JP3322571B2 - Hot water air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for performing a cooling operation by a refrigerating cycle, and more particularly to a hot water air conditioner for performing heating by circulating hot water.

[0002]

2. Description of the Related Art An air conditioner for indoor air conditioning includes:
There is a hot water air conditioner that performs a cooling operation using a refrigeration cycle using a refrigerant and performs an efficient heating operation using hot water. The indoor unit of the hot water air conditioner is provided with a heat exchanger in which a refrigerant heat exchanger for circulating a refrigerant and a hot water heat exchanger for circulating hot water are integrally connected. When performing a cooling operation, the refrigerant heat exchanger is cooled by a refrigeration cycle using a refrigerant, and when performing a heating operation,
Water is heated by a water heater provided outside the room to generate hot water, and the hot water is supplied to a hot water heat exchanger of the indoor unit. In the indoor unit, air heated by hot water circulating in the hot water heat exchanger is blown into the room.

[0003] In the hot water heat exchanger, a large number of pipes bent in a U-shape are connected by fins in the same manner as the refrigerant heat exchanger, and one end of the pipe is connected to an adjacent pipe to perform a heating operation. Sometimes hot water flows through these pipes. On the other hand, during the cooling operation, the refrigerant heat exchanger is cooled by the refrigerant. This also cools the hot water heat exchanger. For this reason, the water in the pipe of the hot water heat exchanger is easily frozen.

[0004] Since water expands in volume due to freezing, if the water in the pipe of the hot water heat exchanger freezes, there is a risk that the pipe may be damaged and water leakage may occur. In particular, during cooling, the water in the hot water heat exchanger is not circulated, and thus is easily frozen.

In general, in an air conditioner, the temperature of a refrigerant heat exchanger is detected by a temperature sensor to control the cooling capacity. In the hot water heat exchanger, the cooling capacity (compressor) is controlled in accordance with the result of detection by the temperature sensor. The water in the hot water heat exchanger is prevented from freezing by controlling the capacity of the heat exchanger and stopping the compressor.

[0006]

However, if an error or the like occurs in the temperature detected by the temperature sensor that detects the temperature of the refrigerant heat exchanger, or if the control device that controls the cooling capacity malfunctions, the cooling capacity cannot be properly adjusted. May not be controlled. As a result, the temperature of the refrigerant heat exchanger may drop, and the water in the hot water heat exchanger may freeze. At this time, if there is no water leakage at the cracked part of the pipe, it is impossible to judge from the appearance, so the heating operation may be performed without noticing the damage of the hot water heat exchanger, This causes problems such as leakage of water from the air, and the inside of the room getting wet due to blowing of hot water.

[0007] In order to prevent such a problem, when freezing that may cause damage such as cracks in the pipe occurs, check the hot water heat exchanger, or more preferably, replace the hot water heat exchanger. Need to do.

The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to accurately detect whether or not freezing that causes damage to a pipe has occurred, and to reliably prevent water leakage from a hot water heat exchanger. It is an object to propose a hot water air conditioner that can perform air conditioning.

[0009]

The invention according to claim 1 is
A hot water heat exchanger in which hot water is circulated and a refrigerant heat exchanger in which refrigerant is circulated are integrally connected, and air that has passed through the hot water heat exchanger and the refrigerant heat exchanger is blown out toward the room to air-condition the room. Forming a refrigeration cycle using a refrigerant between the indoor unit, a hot water unit installed outdoors for generating hot water and circulating the generated hot water with the hot water heat exchanger, and a refrigerant heat exchanger. A refrigerant unit, and a hot water air conditioner comprising: a hot water heat exchanger built in the indoor unit, which is formed at a predetermined position of a pipe forming a closed flow path of hot water at the time of heating, inside the pipe. A pressure-opened part where cracks can be generated before other parts due to pressure increase, a protective cover that seals around the pressure-opened part and prevents water leakage from the pressure-opened part, and into this protective cover From the pressure opening And detecting means for detecting a leak,
During the cooling operation by the refrigerant heat exchanger, water leakage due to freezing of water in the hot water heat exchanger is prevented from leaking from the protective cover, and water leakage into the protective cover is detected to detect the hot water air conditioner. Is characterized by stopping the operation.

