A drip-proof opening and closing buffer check valve

Abstract

The present invention discloses an anti-drip opening and closing buffer check valve, comprising a valve body, a valve seat, a valve disc, a piston, a spring and a valve cover, wherein the valve body comprises two upper and lower chambers, a piston is arranged in a cylinder, a valve cover is arranged on the top of the cylinder, a reset spring is arranged in the cylinder, an air hole is arranged on the valve cover, the air hole connects the cylinder and the air outside the valve body, the end of the piston is connected to the valve disc through a connecting piece, and air enters into the cylinder cavity through the air hole during the downward movement of the piston in the cylinder, and the air hole plays a role of slowly closing the valve, which can eliminate the water hammer phenomenon, and a self-locking clamping mechanism is also arranged in the valve body, which utilizes a cam rocker mechanism to convert a large deformation of the spring into a small deformation of the valve disc, and the corresponding force will be amplified, and the self-locking mechanism has a self-locking property, which can effectively improve the reliability of the seal.

Description

Technical Field

[0001] The invention relates to the technical field of one-way valves, in particular to an anti-drip opening and closing buffer check valve. Background Art

[0002] Existing check valves usually have a valve disc that can rotate or move linearly set in the valve body, and use the pressure difference between the water inlet and the water outlet to drive the valve disc to move relative to the valve seat, thereby completing the automatic opening and closing of the valve to achieve the purpose of checking.

[0003] The clamping force and sealing degree between the valve disc and the valve seat are positively correlated. In order to improve the sealing degree of the valve and prevent the problem of small flow backflow due to poor sealing degree when the negative pressure difference between the inlet and outlet is small, the conventional solution is to apply spring force or counterweight on the valve disc. Although the above solution can improve the sealing degree to a certain extent, the negative impact brought about by this is that the valve opening first needs to overcome the preload force provided by the spring or counterweight before the valve can be opened, and the resistance brought by the spring or counterweight still needs to be overcome during the opening process. For the solution of setting the spring, the resistance will increase with the increase of the opening amount, and this part of the resistance is of no benefit, but will reduce the pressure at the outlet end. Therefore, the clamping spring force cannot be selected too large, otherwise it cannot guarantee the normal opening of the valve when the positive pressure difference between the inlet and outlet is small, and if the clamping spring force is small, it cannot guarantee the sealing problem of the valve when the negative pressure difference between the inlet and outlet is small; for the method of using the counterweight, although the problem of increased resistance is avoided by setting the rotation angle of the counterweight, there are requirements for the installation level, which is not conducive to miniaturization.

[0004] Patent publication number CN103062448A discloses a drip-proof check valve, which increases the preload by arranging magnetic parts on the valve disc and valve seat. During the opening process, the magnetic attraction between the valve disc and the valve seat will weaken as the distance increases, which is an improvement on the existing technology. However, the magnetism of the magnet will gradually weaken during use, and the sealing degree will also decrease accordingly.

[0005] In addition, if the valve flap is opened and closed too quickly, water hammer will occur. Water hammer occurs when there is a sudden power outage or the valve is closed too quickly. Due to the inertia of the pressure water flow, a water shock wave is generated, just like a hammer hitting, so it is called water hammer. The force generated by the water shock wave back and forth can sometimes be very large, thus damaging the valve and water pump. Summary of the invention

[0006] The purpose of the present invention is to provide an anti-drip opening and closing buffer check valve to eliminate the water hammer problem and solve the problem that the compression spring force acting on the valve disc is too large, which will cause the valve to fail to open normally when the inlet and outlet pressure difference is positive, and too small a spring force cannot ensure the sealing of the valve when the inlet and outlet pressure difference is negative. A check valve that prevents backflow and dripping and has self-locking function in a sealed state is designed for working conditions with a small inlet and outlet pressure difference.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A drip-proof opening and closing buffer check valve comprises a valve body, a valve seat, a valve disc, a piston, a spring and a valve cover. The valve body comprises two upper and lower chambers, which are respectively a water inlet chamber and a water outlet chamber. A valve seat is fixedly arranged at the connection of the two chambers. A cylinder is arranged above the water outlet chamber. A piston is arranged in the cylinder. A valve cover is arranged on the top of the cylinder. A return spring is arranged in the cylinder. The two ends of the return spring respectively abut against the valve cover and the piston. An air hole is arranged on the valve cover. The air hole communicates the cylinder with the air outside the valve body. The end of the piston is connected to the valve disc through a connecting piece. The valve disc has the same degree of freedom as the piston. A sealing gasket is arranged at the junction of the valve disc and the valve seat. The cross-sectional area of ​​the cylinder is larger than the cross-sectional area of ​​the flow hole of the valve seat.

