JP2014169810A - Ejector type refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize an ejector type refrigerator by an ejector type refrigeration cycle to thereby narrow an installation space.SOLUTION: A large diameter pipeline part 8 using a pipeline having a large aperture is provided to a flow channel at an outlet of a condenser 4 liquefying refrigerant R discharged from an ejector 2. The large diameter pipeline part 8 is connected to an evaporator 3, and also connected to a refrigerant circulation pump 5 to supply the refrigerant R to a generator 1 and circulate it. The refrigerant R returned in a liquid state by the condenser 4 is stored in the large diameter pipeline part 8, and then is supplied to the generator 1 and the evaporator 3. Consequently, the refrigerant R can be stably and continuously supplied.

Description

  The present invention relates to a structure of a refrigerator using an ejector-type refrigeration cycle, and relates to an ejector-type refrigerator that is downsized.

  There is an ejector-type refrigerator that uses an ejector-type refrigeration cycle that can reduce energy loss and improve refrigeration efficiency and promote energy saving. Such an ejector type refrigerator has advantages such as being able to promote downsizing and weight reduction. In addition, this type of ejector refrigeration system mainly includes a refrigeration circuit including an ejector, a heating device, an evaporator, a condenser, an expansion valve, and a refrigerant pump. On the other hand, the applicant of the present application has proposed an ejector refrigeration system in which a working medium heated by a solar collector is supplied to an ejector as a heat source when the refrigerant is heated to generate refrigerant vapor to obtain cooling water. (See Patent Document 1).

  By the way, in a refrigeration apparatus using such an ejector, for example, as disclosed in Patent Document 2, a gas-liquid separation tank is disposed in a path from the ejector to the condenser to become liquid. The refrigerant is stored and can be stably supplied to the evaporator. Patent Document 3 discloses an ejector cycle in which surplus refrigerant is stored in a refrigerant pipe as a liquid phase refrigerant in order to reduce the capacity of the gas-liquid separator. Further, for example, in an ejector refrigeration cycle unit disclosed in Patent Document 4, a tank that distributes or collects refrigerant flows to a plurality of refrigerant passages of an evaporator is disposed.

  Fig. 4 is a block diagram showing an example of this type of ejector-type refrigeration cycle. In particular, hot water containing various types of waste heat, such as hot water of about 85 ° C, that is discarded from production facilities such as factories is input. The ejector type refrigerator of the system which does is shown. The charged hot water Wh evaporates the refrigerant R through the generator 1 to generate steam. This steam is supplied to the ejector 2 to generate the cooling water Wc through the evaporator 3 by using the suction effect when passing through the nozzle portion of the ejector 2 to make the evaporator 3 have a negative pressure and using the latent heat of evaporation as a low-temperature heat source. Supply to the desired equipment.

  In the nozzle section, the high-pressure refrigerant Rh evaporated in the generator 1 is decompressed to be a driving refrigerant, so that the suction refrigerant Rs is sucked from the evaporator 3 and the driving refrigerant and the suction refrigerant Rs sucked from the evaporator 3 are mixed. Then, it is supplied to the condenser 4, exchanged heat with the cooling water W, and returned to the liquid. The refrigerant R that has become liquid is stored in the receiver tank 7, and is continuously supplied from the receiver tank 7 to the generator 1 by the refrigerant circulation pump 5, and is also supplied to the evaporator 3 through the expansion valve 6.

JP 2010-96436 A JP 2003-222445 A JP 2004-324929 A JP 2007-192503 A

  As described above, in order to supply the refrigerant stably and continuously to the evaporator, the receiver tank 7 for storing the refrigerant is installed. In particular, a gas-liquid separator is inconvenient if the volume of the liquid phase is reduced below a certain level, and therefore requires a size that can secure a sufficient storage amount. For this reason, the receiver tank becomes large, and the external dimensions of the ejector type refrigerator are increased.

  Therefore, the present invention provides an ejector type refrigerator that can secure a sufficient storage amount, can stably supply refrigerant continuously to the evaporator, and can reduce the external dimensions of the refrigerator. The purpose is to do.

  As a technical means for achieving the above object, an ejector type refrigerator according to the present invention has an ejector type having an ejector that sucks a suction fluid by a driving fluid and cools the target fluid by latent heat of evaporation generated in the evaporator. In an ejector-type refrigerator in which a mixed fluid of driving fluid and suction fluid discharged from the ejector is liquefied by a condenser and returned to the evaporator, the liquefied mixed fluid is evaporated from the condenser. The pipe of the flow path leading to the vessel is a large diameter pipe part having a large diameter, and the liquefied mixed fluid is stored in the large diameter pipe part.

