JPS63231174A - Constant-temperature cooling device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field 1 This invention relates to a constant temperature cooling device, and more specifically, for example, maintains fresh foods such as seafood such as fish and crabs, vegetables, and meat at a predetermined storage temperature. This relates to a constant temperature cooling IJ1 device such as an ice cold storage J'F that keeps cold uniformly.

[Prior Art] Generally, in a constant temperature cooling device used for cold storage management of marine products, fresh foods, etc., it is necessary to maintain a uniform temperature inside a refrigerator such as a refrigerator that stores fresh foods, etc.
It is said that maintaining the temperature below freezing will help maintain the freshness of fresh foods. Therefore, conventionally, the eighth
As shown in the figure, the evaporator, compressor, condenser, d, refrigerant solenoid valve e, expansion valve f, etc.
A refrigeration cycle system is formed by connecting with a circulation pipe 9 through Ice temperature and cold storage were carried out. In this case, as the refrigeration cycle progresses, the temperature inside the cold storage tends to drop below a predetermined temperature, so the temperature inside the cold storage is maintained within a constant temperature range while being controlled by opening and closing the cold solenoid valve e. A method was taken to do so.

[Problems to be Solved by the Invention] However, in the conventional control method, the adjustment width is ±1.
Since the temperature range was 5 to 2°C, it was not suitable for storage at ice temperature. In addition, a refrigerator with 11 controlled cooling units (specifically, a compression 11
C) must be turned ON and OFF frequently, which not only causes burn-in of the compression EL C, but also causes compression ttc.
There is a risk that the motor h may stop operating due to overheating, and it is difficult to operate the motor safely.

Furthermore, after a certain amount of cold 2J1 operation, it is necessary to perform defrosting operation to remove the harmful effects of frost that has adhered to the evaporator. It is common to defrost the windows, but
Especially when defrosting, electric heaters are kept cold for a relatively long time at 7J]
There was also the problem that the cooling function deteriorated because the cycle had to be stopped.

[Means for Solving the Problems] This invention has been made in view of the above circumstances, and in order to solve the above technical problems, it is possible to control the inside of the cold storage without stopping the operation of the controlled refrigeration fJI unit. The primary objective is to maintain the refrigerator at a uniform constant temperature within the specified ice temperature cooling temperature range, and also to shorten the defrosting operation time as much as possible to prevent a decline in the cooling function. Isothermal cooling with the second purpose of 1. I].

In other words, the first invention connects an evaporator disposed in a cold storage and a controlled cooling unit consisting of a compressor, a condenser, etc. via a circulation pipe via an expansion valve to create a refrigeration cycle. forming a flow-adjustable bypass line in the line from the compressor to the evaporator to mix a portion of the hot gas from the compressor into the refrigerant from the expansion valve; The second invention is a constant cooling IJ + neck mounting characterized by the fact that the
A main control cooling unit consisting of a compressor, a first condenser, etc. is connected to the first circulation pipe via a first expansion valve to form a main refrigerating cycle system, and the evaporator and ,
A backup refrigeration 7Jl unit consisting of a second compressor, a second condenser, etc. is connected via a second circulation pipe through a second expansion valve to form a backup refrigeration cycle system, A bypass line with an adjustable flow rate is formed in the line leading from the first compressor to the evaporator, which connects to the main refrigeration cycle system, so that a portion of the hot gas from the first compressor is transferred to the main refrigeration cycle system. The second compressor is mixed with the refrigerant from the first expansion valve, and in the backup refrigeration cycle system, the second compressor is connected to the 7A generator, the third expansion valve, and the second condenser. The present invention aims to provide a constant temperature cooling 1 (I) device characterized by forming a defrosting cycle system that can be selectively operated.

J3 in the first and second aspects of the invention, the bypass pipe contains bot gas mixed in the refrigerant flowing from the expansion valve to the evaporator. It is necessary to set up a means to adjust the temperature of However, it is preferable that the refrigerant is formed by opening/closing and flow regulating valves, and the refrigerant from the expansion valve accounts for at least 1/2 of the medium flowing from the compressor to the evaporator.
It is preferable that it is 4 or more.

