JPH0587355A - Heat carrier - Google Patents

Abstract

(57) [Abstract] [Purpose] Utilizing the rise in pressure when heating the refrigerant,
It relates to a device that uses heat for heating, stably supplies the required liquid refrigerant to the refrigerant heater, prevents abnormal overheating of the refrigerant in the refrigerant heater, and ensures device reliability, low noise, and stable heating. Secure. [Structure] A refrigerant heater 2 and a gas-liquid separator 1 are connected by annular pipe lines 3 and 4, and a liquid receiver 5 provided above the gas-liquid separator is connected to a drop pipe 7 having a first check valve 6. And a pressure equalizing pipe 9 having an opening / closing valve 8 are connected to the annular pipe line, and a gas-liquid separator, a radiator 10, a second check valve 12,
A configuration in which a control device 20 is provided which sequentially connects the liquid receivers 5 to form an annular heat transfer passage, detects the liquid receiver 5 being filled with the liquid refrigerant, and opens the on-off valve. To do.

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 by utilizing a pressure rise 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 the inlet pipe 3 of the refrigerant heater 2 and the outlet pipe 4 of the refrigerant heater 2 to form an annular pipe line. ing. Further, the liquid receiver 5 is arranged above the gas-liquid separator 1, and the liquid receiver 5 is connected to the gas-liquid separator 1 by a drop pipe 7 having a first check valve 6, and further, the liquid receiver 5 Is connected to the outlet pipe 4 of the refrigerant heater 2 by a pressure equalizing pipe 9 having an opening / closing valve 8. The gas-liquid separator 1 and the radiator 10 are connected by a gas refrigerant outflow pipe 11, and the radiator 1
0 and the liquid receiver 5 are connected by a liquid refrigerant return pipe 13 having a second check valve 12. 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 heat transfer passage which is sequentially connected by piping. Reference numeral 14 is a temperature detector provided in the outlet pipe 4 of the refrigerant heater 2, and 15 is a control device for controlling the closing time of the on-off valve 8 according to the temperature detected by the temperature detector 14. 16
Is a burner provided in the refrigerant heater 2, and the burner 16 heats the refrigerant. Reference numeral 17 is a combustion amount varying device for varying the combustion amount of the burner 16. A blower 18 is provided in the radiator 10.

The operation of the above arrangement 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 a two-phase state of gas and liquid,
The liquid refrigerant flows into the gas-liquid separator 1, and the liquid refrigerant flows into the refrigerant heater 2 again from the inlet pipe 3. On the other hand, of the two-phase refrigerant that has flowed into the gas-liquid separator 1, the gas refrigerant enters the radiator 10 through the gas refrigerant outflow pipe 11 and exchanges heat with the indoor air sent by the blower 18 to be radiatively condensed and liquefied.

Here, when the on-off valve 8 is closed as shown in FIG. 4, the refrigerant condensed and liquefied in the radiator 10 is passed from the liquid refrigerant return pipe 13 through the second check valve 12 to the liquid receiver 5. Flows in. At this time, the pressure in the liquid receiver 5 is the same as that of the gas-liquid separator 1.
Since the pressure is lower than the internal pressure, the first check valve 6 is closed. If the on-off valve 8 is opened in this state,
The liquid receiver 5 and the gas-liquid separator 1 communicate with each other through a pressure equalizing tube 9 to be in a pressure equalizing state, and the liquid refrigerant in the liquid receiver 5 flows into the gas-liquid separator 1 by gravity through the first check valve 6. ..

Next, when the on-off valve 8 is closed again, the first check valve 6 is closed, the condensed liquid refrigerant of the radiator 10 is pumped into the liquid receiver 5, and the liquid receiver 5 is liquefied. Repeat the cycle filled with refrigerant. 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]

However, in the above-mentioned conventional configuration, heat is radiated when the gas refrigerant outflow pipe 11 and the liquid refrigerant return pipe 13 are long, or when the refrigerant in the cycle is reduced due to leakage to the outside. As shown by the dotted line in FIG. 4, the time when the refrigerant condensed and liquefied in the container 10 is filled in the receiver 5 (the time to reach the full liquid amount W3) is increased from T2 to T3, and the outlet of the refrigerant heater 2 is increased. Temperature detector 1 provided on tube 4
In the control device which controls the closing time T1 of the on-off valve 8 according to the temperature detected by 4, the on-off valve 8 is opened before the liquid refrigerant is filled in the liquid receiver 5, and the liquid refrigerant is gas-liquid. Since it flows into the separator 1, the amount of liquid refrigerant supplied to the refrigerant heater 2 is insufficient by W20-W18, and the refrigerant heater 2
In the above, there is a problem that the liquid refrigerant is locally insufficient and overheats, and the system reliability such as thermal decomposition of the refrigerant and durability of the refrigerant heater 2 is impaired.

Further, when the opening / closing valve 8 is opened, the refrigerant pressure P1 in the liquid receiver 5 is lower than the refrigerant pressure P2 in the gas-liquid separator 1, that is, in the pressure equalizing pipe 9. There is a difference, and when the on-off valve 8 opens, an offensive sound is emitted from the valve.

The present invention solves the above problems by stably supplying the liquid refrigerant necessary for the refrigerant heater, preventing abnormal overheating of the refrigerant in the refrigerant heater, and improving the reliability, low noise, and noise of the device. The purpose is to ensure stable heating.

[0010]

In order to achieve the above-mentioned object, the present invention provides a liquid receiver provided above the gas-liquid separator, in which a refrigerant heater and a gas-liquid separator are connected by an annular pipe line.
A drop pipe having a check valve is connected to the gas-liquid separator, a pressure equalizing pipe having an on-off valve is used to connect the liquid receiver to the annular pipe line, and the gas-liquid separator, the radiator, the second check valve, and the receiving valve are connected. A control device for opening the on-off valve by detecting that the liquid receiver is filled with the liquid refrigerant is provided by forming a ring-shaped heat transfer passage by sequentially connecting the liquid devices with each other.

