CN115435120A - Anti-impact high-stability one-way valve and method thereof - Google Patents

Abstract

The invention discloses an anti-impact high-stability one-way valve and a method thereof, and relates to the field of valve devices. The valve rod and a first groove formed in the middle of the adjustable support seat form a sliding pair, a buffer spring is arranged between the valve clack and the adjustable support seat, an arc-shaped spring slide rail is arranged at the bottom of the groove of the adjustable support seat, and the adjustable support seat is in threaded connection with the inner wall of the valve body; the adjustable supporting seat is connected with the transmission disc in a torque transmission manner; an 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 seat returning spring is arranged in the first arc-shaped area; the second arc-shaped area is communicated with the inlet channel of the valve body through the pilot channel. The invention changes the effective number of turns of the spring by pushing the transmission disc to rotate by the gas pressure in front of the check valve so as to change the position of the adjustable supporting seat, thereby influencing the rigidity of the spring, reducing the impact of the valve clack on the supporting seat in the opening process of the check valve by utilizing the variable rigidity characteristic influenced by the working condition, improving the fatigue life of the valve clack and increasing the stability in the opening process.

Description

Anti-impact high-stability one-way valve and method thereof

Technical Field

The invention belongs to the field of valve devices, and particularly relates to an impact-resistant high-stability one-way valve and a method thereof.

Background

The check valve is commonly called a check valve, wherein the medium can only flow along the inlet channel, but the medium can not flow back along the outlet channel. Check valves are also known as check valves or check valves. For use in hydraulic systems to prevent reverse flow of oil flow, or in pneumatic systems to prevent reverse flow of compressed air. Under the condition that the working conditions of an inlet and an outlet are changed violently, such as a check valve in a compressor system or a reciprocating pump system, frequent opening and closing are needed, so that the valve clack, a supporting disk and a valve seat are abraded, internal leakage of the check valve can be caused, and the valve clack can be damaged and broken in severe cases. Therefore, how to slow down the impact of the check valve on the supporting seat by the valve clack in the opening process, the fatigue life of the valve clack is prolonged, and the stability of the opening process is improved.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides an anti-impact high-stability one-way valve and a method thereof.

The invention adopts the following specific technical scheme:

in a first aspect, the invention provides an impact-proof high-stability one-way valve, wherein an inlet channel and an outlet channel are formed in a valve body, a valve clack is installed in a valve cavity in the middle of the valve body, and a valve rod fixedly connected with the bottom of the valve clack and a first groove formed in the middle of an adjustable supporting seat form a sliding pair so as to control the opening and closing of the one-way valve; a buffer spring with axial pretightening force is arranged between the bottom of the valve clack and the bottom of the first groove of the adjustable support seat, an arc-shaped spring slide rail is arranged at the bottom of the groove of the adjustable support seat, and the adjustable support seat is in threaded connection with the inner wall of the valve body; one end of the buffer spring is fixed at the bottom of the valve clack, the other end of the buffer spring is arranged in the spring slide rail, and the buffer spring can move along the spring slide rail by rotating the adjustable supporting seat so as to change the number of effective stressed circles of the buffer spring; a polygonal convex plate is arranged at the bottom of the adjustable supporting seat, a polygonal groove is formed in the transmission disc, torque transmission connection is realized between the adjustable supporting seat and the transmission disc through the polygonal convex plate and the polygonal groove, and the polygonal convex plate can axially slide along the polygonal groove; the transmission disc is rotatably connected with the valve cover, a stop block is fixed at the top of the valve cover, a thrust plate is fixed at the bottom of the transmission disc, and the stop block and the thrust plate divide an annular region between the bottom of the transmission disc and the top of the valve cover into a first arc-shaped region and a second arc-shaped region; a return seat spring which is in the original length under the initial state is arranged in the first arc-shaped area; one end of the return spring is fixedly connected with the thrust plate, and the other end of the return spring is in contact connection with the stop block; the second arc-shaped area is communicated with an inlet channel of the valve body through a pilot channel.

