JPH1114094A - Low-temperature medium generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration in capacity due to the decline in the flow rate of a medium. SOLUTION: A first evaporator 50 is constructed so as to heat exchange a first refrigerant line 3 which circulates a first cooling circuit 10, and a first circulation part 31 which is arranged along the first refrigerant line 3. A second evaporator 60 is constructed so as to heat exchange a second refrigerant line 13 which circulates a second cooling circuit 20, and a second circulation part 32 which is arranged along the second refrigerant line 13. The first and the second evaporators have a bypass circuit 38 which has one end connected with the downstream side of the second circulation part 32 and the other end connected with a circulation circuit 40 between a heat exchanger 33 and the suction side of a circulating pump 35 through a flow rate regulating means 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-temperature medium generator having a structure for circulating a medium to exchange heat and control a cooling capacity.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional low-temperature medium generator includes a first compressor 1, a first condenser 2,
A first cooling circuit 10 in which a first evaporator 50 is connected in series, a second cooling circuit 20 in which a second compressor 11, a second condenser 12, and a second evaporator 60 are connected in series, are parallel to each other. First distribution unit 3 connected to
The first and second circulation units 32, the heat exchanger 33 that exchanges heat with the medium (water, brine, etc.) that has passed through the first circulation unit 31 and the second circulation unit 32, and the medium that has passed through the heat exchanger 33 And a circulation circuit 40 in which a circulation pump 35 that feeds and circulates to the first circulation part 31 and the second circulation part 32 is connected in series.

[0003] A branch point A on the upstream side of the first circulation part 31 and the second circulation part 32 is communicated with the discharge port side of the circulation pump 35, and the first circulation part 31 and the second circulation part 32 are connected to each other. Is connected to the heat exchanger 33 at the downstream side of the junction B.

Further, in the low-temperature medium generating device, the first evaporator 50 includes a first cooling circuit 10 provided by a first circulation section 31 disposed along a first refrigerant pipe 3 circulating in the first cooling circuit. And the heat exchange between the circulation circuit 40 and the second evaporator 60. The second evaporator 60 is provided with a second circulation part 32 arranged along the second refrigerant pipe 13 circulating in the second cooling circuit. 2 cooling circuit 20 and distribution circuit 4
It is configured to exchange heat between zero.

[0005] In the vicinity of the heat exchanger 33, a blower 71 for blowing air to the heat exchanger 33 and a cool air outlet 73 for blowing cool air passing through the heat exchanger 33 are provided.

In this low-temperature medium generator, the low-temperature medium is, for example, water, and the water flows to the first and second circulation sections 31 and 32 by the circulation pump 35. Water flowing inside the first and second circulation sections 31 and 32 is cooled by the first and second evaporators 50 and 60. First and second
After passing through the circulation sections 31 and 32, the water passes through the heat exchanger 33, the water returns to the circulation pump 35 again, and the circulation cycle is repeated.

Another example of the prior art is disclosed in Japanese Patent Application Laid-Open No. 4-126934, in which an ice maker is connected to a brine recovery tank via a pipeline for circulating brine, and a low-temperature medium outlet pipe is connected to a heat source. A heating system is disclosed in which an exchanger is interposed and the heat exchanger and the brine recovery tank are connected to each other through a heat exchange pipe.

[0008]

In the conventional low-temperature medium generator, when the first and second cooling circuits 10 and 20 are installed, the unused side of the first and second circulation sections 31 and 32 is not used. At the confluence point B, there is a problem that the output temperature increases and the capacity of the evaporator on the used side decreases due to a decrease in the flow rate of the medium.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a low-temperature medium generator capable of preventing an increase in output temperature and a decrease in capacity due to a decrease in the flow rate of a medium being used.

