through the first component, it can enter through the gap between the first component and the second component. Therefore, during the steady-flow output process, the first component and the second component repeatedly go through the process of fitting, separating, and then fitting again. Thus, the distance between the first component and the first limiting part in the base gradually increases slowly, that is, the output of the fluid is a steady-flow or steady-voltage output.

[0017] 2. During the above-mentioned steady-flow output process, although the first component and the second component will also show a repeated state of separation after fitting, in this device, on the one hand, the frame of the first component is vulcanized and wrapped by rubber. Therefore, the process of fitting and separating between it and the inner cavity wall of the second component is significantly slowed down in terms of both strength and speed compared with the component collision and beating in the prior art. On the other hand, the second component, that is, the valve seat, is made of polytetrafluoroethylene. By using the self-lubricating property of polytetrafluoroethylene, the friction between the valve seat and the kit of the screw cap is reduced, and due to its plastic property, the abnormal noise during the operation output process of the structure is further reduced.

[0018] 3. During the process of realizing rapid check valve function of this structure, when the fluid at the input end stops outputting, the elastic component restores its elastic deformation and quickly bounces the first component together with the second component back to the initial position until the first component is limited by the limiting part in the base body or the valve body again, realizing the rapid closing of the input end or the output end. Thus, the downstream pressure is maximally retained, and the waste of the gas source caused by the slow closing of the output end is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional view showing the cross-sectional structure of the steady-flow check valve described in a preferred embodiment of the present invention;

[0020] Figure 2 is a schematic diagram showing Figure 1 the frame structure of the first component in the shown preferred embodiment;

[0021] Figure 3 is a schematic diagram showing Figure 2 the structure of the first component formed after the frame vulcanization treatment shown;

[0022] Figure 4 is a cross-sectional view showing Figure 1 the cross-sectional structure of the second component in the shown preferred embodiment;

[0023] Figure 5 is a schematic diagram showing Figure 1 the structure of the buckle in the shown preferred embodiment;

[0024] Figure 6 is a partial enlarged schematic diagram showing Figure 1 the enlarged structure of part A in;

[0025] Figure 7 is a state diagram showing Figure 1 the state of the shown preferred embodiment in the first working condition of slow opening;

[0026] Figure 8 is a partial enlarged schematic diagram showing Figure 7 the enlarged structure of part B in;

[0027] Figure 9 is a state diagram, showing that Figure 1 the preferred embodiment shown is in the state where separation is initiated under operating condition II;

[0028] Figure 10 is a partial enlarged view, showing Figure 9 the enlarged structure of part C in

[0029] Figure 11 is a state diagram, showing that Figure 1 the preferred embodiment shown is in the state where they are re - attached after separation under operating condition III;

[0030] Figure 12 is a state diagram, showing that Figure 1 the preferred embodiment shown is in the state of maximum opening under operating condition IV. Detailed implementation manners

[0031] Embodiments of a steady - flow check structure according to the present invention will be described below with reference to the accompanying drawings. Those of ordinary skill in the art can recognize that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the drawings and the description are illustrative in nature and are not used to limit the protection scope of the claims. In addition, in this specification, the drawings are not drawn to scale, and the same reference numerals represent the same parts.

[0032] It should be noted that the expressions "first" and "second" used in the embodiments of the present invention are both for distinguishing two entities or parameters with the same name but different, so "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the invention. This will not be elaborated in the subsequent embodiments one by one.

[0033] The steady - flow check structure provided by the preferred embodiment of the present invention can have a single input end and an output end, or can correspond to multiple input ends and output ends. The opening directions of the input end and the output end can be the same or different. For example, usually, the opening directions of the input end and the output end can be configured to be horizontally oriented, and in different embodiments, according to the output requirements, the opening directions can also be configured such that the opening directions of the input end and the output end are perpendicular, or any other style.

