A one-way valve with high impact resistance and stability and method thereof

Abstract

The present invention discloses a one-way valve with high impact resistance and stability and a method thereof, and relates to the field of valve devices. A first groove provided in the middle of a valve stem and an adjustable support seat constitutes a sliding pair, a buffer spring is provided between the valve disc and the adjustable support seat, an arc-shaped spring slide rail is provided at the bottom of the groove of the adjustable support seat, and the adjustable support seat is threadedly connected to the inner wall of the valve body; the adjustable support seat and the transmission disc are torque transmission connected; the annular area between the bottom of the transmission disc and the top of the valve cover is divided into a first arc-shaped area and a second arc-shaped area; a return spring is provided in the first arc-shaped area; and the second arc-shaped area is connected to the inlet channel of the valve body through a pilot channel. The present invention drives the transmission disc to rotate by the gas pressure in front of the one-way valve to change the position of the adjustable support seat so as to change the effective number of coils of the spring, thereby affecting the spring stiffness, and utilizing the variable stiffness characteristics affected by the working conditions to reduce the impact of the valve disc on the support seat during the opening process of the one-way valve, thereby improving the fatigue life of the valve disc and increasing the stability of the opening process.

Description

Technical Field

[0001] The invention belongs to the field of valve devices, and in particular relates to an impact-resistant and highly stable one-way valve and a method thereof. Background Art

[0002] A one-way valve is a valve that allows the medium to flow only along the inlet channel, but the medium in the outlet channel cannot flow back. It is commonly known as a one-way valve. A one-way valve is also called a check valve or a non-return valve. It is used in hydraulic systems to prevent the reverse flow of oil, or in pneumatic systems to prevent the reverse flow of compressed air. In some cases where the inlet and outlet conditions change dramatically, such as the one-way valve in a compressor system or a reciprocating pump system, it is necessary to open and close frequently, causing wear on the valve disc, support plate and valve seat, which may cause leakage in the one-way valve, and in severe cases, the valve disc may be damaged and broken. Therefore, how to reduce the impact of the valve disc on the support seat during the opening process of the one-way valve, improve the fatigue life of the valve disc, and increase the stability of the opening process are problems that need to be solved today. Summary of the invention

[0003] The object of the present invention is to overcome the defects in the prior art and provide a one-way valve with high impact resistance and stability and a method thereof.

[0004] The specific technical solutions adopted by the present invention are as follows:

[0005] In the first aspect, the present invention provides a one-way valve with impact resistance and high stability, wherein an inlet channel and an outlet channel are provided on the valve body, a valve disc is installed in the middle valve cavity of the valve body, a valve stem fixedly connected to the bottom of the valve disc and a first groove provided in the middle of an adjustable support seat form a sliding pair to control the opening and closing of the one-way valve; a buffer spring with axial preload is provided between the bottom of the valve disc and the bottom of the first groove of the adjustable support seat, an arc-shaped spring slide rail is provided at the bottom of the groove of the adjustable support seat, and the adjustable support seat is threadedly connected to the inner wall of the valve body; one end of the buffer spring is fixed to the bottom of the valve disc, and the other end is placed in the spring slide rail, and the buffer spring can be moved along the spring slide rail by rotating the adjustable support seat to change the effective force of the buffer spring Number of turns; a polygonal convex plate is provided at the bottom of the adjustable support seat, and a polygonal groove is provided on the transmission disc. The torque transmission connection is realized between the adjustable support seat and the transmission disc through the polygonal convex plate and the polygonal groove, and the polygonal convex plate can slide axially along the polygonal groove; the transmission disc is rotatably connected to the valve cover, a stopper is fixed on the top of the valve cover, and a thrust plate is fixed on the bottom of the transmission disc. The stopper and the thrust plate divide the annular area between the bottom of the transmission disc and the top of the valve cover into a first arc zone and a second arc zone; a return spring at the original length in the initial state is provided in the first arc zone; one end of the return spring is fixedly connected to the thrust plate, and the other end is contact-connected with the stopper; the second arc zone is connected to the inlet channel of the valve body through a pilot channel.

