Axial-flow type basic valve

Abstract

The invention relates to an axial-flow type basic valve which comprises a valve body, a rubber container, a punching net cover, a tail supporting seat, a valve seat, a reset spring, a flow guide cover, a first valve body, a matched pipe and a second valve body. The valve body is a straight-through type inner cavity, the flow guide cover is fixed to an inlet in the valve body, the tail supporting seat is fixed to an outlet in the valve body, the valve seat is fixed to the flow guide cover and the tail supporting seat and located between the flow guide cover and the tail supporting seat, the punching mesh cover is fixed to the tail supporting seat, and a control cavity is formed among the inner wall of the valve body, the flow guide cover, the valve seat and the tail supporting seat. The rubber container is located in the control cavity, covers the surface of one side of the control cavity and is supported by the punched mesh enclosure. The reset spring is sleeved in the middle of the rubber liner; one end of the first valve is communicated with the inlet end of the valve body; one end of the second valve is communicated with the outlet end of the valve body; compared with the prior art, the method has the advantages that a large number of parts are reduced, the design cost is reduced, and the performance is improved.

Description

Technical Field

[0001] The invention relates to the field of hydraulic control valves, in particular to an axial flow basic valve. Background Art

[0002] At present, the diaphragm hydraulic control valves with various functions on the market are composed of basic valves and main valves, which are composed of valve body (similar to stop valve), valve cover, valve shaft, valve disc assembly, spring, diaphragm, diaphragm pressure plate, valve seat, fasteners, etc. Its working principle is mainly based on the upstream and downstream pressure difference △P as the power, which is controlled by the pilot valve to make the diaphragm hydraulically differentially operated, so that the opening, closing or adjustment state of the main valve disc is completely automatically adjusted by hydraulic force.

[0003] It has the following defects:

[0004] 1. There are many parts and the cost is high;

[0005] 2. Its flow channel is an "S"-shaped channel with low inlet and high outlet, poor flow pattern, large turbulence disturbance, poor opening linear characteristics, and easy to produce unstable factors such as vibration cavitation and pressure fluctuation. Summary of the invention

[0006] The purpose of the present invention is to provide an axial flow basic valve in order to overcome the defects of the existing basic valve "S" type in the above-mentioned prior art, such as large turbulence disturbance in the flow channel, large cavitation tendency, poor opening linear characteristics, inaccurate flow control in a small opening state, and large pressure fluctuations.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] An axial flow basic valve comprises a valve body, a rubber bladder, a punching mesh cover, a tail support seat, a valve seat, a return spring, a flow guide cover, a first valve, a pipe and a second valve;

[0009] The valve body is a straight-through inner cavity, the guide cover is fixed at the inlet of the valve body, the tail support seat is fixed at the outlet of the valve body, the valve seat is fixed on the guide cover and the tail support seat, and is located between the guide cover and the tail support seat, the perforated mesh cover is fixed on the tail support seat, and a control cavity is formed between the inner wall of the valve body and the guide cover, the valve seat and the tail support seat; the rubber bladder is located in the control cavity, covers one side surface of the control cavity, and is supported by the perforated mesh cover; the reset spring is sleeved in the middle position of the rubber bladder;

[0010] One end of the first valve is connected to the inlet end of the valve body, and the other end is connected to the control chamber through a pipe; one end of the second valve is connected to the outlet end of the valve body, and the other end is connected to the control chamber through a pipe.

[0011] Furthermore, the rubber bladder is a molded elastic rubber sleeve, which shrinks when the water pressure in the control chamber increases, expands when the water pressure in the control chamber decreases, and covers the guide cover, the valve seat and the tail support seat.

[0012] Furthermore, the rubber bladder is a cylindrical structure recessed inwardly, a fixing groove matching with a reset spring is provided in the middle of the rubber bladder, and a fixing protrusion for connecting with an end of a valve body is provided at the end of the rubber bladder.

[0013] Furthermore, the perforated mesh cover is a stainless steel conical tube of equal thickness.

[0014] Furthermore, a rubber ring is provided at the connection between the valve seat and the air guide cover, and at the connection between the valve seat and the tail support seat.

[0015] Furthermore, the first valve is a needle valve.

[0016] Furthermore, the second valve is a ball valve.

[0017] Furthermore, the axial flow basic valve also includes a pilot valve, which is located in the connecting pipeline between the second valve and the outlet end of the valve body.

[0018] Furthermore, the inlet end and the outlet end of the valve body are both provided with standard flanges, and each standard flange is respectively provided with a step for fixing the guide cover and the tail support seat.