[0009] The working principle of the anti-drip opening and closing buffer check valve is as follows: the purpose of valve opening and closing is achieved through the cooperation of the valve disc and the valve seat. When the pressure difference between the water inlet chamber and the water outlet chamber is zero or negative, that is, the pressure in the water inlet chamber is less than the pressure in the water outlet chamber, the piston moves downward under the action of the reset spring, driving the valve disc to move downward and fit with the valve seat. The reset spring provides a pre-compression force to ensure the sealing between the valve disc and the valve seat. The water inlet chamber and the water outlet chamber are cut off and connected, and the valve is in a closed state; when the pressure difference between the water inlet chamber and the water outlet chamber is positive, that is, the pressure in the water inlet chamber is greater than the pressure in the water outlet chamber, the valve disc is subjected to the pressure of the water inlet chamber, the pressure of the water outlet chamber and the force of the reset spring. When the pressure of the water inlet chamber is greater than the sum of the pressure of the water outlet chamber and the force of the reset spring, the valve disc is lifted up and the valve is opened. During the downward movement of the piston in the cylinder, air will enter the cylinder cavity through the air hole. By adjusting the aperture of the air hole, the movement speed of the piston can be controlled, thereby playing the role of slowly closing the valve and eliminating the water hammer phenomenon.

[0010] In order to further improve the sealing between the valve disc and the valve seat, a self-locking pressing mechanism is also provided in the valve body.

[0011] The self-locking clamping mechanism converts the large deformation of the spring into a small deformation of the valve disc through the cam rocker mechanism, and the corresponding force will be amplified, thereby improving the sealing effect and having self-locking properties.

[0012] The beneficial effects of the present invention are:

[0013] The present invention can control the moving speed of the piston by adjusting the aperture of the air hole, thereby playing the role of slowly closing the valve and eliminating the water hammer phenomenon. In addition, the cam rocker mechanism converts the large deformation of the spring into a small deformation of the valve disc, and the corresponding force will be amplified, and it has self-locking properties, and can effectively improve the reliability of the seal without increasing the compression spring force. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 It is a structural schematic diagram of the non-return component of the present invention in the open state.

[0016] Figure 2 for Figure 1 A partial enlarged view of .

[0017] Figure 3 It is a structural schematic diagram of the critical closing state of the non-return component of the present invention.

[0018] Figure 4 for Figure 3 A partial enlarged view of .

[0019] Figure 5 It is a structural schematic diagram of the locking state of the non-return component of the present invention.

[0020] Figure 6 for Figure 5 A partial enlarged view of .

[0021] In the figure: 1--valve body; 2--valve seat; 3--valve disc; 4--piston; 5--reset spring; 6--valve cover; 7--air hole; 8--cylinder; 9--self-locking clamping mechanism; 901--sleeve; 9011--slideway; 902--telescopic shaft; 903--flexible sealing disk; 904--compression spring; 905--slider; 906--rocker; 9061--elastic reset member; 907--guide clamping block. DETAILED DESCRIPTION

[0022] like Figure 1 and 3As shown, a drip-proof opening and closing buffer check valve comprises a valve body 1, a valve seat 2, a valve disc 3, a piston 4, a spring 5 and a valve cover 6. The valve body 1 comprises two upper and lower chambers, which are a water inlet chamber and a water outlet chamber respectively. A valve seat 2 is fixedly arranged at the connection between the two chambers, a cylinder 8 is arranged above the water outlet chamber, a piston 4 is arranged in the cylinder 8, a valve cover 6 is arranged on the top of the cylinder 8, a return spring 5 is arranged in the cylinder 8, and two ends of the return spring 5 respectively abut against the valve cover 6 and the piston 4, an air hole 7 is arranged on the valve cover 6, and the air hole 7 connects the cylinder 8 and the air outside the valve body, the end of the piston 4 is connected to the valve disc 3 through a connecting piece, the valve disc 3 has the same degree of freedom as the piston 4, and a sealing gasket is arranged at the junction of the valve disc 3 and the valve seat 2.

