JP2016084895A - Valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device capable of, with a simple configuration, separating a main valve element from a main valve seat and keeping the main valve element in a state of being stably separated.SOLUTION: A valve device comprises: a branch passage 8a communicating with a main valve opening-closing chamber 8 and connected to an intake air source 2; negative pressure elimination means 10 for eliminating negative pressure of the main valve opening-closing chamber 8; and hold means 13 provided in the main valve opening-closing chamber 8 and for holding a main valve element 12 separated from a main valve seat 9. When negative pressure is supplied to the main valve opening-closing chamber 8, the main valve element 12 is separated from the main valve seat 9 by a differential pressure between the main valve opening-closing chamber 8, and an input chamber 6 and an output chamber 7, and the hold means 13 holds the main valve element 12. From this state, when the negative pressure elimination means 10 eliminates the negative pressure of the main valve opening-closing chamber 8, the hold means 13 releases the main valve element 12, and the main valve element 12 sits on the main valve seat 9.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a valve device, and more specifically, an input chamber to which negative pressure is supplied, an output chamber communicating with an exhausted object, a main valve opening / closing chamber formed on the opposite side of the input chamber and the output chamber with a diaphragm interposed therebetween It is related with the valve apparatus provided with.

Conventionally, an input chamber to which negative pressure is supplied, an output chamber formed adjacent to the input chamber and communicating with the exhausted object, and a main body formed on the opposite side of the input chamber and the output chamber with the diaphragm interposed therebetween. There is known a valve device including a valve opening / closing chamber, a main valve seat formed at a boundary between the input chamber and the output chamber, and a main valve body provided in the diaphragm and seated on the main valve seat. (Patent Document 1).
A cylinder having a piston larger in diameter than the main valve body is connected to the main valve body of the valve device described in FIG. 1 of the above-mentioned Patent Document 1, and a negative pressure is supplied to the cylinder. The main valve body is separated from the main valve seat.
The conventional valve device shown in FIG. 7 has a structure in which a cylinder is connected to the main valve body, similar to the valve device of FIG. 1 of Patent Document 1, but a positive pressure source is used to drive the cylinder. A piston having a smaller diameter than that of the valve device of Patent Document 1 is operated.

JP 2004-239374 A

As described above, the valve device of Patent Document 1 and the conventional valve device shown in FIG. 7 each require a piston for opening and closing the main valve body. In particular, the conventional valve device shown in FIG. There is a problem that the configuration of the valve device becomes complicated, such as the need for a positive pressure source.
In the valve device having the above-described configuration, negative pressure flows through the gap between the main valve body and the main valve seat and flows from the input chamber to the output chamber. At that time, the main valve is displaced by the displacement of the diaphragm. If the gap between the body and the main valve seat varies, the supply of negative pressure to the exhausted object may become unstable.
In view of such a problem, the present invention provides a valve device capable of separating the main valve body from the main valve seat and holding the main valve body stably in a simpler configuration. It is to provide.

That is, the valve device according to the present invention includes an input chamber to which negative pressure from an intake source is supplied, an output chamber that is formed adjacent to the input chamber and communicates with an exhausted object, and an input that sandwiches the diaphragm. A main valve opening / closing chamber formed on the opposite side of the chamber and the output chamber, a main valve seat formed at the boundary between the input chamber and the output chamber, and provided on the diaphragm and seated on the main valve seat A main valve body that shuts off the input chamber and the output chamber;
When the main valve body seated on the main valve seat is separated from the main valve seat, the input chamber communicates with the output chamber to supply negative pressure to the exhausted object.
A branch passage communicating with the main valve opening / closing chamber and connected to the intake source, a negative pressure canceling means for canceling the negative pressure in the main valve opening / closing chamber, and the main valve seat provided in the main valve opening / closing chamber Holding means for holding the main valve body that is further separated,
When negative pressure is supplied to the main valve opening / closing chamber, the main valve body is separated from the main valve seat by the differential pressure between the main valve opening / closing chamber and the input chamber and the output chamber, and the holding means Holding the main disc,
When the negative pressure canceling means cancels the negative pressure in the main valve opening / closing chamber from this state, the holding means releases the main valve body, and the main valve body is seated on the main valve seat. Yes.

