JP2796680B2 - heater - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heater, and more particularly to a heater suitable for performing a heating operation by a heat siphon system.

[Conventional technology]

2. Description of the Related Art Conventionally, a heater shown in FIG. 2 has been known as a heater to which a heat siphon system is applied. This device is integrally formed with a compression type heat pump type cooling device, and a heat source device 10 and an indoor unit 12 are connected to a gas refrigerant pipe 14.
And a liquid refrigerant pipe 16.

The heat source device 10 includes an evaporator 18, a heater 20, electromagnetic valves 22, 24, 26, an accumulator 28, a compressor 30, a condenser 32, and a cooling fan 34. The indoor unit 12 includes a heat exchange coil 36 as a heat exchanger. Electromagnetic valves 38 and 40, a capillary tube 42, and a liquid receiver 44 are provided in the middle of the liquid refrigerant pipe 16.

In the device shown in FIG.
6, 38 are closed, the solenoid valves 22, 40 are opened, the heat energy of the heater 20 is received, the refrigerant in the evaporator 18 evaporates, and is supplied to the indoor unit 12 through the gas refrigerant pipe 14. . The gas refrigerant supplied to the indoor unit 12 exchanges heat with the outside air by the heat exchange coil 16 to heat the room. The gas refrigerant used for heat exchange is condensed and liquefied, and is supplied to the evaporator 18 via the liquid receiver 14 and the liquid refrigerant pipe 16.

On the other hand, during cooling, the solenoid valves 22 and 40 are closed, and the solenoid valves 24 and
26 and 38 are opened, the gas refrigerant is compressed by the operation of the compressor 30, the compressed gas refrigerant is condensed in the condenser 32, and the condensed liquid refrigerant is sent to the indoor unit 12 via the liquid refrigerant pipe 16. Be paid. This liquid refrigerant is heat-exchanged with the outside air by the heat exchange coil 36 to cool the room.

[Problems to be solved by the invention]

However, in the case of the conventional device, when switching from the cooling operation to the heating operation and when starting the heating operation,
There is no or very little liquid refrigerant in the evaporator 18, a state in which a large amount of liquid refrigerant remains in the condenser 32, or the saturation pressure temperature of the refrigerant in the indoor unit 12 Becomes almost the same temperature as the ambient temperature around the indoor unit 12, and even if the evaporator 18 is heated by the heater 20, sufficient refrigerant vapor cannot be generated from the evaporator 18, and the refrigerant flows into the gas refrigerant pipe 14 and There is a problem that the air cannot be circulated smoothly in the air refrigerant pipe 16.

An object of the present invention is to provide a heater capable of smoothly circulating a refrigerant when a heating operation is shut down.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a heat exchanger that receives refrigerant vapor and exchanges heat with the outside air, an evaporator that receives thermal energy to evaporate a liquid refrigerant, and a refrigerant vapor generated from the evaporator. A compressor that operates in response to a command to generate a compressed liquid refrigerant in a heater having a gas refrigerant pipe leading to a heat exchanger and a liquid refrigerant pipe leading liquid refrigerant generated from the heat exchanger to an evaporator A compressed refrigerant pipe for guiding the liquid refrigerant generated from the compressor to the liquid refrigerant pipe, an on-off valve for opening and closing the pipe of the compressed refrigerant pipe according to a command, and a temperature difference between the refrigerant on the inlet side and the outlet side of the evaporator. And a temperature sensor that outputs a detection signal when the detected temperature difference reaches a set value. At the start of operation, a valve opening command is given to the on-off valve until a detection signal is output from the temperature sensor. At the same time, an operation command is given to the compressor. That it is obtained by configuring the heating machine provided with a controller.

