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Pneumatic pressure regulator

A regulator and comparator technology, applied in the direction of electric fluid pressure control, etc., can solve problems such as deterioration of stability, and achieve the effect of maintaining rapidity

Inactive Publication Date: 2004-08-25
SMC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the present inventors have found that, in the case where the electromagnetic coil is driven by the pulse width modulation signal, the electromagnetic coil is driven for a constant period, so that in the case where the discharge pressure value is close to a predetermined value (target value), exceeding The amount of the predetermined pressure value becomes larger, so the stability around the predetermined pressure value deteriorates

Method used

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Embodiment Construction

[0021] An embodiment of the present invention is described below with reference to the accompanying drawings.

[0022] FIG. 1 shows the mechanical configuration of a pneumatic regulator 10 to which an embodiment of the present invention is applied. figure 2 The circuit configuration of such a pneumatic regulator is shown.

[0023] In FIGS. 1 and 2, this pneumatic regulator 10 includes a main valve 11 for performing pressure control of a pneumatic device (not shown) and a bonnet 12 integrally engaged with and covering the main valve 11 .

[0024] In the main valve 11, an air inlet 13 (also referred to as air inlet) connected to a compressed air source (not shown) and an air outlet 14 connected to pneumatic equipment (not shown) are formed.

[0025] In a channel 15 that is connected with the air inlet 13 and the air outlet 14, an air supply valve body 17 that opens or closes an air supply opening 16 is provided, and the air supply valve body 17 is constantly compressed by a spr...

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Abstract

A discharge pressure value is smoothly brought close to a set pressure value, and fluctuation of the discharge pressure value reaching the set pressure value is reduced. When a difference C between the discharge pressure value P (B) of a pneumatic pressure regulator and a set pressure value A is relatively great, a solenoid valve is driven by a pulse width modulation signal D. Therefore, a high-speed input / output response (change characteristics of a pressure detection signal B with respect to a set pressure signal A) is retained. When the discharge pressure value P is close to the set pressure value Q, the solenoid valve is driven by a pulse frequency modulation signal J. Therefore, an excessive change quantity, that is, so-called "over-shoot", becomes small, and the change of the discharge pressure value P reaching the set pressure value Q, that is, so-called "ripple", can be eliminated.

Description

technical field [0001] The invention relates to a pneumatic regulator. Background technique [0002] The prior art of a pneumatic regulator for supplying constant pressure to pneumatic equipment is disclosed in, for example, Japanese Patent Laid-Open No. 7-50418. [0003] This pneumatic regulator is a device that detects the discharge pressure when adjusting the discharge pressure discharged from the main valve, compares the detected discharge pressure with a predetermined pressure, and adjusts according to the comparison result. The pulse width of the pneumatic pressure pulse supplied from a solenoid valve to a diaphragm cavity (pilot cavity), then increases or decreases the pilot pressure according to the pulse width of the pneumatic pulse supplied from the solenoid valve, and a diaphragm cavity connected to The air supply valve body is opened or closed to adjust the discharge pressure from the main valve to a predetermined pressure. [0004] In the above-mentioned pneum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D16/20
Inventor 上原照雄山田拓治猪原彻小熊和行
Owner SMC CORP