JPH11211283A - Fluid passage switching valve drive device in refrigerating cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid passage switching valve drive device in a refrigerating cycle which can effectively restrict the occurrence of various kinds of troubles of a drive system including an erroneous operation of the fluid passage switching valve in driving the fluid passage switching valve for changing over the fluid passage in a refrigerating cycle for refrigerant from one fluid passage to the other fluid passage by supplying electricity to a solenoid coil. SOLUTION: In controlling a conductive state and a non-conductive state of first to fourth transistors TR1, TR3, TR5 and TR7 by a microcomputer 39 which is operated upon receiving supply of direct current electric power generated by a rectifier 33 or the like, an electric insulation is made between a driver circuit 43 which is electrically connected to the rectifier 33 and a microcomputer 39 by means of a photo coupler 41 and the direct current electric power from the rectifier 33 has its voltage transformed by a DC/DC converter 37 and is supplied to the microcomputer 39.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for driving a flow path switching valve for switching a flow path of a refrigerant in a refrigeration cycle from one flow path to another flow path by energizing an electromagnetic coil.

[0002]

2. Description of the Related Art In the field of home air conditioners, for example, a flow path switching function having a function of switching a supply destination of a high-pressure refrigerant from a compressor by switching an energizing direction to an electromagnetic coil such as a four-way valve. 2. Description of the Related Art There is known a refrigeration cycle in which indoor cooling and heating can be performed by switching from one of an indoor heat exchanger and an outdoor heat exchanger to another by using a valve.

In this type of refrigerating cycle, conventionally, for example, as in a circuit disclosed in the block diagram of FIG. Alternatively, the opening / closing operation of a switch for switching the energization direction or the like is controlled by a microcomputer (hereinafter, abbreviated as a microcomputer).

Therefore, the control of the opening / closing operation of the switch by the microcomputer must be normal in order to make the operation mode of the refrigeration cycle an accurate mode and to perform the switching operation quickly at the time of switching. Required.

[0005]

However, in order to ensure the normality of the above-mentioned switch opening / closing operation control by the microcomputer, the microcomputer malfunctions due to noise and a control signal is erroneously output to a control target such as a switch. Although it is important to prevent such a situation, the circuit disclosed in Japanese Patent Application Laid-Open No. 9-72633 has the following disadvantages.

That is, in the circuit disclosed in the publication, when transmitting and receiving various signals such as operation mode and data relating to each state between the microcomputer of the indoor unit and the microcomputer of the outdoor unit, a serial communication means is used. A circuit is used to connect the indoor unit and the outdoor unit with a signal line and a common line.

The common line used for this connection is a single-phase 100 V
Therefore, if any noise occurs on the commercial power supply side, the noise is superimposed on the serial signal of the desired voltage and transmitted to the microcomputer, and this noise causes the microcomputer to send a control signal to the control target. Erroneous operation such as erroneous output of

In the refrigeration cycle, not only the malfunction of the control system as described above, but also the prevention of various troubles on the circuit such as disconnection and damage, assures the stable operation of the refrigeration cycle. It is extremely important in doing so.

The present invention has been made in view of the above circumstances,
An object of the present invention is to operate a flow path switching valve for switching a flow path of a refrigerant in a refrigeration cycle from one flow path to another flow path by energizing an electromagnetic coil. It is an object of the present invention to provide a flow path switching valve drive device in a refrigeration cycle that can effectively suppress the occurrence of various troubles of a drive system including the above.

[0010]

According to a first aspect of the present invention, there is provided a flow path switching valve driving apparatus for a refrigeration cycle according to the present invention. A drive source for supplying drive power to the electromagnetic coil, and receiving the drive power from the power supply. And a control system for commanding connection and insulation of the power supply source to the electromagnetic coil and the electromagnetic coil is electrically insulated.

According to a second aspect of the present invention, in the refrigeration cycle drive device for a flow path switching valve according to the present invention, the power supply source is provided with a switch means for opening and closing a circuit in response to an external command signal. Connected to an electromagnetic coil, the control system operates upon receiving a supply of transformed power that is transformed by a transforming means that transforms the driving power from the power supply source, and the control system, A command signal output means for outputting the command signal to the switch means, and a photocoupler interposed between the command signal output means and the switch means; and The power supply source and the control system are electrically insulated.

Further, according to a third aspect of the present invention, in the refrigeration cycle drive device for a flow path switching valve according to the present invention, the control system is configured such that the control system transforms the driving power from the power supply source by the transforming means. The second coil is operated by receiving the supplied power, and the second coil is transformed by the second transformer for transforming the driving power from the power supply source into the electromagnetic coil.
The transformed power is energized when switching the flow path of the refrigerant,
The power supply source and the control system are electrically insulated by the transformer and the second transformer.

According to a fourth aspect of the present invention, in the refrigeration cycle flow path switching valve driving device according to the present invention, the power supply source is provided with a mechanical relay that opens and closes a circuit in response to an external command signal. It was connected to an electromagnetic coil, and the contact of the mechanical relay was made of cadmium silver oxide.

Further, according to a fifth aspect of the present invention, in the refrigeration cycle drive device for a flow path switching valve according to the present invention, the power supply source is provided with a mechanical relay that opens and closes a circuit in response to an external command signal. It was connected to an electromagnetic coil, and the contact of the mechanical relay was formed of silver tungsten.

According to a sixth aspect of the present invention, in the refrigeration cycle flow path switching valve driving device according to the present invention, the power supply source is provided via a mechanical relay that opens and closes a circuit in response to an external command signal. It was connected to an electromagnetic coil, and the contacts of the mechanical relay were formed of silver nickel.

Further, according to a seventh aspect of the present invention, there is provided a flow path switching valve driving apparatus in a refrigeration cycle, wherein a positive power supply line and a negative power supply line for supplying the driving power to the electromagnetic coil as a direct current. The power supply source further includes a diode bridge disposed on the positive electrode side of the power supply source, and the electromagnetic coil includes:
A connection point between the anode of one diode and the cathode of another diode that constitutes the diode bridge, and two connections that are not electrically connected to either the positive side or the negative side of the power supply. It is assumed to be provided between the points.

Further, the flow path switching valve drive device in the refrigeration cycle according to the present invention further includes a surge current suppressing means connected in parallel with the electromagnetic coil to the power supply source. did.

Further, the flow path switching valve driving device in the refrigeration cycle according to the present invention according to claim 9 further comprises a thermal protection means connected in series with the electromagnetic coil to the power supply source. did.

In the refrigeration cycle according to a tenth aspect of the present invention, the flow path switching valve driving device further includes overcurrent protection means connected in series with the electromagnetic coil to the power supply source. did.

Further, according to the eleventh aspect of the present invention, in the refrigeration cycle, the flow path switching valve driving device includes two power supply lines connected to both ends of the electromagnetic coil for supplying the driving power. In addition, the two power supply lines are stranded so as to function as a capacitor having a capacitance therebetween.

According to the first aspect of the present invention, in the refrigeration cycle drive device for a refrigeration cycle, the refrigerant flow path in the refrigeration cycle is switched from one flow path to another flow path to the electromagnetic coil. When the energization is started or the energization is stopped at the end of the switching, even if noise is generated on the power supply side of the driving power, the control system electrically insulated from the power supply is Since this noise is not transmitted, the control system does not malfunction due to noise caused by energization or stoppage of the electromagnetic coil, so that a normal operation of the refrigeration cycle can be stably ensured.

According to the second aspect of the present invention, when the control system is electrically insulated from the power supply source by the transformer, the command signal is output. If a photocoupler is provided between the switch and the switch, even if the switch is electrically connected to the power supply, the control system is electrically connected to the power supply via the switch. Since the connection is not performed, it is possible to reliably ensure the electrical insulation of the control system from the power supply source.

Furthermore, according to the third aspect of the present invention, when the control system is electrically insulated from the power supply source by the voltage transforming means, the electromagnetic coil is not used. By electrically insulating the power supply side by the second transformer, there is no need to separately provide a configuration for electrically insulating the electromagnetic coil and the control system.
It is possible to ensure the electrical insulation of the control system from the power supply source.

According to the fourth aspect of the present invention, when the energization and the stop of the electromagnetic coil are achieved by a mechanical relay, the energization of the electromagnetic coil is performed at a low voltage. Even at high currents, cadmium silver oxide has excellent welding resistance, which prevents welding of relay contacts, prolongs the contact life and suppresses the increase in running costs due to contact replacement. .

According to the fifth aspect of the present invention, when the energization of the electromagnetic coil and the stop thereof are achieved by the mechanical relay, the energization of the electromagnetic coil is performed at a high voltage. Even if the current is low, the high hardness of silver tungsten prevents sticking and transfer of the contact target to the contact side, prolongs the contact life, and suppresses the increase in running costs due to contact replacement. Become.

According to the sixth aspect of the present invention, when the energization and the stop of the electromagnetic coil are achieved by the mechanical relay, the energization and the stop of the electromagnetic coil are performed. Even in situations where arcing is likely to occur due to chattering or other factors when contacting or separating the relay contacts, silver nickel is excellent in discharging large currents. , It is possible to suppress an increase in running cost due to contact replacement.

Further, according to the flow path switching valve drive device in the refrigeration cycle according to the present invention, even if a back electromotive force is generated in the electromagnetic coil when the electromagnetic coil is energized and stopped. Since the back electromotive force is absorbed by the rectifying action of the diode bridge, it is possible to prevent the generation of noise due to the back electromotive force and the consumption of peripheral circuit components due to the influence.

Further, according to the flow path switching valve driving device in the refrigeration cycle according to the present invention, when the electromagnetic coil is energized and stopped, a back electromotive force is generated in the electromagnetic coil, which causes a surge. Even if a current is generated, the surge current is suppressed by the surge current suppressing means and does not exist as noise in the circuit, so that it is possible to prevent the consumption of peripheral circuit components due to the influence of the noise. .

