JPH05157258A - Heat transferring apparatus - Google Patents

Abstract

PURPOSE:To improve safety by sequentially setting a combustion amount variable control range temperature based on sensing information of an evaporating temperature sensor, a combustion stop temperature and a combustion forcible stop temperature by a pressure sensor to higher values. CONSTITUTION:A combustion amount variable control range temperature based on sensing information of an evaporating temperature sensor 14, a combustion stop temperature and a combustion forcible stop temperature by a pressure detector 22 are sequentially set to higher values. That is, as an evaporating temperature rises, a combustion is smoothly reduced at the combustion amount decreasing control range temperature, and the combustion is stopped by a minimum combustion amount at the higherly set combustion stop temperature. Further, even if the sensor 14 or an apparatus operating state becomes abnormal, the combustion can be effectively stopped by the sensor 22 set to a pressure corresponding to the higherly set combustion stop temperature, and hence an abnormal rise of the evaporating pressure can be prevented. Thus, safety is improved.

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 A conventional heat transfer device is disclosed in, for example, Japanese Patent Laid-Open No.
As shown in Japanese Patent Publication No. 51631, the structure is as shown in FIG.

That is, the gas-liquid separator 1 is arranged above the refrigerant heater 2 and is 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 line. ing. Further, the liquid receiver 5 is arranged 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 provided with a pressure equalizing pipe 9 having an opening / closing valve 8 by an outlet pipe. It is connected to the gas-liquid separator 1 via 4. The gas-liquid separator 1 and the radiator 10 arranged on the indoor side as the use side are connected by a gas refrigerant forward pipe 11, and the radiator 10 and the liquid receiver 5 are liquid refrigerant return pipes having a second check valve 12. It is connected at 13. 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 sequentially connected by piping. Reference numeral 14 is an evaporation temperature detector provided in the outlet pipe 4 of the refrigerant heater 2, and 15 is a control device for controlling the opening / closing time of the on-off valve 8 according to the temperature detected by the evaporation temperature detector 14. Reference numeral 16 is a burner provided in the refrigerant heater 2, and the burner 16 heats the refrigerant. 17 is a radiator 1
It is a blower installed in 0.

The operation of the above structure will be described below. In the refrigerant heater 2, the refrigerant heated by the heat of combustion of the burner 16 passes through the outlet pipe 4 in the two-phase state of gas and liquid and flows into the gas-liquid separator 1, and the liquid refrigerant is again heated from the inlet pipe 3 by the refrigerant heating. Flows into the vessel 2. On the other hand, gas-liquid separator 1
The gas refrigerant of the two-phase state refrigerant that has flowed into the heat exchanger 10 enters the radiator 10 through the gas refrigerant forward pipe 11 and exchanges heat with the indoor air sent by the blower 17, condenses heat and condenses into supercooled liquid.

When the opening / closing valve 8 is closed, the supercooled liquid refrigerant condensed and liquefied in the radiator 10 is returned to the liquid refrigerant return pipe 13
Through the second check valve 12 to flow into the liquid receiver 5 by condensing the gas refrigerant. At this time, the pressure inside the liquid receiver 5 is lower than the pressure inside the gas-liquid separator 1, so the first check valve 6 is in a closed state. In this state,
When the open / close valve 8 is opened, the liquid receiver 5 and the gas-liquid separator 1 communicate with each other through the pressure equalizing pipe 9 to be in a pressure equalizing state, and the liquid refrigerant in the liquid receiver 5 passes through the first check valve 6 by gravity. It flows into the gas-liquid separator 1.

Next, when the opening / closing valve 8 is closed again, the first check valve 6 is closed, and the condensed subcooling liquid refrigerant of the radiator 10 is rapidly decompressed into the liquid receiver 5. The cycle in which the liquid receiver 5 is sucked by and the liquid receiver 5 is filled with the liquid refrigerant is repeated. As described above, the natural circulation cycle between the gas-liquid separator 1 and the refrigerant heater 2 is based on the evaporated refrigerant pressure, and the supply of the liquid refrigerant from the liquid receiver 5 to the gas-liquid separator 1 and the refrigerant heater 2 is performed by the open / close valve 8 It is an intermittent operation cycle according to the open / close cycle.

[0007]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
To open and close the on-off valve 8 for heat transfer by heating the refrigerant.
Evaporation temperature of refrigerant and bar whose cycle is detected by the temperature detector 14
It is properly controlled according to the combustion amount in the nozzle 16. Figure 5
The closing time T of the on-off valve 8 during this steady combustion_OFFAnd opening time T_ON
Opening and closing cycle T_S(T_S= T_OFF+ T_ON) Drive letter
Status, time t _OSwitch from open to closed at
With decompression start delay time T_lAfter receiving liquid 5
The inside is cooled and condensed by the supercooled liquid refrigerant, and the depressurization time T_r
Then, the inflow of liquid refrigerant due to decompression is completed (T_OFF= T_l+
T_r). The liquid refrigerant that has finished flowing into the liquid receiver 5 is next opened / closed valve 8
Open time T_ONIs dropped to the side of the refrigerant heater 2 and opened.
The heat transfer is continued by repeating the closing.