[0023] The working principle of the anti-drip opening and closing buffer check valve is as follows: the purpose of valve opening and closing is achieved through the cooperation of the valve disc 3 and the valve seat 2. When the pressure difference between the water inlet chamber and the water outlet chamber is zero or a negative value, that is, the pressure in the water inlet chamber is less than the pressure in the water outlet chamber, the piston 4 moves downward under the action of the return spring 5, driving the valve disc 3 to move downward and fit with the valve seat 2. The return spring 5 provides a pre-compression force to ensure the sealing degree between the valve disc 3 and the valve seat 2. The water inlet chamber and the water outlet chamber are cut off and connected, and the valve is in a closed state; when the pressure difference between the water inlet chamber and the water outlet chamber is a positive value, that is, the pressure in the water inlet chamber is greater than the pressure in the water outlet chamber, the valve disc 3 is subjected to the action of the water inlet chamber pressure, the water outlet chamber pressure and the return spring 5. When the water inlet chamber pressure is greater than the sum of the water outlet chamber pressure and the action of the return spring 5, the valve disc 3 is lifted up and the valve is opened. When the piston 4 moves downward in the cylinder 8, air will enter the cavity of the cylinder 8 through the air hole 7. By adjusting the aperture of the air hole 7, the movement speed of the piston 4 can be controlled, thereby playing the role of slowly closing the valve and eliminating the water hammer phenomenon.

[0024] The cross-sectional area of ​​the cylinder 8 is larger than the cross-sectional area of ​​the flow hole of the valve seat 2, so that the valve flap 3 and the piston 4 as a whole are directed toward the valve seat 2 by the combined force of the hydraulic pressure in the water outlet chamber, which can ensure that as the pressure difference between the water outlet chamber and the water inlet chamber increases, the clamping force between the valve flap 3 and the piston 4 will increase, thereby ensuring the reliability of the seal.

[0025] In order to further improve the sealing degree between the valve disc 3 and the valve seat 2 , a self-locking pressing mechanism 9 is further provided in the valve body 1 .

[0026] Furthermore, the self-locking clamping mechanism 9 includes a sleeve 901, a telescopic shaft 902, a flexible sealing disk 903, a compression spring 904, a slider 905, a rocker rod 906 and a guide clamping block 907. The sleeve 901 is a hollow sleeve, and its two ends are respectively connected to the piston 4 and the valve disc 3. A telescopic shaft 902 is arranged in the sleeve 901, and the telescopic shaft 902 can slide axially in the sleeve 901. The end of the telescopic shaft 902 extends out of the valve disc 3 and is fixedly connected to the center of the flexible sealing disk 903 arranged under the valve disc 3. The flexible sealing disk 903 is deformable, and its edge is located between the valve disc 3 and the valve seat 2. A compression spring 904 is arranged between the flexible sealing disk 903 and the valve disc 3. Under the action of the compression spring 904, the flexible sealing disk 903 is in an arched state. The elastic force of the compression spring 904 is less than the reset spring 5. A slide groove 9 is arranged on the sleeve 901. 011, a slider 905 is fixedly arranged on the telescopic shaft 902, and the slider 905 extends out from the slide groove 9011 on the sleeve 901, and a rocker arm 906 is arranged on the outside of the sleeve 901, and the rocker arm 906 is hinged and fixed relative to the sleeve 901, and an elastic reset member 9061 is arranged on the rocker arm 906, the inner side of the rocker arm 906 is a curved surface with a recessed portion, and the outer side of the rocker arm 906 is a plane, and the movement of the slider 905 will trigger the rocker arm 906 to swing, and a guide clamping block 907 fixed relative to the valve seat 2 is arranged on the outer side of the rocker arm 906, and an arc-shaped guide surface is arranged below the guide clamping block 907, and during the swinging process of the rocker arm 906, the arc-shaped guide surface of the guide clamping block 907 cooperates with the top end of the rocker arm 906, and the end of the distance from the arc-shaped guide surface of the guide clamping block 907 to the hinge point of the rocker arm 906 is smaller than the initial end.

