JP3283856B2 - Pressure control valve for vacuum - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum pressure control valve.

[0002]

2. Description of the Related Art In a conventional pressure control valve of this type, the pressure in a pilot chamber is controlled by using air supplied from an air supply source such as a compressor.

[0003]

However, since an air supply source and a pipe for supplying air from the air supply source are necessary, if the piping configuration is complicated in combination with the piping for the vacuum line, I had no choice.

[0004] The present invention has been made in view of the problems existing in the prior art, and has as its object to eliminate the need for a gas supply source for controlling the pressure in the pilot chamber. It is another object of the present invention to provide a vacuum pressure control valve that can simplify a piping configuration.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an intake passage having a set pressure port at one end and a vacuum pressure port at the other end. An intake opening / closing unit provided in the intake flow path between the set pressure port and the vacuum pressure port, for opening and closing the flow path ;
Control to control the atmospheric pressure and vacuum pressure introduced into the lot chamber
Means and the control means for controlling the pressure of the set pressure port
In response to pressure variations in the atmospheric pressure and the vacuum pressure is controlled by, and the vacuum pressure control valve having a pressure receiving body for opening and closing the intake opening portion.

According to the second aspect of the present invention, the intake flow path formed between the set pressure port and the vacuum pressure port, and the air supply flow path formed between the set pressure port and the atmospheric pressure port. An intake opening / closing unit provided in the intake passage for opening and closing the passage; an air supply opening / closing unit provided in the supply passage for opening and closing the passage; and an atmospheric pressure and a vacuum pressure guided into the pilot chamber. When
Control means for controlling the pressure of the set pressure port.
Atmospheric pressure and vacuum pressure controlled by the control means
Depending on the pressure variation, and a vacuum pressure control valve having a pressure receiving body for opening and closing the two opening portions individually.

Therefore, according to the above two inventions, since the pressure in the pilot chamber is controlled using the atmospheric pressure and the vacuum pressure, a gas supply source for controlling the pressure in the pilot chamber as in the prior art is provided. Piping is no longer needed. For this reason, the piping configuration is simplified.

According to a third aspect of the present invention, in the vacuum pressure control valve according to the first or second aspect, the control means includes an air supply having one end communicating with the atmosphere and the other end communicating with the pilot chamber. An air supply side solenoid valve for controlling the opening and closing of a passage, and an exhaust side solenoid valve for controlling the opening and closing of an exhaust passage having one end vacuum-sucked and the other end connected to the pilot chamber.

Therefore, according to the present invention, the use of the solenoid valve for controlling the pressure in the pilot chamber reduces the possibility that the pressure in the pilot chamber leaks or flows into the same chamber. It is possible to increase the pressure tightness.

According to a fourth aspect of the present invention, in the vacuum pressure control valve according to the third aspect, one end of the exhaust path is opened to the vacuum pressure port. Therefore, according to the present invention,
Since the vacuum suction point is shared by the vacuum pressure port, the piping configuration of the vacuum line is also simplified.

According to a fifth aspect of the present invention, in the vacuum pressure control valve according to any one of the first to fourth aspects, a pressure sensor for detecting a pressure of the set pressure port is provided, and the control means controls the pressure of the set pressure port. The pressure in the pilot chamber is controlled based on the detection signal of the sensor.

Therefore, according to the present invention, the pressure in the pilot chamber is controlled by feeding back the pressure of the set pressure port detected by the pressure sensor, so that the pressure control of the set pressure can be performed accurately. .

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, the first to third embodiments will be described below, but of these embodiments, only the second embodiment is related to the present invention. [First Embodiment] A first embodiment will be described below with reference to FIGS.

First, an outline of the dispenser device shown in FIG. 2 will be described. A tank 1 contains a liquid 2 to be fed under pressure such as juice, and is cooled by a cooling device (not shown). (Hereinafter simply referred to as gas). The gas in the cylinder 3 is supplied to the tank 1 via the pressure reducing valve 4, the pressure control valve 5, and the check valve 6.
And the on-off valve 7 is opened.
The fluid 2 under pressure is pressure-fed from the inside of the tank 1 to the container 8 such as a cup via the on-off valve 7.

