JPH09196511A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator small in the installation space, easy in assembly, and capable of correct control of the flow rate of the refrigerant. SOLUTION: A refrigerator is provided with a refrigerant evaporator comprising a compressor 2, a condenser 3, a heat-sensing expansion valve 4, and a plate type heat exchanger, a refrigerant inlet is provided in a front plate 5a of the evaporator 5, and a refrigerant outlet 5f is provided in an end plate 5b respectively, a pressure resistant container 6 to surround the refrigerant outlet 5f is integrated with the approximately circular end plate 5b, an accumulator 8 is provided, and a refrigerant circulating passage is formed by a suction pipe 9, a heat-sensing cylinder 7 is stored in a refrigerant merging passage 5e in which the refrigerant flows toward the outlet 5f, and connected by the expansion valve 4 and a pipe 7a.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an improvement of a refrigerator.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional refrigeration system. In FIG. 4, the refrigeration circuit includes a refrigerant compressor 6
0, a condenser 61, a heat-sensitive expansion valve 63, an evaporator 64, and an accumulator 65 are connected by a refrigerant conduit in a closed cycle. The accumulator 65 separates and stores the liquid refrigerant component in the refrigerant discharged from the outlet 64a of the evaporator 64, vaporizes it by the heat from the external atmosphere or the heater attached to the outer surface of the accumulator, and the liquid to the compressor 60 is stored. Prevent back phenomenon.

The heat-sensitive expansion valve 63 controls the flow rate of the refrigerant so that the degree of superheat of the refrigerant gas leaving the evaporator 64 is kept constant. For that purpose, it is necessary to accurately detect the refrigerant temperature at the evaporator outlet. Therefore, in order to detect the temperature, the temperature-sensitive cylinder 67 is attached and fixed to the upper side of the refrigerant pipe 66 connecting the evaporator outlet and the accumulator 65 and at a position as close as possible to the evaporator outlet 64a for heat insulation. The temperature sensing cylinder 67 and the expansion valve 63 are covered with each other and are connected by a capillary tube 68 to detect the refrigerant temperature near the outlet 64a, and a temperature sensing cylinder pressure corresponding to the detected temperature is applied to the diaphragm valve of the expansion valve 63. .

In such a conventional device, the refrigerant conduit 66 from the evaporator to the accumulator is absolutely necessary, and the process of connecting the refrigerant conduit 66 to the accumulator 65, which is a pressure resistant container, is time-consuming and requires a whole process. As a result, the device becomes complicated, and accordingly, the size becomes large. Further, since the temperature sensing tube is configured to contact the refrigerant through the refrigerant conduit, an error in the detection amount is likely to occur due to clever mounting, and heat is well transferred to the contact part between the temperature sensing cylinder and the refrigerant conduit. There is a problem in that it is necessary to process the surface and to attach it surely and to attach it, which requires skill in attachment.

[0005]

A first object of the present invention is to disclose a refrigerating apparatus which requires less installation space than a conventional apparatus. A second object of the present invention is to disclose a refrigeration system that is easy to assemble, does not require skill, and is relatively inexpensive to manufacture. A third object of the present invention is to disclose a refrigeration system capable of accurately controlling the refrigerant flow rate without any time lag in detecting the refrigerant temperature.

[0006]

A first gist of the present invention is to provide a refrigeration cycle in which a refrigerant compressor, a refrigerant condenser, a refrigerant expander and a refrigerant evaporator are connected by a refrigerant circulation passage, and an accumulator is used for the refrigerant evaporation. A pressure vessel that includes a refrigerant outlet opening of the container and that is integrally provided with the refrigerant evaporator,
A refrigerating apparatus, characterized in that one end is opened inside the pressure container, and the other end is constituted by a suction pipe that projects in a gas- and liquid-tight manner from the pressure container and communicates with a suction port of the compressor. .

The refrigerant evaporator may be a shell-and-tube type, a fin-and-tube type, a spiral tube type or other tubular heat exchanger, a plate-type heat exchanger, or a plate-fin-type heat exchanger that is an eclectic type of both of them. Various types such as a container can be used. A suitable heater may be provided on the outer peripheral surface of the pressure vessel forming the accumulator, if necessary. Further, the pressure vessel and the evaporator may share the member (for example, a part of the wall surface of the pressure vessel also constitutes the side surface of the evaporator) or may not share the member. However, sharing is superior in terms of saving members, reducing weight, and facilitating manufacturing.

