Method for flow control of a corrosive fluid and motorised regulating valve

Abstract

The application discloses a kind of flow control method of corrosive fluid and electric regulating valve, specifically relates to chemical automation technical field, including following method: S1, control end input flow demand data, control valve body flow passage opening size.S2, obtain the real-time change data of valve body liquid inlet port pressure, record the fluctuation data of liquid inlet port pressure change and send to the control end.S3, when the valve body liquid inlet port pressure transiently increases, carry out pressure relief, and store excess liquid.The application monitors liquid flow and pressure by using liquid inlet sensor, controls air pump through control end according to pressure change, controls liquid pressure for pump body liquid inlet port, and then keeps sealing block to move to appropriate position to keep corresponding flow opening size, can keep pressure by this way, keeps the constant of flow under the same pressure of the same flow channel size, reduces the dependence on upstream raw material supply stability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical engineering automation, and more particularly to a flow control method for corrosive fluid and an electric regulating valve. BACKGROUND

[0002] As one of the high-risk raw materials in chemical production, the fluid with corrosion characteristics is processed with perfect production equipment and system for stable allocation of corrosive fluid in the process. With the continuous advancement of automatic production, the supply of corrosive fluid is also more intelligent and automatic. However, during the allocation process of the corrosive fluid, due to the upstream equipment raw material supply, such as switching of different corrosive raw materials, and even mixing of multiple solvents, the constant flow of the continuous delivery stability is affected, which easily causes deviation of part of the product allocation solution, and cannot meet the increasing needs of precise production. Therefore, the present application is proposed to solve the above-mentioned problems in the current state. SUMMARY

[0003] In order to overcome the above-mentioned defects of the prior art, the present application provides a flow control method for corrosive fluid and an electric regulating valve, and the technical problems to be solved by the present application are: to solve the problem that the flow is easily changed during the automatic supply process of the dangerous solution in chemical production, which is not conducive to production.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a flow control method for corrosive fluid, comprising the following methods:

[0005] S1, input flow demand data to the control end, and control the opening size of the valve body flow passage.

[0006] S2, acquire real-time change data of the valve body liquid inlet port pressure, and record the fluctuation data of the liquid inlet port pressure change and send it to the control end.

[0007] S3, when the valve body liquid inlet port pressure is instantaneously increased, relieve the pressure and store the excess liquid.

[0008] S4, monitor the flow data of the valve body liquid outlet port, and send the flow data to the control end in real time.

[0009] S5, when the flow of the valve body liquid outlet port is reduced, return the stored liquid to compensate the pressure and maintain the flow.

[0010] As a further scheme of the present application: the control end collects the liquid inlet port and liquid outlet port information through a local area network.

[0011] As a further solution of the present invention: the valve body includes a shell, a connecting port is installed on the upper surface of the shell, a bracket is fixedly connected to the upper surface of the connecting port, a protective shell is fixedly connected to the upper surface of the bracket, a reducer driven by a motor is fixedly installed on one side of the bracket, a connecting rod is sliding through the opposite surfaces of the protective shell and the connecting port, the output shaft of the reducer is fixedly connected to a deflection rod, a sliding hole is opened through the surface of the deflection rod, a connecting piece is fixedly passed through the surface of the connecting rod, a pressure plate is fixedly connected to the surface of the connecting piece, a pin is provided on the surface of the pressure plate and slides with the sliding hole, and the bottom end of the connecting rod is fixedly connected to a sealing block for sealing the shell.

[0012] As a further solution of the present invention: a sealing seat is fixed on the upper surface of the connecting port, a sealing member is sealed and fixed to the inner wall of the sealing seat, the top end of the connecting rod is fixedly connected to a piston that slides on the inner wall of the protective shell, the upper surface of the piston is fixedly connected to a spring, and the inner wall of the protective shell is fixedly connected to a support seat for supporting the top end of the spring.