According to the present invention, when the pressure (water pressure) of the pipe in the hot water heat exchanger rises due to freezing of the internal water, first, damage such as a crack is caused in the pressure opening. The detecting means detects whether or not water in the pipe is leaking from the pressure opening. From this detection result, it can be accurately determined whether or not the water in the hot water heat exchanger is frozen.

[0011] Further, the protective cover seals the periphery of the pressure-opening portion, and even if water in the pipe leaks from a crack or the like generated in the pressure-opening portion, the water further leaks into the indoor unit or the room. It is prevented from being put out.

Therefore, the cooling operation can be continued without noticing that the water in the pipe of the hot water heat exchanger has frozen, and the pipe can be prevented from being ruptured by the frozen water. It is possible to prevent the inside of the indoor unit and the room in which the indoor unit is installed from being contaminated by the leak.

When the pressure inside the pipe becomes equal to or higher than a predetermined pressure, for example, by making the pipe partly thin or forming a groove for inducing cracks, the pressure-opening part is used as another part. The protective cover may be any structure as long as it has a structure in which a crack or the like is generated before the above-mentioned portion, and the protective cover is sealed so that water leakage from the crack or the like generated in the pressure opening portion does not leak from the protective cover.

[0014] The invention according to claim 2 is characterized by further comprising a cutoff means for cutting off the supply of electric power to the hot water unit or the refrigerant unit based on the detection result of the detection means.

According to the present invention, the shutoff means cuts off the supply of electric power to the refrigerant unit or the hot water unit based on the detection result of the detection means, and forcibly stops the operation. As a result, when the cooling operation is continued while the water in the hot water heat exchanger is starting to freeze, the occurrence of cracks and the like at other parts other than the pressure-opening part and the occurrence of water leakage are prevented. It can be reliably prevented.

The invention according to claim 3 is characterized in that the detecting means is a pressure detecting means for detecting a pressure change due to the flow of the water into the protective cover.

According to the present invention, the pressure in the protective cover, which rises due to the water in the pipe leaking into the protective cover from the pressure opening, is detected by the pressure detecting means. This makes it possible to easily and reliably detect freezing of water in the pipe of the hot water heat exchanger.

The pressure detecting means may be a pressure switch which operates in response to a change in pressure, and a pressure sensor measures a pressure change in the protective cover to determine whether or not freezing has occurred. It may be something.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a hot water air conditioner (hereinafter, referred to as a "hot water air conditioner 10") applied to the present embodiment includes an indoor unit 12 disposed indoors and an outdoor unit installed outdoor. 14.

The indoor unit 12 of the hot water air conditioner 10 has an indoor unit 22 having a heat exchanger 20 in which an evaporator 16 constituting a refrigeration cycle and a radiator 18 to which hot water is supplied are integrated. . The outdoor unit 14 has a refrigerant unit 24 that forms a refrigeration cycle with the evaporator 16 of the indoor unit 22 and a hot water unit 26 that circulates hot water with the radiator 18. This hot water air conditioner 1
At 0, the cooling operation is performed mainly by the refrigerating cycle, and the heating operation is performed by circulating hot water.

The outdoor unit 14 may be an integral type in which the refrigerant unit 24 and the hot water unit 26 are provided in the same box.
May be provided separately. The hot water air conditioner to which the present invention is applied includes a refrigerant unit 24.
And the hot water unit 26 are each provided with a plurality of indoor units 22.
The hot water unit 26 may be configured to circulate hot water between the indoor unit 22 and a floor mat for performing floor heating.

The indoor unit 22 and the refrigerant unit 24 are connected by refrigerant pipes 28A and 28B.
In the evaporator 16 of the indoor unit 22, a refrigerant pipe 28A,
28B are connected at one end. The other end of one of the refrigerant pipes 28A and 28B (the refrigerant pipe 28A) is connected to a valve 32 provided in the refrigerant unit 24.