According to the ninth aspect of the present invention, the electric circuit of the power supply system for supplying the driving power from the power supply source to the electromagnetic coil has an overcurrent. In the case where the electromagnetic coil has fallen into a state, it is possible to prevent the electromagnetic coil from abnormally generating heat and burning due to the overcurrent state.

Further, according to the flow path switching valve driving apparatus in the refrigeration cycle according to the present invention, for example, the insulation of the windings constituting the electromagnetic coil is reduced due to the deterioration of the insulation film, etc. When the electromagnetic coil falls into a state in which a current higher than the normal value can flow, the current exceeding the normal value is prevented from actually flowing to the electromagnetic coil by the overcurrent protection means. In addition, it is possible to prevent a failure or the like from occurring in peripheral electric components as well.

Further, according to the flow path switching valve drive device in the refrigeration cycle according to the present invention described in claim 11,
In particular, alternating current noise generated by components that operate on alternating current and picked up by the circuit, and high-frequency spike-like noise generated by chattering and the like when the electromagnetic coil is energized or stopped, have an electrostatic capacitance between them. Since the power supply is reduced by the two stranded power lines to function as a capacitor having the above, it is possible to prevent a failure or the like from occurring not only in the electromagnetic coil itself but also in peripheral electric components.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flow path switching valve driving device in a refrigeration cycle according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a refrigeration cycle of a cooling / heating unit to which a flow path switching valve drive device according to the present invention is applied. The refrigeration cycle indicated by reference numeral 1 in FIG. By operation, the discharge port of the compressor A is connected to one of the indoor heat exchanger C and the outdoor heat exchanger E provided with the throttle valve D interposed therebetween, and the suction port is connected to the other. On the contrary, two states can be formed: a state in which the suction port of the compressor A is connected to one of the indoor heat exchanger C and the outdoor heat exchanger E, and a discharge port to the other. It is configured as follows.

FIG. 2 is a cross-sectional view showing a schematic configuration of a rotary type four-way valve usable as the flow path switching valve B. In FIG.
Hereinafter, abbreviated as a four-way valve) has, for example, a cylindrical valve housing 4 having one end opened by deep drawing of stainless steel or the like. The main valve element 5 is accommodated so as to rotate and reciprocate in the rotation axis direction.

The open end of the valve housing 4 is closed by a valve seat 7, and a plunger 9 is inserted into the valve housing 4 from the closed end side so as to be able to reciprocate in the rotation axis direction of the main valve body 5. And the valve housing 4
An electromagnetic coil 11 is attached to the closed end side of the valve housing 4, and a magnetic pole member 13 that magnetizes to a polarity corresponding to the energization direction by energization of the electromagnetic coil 11 is provided at an outer circumferential surface portion of the valve housing 4 that is 180 ° out of phase. Each is arranged.

As shown in the bottom view of FIG. 3, the valve seat 7 has a rotary shaft hole 7a formed in the center thereof. Portions 7b and 7c of the high pressure side and the low pressure side, and both first and second switching ports 7d and 7e are formed independently of each other.

A coupling pipe 21 to 27 is attached to each of the ports 7b to 7e, and as shown in an explanatory view of FIG.
Of the first switching port 7d on the discharge side of the compressor A, and the joint pipe 23 of the low pressure side port 7c on the suction side of the compressor A.
Is connected to the indoor heat exchanger C, and the joint pipe 27 of the second switching port 7e is connected to the outdoor heat exchanger E.

On the end face of the main valve body 5 on the valve seat 7 side, two communication grooves 5a and 5b for the high pressure side and the low pressure side are formed independently of each other. In the rotational position, the high-pressure side communication groove 5a connects the high-pressure side port 7b to the second switching port 7e, and the low-pressure side communication groove 5b connects the low-pressure side port 7c and the first switching port 7d. Thus, a circulation path in the cooling mode in which the refrigerant flows through the compressor A → the four-way valve 3 → the outdoor heat exchanger E → the throttle valve D → the indoor heat exchanger C → the four-way valve 3 → the compressor A is formed.

On the other hand, at the second rotational position of the main valve element 5, as shown in the explanatory view of FIG. 5, the high pressure side port 7b and the first switching port 7d are communicatively connected by the high pressure side communication groove 5a. At the same time, the low-pressure side port 7
c and the second switching port 7e are connected to communicate with each other, and the refrigerant flows through the compressor A → the four-way valve 3 → the indoor heat exchanger C → the throttle valve D → the outdoor heat exchanger E → the four-way valve 3 → the compressor A. A circulation path in the flowing heating mode is formed.

As shown in FIG. 2, a pilot passage extending in the center of the main valve element 5 on the side of the electromagnetic coil 11 along the rotation axis direction and thereafter communicating with the low pressure side communication groove 5b. 5c is formed, and a multi-pole magnet 5d in which N poles and S poles are alternately arranged in the circumferential direction of the main valve body 5 is provided in a portion of the main valve body 5 near the electromagnetic coil 11; A passage 15 with a slight gap is defined between the inner periphery of the valve housing 4 and the outer periphery of the main valve body 5 in a state housed in the valve housing 4.

The thus formed four-way valve 3 is connected to the high pressure side communication groove 5a from the joint pipe 21 via the high pressure side port 7b.
High-pressure refrigerant from the discharge port of the compressor A flowing into the passage 15 is guided to the passage 15 through a gap (not shown) provided between the main valve body 5 and the valve seat 7, and passes through the passage 15, The main valve element 5 is introduced into the space 4a closer to the electromagnetic coil 11 than the main valve element 5 of the valve housing 4, and the pressure of the high-pressure refrigerant in the space 4a causes the main valve element 5 to move.
Are biased toward the valve seat 7 side.

The four-way valve 3 reciprocates the plunger 9 by energizing and stopping the electromagnetic coil 11, whereby the needle valve 9 a at the tip of the plunger 9 opens and closes the pilot passage 5 c of the main valve body 5. Pilot passage 5
When c is opened, the high-pressure refrigerant introduced into the space 4a becomes
Through the pilot passage 5c, the low pressure side communication groove 5b, the low pressure side port 7c, and the joint pipe 23, it flows out to the suction port of the compressor A, and the space 4a is lower than the refrigerant pressure in the high pressure side communication groove 5a.
Refrigerant pressure becomes lower, the main valve body 5
The buoyancy to one side is generated.

Further, the four-way valve 3 causes the magnetic pole member 13 to be magnetized to a polarity corresponding to the direction of the energization by energizing the electromagnetic coil 11, and the magnetic action between the multipolar magnet 5 d of the main valve element 5 and the magnetic pole member 13. , Between the first rotation position and the second rotation position.

In other words, taking the above into account, the four-way valve 3 floats away from the valve seat 7 by opening the pilot passage 5c upon energization of the electromagnetic coil 11 so that the main valve body 5 The main valve body is rotated by the pressure of the high-pressure refrigerant in the space 4a by closing the pilot passage 5c due to rotation from one of the rotation position and the second rotation position to the other and then stopping the energization of the electromagnetic coil 11. 5 is urged toward the valve seat 7 side, and the main valve body 5 is moved to the valve seat 7 while maintaining the current rotational position, that is, one of the first rotational position and the second rotational position. It is configured to perform a series of valve switching operations of being pressed.

When the main valve body 5 at one of the first rotational position and the second rotational position is pressed against the valve seat 7, the power supply to the electromagnetic coil 11 is stopped. However, the main valve body 5 is held at the current rotational position by the pressure of the high-pressure refrigerant in the space 4a.

Reference numeral 17 in FIG. 2 denotes a rotation shaft which is fitted into the rotation shaft hole 7a of the valve seat 7 and whose tip is inserted into the shaft hole 5e of the main valve body 5.

Next, the drive of the flow path switching valve according to the first embodiment of the present invention for driving the four-way valve 3 having the above-described schematic configuration and used as the flow path switching valve B of the refrigeration cycle 1 of FIG. The schematic configuration of the device will be described with reference to the circuit diagram of FIG.

The flow path switching valve driving device (hereinafter abbreviated as driving device) of the first embodiment, which is indicated by reference numeral 31 in FIG.
The single-phase 200V commercial AC power is full-wave rectified by a rectifier 33 using a diode bridge and smoothed by a smoothing capacitor 35, and the generated DC power is supplied to the first to fourth four transistors TR1, TR3, TR5, and TR7. By changing the non-conductivity, either the forward direction indicated by a solid line arrow in FIG. 6 or the reverse direction indicated by a dotted line arrow in FIG. 6 is passed through the positive power line L + and the negative power line L−. It is configured to flow through the electromagnetic coil 11 in such a direction.

The driving device 31 transforms the DC power generated by smoothing by the smoothing capacitor 35 by a DC / DC converter 37 (corresponding to a transforming means) and supplies the transformed DC power to a microcomputer 39. When the microcomputer 39 (corresponding to a control system and a command signal output means) operated by the controller outputs two kinds of command signals according to the switching direction when the four-way valve 3 performs the valve switching operation, the command signal The signal is input to the driver circuit 43 via the coupler 41, and the first to fourth four transistors TR
Transistor TR1, TR3, TR5, TR7 corresponding to the type of the command signal among the transistors TR1, TR3, TR5, TR7
By supplying a bias signal from the driver circuit 43 to the base, the power supply to the electromagnetic coil 11 in the forward or reverse direction or the stop thereof is performed as described above.

More specifically, in the normal state in which no command signal is output, the microcomputer 39 sets the signal levels of both the upper and lower signal lines in FIG. 6 to low level.

Then, no bias signal is output from the driver circuit 43 to the bases of any of the transistors TR1, TR3, TR5, and TR7, so that all the transistors TR1, TR3, TR5, and TR7 become non-conductive and become electromagnetic. The coil 11 is not energized, and the main valve body 5 is urged toward the valve seat 7 so that the main valve body 5 remains in the first or second rotational position.

Next, when a command signal for instructing mode switching from the cooling mode to the heating mode is output in a state where the main valve body 5 is held at the first rotational position by itself, the microcomputer 39
6, the signal level of the upper signal line in FIG. 6 is kept at the high level for a predetermined time, and the signal level of the lower signal line is kept at the low level.

