Pressure balance fluid control valve

Abstract

The utility model discloses a pressure balance fluid control valve which comprises a valve body provided with an input interface and an output interface, and the valve body is connected with an external pipeline through the input interface and the output interface; the valve element assembly is arranged in the valve body and used for controlling connection and disconnection between the input connector and the output connector. The pressure conduction assembly is connected with the valve element assembly so as to conduct pressure borne by the side, opposite to the fluid, of the valve element assembly to the other side of the valve element assembly. Pressure balance on the two sides of the valve element is achieved through pressure conduction, operating force is reduced, abrasion is reduced, the stability of the valve is improved, the service life of the valve is prolonged, and the overall reliability is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a valve, more specifically to a pressure balance fluid control valve. BACKGROUND

[0002] The existing valve after closing, the valve core assembly blocks fluid in the valve body, therefore the valve core assembly will bear the pressure difference of fluid, the stronger the fluid pressure, the stronger the pressure difference that the valve core assembly bears, the existing valve core assembly mostly adopts one dynamic and one static component combination to realize opening and closing, the valve stem is fixed with the dynamic component, drives the dynamic component to move on the static component, to realize opening and closing, so the pressure difference generated above will affect the friction between the dynamic component and the static component, therefore easily leads to the problem that the torque required for driving the dynamic component is large during the valve opening process.

[0003] Therefore, in order to solve the above problems, the prior art has a utility model patent with patent number 200910007470X, named multifunctional universal balance valve, which discloses a kind of through coupling sleeve drainage to piston, utilizes piston to provide pressure to plunger valve core, to realize plunger valve core upper and lower two sides pressure balance, solve the above problem that the torque required for driving component is large, however, in the process of working in this way, valve flap is combined by pilot valve core and plunger valve core, in the process of opening, pilot valve core needs to be started first, so there will be the problem that valve stem will drive pilot valve core first, and then drive plunger valve core, which will lead to the problem that valve flap and valve stem structure are relatively complex, and prone to failure after long time operation. UTILITY MODEL CONTENT

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a pressure balance fluid control valve, which has simple structure of valve flap and valve stem and is not prone to failure after long time operation.

[0005] To achieve the above object, the utility model provides the following technical scheme: a pressure balance fluid control valve, comprising:

[0006] Valve body, the valve body has input interface and output interface, and is connected with external pipeline through input interface and output interface;

[0007] Fixed valve plate, the fixed valve plate is fixed in valve body, and at least one through hole is formed in the fixed valve plate;

[0008] Dynamic valve plate, the dynamic valve plate is rotatably arranged on the fixed valve plate, at least one through hole is formed in the dynamic valve plate, and the passage in the valve body is opened or closed by whether the through hole and the through hole are communicated;

[0009] Pressure chamber, the pressure chamber is arranged in the valve body;

[0010] A piston is slidably arranged in the pressure chamber and connected with the movable valve plate.

[0011] A guide channel is in communication with the input interface at one end and the pressure chamber at the other end to guide the medium from the input interface into the pressure chamber.

[0012] As a further improvement of the utility model, the movable valve plate is at one end of the fixed valve plate facing the input interface.

[0013] As a further improvement of the utility model, the utility model further comprises a driving valve rod, one end of the driving valve rod is fixed with the movable valve plate, the other end of the driving valve rod is driven by an external driving component after penetrating out of the valve body, the guide channel is arranged in the driving valve rod, one end of the guide channel is in communication with the input interface, the other end of the guide channel is in communication with the pressure chamber, the piston is coaxially sleeved or integrally arranged on the driving valve rod or rotatably and axially limitedly sleeved on the driving valve rod.

[0014] As a further improvement of the utility model, the end of the driving valve rod is fixed with a gland, the movable valve plate is clamped and fixed between the gland and the end of the driving valve rod, a pressure guiding channel is formed in the gland, one end of the pressure guiding channel is in communication with the guide channel, the other end of the pressure guiding channel is in communication with the input interface.

