JPWO2020174687A1 - Outdoor unit of air conditioner - Google Patents

Abstract

The outdoor unit (3) has an electric circuit (50). The electric circuit (50) includes a first energization selection switch (52A), a second energization selection switch (52B), an energization on / off switch (53), a cooling / heating switching solenoid valve coil (32A), and a first defrost solenoid valve coil (52A). It has a first polarity changeover switch (54A) and a second polarity changeover switch (54B) for switching the direction of the current flowing through the 330A) and the second defrost solenoid valve coil (330B). The electric circuit (50) has a first energization selection switch (52A), a second energization selection switch (52B), an energization on / off switch (53), a first polarity changeover switch (54A), and a second polarity changeover during heating operation. A control circuit (55) that controls the switch (54B) to allow one of the first sub-heat exchanger (31A) and the second sub-heat exchanger (31B) to operate the defrost while continuing the heating operation. ) And.

Description

The present invention relates to an outdoor unit of an air conditioner that performs heating operation.

When the air conditioner performs heating operation, frost may occur in the heat exchanger of the outdoor unit. When frost is generated, the efficiency of heat exchange in the heat exchanger is reduced, so it is necessary to remove the frost. Removing frost is called defrosting. Conventionally, there is known a method in which an air conditioner temporarily interrupts a heating operation to perform a cooling operation to raise the temperature of a heat exchanger of an outdoor unit to perform defrosting. In this method, since the heat exchanger of the indoor unit acts as an evaporator, the heat of the air in the room is transferred to the refrigerant in the heat exchanger of the indoor unit, which causes a problem that the room temperature is lowered.

In order to solve the above-mentioned problems, a technique has been proposed in which the heat exchanger of the outdoor unit, which serves as an evaporator during heating, is composed of a plurality of auxiliary heat exchangers (see, for example, Patent Document 1). In this technique, the outdoor unit has a plurality of paths for guiding the refrigerant discharged from the compressor to each of the plurality of auxiliary heat exchangers, and an on-off valve for controlling the flow of the refrigerant. In this technology, when the air conditioner performs the heating operation, each of the plurality of auxiliary heat exchangers alternately defrosts the operation without reversing the refrigeration cycle from the refrigeration cycle during the heating operation to the refrigeration cycle during the cooling operation. conduct. As a result, the air conditioner can continue the heating operation while removing frost without switching from the heating operation to the cooling operation.

JP-A-2009-85484

However, a conventional air conditioner capable of simultaneously performing defrost operation and heating operation requires a plurality of solenoid valves. Patent Document 1 does not disclose means for realizing simultaneous defrost operation and heating operation with an electric circuit having a small number of parts.

In general, as the solenoid valve for switching the flow path of the refrigerant, either a constant energization type solenoid valve or a latch type solenoid valve in which energization is performed only when switching the flow path is often used. The constantly energized solenoid valve always consumes electric power during energization, whereas the latch solenoid valve consumes electric power only when the flow path is switched and energized. That is, the power consumption of the latch solenoid valve is less than that of the constantly energized solenoid valve.

However, the electric circuit that drives the latch solenoid valve is an energization switch that switches between an energization on state and an energization off state, and two polarity changeover switches for selecting the polarity of the coil that constitutes the latch solenoid valve. And need. Therefore, there arises a problem that the number of parts constituting the electric circuit increases as the number of auxiliary heat exchangers increases.

The present invention has been made in view of the above, and air conditioning realizes a function for simultaneously performing defrost operation and heating operation in an electric circuit having relatively few parts while suppressing power consumption. The purpose is to obtain an outdoor unit of the machine.

In order to solve the above-mentioned problems and achieve the object, the outdoor unit of the air conditioner according to the present invention is an outdoor unit having n auxiliary heat exchangers for heat exchange between the refrigerant and the outside air. A heat exchanger, a cooling / heating switching electromagnetic valve for switching between cooling operation and heating operation, n defrost electromagnetic valves for causing n auxiliary heat exchangers to perform defrost operation, and defrost operation and heating. It has an electric circuit for simultaneously performing operation. n is an integer of 2 or more. The electric circuit selects to energize either the cooling / heating switching solenoid valve coil included in the cooling / heating switching solenoid valve or the defrost solenoid valve coil included in each of the n defrost solenoid valves. It has a switch and an energization on / off switch that energizes any one of a cooling / heating switching solenoid valve coil and n defrost solenoid valve coils. The electric circuit consists of two polarity changeover switches that switch the direction of the current flowing through the cooling / heating switching solenoid valve coil and n defrost solenoid valve coils, and n energization selection switches, energization on / off switch, and two during heating operation. With a control circuit that controls the polarity changeover switch of the above and causes one or more of the n sub-heat exchangers and n-1 or less sub-heat exchangers to perform defrost operation while continuing the heating operation. Further has.

The outdoor unit of the air conditioner according to the present invention can realize a function for simultaneously performing defrost operation and heating operation by an electric circuit having relatively few parts while suppressing power consumption.