[0006] Preferably, a first sealing ring capable of forming a sealing connection with the valve body is provided on the top of the valve disc, and a second sealing ring for forming a sealing connection is provided between the valve cover and the valve body.

[0007] Preferably, the spring slide rail is a pipe segment structure with a square hollow cross-section.

[0008] Preferably, the polygonal convex plate and the polygonal groove are both cross-shaped structures.

[0009] Preferably, a cylindrical clamping shaft is provided at the bottom of the transmission disc, and the transmission disc is rotatably connected to the valve cover via the clamping shaft.

[0010] Preferably, the valve cover, transmission plate, adjustable support seat, valve stem and valve disc are all coaxially arranged.

[0011] Preferably, the top of the valve cover is provided with a first slot, a second slot and a third slot spaced apart along the circumferential direction, and the stopper can be selectively connected to the first slot, the second slot and the third slot to change the rotation range of the adjustable support seat.

[0012] Preferably, the first arc-shaped area and the second arc-shaped area are connected through a gap between the thrust plate and the valve body.

[0013] In a second aspect, the present invention provides a method for mitigating impact using any one of the anti-impact high-stability one-way valves described in the first aspect, which is specifically as follows:

[0014] S1: When the one-way valve is opened, the gas medium enters the valve body from the inlet channel, exerting a downward force on the top of the valve disc; at the same time, the gas medium enters the second arc-shaped area through the pilot channel. Since the stopper is fixedly connected to the valve cover, the gas medium acts on the thrust plate to drive the transmission disc to rotate, and compresses the return spring at the same time, until the gas force is equal to the spring force of the return spring to reach a balance;

[0015] During the rotation of the transmission disc, the torque is transmitted to the adjustable support seat through the matching relationship between the polygonal convex plate and the polygonal groove, so that the adjustable support seat is rotated and raised along the thread of the valve body; during the rising process of the adjustable support seat, one end of the buffer spring gradually slides out along the spring slide rail, thereby changing the supporting position of the buffer spring and the adjustable support seat, reducing the effective force-bearing circles of the buffer spring, increasing the stiffness of the buffer spring, reducing the impact of the valve disc on the adjustable support seat, improving the fatigue life of the valve disc, and increasing the stability of the valve disc opening process;

[0016] In addition, since the adjustable support seat rotates upward along the thread, the accelerated displacement of the valve disc during the opening process is reduced, and the speed at which the valve disc reaches the upper limit of the adjustable support seat is further reduced, thereby reducing the impact of the valve disc on the adjustable support seat;

[0017] S2: After the one-way valve is opened, the gas medium enters the first arc area from the second arc area along the gap between the thrust plate and the valve body under the action of the pressure difference. When the pressure at both ends of the thrust plate is equal, the transmission plate returns to the initial position under the action of the return spring, and at the same time drives the adjustable support seat to rotate downward along the thread, so that the support position of the buffer spring returns to the initial state, realizing the limit of the one-way valve and keeping the maximum opening unchanged.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention realizes the buffering effect during the opening process of the one-way valve mainly through two aspects: 1) the gas pressure in front of the one-way valve drives the transmission disk to rotate and change the position of the adjustable support seat to change the effective number of turns of the buffer spring, thereby affecting the stiffness of the buffer spring; 2) the variable stiffness characteristics affected by the working conditions are utilized to reduce the impact of the valve disc on the adjustable support seat during the opening process of the one-way valve, thereby improving the fatigue life of the valve disc and increasing the stability of the opening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the cross-sectional structure of a one-way valve;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of a one-way valve;

[0022] Figure 3 It is a three-dimensional structural diagram of the thrust mechanism of the one-way valve (including the transmission disc, the return spring and the stopper);

[0023] Figure 4 It is a three-dimensional structural schematic diagram of a variable stiffness spring mechanism (including a valve disc, a buffer spring and an adjustable support seat);