Preferably, a first sealing ring capable of forming sealing connection with the valve body is arranged at the top of the valve clack, and a second sealing ring used for forming sealing connection is arranged between the valve cover and the valve body.

Preferably, the spring slide rail is of a pipe section structure with a square hollow cross section.

Preferably, the polygonal convex plate and the polygonal concave groove are both in a cross-shaped structure.

Preferably, the bottom of the transmission disc is provided with a cylindrical clamping shaft, and the transmission disc is rotatably connected with the valve cover through the clamping shaft.

Preferably, the valve cover, the transmission disc, the adjustable supporting seat, the valve rod and the valve clack are coaxially arranged.

Preferably, the top of the valve cover is provided with a first clamping groove, a second clamping groove and a third clamping groove at intervals along the circumferential direction, and the stop block can be selectively connected with the first clamping groove, the second clamping groove and the third clamping groove to change the rotation range of the adjustable supporting seat.

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

In a second aspect, the invention provides a method for reducing impact by using the impact-resistant high-stability check valve in any one of the first aspects, which specifically comprises the following steps:

s1: when the check valve is opened, gas medium enters the valve body from the inlet passage, and downward acting force is generated on the top of the valve clack; meanwhile, the gas medium enters the second arc-shaped area through the pilot channel, and because the stop block is fixedly connected with the valve cover, the gas medium acts on the thrust plate to drive the transmission disc to rotate and simultaneously press the return seat spring until the gas force is equal to the spring force of the return seat spring, so that the balance is achieved;

in the rotating process of the transmission disc, the torque is transmitted to the adjustable supporting seat through the matching relation of the polygonal convex plate and the polygonal groove, so that the adjustable supporting seat rotates and rises along the thread on the valve body; in the ascending process of the adjustable supporting seat, one end of the buffer spring gradually slides out along the spring slide rail, so that the supporting positions of the buffer spring and the adjustable supporting seat are changed, the number of effective stressed circles of the buffer spring is reduced, the rigidity of the buffer spring is increased, the impact of the valve clack on the adjustable supporting seat is reduced, the fatigue life of the valve clack is prolonged, and the stability of the valve clack in the opening process is improved;

in addition, the adjustable support seat rotates upwards along the thread, so that the acceleration displacement of the valve clack in the opening process is reduced, the speed of the valve clack reaching the upper limit position of the adjustable support seat is further reduced, and the impact of the valve clack on the adjustable support seat is reduced;

s2: after the check valve is opened, 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 pressure difference, when the pressures at the two ends of the thrust plate are equal, the transmission disc returns to the initial position under the action of the seat returning spring, and meanwhile, the adjustable supporting seat is driven to rotate downwards along the threads, so that the supporting position of the buffer spring returns to the initial state, the limit of the check valve is realized, and the maximum opening degree is kept unchanged.

Compared with the prior art, the invention has the following beneficial effects:

the invention mainly realizes the buffer function in the opening process of the check valve through two aspects: 1) The gas pressure in front of the one-way valve pushes the transmission disc to rotate to change the position of the adjustable supporting seat, so that the effective number of turns of the buffer spring is changed, and the rigidity of the buffer spring is influenced; 2) The variable stiffness characteristic influenced by the working condition is utilized to reduce the impact of the valve clack on the adjustable supporting seat in the opening process of the check valve, the fatigue life of the valve clack is prolonged, and the stability of the opening process is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a check valve;

FIG. 2 is a schematic three-dimensional structure of the check valve;

FIG. 3 is a schematic diagram of a three-dimensional structure of a thrust mechanism (including a transmission disc, a return seat spring and a stopper) of the check valve;

FIG. 4 is a schematic diagram of a three-dimensional structure of a variable stiffness spring mechanism (including a valve flap, a buffer spring, and an adjustable support seat);

FIG. 5 is a schematic diagram of an assembled three-dimensional structure of a variable stiffness spring mechanism and a thrust mechanism;

