JPH0861795A - Multistage refrigerator and multistage refrigerating method - Google Patents

Abstract

PURPOSE: To obtain a multistage refrigerator and a method for refrigerating in a multistage in which power consumption in the daytime, at night, etc., can be leveled and further the power consumption can be largely reduced. CONSTITUTION: The multistage refrigerator comprises a plurality of compressors 20, 21 arranged in series, a cooling refrigerant tube 29 supplying the part of refrigerant as cooling refrigerant of an intermediate cooler 23 via a switching valve 27 to the refrigerant tube 26 of a refrigerating cycle having the cooler 23, a second condenser 30 provided between the valve and the intermediate cooler, expansion means 32 for cold thermal storage material cooler and cold thermal storage material cooler 33 arranged at a refrigerant tube, a cold thermal storage material cooling tube 34, a supply tube 37 for introducing cold thermal storage material into the second condenser provided between the cooler and the second condenser, a return tube 38 for introducing the material to the cooler, and cold thermal storage material feeding tube having a cold thermal storage material pump 39 for feeding the material.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multistage refrigerating apparatus and a multistage refrigerating method used for cooling a refrigerating warehouse or the like having a relatively low temperature.

[0002]

2. Description of the Related Art Generally, when a refrigerating apparatus in which a compressor, a condenser, an expanding means for an evaporator and an evaporator are sequentially connected by a refrigerant pipe is used to obtain a refrigerating atmosphere of -30.degree. Since the compression ratio in the compressor increases and the compression efficiency, volumetric efficiency, etc. decrease, the temperature of the refrigerant at the compressor outlet rises and the lubricating oil etc. of the compressor deteriorates and is unsuitable. In order to obtain such a low temperature refrigerating atmosphere, a multi-stage refrigerating device is used in which the compressors are arranged in two or three stages and the plurality of compressors compress the refrigerant stepwise. ing.
FIG. 10 shows a conventional multistage refrigeration system of this type. This multi-stage refrigeration system has a condenser 3 sequentially arranged downstream of a low-pressure side compressor 1 and a high-pressure side compressor 2 which are arranged in series.
The intercooler 4, the expansion valve 5, and the evaporator 6 are connected by a refrigerant pipe 7, and the condenser 3 of the refrigerant pipe 7 is
A cooling refrigerant pipe provided with an auxiliary expansion valve 9 for supplying a part of the refrigerant on the downstream side of the condenser 3 as a cooling refrigerant for the intercooler 4 to the outlet side of 10
Is provided, and the outlet side of the intercooler 4 of the cooling refrigerant pipe 10 is connected to the refrigerant pipe 7 on the inlet side of the high-pressure side compressor 2.

In the conventional multi-stage refrigerating apparatus having such a structure, the two stages of the low-pressure side compressor 1 and the high-pressure side compressor 2 compress the refrigerant stepwise to prevent a decrease in compression efficiency and the like. , A part of the refrigerant cooled by the condenser 3 is guided from the cooling refrigerant pipe 10 to the intercooler 4 via the auxiliary expansion valve 9, and after cooling the refrigerant, the refrigerant on the inlet side of the high-pressure side compressor 2 is further cooled. The refrigerant cooled in the intercooler 4 is isoenthalpic-changed by the expansion valve 5 to lower the pressure by merging with and cooling the refrigerant to vaporize it in the evaporator 6 on the downstream side. By doing so, for example, the air (medium to be cooled) in the freezer warehouse is cooled.

[0004]

However, in the conventional multistage refrigeration system described above, two compressors are used even when the refrigeration load is extremely low such as at night when the multistage refrigeration system is used in a refrigerating warehouse. Since it is necessary to operate 1 and 2 at a low output with low operation efficiency, it is uneconomical, and when the refrigeration load disappears, all the compressors 1 and 2 are stopped. On the other hand, when the refrigeration load increases during the daytime, the two compressors 1 and 2 are operated at high output, which causes a problem that the power consumption during the daytime and nighttime is greatly deviated. In addition, when the refrigerant is cooled by the intercooler 4, a part of the refrigerant downstream of the condenser 3 is used, so that the amount of the refrigerant actually contributing to vaporization and cooling in the evaporator 6 is small. From this point of view, there is a problem that the refrigerating effect is low and it is not economical.

The present invention has been made to effectively solve the problems of the conventional multi-stage refrigeration system described above. It is possible to equalize the power consumption during daytime and nighttime, and also to significantly reduce the power consumption. It is an object of the present invention to provide a multi-stage refrigerating device and a multi-stage refrigerating method that can be reduced in number.

[0006]

A multi-stage refrigerating apparatus according to the present invention as set forth in claim 1 is provided with a condenser, an intercooler, and an evaporator, which are sequentially provided downstream of a plurality of compressors arranged in series. The expansion means for a vessel and the evaporator are connected by a refrigerant pipe, and at the outlet side of the condenser of the refrigerant pipe, a part of the refrigerant on the downstream side of the condenser is cooled by an intercooler via a switching valve. A cooling refrigerant pipe having auxiliary expansion means for supplying it as a refrigerant for cooling is provided, and the outlet side of the intercooler of the cooling refrigerant pipe is connected to the refrigerant pipe on the inlet side of the compressor on the high pressure side. In the device, a second condenser is provided between the switching valve and the intercooler or between the intercooler and the evaporator expansion means, and the upstream end of the refrigerant pipe is intermediate via the switching valve. It is connected to the outlet side of the cooler, and cools down sequentially toward the downstream side. An expansion means for a cooler and a cool storage material cooler are provided, and a pipe for cooling the cool storage material having a downstream end connected to the outlet side of the evaporator is provided, and a cool storage material cooler and a second condenser are provided. In between, a supply pipe for guiding the cold storage material stored in the cool storage material cooler into the second condenser, a return pipe for guiding the cool storage material in the second condenser to the cool storage material cooler, and transferring the cool storage material A regenerator material transfer pipe having a regenerator material pump is provided.

Further, in the multistage refrigerating apparatus according to the present invention as set forth in claim 2, the condenser, the intercooler, and the expanding means for the evaporator are sequentially provided on the downstream side of the plurality of compressors arranged in series. , And the evaporator is connected by a refrigerant pipe,
On the outlet side of the condenser of the refrigerant pipe, there is provided a cooling refrigerant pipe having auxiliary expansion means for supplying a part of the refrigerant on the downstream side of the condenser as a cooling refrigerant for the intercooler via a switching valve. , The intercooler outlet side of this cooling refrigerant pipe,
In the multi-stage refrigeration system connected to the refrigerant pipe on the inlet side of the high-pressure side compressor, between the switching valve and the intercooler,
Alternatively, a second condenser is provided between the intercooler and the evaporator expansion means, and a heat exchanger for cooling the refrigerant is provided at the inlet side of the high-pressure side compressor, and the upstream side of the refrigerant pipe is provided. The side end portion is connected to the outlet side of the intercooler via the switching valve, the expansion means for the regenerator material cooler and the regenerator material cooler are sequentially arranged toward the downstream side, and the downstream side end portion is the evaporator. Is provided with a pipe for cooling the regenerator material connected to the outlet side of the regenerator, and the regenerator material cooled by the regenerator material is second condensed between the regenerator material cooler and the second condenser and heat exchanger. A supply pipe leading to the inside of the reactor, a heat exchanger introduction pipe for supplying the regenerator material discharged from the second condenser as a refrigerant of the heat exchanger, and a regenerator material discharged from the heat exchanger as a regenerator material. Cooling material transfer arrangement having a return pipe returning to the cooler and a cold storage material pump for transferring the cold storage material The is characterized in that provided.