[0034] The steady flow check structure includes a base body and a first component and a second component within the base body. A first limiting portion and a second limiting portion are formed within the base body. The first limiting portion can be located between the input end and the output end and is disposed near the input end. Under normal conditions, the first limiting portion limits the first component. The second limiting portion can also be located between the input end and the output end, away from the input end and opposite to the first limiting portion. For example, in a preferred embodiment, a stepped flange is formed within the base body, and this stepped flange constitutes the first limiting portion, such that the bottom of the first component contacts and abuts against the edge of the stepped flange to form a limiting structure. Correspondingly, a screw cap is provided at the top of the base body. The position of the screw cap is opposite to the first limiting portion in the vertical direction, and the screw cap extends towards the direction of the first limiting portion to form a kit for limiting the second component, and this kit is the second limiting portion. The movement of the second component towards the screw cap is limited by the second limiting portion. In this embodiment, to ensure airtightness, an O-ring or a Y-ring seal is added between the screw cap and the base body during assembly. In other embodiments, the relationship between the screw cap and the base body can also be integrally formed, and the embodiments of the present invention are not limited thereto.

[0035] The first component is a vulcanized component formed by subjecting a metal or non-metal structural frame to vulcanization treatment. That is, the first component can be a frame component wrapped with rubber. Thus, when it fits with the second component, the rubber colloid on it contacts and presses against the second component, and quickly forms a seal. The first component and the second component are connected by snap-fit assembly, and the snap fits with the outer expansion of the frame of the first component to form an interference structure.

[0036] When fluid is input, during the upward movement of the first component and the second component, the fluid intermittently enters the volume cavity formed between the second component and the second limiting portion through the gap between the first component and the second component. In this way, the second component is continuously pushed upward by the fluid pressure. In addition to the pressure from the fluid, the first component also receives the elastic force from the elastic component. Therefore, during this process, the first component and the second component repeatedly adhere and separate. When the first component moves towards the second component, the outer expansion of the frame is separated from the buckle until the rubber colloid on the first component is tightly attached to the inner cavity wall of the second component. When the first component moves downward, it moves until the outer expansion of the frame of the first component is limited by the buckle and then stops. During the input process, on the one hand, due to the repeated separation and combination between the first component and the second component, the opening between the first component and the first limiting portion slowly increases; on the other hand, the first component compresses the elastic component. As the elastic deformation of the elastic component increases, the upward movement rate of the first component becomes slower. Due to these two reasons combined, a stable pressure and stable flow output of the fluid can be achieved. When the fluid stops outputting, the bottoms of the first component and the second component no longer receive the force from the fluid towards the second limiting portion direction, so they no longer compress the elastic component. The elastic component quickly recovers its elastic deformation to quickly bounce the first component and the second component apart until the first component is reattached to the first limiting portion, and at this time, the output end stops outputting. It should be noted that in different embodiments of the present invention, the output end stops outputting when the first component and the first limiting portion are attached and limited, so that the fluid input at the input end flows to the position of the first limiting portion and then stops. In other embodiments, the output end can also stop outputting by cutting off the fluid at the input end or the output end, or by cutting off the first component and the first limiting portion at a position close to the input end or the output end.

[0037] Next, taking a flow-stabilizing check valve based on the above flow-stabilizing check structure as an example, the structure and process of achieving flow stabilization and check in a preferred embodiment of the present invention will be specifically described. Figure 1 It is a cross-sectional view showing the cross-sectional structure of the flow-stabilizing check valve described in a preferred embodiment of the present invention. As Figure 1 shown, with Figure 1 the direction shown as a reference, the flow-stabilizing check valve described in this preferred embodiment of the present invention includes a valve body 10 with a three-way structure, an input end 20 with a horizontal opening direction at the bottom of the valve body 10, and an output end 30. A screw cap 40 is covered on the top of the valve body 10. The screw cap 40 and the valve body 10 can be fixed by riveting or other means. And to further improve the airtightness, when the screw cap 40 and the valve body 10 are assembled, usually a sealing ring 41 can also be arranged between the screw cap 40 and the valve body 10. The style of the sealing ring 41 can be selected as O-shaped or Y-shaped. Refer to Figure 1, in this embodiment, the screw cap 40 extends vertically downward, that is, in the direction of the bottom of the valve body, to form a kit 42. A resilient member 43 extending in the same direction as the kit 42 is fixed to the bottom of the screw cap 40. Looking back at the foregoing structural description, in the flow-stabilizing check valve described in this preferred embodiment, the kit 42 constitutes the second limiting portion. Additionally, a bushing 44 can be fixed to the inner wall of the kit 42 of the screw cap 40.