[0015] As a further improvement of the utility model, the pressure chamber is provided with a vent hole, the piston divides the pressure chamber into two regions, the vent hole is in communication with the lower region, the side wall of the driving valve rod is provided with a communication hole, one end of the communication hole is in communication with the guide channel, the other end of the communication hole is in communication with the upper region of the pressure chamber.

[0016] As a further improvement of the utility model, the lower end surface of the piston is fixed with an antifriction pad, the lower end surface of the piston is abutted against the inner wall of the pressure chamber through the antifriction pad.

[0017] As a further improvement of the utility model, the position, where the pressure chamber is abutted against the antifriction pad, is provided with an antifriction structure, the antifriction structure is abutted against the antifriction pad.

[0018] As a further improvement of the utility model, the antifriction structure comprises a plurality of antifriction rings, the diameters of the plurality of antifriction rings are sequentially increased and coaxially nested, the cross section of the antifriction ring is semicircular, one horizontal surface is integrated with the inner wall of the pressure chamber, and one arc surface is abutted against the antifriction pad.

[0019] As a further improvement of the utility model, the force receiving area of the piston in contact with the fluid is less than or equal to the force receiving area of the movable valve plate in contact with the fluid.

[0020] Advantages

[0021] The pressure balance fluid control valve of the utility model discloses has integrated pressure conduction design, spares the pilot valve core structure, directly utilizes the conduction channel to conduct the input pressure to the piston and realizes the pressure balance of the valve core assembly two sides, solves the problem of complex structure, easy to break down in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the internal structure schematic view of the opening of the pressure balance fluid control valve piston valve rod integration of the utility model;

[0023] Figure 2 It is the internal structure schematic view of the closing of the pressure balance fluid control valve piston valve rod integration of the utility model;

[0024] Figure 3 It is Figure 1 The enlarged view of A part in Fig.

[0025] Figure 4 It is the internal structure schematic view of the opening of the pressure balance fluid control valve piston valve rod split of the utility model;

[0026] Figure 5 It is the internal structure schematic view of the closing of the pressure balance fluid control valve piston valve rod split of the utility model;

[0027] Figure 6 It is Figure 4 The enlarged view of B part in Fig. DETAILED DESCRIPTION

[0028] Referring to Fig. Figures 1 to 3 The pressure balance fluid control valve comprises:

[0029] Valve body 1, the valve body 1 has input interface and output interface, is connected with the outside pipeline through input interface and output interface;

[0030] Fixed valve plate 21, the fixed valve plate 21 is fixed in valve body 1, and at least one through hole 211 is formed in it;

[0031] Movable valve plate 22, the movable valve plate 22 is rotatably arranged on fixed valve plate 21, and at least one conduction hole 221 is formed in it, and the channel inside valve body 1 is conducted or closed by whether the conduction hole 221 and the through hole 211 are communicated;

[0032] Pressure chamber 33, the pressure chamber 33 is arranged in valve body 1;Piston 32, the piston 32 is slidably arranged in pressure chamber 33 and is connected with movable valve plate 22;

[0033] The guide channel 31 is in communication with the input interface at one end and the pressure applying cavity 33 at the other end, so as to guide the medium from the input interface into the pressure applying cavity 33. After the fluid enters the valve body 1 from the input interface, part of the fluid flows into the pressure applying cavity 33 through the guide channel 31 to act on the piston 32, and the piston 32 transmits the pressure to the movable valve plate 22 to balance the pressure on both sides of the movable valve plate 22. The balance is normal and does not need to be guided in the working process, which solves the problem of complex structure and easy failure of the prior art caused by the pilot valve core. Without step-by-step driving, the balance is achieved directly through pressure transmission, which simplifies the valve disc and valve rod structure and reduces the risk of failure.

[0034] Further, referring to Figures 1 to 3 The movable valve plate 22 is at the end of the fixed valve plate 21 facing the input interface. The movable valve plate 22 directly faces the input fluid, so that the pressure transmission path is shorter, the fluid pressure can directly act on the movable valve plate 22, and the reverse pressure transmitted by the piston 32 can achieve precise balance. At the same time, since the movable valve plate 22 and the fixed valve plate 21 are opened and closed by the through hole 211 and the guide hole 221, the fluid passes through the movable valve plate 22 and the fixed valve plate 21 in a straight line, so the water resistance can be effectively reduced.