As described above, there is no problem in stably continuing heat transfer during steady combustion.

However, in the case where this heat transfer is used for heating, etc., the air volume is increased due to the room temperature increase on the user side accompanying the heat transfer operation, abnormal stop of the fan of the radiator 10 or clogging of the ventilation passage of the radiator 10. Due to such a decrease, the evaporation pressure of the refrigerant in the heat transfer device exceeds a safety allowable value, and there is a problem in ensuring the safety of the device.

The present invention is intended to solve the above problems, and an object of the present invention is to provide a stable heating operation in which the refrigerant heating heat transfer is controlled to be equal to or lower than the allowable pressure of the equipment in any case, and safety is ensured.

[0011]

In order to achieve the above object, the present invention connects a refrigerant heater having a burner and a gas-liquid separator, and the gas-liquid separator is connected to an inlet / outlet side opening / closing valve and a first reverse valve. A heat transfer unit having a liquid receiver connected to each other via a stop valve, a circulation path in which a radiator and the heat transfer unit are connected in an annular pipe, a fuel supply device provided in the burner, and a refrigerant heater Evaporation temperature detector and pressure detector provided on the outlet side, combustion amount reduction control region temperature and combustion stop temperature based on the detection information of the evaporation temperature detector and combustion forced stop temperature by the pressure detector are sequentially increased. The combustion control device that has been set is provided.

[0012]

According to the present invention, due to the above-mentioned structure, the combustion amount is reduced as the evaporation temperature rises, and the combustion is stopped when the evaporation temperature rises. In this case, the combustion is forcibly stopped when the pressure detector set to a pressure value smaller than the allowable pressure at which the combustion forced stop temperature, which is higher than the combustion stop temperature, becomes the saturation temperature.

[0013]

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

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

Reference numeral 18 connects the refrigerant heater 2 and the gas-liquid separator 1 provided opposite to the burner 16 to the annular pipe line, and the liquid receiver 5 provided above the gas-liquid separator 1 is connected to the first check valve. The heat transfer section is connected to the annular pipe line by a drop pipe 7 having 6 and a pressure equalizing pipe 9 having an on-off valve 8. Reference numeral 19 denotes a gas-liquid separator 1, a radiator 10 having a blower 17, a second check valve 1
2, an annular circulation path in which the liquid receivers 5 are sequentially connected by piping.
Reference numeral 20 denotes a room temperature detector provided in the radiator 10 and the radiator 1
The temperature of the inflowing air with respect to 0 is detected. Reference numeral 21 is a fuel supply device that changes the amount of fuel supplied to the burner 16.

Reference numeral 22 is a pressure detector provided on the outlet side of the refrigerant heater 2, and 23 is an opening / closing valve 8, an evaporation temperature detector 14,
It is electrically connected to the blower 17, the room temperature detector 20, the fuel supply device 21, and the pressure detector 22 and detects the combustion amount reduction control region temperature, the combustion stop temperature, and the pressure based on the detection information of the evaporation temperature detector 14. This is a combustion control device in which the compulsory forced stop temperature by the device 22 is sequentially increased.

In the above structure, the heating operation of heat transfer by heating the refrigerant is performed by the opening / closing operation of the on-off valve 8, the combustion in the burner 16, and the operation of the blower 17, but the blower 17 is caused by the clogging of the ventilation passage of the radiator 10. The combustion control operation when the evaporation temperature of the refrigerant heater 2 rises, for example, when the amount of the air is significantly reduced will be described with reference to FIG.

In FIG. 2, combustion is started at time t _s , heating operation is performed at the maximum combustion amount Q _max. , And the room temperature on the user side is raised. Combustion amount becomes combustion amount reduction control area in the combustion amount reduction control region temperature lower limit value T ₁ and since time t ₁ becomes high evaporation temperature with room rise decreases from Q _max.. Even if the combustion amount decreases, the evaporation temperature further rises and the combustion amount decreases to the minimum combustion amount Q _{min. At} time t ₂ when the combustion amount reduction region temperature upper limit value T ₂ is reached. Time t ₃ when the evaporation temperature further rises and reaches the combustion stop temperature T ₃ even when the burner 16 is set to the minimum combustion amount Q _min.
At this point, the fuel supply to the burner 16 is stopped and combustion is stopped, and the evaporation temperature of the heat transfer device is lowered. T ₄ is a pressure detector 22
Is a compulsory forced stop temperature that is a saturation temperature corresponding to the pressure set by, and this temperature T ₄ is higher than the combustion stop temperature T ₃ and smaller than the saturation temperature at the allowable pressure which is the upper limit pressure of the heat transfer device. It is set.