[0011]

According to the present invention, since the liquid receiver is always filled with the liquid refrigerant and the on-off valve is opened, the time for which the liquid refrigerant is filled in the liquid receiver is long when the pipe is long and the amount of the refrigerant is small. Even if it becomes long, enough liquid refrigerant flows into the gas-liquid separator and is supplied to the refrigerant heater, so there is no shortage of liquid refrigerant, and the amount of refrigerant and refrigerant that is pumped and condensed from the refrigerant heater to the radiator The required amount of refrigerant supplied to the heater can be balanced.

[0012]

Embodiments of the present invention will be described below with reference to FIGS.

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

In the present embodiment, the state in which the liquid receiver 5 is filled with the liquid refrigerant is changed from the radiator 10 to the second check valve 1.
2, paying attention to the fact that it is synchronized with the change in the liquid refrigerant pressure in the passage leading to the liquid receiver 5, a pressure detector 19 is provided in the passage, and the pressure detected by the pressure detector 19 is detected. Control device 20 for opening the on-off valve 8 after the change from decrease to increase
Is provided.

The operation of the above configuration will be described based on the control flow of FIG. After the heating is started, the on-off valve 8 is closed and the pressure detector 19 detects the pressure P. Then t
The pressure P ′ after a second is detected and compared with the pressure P. If P ′ ≧ P, it is determined that the liquid receiver 5 is filled with the liquid refrigerant, and the on-off valve 8 is opened for the time T4. The time T4 may be set to such a time that the liquid refrigerant in the liquid receiver 5 is completely dropped into the gas-liquid separator 1. If the pressure P '<P, the liquid refrigerant is flowing into the liquid receiver 5, so that the pressure P'is obtained at intervals of t seconds.
Is sampling.

After the on-off valve 8 is opened for the time T4, the on-off valve 8 is closed. Repeat this cycle.

According to the configuration of this embodiment, the liquid refrigerant pressure in the passage extending from the radiator 10 to the second check valve 12 and the liquid receiver 5 when the liquid receiver 5 is filled with the liquid refrigerant. Is detected and the on-off valve 8 is opened. Therefore, even if the liquid refrigerant is filled in the liquid receiver 5 for a long time with a long piping and a low refrigerant amount, a sufficient liquid refrigerant is vapor-liquid. Inflow into the separator 1,
Since it is supplied to the refrigerant heater 2, the liquid refrigerant does not run short.

Therefore, the amount of the refrigerant that is pumped from the refrigerant heater 2 to the radiator 10 and condensed is balanced with the required amount of the refrigerant that is supplied to the refrigerant heater 2, preventing abnormal overheating of the refrigerant in the refrigerant heater 2. The reliability of the device and stable heating can be ensured.

When the opening / closing valve 8 is opened, the refrigerant pressure P1 in the liquid receiver 5 is not lower than the refrigerant pressure P2 in the gas-liquid separator 1, that is, the pressure equalizing pipe 9, and the opening / closing valve 8 is opened. There is no harsh sound from the valve.

[0020]

As described above, in the heat transfer device of the present invention, the refrigerant heater and the gas-liquid separator are connected by the annular pipe line, and the liquid receiver provided above the gas-liquid separator is the first check valve. Is connected to the gas-liquid separator with a drop pipe having a valve, and the receiver is connected to the annular conduit with a pressure equalizing pipe having an on-off valve, and the gas-liquid separator, the radiator, the second check valve, and the receiver are connected. Since a loop-shaped heat transfer passage is formed by sequentially connecting pipes and a control device for detecting that the liquid receiver is filled with the liquid refrigerant and opening the on-off valve is provided, the liquid receiver is always provided. It is possible to open the on-off valve after the liquid refrigerant is filled with the liquid refrigerant, and with long piping and a low refrigerant amount, even when the liquid refrigerant is filled in the receiver for a long time, sufficient liquid refrigerant is vaporized Since it flows into the separator and is supplied to the refrigerant heater, there is no shortage of liquid refrigerant. Balance the amount of refrigerant that is pumped to the radiator and condensed and the required amount of refrigerant that is supplied to the refrigerant heater to prevent abnormal refrigerant overheating in the refrigerant heater, and ensure device reliability and stable heating. You can

[Brief description of drawings]

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

FIG. 2 is a control flowchart of the device.

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

FIG. 4 is a time chart of the device.

[Explanation of symbols]

 1 Gas-Liquid Separator 2 Refrigerant Heater 5 Liquid Receiver 6 First Check Valve 7 Falling Pipe 8 Opening / Closing Valve 9 Pressure Equalizing Pipe 10 Radiator 12 Second Check Valve 19 Pressure Detector 20 Control Mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsunori Sakuratake 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A refrigerant heater and a gas-liquid separator are connected by an annular pipe line, and a liquid receiver provided above the gas-liquid separator is connected to the gas-liquid separator by a drop pipe having a first check valve. ,
The liquid receiver is connected to the annular pipe line by a pressure equalizing pipe having an on-off valve, and the gas-liquid separator, the radiator, the second check valve, and the liquid receiver are sequentially pipe-connected to form an annular heat transfer passage. A heat transfer device provided with a control device that detects that the liquid receiver is filled with the liquid refrigerant and opens the on-off valve. 2. A pressure detector is provided in the passage extending from the radiator to the second check valve and the liquid receiver, and the on-off valve is opened after the pressure detected by the pressure detector has changed from decreasing to rising. The heat transfer device according to claim 1, further comprising a control device.