JP2806110B2 - Heat transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art A conventional heat transfer device is disclosed in, for example,
As shown in Japanese Patent No. 51631, the configuration is as shown in FIG.

[0003] That is, the gas-liquid separator 1 is disposed above the refrigerant heater 2 and connected by an inlet pipe 3 of the refrigerant heater 2 and an outlet pipe 4 of the refrigerant heater 2 and connected by an annular pipe. ing. The liquid receiver 5 is disposed above the gas-liquid separator 1, is connected to the gas-liquid separator 1 by a drop pipe 7 having a first check valve 6, and is further connected to an outlet pipe by a pressure equalizing pipe 9 having an on-off valve 8. 4 is connected to the gas-liquid separator 1. The gas-liquid separator 1 and a radiator 10 arranged on the indoor side as a utilization side are connected by a gas refrigerant outflow pipe 11, and the radiator 10 and the liquid receiver 5 are connected to a liquid refrigerant return pipe having a second check valve 12. 13 are connected. As described above, the gas-liquid separator 1, the radiator 10, the second check valve 12, the liquid receiver 5, and the first check valve 6 form an annular circulation path that is sequentially connected to the pipe. Reference numeral 14 denotes a temperature detector provided in the outlet pipe 4 of the refrigerant heater 2, and reference numeral 15 denotes a control device that controls the opening / closing time of the on-off valve 8 based on the temperature detected by the temperature detector 14. Reference numeral 16 denotes a burner provided in the refrigerant heater 2, and the refrigerant is heated by the burner 16. 17 is a blower provided in the radiator 10.

The operation of the above configuration will be described below. In the refrigerant heater 2, the refrigerant heated by the combustion heat of the burner 16 passes through the outlet pipe 4 in the two-phase state of gas and liquid, flows into the gas-liquid separator 1, and the liquid refrigerant heats again from the inlet pipe 3. Into the vessel 2. On the other hand, the gas-liquid separator 1
Of the two-phase refrigerant flowing into the gas refrigerant, the gas refrigerant enters the radiator 10 through the gas refrigerant outflow pipe 11, exchanges heat with the room air sent by the blower 17, radiates and condenses, and turns into supercooled liquid.

When the on-off valve 8 is closed, the supercooled liquid refrigerant condensed and liquefied by the radiator 10 is supplied to the liquid refrigerant return pipe 13.
Then, the gas refrigerant flows into the liquid receiver 5 through the second check valve 12 by condensing the gas refrigerant. At this time, since the pressure in the liquid receiver 5 is lower than the pressure in the gas-liquid separator 1, the first check valve 6 is in a closed state. In this state,
When the on-off valve 8 is opened, the liquid receiver 5 and the gas-liquid separator 1 communicate with each other by the pressure equalizing pipe 9 to be in a pressure equalized state, and the liquid refrigerant in the liquid receiver 5 passes through the first check valve 6 due to gravity. The gas flows into the gas-liquid separator 1.

Next, when the on-off valve 8 is closed again, the first check valve 6 is closed, and the condensed supercooled liquid refrigerant of the radiator 10 flows into the receiver 5 and the pressure in the receiver is rapidly reduced. , And the cycle in which the receiver 5 is filled with the liquid refrigerant is repeated. As described above, a natural circulation cycle is performed between the gas-liquid separator 1 and the refrigerant heater 2 by the evaporated refrigerant pressure, and the supply of the liquid refrigerant from the receiver 5 to the gas-liquid separator 1 and the refrigerant heater 2 is performed by the on-off valve 8. Is an intermittent operation cycle based on the opening / closing cycle.

[0007]

In the above-mentioned conventional construction, in order to carry out heat transfer by heating the refrigerant, the opening / closing cycle of the on-off valve 8 depends on the evaporation temperature of the refrigerant detected by the temperature detector 14 and the amount of combustion in the burner 16. Is properly controlled. When this heat transfer is used for heating, there is no problem in controlling the on-off valve 8 when the room temperature on the user side (indoor side) is equal to or lower than the set value and heating by combustion is continuous.

However, when the combustion is stopped (hereinafter, referred to as "thermo OFF") due to a rise in the room temperature on the utilization side and the temperature reaches a set value, the refrigerant pressure in the heat transfer system drops sharply, so that the liquid refrigerant flows into the receiver. The inflow becomes uncertain, causing abnormal overheating (post-boiling due to residual heat) in the refrigerant heater 2 or abnormalities in the refrigerant heater at the start of combustion (hereinafter referred to as thermo-ON) due to the room temperature falling below the set value. Overheating occurred, and there were problems in the reliability and durability of the heat transfer device, such as thermal decomposition of the refrigerant and heat resistance of the refrigerant heater.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to improve the circulation of refrigerant during transient changes in refrigerant heating conditions, thereby improving the reliability and durability of the heat transfer device.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a liquid receiver having a refrigerant heater having a burner and a gas-liquid separator connected to an annular conduit, and provided above the gas-liquid separator. A heat transfer unit connected to the annular conduit with a dropping pipe having a first check valve and a pressure equalizing pipe having an on-off valve, the gas-liquid separator, a radiator, a second check valve, and the liquid receiver And a room temperature detector provided in the radiator, and only when the open / close valve is opened, the room temperature detector receives a thermo-OFF signal that has reached a predetermined value and stops burning at the burner. And a control device for causing the control device to operate.

[0011]

According to the present invention, since the stop of the combustion by the thermo-OFF is performed until the liquid refrigerant has flowed into the receiver, the liquid refrigerant corresponding to at least one cup of the receiver remains in the heating section. It can be secured for heat treatment and not only prevents abnormal overheating due to after-boiling, but also allows the liquid refrigerant to flow into the receiver by heating the refrigerant with residual heat, so that the liquid refrigerant is heated when the next thermo-ON restarts combustion. Can be supplied to the vessel to prevent the occurrence of abnormal overheating.

