JPH1089801A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To operate a refrigerator by utilizing low-level waste heat of discharged hot water, etc., and achieve the reduction of running cost as compared with conventional refrigerators. SOLUTION: This refrigerator is provided with an injector pump 1 for feeding a refrigerant by the injection thrust of a high-pressure gas refrigerant. A medium- pressure gas line 2 of which one end is connected to a discharge port 1b of this injector pump 1 is connected to a refrigerant inlet 3a of a condenser 3 at the other end thereof, and a liquid line 4 of which one end is connected to a refrigerant outlet 3b of the condenser 3 is connected to a refrigerant inlet 6a of a cooler 6 via an expansion valve 5 at the other end thereof. A low-pressure gas line 7 of which one end is connected to a refrigerant outlet 6b of the cooler 6 is connected to a suction port 1a of the injector pump 1 at the other end thereof, and a branching liquid line 10 of which one end is connected to a refrigerant outlet 3c of the condenser 3 is connected to a refrigerant inlet 12a of a heater 12, which heats a liquid refrigerant to convert it into a high-pressure gas refrigerant, through a refrigerant pump 11 at the other end thereof. A high-pressure gas line 13 of which one end is connected to a refrigerant outlet 12b of the heater 12 is connected to a high-pressure gas refrigerant inlet 1c provided in the injector pump 1 and communicating to an injection nozzle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating apparatus having an ejector pump.

[0002]

2. Description of the Related Art Refrigeration systems having an ejector pump in place of a compressor have hitherto been known. For example, a steam injection refrigeration system has been put to practical use for air conditioning or for drying food. The ejector pump injects high-pressure gas from an injection nozzle to form a high-speed airflow, entrains the gas around the nozzle and discharges it.In a steam injection refrigeration system, the ejector pump injects high-pressure steam from the injection nozzle to cool the unit. The water vapor in the inside is sent to a condenser to condense, and the condensed water is sent to a cooler to evaporate again, thereby performing a freezing operation.

[0003] The above-described steam injection refrigeration apparatus has the advantage that the compressor is not required, the structure is simple and the handling is easy, and the drive power of the electric motor which is the power source of the compressor is not required. There is a problem that high-pressure steam is required as thrust of the pump.

[0004] In a food factory or the like, a large amount of hot waste water of about 60 ° C is discharged, but such warm waste water has conventionally been discarded without being used as a heat source.

Since the conventional steam injection refrigeration system requires high-pressure steam, it has not been possible to utilize the above-mentioned low-temperature waste heat such as hot waste water or other solar heat.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a refrigeration system that can operate using low-level waste heat such as hot waste water and has a significantly lower running cost than conventional refrigeration systems. To provide.

[0007]

In order to achieve the above object, a refrigerating apparatus according to the present invention includes an ejector pump for sending a refrigerant by a thrust of a high-pressure gas refrigerant, and one end is connected to a discharge port of the ejector pump. The other end of the medium-pressure gas line is connected to the refrigerant inlet of the condenser, and the other end of the liquid line, one end of which is connected to the refrigerant outlet of the condenser, is connected to the refrigerant inlet of the cooler via an expansion valve. The other end of the low-pressure gas line, one end of which is connected to the refrigerant outlet of the condenser, is connected to the suction port of the ejector pump, and the other end of the branch liquid line, one end of which is connected to the refrigerant outlet of the condenser, heats the liquid refrigerant. A high-pressure gas line connected to a refrigerant inlet of a heater to be turned into a high-pressure gas refrigerant via a refrigerant pump, and one end connected to a refrigerant outlet of the heater is connected to a high-pressure gas refrigerant inlet following an injection nozzle in the ejector pump. Contact There as those of the structure.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of a refrigerating apparatus according to the present invention. A liquid line having one end connected to a discharge port 1 b of the ejector pump 1, another end connected to a refrigerant inlet 3 a of the condenser 3, and one end connected to a first refrigerant outlet 3 b of the condenser 3. 4 is connected to a refrigerant inlet 6a of a cooler 6 via an expansion valve 5, and the other end of a low-pressure gas line 7 having one end connected to a refrigerant outlet 6b of the cooler 6 is connected to an ejector pump 1 Is connected to the suction port 1a.

Cooling water or air is supplied to the inside of the coil 8 of the condenser 3 to cool the inside of the condenser. Cooling water or brine or the like is provided in the cooling coil 9 of the condenser. The medium is flowed and sent to a cooled room or the like. The detailed structure of the ejector pump 1 will be described later.

Further, the other end of the branch liquid line 10 having one end connected to the second refrigerant outlet 3c of the condenser 3 is connected to the refrigerant inlet 12a of the heater 12 via the refrigerant pump 11, and The other end of the high-pressure gas line 13 whose one end is connected to the refrigerant outlet 12b of the
Is connected to the high-pressure gas refrigerant inlet 1c.