[0027] The working principle of the self-locking clamping mechanism 9 is as follows: Figure 1 and 2 As shown, in the initial state, the valve disc 3 is open and the reset spring 5 is compressed. Since the elastic force of the compression spring 904 is smaller than that of the reset spring 5, the compression spring 904 must be in a compressed state, and the flexible sealing disk 903 is flat. The telescopic shaft 902 is pushed to the uppermost end relative to the sleeve 901. At this time, the slider 905 is located at the uppermost end of the slide groove 9011, and the slider 905 falls into the recessed part of the rocker arm 906. The rocker arm 906 is in a retracted state under the action of the elastic reset member 9061, and there is no interaction force between the slider 905 and the rocker arm 906, and between the rocker arm 906 and the guide clamping block 907. When the pressure difference between the water inlet chamber and the water outlet chamber is zero or negative, that is, the pressure in the water inlet chamber is lower than the pressure in the water outlet chamber, since the elastic force of the compression spring 904 is lower than the return spring 5, the return spring 5 takes precedence, and the piston 4 moves downward under the action of the return spring 5, and accordingly drives the sleeve 901, the telescopic shaft 902, the valve disc 3, the flexible sealing disc 903 and the rocker arm 906 to move downward as a whole until the flexible sealing disc 903 contacts the valve seat 2. At this time, the state is as follows: Figure 3 and 4As shown, the pressure between the flexible sealing disc 903 and the valve seat 2 is provided by the reset spring 5, and the sealing degree is weak. At this time, the valve disc 3 is restricted by the valve seat 2 and cannot move, and the top end of the rocker arm 906 enters the arc-shaped guide surface area of ​​the guide clamping block 907, the compression spring 904 begins to release, the slider 905 squeezes the rocker arm 906, the rocker arm 906 flips outward, and the top end of the rocker arm 906 moves along the arc-shaped guide surface of the guide clamping block 907. Since the end of the distance from the arc-shaped guide surface of the guide clamping block 907 to the hinge point of the rocker arm 906 is smaller than the initial end, the rocker arm 906 will generate a downward component force during the outward flipping process, and the state is as shown in FIG. Figure 5 and 6 As shown, the force component will act on the junction of the flexible sealing disc 903 and the valve seat 2 through the valve disc 3, and has self-locking properties, which can effectively improve the stability of the seal and prevent backflow and dripping. The core is that the large deformation of the compression spring 904 is converted into a small deformation of the valve disc 3 through the cam rocker mechanism, and the corresponding force will be amplified, and the amplified force is used to compress the flexible sealing disc 903, thereby improving the sealing effect.

[0028] On the contrary, when the pressure difference between the water inlet chamber and the water outlet chamber is positive, that is, when the pressure in the water inlet chamber is greater than the pressure in the water outlet chamber, the water inlet chamber pressure first pushes the flexible sealing disk 903 to move, and the corresponding telescopic shaft 902 drives the slider 905 to move upward, the swing rod 906 is retracted, and the swing rod 906 is separated from the guide pressing block 907, the locking state is released, and the state is restored to Figure 3 and 4 After that, the sleeve 901, the telescopic shaft 902, the valve disc 3, the flexible sealing disc 903 and the swing rod 906 move upward as a whole, and the valve is opened. This solution can effectively improve the reliability of the seal without increasing the elastic force of the return spring 5.

[0029] Preferably, the elastic return member 9061 is a torsion spring.

[0030] Preferably, a roller is provided at the end of the swing rod 906, and the friction between the swing rod 906 and the guide pressing block 907 during the swinging process is rolling friction, which reduces resistance.