[0013] As a further solution of the present invention: the lower surface of the shell is connected to a storage tank, the inner wall of the storage tank is sealed and slidably provided with an isolation slide, the bottom of the storage tank is provided with an air nozzle for connecting to an air pump, a liquid inlet sensor is provided through the upper left side of the shell, and a liquid outlet sensor is provided through the lower right side of the shell.

[0014] As a further solution of the present invention: a positioning strip is welded on the surface of the bracket, a positioning hole for sliding with the positioning strip is opened on the surface of the connecting piece, and a sheath for protecting the connecting rod is fixed to the opposite surfaces of the connecting piece and the protective shell.

[0015] As a further solution of the present invention: the pressure relief process includes the following steps:

[0016] a. The liquid inlet sensor at the valve body's liquid inlet port detects a pressure increase. The controller receives the pressure increase value and controls the air pump to extract the gas from the storage tank.

[0017] b. When the air pressure in the tank changes, the isolation slide slides through the tank to draw an appropriate amount of liquid into the liquid inlet port at the liquid inlet sensor position. At this time, the flow rate through the sealing block is constant and the flow rate does not change.

[0018] As a further solution of the present invention: the pressure compensation comprises the following steps:

[0019] c. The liquid inlet sensor at the liquid inlet port of the valve body detects a pressure drop, and the controller receives the pressure drop data and controls the air pump to pump gas into the storage tank.

[0020] d. The air pressure in the tank increases, and the isolation slide squeezes part of the liquid in the tank to the liquid inlet port. At this time, the pressure remains constant and the flow rate does not change.

[0021] As a further scheme of the present application: after the pressure relief and pressure compensation, the flow control further comprises:

[0022] e. The liquid outlet sensor detects the flow of the valve body liquid outlet port. If the flow is high, the control driver and reducer drive the sealing block to move. The opening of the flow channel in the shell is reduced and an alarm is given.

[0023] f. If the flow is low, the control driver and reducer drive the sealing block to move, and the flow channel in the shell is increased and an alarm is given.

[0024] The present application has the following advantages:

[0025] 1. The present application uses a liquid inlet sensor to monitor the liquid flow and pressure. According to the change of pressure, the control end controls the air pump to control the liquid pressure at the liquid inlet port of the pump body, and then keeps the sealing block moving to the appropriate position to maintain the opening size corresponding to the flow. This way can keep the flow constant under the same pressure and flow channel size, reducing the dependence on the stability of upstream raw material supply.

[0026] 2. The present application uses a liquid outlet sensor to monitor the liquid outlet flow. If the liquid outlet flow changes, the pressure compensation and pressure relief at the liquid inlet port position cannot be maintained, indicating that the solution supply pressure is continuously decreasing or continuously increasing. At this time, the sealing block is adjusted to change the opening size of the flow channel, and the flow is adjusted and maintained in an emergency. Real-time flow changes are adjusted in real time, and an alarm is given to check the upstream raw material supply status in time to ensure stable production. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a schematic diagram of the control system of the present application;

[0028] Figure 2 is a schematic diagram of the valve body of the present application;

[0029] Figure 3 is a schematic diagram of the cross section of the protective shell of the present application;

[0030] Figure 4 is a schematic diagram of the cross section of the storage tank of the present application;

[0031] Figure 5 is a schematic diagram of the connection of the present application.

[0032] In the figure: 1, the shell; 2, the tank; 3, the connecting port; 4, the sealing element; 5, the support; 6, the sheath; 7, the speed reducer; 8, the deflection rod; 9, the pressing plate; 10, the sliding hole; 11, the connecting piece; 12, the positioning hole; 13, the positioning strip; 14, the connecting rod; 15, the sealing seat; 16, the sheath; 17, the piston; 18, the spring; 19, the support seat; 20, the liquid inlet sensor; 21, the liquid outlet sensor; 22, the sealing block; 23, the isolation sliding piece; 24, the air nozzle. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0034] Embodiment 1

[0035] A flow control method of a corrosive fluid, comprising the following steps:

[0036] S1, inputting flow demand data to a control end, and controlling the opening size of a flow channel of a valve body.

[0037] S2, acquiring real-time change data of the pressure at a liquid inlet port of the valve body, and sending the fluctuation data of the pressure at the liquid inlet port to the control end.

[0038] S3, when the pressure at the liquid inlet port of the valve body instantaneously increases, performing pressure relief, and storing the excess liquid.

[0039] S4, monitoring the flow data at a liquid outlet port of the valve body, and sending the flow data to the control end in real time.

[0040] S5, when the flow at the liquid outlet port of the valve body decreases, returning the stored liquid to perform pressure compensation, and maintaining the flow.

[0041] The control end collects information through a local area network from the liquid inlet port and the liquid outlet port.

[0042] By using liquid inlet sensor 20 to monitor the liquid flow and pressure, according to the change of pressure by controlling the end control air pump, make it for the pump body liquid inlet port for liquid pressure control, and then keep the block 22 to move to the appropriate position to keep the corresponding flow opening size, can be kept by this way, under the same pressure of the same flow channel size, keep the flow constant, reduce the dependence on the stability of the upstream raw material supply, at the same time, the liquid outlet sensor 21 monitors the liquid outlet flow, if the liquid outlet flow changes, the pressure compensation and pressure relief of the liquid inlet port position cannot be maintained, indicating that the solution supply pressure continues to decrease or continuously increase, at this time, adjust the block 22, change the opening size of the flow channel, adjust and keep the flow, adjust in real time through real-time flow change, and alarm in time, check the upstream raw material supply state in time, and ensure the stable production.

[0043] The key equipment used in the above-mentioned corrosion fluid flow control method is the valve body mentioned above, which is an electrically adjusted valve and specifically includes the following structural features:

[0044] The valve body includes a shell 1, a connecting port 3 is installed on the upper surface of the shell 1, a support 5 is fixedly connected to the upper surface of the connecting port 3, a protective shell 6 is fixedly connected to the upper surface of the support 5, a reducer 7 driven by an electric motor is fixedly installed on one side of the support 5, a connecting rod 14 is slidably penetrated through the opposite surfaces of the protective shell 6 and the connecting port 3, a deflection rod 8 is fixedly connected to the output shaft of the reducer 7, a sliding hole 10 is formed through the surface of the deflection rod 8, a connecting piece 11 is fixedly connected to the surface of the connecting rod 14, a pressure plate 9 is fixedly connected to the surface of the connecting piece 11, a pin shaft for sliding cooperation with the sliding hole 10 is arranged on the surface of the pressure plate 9, and an sealing block 22 for sealing the shell 1 is fixedly connected to the bottom end of the connecting rod 14. An sealing seat 15 is fixedly connected to the upper surface of the connecting port 3, a sealing piece 4 is sealingly fixed to the inner wall of the sealing seat 15, a piston 17 slidably arranged in the inner wall of the protective shell 6 is fixedly connected to the top end of the connecting rod 14, a spring 18 is fixedly connected to the upper surface of the piston 17, and a support seat 19 for supporting the top end of the spring 18 is fixedly connected to the inner wall of the protective shell 6. A storage tank 2 is communicated with the lower surface of the shell 1, an isolation sliding piece 23 is sealingly and slidably arranged in the inner wall of the storage tank 2, an air nozzle 24 for communicating with an air pump is arranged on the bottom of the storage tank 2, a liquid inlet sensor 20 is penetrated through the upper left side of the shell 1, and a liquid outlet sensor 21 is penetrated through the lower right side of the shell 1. A positioning strip 13 is welded to the surface of the support 5, a positioning hole 12 for sliding cooperation with the positioning strip 13 is formed in the surface of the connecting piece 11, and a protective sleeve 16 for protecting the connecting rod 14 is fixedly arranged on the opposite surfaces of the connecting piece 11 and the protective shell 6.

[0045] The above structural features include the following operating mechanism:

[0046] Regarding the height change of the sealing block 22 and the control of the opening size of the flow channel;

[0047] In use, the control end increases the output torque by controlling the driver to cooperate with the speed reducer 7, so that the deflection rod 8 starts to deflect under the action of the output shaft of the speed reducer 7, and the deflection rod 8 cooperates with the pin shaft on the surface of the pressing plate 9 through the sliding hole 10 on the surface, so that the pressing plate 9 drives the connecting piece 11 to move up and down, and the connecting piece 11 moves stably through the cooperation of the positioning hole 12 and the positioning bar 13.

[0048] At the same time of the height change of the connecting piece 11, the height change of the pull rod is driven synchronously, so that the pull rod drives the sealing block 22 to move, so that the opening size of the flow passage inside the shell 1 changes, that is, the flow rate can be controlled.

[0049] At the same time of the movement of the pull rod, the piston 17 is driven, so that the piston 17 drives the spring 18 to contract and change, and the spring 18 is supported on the support seat 19. When the driver is closed, the spring 18 drives the piston 17 to reset, and the pull rod and the sealing block 22 can be in a closed state.

[0050] Regarding the pressure stability and the guarantee of constant flow rate, the following structure is included. The control end controls the air pump, so that the air pump can pump out and pump in the gas inside the storage tank 2, the isolation sliding piece 23 moves up and down under the control of the air pressure of the air pump, the pumping in and pumping out of the solution is performed, and the control end performs real-time dynamic adjustment of the air pump according to the pressure data detected by the liquid inlet sensor 20 of the liquid inlet port.

[0051] The three states of overall control include pressure relief, compensation and emergency flow control, and the three states correspond to three response modes under different use conditions, as follows:

[0052] 1. The pressure relief process includes the following steps:

[0053] a. The liquid inlet sensor 20 of the valve body detects that the pressure increases, the controller receives the pressure increase value and controls the air pump to pump out the gas in the storage tank 2.

[0054] b. The gas pressure in the storage tank 2 changes, the isolation sliding piece 23 slides through the storage tank 2 to pump the liquid in the liquid inlet port at the position of the liquid inlet sensor 20 into an appropriate amount, at this time the flow rate through the sealing block 22 is constant and the flow rate does not change.

[0055] 2. The pressure compensation includes the following steps:

[0056] c. The liquid inlet sensor 20 of the valve body detects that the pressure decreases, the controller receives the decrease data and controls the air pump to pump gas into the storage tank 2.

[0057] d. The gas pressure in the storage tank 2 increases, the isolation sliding piece 23 extrudes part of the liquid in the storage tank 2 to the liquid inlet port, at this time the pressure remains constant and the flow rate does not change.

[0058] 3When the pressure relief and pressure compensation are ineffective, the emergency flow control further includes:

[0059] e. The liquid outlet sensor 21 detects the flow of the valve body liquid outlet port. If the flow is high, the control driver and reducer 7 drive the sealing block 22 to move. The opening of the flow channel in the shell 1 is reduced and an alarm is given.

[0060] f. If the flow is low, the control driver and reducer 7 drive the sealing block 22 to move, and the flow channel in the shell 1 is increased and an alarm is given.

[0061] Finally, it should be pointed out that although the above has been described in detail by general description and specific embodiments, the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited to the above; although the above has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or part or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric regulating valve, comprising a valve body, characterized in that: The valve body comprises a shell (1), a connection port (3) is installed on the upper surface of the shell (1), a bracket (5) is fixedly connected to the upper surface of the connection port (3), a protective shell (6) is fixedly connected to the upper surface of the bracket (5), a reducer (7) is fixedly installed on one side of the bracket (5), the control end increases the output torque by controlling the driver to cooperate with the reducer (7), the protective shell (6) and the opposite surface of the connection port (3) are penetrated by a connecting rod (14), the output shaft of the reducer (7) is fixedly connected to a deflection rod (8), a sliding hole (10) is penetrated through the surface of the deflection rod (8), a connecting piece (11) is fixedly penetrated through the surface of the connecting rod (14), a pressure plate (9) is fixedly connected to the surface of the connecting piece (11), a pin shaft is provided on the surface of the pressure plate (9) for sliding with the sliding hole (10), and a sealing block (22) for sealing the shell (1) is fixedly connected to the bottom end of the connecting rod (14); A sealing seat (15) is fixed to the upper surface of the connecting port (3), a sealing member (4) is sealed and fixed to the inner wall of the sealing seat (15), a piston (17) sliding on the inner wall of the protective shell (6) is fixedly connected to the top of the connecting rod (14), a spring (18) is fixedly connected to the upper surface of the piston (17), and a support seat (19) for supporting the top of the spring (18) is fixedly connected to the inner wall of the protective shell (6); The lower surface of the housing (1) is connected to a storage tank (2), an isolation slide (23) is provided on the inner wall of the storage tank (2) for sealing and sliding, an air nozzle (24) for connecting to an air pump is provided at the bottom of the storage tank (2), a liquid inlet sensor (20) is provided through the upper portion of the left side of the housing (1), and a liquid outlet sensor (21) is provided through the lower portion of the right side of the housing (1); A positioning strip (13) is welded to the surface of the bracket (5), a positioning hole (12) for slidingly cooperating with the positioning strip (13) is opened on the surface of the connecting member (11), and a sheath (16) for protecting the connecting rod (14) is fixed to the opposite surface of the connecting member (11) and the protective shell (6).

2. A method for controlling the flow of corrosive fluids, using the electric regulating valve according to claim 1, characterized in that: This includes the following methods: S1, the control end inputs the flow demand data to control the size of the valve body flow channel opening; S2. Acquire real-time pressure change data of the liquid inlet port of the valve body, record the pressure change data of the liquid inlet port and send it to the control end; S3, when the pressure at the liquid inlet port of the valve body increases instantaneously, the pressure is released to store the excess liquid; S4, monitoring the flow data of the valve body outlet port and sending the flow data to the control end in real time; S5. When the flow rate at the valve body's liquid outlet port decreases, the stored liquid is refluxed for pressure compensation to maintain the flow rate.

3. The method for controlling the flow rate of a corrosive fluid according to claim 2, wherein: The control terminal collects information of the liquid inlet port and the liquid outlet port through the local area network.

4. A method for controlling the flow rate of a corrosive fluid according to claim 2 or claim 3, characterized in that: The pressure relief process includes the following steps: a. The liquid inlet sensor (20) at the liquid inlet port of the valve body detects a pressure increase, and the controller receives the pressure increase value and controls the air pump to extract the gas from the storage tank (2); b. When the air pressure in the storage tank (2) changes, the isolation slide (23) slides through the storage tank (2) to draw an appropriate amount of liquid into the liquid inlet port at the position of the liquid inlet sensor (20). At this time, the flow rate through the sealing block (22) is constant and the flow rate does not change.

5. A method for controlling the flow rate of a corrosive fluid according to claim 2 or claim 3, characterized in that: The pressure compensation comprises the following steps: c. The liquid inlet sensor (20) of the liquid inlet port of the valve body detects a pressure drop, and the controller receives the pressure drop data and controls the air pump to pump gas into the storage tank (2); d. The air pressure in the storage tank (2) increases, and the isolation slide (23) squeezes part of the liquid in the storage tank (2) to the liquid inlet port. At this time, the pressure remains constant and the flow rate does not change.

6. A method for controlling the flow rate of a corrosive fluid according to claim 2 or claim 3, characterized in that: After the pressure relief and pressure compensation, the flow control also includes: e. The liquid outlet sensor (21) detects the flow rate of the liquid outlet port of the valve body. If the flow rate is high, the driver and reducer (7) are controlled to drive the sealing block (22) to move; the opening of the flow channel in the housing (1) is reduced and an alarm is sounded; f. If the flow rate is low, the control driver and reducer (7) drive the seal (22) to move, the flow channel in the housing (1) increases and an alarm is sounded.

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