According to the above invention, when negative pressure is introduced from the branch passage to the main valve opening / closing chamber, the adsorption force acting on the main valve opening / closing chamber side across the diaphragm is larger than the adsorption force on the input chamber and output chamber sides. Therefore, the main valve body can be separated from the main valve seat, and driving by a cylinder or a positive pressure source is not necessary.
Further, since the separated main valve body is held by the holding means and the gap between the main valve body and the main valve seat can be kept constant, the negative pressure from the input chamber to the output chamber due to the flapping of the diaphragm Can be prevented from becoming unstable.

Sectional drawing of the valve apparatus concerning a present Example is shown, and the seating state of the main valve body is shown. Sectional drawing which showed the seating state of the said main valve body. The graph which showed the action | operation of the valve apparatus. The block diagram which showed an example of use of a valve apparatus. The graph which showed the action | operation of the valve apparatus in the structure of FIG. The graph which showed the action | operation of the valve apparatus in another structure. Sectional drawing of the conventional valve apparatus.

1 and 2 are sectional views of a valve device 1 according to the present invention. An intake source 2 for supplying a negative pressure to the valve device 1 of the present embodiment via a pipe P will be described below. And an exhausted object 3 such as a vacuum pack containing food or the like inside, and the negative pressure of the intake source 2 is supplied to the exhausted object 3 via the valve device 1. Yes.
The valve device 1 includes a lower housing 4 and an upper housing 5, and maintenance can be easily performed by separating the lower housing 4 and the upper housing 5.
Inside the lower housing 4 and the upper housing 5 are an input chamber 6 connected to the intake source 2, an output chamber 7 connected to the exhausted object 3, and the input chamber 6 and the output chamber 7. A formed main valve opening / closing chamber 8 is formed.
The input chamber 6 is formed in a cylindrical space formed substantially at the center of the lower housing 4, and a ring-shaped main valve seat 9 is provided at the upper surface opening. Further, an input passage 6 a connected to the intake source 2 through the pipe P is formed in the lower portion of the input chamber 6.
The output chamber 7 is formed so as to surround the main valve seat 9 at a position adjacent to the input chamber 6, and the lower portion of the output chamber 7 is connected to the exhausted object 3 through a pipe P. 7a is formed.

The main valve opening / closing chamber 8 is formed in the upper housing 5, is formed above the input chamber 6 and the output chamber 7, and a step is formed at the boundary with the output chamber 7. A branch passage 8 a connected to the intake source 2 is formed in the main valve opening / closing chamber 8.
The pipe P connected to the intake source 2 is branched in the middle of the connection position with the input passage 6a of the input chamber 6, and a branch pipe P1 connected to the branch passage 8a of the main valve opening / closing chamber 8 is connected. The branch pipe P1 is provided with a solenoid valve 10 as a negative pressure canceling means.
The electromagnetic valve 10 can be switched between a state in which negative pressure from the intake source 2 is supplied to the main valve opening / closing chamber 8 and a state in which the main valve opening / closing chamber 8 is opened to the atmosphere.

A stepped portion formed at the boundary between the main valve opening / closing chamber 8 and the output chamber 7 is provided with a flexible diaphragm 11, and the diaphragm 11 allows the main valve opening / closing chamber 8 and the input chamber 6. The output chamber 7 is partitioned in an airtight state.
A main valve body 12 is provided at the center of the diaphragm 11, and the main valve body 12 is seated on a main valve seat 9 provided at an upper end portion of the input chamber 6 when the diaphragm 11 is displaced. It has become.
When the main valve body 12 is seated on the main valve seat 9, the flow of negative pressure from the input chamber 6 to the output chamber 7 is interrupted, and when the main valve body 12 is separated from the main valve seat 9, the negative pressure of the input chamber 6 is reduced. The pressure flows into the output chamber 7, and the negative pressure is supplied to the exhausted object 3 through the output passage 7a.

With such a configuration, the valve device 1 operates as follows. First, when the intake source 2 supplies negative pressure from the state in which the main valve body 12 shown in FIG. 1 is seated on the main valve seat 9, negative pressure is supplied to the input chamber 6 through the input passage 6a. 12 maintains the seated state.
When the electromagnetic valve 10 is operated from this state and negative pressure flows into the main valve opening / closing chamber 8 via the branch pipe P1 and the branch passage 8a, the main pressure of the diaphragm 11 due to the negative pressure flowing into the main valve opening / closing chamber 8 is increased. The adsorption force acting on the valve opening / closing chamber 8 side becomes higher than the adsorption force acting on the input chamber 6 and the output chamber 7 side due to the negative pressure flowing into the input chamber 6.
As a result, as shown in FIG. 2, the diaphragm 11 is sucked and pulled up toward the main valve opening / closing chamber 8, whereby the main valve body 12 is separated from the main valve seat 9 and the input chamber 6 and the output chamber 7. And the negative pressure is supplied to the exhausted object 3.

