JPH1096409A - Digitally controlled pressure reducing valve - Google Patents

Abstract

(57) [Summary] [Problem] A predetermined pressure setting operation can be performed very easily.
In addition, a digitally controlled pressure reducing valve which has high stability of a set pressure value, can easily and accurately read the set pressure value, and is compact, easy to carry, and excellent in mobility. A pressure reducing valve for adjusting a secondary pressure on an output side when an input primary pressure is output as a secondary pressure, wherein the pressure reducing valve always digitally displays a detected secondary pressure value. Pressure display unit, a pressure setting unit for inputting a target pressure setting value, and comparing the pressure setting value set by the pressure setting unit with the actually measured secondary pressure on the output side. A feedback control so that the difference is within an allowable deviation, a contra-roller for displaying a finally controlled secondary pressure value, and a voltage-based on a control output value output by the contra-roller. A voltage-pneumatic converter for performing pneumatic conversion, and a pressure sensor for actually measuring an output-side secondary pressure set by the voltage-pneumatic converter, are integrally provided in a housing. It is configured to be.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure reducing valve for adjusting a secondary pressure on an output side when an input primary pressure is output as a secondary pressure, and more particularly to a pressure setting section, a pressure display section,
A voltage-pneumatic converter, a pressure sensor, and a controller for feedback control are integrally formed in the housing,
The present invention relates to a digitally controlled pressure reducing valve capable of digitally displaying a feedback-controlled secondary pressure detection value.

[0002]

2. Description of the Related Art In recent years, FA (factory automation) has rapidly progressed, and accordingly, the amount of pneumatic equipment used has been increasing.

In using a pneumatic device, air from an air pressure source is compressed by a compressor. If the air itself has a pulsation or is considerably higher than the working pressure, it cannot be used as a pressure source as it is. Therefore, for example, when trying to move an air cylinder or an air rotor, it is necessary to prevent pulsation of the supplied compressed air and reduce the pressure to a required pressure. Furthermore, even if the pressure of the air pressure source changes, the depressurized air needs to be stable,
In addition, necessary flow rates must be ensured.

A pressure reducing valve is widely used as a pressure adjusting device for automatically adjusting the pressure in response to such a request.

[0005]

However, in the pressure adjusting operation of the conventionally used pressure reducing valve by the operator, the operator turns the adjusting knob while watching the pressure value indicated by the needle of the pressure gauge attached to the pressure reducing valve. A pressure setting must be made. For this reason, the operation of setting the target pressure is very complicated, and the set pressure value is difficult to see. In addition, higher pressure values have been required.

The present invention has been devised in view of such circumstances, and it is an object of the present invention to perform a predetermined pressure setting operation very easily and to ensure that the set pressure value is stable. An object of the present invention is to provide a digitally-controlled pressure reducing valve which is high and can easily and accurately read a set pressure value, and which is compact, easy to carry, and excellent in mobility.

[0007]

In order to solve the above-mentioned problems, the present invention provides a pressure reducing valve for adjusting an output-side secondary pressure when outputting an inputted primary pressure as a secondary pressure. The pressure reducing valve is set by a pressure display unit that can always digitally display a secondary pressure detection value, a pressure setting unit for inputting a target pressure set value, and the pressure setting unit. The pressure setting value is compared with the actually measured secondary pressure on the output side, feedback control is performed so that the difference is within the allowable deviation, and a contrast control for displaying the finally controlled secondary pressure value is performed. Roller, a voltage-pneumatic converter for performing voltage-pneumatic conversion based on the control output value output by the contra-roller, and a secondary on the output side set by the voltage-pneumatic converter. Pressure sensor that measures pressure is integrated Configured so as to have a housing.

The pressure setting section for inputting a target pressure set value has a pressure set button. The pressure set button is a set button for waiting for pressure setting and setting the set value, and a pressure set value. It is configured to have a pressure increase and decrease button for changing the pressure.

The pressure display unit capable of digitally displaying a pressure value is configured to display the pressure actually measured by the pressure sensor.

Also, two pressure display units capable of digitally displaying the pressure value are provided, one of the pressure display units displays the pressure set by the pressure setting unit, and the other pressure display unit includes a pressure sensor. May be configured to display the actually measured pressure.

[0011] The housing is configured to have a pipe connection port for inputting a primary pressure and outputting a secondary pressure.