The figure which shows the structure of the air conditioner which concerns on Embodiment 1. The figure for demonstrating the example of the operation of the air conditioner and the flow of a refrigerant at the time when the air conditioner which concerns on Embodiment 1 performs a heating operation. The figure which shows the structure of the electric circuit which the air conditioner which concerns on Embodiment 1 has. The figure for demonstrating an example of the operation of the air conditioner and the flow of a refrigerant at the time of the air conditioner of Embodiment 1 perform a cooling operation. Operation of each of the first polarity changeover switch, the second polarity changeover switch, the first energization selection switch, the second energization selection switch, and the energization on / off switch before the air conditioner according to the first embodiment starts the execution of the heating operation. Diagram showing the timing of The figure which shows the 1st control state of the electric circuit which the air conditioner which concerns on Embodiment 1 has. Of the first polarity changeover switch, the second polarity changeover switch, the first energization selection switch, the second energization selection switch, and the energization on / off switch before the air conditioner according to the first embodiment starts executing the first operating state. The figure which shows the timing of each operation The figure which shows the 2nd control state of the electric circuit which the air conditioner which concerns on Embodiment 1 has. The figure for demonstrating the flow of the refrigerant at the time when the 1st sub-heat exchanger of the air conditioner according to Embodiment 1 performs a defrost operation and the 2nd sub-heat exchanger performs a heating operation. First polarity changeover switch, second polarity changeover switch, first energization selection switch, second energization selection when the operation state of the air conditioner according to the first embodiment switches from the first operation state to the second operation state. The figure which shows the timing of each operation of a switch and an energization on / off switch. The figure which shows the 3rd control state of the electric circuit which the air conditioner which concerns on Embodiment 1 has. The figure which shows the 4th control state of the electric circuit which the air conditioner which concerns on Embodiment 1 has. The figure for demonstrating the flow of the refrigerant at the time when the 1st sub-heat exchanger of the air conditioner according to Embodiment 1 performs a heating operation and the 2nd sub-heat exchanger performs a defrost operation. The figure which shows the structure of the air conditioner which concerns on Embodiment 2. The figure which shows the structure of the electric circuit which the air conditioner which concerns on Embodiment 2 has. The figure which shows the processor in the case where a part or all the functions of the control circuit which the air conditioner which concerns on Embodiment 1 have are realized by a processor. The figure which shows the processing circuit in the case where a part or all the functions of the control circuit which the air conditioner which concerns on Embodiment 1 have are realized by the processing circuit.

Hereinafter, the outdoor unit of the air conditioner according to the embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1.
FIG. 1 is a diagram showing a configuration of an air conditioner 1 according to the first embodiment. The air conditioner 1 has an indoor unit 2 and an outdoor unit 3. The indoor unit 2 has an indoor heat exchanger 21 for exchanging heat between the refrigerant and the air in the room. The outdoor unit 3 has an outdoor heat exchanger 31 including a first sub-heat exchanger 31A and a second sub-heat exchanger 31B for exchanging heat between the refrigerant and the outside air which is the outdoor air. The first sub-heat exchanger 31A and the second sub-heat exchanger 31B are examples of n sub-heat exchangers. n is an integer of 2 or more.

The outdoor unit 3 has a cooling / heating switching solenoid valve 32 for switching between cooling operation and heating operation, and a first defrost solenoid valve for causing the first auxiliary heat exchanger 31A and the second auxiliary heat exchanger 31B to perform defrost operation. It further has a valve 33A and a second defrost solenoid valve 33B. The cooling / heating switching solenoid valve 32, the first defrost solenoid valve 33A, and the second defrost solenoid valve 33B are all latch type solenoid valves.

The first defrost solenoid valve 33A and the second defrost solenoid valve 33B are examples of n defrost solenoid valves. Both the first defrost solenoid valve 33A and the second defrost solenoid valve 33B are solenoid valves that switch between the flow of the refrigerant when the heating operation is performed and the flow of the refrigerant when the defrost operation is performed. The first defrost solenoid valve 33A corresponds to the first secondary heat exchanger 31A, and the second defrost solenoid valve 33B corresponds to the second secondary heat exchanger 31B.

The outdoor unit 3 further includes a compressor 34 for compressing the refrigerant and an electric circuit for simultaneously performing the defrost operation and the heating operation. The electrical circuit is not shown in FIG. The details of the electric circuit will be described later.

FIG. 2 is a diagram for explaining an example of the operation of the air conditioner 1 and the flow of the refrigerant when the air conditioner 1 according to the first embodiment performs a heating operation. The arrow in FIG. 2 indicates the direction in which the refrigerant moves. When the air conditioner 1 performs the heating operation, the cooling / heating switching electromagnetic valve 32 moves the refrigerant discharged from the outdoor heat exchanger 31 to the compressor 34, and the refrigerant discharged from the compressor 34 is transferred to the indoor heat exchanger 21. Move to.

