JP2002364769A - Driving device for fluid control valve and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving device for driving a fluid control valve such as a passage switch valve for an air conditioner, achieving energy saving property and lower cost. SOLUTION: The passage switch valve for the air conditioner comprises a switching transistor 406a provided between an electromagnetic coil 101 for a pilot solenoid valve and a power supply 10. The switching transistor 406a is of a N-channel MOS-FET type. The gate voltage of the switching transistor 406a is controlled by a control part C1 and a signal conversion part 406b. A line BL- on the negative electrode side of the power supply 10 is connected to 0 V of the control part C1 to eliminate the need for electrical insulation means at the signal conversion part 406b. Rated voltage drive is applied in the attraction driving process for attracting a plunger of the pilot solenoid valve and PWM drive is applied in a holding driving process for holding the plunger. 0 V is applied in a separation driving process for the plunger. High- voltage drive and low-voltage drive can be applied in the attraction driving process and in the holding driving process, respectively.

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 drive device of a fluid control valve that drives a switching valve, a fluid control valve that controls the flow of a refrigerant, and the like, and an air conditioner including the drive device of the fluid control valve.

[0002]

2. Description of the Related Art (Background Art-1) Conventionally, relays widely used include 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 a significantly smaller return voltage characteristic than the AC-driven type.

(Background art-2) Japanese Patent Publication No. 59-25
FIG. 3 of Japanese Patent Publication No. 126 discloses that a current detector (40) for detecting a current of a compressor motor (CM) for driving a constant speed compressor (CP) is provided. It is widely known that the compressor motor is of the AC type, so that the current detector comprises a current transformer for detecting AC. Because the current transformer is insulated, the AC power circuit of the compressor system
It is electrically insulated from the DC circuit of the control system including the main control section (11).

(Background Art-3) An example of use of an inverter-driven compressor which is widely used next to the above-mentioned constant speed compressor will be described with reference to FIG. The current transformer 44 detects the current of the compressor 4.
0 is detected, and full-wave rectification and amplification are performed by the arithmetic unit 441, and the result is input to the microcomputer 470 to calculate a current value.
This is insulated similarly to the background art-2. More specifically, the DC power supply circuit of the compressor system and the DC power supply circuit of the control system including the microcomputer 470 are electrically insulated.

(Background Art-4) In recent years, in order to reduce the cost, a shunt resistor 440 is used as shown in FIG. Is used, but the isolation amplifier 445 is required, and there is room for improvement. Also in this case, the DC power supply circuit of the compressor system,
It is electrically insulated from the DC power supply circuit of the control system including the microcomputer 470.

(Background Art-5) As a means for solving the background art-4, a DC power supply circuit of a control system including a negative electrode (BL-) of a DC power supply circuit of a compressor system and a microcomputer 470 as shown in FIG. The negative electrode (CL-: 0 V), the insulating amplifier 445 of the background art-4 becomes unnecessary, the voltage is converted by an inexpensive amplifier 446 widely used, and the A / D input terminal of the microcomputer 470 is used. To easily calculate the compressor current.

(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 sliding four-way valve, and FIG. 4 discloses a DC-driven solenoid valve. The solenoid valve has a permanent magnet 39, and the solenoid valve is of a latch type.

(Prior art-4) JP-A-2001-1410
No. 80 discloses a rotary type four-way valve, which includes an electromagnetic coil unit 10 and a permanent magnet 71.

FIG. 14 is a block diagram of a driving device for driving the four-way valve according to the prior art-1 and the prior art-2.
The circuit except for 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 a 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 the prior art-3 of FIG. 1 is provided with a permanent magnet 39. In addition, when the electromagnetic coil of the prior art-4 is a unifilar winding, it is driven by the circuit of FIG. 17, and when it is a bifilar winding, it is driven by the circuit of FIG.

[0016]

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. For example, even if the voltage is set to 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, and there is room for improvement in energy saving.

In the case where the prior art-1 and the prior art-2 are used in a DC drive system, 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.