  In other words, the refrigerant liquefied with the capacity of the large-diameter pipe portion is stored so that stable supply to the evaporator can be continuously performed. The receiver tank can be omitted by making the capacity of the large-diameter pipe part sufficient. Moreover, the pipe | tube between a condenser and an evaporator can be shortened by making a diameter large enough.

  The ejector type refrigerator according to the invention of claim 2 is characterized in that the flow direction of the drive fluid and the mixed fluid in the ejector is inclined at an arbitrary angle with respect to the horizontal direction.

  That is, the longitudinal direction of the ejector is such that the flow direction of the driving fluid and the mixed fluid is inclined with respect to the conventional horizontal direction. For this reason, the posture of the ejector is inclined and the length required in the horizontal direction can be reduced.

  The tilting direction is preferably such that the driving fluid and the mixed fluid flow downward. The flow direction of the driving fluid and the mixed fluid can be either the upward direction or the downward direction, so that the effect of gravity can be used effectively.

  According to the ejector type refrigerator according to the present invention, since the receiver tank can be omitted, the size reduction of the ejector type refrigerator can be promoted.

  Further, according to the ejector type refrigerator according to the invention of claim 2, since the ejector is inclined, the horizontal length can be set smaller than when the ejector is installed in the horizontal direction. The horizontal dimension of the refrigerator can be reduced. Moreover, the ejector type refrigerator can be further downsized in combination with the installation of the large-diameter pipe section.

It is a schematic block diagram explaining the main characteristics which the ejector type refrigerator which concerns on this invention has. It is a schematic block diagram explaining another embodiment of the ejector-type refrigerator which concerns on this invention. It is a figure explaining the schematic structure of the conventional ejector type refrigerator.

  Hereinafter, an ejector type refrigerator according to the present invention will be described in detail based on the illustrated preferred embodiment.

  FIG. 1 is a block diagram illustrating a main configuration of an ejector type refrigerator 10 according to the present invention. In addition, the same code | symbol is attached | subjected about the same part as the ejector-type refrigerator shown in FIG.

  The ejector type refrigerator 10 mainly includes a generator 1, an ejector 2, an evaporator 3, a condenser 4, a refrigerant circulation pump 5, and an expansion valve 6. The generator 1 is supplied with hot water of about 85 ° C. discharged from the factory, waste heat from the cogeneration system, hot spring heat, or hot water Wh collected by a solar heat collector as a heat medium. The refrigerant R of the generator 1 is connected to the discharge side of the refrigerant circulation pump 5 so that the refrigerant R is supplied by the refrigerant circulation pump 5. The outlet side of the generator 1 is connected to the inlet of the ejector 2, and the high-pressure refrigerant Rh generated by heating the refrigerant R by the generator 1 is supplied.

  The nozzle portion 2a of the ejector 2 is connected to the outlet side of the refrigerant R of the evaporator 3. The negative pressure of the driving refrigerant as the driving fluid generated by reducing the pressure of the high-pressure refrigerant Rh supplied from the inlet by the nozzle portion 2a. The suction refrigerant Rs as suction fluid is sucked from the evaporator 3 by the pressure. A mixing unit 2b is provided downstream of the nozzle unit 2a, and a diffuser unit 2c is provided downstream of the mixing unit 2b. The driving refrigerant generated by being supplied from the inlet, the driving refrigerant and the suction refrigerant Rs The mixed refrigerant mixed with and flows in the order of the nozzle part 2a, the mixing part 2b, and the diffuser part 2c, and is discharged from the outlet.

  A condenser 4 is connected to the outlet of the ejector 2, and the mixed refrigerant is returned to the liquid refrigerant R by the cooling water W supplied from the outside. A suction port of the refrigerant circulation pump 5 is connected to the outlet side of the condenser 4, and the refrigerant R is supplied to the generator 1 by the refrigerant circulation pump 5. The evaporator 3 is supplied to the suction side of the refrigerant circulation pump 5 through an expansion valve 6. A part of the flow path from the outlet of the condenser 4 to the evaporator 3 is used as a large-diameter pipe portion 8 made of a pipe having a large diameter.

