JPH0827004B2 - Heating system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device that heats a refrigerant and performs heating operation by a non-powered heat transfer system.

2. Description of the Related Art Conventionally, in this type of heating device, as shown in FIG. 2, a gas-liquid separator 3 is arranged at an intermediate position of a liquid receiver 2 located above the refrigerant heater 1 and the liquid receiver 2 is provided. The opening and closing valve 5 for equalizing the pressure between the gas-liquid separator 3 and the gas-liquid separator 3 is provided. The refrigerant evaporated in the refrigerant heater 1 is condensed in the radiator 6 and flows into the liquid receiver 2. When the liquid refrigerant collects in the liquid receiver 2, the on-off valve 4 is opened and the liquid receiver 2 and the gas-liquid separator 3 are pressure-equalized so that the liquid refrigerant in the liquid receiver 2 flows into the gas-liquid separator 3. When the inflow is completed, the on-off valve 4 is closed and the check valve 5 is also closed, so that the liquid refrigerant condensed from the radiator 6 again flows into the liquid receiver 2. By repeating such operations, heat transfer is performed to perform heating operation. (For example, Japanese Utility Model Laid-Open No. 61-43679) Problems to be Solved by the Invention However, in the configuration of the conventional example described above, the refrigerant flowing in the connecting pipe of the refrigerant heater 1 and the gas-liquid separator 3 is naturally circulated due to the difference in specific gravity. is there. When the refrigerant heater is heated by a burner, it is necessary to always discharge the refrigerant from the refrigerant heater in a gas-liquid two-phase state in a saturated gas state in order to prevent the refrigerant from becoming hot and thermally decomposing. Therefore, (1) When the outlet pipe of the refrigerant heater 1 is inserted from above the gas-liquid separator 3, the length of the pipe in the middle increases the resistance and accordingly the liquid level in the gas-liquid separator needs to be raised accordingly. As a result, the entire device becomes large.

(2) The temperature of the refrigerant flowing from the liquid receiver 2 into the gas-liquid separator 3 by opening and closing the on-off valve 4 is the supercooled liquid cooled by the radiator 6 and is lower than the gas temperature of the gas-liquid separator 3. The gas in the gas-liquid separator 3 is condensed by this supercooled liquid, and the pressure in the gas-liquid separator 3 drops. When the inflow of the supercooled liquid refrigerant from the liquid receiver 2 to the gas-liquid separator 3 is stopped, the pressure inside the gas-liquid separator 3 rises again and the pressure inside the gas-liquid separator 3 fluctuates. The refrigerant flowing between the refrigerant heater 1 and the gas-liquid separator 3 is natural circulation in which the difference in specific gravity is balanced by the flow resistance, and the refrigerant flows from the refrigerant heater 1 to the gas-liquid separator 3 as gas and the gas-liquid separator 3
Since the liquid flows from the refrigerant heater 1 to the refrigerant heater 1, the resistance flowing from the refrigerant heater 1 to the gas-liquid separator 3 is large (because the gas has a larger specific volume and a higher flow velocity than the liquid). for that reason,
When the pressure in the gas-liquid separator 3 becomes low, the flow rate of this refrigerant becomes a reverse flow from the inlet pipe of the refrigerant heater 1 to the gas-liquid separator 3, and the low-temperature liquid refrigerant circulates in the refrigerant heater 1. Disappear. Therefore, the temperature of the refrigerant temporarily rises in the refrigerant heater 1 to cause thermal decomposition. In order to prevent this, it is necessary to make the refrigerant liquid level in the gas-liquid separator 3 larger than that of the refrigerant heater 1 to secure a natural circulation amount or to increase the heat capacity of the refrigerant heater 1. there were. This increases the size of the entire device and increases the cost of parts.

(3) Open / close valve 4 for equalizing the pressure between the liquid receiver 2 and the gas-liquid separator 3
The direct connection of the to the gas-liquid separator 3 increases the number of connection ports of the gas-liquid separator 3 and increases the processing cost.

 Had problems such as.

The present invention is to solve such conventional problems, the circulation of the refrigerant heater to be heated by a gas-liquid separator and a burner, etc., the upper part of the refrigerant heater and the radiator are connected by a connecting pipe, by condensation of the radiator. By circulating the refrigerant in the refrigerant heater in the condensation pressure differential circulation cycle, the heating device can be made smaller and more compact, the processing cost can be further reduced, and the circulation of the refrigerant flowing through the refrigerant heater can be forcibly promoted. The purpose is to prevent overheating of the refrigerant.