[0035] Further, referring to Figures 1 to 3 The driving valve rod 23 is fixed at one end of the movable valve plate 22 and driven by an external driving component after the other end passes out of the valve body 1. The guide channel 31 is arranged in the driving valve rod 23 and in communication with the input interface at one end and the pressure applying cavity 33 at the other end. The piston 32 is coaxially sleeved or integrally arranged on the driving valve rod 23, or rotatable and axially limited on the driving valve rod 23. In the embodiment, the piston 32 is fixed or separately arranged with the valve rod 23 (sleeved with a connecting component, or directly integrally formed as shown in Figures 4 to 6 The piston 32 and the valve rod 23 can be rotatable and axially limited by a step, and a sealing ring is sleeved on the valve rod 23 to seal the space between the piston 32 and the valve rod 23, so as to reduce the torque increase caused by the rotation of the piston 32 when the valve rod 23 rotates, as shown in Figures 4 to 6 The external driving component directly drives the movable valve plate 22 to rotate through the driving valve rod 23, without the need for a pilot valve core, which simplifies the transmission structure. The guide channel 31 is integrated in the driving valve rod 23, avoiding additional pipelines and solving the problem of complex valve rod structure and easy failure in the background art.

[0036] Further, referring to Figures 1 to 3As shown, the end of the drive valve stem 23 is fixed with a gland 24, the valve disc 22 is clamped and fixed between the gland 24 and the end of the drive valve stem 23, the gland 24 is provided with a pressure channel 241, one end of the pressure channel 241 is communicated with the guide channel 31, and the other end is communicated with the input interface. The gland 24 clamps the valve disc 22 by mechanical clamping instead of traditional bolt connection; the pressure channel 241 can directly introduce the medium into the guide channel 31.

[0037] Further, referring to Figures 1 to 3 As shown, the pressure chamber 33 is provided with a vent hole 331, the piston 32 divides the pressure chamber 33 into upper and lower two regions, the vent hole 331 communicates with the lower region, the side wall of the drive valve stem 23 is provided with a communication hole 231, one end of the communication hole 231 is communicated with the guide channel 31, and the other end is communicated with the upper region of the pressure chamber 33. The vent hole 331 balances the air pressure in the lower region to avoid air pressure resistance when the piston 32 moves; the communication hole 231 makes the guide channel 31 and the upper region butt joint, effectively guiding the medium from the guide channel 31 into the upper region.

[0038] Further, referring to Figures 1 to 3 As shown, the lower end surface of the piston 32 is fixed with an antifriction pad 321, the lower end surface of the piston 32 abuts against the inner wall of the pressure chamber 33 through the antifriction pad 321, and the piston 32 rotates in the process of the valve stem 23. Therefore, the antifriction pad is arranged to effectively reduce the wear and friction of the piston 32.

[0039] Further, referring to Figures 1 to 3 As shown, the position of the pressure chamber 33 abutting against the antifriction pad 321 is provided with an antifriction structure 332, and the antifriction structure 332 abuts against the antifriction pad 321. The antifriction structure 332 and the antifriction pad 321 form a double-layer antifriction system, which better realizes the reduction of wear and friction.

[0040] Further, referring to Figures 1 to 3 As shown, the antifriction structure 332 includes a plurality of antifriction rings 333, the plurality of antifriction rings 333 are coaxially nested with increasing diameters, and the cross section of the antifriction ring 333 is semicircular, one horizontal side is integrated with the inner wall of the pressure chamber 33, and the arc-shaped side abuts against the antifriction pad 321. The nested semicircular structure reduces the contact area while ensuring the support stability through the annular distribution.