FIG. 3 shows a change characteristic of the combustion amount with respect to the evaporation temperature. When the evaporation temperature rises, the maximum combustion amount Q is set at the combustion amount reduction control region temperature lower limit value T ₁ as shown by a solid arrow in the figure.
_The minimum combustion amount Q _min. is maintained until the combustion amount reduction control region temperature upper limit value T ₂ reaches the minimum combustion amount Q _min. and the combustion stop temperature T ₃ is reached and combustion is stopped. The broken line arrow in the figure shows the combustion amount characteristic when the evaporation temperature decreases, and a little hysteresis is provided to stabilize the control operation.

Although the combustion amount control based on the detection information of the evaporation temperature detector 14 has been described above, the evaporation pressure in the refrigerant heater 2 is greatly increased due to the stop of the blower 17 and the detection response delay of the evaporation temperature detector 14 is delayed. When the temperature is large or when the evaporation temperature detector 14 is defective, the pressure detector 22 is operated at a saturation pressure corresponding to the compulsory forced stop temperature T ₄ in the heat transfer operation.
Operates to forcibly stop the burner 16 regardless of the amount of combustion, and prevents the evaporation pressure of the heat transfer device from rising abnormally.

As described above, the combustion amount is smoothly decreased at the combustion amount reduction control region temperature (T _{1 to} T ₂ ) as the evaporation temperature rises, and the minimum combustion amount Q _{min is} set at the higher combustion stop temperature T _3. Combustion is stopped at _. Therefore, abnormal increase of evaporation temperature (evaporation pressure) during normal operation can be prevented with good controllability.
Furthermore, even if an abnormality occurs in the evaporation temperature detector 14 or the operating condition of the equipment, the pressure detector 22 set to a pressure corresponding to the higher compulsory combustion stop temperature T ₄ can surely stop the combustion. The abnormal rise of pressure can be prevented, and the reliability and safety of the equipment are improved. Further, since the detection level of the pressure detector 22 is set higher than the detection level of the evaporation temperature detector 14, the pressure detector 2 is not operated in normal operation.
The controllability is improved without the intervention of 2.

[0022]

As described above, in the heat transfer device of the present invention, the refrigerant heater having the burner is connected to the gas-liquid separator, and the gas-liquid separator is connected to the inlet side and the outlet side of the open / close valve, the first
A heat transfer unit having a liquid receiver connected to each other via a check valve, a circulation path in which a radiator and the heat transfer unit are connected to each other in an annular pipe, a fuel supply device provided in the burner, and the refrigerant heater. Evaporation temperature detector and pressure detector provided at the outlet side of the, the combustion amount variable control region temperature and combustion stop temperature based on the detection information of the evaporation temperature detector and the combustion forced stop temperature by the pressure detector are sequentially Since the combustion control device is set to a high value, the evaporation pressure can be prevented from abnormally increasing, and the heat transfer device can be improved in reliability and safety. Further, since the control temperature level of the pressure detector is set higher than the control temperature level of the evaporation temperature detector, there is an advantage that the controllability 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 control operation diagram of the embodiment of the present invention.

FIG. 3 is a combustion amount change characteristic diagram of the embodiment of the present invention.

FIG. 4 is a system configuration diagram of a conventional heat transfer device.

FIG. 5 is an opening / closing valve operation diagram of a conventional heat transfer device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas-liquid separator 2 Refrigerant heater 5 Liquid receiver 6 First check valve 8 Open / close valve 10 Radiator 14 Evaporation temperature detector 16 Burner 18 Heat transfer part 19 Circulation path 21 Fuel supply device 22 Pressure detector 23 Combustion control device

Claims (1)

[Claims] 1. A heat having a liquid receiver in which a refrigerant heater having a burner is connected to a gas-liquid separator, and the gas-liquid separator is connected to an inlet side and an outlet side through an opening / closing valve and a first check valve, respectively. A transfer unit, a circulation path in which the radiator and the heat transfer unit are connected to each other in an annular pipe, and a fuel supply device provided in the burner,
Evaporation temperature detector and pressure detector provided on the outlet side of the refrigerant heater, combustion amount reduction control region temperature and combustion stop temperature based on the detection information of the evaporation temperature detector, and combustion compulsion by the pressure detector A heat transfer device provided with a combustion control device in which the stop temperature is sequentially increased.