Then, a bias signal is output from the driver circuit 43 to each of the second transistor TR3 and the third transistor TR5 for a predetermined time. During that time, the second transistor TR3 and the third transistor TR5 are brought into a conductive state, and electromagnetic waves are generated. DC power is supplied to the coil 11 for a predetermined time in a forward direction indicated by a solid arrow in FIG.

Thus, the above-described pilot passage 5c
The valve switching operation in which the four-way valve 3 rotates from the first rotation position to the second rotation position is performed by the floating and rotation of the main valve body 5 due to the opening of the valve, and the subsequent pressure contact with the valve seat 7, The refrigeration cycle 1 switches from the cooling mode shown in FIG. 4 to the heating mode shown in FIG.

On the other hand, when the command signal for instructing the mode switching from the heating mode to the cooling mode is output while the main valve body 5 is held at the second rotational position by itself, the microcomputer 39
Sets the signal level of the upper signal line in FIG. 6 to the low level and sets the signal level of the lower signal line to the high level.

Then, a bias signal is output from the driver circuit 43 to each of the first transistor TR1 and the fourth transistor TR7 for a certain period of time. During that time, the first transistor TR1 and the fourth transistor TR7 are in a conductive state, and the DC power is supplied to the coil 11 in a reverse direction indicated by a dotted arrow in FIG. 6 for a predetermined time.

Thus, the above-described pilot passage 5c
The valve switching operation in which the four-way valve 3 rotates from the second rotation position to the first rotation position is performed by the floating and rotation of the main valve body 5 accompanying the opening of the valve body, and the subsequent pressure contact with the valve seat 7. The refrigeration cycle 1 switches from the heating mode shown in FIG. 5 to the cooling mode shown in FIG.

As is clear from the above description, in the first embodiment, the power supply source in the claims is a rectifier 3
3 and a smoothing capacitor 35. The first to fourth transistors TR1, TR3, TR5
TR7 corresponds to the switch means in the claims.

By the way, the driving device 3 which performs the above-described operation
In 1, there are two wirings for the microcomputer 39, one for the DC / DC converter 37 for power supply and one for the photocoupler 41 for transmitting command signals.

In the wiring for the DC / DC converter 37, a transformer (not shown) in the DC / DC converter 37 electrically insulates the microcomputer 39 with respect to the rectifier 33 side. In the wiring for the coupler 41, the light emitting diode LD and the phototransistor P
The microcomputer 3 for the driver circuit 43 side by TR
Nine electrical insulations are provided.

As described above, according to the driving device 31 of the first embodiment, the DC power generated by the rectifier 33 or the like from the single-phase 200 V commercial AC power is converted into the first to fourth four transistors TR1, TR3, TR5. , TR7, the conduction and non-conduction states are appropriately set to flow the electromagnetic coil 11 of the four-way valve 3 or to stop the flow of the DC power to the electromagnetic coil 11 as follows. did.

That is, the microcomputer 39, which operates by receiving the supply of the DC power generated by the rectifier 33 and the like, operates the first to fourth transistors TR1, TR3, TR5, TR7.
In controlling the conductive and non-conductive states of the rectifier 33,
The photocoupler 41 electrically insulates the driver circuit 43 and the microcomputer 39 electrically connected to the
DC power from the rectifier 33 is supplied to the DC / DC converter 3
7, the voltage is changed and supplied to the microcomputer 39.

For this reason, the first to fourth transistors T
Even if the driver circuit 43 to which the command signal output from the microcomputer 39 for controlling the conduction and non-conduction state of R1, TR3, TR5 and TR7 is electrically connected to the rectifier 33, the driver circuit 43 The microcomputer 39 is completely electrically insulated from the rectifier 33 side by electrically insulating the microcomputer 39 from the rectifier 33 side, so that even if noise occurs on the rectifier 33 side, the noise is reduced. By preventing transmission to the microcomputer 39, malfunction of the microcomputer 39 due to noise can be prevented, and normal operation of the refrigeration cycle 1 can be stably and reliably ensured.

In the first embodiment, the case where the commercial AC power is single-phase 200 V has been described.
Even when the commercial AC power is three-phase 200V, the rectifier 3
Needless to say, the driving device can be configured by a circuit configuration similar to that shown in FIG. 6 except that three phases are required for three phases.

Further, even when the commercial AC power is single-phase 100 V, the driving device has the same circuit configuration as that shown in FIG. 6 except that a known voltage doubler rectifier circuit is used instead of the rectifier 33. Further, when the commercial AC power is single-phase 100 V, if the rectifier 33 is used, the voltage of the obtained DC power is 125 V.
Except for the following points, it is a matter of course that the driving device can be configured with the same circuit configuration as that shown in FIG.

Next, a schematic configuration of a driving device according to a second embodiment of the present invention will be described with reference to a circuit diagram of FIG.

The driving device according to the second embodiment, which is indicated by reference numeral 51 in FIG.
4 between the positive power supply line L + and the negative power supply line L− for supplying power to the power supply line 1 so as to allow a current flow from the negative power supply line L− to the positive power supply line L +. Bridge 5 consisting of two diodes
3 are connected so as to straddle, and two connection points α and β which are not connected to either the positive power line L + or the negative power line L− among the connection points between the diodes.
In addition, the configuration is different from that of the driving device 31 of the first embodiment in that one end and the other end of the electromagnetic coil 11 are connected, and the other points are the same as those of the power supply device 31 of the first embodiment. It is configured similarly.

According to the driving device 51 of the second embodiment configured as described above, the same effects as those of the driving device 31 of the first embodiment can be obtained.
Even when a back electromotive force is generated in the electromagnetic coil 11 when the power is supplied to the power supply and when the power supply is stopped, the electromagnetic coil 11 straddles between the positive power supply line L + and the negative power supply line L−, both ends of which are connected. In the diode bridge 53, the back electromotive force of the electromagnetic coil 11 is absorbed by the rectifying action, so that it is possible to prevent the generation of spike noise due to the back electromotive force and the consumption of peripheral circuit components due to the influence. Further effects can be obtained.

If the diode bridge 53 is constituted by a high-speed switching diode instead of a normal diode, a spike-like shape is generated due to the back electromotive force generated in the electromagnetic coil 11 when the electromagnetic coil 11 is energized and stopped. Even if noise occurs, it absorbs that noise better,
Thus, it is possible to more effectively prevent the peripheral circuit components from being consumed due to the influence of noise.

Next, a schematic configuration of a driving device according to a third embodiment of the present invention will be described with reference to a circuit diagram of FIG.

The driving device according to the third embodiment indicated by reference numeral 61 in FIG. 8 converts the DC power from the rectifier 33 into the second DC / DC power.
The first embodiment is different from the first embodiment in that the DC converter 63 (corresponding to a second transformer) transforms the voltage and supplies it to the electromagnetic coil 11 and the command signal from the microcomputer 39 is directly input to the driver circuit 43. Drive 3 in form
1 is different from that of the first embodiment, and the other points are the same as those of the driving device 31 of the first embodiment.

In the driving device 61 according to the third embodiment thus configured, the wiring for the microcomputer 39 is different from the wiring for the DC / DC converter 37 for supplying power, and the first to fourth transistors TR1 and TR3. , TR5, T
R7 for the driver circuit 43 for driving the conduction and non-conduction of R7.

Among them, the wiring for the driver circuit 43 different from the driving device 31 of the first embodiment is the same as the second DC circuit existing between the driver circuit 43 and the rectifier 33 side.
In the transformer (not shown) in the / DC converter 63, the microcomputer 39 is electrically insulated from the rectifier 33 side, and the wiring for the DC / DC converter 37 similar to the drive device 31 of the first embodiment is This DC
In a transformer (not shown) in the / DC converter 37, the microcomputer 39 is electrically insulated from the rectifier 33 side.

According to the driving device 61 of the third embodiment configured as described above, the microcomputer 39 is completely driven from the rectifier 33 side by the transformer in the DC / DC converter 37 and the transformer in the second DC / DC converter 63. Therefore, even if noise is generated on the rectifier 33 side, this noise is prevented from being transmitted to the microcomputer 39 to prevent the microcomputer 39 from malfunctioning due to the noise. Operation can be stably and reliably ensured.

In addition, the driving device 61 of the third embodiment
According to the second DC / DC converter 63, the DC power from the rectifier 33 is transformed into a voltage corresponding to the microcomputer 39.
Is also used as a means for electrically insulating the microcomputer 39 from the rectifier 33 side.
1, a dedicated configuration for electrically insulating the microcomputer 39 from the rectifier 33 side, such as the photocoupler 41, is not required, and the circuit configuration can be simplified and the cost can be reduced accordingly. Further effects can be obtained.

Incidentally, like the driving device 71 according to the fourth embodiment of the present invention shown in the circuit diagram of FIG. 9, the driving device 61 of the third embodiment is used in the driving device 51 of the second embodiment. It is also possible to adopt a configuration in which the diode bridge 53 is added.

With such a configuration, the same effect as that of the driving device 61 of the third embodiment can be obtained, and in addition, when the electromagnetic coil 11 is energized and stopped, Even if a back electromotive force is generated in the power supply line 11, the positive side power supply line L
Since the back electromotive force of the electromagnetic coil 11 is absorbed by the rectifying action in the diode bridge 53 straddling between the + and the negative power line L-, the spike noise is generated by the back electromotive force and the surrounding area is affected by the influence. The same effect as that of the driving device 51 of the second embodiment, which can prevent the occurrence of wear and the like of circuit components, can be obtained.

Next, a schematic configuration of a driving device according to a fifth embodiment of the present invention will be described with reference to the circuit diagram of FIG.

The drive device according to the fifth embodiment, which is indicated by reference numeral 81 in FIG. 10, performs direct-current power generated by full-wave rectification by the rectifier 33 and smoothing by the smoothing capacitor 35 to generate an inverter switch circuit in the preceding stage of the compressor A. 83 and the microcomputer 3
The drive device 61 according to the third embodiment is different from the drive device 61 according to the third embodiment in that the DC power supply 9 and the electromagnetic coil 11 are configured to supply DC power of individual voltages corresponding to the respective voltages transformed by a single third DC / DC converter 85. The configuration is different, and the other points are the same as those of the driving device 61 of the third embodiment.

