JP2002295715A - Fluid control valve - Google Patents

Abstract

(57) [Problem] To achieve energy saving and low cost in a fluid control valve such as a flow path switching valve of an air conditioner. SOLUTION: A flow path switching valve (fluid control valve) of an air conditioner.
, A switching transistor 406 a is provided between the electromagnetic coil 101 of the pilot solenoid valve and the power supply 10. The switching transistor 406a is an N-channel MOS-FET. The gate voltage of the switching transistor 406a is supplied to the control unit C1 and the signal conversion unit 4
06b. Negative line BL- of supply power 10
Is connected to 0V of the control unit C1, and the signal conversion unit 406b
Eliminates the need for electrical insulation means. In the suction drive step of sucking the plunger of the pilot solenoid valve, the plunger is driven at the rated voltage, and in the holding drive step of holding the plunger, PWM is driven. The voltage is set to 0 V in the plunger detachment driving step.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in an air conditioner comprising a compressor, a flow path switching valve, an outdoor heat exchanger, a throttle device, an indoor heat exchanger, etc., and switches a flow direction of a refrigerant. The present invention relates to a switching valve and a fluid control valve for controlling a flow of a refrigerant.

[0002]

2. Description of the Related Art Conventionally, there are two types of relays that are widely used, such as an AC drive type and a DC drive type. Generally, the operating voltage of the AC drive type is 80% of the rated voltage and the return voltage is 30%, and the operating voltage of the DC drive type is 80% of the rated voltage and the return voltage is 10%.

[0003] In a fluid control valve including an electromagnetic coil and a plunger, although the percent (%) value is different, the DC-driven type tends to exhibit significantly smaller return voltage characteristics than the AC-driven type.

(Prior art-1) Japanese Utility Model Application Laid-Open No. 62-39074
FIG. 1 discloses a four-way valve. In this four-way valve, the four-way valve body and the pilot solenoid valve are connected by three connecting pipes. Since the plunger is provided with a shading ring, it is an AC-driven solenoid valve.

(Prior art-2) JP-A-11-20130
No. 4 discloses a four-way valve in FIG. In this four-way valve, a four-way valve body and a pilot solenoid valve are connected by four connecting pipes. Since the plunger is provided with a shading ring, this is also an AC solenoid valve.

(Prior art-3) JP-A-11-28735
No. 2 discloses a DC-driven solenoid valve in FIG.

FIG. 12 is a block diagram of a driving device for driving a four-way valve according to prior art-1 and prior art-2.
The circuit excluding the full-wave rectifier DB described above causes the electromagnetic coil 11 of the AC-driven solenoid valve to be turned ON / OFF by a relay contact.
OFF ".

If the prior art-3 is constituted by a DC-driven solenoid valve, the circuit including the full-wave rectifier DB shown in FIG. It is configured such that the smoothed DC power is applied by the relay contact and the electromagnetic coil 11 is turned “ON / OFF”.

On the other hand, in the DC-driven solenoid valve disclosed in FIG. 4 of Prior Art-3, the smoothing DC power (supply voltage) shown in FIG. Is configured.

The DC drive latch type solenoid valve disclosed in FIG. 1 of prior art-3 is provided with a permanent magnet 39.

[0011]

In the AC drive system and the full-wave rectification unsmooth DC drive system of the prior art-1 and the prior art-2, after the solenoid valve is operated (adsorbed), the applied voltage is reduced for energy saving. Even if the voltage is set to, for example, 40%, it is practically difficult to switch between the voltage at the time of suction and the voltage at the time of holding because the operation of the relay contact is slow, leaving room for improvement in energy saving.

[0012] Further, when the prior art-1 and the prior art-2 are used in a DC drive type, a converter for generating DC power to be supplied to the solenoid valve is required. The efficiency of the converter unit, whether it is a transformer type or a switching type, is in the range of 60 to 75%, and there is an energy loss of approximately 30%. In this regard, there is room for improvement.

In the prior art-3, energy saving can be achieved by applying a drive current at the time of operation and at the time of return, and thereafter turning off the current. However, since a permanent magnet is provided, a bipolar drive circuit is provided. Need more components,
This leads to higher costs, leaving room for improvement in this regard.

According to the present invention, in order to solve the above-mentioned problems, a supply voltage of a DC power supply is supplied to an electromagnetic coil such as a four-way valve or an electromagnetic valve constituted by a unifier winding, and a control unit performs an adsorption driving step; It is an object of the present invention to provide a fluid control valve which includes a holding drive step and a detachment drive step, drives the connection switching means by PWM, saves energy, and has a further inexpensive configuration.