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the assembly of the variable stiffness spring mechanism and the thrust mechanism;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the assembly of the thrust mechanism and the valve cover;

[0026] In the figure: 1. valve body; 2. pilot channel; 3. valve disc; 4. buffer spring; 5. adjustable support seat; 6. transmission plate; 7. valve cover; 801. first sealing ring; 802. second sealing ring; 9. return spring; 10. stopper; 501. spring slide rail; 502. thread; 503. polygonal convex plate; 601. thrust plate; 602. polygonal groove; 603. clamping shaft; 701. first clamping slot; 702. second clamping slot; 703. third clamping slot. DETAILED DESCRIPTION

[0027] The present invention is further described and illustrated below in conjunction with the accompanying drawings and specific embodiments. The technical features of each embodiment of the present invention can be combined accordingly without conflicting with each other.

[0028] like Figure 1 and 2 As shown in the figure, a high-stability one-way valve with impact resistance provided by the present invention is provided. An inlet channel and an outlet channel are provided on the valve body 1. A valve flap 3 for controlling the opening and closing of the one-way valve is installed in the middle valve cavity of the valve body 1. Figure 1 The position of the valve flap 3 shown is the one-way valve closed state. A valve stem is fixed to the bottom of the valve flap 3, and a first groove is opened in the middle of the adjustable support seat 5. The valve stem and the first groove together form a sliding pair to control the opening and closing of the one-way valve. A buffer spring 4 is provided between the bottom of the valve flap 3 and the bottom of the first groove of the adjustable support seat 5. The buffer spring 4 has an axial preload force that can be extended and retracted along the direction of the valve stem. Figure 4 As shown, an arc-shaped spring rail 501 is provided at the bottom of the groove of the adjustable support seat 5, and the position and angle of the rail 501 are consistent with the adjacent buffer spring 4. One end of the buffer spring 4 is fixed to the bottom of the valve disc 3, and the other end is placed in the spring rail 501. By rotating the adjustable support seat 5, the buffer spring 4 can be moved along the spring rail 501, and the length of the buffer spring 4 leaking out of the spring rail 501 is changed, thereby changing the effective force-bearing number of the buffer spring 4. The adjustable support seat 5 is connected to the inner wall of the valve body 1 by a thread 502. When the adjustable support seat 5 rotates, it can move up and down in the valve body 1 along the thread 502. In this embodiment, the spring rail 501 can be set as a pipe section structure with a square hollow cross-section.

[0029] A polygonal convex plate 503 is provided at the bottom of the adjustable support seat 5, and a polygonal groove 602 is provided on the transmission plate 6. The polygonal convex plate 503 and the polygonal groove 602 are matched and connected, so that the adjustable support seat 5 and the transmission plate 6 are connected to each other through the polygonal convex plate 503 and the polygonal groove 602 to achieve torque transmission connection, and the polygonal convex plate 503 can slide axially along the polygonal groove 602. Figure 3 and 4 As shown, in this embodiment, the polygonal convex plate 503 and the polygonal groove 602 can be set to a cross-shaped structure. In actual application, the polygonal convex plate 503 transmits torque to drive the adjustable support seat 5 to rotate and move up and down along the thread, thereby changing the position of the buffer spring 4 in the spring slide rail 501, changing the effective number of turns of the buffer spring 4, and thus affecting the stiffness of the buffer spring 4.

[0030] like Figure 6As shown, the transmission disc 6 is rotatably connected with the valve cover 7, a stopper 10 is fixed on the top of the valve cover 7, and a thrust plate 601 is fixed on the bottom of the transmission disc 6. The stopper 10 and the thrust plate 601 separate the annular area between the bottom of the transmission disc 6 and the top of the valve cover 7 into a first arc area and a second arc area, and the first arc area and the second arc area are relatively closed. Specifically, in order to achieve the reset of the adjustable support seat 5 and the transmission disc 6, a certain connecting gap should be left between the first arc area and the second arc area. For example, a certain gap can be left between the thrust plate 601 and the valve body 1, so that the first arc area and the second arc area are connected through the gap between the thrust plate 601 and the valve body 1.

