Diaphragm type control valve

Abstract

The utility model discloses a diaphragm type control valve, belongs to the technical field of valves, and solves the problem that a diaphragm cannot push a valve element to be tightly attached to the inner wall of a valve body through a valve rod to block a flow channel in the valve body if the liquid amount in the space above the diaphragm is insufficient. Comprising a valve body, a valve cover fixedly connected to the valve body and a valve bonnet fixedly connected to the valve cover, a membrane is fixedly connected between the valve cover and the valve bonnet, the space between the valve cover and the valve bonnet is divided into an upper space and a lower space through the membrane, the lower space is communicated with a feeding port of the valve body through a first water pipe, and the upper space is communicated with a discharging port of the valve body through a second water pipe. And a third water pipe communicated with the upper space is communicated with the lowest horizontal height of the discharge hole of the valve body. The valve core displaces to adjust the flow channel, the spring releases elastic potential energy to cope with flow reduction, the flow sensor detects and triggers the controller to operate the relay, the water pump is kept working, sufficient liquid in the upper space is ensured, and leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a diaphragm type control valve. Background Art

[0002] The diaphragm control valve is characterized by the use of a flexible diaphragm as a sealing element, which can provide good sealing performance and effectively prevent medium leakage. The diaphragm control valve is mainly composed of a valve body, a diaphragm, a valve stem, a valve cover, a valve core and other components. The material of the diaphragm is usually selected according to the characteristics of the medium, such as corrosion-resistant rubber or polytetrafluoroethylene.

[0003] When eliminating the water hammer phenomenon, the liquid at the feed port will impact the valve core, and the valve core will push the valve stem, which will cause the diaphragm to deform, thereby changing the space on both sides of the diaphragm in the valve cover and adjusting the amount of liquid therein. However, if there is insufficient liquid in the space above the diaphragm, the diaphragm cannot push the valve core through the valve stem to fit tightly against the inner wall of the valve body and block the flow channel in the valve body. In this way, the diaphragm control valve will also have a slight leakage.

[0004] Therefore, a diaphragm control valve is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The utility model aims to solve the shortcomings in the prior art and proposes a diaphragm control valve.

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

[0007] A diaphragm control valve comprises a valve body, a valve cover fixedly connected to the valve body, and a valve bonnet fixedly connected to the valve cover, a diaphragm fixedly connected between the valve cover and the valve bonnet, the valve cover and the valve bonnet are divided into an upper space and a lower space by the diaphragm, the lower space is connected to a feed port of the valve body through a first water pipe, the upper space is connected to a feed port of the valve body through a second water pipe, a third water pipe connected to the upper space is connected at the lowest level of the feed port of the valve body, a flow sensor and a water pump are connected to the third water pipe, and the flow sensor controls the operation of the water pump through a flow control circuit.

[0008] Preferably, the flow control circuit includes a voltage comparison circuit, a trigger circuit, a controller, a decoder, and a relay. The output end of the flow sensor is coupled to the input end of the voltage comparison circuit, the output end of the voltage comparison circuit is coupled to the input end of the trigger circuit, the output end of the trigger circuit is coupled to the input end of the controller, the output end of the controller is coupled to the input end of the decoder, the output end of the decoder is coupled to the input end of the relay, and the relay controls the power on and off of the water pump.

[0009] Preferably, the flow control circuit further includes an amplifier circuit, and the amplifier circuit is coupled between the flow sensor and the voltage comparison circuit.

[0010] Preferably, the amplification circuit is an operational amplifier, the voltage comparison circuit is a voltage comparator, the trigger circuit is an RS trigger, and the controller is an STM32 single-chip microcomputer.

[0011] Preferably, the first water pipe is connected to a first solenoid valve and a first filter.

[0012] Preferably, the second water pipe is connected to a second solenoid valve and a second filter.

[0013] Preferably, it also includes an upper clamping plate and a lower clamping plate, which are clamped on both sides of the diaphragm, and are fixedly connected to a valve stem that passes through the valve cover, and the lower end of the valve stem is fixedly connected to a valve core.