[0010]

According to the present invention, a first cooling circuit in which a first compressor, a first condenser, and a first evaporator are connected in series, a second compressor, and a second condenser are provided. , A second cooling circuit in which a second evaporator is connected in series, a first flow section and a second flow section connected in parallel to each other, and a first flow section and a second flow section.
And a circulation circuit connected in series with a circulation pump that feeds and circulates the circulation part, and a branch point on an upstream side of the first circulation part and the second circulation part is communicated with a discharge port side of the circulation pump. The first circulation section and the second circulation section are joined on the downstream side, and the first evaporator is provided with a first refrigerant pipe circulating through the first cooling circuit; The first evaporator is configured to exchange heat with the first circulation unit disposed along the refrigerant pipe, and the second evaporator is configured to be the second evaporator.
A second refrigerant line that constitutes the cooling circuit of the above, and a low-temperature medium generating device that is configured to exchange heat with the second circulation portion disposed along the second refrigerant line, It is connected to the downstream side of the second circulation part and before the junction, and the other end is connected to the suction side of the circulation pump via a flow rate adjusting means to form a bypass circuit. A low temperature medium generator is obtained.

[0011]

[Function] A bypass circuit is provided between the suction port of the circulation pump from the upstream of the confluence section at the discharge port of the cooling circuit that is not operated at the time of cooling capacity or low load, and the medium before heat exchange is supplied to the suction port of the circulation pump. Return, increase the medium flow to the evaporator on the operated side, and lower the temperature of the cold medium at the outlet.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a low-temperature medium generator according to the present invention will be described below with reference to FIG.

Referring to FIG. 1, a low-temperature medium generator includes a first cooling circuit 10 in which a first compressor 1, a first condenser 2, and a first evaporator 50 are connected in series.
The second compressor 11, the second condenser 12, the second
Cooling circuit 2 in which evaporators 60 are connected in series
0, the first distribution unit 31 and the second distribution unit 31 connected in parallel with each other.
Distribution part 32, first distribution part 31, and second distribution part 32
A heat exchanger 33 that exchanges heat with a medium (water, brine, etc.) that has passed through the heat exchanger 33, and a circulation pump 35 that sends and circulates the medium that has passed through the heat exchanger 33 to the first circulation part 31 and the second circulation part 32. And a distribution circuit 40 connected to the

A branch point A on the upstream side of the first circulation part 31 and the second circulation part 32 communicates with the discharge port side of the circulation pump 35, and the first circulation part 31 and the second circulation part 32 Is connected to the heat exchanger 33 at the downstream side of the junction B.

In this low-temperature medium generating apparatus, the first evaporator 50 includes a first refrigerant line 3 which is an evaporating line of the refrigerant circulating in the first cooling circuit, and a first refrigerant line 3 connected to the first refrigerant line 3. The second evaporator 60 is configured to exchange heat with the first circulation part 31 of the medium to be cooled disposed along the second cooling circuit 20, which is an evaporating conduit of the refrigerant circulating in the second cooling circuit 20. The heat exchanger is configured to exchange heat with the pipe 13 and the second circulation part 32 of the medium to be cooled disposed along the second refrigerant pipe 13.

Furthermore, the bypass circuit 3
8 are connected. One end of the bypass circuit 38 is connected to the downstream side of the second circulation part 32 and before the junction B, and the other end is connected to the heat exchanger 33 and the suction side of the circulation pump 35 via the flow rate adjusting means 36. It is connected to the circulation circuit 40 between them.

The flow rate adjusting means 36 opens when the pressure on the capillary tube or the discharge port side increases, and opens the bypass circuit 3.
8 employs a pressure relief valve to increase the flow rate. In the vicinity of the heat exchanger 33, a blower 71 for blowing air to the heat exchanger 33 is provided.
And a cool air outlet 73 for blowing cool air that has passed through the heat exchanger 33.

The operation of the low-temperature medium generator according to one embodiment will be described below with reference to FIG. In the present description, an example in which water is used as the low-temperature medium will be described.