In the refrigerating apparatus according to the first aspect, a pressure container forming an accumulator is integrally formed on the surface of the evaporator, on which the refrigerant outlet is opened, with the evaporator being gas- and liquid-tight. Since the refrigerant outlet of the evaporator is directly opened in the pressure vessel, it is not necessary to provide a refrigerant conduit for communicating the refrigerant outlet of the evaporator and the accumulator, which has been conventionally required, and the apparatus can be downsized and simple. It will be easier to assemble, and the manufacturing cost will be reduced. It also requires less installation space.

According to a second aspect of the present invention, in the refrigerating apparatus defined in the above first aspect, the refrigerant evaporator comprises a plate heat exchanger, and the plate heat exchanger comprises:
A refrigerant inlet opening to the front plate of the heat exchanger, a refrigerant distribution passage continuing to the refrigerant inlet, a refrigerant passage adjacent to the cooled fluid passage through the heat exchange plate, and the refrigerant passage merge. A refrigerant outlet opening to the end plate of the plate-type heat exchanger is provided at the end of the confluent flow passage, and a pressure container is provided with a gas, a liquid from the end face plate and the end face plate. A refrigerating apparatus characterized in that the refrigerating apparatus is configured by a pressure-resistant container that is extended while being kept dense.

Since the plate heat exchanger has high heat exchange efficiency, it is easy to downsize the evaporator, and the accumulator integrally formed with the plate heat exchanger can balance the sizes of the two, so that there is a great sense of unity. Further, reduction in size and weight of the refrigeration system and space saving are further achieved. Furthermore, if a plate heat exchanger formed of a substantially circular heat exchange plate is adopted as the plate heat exchanger, the refrigerant outlet can be opened in the circular end face plate of the plate heat exchanger, If a cylindrical container (a cylinder whose one side is closed) is extended from the peripheral edge of the end face plate while maintaining air and liquid tightness, a pressure container can be formed very easily, and the end face plate of the evaporator is an accumulator. Since it also serves as the wall surface of, the size and weight can be further reduced.

According to a third aspect of the present invention, in the refrigerating apparatus defined in the above second aspect, as a refrigerant flow rate controller for controlling the amount of the refrigerant flowing to the refrigerant evaporator, a temperature sensitive cylinder and a pressure of the temperature sensitive cylinder are used. A heat-sensitive expansion valve that operates is provided, and the temperature-sensitive tube is installed by being inserted into the refrigerant confluence flow path of the plate heat exchanger.

In the refrigerating apparatus according to the third aspect, since the temperature-sensing cylinder is directly inserted into the refrigerant confluent passage which is the passage of the refrigerant which has completed the heat exchange and is directed to the refrigerant outlet, the temperature of the refrigerant conduit is Unlike the conventional case in which the temperature was measured, directly and directly in contact with the refrigerant near the evaporator outlet, accurately and quickly,
The refrigerant temperature can be caught, and the detected amount can be transmitted to the expansion valve, which further improves the control accuracy. The location of the temperature-sensitive tube is not limited to the confluent flow path of the heat exchanger, and the temperature-sensitive tube may be provided, for example, in a state of facing the refrigerant outlet opening in the accumulator. Of course, in that case, the connecting pipe connecting the temperature sensing cylinder and the expansion valve needs to pass the pressure vessel constituting the accumulator gas-liquid tightly.

[0013]

1 and 2 schematically show a first embodiment embodying the present invention. The refrigeration system 1 of the present application includes a compressor 2, a condenser 3, a heat-sensitive expansion valve 4, and an evaporator 5.
The accumulator 8 is connected to and communicates with each other via a refrigerant conduit so as to form a refrigerant circulation flow path. The evaporator 5 is composed of a plate-type heat exchanger, and includes a large number of heat exchange plates 50, 50, ... Between a substantially circular front plate 5a and an end plate 5b of the same shape. As shown in FIG. 2, the heat exchange plate 50 has substantially elliptical openings (52 to 52) at four locations near the peripheral edge of a circular corrugated plate provided by press molding a large number of herringbone projections 51, 51, ....
55) is provided.