This valve 32 is connected to a four-way valve 36 via a muffler 34A. The four-way valve 36 includes an accumulator 38, a compressor 40, and a muffler 34B.
Are connected to both sides of the connected pipeline, and further connected to one of the heat exchangers 42. The other end of the heat exchanger 42 is connected to the other end of the other refrigerant pipe 28B via a capillary tube 44, a strainer 46, and a valve 48.

Thus, in the hot water air conditioner 10, a closed refrigerant circulation path, that is, a refrigeration cycle is formed between the indoor unit 22 and the refrigerant unit 24, and the operation mode is changed to the cooling mode and the heating mode by switching the four-way valve 36. Mode and defrosting mode (dry mode). In the refrigerant unit 24, a cooling fan 52 for cooling the heat exchanger 42 is provided near the heat exchanger 42. FIG. 1 shows the flow of the refrigerant in each operation mode. Further, the heat exchanger 20 of the indoor unit 22 is provided with a heat exchanger temperature sensor described later, so that the temperature of the evaporator 16 does not become lower than a predetermined temperature (for example, 6.4 ° C. or lower) during the cooling operation. The cooling operation is performed while controlling the capacity of the compressor 40.

On the other hand, the radiator 18 of the indoor unit 22
For example, a hot water inlet nipple 56 provided in the hot water unit 26 of the outdoor unit 14 via flexible hot water pipes (hereinafter, referred to as “hot water tubes”) 30A and 30B.
A, connected to hot water outlet nipple 56B. The hot water inlet nipple 56A is connected to a hot water outlet nipple 56B via a pressure tank 60 having a pressure cap 58, a pump 62, and a hot water heat exchanger 64.

The hot water tube 30B connected to the hot water outlet nipple 56B is connected to a hot water inlet nipple 66A provided in the indoor unit 22, and connected to the radiator 18 via a variable flow valve 68. The radiator 18 includes a hot water outlet nipple 66B of the indoor unit 22.
Is connected to the hot water outlet nipple 66B to connect the hot water tube 54B to the indoor unit 22.
A closed circulation path of hot water is formed between the hot water unit 26 and the hot water unit 26.

The hot water unit 28 is provided with a gas burner 70 to which gas for combustion is supplied from outside the machine.
The hot water heat exchanger 64 is heated by the gas burner 70 to generate hot water from water passing through the hot water heat exchanger 64. The pressure tank 60 is connected to the drain tank 72 via the pressure cap 58, and the space between the hot water heat exchanger 64 and the pump 62 is connected to the pressurized inlet nipple 76 via the check valve 74. I have.

Water circulating in the hot water circuit (for example, tap water)
Is injected from a pipe connected through the pressure injection port nipple 76 and discharged through the drain tank 72. Further, one end of a branch pipe 80 provided with a heat valve 78 is connected between the hot water heat exchanger 64 and the pump 62, and a hot water outlet nipple 82 A provided at the other end of the branch pipe 80 is connected to A hot water tube for circulating hot water to a floor mat (not shown) can be connected to a hot water inlet nipple 82B provided adjacent to the hot water inlet nipple 56A. A high temperature thermistor 84 for measuring the temperature of the hot water supplied to the indoor unit 22 is provided between the hot water heat exchanger 64 and the hot water outlet nipple 56B. A low temperature thermistor 86 for measuring the temperature is provided.

The operation of the hot water unit 26 is stopped when the hot water air conditioner 10 is in the cooling mode or the dry mode. However, the pump 62 and the burner 70 are operated during the heating operation of the hot water air conditioner 10 (heating mode), and the high temperature thermistor is operated. 84 is a predetermined temperature of about 80 (for example, 82
° C), and circulates while heating the hot water passing through the hot water heat exchanger 64.