Here, when the input chamber 6 and the output chamber 7 communicate with each other in this way and the exhaust proceeds, the adsorption force acting on the input chamber 6 and the output chamber 7 side of the diaphragm 11 is applied to the main valve opening / closing chamber 8 side. It will balance with the acting adsorption force.
When the adsorption force is balanced, the diaphragm 11 is applied with a force for returning to the original shape, so that the main valve body 12 is lowered and seated on the main valve seat 9, and the negative pressure to the output chamber 7 is reduced. Will be stopped.
However, when the supply of the negative pressure to the output chamber 7 is stopped, the suction force acting again on the main valve opening / closing chamber 8 side exceeds the suction force acting on the input chamber 6 and output chamber 7 side, so that the diaphragm 11 is pulled up again. Thus, the main valve body 12 is separated from the main valve seat 9.
As described above, when the diaphragm 11 moves up and down and the main valve body 12 repeats the seating and separation from the main valve seat 9, the negative pressure supply state and the shut-off state are intermittently repeated. Thus, there arises a problem that an unstable negative pressure as shown by a broken line in FIG.

In order to cope with such a problem, the valve device 1 of this embodiment is provided with a holding means 13 made of a magnet in the main valve opening / closing chamber 8, and the main valve seat 9 is separated from the main valve seat 9. The valve body 12 is held by the holding means 13.
The main valve body 12 is made of a material that can be magnetically attached by the magnet of the holding means 13, and the holding means 13 is configured so that the adsorption force on the main valve opening / closing chamber 8 side of the diaphragm 11 and the input chamber 6 are as described above. In the state where the suction force on the output chamber 7 side is balanced, the main valve body 12 has a magnetic force that can be held.
Thereby, when the main valve body 12 is separated from the main valve seat 9, the main valve body 12 can be held by the holding means 13, and as shown by a solid line in the graph of FIG. The supply of negative pressure by the device 3 can be performed stably.
The stable supply of the negative pressure in this way is, for example, to keep the porous object in a vacuum state for a predetermined time when the moisture is removed from the porous object containing moisture as an exhausted object. It is suitable.

The main valve body 12 held by the holding means 13 is configured to open the main valve opening / closing chamber 8 to the atmosphere by switching the electromagnetic valve 10 as the negative pressure eliminating means provided in the pipe P, thereby It can be seated on the seat 9.
That is, when the main valve opening / closing chamber 8 is opened to the atmosphere, the adsorption force on the input chamber 6 and output chamber 7 side in the diaphragm 11 exceeds the atmospheric pressure on the main valve opening / closing chamber 8 side.
The magnetic force of the holding means 13 is set lower than the attracting force on the input chamber 6 and the output chamber 7 side when the main valve opening / closing chamber 8 is opened to the atmosphere. Withdrawing and seating on the main valve seat 9, the supply of negative pressure to the output chamber 7 is stopped.
Thus, according to the valve device 1 of the present embodiment, a configuration such as a cylinder having a large-diameter piston in Patent Document 1 and a positive pressure source to the cylinder in the conventional valve device shown in FIG. 7 is not required. Therefore, the configuration of the valve device 1 can be simplified.

FIG. 4 shows a configuration in which the valve device 1 having the above-described configuration is used for evacuating a vacuum pack 3a containing a food containing liquid as the exhausted material 3 in a short time.
1 and 2, in this embodiment, the pipe P connected to the intake source 2 is further provided with a suction passage Pa connected to the exhausted object 3 without passing through the valve device 1. It has become.
More specifically, the suction passage Pa is connected to a position adjacent to the intake source 2 side of the electromagnetic valve 10 in the pipe P having one end communicating with the branch passage 8a, and the other end of the output chamber 7 is connected to the suction chamber Pa. It is connected to the output passage 7a.
The suction passage Pa is provided with a throttle valve (not shown) that adjusts the flow rate, so that the flow rate of the negative pressure flowing through the suction passage Pa is set lower than that of the large flow rate exhaust through the output passage 7a. Specifically, the flow rate is such that the liquid in the vacuum pack 3a is not brought into a boiling state due to a rapid pressure drop due to a large flow rate exhaust through the output passage 7a.
Further, a pipe P communicating with the branch passage 8a and a second electromagnetic valve 14 for opening and closing the suction passage Pa are provided on the upstream side of the connection position of the suction passage Pa in the pipe P communicating with the branch passage 8a.