[0015]

According to a first aspect of the present invention, there is provided a fluid control valve including an electromagnetic coil driven by application of DC power, a plunger, and a suction element for attracting the plunger, and driving the electromagnetic coil. A fluid control valve for controlling the fluid by adsorbing, holding and releasing the plunger with respect to the suction element, wherein the electromagnetic coil is applied with a first predetermined current, and the suction element causes the plunger to operate. Adsorb,
A second predetermined current smaller than the first predetermined current is applied, the suction element holds the plunger in the suction state, and the plunger is detached from the suction element when the current is applied to 0. Features.

According to a second aspect of the present invention, there is provided a fluid control valve having the configuration according to the first aspect, wherein the electromagnetic coil is a unifilar winding, and the electromagnetic coil is driven by a semiconductor type unipolar drive type connection switching means. It is characterized by that.

According to a third aspect of the present invention, there is provided a fluid control valve according to the first or second aspect, wherein the supply voltage of the DC power supplied to the connection switching means for applying a current to the electromagnetic coil is controlled by the electromagnetic coil. In the case of the rated voltage of
It is characterized in that the suction element is capable of holding the suction of the plunger by the PWM drive.

According to a fourth aspect of the present invention, there is provided a fluid control valve according to the first or second aspect, wherein the supply voltage of the DC power supplied to the connection switching means for applying a current to the electromagnetic coil is controlled by the electromagnetic coil. When the voltage is higher than the rated voltage, the electromagnetic coil is configured to be able to attract the plunger to the suction element by PWM driving and to maintain the suction.

A fluid control valve according to a fifth aspect of the present invention has the configuration according to the fourth aspect, wherein the rated voltage of the electromagnetic coil is DC14.
When the supply voltage is 0 V and the supply voltage supplied to the connection switching means is DC 280 V, the plunger can be attracted to the suction element by PWM driving with a duty ratio of 50%.

According to the fluid control valve of the first aspect, when the control unit of the drive unit drives the DC-driven solenoid valve, the suction drive step is performed with, for example, a rated current as the first predetermined current, so that the fluid control is reliably performed. Since the valve operates and is a direct current type, it is driven with a current smaller than the rated current to reliably hold the suction in the holding and driving step, and to return to a certain level if the driving current is set to 0 in the separation driving step.

According to the fluid control valve of the second aspect, the first aspect is provided.
The same operation and effect as described above can be obtained, and the electromagnetic coil of the fluid control valve is formed in a unifilar winding, and the connection switching means for driving the coil is a semiconductor type unipolar drive type. In addition, the holding drive step and the detachment drive step can be easily performed, and the drive voltage can be generated by applying the supply voltage to the electromagnetic coil.

According to the fluid control valve driving device of the third aspect, the same operation and effect as those of the first or second aspect can be obtained, and the energy-saving PWM driving type can be realized with the same hardware configuration as the DC driving type. If the driving current during PWM driving is approximately 1/3, the power consumption is approximately 1/10 of the rated power, and if the driving current is 1/10, the power consumption is approximately 1/100 of the rated power.

According to the fluid control valve of claim 4, claim 1 is provided.
Or the same operation and effect as those of 2 are obtained, and since the supply voltage is higher than the rated voltage of the electromagnetic coil, the driving (average) current is controlled to a predetermined driving current required in the suction driving step and the holding driving step by PWM driving. it can. In addition, PWM
In the case of driving, it goes without saying that the first predetermined current, the rated current, and the second predetermined current are average currents. This is the same in the following description.

According to the fluid control valve of claim 5, according to claim 4,
The same operation and effect as those described above can be obtained.
In the inverter type air conditioner, the supply voltage is DC28
Since the voltage is 0 V, the suction driving step can be performed by performing PWM driving with the duty ratio being 50%. Even if the value of the rated voltage and the value of the supply voltage of the electromagnetic coil are different, the duty ratio can be arbitrarily selected, and it is needless to say that the same operation and effect can be obtained.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fluid control valve according to the present invention will be described below with reference to the drawings. FIG. 5 is a principle block diagram of an air conditioner to which the fluid control valve of the embodiment is applied. In the refrigerating cycle A, 4 is a compressor, 9A is an indoor heat exchanger mounted on an indoor unit, 9B is an outdoor heat exchanger mounted on an outdoor unit, 10A is a throttling device, 20A
0 is an accumulator, 100 is a flow path switching valve (four-way valve) described later.