[0014] The utility model has the following beneficial effects:

[0015] The utility model adjusts the flow channel by displacement of the valve core, and the spring releases elastic potential energy to cope with the flow reduction. The flow sensor detects and triggers the controller to operate the relay to keep the water pump working, ensuring that the amount of liquid in the upper space is sufficient to avoid leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2 It is a structural block diagram of the flow control circuit in the utility model.

[0019] 1. Valve body; 2. Valve cover; 3. Valve bonnet; 4. Diaphragm; 5. Upper clamping plate; 6. Lower clamping plate; 7. Valve stem; 8. First water pipe; 9. First filter; 10. First solenoid valve; 11. Second water pipe; 12. Second filter; 13. Second solenoid valve; 14. Third water pipe; 15. Flow sensor; 16. Water pump; 17. Amplifier circuit; 18. Voltage comparison circuit; 19. Trigger circuit; 20. Controller; 21. Decoder; 22. Relay. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] 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 present invention to be protected, 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.

[0022] 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.

[0023] In the description of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.

[0024] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] A diaphragm control valve, such as Figure 1As shown, it includes a valve body 1, a valve cover 2 fixedly connected to the valve body 1, a valve cap 3 fixedly connected to the valve cover 2, an upper clamping plate 5 and a lower clamping plate 6, a diaphragm 4 is fixedly connected between the valve cover 2 and the valve cap 3, the upper clamping plate 5 and the lower clamping plate 6 are clamped on both sides of the diaphragm 4, the upper clamping plate 5 and the lower clamping plate 6 are fixedly connected with a valve stem 7 that penetrates the valve cover 2, and a valve core is fixedly connected to the lower end of the valve stem 7, the valve cover 2 and the valve cap 3 are divided into an upper space and a lower space by the diaphragm 4, and the lower space is connected to the valve cover 2 through a first water pipe 8. The feed port of the valve body 1 is connected, the first water pipe 8 is connected with the first solenoid valve 10 and the first filter 9, the upper space is connected with the discharge port of the valve body 1 through the second water pipe 11, the second water pipe 11 is connected with the second solenoid valve 13 and the second filter 12, the lowest level of the discharge port of the valve body 1 is connected with the third water pipe 14 connected with the upper space, the third water pipe 14 is connected with the flow sensor 15 and the water pump 16, and the flow sensor 15 controls the operation of the water pump 16 through the flow control circuit.

[0027] like Figure 2 As shown, the flow control circuit includes a voltage comparison circuit 18, an amplifier circuit 17, a trigger circuit 19, a controller 20, a decoder 21, and a relay 22. The output end of the flow sensor 15 is coupled to the input end of the voltage comparison circuit 18, the amplifier circuit 17 is coupled between the flow sensor 15 and the voltage comparison circuit 18, the output end of the voltage comparison circuit 18 is coupled to the input end of the trigger circuit 19, the output end of the trigger circuit 19 is coupled to the input end of the controller 20, the output end of the controller 20 is coupled to the input end of the decoder 21, the output end of the decoder 21 is coupled to the input end of the relay 22, the relay 22 controls the power on and off of the water pump 16, the amplifier circuit 17 is an operational amplifier, the voltage comparison circuit 18 is a voltage comparator, the trigger circuit 19 is an RS trigger, and the controller 20 is an STM32 microcontroller.