In the driving device 81 of the fifth embodiment configured as described above, the wiring for the microcomputer 39 is different from the wiring for the third DC / DC converter 85 for supplying power and the first to fourth transistors TR 1 and TR 1. TR3, TR
5 and a driver circuit 43 for driving the conduction and non-conduction of TR7.

Among them, the third DC / DC converter 85
, The third DC / DC converter 85
In the transformer (not shown) inside, the microcomputer 39 is electrically insulated from the rectifier 33 side, and the wiring for the driver circuit 43 is connected between the driver circuit 43 and the rectifier 33 side. 3DC / D
In the C converter 85, the microcomputer 39 is electrically insulated from the rectifier 33 side.

According to the driving device 81 of the fifth embodiment configured as described above, the microcomputer 39 is completely electrically insulated from the rectifier 33 by the transformer in the third DC / DC converter 85. Even if noise occurs on the 33 side, this noise is prevented from being transmitted to the microcomputer 39 to prevent the malfunction of the microcomputer 39 caused by the noise, and to ensure the normal operation of the refrigeration cycle 1 stably and reliably. Can be.

Further, the driving device 81 of the fifth embodiment
According to the above, the path of the power supply system to the microcomputer 39,
First to fourth transistors TR1, TR3, TR5,
It exists on both paths of the control system of the TR 7 and transforms the DC power from the rectifier 33 into two kinds of voltages, a voltage corresponding to the microcomputer 39 and a voltage corresponding to the electromagnetic coil 11, and these microcomputers A single third DC / DC converter 85 supplied to each of the 39 and the electromagnetic coil 11 is also used as a means for electrically insulating the microcomputer 39 from the rectifier 33 side.

For this reason, a special configuration for electrically insulating the microcomputer 39 from the rectifier 33 side, such as the photocoupler 41 in the driving device 31 of the first embodiment, is not required, and the circuit configuration is correspondingly reduced. It is possible to obtain a further effect similar to that of the driving device 61 of the third embodiment, that is, the simplification and the cost reduction can be achieved.

Incidentally, like the driving device 91 according to the sixth embodiment of the present invention shown in the circuit diagram of FIG. 11, the driving device 81 of the fifth embodiment is used in the driving device 51 of the second embodiment. It is also possible to adopt a configuration in which the diode bridge 53 is added.

In the case of such a configuration, when energizing the electromagnetic coil 11 and stopping it, the electromagnetic coil 1
1, even if a back electromotive force is generated in the diode bridge 53 connected between the positive power line L + and the negative power line L−, both ends of the electromagnetic coil 11 are connected.
Since the back electromotive force of the electromagnetic coil 11 is absorbed by the rectifying action, the generation of spike noise due to the back electromotive force and the consumption of peripheral circuit components due to the influence can be prevented. Further effects similar to those of the driving device 51 can be obtained.

In each of the fifth and sixth embodiments described above, the DC power generated by full-wave rectification by the rectifier 33 and smoothing by the smoothing capacitor 35 is further converted to the third DC power.
After being transformed by the / DC converter 85, the DC power is supplied to the microcomputer 39 and the electromagnetic coil 11 respectively, while the DC power without being transformed is supplied to the inverter switch circuit 8 in the preceding stage of the compressor A.
3 was supplied.

That is, the DC power generated to be supplied to the inverter switch circuit 83 at the preceding stage of the compressor A is transformed into a necessary voltage by the microcomputer 39 and the electromagnetic coil 11 and distributed to these.

However, in practicing the present invention,
The configuration in which the DC power generated by full-wave rectification by the rectifier 33 and smoothed by the smoothing capacitor 35 is supplied to the inverter switch circuit 83 in the preceding stage of the compressor A is not an essential configuration, and therefore, this configuration is omitted. Of course, it is possible.

Next, a schematic configuration of a driving device according to a seventh embodiment of the present invention will be described with reference to a circuit diagram of FIG.

The driving device according to the seventh embodiment indicated by reference numeral 101 in FIG. 12 is the same as the driving device 51 according to the second embodiment described above.
Among the circuits connected to the rectifier 33 via the positive power line L + and the negative power line L−,
A full bridge driver (hereinafter, referred to as an H switch) 103 is used in place of the circuit portion excluding the smoothing capacitor 35, and energization, stoppage, and energization of the electromagnetic coil 11 are adjusted in accordance with the H switch 103. A microcomputer 10 that outputs a command signal for a direction in a different form
5 (corresponding to a control system and command signal output means)
The configuration is different from that of the driving device 51 of the second embodiment in that it is used in place of the driving device 9, and the other configuration is the same as that of the power supply device 51 of the second embodiment.

In FIG. 12, the illustration of the rectifier 33, the smoothing capacitor 35, and the DC / DC converter 37 shown in the circuit diagram of the driving device 51 of the second embodiment in FIG. 7 is omitted.

Then, as the H switch 103,
For example, a bipolar linear integrated circuit manufactured by Toshiba Corporation (part number: TA8440H) can be used. The internal configuration of the H switch 103 having the part number TA8440H is as shown in the circuit diagram of FIG.

That is, the H switch 103 has 1
First and second two Darlington-connected two pnp transistors and two npn transistors
A set of switching circuits SWC1 and SWC3 and two n
a third and a fourth set of switching circuits SWC5, SC connected in Darlington connection by combining with a pn transistor
It has a WC 7 and a diode bridge 103a in which four diodes are bridge-connected, similar to the diode bridge 53 employed in the drive device 51 of the second embodiment.

The detailed description of the connection structure inside the H switch 103 is omitted, but the H switch 103
When a low-level enable signal is input from the enable terminal ENABLE to the decoder DEC operated by the power supplied from the control power supply terminal Vcc, the decoder DEC does not matter regardless of the input signal level of the forward / reverse switching terminal IN.
Has four amplifiers AMP1, AMP3, AMP5 and AM
P7 through the first to fourth switching circuits SWC
1, SWC3, SWC5, and SWC7 are all configured to output a low-level control signal.

Therefore, in this state, the first through fourth
Switching circuits SWC1, SWC3, SWC5,
SWC7 becomes non-conductive, and H switch 10
3, the output side power supply terminal Vs and the power ground terminal PG are not connected to any of the non-inversion output terminal OUT + and the inversion output terminal OUT-.

The H switch 103 is connected to the decoder DE.
C is a high-level enable signal and the enable terminal EN
When the input signal level of the forward / reverse switching terminal IN is at a high level in a state where the signal is input from the ABLE, a high-level control signal is sent to the first and fourth switching circuits SWC1 and SWC7 via the amplifiers AMP1 and AMP7. And outputs the second and third switching circuits SWC3 and SWC via the remaining amplifiers AMP3 and AMP5.
5 is configured to output a low-level control signal.

Therefore, in this state, the first and fourth
Of the second and third switching circuits SWC1 and SWC7 are both conductive.
C3 and SWC5 are both in a non-conductive state, whereby
The output side power supply terminal Vs is connected to the non-inversion output terminal OUT +, and the power ground terminal PG is connected to the inversion output terminal OUT−.
Connected to.

Further, the H switch 103 is connected to the decoder D
A high-level enable signal is applied to EC at the enable terminal E.
When the input signal level of the forward / reverse switching terminal IN is at a low level in a state where the signal is input from the NABLE, a low-level control signal is sent to the first and fourth switching circuits SWC1 and SWC7 via the amplifiers AMP1 and AMP7. And the second and third switching circuits SWC3, SWC via the remaining amplifiers AMP3, AMP5.
It is configured to output a high-level control signal to C5.

Therefore, in this state, the second and third
Of the first and fourth switching circuits SWC3 and SWC5 are both turned on.
Both C1 and SWC7 become non-conductive, thereby
The output side power supply terminal Vs is connected to the inverted output terminal OUT−, and the power ground terminal PG is connected to the non-inverted output terminal OUT +.
Connected to.

The above-described diode bridge 103a
The connection point between the cathodes of the two diodes is connected to the output side power supply terminal Vs, and the connection point between the anodes of the two diodes is connected to the power ground terminal PG.

One of the two connection points where one diode and the anode of the diode bridge 103a are connected to the cathode of the other diode is connected to the emitter of the first stage npn transistor of the first switching circuit SWC1 and the third node. A connection point between the collector of the first stage npn transistor of the switching circuit SWC5 and the non-inverting output terminal O
Each is connected to UT +.

Further, one of the two connection points where one diode and the anode of the diode bridge 103a are connected to the cathode of the other diode is connected to the emitter of the first stage npn transistor of the second switching circuit SWC3. Npn of first stage of fourth switching circuit SWC7
It is connected to a connection point with the collector of the transistor and an inversion output terminal OUT-.

In FIG. 13, reference numeral TSD denotes a thermal cutoff circuit for protecting the H switch 103.

In the driving device 101 of the seventh embodiment using the H switch 103 described above, the positive power line L + is connected to the output power terminal Vs of the H switch 103 as shown in FIG. One of the two phototransistors PTR1 and PTR3 of the coupler 41 is connected to the forward / reverse switching terminal IN, the other is connected to the enable terminal ENABLE, and both ends of the electromagnetic coil 11 are forward and reverse output terminals OUT + and OUT−. And are connected to each other.

The H switch 103 operates by receiving supply of power generated by the bias voltage generation power supply BV connected to the positive power supply line L + from the control power supply terminal Vcc. The ground terminal PG is grounded.

Further, a bipolar linear integrated circuit (product number: TA8440H) manufactured by Toshiba Corp.
In the case of using as 3, the rated voltage of the output side power supply terminal Vs is 50V, so it is desirable that the voltage of the DC power generated on the rectifier 33 side be within 50V.

In the driving device 101, in the normal state where no command signal is output, the microcomputer 105 sets the signal levels of both the upper and lower signal lines in FIG. 12 to low level.