The refrigerant discharged from the indoor heat exchanger 21 branches and moves to each of the first sub-heat exchanger 31A and the second sub-heat exchanger 31B. That is, a part of the refrigerant discharged from the indoor heat exchanger 21 moves to the first secondary heat exchanger 31A, and the rest of the refrigerant discharged from the indoor heat exchanger 21 moves to the second secondary heat exchanger 31B. .. The first defrost solenoid valve 33A moves the refrigerant discharged from the first secondary heat exchanger 31A to the cooling / heating switching solenoid valve 32, and the second defrost solenoid valve 33B cools / warms the refrigerant discharged from the second secondary heat exchanger 31B. It is moved to the switching solenoid valve 32.

If frost is generated in the outdoor heat exchanger 31 during the heating operation, the efficiency of heat exchange of the outdoor heat exchanger 31 is lowered, and therefore the heating capacity of the air conditioner 1 is lowered. If frost is generated in the entire outdoor heat exchanger 31, the outdoor heat exchanger 31 cannot play a role of heat exchange, so that the air conditioner 1 needs to perform a defrost operation to remove the frost. When the defrost operation is performed, the conventional air conditioner melts and removes the frost by switching the operation from the heating operation to the cooling operation and warming the outdoor heat exchanger. In that case, the temperature of the refrigerant flowing through the indoor heat exchanger is lower than room temperature, and as a result, the room temperature is lowered.

In order to suppress a decrease in room temperature when the defrost operation is performed, the outdoor unit 3 has an electric circuit for simultaneously performing the defrost operation and the heating operation. FIG. 3 is a diagram showing a configuration of an electric circuit 50 included in the air conditioner 1 according to the first embodiment. For convenience of explanation, inside the block showing the electric circuit 50 of FIG. 3, the cooling / heating switching solenoid valve coil 32A included in the cooling / heating switching solenoid valve 32 and the first defrost solenoid valve included in the first defrost solenoid valve 33A are included. The coil 330A and the second defrost solenoid valve coil 330B included in the second defrost solenoid valve 33B are shown.

The cooling / heating switching solenoid valve coil 32A is a solenoid valve coil for operating the cooling / heating switching solenoid valve 32. The first defrost solenoid valve coil 330A is a solenoid valve coil for operating the first defrost solenoid valve 33A. The second defrost solenoid valve coil 330B is a solenoid valve coil for operating the second solenoid valve 33B. The first defrost solenoid valve coil 330A and the second defrost solenoid valve coil 330B are examples of n defrost solenoid valve coils.

The electric circuit 50 includes a rectifier circuit 51 that converts an AC voltage applied from the AC power supply 60 into a DC voltage. The electric circuit 50 has a first energization selection switch 52A and a second energization selection switch 52A that selects to energize one of the cooling / heating switching solenoid valve coil 32A, the first defrost solenoid valve coil 330A, and the second defrost solenoid valve coil 330B. It further has a selection switch 52B. The first energization selection switch 52A and the second energization selection switch 52B are examples of n energization selection switches.

The electric circuit 50 further includes an energization on / off switch 53 that energizes any one of the cooling / heating switching solenoid valve coil 32A, the first defrost solenoid valve coil 330A, and the second defrost solenoid valve coil 330B. The energization on / off switch 53 is a switch for selecting whether or not to supply the AC voltage applied from the AC power supply 60 to the rectifier circuit 51.

The electric circuit 50 further includes a first polarity changeover switch 54A and a second polarity changeover switch 54B for switching the direction of the current flowing through the cooling / heating changeover solenoid valve coil 32A, the first defrost solenoid valve coil 330A, and the second defrost solenoid valve coil 330B. Have. The first polarity changeover switch 54A and the second polarity changeover switch 54B are examples of two polarity changeover switches.

The electric circuit 50 controls the first energization selection switch 52A, the second energization selection switch 52B, the energization on / off switch 53, the first polarity changeover switch 54A, and the second polarity changeover switch 54B during the heating operation, and continues the heating operation. Further, a control circuit 55 for causing one of the first sub-heat exchanger 31A and the second sub-heat exchanger 31B to operate the defrost is further provided. Furthermore, the control circuit 55 has a first operating state in which the first sub-heat exchanger 31A is made to perform the defrost operation and the second sub-heat exchanger 31B is made to perform the heating operation, and the first sub-heat exchanger. Control is performed to realize a second operating state in which the 31A is allowed to perform the heating operation and the second sub-heat exchanger 31B is allowed to perform the defrost operation.

Regarding the open / closed state of the first energization selection switch 52A, the second energization selection switch 52B, the energization on / off switch 53, the first polarity changeover switch 54A, and the second polarity changeover switch 54B, the state shown in FIG. 3 is the initial state. Defined to be. Regarding the open / closed state of each of the first energization selection switch 52A, the second energization selection switch 52B, the energization on / off switch 53, the first polarity changeover switch 54A, and the second polarity changeover switch 54B, the state shown in FIG. 3 is off. Defined as a state.