In the heat exchanger 5, such heat exchange plates 50 are brazed by contacting each other in such a manner that the directions of the herringbone pattern alternate with each other and the heat exchange plates 50 are adjacent to each other. Heat exchange channels are formed between the plates. The opening 53 communicates with a refrigerant inlet 5c opening at the lower part of the front plate 5a, and the refrigerant entering from the refrigerant inlet 5c is diverted to each refrigerant flow passage (heat exchange flow passage) formed between the heat exchange plates. The diversion flow path 5d is configured.
In addition, the opening 52 flows from the flow dividing flow passage 5d into each of the refrigerant flow passages to exchange heat with a fluid to be cooled, such as water or air, which is adjacent via the heat exchange plate, and then joins again.
Becomes At the end of the confluence channel 5e on the end face plate 5b side, a refrigerant outlet 5f formed in the upper part of the end face plate 5b is exposed.

On the other hand, in FIG. 2, openings 52 and 53,
Similarly, the openings 55 and 54 provided symmetrically with respect to the vertical diameter of the heat exchange plate 50 are connected to the cooled fluid passages formed adjacent to the above-mentioned refrigerant passages, respectively. And a confluence channel (54) for the cooled fluid that has passed through the cooled fluid channel. The diverting flow channel (55) and the merging flow channel (54) respectively correspond to the ends of these two flow channels and are provided on the front plate 5a, and have inlets (not shown) for the fluid to be cooled and It communicates with an outlet (not shown).

Reference numeral 7 denotes a temperature-sensitive tube which is provided by being inserted into the confluent channel 5e. Inside the temperature-sensitive tube, the airtight and liquid-tightness is maintained from the upper part of the front plate, and the temperature-sensitive tube projects outside the evaporator. It communicates with the upper space of the diaphragm in the expansion valve 4 through the tube 7a.

By extending the cylindrical portion 6b formed by closing one side by the end plate portion 6a integrally with the end face plate 5b of the evaporator 5 as described above, the end face plate 5b is extended.
A pressure vessel 6 is formed, and the pressure vessel 6 and the end face plate 5b constitute an accumulator 8 composed of a pressure vessel having a refrigerant outlet 5f opened on the side surface of the evaporator. In the upper space of the accumulator 8, the suction pipe 9
Has one end 9a opened, the suction pipe 9 penetrates the pressure container in a gas- and liquid-tight manner (6c) and projects outside the pressure container, and the other end communicates with the suction port of the compressor 2. .

In the refrigeration system 1, the expansion valve 4 to the evaporator 5 are used.
The refrigerant that has entered the shunt flow path 5d exchanges heat with the fluid to be cooled adjacent to both sides via the heat exchange plate 50 while rising in the refrigerant flow path, and in the merging flow path 5e, the surroundings of the temperature-sensitive cylinder 7 It flows and enters the accumulator 8 from the refrigerant outlet.
Since the temperature-sensitive cylinder 7 is in direct contact with the vaporized refrigerant immediately after heat exchange, the temperature of the refrigerant can be detected promptly, there is no time lag in the operation of the thermal expansion valve 4, and the control accuracy of the refrigerant flow rate is further improved.

FIG. 3 shows a second refrigerating apparatus according to the present invention.
2 shows a main part of the embodiment. 20 is an evaporator 20 of the refrigeration system according to the second embodiment, and an accumulator 2
8 is shown. An inlet 21c of the refrigerant evaporation pipe 22 is provided in the lower portion of the side plate 21a on one side of the cylindrical hermetic container 21, and the evaporation pipe 22 gas-liquid-tightly enters the container 21 from the inlet 21c. After meandering inside 21, the end portion 22a of the evaporation pipe is opened in a gas- and liquid-tight manner from the refrigerant outlet opening 21d formed in the side plate 21b at the upper portion of the side plate 21b on the other side.