In this hot water circuit, the water temperature (temperature of hot water)
Rises and the internal pressure exceeds a predetermined value (for example, 0.9 kg / cm2), the pressure valve of the pressure cap 58 operates,
Hot water flows out of the pressure relief port provided in the pressure cap 58 to the drain tank 72 to prevent the pressure in the pipe from rising. Further, in the hot water circulation path, when the temperature of the hot water decreases and the internal pressure becomes less than a predetermined value, the negative pressure valve operates to collect the water from the drain tank 72. The water overflowing from the drain tank 72 is discharged from the drain pipe connection port.

On the other hand, the indoor unit 22 is provided with a blower fan 90. The blower fan 90 sucks indoor air into the indoor unit 22 and passes the air through the heat exchanger 20. At this time, the temperature of the air passing through the heat exchanger 20 is adjusted by the evaporator 16 or the radiator 18. In the hot water air conditioner 10, the air conditioned by the heat exchanger 20 is blown out into the room to achieve indoor air conditioning (FIG. 1).
The flow of air is shown by arrow A in FIG.

As shown in FIGS. 2 and 3, the evaporator 1
6 and the radiator 18 (the evaporator 16 is shown as an example in FIG. 2 and the radiator 18 is not shown), a large number of fins 92 are closely arranged, and the fins 9 adjacent to each other are arranged.
The air passes through the gap 2. Further, pipes 94 and 96 through which the refrigerant or the hot water passes penetrate the respective fins 92, and the respective fins 92 and the pipes 94 and 96 are connected.

In FIG. 2, the heat exchanger 20 is connected to the evaporator 16.
It is a front view seen from the side, and the evaporator 16 has a large number of fins 92 arranged tightly on a rectangular frame 16A. The pipe 94 has a shape bent at an intermediate portion, and is attached so that the straight portion 94A passes through the frame 16A and the fin 92 from one end of the frame 16A. A U-shaped pipe 93 is connected to the open end of the pipe 96 projecting from the frame 16A by welding or the like via a sleeve 93A, thereby forming a flow path through which the refrigerant is circulated in the evaporator 16. I have. The basic configuration of the radiator 18 is the same as that of the evaporator 16, and is not shown in FIG.

FIG. 3 shows a side view of the heat exchanger 20. In the radiator 18, a large number of fins 92 are provided on the frame 18A, and a pipe 96 extends through these.
Is installed.

As shown in FIGS. 2 and 3, the evaporator 16 is provided with draw-out pipes 150 and 152 to which the refrigerant pipes 28A and 28B are connected, and these are directly or indirectly (via the pipe 93). ) Is connected to one of the pipes 94. The radiator 18 is provided with draw-out pipes 154 and 156 connected to the variable flow rate valve 68 and the hot water outlet nipple 66B, and these are connected to the ends of the flow rate of the hot water formed by the pipe 96, respectively.

In the hot water air conditioner 10, during cooling operation, the refrigerant passes through the pipe 94 of the evaporator 16, so that the fins 92 of the evaporator 16 are cooled by the refrigerant, and the air passes between the fins 92. Is cooled.
Further, in the hot water air conditioner 10, the hot water flows through the pipe 96 of the radiator 18 during the heating operation, so that the fins 92 of the radiator 18 are heated by the hot water, and the air blown into the room passes through the radiator 18. The radiator 18 is heated by the fins 92.

As shown in FIGS. 2 and 4, the radiator 1
The pipe 96 provided in the pipe 8 is bent at an intermediate portion to form a substantially U-shape, and the straight portions 96A of the respective pipes 96 penetrate the tightly arranged fins 92 and are connected to the fins 92. (See FIG. 2, FIG. 4 does not show the fins 92). Thus, in the radiator 18, the U-shaped pipe 96 is disposed on the radiator 18 with the respective straight portions 96A being substantially parallel. Also. The bent portions 96B of the respective pipes 96 are arranged so as to protrude from one end of the radiator 18.