Then, in the H switch 103, since a low-level enable signal is input to the decoder DEC from the enable terminal ENABLE, the first to fourth signals are output.
Switching circuits SWC1, SWC3, SWC5,
SWC7 becomes non-conductive, and the non-inverting output terminal O
Both ends of the electromagnetic coil 11 connected to the UT + and the inverted output terminal OUT- are not connected to either the output side power supply terminal Vs or the power ground terminal PG, and the electromagnetic coil 11 is not energized.

Accordingly, the main valve element 5 is biased toward the valve seat 7 and is kept in a state of being self-held at the first or second rotational position.

Next, in the state where the main valve element 5 is held at the first rotational position by itself, the microcomputer 105 outputs a command signal for instructing a mode switch from the cooling mode to the heating mode.
Sets the signal levels of both the upper and lower signal lines in FIG. 12 to the high level.

Then, in the H switch 103, a high-level enable signal is input from the enable terminal ENABLE to the decoder DEC, and a high-level signal is input from the forward / reverse switching terminal IN to the decoder DEC. One end of the electromagnetic coil 11 connected to the output terminal OUT + is connected to the output side power supply terminal Vs,
The other end of the electromagnetic coil 11 connected to the inverted output terminal OUT− is connected to the power ground terminal PG,
12, DC power is supplied for a predetermined time in a forward direction indicated by a solid arrow in FIG.

As a result, the above-described pilot passage 5c
The valve switching operation in which the four-way valve 3 rotates from the first rotation position to the second rotation position is performed by the floating and rotation of the main valve body 5 due to the opening of the valve, and the subsequent pressure contact with the valve seat 7, The refrigeration cycle 1 switches from the cooling mode shown in FIG. 4 to the heating mode shown in FIG.

On the other hand, when the command signal for instructing the mode switching from the heating mode to the cooling mode is output while the main valve body 5 is held at the second rotational position by itself, the microcomputer 105
Sets the signal level of the upper signal line in FIG. 12 to the low level and sets the signal level of the lower signal line to the high level.

In the H switch 103, a high-level enable signal is input from the enable terminal ENABLE to the decoder DEC, and a low-level signal is input from the forward / reverse switching terminal IN to the decoder DEC. One end of the electromagnetic coil 11 connected to the force terminal OUT + is connected to the power ground terminal PG,
The other end of the electromagnetic coil 11 connected to the inverted output terminal OUT− is connected to the output side power supply terminal Vs,
Then, DC power is supplied for a predetermined time in the reverse direction indicated by the dotted arrow in FIG.

As a result, the above-described pilot passage 5c
The valve switching operation in which the four-way valve 3 rotates from the second rotation position to the first rotation position is performed by the floating and rotation of the main valve body 5 due to the opening of the valve and the subsequent pressure contact with the valve seat 7, The refrigeration cycle 1 switches from the heating mode shown in FIG. 5 to the cooling mode shown in FIG.

As is apparent from the above description, in the seventh embodiment, the first to fourth switching circuits SWC1, SWC3, SWC5, S
WC7 corresponds to the switch means in the claims.

According to the driving device 101 of the seventh embodiment configured as described above, the H switch for inputting the command signal output by the microcomputer 105 to control the energization of the electromagnetic coil 11, the stop thereof, and the energizing direction. Even when the switch 103 is electrically connected to the rectifier 33, the microcomputer 105 is completely electrically isolated from the rectifier 33 by electrically insulating the H switch 103 and the microcomputer 105 from each other by the photocoupler 41. As a result, even if noise occurs on the rectifier 33 side, this noise
Microcomputer 1 caused by noise
05, which prevents malfunctions of the refrigeration cycle 1 and ensures normal operation of the refrigeration cycle 1 stably.
Further effects similar to those of the driving device 51 of the embodiment can be obtained.

Further, according to the driving device 101 of the seventh embodiment, even if a back electromotive force is generated in the electromagnetic coil 11 when the electromagnetic coil 11 is energized and stopped, the electromagnetic coil 1
1. Both ends of the non-inverting output terminal OUT + and the inverting output terminal OUT
The back electromotive force of the electromagnetic coil 11 is absorbed by the rectifying action in the diode bridge 103a inside the H switch 103 connected to-and the peripheral circuit due to the generation of spike noise due to the back electromotive force and its influence. The same effect as that of the driving device 51 of the second embodiment, which can prevent the occurrence of parts consumption and the like, can be obtained.

Next, a schematic configuration of a driving device according to an eighth embodiment of the present invention will be described with reference to the circuit diagram of FIG.

The drive device of the eighth embodiment indicated by reference numeral 111 in FIG. 14 is the same as the drive device 71 of the fourth embodiment described above.
In the above, an H switch 103 is used in place of the circuit portion connected to the second DC / DC converter 63, and a microcomputer 105 is used in place of the microcomputer 39 in accordance with the H switch 103. The configuration is different from that of the drive device 71 of the fourth embodiment, and the other points are the same as those of the drive device 71 of the fourth embodiment.

In FIG. 14, the rectifier 33, the smoothing capacitor 35, the DC / DC converter 37, and the second DC / DC converter 63 shown in the circuit diagram of the driving device 71 of the fourth embodiment in FIG. Illustration is omitted.

In the driving device 111 of the eighth embodiment, the H switch 103 is connected to the driving device 10 of the seventh embodiment.
In this case, instead of the power generated by the bias voltage generation power supply BV, the DC power after the DC / DC converter 37 is supplied from the control power supply terminal Vcc to operate.

According to the driving device 111 of the eighth embodiment configured as described above, the transformer in the DC / DC converter 37 and the transformer in the second DC / DC converter 63 completely control the microcomputer 105 from the rectifier 33 side. Therefore, even if noise is generated on the rectifier 33 side, this noise is prevented from being transmitted to the microcomputer 105 to prevent the microcomputer 105 from malfunctioning due to the noise. The same effect as that of the driving device 61 of the third embodiment, in which the operation can be stably and reliably ensured, can be obtained.

In addition, the driving device 11 of the eighth embodiment
According to 1, the DC power from the rectifier 33 is
DC / DC converter 6 for transforming to a voltage corresponding to 5
3 is also used as a means for electrically insulating the microcomputer 105 from the rectifier 33 side, so that the microcomputer 105 and the rectifier 33 side such as the photocoupler 41 in the driving device 101 of the seventh embodiment are electrically connected. A special configuration for insulation is not required, and a further effect similar to that of the driving device 61 of the third embodiment can be obtained, in that the circuit configuration can be simplified and the cost can be reduced accordingly.

Further, according to the driving device 111 of the eighth embodiment, even if a back electromotive force is generated in the electromagnetic coil 11 when the electromagnetic coil 11 is energized and stopped, both ends of the electromagnetic coil 11 are positive. Inverted output terminal OUT + and inverted output terminal OU
In the diode bridge 103a inside the H switch 103 connected to T−, the back electromotive force of the electromagnetic coil 11 is absorbed by the rectifying action, so that spike noise is generated by the back electromotive force and the surrounding area is affected by the effect. The same effect as that of the driving device 101 of the seventh embodiment, which can prevent the occurrence of wear and the like of circuit components, can be obtained.

The above-described H switch 103 is similar to the driving devices 101 and 111 of the seventh and eighth embodiments, but is similar to the driving devices 51 and 71 of the second and fourth embodiments.
Of the circuit connected to the third DC / DC converter 85 in the driving device 91 of the sixth embodiment.
It is also possible to use in place of the circuit part except for.

In this case, a microcomputer 105 is used in place of the microcomputer 39 in accordance with the H switch 103. The microcomputer 105 controls the supply of the DC power after the transformation by the third DC / DC converter 85 to the control power supply. It operates by receiving from the terminal Vcc.

In the case of such a configuration, since the microcomputer 105 is completely electrically insulated from the rectifier 33 by the transformer in the third DC / DC converter 85, noise is generated on the rectifier 33 side. Even in the fifth embodiment, this noise is prevented from being transmitted to the microcomputer 105 to prevent malfunction of the microcomputer 105 caused by the noise, and to ensure the normal operation of the refrigeration cycle 1 stably. Form of driving device 8
The same effect as that of No. 1 can be obtained.

In addition, in the case of such a configuration, the path of the power supply system to the microcomputer 105 and the path of the power supply system to the H switch 103 for energizing and stopping the electromagnetic coil 11 and switching the energizing direction are different. And the DC power from the rectifier 33
A single third DC / DC converter 85 that converts the voltage into two types of voltage, that is, the voltage corresponding to the microcomputer 5 and the voltage corresponding to the electromagnetic coil 11, and supplies the voltage to the microcomputer 105 and the electromagnetic coil 11, respectively. It is also used as a means for electrical insulation with the 33 side.

For this reason, the driving device 101 of the seventh embodiment
A special configuration for electrically insulating the microcomputer 105 from the rectifier 33 side, such as the photocoupler 41, is not required, and the circuit configuration can be simplified and the cost can be reduced accordingly. Further effects similar to those of the driving device 81 of the fifth embodiment can be obtained.

Next, a schematic configuration of a drive device according to a ninth embodiment of the present invention will be described with reference to the circuit diagram of FIG.

The driving apparatus according to the ninth embodiment indicated by reference numeral 121 in FIG. 15 is a DC power generated by performing full-wave rectification of single-phase 200 V commercial AC power by a rectifier 33 using a diode bridge and smoothing by a smoothing capacitor 35. By changing the open / close state of the first and second changeover switches SW1 and SW3, the forward direction indicated by the solid arrow in FIG. 15 can be obtained through the positive power line L + and the negative power line L−. 15, and flows in the electromagnetic coil 11 in one of the opposite directions indicated by dotted arrows in FIG.

The driving device 121 converts the DC power generated by smoothing with the smoothing capacitor 35 into the fourth DC / D
The microcomputer 1 is transformed by the C converter 123 and supplied to the microcomputer 125, and is operated by the DC power after the transformation.
25 (corresponding to control system and command signal output means)
Output a command signal in accordance with the switching direction when the first switch switch SW is operated.
1 and SW3, the first and second operation coils CL1 and CL3 respectively corresponding to the first and second switches SW3 and SW3 are appropriately excited.
By changing the switching state of the corresponding first and second changeover switches SW1 and SW3 with the second operation coils CL1 and CL3, the above-described energization of the electromagnetic coil 11 in the forward or reverse direction is achieved. Or, it is configured to stop it.

The first changeover switch SW1 includes a normally open contact a connected to the positive power line L +, a normally closed contact b connected to the negative power line L-,
1 and a switching contact c connected to one end of the first power supply line L +.
, A normally closed contact b connected to the negative power supply line L-, and a switching contact c connected to the other end of the electromagnetic coil 11.

In the driving device 121 of the ninth embodiment configured as described above, in the normal state where no command signal is output, the microcomputer 125 operates the first and second operating coils CL.
Neither 1 nor CL3 is energized.

Then, both the switching contacts c of the first and second changeover switches SW1 and SW3 remain connected to the normally closed contact b as shown in FIG. Is not performed, and the main valve element 5 is urged toward the valve seat 7 to be in a state of being held at the first or second rotational position by itself.

Next, when the main valve 5 is self-maintained at the first rotational position, the microcomputer 125 outputs a command signal for instructing a mode switch from the cooling mode to the heating mode.
Keeps energizing the first operating coil CL1 for a predetermined period of time while not energizing the second operating coil CL3.

Then, while the switching contact c of the second switch SW3 is connected to the normally closed contact b, the energized first operating coil CL1 is excited, and accordingly, the switching contact of the first switch SW1 is switched. 15 is connected to the normally open contact a for a predetermined time, DC power is supplied to the electromagnetic coil 11 in the forward direction indicated by the solid arrow in FIG. 15 for a predetermined time.

As a result, the above-described pilot passage 5c
The valve switching operation in which the four-way valve 3 rotates from the first rotation position to the second rotation position is performed by the floating and rotation of the main valve body 5 due to the opening of the valve, and the subsequent pressure contact with the valve seat 7, The refrigeration cycle 1 switches from the cooling mode shown in FIG. 4 to the heating mode shown in FIG.

On the other hand, when the command signal for instructing the mode switching from the heating mode to the cooling mode is output while the main valve body 5 is held at the second rotational position by itself, the microcomputer 125
Performs power supply to the second operation coil CL3 for a predetermined time without power supply to the first operation coil CL1.

Then, while the switching contact c of the first switch SW1 is connected to the normally closed contact b, the energized second operating coil CL3 is excited, and accordingly, the switching contact of the second switch SW3 is excited. Since the contact c is connected to the normally open contact a for a predetermined time, DC power is supplied to the electromagnetic coil 11 in a reverse direction indicated by a dotted arrow in FIG. 15 for a predetermined time.

As a result, the above-described pilot passage 5c is
The valve switching operation in which the four-way valve 3 rotates from the second rotation position to the first rotation position is performed by the floating and rotation of the main valve body 5 accompanying the opening of the valve body, and the subsequent pressure contact with the valve seat 7. The refrigeration cycle 1 switches from the heating mode shown in FIG. 5 to the cooling mode shown in FIG.

By the way, the driving device 1 performing the above-described operation
In 21, the wiring for the microcomputer 125 is for the fourth DC / DC converter 123 for supplying power, and the first and second operations for switching operation of the first and second changeover switches SW1 and SW3. Coil CL1, CL3
And two types.

Among them, the fourth DC / DC converter 12
3, the fourth DC / DC converter 1
In a transformer (not shown) inside the microcomputer 23, the microcomputer 125 is electrically insulated from the rectifier 33 side, and the first and second operation coils CL1 and CL3
, The operation coils CL1, CL
3 and corresponding first and second changeover switches S
Between the W1 and SW3, the microcomputer 125 is electrically insulated from the first and second changeover switches SW1 and SW3.

As described above, the driving device 121 of the ninth embodiment is used.
According to the rectifier 33 from the single-phase 200V commercial AC power,
The DC power generated by the above method is supplied to the electromagnetic coil 11 of the four-way valve 3 by appropriately changing the switching state of the first and second changeover switches SW1 and SW3, or the DC power is supplied to the electromagnetic coil 11. Rectifier 33 to stop
The first and second changeover switches S are operated by the microcomputer 125 which operates by receiving the transformed power obtained by transforming the DC power generated by the fourth DC / DC converter 123 by the DC / DC converter 123.
In controlling the switching state of W1 and SW3, the following configuration was adopted.

That is, the first and second operation coils CL are connected between the microcomputer 125 and the first and second changeover switches SW1 and SW3 electrically connected to the rectifier 33.
1, CL3 and the corresponding first and second changeover switches SW1, SW3, and the DC power from the rectifier 33 is supplied to the fourth DC / DC converter 12
3, the voltage is changed and supplied to the microcomputer 125.

Therefore, the microcomputer 125 controls the first and second changeover switches SW1, SW3 for controlling the changeover state.
Are electrically connected to the rectifier 33, the first and second changeover switches SW1 and SW3 and the microcomputer 125
The microcomputer 125 is completely electrically insulated from the rectifier 33 side by electrically insulating the microcomputer 125 with the first and second operation coils CL1 and CL3, thereby generating noise on the rectifier 33 side. Even if it does, this noise is prevented from being transmitted to the microcomputer 125, thereby preventing a malfunction of the microcomputer 125 caused by the noise and stably ensuring the normal operation of the refrigeration cycle 1.

In the ninth embodiment, the case where the commercial AC power is single-phase 200 V has been described.
Even when the commercial AC power is three-phase 200V, except that the full-wave rectifier circuit 35 is required for three phases, the driving device can be configured with the same circuit configuration as that shown in FIG. Needless to say.

The normally open contact a, normally closed contact b, and first and second changeover switches SW1 and SW3 of the first and second switches SW1 and SW3 described above.
As the switching contact c, for example, silver cadmium oxide, silver tungsten, silver nickel, or the like can be used.

If cadmium silver oxide is used for each of the contacts a, b, and c, the contact resistance is excellent.
Even if the current supplied to the electromagnetic coil 11 is low voltage and high current, welding of the contacts a, b and c can be prevented, the contact life can be extended, and an increase in running cost due to contact replacement can be suppressed.

If silver tungsten is used for each of the contacts a, b and c, the magnetic coil 1 has high hardness.
Even if the current to 1 is a high voltage and a low current, it is possible to prevent the contact and transfer to the contacts a, b, and c sides of the contact object, prolong the contact life, and suppress an increase in running cost due to contact replacement. it can.

Further, when silver nickel is used for each of the contacts a, b, and c, the discharge performance of a large current is excellent.
When the contacts a, b, and c for energizing and stopping the electromagnetic coil 11 are in contact with and separated from each other, even if arc discharge is likely to occur due to chattering or the like, the arc between the contacts a, b, and c is not affected. Occurrence of the contact can be prevented, the life of the contact can be prolonged, and an increase in running cost due to contact replacement can be suppressed.

The driving devices 31, 51, 61, 71, 81, 91, and 10 of the first to ninth embodiments described above.
1, 111, 121, and all the driving devices in which the H switch 103 is diverted to the driving device 91 of the sixth embodiment like the driving devices 101, 111 of the seventh and eighth embodiments. 16 to 21, a varistor Vd is connected in parallel with the electromagnetic coil 11, or a series circuit RC of the resistor and the capacitor is connected to the electromagnetic coil 11.
And the thermal fuse H
t, the positive temperature coefficient thermistor Rt, the current fuse Ha, and the current limiting resistor Ra may be connected in series.

If the varistor Vd shown in FIG. 16 and the series circuit RC of the resistor and the capacitor shown in FIG. 17 are connected in parallel with the electromagnetic coil 11, when the electromagnetic coil 11 is energized and stopped, the electromagnetic coil 11 Even if a back electromotive force is generated and becomes a surge current, the surge current is suppressed by the varistor Vd and the series circuit RC of the resistor and the capacitor, and the driving devices 31, 51, 61, 71, 81, 91, 1
Since the noise does not exist in 01, 111, and 121, it is advantageous because it is possible to prevent the peripheral components of the electromagnetic coil 11 from being consumed particularly by the influence of the noise.

As is clear from the above description, the varistor Vd and the resistor-capacitor series circuit RC described above are used.
Corresponds to the surge current suppressing means in the claims, and the surge current suppressing means is not limited to the varistor Vd or the series circuit RC of the resistor and the capacitor. If the element or the circuit can suppress the surge current, Instead of a varistor Vd or a resistor-capacitor series circuit RC, this is replaced with an electromagnetic coil 11.
The same effect can be obtained by connecting in parallel.

If the thermal fuse Ht shown in FIG. 18 and the positive temperature coefficient thermistor Rt shown in FIG. 19 are connected in series with the electromagnetic coil 11, the positive power supply line L + and the negative power supply line L- fall into an overcurrent state. In this case, it is possible to prevent the electromagnetic coil 11 from abnormally generating heat and burning due to the overcurrent state, which is advantageous.

In particular, according to the positive temperature coefficient thermistor Rt, there is no fusing like the thermal fuse Ht.
It is more advantageous than the thermal fuse Ht.

As is clear from the above description, the above-described thermal fuse Ht and the positive temperature coefficient thermistor Rt correspond to the thermal protection means in the claims. The temperature fuse Ht and the positive temperature coefficient thermistor Rt are not limited to the temperature fuse Ht and the positive temperature coefficient thermistor Rt. The same effect can be obtained.

However, it is needless to say that it is preferable that one end of the electromagnetic coil 11 is provided in contact with the other end in an electrically insulated state so that the temperature of the electromagnetic coil 11 can be accurately picked up.

