JP2720573B2 - heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater for heating a medium and performing a heating operation by a non-powered heat transfer system.

2. Description of the Related Art In a conventional heater of this type, a gas-liquid separator 3 is disposed at an intermediate position of a receiver 2 located above a medium heater 1 as shown in FIG. An on-off valve 4 for equalizing the two was provided between them, and a check valve 5 was provided between the receiver 2 and the gas-liquid separator 3. The medium evaporated in the medium heater 1 is condensed in the indoor heat exchanger 6 and flows into the receiver 2. When the liquid refrigerant accumulates in the receiver 2, the on-off valve 4 is opened to equalize the pressure in the receiver 2 and the gas-liquid separator 3, and the liquid refrigerant in the receiver 2 flows into the gas-liquid separator 3.
When the inflow has been completed, the on-off valve 4 is closed and the check valve 5 is also closed, so that the liquid refrigerant condensed from the indoor heat exchanger 6 flows into the receiver 2 again. Heating operation is performed by repeating such an operation to carry out heat transfer (for example, see Japanese Utility Model Application Laid-Open No.
No. 679).

Problems to be Solved by the Invention However, the above configuration has the following problems.

1. The medium in the connection pipe between the medium heater and the gas-liquid separator is naturally circulating, and it is necessary to output the medium heater outlet with a medium in a two-phase state in order to prevent thermal decomposition of the medium. However, when the medium heater outlet pipe is connected to the upper part of the gas-liquid separator, the gas-liquid separator is located above the medium heater. Therefore, it is necessary to increase the liquid level in the gas-liquid separator,
The height between the medium heater and the gas-liquid separator increases,
The entire device becomes larger.

2. In order to equalize the static pressure component in the gas-liquid separator and allow the liquid refrigerant accumulated in the receiver to flow in due to gravity difference, the open time of the on-off valve must be set longer, and the refrigerant circulation amount G (g / g se
c) When the cycle of the on-off valve (open time T ₀ + close time T ₁ ) is T, G = V × γ / T (V: receiver volume (cc)) (γ: liquid refrigerant density in receiver (g / cc) If T increases, G decreases and a large heat transfer amount cannot be obtained.

3. via the receiver from the gas-liquid medium amount Q ₁ leaving the gas-liquid separator to the indoor heat exchanger when the liquid medium component is mixed into the connection pipe Yuk to the indoor heat exchanger from the separator and the indoor heat exchanger intermittently Toka medium amount Q ₂ to which return to the gas-liquid separator Q _1> Q2
The medium gradually accumulates in the indoor heat exchanger and the medium pressure rises abnormally during the heating operation, so that stable heating operation cannot be performed.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and makes the configuration of the medium heater and the gas-liquid separator in the height direction small and compact. When the on-off valve is open, the liquid medium flows out of the receiver to the gas-liquid separator in a short time. Accordingly, it is an object to obtain a large heat transfer amount, improve the gas-liquid separator performance, and perform a stable heating operation.

Means for Solving the Problems To solve the above problems, the heater of the present invention comprises an indoor heat exchanger, a medium heater, a gas-liquid separator, and a receiver, and a pipe connection port A is provided at the top of the gas-liquid separator. The pipe connection port D and the connection port A of the two pipe connection ports D and E provided at the receiver top are provided via an on-off valve, and the connection port B is A pipe is connected to the bottom of the receiver via a first check valve, a connection port C is connected to one end of the indoor heat exchanger, and a connection port E at the top of the receiver is connected to the other end of the indoor heat exchanger via a second check valve. At the bottom of the gas-liquid separator, two pipe connection ports F and G are provided. The connection port F is connected to the bottom of the medium heater, and the pipe from the top of the medium heater is connected to the gas through the connection port G. Insert it into the liquid separator and open it under the cap of the connection port A at the top of the gas-liquid separator. A baffle plate is disposed above the liquid level stabilizer in the gas-liquid separator, and the lower end of the cap and the lower end of the first check valve are formed between the baffle plate and the liquid level stabilizer. The liquid level stabilizer is provided with voids.

