CN108547982B - A kind of controllable angle-style check-valves of aperture - Google Patents

Abstract

The invention relates to an angle-type check valve with controllable opening. The invention mainly includes a valve body, a sleeve, a large valve core, a valve cover, a valve stem, a sealing component and an electric actuator. The principle is that by controlling the stroke of the large spool, the stroke of the four small spools arranged around it is limited, and the small spool realizes the non-return effect on the fluid under the force of the spring. Check valves belong to the category of automatic valves, and are mainly used on pipelines with one-way flow of medium, and only allow the medium to flow in one direction to prevent accidents. The difference between the present invention and the traditional check valve is that it uses four small spools to divide the flow, which has better stability. On the other hand, the present invention can drive the large valve core to control the opening through the electric actuator, which is more in line with the automation control requirements of modern industry. The opening controllable angle check valve has the advantages of simple operation, convenient installation, safety and reliability.

Description

A controllable angle check valve

technical field

The invention relates to the technical field of check valves, in particular to a controllable angle check valve.

Background technique

Check valve refers to a valve that is automatically opened and closed by the flow of the medium itself, also known as check valve, one-way valve, reverse flow valve, and back pressure valve. The check valve is a kind of automatic valve, its main function is to prevent the backflow of the medium, prevent the water hammer pressure generated when the pump and the drive motor suddenly stop running, and the discharge of the container medium. Check valves are also used on lines that supply auxiliary systems where the pressure may rise above system pressure. At present, the most commonly used check valves in China mainly include swing check valves, lift check valves, butterfly check valves, slow-closing check valves, ball check valves and multi-channel check valves. Most of the valves are used in straight pipe sections, and they can only function as switches. Few check valves with controllable opening appear on the market today.

SUMMARY OF THE INVENTION The present invention relates to a controllable opening angle check valve, the principle of which is to limit the stroke of four small valve cores arranged around it by controlling the stroke of the large valve core. Under the force, the non-return effect on the fluid is realized. Check valves belong to the category of automatic valves, and are mainly used on pipelines with one-way flow of medium, and only allow the medium to flow in one direction to prevent accidents. The difference between the present invention and the traditional check valve is that four small spools are used to divide the flow, which has better stability. On the other hand, the present invention can drive the large valve core to control the opening through the electric actuator, which is more in line with the automation control requirements of modern industry.

The technical scheme adopted to realize the above-mentioned purpose is:

A controllable opening angle check valve, including a valve body, a sleeve, a large valve core, a sleeve upper cover, a guide sleeve, a valve cover, fully threaded studs and nuts, a valve stem, a sealing assembly, and a compression nut , bracket, clip nut and electric actuator;

The valve body is provided with a bonnet and fixed by fully threaded studs and nuts; the bonnet is provided with a bracket and fixed by a compression nut, and the bracket is provided with an electric actuator;

A sleeve is provided at the intersection of the inlet and outlet of the valve body, and the valve stem runs through the bracket, the valve cover, and reaches the sleeve; a sealing assembly is provided between the valve stem and the valve cover; There is a guide sleeve; one end of the valve stem is fixedly connected to the electric actuator, and the other end is threadedly connected to the large valve core; the electric actuator drives the large valve core to move up and down along the center line through the valve stem;

Four sets of spool components are evenly arranged in the sleeve along the circumferential position, and each set of spool components includes a small spool, a key, a spring and a spool support; a spring is installed between the small spool and the spool support, and the small valve Also be provided with key on the core, fix and locate the end face position that small valve core contacts with big valve core by key.

The large spool is divided into three sections, consisting of a cone, a cylinder and a hemisphere from top to bottom; to prevent the small spool from opening too much to cause its lower end surface to break away from the spool when the large spool is fully open. The apex angle of the cone is designed to be 25-35°, mainly considering that when the maximum opening of the large valve core is considered, the small valve core can also reach the maximum opening. The required output force of the electric actuator is small enough.