On the other hand, at the other end of each radiator 18, an end of a pipe 96 is provided so as to project therefrom, and adjacent pipes 96 are connected by a U-shaped connecting pipe 98. The connection between the pipe 96 and the connecting pipe 98 is performed by welding or the like via a sleeve 100 as in the case of the pipe 94.

By the way, as shown in FIG.
The connection pipe 98 is provided with a crack inducing section 104 having a cross-shaped narrow groove 102 formed on the surface thereof as an opening section of the present invention. The crack inducing portion 104 may be formed in a plurality of connecting pipes 98, or the connecting pipe 98 having the lowest temperature or the pipe having the lowest temperature in consideration of the position with respect to the drawing pipes 150 and 152. It may be formed in a connecting pipe 98 connected to 96. As shown in FIG. 3, in the present embodiment, as an example, the crack inducing portion 104 is formed in the central connecting pipe 98 closest to the drawer pipes 150 and 152.

The narrow groove 102 for forming the crack inducing portion 104 in the connecting pipe 98 is formed, for example, by forming a groove at a predetermined depth on the surface of the connecting pipe 98, whereby the internal pressure is reduced. Is higher than the specified value,
A crack is formed along the narrow groove 102.

As shown in FIGS. 3, 4 and 5A, the connecting pipe 98 is provided with a cap 106 as a protective cover for tightly covering and sealing around the narrow groove 102. As shown in FIGS. 5A and 5B, the cap 106 is in a cylindrical state with one end closed, and the opening side is directed to the crack inducing portion 104 so as to surround the narrow groove 102. It is joined to the surface of the connecting pipe 98 by welding or the like. Even if the cap 106 is cracked along the narrow groove 102 of the crack inducing portion 104 and the water in the connecting pipe 98 leaks to the surface side of the connecting pipe 98, the water may leak from the inside of the cap 106. I try not to. Thus, even if water leaks from the crack inducing section 104, the water does not leak into the indoor unit 22 into the room. This cap 10
The inside of 6 is set at a pressure equal to or slightly lower than the pressure of normal hot water in the connecting pipe 98.

On the other hand, as shown in FIG. 5A, a pressure switch 1
28 are provided. The pressure switch 128 switches contacts when the pressure inside the cap 106 exceeds a set pressure. That is, when water leaks from the crack inducing portion 104 into the inside of the cap 106 due to freezing and the pressure inside the cap 106 increases, the contacts are switched.

In the hot water unit 26 of the hot water air conditioner 10 applied to the present embodiment, the pressure cap 58
Thus, the pressure of the hot water is adjusted so as not to exceed 0.9 kg / cm 2, and especially in the cooling operation, since there is no circulation of water, the pressure does not increase except for freezing. From this, in the connecting pipe 98, when the narrow groove 102 becomes, for example, 1.0 kg / cm 2 or more, the pressure becomes 0.9 kg / c.
When the predetermined value of m2 or more is exceeded, the pipe 96 and the connecting pipe 98 are damaged before other parts. The pressure sensor 128 is configured such that the inside of the cap 106 is
04 is set so as to detect a pressure slightly lower than the pressure at which cracks occur, and operates when the set value is exceeded.

As shown in FIG.
The indoor unit 22 includes a control board 1 having a microcomputer.
A power supply 10 is provided to the control board 110 via an outlet (not shown) or the like. The control board 110 includes a power supply relay board 11.
2 is connected to the outdoor unit 14 (the refrigerant unit 24 and the hot water unit 2) through the power supply relay board 112.
6).

Each of the refrigerant unit 24 and the hot water unit 26 of the outdoor unit 14 is provided with a control board (not shown) having a microcomputer.
16 and the serial communication line 118 to control board 110
And the power supply relay board 112 and the control board 110
, The refrigerant unit 24 or the hot water unit 26 is operated based on the control signal from the controller.

The control board 110 includes a power switch (not shown) and a receiving board for receiving a signal from a remote control switch for operating the hot water air conditioner 10.
Further, a fan motor 120 that rotationally drives the blower fan 90 of the indoor unit 22 and a flap motor 122 that operates a flap (not shown) that adjusts the direction of wind blown into the room by the blower fan 90 are provided.

