Axial-flow type diaphragm hydraulic control valve

Abstract

The axial-flow type diaphragm hydraulic control valve comprises a left valve body, a valve seat, a valve element assembly, a spring, a right valve body and a piping assembly, the valve seat is installed at the inlet end of the left valve body, a hollow boss and a half of a control cavity are arranged in the left valve body, a through hole is formed in the control cavity in the left valve body, and the valve element assembly is installed in the through hole. The other half of the control cavity is arranged in the right valve body, and the left valve body is connected with the right valve body. The valve element assembly comprises a valve disc, a valve shaft, a forming diaphragm and a diaphragm pressing plate. The piping assembly comprises a pipe fitting, a first valve and a second valve. Compared with the prior art, the valve has the advantages of being simple in structure, flexible to open and close, stable in flow state, resistant to cavitation, small in vibration, capable of preventing incrustation, capable of eliminating the turbulence phenomenon and the like.

Description

Technical Field

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

[0002] A hydraulic control valve is a valve that uses water pressure, kinetic energy and potential energy for control. There are generally two types of hydraulic control valves on the market:

[0003] The first is the traditional "S" type hydraulic control valve, which uses bottom-in and top-out, and the flow pattern is extremely unstable;

[0004] The second type is a crooked-neck hydraulic control valve, which uses a 45° water inlet and 45° water outlet, and the flow pattern is also unstable;

[0005] Disadvantages of traditional "S" type hydraulic control valve and crooked neck hydraulic control valve:

[0006] 1. The shape is complex, the processing procedures are numerous, and the processing accuracy is also required to be high;

[0007] 2. Fluid medium, generating turbulence and high flow resistance;

[0008] 3. When overcurrent occurs, the noise and vibration are relatively large;

[0009] 4. Prone to cavitation and scaling. Summary of the invention

[0010] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide an axial flow diaphragm hydraulic control valve with simple structure, stable flow state and flexible switching.

[0011] The purpose of the present invention can be achieved by the following technical solutions:

[0012] An axial flow diaphragm hydraulic control valve, comprising a left valve body, a valve seat, a valve core assembly, a spring, a right valve body and a pipe assembly, wherein the valve seat is mounted on the inlet end of the left valve body, a hollow boss and half of a control cavity are arranged inside the left valve body, a through hole is arranged in the control cavity inside the left valve body, the other half of the control cavity is arranged inside the right valve body, and the left valve body and the right valve body are connected to each other;

[0013] The valve core assembly includes a valve disc, a valve shaft, a molded diaphragm and a diaphragm pressure plate. One end of the valve shaft is connected to the valve disc, and the other end is connected to the molded diaphragm and the diaphragm pressure plate. The valve disc matches the shape of the inlet end of the left valve body. The molded diaphragm and the diaphragm pressure plate, the molded diaphragm is also connected to the inside of the control cavity, and the diaphragm pressure plate matches the shape of the through hole of the control cavity. The spring is located outside the valve shaft, and one end is connected to the valve disc, and the other end is supported by the boss. The valve shaft passes through the boss and then extends into the control cavity.

[0014] The piping assembly includes a pipe fitting, a first valve and a second valve. One end of the first valve is connected to the inlet end of the left valve body through the pipe fitting, and the other end is connected to the control chamber through the pipe fitting; one end of the second valve is connected to the control chamber through the pipe fitting, and the other end is connected to the outlet end of the right valve body.

[0015] Furthermore, the left valve body is a streamlined trumpet-shaped structure, one end of which is a standard water inlet flange and the other end is a middle flange. An O-type sealing groove is provided in the connecting surface between the middle flange and the right valve body, and a first O-ring is provided in the O-type sealing groove.

[0016] Furthermore, the valve seat is a stainless steel annular structure, and a plurality of water filtering holes are distributed in the circumferential direction of the valve seat.

[0017] Furthermore, the valve core assembly further comprises a nut and a second O-ring, the valve disc is fixed to one end of the valve shaft through the nut, and the second O-ring is arranged on the connecting surface between the valve disc and the valve shaft;

[0018] The molded diaphragm and the diaphragm pressing plate are fixed to each other and connected to one end of the valve shaft.