Means for Solving the Problems In order to solve the above problems, in a heating device of the present invention, a liquid receiver is disposed above a refrigerant heater, and a radiator, a first check valve, and the liquid receiver are provided. A connecting pipe connecting the second check valve and the refrigerant heater, and a pressure equalizing pipe having an on-off valve between the connecting pipe connecting the upper part of the refrigerant heater and the radiator and the liquid receiver. Provided, further connecting the refrigerant reservoir provided above the refrigerant heater, the lower portion of the refrigerant reservoir portion and the lower portion of the refrigerant heater, the outlet pipe provided in the upper portion of the refrigerant heater is the connection pipe The inlet pipe provided in the lower part of the refrigerant heater, which is communicated with the refrigerant heater, is connected to the second check valve.

Effect of the Invention With the above-described configuration, the present invention allows the outlet pipe of the refrigerant heater to communicate with the connection pipe to the radiator, the inlet pipe of the refrigerant heater to be connected to the second check valve, and the receiver and the outlet. Since the tubes are connected by a pressure equalizing tube having an on-off valve, the refrigerant heater and the radiator can be directly connected, and the gas refrigerant discharged from the refrigerant heater is condensed by the radiator. Since the radiator radiates the heat of the high temperature gas refrigerant and turns it into a liquid refrigerant, the pressure of the refrigerant decreases. Due to the difference in condensation pressure due to this condensation, the high temperature gas in the refrigerant heater is sucked from the refrigerant heater to the radiator. The liquid refrigerant accumulated in the radiator is sucked into the liquid receiver by the liquid receiver and the check valve due to the condensation pressure reduction of the liquid receiver, and then flows into the refrigerant heater by opening the on-off valve of the pressure equalizing pipe.
Therefore, the refrigerant in the refrigerant heater circulates a certain amount or more of refrigerant during operation because the gas refrigerant is always condensed in the radiator. When the amount of the refrigerant heated by the refrigerant heater is increased to gas, the liquid refrigerant flows from the lower part of the refrigerant reservoir provided above the refrigerant heater to the lower part of the refrigerant heater, so that the inside of the refrigerant heater is always 2 A uniform temperature is achieved in the phase state. Therefore, the refrigerant and the oil are not overheated and the piping space of the refrigerant heater can be downsized, and the heating device can be downsized. Also, since the refrigerant heated and gasified by the refrigerant heater is directly conveyed to the radiator, the refrigerant entering the radiator has a high gas ratio and can be set as superheated gas, so the heat exchange of the radiator can be made highly efficient and the heat exchanger A compact size is obtained, and the warm air temperature rises, improving the feeling of heating. Furthermore, in the refrigerant heater, the low-temperature refrigerant from the liquid receiver flows in from the inlet pipe, and the high-temperature refrigerant is sent from the connecting pipe to the radiator, so the temperature of the refrigerant is lowered overall and the heat exchange performance is improved. Reliability is improved without overheating.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings. The same parts as those in FIG. 2 are designated by the same reference numerals. In FIG. 1, reference numeral 1 is a refrigerant heater disposed below the refrigerant reservoir 3 and the liquid receiver 2 and is configured to transfer heat from a burner or the like to the refrigerant (for example, combustion. A cooling medium passage is made of aluminum, copper, or the like on the outer circumference of the chamber, and 7 is a rising pipe that rises from the outlet of the refrigerant heater 1 and is in close contact with the refrigerant reservoir 3 (for example, the rising pipe 7). Is made of copper or aluminum and is brazed to the refrigerant reservoir 3 and is attached by caulking so that the heat can be transferred easily.), 8 is the second check valve 5 at the lower end of the receiver 2 and the refrigerant heating An inlet pipe connecting the inlet pipe of the container 1 and a reference pipe 9 are provided in the refrigerant reservoir 3 and a lower portion of the refrigerant heater. The same effect can be obtained by providing the adjusting pipe in the middle of the inlet pipe 8. And 10 is a start-up tube 7
And connecting pipe for connecting the radiator 6 with the radiator 6, 11 is a first check valve, 2
Is a liquid receiver 5 disposed above the refrigerant heater 1.
Is a second check valve, and the refrigerant heater 1, start-up pipe 7, connecting pipe 10, radiator 6, first check valve 11, liquid receiver 2, and second check valve 5 are refrigerant circulation circuits. A pressure equalizing pipe 12 having an on-off valve 4 is arranged between the connection pipe 10 and the liquid receiver 2.

