JP2994902B2 - Refrigeration equipment - Google Patents

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 a desuper pipe for cooling a high-temperature high-pressure gas refrigerant discharged from a compressor and then returning the refrigerant to a compressor once to cool the compressor.

[0002]

2. Description of the Related Art Conventionally, a refrigerant having a low specific heat ratio, such as R-502, has been used in a refrigerant circuit constituting a refrigerating device of a cooling storage installed as a food freezing / refrigeration facility in a supermarket or a restaurant. In a refrigeration system using such a refrigerant, the discharge temperature of the refrigerant is relatively low, so that the temperature rise of the compressor is not a problem. However, in recent years, the specific refrigerant (R-12)
And 502 etc.) can no longer be used.

Therefore, in recent years, R-22 has been used as an alternative refrigerant.
For example, a refrigerant having a low risk of destruction of the ozone layer has been used. However, R-22 is R-50
2, there is a problem that the discharge temperature of the refrigerant rises, the temperature of the compressor rises abnormally, and the windings of the drive motor are damaged. In order to solve this, as a means for lowering the temperature of the compressor, a liquid injection method has conventionally been used, and for example, Japanese Patent Application No. 3-2 filed by the applicant earlier.
No. 72108 (F25B1 / 00) is considered to be a desuperheat system. In the liquid injection method, the refrigerant discharged from the compressor is condensed and liquefied, and a part of the condensed liquid refrigerant is returned to a low-pressure side of the compressor via a capillary tube and evaporated inside the compressor to thereby evaporate the compressor. This is suitable for the case where a relatively low temperature (for example, −40 ° C. or the like) is obtained with a cooler, but it has a drawback that it is difficult to select a capillary tube and that the structure of the compressor is complicated.

[0004] On the other hand, in the desuperheat system as described in the above-mentioned application, a high-temperature and high-pressure gas refrigerant discharged from a compressor is externally cooled by a desuperpipe, and the cooled refrigerant is returned to a rotating shaft portion of the compressor and compressed. After passing through the inside of the compressor to cool the compressor, it is discharged from the discharge side of the compressor and supplied to the subsequent cooler. According to this method, the structure of the compressor is simple and the design of the refrigerant circuit is easy. Therefore, it is often used for a refrigeration apparatus that does not require a low temperature in a cooler (for example, −10 ° C.).

FIG. 5 and FIG. 6 show a condenser 100 of a conventional refrigeration system of the desuperheat type. Condenser 100
Are tube sheets 101, 101 on both sides, and both tube sheets 101, 101
A plurality of fins 102 for heat exchange provided between the fins 102, a desuper pipe 103 and a condensing pipe 104 inserted through the fins 102 and held on both sides by tube sheets 101, 101.
It is composed of Each pipe forms three rows of pipes in the left-right direction and is inserted in a meandering manner up and down, and is connected to the outside of the tube sheets 101 and 101 by bend portions.

[0006] In addition, the inlet 105 of the
Is formed at an upper end of one side of a pipe row on the compressor side (not shown) of the condenser 100, and an outlet 106 of the desuper pipe 103 is formed on one side of a pipe row opposite to the compressor. Further, an inlet 107 of the condensing pipe 104 is formed at an upper end of one side of the central row, from which the condensing pipe 104 once reaches a compressor-side pipe row, descends therefrom in a meandering manner, and has an outlet of the condensing pipe 104. 108 is formed at the lower end of one side of the pipe row on the compressor side.

[0007]

However, according to such a conventional structure, the outlet 106 of the
Straddles the bend portion 104B of the condensing pipe 104 (the inlet and outlet of the condensing pipe straddle the bend portion of the condensing pipe in the above-mentioned application).
I have to go to the compressor through outside from 04
The installation space occupied by the condenser 100 is accordingly increased. For this reason, the condenser 100 cannot be installed in a limited space, and the width of the condenser 100 must be reduced, which causes a problem that the condensing capacity is reduced and the cooling capacity is also reduced.

Further, as shown in FIG. 7, an inlet 105 and an outlet 106 of the desuper pipe 103 are formed at the upper end and the upper and lower center of the pipe row on the compressor side, and the inlet 10 and the inlet 10 of the condenser pipe 104 are formed.
7 and the outlet 108 are also formed below the outlet 106 of the pipe row on the compressor side so as to bypass the desuper pipe 103 and arrange the condensing pipe 104, so that the bend portion 104B of the condensing pipe 104 Since there is no need to straddle, the installation space occupied by the condenser 100 can be reduced.
, The pressure must be increased and then lowered again, so that the pressure loss of the refrigerant increases, and there is a problem that the cooling capacity is reduced at this point.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and in a refrigeration apparatus having a desuper pipe, without causing a pressure loss of refrigerant.
The purpose is to reduce the installation space occupied by the condenser.

