JP2912811B2 - 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 equipped with a refrigerant heater and capable of securing a heating capacity even at a low temperature.

[0002]

2. Description of the Related Art In recent years, an air conditioner that performs indoor cooling and heating has a cooling operation in which a cooling operation is performed using air as a heat source in summer and a heating operation is performed by heating the refrigerant with a refrigerant heater in winter. There is a type air conditioner. Conventionally, this type of air conditioner generally has a configuration as shown in FIG. Hereinafter, the configuration will be described with reference to FIG.

[0003] As shown in FIG.
2. An outdoor heat exchanger 103, a first check valve 104, an expansion valve 105, an indoor heat exchanger 106, and a second check valve 107 and a suction pipe 108 are sequentially piped through the other end of the four-way valve 102. And a heat pump refrigeration cycle returning to the compressor 101. Then, the first check valve 104 and the expansion valve 10
5 through the solenoid valve 109 from the communication portion of the refrigerant heating circuit 11
0 is branched and connected to the suction pipe 108. In the refrigerant heating circuit 110, a refrigerant heater 111 is provided. The refrigerant heater 111 is provided with a gas burner 112 attached thereto.
Via a fuel supply source (not shown).

The operation of the above configuration will be described. During the cooling operation, the refrigerant discharged from the compressor 101 passes through the four-way valve 102 as shown by the solid arrow, and the outdoor heat exchanger 10
Flow into 3 The refrigerant flowing into the outdoor heat exchanger 103 is condensed and liquefied by exchanging heat with outdoor air, passes through the first check valve 104, is controlled to an appropriate flow rate by the expansion valve 105, and is depressurized. It flows into the heat exchanger 106. The refrigerant that has flowed into the indoor heat exchanger 106 evaporates and evaporates by exchanging heat with the indoor air to cool the room. Then, the other end of the four-way valve 102, the second check valve 10
7. It returns to the compressor 101 through the suction pipe 108.

[0005] During the heating operation, the refrigerant discharged from the compressor 101 is supplied to the indoor heat exchanger 1 as shown by the dashed arrow.
Condensed and liquefied by exchanging heat with indoor air at 06,
Heat the room. Thereafter, the flow rate is controlled to an appropriate flow rate by the expansion valve 105, and the refrigerant heater 111 is passed through the solenoid valve 109.
Flows into. In the refrigerant heater 111, the fuel control valve 113
The gas supply amount of the fuel supply source is controlled by the
Combustion at 12 heats the refrigerant.
The refrigerant heated by the refrigerant heater enters a gaseous state, passes through the suction pipe 108, and returns to the compressor 101.

In order to prevent a shortage of the refrigerant due to accumulation of the refrigerant in the outdoor heat exchanger 103 during the heating operation, the refrigerant recovery operation generally performed prior to the heating operation is performed by setting the four-way valve 102 to the heating side. The operation is performed by operating the compressor 101 with the solenoid valve 109 closed. The refrigerant discharged from the compressor 101 is guided to the indoor heat exchanger 106 via the four-way valve 102. At this time, the electromagnetic valve 109
Is in the closed state, the discharged refrigerant stays in the indoor heat exchanger 106. On the other hand, by the operation of the compressor 101, the refrigerant in the outdoor heat exchanger 103 and the refrigerant heater 111 is supplied to the suction pipe 10
8 and is collected on the heating cycle side. Thereafter, the heating operation is performed by opening the solenoid valve 109.

[0007] Regarding the method of controlling the capacity, during the heating operation, the inlet and outlet temperatures of the refrigerant of the refrigerant heater 111 are detected, and the opening degree of the expansion valve 105 is controlled based on the temperature difference. A method of detecting the inlet temperature and the outlet temperature of the heat exchanger 103 and controlling the opening degree of the expansion valve 105 based on the temperature difference (Japanese Patent Laid-Open No. 1-142369), the inlet and outlet temperatures of the refrigerant of the refrigerant heater 111 To detect
A method of controlling the fuel control valve 113 based on the temperature difference (Japanese Patent Application Laid-Open No. H1-305268), detecting the refrigerant outlet temperature of the refrigerant heater 111 and comparing the detected temperature with a predetermined set value allows the fuel control valve 113 to operate. There is a control method (JP-A-3-36450).

[0008] As a method for improving the heating start-up performance, the discharge temperature of the compressor 101 is detected at the start of the heating operation, and when the discharge temperature is lower than the set value, the operating frequency of the compressor 101 is maximized and is higher than the set value. In Japanese Patent Application Laid-Open No. 1-139968, a method of operating at a frequency corresponding to the indoor air-conditioning load, detecting the inlet temperature of the refrigerant of the refrigerant heater 111 at the start of the heating operation, and detecting the detected temperature below a set value. ,
A method of controlling the heating amount of the refrigerant heater 111 to be equal to or less than a set value to prevent abnormal heating of the refrigerant (Japanese Patent Laid-Open No. 2-64371). When the heating operation is started, the capacity of the compressor 101 immediately corresponds to the load. And a method of gradually increasing the heating amount of the refrigerant heater 111 toward a value corresponding to the load, and thereafter controlling the capacity of the compressor 101 and the heating amount of the refrigerant heater 111 according to the load, respectively. (JP-A-3-36
449) and the like.

[0009] The method of the refrigerant recovery operation includes a method of performing the refrigerant recovery operation for a predetermined time (Japanese Patent Laid-Open No. 63-135552).
A method of detecting the suction pressure of the compressor 101 and, when the detected pressure becomes equal to or lower than the set pressure, ending the refrigerant recovery operation (Japanese Patent Laid-Open No. 1-314866), detecting the temperature of the suction pipe 108 and detecting the detected temperature. There is a method of setting the refrigerant recovery time according to the method (Japanese Patent Laid-Open No. 2-64372).

[0010]

In such a conventional structure, the combustion section is provided in the refrigerant heater, so that the product cannot be miniaturized, and the combustion burner section and the fuel control valve require careful protection control. This is necessary, complicating the product structure, and causing a problem that the specific volume of the refrigerant sucked into the compressor fluctuates due to an increase or decrease in the amount of heating of the refrigerant, and the amount of the circulated refrigerant is unstable.

In addition, there is a problem that the time required for the refrigerant recovery operation performed at the start of the heating operation is long and the start-up time is slow.

Further, since either the heating amount or the opening degree of the expansion valve is controlled based on the difference between the refrigerant temperatures at the inlet and the outlet of the refrigerant heater, it takes time for the refrigerant to be controlled to an appropriate state, and excessive cooling is required. There was a problem that heating and liquid back occurred.

Further, since either the heating amount or the opening degree of the expansion valve is controlled by the temperature difference between the inlet and the outlet of the refrigerant heater, there is a problem that the control range is narrow and it is difficult to secure a variable capacity range.

Further, there is a problem that a temperature sensor for controlling the expansion valve is required for each of heating and cooling, which increases the cost and complicates the control.

Further, when the indoor air-conditioning load fluctuates and the number of revolutions of the compressor changes, there is a problem that the follow-up of the expansion valve opening or the refrigerant heating amount is delayed, and the operation corresponding to the load cannot be performed. .

Further, when the indoor air-conditioning load is small, there is a problem that the heating capacity cannot be reduced and the operation with low energy efficiency is performed.

Further, at the start of the heating operation, there is a problem that the required amount of the circulating refrigerant cannot be secured and the rapid heating performance is inferior.

Further, in the case where hunting occurs between the refrigerant amount and the heating amount for some reason during operation, there is no means for returning.
There has been a problem that the liquid bag and the abnormal heating are repeated, thereby impairing the durability of the compressor.

Further, during the cooling operation, when the evaporating pressure of the refrigerant becomes low and the refrigerant becomes 0 ° C. or less, the water in the hot water pipe of the hot water-to-refrigerant heat exchanger freezes and the pipe is damaged. there were.

Further, if the amount of refrigerant heating becomes excessive with respect to the amount of circulation of the refrigerant during the heating operation, there is a problem that excessive heating or hunting occurs.

The present invention has been made to solve the above-mentioned problems, and can reduce the size and simplification of a product, perform stable operation, and perform heating.
Reduced refrigerant recovery operation time at the start and improved quick warming effect
A first object of the present invention is to provide a conditioned air conditioner.

[0022]

A second object is to provide an air conditioner capable of immediately controlling a refrigerant to an appropriate state.

A third object is to provide an air conditioner capable of expanding a variable capacity range and realizing a comfortable air-conditioned space.

A fourth object of the present invention is to provide an air conditioner in which a temperature sensor for controlling an expansion valve is used for both cooling and heating, thereby reducing costs and simplifying control.

A fifth object of the present invention is to provide an air conditioner capable of immediately following a change in indoor air conditioning load.

A sixth object of the present invention is to provide an air conditioner capable of reducing the capacity and following the load even when the indoor air conditioning load is small.

A seventh object is to provide an air conditioner in which the required amount of refrigerant circulating at the start of the heating operation is ensured and the start-up performance is improved.

An eighth object of the present invention is to provide an air conditioner capable of recovering even if hunting of the refrigerant amount and the heating amount occurs and improving the life of the compressor.

A ninth object is to provide an air conditioner that prevents breakage of piping due to freezing of water during cooling operation.

A tenth object is to provide an air conditioner capable of preventing overheating and hunting during a heating operation.

[0032]

A first means for achieving the first object of the present invention is a compressor, a four-way valve connected to a discharge side of the compressor, and one end of the four-way valve. An outdoor heat exchanger connected to the outdoor heat exchanger, a first check valve connected to the outdoor heat exchanger, an expansion valve connected to the first check valve, the expansion valve and the four-way valve, An indoor heat exchanger connected between the two-way valve, a second check valve connected to the other end of the four-way valve, and a suction pipe connecting the second check valve to a suction side of the compressor. An air conditioner provided with a refrigerant heating circuit branched from between the first check valve and the expansion valve and connected to the suction pipe via an electromagnetic valve; A heat exchanger is provided, a flow valve is provided in a hot water pipe of the hot water-refrigerant heat exchanger, and a refrigerant distribution through which the refrigerant flows through the hot water-refrigerant heat exchanger. If, consist of a hot water pipe flows the warm water was placed such that the flow of the refrigerant and the hot water is parallel,
Open / close valve in the refrigerant heating circuit on the outlet side of the hot water-to-refrigerant heat exchanger
Is provided.

