JPS61160682A - Valve device - Google Patents

Abstract

PURPOSE:To improve a response characteristic of valve opening action, by equipping a subvalve body, which opens and closes a leak hole drilled in a main valve, to be arranged in a chamber in a high pressure side. CONSTITUTION:If an electromagnetic solenoid 18 is electrified, a shaft 17 is attracted to the side of a core 22 against resilient force of coil spring 35, 36 and differential pressure. Here the shaft 17 first moves downward by a clearance (t), and a subvalve body 15, being detached from a valve seat 29, opens a leak hole 16. As a result, a chamber 28 communicates with a low pressure chamber 12, and a differential pressure applied to a valve body 13 decreases. A contour spread part 31 of the shaft 17 is adapted to a valve guide 27 by decreasing the clearance to zero, and if the shaft 17 continuously moves downward, a main valve body 14 is detached easily from a valve seat 26 by an extent corresponding to a decrease of the differential pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a valve device, and particularly to a valve device suitable for opening and closing a communication portion between two chambers having a differential pressure.

[Background of the Invention] Generally, in a valve device disposed in a communication portion between two chambers having a differential pressure, a valve body is provided in the chamber on the high pressure side. This is because the back pressure of the valve body becomes higher than the pressure on the front low pressure chamber side of the valve body, and this pressure difference can be used as a valve closing force. In other words, the driving force required for the valve body to close the valve can be reduced accordingly, leakage is reduced, and the response of the valve closing operation is faster.

However, on the other hand, installing the valve body in the high pressure side chamber
It becomes necessary to increase the driving force of the valve body required to open the valve.The driving force of the valve body required to overcome this differential pressure and open the valve is large due to the opening area of the communication part that the valve body closes. It gets bigger. Therefore, for example, in the case of a solenoid valve that uses electromagnetic force as its driving force, the current flowing through the electromagnetic solenoid must be increased, which has the disadvantage of having to use a heavy, large-capacity solenoid. Moreover, since the differential pressure acts as a valve closing force, there is also the disadvantage that the response of the valve opening operation becomes poor.

Therefore, in a valve device that requires a quick valve opening operation, the valve body is disposed in a chamber on the low pressure side. However, contrary to the above, such a valve device suffers from a disadvantage when closing the valve because the differential pressure acts as a valve opening force.

Therefore, a large driving force for the valve body is also required.

As a valve device that requires only a small driving force, there is one in which the pressure applied to the front surface of the valve body and the back pressure are the same pressure.

For example, a bellows may be disposed as a valve body in a low pressure chamber so that the inside of the bellows and the high pressure chamber communicate with each other when the valve is closed. However, such a valve device takes advantage of the differential pressure that exists. Furthermore, when the driving force is the same, there is a disadvantage that the responsiveness of the valve closing operation and the leakage are inferior to a valve device that uses differential pressure as the valve closing force.

[Object of the Invention] An object of the present invention is to provide a valve device in which a valve body for opening and closing a communication portion between two chambers having a differential pressure is disposed in a high-pressure chamber, and the differential pressure is used as a valve-closing force. It is an object of the present invention to provide a valve device which solves the above-mentioned problems of the prior art, requires less driving force for the valve body, and has good responsiveness in opening the valve.

[Means for Achieving Object 1] In the present invention, in order to achieve the above object, the valve body has a double structure. That is, the valve device includes a main valve body that opens and closes the communication portion;
A leak hole having an area smaller than the opening area of the communication portion bored in the main valve body, a sub-valve body disposed in the high-pressure side chamber that opens and closes the leak hole, and the sub-valve body being separated from the seat. The valve body is configured to include a shaft that opens the leak hole and then releases the main valve body to open the communication portion, and a drive means that drives the shaft.

In this specification, the terms "high pressure" and "low pressure" are used to represent the relative pressures of two chambers having a differential pressure.

[Operation] The valve device of the present invention having the above configuration performs the valve opening operation in two steps. That is, the shaft is driven, the auxiliary valve body is unseated, the leak hole is opened, and the shaft is continuously opened. is driven, the main valve body is unseated, and the communication portion is opened.

Since the opening area of the leak hole is small, the force required to open the sub-valve body that closes the leak hole is small. When the leak hole opens, high pressure fluid in the high pressure chamber leaks to the front surface of the valve body on the low pressure chamber side through the leak hole. As a result, the differential pressure applied to the main valve element is weakened, and the main valve element opens easily.

Therefore, the driving force required to open the communication portion is small, and the responsiveness of the valve opening operation is improved. Also,
When the valve is closed, differential pressure is applied to the main and sub-valve elements as a valve-closing force, so the responsiveness and leakage characteristics of the valve-closing operation are as good as in the prior art.