[0028] When the utility model is actually used, usually liquid enters the flow channel therein from the feed port of the valve body 1 and impacts the valve core, so that the valve core drives the valve stem 7 to move, and the valve stem 7 drives the diaphragm 4 to deform through the upper clamping plate 5 and the lower clamping plate 6, and then adjusts the volume of the upper space and the lower space. At this time, the volume of the upper space is reduced, and the volume of the lower space is increased. Water is flushed into the lower space through the first water pipe 8, and the water in the upper space is sent to the discharge port of the valve body 1 through the second water pipe 11. At this time, the valve core opens the flow channel in the valve body 1. However, if the amount of liquid decreases, the spring sleeved on the outside of the valve stem 7 will release elastic potential energy, drive the valve core, valve stem 7, upper clamping plate 5 and lower clamping plate 6 to move, so that the diaphragm 4 is deformed, and then the volume of the upper space is increased and the volume of the lower space is reduced. At this time, the valve core closes the flow channel in the valve body 1 again, and In this process, the flow sensor 15 will detect the decrease in flow rate and send out a flow signal. The flow signal is compared with the reference flow signal in the voltage comparison circuit 18 after being amplified by the amplifier circuit 17. If the amplified flow signal is smaller than the reference flow signal, a comparison signal will be output to the trigger circuit 19. The trigger circuit 19 triggers the trigger signal to be sent to the controller 20. The controller 20 controls the relay 22 to work through the decoder 21, so that the relay 22 keeps the water pump 16 energized. At this time, the water pump 16 will suck the liquid with a gradually reduced flow rate in the outlet of the valve body 1, so as to ensure that the amount of liquid in the upper space is sufficient, and then the liquid can press the diaphragm 4, and then the diaphragm 4 drives the valve stem 7 and the valve core to move downward, so that the valve core can relatively firmly contact the inner wall of the valve body 1 to block the flow channel of the valve body 1 and avoid leakage.

[0029] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A diaphragm control valve, comprising a valve body (1), a valve cover (2) fixedly connected to the valve body (1), and a valve cap (3) fixedly connected to the valve cover (2), wherein a diaphragm (4) is fixedly connected between the valve cover (2) and the valve cap (3), and characterized in that: The valve cover (2) and the valve cap (3) are separated into an upper space and a lower space by a diaphragm (4); the lower space is connected to the feed port of the valve body (1) through a first water pipe (8); the upper space is connected to the discharge port of the valve body (1) through a second water pipe (11); a third water pipe (14) connected to the upper space is connected at the lowest level of the discharge port of the valve body (1); a flow sensor (15) and a water pump (16) are connected to the third water pipe (14); the flow sensor (15) controls the operation of the water pump (16) through a flow control circuit.

2. A diaphragm control valve according to claim 1, characterized in that: The flow control circuit comprises a voltage comparison circuit (18), a trigger circuit (19), a controller (20), a decoder (21), and a relay (22); the output end of the flow sensor (15) is coupled to the input end of the voltage comparison circuit (18); the output end of the voltage comparison circuit (18) is coupled to the input end of the trigger circuit (19); the output end of the trigger circuit (19) is coupled to the input end of the controller (20); the output end of the controller (20) is coupled to the input end of the decoder (21); the output end of the decoder (21) is coupled to the input end of the relay (22); and the relay (22) controls the on and off of power to the water pump (16).

3. A diaphragm control valve according to claim 2, characterized in that: The flow control circuit further comprises an amplifier circuit (17), wherein the amplifier circuit (17) is coupled between the flow sensor (15) and the voltage comparison circuit (18).

4. A diaphragm control valve according to claim 3, characterized in that: The amplifying circuit (17) is an operational amplifier, the voltage comparison circuit (18) is a voltage comparator, the trigger circuit (19) is an RS trigger, and the controller (20) is an STM32 single-chip microcomputer.

5. The diaphragm control valve according to claim 1, characterized in that: The first water pipe (8) is connected to a first solenoid valve (10) and a first filter (9).

6. A diaphragm control valve according to claim 1, characterized in that: The second water pipe (11) is connected to a second solenoid valve (13) and a second filter (12).

7. The diaphragm control valve according to claim 1, characterized in that: It also includes an upper clamping plate (5) and a lower clamping plate (6), wherein the upper clamping plate (5) and the lower clamping plate (6) are clamped on both sides of the diaphragm (4), and the upper clamping plate (5) and the lower clamping plate (6) are fixedly connected to a valve stem (7) that passes through the valve cover (2), and the lower end of the valve stem (7) is fixedly connected to a valve core.

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