[0038] Continuing to refer to Figure 1 , within the valve body 10, between the input end 20 and the output end 30, a flange portion 11 that extends circumferentially and surrounds the inner wall of the valve body 10 is formed. An opening 12 formed on the flange portion 11 communicates with the input end 20, that is, the gas input from the input end 20 flows to the opening 12 of the flange portion 11. As shown in the figure, the opening direction of the opening 12 is opposite to the extending direction of the resilient member 43. In the flow-stabilizing check valve described in this preferred embodiment, the flange portion 11 constitutes the first limiting portion.

[0039] The vulcanization assembly, as the first assembly in the foregoing flow-stabilizing check structure, is formed by vulcanizing a columnar frame. Figure 2 is a schematic diagram showing Figure 1 the frame structure of the first assembly in the shown preferred embodiment, Figure 3 is a schematic diagram showing Figure 2 the structure of the first assembly formed after the vulcanization treatment of the shown frame. First, refer to Figure 2 , in this preferred embodiment, the frame 51 of the vulcanization assembly 50 is a cylindrical frame, and four limiting blocks 511 that protrude outward in a direction perpendicular to the axis line of the end face of the frame 51 and are equally angularly spaced are formed on the cylindrical surface of the frame 51. Then, refer to Figure 3 , after the vulcanization treatment, the frame 51 is wrapped by a rubber colloid 52. Comparing Figure 2 and Figure 3 it can be obtained that the radially outward expansion distance of the rubber colloid 52 is less than the distance between two symmetric limiting blocks 511. It can also be said that the radially outward expansion distance of the rubber colloid 52 is less than the maximum outward expansion distance of the frame 51.

[0040] Looking back at Figure 1 , the vulcanization assembly 50, as the first assembly, is located within the valve body 10 and, in the non-output state, abuts against and is limited by the flange portion 11. The vulcanization assembly 50 is assembled with the valve seat 60, that is, the second assembly, through a snap structure. Figure 4 is a cross-sectional view showing Figure 1 the cross-sectional structure of the second assembly in the shown preferred embodiment, as shown in Figure 1 and Figure 4As shown, in this preferred embodiment, the valve seat 60, as the second component, is sleeved outside the vulcanization component 50 and the elastic component 43. The part of the valve seat 60 outside the vulcanization component 50 is defined as the base 61, and the part outside the elastic component 43 is defined as the cylindrical component 62. It is not difficult to see that the valve seat 60 should be a Figure 4 hollow structure as shown, and the hollow cavity formed inside it houses the vulcanization component 50 and the elastic component 43. On the inner cavity wall at the bottom opening position of the base 61, a clamping groove 63 extending circumferentially along the opening direction is formed. Then, as Figure 5 shown, the buckle 70 is clamped in the clamping groove 63, and the cylindrical component 62 is in contact with the bushing on the kit 42. Figure 6 is a partial enlarged schematic diagram showing the Figure 1 enlarged structure of part A in Figure 1 . Then, referring to Figure 3 , Figure 5 and Figure 6 , after the vulcanization component 50 is assembled with the valve seat 60, a gap is formed between the vulcanization component 50 and the inner cavity of the valve seat 60. The vulcanization component 50 is clamped with the buckle 70. As mentioned above, since the outward expansion of the rubber colloid 52 on the vulcanization component 50 is smaller than the outward expansion of the frame body 51, when the vulcanization component 50 is clamped with the buckle 70, the bottom of the limiting block 511 contacts and abuts against the surface of the buckle 70, and a gap is also formed between the buckle 70 and the inner cavities of the vulcanization component 50 and the valve seat 60. That is to say, in the non-sealed state, gas can enter the cavity between the cylindrical component 62 of the valve seat 60 and the elastic component 43 through this gap.

[0041] The steady flow output and rapid check process of the above-mentioned preferred embodiment will be described below with reference to the drawings. In the normal state, or in the non-output state, the state of the steady flow check valve described in this embodiment is as Figure 1 shown, that is, in the non-output state, under the elastic force of the elastic component 43, the vulcanization component 50 is in contact with the flange part 11 in the valve body 10, so that the gas input from the input end 20 flows to the flange part 11 and is blocked by the bottom of the vulcanization component 50.