[Embodiment 1 of the Invention Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 4. However, among the dimensions, materials, shapes, arrangements, coupling methods, etc. of the component parts described or illustrated in the following description of the embodiments, there are some differences other than the gist of the present invention as set forth in claim 1. It goes without saying that these are not intended to limit the invention to these, but are merely illustrative examples.

FIG. 1 is a sectional view of the solenoid valve. In FIG. 1, the electromagnetic valve lO according to the present embodiment includes a high pressure chamber 11 that communicates with, for example, the atmosphere, and a low pressure chamber 1 that communicates with, for example, an intake pipe of an internal combustion engine.
It is arranged in the communication part with 2. A valve body 13 disposed in the high pressure chamber 11 includes a main valve body 14 that opens and closes the communication portion, and
It is composed of a sub-valve body 15 that opens and closes a leak hole 16 formed in the main valve body 14. The shaft 17, which unseats the sub-valve body 15 to open the leak hole 16 and then unseats the main valve body 14 to open the communication portion, is driven by an electromagnetic solenoid 18.

Electromagnetic solenoid 1 housed in case 19 of electromagnetic valve lO
8 is wound around a coil bobbin 20. A core 21 is fitted and fixed into the center hole of the coil bobbin 20, and an adjustment screw 22 is screwed into the bottom of the core 2I. A ring-shaped yoke 23 that fixes the coil bobbin 20 within the case 19 is screwed into the opening of the case 19 that houses the electromagnetic solenoid 18 and the coil bobbin 20, and a body 24 that forms the high pressure chamber 11 and the low pressure chamber 12 is mounted on top of the ring-shaped yoke 23. is permanently installed.

The main valve body 14 is a cylindrical body with a bottom, and its bottom portion 25 is configured to sit on a ring-shaped valve seat 26 formed in a communicating portion to close the communicating portion. A cylindrical valve guide 27 is integrally fitted into the opening of the main valve body 14 which is a cylinder with a bottom, and a chamber 28 is formed inside the main valve body 14 . A leak hole 16 having an area smaller than the opening area of the valve seat 26 is bored in the bottom 25 of the main valve body 14, and a valve seat 29 for the sub-valve body 15 is provided protruding inside the bottom 25. A through hole 30 is bored in the peripheral wall of the main valve body 14 to form a chamber 28 and a high pressure chamber 1.
1 are in communication with each other.

The shaft 17 has a lower portion slidably inserted into the center hole of the core 21, an upper portion slidably inserted into the center hole of the valve guide 27, and an upper end portion protruding into the chamber 28 of the main valve body 14. 31 is expanded in diameter within the chamber 28, and the expanded diameter portion 3
A sub-valve body 15 is fixed to the distal end surface of the valve body 1 . The dimensions are such that when the sub-valve body 15 is seated on the valve seat 29, a slight clearance t is formed between the lower end surface of the enlarged diameter portion 31 and the upper end surface of the valve guide 27. . A plunger 33 is externally fitted and fixed to the center of the shaft 17.
When the shaft 17 moves downward in FIG. 1, the plunger 33 comes into contact with the upper end of the core 21 to stop the shirt 17.

Furthermore, the flange 3 of the valve guide 27 is located in the high pressure chamber ll.
A spring 35 for biasing the main valve element 14 in the valve-closing direction is installed between the yoke 23 and the yoke 23. Valve body 1
4 and a coil spring 3 that biases the sub-valve body 15 in the valve-closing direction.
6 has been reduced. Note that numerals 37 and 38 indicate O-rings for sealing, and numeral 39 indicates a lead wire connected to the electromagnetic solenoid 1B.

Next, the opening operation of the above-mentioned solenoid valve will be explained using FIGS. 2 and 3.

When the electromagnetic solenoid 18 is not energized, the main valve body 14 is seated on the valve seat 26 due to the differential pressure between the pressure in the high pressure chamber 11 and the pressure in the low pressure chamber 12 and the elastic force of the coil springs 35 and 36. However, the sub-valve body 15 is seated on the valve seat 29.

In this state, the high pressure chamber 11 and the low pressure chamber 12 are completely defined.

When the electromagnetic solenoid 18 is energized, the electromagnetic solenoid 18 is excited, and the shirt 17 is attracted toward the core 22 against the elastic force of the coil springs 35 and 36 and the differential pressure. At this time, just before the main valve body 14 leaves the valve seat 26, first, the shaft 17 moves down by the clearance t and the sub valve body 14 moves downward by the clearance t.
5 is removed from the valve seat 29, and the leak hole 16 opens as shown in FIG. Therefore, the chamber 28 and the low pressure chamber 12 communicate with each other, and the high pressure fluid in the high pressure chamber 11 flows through the through hole 30, the chamber 28.
The leakage occurs to the front surface of the main valve body 14 on the low pressure chamber 12 side through the leak hole 16, and the differential pressure applied to the valve body 13 is weakened. When the clearance t becomes zero and the enlarged diameter part 31 of the shirt 17 comes into contact with the valve guide 27, and the shaft 17 continues to move downward,
As shown in FIG. 3, the main valve body 14 is easily removed from the valve seat 26 as the differential pressure is weakened.