The control board 110 supplies power to the refrigerant unit 24 to the hot water unit 26 by operating the remote control switch while the power switch is turned on, and sets the operation mode, the set temperature, and the indoor temperature. The indoor unit 22 and the refrigerant unit 24 or the hot water unit 26 are controlled based on the temperature and the outside air temperature. On the other hand, a heat exchanger temperature sensor 126 (hereinafter, referred to as a “heat exchange temperature sensor”) that measures the temperature of the heat exchanger 20 is provided on the control board 110, together with an indoor temperature sensor 124 that measures the indoor temperature. . The control board 110 controls the cooling and heating capacity of the hot water unit 26 and the refrigerant unit 24 in accordance with the temperature detected by the heat exchange temperature sensor 126 during the heating and cooling operations, and prevents the heat exchanger 20 from being excessively cooled during the cooling operation. Controls cooling capacity.

As shown in FIG. 7, the power supply relay board 112 is provided with a power relay 136 for opening / closing the setting in response to a signal from the control board 110 and supplying / stopping power to the outdoor unit 14. , A power relay 138 is provided as a breaking means. The power relay 138 is connected to the pressure switch 128,
Electric power can be supplied to the outdoor unit 14 in accordance with opening and closing of the contact 8.

That is, the power relays 136 and 138
Has opened the internal contact 140 (normally open), and the power relay 136 is energized to the coil 142 when the hot water
Close 0. This allows the indoor unit 12 to move from the outdoor unit 14
Power supply to the vehicle.

The coil 142 of the power relay 138 includes
The power is supplied via a pressure switch 128. When the pressure inside the cap 106 is a normal pressure (a pressure lower than the set pressure), the pressure switch 128 closes the internal contact and turns the coil of the power relay 138 on. To be energized. Thereby, the power relay 138
In a state where no crack is generated in the crack inducing section 104 of the connection pipe 98, power can be supplied to the outdoor unit 14.

On the other hand, the pressure switch 128
When the pressure inside 06 increases, the internal contact is opened. Thereby, the coil 1 of the power relay 138
The energization to 42 is stopped. On the power relay board 112, the power relay 138
In a state where 0 is opened, supply of electric power to the outdoor unit 14 is stopped.

Next, the operation of the present embodiment will be described.

In the hot water air conditioner 10, when the heating operation is set, the gas burner 70 of the hot water unit 26 is ignited to heat the water in the hot water heat exchanger 64 to supply hot water based on the outside air temperature and the set temperature. Generate. At the same time, the hot water unit 26 operates the pump 62 to start circulation of the hot water.

In the indoor unit 22 of the hot water air conditioner 10, the operation of the pump 62 causes the heat exchanger 20 to operate.
Hot water is circulated to the radiator 18 at a predetermined pressure, and the fins 92 of the radiator 18 are heated by the hot water. At the same time, the indoor unit 22 operates the blower fan 90 to suck indoor air, and the fins 9 of the radiator 18.
Pass between two. The air passing between the fins 92 of the radiator 18 is warmed by the air heated by the hot water. The room heated by the air heated by the radiator 18 is blown out into the room.

At this time, the hot water in the radiator 18 does not exceed a predetermined pressure, so that the crack inducing portion 104 is not cracked or damaged. Further, since the pressure does not increase when the circulation of the hot water is stopped, the crack inducing section 104 is not cracked or damaged even in this case.

On the other hand, when performing the cooling operation with the hot water air conditioner 10, the refrigerant unit 24 provided in the outdoor unit 14 is operated to control the capacity of the compressor 40 based on the outside air temperature, the indoor temperature, the set temperature and the like. Refrigerant unit 2
The refrigerant is circulated between the indoor unit 4 and the indoor unit 22.