Further, in the second aspect of the invention, the selection switching means may be of any type as long as it enables selection between the backup refrigeration cycle system and the defrosting cycle system as needed, but it is preferable. is formed by a four-way switching valve that selectively switches between the backup refrigeration cycle system and the defrosting cycle system, which is installed in the pipe connecting the second compressor and the second condenser. It's better.

[Effect] The above technical means works as follows.

According to the first invention, the hot gas from the compressor is gradually introduced into the refrigerant that is condensed in the condenser of the controlled cooling unit and then expanded in the expansion valve. It is possible to prevent a decrease in the evaporation temperature in the refrigeration cycle that supplies only refrigerant to the evaporator without stopping operation, and also allows
By reducing the gas flow (gas flow) to an equilibrium condition, the fluctuation range of the evaporation temperature can be made as small as possible.

Further, according to the second invention, by providing a backup refrigeration cycle system with a defrosting cycle system outside the main control cooling unit of the first invention, cooling is achieved in addition to the effect of the first invention. The action can be promoted and defrosting can be carried out in a short time.

[Embodiment 1] An embodiment of the present invention will be described below in detail based on the drawings.

◎First invention Figure 1 shows a piping diagram of a constant temperature cooling device according to the first invention. An accumulator 20 for accumulating the medium discharged from the condenser 10, a compressor 30 for compressing the medium, a condenser 40, a liquid moisturizer 24 for temporarily accumulating the medium liquefied in the condenser 40, etc.: 1) Control cold J, I
A refrigeration cycle system is formed by connecting the I unit 50 with a circulation pipe 70 via an expansion valve 60, and a flow rate adjustment valve 34 and an electromagnetic on-off valve 35 are installed in the pipe from the compressor 30 to the evaporator 10. It has a structure in which a bypass conduit 80 is formed. In addition, the temperature inside the cold storage 1 is detected by the temperature sensor 2 installed in the cold storage 1, and the signal from the temperature sensor 2 is sent to the It is designed to be sent to an electromagnetic on-off valve 35.

In the constant temperature cooling device of the present invention configured as described above, at the time of startup, the motor 31 of the compressor 30 is driven with the flow rate adjustment valve 34 and the electromagnetic on-off valve 35 closed. All of the hot gas goes to condenser 4
After being condensed by 0, the refrigerant is expanded by the expansion valve 60 and supplied to the evaporator 10, and the air inside the cold storage 1 is cooled by the evaporation action of the evaporator.

The medium discharged from the evaporator 10 is then transferred to the compressor 3 again.
After being compressed at a
When the temperature sensor 2 is cooled to -6°C), the temperature sensor 2 acts and sends the signal to the flow zero adjustment valve 34 and the electromagnetic on-off valve 35.
The electromagnetic on-off valve 35 is opened, and the flow rate adjustment valve 34 is opened by a predetermined amount. Then, a part of the hot gas from the compressor 30 passes through the bypass pipe line 80 and is mixed with the refrigerant and is supplied to the evaporator 10, so that cooling is suppressed and the flow rate regulating valve 34 is opened 1. Gradually increase the amount, and when the cold 7JJ suppression reaches the set range, fix the opening degree to keep the hot gas flow constant and mix it into the refrigerant in the evaporator 10.
When supplied to a constant temperature (±
05°C), and since a part of the hot gas from the ff: reduced printing 30 is mixed with the refrigerant from the expansion valve 60, a high humidity state (80 to 85%) can be maintained without humidification, and the cold storage It can ensure the freshness of items and reduce loss of weight due to drying. In this case, from the compressor 30 to the evaporator 10
The refrigerant from the expansion valve 60 must account for at least 1/4 of the medium flowing through the expansion valve 60. In other words, compressed PA
If the absolute amount of medium flowing from 30 to evaporator 10 is "1", then the maximum amount of hot gas is IQ, 75J, expansion valve 60
The minimum h1 is ro, 25. The state where it becomes I is the limit.

◎Second invention FIG. 2 shows a piping diagram of a constant temperature cooling device u according to the second invention.The constant temperature cooling device of this invention has two evaporators 10. The second case is a case in which a main refrigeration system having a main control cooling unit 50 and a backup refrigeration cycle system having a backup cold W unit 52 are connected, and a defrosting cycle system is also installed in the backup refrigeration cycle system. .