[0019] Further, when the first valve is opened and the second valve is closed, the water pressure at the inlet end of the axial flow basic valve enters the valve body and the control cavity respectively, the rubber bladder covers the surfaces of the guide cover, the valve seat and the tail support seat, and the axial flow basic valve is in a fully closed state;

[0020] When the first valve is opened and the second valve is opened with an opening not less than 0, the water flow through the first valve and the ball valve reaches a balance, the rubber bladder floats in the control chamber, and the axial flow basic valve is in a floating state;

[0021] When the first valve is closed and the second valve is opened, the water pressure in the control chamber is released through the second valve, the rubber bladder covers the inside of the valve body, and the axial flow basic valve is in a fully open state.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] (1) The axial flow basic valve provided by the present invention forms a control chamber with the inner wall of the valve body by arranging a flow guide cover, a valve seat and a tail support seat in the valve body. On the one hand, the water pressure of the control chamber is controlled by a needle valve pipeline connected to the inlet end of the valve body and a ball valve pipeline connected to the outlet end of the valve body. On the other hand, a rubber bladder is arranged in the control chamber and covers one side surface of the control chamber. When the water pressure on both sides of the control chamber is different, the rubber bladder covers the flow guide cover and the tail support seat to close the valve; or covers the inner wall of the valve body to connect the flow guide cover and the tail support seat to open the valve.

[0024] Thereby, an axial flow hydraulic control valve structure is realized, and the control process is convenient and reliable.

[0025] (2) The present invention adopts a brand-new basic valve design concept and selects an axial flow fully symmetrical main valve flow path, which greatly reduces the shortcomings of the existing basic valve "S" type, large flow path turbulence disturbance, large cavitation tendency, poor opening linear characteristics, inaccurate flow control in small opening states, and large pressure fluctuations.

[0026] The basic valve of the present invention adopts an extremely simple and reasonable design structure, with greatly reduced parts and components, and the main valve part does not even use a screw, so the design cost is greatly reduced and the performance advantages are greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the axial side appearance of an axial flow basic valve provided in an embodiment of the present invention;

[0028] Figure 2 It is a schematic diagram of the main structure of an axial flow basic valve provided in an embodiment of the present invention;

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of an axial flow basic valve provided in an embodiment of the present invention;

[0030] Figure 4 A schematic diagram of the appearance of a rubber bladder of an axial flow basic valve provided in an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the fully closed principle of an axial flow basic valve provided in an embodiment of the present invention;

[0032] Figure 6 It is a schematic diagram of the intermediate floating principle of an axial flow basic valve provided in an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of the fully open principle of an axial flow basic valve provided in an embodiment of the present invention;

[0034] In the figure, 1, valve body, 2, rubber bladder, 3, punching mesh cover, 4, tail support seat, 5, rubber ring, 6, valve seat, 7, return spring, 8, guide cover, 9, needle valve, 10, piping, 11, ball valve, 12, pilot valve, 13, control chamber. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0040] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] Example 1

[0042] like Figure 1-Figure 3 As shown, this embodiment provides an axial flow basic valve, including a valve body 1, a rubber bladder 2, a punching mesh cover 3, a tail support seat 4, a valve seat 6, a return spring 7, a guide cover 8, a first valve, a pipe 10 and a second valve;

[0043] The valve body 1 is a straight-through inner cavity, the guide cover 8 is fixed at the inlet of the valve body 1, the tail support seat 4 is fixed at the outlet of the valve body 1, the valve seat 6 is fixed on the guide cover 8 and the tail support seat 4, and is located between the guide cover 8 and the tail support seat 4, the perforated mesh cover 3 is fixed on the tail support seat 4, and a control cavity 13 is formed between the inner wall of the valve body 1 and the guide cover 8, the valve seat 6 and the tail support seat 4; the rubber bladder 2 is located in the control cavity 13, covers one side surface of the control cavity 13, and is supported by the perforated mesh cover 3; the reset spring 7 is sleeved in the middle position of the rubber bladder 2;

[0044] One end of the first valve is connected to the inlet end of the valve body 1 , and the other end is connected to the control chamber 13 through the pipe 10 ; one end of the second valve is connected to the outlet end of the valve body 1 , and the other end is connected to the control chamber 13 through the pipe 10 .

[0045] Preferably, the valve body 1 is a straight-through inner cavity with a simple shape and structure. The inlet and outlet ends of the valve body 1 are both provided with standard flanges, and each standard flange is respectively provided with a step for fixing the guide cover 8 and the tail support seat 4.

[0046] Optionally, the rubber bladder 2 is a molded elastic rubber sleeve, and the thickness is generally 4-8mm. Figure 4 The figure shows the natural state of the molding, which shrinks when the water pressure in the control chamber 13 increases, and expands when the water pressure in the control chamber 13 decreases, and covers the guide cover 8, the valve seat 6 and the tail support seat 4.

[0047] like Figure 4 As shown, preferably, the rubber bladder 2 is a cylindrical structure recessed inwardly, a fixing groove matching with the reset spring 7 is provided in the middle of the rubber bladder 2, and a fixing protrusion for connecting to the end of the valve body 1 is provided at the end of the rubber bladder 2.