The pressure control valve 5 is controlled by a D / A converter 1 by a control unit 9 including a CPU (central processing unit) and a memory.
Opening / closing control is performed via the pressure control circuit 11 and the pressure control circuit 11, and the pressure application amount of the gas to the pressure-supplied liquid 2 in the tank 1 is set. The opening and closing valve 7 is controlled to be opened and closed by the control device 9, and supplies the liquid-feeding rod 2 to the container 8.

The structure of the pressure control valve 5 will now be described in detail with reference to FIG. 1. A high-pressure gas flow path 13 is formed in a valve frame 12, and an air supply port 14 and an output port 15 are provided at both ends. Have been. An opening / closing section 16 for opening / closing the flow path 13 includes a valve seat 17 and a valve element 18, and is always closed by a spring 19.

The cover plate 20 and the diaphragm 21 are mounted on the upper surface of the valve frame 12 by a plurality of bolts 22. An upper pressure chamber 23a is formed between the cover plate 20 and the diaphragm 21. Lower pressure chamber 23
b is formed. The valve stem 24 is fixed to the diaphragm 21 by a nut 25. When the internal pressure of the upper pressure chamber 23a rises and the diaphragm 21 is moved downward, the valve element 18 of the opening / closing section 16 is opened via the valve stem 24. Let it.

The air supply passage 26 is connected to the air supply port 1 of the flow passage 13.
4 and the upper pressure chamber 23a.
And an orifice 27 for squeezing is provided in the middle thereof. The communication path 24a is formed vertically along the center of the valve stem 24 so as to connect the output port 15 side of the flow path 13 and the lower pressure chamber 23b. An air supply side valve 28 composed of an electromagnetic valve is provided on the cover plate 20 so as to control the opening and closing of the air supply passage 26, and if necessary, introduces high-pressure gas into the upper pressure chamber 23a to increase its internal pressure. Let it. Then, due to the increase in the internal pressure of the upper pressure chamber 23a, the valve rod 24 is lowered and the opening / closing section 16 is opened.

An exhaust passage 29 is formed in the cover plate 20 so as to communicate the upper pressure chamber 23a with the outside, and an orifice 30 for restricting is provided in the middle thereof. An exhaust-side valve 31 composed of a solenoid valve is provided on the cover plate 20 so as to control opening and closing of the exhaust passage 29, and discharges gas in the upper pressure chamber 23a to the outside as necessary to reduce the internal pressure. . Then, the valve rod 24 is raised by the decrease in the internal pressure of the upper pressure chamber 23a, the valve body 18 is raised by the spring 19, and the opening / closing section 16 is closed.

The pressure sensor 32 is provided on the cover plate 20,
The internal pressure of the upper pressure chamber 23a is detected through the communication hole 33 and a detection signal is output. The cover 34 is mounted on the cover plate 20 and covers the air supply side valve 28, the exhaust side valve 31 and the pressure sensor.

A gas discharge passage 35 is formed in the valve frame 12 so as to communicate with the output port 15 side of the flow passage 13, and an exhaust port 36 is provided at an end thereof. Discharge path 35
The opening / closing part 37 for opening and closing the valve is constituted by a valve seat 38 and a valve body 39, and is always closed by a spring 40. When the gas pressure on the output port 15 side of the flow path 13 increases, the valve body 39 of the opening / closing section 37 is opened against the spring 40, and the gas pressure in the flow path 13 is exhausted from the exhaust port 36. You.

The diaphragm 21 has a spring 40A.
Urged upward. Next, the pressure control valve 5
The pressure control circuit for controlling the opening and closing of the pressure sensor will be described in detail with reference to FIG. 3. The controller 9 is configured by a keyboard or the like for setting, and inputs external data such as temperature data of the liquid to be pressure-transferred 2 and an amount of pressure-transfer to the control device 9.
The control device 9 sets the pressure of the output port 15 necessary for the pressure-feeding of the liquid 2 under pressure as a target value based on the input data, and outputs the target value to the D / A converter 10. D / A converter 10
Converts a signal corresponding to the input target value into an analog signal, and outputs the analog signal to the pre-amplifier 42 as a set voltage signal.
The pre-amplifier 42 adjusts the set voltage signal to a zero point and a span, and outputs it to the deviation amplifier 43 as a reference input signal.