[0031] like Figure 5 As shown, a return spring 9 at the original length in the initial state is provided in the first arc region. One end of the return spring 9 is fixedly connected to the thrust plate 601, and the other end is in contact with the stopper 10. The second arc region is connected to the inlet channel of the valve body 1 through the pilot channel 2. In actual application, the gas medium acts on the thrust plate 601 to drive the transmission disk 6 to rotate, and transmits torque to the polygonal convex plate 503 at the bottom of the adjustable support seat 5 through the polygonal groove 602, thereby causing the adjustable support seat 5 to rotate along the thread to move up and down, and at the same time, the polygonal convex plate 503 at the bottom of the adjustable support seat 5 slides up and down in the polygonal groove 602 at the top of the transmission disk 6.

[0032] In this embodiment, a groove is formed on the top of the valve flap 3, and a first sealing ring 801 is placed in the groove. The valve flap 3 can form a sealed connection with the valve body 1 through the first sealing ring 801, thereby achieving sealing between the valve flap 3 and the valve body 1 when the valve flap 3 is closed. A second sealing ring 802 for forming a sealed connection is provided between the valve cover 7 and the valve body 1, thereby preventing gas from leaking from the connection between the valve cover 7 and the valve body 1. Figure 5 As shown, a cylindrical clamping shaft 603 is provided at the bottom of the transmission disc 6, and the transmission disc 6 is rotatably connected to the valve cover 7 through the clamping shaft 603. In order to improve the working performance of the one-way valve, the valve cover 7, the transmission disc 6, the adjustable support seat 5, the valve stem and the valve disc 3 are preferably coaxially arranged. Figure 6 As shown, in order to change the rotation range of the adjustable support seat 5 according to the size of the air pressure in the inlet channel, and then the change range of the spring stiffness of the buffer spring 4, a first clamping groove 701, a second clamping groove 702 and a third clamping groove 703 can be provided at intervals along the circumferential direction on the top of the valve cover 7, and the stopper 10 can be selectively connected with the first clamping groove 701, the second clamping groove 702 and the third clamping groove 703 to change the rotation range of the adjustable support seat 5. In fact, the number of the clamping grooves provided on the top of the valve cover 7 can also be other numbers, which can be adjusted according to actual conditions, and will not be repeated here.

[0033] by Figure 6Taking the slot position shown as an example, if the gas pressure introduced is relatively high, the block 10 can be placed in the first slot 701. At this time, the length and telescopic range of the return spring 9 are relatively large, and the rotation range of the adjustable support seat 5 driven by the gas pressure is also large. The length range of the part of the buffer spring 4 extending out of the spring slide rail 501 is also large, and the range of variation of the spring stiffness is also large, which can better play a buffering role. If the block 10 is installed in the first slot 701, the adjustable support seat 5 has the greatest degree of adjustability; if the block 10 is installed in the second slot 702, the adjustable support seat 5 has a medium degree of adjustability; if the block 10 is installed in the third slot 703, the adjustable support seat 5 has the smallest degree of adjustability.

[0034] The method of using the above-mentioned anti-shock high-stability one-way valve to mitigate the impact is as follows:

[0035] Before using the one-way valve, the stopper 10 is installed in a suitable slot on the top of the valve cover 7 according to the specific working conditions on site to set the adjustable degree of the adjustable support seat 5, that is, the range of variation of the spring stiffness of the buffer spring 4.