Further, the multistage refrigerating apparatus according to claim 3 is
A first temperature detecting means for detecting the temperature of the refrigerant is provided on the inlet side of the evaporator expanding means according to claim 1 or 2, and the temperature detected by the first temperature detecting means or the temperature in the evaporator is detected. It is characterized by comprising a control means for controlling the discharge flow rate of the regenerator pump based on the temperature of the cooling medium.

On the other hand, in the multistage refrigerating apparatus according to claim 4, the second temperature detecting means for detecting the temperature of the refrigerant is provided on the outlet side of the second condenser according to claim 1 or 2. And a control means for controlling the discharge flow rate of the regenerator pump based on the temperature detected by the second temperature detection means.

Further, a multistage refrigerating apparatus according to a fifth aspect is provided with an opening / closing valve in the cooling refrigerant pipe according to any one of the first to fourth aspects, wherein an inlet side of the evaporator expanding means is provided.
First temperature detecting means for detecting the temperature of the refrigerant is provided, and based on the temperature detected by the first temperature detecting means or the temperature of the medium to be cooled in the evaporator, the discharge flow rate of the regenerator pump and the opening / closing valve A control means for controlling the degree of opening / closing is provided.

The multistage refrigerating apparatus according to claim 6 is characterized in that at least one of the inlet and outlet of the second condenser and the inlet and outlet of the intercooler of the refrigerant pipe according to any one of claims 1 to 5 is provided. It is characterized in that a bypass pipe for the refrigerant is provided through an on-off valve. Here, the multistage refrigerating apparatus according to claim 7 is characterized in that the cool storage material pump according to any one of claims 1 to 6 is provided in a return pipe of the cool storage material transfer pipe. .

Further, the multistage refrigerating apparatus according to claim 8 is
The regenerator cooler according to any one of claims 1 to 7,
A heat exchange tank for exchanging heat with the cold storage material by inserting the cold storage material cooling pipe, a cool storage tank to which at least the supply pipe is connected, and a heat storage tank and a cool storage tank connected between the internal The multistage refrigerating device according to claim 9 further comprises a connecting pipe for circulating the regenerator material, wherein the regenerator cooler according to any one of claims 1 to 8 is the regenerator material cooling. The storage pipe is inserted through the pipe for heat exchange with the cold storage material, and the cold storage tank to which the supply pipe is connected and the cold storage material connected to the cold storage tank via the connection pipe and the return pipe It is characterized by comprising a recovery tank.

In the multistage refrigerating device according to any one of claims 1 to 9, the invention according to claim 10 is a fluid for producing a solid material as the regenerator material during regenerator storage in a regenerator cooler. The present invention as set forth in claim 11 is, as the regenerator material, 5 to 60.
A mixture of 1 wt% or more of water and 1% or more of an organic compound having a carbonyl group or a hydroxyl group, a melting point of −15 ° C. or less, and a carbon number of 1 to 5 is used, and at least the second It is characterized in that the flow means for the regenerator material is provided in the condenser. The invention according to claim 12 is characterized in that one kind of the organic compound in the regenerator material according to claim 11 is acetone.

Next, in the multistage refrigerating method according to the present invention as set forth in claim 13, a condenser, an intercooler, and an evaporator expansion means are provided in sequence downstream of a plurality of compressors arranged in series. And the evaporator is connected by a refrigerant pipe,
On the outlet side of the condenser of the refrigerant pipe, there is provided a cooling refrigerant pipe having auxiliary expansion means for supplying a part of the refrigerant on the downstream side of the condenser as a cooling refrigerant for the intercooler via a switching valve. , The intercooler outlet side of this cooling refrigerant pipe,
The second condenser was connected to the refrigerant pipe on the inlet side of the high-pressure side compressor, and was further provided between the switching valve and the intercooler or between the intercooler and the expansion means for the evaporator. The multistage refrigeration system is used to cool the regenerator material by cooling it with at least a part of the refrigerant that has passed through the intercooler when the load is low, and when the normal load operation is performed, the regenerator material is cooled to the second stage.
By supplying the cooling medium to the condenser to cool the cooling medium, the flow rate of the cooling medium to the intercooler is reduced.

Further, in the multistage refrigerating method according to a fourteenth aspect, a condenser, an intercooler, an evaporator expansion means, and an evaporator are sequentially provided on the downstream side of a plurality of compressors arranged in series. Is connected by a refrigerant pipe, the outlet side of the condenser of the refrigerant pipe, auxiliary expansion means for supplying a part of the refrigerant on the downstream side of the condenser as a cooling refrigerant for the intercooler via a switching valve A cooling refrigerant pipe having is provided, the intercooler outlet side of the cooling refrigerant pipe is connected to the refrigerant pipe on the inlet side of the high-pressure side compressor, and further between the switching valve and the intercooler. A multi-stage refrigeration system in which a second condenser is provided between the intermediate cooler and the evaporator expansion means, and a heat exchanger for cooling the refrigerant is provided at the inlet side of the high-pressure side compressor. Use the cooler that has gone through the above intercooler when the load is low. The cold storage material is cooled by at least a part thereof to supply the cold storage material to the second condenser during the normal load operation, and the refrigerant discharged from the second condenser is further supplied to the heat exchanger. And cooling the refrigerant by supplying the cooling refrigerant to the intermediate cooler to reduce the flow rate of the cooling refrigerant.

[0016]

According to the inventions of claims 1 and 13, when the load is low or there is no load, the regenerator material is cooled by a part or almost all of the refrigerant passing through the intercooler. , During normal load operation, by supplying the above-mentioned cold storage material that has been cold stored to the second condenser to cool the refrigerant, the flow rate of the cooling refrigerant to the intercooler is reduced,
Although it becomes possible to increase the flow rate of the refrigerant supplied to the evaporator, and thus the power consumption at low load at night, etc. will increase somewhat, during normal load operation, the evaporator will be substantially frozen compared to the conventional one. Since the flow rate of the contributing refrigerant can be greatly increased, the power consumption during the normal load operation can be significantly reduced, and as a result, the power consumption can be leveled during the day and night, and the power consumption can be reduced. Are planned together. In particular, if a refrigerant pipe on the inlet side of the compressor on the high-pressure side is separately provided with a heat exchanger having a cooling medium such as cold water for cooling the refrigerant at the location, the intercooler can be used at all. Instead, it becomes possible to maintain the operating state during normal load operation, so that the above-described operational effects become more prominent.

In addition, in the multi-stage refrigeration system according to the first aspect, the second condenser using the regenerator material is selected by appropriately selecting the material of the regenerator material, the capacity of the regenerator material cooler, and the like. If the refrigerant is set to be in a supercooled state by cooling, the refrigeration effect in the refrigeration cycle can be further enhanced, the power consumption of the compressor can be further reduced, and the followability to a larger load change can be improved. To do. Further, even an existing multi-stage refrigeration system can be easily modified into one having the configuration according to the present invention without replacing the expansion means, the condenser, the evaporator, or the like.