[0033]

Further, a second means for achieving the second object comprises a first temperature sensor for detecting a refrigerant temperature on an inlet side of the hot water / refrigerant heat exchanger, and a first temperature sensor for detecting the temperature of the hot water / refrigerant heat exchanger. A second temperature sensor for detecting a refrigerant temperature at an outlet side, a first calculating means for calculating a difference between detection signals of the first and second temperature sensors, and determining whether a result of the calculation is within a set range. And a first control means for controlling the opening of the expansion valve and the opening of the flow valve when the result of the determination is out of the set range.

A third means for achieving the third object comprises a first temperature sensor for detecting a refrigerant temperature on the inlet side of the hot water / refrigerant heat exchanger, and a first temperature sensor for detecting the temperature of the hot water / refrigerant heat exchanger. A second temperature sensor for detecting a refrigerant temperature at an outlet side, a first calculating means for calculating a difference between detection signals of the first and second temperature sensors, and determining whether a result of the calculation is within a set range. First determining means for performing the determination, a second controlling means for controlling the opening of the expansion valve when the determination result is within a set range, and a third determining means for detecting the temperature of the hot water at the inlet side of the hot water-refrigerant heat exchanger. Temperature sensor, a fourth temperature sensor for detecting the temperature of hot water at the outlet of the hot water-to-refrigerant heat exchanger, and a second calculating means for calculating a difference between detection signals of the third and fourth temperature sensors. And a second determining means for determining whether the calculation result is within a set range. When it is obtained by a configuration in which the determination result is provided a third control means for controlling the opening degree of the flow valve when outside the range.

A fourth means for attaining the fourth object comprises a first temperature sensor for detecting a refrigerant temperature on the inlet side of the hot water / refrigerant heat exchanger, an outdoor heat exchanger, and a first heat sensor. A bypass pipe branched from between the check valves and connected between the four-way valve and the second check valve via a capillary tube, a fifth temperature sensor provided on a low pressure side of the capillary tube, A sixth temperature sensor provided in the pipe, for detecting a temperature of the refrigerant sucked into the compressor, a third determining means for determining whether the operating state is cooling or heating, and a third determining means for determining whether the operating state is heating. A third calculating means for calculating a difference between the detection signals of the first and sixth temperature sensors, and a difference between the detection signals of the fifth and sixth temperature sensors when the result of the determination by the third determining means is cooling. A fourth calculating means for calculating the third and fourth Fourth determining means for determining whether the calculation result of the calculating means is within the set range, and fourth control means for controlling the opening of the expansion valve when the determined result is out of the set range. It is.

A fifth means for achieving the fifth object is an indoor load calculating means for calculating a required indoor capacity, and a rotational speed determining means for determining a rotational speed of the compressor from the calculation result. An inverter circuit for operating the compressor at the determined rotation speed, and fifth control means for controlling the opening of the expansion valve and the opening of the flow valve in accordance with the output of the rotation speed determination means. The configuration is as follows.

A sixth means for achieving the sixth object comprises a first temperature sensor for detecting a refrigerant temperature at an inlet side of the hot water-to-refrigerant heat exchanger, and a first temperature sensor for detecting the temperature of the hot water-to-refrigerant heat exchanger. A second temperature sensor for detecting a refrigerant temperature at an outlet side, a first calculating means for calculating a difference between detection signals of the first and second temperature sensors, and determining whether a result of the calculation is within a set range. A first determination unit that performs the calculation, a first comparison unit that compares a calculation result of the indoor load calculation unit with a set value, and determines whether a calculation result of the indoor load calculation unit is less than a set value based on the comparison result. Fifth determination means, setting means for setting the set range to a value higher than normal when the determination result is less than a set value, and opening of the expansion valve when the determination result of the first determination means is out of the set range And second control means for controlling the Than it is.

A seventh means for achieving the seventh object is a receiving section for receiving a start signal of a heating operation, a fifth calculating means for calculating an elapsed time from the reception of the signal, and a calculating means for the same. A second comparing means for comparing the result with the set value, a sixth determining means for determining whether or not the operation result has become a set value based on the comparison result, and an expansion valve until the result of the determination becomes the set value. Sixth control means for controlling the opening to the maximum and the opening of the flow valve to the minimum is provided.

Eighth means for achieving the eighth object comprises a third temperature sensor for detecting the temperature of hot water on the inlet side of the hot water-to-refrigerant heat exchanger, and a detection of the third temperature sensor. Sixth calculating means for calculating the amount of change in the signal, integrating means for integrating the arithmetic result, third comparing means for comparing the integrated result with a set value, and calculating the integrated result based on the comparison result. And a seventh control means for controlling the opening of the flow valve to a minimum when the result of the determination exceeds a set value.

A ninth means for achieving the ninth object includes a fourth temperature sensor for detecting a hot water temperature at an outlet side of the hot water-refrigerant heat exchanger, and a detecting means for detecting the fourth temperature sensor. Fourth comparing means for comparing the signal with the set value, eighth determining means for determining whether the detected temperature has fallen below the set value based on the comparison result, and hot water when the determination result falls below the set value. Signal transmitting means for transmitting a signal to be supplied;
An eighth control means for opening the flow valve is provided.

Further, the first to achieve the tenth object is as follows.
A first temperature sensor that detects a refrigerant temperature on the inlet side of the hot water-to-refrigerant heat exchanger; a second temperature sensor that detects a refrigerant temperature on the outlet side of the hot water-to-refrigerant heat exchanger; First calculating means for calculating the difference between the detection signals of the first and second temperature sensors, first determining means for determining whether or not the calculation result is within a set range; Ninth control means for closing the expansion valve if the value is below the lower limit value, seventh operation means for calculating the elapsed time since the expansion valve was operated, and a ninth control means for comparing the calculation result with a set value. A fifth comparing means, a ninth determining means for determining whether or not the calculation result of the seventh calculating means has reached a set value based on the comparison result, and a flow rate when the determination result has not reached the set value. Tenth to prohibit the valve from opening
And a control means.

[0043]

According to the first aspect of the present invention, hot water is guided from a water heater or the like during a heating operation to a hot water-refrigerant heat exchanger, and the hot water and the refrigerant are introduced into the hot water-refrigerant heat exchanger. Since the refrigerant evaporates by performing heat exchange, the product structure can be simplified, and the hot water-to-refrigerant heat exchanger has a structure in which the flow direction of the refrigerant and the flow direction of the hot water are parallel. Even if the temperature of the hot water at the inlet of the vessel fluctuates, the outlet temperature of the refrigerant is hardly affected, and a stable operation of the refrigerant can be ensured at all times .
Open / close valve provided in the refrigerant heating circuit on the outlet side of
Refrigeration cycle that collects refrigerant by setting
To reduce the volume inside
Refrigerant is introduced inside and heated by hot water, so refrigerant recovery time
And heating start-up performance can be improved.

[0044]

Further, the configuration of the second means detects the refrigerant temperature on the inlet side and the refrigerant temperature on the outlet side of the hot water / refrigerant heat exchanger, and sets the expansion valve and the flow valve so that the difference falls within a set range. Is operated, the refrigerant circulation amount and the hot water flow rate are simultaneously controlled, and the refrigerant can be immediately brought into an appropriate state.

Further, the configuration of the third means detects the temperature of the refrigerant on the inlet side and the temperature of the refrigerant on the outlet side of the hot water / refrigerant heat exchanger, and adjusts the opening degree of the expansion valve so that the difference falls within a set range. And the hot water temperature at the inlet side and the hot water temperature at the outlet side of the hot water-to-refrigerant heat exchanger are detected, and the opening of the flow valve is controlled so that the difference falls within the set range. And the hot water flow rate can be controlled independently, and the capacity variable width can be expanded.

Further, according to the configuration of the fourth means, during the heating operation, the temperature of the refrigerant on the inlet side of the hot water-to-refrigerant heat exchanger and the temperature of the refrigerant sucked into the compressor are detected so that the difference falls within a set range. During cooling operation, the refrigerant saturation temperature at the outlet of the outdoor heat exchanger and the temperature of the refrigerant drawn into the compressor are detected during cooling operation, and the expansion valve is controlled so that the difference falls within the set range. Since the opening is controlled, one temperature sensor can be shared for cooling and heating, reducing costs and
Control can be simplified.

According to the fifth means, the rotational speed of the compressor is set to a value corresponding to the indoor load, and the opening of the expansion valve and the opening of the flow valve correspond to the rotational speed of the compressor. , It is possible to immediately respond to changes in indoor load.

Further, the configuration of the sixth means detects the refrigerant temperatures on the inlet side and the outlet side of the hot water / refrigerant heat exchanger and controls the opening of the expansion valve so that the difference falls within a set range. When the required capacity of the room is small, the setting range is set to a higher value than usual, so that the heating degree of the suction refrigerant of the compressor increases, and the specific volume of the suction refrigerant increases. Low-capacity operation can be realized.

Further, according to the configuration of the seventh means, when the heating operation is started, the opening degree of the expansion valve is set to the maximum and the opening degree of the flow valve is set to the minimum for a predetermined time. It is possible to reduce the flow rate, prevent abnormal heating of the refrigerant, and improve the start-up performance.

Further, according to the configuration of the eighth means, the temperature of the hot water to the inlet of the refrigerant heat exchanger is detected, the change is integrated, and if the integrated value exceeds the set value, hunting is reduced. Is determined, the flow valve is set to the minimum opening for a certain period of time, the temperature difference between the hot water and the refrigerant heat exchanger on the inlet side and the outlet side is ensured, and the heating amount of the water heater that supplies hot water is stabilized. Therefore, it is possible to recover from the hunting phenomenon.

According to the configuration of the ninth means, when the hot water temperature at the outlet side of the hot water / refrigerant heat exchanger falls below the set value during the cooling operation, a signal for supplying hot water is transmitted and the flow valve is opened. Therefore, the hot water circulates in the hot water pipe, and the freezing and puncturing of the hot water pipe can be prevented.

Further, according to the tenth aspect , the refrigerant temperature on the inlet side and the refrigerant temperature on the outlet side of the hot water / refrigerant heat exchanger are detected, and if the difference is smaller than the set range, the expansion valve is closed. Since the operation of the flow valve is prohibited for a certain period of time, the amount of refrigerant heating does not become excessive with respect to the amount of circulating refrigerant, so that excessive heating and hunting can be prevented.