The water is supplied to the first and second water by the circulation pump 35.
Flows to the circulation parts 31 and 32 of the. Water flowing inside the first and second circulation sections 31 and 32 is cooled by the first and second evaporators 50 and 60. The water after passing through the first and second circulation sections 31 and 32 passes through the heat exchanger 33, and the water returns to the circulation pump 35 again to repeat the circulation cycle.

Now, in this low-temperature medium generator, the first
Assuming that one of the second evaporators 50 and 60 is the side where the second evaporator 60 is not used, the merging at the junction B raises the temperature on the discharge port side of the circulation circuit 40 or is used. The capacity decreases due to a decrease in the flow rate of the heat medium in the first evaporator 50 on the side.

Accordingly, a bypass circuit 38 provided between the suction port of the circulation pump 35 from the upstream of the junction B on the discharge port side of the second flow section 32 which is not operated at the time of cooling capacity or low load.
Thus, the water before the heat exchange in the heat exchanger 33 is returned to the suction port of the circulation pump 35, and the flow rate of the medium to the first circulation section 3 on the operated side is increased. Thereby, the temperature of the water at the junction B can be lowered.

[0022]

As described above, according to the low temperature medium generator of the present invention, according to the low temperature medium generating apparatus of the present invention, the cooling capacity and the discharge port side of the flow section which is not operated at the time of low load are located at the discharge port side from the upstream section of the merge section. By returning the low-temperature medium before heat exchange in the heat exchanger to the suction port of the circulation pump by a bypass circuit provided between the suction ports of the circulation pump, and increasing the medium flow rate to the circulation part on the operated side. As a result, the evaporating temperature of the cooling circuit rises, the cooling capacity improves, and the junction of the two fluids can prevent the temperature of the water from lowering.

Further, by using a pressure relief valve as the flow rate adjusting means, when the first and second cooling circuits are simultaneously operated, the bypass flow rate can be reduced to zero, so that the confluence during high load operation can be achieved. The temperature rise of the water at the point can also be zero.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a low-temperature medium generating device of the present invention.

FIG. 2 is a schematic configuration diagram showing a conventional low-temperature medium generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st compressor 2 1st condenser 3 1st refrigerant line 10 1st cooling circuit 11 2nd compressor 13 2nd refrigerant line 20 2nd cooling circuit 31 1st circulation part 32 2nd Flow section 33 Heat exchanger 35 Circulation pump 36 Flow rate adjusting means 38 Bypass circuit 40 Flow circuit 50 First evaporator 60 Second evaporator 71 Blower

Claims (4)

[Claims] 1. A first cooling circuit in which a first compressor, a first condenser, and a first evaporator are connected in series, and a second compressor, a second condenser, and a second evaporator are connected in series. A circulation circuit in which a second cooling circuit, a first circulation section and a second circulation section connected in parallel to each other, and a circulation pump for feeding and circulating the first circulation section and the second circulation section to each other are connected in series. A branch point on the upstream side of the first circulation part and the second circulation part is communicated with the discharge port side of the circulation pump,
And the second circulation part are joined on the downstream side,
The first evaporator is configured to exchange heat with a first refrigerant line that circulates through the first cooling circuit, and with the first circulation unit that is disposed along the first refrigerant line, The second evaporator is configured to exchange heat with a second refrigerant line that constitutes the second cooling circuit, and with the second circulation unit that is arranged along the second refrigerant line. A low-temperature medium generating device, one end of which is connected to the downstream side of the second flow portion and before the junction, and the other end of which is connected to the suction side of the circulating pump via a flow rate adjusting means to form a bypass circuit. A low-temperature medium generator characterized by being formed. 2. The low-temperature medium generator according to claim 1, wherein said flow rate adjusting means is a capillary tube. 3. The low-temperature medium generator according to claim 1, wherein the flow rate adjusting means is a pressure relief valve that opens when the pressure on the inlet side increases and increases the flow rate of the bypass circuit. Media generator. 4. The low-temperature medium generating device according to claim 1, wherein blowing means for blowing air to the heat exchanger, and blowing out cold air passing through the heat exchanger.