The inlet section of the valve body is provided with a guide vane, and the distance between the arc of the guide vane near the sleeve and the shaft center of the valve stem is 1.2 to 1.5 times the diameter of the outer circle of the sleeve; it is used for flow diversion, anti-collision, and future The flow splits into two streams that are directed into the cavity of the valve.

The diameter of the middle cavity of the valve body is 1.5 times the diameter of the inlet and outlet.

The upper cover of the sleeve and the guide sleeve are interference fit, and the shrink fit process is adopted.

The contact surface between the small valve core and the large valve core, and the sealing surface between the small valve core and the sleeve are hardened.

The hardening treatment is nitriding or surfacing of hard alloy to improve its wear resistance, thereby increasing the service life of the angle control valve with controllable opening.

The working principle of the check valve of the present invention:

With the action of the electric actuator, the valve stem drives the large valve core to move up and down along the center line of the valve stem. When the large spool is at the lowest end, the four small spools will be in a closed state, and as the large spool rises, there will be a distance between the end surface of the small spool bottom and the large spool, which is why The maximum displacement that the small spool can open. When the large spool is in the fully open state, the small spool will also reach the maximum opening when the incoming pressure is large enough. At this time, it is the fully open state of the opening controllable angle check valve.

The beneficial effects of the present invention are:

(1) Compared with the valve installed on the straight pipe section, the present invention can be directly installed at the bend of the pipeline, which reduces the number of joints of the pipeline.

(2) Compared with the traditional check valve, the invention realizes the adjustable opening of the check valve spool, and is more suitable for the fields of modern industrial automation process control and the like.

(3) In the design stage, the present invention mainly refers to the structure of the existing angle control valve, which makes it possible to directly process the casting blanks such as the valve body and bonnet of the angle sleeve control valve when manufacturing the valve, saving The cost of mold opening is reduced, the production cost is reduced, and it even has a positive effect on the blank casting of valve body and bonnet that consumes inventory. (4) The opening controllable angle check valve of the present invention has the advantages of simple operation, convenient installation, safety and reliability.

Description of drawings

Fig. 1 is a structural diagram of a controllable angle check valve of the present invention.

Fig. 2 is an A-A sectional view of a controllable opening angle check valve of the present invention.

Fig. 3 is a structural diagram of a valve core assembly of a controllable opening angle check valve according to the present invention.

Fig. 4 is a B-B sectional view of a controllable opening angle check valve of the present invention.

Fig. 5 is a diagram of the working principle of a controllable opening angle check valve of the present invention, a - the closed state of the small spool, and b - the open state of the small spool.

In the figure: 1. Valve body, 2. Sleeve, 3. Large valve core, 4. Sleeve upper cover, 5. Guide sleeve, 6. Valve cover, 7. Fully threaded stud and nut, 8. Valve stem, 9. Seal assembly, 10. Compression nut, 11. Bracket, 12. Wafer nut, 13. Electric actuator, 22. Small spool, 23. Key, 24. Spring, 25. Spool support, 1a. Guide leaf.

Detailed ways

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

Figure 1 and Figure 3 are the structural diagrams of a controllable angle check valve and its components according to the present invention, including a valve body 1, a sleeve 2, a large valve core 3, a sleeve upper cover 4, and a guide sleeve 5. Bonnet 6, fully threaded stud and nut 7, valve stem 8, sealing assembly 9, compression nut 10, bracket 11, clip nut 12 and electric actuator 13;

The valve body 1 is provided with a bonnet 6 which is fixed by fully threaded studs and nuts 7; the bonnet 6 is provided with a bracket 11 which is fixed by a compression nut 10, and the bracket 11 is provided with an electric actuator 13;