FIG. 6 is a schematic diagram of an assembled three-dimensional structure of the thrust mechanism and the valve cover;

in the figure: 1. a valve body; 2. a pilot channel; 3. a valve clack; 4. a buffer spring; 5. an adjustable support seat; 6. a transmission disc; 7. a valve cover; 801. a first seal ring; 802. a second seal ring; 9. a return spring; 10. a stopper; 501. a spring slide rail; 502. a thread; 503. a polygonal convex plate; 601. a thrust plate; 602. a polygonal groove; 603. clamping a shaft; 701 a first card slot; 702. a second card slot; 703. and a third card slot.

Detailed Description

The invention is further illustrated and described below with reference to the drawings and the detailed description. The technical features of the embodiments of the present invention can be combined correspondingly without mutual conflict.

As shown in fig. 1 and 2, for the impact-proof high-stability check valve provided by the invention, an inlet channel and an outlet channel are formed on a valve body 1, and a valve clack 3 for controlling the opening and closing of the check valve is installed in a middle valve cavity of the valve body 1. The flap 3 position, as shown in figure 1, is a one-way valve closed state. The valve rod is fixed at the bottom of the valve clack 3, the first groove is formed in the middle of the adjustable supporting seat 5, and the valve rod and the first groove jointly form a sliding pair for controlling the opening and closing of the one-way valve. A buffer spring 4 is arranged between the bottom of the valve clack 3 and the bottom of the first groove of the adjustable supporting seat 5, and the buffer spring 4 has axial pre-tightening force capable of stretching along the direction of the valve rod. As shown in fig. 4, the bottom of the groove of the adjustable support seat 5 is provided with a curved spring slide 501, and the position and angle of the slide 501 are consistent with those of the adjacent buffer spring 4. One end of the buffer spring 4 is fixed at the bottom of the valve clack 3, the other end of the buffer spring is arranged in the spring slide rail 501, the buffer spring 4 can move along the spring slide rail 501 by rotating the adjustable supporting seat 5, the length of the buffer spring 4 leaking out of the spring slide rail 501 is changed, and the number of effective stress circles of the buffer spring 4 is further changed. The adjustable supporting seat 5 is connected with the inner wall of the valve body 1 through the threads 502, and when the adjustable supporting seat 5 rotates, the valve body 1 can move up and down along the threads 502. In this embodiment, the spring slide 501 may be provided as a tube segment structure having a square hollow cross-section.

The bottom of the adjustable supporting seat 5 is provided with a polygonal convex plate 503, the transmission disc 6 is provided with a polygonal groove 602, and the polygonal convex plate 503 and the polygonal groove 602 are connected in a matching manner, so that torque transmission connection is realized between the adjustable supporting seat 5 and the transmission disc 6 through the polygonal convex plate 503 and the polygonal groove 602, and the polygonal convex plate 503 can axially slide along the polygonal groove 602. As shown in fig. 3 and 4, in the present embodiment, both the polygonal protruding plate 503 and the polygonal groove 602 may be provided in a cross-shaped configuration. In practical application, the polygonal convex plate 503 transmits torque to drive the adjustable support base 5 to rotate and move up and down along the thread, so that the position of the buffer spring 4 in the spring slide rail 501 is changed, the effective number of turns of the buffer spring 4 is changed, and the rigidity of the buffer spring 4 is affected.

As shown in fig. 6, the transmission disc 6 is rotatably connected with the valve cover 7, the stopper 10 is fixed at the top of the valve cover 7, the thrust plate 601 is fixed at the bottom of the transmission disc 6, the stopper 10 and the thrust plate 601 divide an annular region between the bottom of the transmission disc 6 and the top of the valve cover 7 into a first arc-shaped region and a second arc-shaped region, and both the first arc-shaped region and the second arc-shaped region are relatively closed. Specifically, in order to reset the adjustable support seat 5 and the transmission disc 6, a certain communication gap should be left between the first arc-shaped area and the second arc-shaped area, for example, a certain gap may be left between the thrust plate 601 and the valve body 1, so that the first arc-shaped area and the second arc-shaped area are communicated with each other through the gap between the thrust plate 601 and the valve body 1.