FIG. 5 shows the state of negative pressure when air is exhausted from the vacuum pack 3a using the valve device 1 having the above configuration, where the vertical axis indicates negative pressure and the horizontal axis indicates elapsed time. . 5 indicates a graph when the vacuum pack 3a is evacuated by the negative pressure supplied only by the suction passage Pa.
First, the intake source 2 starts supplying negative pressure from a state where the intake source 2 is not supplying negative pressure. At that time, the second electromagnetic valve 14 is closed, and the negative pressure is supplied only to the input chamber 6 through the input passage 6a.
Thereafter, when the second electromagnetic valve 14 is opened, the negative pressure of the intake source 2 is supplied to the vacuum pack 3a via the suction passage Pa, and also supplied to the main valve opening / closing chamber 8 via the electromagnetic valve 10. Is done.
By supplying negative pressure to the main valve opening / closing chamber 8, the suction force on the main valve opening / closing chamber 8 side in the diaphragm 12 exceeds the suction force on the input chamber 6 and output chamber 7 sides, and the main valve body 12 becomes the main valve body 12. When the input chamber 6 and the output chamber 7 communicate with each other by separating from the valve seat 9, a negative pressure is supplied from the output chamber 7 to the vacuum pack 3 a.
As a result, negative pressure from the output chamber 7 and the suction passage Pa is supplied to the vacuum pack 3a, and the vacuum pack 3a suddenly becomes negative pressure.

In this way, when the vacuum pack 3a suddenly becomes a negative pressure and the negative pressure reaches a predetermined negative pressure, the liquid inside the vacuum pack 3a is brought to a boiling state. 7 is measured, and immediately before reaching the predetermined negative pressure, the electromagnetic valve 10 of the pipe P1 communicating with the main valve opening / closing chamber 8 is opened to the atmosphere.
As a result, the main valve opening / closing chamber 8 is opened to the atmosphere, the holding means 13 opens the main valve body 12, and the main valve body 12 immediately sits on the main valve seat 9, so that the negative pressure applied to the vacuum pack 3a is reduced. Supply is stopped.
Thereafter, the second electromagnetic valve 14 remains open, and the supply of negative pressure to the vacuum pack 3a through the suction passage Pa is continued. Since the flow rate of the negative pressure in the suction passage Pa is set to such an extent that the boiling state does not occur in the vacuum pack 3a, when the vacuum pack 3a is in a vacuum state thereafter, the vacuum pack 3a is sealed by heat sealing means (not shown). It has come to be.
As described above, by using the valve device 1 of the present embodiment, the vacuum pack 3a can be removed in a shorter time than when only the suction passage Pa is used without generating a boiling state in the vacuum pack 3a. It can be in a vacuum state.

FIG. 5 shows a graph when the inside of the vacuum pack 3a containing the liquid is evacuated using the valve device having the configuration of FIG. 4, whereas if the valve device having the configuration of FIG. 4 is used, FIG. Based on the graph shown in FIG. 6, the vacuum pack 3a containing the powder can be evacuated.
Here, when the vacuum pack 3a containing the powder is evacuated, if the pressure is reduced to the vacuum pack 3a from the beginning by the large flow exhaust through the output passage 7a, the powder in the vacuum pack 3a will rise. A problem occurs.
The following description will be made based on the graph of FIG. 6. First, the intake source 2 starts supplying negative pressure from a state where the intake source 2 does not supply negative pressure. At this time, the second electromagnetic valve 14 is closed, negative pressure is supplied only to the input chamber 6 via the input passage 6a, and the main valve body 12 is seated.
Thereafter, the second electromagnetic valve 14 is opened, and the negative pressure of the intake source 2 is supplied to the vacuum pack 3a through the suction passage Pa. The flow rate of the negative pressure through the suction passage Pa is that of the vacuum pack 3a. The flow rate is set so that the internal powder does not rise.
On the other hand, the electromagnetic valve 10 in the branch pipe P1 is closed, and no negative pressure is supplied to the main valve opening / closing chamber 8, so that the main valve body 12 remains in a seated state.
Therefore, only the negative pressure from the suction passage Pa is supplied to the vacuum pack 3a, so that the powder does not rise.

