JPH05215345A - Thermal transfer device - Google Patents

Abstract

PURPOSE:To provide a thermal transfer device for use in utilizing heat in a heating operation through utilization of increased pressure applied when refrigerant is heated in which a thermal transferring power during the heating operation is quite low in its value, an abnormal over-heating at the starting time of combustion is prevented and a stable heating operation is provided. CONSTITUTION:A thermal transfer part 9 including a refrigerant heater 1 having an over-heating sensor 1a, a liquid receiver 4 and the first opening or closing valve 7 is provided with a heating circuit 10 to which an indoor heat exchanger 12 and the second check valve 14 are connected and a cooling circuit 21 having a compressor 22 additionally connected to the heating circuit 10 at its one end through a flow passage changing-over valve 26 and at the other end through the second opening or closing valve 25. At the starting time of combustion, the second opening or closing valve 25 is opened for a short period of time and at the same time when a plurality of times of openings accompanying a repetition of ON/OFF of combustion, a control device 37 is provided to add a pump-down operation through the driving of the compressor to the opening of the second opening or closing valve 25 for a short period of time.

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 one having a configuration as shown in the publication.

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 solenoid valve 49, a check valve 50, and an accumulator 51 are sequentially pipe-connected to form a circulation path, and further a third solenoid valve 52 and a refrigerant pump. 53, a refrigerant heater 55 having a burner 54 is connected in series to connect a series piping circuit between the downstream side of the capillary tube 46 and the upstream side of the second electromagnetic valve 49. ..

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 serves as a condenser, the refrigerant pump 53 serves as a refrigerant carrier, and a heating cycle is configured. Further, the cooling constitutes a conventional cooling cycle driven by a compressor.

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

The present invention solves the above-mentioned conventional problems, and provides a stable refrigerant heating operation in which heat transfer power during heating is extremely small and abnormal overheating at the start of combustion is prevented. To aim.

[0008]

In order to achieve the above object, the present invention connects a refrigerant heater provided with an overheat detector and a gas-liquid separator, and makes a first opening and closing of the gas-liquid separator and the inlet side and the outlet side. A heating circuit in which the gas-liquid separator, the indoor heat exchanger, the second check valve, and the liquid receiver are sequentially pipe-connected to a heat transfer unit having a liquid receiver connected through a valve and a first check 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 the second opening / closing valve is shortened at the start of combustion. A control device is provided for performing the pump down operation by the compressor drive for the short-time opening of the second opening / closing valve when the opening is performed for a plurality of times accompanied by the repetition of the combustion ON / OFF.

[0009]

With the above structure, the present invention makes it possible to reduce the running cost by carrying the refrigerant by repeating the opening / closing operation of the first opening / closing valve which requires only a very small electric input, and further, to shorten the operation time of the second opening / closing valve at the start of combustion. Upon opening, the gas refrigerant in the refrigerant heater is made to flow out to the cooling circuit side due to the pressure difference, and instead, the liquid refrigerant is drawn from the indoor heat exchanger side to the refrigerant heater to secure the liquid refrigerant and realize a stable refrigerant heating operation. When the combustion on / off was repeated and the short-time opening of the second on-off valve was repeated multiple times, and the refrigerant in the heating circuit decreased, short-time opening of the second on-off valve and operation of the compressor were added, and the refrigerant leaked to the cooling circuit. It is possible to realize a stable refrigerant heating operation by guaranteeing the amount of refrigerant in the heating circuit by the pump down operation for collecting the refrigerant to the heating circuit side.

