JPH0827005B2 - 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 In a conventional heating device of this type, as shown in FIG. 2, a gas-liquid separator 3 is arranged at an intermediate position of a liquid receiver 2 located above a refrigerant heater 1 and the liquid receiver 2 is provided. The refrigerant heater 1 has a structure in which an opening / closing valve 4 for equalizing the pressure of the both is provided between the gas-liquid separator 3 and a check valve 5 is further provided between the liquid receiver 2 and the gas-liquid separator 3. The evaporated refrigerant is condensed by 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) Problem to be Solved by the Invention However, in the above-mentioned configuration, since the on-off valve having the pressure equalizing pipe is provided between the gas-liquid separator and the liquid receiver, the liquid receiver When the liquid refrigerant that has accumulated in the liquid refrigerant flows into the gas-liquid separator by opening the on-off valve, it equalizes only with the static pressure component and flows by the gravity action of the liquid refrigerant itself, so the opening time of the on-off valve should be set long. If the refrigerant circulation amount G (g / sec) and the on-off valve cycle (opening time T ₀ + closing time T ₁ ) are T, then G = V × γ / T (receiver volume (cc), From the liquid refrigerant density (g / cc) in the receiver, there is a problem that when T increases, G decreases and a large heat transfer amount cannot be obtained.

The present invention is to solve such conventional problems, when the on-off valve is open, the dynamic pressure component of the refrigerant evaporated in the refrigerant heater is introduced into the receiver, the liquid refrigerant accumulated in the receiver The purpose is to obtain a large heat transfer amount by allowing the gas to flow into the gas-liquid separator in a short time.

Means for Solving the Problems In order to solve the above problems, the heating device of the present invention has a refrigerant heater arranged below a gas-liquid separator, and the refrigerant heater and the gas-liquid separator are connected to the refrigerant heater inlet. While connecting the pipe and the refrigerant heater outlet pipe in a loop, the gas-liquid separator, the radiator, the second check valve, the liquid receiver disposed above the gas-liquid separator, and the first reverse. A stop valve and a refrigerant circuit in which the gas-liquid separator is sequentially connected by piping are provided, and a pressure equalizing pipe having an opening / closing valve is provided between the liquid receiver and the refrigerant heater outlet pipe.

Effect The present invention, when the liquid refrigerant that has flowed into the receiver by the above-described structure is made to flow into the gas-liquid separator by the gravity difference by opening the on-off valve, the dynamic pressure component of the refrigerant evaporated in the refrigerant heater is the refrigerant. Since it acts on the inside of the receiver via the heater outlet pipe and the on-off valve, the time required for the liquid refrigerant accumulated in the receiver due to the gravity difference plus the dynamic pressure component to completely flow into the gas-liquid separator can be shortened. Obtained,
The refrigerant circulation amount increases, and as a result, a large heat transfer amount can be obtained.

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 denotes a refrigerant heater arranged below the gas-liquid separator 3 and connected to the gas-liquid separator 3 in a loop with a refrigerant heating inlet pipe 7 and a refrigerant heating outlet pipe 8; Is a liquid receiver disposed above the gas-liquid separator 3 via the first check valve 5,
Reference numeral 6 is a radiator, the gas-liquid separator 3 and the radiator 6 are connected to each other through a gas outflow pipe 11, and the radiator 6 and the receiver 2 are connected via a second check valve 9.
Connected with the liquid return pipe 12, 1,8,3,7 natural circulation circuit and 3,
A pressure equalizing pipe 10 having a refrigerant circulation circuit of 6, 9, 2, 5 and having an opening / closing valve 4 between the liquid receiver 2 and the refrigerant heater outlet pipe 8.
Is provided.

