JP2003021433A - Driving device for fluid control valve and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the reduction of the cost of a driving device for driving a fluid control valve such as a flow passage switching valve or the like for an air conditioner. SOLUTION: A solenoid coil for attracting/releasing a plunger for a pilot solenoid valve (fluid control valve) in a flow passage switching valve (four-way valve) for the air conditioner is constituted of a bifilar winding consisting of a driving coil 111 for attraction, and a driving coil 112 for releasing. A common power supplying lead wire 113 of the driving coil 111 for attraction and the driving coil 112 for releasing is connected to the positive pole side line BL+ of a power supply 10. The driving side lead wire 11a of the driving coil for attraction 111, and the driving side lead wire 112a of the driving coil for releasing 112, are connected to the negative pole side line BL- through a connection switching means 406. The connection switching means 406 is constituted of a switch SW1 and a switch SW2, such as transistors, while the driving coil 111 for attraction and the driving coil 112 for releasing are controlled by a control unit C1 to turn them on independently.

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 composed of a compressor, a flow path switching valve, an outdoor heat exchanger, a throttle device, an indoor heat exchanger, etc., and a flow path for switching the flow direction of a refrigerant. The present invention relates to a drive device for a fluid control valve that drives a switching valve, a fluid control valve that controls the flow of refrigerant, and the like, and an air conditioner that includes the drive device for the fluid control valve.

[0002]

2. Description of the Related Art (Prior Art-1) Conventionally, as a fluid control valve, there is a sub valve disclosed in Japanese Patent Laid-Open No. 11-287352. This sub-valve is used for a four-way switching valve, and is provided with a permanent magnet and a coil for moving / adsorbing a movable iron core that switches a flow path.

(Prior Art-2) Further, as a fluid control valve, there is an electromagnetic valve disclosed in Japanese Patent Laid-Open No. 11-311363, and this fluid control valve comprises a single coil and a magnet.

[0004]

The prior art-1 and the prior art-2 further require a resistance R at the time of disengagement in order to make the suction force at the time of suction different from the suction force at the time of disengagement. Since it is a single coil, the connection switching means is complicated and a large number of members are required, so that the drive unit becomes expensive and there is room for improvement.

It is an object of the present invention to provide an inexpensive fluid control valve drive device and air conditioner by simplifying the structure of the connection switching means for driving the drive coil without using the resistor R.

[0006]

According to a first aspect of the present invention, there is provided a drive device for a fluid control valve, wherein an electromagnetic coil of the fluid control valve comprises an adsorption drive coil and a release drive coil. A connection switching means for driving
Characterize.

A drive device for a fluid control valve according to a second aspect of the present invention has the configuration according to the first aspect, and the drive current to the release drive coil is smaller than the drive current to drive the adsorption drive coil. Is characterized.

A drive device for a fluid control valve according to a third aspect of the present invention has the structure of the first aspect, and the connection switching means is an MO.
It is characterized by being constituted by an S-FET.

According to a fourth aspect of the present invention, there is provided a drive device for a fluid control valve, wherein an electromagnetic coil of the fluid control valve comprises an adsorption drive coil and a detachment drive coil, and the connection switching means drives the two drive coils. And a drive current to the attraction drive coil and / or a drive current to the detachment drive coil are generated by PWM-controlling and applying a supply voltage.

According to a fifth aspect of the present invention, there is provided a drive device for a fluid control valve, wherein an electromagnetic coil of the fluid control valve comprises an adsorption drive coil and a detachment drive coil, and the connection switching means drives the two drive coils. The control unit controls the voltage variable signal to generate a supply voltage, and the drive current to the attraction drive coil and the drive current to the detachment drive coil are generated by applying predetermined supply voltages, respectively. It is characterized by doing.

In the air conditioner according to a sixth aspect of the present invention, the electromagnetic coil of the fluid control valve constituting the air conditioner is composed of an adsorption drive coil and a removal drive coil, and the control section and the two The drive device for a fluid control valve according to claim 1, 4, or 5 for controlling a drive coil is provided.