[0010]

A refrigerating apparatus according to the present invention comprises a compressor and a condenser pipe connected to a refrigerant discharge side of the compressor and inserted in a meandering manner while forming a plurality of pipe rows in the condenser. And a discharger outlet and return formed in the compressor,
A condenser pipe connected in a meandering manner to the condenser and connected between the discharger outlet and the return, supplying the high-temperature and high-pressure gas refrigerant discharged from the compressor to the condenser pipe from the condenser outlet, and returning from the condenser pipe. And discharges the refrigerant that has passed through the compressor from the discharge side to the condensing pipe.The inlet and outlet of the desuper pipe are provided between the upper and lower ends of the pipe row on the compressor side of the condenser, and the inlet and outlet of the condensing pipe are provided. The outlets are provided at the upper and lower ends of the pipe row on the compressor side of the condenser, and the condensing pipe is arranged so as to bypass the desuper pipe.

[0011]

The gas refrigerant having a high temperature and a high pressure discharged from the outlet of the compressor discharges into the pipe through the inlet of the pipe. The refrigerant that has flowed into the desuper pipe is cooled while passing through the pipe row on the compressor side, returns to the desuper return of the compressor from the outlet, and cools the inside of the compressor. Thereafter, the gas refrigerant discharged from the discharge side of the compressor flows into the condensing pipe from the inlet of the condensing pipe, and is cooled and condensed while passing through the meandering condensing pipe bypassing the desuper pipe.

At this time, since the inlet and outlet of the desuper pipe are formed between the upper and lower ends of the pipe row on the compressor side of the condenser, the inlet and outlet of the desuper pipe do not straddle the bend portion of the condensing pipe. Therefore, the installation space dedicated to the condenser can be reduced. In addition, the condensing pipe is arranged to bypass the desuper pipe, but the inlet and the outlet of the condensing pipe are formed at the upper and lower ends of the pipe row on the compressor side of the condenser, and the desuper pipe is disposed between the upper and lower ends of the pipe row. The condensing pipe does not have to rise from the inlet for said bypass. Therefore, no pressure loss of the refrigerant occurs.

[0013]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a side view of a refrigerator R of the present invention, FIG. 2 is a front view of a refrigerator 1 as an embodiment to which the refrigerator R of the present invention is applied, and FIG. 3 is a side view of a condenser 12 of the refrigerator R. 4 is a plan view of the condenser 12. In FIG. 2, a refrigerator 1 is a so-called under-counter type refrigerator installed in a kitchen such as a restaurant, and has a refrigeration unit (described later) in a storage room (not shown) whose front opening is openably closed by double doors 4 and 5. A cooler (not shown) constituting the apparatus R is provided, and the cooler is configured to maintain a predetermined refrigeration temperature in the storage room. A machine room 6 is formed on the left side of the refrigerator 1, and a refrigerating device R shown in FIG. 1 is installed in the machine room 6.

The refrigerating apparatus R includes a compressor 7, a condensing pipe 8,
A depressurizing device such as a capillary tube (not shown) and the cooler are sequentially connected in a ring shape to form a refrigerant circuit, and a desuper pipe 9 for cooling the compressor 7 is provided. Among them, the decompression device and the cooler are provided in the machine room 6.
The refrigerator 1 is installed in a refrigerator other than the above, but a blower 11 for a condenser and a so-called plate-fin type condenser 12 are further provided in the machine room 6.

Next, a specific connection relationship of the refrigeration system R will be described with reference to FIG. The compressor 7 is a rotary compressor, and is rubber-mounted with rubber 13 in the machine room 6 for absorbing vibration. The compressor 7 has a discharger outlet 14, a discharger return 16, and a refrigerant discharge side 17 formed on the upper left side at the lower part of the outer surface on the near side in FIG. 1, and further has a refrigerant suction side (not shown) formed. I have. Outlet pipe 18 connected to said super outlet 14
Is an inlet 19 of the desuper pipe 9 extending to the right side in FIG. 1 and passing through the condenser 12 provided in front of the compressor 16.
The outlet 21 of the desuper pipe 9 is connected to a return pipe 22, which is connected to the desuper return 16 of the compressor 7.