[Action]

At the start of the heating operation, the compressor operates and the compressed refrigerant pipe is connected to the liquid refrigerant pipe, the compressed liquid refrigerant is sent to the liquid refrigerant pipe, and the pressure of the liquid refrigerant in the liquid refrigerant pipe increases, Condensation of the refrigerant vapor in the heat exchanger is promoted. Therefore, the liquid refrigerant is smoothly circulated in the pipe connecting the evaporator and the heat exchanger. This operation is continued until the temperature difference between the refrigerant on the evaporator inlet side and the refrigerant on the outlet side reaches the set value, so that the amount of refrigerant supplied to the heat exchanger during heating is prevented from becoming insufficient, and the heating capacity is reduced. This can be prevented.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a unit in which a heating unit using a heat siphon system and a cooling unit using a compression heat pump system are integrated. In FIG. 1, a heat source unit 10 is connected to an indoor unit 12 via a gas refrigerant pipe 14 and a liquid refrigerant pipe 16.
0, the capillary tube 42 and the liquid receiver 44 are inserted.

The heat source device 10 includes an evaporator 18, a heater 20, solenoid valves 22, 24, 26, an accumulator 28, a compressor 30, a condenser 32, a cooling fan 34,
The evaporator 18 is connected to the gas refrigerant pipe 14 and the liquid refrigerant pipe 16. In the middle of the gas refrigerant pipe 14,
A compressed refrigerant pipe 52 branched from the pipe 16 is connected in the middle of the liquid refrigerant pipe 16. The electromagnetic valve 22 is inserted in the liquid refrigerant pipe 16, the electromagnetic valve 24 is inserted in the compressed refrigerant pipe 52, and the electromagnetic valve 26 is inserted in the pipe 50. Further, an accumulator 28 and a compressor 30 are provided in the middle of the pipe 50.

The evaporator 18 receives the heat energy from the heater 20, evaporates the liquid refrigerant (fluorocarbon) in the pipe, and sends it to the gas refrigerant pipe 14. This evaporator 18 includes an evaporator
A differential temperature thermo 46 is provided as a temperature sensor for detecting the temperature difference between the liquid refrigerant on the inlet side and the liquid refrigerant on the outlet side of the controller 18, and when the detected temperature difference reaches the set value,
A detection signal is output to 48. The controller 48 gives a valve opening command to the solenoid valve 24 at the start of the heating operation and gives an operation command to the compressor 30, and gives a valve closing command to the solenoid valve 24 when a detection signal is input from the differential temperature thermo 46. At the same time, it is configured to give an operation stop command to the compressor 30.

The indoor unit 12 is installed above the heat source unit 10, has a heat exchange coil 36 as a heat exchanger, receives heat of the refrigerant vapor from the gas refrigerant pipe 14, exchanges heat with the outside air, and heats the room. The liquid refrigerant from the liquid refrigerant pipe 16 to the capillary tube
It is configured to cool the room by receiving heat via the air exchange with the outside air. The heat exchange coil 36 constitutes a heat siphon together with the gas refrigerant pipe 14, the liquid refrigerant pipe 16, the liquid receiver 44 and the evaporator 18. In other words, the head pressure of the heat medium that has radiated and condensed in the heat exchange coil 36 based on the height difference between the indoor unit 12 and the evaporator 2 is the driving force of the heat siphon.

In the above configuration, during cooling, the solenoid valves 22, 40 are closed, the solenoid valves 24, 26 are opened, and the compressor 30 operates. Thereby, a compression heat pump is formed, and the refrigerant vapor is compressed by the operation of the compressor 30 and is sent to the condenser 32. Then, when the compressed and high-temperature refrigerant vapor is supplied to the condenser 32 and cooled, it is condensed and liquefied and then supplied to the capillary tube 42 via the liquid refrigerant pipe 16. The liquid refrigerant expands when passing through the capillary tube 42, and the temperature further decreases. Then, the liquid refrigerant whose temperature has decreased is supplied to the heat exchange coil 36 of the indoor unit 12. Here, when the refrigerant exchanges heat with the outside air by the heat exchange coil 36, the heat of the outside air is taken away and cooling is performed. At this time, the refrigerant evaporates using the heat taken as evaporation heat and becomes refrigerant vapor. This refrigerant vapor is supplied to the compressor 30 via the gas refrigerant pipe 14, is compressed again, and the above cycle is repeated.