Furthermore, if the current fuse Ha shown in FIG. 20 and the current limiting resistor Ra shown in FIG. 21 are connected in series with the electromagnetic coil 11, for example, the insulation of the windings constituting the electromagnetic coil 11 can be reduced by using an insulating film. If the current drops due to deterioration or the like and the electromagnetic coil 11 falls into a state where a current higher than the normal value can flow, a current higher than the normal value is actually supplied to the electromagnetic coil 11 by the current fuse Ha and the current limiting resistor Ra. This is advantageous because it is possible to prevent a failure or the like from occurring not only in the electromagnetic coil 11 itself but also in the surrounding electric components.

The current fuse Ha is connected to the electromagnetic coil 1
1 responds relatively quickly to the overcurrent state, so that there is an advantage that reliability such as failure prevention can be further improved. On the other hand, the current limiting resistor Ra allows the current flowing through the electromagnetic coil 11 to return to a normal value. For example, since it returns to the original state, it is not necessary to replace it as in the case of the current fuse Ha after it has been blown, and there is an advantage in that it can save labor and time for replacing parts and replacement parts.

As is clear from the above description, the above-mentioned current fuse Ha and current limiting resistor Ra correspond to the overcurrent protection means in the claims. It is not limited to Ha and the current limiting resistor Ra, but any element or circuit that limits and protects excessive current flowing through the electromagnetic coil 11 may be replaced with the current fuse Ha or the current limiting resistor Ra. The same effect can be obtained by connecting in series.

The driving devices 31, 51, 61, 71, 81, 91, and 10 of the first to ninth embodiments described above.
1, 111, 121 and all the driving devices in which the H switch 103 is diverted to the driving device 91 of the sixth embodiment like the driving devices 101 and 111 of the seventh and eighth embodiments. Lead wires 11a and 11b (corresponding to power supply wires) from both ends of the electromagnetic coil 11 of the valve 3 may be twisted with each other to form a stranded wire as shown in the explanatory view of FIG.

Then, by doing so, both lead wires 1
The gap between 1a and 11b functions as a capacitor having an electrostatic capacity. In particular, AC noise or electromagnetic noise generated from a component that operates on an alternating current in the device and picked up by the wiring of the device can be obtained. High frequency spike noise generated due to chattering or the like when the coil 11 is energized or stopped is absorbed and reduced by the capacitor between the lead wires 11a and 11b. This is advantageous because a failure or the like can be prevented from occurring in the component.

Further, each of the transistors used for switching in each of the above-described embodiments may be replaced with a MOS transistor except for those in the H switch 103 which is integrated.

In this case, for switching, generally, in the case of a transistor, an npn-type bipolar transistor is used on the negative electrode side, and an npn-type bipolar transistor or a pnp-type bipolar transistor is used on the positive electrode side. Is an n-channel type M on the negative electrode side.
An OS-FET and an n-channel type MOS-FET or a p-channel type MOS-FET are used on the positive electrode side. In any case, in the decoder DEC, an appropriate logic is used according to the target of an element used for switching. Of course, the appropriate processing is performed.

Further, in each of the above-described embodiments, the case where the rotary type four-way valve 3 shown in FIG. 2 is used as the flow path switching valve B has been described. Regardless of whether a unique configuration for holding the switching position is added or not as disclosed in FIG. 4 of Japanese Unexamined Patent Publication No. 9-72633, a valve element generally called a linear type is provided with a valve. In a refrigeration cycle in which a four-way valve that switches a flow path by sliding on a sheet is used as a flow path switching valve B, it is needless to say that the present invention can be widely applied as a device for driving this kind of flow path switching valve. .

[0169]

As described above, according to the flow path switching valve drive device in the refrigeration cycle according to the first aspect of the present invention, the flow path of the refrigerant in the refrigeration cycle is changed into one flow path by energizing the electromagnetic coil. A device for driving a flow path switching valve that switches to another flow path from a power supply source that supplies driving power to the electromagnetic coil, and operates by receiving the driving power supply from the power supply source. The connection of the power supply source to the electromagnetic coil and the control system for commanding insulation are electrically insulated.

For this reason, when the energization to the electromagnetic coil is started to switch the flow path of the refrigerant in the refrigeration cycle from one flow path to another flow path, or when the energization is stopped upon completion of the switching, Even if noise is generated on the power supply side of the driving power, this noise is not transmitted to the control system that is electrically insulated from the power supply source. A malfunction does not occur due to the accompanying noise, so that a normal operation of the refrigeration cycle can be stably ensured.

Further, according to the second aspect of the present invention, the power supply source is provided through the switch means for opening and closing the circuit in response to an external command signal. Connected to the electromagnetic coil, the control system operates upon receiving the supply of the transformed power from the power supply source and transformed by the transforming means for transforming the driving power, and the control system Has command signal output means for outputting the command signal to the switch means, and a photocoupler interposed between the command signal output means and the switch means; and The power supply source and the control system are electrically insulated.

For this reason, if the control system is electrically insulated from the power supply source side by the transformer means, if a photocoupler is provided between the command signal output means and the switch means,
Even if the switch means is electrically connected to the power supply source, the control system is not electrically connected to the power supply source via the switch means. Electrical insulation can be reliably ensured.

Further, according to the third aspect of the present invention, the control system is transformed by the transformation means for transforming the driving power from the power supply source. The second transformed electric power, which is operated by receiving the transformed electric power and is operated by the second coil transforming means for transforming the driving electric power from the electric power supply source into the electromagnetic coil, is supplied to the refrigerant flow path. The power supply source and the control system are electrically insulated by the transforming means and the second transforming means.

For this reason, when the control system is electrically insulated from the power supply source by the transformer, the electromagnetic coil is electrically insulated from the power supply by the second transformer so that the electromagnetic coil is electrically isolated from the power supply. The electrical insulation of the control system from the power supply source can be reliably ensured without separately providing a configuration for electrically insulating the control system from the control system.

According to the fourth aspect of the present invention, the power supply source is connected to a mechanical relay that opens and closes a circuit in response to an external command signal. And the contact of the mechanical relay is made of silver cadmium oxide.

For this reason, when energization and stoppage of the electromagnetic coil are achieved by a mechanical relay, even if the energization of the electromagnetic coil is a low voltage and a high current, the silver cadmium oxide has excellent welding resistance. In addition, it is possible to prevent welding of the relay contacts, prolong the contact life, and suppress an increase in running costs due to contact replacement.

According to a fifth aspect of the present invention, in the refrigeration cycle, the power supply source is connected to a mechanical relay that opens and closes the circuit in response to an external command signal. And the contact of the mechanical relay is made of silver tungsten.

For this reason, when energizing the electromagnetic coil and stopping it by a mechanical relay, even if energizing the electromagnetic coil is a high voltage and a low current, the silver tungsten has a high hardness. Adhesion transfer to the contact side can be prevented, the contact life can be prolonged, and an increase in running cost due to contact replacement can be suppressed.

Further, according to the flow path switching valve driving device in the refrigeration cycle according to the present invention, the power supply source is connected via a mechanical relay that opens and closes the circuit in response to an external command signal. And the contact of the mechanical relay is formed of silver nickel.

For this reason, when energizing and stopping the electromagnetic coil is achieved by a mechanical relay, a situation in which arc discharge is likely to occur due to chattering or the like at the time of contact and separation of the relay contact for energizing and stopping the electromagnetic coil. Even so, since silver nickel is excellent in discharging large current, it is possible to prevent occurrence of arc between contacts, prolong contact life, and suppress increase in running cost due to contact replacement.

Further, according to the flow path switching valve driving device in the refrigeration cycle according to the present invention, the positive power supply line and the negative power supply for supplying the driving power to the electromagnetic coil as a direct current. The power supply source further includes a diode bridge provided on the cathode side of the power supply source, and the electromagnetic coil includes an anode of one of the diodes constituting the diode bridge and another of the diodes. The connection point with the cathode is provided so as to extend between two connection points that are not electrically connected to either the positive electrode side or the negative electrode side of the power supply source.

For this reason, even if a back electromotive force is generated in the electromagnetic coil when the electromagnetic coil is energized and stopped, the back electromotive force is absorbed by the rectifying action of the diode bridge. It is possible to prevent the generation of noise and the consumption of peripheral circuit components due to its influence.

According to the flow path switching valve driving apparatus for a refrigeration cycle according to the present invention, the power supply source is further provided with a surge current suppressing means connected in parallel with the electromagnetic coil. The configuration was adopted.

Therefore, even if a back electromotive force is generated in the electromagnetic coil when the electromagnetic coil is energized and stopped, and this becomes a surge current, this surge current is suppressed by the surge current suppressing means and is included in the circuit. Since it does not exist as noise, it is possible to prevent the peripheral circuit components from being consumed due to the influence of the noise.

Further, according to the ninth aspect of the present invention, the flow path switching valve driving device in the refrigeration cycle further comprises a thermal protection means connected in series with the electromagnetic coil to the power supply source. The configuration was adopted.

Therefore, when the electric circuit of the power supply system for supplying the driving power from the power supply source to the electromagnetic coil falls into an overcurrent state, the electromagnetic coil is abnormally heated and burns out due to the overcurrent state. Can be prevented.

According to the tenth aspect of the present invention, there is provided a flow path switching valve driving device in a refrigeration cycle according to the present invention, further comprising an overcurrent protection means connected in series with the electromagnetic coil to the power supply source. The configuration was adopted.

Therefore, for example, when the insulation of the windings constituting the electromagnetic coil is reduced due to deterioration of the insulating film and the like, and the electromagnetic coil can flow a current higher than a normal value, The overcurrent protection means prevents a current of a normal value or more from actually flowing through the electromagnetic coil, thereby preventing the electromagnetic coil itself as well as peripheral electric components from causing a failure or the like. .

Further, according to the flow path switching valve driving device in the refrigeration cycle according to the present invention described in claim 11,
The power supply device further includes two power supply lines connected to both ends of the electromagnetic coil to supply the driving power, and the two power supply lines are twisted to function as a capacitor having a capacitance therebetween. It was configured as a line.

For this reason, in particular, AC noise generated by components operating on AC and picked up by the circuit, and high frequency spike noise generated by chattering or the like when the electromagnetic coil is energized or stopped, Since it is reduced by two stranded power lines to function as a capacitor having a capacitance between them, it is possible to prevent failures and the like from occurring not only in the electromagnetic coil itself but also in peripheral electric components. it can.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a refrigeration cycle of a cooling and heating unit to which a flow path switching valve drive device according to the present invention is applied.

