JPH07260035A - Solenoid valve - Google Patents

Abstract

PURPOSE:To obtain an instantaneously electrifying-type solenoid valve having a little operating sound, CONSTITUTION:A first plunger 15 on which a valve 17 is provided is so arranged as to face a valve opening solenoid 28, and a second plunger 26 is so arranged as to face a valve opening solenoid 29, and the valve opening state is held by a position holding device 19 and a stepped part 12. Thereby, instantaneous electrification is enabled by the position holding device 19, and energy saving is attempted, and magnetic contact of the plunger is prevented, so as to obtain silence.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve used for refrigerant control of refrigerators, air conditioners, cold chain devices and the like.

[0002]

2. Description of the Related Art A conventional solenoid valve is disclosed in, for example, Japanese Patent Laid-Open No. 4-79.
The configuration disclosed in the publication is known. Hereinafter, the configuration of the solenoid valve disclosed in Japanese Patent Laid-Open No. 4-79 will be described with reference to FIG.

FIG. 3 is a vertical sectional view showing the structure of a conventional solenoid valve. Such a solenoid valve forms a port 84 in a case 83 having an inlet 80 and an outlet 81, presses the valve body 85 with a bias spring 86 that is constantly biased in a direction to close the port 84, and slides the valve body 85. An electromagnetic coil 88 is arranged on the outer circumference of a freely accommodating tubular body 87.

As is well known, in the solenoid valve described above, when the electromagnetic coil 88 is energized, the valve body 85 made of a magnetic material is attracted to the fixed magnetic pole 89 to open the port 84.

However, in the above-mentioned one, the valve body 85 collides with the fixed magnetic pole 89 at the time of operation to generate an impulsive sound or generate electromagnetic noise during energization.
Especially when it is used for equipment installed in a residential area or a house, measures such as soundproofing and sound insulation are required.

In order to avoid such a problem, as another conventional example, in Japanese Utility Model Laid-Open No. 64-43277, an air gap is formed on the upper end side of a plunger to form a leaky solenoid and an impact noise is generated. It is known to reduce the above.

However, although the above is advantageous for noise reduction, energization at the time of opening the valve is indispensable and the power consumption has not been improved at all.

On the other hand, in Japanese Utility Model Laid-Open No. 58-34281, a single plunger is driven by a solenoid for opening and closing a valve to move a T-shaped valve element up and down and an outward spring. It is shown that the plunger is held in the open and closed positions and the power is supplied only when the valve is switched to reduce the power consumption.

However, in this case, the impact noise between the plunger and the valve body is unavoidable, and no one has satisfied both power consumption and noise.

[0010]

SUMMARY OF THE INVENTION Therefore, the present invention is intended to solve the above-mentioned problems, and an object thereof is to provide a solenoid valve capable of reducing operating noise and power consumption.

It is another object of the present invention to open and close the valve reliably and arbitrarily by selectively energizing the electromagnetic coil.

Further, a device for holding the valve in the open or closed position when the solenoid is energized and then de-energized is provided with a simple structure in which no leak occurs when the valve is closed due to a self-centering action. Is intended.

Another object of the present invention is to provide a structure for alleviating the shock of valve closing operation.

Another object of the present invention is to prevent excessive vibration due to resonance or abnormal acceleration of the plunger, which is apt to occur during driving with an alternating current.

Furthermore, it is an object of the present invention to prevent excessive wear of the valve when it is closed and excessive wear of the valve.

[0016]

To solve the above problems, the present invention provides a case having an inlet passage, an outlet passage and a valve port, and a first plunger provided in the magnetic circuit of a valve opening solenoid. A step portion provided at the beginning of the plunger week of the case, comprising a second plunger provided in the magnetic circuit of the valve closing solenoid, and a valve provided at the first plunger to open and close the valve port. A position holding device for holding the valve in an open or closed position by engaging with the valve, and after energizing the valve opening solenoid and the valve closing solenoid for a short time, the energization is cut off, Is held in the open and closed positions.