According to the drive device of the fluid control valve of the first aspect, since the electromagnetic coil is a bifilar wound coil composed of the adsorption drive coil and the detachment drive coil, when an electric current is passed, the adsorption and detachment coils are generated. The magnetic force can be generated in the opposite direction. Therefore, only two transistors are required in the drive circuit as the connection switching means for driving the two drive coils. Conventionally, four transistors are required for bidirectional energization.

According to the drive device of the fluid control valve of the second aspect, the same action and effect as those of the first aspect can be obtained, and the drive current at the time of disengagement is smaller than the drive current at the time of adsorption, so that the device is favorably disengaged.

According to the drive device for the fluid control valve of the third aspect, the same operational effect as that of the first aspect can be obtained, and M
Since the connection is switched by the OS-FET, a bias current for driving is unnecessary, and the remaining voltage of the connection switching means is small, so that energy loss is small.

According to the fluid control valve drive device of claim 4, for example, AC100V is double-voltage rectified, or A
C200V is full-wave rectified to generate DC280V, and the rated voltage of the electromagnetic coil (driving coil) is, for example, DC150.
Since the value of the supply voltage is larger when V is set, the connection switching means for driving the two drive coils is used to determine the drive current at the time of adsorption or the drive current at the time of separation, and the supply voltage at PW.
It can be suitably driven by generating it by M driving.
(The same applies not only to a PWM drive type inverter air conditioner, but also to a PAM drive type inverter air conditioner.) Further, since the supply voltage is generated by PWM driving, no hardware member is required and software can be used.

The rated voltage of the electromagnetic coil is, for example, DC28.
When it is set to 0V, DC280V is 100% energized during adsorption,
Only at the time of leaving, the PWM control of DC280V is performed. That is,
Applying the drive current by PWM control is only when leaving
Alternatively, it may be either adsorbed or detached.

According to a fifth aspect of the present invention, there is provided a fluid control valve drive device, comprising connection switching means for driving two drive coils,
Since the voltage variable signal is controlled to supply the supply voltage suitable for generating the drive current at the time of adsorption, or the supply voltage suitable for generating the drive current at the time of separation, it is possible to preferably drive. (It is suitable for PAM-driven inverter air conditioners.)

According to the air conditioner of claim 6, the same effect as that of claim 1, claim 4, or claim 5 can be obtained.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a drive device for a fluid control valve and an air conditioner according to the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of a fluid control valve targeted by the present invention. The fluid control valve in the first embodiment is a latch type solenoid valve 105. In this electromagnetic valve 105, a spherical valve 5 is attached to the tip of the permanent magnet 1 and the plunger 2, and a coil spring 3 is arranged between the plunger 2 and the suction element 4. The plunger 2 moves according to the magnetism of the permanent magnet 1 and the magnetism generated by the attraction drive coil 111 or the detachment drive coil 112, and the plunger 2
Is absorbed by the suction element 4, the valve 5 is separated from the valve seat 6, and the plunger 2 is separated from the suction element 4, so that the valve 5 is seated on the valve seat 6.

The attraction drive coil 111 and the removal drive coil 112 constitute a bifilar winding electromagnetic coil, and the drive side lead wire 111a of the attraction drive coil 111, the drive side lead wire 112a of the removal drive coil 112, and both. Three lead wires of a power supply lead wire 113 common to the drive coils 111 and 112 are drawn to the outside.
The attraction drive coil 111 and the detachment drive coil 112 have opposite winding directions, and the attraction drive coil 111
And when driving the detachment drive coil 112,
A current in the same direction is passed through the power supply lead wire 113. Then, the attraction drive coil 111 generates an attraction magnetomotive force, and the removal drive coil 112 generates a removal magnetomotive force in a direction opposite to the attraction magnetomotive force.

That is, when a voltage is applied to the attraction drive coil 111 so as to generate a magnetic flux in the same direction as the magnetic flux of the permanent magnet 1, the magnetic flux of the permanent magnet 1 and the attraction drive coil 111 are applied.
An attractive force is generated by the magnetic flux combined with the magnetic flux of, and the plunger 2 is attracted to the attractor 4 against the force of the coil spring 3. As a result, the valve 5 is separated from the valve seat 6 and is in the valve open state. Here, even if the energization to the attraction drive coil 111 is cut off, the attraction force due to the magnetic flux of the permanent magnet 1 which becomes stronger because the attraction element 4 and the plunger 2 are attracted and the gap is eliminated. Since it is set stronger than the force, it keeps this position (valve open state). In this state, when a voltage is applied to the detachment drive coil 112 so as to generate a magnetic flux in a direction opposite to that of the permanent magnet 1, the magnetic flux obtained by subtracting the magnetic flux of the permanent magnet 1 and the detachment drive coil 112 is attracted. A force is generated, but when this suction force becomes weaker than the force of the coil spring 3, the plunger 2 is separated from the suction element 4 and the valve is closed.