Further, in the inventions according to claims 2 and 14, the regenerator material, which has been used for cooling the refrigerant in the second condenser, is further sent to the heat exchanger so that the high pressure side compressor Since it is reused as a refrigerant for cooling the refrigerant at the inlet, in addition to the function and effect of the invention described in claims 1 and 13, it is possible to further use the regenerator material up to a high temperature, Depending on the set temperature, the refrigerant introduced from the intercooler through the cooling refrigerant pipe is not required, so that operation without using the intercooler is possible, and as a result, a larger amount of refrigerant is sent to the evaporator, which is substantially effective. Since it is possible to contribute to such cooling, it is possible to further improve the capacity of the refrigeration cycle.

In this case, according to the invention described in claim 3, the control means controls the temperature of the refrigerant on the inlet side of the expansion means by the first temperature detecting means or the temperature of the medium to be cooled in the evaporator. By controlling the discharge flow rate of the cold storage material pump so as to be maintained at a predetermined temperature, the flow rate of the cooling refrigerant to the intercooler is reduced, and the flow rate of the refrigerant supplied to the evaporator is increased. Is held stable.

Further, in the invention described in claim 1 or 2, when the second condenser is provided between the switching valve and the intercooler, the refrigerant temperature in the first temperature detecting means is 2 It is affected by cooling by the condenser and cooling by the intercooler. Therefore, if the control means controls the discharge flow rate of the regenerator pump based on the refrigerant temperature on the outlet side of the second condenser as in the invention described in claim 4, the cool storage directly in the second condenser is achieved. Since it is possible to control the flow rate of the cold storage material pump while confirming the cooling effect of the cold storage material, it is particularly suitable for use in controlling the flow rate of the cold storage material in an operating state in which sufficient cooling of the refrigerant is possible only by the second condenser.

Further, according to the multistage refrigerating apparatus of the fifth aspect, the control means controls the discharge of the regenerator pump based on the temperature detected by the first temperature detecting means or the temperature of the medium to be cooled in the evaporator. Since the flow rate and the opening / closing degree of the on / off valve of the cooling refrigerant pipe are controlled, if the temperature of the regenerator material is sufficiently low, the on / off valve must be sufficient to reduce the inlet refrigerant temperature of the high pressure side compressor. It is closed to the minimum refrigerant flow rate, and the operation state in which the refrigerant is cooled by only the second condenser is maintained by the flow rate control of the regenerator pump. Further, when the temperature of the regenerator material rises and the temperature detected by the first temperature detecting means or the like does not drop to a predetermined temperature only by controlling the flow rate of the regenerator material pump, the on-off valve is gradually opened to the intermediate position. Cooling by the refrigerant in the cooler is performed.

By the way, when the temperature of the cold storage material rises and the cooling in the second condenser is not sufficiently performed, or because the temperature of the cold storage material is sufficiently low, the cooling of the refrigerant in the intercooler is unnecessary. In such a case, since the heat exchange passage of the medium in the second condenser or the intercooler is long, the heat radiation amount of the refrigerant in the heat exchange passage becomes large. In this respect, according to the invention as set forth in claim 6, the refrigerant bypass pipe is provided via an opening / closing valve in at least one of the inlet and outlet of the second condenser and the inlet and outlet of the intercooler of the refrigerant pipe. Therefore, when the second condenser is not used, the refrigerant is passed through the bypass pipe side of the second condenser,
On the other hand, when cooling in the intercooler is unnecessary, by passing the refrigerant through the bypass pipe side of the intercooler, the heat dissipation loss is prevented and the flow path resistance of the refrigerant is further reduced. The power of the compressor can be reduced.

Further, according to the invention of claim 7, the viscosity of the regenerator material becomes lower at a high temperature after heat dissipation, which facilitates transfer by the regenerator material pump, and as a result, the regenerator material pump described above. It is possible to reduce the driving force. Particularly, in the cool storage material according to the invention described in claims 10 to 12 to be described later, the cool storage material is in a slurry state before heat dissipation in the second condenser, whereas it is liquid after heat dissipation. Therefore, the transfer becomes easier.

Next, according to the invention of claim 8,
When the cold storage material is cooled, since the cold storage material is circulated between the heat exchange tank and the cold storage tank, it is not necessary to provide a stirrer or the like in the heat exchange tank or the cold storage tank, and therefore, in particular as described below. It is suitable when the regenerator material described in 10 to 12 is used.
In general, in order to increase the heat exchange rate in the heat exchanger, it is necessary to increase the flow velocity of the medium near the heat transfer surface in the heat exchanger. For this reason, if the cool storage material cooler becomes large and its capacity becomes large, it becomes difficult to secure a large flow velocity of the cool storage material. However, in the invention according to the present claim, since the cool storage material cooler has a configuration including a heat exchange tank and a cold storage tank, when a stirrer is provided in the heat exchange tank and the cold storage tank, Claims 1 to 1 above
It is not necessary to uniformly flow the entire amount of the regenerator material in the regenerator material cooler as in the invention described in 7, and it is possible to rapidly agitate the regenerator material in the heat exchange tank and maintain a high flow rate. On the other hand, in the cold storage tank, the cold storage material may be gently stirred. As a result, the heat exchange speed can be easily increased in the heat exchange tank, and the internal temperature distribution can be made uniform in the cold storage tank. Further, particularly when the cool storage material according to any one of claims 10 to 12 is used, the sedimentation of the slurry can be prevented.

Further, according to the invention of claim 9,
When using the regenerator material in the daytime or the like, without returning the regenerator material between the regenerator material cooler and the second condenser, use only the regenerator material in the regenerator tank to which the supply pipe is connected to return. By returning to the cold storage material recovery tank, it becomes possible to always use the cold storage material having a constant temperature as the cooling medium in the second condenser, and the refrigeration cycle is stabilized as a whole.
The cool storage material returned to the cool storage material recovery tank is supplied to the cool storage tank at night or the like to be cooled, and is supplied to the second condenser or the like from the cool storage tank during the next daytime and used.

By the way, the inventors of the present invention previously disclosed in Japanese Patent Laid-Open No.
We proposed a water-containing cold storage material, which is most suitable for this type of cold storage material, as seen in No. 281593. As described in claim 10, the cold storage material is a fluid that produces solid matter during cold storage in the cool storage material cooler, and more specifically, as described in claim 11, 5 to 60 wt. % Water and one or more organic compounds having a carbonyl group or a hydroxyl group, a melting point of −15 ° C. or less, and a carbon number of 1 to 5 and, in addition, a water-soluble organic compound It contains a compound or an inorganic compound. Such a regenerator material is usually used at a rotational speed of 1 in a cooling tank equipped with an agitator.
By rotating to -15 ° C or lower while rotating and stirring at 0 to 1500 rpm, solid particles containing water having an average particle diameter of 3.0 mm or less are produced, and as a result, the cold storage material is used as a solid-liquid dispersion to put it in a cold storage state. Since it can be converted, it has an advantage that it has a large cooling capacity and can be transferred as a slurry because the cold storage state is a solid-liquid dispersion.