[0042] Figure 7 is a state diagram showing the Figure 1 preferred embodiment shown in the slow opening state of working condition 1. Figure 8 is a partial enlarged schematic diagram showing the Figure 7 enlarged structure of part B in Figure 7 and Figure 8 The arrows in Figure 7 and Figure 8, when a gas pressure of a certain magnitude acts on the bottom of the vulcanization assembly 50, the vulcanization assembly 50 is subjected to an upward gas pressure acting on its bottom, overcoming the elastic force of the elastic member 43 to compress the elastic member 43 and causing it to undergo elastic deformation, and slowly moving toward the side of the screw cap 40. Thus, on the one hand, the separation of the vulcanization assembly 50 from the flange portion 11 allows gas to flow in from there, and part of the gas can be directly output from the output end 30, while the remaining part flows into the region enclosed between the valve seat 60 and the elastic member 43 and the bottom of the screw cap 40 through the gap between the vulcanization assembly 50 and the inner cavity of the valve seat 60. For the convenience of subsequent description, this region is defined as the volume cavity 80; on the other hand, when the vulcanization assembly 50 is separated from the flange portion 11, gas flows in, and the bottom of the valve seat 60 is also subjected to the pressure from the gas; as described above, since there is a gap between the vulcanization assembly 50 and the inner cavity wall of the valve seat 60, the upward movement of the vulcanization assembly 50 causes the rubber colloid 52 thereon to fit with the inner cavity wall of the valve seat 60, thus quickly achieving the seal between the vulcanization assembly 50 and the valve seat 60, so that no more gas flows into the volume cavity 80.

[0043] After the state of working condition one, gas continues to flow in. Figure 9 is a state diagram showing Figure 1 the preferred embodiment shown is in the state of opening and separating in working condition two. Figure 10 is a partial enlarged view showing Figure 9 the enlarged structure of part C in Figure 9 and Figure 10 the arrows in show the flow direction of gas under this working condition. Refer to Figure 9 and Figure 10 , at this time, as described above, the bottom of the valve seat 60 is also subjected to the pressure from the gas, that is, at this time the gas pressure acts on the bottoms of both the valve seat 60 and the vulcanization assembly 50, then the valve seat 60 is further lifted upward toward the screw cap 40 by the upward force from the gas, and at this time, in addition to the upward gas pressure on the vulcanization assembly 50, the elastic force received due to the further compression of the elastic member 43 also gradually increases. Subsequently, refer to Figure 9 , in working condition two, after the vulcanization assembly 50 and the valve seat 60 are in contact in working condition one and then separated again, the valve seat 60 overcomes the back pressure in the volume cavity 80 and is in a hovering state. At the same time, refer to Figure 10 , since the vulcanization valve body 10 is still subjected to the elastic force of the elastic member 43, it is separated from the valve seat 60 until the vulcanization assembly 50 is again clamped and limited by the buckle 70, and gas re-enters the volume cavity 80 from the gap between the vulcanization assembly 50 and the valve seat 60. Then, under working condition two, the back pressure in the volume cavity 80 further increases.

[0044] As the back pressure in the volume cavity 80 further increases, the next working condition is entered.Figure 11 is a state diagram showing Figure 1 the preferred embodiment shown is in the state where it fits together again after separation in working condition three, Figure 11 and the arrow in Figure 11 shows the flow direction of the gas under this working condition. Refer to

[0045] After that, the vulcanizing assembly 50 and the valve seat 60 fit together and separate repeatedly until the maximum opening state is reached. Figure 12 is a state diagram showing Figure 1 the preferred embodiment shown is in the state of maximum opening in working condition four, Figure 12 and the arrow in Figure 12 shows the flow direction of the gas under this working condition. Refer to Figure 12 When the vulcanizing assembly 50 and the valve seat 60 rise together until the top surface of the base 61 of the valve seat 60 contacts and abuts against the bottom surface of the kit 42 and cannot rise further, at this time, the valve reaches the maximum opening, and at this time, the intake pressure and the outlet pressure should be equal. In other embodiments of the present invention, regarding the limit between the valve seat 60 and the screw cap 40, it can be the limit between the base 61 and the kit 42 as shown in