The discharge port of the compressor 4 is connected to the flow path switching valve 100, and the suction port of the compressor 4 is connected to the flow path switching valve 100 via the accumulator 200. The flow path switching valve 100 is connected to the indoor heat exchanger 9A through a heat exchanger conduit.
And an outdoor heat exchanger 9B, and the expansion device 10A is interposed between the indoor heat exchanger 9A and the outdoor heat exchanger 9B. Thereby, the compressor 4, the flow path switching valve 100, the accumulator 200, the indoor heat exchanger 9A, the outdoor heat exchanger 9
B and the expansion device 10A constitute a refrigeration cycle A.

The compressor 4 compresses the refrigerant, and the compressed refrigerant flows into the flow path switching valve 100. The flow path of the refrigerant is switched by the flow path switching valve 100 according to the operation mode. In the heating mode, the compressed refrigerant flows into the indoor heat exchanger 9A from the flow path switching valve 100 as shown by the solid arrow in the figure, and the indoor heat exchanger 9A functions as a condenser, The refrigerant liquid flowing out of the exchanger 9A flows into the outdoor heat exchanger 9B via the expansion device 10A,
This outdoor heat exchanger 9B functions as an evaporator. The refrigerant evaporated in the outdoor heat exchanger 9B is supplied to the flow path switching valve 1
00 and the compressor 4 via the accumulator 200.

On the other hand, in the cooling operation mode, the refrigerant compressed by the compressor 4 is supplied from the flow path switching valve 100 to the outdoor heat exchanger 9B, the expansion device 10A, and the indoor heat exchanger as indicated by the broken arrows in the figure. 9A, flow path switching valve 100, accumulator 2
Then, the refrigerant is circulated in the order of the compressor 4, the outdoor heat exchanger 9B functions as a condenser, and the indoor heat exchanger 9A functions as an evaporator.

The control device C indicated by a dashed line in FIG. 5 corresponds to the indoor control unit of the indoor unit, the outdoor control unit of the outdoor unit, and the driving device (for the fluid control valve of the present invention).
The processing unit C1 of the control device C is constituted by a microcomputer. The input unit C2 corresponds to a remote control receiving unit or a manual switch of the indoor unit, and the detecting unit C3 includes various temperature sensors (temperature detecting means) or pressure detecting means.
It corresponds to a flow rate detecting means, a frequency detecting means, and the like. Further, the power failure detection unit C4 corresponds to the voltage detector of the outdoor control unit, and the semi-fixed storage unit C5 corresponds to the EEPROM of the indoor control unit and the outdoor control unit.

The expansion device driving section C6, the indoor heat exchanger driving section C7, the outdoor heat exchanger driving section C8, and the compressor driving section C9.
Is a unit that functions by executing a control program described below. In addition, the flow path switching valve driving unit 406 includes the flow path switching valve 1
It corresponds to a driver that drives the 00 electromagnetic coil.

The diaphragm driving unit C6 outputs a control signal to a diaphragm driving source (for example, a stepping motor) 404, and controls the aperture of the diaphragm 10A via the diaphragm driving source 404. The indoor heat exchanger driving unit C7 outputs a control signal to an indoor heat exchanger driving source (for example, a driver of a fan motor), and the indoor heat exchanger driving source 301 drives a cross flow fan according to the control signal to operate. Alternatively, while stopping, the heat exchange capacity of the indoor heat exchanger 9A is controlled by the rotation speed. The outdoor heat exchanger driving unit C8 outputs a control signal to an outdoor heat exchanger driving source (for example, a driver of a fan motor), and the outdoor heat exchanger driving source 401 drives a fan according to the control signal, and operates or stops. At the same time, the heat exchange capacity of the outdoor heat exchanger 9B is controlled by the rotation speed.

The processing section C1 includes a flow path switching valve driving section 40.
6, a flow path switching valve drive unit 406 outputs a flow path switching valve driving source (an electromagnetic coil to be described later) 1 for switching the flow path of the flow path switching valve 100 in accordance with the control signal.
01 is powered. Further, the compressor driving unit C9 outputs a control signal to a compressor power source (for example, an inverter module and a motor) 450, and the compressor power source 450 drives the compressor 4, and the compressor 4 rotates forward and reverse. Rotation, starting,
Stop, ability switching, etc. are controlled.