A sleeve 2 is provided at the intersection of the inlet and outlet of the valve body 1, the valve stem 8 runs through the bracket 11, the valve cover 6, and reaches the sleeve 2; a sealing assembly 9 is provided between the valve stem 8 and the valve cover 6; the valve stem 8 There is a guide sleeve 5 between the sleeve upper cover 4; one end of the valve stem 8 is fixedly connected with the electric actuator 13, and the other end is threaded with the large valve core 3; the electric actuator 13 drives the large valve core through the valve stem 8 3 Move up and down along the center line of ;

Four groups of spool assemblies are evenly arranged in the circumferential direction of the sleeve 2, and each group of spool assemblies includes a small spool 22, a key 23, a spring 24 and a spool support 25; A spring 24 is installed between them, and a key 23 is also provided on the small spool 22, and the end face position where the small spool 22 contacts with the large spool 3 is fixed and positioned by the key 23.

The large spool 3 is composed of three sections, consisting of a cone, a cylinder and a hemisphere from top to bottom, and the apex angle of the cone is 25-35°.

The inlet section of the valve body 1 is provided with a guide vane 1a, and the distance between the arc of the guide vane 1a close to the sleeve 2 and the shaft center of the valve stem 8 is 1.2-1.5 times the diameter of the outer circle of the sleeve 2 .

The diameter of the cavity of the valve body 1 is 1.5 times the diameter of the inlet and outlet.

The sleeve upper cover 4 and the guide sleeve 5 are an interference fit, and a shrink fit process is adopted.

The contact surface between the small valve core 22 and the large valve core 3 and the sealing surface between the small valve core 22 and the sleeve 2 are hardened; the hardened treatment is nitriding or surfacing of hard alloy.

The assembling of the present invention is mainly divided into three parts and carries out. They are respectively the assembly of the sleeve assembly 2, the assembly of the integral valve part, and the assembly of the electric actuator 13.

The first step, the assembly of the spool assembly:

As shown in Figure 3, first put the key 23 into the keyway of the small valve core 22, then place the small valve core 22 at the corresponding window of the sleeve 2, then put the spring 24 and the valve core bracket 25 in sequence and use screws Fixed (as shown in Figure 4). Install other three small spools 22 in this way again. Combine the large spool 3 with the valve stem 8, pass the large spool 3 from the sleeve 2 from top to bottom through the central hole and place it in the middle of the four small spools 22 . The guide sleeve 5 is fixed in the sleeve upper cover 4 by adopting the shrink-fit process. Insert the sleeve upper cover 4 from the upper end of the valve stem 8 until the central hole of the sleeve 2, and fix it by thread. Small holes are processed on the sleeve loam cake 4, which is convenient for tightening the thread.

After the spool assembly is installed, the four small spools (22) are all closed.

The second step is the assembly of the overall valve part:

First put the backing ring into the groove in the middle chamber of the valve body 1, put it into the previously assembled sleeve 2 and tighten it. Place backing rings in the grooves in the top flange of the valve body 1 and in the grooves on the upper end of the sleeve 2 respectively. Insert the valve cover 6 from the upper end of the valve stem 8 until it fits with the top flange of the valve body 1, and fix it with fully threaded studs and nuts 7.

Afterwards, as shown in FIG. 5 , put the sealing assembly 9 into the stuffing chamber on the top of the valve cover 7 and fix it.

The third step is the assembly of the electric actuator 13:

After connecting the electric actuator 13 with the bracket 11, put it into the upper end of the valve cover, and use the compression nut 10 to fix it. The valve stem 8 is connected with the electric actuator 13 through the clip nut 12 . Up to this step, the assembly of the present invention is completed, as shown in Figure 1.

The working principle is:

The large valve core 3 and the valve stem 8 are controlled to move up and down along the center line of the valve stem 8 by the electric actuator 13 .