[0046] When the gas input at the input end 20 is quickly closed, then the bottom of the vulcanizing assembly 50 and the valve seat 60 are no longer stressed, and the back pressure in the volume cavity 80 reaches the maximum. Coupled with the fact that the elastic deformation of the elastic member 43 also reaches the maximum, under the combined action of the back pressure in the volume cavity 80 and the elastic member 43, the vulcanizing assembly 50 and the valve seat 60 are quickly bounced apart, and the vulcanizing assembly 50 fits and is limited to the flange portion 11 again, so that the opening 12 in the flange portion 11 is closed again, and in this closed state, the residual gas at the output end cannot flow back to the input end 20 side. Since all components return to the initial state in this state, the state under this working condition should be the same as that shown in Figure 1

[0047] Combined with Figures 7 to 12 ​, it can be seen that due to the repeated fitting process between the vulcanization component 50 and the valve seat 60, the upward movement process of the vulcanization component 50 is slow, so that the rate of the gas output on the output end 30 side is also very gentle, thus realizing a steady flow or steady pressure output. Also, because it can be quickly closed and prevent backflow, the check valve effect is achieved.

[0048] Due to the adoption of the above technical solutions, the present invention has the following beneficial technical effects compared with the prior art:

[0049] 1. In the process of realizing a steady flow output, this structure is achieved through the first component, the second component, and the elastic component. The first component is a frame body that has been vulcanized. It is assembled with the second component through a buckle. Since the distance between the inner cavity walls of the first component and the second component is small, and the outward expansion of the colloid after vulcanization is smaller than the outer diameter of the frame body, when gas flows through the first component, it can enter through the gap between the first component and the second component. Thus, in the process of steady flow output, the first component and the second component repeatedly separate and then fit again after fitting. Therefore, the distance between the first component and the first limiting part in the base body gradually increases slowly, that is, the output of the fluid is a steady flow or steady pressure output;

[0050] 2. In the above process of steady flow output, although the first component and the second component also show a repeated state of separating after fitting, in this device, on the one hand, the frame body of the first component is wrapped by rubber after vulcanization. Therefore, the process of separating and fitting between it and the inner cavity wall of the second component is significantly slowed down in terms of both strength and speed compared with the collision and beating of the components in the prior art; on the other hand, the second component, that is, the valve seat, is made of polytetrafluoroethylene. Utilizing the self-lubricating property of polytetrafluoroethylene, the friction between the valve seat and the kit of the screw cap is reduced, and due to its plastic property, the abnormal noise during the operation and output process of the structure is further reduced;

[0051] 3. In the process of realizing rapid check valve, when the fluid at the input end stops outputting, the elastic component restores its elastic deformation and quickly bounces the first component and the second component together to the initial position until the first component is limited by the limiting part in the base body or the valve body again, realizing the rapid closing of the input end or the output end, thus maximizing the retention of the downstream pressure and avoiding the waste of the gas source caused by the slow closing of the output end.

[0052] The above has described the present invention in detail. The description of the embodiments is only used to help understand the method and its core idea of the present invention. The purpose is to enable those skilled in this field to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A steady flow check structure, which includes at least one input end and at least one output end, Characterized in that, The steady flow check structure includes: A base body, in which a first limiting part close to the input end and a second limiting part far from the input end are formed along the fluid flow direction; A first component, which is connected to the second limiting part through an elastic component, and in the non-working state, is attached and limited to the first limiting part under the elastic force of the elastic component, and closes the input end; A second component, which is sleeved outside the first component and connected to the first component through a buckle. Among them, The second component includes a base sleeved outside the first component and a cylindrical component sleeved outside the elastic component. The second limiting part forms a kit extending towards the first component and the second component and located outside the cylindrical component of the second component. Then, the second component moves towards the first limiting part until the surface of the base contacts the end face of the kit and / or the cylindrical component contacts the bottom surface of the kit. When fluid is input from the input end, the first component moves towards the second limiting part under the fluid pressure and slowly compresses the elastic component to cause elastic deformation. When the first component and the second component are attached, the first component and the second component repeatedly attach and separate and move slowly away from the first limiting part together until the second component is limited by the second limiting part, and the output end maintains slow output during this process; when the fluid stops inputting, the elastic component quickly recovers elastic deformation and bounces the first component and the second component towards the first limiting part until the first component returns to the position where it is attached and limited to the first limiting part under normal conditions, and then the output end stops outputting.