The deviation amplifier 43 compares a detection signal fed back from the pressure sensor 32 in the pressure control valve 5 via the amplifier 44 with a reference input signal from the pre-amplifier 42 and shown in FIGS. Thus, the deviation is amplified to output a control deviation signal. Comparator 4 as comparison means
Reference numerals 5 and 46 denote a control deviation signal from the deviation amplifier 43 and 50 Hz to 200 Hz output from the reference signal generator 47.
The control signal is compared with a reference signal such as a triangular wave or a sawtooth wave, and an ON / OFF control operation signal is output to the supply side valve 28 or the exhaust side valve 31 of the pressure control valve 5 via the drive circuits 48 and 49. . Then, the supply valve side 28 and the exhaust side valve 31 are controlled to open and close at a duty ratio according to the ON / OFF cycle of the control operation signal.

In this case, as shown in FIGS. 4 and 5, the comparator 46 on the exhaust valve 31 side is inverted with respect to the control deviation signal input to the comparator 45 on the air supply valve 28 side. Control deviation signal is input.

FIG. 1 shows the supply and exhaust valves 28,
31 shows a state in which the pressure in the upper pressure chamber 23a and the pressure in the lower pressure chamber 23b are balanced in a low pressure state. In this state, the valve stem 24 is in the neutral position and the upper and lower opening / closing parts 37, 1
6 is closed. At this time, the on-off valve 7 shown in FIG. 2 is also closed.

In this state, when the liquid is poured into the container 8, the control device 9 opens the on-off valve 7 based on the operation of the switch of the input device 41 or the like. At the same time, the control device 9 sets and outputs a target value corresponding to the optimum pressure of the output port 15 based on data such as the pressure in the cylinder 3, the gas temperature, and the temperature of the liquid to be sent. This output is input to the deviation amplifier 43 as a reference input device via the D / A converter 10 and the pre-amplifier 42 shown in FIG.

On the other hand, a signal of a level corresponding to the pressure value in the upper pressure chamber 23a detected by the pressure sensor 32 is fed back to the deviation amplifier 43. The deviation amplifier 43 compares the reference input signal with the feedback signal and outputs a control deviation signal corresponding to the difference between the pressure in the upper pressure chamber 23a and its target value. The control deviation signal is input to the comparator 46 via the comparator 45 and the inverting circuit 51. In this case, for example, the upper pressure chamber 2
When the pressure at 3a is smaller than the target value, the control deviation signals input to the comparators 45 and 46 are mutually inverted as shown in FIGS. Vessel 4
5 is the exhaust side valve 3 as the deviation of the supply side valve 28 on the open side.
The comparator 46 on the first side is input as a deviation on the closed side.

Therefore, the comparator 45 is provided with a reference signal generator 47.
, A control operation signal corresponding to the deviation is output, but the comparator 46 outputs no or almost no control operation signal. If the pressure at the output port 15 is higher than the target value, the reverse is true. For this reason,
The supply side valve 28 is adjusted so that the output port 15 has an optimum pressure.
The opening and closing of the exhaust side valve 31 is controlled, an appropriate amount of gas pressure is applied to the inside of the tank 1, and the liquid is poured into the container 8 in an optimum state.

Then, when a switch operation for stopping the supply is performed, the on-off valve 7 is closed and the liquid supply is stopped. During the opening and closing operations of the air supply side valve 28 and the exhaust side valve 31, the control device 9 is set to an optimum value in accordance with various factors such as gas pressure and liquid temperature or so as to prevent inconvenience such as water hammer. Set the target value and double valve 2
Since the control amount data of 8, 31 is fed back and controlled to match the target value, an optimal liquid supply state can be obtained.