As shown in fig. 5, the first arc-shaped area is provided with a return spring 9 which is in an original length state. One end of the return spring 9 is fixedly connected with the thrust plate 601, and the other end is in contact connection with the stopper 10. The second arc-shaped area is communicated with the inlet channel of the valve body 1 through the pilot channel 2. In practical application, the gas medium acts on the thrust plate 601 to drive the transmission disc 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, so that the adjustable support seat 5 rotates along the thread to realize up-and-down movement, and meanwhile, 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 disc 6.

In this embodiment, a groove is formed in the top of the valve flap 3, a first sealing ring 801 is placed in the groove, the valve flap 3 can be in sealing connection with the valve body 1 through the first sealing ring 801, and then the sealing performance between the valve flap 3 and the valve body 1 when the valve flap 3 is closed is realized. A second sealing ring 802 for forming sealing connection is arranged between the valve cover 7 and the valve body 1, so that gas is prevented from leaking from the connection part of the valve cover 7 and the valve body 1. As shown in fig. 5, a cylindrical shaft 603 is disposed at the bottom of the transmission disc 6, and the transmission disc 6 is rotatably connected to the valve cover 7 through the shaft 603. In order to improve the working performance of the check valve, the valve cover 7, the transmission disc 6, the adjustable supporting seat 5, the valve rod and the valve clack 3 are preferably coaxially arranged. As shown in fig. 6, in order to change the rotation range of the adjustable support seat 5 and further the change range of the spring stiffness of the buffer spring 4 according to the magnitude of the air pressure in the inlet channel, a first locking groove 701, a second locking groove 702 and a third locking groove 703 may be circumferentially spaced at the top of the valve cover 7, and the stopper 10 may be selectively connected to the first locking groove 701, the second locking groove 702 and the third locking groove 703 to change the rotation range of the adjustable support seat 5. In fact, the number of the clamping grooves formed in the top of the valve cover 7 can be other numbers, and the number of the clamping grooves can be adjusted according to actual conditions, which is not described herein again.

Taking the slot position shown in fig. 6 as an example, if the introduced gas pressure is large, the stopper 10 may be placed in the first slot 701, the length and the expansion range of the recoil spring 9 are large, the rotation range of the adjustable support seat 5 driven by the gas pressure is also large, the range of the length of the part of the buffer spring 4 extending out of the spring slide rail 501 is also large, and then the variation range of the spring stiffness is also large, so that the buffer effect can be better played. If the stopper 10 is installed in the first engaging groove 701, the adjustable supporting seat 5 has the maximum adjustable degree; if the stopper 10 is installed in the second engaging groove 702, the adjustable supporting seat 5 has a moderate adjustable degree; if the stopper 10 is installed in the third groove 703, the adjustable support base 5 has a minimum degree of adjustability.

The impact method for slowing down the impact by using the anti-impact high-stability one-way valve comprises the following specific steps:

before the check valve is used, the check block 10 is installed in a proper clamping groove in the top of the valve cover 7 according to specific site working conditions so as to set the adjustable degree of the adjustable supporting seat 5, namely the change range of the spring stiffness of the buffer spring 4.

