JP2014035136A - Showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-stage type refrigerant circuit capable of reducing its size and cost by reducing a size of a circuit used in air-cooling by water-cooling a low stage-side discharged refrigerant by drain water recovered from a machine body, and then air-cooling the same by a condenser.SOLUTION: As a compressor 11 constituting a refrigeration device 10, a two-stage compressor including a low stage-side compressing portion 11a and a high stage-side compressing portion 11b is used, and in a two-stage compression type refrigerant circuit, an outlet side of the low stage-side compressing portion 11a of the compressor 11 is connected to a condenser 2, one side of outlet sides of the condenser 2 is connected to a cooler 12, an outlet side of the cooler 12 is connected to an inflow side of the low stage-side compressing portion 11a of the compressor 11, the other side of the outlet side of the condenser 2 is connected to a suction side of the high stage-side compressing portion 11b of the compressor 11, and a discharge side of the high stage-side compressing portion 11b of the compressor 11 is connected to an inflow-side of the condenser 2. A discharged refrigerant of the low stage-side compressing portion 11a is water-cooled by drain water recovered from the machine body, and the air-cooled by the condenser.

Description

  The present invention relates to a showcase provided with a two-stage compressor having two compression elements.

As shown in FIG. 4, an open type vertical freezing / refrigerating showcase installed in a store such as a supermarket, as shown in FIG. 4, has a machine room 3 formed in the lower part of the showcase body 1. A refrigeration unit composed of a condenser 2 and a compressor is disposed inside, and the product stored in the product storage 1a is cooled by cold air cooled by a cooler installed on the back side of the showcase body. The cold air is circulated. Reference numeral 8 denotes a showcase controller.
JP 2007-333281 A

In such a showcase, as an apparatus for treating drain water such as defrost water from a cooler installed in the showcase body 1, for example, as shown in the following patent document, a lower part of the showcase body that stores and displays products A drain water evaporating device 9 for forcibly evaporating the drain water is installed in the machine chamber 3 formed in the above.
Japanese Utility Model Publication No. 5-59180 Japanese Utility Model Publication No. 2-24272

  This drain water evaporation device 9 is disposed in the machine chamber 3 at a position below a drain pipe connected to a drain port formed at the bottom of the showcase body 1, and is an evaporation pan (drain pan) for storing drain water. An evaporation plate 7 in which a large number of sheets are arranged in parallel as an evaporating material is disposed in 4.

  On the other hand, as described above, a compressor, a condenser 2, and a blower 6 are installed as cooling units in the machine room 3, and hot air that has passed through the condenser 2 and the like is applied to the evaporation plate 7 by the blower 6. Thus, the drain water contained in the evaporation plate 7 is forcibly evaporated using exhaust heat.

  In the figure, reference numeral 5 denotes a water level detection sensor for detecting whether the drain water is full. A float type sensor is used, the water level detection sensor 5 is installed in the evaporating dish 4, and the fluctuation of the water surface is measured.

  By the way, it is considered that the freezing / refrigerating showcase is the showcase main body 1 and that the two-stage compressor is used as the compressor of the refrigeration unit to efficiently perform the refrigerating room and the freezing room.

  FIG. 3 shows a two-stage compression refrigerant circuit. In the figure, 11 is a compressor constituting the refrigeration apparatus 10, 2 is a condenser, 12 is a cooler, and the compressor 11 is a low-stage compression unit (one-stage compression unit) ) 11a, a two-stage compressor provided with a high-stage compression section (two-stage compression) 11b.

  The outlet side of the low-stage compression section (one-stage compression) 11a of the compressor 11 is connected to the inflow side of the condenser 2 via the pipe 13 and flows into the condenser 2, where it is radiated and condensed, and then condensed. It flows out of the vessel 2 and is divided.

  One side of the outlet side of the condenser 2 is connected to the cooler 12 via the pipe 15, and the refrigerant flows into the cooler 12 and evaporates. At this time, by taking heat away from the surroundings, the cooler 12 exhibits a cooling action, and the inside of the showcase commodity cabinet is cooled to a predetermined temperature.

  The outlet side of the cooler 12 is connected to the inflow side of the low-stage compression section (one-stage compression) 11a of the compressor 11, and is compressed to an intermediate pressure by the low-stage compression section (one-stage compression) 11a of the compressor 11. Then, it enters the condenser 2 and is air-cooled.