Here, a description will be given on the basis of FIG. When a rated voltage is applied to the disengagement drive coil 112 in order to put the solenoid valve 105 into the “closed” state, a synthetic attractive force F3 (applied voltage = rated voltage) generated by the reduced magnetic flux.
However, since the combined attractive force due to the reduced magnetic flux acts to attract the plunger 2 and the attractor 4 made of a magnetic material, the attractive force F3> the coil spring force F1 and the electromagnetic force is generated. The valve does not "close". Figure 2
When the applied voltage is in the range of V2 to V1, the combined attractive force ≦ the coil spring force F1 and the state is “closed”. Therefore, in order to perform a stable "valve closing" operation,
It is desirable that the applied voltage of the detaching drive coil 112 is V0 and the combined attractive force is 0, and the detaching drive coil 112 is detached by the force F1 of the coil spring to perform the "closed" operation. The solenoid valve 105 of the first embodiment is driven by a drive circuit described later.

Next, a second example of the fluid control valve will be described together with an air conditioner equipped with the fluid control valve drive device of the embodiment. FIG. 7 is a principle block diagram of the air conditioner of the embodiment. In the refrigeration cycle A, 4 is a compressor, 9A is an indoor heat exchanger mounted in the indoor unit, and 9 is an indoor heat exchanger.
B is an outdoor heat exchanger mounted on the outdoor unit, 10A is a throttle device, 200 is an accumulator, and 100 is a flow path switching valve (four-way valve) described later. The fluid control valve of the second embodiment is used for the flow path switching valve 100.

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

On the other hand, in the cooling operation mode, the refrigerant compressed by the compressor 4 flows 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 line arrow in the figure. 9A, flow path switching valve 100, accumulator 2
00, and 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 controller C shown by the alternate long and short dash line in FIG. 7 corresponds to the indoor controller of the indoor unit, the outdoor controller of the outdoor unit, and the drive device of the fluid control valve of the present invention. The processing section C1 is composed of a microcomputer. The input section C2 corresponds to a remote control receiving section of an indoor unit or a manual switch, and the detecting section C3 corresponds to various temperature sensors (temperature detecting means) or pressure detecting means, flow rate detecting means, 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 drive section C6, the indoor heat exchanger drive section C7, the outdoor heat exchanger drive section C8, and the compressor drive section C9.
Is a unit that functions by executing a control program described later. In addition, the flow path switching valve drive unit 406 is the flow path switching valve 1
It corresponds to the driver that drives the electromagnetic coil 00.

The diaphragm driving unit C6 outputs a control signal to the diaphragm driving source (eg, stepping motor) 404, and controls the aperture of the diaphragm of the diaphragm 10A via the diaphragm driving source 404. The indoor heat exchanger drive unit C7 outputs a control signal to an indoor heat exchanger drive source (for example, a fan motor driver), and the indoor heat exchanger drive source 301 drives the crossflow fan in accordance with 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 drive unit C8 outputs a control signal to an outdoor heat exchanger drive source (for example, a fan motor driver), and the outdoor heat exchanger drive source 401 drives a fan according to the control signal to start or stop the fan. In addition, the heat exchange capacity of the outdoor heat exchanger 9B is controlled by the rotation speed.

The processing section C1 is a flow path switching valve drive section 40.
6, the flow path switching valve drive unit 406 outputs a flow path switching valve drive source for switching the flow path of the flow path switching valve 100 in accordance with the control signal (a bifilar winding drive coil described later). ) Supply power to 111 and 112. Further, the compressor driving unit C9 outputs a control signal to the compressor power source (for example, an inverter module and a motor) 450, the compressor power source 450 drives the compressor 4, and the compressor 4 rotates forward and backward. Rotation, start, stop, capacity switching, etc. are controlled.