In the above structure, the refrigerant heated by the refrigerant heater 1 passes through the refrigerant heater outlet pipe 8 and flows into the gas-liquid separator 3 in a two-phase state, and the liquid refrigerant component of the two-phase refrigerant is again introduced into the refrigerant heater inlet. It flows into the refrigerant heater 1 through the pipe 7. On the other hand, the gas refrigerant of the two-phase refrigerant that has flowed into the gas-liquid separator 3 from the refrigerant heater 1 passes through the gas outflow pipe 11 and is condensed by the radiator 6 to cool the refrigerant to a supercooled state. At this time, when the on-off valve 4 is closed, the first check valve 5 is closed because the pressure inside the gas-liquid separator 3 is high, and the liquid refrigerant circuit condensed by the radiator 6 is in a state of being blocked for a moment. When the pressure of the supercooled liquid refrigerant becomes slightly higher than the pressure in the liquid receiver 2, the supercooled refrigerant enters the liquid receiver 2 through the liquid return pipe 12 and the second check valve 9. Since the liquid refrigerant that has entered the liquid receiver 2 condenses the gaseous refrigerant inside the liquid receiver 2, the pressure inside the liquid receiver 2 is rapidly reduced. For example, in the receiver 2
When there is a saturated gas of 60 ° C and liquid refrigerant of 30 ° C (supercooling degree of 30deg) flows into the receiver 2 from the radiator 6, the saturation pressure of 60 ° C is 5kg to 6kg from 24kg / cm ² G (HCFC22). / cm ² receiver 2
To the pressure of. Then, the liquid refrigerant of the radiator 6 passes through the liquid return pipe 12 and the second check valve 9, and the pressure of the receiver 2 decreases.
The liquid is sucked in and the inside of the liquid receiver 2 is filled with the liquid refrigerant. When the on-off valve 4 is opened after a certain period of time, the gas-liquid two-phase refrigerant ejected from the refrigerant heater outlet pipe 8 is guided to the liquid receiver 2, and the movement of the two-phase refrigerant from the refrigerant heater outlet pipe 8 is further affected by gravity. A pressure component is added, and the liquid refrigerant in the liquid receiver 2 flows out into the gas-liquid separator 3 through the first check valve 5 in a short time. At this time, the second check valve 9
Is closed because the pressure of the liquid receiver 2 is high. Next, when the on-off valve 4 is closed for a certain period of time, the first check valve 5 is closed again, the supercooled liquid refrigerant flows into the receiver 2 from the radiator 6, and the inside of the receiver 2 is cooled by the liquid refrigerant. After a certain period of time, the operation of opening the on-off valve 4 is repeated. That is, the cycle between the gas-liquid separator 3 and the refrigerant heating 1 is the natural circulation cycle,
In the cycle of the gas-liquid separator 3, the radiator 6, the second check valve 9, the receiver 2 and the first check valve 5, the liquid refrigerant from the radiator 6 is accumulated in the receiver 2 and is intermittently stored. This is an intermittent operation cycle in which the gas-liquid separator 3 is supplied first. Since the on-off valve 4 is disposed between the refrigerant heater outlet pipe 8 and the liquid receiver 2 via the pressure equalizing pipe 10, liquid refrigerant accumulates in the liquid receiver 2, and the on-off valve is opened to receive the liquid. When the liquid refrigerant in the container 2 is caused to flow into the gas-liquid separator 3, the dynamic pressure component of the gas-liquid two-phase refrigerant ejected from the refrigerant heater outlet pipe 8 is added to the inside of the liquid receiver 2 in addition to the action of gravity. , Receiver 2
It is possible to shorten the time taken for the liquid refrigerant inside to flow into the gas-liquid separation chamber 3, and to increase the refrigerant circulation amount, and as a result, the heat transfer amount can be increased.

As described above, according to the heating device of the present invention, an opening / closing valve is provided between the liquid receiver and the refrigerant heating outlet pipe, and the opening / closing valve is opened to separate the liquid refrigerant in the liquid receiver into the gas-liquid separator. When flowing into the interior, since the dynamic pressure component of the refrigerant evaporated in the refrigerant heater acts on the inside of the receiver, the time until the liquid refrigerant inside the receiver completely flows into the gas-liquid separator can be shortened. This has the effect of increasing the heat transfer amount of the system.

[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 ... Gas-liquid separator,
4 ... on-off valve, 5 ... first check valve, 6 ... radiator, 7 ...
… Refrigerant heater inlet pipe, 8 …… Refrigerant heater outlet pipe, 9 ……
2nd check valve, 10 ... Pressure equalizing pipe.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Jakudo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Koichiro Yamaguchi, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A refrigerant heater is disposed below a gas-liquid separator, and the refrigerant heater and the gas-liquid separator are connected in a loop by a refrigerant heater inlet pipe and a refrigerant heater outlet pipe. On the other hand, the gas-liquid separator, the radiator, the second check valve, the liquid receiver disposed above the gas-liquid separator, the first check valve, and the refrigerant in which the gas-liquid separator is sequentially connected by piping. A heating device having a circuit, wherein a pressure equalizing pipe having an opening / closing valve is provided between the liquid receiver and the refrigerant heater outlet pipe.