Regarding the first energization selection switch 52A, the second energization selection switch 52B, the energization on / off switch 53, the first polarity changeover switch 54A, and the second polarity changeover switch 54B, the connection state shown in FIG. 3 is defined as the initial state. Will be done. For each of the first energization selection switch 52A, the second energization selection switch 52B, the first polarity changeover switch 54A, and the second polarity changeover switch 54B, the contacts connected to the common contacts are the contacts connected to the common contacts in FIG. Different states are defined as on states. For the energization on / off switch 53, the state in which the contacts are on is defined as the on state.

Next, the operation when the operation of the air conditioner 1 is switched from the cooling operation to the heating operation will be described. FIG. 4 is a diagram for explaining an example of the operation of the air conditioner 1 and the flow of the refrigerant when the air conditioner 1 according to the first embodiment performs a cooling operation. The arrow in FIG. 4 indicates the direction in which the refrigerant moves.

When the air conditioner 1 performs the cooling operation, the cooling / heating switching electromagnetic valve 32 moves the refrigerant discharged from the indoor heat exchanger 21 to the compressor 34, and the refrigerant discharged from the compressor 34 is the first secondary heat exchange. It is moved to the vessel 31A and the second secondary heat exchanger 31B. At that time, the first defrost solenoid valve 33A moves the refrigerant discharged from the compressor 34 and passing through the cooling / heating switching solenoid valve 32 to the first secondary heat exchanger 31A, and the second defrost solenoid valve 33B discharges from the compressor 34. Then, the refrigerant passing through the cooling / heating switching solenoid valve 32 is moved to the second auxiliary heat exchanger 31B. The refrigerant discharged from the first sub-heat exchanger 31A and the second sub-heat exchanger 31B moves to the indoor heat exchanger 21.

FIG. 5 shows a first polarity changeover switch 54A, a second polarity changeover switch 54B, a first energization selection switch 52A, and a second energization selection switch before the air conditioner 1 according to the first embodiment starts executing the heating operation. It is a figure which shows the timing of each operation of 52B and energization on / off switch 53. The first polarity changeover switch 54A, the second polarity changeover switch 54B, the first energization selection switch 52A, the second energization selection switch 52B, and the energization on / off switch 53 also have signals for controlling the operation output from the control circuit 55. Works with. The operation of the first polarity changeover switch 54A and the operation of the second polarity changeover switch 54B are the same.

The control circuit 55 outputs a signal for turning it on to the energization on / off switch 53. When the control circuit 55 outputs a signal for turning on the energization on / off switch 53, the state of the electric circuit 50 shifts to the first control state shown in FIG. FIG. 6 is a diagram showing a first control state of the electric circuit 50 included in the air conditioner 1 according to the first embodiment. The arrow in FIG. 6 indicates the direction in which the current flows.

In the first control state, the current is applied in the order of the first polarity changeover switch 54A, the first energization selection switch 52A, the cooling / heating changeover solenoid valve coil 32A, the second polarity changeover switch 54B, the rectifier circuit 51, and the first polarity changeover switch 54A. It flows. As a result, the state of the cooling / heating switching solenoid valve 32 is switched, and the air conditioner 1 performs the heating operation as described with reference to FIG.

The time when it is determined that the state of the cooling / heating switching solenoid valve 32 switches to the state when the air conditioner 1 performs the heating operation from the time when the control circuit 55 outputs the signal for turning on the energization on / off switch 53. After that, the control circuit 55 outputs a signal for turning off the power to the energization on / off switch 53. As a result, the energization of the cooling / heating switching solenoid valve coil 32A is stopped. Since the cooling / heating switching solenoid valve 32 is a latch type solenoid valve, the air conditioner 1 continues the heating operation even if the energization of the cooling / heating switching solenoid valve coil 32A is stopped. That is, compared to the case where the constantly energized solenoid valve is used for the cooling / heating switching solenoid valve 32, the energizing time of the cooling / heating switching solenoid valve 32, which is a latch type solenoid valve, is shorter, so that the air conditioner 1 uses the coil. Power consumption can be suppressed.

Next, the operation when the operation of the air conditioner 1 is switched from the heating operation to the operation in the first operating state will be described. The first operating state is an operating state in which the first sub-heat exchanger 31A is made to perform the defrost operation and the second sub-heat exchanger 31B is made to perform the heating operation. Even if the operation of the air conditioner 1 is switched from the heating operation to the operation of the first state, the state of the second auxiliary heat exchanger 31B during the heating operation continues.

FIG. 7 shows a first polarity changeover switch 54A, a second polarity changeover switch 54B, a first energization selection switch 52A, and a second before the air conditioner 1 according to the first embodiment starts execution of the first operating state. It is a figure which shows the timing of each operation of the energization selection switch 52B and the energization on / off switch 53. The control circuit 55 outputs a signal for turning it on to the first energization selection switch 52A. After a time has elapsed from the time when the control circuit 55 outputs a signal for turning on the first energization selection switch 52A to the first energization selection switch 52A, it is determined that the state of the first energization selection switch 52A is switched from the off state to the on state. The control circuit 55 outputs a signal for turning it on to the energization on / off switch 53.