In this case, the main refrigerating recycle system is connected to the evaporator 10° second
a first accumulator 20 for accumulating the medium taken out one by one from the first compressor 30 for compressing the medium;
The first stage temporarily stores the liquefied medium in the compressor 30 of
The main control unit 2Il refrigerating unit 50 formed by the liquid reservoir 24 etc. of the evaporator 10. I believe this is the third structure connected to the second one. In this main cooling 7jJ19 cycle system (13C1), a bypass pipe is provided with a flow rate regulating valve 34 and an on-off valve 35 in the pipe from the first compressor 30 to the evaporator 10. 80.

In addition, the backup refrigeration cycle system described above includes the evaporator 1
0. a second accumulator 22 for accumulating the medium discharged from the second J-IE compressor 32 for compressing the medium;
and a second liquid reservoir 26'S which is connected to the second compression m32 via the refrigeration cycle check valve 14 and temporarily stores the medium liquefied by the second compressor 32. A structure in which the backup cold rJl units 1 to 52 formed in It has become. The defrosting cycle system installed alongside this backup refrigeration cycle system is the second one mentioned above.
Refrigeration cycle electromagnetic on-off valve 1G in the circulation pipe 72 of
and a first defrosting bypass pipe line 84 including a defrosting Nicle check valve 15 that is piped in parallel to the second expansion valve 62;
A second defrosting bypass pipeline 86 having a defrosting cycle expansion valve 17 (third expansion valve) and a defrosting cycle electromagnetic on-off valve 18 which are piped in parallel with the refrigeration cycle check valve 14
A four-way switching valve 90 disposed between the second compressor 32 and the second condenser 2S42 converts the hot gas from the second compressor 32 as shown by the arrow in FIG. Direct evaporator 1
0. A third defrosting bypass line 88 selectively sends the medium from the second condenser 42 to the second accumulator 22. In addition, in the backup refrigeration cycle system and the defrosting cycle system, the second expansion valve 62 and the temperature sensor 3 disposed on the supply 1 part side of the evaporator 10 of the second circulation pipe 72 are electrically connected. expansion valve 1 for the defrost cycle.
7 and the one-temperature converter 4 disposed between the four-way switching valve 90 and the second condenser 42 (see FIGS. 3 and 4).

In the constant temperature cooling N1 boiler of the present invention configured as described above, the evaporator 10. Second, a portion 11 connected to the main refrigeration cycle system is disposed on the inside, and a backup and defrosting portion 13 connected to the backup refrigeration cycle system is disposed on the outside, especially when defrosting the evaporator. 10
．． Consideration is given so that heat can be uniformly transferred to the fins (not shown) constituting the second part. Further, as shown in FIGS. 6 and 7, both evaporators 10. In the second central part there is a fan +
9.19.19 are arranged and both evaporators 10. A shielding plate 21 is disposed on the second lower side to force the air inside the cold storage to the evaporator 10. It is designed to be sent to the second. In addition, the temperature f2 in the cold storage R1 is detected by the temperature sensor 2 disposed inside the cold storage 1, and this temperature hint (
The signal from the first and second compression tJ30.32 motors 31, 31, flow rate adjustment valve 34, and electromagnetic on-off valve 35
It is now sent to

3 and 4 show the evaporator 10. FIG. 3 is a circuit diagram illustrating a backup refrigeration cycle and a defrost recycle that are connected to one of the second evaporators 10, and FIG. A case is shown in which the refrigerant is sent and works together with the refrigerant from the main control cooling unit 5o to cool the cold storage 1 with ice, and also,
In FIG. 4, the four-way switching valve 90 of the defrosting cycle system is operated to transfer hot gas from the second compressor 32 to the evaporator 10. Send it to the second evaporator 10. Second one? "Remove the frost"
This does not indicate the case in which this is the case.

In addition, in FIGS. 3 and 4, there are three-way valves 2 in the pipes between the second liquid reservoir 2G and the second expansion valve 62, respectively.
3. A dryer 25 and a sight glass 27 are provided.