  The other outlet side of the condenser 2 is connected to the suction side of the high-stage compression section (two-stage compression) 11 b of the compressor 11, and the discharge of the high-stage compression section (two-stage compression) 11 b of the compressor 11. The side is connected to the inflow side of the condenser 2 via a pipe 16.

  And it flows in into the low stage compression part (1 stage compression) 11a of the compressor 11 from the cooler 12, is compressed to intermediate pressure, enters the condenser 2, and is air-cooled.

  The other outlet side of the condenser 2 is connected to a suction pipe of a high-stage compression section (first-stage compression) 11b of the compressor 11 via a pipe 14, and is compressed (two-stage compression) there. Flows into the condenser 2 from the discharge pipe through the pipe 16.

  In this way, the low-pressure refrigerant is compressed to an intermediate pressure by the compressor 11 and enters the condenser 2 and is air-cooled. After that, it returns to the compressor again and is further compressed and discharged to the refrigeration cycle.

  In the conventional two-stage compression refrigerant circuit shown in FIG. 3, the low-pressure refrigerant is compressed to an intermediate pressure by a compressor, then intermediate-cooled by a condenser, returned to the compressor, and compressed to a high pressure. In that case, since the condenser requires a circuit for performing intermediate cooling of the refrigerant, the size increases and the cost also increases.

  An object of the present invention is to provide a showcase capable of reducing the size and cost of a two-stage compression refrigerant circuit.

  In order to achieve the above object, according to the present invention, the compressor constituting the refrigeration apparatus uses a two-stage compressor including a low-stage side compression unit and a high-stage side compression unit, and the low-stage compressor. The outlet side of the side compressor is connected to the condenser, one of the outlet sides of the condenser is connected to the cooler, and the outlet side of the cooler is connected to the inflow side of the lower stage compressor of the compressor. In the two-stage compression refrigerant circuit, the other of the outlet side of the compressor is connected to the suction side of the high-stage compression section of the compressor, and the discharge side of the high-stage compression section of the compressor is connected to the inflow side of the condenser. The refrigerant discharged from the stage-side compression section is cooled with water using the drain water collected from the fuselage main body, and then air-cooled with a condenser, and the refrigerant discharged from the lower-stage compression section is allowed to pass through an evaporating dish that stores drain water. Is a summary.

  According to the first aspect of the present invention, in the two-stage compression refrigerant circuit, the low-stage discharge refrigerant is water-cooled with drain water collected from the fuselage main body and then air-cooled with a condenser, thereby promoting water-cooling heat transfer. The condenser can be reduced, energy can be saved by reducing the compression work on the high stage side, and a florist cycle (energy saving) can be realized by recovering latent heat.

  According to the second aspect of the present invention, in order to cool the discharged refrigerant of the low-stage compression section with the drain water collected from the main body, efficient cooling is achieved by passing the inside of the evaporating dish for storing the drain water. And the evaporation of the drain water by heat exchange with the drain water can be promoted.

  As described above, the showcase of the present invention is used for air cooling in a two-stage compression refrigerant circuit by cooling the low-stage-side discharge refrigerant with drain water collected from the airframe body and then air-cooling with a condenser. The circuit can be reduced, and the size and cost can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an example of a two-stage compression refrigerant circuit of a showcase according to the present invention. The same components as those in FIG. 3 showing the conventional example are given the same reference numerals.

  Of the showcases to which the present invention is applied, the open type vertical showcase is the same as described with reference to FIG.

  In FIG. 1, reference numeral 9 denotes a drain water evaporation device, as shown in FIG. 4, which is located below the drain pipe connected to the drain port formed at the bottom of the showcase body 1, as shown in FIG. 4. In the evaporating plate (drain pan) 4 for storing drain water, an evaporating plate 7 in which a large number of sheets are arranged in parallel is disposed in the evaporating plate (drain pan) 4. The hot air passing through the condenser 2 and the like is evaporated by the blower 6. The drain water applied to the plate 7 and thus contained in the evaporation plate 7 is forcibly evaporated using exhaust heat.

  Of the compressor 11, the condenser 2, and the cooler 12 constituting the refrigeration apparatus 10, the compressor 11 includes a low-stage compression section (one-stage compression) 11 a and a high-stage compression section (two-stage compression) 11 b. It is a two-stage compressor.

  The outlet side of the low-stage compression section (one-stage compression) 11a of the compressor 11 is connected to the inflow side of the condenser 2 via the pipe 13 and flows into the condenser 2, where it is radiated and condensed, and then condensed. In the present invention, the drain water evaporation device 9 is interposed between the outlet side of the low-stage compression section (one-stage compression) 11 a of the compressor 11 and the condenser 2. I let you.