When the signal for turning on the control circuit 55 is output to the energization on / off switch 53, the state of the electric circuit 50 shifts to the second control state shown in FIG. FIG. 8 is a diagram showing a second control state of the electric circuit 50 included in the air conditioner 1 according to the first embodiment. The arrow in FIG. 8 indicates the direction in which the current flows. In the second control state, the current is the first polarity changeover switch 54A, the first energization selection switch 52A, the second energization selection switch 52B, the first defrost solenoid valve coil 330A, the second polarity changeover switch 54B, the rectifier circuit 51, The flow flows in the order of the first polarity changeover switch 54A.

As a result, the state of the first defrost solenoid valve 33A is switched, and as shown in FIG. 9, the state of the refrigerant flow in the first auxiliary heat exchanger 31A is switched from the state during the heating operation to the state during the cooling operation. FIG. 9 describes the flow of the refrigerant when the first sub-heat exchanger 31A included in the air conditioner 1 according to the first embodiment performs the defrost operation and the second sub-heat exchanger 31B performs the heating operation. It is a figure for. The arrow in FIG. 9 indicates the direction in which the refrigerant moves.

As described above, when the operation of the air conditioner 1 is switched from the heating operation to the operation in the first operating state, the control circuit 55 of FIG. 8 uses a relatively high temperature and relatively high pressure refrigerant as the first secondary heat exchanger. It is moved to 31A so that the first sub-heat exchanger 31A performs the defrost operation and the second sub-heat exchanger 31B continuously performs the heating operation.

Next, the operation when the operation of the air conditioner 1 is switched from the operation in the first operating state to the operation in the second operating state will be described. As described above, the first operating state is an operating state in which the first sub-heat exchanger 31A is made to perform the defrost operation and the second sub-heat exchanger 31B is made to perform the heating operation. The second operating state is an operating state in which the first sub-heat exchanger 31A is made to perform the heating operation and the second sub-heat exchanger 31B is made to perform the defrost operation.

FIG. 10 shows a first polarity changeover switch 54A, a second polarity changeover switch 54B, and a first energization when the operation state of the air conditioner 1 according to the first embodiment switches from the first operation state to the second operation state. It is a figure which shows the timing of each operation of the selection switch 52A, the second energization selection switch 52B, and the energization on / off switch 53. The control circuit 55 outputs a signal for turning it on to the first polarity changeover switch 54A, the second polarity changeover switch 54B, and the first energization selection switch 52A.

From the time when the signal for turning on the control circuit 55 is output to the first polarity changeover switch 54A, the second polarity changeover switch 54B and the first energization selection switch 52A, the first polarity changeover switch 54A and the second polarity changeover switch After the time for determining that the states of the 54B and the first energization selection switch 52A are switched from the off state to the on state has elapsed, the control circuit 55 outputs a signal for turning on the energization on / off switch 53.

When the signal for turning on the control circuit 55 is output to the energization on / off switch 53, the state of the electric circuit 50 shifts to the third control state shown in FIG. FIG. 11 is a diagram showing a third control state of the electric circuit 50 included in the air conditioner 1 according to the first embodiment. The arrow in FIG. 11 indicates the direction in which the current flows. In the third control state, the current is the first polarity changeover switch 54A, the first defrost solenoid valve coil 330A, the second energization selection switch 52B, the first energization selection switch 52A, the second polarity changeover switch 54B, the rectifier circuit 51, The flow flows in the order of the first polarity changeover switch 54A.

As a result, the state of the first defrost solenoid valve 33A is switched, and the air conditioner 1 performs the heating operation as shown in FIG. The control circuit 55 is turned off after a time has elapsed from when the control circuit 55 outputs a signal for turning it on to the energizing on / off switch 53 and when it is determined that the state of the first defrost solenoid valve 33A is switched. A signal for causing the power to be turned on is output to the energization on / off switch 53.

The control circuit 55 is turned off after a time has elapsed from the time when the control circuit 55 outputs a signal for turning it off to the energized on / off switch 53 and the time when it is determined that the energized on / off switch 53 is switched from the on state to the off state has elapsed. A signal for making the state is output to the first polarity changeover switch 54A and the second polarity changeover switch 54B. The control circuit 55 outputs a signal for turning it on to the first energization selection switch 52A and the second energization selection switch 52B.

The control circuit 55 outputs a signal for turning on the energization on / off switch 53 for a period from when the energization on / off switch 53 is switched from the on state to the off state until the signal for turning the energization on / off switch 52B is output to the second energization selection switch 52B. The output to the first energization selection switch 52A may be continued. The control circuit 55 may output a signal for turning off to the first energization selection switch 52A during the above period, and then output a signal for turning on to the first energization selection switch 52A.

The control circuit 55 turns on the first energization selection switch 52A and the second energization selection switch 52B from the off state when the signal for turning on is output to the first energization selection switch 52A and the second energization selection switch 52B. After the time determined to switch to the state has elapsed, a signal for turning on the state is output to the energization on / off switch 53.