In a preferred embodiment of the present invention, the position holding device is characterized by having at least one pair of balls and a compression spring interposed between the balls.

Still another aspect of the present invention is a case having an inlet passage, an outlet passage and a valve port, a first plunger provided in a magnetic circuit of a valve opening solenoid, and a magnetic circuit of a valve closing solenoid. A second plunger provided on the first plunger and a valve for opening and closing the valve port provided on the first plunger, and by engaging a step portion provided at the beginning of the plunger week of the case, the valve A position holding device for holding the valve at the valve opening or closing position,
A second balance spring is provided between the plunger and the case, and the second balance spring presses the first plunger in the valve closing direction when the position holding device is on the valve closing side. .

Still another aspect of the present invention is a case having an inlet passage, an outlet passage and a valve port, a first plunger provided in a magnetic circuit of a valve opening solenoid, and a magnetic circuit of a valve closing solenoid. A second plunger provided inside and a valve for opening and closing the valve port provided in the first plunger, and by engaging with a step provided at the beginning of the plunger week of the case, A second plunger having a position holding device for holding the valve in an open or closed position, the position holding device being fixed to the first plunger and separated from the second plunger; A second balance spring is provided between the case and the case.

A preferred embodiment is characterized in that a first balance spring is provided between the second plunger and the case.

[0021]

In the solenoid valve according to the present invention, the energization of the closing solenoid energizes the second plunger to generate a downward thrust, and by pushing the first plunger, the position holding device moves the step portion of the case. Overcome and valve closes valve port. After that, even when the valve closing solenoid is de-energized, it remains closed. Conversely, when the valve-opening solenoid is energized, the first plunger is excited to generate upward thrust, the position holding device passes through the stepped portion of the case, the valve is opened, and the first plunger is raised. It is kept as it is.

Further, in the position holding device, since the pole is pressed outward by the spring at the step, the pair of balls engage the step and the centering action of the position holding device and the first plunger is performed. , Improve the sealing performance of the valve.

Further, when the second balance spring is provided,
When the position holding device has passed the step and is on the valve closing side, the first plunger is biased in the valve closing direction via the second plunger to ensure the valve opening operation. In addition, since the second plunger compresses the second balance spring during the valve opening operation, excessive vibration is absorbed.

Furthermore, especially when driven by an AC power supply, due to matching of the instantaneous position of the stroke of the plunger and the phase of the AC waveform, an excessive force acts on the plunger in an unnecessary direction, a so-called abnormal condition. Acceleration tends to occur, but by separating the second plunger and the first plunger, when the first plunger is subjected to abnormal acceleration, the force of the second plunger and the second balance spring causes the first plan to move. It can move differently from the jar, absorbs the kinetic energy of the first plunger, and suppresses excessive vibration of the first plunger.

Further, the adoption of the first balance spring prevents the valve from being pressed against the valve port with an unnecessarily large force during the valve closing operation.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A solenoid valve according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a vertical sectional view of a solenoid valve according to an embodiment of the present invention, and is a sectional view of a main part in the same embodiment.

The solenoid valve 1 is made of a non-magnetic material such as brass, stainless steel or the like, which integrally has an inlet passage 2, an outlet passage 3, a valve port 4 connected to the outlet passage 3, and a plunger housing portion 5. It has a case 6. An electromagnetic coil 7 is provided on the outside of the plunger housing 5 with a clamp 8 and a screw 9.
It is fixed by.

On the inner wall of the plunger accommodating portion 5, a small-diameter portion 10 on the valve port side and a large-diameter portion 11 on the opposite side are formed as the stepped portion 1.
The diameter difference is preferably about 0.5 to 1 mm, and the taper of the stepped portion 12 is preferably 4
It is about 30 ° to 60 ° around 5 °. Reference numeral 13 is a plug that closes the opening of the plunger housing 5, and a screw hole 14 made of a non-magnetic material is formed, and is hermetically fixed by well-known brazing, welding or the like.