Therefore, as described in claim 10 or 11, if the cold storage material is used as the cold storage material in the invention according to any one of claims 1 to 9, the cold storage temperature is low and the cold storage capacity is large. Therefore, the second condenser can be downsized, and a sufficient cooling effect can be obtained even when the flow rate of the regenerator material is small, so that the regenerator pump can be downsized and the power consumption can be reduced.

[0028] In addition, as described in claim 12, when acetone is selected as one of the organic compounds in the invention described in claim 11, the obtained regenerator material is compared with, for example, methanol, It is more suitable as this type of regenerator material because it has the property that it does not easily adhere to the heat transfer surface.

[0029]

Embodiment 1 FIG. 1 shows a first embodiment of a multi-stage refrigerating apparatus of the present invention. This multi-stage refrigerating apparatus is arranged downstream of a low pressure side compressor 20 and a high pressure side compressor 21 arranged in series. On the side, a condenser 22, an intercooler 23, an expansion valve (expansion means for evaporator) 24, and an evaporator 25 are sequentially connected by a refrigerant pipe 26, and the refrigerant pipe 26 has an outlet side of the condenser 22. In addition, an auxiliary expansion valve (auxiliary expansion means) 28 for supplying a part of the refrigerant on the downstream side of the condenser 22 as a refrigerant for cooling the intercooler 23 via the three-way switching valve 27 is provided for cooling. A refrigerant pipe 29 is provided, and the outlet side of the intercooler 23 of the cooling refrigerant pipe 29 is connected to the high pressure side compressor 2
1 is connected to the refrigerant pipe 26 on the inlet side. A second condenser 30 is provided between the three-way switching valve 27 and the intercooler 23. Further, an upstream end of the refrigerant pipe 26 is connected to an outlet side of the intercooler 23 via a switching valve 31, and an expansion valve (expansion means for cool storage material cooler) 32 is sequentially directed toward a downstream side, A cold storage material cooling pipe 33 is provided, and a downstream end portion of the cold storage material cooling pipe 33 is connected to the outlet side of the evaporator 25. A switching valve 35 is provided on the inlet side of the expansion valve 24. Further, inside the second condenser 30 and the cool storage material cooler 33, a stirrer (flowing means) (not shown) for stirring the cool storage material 36 therein is disposed.

Then, between the cool storage material cooler 33 and the second condenser 30, the cool storage material 36 stored in the cool storage material cooler 33 is introduced into the second condenser 30 as its cooling medium. A cold storage that includes a pipe 37, a return pipe 38 that guides the cold storage material in the second condenser 30 to the cold storage material cooler 33, and a cold storage material pump 39 that is interposed in the supply pipe 37 and transfers the cold storage material 36. Material transfer piping is provided. Further, on the inlet side of the expansion valve 24, a first temperature sensing cylinder (first temperature detecting means) 40 for detecting the temperature of the refrigerant at the location is provided, and the first temperature sensing cylinder 40 is provided. Control means (not shown) is provided for controlling the discharge flow rate of the cold storage material pump 39 based on the detected temperature. On the other hand, on the outlet side of the evaporator 25, there is provided a temperature sensor 41 for detecting the refrigerant temperature at the location and adjusting the degree of opening / closing of the expansion valve 24, and further, the cold storage of the cold storage material cooling pipe 34. A temperature sensor 42 for adjusting the opening / closing degree of the expansion valve 32 is provided on the outlet side of the material cooler 33.

In the cool storage material cooler 33, as the cool storage material 36, a fluid in the form of a slurry that produces solid matter during cold storage in the cool storage material cooler 33 and can be transferred by the cool storage material pump 39. , More specifically, 5
A mixture of 60% by weight of water and one or more organic compounds having a carbonyl group or a hydroxyl group, a melting point of -15 ° C or less, and a carbon number of 1 to 5, and further, a water-soluble organic compound A water-containing regenerator material containing a compound or an inorganic compound is enclosed. Here, specifically, the cold storage material 36 is obtained by mixing 40% by weight of water and 60% by weight of acetone, a mixture of 50% by weight of water and 50% by weight of acetone, or water. A mixture of 30% by weight and 70% by weight of methyl ethyl ketone,
Further, those obtained by mixing 40% by weight of water, 15% by weight of methanol and 45% by weight of acetone are used.

Next, the operation of the multi-stage refrigerating apparatus having the above-mentioned structure and an embodiment of the multi-stage refrigerating method of the present invention will be described. First, when the load is low at night or the like, the refrigerant cooled by the condenser 22 is sent to the intercooler 23 and a part of the refrigerant is cooled via the three-way switching valve 27 as indicated by the solid arrow in the figure. The refrigerant is sent to the refrigerant pipe 29, decompressed by the auxiliary expansion valve 28, sent to the inside of the intercooler 23 as a cooling medium for the intercooler 23, and the above refrigerant is cooled. The refrigerant used for cooling in the intercooler 23 is
The refrigerant on the inlet side of the high-pressure side compressor 21 joins and cools it.

On the other hand, a part of the refrigerant cooled in the intercooler 23 is sent to the evaporator 25 through the expansion valve 24 from the switching valve 35 opened by the opening corresponding to the refrigeration load.
Here, it vaporizes and performs the required freezing. In parallel with this, most of the refrigerant is sent from the switching valve 31 that is almost fully opened to the cold storage material cooling pipe 34 side, and is decompressed by the expansion valve 32 to be stored inside the cool storage material cooler 33. To cool. Then, the regenerator material 36 contains water having an average particle diameter of 3.0 mm or less by being cooled to −15 ° C. or less in the regenerator material cooler 33 while being normally agitated at a rotational speed of 10 to 1500 rpm. Solid particles are generated, and as a result, the cold storage material is converted to a cold storage state in a state in which it can be transferred as a solid-liquid dispersion (slurry).

Next, during normal load operation such as daytime, as shown by the dotted arrow in the figure, the switching valve 31 is closed and the cool storage material pump 39 is driven to cool the cool storage material that has been stored cold at night. The regenerator material 36 of the container 33 is supplied into the second condenser. As a result, the refrigerant sent from the condenser 22 is further cooled in the second condenser 30 and is sent from the expansion valve 24 to the evaporator 25 via the switching valve 35 that is almost fully opened, where it is vaporized. And refrigerate to cope with the normal load during the daytime. At this time, the control means controls the flow rate of the regenerator material 36 by the regenerator material pump 39 based on the detected temperature of the first temperature sensitive cylinder 40 which changes with the load change during operation, and the inlet temperature of the condenser 25. Is kept within the desired range. Therefore, the refrigerant on the outlet side of the condenser 22 is cooled to the desired temperature by the second condenser 30 and therefore need not be cooled in the intercooler 23. Therefore, the three-way switching valve 27 to the cooling refrigerant pipe Two
The amount of the refrigerant sent to the 9 side is limited to an extremely small amount sufficient to cool the refrigerant on the inlet side of the high pressure side compressor 21. By the way, if a heat exchanger using cooling water or the like as a cooling medium for cooling the refrigerant at the location is separately provided in the refrigerant pipe 29 on the inlet side of the high-pressure side compressor 21, the intercooler 23 can be cooled. It becomes unnecessary to send the above refrigerant.