When the control circuit 55 outputs a signal for turning on the energization on / off switch 53, the state of the electric circuit 50 shifts to the fourth control state shown in FIG. FIG. 12 is a diagram showing a fourth control state of the electric circuit 50 included in the air conditioner 1 according to the first embodiment. The arrow in FIG. 12 indicates the direction in which the current flows. In the fourth control state, the current is the first polarity changeover switch 54A, the first energization selection switch 52A, the second energization selection switch 52B, the second defrost solenoid valve coil 330B, the second polarity changeover switch 54B, the rectifier circuit 51, The flow flows in the order of the first polarity changeover switch 54A.

As a result, the state of the second defrost solenoid valve 33B is switched, and as shown in FIG. 13, the state of the refrigerant flow in the second auxiliary heat exchanger 31B is switched from the state during the heating operation to the state during the cooling operation. FIG. 13 describes the flow of the refrigerant when the first sub-heat exchanger 31A included in the air conditioner 1 according to the first embodiment performs the heating operation and the second sub-heat exchanger 31B performs the defrost operation. It is a figure for. The arrow in FIG. 13 indicates the direction in which the refrigerant moves.

When the second sub-heat exchanger 31B performs the defrost operation and the removal of the frost generated in the second sub-heat exchanger 31B is completed, the control circuit 55 defrosts the operation of the second sub-heat exchanger 31B from the heating operation. Outputs a signal for passing a current in the direction opposite to that in the case of switching to the operation of the second defrost solenoid valve coil 330B. As a result, the state of the second defrost solenoid valve 33B is switched, and the air conditioner 1 performs the heating operation as shown in FIG.

Embodiment 2.
FIG. 14 is a diagram showing the configuration of the air conditioner 1A according to the second embodiment. The air conditioner 1A includes an indoor unit 2 and an outdoor unit 3A. The indoor unit 2 of the second embodiment is the same as the indoor unit 2 of the first embodiment. The outdoor unit 3A includes an outdoor heat exchanger 31A including a first sub-heat exchanger 31A, a second sub-heat exchanger 31B, and a third sub-heat exchanger 31C for exchanging heat between the refrigerant and the outside air. Have. The first sub-heat exchanger 31A, the second sub-heat exchanger 31B, and the third sub-heat exchanger 31C are examples of n sub-heat exchangers. The first sub-heat exchanger 31A and the second sub-heat exchanger 31B of the second embodiment are the same as the first sub-heat exchanger 31A and the second sub-heat exchanger 31B of the first embodiment.

The outdoor unit 3A defrosts the first auxiliary heat exchanger 31A, the second auxiliary heat exchanger 31B, and the third auxiliary heat exchanger 31C, and the cooling / heating switching solenoid valve 32 for switching between the cooling operation and the heating operation. It further has a first defrost solenoid valve 33A, a second defrost solenoid valve 33B, and a third defrost solenoid valve 33C for carrying out the operation. The cooling / heating switching solenoid valve 32 of the second embodiment is the same as the cooling / heating switching solenoid valve 32 of the first embodiment.

The first defrost solenoid valve 33A and the second defrost solenoid valve 33B of the second embodiment are the same as the first defrost solenoid valve 33A and the second defrost solenoid valve 33B of the first embodiment. The third defrost solenoid valve 33C is a latch type solenoid valve. The third defrost solenoid valve 33C corresponds to the third secondary heat exchanger 31C. The first defrost solenoid valve 33A, the second defrost solenoid valve 33B, and the third defrost solenoid valve 33C are examples of n defrost solenoid valves. The third defrost solenoid valve 33C is a solenoid valve that switches between the flow of the refrigerant when the heating operation is performed and the flow of the refrigerant when the defrost operation is performed.

The outdoor unit 3A further includes a compressor 34 for compressing the refrigerant, and an electric circuit for simultaneously performing the defrost operation and the heating operation. The electrical circuit is not shown in FIG. The details of the electric circuit will be described later.

FIG. 15 is a diagram showing a configuration of an electric circuit 50A included in the air conditioner 1A according to the second embodiment. For convenience of explanation, inside the block showing the electric circuit 50A of FIG. 15, the cooling / heating switching solenoid valve coil 32A, the first defrost solenoid valve coil 330A, the second defrost solenoid valve coil 330B, and the third defrost solenoid valve coil 330B are included. The third defrost solenoid valve coil 330C included in the valve 33C is shown. The third defrost solenoid valve coil 330C is a solenoid valve coil for operating the third solenoid valve 33C. The first defrost solenoid valve coil 330A, the second defrost solenoid valve coil 330B, and the third defrost solenoid valve coil 330C are examples of n defrost solenoid valve coils.

The electric circuit 50A has a rectifier circuit 51. The electric circuit 50A selects to energize any of the cooling / heating switching solenoid valve coil 32A, the first defrost solenoid valve coil 330A, the second defrost solenoid valve coil 330B, and the third defrost solenoid valve coil 330C. It further includes an energization selection switch 52A, a second energization selection switch 52B, and a third energization selection switch 52C. The first energization selection switch 52A, the second energization selection switch 52B, and the third energization selection switch 52C are examples of n energization selection switches.