Reference numeral 15 is a first plunger made of a magnetic material, in which the tip is on the needle and the large diameter portion 16 is at the rear end.
A valve 17 made of ethylene tetrafluoride or the like is preferably slidably accommodated. A valve spring 18 always urges the valve 17 in a direction to close the valve port 4. Reference numeral 19 denotes a position holding device formed of a non-magnetic material such as brass, and the boss portion 20 is press-fitted and fixed to the upper end of the first plunger 15 to form a gas bend hole 21 extending in the axial direction and a through hole 22 extending in the radial direction. I am doing it. A pair of balls 23 and a compression spring 24 interposed between the balls 23 are housed in the through hole 22, and the balls 23 are always biased outward. On the other hand, a first balance spring 25, which is a compression spring, is provided between the cases 6 at the lower end of the first plunger 15.

Reference numeral 26 is a hollow second plunger made of a magnetic material, and a second balance spring 27 composed of a compression spring is provided between the upper end of the second plunger and the plug 13.

Further, the first and second plungers 1 are
Communication grooves having a U-shaped cross section, which are not disclosed, are formed on the outer peripheral surfaces of 5, 16 so as to communicate the upper and lower ends. This communication passage prevents the movement of the plunger from becoming immobile or slowing due to hydraulic pressure when the inside of the valve is in a liquid-sealed state.

A similar communicating groove is formed in the large-diameter portion 16 of the valve 17 although not disclosed. Next, the electromagnetic coil 7 that drives the plunger will be described.

Reference numeral 28 is a valve opening solenoid for driving the first plunger 15, and 29 is a valve closing solenoid for driving the second plunger 25. 30 and 31 are bobbins of the solenoids 26 and 27, 32, 33, 34 and 35 are magnetic poles of the solenoids, and the magnetic pole 32 also serves as a yoke.

Next, the operation of the above-described embodiment will be described. When opening the valve 17, the valve-opening solenoid 28 is energized for, for example, about 0.1 second. Then, the first plunger 15 receives a magnetic force upward so that its upper and lower ends are aligned with the end faces of the magnetic poles 32 and 33, the ball 23 of the position holding device 19 passes through the step portion 12, and the plunger storage portion 5
Is moved to the large diameter portion 11 side and is driven to a position slightly above the step portion 12. Then, when the energization of the valve opening solenoid 28 is cut off, the ball 23 descends to the step portion 12 and stops due to the force of the second balance spring 27, and the valve 17 is maintained in the open state.

Next, when closing the valve 17, the valve closing solenoid 29 is energized for, for example, about 0.1 second. Then, the second plunger 26 receives a downward magnetic force, and the ball 23
Is compressed against the force of the compression spring 24, gets over the step 12, and is driven to a position where the central position of the second plunger 26 and the magnet center of the valve closing solenoid 29 are aligned. Preferably, over the step 12, 0.5 to 1 mm
It is a place where it has descended to some extent. When the power supply is cut off, the force of the second balance spring 27 causes the first and second plungers 15 and 26 to descend, gently closing the valve 17. At this time, the ball 23 is pressed against the inner curved surface of the plunger housing portion 5 by the force of the compression spring 24,
It is self-centering.

Next, the state in which the solenoids 28 and 29 are driven by alternating current will be described.

When alternating current is energized at random phase angles of its waveform, sometimes the plunger is accelerated more than necessary. This occurs due to the relationship between the phase angle, the direction of movement of the plunger, and the acceleration. When such excessive acceleration occurs, the first and second plungers 15, 26
Are separated, and the first and second balance springs 25,
Since 27 is provided, the first and second plunger vibrations cause a phase shift, the excessive kinetic energy of one plunger is absorbed by the other plunger, and excessive acceleration is prevented.

The first balance spring absorbs this energy when the second plunger 26 descends due to excessive force and when the descending speed of the first plunger 15 increases.

Therefore, in the above-mentioned embodiment, the simple position holding device 19 and the stepped portion can be constructed inexpensively and simply, and the reliable opening can be maintained and the energy can be saved by the instantaneous energization.