[0019] Furthermore, the valve disc is covered with rubber around its periphery.

[0020] Furthermore, the molded diaphragm is an inverted bowl-shaped structure, the outer edge of which is connected to the inner side of the control cavity, and the bottom is fixed to one end of the valve shaft by a diaphragm pressure plate.

[0021] Furthermore, the ratio of the force-bearing area of ​​the diaphragm pressure plate to the force-bearing area of ​​the valve disc is 1.3:1.

[0022] Furthermore, the axial flow diaphragm hydraulic control valve also includes a copper sleeve, the outer circle of which is fixed in the boss in the middle of the left valve body, and the inner hole of the copper sleeve is a guide hole of the valve core assembly.

[0023] Furthermore, the piping assembly further comprises a pilot valve, which is located on the pipeline between the second valve and the outlet end of the right valve body, one end of the pilot valve is connected to the second valve through a pipe fitting, and the other end of the pilot valve is connected to the outlet end of the right valve body through a pipe fitting;

[0024] The first valve is a needle valve, and the second valve is a ball valve.

[0025] Further, when the first valve is opened and the second valve is closed, the axial flow diaphragm hydraulic control valve is in a fully closed state;

[0026] When the first valve is closed and the second valve is opened, the axial flow diaphragm hydraulic control valve is in a fully open state;

[0027] When the first valve and the second valve are both opened, the axial flow diaphragm hydraulic control valve is in a floating state.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] (1) The axial flow diaphragm hydraulic control valve provided by the present invention has a control chamber and a valve core assembly arranged inside the left valve body and the right valve body. One end of the valve shaft in the valve core assembly forms a seal with the inlet end of the left valve body through the valve disc, and the other end seals the control chamber through the molded diaphragm and the diaphragm pressure plate. The molded diaphragm moves, and the positioning guide of the copper sleeve and the spring act to drive the valve shaft and the valve disc to move, thereby realizing the switch function of the hydraulic control valve.

[0030] A pipe fitting is arranged outside the valve body, which connects the inlet end of the left valve body with the control chamber and is controlled by a needle valve on one hand; and connects the outlet end of the right valve body with the control chamber and is controlled by a ball valve on the other hand; by controlling the opening and closing of the ball valve and the needle valve, the water pressure in the control chamber is controlled, and the switch of the control valve can be realized;

[0031] On the whole, the present invention has the advantages of simple structure, flexible switching, stable flow, anti-cavitation, small vibration, anti-scaling, elimination of turbulence, etc.

[0032] (2) The axial flow diaphragm hydraulic control valve of the present invention is used as a basic valve and can be piped according to different functional requirements and configured as a pressure reducing valve, a pressure relief valve, a float water level valve, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of an axial flow diaphragm hydraulic control valve provided in an embodiment of the present invention;

[0034] Figure 2 It is a schematic structural diagram of a fully closed state of an axial flow diaphragm hydraulic control valve provided in an embodiment of the present invention;

[0035] Figure 3 It is a schematic diagram of the floating state structure of an axial flow diaphragm hydraulic control valve provided in an embodiment of the present invention;

[0036] Figure 4 It is a schematic structural diagram of a fully open state of an axial flow diaphragm hydraulic control valve provided in an embodiment of the present invention;

[0037] In the figure, 1, left valve body, 2, valve seat, 3, valve core assembly, 4, spring, 5, copper sleeve, 6, first O-ring, 7, right valve body, 8, piping assembly, 9, control chamber, 3-1, nut, 3-2, second O-ring, 3-3, valve disc, 3-4, valve shaft, 3-5, molded diaphragm, 3-6 diaphragm pressure plate, 8-1, guide valve, 8-2, ball valve, 8-3, pipe fittings, 8-4, needle valve. DETAILED DESCRIPTION

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment provides an axial flow diaphragm hydraulic control valve, including a left valve body 1, a valve seat 2, a valve core assembly 3, a spring 4, a right valve body 7 and a piping assembly 8, the valve seat 2 is installed at the inlet end of the left valve body 1, a hollow boss and half of a control cavity 9 are provided inside the left valve body 1, the control cavity 9 in the left valve body 1 is provided with a through hole, the other half of the control cavity 9 is provided inside the right valve body 7, and the left valve body 1 and the right valve body 7 are connected to each other;

[0045] The valve core assembly 3 includes a valve disc 3-3, a valve shaft 3-4, a molded diaphragm 3-5 and a diaphragm pressure plate 3-6. One end of the valve shaft 3-4 is connected to the valve disc 3-3, and the other end is connected to the molded diaphragm 3-5 and the diaphragm pressure plate 3-6. The valve disc 3-3 matches the shape of the inlet end of the left valve body 1. The molded diaphragm 3-5 and the diaphragm pressure plate 3-6, the molded diaphragm 3-5 is also connected to the inside of the control chamber 9, and the diaphragm pressure plate 3-6 matches the shape of the through hole of the control chamber 9; the spring 4 is located outside the valve shaft 3-4, and one end is connected to the valve disc 3-3, and the other end is supported by the boss. The valve shaft 3-4 penetrates the boss and then extends into the control chamber 9;

[0046] The piping assembly 8 includes a pipe fitting 8-3, a first valve and a second valve. One end of the first valve is connected to the inlet end of the left valve body 1 through the pipe fitting 8-3, and the other end is connected to the control chamber 9 through the pipe fitting 8-3; one end of the second valve is connected to the control chamber 9 through the pipe fitting 8-3, and the other end is connected to the outlet end of the right valve body 7.

[0047] Specifically, in this embodiment, the first valve is a needle valve 8 - 4 , and the second valve is a ball valve 8 - 2 .

[0048] The left valve body 1 is a streamlined trumpet-shaped structure, one end of which is a standard water inlet flange and the other end is a middle flange. An O-type sealing groove is provided in the connecting surface between the middle flange and the right valve body 7, and a first O-type ring 6 is provided in the O-type sealing groove.

[0049] The first O-ring 6 is provided as a static seal between the flanges of the left valve body 1 and the right valve body 7 .

[0050] A boss and a rib plate are provided in the left valve body 1 for accommodating the inner valve core assembly 3 and half of the control chamber 9.

[0051] The valve seat 2 is a stainless steel annular structure, fixed to the inlet end of the left valve body 1, and is used as a sealing surface of the main sealing pair. A number of 2mm small holes are drilled in the circumferential direction of the valve seat 2 to filter the water quality.

[0052] The valve core assembly 3 also includes a nut 3-1 and a second O-ring 3-2. The valve disc 3-3 is fixed to one end of the valve shaft 3-4 through the nut 3-1. The second O-ring 3-2 is arranged on the connecting surface between the valve disc 3-3 and the valve shaft 3-4.

[0053] The molded diaphragm 3-5 and the diaphragm pressing plate 3-6 are fixed to each other and connected to one end of the valve shaft 3-4.

[0054] As a whole, one end of the valve core assembly 3 is the main valve core, and the other end is the piston of the control chamber 9, wherein the outer surface of the valve disc 3-3 is vulcanized and coated with rubber into one piece, with a second O-ring 3-2 in the middle, which is fixed to one end of the valve shaft 3-4 with a nut 3-1, and the molded diaphragm 3-5 and the diaphragm pressure plate 3-6 at the other end of the valve shaft 3-4 are fixed together with nuts, which are used to operate the piston of the control chamber 9.

[0055] The valve disc 3-3 is covered with rubber to prevent the valve disc from scaling and play a role of soft sealing.

[0056] The molded diaphragm 3-5 is an inverted bowl-shaped structure, with its outer edge connected to the inner side of the control chamber 9 and its bottom fixed to one end of the valve shaft 3-4 by the diaphragm pressure plate 3-6, so that the molded diaphragm 3-5 is easy to stretch and has a wear-resistant effect, and can be better used to control fluid tension and fluid floating.