Effect of the Invention With the above configuration, the medium heated by the medium heater flows in the gas-liquid separator in the two-phase state from the lower end of the gas-liquid separator into the gas-liquid separator at the shortest distance, so that the pipe resistance can be reduced. The minimum liquid level in the two-phase state guarantee can be lower for the media heater. Therefore, the configuration of the medium heater and the gas-liquid separator in the height direction can be reduced in size and size.

When the on-off valve is opened and the liquid medium accumulated in the receiver flows out of the receiver, the dynamic pressure component acts on the pipe inserted into the gas-liquid separator from the top of the medium heater into the receiver. The time required for the liquid medium to flow out to the gas-liquid separator can be reduced, and a large heat transfer amount can be obtained.

Further, the liquid medium of the two-phase medium flowing out of the top of the medium heater into the gas-liquid separator by the cap at the top of the gas-liquid separator travels along the cap wall surface and falls below the baffle plate into the gas-liquid separator through the liquid level stabilizer. When a cold liquid medium flows into the gas-liquid separator from the receiver when the on-off valve is opened, a gap is provided in the liquid level stabilizer below the first check valve, thereby preventing the cold liquid medium from scattering. The liquid inside the gas-liquid separator can be kept stable without reducing the pressure inside the gas-liquid separator and the liquid medium flowing into the medium heater flows backward, and the performance of the gas-liquid separator can be improved. Only the gas medium flows from to the indoor heat exchanger,
Since the excess liquid medium does not flow to the indoor heat exchanger, abnormal increase in medium pressure during the heating operation can be prevented, and stable heating operation can be performed.

Embodiment An embodiment of the present invention will be described below with reference to FIG. The same members as those in FIG. 2 are denoted by the same reference numerals.

In FIG. 1, 1 is a cap having a connection port A8 at the top.
A connection port B9 connected to the bottom of the receiver 2 via the first check valve 5 and a connection port C1 connected to one end of the indoor heat exchanger 6
0, and a medium heater disposed below the gas-liquid separator 3 having a connection port F14 and a connection port G15 at the bottom, and the receiver 2 is disposed above the gas-liquid separator 3. . The gas-liquid separator 3 and the medium heater 1 include a heater inlet pipe 16 connecting the bottom of the medium heater 1 and the connection port F,
The heater outlet pipe 17 connecting the top of the medium heater 1 and the connection port G15 is connected in a loop, and the heater outlet pipe 17 is inserted into the gas-liquid separator 3 and the front end opening is connected. It is below the mouth A8. Wall stabilizer inside gas-liquid separator
A baffle plate 19 is disposed above the lower end 18, and a lower end of the cap 11 and a lower end of the first check valve 5 are provided between the baffle plate 19 and the liquid level stabilizer 18. Voids in surface stabilizer 18
There are 20. At the top of the receiver 2, a connection port D12 for connecting the pressure equalizing pipe 21 from the connection port A8 via the on-off valve 4, and a connection port E13 for connecting the other end of the indoor heat exchanger 6 via the second check valve.
Is provided.

