JP2001248752A - Solenoid valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that keeping a coolant passage opened by a valve element is undesirable from a point of view of energy conservation because electric power consumption is required for continuous excitation of a magnet coil in a solenoid valve for controlling flow of coolant as fluid in a refrigeration system. SOLUTION: In this solenoid valve comprising an inlet and an outlet of the fluid, the valve element operated by carrying/cutting electric current opens and closes a fluid passage in a valve seat so as to control the flow of the fluid from the inlet to the outlet. A flat spring is applied to the valve element for switching a status between a first status for retaining an opening position of the valve element to the valve seat and a first status for retaining a closing position of the valve element to the valve seat so as to suitable the status for a short time exitation. As a technical means adopted for the exitation to the magnetic coil, the flat spring is suitable for switching from the first status to the second status and from the second status to the first status.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a valve body having a fluid inlet and a fluid outlet, wherein a valve body which operates a fluid flow from the inlet to the outlet by energizing / de-energizing an electromagnetic coil is formed in a valve seat. The present invention relates to an improvement of an electromagnetic valve which is controlled by opening and closing a fluid passage, and an improvement of an electromagnetic valve suitable for controlling a flow of a refrigerant as a fluid in a refrigeration system.

[0002]

2. Description of the Related Art Prior art of a solenoid valve for controlling a flow of a refrigerant as a fluid in a refrigeration system will be described with reference to FIG. Reference numeral 30 denotes the entire solenoid valve, which has the following configuration. Reference numeral 31 denotes a housing of the solenoid valve 30 having an inlet 32 for a refrigerant as a fluid on an upper side surface thereof and an outlet 33 for a refrigerant on a lower surface thereof. Reference numeral 34 denotes an electromagnetic coil provided on the outer surface of the upper wall of the housing 31. Reference numeral 35 denotes a valve seat provided in the housing 31, and a coolant passage 36 penetrates the center of the valve seat. Reference numeral 37 denotes a valve body which moves up and down with respect to the valve seat 35 to open and close the refrigerant passage 36, and a shaft 38 thereof is connected to the refrigerant passage 36.
It extends upward through the inside and has a magnet (permanent magnet) 39 at its upper end. Reference numeral 40 denotes a coil-shaped return spring that constantly biases the valve body 37 in a direction to close the refrigerant passage 36,
One end is located around a shaft 38 of the valve body 37 and one end is a magnet 39.
The other end is provided in a state of contacting the valve seat 35.

In this prior art, the valve element 37 closes the refrigerant passage 36 by the return spring 40 when the electromagnetic coil 34 is not energized. Due to the repulsion of the magnetic force of the electromagnetic coil 34 and the magnetic force of the magnet 39 when the electromagnetic coil 34 is energized, the valve body 37 moves downward against the spring force of the return spring 40, and the valve body 37 opens the refrigerant passage 36. Refrigerant flows from inlet 32 to outlet 33.

[0004]

However, in the prior art described above, maintaining the state in which the valve body 37 opens the refrigerant passage 36 requires that the energization of the electromagnetic coil 34 be continued, and the electric power required for this is maintained. There is consumption, which is not preferable from the viewpoint of energy saving.

Japanese Patent Application Laid-Open No. 9-269079 discloses an electromagnetic valve used for hydraulic control, but this also has a similar problem.

