Water flow accurate control valve

Abstract

The utility model belongs to the technical field of medical equipment, and particularly relates to a water flow accurate control valve which comprises a valve body, a main passage and an auxiliary passage branched from the main passage are arranged in the valve body, and a water inlet pressing plate for separating the main passage from the auxiliary passage and a rotatable adjusting flashboard are arranged in the passage at the branch position. The water inlet pressing plate is provided with a water outlet gate through which water in the main channel flows and a water return gate through which water in the auxiliary channel flows, and the water flow of the water outlet gate and the water flow of the water return gate are in a gradual change trend along with blocking during rotation of the adjusting flashboard. The adjusting flashboard can control the flow of water in all the channels under the condition that the main channel and the auxiliary channel circulate at the same time, after the adjusting flashboard rotates, the water outlet gate is increased while the water return gate is reduced so as to increase the water outlet amount, or the water outlet gate is reduced while the water return gate is increased so as to reduce the water outlet amount. The error of flow control is reduced by sharing the total flow through the water return port, and the water flow adjusting precision and sensitivity are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of medical equipment, and particularly relates to a water flow accurate control valve. BACKGROUND

[0002] Ultra-pure water refers to water with a resistivity of 18 MΩ*cm (25 DEG C). Such water has almost no impurities other than water molecules, no bacteria, viruses, chlorine dioxin and other organic matters, and of course no trace elements of minerals required by human bodies, that is, water with almost all atoms except oxygen and hydrogen removed. It can be used in the preparation process of ultra-pure materials (semiconductor component materials, nano fine ceramic materials, etc.) by distillation, deionization, reverse osmosis technology or other appropriate supercritical fine technology. The flow of the ultra-pure water is controlled with high precision in the medical process.

[0003] In the patent CN201391642Y, a backwater valve is disclosed, characterized in that a valve body is provided with a water inlet, a water outlet and a backwater outlet, the inner cavity of the valve body is provided with a plug, a through opening is formed in the plug, the water inlet and the water outlet of the opening have an included angle, the included angle is equal to the included angle between the water inlet and the water outlet of the valve body and the included angle between the water outlet and the backwater outlet, and a rotating rod is connected to the plug. The utility model can control the water outlet, water stop and backwater through the rotating rod, has simple structure, is convenient to operate, has good water sealing property and can effectively prevent the water outlet pipe from icing.

[0004] In the above scheme, the water outlet, water stop and backwater can be controlled through the rotating rod, but due to the structure of the plug, the water outlet, the water inlet and the backwater outlet cannot work at the same time, and the main function of the backwater pipeline, that is, adjusting the water state, is lost. For example, when the water inlet and the water outlet are supplied with water, the water flow can only be adjusted by controlling the angle of the plug, and the backwater outlet cannot participate in the flow adjustment, resulting in a decrease in the precision of the water outlet flow control. UTILITY MODEL CONTENTS

[0005] The utility model aims at the above problems and provides a water flow accurate control valve which can solve the above technical problems.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The water flow accurate control valve comprises a valve body, a main passage and a branch passage are arranged in the valve body, a water inlet pressing plate for separating the main passage and the branch passage and a rotatable adjusting gate plate are arranged in the branch passage, a water outlet gate opening through which the water flow of the main passage passes and a backwater gate opening through which the water flow of the branch passage passes are formed in the water inlet pressing plate, and the water flow of the water outlet gate opening and the backwater gate opening changes in a trend of this decreasing and that increasing when the adjusting gate plate is blocked.

[0008] In the water flow accurate control valve, the valve body comprises a water inlet chamber and a water outlet chamber communicated by the water outlet gate, the water inlet chamber is provided with a water inlet and a sub-pass formed by the water return gate and a water return port, and the water outlet chamber is provided with a water outlet and a main pass formed by the water inlet chamber.

[0009] In the water flow accurate control valve, the water inlet pressure plate is provided with an extension pipe connected with the water return gate, and the extension pipe passes through the water outlet chamber and is connected with the water return port.

[0010] In the water flow accurate control valve, the adjusting gate plate is concentrically abutted on the water inlet pressure plate, and the adjusting gate plate is independently rotated around the center of the water inlet pressure plate and can completely block the water outlet gate or the water return gate.

[0011] In the water flow accurate control valve, when the adjusting gate plate is rotated, the water outlet gate is gradually separated from the blocking of the adjusting gate plate, and the water return gate is gradually blocked by the adjusting gate plate.

[0012] In the water flow accurate control valve, when the adjusting gate plate is rotated, the water return gate is gradually separated from the blocking of the adjusting gate plate, and the water outlet gate is gradually blocked by the adjusting gate plate.

[0013] In the water flow accurate control valve, the valve body is provided with a positioning rod which can be rotated in the circumferential direction, one end of the positioning rod is connected with the center of the adjusting gate plate, and the other end of the positioning rod is connected with a motor arranged outside the valve body.