[0041] Further, referring to Figures 1 to 3As shown, the force bearing area of the piston 32 in contact with the fluid is less than or equal to the force bearing area of the moving valve plate 22 in contact with the fluid. In design, the downward force bearing area Sdown is less than or equal to the upward force bearing area Sup, and is substantially equal. Since force F = P x S, the rotating friction force of the moving valve plate 22 and the fixed valve plate 21 is substantially equal, so that the force of the moving valve plate acting on the fixed valve plate is less affected by the change of water pressure, thereby the torque generated by the rotation of the moving valve plate and the friction of the fixed valve plate is substantially consistent under different water pressure, and the effect is obvious in high pressure application.

[0042] In summary, the pressure balance fluid control valve has the effects of simple structure and long time use without easy failure, compared with the prior art, by the design of the valve body 1, the fixed valve plate 21, the moving valve plate 22, the pressure applying cavity 33, the piston 32 and the through channel 31.

[0043] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above embodiment. Any technical solution falling within the idea of the present application is within the protection scope of the present application. It should be noted that, for ordinary skilled in the art, some improvements and decorations without departing from the principle of the present application are also considered as the protection scope of the present application.

Claims

1. A pressure balanced fluid control valve characterized by: The utility model relates to a valve, comprising: a valve body (1) having an input interface and an output interface for connecting with external pipelines; a fixed valve plate (21) fixed in the valve body (1) and having at least one through hole (211) formed therein; a movable valve plate (22) rotatably arranged on the fixed valve plate (21) and having at least one guide hole (221) formed therein for guiding or closing the passage in the valve body (1) by the communication or non-communication between the guide hole (221) and the through hole (211); a pressure chamber (33) arranged in the valve body (1); a piston (32) slidably arranged in the pressure chamber (33) and connected with the movable valve plate (22); a guide passage (31) having one end in communication with the input interface and the other end in communication with the pressure chamber (33) for guiding the medium from the input interface into the pressure chamber (33).

2. The pressure balanced fluid control valve of claim 1, wherein: The movable valve plate (22) is located at the end of the fixed valve plate (21) facing the input interface.

3. The pressure balanced fluid control valve of claim 1 or 2, wherein: The utility model further comprises a driving valve rod (23) having one end fixed with the movable valve plate (22) and the other end driven by an external driving member after penetrating out of the valve body (1), wherein the guide passage (31) is arranged in the driving valve rod (23) and has one end in communication with the input interface and the other end in communication with the pressure chamber (33), and the piston (32) is coaxially sleeved or integrally arranged on the driving valve rod (23) or rotatably and axially limitedly sleeved on the driving valve rod (23).

4. The pressure balanced fluid control valve of claim 3, wherein: The end of the driving valve rod (23) is fixed with a gland (24), the movable valve plate (22) is clamped and fixed between the gland (24) and the end of the driving valve rod (23), and the gland (24) is formed with a pressure guide passage (241) having one end in communication with the guide passage (31) and the other end in communication with the input interface.

5. The pressure balanced fluid control valve of claim 4, wherein: The pressure chamber (33) is formed with a vent hole (331), the piston (32) divides the pressure chamber (33) into upper and lower regions, the vent hole (331) is in communication with the lower region, the sidewall of the driving valve rod (23) is formed with a communication hole (231) having one end in communication with the guide passage (31) and the other end in communication with the upper region of the pressure chamber (33).

6. The pressure balanced fluid control valve of claim 5, wherein: The lower end surface of the piston (32) is fixed with an antifriction pad (321), and the lower end surface of the piston (32) abuts against the inner wall of the pressure chamber (33) through the antifriction pad (321).

7. The pressure balanced fluid control valve of claim 6, wherein: The position of the pressure chamber (33) abutting against the antifriction pad (321) is provided with an antifriction structure (332) abutting against the antifriction pad (321).

8. The pressure balanced fluid control valve of claim 7, wherein: The antifriction structure (332) comprises a plurality of antifriction rings (333) coaxially and nested with increasing diameters, and the cross section of the antifriction ring (333) is semicircular, one horizontal surface is integrated with the inner wall of the pressure chamber (33), and the arc-shaped surface abuts against the antifriction pad (321).

9. The pressure balanced fluid control valve of claims 1 or 2, wherein: The force area of the piston (32) in contact with the fluid is less than or equal to the force area of the moving valve plate (22) in contact with the fluid.

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