When the check valve is opened, the gas medium enters the valve body 1 from the inlet passage, and downward acting force is generated on the top of the valve clack 3. Meanwhile, the gas medium enters the second arc-shaped area through the pilot channel 2, and because the stop block 10 is fixedly connected with the valve cover 7, the gas medium acts on the thrust plate 601 to drive the transmission disc 6 to rotate, and meanwhile, the gas medium is compressed back to the seat spring 9 until the gas force is equal to the spring force of the seat spring 9, so that the gas force is balanced. 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 concave groove 602, so that the adjustable support seat 5 rotates and rises along the thread 502 on the valve body 1. At the ascending in-process of adjustable support seat 5, buffer spring 4's one end slides out along spring slide rail 501 gradually to change buffer spring 4 and adjustable support seat 5's support position, reduce buffer spring 4's effective atress number of turns, increase buffer spring 4's rigidity reduces the impact of valve clack 3 to adjustable support seat 5, improves the fatigue life of valve clack 3, and increase valve clack 3 opens process stability. In addition, because the adjustable support seat 5 rotates upwards along the thread 502, the acceleration displacement of the valve clack 3 in the opening process is reduced, the speed of the valve clack 3 reaching the upper limit position of the adjustable support seat 5 is further reduced, and the impact of the valve clack 3 on the adjustable support seat 5 is reduced. That is, the check valve of the present invention accomplishes the shock-absorbing function by both an increased spring rate and a reduced acceleration displacement during the opening process.

After the check valve is opened, gas media can 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 pressure difference, when the pressures at the two ends of the thrust plate 601 are equal, the transmission disc 6 can return to the initial position under the action of the seat returning spring 9, and simultaneously drives the adjustable support seat 5 to rotate downwards along the thread, so that the support position of the buffer spring 4 returns to the initial state, and the purposes of final limiting of the check valve and unchanged maximum opening degree are achieved.

The invention changes the effective number of turns of the spring by pushing the transmission disc to rotate by the gas pressure in front of the check valve so as to change the position of the adjustable supporting seat, thereby influencing the rigidity of the spring, reducing the impact of the valve clack on the supporting seat in the opening process of the check valve by utilizing the variable rigidity characteristic influenced by the working condition, improving the fatigue life of the valve clack and increasing the stability in the opening process.

The above-described embodiments are merely preferred embodiments of the present invention, and are not intended to limit the present invention. Various changes and modifications may be made by one of ordinary skill in the pertinent art without departing from the spirit and scope of the present invention. Therefore, the technical solutions obtained by means of equivalent substitution or equivalent transformation all fall within the protection scope of the present invention.

Claims (9)

1. A one-way valve with impact resistance and high stability is characterized in that a valve clack (3) is installed in a valve cavity in the middle of the valve body (1), and a valve rod fixedly connected with the bottom of the valve clack (3) and a first groove formed in the middle of an adjustable supporting seat (5) form a sliding pair to control the opening and closing of the one-way valve; a buffer spring (4) with axial pretightening force is arranged between the bottom of the valve clack (3) and the bottom of a first groove of the adjustable support seat (5), an arc-shaped spring slide rail (501) is arranged at the bottom of the groove of the adjustable support seat (5), and the adjustable support seat (5) is connected with the inner wall of the valve body (1) through a thread (502); one end of the buffer spring (4) is fixed at the bottom of the valve clack (3), the other end of the buffer spring (4) is arranged in the spring slide rail (501), and the buffer spring (4) can move along the spring slide rail (501) by rotating the adjustable supporting seat (5) so as to change the number of effective stress circles of the buffer spring (4); a polygonal convex plate (503) is arranged at the bottom of the adjustable supporting seat (5), a polygonal groove (602) is formed in the transmission disc (6), torque transmission connection is realized between the adjustable supporting seat (5) and the transmission disc (6) through the polygonal convex plate (503) and the polygonal groove (602), and the polygonal convex plate (503) can axially slide along the polygonal groove (602); the transmission disc (6) is rotatably connected with the valve cover (7), a stop block (10) is fixed at the top of the valve cover (7), a thrust plate (601) is fixed at the bottom of the transmission disc (6), and the stop block (10) and the thrust plate (601) divide an annular area between the bottom of the transmission disc (6) and the top of the valve cover (7) into a first arc-shaped area and a second arc-shaped area; a return seat spring (9) which is in the original length under the initial state is arranged in the first arc-shaped area; one end of the return seat spring (9) is fixedly connected with the thrust plate (601), and the other end of the return seat spring is in contact connection with the stop block (10); the second arc-shaped area is communicated with an inlet channel of the valve body (1) through a pilot channel (2).