  In the ejector-type refrigerator according to the present invention configured as described above, the hot water Wh is supplied to the generator 1, the high-pressure refrigerant Rh generated by evaporation by heating the refrigerant R is supplied to the ejector 2, and the nozzle unit When passing through 2a, the pressure is reduced to generate a driving refrigerant. The suction refrigerant Rs generated by the evaporator 3 is supplied to the nozzle part 2a of the ejector 2, and the suction refrigerant Rs is sucked by the negative pressure generated when the driving refrigerant passes through the nozzle part 2a. Accompanying the driving refrigerant.

  The suction refrigerant Rs sucked by the nozzle part 2a of the ejector 2 is mixed with the driving refrigerant in the mixing part 2b to become a mixed refrigerant that is a mixed fluid. The mixed refrigerant is decelerated and pressurized in the diffuser section 2c on the downstream side of the mixing section 2b. This mixed refrigerant is supplied to the condenser 4, cooled by the cooling water W, and returned to the liquid refrigerant R. The refrigerant is returned to the generator 1 by the refrigerant circulation pump 5 connected to the outlet side of the condenser 4.

  A part of the refrigerant R returned by the condenser 4 is supplied to the evaporator 3 through the expansion valve 6. Since the large-diameter pipe portion 8 is installed in the middle of the flow path of the refrigerant R from the condenser 4 to the evaporator 3, the refrigerant R returned to the liquid by the condenser 4 is the large-diameter pipe portion 8. It is stored at. The stored refrigerant R is supplied to the generator 1 by the refrigerant circulation pump 5, branched on the way to the refrigerant circulation pump 5, introduced into the expansion valve 6, and supplied to the evaporator 3.

  Then, the suction refrigerant Rs is sucked from the evaporator 3 to the drive refrigerant of the ejector 2, and the water W as the target fluid supplied to the evaporator 3 is cooled by the latent heat of evaporation at that time to generate the cooling water Wc. The cooling water Wc is used for a desired application.

  Next, the ejector type refrigerator 20 according to the embodiment shown in FIG. 2 will be described. In addition, the same code | symbol is attached | subjected about the part same as the ejector-type refrigerator 10 shown in FIG. 1, and the description is abbreviate | omitted.

  In the embodiment shown in FIG. 2, the flow direction of the driving refrigerant and the mixed refrigerant in the ejector 21 is inclined downward from the horizontal direction at an appropriate angle, as shown in FIG. Further, as shown in the figure, the suction refrigerant Rs is supplied to the nozzle portion 21a obliquely from above with respect to the flow direction of the driving refrigerant. Note that a mixing unit 21b and a diffuser unit 21c successively follow the downstream side of the nozzle unit 21a.

  Further, a large-diameter pipe portion 8 is disposed on the outlet side of the condenser 4, and the liquefied refrigerant R is stored in the large-diameter pipe portion 8, and the generator 1 and the evaporator are collected by the refrigerant circulation pump 5. 3 is supplied.

  According to the ejector-type refrigerator according to the present invention, downsizing is promoted and the installation space can be reduced, so that the degree of freedom of the installation location is improved and the ejector-type refrigerator is contributed to the spread.

Wh hot water
Wc cold water
Rh High-pressure refrigerant (driving fluid)
Rs Suction refrigerant (suction fluid)
1 Generator 2 Ejector
2a Nozzle part
2b mixing section
2c Diffuser part 3 Evaporator 4 Condenser 5 Refrigerant circulation pump 6 Expansion valve 7 Receiver tank 8 Large diameter piping part
10 Ejector type refrigerator
20 Ejector type refrigerator
21 Ejector
21a Nozzle
21b mixing section
21c Diffuser section

Claims (2)

An ejector type refrigerator having an ejector that sucks a suction fluid by a driving fluid and cools the target fluid by latent heat of evaporation generated in the evaporator, and condenses the mixed fluid of the driving fluid and the suction fluid discharged from the ejector In the ejector-type refrigerator that is liquefied in a container and returned to the evaporator
An ejector-type refrigeration characterized in that a pipe of a flow path of the liquefied mixed fluid from the condenser to the evaporator is a large-diameter pipe portion having a large diameter, and the liquefied mixed fluid is stored in the large-diameter pipe portion. Machine.   The ejector type refrigerator according to claim 1, wherein the flow direction of the driving fluid and the mixed fluid in the ejector is inclined at an arbitrary angle with respect to the horizontal direction.

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