FIG. 8 is a block diagram mainly showing the electrical system of the indoor control unit 300 of the indoor unit and the outdoor control unit 400 of the outdoor unit. The indoor controller 300 turns on the main power
It has a built-in power relay 310 that is turned off.
It is supplied to the DC converter 320, converted into various predetermined DC voltages by the AC / DC converter 320, and the microcomputer 3
30 etc. Note that the microcomputer 330 has an EEP
The ROM 340 is connected. Also, power relay 3
The 100 V single-phase alternating current supplied via 10 is also supplied to the outdoor control unit 400 via the power supply lines 220 and 221.

In the outdoor control section 400, after the supplied alternating current is applied to the noise filter 410, it is rectified by the converter 420 and smoothed by the smoothing capacitor 430 to generate a predetermined DC voltage. The generated direct current is supplied to the inverter module 450 via the shunt resistor 440.
Is supplied to. Then, three-phase electric power is generated by the inverter module 450 and supplied to the compressor 4.

On the other hand, the output of the smoothing capacitor 430 is DC
The signal 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 outputs a drive signal to the inverter module 450 to control the operation of the compressor 4.
An EEPROM 480 and a voltage detector 490 are connected to the microcomputer 470.
In 80, 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 exchanges data by performing serial communication with the microcomputer 330 of the indoor control unit 300 via the communication line 210.

FIG. 3 shows a second embodiment of the fluid control valve. The fluid control valve of the second embodiment is a pilot solenoid valve 1 which constitutes a flow path switching valve 100 together with a four-way valve body 110.
Twenty. The four-way valve body 110 is a cylindrical valve body 1
1, and a high pressure side joint pipe 5 connected to the discharge port of the compressor 4 is connected to the outer periphery thereof. Further, the accumulator 20 is provided at a position half the circumference of the joint pipe 5 of the valve body 11.
The low-pressure side joint pipe 6 connected to 0 and the joint pipes 7 and 8 connected to the two indoor and outdoor heat exchangers 9A and 9B are respectively connected. The three joint pipes 6, 7, and 8 are connected to the valve body 11
Is connected to the valve seat 12 inside. Valve body 11
Inside, a first piston 14 and a second piston 15 connected by a connecting rod 13 are arranged, and inside the valve body 11,
The pistons 14 and 15 define a high pressure chamber R1, a pressure conversion chamber R2, and a pressure conversion chamber R3. In addition, a slide valve 16 that is closely attached to the valve seat 12 is provided on the connecting rod 13.
Is attached. The plugs 17 and 18 are welded and fixed to both ends of the valve body 11.

On the other hand, in the pilot solenoid valve 120, the valve housing 22 is attached to one end of the plunger tube 21, and the suction element 23 is attached to the other end of the plunger tube 21.
Is attached, and a permanent magnet 231 is attached around it.
Is provided. A plunger 24 is accommodated in the plunger tube 21, a plunger rod 24a is connected to the tip of the plunger 24, and a slide valve 25 is attached to the end of the plunger rod 24a. The plunger 24 is biased toward the valve housing 22 by the plunger spring 26.
One of the valve chambers 22a in the valve housing 22 is connected to the conduction passage 31 which is electrically connected to the high pressure side joint pipe 5 of the four-way valve body 110, and the other of the valve chambers 22a is electrically connected to the low pressure side joint pipe 6. The conductive path 32, the conductive path 33 that is conductive to the pressure conversion chamber R2, and the conductive path 34 that is conductive to the pressure conversion chamber R3 are connected in parallel. The conduction paths 32, 33, 34 are connected to the valve seat 27 facing the valve chamber 22a.

Further, around the plunger tube 21, between the valve housing 22 and the permanent magnet 231, a bifilar winding attraction drive coil 111 and a removal drive coil 112 are arranged. Adsorption drive coil 111
Drive-side lead wire 111a, the drive-side lead wire 112a of the detaching drive coil 112, and both drive coils 111, 1
The three power supply lead wires 113 common to the two 12 are drawn to the outside. The drive coil and the lead wire are the same as those used in the first embodiment.