On the other hand, a discharge side pipe 23 connected to the discharge side 17 extends rightward from the compressor 7 and
The outlet 26 of the condensing pipe 8 is connected via a header 27 to the pressure reducing device (not shown). As shown in FIGS. 3 and 4, the condenser 12 includes tube sheets 31, 31 on both sides and a plurality of heat exchange fins 32 disposed between the tube sheets 31, 31.
Are inserted through these fins 32, and the tube sheets 31, 3
1 comprises the desuper pipe 9 and the condensation pipe 8. Each pipe forms three rows of pipes A, B, and C in the left-right direction, and is inserted in a meandering shape as a whole as a whole, and is connected to the outside of the tube sheets 31 by bend portions.

The inlet 19 and the outlet 21 of the desuper pipe 9 are formed on one side near the center located between the upper and lower ends of the pipe row A on the compressor 7 side of the condenser 12. The outlet 21 is at the bottom, and once heads from the inlet 19 to the other side, makes a U-turn at the bend part on the other side of the condenser 12, and then reciprocates left and right once near the center of the central pipe row B to the other side. At the bend portion, and make a U-turn, return to the pipe row A again, and head toward one side to reach the outlet 21.

On the other hand, the inlet 24 and the outlet 2 of the condensation pipe 8
6 is also formed on one side of the upper and lower ends of the pipe row A on the compressor 7 side of the condenser 12, the inlet 24 is the upper end, the outlet 26 is the lower end, and once heads from the inlet 24 to the other side, the condenser 1
2 After making a U-turn at the bend section on the other side, return to one side at the center pipe row B, go back and forth to pipe row C, and return to pipe row B, pipe row A, and pipe row A again. Returning to rows B and C, the super pipe 9 in the pipe row B
, Descends in a meandering manner at the pipe row C having a height substantially the same as the above, and similarly returns to the pipe row B, the pipe row A, the pipe rows A to B and C, and further from the pipe row C to B and A. It is disposed so as to reach the exit 26. That is, the condensation pipe 8
Are pipe rows A and B near the center in the vertical direction of the condenser 12.
Bypass the desuper pipe 9 existing in the
From the top to the outlet 26 at the lower end.

As described above, the inlet 19 of the
And the outlet 21 is formed on one side between the upper and lower ends of the pipe row A on the compressor 7 side of the condenser 12, and the inlet 24 and the outlet 26 of the condensing pipe 8 are also formed on the upper and lower ends of the pipe row A to form the Is disposed so as to bypass the bend portion, and it is not necessary for both the desuper pipe 9 and the condensing pipe 8 to straddle the bend portion of each pipe. Accordingly, the space occupied by the condenser 12 can be reduced, thereby increasing the width of the condenser 12 itself and improving the condenser capacity of the condenser 12, thereby improving the cooling capacity of the refrigerating apparatus R. Can be achieved.

Next, the operation of the refrigeration apparatus R having the above configuration will be described. In the refrigerating apparatus R, a predetermined amount of R-22 refrigerant is sealed as a refrigerant. Here, when the condenser blower 11 is operated, outside air is sucked from the grill 34 provided on the front of the machine room 6 of the refrigerator 1 and circulated into the condenser 12 and the other machine room 6. On the other hand, when the compressor 7 is started,
First, a high-temperature and high-pressure gaseous refrigerant of about + 85 ° C. is discharged from the discharger outlet 14 and flows into the discharger pipe 9 from the inlet 19.

The high-temperature and high-pressure gas refrigerant that has flowed into the desuper pipe 9 is air-cooled in the condenser 12 in the course of flowing through it right and left. Since the cooling in this case is air cooling by a part of the condenser 12, the refrigerant is not condensed yet, and the temperature is lowered from the above + 85 ° C. to about + 55 ° C. while almost or all of the refrigerant remains in a gaseous state. The gas refrigerant having a low temperature in this way exits the outlet 21 of the desuper pipe 9 and returns to the return pipe 2.
2 and returns to the desuper return 16 of the compressor 7.

The refrigerant which has returned to the compressor 7 from the desuper-return 16 flows into the rotary shaft inside the compressor 7. Here, the compressor 7 compresses the refrigerant sucked from the suction side (not shown) by a compression unit (not shown) and discharges the refrigerant at a high pressure from a desuper outlet 14. The suction side part and the other part are separated. Therefore, the desuper return 16
The low-temperature gas refrigerant that has returned to the rotating shaft portion passes through the rotating shaft due to the differential pressure and is discharged from the discharge side 17.