Therefore, according to the multi-stage refrigerating apparatus and the multi-stage refrigerating method having such a structure, the cold storage material 36 is cooled by a part or almost all of the refrigerant passing through the intercooler 23 at a low load, and the normal load is applied. During operation, the cool storage material 36 that has stored cold is supplied to the second condenser 30 to cool the refrigerant at the outlet of the condenser 22, thereby decreasing the flow rate of the cooling refrigerant to the intercooler 30, Since the flow rate of the refrigerant supplied to the evaporator 25 can be increased, the flow rate of the refrigerant that substantially contributes to refrigeration in the evaporator 25 can be significantly increased during normal load operation as compared with the conventional one. The power consumption during normal load operation can be significantly reduced, and the power consumption can be leveled during the day and night and the power consumption can be reduced. In particular, if a heat exchanger using cooling water or the like as a cooling medium for cooling the refrigerant in the location is separately provided in the refrigerant pipe 29 on the inlet side of the high-pressure side compressor 21, the intercooler 23 is used at all. Since it is possible to maintain the operating state during normal load operation without
The above effect becomes more remarkable.

At this time, since the control means controls the discharge flow rate of the cold storage material pump 39 so that the refrigerant temperature in the first temperature sensing cylinder 40 is maintained at a predetermined temperature, it is possible to cope with load fluctuations. Also, the above-mentioned operating conditions can be stably maintained, and if the refrigerant is set to be in a supercooled state by cooling in the second condenser 30 using the regenerator material 36, the refrigeration cycle concerned. It is possible to further enhance the refrigerating effect in the above, further reduce the power consumption in the low pressure side compressor 20 and the high pressure side compressor 21, and improve the followability to a larger load change. Moreover, even an existing multi-stage refrigeration system can be easily modified into one having the configuration according to the present invention without replacing the expansion means, the condenser, the evaporator, or the like.

In the above multi-stage refrigeration system, the cold storage material 36 has 5 to 60% by weight of water, a carbonyl group or a hydroxyl group, a melting point of -15 ° C. or less, and a carbon number of 1 to 1.
Since the mixture with one or more kinds of the organic compound of No. 5 is used, it is possible to store cold at a temperature low enough to cool the refrigerant of the intercooler in the multistage refrigerating apparatus of this kind. At this time, since the stirrer is provided in the second condenser 30, sedimentation of the solid content of the cold storage material in the form of slurry is prevented, and the heat transfer efficiency of cold heat is improved. Moreover, since the cold storage material 36 has a large cold storage capacity,
It is possible to reduce the size of the condenser 30. Further, since a sufficient cooling effect can be obtained even when the flow rate of the cool storage material 36 is small, it is possible to reduce the size of the cool storage material pump 39 and reduce the power consumption. In particular, as a result of using a material containing acetone as the regenerator material 36, it is possible to prevent the regenerator material 36 from being deposited on the heat transfer surface of the second condenser 30 or the like.

[0038]

[Embodiment 2] FIG. 2 shows a second embodiment of the multistage refrigerating apparatus of the present invention. Like the other embodiments described later, the same components as those shown in FIG. The description is omitted. In FIG. 2, in this multistage refrigeration system, a second temperature sensing cylinder (second temperature detecting means) 43 for detecting the temperature of the refrigerant is provided on the outlet side of the second condenser 30. Control means (not shown) is provided for controlling the discharge flow rate of the cold storage material pump 39 based on the temperature detected by the second temperature sensing cylinder 43.

That is, in the multi-stage refrigerating apparatus shown in FIG. 1, the temperature of the refrigerant in the first temperature sensing cylinder 40 becomes the second temperature.
It is affected by cooling in the condenser 30 and cooling in the intercooler 23. In this respect, in the multi-stage refrigeration system of this embodiment, since the second temperature sensing cylinder 43 is provided on the outlet side of the second condenser 30, the second condenser 43 is controlled by the control means.
By controlling the discharge flow rate of the cool storage material pump 39 based on the refrigerant temperature on the outlet side of the cool storage material pump 39, the flow rate of the cool storage material pump 39 can be controlled while directly confirming the cooling effect of the cool storage material in the second condenser 30.

[0040]

[Third Embodiment] FIG. 3 shows a third embodiment of the multi-stage refrigerating apparatus of the present invention. 3, in the multistage refrigeration system of this example, a second condenser 30 is provided between the intercooler 23 and the switching valve 35, and the regenerator material supply pipe 37 is provided with the regenerator material 36. Third for detecting the temperature of
A warming tube 45 is installed. Further, an opening / closing valve 46 is provided on the outlet side of the intercooler 23 of the cooling refrigerant pipe 29, and further, based on the temperatures detected by the first temperature sensing cylinder 40 and the third temperature sensing cylinder 45. The discharge flow rate of the cold storage material pump 39 and the opening / closing valve 4 of the cooling refrigerant pipe 29
A control means 47 for controlling the opening / closing degree of No. 6 is provided.

According to the multi-stage refrigerating apparatus having such a configuration, the control means 47 causes the discharge flow rate of the cold storage material pump 39 and Since the opening / closing degree of the on-off valve 46 is controlled, when the temperature of the regenerator material 36 is sufficiently low, the on-off valve 46 has a minimum necessary amount sufficient to lower the inlet refrigerant temperature of the high pressure side compressor 21. The refrigerant is closed until the refrigerant flow rate is reached, and by controlling the cold storage material flow rate of the cold storage material pump 39 in this state, it is possible to maintain the operating state in which the refrigerant is cooled by only the second condenser 30. Further, the temperature of the regenerator material 36 rises because of the exhaustion of the regenerator material 36 and only by controlling the flow rate of the regenerator material pump 39, the refrigerant temperature in the first temperature sensing cylinder 40 drops to a predetermined temperature. If not, the on-off valve 46 is gradually opened to increase the flow rate of the refrigerant to the cooling refrigerant pipe, so that the intercooler 23 can cool the refrigerant.

[0042]

[Fourth Embodiment] FIG. 4 shows a fourth embodiment of the multi-stage refrigerating apparatus of the present invention. In the multi-stage refrigerating apparatus of this example, between the inlet and outlet of the second condenser 30 of the refrigerant pipe 26 and in the middle thereof. On-off valves 48, 49, 5 are provided between the inlet and outlet of the cooler 23, respectively.
A bypass pipe 52 of the intercooler 23 and a bypass pipe 53 of the second condenser 30 are provided via 0 and 51. Therefore, according to such a multi-stage refrigerating device, when the second condenser 30 is not used as in the cold storage or when the cold storage material is exhausted, the on-off valve 51 is closed to remove the refrigerant from the second condenser 30. Through the bypass pipe 53 side,
On the other hand, the cooling of the refrigerant is performed by the regenerator material 36 using the second condenser 30.
As in the case where it is sufficient to cool the intercooler 2,
When the cooling in 3 is unnecessary, the above-mentioned refrigerant is added to the intercooler 2
By passing the bypass pipe 52 side of No. 3, it is possible to prevent the heat radiation loss of the refrigerant in the heat transfer tube in the second condenser 30 or the intercooler 23, and further reduce the flow path resistance of the refrigerant. By doing so, the power of the compressors 20 and 21 can be reduced.