The continuation of energization of the electromagnetic coil 34 also acts to decrease the magnetic force of the magnet (permanent magnet) 39. When the magnetic force of the magnet (permanent magnet) 39 falls below a predetermined value, the normal switching operation of the solenoid valve is performed. There is a possibility that it cannot be obtained.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide an electromagnetic valve having an effect of saving power and suppressing demagnetization of a magnet (permanent magnet). As one specific means, a fluid passage formed in a valve seat having a fluid inlet and a fluid outlet, and a valve body which operates by energizing / de-energizing an electromagnetic coil to flow the fluid from the inlet to the outlet. In a solenoid valve controlled by opening and closing the valve, the state is inverted between a first state in which the valve body holds an open position with respect to the valve seat and a first state in which the valve body holds a closed position with respect to the valve seat. A leaf spring to be applied to the valve body, and energization of the electromagnetic coil is performed so that the leaf spring is inverted from the first state to the second state and from the first state to the second state. Technology by short-time energization suitable for reversing It was adopted.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a valve body having a fluid inlet and a fluid outlet, and having a valve seat that operates by energizing / de-energizing an electromagnetic coil to flow a fluid from the inlet to the outlet. The present invention relates to an improvement of an electromagnetic valve which is controlled by opening and closing a fluid passage, and an improvement of an electromagnetic valve suitable for controlling a flow of a refrigerant as a fluid in a refrigeration system. For this reason, the embodiment of the present invention describes an electromagnetic valve suitable for controlling the flow of a refrigerant as a fluid in a refrigeration system.

FIGS. 1 to 3 show an embodiment of the present invention for an electromagnetic valve suitable for controlling the flow of a refrigerant as a fluid in a refrigeration system. FIG. 1 shows an embodiment of the present invention. FIG. 2 is a cross-sectional view of a state in which the solenoid valve is open, FIG. 2 is a cross-sectional view of a state in which the solenoid valve of the embodiment of the present invention is closed, and FIG. 3 is a piping diagram of a refrigeration system to which the solenoid valve of the embodiment of the present invention is applied. .

1 to 3, reference numeral 1 denotes the entire solenoid valve, which has the following configuration. Reference numeral 2 denotes a housing of the solenoid valve 1 having an inlet 3 for a refrigerant as a fluid on an upper side surface thereof and an outlet 4 for a refrigerant on a lower surface thereof. 5 is the housing 2
Is an electromagnetic coil provided on the outer surface of the upper wall of the above. Reference numeral 6 denotes a valve seat provided in the housing 2, and a fluid (refrigerant) is provided at the center thereof.
The passage 7 is penetrating. Reference numeral 8 denotes a valve body that moves up and down with respect to the valve seat 6 to open and close the refrigerant passage 7, and its shaft 9 extends upward through the refrigerant passage 7 and has a magnet (permanent magnet) 10 at its upper end. . Reference numeral 11 denotes a rectangular leaf spring which urges the valve body 8 to hold the refrigerant passage 7 in a closed state and an open state, and a central portion is supported by a permanent magnet 10 forming a part of the valve body 8. The two pieces of the peripheral portion are supported by the housing 2, and the leaf spring 11 reverses from one state to the other state and from the other state to the one state by an external force. Even when the valve body 8 has disappeared, a spring force acts so that the valve element 8 holds the state in which the refrigerant passage 7 is opened as shown in FIG. 1 and the state in which the refrigerant passage 7 is closed as shown in FIG. .

In such a configuration, the solenoid valve 1 is configured as shown in FIG.
In the state (1), the electromagnetic coil 5 is not energized, and the state in which the refrigerant body 7 is opened by pushing down the valve body 8 by the spring force of the leaf spring 11 is maintained. In this state, the electromagnetic coil 5 is energized and the magnet (permanent magnet) 1
By generating a magnetic force of zero and a magnetic force to be attracted, the permanent magnet 10 is attracted upward and the valve body 8 rises, whereby the leaf spring 11 is deformed in one (upward) convex shape as shown in FIG. . This state is a state in which the valve body 8 closes the refrigerant passage 7, and is maintained even when the electromagnetic coil 5 is not energized. In the state of FIG. 2, the electromagnetic coil 5 is energized again to generate a magnetic force that repels the magnetic force of the magnet (permanent magnet) 10, whereby the permanent magnet 10 moves downward and the valve element 8 descends, thereby The leaf spring 11 is deformed in a convex shape toward the other side (downward) as shown in FIG. This state is a state in which the valve element 8 has opened the refrigerant passage 7, and is maintained even when the electromagnetic coil 5 is not energized.

