JPH05233072A - Electropneumatic regulator for vacuum - Google Patents

Abstract

PURPOSE:To improve control accuracy by decreasing the flow rate of sucking, eliminating the waste of air and controlling secondorder side negative pressure at the low degree of vacuum as well at the electropneumatic regulator for vacuum. CONSTITUTION:This electropneumatic regulator for vacuum adjusts the suction of air in a negative pressure port 1 and the supply of air to the negative pressure port 1 and controls second-order side negative pressure. Then, this regulator is provided with a main body 2 of the regulator, pressure sensor 7, two-way valve 5 for sucking air and two-way valve 6 for supplying air. Time for electrifying the two-way valves 5 and 6 for sucking and supplying air is adjusted corresponding to the differential voltage of the second-order side negative pressure detected by this pressure sensor 7 and set negative pressure shown by input signals from the outside, and the second-order side negative pressure is controlled to the set negative pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum electropneumatic regulator, and more particularly to a technique effectively applied to control a secondary side negative pressure.

[0002]

2. Description of the Related Art As a vacuum electropneumatic regulator of this type, for example, there is a nozzle flapper type vacuum electropneumatic regulator.

That is, this nozzle flapper type electro-pneumatic regulator for vacuum is provided with a T-shaped negative pressure passage, and an orifice, a negative pressure port and a nozzle are formed at the ends of this negative pressure passage, respectively, and opposed to this nozzle. The flapper is displaced by a solenoid or a piezoelectric element, and the secondary side negative pressure in the negative pressure port is controlled according to the displacement of the flapper.

[0004]

However, in the structure of the nozzle flapper type vacuum electro-pneumatic regulator described above, the secondary side negative pressure in the negative pressure port depends on the leak flow rate of the atmosphere from the nozzle corresponding to the displacement of the flapper. Since the structure controls the pressure, there is a problem that the intake flow rate increases and air is wasted.

An object of the present invention is to provide a vacuum electropneumatic regulator which can reduce the intake flow rate and eliminate the waste of air.

Another object of the present invention is to provide a vacuum electropneumatic regulator capable of controlling the secondary side negative pressure having a low degree of vacuum.

Another object of the present invention is to provide a vacuum electropneumatic regulator which can improve control accuracy.

The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

[0009]

Among the inventions disclosed in the present application, a brief description will be given to the outline of typical ones.
It is as follows.

That is, the vacuum electropneumatic regulator of the present invention has a structure for controlling the secondary side negative pressure by adjusting the intake of air in the negative pressure port and the supply of air to the negative pressure port.

In this case, a regulator main body having a negative pressure port, a pressure sensor for detecting a secondary side negative pressure in the negative pressure port, and an intake two-way valve for sucking air in the negative pressure port, A two-way valve for air supply for supplying the negative pressure port with atmospheric air, and the intake air according to a differential pressure between a secondary negative pressure detected by the pressure sensor and a set negative pressure indicated by an input signal from the outside. This is a structure in which the energization time to the two-way valve for supply and air supply is adjusted to control the secondary side negative pressure to a set negative pressure.

[0012]

According to the vacuum electropneumatic regulator having the above structure,
Since the structure in which the secondary side negative pressure is controlled by adjusting the intake of air in the negative pressure port and the supply of air to the negative pressure port, the intake flow rate can be reduced and the waste of air can be eliminated.

Further, since the structure for controlling the secondary side negative pressure by adjusting the intake of air in the negative pressure port and the supply of air to the negative pressure port, an air source can be eliminated.

Further, since the secondary side negative pressure is controlled by adjusting the intake of the air in the negative pressure port and the supply of air to the negative pressure port, the secondary side negative pressure with a low degree of vacuum can be maintained. Can be controlled.

In this case, a regulator main body having a negative pressure port, a pressure sensor for detecting the secondary side negative pressure in the negative pressure port, and an intake two-way valve for sucking air in the negative pressure port, A two-way valve for air supply for supplying the atmosphere to the negative pressure port, for intake according to the differential pressure between the secondary side negative pressure detected by the pressure sensor and the set negative pressure indicated by an input signal from the outside. Since the structure is such that the energization time to the air supply two-way valve is adjusted and the secondary side negative pressure is controlled to the set negative pressure, the pressure sensor detects the secondary side negative pressure, and the detected secondary The feedback control of the side negative pressure can improve the control accuracy.

[0016]

1 is a sectional view showing a vacuum electropneumatic regulator which is an embodiment of the present invention.

The vacuum electropneumatic regulator in this embodiment is a direct-acting type that regulates the intake of air in the negative pressure port 1 and the supply of air to the negative pressure port 1 to control the secondary side negative pressure. , Has a regulator body 2.

The regulator body 2 has an intake port 3 and an air supply port 4 formed on one side, and a negative pressure port 1 formed on the other side.

In addition, the regulator body 2 has a suction port 2
A two-way valve 5 and a two-way valve 6 for air supply are installed, and
The one-way valve 5 has a valve structure that switches between suctioning and stopping the air in the negative pressure port 1, and the two-way air supply valve 6 has a valve structure that switches between supplying and stopping the atmosphere to the negative pressure port 1.

A pressure sensor 7 is connected to the negative pressure port 1, and the pressure sensor 7 detects the secondary side negative pressure in the negative pressure port 1 and sends the detected signal to the controller 8. There is.