Further, when the liquid supply is not being performed, the exhaust side valve 31 is closed to prevent gas leakage, and the gas alone is discharged to the outside when the supply of the liquid to be fed is stopped and the diaphragm 21 is returned. The discharge amount is extremely small because of the reduced size of the upper pressure chamber 23a.
In particular, when the pressure supply source is a cylinder and the amount of gas is limited, as in a dispenser device used in a vending machine for drinking water, the gas can be effectively used. [Second Embodiment] Next, a second embodiment will be described with reference to FIGS. In addition, about the structure which is the same as or similar to the said 1st Embodiment, the same code | symbol as 1st Embodiment is attached | subjected and those detailed description is abbreviate | omitted.

The pressure control valve 5 according to this embodiment is embodied in controlling vacuum pressure when, for example, performing suction and release operations of articles using vacuum pressure.
As shown in FIG. 8, the output port 15 of the flow path 13 is connected to a set pressure port connected to a negative pressure device such as a tank.
Reference numeral 4 denotes a vacuum pressure port connected to a suction pump, and an exhaust port 36 serves as an atmospheric pressure port for taking in the atmosphere.

Therefore, in this embodiment, the intake passage is constituted by the passage 13, and the supply passage is constituted by the discharge passage 35. The opening / closing section 16 forms an intake opening / closing section, and the opening / closing section 37 forms an air supply opening / closing section.

The air supply passage 26 is provided so as to communicate the lower pressure chamber 23b below the diaphragm 21 with the atmosphere. In the middle of the air supply passage 26, an air supply side valve 2 for controlling the opening and closing of the air supply passage 26 is provided.
8 are interposed. The exhaust path 29 is provided so as to communicate the vacuum pressure port 14 of the flow path 13 with the lower pressure chamber 23b, and an exhaust valve 31 for controlling the opening and closing of the exhaust path 29 is interposed midway.

The pressure sensor 32 is connected to the set pressure port 15 through the communication hole 33, and detects the set pressure and outputs a detection signal. The upper pressure chamber 23a above the diaphragm 21 as a pressure receiving body is communicated with the set pressure port 15 via a communication passage 24a at the center of the valve rod 24 and the valve body 18 of the opening / closing section 16 and the valve rod 24. The set pressure is led to the upper pressure chamber 23a. Therefore, in this embodiment, the lower pressure chamber 23b is a pilot chamber.

As shown in FIG. 9, also in this embodiment, the detection signal of the set pressure outputted from the pressure sensor 32 and the input signal are substantially the same as the circuit configuration of the first embodiment. And the deviation signal is compared. The deviation signal and the reference signal from the reference signal generation circuit 47 are compared and added by the signal comparison circuit 46 via the signal comparison circuit 45 and the inversion circuit 51, and the ON / OFF signal is driven. The signals are input to the supply valve 28 and the exhaust valve 31 via the circuits 48 and 49. In this way, the duty ratio of the on / off signal of the air supply side valve 28 and the exhaust side valve 31 is controlled, and when there is a deviation, both valves 28 and 31 are driven to lower the lower pressure chamber 23b in a direction to reduce the deviation. The pressure is adjusted.

That is, an external command signal is input to the control circuit 11 as an input signal. The deviation amplifier 43 in the control circuit 11 compares the signal detected by the sensor 32 with the pressure on the set pressure side with the input signal, and performs deviation amplification.

This deviation signal is supplied to a comparator 45,
The comparator 46 compares and adds the signal from the reference signal generating circuit 47 via the inverting circuit 51, and outputs an on / off signal to the driving circuits 48 and 49.

As described above, the duty ratio of the on / off signal of the valves 28 and 31 is controlled. When deviation exists, valve 2
8, 31 are driven, and the pressure of the lower pressure chamber 23b is adjusted in the direction in which the deviation decreases.

Then, the vacuum pressure is guided from the vacuum pressure port 14 to the secondary side of the exhaust side valve 31, and the operating pressure by the on / off operation of the supply side valve 28 and the exhaust side valve 31 passes through the supply path 26.
The pressure of the lower pressure chamber 23b is set. Supply side valve 28-1
The next side is open to the atmosphere, and thus the operating pressure can be from vacuum to atmospheric pressure. Accordingly, in this embodiment, the control means is constituted by the air supply side valve 28 and the exhaust side valve 31.