FIG. 2 is a cross-sectional view showing a schematic configuration of a rotary four-way valve that can be used as the flow path switching valve in FIG.

FIG. 3 is a bottom view of the rotary four-way valve of FIG. 2;

FIG. 4 is an explanatory diagram showing a state during a cooling operation when the rotary four-way valve of FIG. 2 is incorporated as a flow path switching valve into the refrigeration cycle of FIG. 1;

5 is an explanatory diagram showing a state during a heating operation when the rotary four-way valve of FIG. 2 is incorporated into the refrigeration cycle of FIG. 1 as a flow path switching valve.

6 shows a first embodiment of the present invention for driving the rotary four-way valve of FIG. 2 used as a flow path switching valve in the refrigeration cycle of FIG. 1;
1 is a circuit diagram illustrating a schematic configuration of a flow path switching valve driving device according to an embodiment.

7 is a second embodiment of the present invention for driving the rotary four-way valve of FIG. 2 used as a flow path switching valve in the refrigeration cycle of FIG. 1;
1 is a circuit diagram illustrating a schematic configuration of a flow path switching valve driving device according to an embodiment.

FIG. 8 is a third embodiment of the present invention for driving the rotary four-way valve of FIG. 2 used as a flow path switching valve in the refrigeration cycle of FIG. 1;
1 is a circuit diagram illustrating a schematic configuration of a flow path switching valve driving device according to an embodiment.

FIG. 9 is a fourth embodiment of the present invention for driving the rotary four-way valve of FIG. 2 used as a flow path switching valve in the refrigeration cycle of FIG. 1;
1 is a circuit diagram illustrating a schematic configuration of a flow path switching valve driving device according to an embodiment.

10 is a circuit diagram showing a schematic configuration of a flow path switching valve driving device according to a fifth embodiment of the present invention that drives the rotary four-way valve of FIG. 2 used as a flow path switching valve in the refrigeration cycle of FIG. .

11 is a circuit diagram showing a schematic configuration of a flow path switching valve drive device according to a sixth embodiment of the present invention for driving the rotary four-way valve of FIG. 2 used as a flow path switching valve in the refrigeration cycle of FIG. .

12 is a circuit diagram illustrating a schematic configuration of a flow path switching valve driving device according to a seventh embodiment of the present invention that drives the rotary four-way valve of FIG. 2 used as the flow path switching valve in the refrigeration cycle of FIG. .

FIG. 13 is a circuit diagram showing an internal configuration of a full bridge driver used in the driving device of FIG.

14 is a circuit diagram showing a schematic configuration of a flow path switching valve driving device according to an eighth embodiment of the present invention for driving the rotary four-way valve of FIG. 2 used as a flow path switching valve in the refrigeration cycle of FIG. .

15 is a circuit diagram showing a schematic configuration of a flow path switching valve driving device according to a ninth embodiment of the present invention for driving the rotary four-way valve of FIG. 2 used as a flow path switching valve in the refrigeration cycle of FIG. .

FIG. 16 is a main part circuit diagram showing a state in which a varistor applicable to each of the first to ninth embodiments is connected in parallel with an electromagnetic coil.

FIG. 17 is a main part circuit diagram showing a state where a series circuit of a resistor and a capacitor applicable to each of the first to ninth embodiments is connected in parallel with an electromagnetic coil;

FIG. 18 is a main part circuit diagram showing a state in which a thermal fuse applicable to each of the first to ninth embodiments is connected in series with an electromagnetic coil.

FIG. 19 is a main part circuit diagram showing a state where a positive temperature coefficient thermistor applicable to each of the first to ninth embodiments is connected in series with an electromagnetic coil.

FIG. 20 is a main part circuit diagram showing a state where a current fuse applicable to each of the first to ninth embodiments is connected in series with an electromagnetic coil;

FIG. 21 is a main part circuit diagram showing a state in which a current limiting resistor applicable to each of the first to ninth embodiments is connected in series with an electromagnetic coil.

FIG. 22 is a diagram applicable to each of the first to ninth embodiments;
It is explanatory drawing which shows the lead wire from both ends of the electromagnetic coil in the rotary type four-way valve of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Refrigeration cycle 3 Rotary type four-way valve (flow-path switching valve) 11 Electromagnetic coil 11a, 11b Lead wire (power supply wire) 31, 51, 61, 71, 81, 91, 101, 11
1, 121 flow path switching valve driving device 33 rectifier (power supply source) 35 smoothing capacitor (power supply source) 37 DC / DC converter (transformation means) 39 microcomputer (control system, command signal output means) 41 photocoupler 53, 103a Diode bridge 63 Second DC / DC converter (second transformer) 105, 125 Microcomputer (control system, command signal output means) Ha Current fuse (overcurrent protection means) Ht Temperature fuse (thermal protection means) L + Positive electrode side Power line L- Negative power line RC Series resistor-capacitor series circuit (surge current suppression means) Ra Current limiting resistor (overcurrent protection means) Rt Positive thermistor (thermal protection means) SW1 First switch (mechanical relay) SW3 2nd switch (mechanical relay) SWC1 1 switching circuit (switch means) SWC3 second switching circuit (switch means) SWC5 third switching circuit (switch means) SWC7 fourth switching circuit (switch means) TR1 first transistor (switch means) TR3 second transistor (switch means) TR5 Third transistor (switch means) TR7 Fourth transistor (switch means) Vd Varistor (surge current suppressing means) α, β diode bridge connection point a normally open contact (contact) b normally closed contact (contact) c switching contact )

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuo Sugita 535 Sasai, Sayama City, Saitama Prefecture Inside the Sayama Works Sayama Works, Ltd. (72) Inventor Mitsuaki Noda 535 Sasai, Sayama City, Saitama Prefecture Inside the Sayama Works, Sayama Works ( 72) Inventor Kazuto Aihara 535 Sasai, Sayama-shi, Saitama Pref.Sagimiya Manufacturing Co., Ltd.Sayama Works (72) Inventor Noboru Nakagawa 535 Sasai, Sayama-shi Saitama Pref. 535 Sasai, Sayama City, Saitama Prefecture Sagimiya Manufacturing Co., Ltd.Sayama Plant (72) Inventor Toshihiro Teranishi 535 Sasai City, Sayama City, Saitama Prefecture Saginomiya Manufacturing Co., Ltd. Sagimiya Works Sayama Works

Claims (11)

[Claims] 1. An apparatus for driving a flow path switching valve for switching a flow path of a refrigerant in a refrigeration cycle from one flow path to another flow path by energizing an electromagnetic coil, wherein driving power is supplied to the electromagnetic coil. A power supply source to supply;
A refrigeration system that operates upon receiving the drive power from the power supply source and is electrically insulated from a control system that commands connection and insulation of the power supply source to the electromagnetic coil. A flow path switching valve driving device in a cycle. 2. The power supply source is connected to the electromagnetic coil via switch means that opens and closes a circuit in response to a command signal from the outside, and the control system is configured to control the power supply source from the power supply source. The control system operates by receiving the supply of the transformed power transformed by the transformer for transforming the driving power, and the control system includes command signal output means for outputting the command signal to the switch means. 2. The power supply source and the control system are electrically insulated from each other by a photocoupler provided between the command signal output unit and the switch unit and the transformer. Flow path switching valve driving device in the refrigerating cycle of the present invention. 3. The control system operates upon receiving a supply of transformed power from the power supply source by a transforming means for transforming the driving power, and the electromagnetic coil includes a power supply source. The second transformed power that is transformed by the second transforming means for transforming the driving power from is supplied with electricity when the flow path of the refrigerant is switched, and the power is transformed by the transforming means and the second transforming means. The drive device according to claim 1, wherein a supply source and the control system are electrically insulated from each other. 4. The power supply source is connected to the electromagnetic coil via a mechanical relay that opens and closes a circuit in response to an external command signal, and a contact of the mechanical relay is formed of cadmium silver oxide. Claim 3
A drive device for a flow path switching valve in the refrigeration cycle described in the above. 5. The power supply source is connected to the electromagnetic coil via a mechanical relay that opens and closes a circuit in response to a command signal from the outside, and a contact of the mechanical relay is formed of silver tungsten. The drive device for a flow path switching valve in a refrigeration cycle according to claim 3. 6. The power supply source is connected to the electromagnetic coil via a mechanical relay that opens and closes a circuit in response to a command signal from the outside, and a contact of the mechanical relay is formed of silver nickel. The drive device for a flow path switching valve in a refrigeration cycle according to claim 3. 7. A power supply is provided between a positive power supply line and a negative power supply line for supplying the driving power to the electromagnetic coil as a direct current, and a cathode is disposed on a positive side of the power supply. Further comprising a diode bridge, wherein the electromagnetic coil is a connection point between an anode of one diode and a cathode of another diode constituting the diode bridge, and is connected to either a positive electrode side or a negative electrode side of the power supply source. 1, 2, 3, 4, and 5 provided between two connection points that are not electrically connected to each other.
7. The drive device for a flow path switching valve in the refrigeration cycle according to 5 or 6. 8. A flow path in a refrigeration cycle according to claim 1, further comprising a surge current suppressing means connected in parallel with said electromagnetic coil with respect to said power supply source. Switching valve drive. 9. The refrigeration cycle according to claim 1, further comprising a thermal protection means connected in series with the electromagnetic coil with respect to the power supply source. Channel switching valve drive. 10. The refrigeration device according to claim 1, further comprising an overcurrent protection means connected in series with said electromagnetic coil with respect to said power supply source. A flow path switching valve driving device in a cycle. 11. The power supply system further comprises two power supply lines connected to both ends of the electromagnetic coil for supplying the driving power, wherein the two power supply lines have a capacitance between each other. The flow path switching valve drive device in a refrigeration cycle according to claim 1, wherein the drive circuit is a stranded wire so as to function as.