JPH05215346A - Thermal transfer device - Google Patents

Abstract

PURPOSE:To cause a thermal transfer power to be less in its value and perform a stable heating operation when a thermostat is ON/OFF by a method wherein operation of the first opening or closing valve is repeated to perform a transportation of refrigerant and action of the refrigerant when the combustion is started is changed in response to an amount of combustion just before its operation. CONSTITUTION:When the first opening or closing valve 7 is opened, one pressure in a liquid receiver 4 and the other pressure in a gas-liquid separator 2 are communicated to each other through a mean pressure pipe 8, resulting in that these two pressures become equal to each other, liquid refrigerant within the liquid receiver 4 drops into the gas-liquid separator 2 and then the liquid refrigerant is supplied to a refrigerant heater 1. Accordingly, if the first opening or closing valve 7 is a solenoid valve, a transporting power for circulating refrigerant is satisfactory only with a consumption power of the solenoid valve. In the case that the amount of combustion during ON state of the thermostat just before it is a predetermined value or more, the liquid refrigerant is forcedly drawn into the refrigerant heater 1 at the starting time of combustion and in turn when the amount of combustion is the predetermined value or less, the combustion is started only with the opening or closing operation of the first opening or closing valve 7. With such an arrangement, it is possible to prevent abnormal heating operation when the combustion is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer device for utilizing heat for heating or the like by utilizing a pressure increase when heating a refrigerant.

[0002]

2. Description of the Related Art Conventionally, as a heat transfer device for heating by this kind of refrigerant heating, for example, JP-A-57-101263.
There is a structure as shown in FIG.

That is, the compressor 41, the flow path switching valve 42, the outdoor heat exchanger 44 having the outdoor blower 43, and the first solenoid valve 4
5, a capillary tube 46, an indoor heat exchanger 48 having an indoor blower 47, a second electromagnetic valve 49, a check valve 50, and an accumulator 51 are sequentially pipe-connected to form a circulation path, and further a third electromagnetic valve 52 and a refrigerant. Refrigerant is enclosed as a working medium in a circuit in which a series piping circuit in which a refrigerant heater 55 having a pump 53 and a burner 54 is connected in series is connected between a downstream of the capillary tube 46 and an upstream of the second electromagnetic valve 49. There is.

In the heating operation, after the pumping operation in which the compressor 41 is driven to move the refrigerant on the outdoor heat exchanger 44 side to the refrigerant heater 55 side, the refrigerant heater 55 is heated by the burner 54 to form an evaporator. The indoor heat exchanger 48 is used as a condenser, the refrigerant pump 53 is used as a refrigerant carrier, and a heating cycle is configured. Further, the cooling is a compressor-driven conventional cooling cycle.

Further, as another conventional heat transfer device for heating by heating a refrigerant, cooling is performed by a conventional method of driving a compressor, and heating is performed by using this cooling compressor as a refrigerant gas pump (not shown). There is.

[0006]

However, in the above-mentioned conventional structure, the refrigerant pump or the compressor must be driven as the refrigerant circulating transfer means during the heating operation, and a relatively large electric input is used as the heat transfer power. (When the heating capacity is about 4000 kcal / h, 50-
60 W, a compressor consumes about 300 to 400 W), and there is a problem that heating running cost becomes high.

The present invention solves such a conventional problem by heating with a stable refrigerant heating during a thermo ON / OFF operation in which the heat transfer power during heating is extremely small and the room temperature is kept at a set value. The purpose is to provide driving.

[0008]

In order to achieve the above object, the present invention connects a refrigerant heater and a gas-liquid separator, and connects the gas-liquid separator to the inlet side and the outlet side by a first opening / closing valve and a first check valve. A heating circuit in which the gas-liquid separator, an indoor heat exchanger having a room temperature detector, a second check valve, and the liquid receiver are sequentially pipe-connected to a heat transfer unit having a liquid receiver connected via a valve. , A cooling circuit having an outdoor heat exchanger and a compressor additionally connected to the heating circuit at one end via a flow path switching valve and at the other end via a second opening / closing valve, and thermostat due to room temperature falling below a set value In the configuration described above, a control device is provided to change the behavior of the refrigerant at the start of combustion according to the amount of combustion during the immediately preceding thermo-ON.

[0009]

With the above structure, the present invention makes it possible to carry the refrigerant by repeating the opening / closing operation of the first opening / closing valve which requires only a very small electric input, thereby reducing the running cost, and moreover, the behavior of the refrigerant at the start of combustion in the thermo-ON immediately before. By changing according to the amount of combustion during the thermo ON, the start of combustion with respect to the behavior of the liquid refrigerant in the refrigerant heater that fluctuates due to the residual heat of the refrigerant heater when the combustion stops, which changes depending on the amount of combustion Always ensure liquid refrigerant in the refrigerant heater.