Reference numeral 12 denotes a detector for detecting whether the valve element 8 opens or closes the refrigerant passage 7, and detects a current or a voltage corresponding to the strength of the magnetic field generated by the permanent magnet 10. This is determined by an electric circuit to determine whether the valve element 8 has opened or closed the refrigerant passage 7. By this determination, the direction of the current flowing through the electromagnetic coil 5 by the electric circuit that supplies the current to the electromagnetic coil 5 is determined, and whether the direction of the magnetic force due to energization of the electromagnetic coil 5 is the direction of attracting the permanent magnet 10 or the direction of repelling it Is determined. The detector 12 is, for example, the permanent magnet 1
It is composed of a coil for detecting a magnetic flux density of 0 or the like. The electrical circuit has a threshold, and upon detection by the detector 12,
It is determined whether the permanent magnet 10 is in the state of FIG. 1 or the state of FIG.

FIG. 3 shows a refrigerant pipe which is one embodiment of a refrigeration system provided with the solenoid valve 1 of the present invention.
3, reference numeral 1 denotes a solenoid valve of the present invention, 14 denotes a compressor, 1
5 is a condenser, 16 is a decompressor, 17 and 18 are evaporators (coolers).
This is a system for controlling the supply of refrigerant to the evaporators 17 and 18.

As described above, the present invention relates to the valve seat 6 of the valve body 8.
The first state of maintaining the open position with respect to the valve seat 6 of the valve body 8
A leaf spring that reverses the state to a second state that holds a closed position with respect to the valve body 8 is applied to the valve body 8, and energization of the electromagnetic coil 5 is performed so that the leaf spring 11 switches from the first state to the second state. This is performed by short-time energization suitable for inversion and inversion from the second state to the first state.

Thus, the energization of the electromagnetic coil 5 is
The time required for switching the valve body 8 becomes short, and power saving can be achieved. In addition, the effect of suppressing the demagnetization of the permanent magnet 10 can be achieved by reducing the power supply to the electromagnetic coil 5. Further, since the leaf spring 11 performs both the position holding and the return operation of the valve element 8, there is no need to add any special parts structurally, and the configuration is simple.

The solenoid valve of the present invention has the same effect when applied to the control of other fluids in addition to the control of the refrigerant in the refrigeration system as described above.

[0017]

According to the first aspect of the present invention, energization of the electromagnetic coil is performed in a short time required for switching the valve body, and power can be saved. In addition, the effect of suppressing the demagnetization of the permanent magnet can be achieved by shortening the energization of the electromagnetic coil. Also, since the valve body can be held at two positions without energizing the electromagnetic coil, when energizing the electromagnetic coil is a continuous energizing method,
Instability of energization causes unstable state retention of the valve.
The problem of being eliminated. Further, since the leaf spring 11 performs both the position holding and the return operation of the valve element 8, there is no need to add any special parts structurally, and the configuration is simple.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state in which an electromagnetic valve according to an embodiment of the present invention is open.

FIG. 2 is a cross-sectional view illustrating a state where an electromagnetic valve according to the embodiment of the present invention is closed.

FIG. 3 is a piping diagram of a refrigeration system to which the solenoid valve according to the embodiment of the present invention is applied.

FIG. 4 is a cross-sectional view showing a state where a solenoid valve according to the prior art is closed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electromagnetic valve 2 ... Housing 3 ... Fluid inlet 4 ... Fluid outlet 5 ... Electromagnetic coil 6 ... Valve seat 7 ... Fluid (refrigerant) passage 8 ... Valve 9 ... Shaft 10 ... Permanent magnet 11 ... leaf spring 12 ... detector

Claims (1)

[Claims] 1. A valve body having a fluid inlet and a fluid outlet, wherein a valve body which operates by energizing / de-energizing an electromagnetic coil to flow a fluid from the inlet to the outlet opens and closes a fluid passage formed in a valve seat. In the electromagnetic valve controlled by the above, a leaf spring inverting between a first state in which the valve body holds an open position with respect to the valve seat and a second state in which the valve body holds a closed position with respect to the valve seat. Is applied to the valve body, and the energization of the electromagnetic coil is performed when the leaf spring is inverted from the first state to the second state and when the first state is switched to the first state from the second state.
Solenoid valve characterized in that it is energized for a short time suitable for reversing to the state described above.