2. The steady flow check structure according to claim 1, Characterized in that, The first component is formed by vulcanizing a frame body and rubber. Among them, The frame body is columnar, and its peripheral columnar surface protrudes outward and forms a plurality of equally angularly spaced and symmetrically distributed limiting blocks for cooperating with the buckle. When the first component is connected to the buckle, the limiting blocks abut against the buckle ring surface for limiting; The colloid of the rubber wraps the frame body, and the maximum radial distance of the rubber is less than the distance between two symmetrically arranged limiting blocks.

3. The steady flow check structure according to claim 2, Characterized in that, The second component is a valve seat with openings at both ends, and a hollow cavity is formed inside it. Among them, The base is a hollow columnar seat body with an open bottom. On the inner cavity wall of the base at the position of its bottom opening, a clamping groove extending circumferentially along the opening direction is formed, and the buckle is clamped and limited with the clamping groove; The cylindrical component extends towards the first limiting part, and the second component moves towards the first limiting part until the cylindrical component and / or the base contact and limit the first limiting part.

4. The steady flow check structure according to claim 3, Characterized in that, The second limiting part is a screw sleeve.

5. The steady flow check structure according to claim 4, Characterized in that, When fluid is input from the input end, the first component moves in the direction of the second limiting part under the fluid pressure, then the first component is no longer limited by the first limiting part, and the fluid flows from the input end to the output end through the first limiting part and is output.

6. The steady flow check structure according to claim 4, wherein, the first component is in contact with the second component, and a seal is formed between the cylindrical component and the kit of the first limiting part. Then, the sealed space is defined as a volume cavity. After the first component is in contact with the second component, a back pressure is formed by sealing in the volume cavity, where the fluid pressure acts on the bottoms of the first component and the second component simultaneously. The second component moves towards the second limiting part under the fluid pressure. The first component moves until it stops under the combined action of the fluid pressure and the elastic force of the elastic component. At this time, the first component and the second component are separated; the fluid enters the volume cavity from the gap formed by the separation of the first component and the second component. The pressure in the volume cavity increases until the second component no longer moves towards the second limiting part and hovers. The first component continues to compress the elastic component under the fluid pressure until it comes into contact with the second component again.

7. The steady flow check structure according to any one of claims 4 to 6, wherein, a bushing is provided on the inner wall of the kit of the first limiting part, and the cylindrical component of the second component is in contact with the surface of the bushing.

8. The steady flow check structure according to claim 7, wherein, the bushing is made of brass material, and the second component is made of polytetrafluoroethylene.

9. A steady flow check valve based on the steady flow check structure according to any one of claims 1 to 8, which includes a valve body with a tee structure, and an input end and an output end that open in the horizontal direction on the valve body, wherein, the steady flow check valve includes: a screw cap, which covers the top of the valve body. The bottom of the screw cap fixes an elastic component extending in the vertical direction, and a kit is formed outside the elastic component; a limiting part, which is formed at the bottom of the valve body and includes a flange part extending and surrounding in the vertical direction. The opening direction formed by the flange is opposite to the extending direction of the elastic component; a vulcanization component, one end of which is connected to the elastic component, and the other end of which is in contact with and abuts against the limiting part under normal conditions and is limited by the limiting part; a valve seat, which sleevs the vulcanization component and the elastic component inside. It includes a base and a cylindrical component. The cylindrical component is horizontally located between the kit and the elastic component, where When gas is input from the input end, it flows through the limiting part and causes the vulcanization assembly to move in the vertical direction and slowly compress the elastic member to produce elastic deformation until the vulcanization assembly fits against the inner cavity wall of the valve seat. Then, the vulcanization assembly and the valve seat fit and separate repeatedly and move slowly in the vertical direction together until the vertical movement of the valve seat is limited by the kit. During this process, the output end maintains a steady flow output; when the input end stops outputting, the elastic member quickly recovers its elastic deformation and bounces the valve seat and the vulcanization assembly in the direction of the limiting part, so that the valve seat and the vulcanization assembly quickly return to the initial position. At this time, the vulcanization assembly fits against the limiting part again, and the output end closes.

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