FIG. 6 is a block diagram mainly showing an electric system of the indoor control section 300 of the indoor unit and the outdoor control section 400 of the outdoor unit. The indoor control unit 300 turns on the main power supply /
A power relay 310 that is turned off is built in, and a single-phase alternating current such as 100 V
The DC voltage is supplied to the DC converter 320 and is converted into various predetermined DC voltages by the AC / DC converter 320.
30 and so on. The microcomputer 330 has an EEP
The ROM 340 is connected. Power relay 3
The 100 V single-phase alternating current supplied via the power supply 10 is also supplied to the outdoor control unit 400 via the power supply lines 220 and 221.

In the outdoor control section 400, the supplied AC is applied to a noise filter 410, then rectified by a converter 420 and smoothed by a smoothing capacitor 430 to generate a predetermined DC voltage. The generated DC current is supplied to the inverter module 450 via the shunt resistor 440.
Supplied to Then, three-phase power is generated by the inverter module 450 and supplied to the compressor 4. In addition,
The shunt resistor 440 is a load current detecting unit of the compressor 4. Although the drive current detecting means of the fluid control valve is omitted, it goes without saying that the present invention can be implemented with a similar configuration.

On the other hand, the output of the smoothing capacitor 430 is DC
The DC voltage is converted into a predetermined internal DC voltage by the / DC converter 460 and supplied to the microcomputer 470 and the like. Then, the microcomputer 470 controls the operation of the compressor 4 by outputting a drive signal to the inverter module 450.
The microcomputer 470 is connected to an EEPROM 480 and a voltage detector 490.
In 80, the position data of the switching position of the main valve body of the flow path switching valve 100 according to the operation mode is stored. Further, the microcomputer 470 performs serial communication with the microcomputer 330 of the indoor control unit 300 via the communication line 210 to exchange data.

FIG. 10 is a view showing an example of the flow path switching valve 100 according to the embodiment. The flow path switching valve 100 includes a four-way valve body 110 and a pilot solenoid valve 120. The four-way valve main body 110 includes a cylindrical valve main body 11, and a high pressure side joint pipe 5 connected to a discharge port of the compressor 4 is provided on an outer periphery thereof.
Are connected. Further, at a position half-circumferentially separated from the joint pipe 5 of the valve body 11, a low-pressure side joint pipe 6 connected to the accumulator 200, two indoor and outdoor heat exchangers 9A, 9
Joint pipes 7 and 8 connected to B are connected respectively.
The three joint pipes 6, 7, 8 are connected to a valve seat 12 inside the valve body 11. In the valve body 11, a first piston 14 and a second piston 15 connected by a connecting rod 13 are provided.
The piston 1 is provided in the valve body 11.
The high pressure chamber R1, the pressure conversion chamber R2, and the pressure conversion chamber R3 are defined by 4,15. Further, a slide valve 16 closely attached to the valve seat 12 is attached to the connecting rod 13. Plugs 17 and 18 are provided at both ends of the valve body 11.
Are fixed by welding.

On the other hand, the pilot solenoid valve 120 has a valve housing 22 attached to one end of a plunger tube 21 and a suction element 23 attached to the other end of the plunger tube 21.
Are mounted, and an electromagnetic coil 101 wound in a unifilar is disposed around it. A plunger 24 is housed in the plunger tube 21, a plunger rod 24 a is connected to a tip of the plunger 24, and a slide valve 25 is attached to an end of the plunger rod 24 a. The plunger 24 is moved by the plunger spring 26 to the valve housing 2.
It is biased to two sides. Valve chamber 22 in valve housing 22
a is connected to a conduction path 31 that is connected to the high-pressure side joint pipe 5 of the four-way valve body 110, and to the other side of the valve chamber 22a, a conduction path 32 that is connected to the low-pressure side connection pipe 6 and a pressure converter. The conduction path 33 conducted to the chamber R2 and the conduction path 34 conducted to the pressure conversion chamber R3 are communicated in parallel. The conduction paths 32, 33, 34 are connected to a valve seat 27 facing the valve chamber 22a.