By securing this liquid refrigerant, abnormal overheating of the refrigerant heater at the start of combustion can be prevented, and stable heating operation by heating the refrigerant can be realized.

[0011]

Embodiment An embodiment of the present invention will be described below with reference to FIG.

Reference numeral 1 is a refrigerant heater having an overheat detector 1a provided on a wall surface, 2 is a gas-liquid separator, and the refrigerant heater 1 and the gas-liquid separator 2 are an inlet pipe 3 and an outlet pipe 3'in an annular pipe line. It is connected. Reference numeral 4 is a liquid receiver provided above the gas-liquid separator 2, 5 is a first check valve provided in a drop pipe 6 connecting the liquid receiver 4 and the gas-liquid separator 2, and 7 is the liquid receiver 4 and the gas. A first opening / closing valve provided in a pressure equalizing pipe 8 connecting to the liquid separator 2, 9 is a heat having a refrigerant heater 1, a gas-liquid separator 2, a liquid receiver 4, a first check valve 5, and a first opening / closing valve 7. The transfer section 10 is a second check provided in the vicinity of the inlet upstream side of the indoor heat exchanger 12 and the liquid receiver 4 by connecting the gas-liquid separator 2 and the indoor heat exchanger 12 having the indoor blower 11 with the gas refrigerant pipe 13. It is a heating circuit in which the valve 14 and the liquid receiver 4 are connected by a liquid refrigerant pipe 15 to form a heat transfer section 9 and an annular circulation path. Reference numeral 16 is a third check valve provided on the gas-liquid separator 2 side of the gas refrigerant pipe 13, 17 is a burner provided so as to face the refrigerant heater 1, and 18 is a fuel supply device for varying the fuel supply to the burner 17. , 19 is an evaporation temperature detector provided on the refrigerant outlet side of the refrigerant heater 1, and 20 is the indoor heat exchanger 1.
2 is a room temperature detector for detecting the temperature of the inflowing air side provided in FIG.

Reference numeral 21 is a cooling circuit having a compressor 22, an outdoor heat exchanger 23, a first pressure reducing device 24, and a second opening / closing valve 25, one end of which is connected to the gas refrigerant pipe 13 via a flow path switching valve 26. At the same time, the discharge pipe 27 of the compressor 22 is connected via a fourth check valve 28 between the third check valve 16 of the gas refrigerant pipe 13 and the flow path switching valve 26 composed of a four-way valve. The other end of the cooling circuit 21 communicates with the refrigerant heater 1 and the pressure equalizing pipe 8. Reference numeral 29 is a second cooling circuit that connects the inlet pipe 3 and the liquid refrigerant pipe 15 and has a third opening / closing valve 30 and a second pressure reducing device 31. 32 is a liquid side service valve provided in the liquid refrigerant pipe 15, 33 is a gas side service valve provided in the gas refrigerant pipe 13, 34 is a liquid side joint provided on the indoor heat exchanger 12 side of the liquid refrigerant pipe 15, and 35 is A gas-side joint provided on the indoor heat exchanger 12 side of the gas refrigerant pipe 13, the liquid-side and gas-side service valves 32 and 33, and the liquid-side and gas-side joint 34,
Between 35, the length of the connecting refrigerant pipe can be arbitrarily set according to the installation distance between the outdoor side and the indoor side.

Reference numeral 36 is an outdoor blower provided in the outdoor heat exchanger 23, and 37 is an overheat detector 1a, a first opening / closing valve 7, a fuel supply device 18, an evaporation temperature detector 19, a room temperature detector 20,
A room temperature detector 2 that is electrically connected to the compressor 22 and the second on-off valve 25 and that the room temperature is below a set value
This is a control device that changes the behavior of the refrigerant at the start of combustion in the thermo-ON of 0 according to the combustion amount in the immediately preceding thermo-ON.

In the above structure, the heating is performed by the refrigerant heater 1.
The liquid refrigerant heated by the heat of combustion in the burner 17 flows into the gas-liquid separator 2 in a gas-liquid two-phase state, and the liquid refrigerant flows into the refrigerant heater 1 again from below the gas-liquid separator 2. On the other hand, the gas-liquid separated gas refrigerant flows into the indoor heat exchanger 12 through the gas refrigerant pipe 13, and the refrigerant radiated to the indoor side by the operation of the indoor blower 11 is condensed and liquefied to become a supercooled liquid. When the first opening / closing valve 7 of the pressure equalizing pipe 8 communicating with the liquid receiver 4 is closed by the control device 37, the supercooled liquid pushed by the evaporation pressure in the refrigerant heater 1 passes through the second check valve 14. When it slightly flows into the liquid receiver 4, the saturated gas refrigerant in the liquid receiver 4 is cooled and condensed by the supercooled liquid, and a new supercooled liquid refrigerant is received by the rapid depressurizing action at the time of the condensation. It flows all at once until the inside of the liquid container 4 becomes full. Then the first
When the on-off valve 7 is opened by the controller 37, the pressures of the liquid receiver 4 and the gas-liquid separator 2 are communicated with each other by the pressure equalizing pipe 8 and become the same pressure, and the liquid refrigerant in the liquid receiver 4 falls to the gas-liquid separator 2 due to gravity. The liquid refrigerant is supplied to the refrigerant heater 1. If a solenoid valve is used as the first opening / closing valve 7, the power required to convey the refrigerant to circulate is only the power consumption of the solenoid valve, and the rated input is 7 W.
It is possible to circulate the refrigerant with a minute transfer power of substantially 3 to 4 Wh by opening and closing a solenoid valve of a certain degree.

FIG. 2 is a thermo-OFF in which the combustion of the burner 17 is stopped when the room temperature detector 20 detects that the set value has been reached.
When the room temperature detector 20 detects that the temperature falls below the set value and repeats the thermo-ON in which the combustion of the burner 17 is performed, the change state of the refrigerant behavior at the start of combustion due to the thermo-ON depending on the combustion amount during the thermo-ON. Is an example showing.

In FIG. 2, combustion is started by turning on the thermo at time t ₁ , and stopped by turning off the thermo at time t ₂ . During this time t ₁ of time t ₂ is the burner 17 is burned in the combustion amount set in advance below the predetermined value Q _L. Then when starting combustion by thermo ON at time t _3, the refrigerant behavior control is changed according to the combustion amount in the thermo ON immediately before, where during the time t ₂ from time t ₁ is the combustion amount is a predetermined value first control by opening and closing operations of the first on-off valve 7 for less than Q _L is performed.

[0018] burned at time t (not shown) _4, a remote control room set due raised and the value amount combustion elevated above a predetermined value Q _L by the like, and combustion stops in thermo OFF at time t _5.

When the combustion is started by the thermo-ON at the time t ₆ , the time immediately before the thermo-ON is from the time t ₃ to the time t _5.
The combustion amount between is burning at least a predetermined value Q _L, brief opening of the second on-off valve 25 before the start of combustion (about 10 seconds) and short operation of the compressor 22 (about 30 Second control is performed by adding the gas purge activation for (seconds) to the opening / closing operation of the first opening / closing valve. By this second control, the gas refrigerant in the refrigerant heater 1 is caused to flow to the outdoor heat exchanger 23 side, and instead, the liquid refrigerant is drawn into the refrigerant heater 1 and the outdoor heat exchanger 23.
The liquid refrigerant can be secured in the refrigerant heater 1 by the gas purge activation for recovering the refrigerant slightly leaked to the side to the heating circuit, and the stable refrigerant heating operation is started. Although combustion in the refrigerant heating operation by making space windows of the room which has been heated at the time t ₇ to increase combustion quantity such as by RT drops significantly less than the predetermined value Q _L, with re-increase of the room temperature It becomes less than the predetermined value Q _L decreases the combustion quantity at time t _8, is stopped burned in thermo OFF at time t ₉ with increasing ambient temperature. Then time t
When starting combustion by thermo ON at _10, the combustion amount during the time t ₆ is in the immediately preceding thermo ON time t ₉ is burning at least a predetermined value Q _L, the above-described prior to the start of combustion The second control is executed similarly.

As described above, the refrigerant behavior at the start of combustion by thermo-ON is changed by the combustion amount in the immediately preceding thermo-ON, the evaporation pressure of the refrigerant is lowered with the stop of combustion, and the supercooling degree of the liquid refrigerant is reduced. However, the circulation action of the liquid refrigerant due to the opening / closing operation of the first opening / closing valve 7 is weakened and stopped, and the residual heat of the refrigerant heater 1 that increases as the combustion amount increases causes the liquid refrigerant in the refrigerant heater 1 to evaporate. This is because the liquid refrigerant is completely evaporated when the residual heat is large.