In the constant temperature cooling device of the present invention configured as described above, when cooling the inside of the cold storage 1 with ice temperature UI', as shown in FIG.
Since the motors (not shown) of the first compressor 30 and the second compressor 32 run with the first compressor 30 and the second compressor 32 closed, the first
and after all of the hot gas from the second compressor 30.32 has been condensed by the first and second condensers 40.42, respectively, the first and second expansion valves 60.62 are It is expanded and becomes a refrigerant and evaporates i10. The second is fed to the evaporator 10. The air inside the cold storage 1 is cooled by the second evaporation action. And evaporator 10. After the medium discharged from the second is compressed again in the compressor 30.32,
The same heat pump cycle as above is repeated to cool the refrigerator 1.
When the temperature inside reaches a temperature 1°C higher than the predetermined temperature (approximately -4°C), the operation of the 1 unit 52 is stopped in the backup m6, and the cold storage j! When the offshore temperature of tr1 is cooled to the set temperature (for example, about -5°C to -6°C), the temperature sensor 2 acts and sends the signal to the flow rate adjustment valve 34 and the electromagnetic opening/closing valve 35, so that the electromagnetic opening/closing is performed. While opening the valve 35,
The flow rate adjustment valve 34 is opened by a predetermined amount. Then, the bypass is used, and a portion of the hot gas from the first compressor 3° passes through the bypass pipe line 8o, is mixed with the refrigerant, and is supplied to the evaporator 10, so that cooling is suppressed. In this state, the opening degree of the flow rate adjustment valve 34 is gradually increased, and when the suppression of cooling reaches the set temperature range, the opening degree is fixed, and the flow rate of the bot gas is kept constant, and the fish and shellfish are mixed with the refrigerant. 10, the temperature inside the cold storage 1 becomes a uniform constant temperature state (±0.5°C), and a part of the hot gas from the compression m30 is mixed with the refrigerant from the expansion valve 60.
It is possible to maintain a high humidity state (80 to 85%) without humidification, ensure the freshness of the refrigerated items, and reduce the loss of weight due to cooling and drying. In this case, the refrigerant from the first expansion valve 60 needs to account for at least 1/4 of the medium flowing from the first compressor 30 to the evaporator 10 . That is, if the absolute value of the medium flowing from the first pressure 116 machine 30 to the evaporator 10 is "1", the maximum amount of hot gas is "0.75", and the minimum amount of refrigerant from the first expansion valve 60 is "0.75". The limit is the state where is "0°25". In this way, the bypass usage state is maintained for a certain period of time (approximately 60 to
After the 20th minute (20 to 30 minutes in an unsteady state), the same operation as above is repeated as a cold IJ1 operation using the main control cooling unit 50 and the backup cooling unit 52 in the same way as in the starting state. The Shonai temperature of the cold storage 1 is maintained at the ice temperature cooling temperature which is the set temperature. When the refrigerator 1 is cooled to ice temperature for a certain period of time (approximately 4 hours) in this way, the evaporator 10. Since some frost forms on the second surface, only the main control cooling unit 50 is stopped after the bypass is used, and the four-way switching valve 90 of the backup refrigeration system is switched to operate the defrosting cycle system. , the hot gas from the second compressor 32 is transferred to the evaporator 10. When supplied to the second evaporator 10. Since the second has the function of a condenser, the evaporator 10. Second, adhering frost can be removed. After defrosting, the cold storage of the cold storage 1 is continued by performing the same freezing and backup refrigeration cycle as described above again.

[Effects of the Invention] As explained above, according to the constant temperature cooling device of the present invention, the evaporator disposed in the cold storage and the control cooling unit are connected by the circulation pipe via the expansion valve. A refrigeration cycle system is formed by forming a refrigeration cycle system, and a bypass pipe line that can adjust the flow rate is formed in the pipe line from the compressor to the evaporator of the controlled cooling unit, so that the following effects can be obtained.

1) Part of the hot gas from the compressor can be mixed with the refrigerant from the expansion valve, so the evaporation temperature in the refrigeration cycle that supplies only refrigerant to the evaporator without stopping the operation of the Controlled Refrigeration 2J unit. It is possible to prevent a decrease in

2) By reducing the flow rate of hot gas to a level that matches the equilibrium state at a given temperature, the fluctuation range of evaporation temperature can be made as small as possible, making it possible to preserve fresh foods such as ice-cold and chilled foods. It becomes possible.