With the above configuration, the pilot solenoid valve 12
The zero and four-way valve body 110 operates as follows. FIG.
Is a state when power is not supplied to the electromagnetic coil 101, the slide valve 25 is on the left side in FIG. 10 by the urging force of the plunger spring 26, and the pressure conversion chamber R2 is
The pressure conversion chamber R3 is connected to the low-pressure side joint pipe 6 through the connection path 33, the inner cavity of the slide valve 25, and the connection path 32.
The connection is made to the high-pressure side joint pipe 5 via the connection path 34, the valve chamber 22 a, and the connection path 31. Therefore, the pressure conversion chamber R3
Is higher than the internal pressure of the pressure conversion chamber R2, and the pistons 14, 15 and the slide valve 16 are maintained in the state shown in FIG. As a result, the low-pressure joint pipe 6 is communicated with the joint pipe 7 via the bore of the slide valve 16, and the high-pressure joint pipe 5 is communicated with the joint pipe 8 via the high-pressure chamber R1.

On the other hand, when the electromagnetic coil 101 is energized, the plunger 24 is attracted to the suction element 23 against the urging force of the plunger spring 26, and the slide valve 25 moves rightward from the position shown in FIG. I do. Thereby, the pressure conversion chamber R2 is connected to the conduction path 33, the valve chamber 22a, and the conduction path 31.
Through the high pressure side joint pipe 5 through the pressure conversion chamber R3.
Are the conduit 34, the lumen of the slide valve 25, and the conduit 3
2 and to the low pressure side joint pipe 6. Therefore,
The internal pressure of the pressure conversion chamber R2 becomes higher than the internal pressure of the pressure conversion chamber R3, and the pistons 14, 15 and the slide valve 16 are moved rightward from the position in FIG. As a result, the high-pressure joint pipe 5 is communicated with the joint pipe 7 via the high-pressure chamber R1, and the low-pressure joint pipe 6 is communicated with the joint pipe 8 via the bore of the slide valve 16. When the power supply to the electromagnetic coil 101 is stopped, the state returns to the state shown in FIG.

As described above, the operation mode is switched by controlling the energization / de-energization of the electromagnetic coil 101 of the pilot solenoid valve 120. In this embodiment, the joint pipe 7 is connected to the indoor heat exchanger 9A, and the joint pipe 8 is connected to the outdoor heat exchanger 9B, and energizes the electromagnetic coil 101 in the heating mode.

FIG. 1 is a block diagram of a driving device applied to the fluid control valve of the present invention.
The DC power generated by the C converter or the like is transferred to the positive line BL +
And the electromagnetic coil 1 through the connection switching means (flow path switching valve drive unit) 406 by the negative line (negative power supply) BL-.
01. The connection switching means 406 is connected to the control unit C1.
, And energization / de-energization of DC power is performed.

FIG. 2 is an explanatory diagram of a drive sequence in the case where the supply voltage from the supply power 10 is the rated voltage. When the mode is switched to the heating mode, the electromagnetic coil 101 is initially set as a "suction drive step", for example. The rated voltage is applied for 5 seconds, and the plunger 24 of the pilot solenoid valve 120 is attracted to the suction element 23 to switch to the heating mode. Thereafter, during the heating mode, a PWM drive that repeats energization and non-energization at a cycle of approximately 1 millisecond is performed as a “holding driving process”,
The state in which the plunger 24 is attracted to the suction element 23 is maintained. Then, when the heating mode ends or when the mode is switched to the cooling mode, the energization to the electromagnetic coil 101 is cut off (the drive current is set to 0) as a "separation driving step", and the plunger 24 is returned to the state shown in FIG.

FIG. 3 is a circuit diagram showing an example of the connection switching means 406. The connection switching means 406 is composed of a switching transistor 406a and a signal converter 406b. The switching transistor 406a is an N-channel MOS-FE that is turned off when the gate voltage is 0V.
T, which is a semiconductor type unipolar drive type.
The signal conversion unit 406b controls the gate voltage of the MOS-FET 406a by a control signal from the control unit C1, and controls energization / non-energization of the electromagnetic coil 101. As shown by the broken line in the figure, when the negative side line (negative side power supply) BL- of the supply power 10 is connected to 0 V of the control unit C1, the signal conversion unit 406b does not need an electrical insulating unit. In addition, the connection switching means 406 becomes extremely inexpensive.

FIG. 7 is a block diagram of a main part of an air conditioner when the supply voltage generated by the converter is fixed, and shows, for example, an embodiment of a PWM inverter type air conditioner. AC / D
C converter (converter) 421 to PWM inverter 4
While DC 280 V is supplied to the power supply 51, the supply voltage is also supplied to the connection switching means 406, and a drive current is supplied to the electromagnetic coil 101 from the connection switching means 406.

