JPS63181012A - Flow rate control valve - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Applications The present invention relates to a flow control valve of the type that includes a housing having a bore and a piston cooperating with the bore. The flow rate can be measured using, for example, a diaphragm or a shutter. However, diaphragms and shutters are used to a very limited extent and require additional structural features.

[Summary of the invention]

One of the objects of the present invention is to provide an improved flow control valve.

In the valve according to the invention, the opening cross section of the valve itself is used as a shutter and the position of the valve piston relative to the valve bore or valve seat can be changed.

The invention is based on the assumption that a predetermined position of the piston, at which the desired flow rate is adjusted, is given for each valve pressure and is subject to each pressure deviation.

In this invention, it is proposed that the position of the valve piston in relation to the valve seat, for example the bore, is determined by the given flow rate and is also made to correspond to the pressure deviation set in the valve.

Aspects of the invention are achieved by a valve for controlling the amount of fluid, which includes an inlet, an outlet, a means for regulating the valve bore and a piston cooperating therewith, and a valve connected to the inlet for measuring the fluid pressure within the inlet. 1st
a pressure sensor, a second pressure sensor coupled to the outlet for measuring fluid pressure in the outlet, a measurement receiver for measuring the position of the piston relative to the bore, for a given fluid flow rate and each pressure deviation in the valve; The first and second pressure sensors and the measured value receiver are connected to the microcomputer, and the actual value of the piston position is stored in the memory. It is compared with the desired value stored in the data.

The valve may include at least one temperature sensor connected to at least the inlet and outlet of the valve to measure the temperature therein.

The valve may include a media correction controller device connected to a memory for correcting said quantities in the microcomputer depending on the viscosities of the various fluids passing through it.

The object of the invention is also achieved by a method for controlling a valve for the control of flow comprising a bore and means for regulating a piston cooperating with the bore, the method comprising pressure sensors at the inlet and outlet of the valve. , a memory is provided to a microcomputer, a pressure sensor is connected to the microcomputer, the fluid pressure is measured by the above sensors at the inlet and outlet to form a pressure deviation, the actual position of the piston is determined, and the microcomputer is connected to a pressure sensor. The desired value of the fluid volume, the pressure difference and the actual value of the position of the piston are input into the computer, and in this memory the values of the piston position are stored in order to preset the flow rate and the various pressure deviations. It consists of comparing the input values into the computer with the stored values in memory and, if the actual values differ from the desired values, sending an adjustment signal to the valve to change the position of the piston.

This method further includes measuring the actual temperature of the inlet and outlet fluids, inputting this temperature value into the microcopiator, and storing the desired temperature value in the memory. It may also consist of sending a temperature correction signal to the microcopiator that overlaps the position adjustment signal if the temperature value differs from the temperature value of

The method also includes the step of providing a media correction controller connected to the memory for providing a correction signal to the microcomputer that is dependent on the viscosity of the different fluids that can pass through the valve and in which the position adjustment signal changes. It's okay to stay.

The position of the valve piston associated with the valve bore and the cross-section of the bore can be varied, for example by a magnet, a step motor or manually, but each position of the valve piston can be detected by a suitable sensor, e.g. In the case of slide valves, the rotation angle receiver,
Or, in the case of seated or piston valves, it is measured by a relay receiver.

Here, the meaning of valve bore is the cross-section of the flow through a given valve in construction.

The features of the invention and its novel nature are pointed out with particularity in the appended claims. The invention itself, both in structure and method, is best understood from the following description of specific embodiments, taken in conjunction with the drawings, together with additional objects and advantages.

〔Example〕

As mentioned above, a predetermined valve position to which the desired amount Q is adjusted is provided for each pressure deviation ΔP. The operating graph for each valve position is shown in FIG.

The corresponding piston position is determined from the operating graph depending on the desired flow rate and the respective pressure deviation ΔP in the valve. If the motion graph is stored in an electrical memory, the measured data is compared with the stored data and, if deviations are apparent from the stored data, an adjustment signal to the piston is sent. is given, resulting in the required piston position and desired flow rate Q corresponding to each pressure deviation ΔP.

The relative relationship between medium temperature and viscosity can be determined in any conventional manner and the valve can be stored in an electrical memory.

In FIG. 2, reference numeral 10 indicates a valve, and FIG. 2 shows a circuit for controlling the valve 10. In FIG.

The valve 10 shown only diagrammatically can be a rotary slide valve, a seat-type valve or a piston valve. Pressure medium is supplied to the valve 10 through a conduit 12 and is conveyed from the valve 10 through a discharge conduit 14 to the point of consumption. Valve 10 is provided with suitable activation means,
For example, it may be controlled by a magnetically actuated pilot control valve 16, which can adjust the valve seat or the piston position relative to the valve seat. The valve 10 further includes a measurement value receiver, e.g.
8, the receiver of which checks the current position of the piston.

Pressure sensor 22 and temperature sensor 24 are connected to conduit 12 , while pressure sensor 26 and temperature sensor 28 are connected to discharge conduit 14 .

The circuit 20 includes a multiplexer 30, an analog-to-digital converter 32. Microcomputer 34, D/A converter 3
6. It consists of a voltage/current transmitter 38, a memory 40 and a media correction controller 42.

This circuit controls valve 10 in the following manner. The desired fluid volume is stored in the multiplexer 30, eg, the flow rate is determined in liters per unit time.

Additionally, pressure sensors 22 .upstream and downstream of valve 1O.
26 and temperature sensors 24, 2B are connected to the electrical circuit 4.
8 to multiplexer 30.