Similar to the first embodiment, the attraction drive coil 1
11 and the detachment drive coil 112 have opposite winding directions, and when the attraction drive coil 111 and the detachment drive coil 112 are respectively driven, a current in the same direction is passed through the power supply lead wire 113. Then, the attraction drive coil 111 generates an attraction magnetomotive force, and the removal drive coil 112 generates a removal magnetomotive force in a direction opposite to the attraction magnetomotive force.

With the above configuration, the pilot solenoid valve 12
The 0 and four-way valve body 110 operates as follows. The state of FIG. 3 is when the energization drive coil 111 is not energized, the slide valve 25 is on the left side in FIG. 3 due to the urging force of the plunger spring 26, and the pressure conversion chamber R2
Is the passage 33, the lumen of the slide valve 25, and the passage 3
2 is connected to the low-pressure side joint pipe 6 via the pressure conversion chamber R3.
Is conducted to the high-pressure side joint pipe 5 through the conducting passage 34, the valve chamber 22a, and the conducting passage 31. Therefore, the internal pressure of the pressure conversion chamber R3 becomes higher than the internal pressure of the pressure conversion chamber R2, and the pistons 14 and 15 and the slide valve 16 are maintained in the state of FIG. As a result, the low-pressure side joint pipe 6 is communicated with the joint pipe 7 through the inner cavity of the slide valve 16, and the high-pressure side joint pipe 5 is communicated with the joint pipe 8 through the high-pressure chamber R1.

The attraction drive coil 111, the removal drive coil 112, the plunger spring 26, and the permanent magnet 231.
The action of is similar to that of the first embodiment. That is, when a voltage is applied to the attraction drive coil 111 so as to generate a magnetic flux in the same direction as the magnetic flux of the permanent magnet 231, the permanent magnet 231
The attraction force is generated by the magnetic flux that is combined with the magnetic flux of (1) and the attraction drive coil 111, and the plunger 24 is attracted to the attractor 23 against the force of the plunger spring 26.

As a result, the slide valve 25 moves from the position shown in FIG. 3 to the right, and the pressure conversion chamber R2 is electrically connected to the high pressure side joint pipe 5 via the passage 33, the valve chamber 22a and the passage 31. The pressure conversion chamber R3 includes a conduit 34 and a slide valve 2
The low-pressure side joint pipe 6 is electrically connected through the lumen of No. 5 and the conducting path 32. 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 and 15 and the slide valve 16 are moved to the right from the position in FIG. As a result, the high pressure side joint pipe 5 is communicated with the joint pipe 7 via the high pressure chamber R1, and the low pressure side joint pipe 6 is communicated with the joint pipe 8 via the inner cavity of the slide valve 16.

Here, even if the energization of the attraction drive coil 111 is cut off, the attraction force due to the magnetic flux of the permanent magnet 231 becomes stronger because the gap becomes smaller because the attraction element 23 and the plunger 23 are attracted. Since it is set to be stronger than the force of the plunger spring 26, this position is maintained. In this state, a voltage is applied so as to generate a magnetic flux in a direction opposite to the magnetic flux of the permanent magnet 231, and the drive coil 112 for disconnection is used.
When applied to, a magnetic flux of the permanent magnet 231 and a magnetic flux of the detachment drive coil 112 is reduced to generate an attractive force.
When this suction force becomes weaker than the force of the plunger spring 26, the plunger 24 is separated from the suction element 23 and returns to the state of FIG.

As described above, the operation mode of the refrigeration cycle A is switched by controlling the energization / non-energization of the adsorption drive coil 111 and the disengagement drive coil 112 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 the adsorption drive coil 111 is energized in the heating mode.

FIG. 4 is a block diagram of the drive device for the fluid control valve according to the embodiment of the present invention, in which the supplied power 10 is AC / D.
The DC power generated by the C converter or the like is fed to the positive side line BL +
And the negative line (negative power supply) BL-. The positive electrode side line BL + is the power supply lead wire 11
3 is connected to the attraction drive coil 111 and the detachment drive coil 112, and the drive side lead wire 111a of the attraction drive coil 111 and the drive side lead wire 112a of the detachment drive coil 112 are connected to the connection switching means 406. ing.
The connection switching means 406 is connected to the negative line BL-,
A switch S for electrically connecting the attraction drive coil 111 and the removal drive coil 112 to the negative line BL- independently.
Functions as W1 and SW2. The connection switching means 406 is controlled by the control signal from the control section C1.
The connection switching means 406 energizes / disengages DC power to the attraction drive coil 111 and the detachment drive coil 112. A flywheel diode is connected in parallel to each of the attraction drive coil 111 and the removal drive coil 112, but they are not shown in FIG.