The air at the set pressure port 15 is supplied to the valve rod 24.
Orifice between valve and valve body and communication passage 24 for valve stem 24
a to the upper pressure chamber 23a. When the input signal to the control circuit 11 changes and the pressure in the lower pressure chamber 23b increases, the valve body 39 is pushed up, and air flows from the atmospheric pressure port 36 to the set pressure port 15.

When the input signal changes from the equilibrium state of the pressure to the direction of decreasing the pressure, the pressure in the lower pressure chamber 23b is reduced and becomes closer to vacuum. As a result, the diaphragm 21 is pushed down, the valve element 18 is lowered together with the valve rod 24, and air flows to the vacuum pressure port 14. And the upper pressure chamber 23a
When the pressure in the lower pressure chamber 23b becomes equal to the pressure in the lower pressure chamber 23b, an equilibrium state is established.

Therefore, also in the second embodiment, it is possible to control the vacuum pressure while minimizing air leakage. In the second embodiment, since the pressure in the lower pressure chamber 23b is controlled using the atmospheric pressure and the vacuum pressure,
An air supply source and piping for controlling the pressure in the lower pressure chamber 23b are not required, and the piping configuration can be simplified.

The present invention is not limited to the configuration of the second embodiment, but may be embodied by arbitrarily changing the configuration of each unit without departing from the spirit of the present invention. . Third Embodiment Next, a third embodiment will be described with reference to FIGS.
3 will be described. The same or similar components as those of the first and second embodiments are denoted by the same reference numerals as those of the first and second embodiments, and detailed description thereof will be omitted.

Now, the pressure control valve 5 of this embodiment is also embodied to control the vacuum pressure in the case of performing the suction and release operations of the article using the vacuum pressure, as in the second embodiment described above. As shown in FIGS. 10 to 12, the set pressure port 15 of the flow path 13 is connected to a set pressure port connected to a negative pressure device such as a tank, and the vacuum pressure port 14 is connected to a suction pump. The supply pressure port 36 is a supply pressure port for supplying a predetermined pressure of about several kgf / cm ² to the vacuum pressure port 14.

The switching valve 52 is provided on the cover plate 20, and the pressure on the supply pressure port 36 side is guided to the switching valve 52 via the air supply passage 26, the air supply side valve 28, and the output side flow path 53. Depending on the switching state of the switching valve 52, the upper pressure chamber 2
3a or through the flow passage 55 to the lower pressure chamber 23b. The exhaust ports 56 and 57 are provided in the switching valve 52,
Depending on the switching state of the switching valve 52, the pressure in the upper pressure chamber 23a or the lower pressure chamber 23b is exhausted from the exhaust ports 56 and 57.

The exhaust side valve 31 is connected to the output side flow path 53 of the supply side valve 28, and the output side pressure is discharged through the exhaust path 29 when the exhaust side valve 31 is opened. First pressure sensor 3
Reference numeral 2 is connected to the set pressure port 15 through the communication hole 33, detects the set pressure, and outputs a detection signal. The second pressure sensor 58 is connected to the output flow path 53 of the intake valve 28, detects the output pressure, and outputs a detection signal.

As shown in FIG. 13, in this embodiment, a detection signal of the set pressure output from the first pressure sensor 32 and an input signal are compared by a deviation amplifier 43 to perform deviation amplification. The deviation signal and the reference signal are compared by the comparator 59, and the switching valve 5
2 is switched. Further, the deviation signal from the deviation amplifier 43 and the detection signal from the second pressure sensor 58 are compared and amplified by the deviation amplifier 61, and the deviation signal and the deviation signal are amplified similarly to the circuit configuration of the second embodiment. The reference signal from the reference signal generation circuit 47 is compared and added by the signal comparator 46 via the signal comparator 45 and the inversion circuit 51, and the on / off signal is supplied via the drive circuits 48 and 49 to the air supply side valve 28 and the exhaust gas. It is input to the side valve 31.