[0031] Preferably, a roller is provided at the initial end of the guide clamping block 907. When the pressure difference between the water inlet chamber and the water outlet chamber changes suddenly, the reset spring 5 and the compression spring 904 may act simultaneously. At this time, the guide clamping block 907 contacts the outer wall of the rocker arm 906. Providing a roller here can effectively avoid the occurrence of jamming.

[0032] The above disclosure is only a specific embodiment of the present invention, but the present invention is not limited thereto. For ordinary technicians in this field, without departing from the principle of the present invention, the modifications made should be deemed to belong to the protection scope of the present invention.

Claims

1. A drip-proof opening and closing buffer check valve, comprising a valve body (1), a valve seat (2), a valve disc (3), a piston (4), a spring (5) and a valve cover (6), wherein the valve body (1) comprises two upper and lower chambers, namely a water inlet chamber and a water outlet chamber, and a valve seat (2) is fixedly arranged at the connection between the two chambers, characterized in that: A cylinder (8) is arranged above the water outlet chamber, a piston (4) is arranged in the cylinder (8), a valve cover (6) is arranged on the top of the cylinder (8), a return spring (5) is arranged in the cylinder (8), the two ends of the return spring (5) respectively abut against the valve cover (6) and the piston (4), an air hole (7) is arranged on the valve cover (6), the air hole (7) communicates with the cylinder (8) and the air outside the valve body, the end of the piston (4) is connected to the valve disc (3) through a connecting piece, the valve disc (3) has the same degree of freedom as the piston (4), a sealing gasket is arranged at the junction of the valve disc (3) and the valve seat (2), the cross-sectional area of ​​the cylinder (8) is larger than the cross-sectional area of ​​the flow hole of the valve seat (2), and a gasket (7) is arranged in the valve body (1). A self-locking clamping mechanism (9) is provided, and the self-locking clamping mechanism (9) comprises a sleeve (901), a telescopic shaft (902), a flexible sealing disc (903), a compression spring (904), a slider (905), a rocker rod (906), and a guide clamping block (907). The sleeve (901) is a hollow sleeve, and its two ends are respectively connected to the piston (4) and the valve disc (3). A telescopic shaft (902) is provided in the sleeve (901), and the telescopic shaft (902) can slide axially in the sleeve (901). The end of the telescopic shaft (902) extends out of the valve disc (3) and is fixedly connected to the center of the flexible sealing disc (903) provided below the valve disc (3). The flexible sealing disc (903) is deformable, and its edge is located between the valve disc (3) and the valve seat (2). A compression spring (904) is arranged between the flexible sealing disc (903) and the valve disc (3). Under the action of the compression spring (904), the flexible sealing disc (903) is in an arched state. The elastic force of the compression spring (904) is smaller than that of the return spring (5). A slide groove (9011) is arranged on the sleeve (901). A slider (905) is fixedly arranged on the telescopic shaft (902). The slider (905) extends from the slide groove (9011) on the sleeve (901). A swing rod (906) is arranged on the outside of the sleeve (901). The swing rod (906) is hinged and fixed relative to the sleeve (901). In addition, an elastic reset member (9061) is provided on the swing rod (906). The inner side of the swing rod (906) is a curved surface with a recessed portion, and the outer side of the swing rod (906) is a flat surface. The movement of the slider (905) triggers the swing of the swing rod (906). A guide clamping block (907) fixed relative to the valve seat (2) is provided on the outer side of the swing rod (906). An arc-shaped guide surface is provided below the guide clamping block (907). During the swinging process of the swing rod (906), the arc-shaped guide surface of the guide clamping block (907) cooperates with the top end of the swing rod (906), and the end of the distance from the arc-shaped guide surface of the guide clamping block (907) to the hinge point of the swing rod (906) is smaller than the initial end.

2. The anti-drip opening and closing buffer check valve according to claim 1 is characterized in that: The elastic return member (9061) is a torsion spring.

3. The anti-drip opening and closing buffer check valve according to claim 1 is characterized in that: The end of the swing rod (906) is provided with a roller.

4. The anti-drip opening and closing buffer check valve according to claim 1 is characterized in that: The initial end of the guide pressing block (907) is provided with a roller.

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