The controller 8 compares the set negative pressure indicated by an external input signal with the secondary negative pressure detected by the pressure sensor 7 and fed back to obtain a differential pressure, and in accordance with this differential pressure. It has a function of adjusting the energization time (pulse width) to the intake and supply two-way valves 5 and 6, adjusting the pilot negative pressure in the pilot chamber, and controlling the secondary side negative pressure to the set negative pressure.

Next, the operation of this embodiment will be described.

When the degree of vacuum is raised and the secondary side negative pressure is controlled to the set negative pressure, when an input signal is input, the set negative pressure indicated by this input signal and the secondary side negative pressure detected by the pressure sensor 7 are detected. The differential pressure is obtained, the energization time to the intake two-way valve 5 is adjusted according to this differential pressure, and the intake two-way valve 5 is turned on for the adjusted energization time, and the air in the negative pressure port 1 is Is the intake port 3
More vacuum is sucked by the vacuum pump, and the degree of vacuum in the negative pressure port 1 rises.

The secondary side negative pressure at which the degree of vacuum rises is detected by the pressure sensor 7, is compared with the set negative pressure indicated by the input signal by the controller 8, and when they match, the intake two-way valve 5 is closed.

When the secondary side negative pressure is controlled to the set negative pressure by lowering the degree of vacuum, when an input signal is input, the set negative pressure indicated by the input signal and the secondary side negative pressure detected by the pressure sensor 7 are detected. The differential pressure is obtained, the energization time to the air supply two-way valve 6 is adjusted according to this differential pressure, and the air supply two-way valve 6 is turned on for the adjusted energization time, Is supplied to the negative pressure port 1, and the degree of vacuum thereof is lowered.

The secondary side negative pressure at which the degree of vacuum decreases is detected by the pressure sensor 7, is compared with the set negative pressure indicated by the input signal by the controller 8, and when they match, the air supply two-way valve 6 is closed.

As described above, the intake of the air in the negative pressure port 1 and the supply of air to the negative pressure port 1 can be adjusted to control the secondary side negative pressure, so that the intake flow rate is reduced and the waste of air is eliminated. be able to.

Further, since the secondary side negative pressure is controlled by adjusting the intake of air in the negative pressure port 1 and the supply of air to the negative pressure port 1, the air source can be eliminated. ..

Further, since the secondary side negative pressure is controlled by adjusting the intake of air in the negative pressure port 1 and the supply of air to the negative pressure port 1, the secondary side negative pressure having a low vacuum degree is obtained. Can also be controlled.

Since the pressure sensor 7 detects the secondary side negative pressure and the feedback control of the detected secondary side negative pressure is performed, the control accuracy can be improved.

Although the invention made by the present inventor has been specifically described based on the embodiments, the present invention is not limited to the embodiments and various modifications can be made without departing from the scope of the invention. Needless to say.

[0032]

The effects obtained by the typical ones of the inventions disclosed in the present application will be briefly described as follows.
It is as follows.

(1). Since the structure is such that the intake of air in the negative pressure port and the supply of air to the negative pressure port are adjusted to control the secondary side negative pressure, the intake flow rate is reduced and air is wasted. It can be lost.

(2) The air source can be dispensed with because the structure is such that the intake of air in the negative pressure port and the supply of air to the negative pressure port are adjusted to control the secondary side negative pressure.

(3). Since the secondary side negative pressure is controlled by adjusting the intake of air in the negative pressure port and the supply of air to the negative pressure port, the secondary side negative pressure with a low degree of vacuum is controlled. Can also be controlled.

(4) In the case of (1), the regulator body having a negative pressure port, the pressure sensor for detecting the secondary side negative pressure in the negative pressure port, and the air in the negative pressure port are sucked. A two-way valve for intake and a two-way air supply valve for supplying the atmosphere to the negative pressure port, and a secondary side negative pressure detected by the pressure sensor and a set negative pressure indicated by an input signal from the outside. Since the energization time to the intake and air supply two-way valves is adjusted according to the differential pressure of, and the secondary side negative pressure is controlled to the set negative pressure,
The pressure sensor detects a negative pressure on the secondary side, and the detected 2
By the feedback control of the secondary side negative pressure, the control accuracy can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a vacuum electropneumatic regulator that is an embodiment of the present invention.

[Explanation of symbols]

 1 Negative pressure port 2 Regulator body 3 Intake port 4 Air supply port 5 Intake 2-way valve 6 Air supply 2-way valve 7 Pressure sensor 8 Controller

Claims (2)

[Claims] 1. A vacuum electropneumatic regulator characterized by adjusting the intake of air in the negative pressure port and the supply of air to the negative pressure port to control the secondary side negative pressure. 2. The vacuum electropneumatic regulator according to claim 1, wherein a regulator body having a negative pressure port, and a pressure sensor for detecting a secondary side negative pressure in the negative pressure port,
An intake two-way valve for sucking air in the negative pressure port, and an air supply two-way valve for supplying air to the negative pressure port are provided.
The energization time to the intake and air supply two-way valves is adjusted according to the differential pressure between the secondary side negative pressure detected by the pressure sensor and the set negative pressure indicated by the input signal from the outside. An electro-pneumatic regulator for vacuum characterized by controlling the negative pressure to a set negative pressure.