In this way, the sub-valve element 15 is unseated immediately before the main valve element 14 is unseated to weaken the differential pressure applied to the valve element 13, so that the electromagnetic force required to open the main valve element 14 is reduced. In other words, the value of the current can be reduced. Therefore, a small capacity electromagnetic solenoid can be used. In addition, since the clearance E does not need to be large, the valve opening operation of the sub-valve body 15 and the valve-opening operation of the main valve body 14 are performed almost simultaneously, and there is almost no time delay due to the valve opening operation being performed in two stages. None.

Note that the shaft can also be provided on the low pressure chamber side. FIG. 4 is a schematic diagram of the valve device in this case. In FIG. 4, a communication hole 43 is provided in a partition wall 42 that defines a high pressure chamber 40 and a low pressure chamber 41, and a valve seat 44 is provided protruding from the outer periphery of the communication hole 43 on the high pressure chamber 40 side.

The main valve body 45 disposed in the high pressure chamber 40 is a hollow cylindrical body, and the tip 47 of a shaft 46 provided on the low pressure chamber 41 side
is slidably inserted into the main valve body 45 through the communication hole 43.

A through hole 49 is bored in the peripheral wall of the main valve body 45 to communicate the hollow chamber 48 of the main valve body 45 with the high pressure chamber 40, and a leak hole is formed in the bottom part 52 of the main valve body 45 seated on the valve seat 44. 50 are perforated.

A sub-valve body 51 that closes the leak hole 50 is fixed on the back surface of the enlarged tip portion 47 of the shaft 46, and when the sub-valve body 51 closes the leak hole 50, the tip surface of the tip portion 47 and the main valve body 4
A slight clearance t is formed between the end surface of the bottom surface portion on the side opposite to the shaft 46 of No. 5. Further, the shaft 46 is driven by a driving means (not shown), such as an electromagnetic solenoid, a piston, or human power such as pedal force.

With this configuration, first, when the shaft 46 moves downward and presses the sub-valve body 5, the leak hole 50 opens and the high pressure chamber 40
The high pressure fluid in the through hole 49. Hollow chamber 48. Leak hole 50
leaks to the low pressure chamber 41 through the pressure, and the differential pressure applied to the main valve body 45 weakens. Further, the shaft 46 moves down and the main valve body 45
When pressed, the main valve body 45 easily slides into the valve seat 4 in the same way as described above.
4, and the communication hole 43 opens.

[Effects of the Invention] As described above, in the present invention, since the valve body has a double structure, the driving force required when opening the valve is small, and the valve opening operation can be performed reliably and quickly. can. Since only a small driving force is required, a small and lightweight driving means can be used, which is advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a solenoid valve according to an embodiment of the present invention, and FIG.
3 and 3 are explanatory diagrams of the operation of the solenoid valve shown in FIG.
The figure is a schematic diagram of the second embodiment. 10... Solenoid valve, 11.40... High pressure chamber, 12.4
1...Low pressure chamber, 14.45...Main valve body, 15.51
...Sub-valve body, 16.50...Leak hole, 17, 4
6...Shaft. 18...Electromagnetic solenoid, t...Clearance.

Claims (1)

[Scope of Claims] 1. A valve that is provided in a communication section between two chambers having a differential pressure, and a valve body that opens and closes the communication section is disposed in the high-pressure side chamber, and uses the differential pressure as a valve-closing force. In the device, a main valve body that opens and closes the communication portion, a leak hole having a smaller area than the opening area of the communication portion bored in the main valve body, and a leak hole provided on the high pressure chamber side that opens and closes the leak hole. A sub-valve body, a shaft for unseating the main valve body to open the communication portion after the sub-valve body is unseated to open the leak hole, and a drive means for driving the shaft. Features a valve device. 2. The valve device according to claim 1, wherein the driving means is an electromagnetic solenoid. 3. The shaft is disposed on the high pressure chamber side and pushes the main valve body and the auxiliary valve body toward the low pressure chamber side to close the communication portion and the leak hole, respectively. The valve device according to scope 1 or 2. 4. The shaft is disposed on the low pressure chamber side and pushes the main valve body and the sub valve body toward the high pressure chamber side to open the communication portion and the leak hole, respectively. The valve device according to scope 1 or 2.