The bypass pipes 52 and 53 of the intercooler 23 and the second condenser 30 are not only those shown in FIG. 4 but also the bypass pipe 5 as shown in FIG. 5, for example.
4, 55 can also be applied. By-pass pipe 54 of such intercooler 23 and second condenser 30,
According to 55, compared with the one shown in FIG.
8 is not necessary, and thus the operation or control of these on-off valves becomes easy.

[0044]

[Embodiment 5] FIG. 6 shows a fifth embodiment of the multistage refrigerating apparatus of the present invention. In this multistage refrigerating apparatus, instead of the regenerator material cooler 33, the regenerator material cooling pipe is used. Heat exchange tank 56 in which 34 is inserted to exchange heat with the regenerator material 36
And a cold storage tank 57 to which the supply pipe 37 and the return pipe 38 are connected. And these heat exchange tanks 5
6 and the cool storage tank 57 are connected by a connecting pipe 59 provided with a circulation pump 58 for circulating the cool storage material 36.

In such a multi-stage refrigerating apparatus, when the regenerator material 36 is cooled, the circulation pump 58 is driven to connect the regenerator material 36 between the heat exchange tank 56 and the regenerator tank 57. Since it can be circulated through 59, there is an advantage that it is not necessary to provide a flow means such as an agitator in the heat exchange tank 56 or the cold storage tank 57. In addition, the heat exchange tank 56
When the stirrer is provided in the cold storage tank 57, the cool storage material cooler 3 is used as in the multi-stage refrigeration system shown in the first embodiment.
Since it is not necessary to uniformly flow the entire amount of the cool storage material 36 in the container 3, it suffices to rapidly stir the heat exchange tank 56 and slowly stir the cool storage tank 57, for example. As a result, in the heat exchange tank 56, the heat exchange rate can be increased and the cool storage tank 5 can be used.
In No. 7, settling of the slurry can be prevented and the internal temperature distribution can be made uniform. In the multi-stage refrigeration system of the present embodiment, by further applying the sixth embodiment described later, a cool storage material recovery tank is further provided in the cool storage tank 57 via a connecting pipe, and the cool storage material recovery tank is provided in this cool storage material recovery tank. It is also possible to connect the return pipe 38, which makes it possible to simultaneously achieve the operational effects of the sixth embodiment described later.

[0046]

[Sixth Embodiment] FIG. 7 shows a sixth embodiment of the multistage refrigerating apparatus of the present invention. In the multistage refrigerating apparatus of this example, instead of the regenerator material cooler 33, the regenerator material cooling pipe 34 is used. Is exchanged with the regenerator material 36 to exchange heat with the regenerator material 36 and is connected to the regenerator tank 60 to which the supply pipe 37 is connected, the regenerator tank 60 and the connection pipe 61, and the return pipe 38.
And a regenerator material recovery tank 62 connected to.

According to such a multi-stage refrigerating apparatus, the regenerator material 36 stored in the nighttime or the like is stored in the regenerator tank 60, and when the regenerator material is used in the daytime or the like, only the regenerator material 36 in the regenerator tank 60 is used. Then, the returned cold storage material 36 is recovered in the cold storage material recovery tank 62 without being circulated between the cold storage material 36 and the second condenser 30. Then, the cool storage material 36 collected in the cool storage material recovery tank 62
Are the cold storage tank 60 and the cold storage material recovery tank 6 at night.
It is supplied to the cool storage tank 60 and cooled by using a head between the two or by a pump (not shown) interposed in the connection pipe 61, and is cooled from the cool storage tank 60 to the second condenser 30 in the next daytime or the like. It is supplied and used. Therefore, according to the multi-stage refrigeration system of this example, since the regenerator material 36 having a constant temperature can always be used as the cooling medium in the second condenser 30, the refrigeration system can be further stabilized. You can

[0048]

[Seventh Embodiment] FIG. 8 shows a seventh embodiment of the multi-stage refrigerating apparatus of the present invention. 8, in the multistage refrigeration system of this example, a heat exchanger 63 for cooling the refrigerant compressed by the low pressure side compressor 20 is provided on the inlet side of the high pressure side compressor 21. . Then, between the cool storage material cooler 33 and the second condenser 30 and the heat exchanger 63, a supply pipe 64 for guiding the cool storage material 36 stored in the cool storage material cooler 33 to the second condenser 30, A heat exchanger introducing pipe 65 for supplying the regenerator material 36 discharged from the second condenser 30 as a refrigerant for the heat exchanger 63, and a heat exchanger 63.
The cold storage material 36 discharged from the cooling storage material 3 is returned to the cool storage material cooler 33 again, and the cold storage material 3 is inserted in the supply pipe 64.
A regenerator material transfer pipe having a regenerator material pump 39 for transporting 6 is provided.

Therefore, according to the multistage refrigerating apparatus of this example and the multistage refrigerating method using the same, the regenerator material 36 used for cooling the refrigerant in the second condenser 30 is further discharged to the outlet of the low pressure side compressor 20. Since it is reused as the refrigerant of the heat exchanger 63 for cooling the refrigerant in, the regenerator material 36 can be used up to a high temperature. In addition,
Depending on the set temperature, the refrigerant introduced from the intercooler 23 to the inlet side of the high-pressure side compressor 21 via the cooling refrigerant pipe 29 becomes unnecessary, so that the operation without using the intercooler 23 is possible. As a result, since all the refrigerant in the refrigerant pipe 26 can be sent to the evaporator 25 and used for substantial cooling, the capacity of the refrigeration cycle can be further improved.

[0050]

[Embodiment 8] FIG. 9 shows an eighth embodiment of the multi-stage refrigerating apparatus of the present invention. In the multi-stage refrigerating apparatus of this example, in the one shown in FIG. The regenerator material pump 39 for transferring the material 36 is provided with a return pipe 66.
Is installed in the. Therefore, according to this multi-stage refrigeration system, the temperature of the regenerator material 36 becomes higher after the heat is dissipated through the second condenser 30 and the heat exchanger 63, and as a result, the viscosity of the regenerator material 36 becomes lower. The transfer by the cool storage material pump 39 is further facilitated, and thus the driving force of the cool storage material pump 39 can be reduced.
In particular, the regenerator material 36 is in a slurry state before the heat is dissipated in the second condenser, whereas it is in a liquid state after the heat is dissipated in the heat exchanger 63, so that the transfer is further facilitated. .

In each of the above examples, the cold storage material 36 has 5 to 60% by weight of water, a carbonyl group or a hydroxyl group, a melting point of -15 ° C or less, and a carbon number of 1
A mixture with one or more organic compounds of
Furthermore, since the water-containing cold storage material made of a material containing a water-soluble organic compound or an inorganic compound is most effective, only the case of using this was explained,
It is not limited to this, and it is also possible to use an ordinary refrigerant such as water-ethylene glycol or calcium chloride solution. Further, the cool storage material cooler 33 can be filled with a rigid body in which the cool storage material is enclosed and sealed, and the above-mentioned ordinary refrigerant can be used.

In the above description of the embodiment, the cooler cooler 33 is provided with a stirrer (flow means) for stirring the cooler cooler 36 therein.
The present invention is not limited to this, and for example, when the cool storage material cooler 33 is arranged at a high place having a predetermined head and a cool storage material whose density becomes higher as the temperature becomes lower is used, The freezing effect may be further enhanced by supplying the cool storage material 36 having a lower temperature to the second condenser 30 from the bottom portion of the cool storage material cooler 33 without providing the agitator.