[0057] The ratio of the force bearing area of ​​the diaphragm pressure plate 3-6 to the force bearing area of ​​the valve disc 3-3 is 1.3:1.

[0058] The spring 4 is arranged on the valve shaft, one end of which contacts the valve disc 3-3 of the valve core assembly, and the other end is positioned at the boss in the middle of the left valve body 1. It is preferably made of stainless steel and mainly plays the role of resetting the valve disc 3-3.

[0059] Preferably, the axial flow diaphragm hydraulic control valve also includes a copper sleeve 5, the outer circle of which is fixed in the boss in the middle of the left valve body 1, the inner hole of the copper sleeve 5 is the guide hole of the valve core assembly 3, and together with the boss in the middle of the left valve body 1 serves as the piston area of ​​the control chamber 9 and the limit of the full closure of the valve core assembly.

[0060] The right valve body 7 serves as the outlet valve body, mainly containing the other half of the control chamber 9 inside, and serves as a limit for the full opening of the valve core assembly.

[0061] The pipe assembly 8 also includes a pilot valve 8-1, one end of which is connected to the second valve via a pipe fitting 8-3, and the other end of which is connected to the outlet end of the right valve body 7 via a pipe fitting 8-3;

[0062] The first valve is a needle valve 8 - 4 , and the second valve is a ball valve 8 - 2 .

[0063] One end of the needle valve 8-4 is communicated with the valve seat and the inlet end of the left valve body 1, and the other end is communicated with the control chamber 9 at the connection between the left valve body 1 and the right valve body 7;

[0064] One end of the ball valve 8-2 is communicated with the valve seat and the inlet end of the right valve body 7, and the other end is communicated with the control chamber 9 at the connection between the left valve body 1 and the right valve body 7;

[0065] The control chamber 9 is connected to the left valve body 1, the guide valve 8-1, the ball valve 8-2, the pipe 8-3, the needle valve 8-4, the right valve body 7 and the outlet end in sequence, and is used to control the valve to obtain the required pressure and flow.

[0066] Taking the following scheme as an example, the working state of the axial flow diaphragm hydraulic control valve is explained.

[0067] This example is an axial flow diaphragm hydraulic control valve, which is used as a basic valve and is externally equipped with a throttling needle valve, a pilot valve, a ball valve and piping; the force area of ​​the diaphragm pressure plate of the control chamber 9 is 1.3:1 with the force area of ​​the valve disc; one end of the needle valve is connected to the valve seat and the inlet end of the left valve body 1; the other end of the needle valve is connected to the control chamber 9 at the connection between the left valve body 1 and the right valve body 7; the control chamber 9 is connected to the left valve body, the ball valve, the pilot valve, the right valve body and the outlet end in turn; a number of 2mm small holes are drilled in the circumferential direction of the stainless steel valve seat to filter the water quality; the valve disc is covered with rubber to prevent the valve disc from scaling and play a role of soft sealing; the rubber molded diaphragm adopts a corrugated design, which makes the diaphragm easy to stretch and play a role of wear resistance; the corresponding working conditions are as follows:

[0068] Fully closed state: Figure 2 As shown, when the water pressure at the inlet end of the control valve enters the valve body, the needle valve 8-4 is opened, the water pressure enters the control chamber 9, and the external ball valve 8-2 is closed; the control valve is in a closed state;

[0069] Fully open state: Figure 3 As shown, when the needle valve 8-4 at the inlet end of the control valve is closed and the ball valve 8-2 is opened, the water pressure in the control chamber 9 is fully released to the outlet end, and the control valve is in a fully open state;

[0070] Floating state: Figure 4 As shown, when the ball valve 8-2 at the outlet end of the control valve is opened, the water flow through the needle valve 8-4 and the ball valve 8-2 reaches a balance, and the valve disc 3-3 is in a balanced state under the action of the spring and the water flow, that is, the water flow of the needle valve and the ball valve is balanced, and the water flow of the spring and the valve core is hydraulically balanced. At this time, the control valve is in a floating state.