The prior art-3 and prior art-4 propose energy saving by applying a drive current to the electromagnetic coil at the time of operation and at the time of return, and thereafter turning off the current. That is,
The fluid control valves (four-way valves) of the prior art-3 and the prior art-4 achieve the energy saving by performing a latch-type drive control on the electromagnetic coil. Since a bipolar drive circuit for switching the polarity is required with the coil, a large number of members are required, which leads to an increase in cost, and there is room for improvement in this point.

In the prior art-3 and the prior art-4, when the fluid control valve is driven by a bifilar wound coil, a unipolar drive circuit may be used, but two circuits are required, and two coils are required. Needless to say, there is still room for improvement as described above.

According to the present invention, in order to solve the above-mentioned problems, a supply voltage suitable for operating an air conditioner is supplied to an electromagnetic coil of a fluid control valve such as a four-way valve or an electromagnetic valve, and the control unit is driven by suction. It is possible to achieve energy saving by driving control of the connection switching means including a process, a holding drive process, and a detachment drive process, as well as realizing resource saving, and driving a fluid control valve having a more inexpensive and highly reliable configuration. It is an object to provide an air conditioner including a device and a drive device for a fluid control valve.

[0021]

According to a first aspect of the present invention, there is provided a drive device for a fluid control valve, wherein the control unit of the drive device drives the fluid control valve with a first predetermined current (rated current). A suction driving step to be activated, and a second driving current smaller than the first predetermined current.
It is characterized by comprising a connection switching means for executing a holding drive step of holding the suction by driving with a predetermined current and a detaching drive step of returning the drive current to 0 to drive the electromagnetic coil.

According to a second aspect of the present invention, there is provided a fluid control valve driving device, wherein one converter generates DC power suitable for an inverter driving a compressor of an air conditioner, and the DC power is generated by another converter. It is characterized in that the electromagnetic coil of the fluid control valve is driven by directly supplying the connection control means (without intervening).

According to a third aspect of the present invention, there is provided a drive device for a fluid control valve, wherein the electromagnetic coil of the fluid control valve is formed by a unifier winding.
A connection switching unit that drives the electromagnetic coil is a semiconductor type unipolar drive type, and is driven by a first predetermined current to attract a plunger of the fluid control valve even if a supply voltage fluctuates; Applying a supply voltage by performing a holding drive step of driving the plunger by suction with a second predetermined current smaller than the predetermined current and holding the plunger in return, with a drive current of 0; And generating a drive current.

According to a fourth aspect of the present invention, there is provided a fluid control valve driving device according to the first, second, or third aspect, wherein the supply voltage supplied to the connection switching means is a rated voltage of the electromagnetic coil. For a predetermined time (for example, 5 seconds), driving is performed at a first predetermined current (rated current), and thereafter, driving is performed by PWM driving.

According to a fifth aspect of the present invention, there is provided a drive device for a fluid control valve having the structure of the first, second, or third aspect, wherein a negative side power source (BL-) of a supply voltage supplied to the connection switching means is provided. The control unit (C1) is connected to 0 V, and the control unit directly sends a drive signal to the connection switching unit.

According to a sixth aspect of the present invention, there is provided a fluid control valve driving device according to the first, second, or third aspect, wherein a supply voltage supplied to the connection switching means is higher than a rated voltage of the electromagnetic coil. In this case, the suction driving step and the holding driving step are executed by PWM driving, and control is performed so that predetermined driving currents are respectively applied.

According to a seventh aspect of the present invention, there is provided a driving device for a fluid control valve having the configuration of the first, second, or third aspect, wherein the rated voltage of the electromagnetic coil is 140 V DC and supplied to the connection switching means. When the supply voltage is 280 VDC, the duty ratio is 5
It is characterized in that the suction drive step is executed by PWM drive with 0%.