2. An impact-resistant high-stability one-way valve according to claim 1, wherein a first sealing ring (801) capable of forming a sealing connection with the valve body (1) is arranged at the top of the valve flap (3), and a second sealing ring (802) for forming a sealing connection is arranged between the valve cover (7) and the valve body (1).

3. An impact-proof high-stability one-way valve according to claim 1, wherein the spring sliding rail (501) is of a pipe section structure with a square hollow cross section.

4. An impact-resistant high-stability one-way valve according to claim 1, wherein the polygonal convex plate (503) and the polygonal concave groove (602) are both in a cross-shaped structure.

5. An impact-proof high-stability one-way valve according to claim 1, wherein a cylindrical clamping shaft (603) is arranged at the bottom of the transmission disc (6), and the transmission disc (6) is rotatably connected with the valve cover (7) through the clamping shaft (603).

6. An impact-resistant high-stability one-way valve according to claim 1, wherein the valve cover (7), the transmission disc (6), the adjustable support seat (5), the valve rod and the valve flap (3) are coaxially arranged.

7. An impact-proof high-stability one-way valve according to claim 1, wherein the top of the valve cover (7) is provided with a first clamping groove (701), a second clamping groove (702) and a third clamping groove (703) at intervals along the circumferential direction, and the stop block (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).

8. An impact-resistant high-stability one-way valve according to claim 1, wherein the first arc-shaped area and the second arc-shaped area are communicated with the valve body (1) through a gap between the thrust plate (601) and the valve body.

9. A method for reducing impact by using the impact-resistant high-stability one-way valve as claimed in any one of claims 1 to 8 is characterized by comprising the following steps:

s1: when the check valve is opened, gas medium enters the valve body (1) from the inlet channel, and downward acting force is generated on the top of the valve clack (3); meanwhile, the gas medium enters the second arc-shaped area through the pilot channel (2), and because the stop block (10) is fixedly connected with the valve cover (7), the gas medium acts on the thrust plate (601) to drive the transmission disc (6) to rotate and simultaneously presses the seat return spring (9) until the gas force is equal to the spring force of the seat return spring (9) to achieve balance;

in the rotating process of the transmission disc (6), the torque is transmitted to the adjustable supporting seat (5) through the matching relation of the polygonal convex plate (503) and the polygonal groove (602), so that the adjustable supporting seat (5) rotates and rises along the thread (502) on the valve body (1); in the ascending process of the adjustable supporting seat (5), one end of the buffer spring (4) gradually slides out along the spring sliding rail (501), so that the supporting positions of the buffer spring (4) and the adjustable supporting seat (5) are changed, the number of effective stressed circles of the buffer spring (4) is reduced, the rigidity of the buffer spring (4) is increased, the impact of the valve clack (3) on the adjustable supporting seat (5) is reduced, the fatigue life of the valve clack (3) is prolonged, and the stability of the valve clack (3) in the opening process is improved;

in addition, the adjustable support seat (5) rotates upwards along the thread (502), so that the acceleration displacement of the valve clack (3) in the opening process is reduced, the speed of the valve clack (3) reaching the upper limiting position of the adjustable support seat (5) is further reduced, and the impact of the valve clack (3) on the adjustable support seat (5) is reduced;

s2: after the check valve is opened, gas medium enters the first arc-shaped area from the second arc-shaped area along the gap between the thrust plate (601) and the valve body (1) under the action of pressure difference, when the pressures at the two ends of the thrust plate (601) are equal, the transmission disc (6) returns to the initial position under the action of the seat returning spring (9), and meanwhile, the adjustable support seat (5) is driven to rotate downwards along the thread (502), so that the support position of the buffer spring (4) returns to the initial state, the limit of the check valve is realized, and the maximum opening degree is kept unchanged.

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