[0010]

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 refrigerant heating 1 and a gas-liquid separator 2 are connected to an annular pipe line by an inlet pipe 3 and an outlet pipe 3 '. Has been done. 4 is a liquid receiver provided above the gas-liquid separator 2,
5 is a drop pipe 6 for connecting the liquid receiver 4 and the gas-liquid separator 2
The first check valve provided in the, 7 is the liquid receiver 4 and the gas-liquid separator 2
A first on-off valve provided on the pressure equalizing pipe 8 for connecting with, a refrigerant heater 1, a gas-liquid separator 2, a liquid receiver 4, a first check valve 5,
The heat transfer section 10 having the first opening / closing valve 7 connects the gas-liquid separator 2 and the indoor heat exchanger 12 having the indoor blower 11 with the gas refrigerant pipe 13 and the inlet upstream side of the indoor heat exchanger 12 and the liquid receiver 4. This is a heating circuit in which a second check valve 14 and a liquid receiver 4 provided in the vicinity are connected by a liquid refrigerant pipe 15 to form a heat transfer unit 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. Reference numeral 19 denotes an evaporation temperature detector provided on the refrigerant outlet side of the refrigerant heater 1, and 20 denotes a room temperature detector provided on the indoor heat exchanger 12 for detecting the temperature of the inflow air side.

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, and one end thereof 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 on-off valve 7, a fuel supply device 18, an evaporation temperature detector 19, a room temperature detector 20,
The second on-off valve 25 is electrically connected to the compressor 22 and the second on-off valve 25, and opens the second on-off valve 25 for a short time at the start of combustion, and at the same time, opens the second on-off valve 25 at a plurality of times accompanying ON / OFF repetition of combustion. This is a control device that adds pump-down operation by driving the compressor 22 to the opening for a short time.

In the above structure, the heating is performed by the refrigerant heater 1.
The liquid refrigerant heated by the combustion heat 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 the gas slightly flows into the liquid receiver 4, the saturated gas refrigerant in the liquid receiver 4 is cooled and condensed by this supercooling liquid, and the new supercooling liquid refrigerant is received by the rapid depressurizing action at the time of this condensation. It flows all at once until the inside of the container 4 becomes full. Next is the first
When the opening / closing valve 7 is opened by the control device 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 shows that the room temperature detector 20 detects that the set value has been reached, and the combustion of the burner 17 is stopped.
And the room temperature detector 20 detects that the temperature has fallen below a set value and repeats the thermo-ON in which the burner 17 is burned, the refrigerant behavior control at the start of combustion is an example.

In FIG. 2, first, the case where the refrigerant heater wall temperature detected by the overheat detector 1a rises in a stable refrigerant heating state as shown by the solid line will be described. At the time t ₁ after the thermostat is turned off, the first opening / closing valve 7 is activated at the start of combustion due to the thermostat on.
In addition to the opening / closing operation of the second opening / closing operation of the second opening / closing valve 25 for a short time (5
About a second). By opening the second opening / closing valve 25 for a short time, the gas refrigerant in the refrigerant heater 1 is slightly discharged to the cooling circuit 21 side by utilizing the pressure difference, and instead, the liquid refrigerant on the indoor heat exchanger 12 side is received. The liquid refrigerant is drawn into the refrigerant heater 1 through the heater 4 to secure the liquid refrigerant in the refrigerant heater 1, and a stable refrigerant heating operation can be performed. At time t ₂ , the combustion is stopped by turning off the thermostat. The following Similarly thermo ON at time t _3, thermo OFF at time t _4, the thermo ON at time t _5, the thermo-O at time t ₆
FF is repeated.

Next, when the thermostat is turned on at time t ₇ , the second opening / closing valve 25 is opened for a short time a plurality of times as the combustion is turned on / off repeatedly. Therefore, the second opening / closing is performed before the start of combustion. In addition to opening the valve 25 for a short time (about 10 seconds), the compressor 2
The pump down operation for collecting the refrigerant leaked to the cooling circuit 21 side to the heating circuit 10 side by the short-time operation 2 (about 1 minute) is performed. Due to the short-time opening and pump down operation of the second opening / closing valve 25, liquid refrigerant is secured in the refrigerant heater 1 and the total amount of refrigerant in the heating circuit 10 is restored to the original state, so that abnormal overheating occurs. And stable refrigerant heating operation can be realized. When the pump down operation is performed after the opening is performed a plurality of times, the count of the number of times the second opening / closing valve 25 is opened is returned to zero, and the operation from the time t ₁ described above is repeated.