[0054]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description is omitted.

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to a first embodiment of the present invention. As shown in FIG.
1, four-way valve 102, outdoor heat exchanger 103, first check valve 104, expansion valve 105, indoor heat exchanger 106, four-way valve 1
A second check valve 107 and a suction pipe 108 are sequentially connected through a pipe through the other end of the second valve 02 to constitute a heat pump refrigeration cycle returning to the compressor 101. And the first check valve 10
A refrigerant heating circuit 110 is branched and connected to the suction pipe 108 from a communication portion between the expansion valve 105 and the expansion valve 105 via an electromagnetic valve 109. A hot water-to-refrigerant heat exchanger 1 is provided in the refrigerant heating circuit 110, and the hot water pipe 2 of the hot water-to-refrigerant heat exchanger 1 is provided with a flow valve 3. FIG. 2
FIG. 1 is a structural view of a hot water-refrigerant heat exchanger 1 of an air conditioner according to a first embodiment of the present invention. As shown in the drawing, a hot water pipe 2 through which hot water flows through a hot water-refrigerant heat exchanger 1 and a refrigerant through which refrigerant flows. It has a configuration in which the pipes 4 are installed so that the flow directions are parallel.

The operation of the above configuration will be described. During the cooling operation, the refrigerant flows as indicated by the solid arrow,
The high-temperature and high-pressure refrigerant discharged from the compressor 101 passes through the four-way valve 102 and the outdoor heat exchanger 103, where it condenses and liquefies by exchanging heat with outdoor air. Thereafter, the pressure is reduced by the expansion valve 105 through the first check valve 104 and enters the indoor heat exchanger 106. Here, the room is cooled by exchanging heat with room air and evaporating. Then four-way valve 10
2 and the second check valve 107 and the suction pipe 108 to return to the compressor 101.

During the heating operation, the four-way valve is switched so that the refrigerant flows in the direction of the dashed arrow. The high-temperature and high-pressure refrigerant discharged from the compressor 101 passes through the indoor heat exchanger 106, where it exchanges heat with room air to heat the room. After that, after being adjusted to an appropriate flow rate by the expansion valve 105,
The refrigerant enters the refrigerant heating circuit 110 by the first check valve 104, and flows into the hot water-refrigerant heat exchanger 1 through the electromagnetic valve 109. Here, after evaporating by heat exchange with hot water,
It passes through the suction pipe 108 and returns to the compressor 101. Here, in the hot water-refrigerant heat exchanger 1, the flow rate valve 3 provided in the hot water pipe 2 adjusts the flow rate of the hot water to heat the refrigerant. In the hot water-refrigerant heat exchanger 1, the refrigerant flows through the refrigerant pipe 4 in the direction of the solid line arrow as shown in FIG. 2, and the hot water flows through the hot water pipe 2 in the direction of the broken line arrow. . The refrigerant is heated by the hot water while the two fluids are flowing in parallel.

FIG. 3 is a graph comparing data obtained in an evaluation experiment of a hot water-refrigerant heat exchanger. The vertical axis indicates temperature, and the horizontal axis indicates time change. The data indicated by the solid line is the air conditioner according to the first embodiment of the present invention, and the hot water pair when the heating operation is performed using the hot water / refrigerant heat exchanger 1 in which the flow direction of the hot water and the flow direction of the refrigerant are parallel. 3 shows the refrigerant temperature at the outlet side of the refrigerant heat exchanger 1. In addition, the data indicated by the dotted line is a method that has been conventionally used, and the refrigerant at the outlet side of the heat exchanger when a heating operation is performed using a heat exchanger having a structure in which the flow direction of the hot water and the flow direction of the refrigerant are opposite to each other. Shows the temperature. A commercially available water heater is used as a heat source for supplying hot water, and the hot water supply temperature is set at 80 ° C., but the operation is usually performed with a fluctuation range of about 10 deg. The temperature of the refrigerant flowing into the hot water-to-refrigerant heat exchanger 1 is about 40 ° C., evaporates and evaporates by heat exchange with the hot water, and then flows out after being further heated by about 3 deg. As is clear from the graph of FIG. 3, the air conditioner of the first embodiment of the present invention is hardly affected by the temperature fluctuation of the hot water and the fluctuation width falls within 3 deg. The fluctuation range is also close to 10 deg, which indicates that the temperature fluctuation is directly affected by the temperature fluctuation.

As described above, according to the air conditioner of the first embodiment of the present invention, the hot water-to-refrigerant heat exchanger 1 is provided in the refrigerant heating circuit 110, and the hot water-to-refrigerant heat exchanger 1 is provided during the heating operation. Since the refrigerant is heated by exchanging heat with the hot water adjusted to an appropriate flow rate by the flow valve, a combustion unit or the like is unnecessary, so that the product can be downsized, and the structure of the hot water-to-refrigerant heat exchanger 1 can be reduced. Since the hot water pipe 2 through which the hot water flows and the refrigerant pipe 4 through which the refrigerant flows are installed so that the flow directions are parallel, stable operation can be performed even when the temperature of the hot water fluctuates.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

FIG. 4 is a refrigeration cycle diagram of an air conditioner according to a second embodiment of the present invention. As shown in FIG. 4, an on-off valve 5 is provided in a refrigerant heating circuit 110 on the outlet side of the hot water / refrigerant heat exchanger 1. The configuration is provided.

The above configuration will be described with reference to FIG. FIG. 5 is a diagram illustrating an operation state of the air-conditioning apparatus according to the second embodiment of the present invention at the time of refrigerant recovery. At the start of the heating operation, a refrigerant recovery operation for recovering the refrigerant accumulated in the outdoor heat exchanger 103 to the heating recovery side is performed. The operation of each part at that time is such that the four-way valve 102 is switched to the energized state, that is, the heating side, and the expansion valve 105 is set to the maximum use opening (EVPmax). The solenoid valve 109 is set to an energized state, that is, an open state, the on-off valve 5 is set to a closed state, and the compressor 101 is operated. Here, the refrigerant accumulated in the outdoor heat exchanger 103 is recovered from the suction side of the compressor 101 and guided to the indoor heat exchanger 106 and the hot water-refrigerant heat exchanger 1 side. Therefore, the refrigerant in the hot water-to-refrigerant heat exchanger 1, which is the portion that heats the refrigerant, is not recovered, so that the refrigerant recovery time can be shortened, and the refrigerant is heated by the hot water in the hot water-to-refrigerant heat exchanger 1 during the refrigerant recovery operation. So the quick warming effect can be enhanced.

As described above, according to the second embodiment of the present invention,
Since the on-off valve 5 is provided in the refrigerant heating circuit 110 on the outlet side of the hot water-to-refrigerant heat exchanger 1, it is possible to provide an air conditioner in which the refrigerant recovery time at the time of starting the heating operation is shortened and the quick heating effect is improved.

Next, a third embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first and second embodiments are designated by the same reference numerals, and detailed description is omitted.

FIG. 6 is a refrigeration cycle diagram of an air conditioner according to a third embodiment of the present invention, and FIG. 7 is a control block diagram of the third embodiment of the present invention. As shown in the figure, a first temperature sensor 6 for detecting a refrigerant temperature on the inlet side of the hot water-to-refrigerant heat exchanger 1 and a second temperature sensor for detecting a refrigerant temperature on the outlet side of the hot water-to-refrigerant heat exchanger 1 7, the first temperature sensor 6 and the second
A first calculating means 8 for calculating the difference between the detection signals of the temperature sensors 7, a first determining means 9 for determining whether the calculation result is within a set range, and an expansion when the determination result is outside the set range. The first control means 10 for controlling the opening of the valve 105 and the flow valve 3 is provided. The first calculating means 8 and the first judging means 9 are constructed in a microcomputer, and the first control means 10 is a first storage unit storing operation steps of the expansion valve 105 and the flow valve 3. 11 and a first drive circuit 12 for actually operating the expansion valve 105 and the flow valve 3.

The operation of the above configuration will be described with reference to FIGS. 8 and 9. FIG. 8 is a flowchart of the air conditioner according to the third embodiment of the present invention, and details will be described along the flow. Hot water to refrigerant temperature (T1) detected by the first temperature sensor 6 on the inlet side of the refrigerant heat exchanger 1
And the hot water / refrigerant temperature (T2) detected by the second temperature sensor 7 on the outlet side of the refrigerant heat exchanger 1 are input to the first calculating means 8. Here, the first calculating means 8 calculates the difference between the input signals and the refrigerant temperature difference (ΔTr = T2−T1), and outputs the difference to the first determining means 9. The first determination means 9 determines that the refrigerant temperature difference (△ Tr) is within a preset range (TrL
To TrH). If it is within the set range, the expansion valve 105 and the flow valve 3 maintain the current opening, and if it is outside the set range, the refrigerant temperature difference (ΔT
The value of r) is output to the first control means 10. An operation step of the expansion valve 105 corresponding to the refrigerant temperature difference (ΔTr) is stored in a first storage unit in the first control means 10, and thereafter, an operation step of the expansion valve (ΔEVP) and an operation step of the flow valve 3 are performed. A flow valve operation step (△ FVP) is stored, and an expansion valve operation step (△ EVP) and a flow valve operation step (△ FVP) corresponding to the inputted refrigerant temperature difference (△ Tr).
Is output to the first drive circuit 12. The first drive circuit 12 operates the expansion valve 105 and the flow valve 3 according to the input signal. FIG. 9 is an operation diagram of the expansion valve 105 and the flow valve 3 of the air-conditioning apparatus according to the third embodiment of the present invention, and shows the difference in refrigerant temperature (ΔT
r) and the expansion valve operation step (△ EVP) and the flow valve operation step (△ FVP). As shown in the figure, the refrigerant temperature difference (△ Tr) is the upper limit value (Tr
If H is larger than H), that is, if the refrigerant is overheated, the expansion valve operation step (△ EVP) operates in the positive direction, that is, opens, and the flow valve operation step (△ FVP) operates in the negative direction, that is, closes. Conversely, when the refrigerant temperature difference (△ Tr) is smaller than the lower limit value (TrL) of the set range, that is, when the refrigerant is slightly liquid back, the expansion valve operation step (△ EV
P) operates in the negative direction, that is, closes, and the flow valve operation step (△ FVP) operates in the positive direction, that is, opens. Also,
As the refrigerant temperature difference (ΔT) becomes larger than the upper limit value (TrH) of the set range, the expansion valve operation step (ΔEVP) increases in the positive direction, and the flow valve operation step (ΔFVP) increases in the negative direction. As the difference (△ Tr) becomes smaller than the lower limit (TrL) of the setting range, the expansion valve operation step (△ EVP) increases in the minus direction, and the flow valve operation step (△ FVP) increases in the plus direction. Therefore, even if the state of the refrigerant greatly deviates from the set range, it is possible to immediately lead to an appropriate heating amount.

As described above, according to the third embodiment of the present invention,
The temperature of the refrigerant on the inlet side and the outlet side of the hot water-to-refrigerant heat exchanger 1 is detected, and the openings of the expansion valve 105 and the flow valve 3 are controlled so that the difference falls within a set range. Control.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The same parts as those in the first, second and third embodiments are denoted by the same reference numerals, and detailed description is omitted.

FIG. 10 is a refrigeration cycle diagram of a fourth embodiment of the present invention, and FIG. 11 is a control block diagram of a fourth embodiment of the present invention. As shown in the figure, a first temperature sensor 6 for detecting a refrigerant temperature on the inlet side of the hot water-to-refrigerant heat exchanger 1 and a second temperature sensor for detecting a refrigerant temperature on the outlet side of the hot water-to-refrigerant heat exchanger 1 7, a third temperature sensor 13 for detecting the hot water temperature on the inlet side of the hot water-to-refrigerant heat exchanger 1, a fourth temperature sensor 14 for detecting the hot water temperature on the outlet side of the hot water-to-refrigerant heat exchanger 1, and A first calculating means 8 for calculating a difference between detection signals of the first temperature sensor 6 and the second temperature sensor 7, a first determining means 9 for determining whether the calculation result is within a set range, When the determination result is out of the set range, the expansion valve 10
A second control means 15 for controlling the opening degree of the fifth temperature sensor 5, a second calculation means 16 for calculating a difference between detection signals of the third temperature sensor 13 and the fourth temperature sensor 14, and a result of the calculation being within a set range. A second judging means 17 for judging whether the flow rate is within the range and a third control means 18 for controlling the opening of the flow valve 3 when the judgment result is out of the set range are provided. The first calculating means 8, the first determining means 9, the second calculating means 16 and the second determining means 17 are constructed in a microcomputer, and the second control means 15 operates the operation step of the expansion valve 105. And a second drive circuit 20 that actually operates the expansion valve 105. In addition, the third control unit 18 stores a third storage unit 21 that stores operation steps of the flow valve 3,
And a third drive circuit 22 for actually operating the flow valve 3.

The operation of the above configuration will be described with reference to FIGS. FIG. 12 is a flowchart of the air conditioner according to the fourth embodiment of the present invention, and details will be described along the flow. The hot water-to-refrigerant temperature (T) detected by the first temperature sensor 6 on the inlet side of the refrigerant heat exchanger 1
1) and the hot water-to-refrigerant temperature (T2) detected by the second temperature sensor 7 at the outlet side of the refrigerant heat exchanger 1 are input to the first calculating means 8. The first calculation means 8 calculates the difference between the input signals, and thereafter calculates the refrigerant temperature difference (ＴTr = T2−T1) and outputs the difference to the first determination means 9. In the first judging means 9, the refrigerant temperature difference (ΔTr) falls within a preset range (TrL to T
rH). If it is within the set range, the expansion valve 105 holds the current opening, and if it is outside the set range, the value of the refrigerant temperature difference (差 Tr) is output to the second control means 15. The second in the second control means 15
The operation step of the expansion valve 105 corresponding to the refrigerant temperature difference (、 Tr), and thereafter the expansion valve operation step (△
EVP) is stored, and an expansion valve operation step (△ EVP) corresponding to the refrigerant temperature difference (△ Tr) is output to the second drive circuit 20. The second drive circuit 20 operates the expansion valve 105 according to the input signal. Also, the third
Of the hot water to the inlet side of the refrigerant heat exchanger 1 (T3) detected by the temperature sensor 13 of FIG.
Is input to the second calculating means 16. Here, the second calculating means 16 calculates the difference between the input signals and the hot water temperature difference (ΔTw = T3-T4), and calculates the difference between the input signals.
7 is output. In the second determination means 17, the hot water temperature difference (△
(Tw) is within a preset range (TwL to TwH). If it is within the set range, the flow valve 3 holds the current opening, and if it is out of the set range, it outputs the value of the hot water temperature difference (ΔTw) to the third control means 18. The operation step (△ FVP) of the flow valve 3 corresponding to the refrigerant temperature difference (△ Tw) is stored in the third storage unit 21 in the third control means 18, and the hot water temperature difference (△ T
The operation step (△ FVP) of the flow valve 3 corresponding to w) is output to the third drive circuit 22. The third drive circuit 22 operates the flow valve 3 according to the input signal. FIG. 13 shows an expansion valve 10 of an air conditioner according to a fourth embodiment of the present invention.
FIG. 5 is an operation diagram of FIG. 5, illustrating a relationship between a refrigerant temperature difference (ΔTr) and an expansion valve operation step (ΔEVP). As shown in the figure, the refrigerant temperature difference (△ Tr) is the upper limit value (Tr
H), that is, when the refrigerant is overheated, the expansion valve operation step (△ EVP) is in the positive direction, that is, opens, and the refrigerant temperature difference (△ Tr) is lower than the lower limit value (T
rL), that is, when the refrigerant is slightly liquid back, the expansion valve operation step (△ EVP) is performed in the minus direction.
That is, the closing operation is performed. Also, as the refrigerant temperature difference (△ Tr) becomes larger than the upper limit value (TrH) of the set range, the expansion valve operation step (△ EVP) becomes larger in the plus direction, and the refrigerant temperature difference (△ Tr) becomes lower limit value (TrL) of the set range. ), The operation step (△ EVP) of the expansion valve increases in the negative direction. Therefore, the refrigerant can be immediately brought into an appropriate state. FIG. 14 is an operation diagram of the flow valve 3 of the air-conditioning apparatus according to the fourth embodiment of the present invention, in which the hot water temperature difference (ΔTw) and the flow valve operation step (弁).
FVP).

As shown in the figure, when the hot water temperature difference (△ Tw) is larger than the upper limit value (TwH) of the set range, that is, when the hot water flow rate that matches the refrigerant circulation amount cannot be secured, the flow valve operation step (△ FVP) is in the plus direction, that is, the opening operation is performed.
L), that is, when the hot water flow rate is excessive with respect to the refrigerant circulation amount, the flow valve operation step (△ FV
P) moves in the minus direction, that is, the closing operation. Also, as the hot water temperature difference (△ Tw) becomes larger than the upper limit value (TwH) of the setting range, the operation step (△ FVP) of the flow valve increases in the plus direction, and the hot water temperature difference (△ Tw) becomes the lower limit value (設定 Tw) of the setting range. The operation step (△ FVP) of the flow valve increases in the negative direction as the value becomes smaller than (TwL). Therefore, the flow rate of the hot water can be immediately led to a value corresponding to the refrigerant circulation amount. The setting range (TrL to TrH) of the refrigerant temperature difference (ΔTr) is such that the refrigerant is slightly overheated from the saturated vapor line, that is, 0.5 deg to 4 deg.
Set to about. The setting range (TwL to TwH) of the hot water temperature difference (△ Tw) is the refrigerant circulation amount, that is, the compressor 10
It varies with the number of rotations of 1. FIG. 15 shows the intermediate value (TwM) of the setting range (TwL to TwH) of the hot water temperature difference (ΔTw) of the air conditioner according to the fourth embodiment of the present invention and the compressor 101.
And the intermediate value (TwM) of the set range decreases as the rotational speed of the compressor 101 increases, that is, as the refrigerant circulation amount increases, as shown in FIG. The intermediate value (TwM) of the set range is large, that is, the flow rate of the hot water is small as the rotation speed of the compressor 101 is small, that is, the refrigerant circulation amount is small.

As described above, according to the fourth embodiment of the present invention,
The refrigerant temperature on the inlet side and the outlet side of the hot water-to-refrigerant heat exchanger 1 is detected, the opening degree of the expansion valve 105 is controlled so that the difference falls within a set range, and the inlet side of the hot water-to-refrigerant heat exchanger 1 is detected. And the temperature of the hot water on the outlet side are detected, and the opening of the flow valve 3 is controlled so that the difference falls within the set range. Therefore, the state of the refrigerant is appropriately maintained, and the appropriate flow rate of the hot water with respect to the refrigerant circulation amount is maintained. To improve the capability control performance.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The same parts as those in the first, second, third and fourth embodiments are denoted by the same reference numerals, and detailed description is omitted.