[0053]

As described in detail above, according to the multi-stage refrigerating apparatus and the multi-stage refrigerating method according to the present invention as defined in claims 1 and 13, during the normal load operation, the regenerator material that has regenerated at a low load is used. By cooling the refrigerant, the flow rate of the cooling refrigerant to the intercooler can be decreased, the flow rate of the refrigerant supplied to the evaporator can be increased, and the amount of the refrigerant that substantially contributes to refrigeration can be increased. Therefore, it is possible to significantly reduce the power consumption during the normal load operation, and thus it is possible to achieve the leveling of the power consumption during the day and night and the reduction of the power consumption. In particular, in the refrigerant pipe on the inlet side of the compressor on the high pressure side,
By separately providing a heat exchanger using cold water or the like for cooling the refrigerant in the location as a cooling medium, it is possible to maintain the operating state during normal load operation without using the intercooler at all. Therefore, the above effect becomes more remarkable. In addition, in the inventions according to claims 2 and 14, the regenerator material is reused for cooling the refrigerant on the inlet side of the high-pressure side compressor.
In addition to the effect of the invention described in 3, the regenerator material can be used up to a high temperature, and the operation without any intercooler can be performed. As a result, a larger amount of refrigerant can be sent to the evaporator. As a result, it is possible to substantially contribute to the cooling, so that the capacity of the refrigeration cycle can be further improved.

In this case, according to the invention described in claim 3, the operating condition can be stably maintained by the control means, and according to the invention described in claim 4, the direct second
The flow rate of the cold storage material pump can be controlled while confirming the cooling effect of the cold storage material in the condenser. Further, according to the invention described in claim 5, when the temperature of the regenerator material is sufficiently low, the on-off valve is closed and the flow rate of the regenerator material pump is controlled, so that the refrigerant is substantially provided only by the second condenser. It is possible to keep the operating state for cooling the cooling medium, and when the temperature of the regenerator material rises, open the on-off valve to cool the refrigerant in the intercooler.

Further, according to the invention of claim 6,
When the second condenser is not used, the refrigerant is passed through the bypass pipe side of the second condenser, while when the cooling by the intercooler is unnecessary, the refrigerant is passed through the bypass pipe side of the intercooler. The heat dissipation loss of the refrigerant can be prevented and the flow resistance of the refrigerant can be reduced to reduce the power of the compressor. Further, according to the invention described in claim 7, since the viscosity of the cold storage material becomes lower at the time of high temperature after heat dissipation, transfer by the cold storage material pump is facilitated, and as a result, the driving force of the cold storage material pump. Can be reduced.

Further, according to the invention described in claim 8, it is possible to obtain the effect that it is not necessary to provide a stirrer or the like in the heat exchange tank or the cold storage tank, while according to the invention described in claim 9. , Second
As the cooling medium in the condenser, it is possible to always use a cold storage material having a constant temperature, and it is possible to obtain the effect that the refrigeration cycle can be stabilized as a whole. And as described in claim 10 or 11, if the above-mentioned cool storage material is used as the cool storage material in the invention according to any one of claims 1 to 9, the second condenser can be downsized and the cool storage material can be achieved. Since a sufficient cooling effect can be obtained even when the flow rate is small, it is possible to reduce the size of the regenerator pump and reduce the power consumption. In addition, as described in claim 12, the claim 11 is described. If acetone is selected as a kind of the organic compound in the invention, the effect of preventing the regenerator material from adhering to the heat transfer surface can be obtained.

[Brief description of drawings]

FIG. 1 is a refrigerant piping system diagram showing a first embodiment of a multi-stage refrigeration system of the present invention.

FIG. 2 is a refrigerant piping system diagram showing a second embodiment of the multistage refrigeration system of the present invention.

FIG. 3 is a refrigerant piping system diagram showing a third embodiment of the multi-stage refrigeration system of the present invention.

FIG. 4 is a refrigerant piping system diagram showing a fourth embodiment of the multistage refrigeration system of the present invention.

FIG. 5 is a refrigerant piping system diagram showing a modified example of the fourth embodiment of the multistage refrigeration system of the present invention.

FIG. 6 is a refrigerant piping system diagram showing a fifth embodiment of the multi-stage refrigeration system of the present invention.

FIG. 7 is a refrigerant piping system diagram showing a sixth embodiment of the multi-stage refrigeration system of the present invention.

FIG. 8 is a refrigerant piping system diagram showing a seventh embodiment of the multi-stage refrigeration system of the present invention.

FIG. 9 is a refrigerant piping system diagram showing an eighth embodiment of the multi-stage refrigeration system of the present invention.

FIG. 10 is a refrigerant piping system diagram showing a conventional multistage refrigeration system.

[Explanation of symbols] 20 low-pressure side compressor 21 high-pressure side compressor 22 condenser 23 intercooler 24 expansion valve (expansion means for evaporator) 25 evaporator 26 refrigerant pipe 27 three-way switching valve (switching valve) 28 auxiliary expansion valve ( Auxiliary expansion means) 29 Cooling refrigerant pipe 30 Second condenser 31, 35 Switching valve 32 Expansion valve (expansion means for cool storage material cooler) 33 Cooling material cooler 34 Cooling material cooling pipe 36 Cooling material 37, 64 Supply pipe 38 , 66 return pipe 39 cold storage material pump 40 first temperature sensing tube (first temperature detecting means) 43 second temperature sensing tube (second temperature detecting means) 46 on-off valve 47 control means 48, 49, 50, 51 opening and closing Valves 52, 53, 54, 55 Bypass piping 56 Heat exchange tank 57, 60 Cool storage tank 58 Circulation pump 59 Connection piping 61 Connection pipe 62 Cold storage material recovery tank 63 Heat exchanger 65 Heat exchanger introduction pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masayoshi Hiramatsu 1-20-20 Kitakanyama, Otaka-cho, Midori-ku, Nagoya-shi, Aichi Chubu Electric Power Co., Inc. Electric Power Research Laboratory (72) Inventor Masayoshi Hirano Midori, Nagoya, Aichi 1-20, Kitakanyama, Otaka-machi, Chuo Electric Power Technology Research Institute, Chubu Electric Power Co., Inc. (72) Inventor, Kamo Kawamura 2-12-1, Tsurumi Chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Chiyoda Corporation (72) Inventor Eiji Awai 2-12-1, Tsurumi Chuo, Tsurumi-ku, Yokohama-shi, Kanagawa Chiyoda Kakoh Construction Co., Ltd. (72) Akira Kinoshita 2--12-1, Tsurumi-chuo, Tsurumi-ku, Yokohama, Kanagawa Chiyoda Kakoh Construction Co., Ltd. Within

Claims (14)