The digitally controlled pressure-reducing valve of the present invention having such a configuration can perform a predetermined pressure setting operation very easily because it can be digitally displayed, and the set pressure value can be read easily and accurately. . Further, since the secondary pressure is output by performing the feedback control, a secondary pressure having high stability with respect to the set value can be easily obtained. Moreover,
Since the predetermined operating means are integrated in the housing, the pressure reducing valve itself is compact and easy to carry, and has excellent mobility.

[0013]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described in detail with reference to FIG. FIG. 1 is a block diagram of each operating means (operating device) incorporated in the digitally controlled pressure reducing valve of the present invention, and FIG. 2 is a flowchart showing the operation of the controller in FIG. FIG. 3 shows an example of an external perspective view of a digitally controlled pressure reducing valve of the present invention.

As shown in FIG. 1, a digitally controlled pressure reducing valve 1 of the present invention includes a pressure setting unit 3, a controller 5,
D / A (digital / analog) converter 9 and amplifier 12
, A voltage-pneumatic converter 15, a pressure sensor 18, an amplifier 12, an A / D (analog / digital) converter 24
And the pressure display unit 60 are integrated in the housing 70 (FIG. 3).

In the pressure setting section 3, a desired pressure set value is inputted by an operator. As shown in FIG. 3, the pressure setting unit 3 that specifically sets the pressure includes a pressure setting button 30, and the pressure setting button 30 is a set button 31 for waiting for pressure setting and determining the set value. And pressure increase and decrease buttons 35 and 36 for changing the pressure set value. Then, if the set button 31 is pressed once, the digital display indicating the secondary pressure detection value starts blinking, and a state of waiting for pressure setting is established. Next, the digital display is adjusted with the pressure increase / decrease buttons 35 and 36 so that the target pressure is attained.
Pressing to confirm the set value completes the setting of the pressure (the digital display value during this time is the detected value of the secondary pressure including the blinking time.
If the set button 31 is not pressed within a predetermined time after the pressure is changed at 5 or 36, the set value will not be determined and will automatically return to the previous set value.

The set value of the pressure set in this way is taken into a set value calculation storage unit 51 in the controller 5 (microcomputer CPU). On the other hand, the actual secondary pressure is detected by the pressure sensor 18, and the detected pressure value is amplified by the amplifier 21, and then converted from an analog signal to a digital signal by an A / D (analog / digital) converter 24. The converted signal value is compared with a target pressure value set in advance by a comparison unit 57 in the controller 5 (microcomputer CPU), and the difference between the two is greater than or equal to a predetermined allowable deviation. If so, the control output value is added or subtracted by one point. And the control unit calculation unit 5
The control output value calculated from 8 is converted from a digital signal to an analog signal by a D / A (digital / analog) converter 9, and the converted signal value is amplified by an amplifier 12 to obtain a control voltage. . This control voltage is applied to the voltage-pneumatic converter 15 and a predetermined secondary pressure is output. The obtained secondary pressure is detected by the pressure sensor 18, and the detected pressure value is amplified by the amplifier 21, and then converted from an analog signal to a digital signal by an A / D (analog / digital) converter 24. The converted signal value is taken into the controller 5 (microcomputer CPU). Then, the addition and subtraction of the output value are repeated until the difference between the preset set pressure value and the pressure detection value actually measured by the pressure sensor is within a predetermined allowable deviation. The detected pressure value is digitally displayed on the pressure display unit 60 via the display control unit 55. The digital display means that the pressure value is displayed as a numerical value having a finite number of digits.

The operation of the controller 5 having such a so-called feedback control function is shown in the flowchart of FIG. The allowable deviation d and the control output value of the initial setting (s1) are stored in the CPU in advance. An operation of capturing the pressure set value a (s2) is performed, and then an output of the control output value is performed (s3). Thereafter, an operation of capturing the actual pressure detection value b based on the output of the control output value (s2)
4) The operation (s5) of the display control of the detected pressure is performed, and then the operation (s6) of obtaining the difference c between the pressure set value a and the detected pressure value b is performed. Then, it is determined whether or not the absolute value of the difference c is within the range of the allowable deviation d (s7). If it is not within the range of the allowable deviation d, the control voltage output value is adjusted (s8). If it is within the range of the allowable deviation d, the control voltage output value is adjusted (S8). s
8) is not performed, and the next step, determination of the presence or absence of a pressure change command (s9), is performed. If the pressure needs to be changed again, the process returns to the step before the above-described operation of loading the pressure set value a (s2). If the pressure does not need to be changed, the display control operation of the detected pressure (s5) is performed.
The pressure value subjected to the feedback control is digitally displayed on the pressure display unit.