[0048] Preferably, the perforated mesh cover 3 is a stainless steel conical tube of equal thickness, with a thickness generally varying from 2 to 4 mm, and is spot welded and fixed on the tail support seat 4 to support the contraction of the right half of the rubber bladder.

[0049] The tail support seat 4 is fixed at the valve body outlet and is used to support and fix the stainless steel perforated mesh cover 3 and the right end of the rubber bladder 2

[0050] Preferably, a rubber ring 5 is provided at the connection between the valve seat 6 and the air guide cover 8, and at the connection between the valve seat 6 and the tail support seat 4. In this embodiment, a rubber ring 5 is provided at each of the two positions to maintain the sealing state of the corresponding area.

[0051] The valve seat 6 is fixed on the guide cover 8 and the tail support seat 4. When the valve is closed, the water pressure in the control chamber 13 increases, and the valve seat 6 cooperates with the rubber bladder 2 to seal, which can cut off the water pressure of the inlet and outlet.

[0052] The reset spring 7 is sleeved on the middle position of the rubber bladder 2, mainly so that the rubber bladder 2 can be easily reset under the action of the spring when the control chamber 13 loses pressure.

[0053] The deflector 8 is fixed at the inlet of the valve body 1 , and has half the supporting force and fixing effect on the rubber bladder 2 and the valve seat 6 .

[0054] The first valve is preferably a needle valve 9 , which is fixed to the inlet side of the basic valve. The piping inlet of the needle valve 9 is communicated with the inlet side of the basic valve, and the outlet is communicated with the control chamber 13 .

[0055] The piping 10 mainly refers to various long and short pipes connecting the inlet cavity and the outlet cavity, in which a needle valve 9, a ball valve 11 and a pilot valve 12 are arranged to adjust the pressure and movement of the control chamber 13.

[0056] The second valve is preferably a ball valve 11 , which is fixed between the needle valve 9 and the pilot valve 12 , on the outlet side, and is used to open and close the conduction of the pipe 10 .

[0057] Preferably, the axial flow basic valve further comprises a pilot valve 12 , which is located in the connecting pipeline between the second valve and the outlet end of the valve body 1 and is mainly used to adjust the pressure change of the control chamber 13 .

[0058] Working principle:

[0059] like Figure 5 As shown, when the needle valve 9 is opened and the ball valve 11 is closed, the water pressure at the inlet end of the axial flow basic valve enters the valve body 1 and the control chamber 13 respectively, and the rubber bladder 2 covers the surface of the guide cover 8, the valve seat 6 and the tail support seat 4. At this time, the axial flow basic valve is in a fully closed state;

[0060] like Figure 6 As shown, when the needle valve 9 is opened and the ball valve 11 is opened with an opening not less than 0, the water flow through the needle valve 9 and the ball valve 11 reaches a balance, and the rubber bladder 2 floats in the control chamber 13. At this time, the axial flow basic valve is in a floating state;

[0061] like Figure 7 As shown, when the needle valve 9 is closed and the ball valve 11 is opened, the water pressure in the control chamber 13 is released through the ball valve 11, and the rubber bladder 2 covers the inside of the valve body 1. At this time, the axial flow basic valve is in a fully open state.

[0062] A specific embodiment example of the above-mentioned axial flow basic valve is provided below:

[0063] A basic axial flow valve, see Figure 2 :The basic valve is mainly composed of valve body 1, rubber bladder 2, perforated mesh cover 3, tail support seat 4, rubber ring 5, valve seat 6, reset spring 7, guide cover 8, needle valve 9, piping 10, ball valve 11, pilot valve 12 and other components; the valve body 1 is a straight-through inner cavity with a simple shape and structure. The inlet and outlet of the valve body are standard flanges, and steps are provided at the flanges to fix the tail support seat 4 and the guide cover 8; the rubber bladder 2 is a molded elastic rubber sleeve with a thickness of generally 4-8mm. Figure 4 The figure shows the natural state of molding. When the water pressure in the control chamber 13 increases, the rubber bladder begins to shrink, and begins to expand when it decreases. The perforated mesh cover 3 is made of stainless steel into a conical tube of equal thickness, and the thickness generally varies from 2 to 4 mm. It is spot welded and fixed on the tail support seat 4 to support the contraction of the rubber bladder 2. The tail support seat 4 is fixed at the outlet of the valve body, and is used to support and fix the right end of the stainless steel perforated mesh cover 3 and the rubber bladder 2. There are two rubber rings 5, which are fixed between the valve seat 6 and the guide cover 8 and the tail support seat 4 to maintain the sealing state between them. The valve seat 6 is fixed on the guide cover 8 and the tail support seat 4. When the valve is closed, the water pressure in the control chamber 13 will increase, and the valve seat 6 cooperates with the rubber bladder 2 to seal, which can cut off the water pressure of the inlet and outlet. The reset spring 7 It is sleeved in the middle position of the rubber bladder 2, mainly to easily reset the rubber bladder 2 under the action of the spring when the control chamber 13 loses pressure; the deflector 8 is fixed at the inlet of the valve body, and has half the supporting force and fixing effect on the rubber bladder 2 and the valve seat 6; the needle valve 9 is fixed on the inlet side of the basic valve, the needle valve 9 piping inlet is connected to the inlet side of the basic valve, and the outlet is connected to the control chamber 13; the piping 10 mainly refers to various long and short pipes connecting the inlet cavity and the outlet cavity, and the needle valve 9, the ball valve 11, and the pilot valve 12 are arranged in the pipeline to adjust the pressure and movement of the control chamber 13; the ball valve 11 is fixed between the needle valve 9 and the pilot valve 12, biased to the outlet side, and is used to open and close the conduction of the piping; the pilot valve 12 is fixed at the outlet end of the basic valve to mainly adjust the pressure change of its control chamber 13.