The heater 12 has a heating coil 14 to which hot water is supplied. As the hot water supplied to the heating coil, for example, hot waste water of about 60 ° C. discharged from a food factory or the like or hot water heated by solar heat is used.

The ejector pump 1 sucks the vaporized refrigerant in the cooler 6 and sends it to the condenser 3.
, A diffuser 16 having one end connected to the mixing chamber and the other end connected to the condenser 3 via the medium-pressure gas line 2, and a heater 12. It is composed of an injection nozzle 17 to which a high-pressure gas line 13 is connected.

The diffuser 16 has a small-diameter throat portion 16b formed following a reduced-diameter taper portion 16a whose diameter is reduced at a gentle angle from the mixing chamber 15 side, and a diametrically enlarged taper portion which gradually expands following the throat portion 16b. A portion 16c is formed.

In the ejector pump 1, high-pressure refrigerant gas from a high-pressure gas line 13 is ejected at high speed from an injection nozzle 17, and entrains the gas refrigerant in the mixing chamber 15, that is, the gas refrigerant from the cooler 6, and flows into the diffuser 16. , From the enlarged taper portion 16c.

In the embodiment described above, the heater 1
Although the hot water is used as the heating means of the refrigerant in 2 above, in addition to the heating with the hot water, it is also possible to perform the heat of combustion of the gas or the heating with the electric heater. Requires very little energy.

Next, the operation of the refrigeration apparatus according to the present invention having the above-described structure will be described with reference to a Mollier diagram shown in FIG. In addition, the operation of (1) shown below corresponds to the state change of the refrigerant shown in FIG.

The gas refrigerant discharged from the ejector pump 1 is sent to the condenser 3 by the medium-pressure gas line 2, cooled by cooling water or air flowing in the coil 8, and condensed to become a liquid refrigerant. The liquid refrigerant from the condenser 3 passes through the liquid line 4 from the refrigerant outlet 3 b and is decompressed by the expansion valve 5 and sent to the cooler 6. The refrigerant in the cooler 6 is vaporized to become a gas refrigerant, and the latent heat cools a cooling medium such as water or brine flowing in the cooling coil 9. The gas refrigerant from the cooler 6 is drawn into the ejector pump 1 via the low-pressure gas line 7.

A part of the liquid refrigerant from the condenser 3 flows to the branch liquid line 10 and is pressurized by the refrigerant pump 11,
It is sent to the heater 12. The refrigerant that has entered the heater 12 is heated and vaporized by the hot water flowing through the heating coil 14, and becomes a high-pressure gas refrigerant. The high-pressure gas refrigerant from the heater 12 is supplied to the high-pressure gas line 1
By 3, it is sent to the injection nozzle 17 of the ejector pump 1 and sent to the condenser together with the gas refrigerant sucked into the ejector pump from the cooler.

[0019]

Since the refrigerating apparatus according to the present invention has the above-described configuration, the following effects can be obtained. Since high-pressure gas refrigerant vaporized by low-level waste heat such as warm wastewater from a food factory or hot water heated by solar heat is used as the thrust of the ejector pump, conventional refrigeration equipment equipped with a compressor and high-pressure steam are used. The running cost can be remarkably reduced as compared with the refrigerating device of the above.

Further, the apparatus of the present invention has no drive unit other than the refrigerant pump for sending the liquid refrigerant from the condenser to the heater, has a simple structure, and does not require much equipment cost.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a refrigeration apparatus according to the present invention.

FIG. 2 is a longitudinal sectional view showing an example of an ejector pump.

FIG. 3 is a Mollier diagram of a refrigerant in the refrigeration apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ejector pump 2 Medium pressure gas line 3 Condenser 4 Liquid line 5 Expansion valve 6 Cooler 7 Low pressure gas line 8 Cooling water coil 9 Cooling coil 10 Branch liquid line 11 Refrigerant pump 12 Heater 13 High pressure gas line 14 Heating coil 15 Mixing Chamber 16 Diffuser 17 Injection nozzle

Claims (1)

[Claims] An ejector pump for sending a refrigerant by the injection thrust of a high-pressure gas refrigerant, the other end of a medium pressure gas line having one end connected to a discharge port of the ejector pump is connected to a refrigerant inlet of a condenser, and The other end of the liquid line, one end of which is connected to the refrigerant outlet of the cooler, is connected to the refrigerant inlet of the cooler via an expansion valve, and the other end of the low-pressure gas line, one end of which is connected to the refrigerant outlet of the cooler, is the ejector pump. The other end of the branched liquid line, one end of which is connected to the refrigerant outlet of the condenser, is connected via a refrigerant pump to the refrigerant inlet of a heater that heats the liquid refrigerant to a high-pressure gas refrigerant. And a high-pressure gas line having one end connected to the refrigerant outlet of the heater, connected to a high-pressure gas refrigerant inlet following the injection nozzle in the ejector pump.