As described above, if the input signal is large relative to the detection signal of the first pressure sensor 32, the switching valve 52 can pressurize the lower pressure chamber 23b. If the input signal is small, the switching valve 52 is switched to a state in which the upper pressure chamber 23a can be pressurized. In this state, the duty ratio of the on / off signal of the supply side valve 28 and the exhaust side valve 31 is controlled, and there is a deviation. At this time, the valves 28 and 31 are driven to adjust the pressures of the upper or lower pressure chambers 23a and 23b in a direction in which the deviation becomes smaller.

That is, the supply pressure port 36 has 5-6 kgf
/ Cm ² , which is led to the input of the inlet valve 28. The output of the supply-side valve 28 is guided to the exhaust-side valve 31 and, at the same time, to the upper or lower pressure chambers 23a and 23b as the operating pressure via the switching valve 52.

This operating pressure is input to the control circuit by the second pressure sensor 58, and the air supply side valve 28 and the exhaust side valve 31 are turned on and off, and the pressure in the upper or lower pressure chamber 23a, 23b is operated. Further, a deviation between the first pressure sensor 32 and the input signal is obtained, and the switching valve 52 is operated. When the input signal is large relative to the signal of the first pressure sensor 32, the pressure is switched so that the lower pressure chamber 23b can be pressurized, and when the input signal is small, the upper pressure chamber 23a can be pressurized. Thus, the operating pressure can be controlled with the minimum necessary air.

When the input signal changes so as to lower the set pressure, the switching valve 52 is switched so that the upper pressure chamber 23a can be pressurized based on the difference between the signal from the first pressure sensor 32 at the set pressure port 15 and the input signal. At this time, the lower pressure chamber 23b
Becomes atmospheric pressure.

The deviation is again obtained by the deviation signal and the signal of the first pressure sensor 32 leading to the operating pressure, and the air supply side valve 28 and the exhaust side valve 31 are turned on and off so as to reduce this deviation. That is, the operating pressure corresponding to the previous deviation signal is sent to the upper pressure chamber 23a.

At this time, the diaphragm 21 is pushed down, the lower opening / closing section 16 is opened, and the air in the set pressure port 15 flows to the vacuum pressure port 14. When the pressure at the set pressure port 15 decreases, the deviation between the input signal and the first pressure sensor 32 decreases, and the operating pressure approaches the atmospheric pressure. For this reason, the opening degree of the opening / closing section 16 becomes smaller, and when the deviation is zero, the equilibrium state shown in FIGS.

Next, when the input signal changes so as to increase the set pressure, the switching valve 52 operates to pressurize the lower pressure chamber 23b from the deviation between the first pressure sensor 32 and the input signal as described above ( At this time, the upper pressure chamber 23a becomes the atmospheric pressure.)

The deviation signal and the signal of the second pressure sensor 58 connected to the operating pressure again take a deviation, and the air supply side valve 28 and the exhaust side valve 31 are turned on / off in accordance with the previous deviation signal, and the operating pressure Is sent to the lower pressure chamber 23b. Therefore, the diaphragm 21 is pushed up, the upper opening / closing part 37 is opened, and the air in the supply pressure port 36 flows to the set pressure port 15.

When the pressure at the set pressure port 15, that is, the signal of the first pressure sensor 32 approaches the input signal (when the deviation signal decreases), the operation pressure approaches the atmospheric pressure. For this reason, the opening degree of the opening / closing part 37 becomes small, and when the deviation is zero, the state becomes an equilibrium state.

In the above operation, since a pressure of 5 to 6 kgf / cm ² is supplied to the supply pressure port 36, vacuum breakage with a faster reaction can be performed. Further, when a deviation occurs, the pressure chambers 23a, 23b at the atmospheric pressure are set.
If the pressure is guided to the vacuum side, a faster response can be expected.

In the third embodiment, a pressure port different from the supply pressure port 36 is provided, and the pressure port is connected to the pressure chamber 2.
3a, 23b are configured to be supplied with operating pressure,
It is also possible to further improve the responsiveness.