[0064] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. An axial flow basic valve, characterized in that: It comprises a valve body (1), a rubber bladder (2), a perforated mesh cover (3), a tail support seat (4), a valve seat (6), a return spring (7), a flow guide cover (8), a first valve, a pipe (10) and a second valve; The valve body (1) is a straight-through inner cavity, the guide cover (8) is fixed at the inlet of the valve body (1), the tail support seat (4) is fixed at the outlet of the valve body (1), the valve seat (6) is fixed on the guide cover (8) and the tail support seat (4), and is located between the guide cover (8) and the tail support seat (4), the perforated mesh cover (3) is fixed on the tail support seat (4), and a control cavity (13) is formed between the inner wall of the valve body (1) and the guide cover (8), the valve seat (6) and the tail support seat (4); the rubber bladder (2) is located in the control cavity (13), covers one side surface of the control cavity (13), and is supported by the perforated mesh cover (3); the reset spring (7) is sleeved in the middle position of the rubber bladder (2); One end of the first valve is connected to the inlet end of the valve body (1), and the other end is connected to the control chamber (13) through the pipe (10); one end of the second valve is connected to the outlet end of the valve body (1), and the other end is connected to the control chamber (13) through the pipe (10).

2. An axial flow basic valve according to claim 1, characterized in that: The rubber bladder (2) is a molded elastic rubber sleeve, which contracts when the water pressure in the control chamber (13) increases, and expands when the water pressure in the control chamber (13) decreases, and covers the guide cover (8), the valve seat (6) and the tail support seat (4).

3. An axial flow basic valve according to claim 1, characterized in that: The rubber bladder (2) is a cylindrical structure that is recessed inwards. A fixing groove that matches the return spring (7) is provided in the middle of the rubber bladder (2). A fixing protrusion that is used to connect to the end of the valve body (1) is provided at the end of the rubber bladder (2).

4. An axial flow basic valve according to claim 1, characterized in that: The perforated mesh cover (3) is a stainless steel conical tube of equal thickness.

5. An axial flow basic valve according to claim 1, characterized in that: A rubber ring (5) is provided at the connection between the valve seat (6) and the flow guide cover (8), and at the connection between the valve seat (6) and the tail support seat (4).

6. An axial flow basic valve according to claim 1, characterized in that: The first valve is a needle valve (9).

7. An axial flow basic valve according to claim 1, characterized in that: The second valve is a ball valve (11).

8. An axial flow basic valve according to claim 1, characterized in that: The axial flow basic valve further comprises a pilot valve (12), which is located in a connecting pipeline between the second valve and the outlet end of the valve body (1).

9. An axial flow basic valve according to claim 1, characterized in that: The inlet and outlet ends of the valve body (1) are both provided with standard flanges, and each standard flange is respectively provided with a step for fixing the flow guide cover (8) and the tail support seat (4).

10. An axial flow basic valve according to claim 1, characterized in that: When the first valve is opened and the second valve is closed, the water pressure at the inlet end of the axial flow basic valve enters the valve body (1) and the control chamber (13) respectively, the rubber bladder (2) covers the surfaces of the guide cover (8), the valve seat (6) and the tail support seat (4), and the axial flow basic valve is in a fully closed state; When the first valve is opened and the second valve is opened with an opening not less than 0, the water flow passing through the first valve and the ball valve (11) reaches a balance, the rubber bladder (2) floats in the control chamber (13), and the axial flow basic valve is in a floating state; When the first valve is closed and the second valve is opened, the water pressure in the control chamber (13) is released through the second valve, the rubber bladder (2) covers the inside of the valve body (1), and the axial flow basic valve is in a fully open state.

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