[0071] 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 diaphragm hydraulic control valve, characterized in that: The invention comprises a left valve body (1), a valve seat (2), a valve core assembly (3), a spring (4), a right valve body (7) and a pipe assembly (8), wherein the valve seat (2) is installed at the inlet end of the left valve body (1), a hollow boss and half of a control chamber (9) are provided inside the left valve body (1), the control chamber (9) inside the left valve body (1) is provided with a through hole, the other half of the control chamber (9) is provided inside the right valve body (7), and the left valve body (1) and the right valve body (7) are connected to each other; The valve core assembly (3) comprises a valve disc (3-3), a valve shaft (3-4), a molded diaphragm (3-5) and a diaphragm pressure plate (3-6); one end of the valve shaft (3-4) is connected to the valve disc (3-3), and the other end is connected to the molded diaphragm (3-5) and the diaphragm pressure plate (3-6); the valve disc (3-3) matches the shape of the inlet end of the left valve body (1); the molded diaphragm (3-5) and the diaphragm pressure plate (3-6); the molded diaphragm (3-5) is also connected to the inside of the control chamber (9); the diaphragm pressure plate (3-6) matches the shape of the through hole of the control chamber (9); the spring (4) is located on the outside of the valve shaft (3-4), and one end is connected to the valve disc (3-3), and the other end is supported by the boss; the valve shaft (3-4) penetrates the boss and then extends into the control chamber (9); The piping assembly (8) comprises a pipe fitting (8-3), a first valve and a second valve; one end of the first valve is connected to the inlet end of the left valve body (1) through the pipe fitting (8-3), and the other end is connected to the control chamber (9) through the pipe fitting (8-3); one end of the second valve is connected to the control chamber (9) through the pipe fitting (8-3), and the other end is connected to the outlet end of the right valve body (7).

2. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: The left valve body (1) is a streamlined trumpet-shaped structure, one end of which is a standard water inlet flange and the other end is a middle flange. An O-type sealing groove is provided in the connection surface between the middle flange and the right valve body (7), and a first O-type ring (6) is provided in the O-type sealing groove.

3. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: The valve seat (2) is a stainless steel annular structure, and a plurality of water filtering holes are distributed in the circumferential direction of the valve seat (2).

4. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: The valve core assembly (3) further comprises a nut (3-1) and a second O-ring (3-2); the valve disc (3-3) is fixed to one end of the valve shaft (3-4) via the nut (3-1); and the second O-ring (3-2) is arranged on the connection surface between the valve disc (3-3) and the valve shaft (3-4); The molded diaphragm (3-5) and the diaphragm pressing plate (3-6) are fixed to each other and then connected to one end of the valve shaft (3-4).

5. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: The valve disc (3-3) is covered with rubber all around.

6. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: The molded diaphragm (3-5) is an inverted bowl-shaped structure, with an outer edge connected to the inner side of the control cavity (9) and a bottom fixed to one end of the valve shaft (3-4) by a diaphragm pressure plate (3-6).

7. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: The ratio of the force bearing area of ​​the diaphragm pressure plate (3-6) to the force bearing area of ​​the valve disc (3-3) is 1.3:

1.

8. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: The axial flow diaphragm hydraulic control valve also includes a copper sleeve (5), the outer circle of which is fixed in a boss in the middle of the left valve body (1), and the inner hole of the copper sleeve (5) is a guide hole of the valve core assembly (3).

9. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: The pipe assembly (8) further comprises a pilot valve (8-1), which is located on the pipeline between the second valve and the outlet end of the right valve body (7), one end of which is connected to the second valve through the pipe fitting (8-3), and the other end of which is connected to the outlet end of the right valve body (7) through the pipe fitting (8-3); The first valve is a needle valve (8-4), and the second valve is a ball valve (8-2).

10. The axial flow diaphragm hydraulic control valve according to claim 1, characterized in that: When the first valve is opened and the second valve is closed, the axial flow diaphragm hydraulic control valve is in a fully closed state; When the first valve is closed and the second valve is opened, the axial flow diaphragm hydraulic control valve is in a fully open state; When the first valve and the second valve are both opened, the axial flow diaphragm hydraulic control valve is in a floating state.

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