[0036] At the moment of opening of the one-way valve, the gas medium enters the valve body 1 from the inlet channel, generating a downward force on the top of the valve disc 3. At the same time, the gas medium enters the second arc area through the pilot channel 2. Since the stopper 10 is fixedly connected to the valve cover 7, the gas medium acts on the thrust plate 601 to drive the transmission disc 6 to rotate, and compresses the return spring 9 at the same time, until the gas force is equal to the spring force of the return spring 9 and reaches a balance. During the rotation of the transmission disc 6, the torque is transmitted to the adjustable support seat 5 through the matching relationship between the polygonal convex plate 503 and the polygonal groove 602, so that the adjustable support seat 5 rotates and rises along the thread 502 on the valve body 1. During the rising process of the adjustable support seat 5, one end of the buffer spring 4 gradually slides out along the spring slide rail 501, thereby changing the support position of the buffer spring 4 and the adjustable support seat 5, reducing the effective force-bearing circles of the buffer spring 4, increasing the stiffness of the buffer spring 4, reducing the impact of the valve disc 3 on the adjustable support seat 5, improving the fatigue life of the valve disc 3, and increasing the stability of the opening process of the valve disc 3. In addition, since the adjustable support seat 5 rotates upward along the thread 502, the accelerated displacement of the valve flap 3 during the opening process is reduced, and the speed at which the valve flap 3 reaches the upper limit of the adjustable support seat 5 is further reduced, thereby reducing the impact of the valve flap 3 on the adjustable support seat 5. In other words, the one-way valve of the present invention achieves the function of reducing the impact through the increased spring stiffness and reduced accelerated displacement during the opening process.

[0037] After the one-way valve is opened, the gas medium will enter the first arc area from the second arc area along the gap between the thrust plate 601 and the valve body 1 under the action of the pressure difference. When the pressure at both ends of the thrust plate 601 is equal, the transmission disk 6 will return to the initial position under the action of the return spring 9, and at the same time drive the adjustable support seat 5 to rotate downward along the thread, so that the supporting position of the buffer spring 4 returns to the initial state, thereby achieving the final limit of the one-way valve and the purpose of keeping the maximum opening unchanged.

[0038] The present invention drives the transmission disk to rotate and change the position of the adjustable support seat through the gas pressure in front of the one-way valve to change the effective number of coils of the spring, thereby affecting the spring stiffness. The variable stiffness characteristic affected by the working conditions is used to reduce the impact of the valve disc on the support seat during the opening process of the one-way valve, thereby improving the fatigue life of the valve disc and increasing the stability of the opening process.

[0039] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A one-way valve with high impact resistance and stability, wherein the valve body (1) is provided with an inlet channel and an outlet channel, characterized in that: A valve disc (3) is installed in the middle valve cavity of the valve body (1); a valve stem fixedly connected to the bottom of the valve disc (3) and a first groove opened in the middle of the adjustable support seat (5) form a sliding pair to control the opening and closing of the one-way valve; a buffer spring (4) with axial preload is provided between the bottom of the valve disc (3) and the bottom of the first groove of the adjustable support seat (5); an arc-shaped spring slide rail (501) is provided at the bottom of the groove of the adjustable support seat (5); the adjustable support seat (5) and the inner wall of the valve body (1) are connected by a thread (502); one end of the buffer spring (4) is fixed to the bottom of the valve disc (3), and the other end is placed in the spring slide rail (501); by rotating the adjustable support seat (5), the buffer spring (4) can be moved along the spring slide rail (501) to change the effective force-bearing number of the buffer spring (4); a polygonal convex plate (503) is provided at the bottom of the adjustable support seat (5), and a plurality of springs (501) are opened on the transmission plate (6). The adjustable support seat (5) and the transmission disc (6) are connected to each other by a polygonal convex plate (503) and the polygonal groove (602), and the polygonal convex plate (503) can slide axially along the polygonal groove (602); the transmission disc (6) is rotatably connected to the valve cover (7), a stopper (10) is fixed on the top of the valve cover (7), and a thrust plate (601) is fixed on the bottom of the transmission disc (6), and the stopper (10) and the thrust plate (601) divide the annular area between the bottom of the transmission disc (6) and the top of the valve cover (7) into a first arc area and a second arc area; a return spring (9) at its original length in an initial state is provided in the first arc area; one end of the return spring (9) is fixedly connected to the thrust plate (601), and the other end is contact-connected to the stopper (10); the second arc area is connected to the inlet channel of the valve body (1) through the pilot channel (2).