FIG. 16 is a refrigeration cycle diagram of an air conditioner according to a fifth embodiment of the present invention, and FIG. 17 is a control block diagram of the fifth embodiment. As shown in the figure, a first temperature sensor 6 for detecting a refrigerant temperature on the inlet side of the hot water-refrigerant heat exchanger 1
And a four-way valve 102 branching between the outdoor heat exchanger 103 and the first check valve 104 via the capillary tube 23.
Pipe 24 connected between the first check valve 107 and the second check valve 107
And a fifth provided on the low pressure side of the capillary tube 23.
Temperature sensor 25, a sixth temperature sensor 26 for detecting the temperature of the refrigerant sucked into the compressor 101, a third judging means 27 for judging whether the operation state is cooling or heating, and the judgment result is for heating. A third calculating means 2 for calculating a difference between detection signals of the first temperature sensor 6 and the sixth temperature sensor 26 at a given time;
8, a fourth calculating means 29 for calculating a difference between the detection signals of the fifth temperature sensor 25 and the sixth temperature sensor 26 when the result of the determination by the third determining means 27 is cooling, and a third calculation Fourth determining means 30 for determining whether the calculation result of the means 28 and the fourth calculating means 29 is within a set range, and fourth control for controlling the opening of the expansion valve 105 when the determined result is out of the set range. And means 31 are provided. The third determining means 27, the third calculating means 28, the fourth calculating means 29 and the fourth determining means 30 are constructed in a microcomputer, and the fourth control means 31 is provided for the expansion valve 1
The fourth storage unit 32 storing the operation steps 05
And the fourth drive circuit 33 for actually operating the expansion valve
It is composed of

The operation of the above configuration will be described with reference to FIGS. 18 and 19. FIG. 18 shows the fifth embodiment of the present invention.
It is a flowchart of the air conditioner of an Example, and demonstrates in detail along the flow. A signal for distinguishing between the heating operation and the cooling operation, for example, an operation instruction signal from the room, is input to the third determination means 27. The third determination means 27 determines whether the operation is a heating operation or a cooling operation based on the input operation instruction signal. If the determination result is the heating operation, the temperature of the hot water to the refrigerant on the inlet side of the refrigerant heat exchanger 1 (T1) detected by the first temperature sensor 6 and the compressor detected by the sixth temperature sensor 26 The suction refrigerant temperature (T6) is input to the third calculating means 28. Here, the third calculating means 28 calculates the difference between the input signals and the refrigerant temperature difference (ΔTr = T1−T6).
Is calculated and output to the fourth determination means 30. When the determination result is the cooling operation, the refrigerant saturation temperature (T5) detected by the fifth temperature sensor 25 and the compressor suction refrigerant temperature (T6) detected by the sixth temperature sensor 26 are set to the fourth temperature. Is input to the calculating means 29. Here, the fourth calculating means 29 calculates the difference between the input signals and the refrigerant temperature difference (ΔTr =
T5−T6) is calculated and output to the fourth determination unit 30. In the fourth determination means 30, the refrigerant temperature difference (△ Tr) which is the calculation result of the third calculation means 28 or the fourth calculation means 29 is within a preset range (TrL to TrH).
It is determined whether or not it has entered. If it is within the set range, the expansion valve 105 holds the current opening, and if it is outside the set range, it outputs the value of the refrigerant temperature difference (△ Tr) to the fourth control means 31. A fourth storage unit 32 in the fourth control means 31 stores an expansion valve 10 corresponding to the refrigerant temperature difference (△ Tr).
5, the operation step of the expansion valve (動作 EV
P) is stored, and an expansion valve operation step (△ EVP) corresponding to the refrigerant temperature difference (△ Tr) is output to the fourth drive circuit 33. The fourth drive circuit 33 operates the expansion valve 105 according to the input signal. FIG. 19 is an operation diagram of the expansion valve 105 of the air-conditioning apparatus according to Embodiment 5 of the present invention.
VP). As shown in the figure, when the refrigerant temperature difference (△ Tr) is larger than the upper limit value (TrH) of the set range, that is, when the refrigerant is overheated, the expansion valve operation step (△ EVP) is in the positive direction, that is, the opening operation is performed. When the refrigerant temperature difference (△ Tr) is smaller than the lower limit value (TrL) of the set range, that is, when the refrigerant is slightly liquid back, the expansion valve operation step (△ EVP) performs the minus direction, that is, the closing operation. Also, as the refrigerant temperature difference (△ Tr) becomes larger than the upper limit value (TrH) of the set range, the expansion valve operation step (△ Tr)
EVP) is large in the positive direction, and the operation step (に EVP) of the expansion valve is large in the negative direction as the refrigerant temperature difference (△ Tr) becomes smaller than the lower limit (TrL) of the set range. Further, the temperature of the hot water to the refrigerant on the inlet side of the refrigerant heat exchanger 1 during heating and the saturation temperature during cooling are all the same as the temperature on the saturated vapor line, and the temperature of the refrigerant sucked into the compressor 101 is saturated vapor. Therefore, the control target range of the refrigerant temperature difference (ΔTr) is set to a state in which the refrigerant is slightly heated from the saturated vapor line, that is, about 0.5 deg to 4 deg.

As described above, according to the air conditioner of the fifth embodiment of the present invention, the temperature of the refrigerant on the inlet side of the hot water / refrigerant heat exchanger 1 and the temperature of the refrigerant sucked into the compressor 101 are detected during the heating operation. The opening degree of the expansion valve 105 is controlled so that the difference falls within the set range, and during the cooling operation, the saturation temperature of the refrigerant and the temperature of the refrigerant drawn into the compressor 101 are detected so that the difference falls within the set range. Since the opening degree of the expansion valve 105 is controlled, the temperature sensor is used for both cooling and heating, so that the cost can be reduced and the control can be simplified.

Next, a sixth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The same parts as those in the first, second, third, fourth and fifth embodiments are designated by the same reference numerals, and the detailed description is omitted.

FIG. 20 is a control block diagram of an air conditioner according to a sixth embodiment of the present invention. As shown in the figure, an indoor load calculating means 34 for calculating the required indoor capacity and a compressor 101 based on the calculation result. Speed determining means 3 for determining the speed of rotation
5, an inverter circuit 36 for operating the compressor 101 at the determined rotational speed, and a fifth for determining the opening of the expansion valve 105 and the opening of the flow valve 3 according to the output of the rotational speed determining means 35. The configuration is such that a control means 37 is provided. The indoor load calculating means 34 and the rotation speed determining means 35 are constructed in a microcomputer, and the inverter circuit 36 is electrically connected to the compressor 101. Fifth control means 37
The fifth storage unit 38 stores the set opening of the expansion valve 105 and the flow valve 3, and the fifth drive circuit 39 that actually operates the expansion valve 105 and the flow valve 3.

The operation of the above configuration will be described with reference to FIGS. 21 and 22. FIG. 21 shows the sixth embodiment of the present invention.
It is a flowchart of the air conditioner of an Example, and demonstrates in detail along the flow. The indoor load calculation means 34
For example, a room temperature is detected, a difference between the detected room temperature and the indoor set temperature is calculated, and the calculated difference is transmitted to the rotation speed determining unit 35 as a required capacity (ΔQ). The rotation speed determining means 35 stores the rotation speed of the compressor 101 corresponding to the required capacity (△ Q), and stores the corresponding rotation speed in the inverter circuit 36 and the fifth control means 37.
Output to Here, the relationship between the required capacity (△ Q) and the rotation speed of the compressor 101 is such that the larger the required capacity (△ Q), the higher the rotation of the compressor 101, and the smaller the required capacity (△ Q), the smaller the compression. The machine 101 is at low rotation. Inverter circuit 36
Operates the compressor 101 at the input rotation speed. The fifth storage unit 38 in the fifth control unit 37 stores the compressor 1
The expansion valve setting opening (EVSP) and the flow valve setting opening (FVSP) corresponding to the rotation speed of 01 are stored, and the difference between the expansion valve setting opening (EVSP) and the current expansion valve opening (△) is stored. E
VP) and the flow valve set opening (FVS)
P) and the current flow valve opening degree (△ FVP) is calculated,
The calculation result is output to the fifth drive circuit 39. The fifth drive circuit 39 controls the expansion valve 10 according to the input signal.
5 and the flow valve 3 are operated. FIG. 22 shows the compressor 101.
FIG. 4 is a diagram showing the relationship between the rotation speed of the compressor, the expansion valve set opening (EVSP), and the flow valve set opening (FVSP);
01 is higher, the expansion valve set opening (EVSP)
The flow valve set opening (FVSP) also becomes a large value, and conversely, as the rotational speed of the compressor 101 decreases, the expansion valve set opening (EV
SP) and the flow valve set opening (FVSP) are small values. Further, the values of the expansion valve set opening (EVSP) and the flow valve set opening (FVSP) are experimentally obtained, and are optimal values for the required capacity (△ Q). Therefore, when the required capacity (△ Q) changes during operation, the compressor 101 is immediately set to the rotation speed corresponding to the air-conditioning load (△ Q), and the expansion valve 105 and the flow valve 3
Also operates at an opening suitable for the required capacity (△ Q).

As described above, according to the air conditioner of the sixth embodiment of the present invention, the required capacity in the room is calculated, the number of revolutions of the compressor 101 is controlled according to the calculation result, and the expansion valve 105 and the expansion valve 105 are controlled. The opening of the flow valve 3 is adjusted by the compressor 101
Since the opening is set to correspond to the rotation speed of
Q) can be immediately followed.

Next, a seventh embodiment of the present invention will be described with reference to FIGS. The first, second,
The same parts as those of the third, fourth, fifth and sixth embodiments are designated by the same reference numerals, and the detailed description is omitted.

FIG. 23 is a control block diagram of an air conditioner according to a seventh embodiment of the present invention. As shown in FIG. 23, a first temperature sensor for detecting the temperature of refrigerant on the inlet side of the hot water / refrigerant heat exchanger 1 is shown. 6, a second temperature sensor 7 for detecting a refrigerant temperature on the outlet side of the hot water-refrigerant heat exchanger 1, and a first temperature sensor 6
Calculating the difference between the detection signal of the second temperature sensor 7 and the first temperature sensor 7
Calculating means 8, a first determining means 9 for determining whether the calculation result is within the set range, an indoor load calculating means 34 for calculating the required indoor capacity, and a second comparing means for comparing the calculation result with the set value. No. 1 comparing means 40, a fifth judging means 41 for judging whether or not the calculation result of the indoor load calculating means 34 is smaller than a set value based on the comparison result. Setting means 42 for setting to a higher value, and second control means 15 for controlling the opening degree of the expansion valve 105 when the judgment result of the first judgment means 9 is out of the setting range.
Is provided. Note that the first calculation means 8,
The first judging means 9, the indoor load calculating means 34, the first comparing means 40, the fifth judging means and the setting means 42 are constructed in a microcomputer, and the second control means operates the expansion valve 105. It comprises a second storage unit 19 storing the steps and a second drive circuit 20 for actually operating the expansion valve 105.

The operation of the above configuration will be described with reference to FIG. FIG. 24 is a flowchart of the air conditioner of the seventh embodiment of the present invention, and details will be described along the flow. The temperature of the hot water to the inlet side of the refrigerant heat exchanger 1 (T1) detected by the first temperature sensor 6 and the second temperature
Water-refrigerant heat exchanger 1 detected by the temperature sensor 7
Is input to the first calculating means 8. The first calculating means 8 calculates the difference between the input signals, and thereafter calculates the refrigerant temperature difference (ΔTr = T2−T1), and outputs the difference to the first determining means 9. Further, the indoor load calculating means 34 detects, for example, room temperature, calculates a difference between the value and the indoor set temperature, and outputs the difference to the first comparing means 40 as a required capacity (△ Q). The first comparing means 40 receives the required capacity (△
Q) is compared with a preset set value (△ Qs), and the comparison result is output to the fifth determination means 41. The fifth determining means 41 determines the required capacity (△
Q) is determined to be less than a set value (） Qs), and the result of the determination is output to the setting means 42. When the required capacity (△ Q) is equal to or greater than the set value (△ Qs) as a result of the determination, the setting means 42 sets the setting range (TrL to T
rH) is set as usual. That is, 0.5 deg
Set to about 4 deg. When the required capacity (△ Q) is less than the set value (△ Qs) as a result of the determination, the setting range (TrL to TrH) of the refrigerant temperature difference (△ Tr) is set to a value higher than usual. That is, 5 deg to 10 deg
Set to about. Here, the first determination means 9 determines whether or not the refrigerant temperature difference (） Tr) is within the set range (TrL to TrH). If it is within the set range, the expansion valve 10
5 holds the current opening degree, and outputs the value of the refrigerant temperature difference (△ Tr) to the second control means 15 when the opening degree is out of the set range. The operation step (△ EVP) of the expansion valve 105 corresponding to the refrigerant temperature difference (△ Tr) is stored in the second storage unit 19 in the second control means 15, and the refrigerant temperature difference (△ Tr) is stored.
Tr) corresponding to the operation step of the expansion valve 105 (△ EV
P) is output to the second drive circuit 20. The second drive circuit 20 operates the expansion valve 105 according to the input signal. Further, the set value (ｓQs) is equal to the minimum value of the variable capacity under normal control, for example, the capacity when the compressor 101 is operated at the minimum rotation speed. Here, the required indoor capacity (△
If Q) is smaller than the set value (△ Qs), if the expansion valve 105 is controlled as usual, the capacity drops only to the set value (△ Qs), resulting in inefficient operation. However, this control is performed in the setting range of the refrigerant temperature difference (△ Tr) (TrL to
Since TrH) is set higher than that in the normal operation, the specific volume of the refrigerant sucked into the compressor 101 increases, and the refrigerant circulation amount decreases. As a result, the capacity decreases.

As described above, according to the air conditioner of the seventh embodiment of the present invention, the refrigerant temperatures on the inlet side and the outlet side of the hot water / refrigerant heat exchanger 1 are detected so that the difference falls within the set range. While controlling the opening degree of the expansion valve 105, the required capacity in the room is calculated, and when the calculation result is less than the setting, the setting range of the refrigerant temperature difference is set to a higher value than in the normal operation. Even when the amount is small, the ability can follow the throttle load.

Next, an eighth embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The same parts as those in the first, second, third, fourth, fifth, sixth and seventh embodiments are designated by the same reference numerals, and detailed description is omitted.

FIG. 25 is a control block diagram of the eighth embodiment of the present invention. As shown in FIG. 25, a receiving section 43 for receiving a start signal of a heating operation and a fifth section for calculating an elapsed time from the reception of the signal. A calculating means, for example, a first timer circuit 44, and a second comparing means 45 for comparing the calculation result with a set value
And a sixth determining means 46 for determining whether or not the calculation result has reached a set value based on the comparison result. The opening degree of the expansion valve 105 is maximized until the determination result reaches the set value. Sixth control means 47 for controlling the opening to a minimum is provided. The receiving unit 43 is installed indoors and receives an operation start signal from a remote controller or the like. The first timer circuit 44, the second comparing means 45, the sixth determining means 46 and the sixth controlling means 47 are constructed in a microcomputer.

The operation of the above configuration will be described with reference to FIGS. 26 and 27. FIG. 26 shows an eighth embodiment of the present invention.
It is a flowchart of the air conditioner of an Example, and demonstrates in detail along the flow. When the receiving unit 43 installed on the indoor side receives a heating operation start signal from a remote controller or the like,
The first timer circuit 44 starts calculating the elapsed time (Δt), and outputs the calculation result to the second comparing means 45.
The second comparing means 45 calculates the calculation result and the set value (△ ts)
And outputs the result of the comparison to the sixth determining means 46. The sixth determining means 46 determines whether or not the elapsed time (Δt) calculated by the first timer circuit 44 has reached the set value (Δts) based on the comparison result, and determines the result. Output to the sixth control means 47. The sixth control means 47 uses the opening of the expansion valve 105 until the result reaches the set value (△ ts). The maximum use opening (EVPmax)
Then, the opening of the flow valve 3 is operated to the minimum use opening (FVPmin). FIG. 26 shows an operating state of the air-conditioning apparatus according to the eighth embodiment of the present invention when the heating operation is started. A predetermined time (△
Until ts), the opening of the expansion valve 105 is set to the maximum use opening (EVPmax), and the opening of the flow valve 3 is set to the minimum use opening (FVPmin). At the start of heating, since the amount of circulating refrigerant is small, if the flow rate of hot water is large, the refrigerant will be in an excessively heated state, and even after some time, the amount of circulating refrigerant will not increase, resulting in poor start-up performance, A situation where the amount of combustion on the water heater side is not stable may occur. However, by performing control as shown in the flowchart of FIG. 25, the amount of circulating refrigerant is ensured, the flow rate of hot water is suppressed, and excessive heating is prevented.

As described above, according to the eighth embodiment of the present invention,
The elapsed time from the reception of the heating operation start signal is calculated, and the opening of the expansion valve 105 is controlled to the maximum and the opening of the flow valve 3 is controlled to the minimum until the elapsed time reaches the set time. It is possible to secure the circulation amount and improve the rising performance.

Next, a ninth embodiment of the present invention will be described with reference to FIGS. The same parts as those in the first, second, third, fourth, fifth, sixth, seventh and eighth embodiments are designated by the same reference numerals, and detailed description is omitted.

FIG. 27 is a control block diagram of an air conditioner according to a ninth embodiment of the present invention. As shown in FIG. 27, a third temperature sensor for detecting the temperature of hot water on the inlet side of the heat exchanger 1 for hot water to the refrigerant as shown in FIG. 13, sixth calculating means 48 for calculating the amount of change in the detected value, integrating means 49 for integrating the result of the calculation,
Third comparing means 50 for comparing the integration result with a set value
And a seventh determining means 51 for determining whether the integration result exceeds a set value based on the comparison result, and controlling the opening of the flow valve 3 to the minimum use opening when the determination result exceeds the set value. And a seventh control means 52 for performing the operation. The sixth calculating means 48, the integrating means 49, the third comparing means 50, the seventh determining means 51 and the seventh controlling means 52 are constructed in a microcomputer.

The operation of the above configuration will be described with reference to FIG. FIG. 29 is a flowchart of the air conditioner of the ninth embodiment of the present invention, and details will be described along the flow. The hot water temperature of the inlet side of the refrigerant heat exchanger 1 (T3) detected by the third temperature sensor 13 is output to the sixth calculating means 48 at regular intervals. The sixth calculating means 48 calculates the change amount (ΔT3) of the input outlet side hot water temperature (T3), and outputs the calculation result to the integrating means 49. The integrating means 49 integrates the variation (ΔT3) and outputs the integrated value (ΔT3) to the third comparing means 50. The third comparing means 50 calculates the integrated value (Σ △ T
3) is compared with the set value (Σ △ T3s), and the result of the comparison is output to the seventh determination means 51. Seventh determination means 51
Determines whether the integrated value (ΔT3) exceeds a set value (ΔT3s) within a predetermined time (ΔTs) based on the comparison result, and outputs the determination result to the seventh control means 52. . When the result of the determination exceeds the set value (３T3s), the seventh control means 52 controls the opening of the flow valve 3 to the minimum use opening (FVPmin). When the hunting occurs in the combustion of the water heater for some reason, the temperature of the hot water flowing into the hot water-to-refrigerant heat exchanger 1 varies from 65 ° C. to 85 ° C. Here, a value corresponding to the change amount of the hot water temperature within a predetermined time (△ Ts) when hunting occurs is stored as a set value (Σ △ T3s), and the integrated value of the change amount of the hot water temperature (ΣT3s) is stored. When (T3) exceeds the set value (T3s), the opening of the flow valve 3 is operated to the minimum opening (FVPmin) to control the flow rate of the hot water so as to stabilize combustion in the water heater.

As described above, according to the ninth embodiment of the present invention,
The change amount of the hot water to the hot water temperature at the inlet side of the refrigerant heat exchanger 1 detected by the third temperature sensor 13 is integrated, and when the integrated value exceeds a set value within a predetermined time, the opening of the flow valve 3 Is controlled to the minimum use degree, so that even if hunting of the refrigerant amount and the heating amount occurs, it is automatically restored, and the life of the compressor 101 can be improved.

Next, a tenth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same parts as those in the first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth embodiments are designated by the same reference numerals, and detailed description is omitted.

FIG. 30 is a control block diagram of an air conditioner according to a tenth embodiment of the present invention. As shown in the figure, a fourth temperature sensor for detecting the temperature of hot water at the outlet of the heat exchanger 1 for hot water and refrigerant is shown in FIG. 14, a fourth comparing means 53 for comparing a detection signal of the fourth temperature sensor 14 with a set value, and an eighth determining means 54 for determining whether or not the detection signal is below the set value based on the comparison result. A signal transmitting means 55 for transmitting a signal for supplying hot water when the determination result falls below a set value.
And an eighth control means 56 for opening the flow valve 3. Fourth comparing means 53, eighth determining means 54, signal transmitting means 55, and eighth controlling means 56
Is built in a microcomputer.

The operation of the above configuration will be described with reference to FIG. FIG. 30 is a flowchart of the air conditioner of the tenth embodiment of the present invention, and details will be described along the flow. The outlet temperature (T4) of the hot water-refrigerant heat exchanger 1 detected by the fourth temperature sensor 14 is input to the fourth comparing means 53. In the fourth comparing means 53, the input hot water-to-hot water temperature (T
4) is compared with the set value (T4s), and the result is output to the eighth determining means 54. The eighth determining means 54 determines whether or not the outlet-side hot water temperature (T4) is lower than a set value (T4s) based on the comparison result. When the set value (T4s) is lower than the set value (T4s), the determination result is output to the signal transmitting means 55 and the eighth control means 56. When the determination result is input, the signal transmitting means 55 sends a signal to supply hot water to the heat source side. The eighth control means 56 opens the flow valve 3 when the judgment result of the eighth judgment means 54 is input. Here, during the cooling operation, the portion of the hot water-refrigerant heat exchanger 1 is on the low pressure side, so that the temperature of the refrigerant decreases and the temperature of the water side also decreases. Here, the fourth temperature sensor 13 detects the water temperature, that is, the hot water temperature (T4) at the outlet side of the hot water-to-refrigerant heat exchanger 1, and its value is set to a set value (T4
s) For example, when the temperature falls below about 4 ° C., a signal is sent to supply the hot water to the heat source side, and the flow valve 3 is opened to make the hot water circulate.

As described above, according to the tenth embodiment of the present invention, as the water temperature, the hot water temperature (T4) at the outlet side of the hot water-refrigerant heat exchanger 1 is detected, and when the temperature falls below the set value (T4s). Since a signal for supplying hot water is transmitted and the flow valve 3 is opened, damage to the piping due to freezing of water can be prevented.

Next, an eleventh embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. Note that the same parts as those in the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth embodiments have the same reference numerals, and a detailed description thereof will be omitted.

FIG. 32 is a control block diagram of an air conditioner according to an eleventh embodiment of the present invention. As shown in FIG. 32, a first temperature sensor for detecting a refrigerant temperature at the inlet side of the hot water-to-refrigerant heat exchanger 1 is shown. 6 and a first calculation for calculating a difference between detection signals of the second temperature sensor 7 for detecting the refrigerant temperature on the outlet side of the hot water-refrigerant heat exchanger 1 and detection signals of the first temperature sensor 6 and the second temperature sensor 7. Means 8, a first judging means 9 for judging whether the calculation result is within a set range, and a ninth operation for closing the expansion valve 105 if the judgment result is below the lower limit value of the set range.
Control means 57, a seventh calculating means for calculating an elapsed time since the operation of the expansion valve 105, for example, a second timer circuit 58, and a fifth comparing means 59 for comparing the calculation result with a set value. And ninth determining means 60 for determining whether the operation result of the second timer circuit has reached a set value based on the comparison result. Tenth control means 6 for inhibiting operation
1 is provided.

The operation of the above configuration will be described with reference to FIG. FIG. 33 is a flowchart of the air conditioner of the eleventh embodiment of the present invention, and details will be described along the flow. Refrigerant temperature (T1) on the inlet side of the hot water-refrigerant heat exchanger 1 detected by the first temperature sensor 6 and the hot water-refrigerant heat exchanger 1 detected by the second temperature sensor
And the refrigerant temperature (T 2) on the outlet side of the above is input to the first calculating means 8. Here, the first calculating means 8 calculates the difference between the input signals and the refrigerant temperature difference (ΔTr = T2−T1), and outputs the difference to the first determining means 9. In the first determination means 9, the refrigerant temperature difference (差 Tr) falls within a preset range (TrL to
TrH) is determined, and the determination result is output to the ninth control means 57. Ninth control means 5
At 7, control is performed so that the expansion valve 105 is closed when the determination result of the first determination means 9 is below the adjustment value (TrL) of the set range. Further, the second timer circuit 58 calculates the elapsed time (Δt) since the operation of the expansion valve 105 and outputs the result to the fifth comparing means 59. Fifth
In the comparison means 59 of (3), the elapsed time (△ t) and the set value (△ t
s) and outputs the result to the ninth determining means 60. The ninth determining means 60 determines whether the elapsed time (Δt) has reached the set value (Δts) based on the comparison result, and outputs the determination result to the tenth control means 61. The tenth control means 61 controls the operation of the flow valve 3 to be prohibited until the result of the determination reaches the set value (△ ts). Here, when the refrigerant temperature difference (△ Tr) is smaller than the lower limit value (TrL) of the setting range, that is, when the refrigerant is slightly liquid back, the normal expansion valve 105 performs a closing operation to reduce the circulation amount of the refrigerant. In addition, the flow valve 3 performs an opening operation to flow a large amount of hot water to increase the amount of refrigerant heating. However, since the speed at which the refrigerant circulation amount changes is slower than the speed at which the hot water flow rate changes, if the closing operation of the expansion valve 105 and the opening operation of the flow valve 3 are performed simultaneously, the refrigerant will be in an overheated state,
The circulating amount of the refrigerant does not increase, and eventually hunting occurs on the heat source side. However, this control inhibits the operation of the flow valve 3 until the set time elapses after the closing operation of the expansion valve 105, so that excessive heating and hunting are prevented.

As described above, according to the air conditioner of the eleventh embodiment of the present invention, the refrigerant temperatures on the inlet side and the outlet side of the hot water / refrigerant heat exchanger 1 are detected, and the difference between them is the lower limit of the set range. If it is lower than this, the expansion valve 105 is closed and the elapsed time from the operation of the expansion valve 105 is calculated, and the operation of the flow valve 3 is prohibited until the value reaches a set value. Hunting can be prevented.

[0101]

As is apparent from the above embodiments, according to the present invention, a hot water-to-refrigerant heat exchanger is provided in a refrigerant heating circuit through which a refrigerant passes during heating, and the hot water-to-refrigerant heat exchanger has a hot water-to-refrigerant heat exchanger. Since the refrigerant is heated by supplying hot water from a heat source such as a water heater, the protection control accompanying combustion is not required, and since there is no combustion part, the product can be downsized. The hot water-to-refrigerant heat exchanger is composed of a refrigerant pipe through which the refrigerant flows and a hot water pipe through which the hot water flows, and is installed so that the flow directions of the refrigerant and the hot water are parallel. Operation can be performed.

Further, an on-off valve is provided in the refrigerant heating circuit on the outlet side of the hot water-refrigerant heat exchanger, and the on-off valve is closed during the refrigerant recovery operation so that only the refrigerant in the outdoor heat exchanger is recovered. The recovery operation time can be shortened and the start-up performance can be improved.

Further, since the opening degree of the expansion valve and the flow valve is controlled so that the temperature difference between the inlet side and the outlet side of the hot water-refrigerant heat exchanger falls within the set range, the refrigerant is immediately brought into an appropriate state. Can control.

The opening of the expansion valve is controlled so that the temperature difference between the refrigerant at the inlet and the outlet of the hot water-to-refrigerant heat exchanger falls within a set range. Since the flow valve is controlled so that the temperature difference of the hot water on the side becomes a preset value, the capacity variable width can be expanded, and a comfortable air-conditioned space can be provided.

During the heating operation, the hot water-to-refrigerant heat exchanger 1 is used.
The temperature of the refrigerant at the inlet of the compressor and the temperature of the refrigerant drawn into the compressor 101 are detected.
Since the temperature of the refrigerant sucked into the valve 01 is detected and the opening of the expansion valve 105 is controlled so that the difference falls within a set range, the temperature sensor is used for both cooling and heating, thereby reducing costs and simplifying control. .

Further, the rotation speed of the compressor is set to a value corresponding to the indoor load, and the opening of the expansion valve and the opening of the flow valve are set to correspond to the rotation speed of the compressor. An air conditioner that can immediately follow a change can be provided.

Further, when the indoor load is small, the set value of the difference between the refrigerant temperature on the inlet side and the outlet side of the hot water / refrigerant heat exchanger is set to a value higher than that in the normal operation, and the expansion is performed so as to reach the set value. Since the opening degree of the valve is controlled, it is possible to provide an air conditioner capable of reducing the capacity and following the load.

Further, when the heating operation is started, the opening degree of the expansion valve is fixed to the maximum and the opening degree of the flow valve is fixed to the minimum for a certain period of time, so that the rising refrigerant circulation amount is controlled so that the rising performance is improved. Can be done.

Also, the temperature of the hot water to the inlet of the refrigerant heat exchanger is detected, the amount of change is integrated, and if the value exceeds a set value, hunting is determined and the flow valve is throttled to the minimum opening to supply hot water. Since the amount of combustion on the compressor side is controlled to be stable, even if hunting occurs between the amount of refrigerant and the amount of heating, it is automatically restored, and the life of the compressor can be improved.

Further, the temperature of the hot water to the refrigerant heat exchanger is detected during the cooling operation, and when the detected temperature falls below the set value, a signal for supplying the hot water is transmitted, and the flow valve is opened to circulate the hot water. Since the control is performed, even if the refrigerant temperature of the hot water-refrigerant heat exchanger decreases during the cooling operation, it is possible to prevent the piping from being damaged due to freezing of water.

Further, when the difference between the refrigerant temperatures on the inlet side and the outlet side of the hot water-refrigerant heat exchanger is less than the set range, the expansion valve is closed and the opening operation of the flow valve is prohibited for a certain time.
The flow rate of hot water does not become excessive with respect to the circulation amount of the refrigerant, so that excessive heating and hunting can be prevented.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of an air conditioner according to a first embodiment of the present invention.

FIG. 2 is a structural diagram of a hot water-refrigerant heat exchanger of the first embodiment.

FIG. 3 shows experimental data of the first embodiment.

FIG. 4 is a refrigeration cycle diagram of an air conditioner according to a second embodiment of the present invention.

FIG. 5 is a diagram showing an operation state of the air conditioner of the second embodiment at the time of refrigerant recovery.

FIG. 6 is a refrigeration cycle diagram of an air conditioner according to a third embodiment of the present invention.

FIG. 7 is a control block diagram of the air conditioner of the third embodiment.

FIG. 8 is a flowchart of the air conditioner of the third embodiment.

FIG. 9 is an operation diagram of an expansion valve and a flow valve of the air conditioner of the third embodiment.

FIG. 10 is a refrigeration cycle diagram of an air conditioner according to a fourth embodiment of the present invention.

FIG. 11 is a control block diagram of the air conditioner of the fourth embodiment.

FIG. 12 is a flowchart of the air conditioner of the fourth embodiment.

FIG. 13 is an operation diagram of an expansion valve of the air conditioner of the fourth embodiment.

FIG. 14 is an operation diagram of a flow valve of the air conditioner of the fourth embodiment.

FIG. 15 is a diagram showing the relationship between the control target of the air conditioner of the fourth embodiment and the number of revolutions of the compressor.

FIG. 16 is a refrigeration cycle diagram of an air conditioner according to a fifth embodiment of the present invention.

FIG. 17 is a control block diagram of the air conditioner of the fifth embodiment.

FIG. 18 is a flowchart of the air conditioner of the fifth embodiment.

FIG. 19 is an operation diagram of an expansion valve of the air conditioner of the fifth embodiment.

FIG. 20 is a control block diagram of an air conditioner according to a sixth embodiment of the present invention.

FIG. 21 is a flowchart of the air conditioner of the sixth embodiment.

FIG. 22 is a diagram showing the relationship between the number of revolutions of the compressor of the air conditioner of the sixth embodiment, and the expansion valve and the flow valve.

FIG. 23 is a control block diagram of an air conditioner according to a seventh embodiment of the present invention.

FIG. 24 is a flowchart of the air conditioner of the seventh embodiment.

FIG. 25 is a control block diagram of an air conditioner according to an eighth embodiment of the present invention.

FIG. 26 is a flowchart of the air conditioner of the eighth embodiment.

FIG. 27 is a diagram showing an operating state at the time of startup of the eighth embodiment.

FIG. 28 is a control block diagram of an air conditioner according to a ninth embodiment of the present invention.

FIG. 29 is a flowchart of the ninth embodiment.

FIG. 30 is a control block diagram of an air conditioner according to a tenth embodiment of the present invention.

FIG. 31 is a flowchart of the air conditioner of the tenth embodiment.

FIG. 32 is a control block diagram of an air conditioner according to an eleventh embodiment of the present invention.

FIG. 33 is a flowchart of the air conditioner of the eleventh embodiment.

FIG. 34 is a refrigeration cycle diagram of a conventional air conditioner.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 hot water-refrigerant heat exchanger 2 hot water pipe 3 flow valve 4 refrigerant pipe 5 on-off valve 6 first temperature sensor 7 second temperature sensor 8 first calculation means 9 first determination means 10 first control means 11 1st memory | storage part 12 1st drive circuit 13 3rd temperature sensor 14 4th temperature sensor 15 2nd control means 16 2nd calculation means 17 2nd determination means 18 3rd control means 19 2nd Storage unit 20 second drive circuit 21 third storage unit 22 third drive circuit 23 capillary tube 24 bypass pipe 25 fifth temperature sensor 26 sixth temperature sensor 27 third determination means 28 third calculation Means 29 Fourth calculation means 30 Fourth determination means 31 Fourth control means 32 Fourth storage unit 33 Fourth drive circuit 34 Indoor load calculation means 35 Revolution number determination means 36 Barter circuit 37 Fifth control means 38 Fifth storage unit 39 Fifth drive circuit 40 First comparison means 41 Fifth determination means 42 Setting means 43 Receiver 44 Fifth calculation means (first timer circuit) ) 45 second comparing means 46 sixth determining means 47 sixth controlling means 48 sixth calculating means 49 integrating means 50 third comparing means 51 seventh determining means 52 seventh controlling means 53 fourth Comparison means 54 Eighth determination means 55 Signal transmission means 56 Eighth control means 57 Ninth control means 58 Seventh calculation means (second timer circuit) 59 Fifth comparison means 60 Ninth determination means 61 Tenth control means 101 Compressor 102 Four-way valve 103 Outdoor heat exchanger 104 First check valve 105 Expansion valve 106 Indoor heat exchanger 107 Second check valve 108 Suction pipe 109 Solenoid valve 1 10 Refrigerant heating circuit 111 Refrigerant heater 112 Gas burner 113 Fuel control valve

Claims (10)

(57) [Claims] 1. A compressor, a four-way valve connected to a discharge side of the compressor, an outdoor heat exchanger connected to one end of the four-way valve, and a first heat exchanger connected to the outdoor heat exchanger. A check valve, an expansion valve connected to the first check valve, an indoor heat exchanger connected between the expansion valve and the four-way valve, and connected to the other end of the four-way valve A second check valve and the second check valve;
A suction pipe connecting the check valve and the suction side of the compressor; and a refrigerant heating circuit branched from between the first check valve and the expansion valve and connected to the suction pipe via an electromagnetic valve. In the air conditioner provided with, a hot water-to-refrigerant heat exchanger is provided in the refrigerant heating circuit, a flow valve is provided in a hot water pipe of the hot water-to-refrigerant heat exchanger, and a refrigerant flows through the hot water-to-refrigerant heat exchanger. and refrigerant pipe, and consists of a hot water pipe flows the warm water was placed such that the flow of the refrigerant and the hot water is parallel, the hot water-refrigerant heat
Air with an on-off valve in the refrigerant heating circuit on the outlet side of the exchanger
Harmony equipment. 2. A first temperature sensor for detecting a refrigerant temperature on the inlet side of the hot water-to-refrigerant heat exchanger, a second temperature sensor for detecting a refrigerant temperature on the outlet side of the hot water-to-refrigerant heat exchanger,
First calculating means for calculating the difference between the detection signals of the first and second temperature sensors, first determining means for determining whether or not the calculation result is within a set range; 2. The air conditioner according to claim 1, further comprising: first control means for controlling an opening degree of the expansion valve and an opening degree of the flow rate valve . 3. A first temperature sensor for detecting a refrigerant temperature on the inlet side of the hot water-to-refrigerant heat exchanger, a second temperature sensor for detecting a refrigerant temperature on the outlet side of the hot water-to-refrigerant heat exchanger,
First calculating means for calculating the difference between the detection signals of the first and second temperature sensors, first determining means for determining whether or not the calculation result is within a set range; Second control means for controlling the degree of opening of the expansion valve, a third temperature sensor for detecting the temperature of hot water on the inlet side of the hot water-refrigerant heat exchanger, and an outlet side of the hot water-refrigerant heat exchanger. A fourth temperature sensor for detecting the temperature of the hot water, a second calculating means for calculating the difference between the detection signals of the third and fourth temperature sensors, and a fourth determining means for determining whether or not the calculated result is within a set range. The air conditioner according to claim 1, further comprising: a second determination unit; and a third control unit that controls an opening of the flow valve when the determination result is out of the set range. 4. A first temperature sensor for detecting a refrigerant temperature on the inlet side of the hot water-refrigerant heat exchanger, and a branch from between the outdoor heat exchanger and the first check valve, and a four-way via a capillary tube. A bypass pipe connected between the valve and the second check valve; a fifth temperature sensor provided on the low pressure side of the capillary tube; and a suction pipe provided for detecting a temperature of the refrigerant sucked into the compressor. A sixth temperature sensor to perform, a third determination means for determining whether the operation state is cooling or heating, and, when the determination result is heating, calculate a difference between detection signals of the first and sixth temperature sensors. A third calculating means, a fourth calculating means for calculating a difference between detection signals of the fifth and sixth temperature sensors when a result of the determination by the third determining means is cooling, It is determined whether the calculation result of the calculation means 4 is within the set range. The air conditioner according to claim 1, further comprising: a fourth determination unit configured to control an opening degree of the expansion valve when the determination result is out of the set range. 5. An indoor load calculating means for calculating a required indoor capacity, a rotational speed determining means for determining a rotational speed of the compressor from the calculation result, and an inverter for operating the compressor at the determined rotational speed. A fifth circuit for controlling the degree of opening of the expansion valve and the degree of opening of the flow valve in accordance with the output of the circuit and the rotational speed determining means;
The air conditioner according to claim 1, 2, 3, or 4, further comprising: 6. A first temperature sensor for detecting a refrigerant temperature on the inlet side of the hot water-to-refrigerant heat exchanger, a second temperature sensor for detecting a refrigerant temperature on the outlet side of the hot water-to-refrigerant heat exchanger,
First calculating means for calculating the difference between the detection signals of the first and second temperature sensors, first determining means for determining whether the calculation result is within a set range, and calculation results of the indoor load calculating means First comparing means for comparing the calculated result with the set value, fifth determining means for determining whether or not the calculation result of the indoor load calculating means is smaller than a set value based on the comparison result; And a second control means for controlling an opening degree of the expansion valve when the result of the determination by the first determination means is out of the set range. , 2, 3, 4, or 5. 7. A receiving section for receiving a start signal of a heating operation, a fifth calculating section for calculating an elapsed time from the signal reception, a second comparing section for comparing the calculation result with a set value, and Sixth determining means for determining whether the calculation result has reached a set value based on the comparison result, and controlling the opening of the expansion valve to the maximum and the opening of the flow valve to the minimum until the determination result reaches the set value. And a sixth control means for performing the control.
7. The air conditioner according to 2, 3, 4, 5 or 6. 8. A third temperature sensor for detecting a temperature of hot water on the inlet side of the hot water-to-refrigerant heat exchanger, a sixth calculating means for calculating an amount of change in a detection signal of the third temperature sensor, and Integrating means for integrating the calculation result, third comparing means for comparing the integrated result with a set value, seventh determining means for determining whether the integrated result exceeds a set value based on the comparison result, 8. The air conditioner according to claim 1, further comprising a seventh control means for controlling the opening of the flow valve to a minimum when the determination result exceeds a set value. 9. A fourth temperature sensor for detecting a hot water temperature at an outlet side of the hot water-to-refrigerant heat exchanger, a fourth comparing means for comparing a detection signal of the fourth temperature sensor with a set value, and Eighth determination means for determining whether the detected temperature has fallen below a set value based on the comparison result, signal transmission means for transmitting a signal for supplying hot water when the determination result has fallen below the set value, and opening a flow valve. 9. The air conditioner according to claim 1, further comprising an eighth control means for operating the air conditioner. 10. A first temperature sensor for detecting a refrigerant temperature on the inlet side of the hot water-to-refrigerant heat exchanger, a second temperature sensor for detecting a refrigerant temperature on the outlet side of the hot water-to-refrigerant heat exchanger, First calculating means for calculating the difference between the detection signals of the first and second temperature sensors, first determining means for determining whether or not the calculation result is within a set range; Ninth control means for closing the expansion valve if the value is below the lower limit value, seventh operation means for calculating the elapsed time since the expansion valve was operated, and a ninth control means for comparing the calculation result with a set value. A fifth comparing means, a ninth determining means for determining whether or not the calculation result of the seventh calculating means has reached a set value based on the comparison result, and a flow rate when the determination result has not reached the set value. A tenth control means for inhibiting the valve from opening. Claims provided 1, 2, 3, 4,
The air conditioner according to 5, 6, 7, 8 or 9.