[0059]

As described in detail above, according to the present invention,
Since the pressure in the pilot chamber is controlled using the atmospheric pressure and the vacuum pressure, a gas supply source and piping for controlling the pressure in the pilot chamber, which were conventionally required, are not required, and the piping configuration is simplified. Can be.

[Brief description of the drawings]

FIG. 1 is a front sectional view showing a first embodiment.

FIG. 2 is a piping diagram showing an outline of a dispenser device.

FIG. 3 is a block diagram showing a circuit configuration of the liquid supply device.

FIG. 4 is an explanatory diagram illustrating an operation of generating a drive signal for an exhaust side and an air supply side valve.

FIG. 5 is an explanatory diagram for explaining an operation of generating a drive signal for an exhaust side valve and an air supply side valve.

FIG. 6 is a front sectional view showing a second embodiment.

FIG. 7 is a side sectional view of a pressure control valve.

FIG. 8 is a schematic diagram of a control device including a pressure control valve.

FIG. 9 is a block diagram showing a circuit configuration of a control device.

FIG. 10 is a front sectional view showing a third embodiment.

FIG. 11 is a side sectional view of a pressure control valve.

FIG. 12 is a schematic diagram of a control device including a pressure control valve.

FIG. 13 is a block diagram showing a circuit configuration of the control device.

[Explanation of symbols]

13: flow path as intake flow path, 14: vacuum pressure port, 15
... set pressure port, 16 ... opening / closing section as intake opening / closing section, 21
... a diaphragm as a pressure receiving body, 23b ... a lower pressure chamber as a pilot chamber, 26 ... an air supply path, 28 ... an air supply side valve constituting a control means, 29 ... an exhaust path, 31 ... an exhaust side valve constituting a control means 32, a pressure sensor; 35, a discharge path as an air supply passage; 36, an atmospheric pressure port; 37, an opening / closing section as an air supply opening / closing section.

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-20605 (JP, A) JP-A-2-284213 (JP, A) JP-A-63-30675 (JP, A) 81781 (JP, U)

Claims (5)

(57) [Claims] An intake passage having a set pressure port formed at one end and a vacuum pressure port formed at the other end; and an intake flow path provided between the set pressure port and the vacuum pressure port, Controls the intake air opening / closing unit that opens and closes the flow path, and the atmospheric pressure and vacuum pressure guided into the pilot chamber
Control means, for the pressure of the set pressure port, by the control means
In response to pressure variations in the atmospheric pressure and the vacuum pressure is controlled, vacuum pressure control valve having a pressure receiving body for opening and closing the inlet opening portion. 2. An intake channel formed between a set pressure port and a vacuum pressure port, an air supply channel formed between the set pressure port and an atmospheric pressure port, and provided in the intake channel. An intake opening / closing section for opening and closing the flow path; an air supply opening / closing section provided in the air supply flow path for opening and closing the flow path ; and controlling an atmospheric pressure and a vacuum pressure guided into the pilot chamber.
Control means, for the pressure of the set pressure port, by the control means
In response to pressure variations in the atmospheric pressure and the vacuum pressure is controlled, vacuum pressure control valve having a pressure receiving body for opening and closing the two opening portions individually. 3. An air supply side solenoid valve for controlling opening and closing of an air supply passage having one end communicating with the atmosphere and the other end communicating with the pilot chamber, and one end of the control means being connected to the pilot chamber. The pressure control valve for vacuum according to claim 1 or 2, wherein the pressure control valve for vacuum comprises an exhaust-side solenoid valve that controls opening and closing of an exhaust path communicated with the chamber. 4. The vacuum pressure control valve according to claim 3, wherein one end of the exhaust path is opened to the vacuum pressure port. 5. The pressure sensor according to claim 1, further comprising a pressure sensor for detecting a pressure of the set pressure port, wherein the control unit controls the pressure in the pilot chamber based on a detection signal of the pressure sensor. The pressure control valve for vacuum described in Crab.