In the course of this passage, the compressor 7 is cooled by the sensible heat of the low-temperature gas refrigerant, so that the temperature of the compressor 7 becomes +
It will be about 90 ° C. Here, in the absence of the desuper pipe 9, the temperature of the compressor 7 rises to + 120 ° C. or higher. However, by cooling with the low-temperature return refrigerant as described above, the temperature can be reduced by about 30 ° C. Thereby, damage to the winding can be prevented.

Then, the refrigerant discharged from the discharge side 17 of the compressor 7 rises in temperature to about + 70 ° C. to cool the compressor 7 and reaches the inlet 24 from the discharge side pipe 23 and the condensing pipe 8 Flows into. The refrigerant flowing into the condensing pipe 8 flows in a meandering manner from top to bottom.
Air-cooled by the outside air circulated in 2 and about +4
The temperature is reduced to about 5 ° C. and condensed and liquefied.

At this time, the refrigerant flows from the inlet 24 of the condenser pipe 8 located at the upper end of the condenser 12 to the outlet 2 located at the lower end.
Since it flows down in a meandering shape as a whole toward 6, the pressure loss is small. Therefore, the refrigerant flows smoothly in the condensing pipe 8, so that the condensing ability is improved. The refrigerant condensed and liquefied in the condenser 12 exits from the outlet 26 of the condensing pipe 8, passes through the header 27, is decompressed by the decompression device, flows into a not-shown cooler, and evaporates there. At this time, the temperature of the cooler is about −10 ° C. The refrigerant exiting the cooler is supplied to the compressor 7 from a suction side (not shown).
, And is compressed and discharged again from the outlet port 14.

[0026]

As described above in detail, according to the present invention, the inlet and outlet of the desuper pipe are provided between the upper and lower ends of the pipe row on the compressor side of the condenser, and the inlet and outlet of the condensing pipe are located above and below the pipe row. Since it is provided at the end, the inlet and outlet of the desuper pipe do not straddle the bend of the condensing pipe. Therefore, since the installation space occupied by the condenser can be reduced, the size of the condenser itself can be increased, and thereby the cooling capacity of the refrigeration system can be improved.

The condensing pipe is arranged to bypass the desuper pipe, but the inlet and the outlet of the condensing pipe are formed at the upper and lower ends of the condenser, and the desuper pipe is located between the upper and lower ends of the pipe row. The condensing pipe does not need to rise from the inlet for the bypass. Therefore, the pressure loss of the refrigerant flowing through the condensing pipe is reduced, and the refrigerant flows smoothly, so that the cooling capacity of the refrigeration apparatus can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a refrigeration apparatus of the present invention.

FIG. 2 is a front view of the refrigerator.

FIG. 3 is a side view of the condenser of the present invention.

FIG. 4 is a plan view of the condenser of the present invention.

FIG. 5 is a side view of a conventional condenser.

FIG. 6 is a plan view of a conventional condenser.

FIG. 7 is a side view of another conventional condenser.

[Explanation of symbols]

 7 Compressor 8 Condenser pipe 9 Desuper pipe 12 Condenser 19 Inlet (Desuper pipe) 21 Outlet (Desuper pipe) 24 Inlet (Condenser pipe) 26 Outlet (Condenser pipe) R Refrigeration equipment

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25B 1/00 F25B 40/04 WPI (DIALOG)

Claims (1)

(57) [Claims] 1. A compressor, a condensing pipe connected to a refrigerant discharge side of the compressor and inserted in a meandering manner while forming a plurality of pipe rows in a condenser; a desuperper outlet formed in the compressor; A return pipe connected to the condenser and between the return port and the return port, and a high-temperature and high-pressure gas refrigerant discharged from the compressor is supplied from the discharge port to the discharge pipe. ,
In a refrigeration system that discharges refrigerant that has returned from the desuper pipe and passed through the compressor from the refrigerant discharge side to the condensing pipe, an inlet and an outlet of the desuper pipe are connected between upper and lower ends of a pipe row on the compressor side of the condenser. And an inlet and an outlet of the condensing pipe are provided at upper and lower ends of a pipe row on the compressor side of the condenser, and the condensing pipe is arranged so as to bypass the desuper pipe.