In the indoor unit 22, a large number of fins 9 of the evaporator 16 are cooled by the refrigerant supplied from the refrigerant unit 24.
2 is cooled. The air blown into the room is cooled when passing between the fins 92 of the evaporator 16. Evaporator 1
The air cooled by 6 is blown out toward the room, thereby cooling the room.

At this time, in the hot water air conditioner 10, the temperature of the heat exchanger 20 is detected by the heat exchange temperature sensor 126, and the cooling capacity (for example, the capacity of the compressor 40) of the refrigeration cycle is controlled based on the detected temperature. The temperature of the heat exchanger 20 is prevented from falling below a predetermined temperature.
This prevents the water in the radiator 18 from freezing.

By the way, for example, an error occurs in the temperature detected by the heat exchange temperature sensor 126 or a malfunction occurs in the control of the cooling capacity of the control board 110, so that the evaporator 16 is cooled to a predetermined temperature or less set during the cooling operation. Then, the radiator 18 is also cooled by the evaporator 16. As a result, when the temperature of the radiator 18 drops significantly, water in the radiator 18 may freeze.

In the hot water air conditioner 10, when the water in the radiator 18 freezes due to a decrease in the temperature of the evaporator 16, the pressure inside the pipe 96 as well as the inside of the connecting pipe 98 increases. In the radiator 18, when the pressure in the pipe 96 or the connecting pipe 98 increases, first, the connecting pipe 98
Are cracked or damaged in the narrow groove 102 of the crack inducing section 104 provided in the above.

When a crack or damage occurs in the crack inducing portion 104, water in the connecting pipe 98 enters the inside of the cap 106 and increases the pressure inside the cap 106. As a result, the pressure switch 128 provided in the cap 106 is operated to open the internal contact.

On the other hand, in the power supply relay board 112 provided in the indoor unit 22, when the pressure switch 128 provided in the connection pipe 98 opens the internal contact, the power supply to the coil 142 of the power relay 138 is stopped. Thereby, the power supply relay board 112 shuts off the supply of electric power to the outdoor unit 14 and stops the operation of the refrigerant unit 24, so that the cooling of the evaporator 16 is stopped. In the radiator 18,
When the cooling by the evaporator 16 is stopped, no crack or damage occurs in a portion other than the crack inducing portion 104.

As described above, when the water inside the radiator 18 freezes due to the supercooling of the evaporator 18, the outdoor unit 14
By interrupting the power supply to the radiator 18, the water in the pipe 96 and the connecting pipe 98 provided in the radiator 18 freezes, and not only the crack inducing portion 104, but also the cracks and breakage in other portions are prevented. Occurrence can be reliably prevented. Further, since the operation of the hot water air conditioner 10 is stopped in a state where the pipe 96 and the connecting pipe 98 of the radiator 18 may have cracks due to freezing, water leakage from the radiator 18 can be prevented. At the same time, the operation of the hot water air conditioner 10 in a state where water leakage easily occurs can be stopped, and the inside of the indoor unit 12 and the room where the indoor unit 12 is installed can be prevented from being contaminated by the water leakage. be able to.

In the embodiment of the present invention described above, when the water inside the radiator 18 freezes, the outdoor unit 14
Although the power to the has been cut off, it is sufficient that at least the configuration to cut off the supply of power to the refrigerant unit, thereby,
The progress of freezing can be stopped to prevent water leakage.

This embodiment does not limit the present invention. INDUSTRIAL APPLICABILITY The present invention is applied to a hot water air conditioner of various configurations in which a refrigerant heat exchanger for performing a cooling operation by a refrigeration cycle and a hot water heat exchanger for performing a heating operation by circulating hot water are integrally provided in an indoor unit. can do. Further, in the present embodiment, the crack inducing portion is formed in the connecting pipe connecting the mutually adjacent pipes, but the portion where the crack inducing portion is formed may be cracked or cracked earlier than other portions due to pressure increase. Any structure may be used as long as the structure causes damage.