[0014] In the water flow accurate control valve, one end of the positioning rod is provided with a positioning ring which rotates synchronously, the positioning ring is circumferentially provided with a plurality of convex teeth which are embedded in the grooves arranged at the center of the adjusting gate plate.

[0015] In the water flow accurate control valve, a spring which provides axial elastic force is arranged between the positioning rod and the positioning ring, and the positioning ring pushes the adjusting gate plate to abut on the water inlet pressure plate under the action of the spring.

[0016] In the water flow accurate control valve, the water outlet gate and the water return gate are respectively arranged on the two sides of the center of the water inlet pressure plate.

[0017] The water flow accurate control valve has the following advantages:

[0018] The regulating gate can control the flow rate in each channel when the main channel and the secondary channel are flowing simultaneously. After the regulating gate is rotated, the outlet gate increases while the return gate decreases to increase the outflow, or the outlet gate decreases while the return gate increases to decrease the outflow. By using the return port to distribute the total flow, the error in flow control is reduced, and the accuracy and sensitivity of water flow regulation are improved. Attached Figure Description

[0019] Fig. 1 This is a schematic diagram of the overall structure of this utility model.

[0020] Fig. 2 This is an exploded view of the structure of this utility model.

[0021] Fig. 3 This is a schematic diagram of the internal structure of this utility model.

[0022] In the diagram, the components are: valve body 1, inlet chamber 11, outlet chamber 12, return port 13, inlet port 14, outlet port 15, inlet pressure plate 2, outlet gate 21, return gate 22, extension connecting pipe 23, regulating gate 3, positioning rod 31, positioning ring 32, spring 33, and motor 4. Detailed Implementation

[0023] The following are specific embodiments of the utility model, which are described in conjunction with the accompanying drawings to further illustrate the technical solution of the utility model. However, the utility model is not limited to these embodiments.

[0024] like Figs. 1-3 As shown, the water flow precision control valve includes a valve body 1. The valve body 1 is provided with a main passage and a branch passage. In the branch passage, there is an inlet pressure plate 2 that separates the main passage and the branch passage, and a rotatable regulating gate 3. The inlet pressure plate 2 has an outlet gate 21 through which the water flows in the main passage and a return gate 22 through which the water flows in the branch passage. The water flow of the outlet gate 21 and the return gate 22 changes with the resistance of the regulating gate 3 as it rotates.

[0025] The inlet pressure plate is fixed as a flow path separator and has two openings for different channels. The regulating gate is a rotating part that is coaxially fitted with the pressure plate. By partially blocking the outlet / return water inlet, the flow rate is adjusted to achieve proportional regulation flow control, which is suitable for the distribution control of two outlets.

[0026] In this embodiment, the valve body 1 includes an inlet chamber 11 and an outlet chamber 12 connected by an outlet gate 21. The inlet chamber 11 has an inlet 14 and is connected to the return port 13 through a return gate 22 to form a secondary passage. The outlet chamber 12 has an outlet 15 and forms a main passage with the inlet chamber 11.

[0027] The water inlet cavity is the inlet area of the valve body. After the fluid enters, part of it is distributed to the main and auxiliary channels and flows into the extension pipe through the backwater gate on the pressure plate and then into the backwater outlet. The design adopts multiple cavities to separate and control the main backwater path and enhance the independence of regulation.

[0028] In this embodiment, the extension connecting pipe 23 that communicates with the backwater gate 22 is arranged on the water inlet pressure plate 2 and connected with the backwater outlet 13 through the water outlet chamber 12.

[0029] The diversion pipe is arranged below the pressure plate to guide the backwater of the auxiliary channel to pass through the water outlet chamber. The pipe is made of stainless steel or engineering plastic and is heat-welded or sealed with screws to prevent leakage.

[0030] In this embodiment, the adjustment gate 3 is concentrically abutted on the water inlet pressure plate 2. The adjustment gate 3 rotates independently around the center of the water inlet pressure plate 2 and can completely block the water outlet gate 21 or the backwater gate 22.

[0031] The contact surface between the adjustment gate and the pressure plate has high flatness to improve the anti-leakage performance therebetween. The adjustment is limited to an angle range of 180° through the rotation center shaft and can be limited by a limiting pin or a limiting tooth. The completely blocked state is used to realize the single on-off flow function, such as the cleaning / switching backwater function.

[0032] In this embodiment, when the adjustment gate 3 rotates, the water outlet gate 21 gradually escapes from the blockage of the adjustment gate 3; and the backwater gate 22 is gradually blocked by the adjustment gate 3.

[0033] When the adjustment gate 3 rotates, the backwater gate 22 gradually escapes from the blockage of the adjustment gate 3; and the water outlet gate 21 is gradually blocked by the adjustment gate 3.

[0034] When the flow needs to be increased, the shielding arc-shaped area on the adjustment gate gradually releases the water outlet while shielding the backwater outlet, which is used for gradually increasing the main output pressure / flow.