A pressure vessel 26 is provided surrounding the opening of the refrigerant evaporation pipe and extending integrally from the peripheral edge of the side plate 21b to form a closed pressure container. An accumulator 28 is formed by providing a suction pipe 29 that connects the air above the closed container to a compressor (not shown) so as to penetrate the pressure resistant container 26. Reference numeral 23a is an inlet for the fluid to be cooled, 23b is an outlet thereof, and 24, 24, ... Are baffle plates that meander the fluid to be cooled and also serve as heat transfer fins. Further, reference numeral 25 denotes a temperature-sensitive cylinder fixed in the accumulator 28 so as to face the refrigerant outlet opening 21, and the detected temperature of the temperature-sensitive cylinder is a communication pipe 25a penetrating the accumulator 28 to a thermosensitive expansion valve (not shown). Added through.

[0021]

[Effects] In the above-described refrigeration system of the present application, since the evaporator and the accumulator are integrally configured, there is no refrigerant conduit connecting them, the shape is downsized and simplified, the piping labor is saved, and the installation space is small. Complete. Further, in the case where the evaporator has a substantially circular side surface, the accumulator can be extremely easily integrated with the member forming the circular side surface and the circular container. In particular, when a plate-type heat exchanger having a circular heat exchange plate is adopted as the evaporator, in FIG. 2, the fluid flowing into and out of the openings 52 to 54 and the heat exchange flow path is There are no corners where the fluid tends to stagnate, and the fluid flows through the arc-shaped portions 52a, 53a, 54
Guided by a and 55a, it flows in all directions from the opening,
It is possible to prevent the flow from becoming stagnant and the dirt from accumulating and depositing on the surface of the heat exchange plate to deteriorate the performance of the evaporator. Since the temperature sensitive tube directly detects the refrigerant temperature, the accuracy of flow rate control is improved.

[Brief description of drawings]

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

FIG. 2 is an explanatory view showing an example of heat exchange play of the evaporator shown in FIG.

FIG. 3 is an explanatory diagram showing a main part of another embodiment of a refrigerating apparatus according to the present invention.

FIG. 4 is an explanatory diagram showing an example of a conventional technique.

[Explanation of symbols]

 2 Refrigerant compressor 3 Refrigerant condenser 4 Thermal expansion valve 5 Evaporator 5a Front plate 5b End face plate 5d Refrigerant diversion flow path 5e Refrigerant confluence flow path 7 Temperature sensing tube 8 Accumulator 9 Intake pipe 50 Heat exchange plate

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location F25B 43/00 F25B 43/00 C 49/02 510 510/02 / 510B

Claims (4)

[Claims] 1. A refrigeration cycle comprising a refrigerant compressor, a refrigerant condenser, a refrigerant expander and a refrigerant evaporator connected by a refrigerant circulation flow path, wherein an accumulator includes a refrigerant outlet opening of the refrigerant evaporator and It is composed of a pressure container integrally provided with the refrigerant evaporator, and a suction pipe having one end opened inside the pressure container and the other end protruding from the pressure container and communicating with the suction port of the compressor. A refrigerating device characterized by the above. 2. A refrigerant evaporator comprises a plate-type heat exchanger, wherein the plate-type heat exchanger has a refrigerant inlet opening to a front plate of the heat exchanger and a refrigerant diverting flow path following the refrigerant inlet. And a refrigerant passage adjacent to the fluid to be cooled via the heat exchange plate, a refrigerant merging passage where the refrigerant passage merges, and an end face plate of the plate heat exchanger at an end of the merging passage. The refrigerant outlet opening to the, and the pressure vessel,
The refrigerating apparatus according to claim 1, wherein the refrigeration apparatus comprises the end face plate and a pressure-resistant container extending from the end face plate in a gas- and liquid-tight manner. 3. A refrigerant evaporator comprises a plate-type heat exchanger formed by a heat exchange plate having a substantially circular shape, and the refrigerant outlet is opened at one end face plate having a substantially circular shape of the plate type heat exchanger. The refrigeration apparatus according to claim 2, wherein the pressure vessel is constituted by the end face plate and a cylindrical container extending from the end face plate in a gas- and liquid-tight manner. 4. A temperature sensitive tube and a heat-sensitive expansion valve that operates by the pressure of the temperature sensitive tube are provided as a refrigerant flow rate controller to the refrigerant evaporator, and the temperature sensitive tube is a plate heat exchanger. The refrigerating apparatus according to claim 2 or 3, wherein the refrigerating apparatus is provided by being inserted into the refrigerant merging passage.