As described above, at the start of combustion, the second opening / closing valve 25
In order to forcibly draw and secure the liquid refrigerant into the refrigerant heater 1 by opening it for a short time, it is necessary to ensure that the liquid refrigerant is installed outside the outdoor side when the indoor side of the device is installed lower than the outdoor side. This is particularly effective under the condition that it is difficult to return to the liquid receiver 4 and the refrigerant heater 1, and the installability of the device is improved and the workability is improved.

Furthermore, since the compressor 22 having a large electric input can be operated only a few times, power consumption is saved and it is economical. By reducing the number of times the compressor 22 is started and stopped, durability and reliability are improved.

Next, a description will be given of a case where the refrigerant heater wall temperature detected by the overheat detector 1a rapidly increases at the start of combustion as shown by the broken line in FIG. At the time t ₁ , when the combustion is started by thermo-ON, the refrigerant heater wall temperature rises sharply due to the lack of liquid refrigerant in the refrigerant heater 1, and the control device 37 makes a sharp rise in this temperature from the detection temperature of the overheat detector 1a. After reading, the second opening / closing valve 25 is opened for a short time, and the liquid refrigerant is forcibly supplied into the refrigerant heater 1 to be cooled to suppress a sharp rise in the temperature of the refrigerant heater wall, thereby performing a normal and stable refrigerant heating operation. When the short-time opening of the second on-off valve 25 due to this rapid temperature rise is repeated a plurality of times, the operation including the pump down operation described above at time t ₇ is executed.

As described above, if the second on-off valve 25 is opened for a short time when the temperature detected by the overheat detector 1a rises abruptly, the difference in installation height between indoors and outdoors and the connection refrigerant piping are practical. In many cases, due to lack of liquid refrigerant in the refrigerant heater 1 at the start of combustion such as a long time, a rapid rise in the heater wall temperature does not occur, so the number of times of starting and stopping the compressor 22 can be further reduced, and the compressor 22 The improved durability can further improve the durability of the device.

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

[0023]

As described above, the heat transfer device of the present invention is a heating circuit in which an indoor heat exchanger is connected to a heat transfer part having a refrigerant heater provided with an overheat detector, a liquid receiver, and a first opening / closing valve. And a cooling circuit having 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 at the start of combustion the second opening / closing valve is opened for a short time and combustion ON / O
A control device is provided to add a pump-down operation by driving the compressor to the opening of the second on-off valve for a short time when the FF is repeatedly opened, so that abnormal overheating can be prevented and the number of times the compressor is started and stopped can be reduced. The reduction has the effect of improving the reliability, durability, and economic efficiency of the equipment. Further, there is also an advantage that it is possible to cope with a reverse installation condition in which the indoor side is located at a position lower than the outdoor side, which is a condition in which the liquid refrigerant does not easily return to the outdoor side, and the installability and workability of the device are 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]

 1 Refrigerant Heater 1a Overheat Detector 2 Gas-Liquid Separator 4 Liquid Receiver 5 First Check Valve 7 First Open / Close Valve 9 Heat Transfer Section 10 Heating Circuit 12 Indoor Heat Exchanger 14 Second Check Valve 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 receiver in which a refrigerant heater provided with an overheat detector is connected to a gas-liquid separator, and the gas-liquid separator is connected to the inlet side and the outlet side via a first on-off valve and a first check valve, respectively. A heating circuit in which the gas-liquid separator, the indoor heat exchanger, the second check valve, and the liquid receiver are sequentially pipe-connected to a heat transfer unit having a liquid container, one end of which is connected via a flow path switching valve, and the other end of which is connected to the first (2) A cooling circuit having an outdoor heat exchanger and a compressor additionally connected to the heating circuit via two on-off valves, and a plurality of the second on-off valves opened for a short period at the start of combustion and accompanied by repeated combustion ON / OFF A heat transfer device provided with a control device for performing a pump-down operation by driving the compressor when the second opening / closing valve is opened for a short time during a single opening. 2. The heat transfer apparatus according to claim 1, wherein the second opening / closing valve is opened for a short time when the temperature detected by the overheat detector rises sharply.