Thereafter, when the vacuum pack 3a reaches a predetermined negative pressure that does not cause the powder to rise, this is detected by a pressure sensor or the like provided in the output chamber 7, and the electromagnetic valve 10 is activated to pass through the suction pipe P1. Thus, a negative pressure is supplied to the main valve opening / closing chamber 8.
As a result, the diaphragm 12 is displaced, the main valve body 12 is separated from the main valve seat 9, and the negative pressure flowing through the output chamber 7 and the output passage 7a is supplied to the vacuum pack 3a.
In the vacuum pack 3a, since the large flow rate exhaust from the output passage 7a is performed, the vacuum pack 3a can be brought into a vacuum state in a shorter time than when only the suction passage Pa is used.

In the above-described embodiment, the electromagnetic valve 10 is provided in the branch pipe P1 as the negative pressure eliminating means, but other configurations are possible.
For example, the upper housing 5 is formed with an air release passage as negative pressure releasing means communicating with the main valve opening / closing chamber 8, and a throttle valve is provided in the air release passage so that the flow rate of the circulating air can be reduced. By setting the flow rate of the negative pressure flowing through 8a to be sufficiently smaller than the flow rate of the negative pressure, it is possible to make the atmosphere release passage always open to the atmosphere.
Similarly to the above embodiment, when negative pressure is supplied from the intake source 2 to the main valve opening / closing chamber 8, the main valve body 12 is detached from the main valve seat 9 by the suction force on the main valve opening / closing chamber 8 side, and the holding means. 13, a negative pressure can be supplied to the exhausted object 3 from the output chamber 7.
Then, by stopping the supply of negative pressure from the intake source 2 to the main valve opening / closing chamber 8, the negative pressure in the main valve opening / closing chamber 8 is discharged from the atmosphere opening passage, and suction on the main valve opening / closing chamber 8 side is performed. The main valve body 12 can be seated on the main valve seat 9 because the force is reduced and the main valve body 12 held by the holding means 13 is released.

DESCRIPTION OF SYMBOLS 1 Valve apparatus 2 Intake source 3 Exhaust thing 3a Vacuum pack 6 Input chamber 7 Output chamber 8 Main valve opening / closing chamber 8a Branch passage 9 Main valve seat 10 Solenoid valve (negative pressure cancellation means)
DESCRIPTION OF SYMBOLS 11 Diaphragm 12 Main valve body 13 Holding means 14 2nd solenoid valve P piping P1 Branch piping Pa Suction passage

Claims (2)

An input chamber that is supplied with negative pressure from the intake source, an output chamber that is formed adjacent to the input chamber and communicates with the exhausted object, and that is formed on the opposite side of the input chamber and the output chamber across the diaphragm. A main valve opening / closing chamber, a main valve seat formed at a boundary between the input chamber and the output chamber, and a main valve seat provided on the diaphragm and seated on the main valve seat to cut off the input chamber and the output chamber. With a valve body,
When the main valve body seated on the main valve seat is separated from the main valve seat, the input chamber communicates with the output chamber to supply negative pressure to the exhausted object.
A branch passage communicating with the main valve opening / closing chamber and connected to the intake source, a negative pressure canceling means for canceling the negative pressure in the main valve opening / closing chamber, and the main valve seat provided in the main valve opening / closing chamber Holding means for holding the main valve body that is further separated,
When negative pressure is supplied to the main valve opening / closing chamber, the main valve body is separated from the main valve seat by the differential pressure between the main valve opening / closing chamber and the input chamber and the output chamber, and the holding means Holding the main disc,
When the negative pressure canceling means cancels the negative pressure in the main valve opening / closing chamber from this state, the holding means releases the main valve body, and the main valve body is seated on the main valve seat. Valve device to do. A suction passage that connects the intake source and the exhausted object without passing through the input chamber and the output chamber is provided, and a flow rate in the suction passage is made smaller than a flow rate in the input chamber and the output chamber,
When the object to be exhausted communicating with the output chamber reaches a predetermined pressure, the main valve body is seated on the main valve seat to stop the supply of negative pressure from the output chamber to the object to be exhausted. 2. The valve device according to claim 1, wherein a negative pressure is supplied to the exhausted object.

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