The electric circuit 50A further adds an energization on / off switch 53 that energizes one of the cooling / heating switching solenoid valve coil 32A, the first defrost solenoid valve coil 330A, the second defrost solenoid valve coil 330B, and the third defrost solenoid valve coil 330C. Have. The energization on / off switch 53 is a switch for selecting whether or not to supply the AC voltage applied from the AC power supply 60 to the rectifier circuit 51.

The electric circuit 50A includes a first polarity changeover switch 54A that switches the direction of the current flowing through the cooling / heating switching solenoid valve coil 32A, the first defrost solenoid valve coil 330A, the second defrost solenoid valve coil 330B, and the third defrost solenoid valve coil 330C. It further has a second polarity selector switch 54B. The first polarity changeover switch 54A and the second polarity changeover switch 54B of the second embodiment are the same as the first polarity changeover switch 54A and the second polarity changeover switch 54B of the first embodiment.

The electric circuit 50A includes a first energization selection switch 52A, a second energization selection switch 52B, a third energization selection switch 52C, an energization on / off switch 53, a first polarity changeover switch 54A, and a second polarity changeover switch 54B during heating operation. Defrost to one or two of the first sub-heat exchanger 31A, the second sub-heat exchanger 31B, and the third sub-heat exchanger 31C while controlling and continuing the heating operation. It further has a control circuit 55A for performing operation. The control circuit 55A is used in the remaining two or one sub-heat exchangers of the first sub-heat exchanger 31A, the second sub-heat exchanger 31B, and the third sub-heat exchanger 31C during the heating operation. Let the heating operation be performed.

In the first embodiment described above, the outdoor unit 3 of the air conditioner 1 is an outdoor unit including a first secondary heat exchanger 31A and a second secondary heat exchanger 31B for heat exchange between the refrigerant and the outside air. It has a heat exchanger 31. In the second embodiment, the outdoor unit 3A of the air conditioner 1A has a first sub-heat exchanger 31A, a second sub-heat exchanger 31B, and a third sub-heat for exchanging heat between the refrigerant and the outside air. It has an outdoor heat exchanger 31D including a exchanger 31C.

As described above, the outdoor unit of the air conditioner of the present application has a heat exchanger including n auxiliary heat exchangers for performing heat exchange between the refrigerant and the outside air. The outdoor unit includes a cooling / heating switching solenoid valve for switching between cooling operation and heating operation, n defrost solenoid valves for causing n auxiliary heat exchangers to perform defrost operation, and defrost operation and heating. It has an electric circuit for simultaneously performing operation. n is an integer of 2 or more. For example, all of the cooling / heating switching solenoid valve and the n defrost solenoid valves are latch type solenoid valves. The latch solenoid valve consumes power only when the flow path is switched and energized.

The electric circuit selects to energize either the cooling / heating switching solenoid valve coil included in the cooling / heating switching solenoid valve or the defrost solenoid valve coil included in each of the n defrost solenoid valves. It has a selection switch. The electric circuit further includes an energization on / off switch for energizing any one of the cooling / heating switching solenoid valve coil and the n defrost solenoid valve coils.

The electric circuit further includes a cooling / heating switching solenoid valve coil and two polarity changeover switches for switching the direction of the current flowing through the n defrosted solenoid valve coils. The electric circuit controls n energization selection switches, energization on / off switches and two polarity changeover switches during the heating operation, and one of the n sub-heat exchangers while continuing the heating operation. It further has a control circuit for causing more than one or less than n-1 auxiliary heat exchangers to operate the defrost.

Furthermore, the control circuit of the present application controls n energization selection switches, energization on / off switches and two polarity changeover switches during heating operation, and one or more of the n subheat exchangers. It has a function of causing n-1 or less sub-heat exchangers to perform defrost operation and causing one or more of the n sub-heat exchangers to perform heating operation. Examples of the control circuit are the control circuit 55 and the control circuit 55A.

As described above, for example, all of the cooling / heating switching solenoid valve and the n defrost solenoid valves are latch type solenoid valves. Generally, one latch solenoid valve requires an energization on / off switch for switching energization on and off, and two polarity changeover switches for switching the direction of the flowing current. As can be understood from the description of the first embodiment and the second embodiment, in the present application, as the number of latch solenoid valves increases, the number of energization on / off switches increases, but the number of polarity changeover switches is 2. It does not increase as it is.

Therefore, the outdoor unit of the air conditioner of the present application can realize the function of simultaneously performing the defrost operation and the heating operation with an electric circuit that suppresses power consumption and has a relatively small number of parts.

A part of the cooling / heating switching solenoid valve and the n defrost solenoid valves of the present application may be latch type solenoid valves. Even in that case, the air conditioner of the present application can suppress the consumption of electric power and simultaneously perform the defrost operation and the heating operation.