In the above configuration, the refrigerant heated by the refrigerant heater 1 by the burner or the like flows in the two-phase state through the riser pipe 7 into the connecting pipe 10, and the liquid refrigerant flows from the receiver 2 through the inlet pipe 8 to heat the refrigerant. Bowl 1
Flow into. Further, the gas refrigerant of the two-phase refrigerant flowing into the connecting pipe 10 from the refrigerant heater 1 is condensed and liquefied by the radiator 6. At this time, when the open / close valve 4 is closed, the condensed refrigerant from the radiator 6 is sucked into the liquid receiver 2 through the first check valve 11. At this time, the second check valve 5 is in a closed state, and the pressure in the liquid receiver 2 is drastically reduced by the sucked condensed refrigerant, and the heat sink 6 in the liquid receiver 2 is closed.
Filled with condensed refrigerant liquid from. When the on-off valve 4 is opened in this state, the liquid receiver 2 and the refrigerant heater 1 are in a pressure equalizing state, and the liquid refrigerant in the liquid receiver 2 passes through the second check valve 5 and the refrigerant heater 1
It flows in by potential energy. At this time, the first check valve 11 is closed and the gas refrigerant discharged from the refrigerant heater 1 is condensed and accumulated in the radiator 6. Next, when the on-off valve 4 is closed,
The gas refrigerant is condensed again in the liquid receiver 2, the second check valve is closed due to the reverse pressure, and the cycle in which the refrigerant from the radiator 6 is sucked through the first check valve 11 is repeated. That is, in the cycle of the refrigerant heater 1, the radiator 6, the first check valve 11, the liquid receiver 2 and the second check valve 5, the liquid refrigerant from the radiator 6 is accumulated in the liquid receiver 2 and stored therein. This is an intermittent operation cycle in which the refrigerant heater 1 is intermittently supplied. Here, since the outlet pipe of the refrigerant heater 1 communicates with the connection pipe 10 arranged above the refrigerant heater 1 from the lower end to the rising pipe 7, the outlet of the refrigerant heater 1 is connected to the radiator 6 Can be connected in the shortest distance to reduce the pipeline resistance.
The refrigerant in the refrigerant heater 1 circulates a certain amount of refrigerant during the heating operation. When the amount of the refrigerant in the refrigerant heater 1 heated and becoming gas increases, the liquid refrigerant passes from the lower part of the refrigerant reservoir 3 provided above the refrigerant heater 1 to the lower part of the refrigerant heater 1 through the adjusting pipe 9. Because of the inflow, the inside of the refrigerant heater 1 always has a uniform temperature in a two-phase state. Further, when the amount of the liquid refrigerant in the refrigerant heater 1 increases, the refrigerant flows from the refrigerant heater 1 to the refrigerant reservoir 3 through the adjusting pipe 9 conversely. Therefore, the refrigerant and the oil are not overheated and the piping space of the refrigerant heater 1 can be downsized, and the heating device can be downsized and compact. Further, since the refrigerant heated and gasified by the refrigerant heater is directly conveyed to the radiator 6, the refrigerant entering the radiator 6 has a high gas ratio and can be set as a superheated gas, so that the heat exchange of the radiator 6 can be made highly efficient, The exchanger can be made smaller and more compact, and the warm air temperature rises, improving the feeling of heating. Further, in the refrigerant heater 1, the low temperature refrigerant from the liquid receiver 2 flows in through the inlet pipe 8, and the high temperature refrigerant is connected to the connecting pipe 10.
Since it is sent from the heat sink 6 to the radiator 6, the temperature of the refrigerant is lowered as a whole, heat exchange performance is improved, and local overheating does not occur, and reliability is improved. In addition, since the riser pipe 7 that connects the refrigerant reservoir 3 and the gas portion of the refrigerant heater 1 to the radiator 6 is provided in close contact, heat transfer greatly increases during this time, and the refrigerant heater 1 When the outlet refrigerant temperature becomes overheated, the heat causes a rapid increase in the gas phase in the refrigerant reservoir 3, and the refrigerant quickly moves from the refrigerant reservoir 3 to the refrigerant heater 1. When the outlet temperature of the refrigerant heater 1 is low and there are two liquid phases, the heat flows from the refrigerant reservoir 3 to the rising pipe 7 conversely, the gas phase in the refrigerant reservoir 3 decreases, and the rising pipe 7 Is a refrigerant with many gas phases. Therefore, the heat transfer amount to the radiator 6 is stable,
The amount of refrigerant in the circulation circuit can be adjusted automatically and optimally to the radiator 6
The amount of heat radiated is stable and comfort is improved.