Further, in this embodiment, the pressure switch is provided as the detecting means. However, the pressure switch may be measured by using a pressure sensor, and electrical means such as electrodes, limit switches, etc. Various detecting means such as detecting means for detecting whether a crack or a damage has occurred in the crack inducing portion by the mechanical means described above can be used.

In this embodiment, the supply of electric power to the outdoor unit is cut off based on the detection result of the detecting means. However, the present invention is not limited to this. The result, that is, the fact that the water in the radiator is frozen may be notified.

[0069]

As described above, according to the present invention, when the water in the pipe of the hot water radiator is frozen, a crack is formed at the pressure-opened portion where the protection cover is provided to prevent water leakage. Since the detection is performed by the detection means, it is possible to accurately determine whether or not the freezing has occurred. Also, by stopping the operation of the refrigerant unit when freezing occurs,
It is possible to prevent the progress of freezing and the occurrence of cracks in other parts of the pipe. Thereby, an excellent effect that water leakage from the hot water radiator due to freezing can be reliably prevented is obtained.

[Brief description of the drawings]

FIG. 1 is a pipeline diagram showing a schematic configuration of a pipeline of hot water and a refrigerant of a hot water air conditioner.

FIG. 2 is a schematic front view showing a heat exchanger.

FIG. 3 is a schematic side view showing a heat exchanger.

FIG. 4 is a schematic view showing connection of pipes of a radiator.

FIG. 5A is a sectional view of a main part showing a connecting pipe provided with a crack inducing portion, and FIG. 5B is a diagram showing the crack inducing portion.
FIG. 5 is a cross-sectional view of a main part along line 5B-5B of FIG.

FIG. 6 is a schematic wiring system diagram showing a part of a control unit of the indoor unit.

[Explanation of symbols]

 Reference Signs List 10 hot water air conditioner (hot water air conditioner) 12 indoor unit 14 outdoor unit 16 evaporator 18 radiator 20 heat exchanger 22 indoor unit 24 refrigerant unit 26 hot water unit 92 fin 96 pipe 98 connecting pipe 102 narrow groove 104 crack inducing part (pressure) Opening part) 110 Control board 112 Power supply relay board (cutoff means) 128 Pressure switch (detection means, pressure detection means) 138 Power relay (cutoff means)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI F28F 27/00 511 F24F 1/00 391B (58) Fields investigated (Int.Cl. ⁷ , DB name) F24F 1/00 391 F24F 1/00 331 F24F 11/02 102 F24F 11/00 F24F 27/00 511 F25B 49/02 540 F24F 11/02

Claims (3)

(57) [Claims] 1. A hot water heat exchanger in which hot water is circulated and a refrigerant heat exchanger in which a refrigerant is circulated are integrally connected, and air that has passed through the hot water heat exchanger and the refrigerant heat exchanger is blown out toward a room. An indoor unit that achieves indoor air conditioning, a hot water unit that is installed outdoors to generate hot water and circulate the generated hot water between the hot water heat exchanger, and a refrigerant between the refrigerant heat exchanger And a refrigerant unit that forms a refrigeration cycle according to claim 1, wherein a predetermined number of pipes forming a closed flow path of hot water during heating in the hot water heat exchanger built in the indoor unit. A pressure-opening part formed at the position of the pipe and capable of generating a crack prior to other parts due to a rise in pressure in the pipe; and a protection for sealing the periphery of the pressure-opening part to prevent water leakage from the pressure-opening part. A cover, And detecting means for detecting water leakage from the pressure-opening section into the cover, the refrigerant heat exchange
Of water in the hot water heat exchanger during cooling operation by the heat exchanger
To prevent water leakage from the protective cover
Then, when a water leak into the protective cover is detected,
A hot water air conditioner characterized by stopping the operation of the air conditioner. 2. The hot-water air conditioner according to claim 1, further comprising a shut-off unit that shuts off power supply to the hot water unit or the refrigerant unit based on a detection result of the detection unit. . 3. The hot-water air according to claim 1, wherein said detecting means is a pressure detecting means for detecting a pressure change due to the inflow of said water into said protective cover. Harmony machine.