[0035] When the flow needs to be reduced, the shielding arc-shaped area on the adjustment gate gradually releases the backwater outlet while shielding the water outlet, which is used for gradually reducing the main output pressure / flow. The backflow pipe can also be opened in advance during the start-stop transition stage of the water pump to prevent system vibration.

[0036] In this embodiment, the positioning rod 31 that can rotate circumferentially is arranged on the valve body 1. One end of the positioning rod 31 is connected with the center of the adjustment gate 3, and the other end of the positioning rod 31 is connected with the motor 4 arranged outside the valve body 1.

[0037] The positioning rod penetrates through the center of the valve cover and is fixedly connected with the gate to drive the rotation thereof. The external part can be controlled by a stepping motor or a servo motor to realize precise positioning and regulation and realize closed-loop control in cooperation with a PLC or a flow sensor.

[0038] In the embodiment, one end of the positioning rod 31 is provided with a co-rotating positioning ring 32, which is circumferentially provided with a plurality of convex teeth embedded in the recesses formed at the center of the adjusting gate 3.

[0039] The positioning ring is provided with a spline connection or tooth coupling structure to prevent rotation slip and ensure power transmission, and can be easily disassembled and separated during maintenance and cleaning.

[0040] In the embodiment, a spring 33 providing axial elastic force is arranged between the positioning rod 31 and the positioning ring 32, and the positioning ring 32 pushes the adjusting gate 3 against the water inlet pressure plate 2 under the action of the spring 33.

[0041] The spring is used to compensate for the axial gap caused by thermal expansion or wear to ensure the sealing fit between the adjusting gate and the water inlet pressure plate. The spring compression force should not be too large to prevent excessive friction during adjustment.

[0042] In the embodiment, the water outlet gate 21 and the backwater gate 22 are respectively arranged to support the two sides of the center of the water inlet pressure plate 2.

[0043] Symmetrical arrangement makes the flow regulation curve of the adjusting gate symmetrical within a range of 90°, which helps to optimize the operation logic and facilitate automatic program control.

[0044] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. Water flow precision control valve comprising a valve body (1), characterized in that, The valve body (1) is provided with a main passage and a branch passage, a water inlet pressure plate (2) and a rotatable adjusting gate (3) are arranged in the branch passage to separate the main passage and the branch passage, the water inlet pressure plate (2) is provided with a water outlet gate (21) through which water flows in the main passage and a backwater gate (22) through which water flows in the branch passage, and the water flow of the water outlet gate (21) and the backwater gate (22) changes in a trend of this decreasing and that increasing when the adjusting gate (3) is rotated.

2. The precision control valve for water flow according to claim 1, wherein The valve body (1) comprises a water inlet chamber (11) and a water outlet chamber (12) which are communicated by the water outlet gate (21), the water inlet chamber (11) is provided with a water inlet (14) and is communicated with a backwater outlet (13) through the backwater gate (22) to form a branch passage, and the water outlet chamber (12) is provided with a water outlet (15) to form a main passage with the water inlet chamber (11).

3. The precision control valve of claim 2, wherein The water inlet pressure plate (2) is provided with an extension connecting pipe (23) which communicates with the backwater gate (22), and the extension connecting pipe (23) passes through the water outlet chamber (12) and is connected with the backwater outlet (13).

4. The precision water flow control valve of claim 1, wherein, The adjusting gate (3) is concentrically abutted on the water inlet pressure plate (2), the adjusting gate (3) is independently rotated with the center of the water inlet pressure plate (2) and can completely block the water outlet gate (21) or the backwater gate (22).

5. The precision water flow control valve of claim 4, wherein, When the adjusting gate (3) is rotated, the water outlet gate (21) gradually escapes from the block of the adjusting gate (3); and the backwater gate (22) is gradually blocked by the adjusting gate (3).

6. The precision water flow control valve of claim 4, wherein, When the adjusting gate (3) is rotated, the backwater gate (22) gradually escapes from the block of the adjusting gate (3); and the water outlet gate (21) is gradually blocked by the adjusting gate (3).

7. The precision control valve of claim 1, wherein A positioning rod (31) which can be rotated in a circumferential direction is arranged on the valve body (1), one end of the positioning rod (31) is connected with the center of the adjusting gate (3), and the other end of the positioning rod (31) is connected with a motor (4) arranged outside the valve body (1).

8. The precision water flow control valve of claim 7, wherein, One end of the positioning rod (31) is provided with a positioning ring (32) which rotates synchronously, the positioning ring (32) is circumferentially provided with a plurality of convex teeth which are fitted into grooves arranged in the center of the adjusting gate (3).

9. The precision control valve of claim 8, wherein, A spring (33) which provides an axial elastic force is arranged between the positioning rod (31) and the positioning ring (32), and the positioning ring (32) pushes the adjusting gate (3) to abut on the water inlet pressure plate (2) under the action of the spring (33).

10. The precision control valve of claim 1, wherein, The water outlet gate (21) and the backwater gate (22) are respectively arranged on both sides of the center of the water inlet pressure plate (2).

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