2. The one-way valve with high impact resistance and stability according to claim 1, characterized in that: A first sealing ring (801) capable of forming a sealing connection with the valve body (1) is provided at the top of the valve flap (3), and a second sealing ring (802) for forming a sealing connection is provided between the valve cover (7) and the valve body (1).

3. The one-way valve with high impact resistance and stability according to claim 1, characterized in that: The spring slide rail (501) is a pipe section structure with a square hollow cross section.

4. The one-way valve with high impact resistance and stability according to claim 1, characterized in that: The polygonal convex plate (503) and the polygonal concave groove (602) are both cross-shaped structures.

5. The one-way valve with high impact resistance and stability according to claim 1, characterized in that: A cylindrical clamping shaft (603) is provided at the bottom of the transmission disc (6), and the transmission disc (6) is rotatably connected to the valve cover (7) via the clamping shaft (603).

6. The one-way valve with high impact resistance and stability according to claim 1, characterized in that: The valve cover (7), the transmission plate (6), the adjustable support seat (5), the valve stem and the valve flap (3) are all coaxially arranged.

7. The one-way valve with high impact resistance and stability according to claim 1, characterized in that: The top of the valve cover (7) is provided with a first slot (701), a second slot (702) and a third slot (703) spaced apart along the circumferential direction, and the stopper (10) can selectively connect with the first slot (701), the second slot (702) and the third slot (703) to change the rotation range of the adjustable support seat (5).

8. The one-way valve with high impact resistance and stability according to claim 1, characterized in that: The first arc-shaped area and the second arc-shaped area are connected via a gap between the thrust plate (601) and the valve body (1).

9. A method for mitigating impact using the one-way valve with high impact resistance and stability as claimed in any one of claims 1 to 8, characterized in that: The details are as follows: S1: When the one-way valve is opened, the gas medium enters the valve body (1) from the inlet channel, generating a downward force on the top of the valve disc (3); at the same time, the gas medium enters the second arc-shaped area through the pilot channel (2). Since the stopper (10) is fixedly connected to the valve cover (7), the gas medium acts on the thrust plate (601) to drive the transmission plate (6) to rotate, and compresses the return spring (9) at the same time, until the gas force is equal to the spring force of the return spring (9) and a balance is reached; During the rotation of the transmission disc (6), the torque is transmitted to the adjustable support seat (5) through the matching relationship between the polygonal convex plate (503) and the polygonal groove (602), so that the adjustable support seat (5) rotates and rises along the thread (502) on the valve body (1); during the rising process of the adjustable support seat (5), one end of the buffer spring (4) gradually slides out along the spring slide rail (501), thereby changing the supporting position of the buffer spring (4) and the adjustable support seat (5), reducing the effective force-bearing circles of the buffer spring (4), increasing the stiffness of the buffer spring (4), reducing the impact of the valve disc (3) on the adjustable support seat (5), improving the fatigue life of the valve disc (3), and increasing the stability of the valve disc (3) opening process; In addition, since the adjustable support seat (5) rotates upward along the thread (502), the accelerated displacement of the valve flap (3) during the opening process is reduced, and the speed at which the valve flap (3) reaches the upper limit position of the adjustable support seat (5) is further reduced, thereby reducing the impact of the valve flap (3) on the adjustable support seat (5); S2: After the one-way valve is opened, the gas medium enters the first arc zone from the second arc zone along the gap between the thrust plate (601) and the valve body (1) under the action of the pressure difference. When the pressures at both ends of the thrust plate (601) are equal, the transmission plate (6) returns to the initial position under the action of the return spring (9), and at the same time drives the adjustable support seat (5) to rotate downward along the thread (502), so that the support position of the buffer spring (4) returns to the initial state, thereby realizing the limit of the one-way valve and maintaining the maximum opening unchanged.

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