In the embodiment described above, one pressure display unit 60 capable of digitally displaying a pressure value is provided, and usually displays the detected secondary pressure at all times.
Not limited to this mode, for example, two pressure display units that can digitally display a pressure value are installed, and one of the pressure display units displays the pressure set in the pressure setting unit,
On the other pressure display section, the pressure actually measured by the pressure sensor may be displayed. In this case,
There is an advantage that the set pressure value and the actually measured pressure value can be visually observed simultaneously.

Further, the housing 70 for integration usually has a pipe connection port (for example, indicated by reference numeral 73) for inputting a primary pressure and outputting a secondary pressure, and a power cord 75. Have been.

In the present invention, the pressure setting unit 3 may be incorporated in the controller 5 so that pressure setting, pressure management, and the like can be remotely operated from an external personal computer (PC). In this case, a plurality of digitally controlled pressure reducing valves can be centrally controlled by a personal computer (PC).

The digital display method of the pressure display unit in the present invention can adopt various known methods such as a liquid crystal display, and is not particularly limited.

[0022]

According to the present invention, there is provided a pressure reducing valve for adjusting a secondary pressure on an output side when an input primary pressure is output as a secondary pressure, and the pressure reducing valve digitally displays a pressure value. A possible pressure display unit, a pressure setting unit for inputting a target pressure setting value, and comparing the pressure setting value set by the pressure setting unit with the actually measured secondary pressure on the output side, A feedback control is performed so that the difference is within a predetermined allowable deviation, a contra-roller for displaying a value of the secondary pressure that is constantly detected, and a voltage- A voltage-pneumatic converter for performing pneumatic conversion, and a pressure sensor for actually measuring an output-side secondary pressure set by the voltage-pneumatic converter, are integrally provided in a housing. Be composed.

Therefore, the digitally controlled pressure reducing valve of the present invention having such a configuration can perform a predetermined pressure setting operation very easily because it can be digitally displayed, and the set pressure value can be easily and accurately set. Can be read. Also, because the secondary pressure is output by applying feedback control,
A highly stable secondary pressure with respect to the set value can be easily obtained.
In addition, since the predetermined operating means are integrated in the housing, the pressure reducing valve itself is compact, easily portable, and excellent in mobility.

[Brief description of the drawings]

FIG. 1 shows a block diagram of each operating device incorporated in a digitally controlled pressure reducing valve of the present invention.

FIG. 2 is a flowchart showing the operation of the controller in FIG. 1;

FIG. 3 is an external perspective view of a digitally controlled pressure reducing valve of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Digital control type pressure reducing valve 3 ... Pressure setting part 5 ... Controller 9 ... D / A converter 12 ... Amplifier 15 ... Voltage-pneumatic converter 18 ... Pressure sensor 21 ... Amplifier 24 ... A / D converter 30 ... Pressure Setting button 60: Pressure display

Claims (5)

[Claims] 1. A pressure reducing valve for adjusting a secondary pressure on an output side when an input primary pressure is output as a secondary pressure, wherein the pressure reducing valve always digitally displays a detected secondary pressure value. A pressure display unit, a pressure setting unit for inputting a target pressure set value, and comparing the pressure set value set by the pressure set unit with the actually measured output-side secondary pressure. A feedback control so that the difference is within an allowable deviation, and a contra roller for displaying a finally controlled secondary pressure value, and a voltage based on a control output value output by the contra roller. A voltage-pneumatic converter for performing pneumatic conversion, and a pressure sensor for actually measuring an output-side secondary pressure set by the voltage-pneumatic converter, are integrally provided in the housing. Digitally controlled pressure reducing valve. 2. A pressure setting section for inputting a target pressure set value includes a pressure setting button, and the pressure setting button includes a set button for waiting for pressure setting and setting of a set value, and a pressure setting button. 2. The digitally controlled pressure reducing valve according to claim 1, further comprising a pressure increasing and decreasing button for changing a value. 3. The pressure display unit capable of digitally displaying the pressure value displays one of a pressure set by a pressure setting unit and a pressure actually measured by a pressure sensor. Digitally controlled pressure reducing valve. 4. A pressure display unit capable of digitally displaying the pressure value is provided with two pressure display units. One of the pressure display units displays the pressure set by the pressure setting unit, and the other pressure display unit displays the pressure. The digitally controlled pressure reducing valve according to claim 1 or 2, wherein a pressure actually measured by the sensor is displayed. 5. A pipe connection port for inputting a primary pressure and outputting a secondary pressure is formed in the housing.
A digitally controlled pressure reducing valve according to claim 4.