FIG. 5 is an example of the operation sequence of FIG. 4, and shows a case where 100% of the supplied power is supplied during adsorption and 80% of the supplied power is supplied during separation. That is, at the time of adsorption, 3 is applied to the adsorption drive coil 111.
Supply DC power for 2 seconds. Further, at the time of disconnection, conduction of 4 ms and non-conduction of 1 ms are repeated for 3 seconds to the drive coil 112 for separation, and PWM control is performed to supply DC power.

In FIG. 6, the connection switching means 406 is a MOS-FE.
FIG. 6 is a circuit diagram composed of T switching transistors 406a and 406b and a simultaneous output inhibiting means 406c, which is an example of a drive circuit in which a bias current of about 0.1 mA flows. The control unit C1 outputs the suction control signal S3 or the separation control signal S4. The adsorption control signal S3 or the separation control signal S4 is output to the switching transistors 406a and 406b via the simultaneous output prohibiting means 406c as a control signal corresponding to the operation sequence of FIG. A flywheel diode is connected in parallel to each of the attraction drive coil 111 and the removal drive coil 112, but they are not shown in FIG.

FIG. 9 is a circuit diagram showing a schematic configuration of a first example of a drive device for a fluid control valve according to the air conditioner of the above embodiment. The AC / DC converter (converter) 421 is
Commercial AC power of 100V, 200V or the like is rectified by a diode or the like to generate DC power of 280V or the like. Then, the DC power generated by the AC / DC converter 421 is converted into AC power by the PWM inverter 451 and supplied to the compressor 4. In addition, the DC power generated by the AC / DC converter 421 is supplied to the connection switching unit 406 via the positive side line BL + and the negative side line BL−. The connection switching unit 406 receives the control signal from the control unit C1 and the suction drive coil 11 of the flow path switching valve 100.
1 and the drive coil 112 for separation are supplied with DC power.

FIG. 10 shows an example of the operation sequence shown in FIG. 9, in which 80% of the power is supplied during adsorption and 64% when released.
The case where the power is supplied (when the power ratio is 100: 80) is shown. That is, at the time of adsorption, 4 ms of conduction and 1 ms of non-conduction are repeated for 3 seconds to the adsorption drive coil 111, and PWM control is performed to supply DC power.
Further, at the time of detachment, the detachment drive coil 112 is set to 3.
Repeat 2 ms conduction and 1.8 ms non-conduction for 3 seconds,
PWM control is performed to supply DC power.

FIG. 11 is a circuit diagram showing a schematic configuration of a second example of the drive device of the fluid control valve according to the air conditioner of the above embodiment. Elements similar to those in FIG. 9 are designated by the same reference numerals as those in FIG. 9, and detailed description thereof is omitted. In the second embodiment, AC
The variable voltage AC / DC converter 422 converts the commercial AC power of 100V into DC power in the range of DC150 to 300V. Electric power of, for example, DC 280V is supplied from the voltage variable AC / DC converter 422 to the PAM inverter 451 and the connection switching means 406. Then, AC power is supplied to the compressor 4 via the PAM inverter 451, and DC power is supplied to the adsorption drive coil 111 or the separation drive coil 112 of the flow path switching valve 100 via the connection switching means 406.

In this second embodiment, the control section C1 outputs a voltage variable signal to the voltage variable AC / DC converter 422 to control the voltage. Then, the output voltage of the voltage-variable AC / DC converter is changed between the time of adsorption and the time of desorption, and as shown in FIG. 12, the voltage (power) at the time of desorption is smaller than that at the time of adsorption.
Drive with.

[0050]

According to the drive device of the fluid control valve of the first aspect, since the electromagnetic coil is a bifilar winding coil composed of the adsorption drive coil and the detachment drive coil, the drive circuit as the connection switching means is provided. You only need two transistors,
An inexpensive drive device can be provided with a simple structure.