In the above configuration, the medium heated by the medium heater 1 is 2
In a phase state, the liquid medium flows into the gas-liquid separator 3 through the heater outlet pipe 17, passes through the wall surface of the cap 11, falls through the liquid level stabilizer 18 into the gas-liquid separator 3, and again enters the heater inlet pipe 16.
To the medium heater 1 through the On the other hand, the gas component of the two-phase medium flowing into the gas-liquid separator 3 from the medium heater 1 passes through the baffle plate 19 and is fed to the indoor heat exchanger 6 from the connection port C10 to be condensed and liquefied. At this time, when the on-off valve 4 is closed, the first
When the check valve 5 is closed, the supercooled liquid medium from the indoor heat exchanger 6 is pressure-fed to the receiver 2 through the second check valve 7,
The condensed liquid medium from the indoor heat exchanger 6 is condensed and liquefied, and the pressure in the receiver 2 drops rapidly, and the supercooled liquid medium in the indoor heat exchanger 6 is drawn into the receiver 2. Is filled with When the on-off valve 4 is opened in this state, the receiver 2 and the gas-liquid separator 3 are in a pressure equalized state, and the liquid medium in the receiver 2 flows into the gas-liquid separator 3 through the first check valve 5. At this time, the second check valve 7 is in the closed state.
Next, when the on-off valve 4 is closed, the first check valve 5 is closed and the supercooled liquid medium flows into the receiver 2 again from the indoor heat exchanger 6 to fill the receiver 2 with the condensed liquid medium and open the on-off valve 4. Is repeated. That is, the natural circulation cycle between the gas-liquid separator 3 and the medium heater 1, the gas-liquid separator 3, the indoor heat exchanger 6, the second check valve 7, the receiver 2, the first
The cycle of the check valve 5 is an intermittent operation cycle in which the supercooled liquid medium from the indoor heat exchanger 6 is stored in the receiver 2 and supplied intermittently to the gas-liquid separator 3. Here, since the outlet pipe of the medium heater 1 is inserted into the gas-liquid separator 3 from the bottom, the pipe resistance of the heater outlet pipe 17 becomes smaller than in the conventional art. The guaranteed liquid level in the gas-liquid separator 3 can be lowered. Therefore, the configuration of the medium heater 1 and the gas-liquid separator 3 in the height direction can be reduced in size and size. Since the opening of the heater outlet pipe 17 is provided below the cap 11 of the connection port A8 to which the equalizing pipe 21 is connected, the on-off valve 4 for supplying the liquid medium of the receiver 2 to the gas-liquid separator 3 is provided. Since the dynamic pressure component is applied to the inside of the receiver 2, the opening time can be reduced as compared with the related art, and as a result, a large heat transfer amount can be obtained. Further, since the opening of the heater outlet pipe 15 is provided in the cap 11 and the lower end of the cap is provided between the baffle plate 19 and the liquid level stabilizer 18, the liquid medium of the two-phase medium from the medium heater 1 is provided. Is transmitted to the gas-liquid separator 3 without disturbing the liquid level in the gas-liquid separator 3, and the on-off valve 4 is opened to allow the cold liquid medium to flow into the gas-liquid separator 3 from the receiver 2. Since the gap 20 is provided in the liquid level stabilizer 18 below the first check valve 5, the pressure of the gas-liquid separator 3 is reduced by preventing the cold liquid medium from being scattered. The liquid medium flowing into 1 flows backward, does not disturb the liquid level in the gas-liquid separator, maintains a stable liquid level, improves the performance of the gas-liquid separator, and achieves a stable heating operation without an abnormal increase in the medium pressure. Becomes possible.

Effects of the Invention As described above, according to the present invention, the height dimension between the medium heater and the gas-liquid separator can be reduced, the size and size of the entire apparatus can be reduced, and the heat transfer amount can be increased. In addition, the improvement of the gas-liquid separation performance of the gas-liquid separator enables a stable heating operation without abnormal increase of the medium pressure.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a heater according to an embodiment of the present invention. FIG. 2 is a circuit diagram of a conventional heater. DESCRIPTION OF SYMBOLS 1 ... Medium heater, 2 ... Receiver 3, ... Gas-liquid separator, 4 ... On-off valve, 5 ... First check valve, 6 ... Indoor heat exchanger, 7 ... Second check valve Connection port A, 9 Connection port B, 10 Connection port C, 11 Cap, 12 Connection port D, 13 Connection port E, 14 Connection port F, 15 … Connection port G, 18… liquid level stabilizer, 19… baffle plate, 20… void space.

Claims (1)

(57) [Claims] 1. An indoor heat exchanger, a medium heater, a gas-liquid separator, and a receiver. A cap having a pipe connection port A and pipe connection ports B and C are provided at the top of the gas-liquid separator. Out of the two provided pipe connection ports D and E, the pipe connection port D and the connection port A are connected via an on-off valve, and the connection port B is connected to the bottom of the receiver via a first check valve,
The connection port C is connected to one end of the indoor heat exchanger, the other end of the indoor heat exchanger is connected to the connection port E at the top of the receiver via a second check valve, and the bottom of the gas-liquid separator is connected to the other end.
A plurality of pipe connection ports F and G are provided, the connection port F is connected to the bottom of the medium heater, and the pipe from the top of the medium heater is inserted into the gas-liquid separator through the connection port G, and A baffle plate is provided below the cap of the connection port A at the top of the liquid separator and above the liquid level stabilizer in the gas-liquid separator, and the lower end of the cap and the lower end of the first check valve are connected to the baffle plate and the liquid level. A heater configured between the stabilizers, wherein a gap is provided in the liquid level stabilizer below the first check valve.