The position of the large spool 3 determines the actual maximum opening of the small spool 22. When the large spool 3 is at the lowest position, the maximum opening of the small spool 22 is zero, which means the valve is closed at this time. . When the large spool 3 rises, there is a gap between it and the small spool 22, and the maximum opening of the small spool 22 is not zero at this moment. When the force of the inlet fluid acting on the small spool 22 is not greater than the force of the spring 24, the small spool 22 is still in the closed state (as shown in FIG. 5a), that is to say, the valve is in the closed state at this time. When the force of the inlet fluid acting on the small spool 22 is greater than the force of the spring 24, the small spool 22 is opened (as shown in FIG. 5b), that is to say, the valve is in an open state at this time.

In order to prevent the impact of the incoming flow on the small spool 22 from being damaged, a guide vane 1a for diverting flow is provided at the inlet, and the cross section of the guide vane is shown in FIG. 2 . This can also ensure that each small spool 22 can receive relatively balanced pressure.

When the overall valve is in the open state, if you want to close the valve, you only need to give the electric actuator 13 a downward signal, and the large spool 3 will drop to the low end accordingly. At the same time, the tapered surface of the large spool 3 will force the small spool 22 to move along Move toward the sealing surface along a straight line perpendicular to the center line of the valve core until it fits with the sealing surface on the sleeve 21, and the valve is closed.

The protection scope of the present invention is not limited to the above-mentioned embodiments, but also includes other embodiments and modification examples within the scope of the concept of the present invention.

Claims (7)

1. A controllable opening angle check valve, characterized in that it includes a valve body (1), a sleeve (2), a large valve core (3), a sleeve upper cover (4), a guide sleeve (5 ), bonnet (6), fully threaded stud and nut (7), valve stem (8), seal assembly (9), compression nut (10), bracket (11), clip nut (12) and electric executive body (13); The valve body (1) is provided with a bonnet (6) and is fixed by fully threaded studs and nuts (7); the bonnet (6) is provided with a bracket (11) and is fixed by a compression nut (10), An electric actuator (13) is arranged on the bracket (11); The inlet and outlet intersection of the valve body (1) is provided with a sleeve (2), and the valve stem (8) runs through the support (11), valve cover (6), and reaches the sleeve (2); the valve stem (8) ) and the bonnet (6) are provided with a sealing assembly (9); a guide sleeve (5) is provided between the valve stem (8) and the sleeve upper cover (4); one end of the valve stem (8) is connected to the motor The actuator (13) is fixedly connected, and the other end is threadedly connected with the large spool (3); the electric actuator (13) drives the large spool (3) to move up and down along the central line through the valve stem (8); Four sets of spool assemblies are evenly arranged in the sleeve (2) along the circumferential position, and each set of spool assemblies includes a small spool (22), a key (23), a spring (24) and a spool support (25); A spring (24) is installed between the small spool (22) and the spool support (25), and a key (23) is also provided on the small spool (22), and the small spool (23) is fixed and positioned by the key (23). 22) The position of the end surface in contact with the large spool (3). 2. A controllable opening angle check valve as claimed in claim 1, characterized in that the large valve core (3) is composed of three sections, consisting of a cone, a cylinder and a cylinder from top to bottom. Hemisphere, the apex angle of the cone is 25-35°. 3. A controllable opening angle check valve according to claim 1, characterized in that a guide vane (1a) is arranged in the inlet section of the valve body (1), and the guide vane (1a) is close to The distance between the arc at the sleeve (2) and the shaft center of the valve stem (8) is 1.2 to 1.5 times the diameter of the outer circle of the sleeve (2). 4. A controllable opening angle check valve according to claim 1, characterized in that the diameter of the middle cavity of the valve body (1) is 1.5 times the diameter of the inlet and outlet. 5. A controllable opening angle check valve as claimed in claim 1, characterized in that the upper cover of the sleeve (4) and the guide sleeve (5) are interference fit and adopt a shrink fit process. 6. A controllable opening angle check valve according to claim 1, characterized in that the contact surface between the small valve core (22) and the large valve core (3), the small valve core (22) The sealing surface with the sleeve (2) is hardened. 7. A controllable opening angle check valve according to claim 6, wherein the hardening treatment is nitriding or surfacing of hard alloy.