Further, the position holding device 19 having the gas vent hole 21 is easy to manufacture because it can be press-fitted and fixed to the first plunger 15, and the valve 17 does not malfunction due to the difference in atmospheric pressure or the difference in hydraulic pressure. .

Further, during the opening operation, the first plunger 15 is temporarily
Is driven upward beyond the step portion 12 to stop contact with the step portion by the force of the second balance spring 27, and when the closing operation is performed, the step portion 1
Since the valve port 4 is closed by the force of the second balance spring 27, the valve 17 is driven to a position slightly above 2.
Does not exert an excessive force on the valve 17, improving the durability of the valve 17,
There is no deterioration of the seal.

Further, the first and second plungers 15, 26
By separating the, it is possible to absorb the abnormal acceleration that tends to occur during AC driving, and it is possible to reduce the noise without generating impact noise.
It is also advantageous in terms of application cost because there is no need to convert to direct current at the time of application. However, there is no problem in operation even if this valve is driven by direct current.

[0044]

As described above, the present invention can satisfy both the power consumption and the noise of the conventional solenoid valve. Further, since the structure is simple and the position holding device has self-centering property, the sealing property is good. Further, the shock of the closing operation of the valve can be alleviated, and the durability of the valve is improved. Also,
Applicability is good because excessive vibration that tends to occur during AC driving can be prevented and abnormal noise and impact noise can be prevented. Further, even in the case of such abnormal vibration, the first balance spring can prevent excessive impact of the valve.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a solenoid valve according to an embodiment of the present invention.

FIG. 2 is a sectional view of an essential part of a solenoid valve in the same embodiment.

FIG. 3 is a vertical sectional view of a conventional solenoid valve.

[Explanation of symbols]

 1 Solenoid Valve 2 Inlet Passage 3 Outlet Passage 4 Valve Port 5 Plunger Storage 5 Case 12 Step 15 First Plunger 17 Valve 19 Position Holding Device 23 Ball 24 Compression Spring 25 First Balance Spring 26 Second Plunger 27th 2 Balance spring 28 Solenoid for valve opening 29 Solenoid for valve closing

Claims (5)

[Claims] 1. A case having an inlet passage, an outlet passage and a valve port, a first plunger provided in a magnetic circuit of a valve opening solenoid, and a second plunger provided in a magnetic circuit of a valve closing solenoid. A plunger and a valve for opening and closing the valve port provided in the first plunger are provided, and the valve is opened or closed by engaging with a step portion provided at the beginning of the plunger week of the case. An electromagnetic device having a position holding device for holding the valve at a valve position, which energizes the valve opening solenoid and the valve closing solenoid for a short time and then interrupts energization to hold the valve at the open / closed position. valve. 2. The solenoid valve according to claim 1, wherein the position holding device has at least one pair of balls and a compression spring interposed between the balls. 3. A case having an inlet passage, an outlet passage and a valve port, a first plunger provided in a magnetic circuit of a valve opening solenoid, and a second plunger provided in a magnetic circuit of a valve closing solenoid. A plunger and a valve for opening and closing the valve port provided in the first plunger are provided, and the valve is opened or closed by engaging with a step portion provided at the beginning of the plunger week of the case. A second balance spring is provided between the second plunger and the case, the second balance spring having a position holding device for holding the valve holding position at the valve position. 1 A solenoid valve characterized by pressing a plunger in a valve closing direction. 4. A case having an inlet passage, an outlet passage and a valve port, a first plunger provided in a magnetic circuit of a valve opening solenoid, and a second plunger provided in a magnetic circuit of a valve closing solenoid. A plunger and a valve for opening and closing the valve port provided in the first plunger are provided, and the valve is opened or closed by engaging with a step portion provided at the beginning of the plunger week of the case. A position holding device for holding the valve in a valve position, the position holding device being fixed to the first plunger and separated from the second plunger, and between the second plunger and the case A solenoid valve having a second balance spring. 5. The solenoid valve according to claim 4, wherein a first balance spring is provided between the second plunger and the case.