FIG. 16 is a diagram showing a processor 91 when a part or all of the functions of the control circuit 55 included in the air conditioner 1 according to the first embodiment are realized by the processor 91. That is, some or all of the functions of the control circuit 55 may be realized by the processor 91 that executes the program stored in the memory 92. The processor 91 is a CPU (Central Processing Unit), a processing device, an arithmetic unit, a microprocessor, or a DSP (Digital Signal Processor). The memory 92 is also shown in FIG.

When a part or all the functions of the control circuit 55 are realized by the processor 91, the part or all the functions are realized by the processor 91 and software, firmware, or a combination of software and firmware. The software or firmware is described as a program and stored in the memory 92. The processor 91 realizes a part or all the functions of the control circuit 55 by reading and executing the program stored in the memory 92.

If some or all of the functions of the control circuit 55 are realized by the processor 91, the air conditioner 1 implements a program in which some or all of the steps performed by the control circuit 55 will result in execution. It has a memory 92 for storing. It can be said that the program stored in the memory 92 causes the computer to execute a part or all of the procedure or method executed by the control circuit 55.

The memory 92 is, for example, non-volatile such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable Read Only Memory), and EEPROM (registered trademark) (Electrically Erasable Programmable Read-Only Memory). Alternatively, it may be a volatile semiconductor memory, a magnetic disk, a flexible disk, an optical disk, a compact disk, a mini disk, a DVD (Digital Versatile Disk), or the like.

FIG. 17 is a diagram showing a processing circuit 93 when a part or all of the functions of the control circuit 55 included in the air conditioner 1 according to the first embodiment are realized by the processing circuit 93. That is, some or all the functions of the control circuit 55 may be realized by the processing circuit 93.

The processing circuit 93 is dedicated hardware. The processing circuit 93 is, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof. Is.

With respect to the plurality of functions included in the control circuit 55, a part of the plurality of functions may be realized by software or firmware, and the rest of the plurality of functions may be realized by dedicated hardware. As described above, the plurality of functions of the control circuit 55 can be realized by hardware, software, firmware, or a combination thereof.

A part or all of the functions of the control circuit 55A included in the air conditioner 1A according to the second embodiment may be realized by a processor that executes a program stored in the memory. The memory is a memory for storing a program in which a part or all of the steps executed by the control circuit 55A will be executed as a result. Some or all of the functions of the control circuit 55A may be realized by the processing circuit. The processing circuit is the same processing circuit as the processing circuit 93.

The configuration shown in the above-described embodiment shows an example of the content of the present invention, can be combined with another known technique, and is one of the configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

1,1A air conditioner, 2 indoor unit, 3,3A outdoor unit, 21 indoor heat exchanger, 31, 31D outdoor heat exchanger, 31A 1st secondary heat exchanger, 31B 2nd secondary heat exchanger, 31C 3rd Secondary heat exchanger, 32 cooling / heating switching solenoid valve, 32A cooling / heating switching solenoid valve coil, 33A 1st defrost solenoid valve, 33B 2nd defrost solenoid valve, 33C 3rd defrost solenoid valve, 34 compressor, 50, 50A electric circuit, 51 Rectifier circuit, 52A 1st energization selection switch, 52B 2nd energization selection switch, 52C 3rd energization selection switch, 53 energization on / off switch, 54A 1st polarity changeover switch, 54B 2nd polarity changeover switch, 55, 55A control circuit, 60 AC power supply, 91 processor, 92 memory, 93 processing circuit, 330A 1st defrost solenoid valve coil, 330B 2nd defrost solenoid valve coil, 330C 3rd defrost solenoid valve coil.

Claims (2)

An outdoor heat exchanger having n auxiliary heat exchangers for heat exchange between the refrigerant and the outside air,
A cooling / heating switching solenoid valve for switching between cooling operation and heating operation,
The n defrost solenoid valves for causing the n auxiliary heat exchangers to operate the defrost, and the n defrost solenoid valves.
Equipped with an electric circuit to perform defrost operation and heating operation at the same time,
n is an integer greater than or equal to 2
The electric circuit
N energization selection switches that select to energize either the cooling / heating switching solenoid valve coil included in the cooling / heating switching solenoid valve or the defrost solenoid valve coil included in each of the n defrost solenoid valves. ,
An energization on / off switch that energizes any one of the cooling / heating switching solenoid valve coil and the n defrost solenoid valve coils.
Two polarity changeover switches that switch the direction of the current flowing through the cooling / heating solenoid valve coil and the n defrost solenoid valve coils, and
During the heating operation, one of the n auxiliary heat exchangers is controlled while the n energization selection switches, the energization on / off switch, and the two polarity changeover switches are controlled to continue the heating operation. As described above, the outdoor unit of an air conditioner having a control circuit for causing n-1 or less auxiliary heat exchangers to perform defrost operation. The outdoor unit of the air conditioner according to claim 1, wherein a part or all of the cooling / heating switching solenoid valve and the n defrost solenoid valves are latch type solenoid valves.

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