A signal representing the adjustment value of each of the pistons of valve 10 is sent from the measurement receiver through electrical path 50 to multiplexer 30 . The signals from these multiplexers 30 are processed through D/A converters or sent directly to the microcomputer 34 through control lines 52. These signals are evaluated in microcomputer 34 and compared with values stored in memory 40. In the memory 40, the pressure deviation ΔP, temperature and viscosity on the one hand, and the opening cross section of the valve or the piston position on the other hand, are prestored.

According to the given control value indicating the desired flow rate, the microcomputer 34 compares the measured value with the stored value in the memory 40 and determines the required degree of opening of the valve opening while taking into account the pressure deviation occurring within the valve. Or determine the required position of the piston.

The regulation signal at each stage is then generated in the microcomputer 34, which signal is transmitted via a D/A converter 36 to a voltage /'[current transmitter 3
Sent to 8th. The output signal of transmitter 38 is sent to control valve 16 via control path 46 . Owing to that signal, the position of the piston of the valve is adjusted by movement, or rotation in the case of a rotary slide valve, so that the opening cross-section of the valve reaches the desired size.

The medium on which the valve 10 acts is the medium correction controller 4
2 can be adjusted.

The controller 42 sends a correction signal to a memory 40 connected to the controller. Along with this correction signal,
The viscosities of different media are taken into account.

The flow rate of the medium through the valve 10 is displayed on a flow indicator 44 connected to the microcomputer 34.

(Effects) In this way, it is possible to preset the desired fluid volume and maintain a predetermined flow rate on the discharge side of the valve, independent of variable factors such as pressure changes, temperature and viscosity at the outlet of the valve. becomes.

When various products are used for individual devices,
This is not possible because the memory capacity with correction values corresponds to each individual valve, or the memory corresponds to each valve taking into account the individual values and tolerances of the valve. This is because they are doing so.

The present invention cannot be applied only to valves whose piston position or valve opening cross section is always open; however, the present invention can be used to valves that simply open and close. In the case of such valves, instead of changing the valve opening cross-section, the valve opens and closes more or less frequently and/or more or less slowly per unit time.

Each of the elements described above can be effectively applied to a type of flow control valve other than the flow control valve shown above.

Although the present invention has been illustrated and described as embodied in a fluid flow control valve, it is not intended to be limited to the details shown, and may be susceptible to various modifications and constructions without departing from the spirit of the invention in any way. Modifications of the above may be made.

Without further analysis, the foregoing fully discloses the subject matter of the present invention and, by application of technical knowledge in the art, it is possible to obtain a general or specific summary of the present invention from the prior art. Various applications can easily be made by others without excluding the characteristics that completely constitute the woody character.

[Brief explanation of the drawing]

FIG. 1 is a graph showing the dependence between piston position and flow rate at different pressure differences. FIG. 2 is a flowchart of a fluid valve and the circuitry that controls the valve. 10... Valve 12... Feed path 14... Discharge path 16... Control valve 18...
Receiver 20...Circuit 22.26...Pressure sensor 24.28...Temperature sensor 30-...Multiplexer 32...Analog-digital converter 34...Microcomputer 36...D/A converter 38... Transmitter 40... Memory 42... Correction controller FIG, 1 Flow rate [1/+ain]

Claims (1)

[Claims] 1) means for regulating an inlet, an outlet, a valve bore and a piston cooperating with this bore, a first valve connected to the inlet for measuring the pressure of the medium in said inlet;
a pressure sensor, a second pressure sensor connected to the outlet for measuring medium pressure in the outlet, a measurement receiver for detecting a piston position relative to the bore;
The first and second pressure sensors and the measured value receiver are connected to the microcomputer, and the first and second pressure sensors and the measured value receiver are connected to the microcomputer. A flow control valve, characterized in that the actual value of the piston position is compared with a desired value stored in memory, and a piston position adjustment signal is sent from the microcomputer to the valve. 2) The flow control valve of claim 1 having at least one temperature sensor connected to at least the inlet and outlet of the valve for measuring temperature. 3) A flow control valve according to claim 1, including a medium correction controller connected to a memory for correcting the fluid volume value by a microcomputer depending on the viscosity of the various mediums passing through the valve. 4) Add pressure sensors to the inlet and outlet of the valve, equip the microcomputer with memory,
Furthermore, the pressure sensor is connected to a microcomputer,
Measuring the medium pressure by the inlet and outlet sensors to form the pressure deviation, regulating the actual value of the piston position, and inputting the desired values of the fluid volume, pressure deviation and actual value of the piston position into the microcomputer. The memory stores each value of the piston position for a preset flow rate and various pressure deviations, the values entered into the microcomputer are compared with the values in the memory, and the actual value is determined as desired. A method for controlling a flow control valve including a bore and a piston cooperating with the bore, characterized in that the method comprises a method for sending a piston position adjustment signal to the valve to change the position of the piston if the value differs from the value. 5) Measure the actual value of the inlet and outlet fluid temperature, enter this value into the microcomputer, the memory stores the desired temperature value, and if the actual value differs from the desired temperature value, the piston adjustment signal is overloaded. 5. A method of controlling a flow rate control valve according to claim 4, comprising the steps of sending a wrapping temperature correction signal to a microcomputer. 6) The flow control valve of claim 5, further comprising the step of: 6) providing a media correction controller connected to said memory for providing in said computer a correction signal responsive to the viscosity of the different media passing through the valve. Control method.