Further, the flow rate of the two-phase refrigerant flowing out from the outlet pipe 7 of the refrigerant heater 1 is forcedly circulated. Therefore, it is necessary to keep the liquid level in the gas-liquid separator at a certain level or more with respect to the refrigerant heater 1 as compared with the case where natural circulation of the liquid refrigerant from the gas-liquid separator to the refrigerant heater 1 is considered. In addition, the piping space between the gas-liquid separator and the refrigerant heater can be downsized, and the heating device can be downsized.

Effects of the Invention As described above, the heating device of the present invention has the following effects.

(1) An outlet pipe of the refrigerant heater communicates with a connecting pipe to the radiator, an inlet pipe of the refrigerant heater is connected to the second check valve, and a receiver and an outlet pipe have an opening / closing valve. Since it is connected by a pressure tube, the refrigerant heater and radiator can be directly connected, and the gas refrigerant discharged from the refrigerant heater is condensed by the radiator, so the pressure of the refrigerant decreases, and due to this condensation pressure difference due to condensation, the temperature of the refrigerant heater rises. Since the gas is always sucked from the refrigerant heater to the radiator,
The refrigerant in the refrigerant heater circulates a certain amount of refrigerant during the heating operation. Therefore, it is not necessary to keep the liquid level in the gas-liquid separator at a certain position or more with respect to the refrigerant heater 1, and the piping space between the gas-liquid separator and the refrigerant heater can be downsized, and the heating device can be downsized. There is an effect that it can be made compact.

(2) When the refrigerant in the refrigerant heater is heated and becomes a large amount of gas, the liquid refrigerant flows from the lower part of the refrigerant reservoir provided above the refrigerant heater to the lower part of the refrigerant heater. Always has a uniform temperature in a two-phase state. Therefore, the refrigerant and the oil are not overheated and the piping space of the refrigerant heater can be downsized, and the heating device can be downsized.

(3) Further, since the refrigerant heated and gasified by the refrigerant heater is directly conveyed to the radiator, the refrigerant entering the radiator has a high gas ratio and can be set as superheated gas, so that the heat exchange of the radiator can be made highly efficient, The exchanger can be made smaller and more compact, and the warm air temperature rises, improving the feeling of heating.

(4) Further, in the refrigerant heater, the low-temperature refrigerant from the liquid receiver flows in through the inlet pipe, and the high-temperature refrigerant is sent from the connecting pipe to the radiator, so that the temperature of the refrigerant is lowered overall and the heat exchange performance is improved. However, reliability is improved without causing local overheating.

(5) In addition, the heat transfer is significantly increased between the refrigerant reservoir, the upper part of the refrigerant heater, and the riser pipe that connects the radiator to each other. When the outlet refrigerant temperature becomes overheated, the heat causes the gas phase to rapidly increase in the refrigerant reservoir, and the refrigerant quickly moves from the refrigerant reservoir to the refrigerant heater. When the outlet temperature of the refrigerant heater is low and there are two phases with many liquid phases, on the contrary, heat flows from the refrigerant reservoir to the rising pipe, the gas phase in the refrigerant reservoir decreases, and the rising pipe has many gas phases. Becomes For this reason, the amount of heat transferred to the radiator is stable, the amount of refrigerant in the circulation circuit can be automatically and optimally adjusted, and the amount of heat radiated from the radiator is stable, improving comfort.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram of a heating device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram of a conventional heating device. 1 ... Refrigerant heater, 2 ... Liquid receiver, 3 ... Refrigerant reservoir,
4 ... on-off valve, 5 ... second check valve, 6 ... radiator, 7 ...
… Startup pipe, 8 …… Inlet pipe, 9 …… Control pipe, 10 …… Connection pipe, 11 …… First check valve, 12 …… Equalization pipe.

 ─────────────────────────────────────────────────── ─── 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 connection pipe for arranging a liquid receiver above a refrigerant heater to connect the radiator, the first check valve, the liquid receiver, the second check valve, and the refrigerant heater. A connection pipe connecting the upper part of the refrigerant heater and the radiator, and a pressure equalizing pipe having an on-off valve between the connection pipe and the liquid receiver, and further above the refrigerant heater. A refrigerant reservoir provided at a lower portion of the refrigerant heater and an outlet pipe provided at an upper portion of the refrigerant heater communicate with the connection pipe, and an inlet pipe provided at a lower portion of the refrigerant heater is the second pipe. A heating system connected with a check valve. 2. The heating device according to claim 1, wherein the refrigerant reservoir portion and a connecting pipe connecting the upper portion of the refrigerant heater and the radiator are provided in close contact with each other.