With respect to the natural behavior of the refrigerant when the combustion is stopped, paying attention to the residual heat of the refrigerant heater 1 which increases as the combustion amount increases, the combustion amount during the immediately preceding thermo-ON is equal to or more than a predetermined value. At the time of combustion, the liquid refrigerant is forcibly drawn into the refrigerant heater 1 at the start of combustion, and when the combustion amount during the immediately preceding thermo-ON is smaller than a predetermined value, the residual heat is small and the liquid refrigerant in the refrigerant heater 1 can be retained. Combustion starts only by opening / closing the first opening / closing valve 7.

As described above, by changing the behavior of the refrigerant at the start of combustion in the thermo-ON in accordance with the combustion amount in the immediately preceding thermo-ON, the optimum start control can be selected, and the liquid refrigerant in the refrigerant heater can be selected. Since it is possible to ensure combustion and start combustion, it is possible to prevent abnormal overheat from occurring in the refrigerant heater, prevent thermal decomposition of the refrigerant or thermal deterioration of the refrigerant heater, and improve the reliability and durability of the device.

Further, since the operation of the compressor which requires a large electric input can be suppressed to a minimum, the economical efficiency is improved.

Further, an example is shown in which the combustion amount for changing the behavior of the refrigerant is determined not by the combustion amount burned immediately before the thermostat OFF but by the maximum value of the combustion amount during the thermostat thermostat immediately before the predetermined value or more. .. When this heat carrier is put to practical use, it can be used in a wide variety of ways (such as frequent changes in the room temperature by remote control), and the entire thermo-ON immediately before is judged by the combustion amount immediately before thermo-OFF. It is safer to prevent abnormal overheating by making a judgment based on the amount of combustion at.

For cooling, the flow path switching valve 26 is switched in the direction of the broken line in FIG. 1, the second opening / closing valve 25 and the third opening / closing valve 30 are opened, and the compressor 22, the indoor blower 11 and the outdoor blower 36 are opened.
In this way, the conventional compressor-driven cooling is performed.

[0026]

As described above, the heat transfer device of the present invention is a heating circuit in which an indoor heat exchanger having a room temperature detector is connected to a heat transfer part having a refrigerant heater, a liquid receiver, and a first check valve. And an air-conditioning circuit having an outdoor heat exchanger and a compressor, one end of which is additionally connected to the heating circuit via a flow path switching valve and the other end of which is connected via a second opening / closing valve, and a thermostat due to a room temperature falling below a set value. O
Since a control device for changing the behavior of the refrigerant at the start of combustion in N in accordance with the combustion amount during the immediately preceding thermo-ON is provided, abnormal refrigerant overheating at the start of combustion can be prevented, and stable refrigerant heating operation can be performed. This has the effect of improving reliability and durability. Further, since the operation of the compressor which requires a large electric input can be minimized, there is an advantage that the economical efficiency is improved.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a heat transfer device according to an embodiment of the present invention.

FIG. 2 is a refrigerant behavior control operation diagram of the embodiment of the present invention.

FIG. 3 is a system configuration diagram of a conventional heat transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerant heater 2 Gas-liquid separator 4 Liquid receiver 5 1st check valve 7 1st opening / closing valve 9 Heat transfer part 10 Heating circuit 12 Indoor heat exchanger 14 2nd check valve 20 Room temperature detector 21 Cooling circuit 22 Compression Machine 23 outdoor heat exchanger 25 second opening / closing valve 26 flow path switching valve 37 control device

Claims (2)

[Claims] 1. A refrigerant heater is connected to a gas-liquid separator, and the gas-liquid separator is connected to a first opening / closing valve on the inlet side and the outlet side,
The gas-liquid separator, the indoor heat exchanger having the room temperature detector, the second check valve, and the liquid receiver are sequentially pipe-connected to the heat transfer unit having the liquid receiver connected through the first check valve. The heating circuit, the cooling circuit having the outdoor heat exchanger and the compressor additionally connected to the heating circuit at one end via the flow path switching valve and the other end at the second opening / closing valve, and detected by the room temperature detector. A heat transfer device provided with a control device that changes the behavior of the refrigerant at the start of combustion in thermo-ON when the room temperature falls below a set value according to the amount of combustion in the thermo-ON immediately before. 2. The control means for changing the behavior of the refrigerant uses the first control by opening / closing the first opening / closing valve, the opening of the second opening / closing valve, and the gas purge start by the operation of the compressor as the opening / closing operation of the first opening / closing valve. 2. The heat transfer apparatus according to claim 1, further comprising a second control added, wherein the second control is selected only when the combustion amount during the immediately preceding thermo-ON is a predetermined value or more.