  One side of the outlet side of the condenser 2 is connected to the cooler 12 via the pipe 15, and the refrigerant flows into the cooler 12 and evaporates. At this time, by taking heat away from the surroundings, the cooler 12 exhibits a cooling action, and the inside of the showcase commodity cabinet is cooled to a predetermined temperature.

  The outlet side of the cooler 12 is connected to the inflow side of the low-stage compression section (one-stage compression) 11a of the compressor 11, and is compressed to an intermediate pressure by the low-stage compression section (one-stage compression) 11a of the compressor 11. The water enters the condenser 2 through the drain water evaporator 9 and is cooled by air.

  The other outlet side of the condenser 2 is connected to the suction side of the high-stage compression section (two-stage compression) 11 b of the compressor 11, and the discharge of the high-stage compression section (two-stage compression) 11 b of the compressor 11. The side is connected to the inflow side of the condenser 2 via a pipe 16.

  In this way, the low-pressure refrigerant is compressed to an intermediate pressure by the compressor 11 and enters the condenser 2 and is air-cooled. After that, it returns to the compressor again, and is further compressed and discharged to the refrigeration cycle. The present invention is the same as the conventional example. However, in the present invention, after the low-pressure refrigerant is compressed to the intermediate pressure by the compressor 11, the compressor 11 The refrigerant that has been discharged to the outside is recovered from the main body, cooled with drain water accumulated in the drain water evaporator 9, then enters the condenser 2, is air-cooled, returns to the compressor 11, and is compressed to a high pressure. It was made to discharge to the refrigerant cycle.

  FIG. 2 is a perspective view of the drain water evaporator 9 showing an example of this. The outlet side of the low-stage compression section (one-stage compression) 11 a of the compressor 11 is connected to the inflow side of the condenser 2 via a pipe 13. However, the pipe 13 was allowed to pass through the evaporating dish 4 in which drain water was stored.

  The drain water evaporation device 9 is provided with an evaporation plate 7 in which a large number of sheets are arranged in parallel as an evaporation material in an evaporation dish (drain pan) 4 for storing drain water, and an evaporating cloth 20 made of a nonwoven fabric is laid thereon. As shown in FIG. 4, a float type water level detection sensor 5 is provided.

  As another embodiment, the piping 13 is allowed to pass through the evaporation plate 7, or a watering device such as a pump is attached to pump up drain water in the evaporation dish 4, and this is supplied to the piping 13. You may make it water.

  In the two-stage compression refrigerant circuit, the low-stage-side refrigerant discharged from the low-stage-side compression section (one-stage compression) 11a of the compressor 11 is water-cooled with drain water and then air-cooled with the condenser 2. It is also possible to promote drain water evaporation by heat exchange.

It is a two-stage compression refrigerant circuit diagram of the showcase of the present invention. It is a perspective view of the drainage evaporator of the showcase of the present invention. It is a circuit diagram which shows a prior art example. It is a perspective view of an open showcase.

DESCRIPTION OF SYMBOLS 1 ... Showcase main body 1a ... Goods storage 2 ... Condenser 3 ... Machine room 4 ... Evaporating dish 5 ... Water level detection sensor 6 ... Blower 7 ... Evaporating plate 8 ... Showcase controller 9 ... Drain water evaporation device 10 ... Refrigeration device 11 ... Compressor 11a ... Lower stage compression section (1-stage compression)
11b: High-stage compression section (two-stage compression) 12 ... Coolers 13, 14, 15, 16 ... Pipe 20 ... Evaporating cloth

Claims (2)

The compressor constituting the refrigeration system uses a two-stage compressor having a low-stage compression section and a high-stage compression section, and the outlet side of the low-stage compression section of the compressor is connected to a condenser. One side of the outlet side of the compressor is connected to the cooler, the outlet side of the cooler is connected to the inflow side of the low-stage compressor portion of the compressor, and the other outlet side of the condenser is the high-stage side compressor portion of the compressor. In the two-stage compression refrigerant circuit connected to the suction side, the discharge side of the high-stage compression section of the compressor is connected to the inflow side to the condenser,
The showcase is characterized in that the refrigerant discharged from the low-stage compression section is water-cooled with drain water collected from the main body and then air-cooled with a condenser.   The showcase according to claim 1, wherein the refrigerant discharged from the low-stage compression section is allowed to pass through an evaporating dish for storing drain water.

Images