According to the drive device of the fluid control valve of the second aspect, the same effect as that of the first aspect can be obtained, and the drive current at the time of disengagement is smaller than the drive current at the time of adsorption, so that the device is suitably disengaged.

According to the fluid control valve driving device of the third aspect, the same effect as that of the first aspect can be obtained, and the MOS device is provided.
-Since the connection is switched by the FET, a bias current for driving is unnecessary, and the remaining voltage of the connection switching means is small, so that energy loss is reduced.

According to the drive device of the fluid control valve of the fourth aspect, the drive current at the time of adsorption or the drive current at the time of release is generated by the PWM drive by the software.
It is easy to use.

According to the drive device of the fluid control valve of the fifth aspect, the voltage variable signal is controlled to supply the supply voltage suitable for generating the drive current at the time of adsorption or generate the drive current at the time of separation. It is easy to use because it supplies the appropriate supply voltage.

According to the air conditioner of claim 6, the same operational effect as that of claim 1, claim 4, or claim 5 can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a first embodiment of a fluid control valve targeted by the present invention.

FIG. 2 is a diagram showing operating characteristics when the fluid control valve is disengaged.

FIG. 3 is a diagram showing a second example of the fluid control valve according to the embodiment of the present invention.

FIG. 4 is a block diagram of a drive device for a fluid control valve according to an embodiment of the present invention.

5 is a diagram showing a drive sequence of FIG. 4. FIG.

FIG. 6 is a circuit diagram showing an example of connection switching means in the embodiment of the present invention.

FIG. 7 is a principle block diagram of the air conditioner according to the embodiment of the present invention.

FIG. 8 is a block diagram mainly showing an electric system of an indoor control unit and an outdoor control unit of the air conditioner in the embodiment of the present invention.

FIG. 9 is a circuit diagram of a first example of a drive device for a fluid control valve according to the air conditioner of the embodiment of the present invention.

FIG. 10 is a diagram showing a drive sequence of FIG. 9.

FIG. 11 is a circuit diagram of a second example of the drive device for the fluid control valve according to the air conditioner of the embodiment of the present invention.

12 is a diagram showing a drive sequence in FIG. 11. FIG.

[Explanation of symbols]

10 Power supply 105 solenoid valve 111 Adsorption drive coil 112 Drive coil for release 120 pilot solenoid valve 406 Connection switching means C1 controller

Continued front page    (72) Inventor Mikiro Matsushima             535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd.             Tokoroyama Office (72) Inventor Seiichi Nakahara             535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd.             Tokoroyama Office F-term (reference) 3H106 DA07 DA08 DA23 DB02 DB19                       DB23 DB32 DC02 DC08 DC17                       DC19 DD03 EE34 FA08 FB47                       KK23 KK34

Claims (6)

[Claims] 1. A drive for a fluid control valve, characterized in that an electromagnetic coil of the fluid control valve is composed of a suction drive coil and a release drive coil, and a connection switching means for driving the two drive coils is provided. apparatus. 2. The drive current to the release drive coil is
The drive device for a fluid control valve according to claim 1, wherein the drive current is smaller than the drive current that drives the adsorption drive coil. 3. The drive device for a fluid control valve according to claim 1, wherein the connection switching means is composed of a MOS-FET. 4. An electromagnetic coil of the fluid control valve is composed of an adsorption drive coil and a detachment drive coil, and a connection switching means for driving the two drive coils is provided, and a drive current to the adsorption drive coil and The drive device for the fluid control valve is characterized in that the drive current to the release drive coil is generated by PWM-controlling and applying a supply voltage. 5. The electromagnetic coil of the fluid control valve is composed of a suction drive coil and a release drive coil, and a connection switching means for driving the two drive coils is provided, and the control section controls the voltage variable signal. A supply voltage is generated, and a drive current to the attraction drive coil and a drive current to the release drive coil are generated by applying a predetermined supply voltage,
A drive device for a characteristic fluid control valve. 6. The electromagnetic control coil of a fluid control valve constituting an air conditioner comprises an adsorption drive coil and a release drive coil, and controls a control unit and the two drive coils. An air conditioner comprising: the drive device for the fluid control valve according to claim 4 or claim 5.