The rated voltage of the electromagnetic coil 101 is DC140
When the voltage is V, the supply voltage (280 V) is higher than the rated voltage, so that the drive is performed according to the drive sequence shown in FIG. For example, this is a driving sequence in the case where 280 V DC (PWM inverter) is supplied to the electromagnetic coil 101 having a rated voltage of 140 V DC. When the mode is switched to the heating mode, the supply voltage is first applied to the electromagnetic coil 101 by PWM driving as a “suction driving step” for 5 seconds, and the plunger 24 of the pilot solenoid valve 120 is attracted to the suction element 23 to perform the heating mode. Switch to. Thereafter, during the heating mode, the PWM drive that repeats energization and non-energization at a cycle of approximately 1 millisecond is performed as a “holding driving process”, and the plunger 2 is driven.
4 is held by the suction element 23. And
At the end of the heating mode or at the time of switching to the cooling mode, the power supply to the electromagnetic coil 101 is cut off and the plunger 24 is returned to the state shown in FIG. As described above, the PWM driving is performed so that the average current at the time of suction becomes the rated current.

FIG. 8 is a block diagram of a main part of an air conditioner when the supply voltage generated by the converter is variable, and shows, for example, an embodiment of a PAM inverter type air conditioner. The DC driving voltage from the variable voltage AC / DC converter (converter) 422 is also supplied to the PAM inverter 452 and the connection switching means 406, and the connection switching means 406 supplies the electromagnetic coil 1
01 is supplied with a drive current. The control unit C1 has a variable voltage A
It detects the voltage of the C / DC converter 422 and outputs a voltage variable signal to control the voltage. At this time, for example, the detection unit C3 determines winter, mid-season and summer from the value of the temperature sensor (temperature detecting means), and corrects and calculates the drive current.

When the supply voltage from the variable voltage AC / DC converter 422 is higher than the rated voltage of the electromagnetic coil 101 and fluctuates (varies), the driving is performed according to the driving sequence shown in FIG. When switching to the heating mode, a rated voltage is first applied to the electromagnetic coil 101 as an “adsorption driving step” for 5 seconds to switch to the heating mode. Thereafter, during the heating mode, as a “holding driving step”, the duty ratio is reduced as the supply voltage becomes higher than the rated voltage, and the PWM drive is performed.
3 is held. Then, when the heating mode ends or the mode is switched to the cooling mode, the energization to the electromagnetic coil 101 is cut off as a “separation driving step”. As described above, PWM driving is performed so that the average current becomes the holding current. When the supply voltage is higher than the rated voltage in the "suction drive process" for 5 seconds, the PW
Drive M.

FIG. 11 shows another embodiment of the fluid control valve. FIG. 11 shows an embodiment of a flow path switching valve having a DC driven direct acting two-way solenoid valve and a unifilar wound electromagnetic coil. A valve housing 52 is attached to one end of the plunger tube 51, a suction element 53 is attached to the other end of the plunger tube 51, and a unifilar-wound electromagnetic coil 101 is provided around the suction element 53. A valve element 55 is connected to the tip of the plunger 54 in the plunger tube 51. The plunger 54 is urged toward the valve housing 52 by a plunger spring 56.

When the electromagnetic coil 101 is not energized, the valve body 55 is seated on the valve seat 52a by the urging force of the plunger spring 56, and the first port 57 and the second port 58
Is isolated. When the electromagnetic coil 101 is energized,
The plunger 54 is attracted to the suction element 53 against the urging force of the plunger spring 56, the valve element 55 is separated from the valve seat 52a, and the first port 57 and the second port 58 are conducted.
Various driving methods similar to those of the above-described embodiment can be employed for driving the electromagnetic coil 101.

[0050]

According to the fluid control valve of the first aspect, the fluid control valve is reliably operated in the suction driving step, and thereafter driven by a current smaller than the rated current to reliably hold the suction in the holding driving step. Therefore, remarkable energy saving can be achieved.

According to the fluid control valve of the second aspect, the first aspect is as follows.
The same effect as described above can be obtained, and the electromagnetic coil of the fluid control valve is formed into a unifilar winding, and the connection switching means for driving the coil is a semiconductor type unipolar drive type. The drive current can be generated by applying the supply voltage to the electromagnetic coil by easily executing the holding drive step and the detachment drive step.