[Claims] 1. A condenser, an intercooler, an evaporator expansion means, and an evaporator are sequentially connected by a refrigerant pipe downstream of a plurality of compressors arranged in series.
On the outlet side of the condenser of the refrigerant pipe, a cooling refrigerant having auxiliary expansion means for supplying a part of the refrigerant on the downstream side of the condenser as a cooling refrigerant for the intercooler via a switching valve. Piping is provided, the intercooler outlet side of this cooling refrigerant pipe, in a multi-stage refrigeration device connected to the refrigerant pipe on the inlet side of the compressor on the high pressure side, of the switching valve and the intercooler A second condenser between the intercooler and the evaporator expansion means, and the upstream end of the refrigerant pipe is connected to the outlet of the intercooler via a switching valve. , A cool storage material cooler expansion means and a cool storage material cooler are sequentially arranged toward the downstream side, and a downstream storage end is provided with a cool storage material cooling pipe connected to the outlet side of the evaporator, and Between the cool storage material cooler and the second condenser, the above A supply pipe that guides the cool storage material stored in the cool storage material cooler into the second condenser, a return pipe that guides the cool storage material in the second condenser to the cool storage material cooler, and transfers the cool storage material. A multistage refrigerating apparatus, which is provided with a cold storage material transfer pipe having a cold storage material pump. 2. A condenser, an intercooler, an evaporator expansion means, and an evaporator are sequentially connected by a refrigerant pipe on the downstream side of a plurality of compressors arranged in series.
On the outlet side of the condenser of the refrigerant pipe, a cooling refrigerant pipe having auxiliary expansion means for supplying a part of the refrigerant on the downstream side of the condenser as a cooling medium for the intercooler via a switching valve. Is provided, the intercooler outlet side of the cooling refrigerant pipe, in a multi-stage refrigeration device connected to the refrigerant pipe on the inlet side of the compressor on the high pressure side, between the switching valve and the intercooler Alternatively, a second condenser is provided between the intercooler and the evaporator expansion means, and a heat exchanger for cooling the refrigerant is provided at the inlet side of the high-pressure side compressor, and the refrigerant is The upstream end of the pipe is connected to the outlet side of the intercooler via a switching valve, and the expansion means for the cold storage material cooler and the cold storage material cooler are sequentially arranged toward the downstream side and the downstream side. Cool storage with the end connected to the outlet side of the evaporator A pipe for cooling the material is provided,
Further, between the cool storage material cooler and the second condenser and the heat exchanger, a supply pipe for guiding the cool storage material stored in the cool storage material cooler into the second condenser, and the second condenser. Exchanger introduction pipe for supplying the regenerator material discharged from the heat exchanger as a refrigerant of the heat exchanger, a return pipe for returning the regenerator material discharged from the heat exchanger to the regenerator material cooler, and the regenerator A multi-stage refrigerating apparatus, which is provided with a cold storage material transfer pipe having a cold storage material pump for transferring materials. 3. A first temperature detecting means for detecting the temperature of the refrigerant is provided on the inlet side of the evaporator expanding means, and the temperature detected by the first temperature detecting means or the cooled medium in the evaporator is set. The multi-stage refrigerating apparatus according to claim 1 or 2, further comprising: a control unit that controls a discharge flow rate of the regenerator pump based on the temperature of. 4. A second temperature detecting means for detecting the temperature of the refrigerant is provided on the outlet side of the second condenser, and
The multistage refrigerating apparatus according to claim 1 or 2, further comprising control means for controlling a discharge flow rate of the regenerator pump based on a temperature detected by the second temperature detecting means. 5. An on-off valve is provided in the cooling refrigerant pipe, first temperature detecting means for detecting the temperature of the refrigerant is provided at the inlet side of the evaporator expanding means, and the first temperature detecting means is provided. 5. The control means for controlling the discharge flow rate of the regenerator pump and the opening / closing degree of the on-off valve based on the temperature detected by the above or the temperature of the medium to be cooled in the evaporator. The multi-stage refrigerating apparatus according to any one of claims. 6. A bypass pipe for the refrigerant is provided via an opening / closing valve in at least one of the inlet and outlet of the second condenser and the inlet and outlet of the intercooler of the refrigerant pipe. The multistage refrigerating apparatus according to any one of 1 to 5. 7. The cold storage material pump is provided in the return pipe of the cold storage material transfer pipe.
The multistage refrigerating apparatus according to any one of 1. 8. The cool storage material cooler includes a heat exchange tank in which the cool storage material cooling pipe is inserted to exchange heat with the cool storage material, and a cool storage tank to which at least the supply pipe is connected, The multistage refrigerating apparatus according to any one of claims 1 to 7, further comprising a connecting pipe connected between the exchange tank and the cold storage tank to circulate the cold storage material inside. 9. The cool storage material cooler has a cool storage tank to which the cold storage material cooling pipe is inserted for heat exchange with the cool storage material, and the supply pipe is connected to the cool storage material cooler. 9. The multi-stage refrigerating apparatus according to claim 1, further comprising a cold storage material recovery tank connected to the return pipe and connected to the return pipe. 10. The multi-stage refrigerating apparatus according to claim 1, wherein the regenerator material is a fluid that produces solid matter during regenerator storage in the regenerator cooler. 11. The regenerator material contains water in an amount of 5 to 60% by weight, a carbonyl group or a hydroxyl group, and has a melting point of −15 ° C.
It consists of a mixture with one or two or more kinds of organic compounds having a carbon number of 1 to 5 below, and at least a flow means for the regenerator material is provided in the second condenser. 10. The multistage refrigerating apparatus according to any one of 10 to 10. 12. The multi-stage refrigerating apparatus according to claim 11, wherein one of the organic compounds in the regenerator material is acetone. 13. A condenser, an intercooler, an evaporator expansion means, and an evaporator are sequentially connected by a refrigerant pipe on the downstream side of a plurality of compressors arranged in series.
On the outlet side of the condenser of the refrigerant pipe, a cooling refrigerant pipe having auxiliary expansion means for supplying a part of the refrigerant on the downstream side of the condenser as a cooling medium for the intercooler via a switching valve. Is provided, the intercooler outlet side of the cooling refrigerant pipe is connected to the refrigerant pipe on the inlet side of the compressor on the high pressure side, and further between the switching valve and the intercooler, or Using a multi-stage refrigeration system in which a second condenser is provided between the intercooler and the evaporator expansion means, and cooling the regenerator material with at least part of the refrigerant that has passed through the intercooler when the load is low. To cool the refrigerant by supplying the regenerator material to the second condenser during normal load operation, thereby reducing the flow rate of the cooling refrigerant to the intercooler. Freezing method . 14. A condenser, an intercooler, an evaporator expansion means, and an evaporator are sequentially connected by a refrigerant pipe downstream of a plurality of compressors arranged in series.
On the outlet side of the condenser of the refrigerant pipe, a cooling refrigerant pipe having auxiliary expansion means for supplying a part of the refrigerant on the downstream side of the condenser as a cooling medium for the intercooler via a switching valve. Is provided, the intercooler outlet side of the cooling refrigerant pipe is connected to the refrigerant pipe on the inlet side of the compressor on the high pressure side, and further between the switching valve and the intercooler, or A multi-stage refrigeration system in which a second condenser is provided between the intercooler and the evaporator expansion means, and a heat exchanger for cooling the refrigerant is provided on the inlet side of the high-pressure side compressor. When the load is low, the cool storage material is cooled by at least a part of the refrigerant that has passed through the intercooler, and the cool storage material is supplied to the second condenser during normal load operation. Discharge from condenser The multi-stage refrigerating method, characterized in that the flow rate of the cooling refrigerant to the intercooler is reduced by further supplying the cooled refrigerant to the heat exchanger to cool the refrigerant.