[0012]

FIG. 1 shows an embodiment of the present invention.

In FIG. 1, the same reference numerals as those in FIG. 3 denote the same members, and have the same functions.
The different points will be mainly described.

A refrigerant heater 2 and a gas-liquid separator 1 provided opposite the burner 16 are connected to an annular conduit, and a liquid receiver 5 provided above the gas-liquid separator 1 is connected to a first check valve. 6 is a heat transfer section connected to the annular pipe by a drop pipe 7 having an opening 6 and an equalizing pipe 9 having an on-off valve 8. Reference numeral 19 denotes an annular circulation path in which the gas-liquid separator 1, the radiator 10, the second check valve 12, and the liquid receiver 5 are sequentially connected by piping. 20 is a radiator 10
, Which detects the temperature of the air flowing into the radiator 10. Reference numeral 21 denotes a combustion amount varying device that varies the combustion amount of the burner 16.

Numeral 22 denotes a thermoelectric device which is electrically connected to the on-off valve 8, the temperature detector 14, the room temperature detector 20, and the variable combustion amount device 21 and which reaches the predetermined value only when the on-off valve 8 is opened. This is a control device that receives the OFF signal and stops the combustion in the burner 16.

In the above configuration, the heating operation of heat transfer by the heating of the refrigerant is performed by the opening / closing operation of the on-off valve 8, the combustion of the burner 16, and the operation of the blower 17. The operation at the time of thermo-OFF will be described with reference to FIG. When the room temperature on the utilization side rises due to the heat transfer operation by the above-described refrigerant heating and the room temperature detector 20 detects that the room temperature detector 20 has reached a predetermined value, the controller 22 determines that the signal is a thermo OFF signal, and If the opening / closing operation state is open, the supply of fuel to the variable combustion amount device 21 is stopped, and the combustion of the burner 16 is stopped. If the on-off valve 8 is in the closed state when it is determined that the signal is the thermo-OFF signal, the combustion stop operation is not performed and the combustion stop is waited until the next opening.

Next, when the heating operation is stopped by stopping the combustion, the room temperature is lowered, and when the room temperature detector 20 detects that the room temperature falls below a predetermined value, the control device 22 determines that the signal is a thermo-ON signal, and the combustion amount is varied. The fuel supply to the device 21 is restarted, and the heat transfer operation is performed by restarting the combustion of the burner 16.
By repeating the above-mentioned thermo-ON and thermo-OFF, the room temperature on the user side is kept constant, and comfortable heating is performed.

The operation of opening and closing the on-off valve 8 and the operation of the blower 17 are continued even when the combustion is stopped due to the thermo-OFF, and the heat recovery operation for sending the residual heat of the refrigerant heater 2 to the utilization side even when the combustion is stopped. To save energy waste.

As described above, by stopping the combustion in the burner 16 by receiving the thermo-OFF signal when the room temperature detector 20 reaches the predetermined value only when the on-off valve 8 is opened, the liquid refrigerant enters the receiver 5. The combustion is stopped after the inflow of the gas, and the opening of the next opening / closing valve 8 makes it possible to supply a new liquid refrigerant to the residual heat after the combustion is stopped. The liquid refrigerant can be caused to flow into the receiver 5 even when the next on-off valve 8 is closed by the refrigerant evaporation pressure due to heat, and the refrigerant is opened and closed by the on-off valve 8 and the operation of the blower 17 while residual heat is present. Let it circulate. By circulating the refrigerant even during the stop of the combustion, the liquid refrigerant can be sufficiently supplied to the refrigerant heater even when the combustion is restarted at the time of the next thermo-ON, so that the occurrence of abnormal overheating can be prevented even at the time of reheating.

As described above, not only the reliability and durability of the system are improved by preventing abnormal overheating when the combustion is stopped and when the combustion is restarted, but also the waste of energy due to the residual heat recovery operation is eliminated and the economic efficiency is improved. .

[0021]

As described above, the heat transfer apparatus according to the present invention is provided with the control device for stopping the combustion in the burner by receiving the thermo-OFF signal when the room temperature detector reaches a predetermined value only when the on-off valve is opened. Therefore, it is possible to prevent occurrence of abnormal overheating in the refrigerant heater when the combustion is stopped by the thermo-OFF and when the combustion is restarted by the thermo-ON, and the reliability and durability of the heat transfer device can be improved. Further, there is an advantage that the residual heat recovery operation can be performed when the combustion is stopped, and the economic efficiency is improved.

[Brief description of the 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 control flowchart of an 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 Gas-liquid separator 2 Refrigerant heater 5 Liquid receiver 6 1st check valve 7 Drop pipe 8 On-off valve 9 Equalization pipe 10 Radiator 12 Second check valve 16 Burner 18 Heat transfer part 19 Circulation path 20 Room temperature detector 22 Control device

Claims (1)

(57) [Claims] A refrigerant heater having a burner and a gas-liquid separator are connected to an annular conduit, and a receiver provided above the gas-liquid separator is provided with a dropping pipe having a first check valve and an on-off valve. A heat transfer unit connected to the annular conduit with an equalizing pipe having
An annular circulation path in which the gas-liquid separator, the radiator, the second check valve, and the receiver are sequentially connected to a pipe, a room temperature detector provided in the radiator, and the room temperature detection only when the on-off valve is opened. A heat transfer device provided with a control device for receiving a thermo-OFF signal when the temperature of the burner reaches a predetermined value and stopping the combustion in the burner.