An eighth aspect of the present invention is directed to a fluid control valve driving device having the configuration of the second aspect, wherein the rated voltage of the electromagnetic coil is D.
In the case of C140V, the one converter generates a supply voltage of DC140V when starting the compressor.

According to a ninth aspect of the present invention, a fluid control valve driving device is provided with the configuration of the first, second, or third aspect,
Means for detecting a supply voltage supplied to the connection switching means, detecting a (fluctuating) value of the supply voltage, performing PWM drive on the electromagnetic coil, and performing an attraction drive step and a holding drive step It is characterized by.

According to a tenth aspect of the present invention, a drive device for a fluid control valve has the configuration of the first, second, or third aspect, and further includes a unit for detecting a supply voltage supplied to the connection switching unit. Detecting the value of the supply voltage, calculating the drive current in the suction drive step and the drive current in the holding drive step corresponding to the supply voltage, performing PWM drive on the electromagnetic coil, and applying a predetermined drive current. Features.

A fluid control valve driving device according to an eleventh aspect of the present invention has the configuration according to the sixth or ninth aspect, further includes a temperature detecting means, and the driving device includes a temperature detecting means. ), Medium temperature range (middle season), high temperature range (summer season)
Is determined, and the drive current is corrected and calculated.

According to a twelfth aspect of the present invention, a drive device for a fluid control valve has the structure of the first, second, or third aspect, and the drive device includes a drive current detecting means, and performs PWM drive to the electromagnetic coil. At this time, the suction drive step, the holding drive step,
Along with the execution of the separation drive step, the drive current detection means controls the drive current to be a predetermined drive current in each of the steps.

According to a thirteenth aspect of the present invention, in the air conditioner, the electromagnetic coil of the fluid control valve constituting the air conditioner is formed by a unifier winding, and drives the control unit and the electromagnetic coil. A drive device for a fluid control valve according to claim 2 or 3 is provided.

According to a fourteenth aspect of the present invention, there is provided a driving device for a fluid control valve, wherein the electromagnetic coil is driven to be attracted by a high voltage, the electromagnetic coil is driven to be held by a low voltage, and the voltage is set to zero to release. It is characterized by having.

A driving device for a fluid control valve according to a fifteenth aspect of the present invention has the configuration according to the fourteenth aspect, in which the first switch is turned on to drive the electromagnetic coil at a high voltage to cause the magnetic coil to be attracted, and then the second switch is turned on.
After the switch is turned on, the first switch is turned off to drive and hold the electromagnetic coil at a low voltage, and the switch means for turning off the first switch and the second switch to set the voltage to 0 and disconnecting is provided. I do.

According to the driving apparatus for a fluid control valve of the present invention, a high voltage is generated by an AC / DC converter,
/ DC converter generates low voltage and high voltage 0V
The microcomputer is connected to the low voltage side and the low voltage 0V side, and the microcomputer sends the drive signal directly to the first switch and the second switch.

According to a seventeenth aspect of the present invention, a fluid control valve driving device is provided with the configuration of the sixteenth aspect, wherein the AC / D of the air conditioner is provided.
A high voltage is generated by the C converter and the DC /
A low voltage is generated by a DC converter, and the 0V side of the high voltage and the 0V side of the low voltage are connected to one end of a resistor for detecting the compressor current of the air conditioner. And to the second switch.

The air conditioner according to claim 18 of the present invention drives the electromagnetic coil of the fluid control valve in an air conditioner provided with a fluid control valve and a control unit. A fluid control valve drive device according to claim 16 or 17 is provided.

According to the fluid control valve driving device of the first aspect, when the control unit of the driving device drives the DC-driven solenoid valve, the suction driving step is performed at the rated current as the first predetermined current. Since the fluid control valve operates and is of a DC type, it is driven by a current smaller than the rated current to hold the suction surely in the holding drive step, and it is ensured that the drive current is set to 0 in the detachment drive step. Return.

According to the second aspect of the present invention, a DC power supply is generated directly from an AC power supply without passing through a transformer or a second converter and supplied as a supply voltage to the fluid control valve. In addition, since the control unit applies a drive to the electromagnetic coil, the drive can be performed without energy loss.

According to the fluid control valve driving device of the third aspect, 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 suction driving step, the holding driving step,
The detachment driving step can be easily performed, and a drive voltage can be generated by applying a supply voltage to the electromagnetic coil.

According to the fluid control valve driving device of the fourth aspect, the same operation and effect as those of the first, second, or third aspect can be obtained, and the energy saving is achieved by the same hardware configuration as that of the DC drive type.
The WM drive type becomes possible. 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 approximately 1/10, the power consumption is approximately 1/100 of the rated power.

According to the fluid control valve driving device of the fifth aspect, the same operation and effect as those of the first, second, or third aspect can be obtained, and the negative power supply BL- of the supply voltage and the control unit C1
0V is connected, the electrical insulation means of the connection switching means becomes unnecessary, and the connection switching means becomes extremely inexpensive.

According to the fluid control valve driving device of the sixth aspect, the same operation and effect as those of the first, second, and third aspects can be obtained, and the supply voltage is larger than the rated voltage of the electromagnetic coil. Accordingly, the driving (average) current can be controlled to a predetermined driving current required in the suction driving step and the holding driving step. In the case of PWM 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 driving device of the seventh aspect, the same operation and effect as those of the first, second, or third aspect can be obtained. For example, in a PWM inverter type air conditioner, the supply voltage is 280 V DC. From the conduction rate 5
If the PWM drive is performed at 0%, the suction drive step can be executed. 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.

According to the fluid control valve driving device of the eighth aspect, the same operation and effect as those of the second aspect can be obtained. For example, when the rated voltage of the electromagnetic coil is 140 V DC in a PAM inverter type air conditioner, If the converter of the air conditioner generates a supply voltage of DC 140 V at the time of starting the machine, the suction driving step can be suitably performed. In addition,
The value of the supply voltage generated differs depending on the air conditioner,
This depends on the design process, and it goes without saying that an electromagnetic coil having a suitable rated voltage may be provided.

According to the fluid control valve driving device of the ninth aspect, the same operation and effect as those of the first, second, and third aspects can be obtained, and for example, in the PAM inverter type air conditioner, the value of the supply voltage that fluctuates Is detected, PWM drive is performed on the electromagnetic coil, and control is performed so that a predetermined drive current required in each drive step is obtained.

According to the fluid control valve driving device of the tenth aspect, the same operation and effect as those of the first, second, and third aspects can be obtained, and the coil resistance is known. it can. Therefore, the duty ratio of the PWM drive is obtained.

According to the fluid control valve driving device of the eleventh aspect, the same operation and effect as those of the sixth and ninth aspects can be obtained, and the known coil resistance varies depending on the ambient temperature. Correct the duty ratio.

According to the fluid control valve driving device of the twelfth aspect, the same operation and effect as those of the first, second, and third aspects can be obtained, and control is performed so that a predetermined driving current is obtained in each step. , Not only enables optimal driving,
Failure of the connection switching means can also be detected. It is normal that the current is 0 at the time of separation.

According to the air conditioner of the thirteenth aspect, due to the electromagnetic coil of the unifier winding and the control step (program) of the control unit (drive unit), there is no energy loss, and the suction, holding, and detachment are surely performed. An air conditioner including a fluid control valve can be provided.

According to the fluid control valve driving device of the present invention, a high voltage power supply (for example, rated voltage of the electromagnetic coil) and a low voltage power supply (for example, approximately 1/10 of the rated voltage) for driving the electromagnetic coil. For example, since the drive unit is switched and used, not only can energy saving be achieved, but also resource saving can be achieved,
Further, reliability can be improved at a lower cost.

According to the driving device for a fluid control valve of the fifteenth aspect of the present invention, the same operation and effect as those of the fourteenth aspect can be obtained.

According to the fluid control valve driving device of the sixteenth aspect of the present invention, the same operation and effect as those of the first and second aspects can be obtained, and the electrical connection between the microcomputer and the first switch and the second switch is obtained. Since no insulating means is required, the circuit configuration is simplified and the cost is reduced.

According to the driving device for a fluid control valve of the seventeenth aspect of the present invention, the same operation and effect as those of the sixteenth aspect can be obtained.

According to the air conditioner of claim 18 of the present invention, the same functions and effects as those of claim 14, claim 15, claim 16, or claim 17 are obtained.

[0057]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fluid control valve driving device according to the present invention will be described below with reference to the drawings. FIG. 5 is a basic block diagram of an air conditioner provided with a drive device for a fluid control valve according to the embodiment. 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, 1
0A is a throttle device, 200 is an accumulator, and 100 is a later-described flow path switching valve (four-way valve) as a fluid control valve.

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 shown by the 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. Or, while stopping, the air flow is adjusted by the number of rotations to control the heat exchange capacity of the indoor heat exchanger 9A. Outdoor heat exchanger drive unit C8
Outputs a control signal to an outdoor heat exchanger drive source (e.g., a driver of a fan motor), and the outdoor heat exchanger drive source 401 drives or stops the fan according to the control signal, and also operates or stops the air flow according to the rotation speed. And adjust the outdoor heat exchanger 9B
Control the heat exchange capacity of the

The processing section C 1 is provided with 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 unit 300 of the indoor unit and the outdoor control unit 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 unit 400, the supplied AC is applied to the noise filter 410, then rectified by the converter 420 and smoothed by the 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 means of the compressor 4 and sends a signal from the other end of the shunt resistor to the amplifier 446. The amplifier 446 converts the signal into a voltage suitable for the A / D input terminal of the microcomputer 470 and sends the signal. . 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. Needless to say, the converter 420 is one of the embodiments of the "one converter" of the claims.

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 main 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 and 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 the other side of the valve chamber 22a is connected to a conduction path 32 that is connected to the low-pressure side connection pipe 6. 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 side joint pipe 6 is communicated with the joint pipe 7 through the bore 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.

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 drive device for a fluid control valve according to a first embodiment of the present invention.
DC power generated by a DC / DC converter, etc.
L + and the negative line (negative power supply) BL− are supplied to the electromagnetic coil 101 via the connection switching means (flow path switching valve driving unit) 406. The connection switching unit 406 is controlled by a control signal from the control unit C1, and is configured to supply / disconnect DC power.
De-energization 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 the "suction drive step". 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, at the end of the heating mode or at the time of switching to the cooling mode, the energization to the electromagnetic coil 101 is cut off (the drive current is set to 0) as a "separation drive step", and the plunger 24 is returned to the state of 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 main block diagram of an air conditioner in a case where 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 switching to the heating mode, the supply voltage is initially applied to the electromagnetic coil 101 by PWM drive for 5 seconds as an “adsorption driving step”, and the plunger 24 of the pilot solenoid valve 120 is attracted to the suction element 23 to perform 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 main block diagram of an air conditioner in a case where 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. 12 is a block diagram of a drive device for a fluid control valve according to a second embodiment of the present invention. The higher supply voltage 420 is supplied to the (AC / DC) converter 42 in FIG.
0, which generates approximately DC140V to approximately DC280V. The low supply voltage 460 is the DC / D in FIG.
The C converter 460 generates DC5V for the microcomputer, DC12V or DC24V for the drive unit. The first switch 406 and the second switch 407 are preferably contactless switches. Since it is provided on the high side, for example, a P-type MOS-FET or a PNP type transistor is used. First
A diode provided between switch 406 and second switch 407 prevents current from higher supply voltage 420 from flowing back to lower supply voltage 460.
The connection line connecting the negative electrode (BL−) of the high voltage supply voltage 420 and the negative electrode (CL−: 0 V) of the low voltage supply voltage 460 is the embodiment of claim 16.

FIG. 13 is a diagram showing a driving process according to the second embodiment. The solenoid valve of the fluid control valve (four-way valve) is turned on to set the heating mode. The moment t when the first switch 406 is turned on
Varies from about 0.05 seconds to about 5 seconds, depending on the fluid control valve. While the first switch 406 is on, the suction driving process is performed. It is necessary to turn on the second switch 407 before turning off the first switch 406. First
When the switch 406 is turned on, the second switch 407
Needless to say, it may be turned on. The period from when the first switch 406 is turned off to when the second switch 407 is turned off is a holding drive step. When the second switch 407 is turned off, a detachment driving step is performed.

In the above embodiment, the driving of the pilot solenoid valve 120 of the four-way valve 100 has been described. However, the fluid control valve driving device of the present invention can be applied to other fluid control valves as shown in FIG. FIG. 11 shows an embodiment of a fluid control valve in which a DC-driven direct acting two-way solenoid valve is provided with a unifier 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.

[0084]

According to the driving device for a fluid control valve of the first aspect, the fluid control valve is reliably operated in the suction driving step, and is thereafter driven with a current smaller than the rated current to be sure in the holding driving step. Since the absorption is maintained, remarkable energy saving can be achieved.

According to the driving apparatus for a fluid control valve of the present invention, a DC power supply is directly generated from an AC power supply without passing through a transformer or a second converter and supplied as a supply voltage to the fluid control valve. In addition, since the control unit applies a drive to the electromagnetic coil, the drive can be performed without energy loss.

According to the fluid control valve driving device of the third aspect, 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 suction driving step, the holding driving step,
The detachment driving step can be easily performed, and a drive voltage can be generated by applying a supply voltage to the electromagnetic coil.

According to the fluid control valve driving device of the fourth aspect, the same effect as that of the first, second, or third aspect can be obtained, and the energy saving PWM can be achieved by the same hardware configuration as that of the DC drive type.
The drive type becomes possible.

According to the fluid control valve driving device of the fifth aspect, the same effects as those of the first, second, or third aspect can be obtained, and the negative power supply BL- of the supply voltage and the zero of the control unit C1 are provided.
Since V is connected, the electrical insulation means of the connection switching means becomes unnecessary, and the connection switching means becomes extremely inexpensive.

According to the fluid control valve driving device of the sixth aspect, the same effect as that of the first, second, or third aspect can be obtained, and the supply voltage is larger than the rated voltage of the electromagnetic coil. The driving (average) current can be controlled to a predetermined driving current required in the suction driving step and the holding driving step.

According to the fluid control valve driving device of the seventh aspect, the same effects as those of the first, second, or third aspect can be obtained. For example, in a PWM inverter type air conditioner, the supply voltage is 280 V DC. , 50% conduction rate
, The suction driving step can be executed.

According to the fluid control valve driving device of the eighth aspect, the same effects as those of the second aspect can be obtained. For example, in a PAM inverter type air conditioner, when the rated voltage of the electromagnetic coil is 140 V DC, the compressor If the converter of the air conditioner generates a supply voltage of DC140V at the start of the operation, the suction driving step can be suitably executed.

According to the fluid control valve driving device of the ninth aspect, the same effect as that of the first, second, or third aspect can be obtained. For example, in a PAM inverter type air conditioner, the value of the supply voltage that fluctuates can be reduced. Detect and PW to electromagnetic coil
Since the M driving is performed and the driving current is controlled so as to be a predetermined driving current required in each driving step, it is easy to use (drive).

According to the fluid control valve driving device of the tenth aspect, the same effect as that of the first, second, or third aspect is obtained, and the average driving current can be calculated because the coil resistance is known. , The duty ratio of the PWM drive is obtained.

According to the fluid control valve driving device of the eleventh aspect, the same effect as that of the sixth or ninth aspect is obtained, and the known coil resistance fluctuates depending on the ambient temperature. The rate can be corrected.

According to the fluid control valve driving device of the twelfth aspect, the same effect as that of the first, second, or third aspect can be obtained, and control is performed such that a predetermined driving current is obtained in each step. Not only optimal driving becomes possible, but also a failure of the connection switching means can be detected.

According to the air conditioner of the thirteenth aspect, due to the electromagnetic coil of the unifier winding and the control step (program) of the control unit (drive unit), there is no energy loss, and the suction, the holding and the separation are surely performed. An air conditioner including a fluid control valve can be provided.

According to the fluid control valve driving device of the fourteenth aspect, not only energy saving can be achieved, but also resource saving can be realized.
Further, reliability can be improved at a lower cost.

According to the fluid control valve driving device of the fifteenth aspect of the present invention, the same effect as that of the fourteenth aspect can be obtained.

According to the fluid control valve driving device of the sixteenth aspect of the present invention, the same effects as those of the first and second aspects are obtained, and the electrical insulation between the microcomputer and the first and second switches is achieved. Since no means is required, the circuit configuration is simplified and the cost is reduced.

According to the fluid control valve driving device of the seventeenth aspect of the present invention, the same effect as that of the sixteenth aspect can be obtained.

According to the air conditioner of claim 18 of the present invention, the same effects as those of claim 14, claim 15, claim 16, or claim 17 are obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a drive device for a fluid control valve according to a first embodiment of 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 diagram showing an example of another fluid control valve to which the present invention can be applied.

FIG. 12 is a block diagram of a drive device for a fluid control valve according to a second embodiment of the present invention.

FIG. 13 is a diagram illustrating a driving process according to a second embodiment.

FIG. 14 is a block diagram of a conventional driving device.

FIG. 15 is a diagram showing an example of an AC drive type and full-wave rectification unsmoothed DC drive type circuit of FIG. 12;

FIG. 16 is a diagram showing an example of a circuit of the smooth DC drive type shown in FIG. 12;

FIG. 17 is a diagram illustrating an example of a drive circuit in the case where the electromagnetic coil of the related art-3 is a unifier winding.

FIG. 18 is a diagram illustrating an example of a drive circuit in the case where the electromagnetic coil of the related art-3 is a bifilar winding.

FIG. 19 is a diagram illustrating an example of use of an inverter-driven compressor.

FIG. 20 is a diagram illustrating an example of an improved technique for calculating a compressor current using a shunt resistor.

[Description of Signs] 10 Power supply 101 Electromagnetic coil 110 Four-way valve main body 120 Pilot solenoid valve 406 Connection switching means C1 Control unit 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 in Sayama Works, Sayama Works (Reference) 3H106 DA08 DA23 DB02 DB12 DB22 DB32 DC08 DD06 EE01 EE22 FA04 KK23 3L060 AA01 AA03 DD01 DD02 DD07 EE09 EE10

Claims (18)

[Claims] 1. A suction driving step of driving a fluid control valve by a control unit of a driving device by driving the fluid control valve with a first predetermined current; and driving the suction by driving a fluid with a second predetermined current smaller than the first predetermined current. And a connection switching means for driving the electromagnetic coil by performing a holding drive step of holding the drive current and a detachment drive step of returning the drive current to zero. 2. A converter generates DC power suitable for an inverter for driving a compressor of an air conditioner, and supplies the DC power directly to connection switching means to drive an electromagnetic coil of a fluid control valve. A fluid control valve driving device, characterized in that: 3. An electromagnetic coil of the fluid control valve is formed into a unifilar winding, and a connection switching means for driving the electromagnetic coil is a semiconductor type unipolar drive type, and is driven by a first predetermined current even when a supply voltage fluctuates. A suction driving step of adsorbing the plunger of the fluid control valve, a holding driving step of driving the plunger by driving it with a second predetermined current smaller than a first predetermined current, and A drive device for a fluid control valve, wherein the drive device generates a drive current by applying the supply voltage. 4. When the supply voltage supplied to the connection switching means is the rated voltage of the electromagnetic coil, the motor is driven by a first predetermined current for a predetermined time and thereafter driven by PWM driving. 4. The driving device for a fluid control valve according to 1, 2, or 3. 5. A connection between a negative power supply of a supply voltage supplied to the connection switching means and 0 V of a control section, and the control section directly sends a drive signal to the connection switching means. 4. The driving device for a fluid control valve according to 1, 2, or 3. 6. When the supply voltage supplied to the connection switching means is higher than the rated voltage of the electromagnetic coil, a suction driving step and a holding driving step are executed by PWM driving, and respective predetermined driving currents are applied. 4. The fluid control valve driving device according to claim 1, wherein the control is performed in the following manner. 7. The rated voltage of the electromagnetic coil is 140 V DC, and the supply voltage supplied to the connection switching means is DC.
In the case of 280 V, the adsorption drive step is set to P
4. The drive device for a fluid control valve according to claim 1, wherein the drive is performed by WM drive. 8. The driving of the fluid control valve according to claim 2, wherein when the rated voltage of the electromagnetic coil is DC 140 V, the one converter generates a supply voltage of DC 140 V when starting the compressor. apparatus. 9. A device for detecting a supply voltage supplied to the connection switching unit, wherein a value of the supply voltage is detected,
4. The fluid control valve driving device according to claim 1, wherein PWM driving is performed on the electromagnetic coil to perform a suction driving step and a holding driving step. 10. A means for detecting a supply voltage supplied to said connection switching means, detecting a value of said supply voltage, a driving current corresponding to said supply voltage in a suction driving step, and a driving current in a holding driving step. 4. The drive device for a fluid control valve according to claim 1, wherein the drive current is calculated, PWM drive is performed on the electromagnetic coil, and a predetermined drive current is applied. 11. The driving device according to claim 6, wherein the driving device includes temperature detecting means, and determines a low temperature range, a medium temperature range, and a high temperature range based on the value of the temperature detecting means, and corrects and calculates the driving current. 10. A drive device for a fluid control valve according to claim 9. 12. The driving device comprises a driving current detecting means,
When performing the PWM drive to the electromagnetic coil, the drive current detecting means controls the drive current to be a predetermined drive current in each of the processes in accordance with the execution of the suction drive step, the hold drive step, and the separation drive step. The drive device for a fluid control valve according to claim 1, 2, or 3. 13. An electromagnetic coil of a fluid control valve constituting an air conditioner, which is formed by a unifier winding, a control unit,
An air conditioner comprising: the fluid control valve driving device according to claim 1, which drives the electromagnetic coil. 14. A drive device for a fluid control valve, comprising: switch means for driving and attracting an electromagnetic coil at a high voltage, driving and holding the electromagnetic coil at a low voltage, and releasing the voltage at zero. . 15. Turning on the first switch to drive and attract the electromagnetic coil at a high voltage, then turning on the second switch, and then turning off the first switch to drive the electromagnetic coil at a low voltage. 15. The drive device for a fluid control valve according to claim 14, further comprising switch means for keeping the first switch and the second switch off to set the voltage to 0 and releasing the switch. 16. A high voltage is generated by an AC / DC converter, a low voltage is generated by a DC / DC converter, and a high voltage 0V side is connected to a low voltage 0V side, and the microcomputer directly drives the driving signal. A driving device for the fluid control valve, wherein the driving signal is sent to the first switch and the second switch. 17. A high voltage is generated by an AC / DC converter of the air conditioner, and a low voltage is generated by a DC / DC converter of the air conditioner.
3. The microcomputer according to claim 1, wherein the V side is connected to one end of a resistor for detecting a compressor current of the air conditioner, and the microcomputer sends a drive signal directly to the first switch and the second switch.
7. A drive device for a fluid control valve according to claim 6. 18. The fluid control valve according to claim 14, wherein the air conditioner provided with the fluid control valve and the control unit drives an electromagnetic coil of the fluid control valve. An air conditioner comprising the driving device of (1).