3) Since the flow rate and cycle speed of the medium are not changed, safe operation is possible without undue influence on the cold 2Jl equipment, especially the compressor.

4) By mixing the hot gas from the compressor with the refrigerant from the evaporator, the evaporation temperature can be raised relative to the temperature inside the refrigerator, so high humidity can be maintained and the freshness of refrigerated foods can be more reliably maintained.

Further, according to the cooling device of the second invention, a backup refrigeration cycle system with a defrosting cycle system is provided outside of the main control cooling unit of the first invention, so that In addition to the advantages of the invention, the six-way action can be promoted, and defrosting can be carried out at 0 hours.

[Brief explanation of the drawing]

Figure 1 is a piping diagram of a constant temperature cooling device according to the first invention, Figure 2 is a piping diagram of a constant temperature cooling fJl equipment according to the second invention, and Figures 3 and 4 are respectively in accordance with the second invention. Poly piping diagram for backup refrigeration cycle system and defrost cycle system,
FIG. 5 is a time chart diagram for J3 in the second invention, and FIG. 6 is a bottom view showing the structure of the evaporator in the second invention.
FIG. 7 is a sectional view taken along line Vl-W in FIG. 6, and FIG. 8 is a piping diagram of a conventional cold 2Jl device. Code explanation (1)...Cold box (10, 2nd)...Evaporator (30)...(First) compression is (32)...Second compressor (34)...・Flow a adjustment valve (35)...Solenoid on-off valve (40)...(First) condenser (42)...Second condenser (50)...(Main) control cooling connit (52)...
Backup cooling unit (60)...(first)
Expansion valve (62)...Second expansion valve (70)...(First) circulation line (72)...Second circulation line (80)...Bypass line (84) )...First defrosting bypass pipe (86)...
Second defrost bypass pipe (88)...Third defrost bypass pipe (90)...Four-way switching valve patent Applicant: Agent of Nippon Light Metal Co., Ltd.
Patent Attorney Tomohiro Nakamura (2 others) Figure 5 Figure 6 ■'' 2nd

Claims (7)

[Claims] (1) A refrigeration cycle system is formed by connecting an evaporator installed in a cold storage to a controlled cooling unit consisting of a compressor, a condenser, etc. through an expansion valve, and The invention is characterized in that a bypass pipe whose flow rate can be adjusted is formed in the pipe leading from the compressor to the evaporator, so that a part of the hot gas from the compressor is mixed with the refrigerant from the expansion valve. Constant temperature cooling device. (2) The constant temperature cooling device according to claim 1, further comprising an opening/closing and flow rate regulating valve disposed in the bypass line. (3) The constant temperature cooling device according to claim 1, wherein at least 1/4 of the medium flowing from the compressor to the evaporator is refrigerant flowing from the expansion valve to the evaporator. (4) A main control cooling unit consisting of an evaporator, a first compressor, a first condenser, etc. arranged in the cold storage
A main refrigeration cycle system is formed by connecting via a first circulation pipe through an expansion valve, and a backup cooling unit consisting of the evaporator, a second compressor, a second condenser, etc. A backup refrigeration cycle system is formed by connecting via a second circulation pipe through a second expansion valve, and a flow rate is formed in the pipe from the first compressor to the evaporator in the main refrigeration cycle system. forming an adjustable bypass conduit;
A part of the hot gas from the compressor is mixed with the refrigerant from the first expansion valve, and in the backup refrigeration cycle system, the second compressor and the evaporator,
A constant temperature cooling device comprising a selectively operable defrosting cycle system connecting a third expansion valve and a second condenser. (5) The constant temperature cooling device according to claim 4, further comprising an opening/closing and flow rate regulating valve disposed in the bypass pipeline. (6) Of the medium flowing from the first compressor to the evaporator, at least 1/4 of the refrigerant flowing from the first expansion valve to the evaporator
The constant temperature cooling device according to claim 4, which includes the above. (7) A four-way switching valve that selectively switches between the backup refrigeration cycle system and the defrosting cycle system is installed in the pipeline connecting the second compressor and the second condenser. The constant temperature cooling device according to claim 4, which includes: