JPH1073338A - Cooler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooler which can reduce considerably the noise and vibration generated from compressors of refrigerating machines even in the case when they are installed in a part of a store. SOLUTION: A cooler 1 is constructed of a refrigerating showcase installed in a store and of a refrigerating machine for freezing and a refrigerating machine for refrigeration provided for cooling the refrigerating showcase respectively. The respective compressors 21 and 22 of the two refrigerating machines are held in a box body 2 and juxtaposed on a base 2A, while a rotary type compressor on one side and a scroll type compressor on the other which are based on systems having virtually reverse noise-vibration characteristics for a drive frequency to each other are used as the compressors 21 and 22 respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerated showcase installed in a store and a cooling device for cooling a refrigerated showcase.

[0002]

2. Description of the Related Art Conventionally, in a store such as a convenience store, a frozen showcase for displaying and storing ice cream and frozen foods and a refrigerated showcase for displaying and storing refrigerated foods such as meat and fresh fish are installed. .

A cooling unit (comprising a cooler or a blower) for a freezing refrigerator is attached to the freezing showcase, and is cooled to a predetermined freezing temperature. A cooling unit is attached and cooled to a predetermined refrigeration temperature. On the other hand, the compressors and other auxiliary equipment of each refrigerator have been separately placed in a dedicated machine room prepared specially in a building, or have been installed outdoors.

[0004]

However, due to the recent rise in land prices and the like, there has been a situation where a dedicated machine room or the like is not provided, and as a result, compressors and the like tend to be moved almost outdoors. But this time there was a problem with noise.

Further, when a compressor or the like is installed outdoors, the piping to the cooling unit of the showcase becomes long and the pressure loss increases, so that the piping diameter must be increased, and the construction cost increases. In addition, the amount of refrigerant charged must be increased.

Therefore, it is conceivable to store the compressors of the respective refrigerators in the same box and install them in a part of a store called a so-called back room or in a dead space in the store. This time, there was a problem that noise and vibration entered the store.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problems. Even when a compressor of a refrigerator is installed in a part of a store, the noise and noise generated from the compressor are reduced.
An object of the present invention is to provide a cooling device capable of significantly reducing vibration.

[0008]

The cooling device of the present invention comprises a freezing refrigerator and a freezing refrigerator for cooling a frozen showcase and a refrigerated showcase installed in a store, respectively. The compressors of the refrigerator are housed in a box, arranged side by side on the same installation surface, and the compressors used are such that the noise and vibration characteristics with respect to the drive frequency are almost opposite to each other. is there.

According to the present invention, the freezing refrigerator and the refrigerator compressor for cooling the refrigerator showcase and the refrigerator showcase installed in the store are housed in the box body. It is possible to compact the machines and install them in a part of the store.

In particular, even if the compressors are arranged side by side on the same installation surface, the compressors used are of the type in which the noise and vibration characteristics with respect to the drive frequency are substantially opposite to each other. The secondary noise such as amplification of the vibration, groaning noise, and chattering noise caused by the overlap of the vibration amplitudes can be prevented or suppressed. Therefore,
Even when the box is installed in a part of a store or the like, it is possible to effectively reduce noise and vibration entering the store.

According to a second aspect of the present invention, there is provided a refrigeration unit using a rotary compressor as a compressor for one of the refrigerating refrigerator and the refrigerating refrigerator and a compressor for the other refrigerator. It uses a scroll compressor.

FIG. 6 shows the ratio of the noise level to the drive frequency of each of the rotary, scroll and reciprocating (reciprocating) compressors, and the ratio of the vibration acceleration. As is apparent from this figure, the scroll type and the reciprocating type have the same characteristics, but the reciprocating type has higher vibration and noise. on the other hand,
The rotary type is inferior to the scroll type in terms of noise and vibration, and the characteristics are almost reversed.

FIG. 7 shows the torque change of the rotary, scroll and reciprocating gas compression loads. In the scroll type, since the compression / discharge process is performed continuously, torque fluctuation and pressure pulsation are reduced, and vibration is also reduced. Noise sources of the compressor include those caused by torque fluctuations and pulsations caused by the compression work, and opening and closing of discharge valves.
Mainly due to the compression structure of the compressor.

That is, according to the invention of claim 2, according to claim 1,
Of the refrigerating refrigerators and refrigerating refrigerators, a rotary compressor was used as a compressor for one of the refrigerators and a scroll compressor was used as a compressor for the other refrigerator. The vibration / noise characteristics with respect to the driving frequency are substantially reversed, so that the noise / vibration can be effectively reduced even when both compressors are installed side by side.

The cooling device according to a third aspect of the present invention is the cooling device according to the second aspect, wherein a rotary compressor is used as a compressor of the refrigerating refrigerator, and a scroll compressor is used as the compressor of the refrigerating refrigerator. is there.

According to the third aspect of the present invention, in addition to the second aspect, a scroll type compressor with less noise and vibration is used as a compressor of a refrigeration refrigerator for cooling a refrigerated showcase which is usually installed in a large number. Therefore, even if a compressor having a large required horsepower is adopted as the compressor, an increase in noise and vibration can be minimized.

On the other hand, since a rotary compressor is used as a compressor of a refrigerator for cooling a refrigeration showcase which is usually installed in a small number, noise and vibration can be reduced as a whole. In particular, the rotary compressor slows down so-called pull-down after defrosting and the like, but the number of times of defrosting is reduced in a freezing showcase, so that there is no problem in terms of cooling capacity.

According to a fourth aspect of the present invention, in the above-mentioned invention, the frequency at which the pipe connected to each compressor vibrates during the operation of the compressor is separated from the drive frequency of the compressor by at least 5 Hz. Things.

The vibration and noise generated during the operation of the compressor are:
In addition to the noise generated from the compressor itself, there is also noise generated by transmission of vibration to piping connected to the compressor. Further, the vibration frequency of these pipes can be adjusted by changing the weight and hardness of the pipes.

According to the fourth aspect of the present invention, in addition to the above inventions, the frequency at which the pipe connected to each compressor vibrates during operation of the compressor is separated from the drive frequency of the compressor by at least 5 Hz. As a result, the compressor and the piping connected to the compressor resonate, and the inconvenience of amplifying vibration and noise can be eliminated.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing an arrangement of a convenience store C in a store as an embodiment to which the cooling device 1 of the present invention is applied, FIG. 2 is a refrigerant circuit diagram in a box 2 of the cooling device 1 of the present invention, and FIG. FIG. 4 is a front view of the box 2, FIG. 4 is a side view of the box 2, and FIG.

In FIG. 1, a frozen showcase 4 having a glass door called a reach-in is installed on the store wall behind the entrance 3 of the convenience store C, and a refrigerator is provided with a door on the side. A showcase 6 and an open refrigerated showcase 7 are installed.

The freezing showcase 4 is provided with a cooling unit (comprising a cooler and a blower) not shown. This cooling unit is a refrigeration refrigerator 8 described later.
The inside of the freezing showcase 4 is cooled to a predetermined freezing temperature. And such a frozen showcase 4
Inside, ice cream and frozen foods are displayed and stored.

The refrigerated showcases 6, 7,... (7A,
7B (including a cooling unit and a blower), not shown. This cooling unit constitutes a refrigeration refrigerator 9 described later,
The inside of the refrigerator showcases 6, 7,... Is cooled to a predetermined refrigerator temperature. Then, refrigerated foods such as milk and sandwiches are displayed and stored in the refrigerated showcases 6, 7,.

Since the endmost refrigerated showcase 7A cannot be arranged, it is arranged with the cashier counter 11.
Reference numeral 12 denotes an office of a store, and reference numeral 13 denotes a service counter configured in the office 12. Reference numeral 14 denotes a back room, which is located at the back of each of the showcases 4, 6, 7,. Reference numeral 16 denotes a gondola shelf for displaying products that do not require cooling, and reference numeral 17 denotes a book shelf provided on the side of the entrance 3. Further, reference numeral 18 denotes a freezer built-in type freezer showcase for storing relatively inexpensive ice cream, which is installed on the opposite side of the entrance 3.

On the other hand, the refrigerating compressor 21 constituting the refrigerating refrigerator 8 comprises a relatively light rotary compressor of, for example, 3 hp, and the refrigerating compressor 22 constituting the refrigerating refrigerator 9 is relatively light. It consists of a heavy 7-horsepower scroll compressor. As shown in FIG. 2, the refrigerating compressor 21 includes a receiver tank 23 as a refrigerant liquid reservoir, an accumulator 24 for performing gas-liquid separation, a dryer 26 for removing water in the refrigerant, and a condenser (not shown) as a condenser. A well-known refrigerant circuit is constituted together with the cooler of the cooling unit. As shown in FIG. 2, the refrigerator 22 includes a receiver tank 27, an accumulator 28, and a dryer 2.
A well-known refrigerant circuit is configured together with the oil separator 31, the condenser (not shown), the cooler of the cooling unit, and the like.

Reference numeral 32 denotes a strainer for removing impurities in the refrigerant, and reference numeral 33 denotes a moisture indicator.
Reference numerals 34 and 36 denote high and low pressure switches for controlling the operation of each of the compressors 21 and 22. Reference numerals 37 and 38 denote low pressure gauges for measuring the low pressure side pressure in each refrigerant circuit. This is a high pressure gauge that measures the high pressure.

Each device shown in FIG. 2 is housed in the box 2. The box 2 is made of a steel plate, and is entirely closed. The inside of the box 2 is vertically divided by a partition plate 43, and the two compressors 21 and 22 are juxtaposed on a bottom surface 2A below the partition plate 43. Further, the partition plate 4
3 above the refrigeration compressor 21, the receiver tank 23 (27) and the accumulator 24
Auxiliary equipment such as (28) is installed.

An electric box 44 containing electric parts such as a magnet switch and a relay is attached to the uppermost part in the box 2, and a heat insulating material 46 is provided on the lower surface of the partition plate 43.
Is pasted. The plurality of refrigerant pipes 51A,..., 51B,... Connected to the compressors 21 and 22, respectively, are drawn out of the through holes 52 formed in the partition plate 43 (and the heat insulating material 46) above the partition plate 43, Are connected to connection ports 54 formed on the top surface of the box 2. And the through hole 5
The surroundings of the two refrigerant pipes 51A and 51B are sealed by a seal material 53.

The weight and hardness of the refrigerant pipes 51A and 51B are such that the frequency at which they vibrate during operation of the compressors 21 and 22 is 5 Hz higher than the drive frequency of the compressors 21 and 22. It has been selected to be more than a distance away.

In the above configuration, the box 2 is installed in an unused dead space in a corner of the store, such as between the refrigerated showcases 7A and 7B, or in the corner of the back room 14 (FIG. 1 hatched). And connection port 5
In 4..., Each device of the freezing refrigerator 8 in the box 2 is a cooling unit (cooler or expansion valve) of the freezing showcase 4.
In addition to being connected to a condenser installed outdoors and forming a well-known refrigerant circuit, each device of the refrigerator-freezer 9 is provided with a cooling unit (refrigerator) for refrigeration showcases 6 and 7 (including 7A and 7B). And an expansion valve) and a condenser installed outdoors to form a known refrigerant circuit.

The high-temperature and high-pressure gas refrigerant discharged from the refrigerating compressor 21 is condensed and liquefied by the condenser, and then returns to the receiver tank 23 and is temporarily stored therein.
Then, the pressure is reduced by the expansion valve of the freezer showcase 4 through the dryer 26 and the moisture indicator 33, and then evaporated by the cooler to exert a cooling effect. Thereby, the inside of the freezing showcase 4 is cooled to a predetermined freezing temperature.

The refrigerant leaving the cooler reaches the accumulator 24 via the strainer 32, where the unevaporated liquid refrigerant is separated, and only the gas refrigerant is sucked into the refrigeration compressor 21.

On the other hand, the high-temperature and high-pressure gas refrigerant discharged from the refrigeration compressor 22 passes through an oil separator 31 and is condensed and liquefied by the condenser.
Return to and be temporarily stored. Then, through the dryer 29 and the moisture indicator 33, the refrigerated showcases 6 and 7
After being decompressed by the expansion valve, evaporates in the cooler to exert a cooling action. Thus, the inside of the refrigerated showcases 6, 7,... Is cooled to a predetermined refrigerated temperature.

The refrigerant leaving the cooler reaches the accumulator 28 via the strainer 32, where the unevaporated liquid refrigerant is separated and only the gas refrigerant is sucked into the refrigeration compressor 22. The compressors 21 and 22 are operated with a drive frequency determined according to a cooling request from each showcase in which the compressors are responsible for cooling.

As described above, the compressors 2 of the refrigerator 8 and the refrigerator 9 for cooling the refrigerator showcase 4 and the refrigerator showcases 6, 7...
1 and 22 were housed together in the box 2, so that each compressor 2
1, 22 can be compactly installed. And since the said box 2 was installed in the unused space in a store, it becomes possible to install the compressors 21 and 22 of both refrigerators 8 and 9 effectively using the dead space in a store, Space saving can be realized. Further, since the compressors 21 and 22 are housed in the box 2, a noise reduction effect can be expected.

Further, since the freezer showcase 4 or the refrigerated showcases 6, 7, 7 and the compressors 21, 22 are closer to each other than in the conventional case, the length of the pipe connecting them can be shortened. . Therefore, it is possible to reduce the pipe diameter and reduce the amount of the charged refrigerant, thereby realizing a reduction in piping work cost and material cost.

Further, since the heavy compressors 21 and 22 are installed in the box 2 below the partition plate 43, the stability of the box 2 is improved. The accumulator 2 is placed on the partition 43.
4 and other auxiliary equipment such as the receiver tank 23 are installed, so that the installation space for the box body 2 can be reduced, and the auxiliary equipment can be installed above the lighter freezing compressor 21. Since the box 2 is installed, the weight balance of the entire box 2 becomes good, and the box 2 is further stabilized and safety is improved.

Further, the heat from the compressors 21 and 22 below the partition plate 43 is less likely to reach the auxiliary equipment such as the receiver tank 23 on the partition plate 43 due to the heat insulating material 46 on the lower surface of the partition plate 43. It is possible to reduce the inconvenience that the cooling capacity decreases due to gasification due to reheating of the liquid refrigerant.

In particular, in the present invention, even if the compressors 21 and 22 are juxtaposed on the same bottom surface 2A, the rotary compressors 21 and 22 have noise and vibration characteristics with respect to the driving frequency which are substantially opposite to each other. And the use of a scroll-type compressor prevents or suppresses secondary noises such as vibration amplification, groaning noise, and chattering noise caused by the overlap of the vibration amplitudes of both compressors 21 and 22. Will be able to do it. Therefore, even if the box 2 is installed in a part of the store,
It is possible to effectively reduce noise and vibration entering the store.

Further, since a scroll type compressor with less noise and vibration is used as the compressor 22 of the refrigeration refrigerator 9 for cooling the refrigeration showcases 6 and 7, which are usually installed in a large number, the required compressor 22 is required. Even if a large horsepower is used, it is possible to minimize the increase in noise and vibration.

On the other hand, since a rotary compressor is used as the compressor 21 of the refrigerating refrigerator 8 for cooling the refrigerating showcases 4 which are usually installed in a small number, noise and vibration can be reduced as a whole. In particular, the rotary compressor slows down so-called pull-down after defrosting and the like, but the refrigerating showcase 4 reduces the number of times of defrosting, so that there is no problem in terms of cooling capacity.

Further, the frequency at which the pipes 51A and 51B connected to the compressors 21 and 22 vibrate during the operation of the compressors 21 and 22 is separated from the drive frequency of the compressors 21 and 22 by 5 Hz or more. Therefore, the compressors 21 and 22 and the pipes 51A and 51B connected to the compressors resonate, and the inconvenience of amplifying vibration and noise can be eliminated.

In this embodiment, a scroll compressor is used as the refrigerating compressor 22. However, the present invention is not limited to this. This is effective because it is substantially opposite to the compressor 21.

[0045]

As described above in detail, according to the present invention, a freezing refrigerator for cooling a frozen showcase and a refrigerator for cooling a refrigerated showcase installed in a store, respectively, and each compressor of the refrigerated refrigerator are mounted in a box. The compressors can be compactly assembled and installed in a part of a store.

In particular, even if the compressors are arranged side by side on the same installation surface, the compressors used are of the type in which the noise and vibration characteristics with respect to the drive frequency are substantially opposite to each other. The secondary noise such as amplification of the vibration, groaning noise, and chattering noise caused by the overlap of the vibration amplitudes can be prevented or suppressed. Therefore,
Even when the box is installed in a part of a store or the like, it is possible to effectively reduce noise and vibration entering the store.

According to the second aspect of the present invention, of the refrigerating refrigerator and the refrigerating refrigerator of the first aspect, a rotary compressor is used as a compressor for one of the refrigerators and a compressor for the other refrigerator is used. Since the scroll compressor is used as the compressor, the vibration and noise characteristics with respect to the drive frequency of both compressors are almost reversed, and it is possible to effectively reduce noise and vibration even when both compressors are installed side by side. It is what becomes.

According to the third aspect of the present invention, in addition to the second aspect, a scroll type compressor with less noise and vibration is used as a compressor of a refrigeration refrigerator for cooling a refrigerated showcase which is usually installed in a large number. Therefore, even if a compressor having a large required horsepower is adopted as the compressor, an increase in noise and vibration can be minimized.

On the other hand, since a rotary compressor is used as a compressor of a freezing refrigerator for cooling a small number of refrigerator showcases, noise and vibration can be reduced as a whole. In particular, the rotary compressor slows down so-called pull-down after defrosting and the like, but the number of times of defrosting is reduced in a freezing showcase, so that there is no problem in terms of cooling capacity.

According to the invention of claim 4, in addition to the above inventions, the frequency at which the pipe connected to each compressor vibrates during the operation of the compressor is separated from the drive frequency of the compressor by 5 Hz or more. As a result, the compressor and the piping connected to the compressor resonate, and the inconvenience of amplifying vibration and noise can be eliminated.

[Brief description of the drawings]

FIG. 1 is a diagram showing an arrangement in a store of a convenience store as an embodiment to which the cooling device of the present invention is applied.

FIG. 2 is a diagram of a refrigerant circuit in a box body of the cooling device of the present invention.

FIG. 3 is a front view of the box.

FIG. 4 is a side view of the box.

FIG. 5 is a sectional view of the box.

FIG. 6 shows the ratio of the noise level to the drive frequency of each of the rotary, scroll and reciprocating (reciprocating) compressors.
It is a figure which shows the ratio of a vibration acceleration.

FIG. 7 is a diagram showing a torque change of a gas compression load of a rotary type, a scroll type, and a reciprocating type.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Box 2A Bottom surface 4 Refrigeration showcase 6, 7 Refrigeration showcase 8 Refrigeration refrigerator 9 Refrigeration refrigerator 21 Refrigeration compressor 22 Refrigeration compressor 23, 27 Receiver tank 43 Partition plate 46 Insulation material 51A , 51B refrigerant piping

Claims (4)

[Claims] 1. A refrigeration refrigerator for cooling a refrigeration showcase and a refrigeration showcase installed in a store, respectively, and a cooling device comprising a refrigeration refrigerator. A cooling device which is housed in a body, is arranged side by side on the same installation surface, and uses a compressor in which noise and vibration characteristics with respect to a driving frequency are substantially opposite to each other. 2. A rotary compressor is used as a compressor of one of a freezing refrigerator and a refrigerating refrigerator,
2. The cooling device according to claim 1, wherein a scroll compressor is used as the compressor of the other refrigerator. 3. The cooling device according to claim 2, wherein a rotary compressor is used as a compressor of the refrigerating refrigerator, and a scroll compressor is used as a compressor of the refrigerating refrigerator. 4. The compressor according to claim 1, wherein the frequency at which the piping connected to each compressor vibrates during operation of the compressor is separated from the drive frequency of the compressor by at least 5 Hz. Or the cooling device of claim 3.