According to the fluid control valve of claim 3, claim 1 is provided.
Alternatively, the same effects as those of 2 can be obtained, and the energy-saving PWM drive system can be realized with the same hardware configuration as the DC drive system.

According to the fluid control valve of claim 4, claim 1 is provided.
Or 2 can be obtained, and the supply voltage is higher than the rated voltage of the electromagnetic coil, so that the driving (average) current can be controlled to a predetermined driving current required in the suction driving step and the holding driving step by PWM driving. .

According to the fluid control valve of claim 5, claim 1 is provided.
Or the same effect as 2 is obtained.
In WM inverter type air conditioner, supply voltage is DC
Since the voltage is 280 V, the suction driving step can be performed by performing PWM driving with the duty ratio being 50%.

[Brief description of the drawings]

FIG. 1 is a block diagram of a driving device for driving a fluid control valve according to the present invention.

FIG. 2 is an explanatory diagram of a drive sequence when a supply voltage is a rated voltage in the embodiment of the present invention.

FIG. 3 is a circuit diagram illustrating an example of a connection switching unit according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram of a drive sequence when a supply voltage is higher than a rated voltage in the embodiment of the present invention.

FIG. 5 is a principle block diagram of an air conditioner including a drive device for a fluid control valve according to an embodiment of the present invention.

FIG. 6 is a block diagram mainly showing an electric system of an indoor control unit and an outdoor control unit in the embodiment of the present invention.

FIG. 7 is a main block diagram of the air conditioner in the case where the supply voltage generated by the converter according to the embodiment of the present invention is fixed.

FIG. 8 is a main block diagram of the air conditioner in a case where the supply voltage generated by the converter according to the embodiment of the present invention is variable.

FIG. 9 is an explanatory diagram of a driving sequence when a supply voltage fluctuates in the embodiment of the present invention.

FIG. 10 is a view showing a flow path switching valve according to the embodiment of the present invention.

FIG. 11 is a view showing an example of a fluid control valve according to another embodiment of the present invention.

FIG. 12 is a block diagram of a conventional driving device.

FIG. 13 is a diagram showing an example of an AC drive type and a full-wave rectification unsmoothed DC drive type circuit of FIG. 12;

FIG. 14 is a diagram showing an example of a circuit of the smooth DC drive type shown in FIG. 12;

[Explanation of symbols]

 Reference Signs List 24 Plunger 23 Suction element 100 Flow path switching valve (fluid control valve) 101 Electromagnetic coil

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tamon Inoya 535 Sasai, Sayama City, Saitama Prefecture Inside Sagimiya Manufacturing Co., Ltd. (72) Inventor Seiichi Nakahara 535 Sasai, Sayama-shi, Saitama F-term (reference) 3H106 DA23 DB12 DB22 DB32 EE22 FA04 KK23

Claims (5)

[Claims] 1. An electromagnetic coil driven by application of DC power, a plunger, and a suction element for attracting the plunger, wherein the electromagnetic coil is driven to attract, hold and release the plunger with respect to the suction element. A fluid control valve for controlling the fluid by performing a first predetermined current applied to the electromagnetic coil, the suction element attracts the plunger, and a second predetermined current smaller than the first predetermined current. The fluid control valve is configured such that the suction element is applied to hold the plunger in suction when applied, and the plunger is detached from the suction element with the application of electric current being zero. 2. The fluid control valve according to claim 1, wherein the electromagnetic coil is a unifilar winding, and the electromagnetic coil is driven by a semiconductor-type unipolar drive type connection switching unit. 3. When the supply voltage of the DC power supplied to the connection switching means for applying a current to the electromagnetic coil is the rated voltage of the electromagnetic coil, the electromagnetic coil causes the plunger to be attached to the suction element by PWM driving. The fluid control valve according to claim 1, wherein the fluid control valve is configured to be able to hold adsorption of the fluid. 4. When the supply voltage of the DC power supplied to the connection switching means for applying a current to the electromagnetic coil is higher than a rated voltage of the electromagnetic coil, the electromagnetic coil:
3. The fluid control valve according to claim 1, wherein the plunger can be attracted to the suction element by PWM driving, and the suction can be maintained. 5. The rated voltage of the electromagnetic coil is DC140.
V, wherein when the supply voltage supplied to the connection switching means is DC 280 V, the plunger can be attracted to the suction element by PWM drive with a duty ratio of 50%. A fluid control valve according to claim 4.