Next, at the time of heating, the solenoid valves 22, 40 are opened, and the solenoid valves 24,
26,38 is closed. As a result, a heat siphon is formed, and the liquid refrigerant in the evaporator 18 evaporates due to the heating of the heater 20, and is supplied to the indoor unit 12 via the gas refrigerant pipe 14 as refrigerant vapor. The refrigerant vapor sent to the indoor unit 12 exchanges heat with the outside air by the heat exchange coil 36, and gives heat to the surrounding air to condense and liquefy. This heats the room. The liquefied refrigerant is supplied to the evaporator 18 via the liquid receiver 44 and the liquid refrigerant pipe 16, and the above-described cycle is repeated.

When performing the heating operation, at the time of the rise of the heating operation, only the solenoid valve 24 among the closed solenoid valves 24, 26, and 38 is opened and the compressor 30 is operated. The liquid refrigerant is supplied into the liquid refrigerant pipe 16 via the compressed refrigerant pipe 52. Thereby, the pressure of the liquid refrigerant pipe 16 increases, and the condensation of the gas refrigerant in the indoor unit 12 is promoted.
For this reason, the refrigerant is smoothly supplied to the evaporator 18 and the heat exchange coil 36, and a decrease in the heating capacity due to an insufficient supply of the refrigerant is prevented. At this time, the temperature difference between the refrigerant on the inlet side and the outlet side on the evaporator 18 is detected by the differential temperature thermo 46, and when the detected temperature difference of the differential temperature thermo 46 reaches the set value, a detection signal is output. The command closes the solenoid valve 24 and stops the operation of the compressor 30. That is, in a state where the refrigerant is smoothly circulated in the gas refrigerant pipe 14 and the liquid refrigerant pipe 16, the solenoid valve 24 is closed and
Is stopped.

Further, in the above embodiment, even when switching from the cooling operation to the heating operation, if the same operation as when starting up the heating operation is performed, the refrigerant can be smoothly circulated even when switching from the cooling operation to the heating operation. Can be.

〔The invention's effect〕

As described above, according to the present invention, when the heating operation is started, the compressor is operated to supply the compressed liquid refrigerant to the liquid refrigerant pipe to increase the pressure of the liquid refrigerant pipe, and the evaporator and Since the refrigerant in the refrigerant supply path connecting the heat exchangers is smoothly circulated, it is possible to prevent a decrease in the heating capacity when the heating operation is shut down.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an air conditioner showing one embodiment of the present invention, and FIG. 2 is a configuration diagram of a conventional example. 10: Heat source unit, 12: Indoor unit, 14: Gas refrigerant piping, 16: Liquid refrigerant piping, 18: Evaporator, 20: Heater, 22,24,26,38,40 ... Electromagnetic Valve, 30… Compressor, 32… Condenser, 36 …… Heat exchange coil, 42 …… Capillary tube, 44 …… Receiver, 46 …… Differential temperature thermometer, 48 …… Controller, 52… Compression Refrigerant piping.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F25B 1/00

Claims (1)

(57) [Claims] 1. A heat exchanger for receiving heat and exchanging heat with outside air, an evaporator for evaporating liquid refrigerant by receiving heat energy, and a gas refrigerant for guiding refrigerant vapor generated from the evaporator to the heat exchanger. In a heater having a pipe and a liquid refrigerant pipe that guides a liquid refrigerant generated from the heat exchanger to an evaporator, a compressor that operates in response to a command and generates a compressed liquid refrigerant,
Compressed refrigerant piping that guides the liquid refrigerant generated from the compressor to the liquid refrigerant piping, an on-off valve that opens and closes the piping of the compressed refrigerant piping according to commands, and detects the temperature difference between the inlet and outlet sides of the evaporator A temperature sensor that outputs a detection signal when the detected temperature difference reaches a set value, and at the start of operation, a valve opening command is given to the on-off valve until a detection signal is output from the temperature sensor. A heater provided with a controller for giving an operation command to the compressor.