CN1820168A

CN1820168A - Supercooling device

Info

Publication number: CN1820168A
Application number: CNA200580000683XA
Authority: CN
Inventors: 竹上雅章; 谷本宪治; 阪江觉; 篠原巌; 近藤东
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 2004-06-11
Filing date: 2005-06-09
Publication date: 2006-08-16
Anticipated expiration: 2025-06-09
Also published as: KR20060063971A; AU2005252962A1; EP1679479A4; US20080229769A1; EP1679479A1; KR100738780B1; AU2005252962B2; WO2005121655A1; CN100375874C

Abstract

A supercooling apparatus, comprising a supercooling unit (200). In the supercooling unit, a refrigerant passage (205) is connected to the liquid side communication pipes (21, 22) of a refrigerating device (10). When a supercooling compressor (221) is operated, a supercooling refrigerant is circulated in a supercooling refrigerant circuit (220), a refrigerating cycle is performed, and the refrigerant of the refrigerating device (10) flowing in the refrigerant passage (205) is cooled. The detected values of an atmospheric temperature sensor (231) and a refrigerant temperature sensor (236) are inputted into the controller (240) of the supercooling unit (200). The controller (240) performs the operating control of the supercooling compressor (221) based on only the information obtained in the supercooling unit (200).

Description

Apparatus for supercooling

Technical field

The present invention relates to a kind of refrigerating plant, particularly improve the ability of the refrigerating plant that comprises the refrigerant loop that carries out two stage compression formula kind of refrigeration cycle and the countermeasure of reliability.

Background technology

Up to now, opening shown in the flat 10-185333 communique as for example spy, is purpose to increase cooling capacity, is installed in the refrigerating plant, and the apparatus for supercooling that cooling is delivered to the cold-producing medium that utilizes unit from the thermal source unit in refrigerating plant is well-known.

This apparatus for supercooling is installed in the air conditioner that comprises outdoor unit and indoor units.Specifically, this apparatus for supercooling is arranged in the way of hydraulic fluid side connecting pipe of outer unit of junction chamber and indoor units, simultaneously, comprises the supercooling refrigerant loop.This apparatus for supercooling circulates cold-producing medium in refrigerant loop to carry out kind of refrigeration cycle in supercooling, supercooling with the evaporimeter of refrigerant loop in the air conditioner refrigeration agent sent into from the hydraulic fluid side connecting pipe of cooling.And this apparatus for supercooling by cooling off the liquid refrigerant of delivering to indoor units from the outdoor unit of air conditioner, reduces the enthalpy of the liquid refrigerant of delivering to indoor units, improves refrigerating capacity.

But, in above-mentioned apparatus for supercooling, the control part of apparatus for supercooling and the control part of air conditioner are coupled together, constitute a control system.The signal of representing the load condition of air conditioner is input to the control part of this apparatus for supercooling from the control part of air conditioner.And, in this apparatus for supercooling, according to the control of turning round of the signal from the input of the control part of air conditioner.For example, when going out cooling load according to input-signal judging when big, the apparatus for supercooling entry into service allows the refrigerating capacity of air conditioner increase, and when judging cooling load hour, apparatus for supercooling allows running stop.That is to say that apparatus for supercooling is by adjusting refrigerating capacity rightly with the giving and accepting of signal of air conditioner.

But, in above-mentioned apparatus for supercooling in the past, have such problem: the wiring lines fortification that transmit trusted and deliver letters in order between must be arranged when being installed in this apparatus for supercooling in the refrigerating plant, thereby make apparatus for supercooling that operation is set is complicated.And, also might in connecting up fortification, this produce misroute, probably can cause accident because of such human error.

Summary of the invention

In view of the premises, the objective of the invention is to: can and the refrigerating plant of mounting object between do not carry out under the situation that signal gives and accepts, running and control apparatus for supercooling, when making operation is set oversimplifies of apparatus for supercooling, the human error when possible trouble prevents from operation is set.

The solution that the present invention proposes is as follows.

Specifically, the 1st solution is to be prerequisite with such apparatus for supercooling, be installed in and make cold-producing medium at the thermal source unit (11) that connects by connecting pipe with utilize circulation between the unit (12,13,14) to carry out to deliver to the refrigerant cools of the above-mentioned refrigerating plant (10) that utilizes unit (12,13,14) from thermal source unit (11) in the refrigerating plant (10) that steam compression type refrigerating circulates.And comprise: refrigerant passage (205) is connected on the hydraulic fluid side connecting pipe of above-mentioned refrigerating plant (10); Cooling is with fluid circuit (220), comprise allowing cold-producing medium and the cooling of above-mentioned refrigerant passage (205) with the fluid thermal exchange, with the supercooling of the refrigerant cools of above-mentioned refrigerant passage (205) with heat exchanger (210); And controller (240), adjust the refrigerant cools temperature of above-mentioned supercooling according to supercooling with the ambient conditions of heat exchanger (210) with the refrigerant passage (205) in the heat exchanger (210).

In above-mentioned solution, in the refrigerating plant that apparatus for supercooling has been installed (10), cold-producing medium by connecting pipe at thermal source unit (11) with utilize between the unit (12,13,14) contact.The refrigerant passage of this apparatus for supercooling (205) is connected on the hydraulic fluid side connecting pipe (21,22) of refrigerating plant (10), the portion's circulation within it of the cold-producing medium of refrigerating plant (10).Use in the fluid circuit (220) cooling fluid flows such as cold-producing medium, water and air in the cooling of this apparatus for supercooling.And, to use in the heat exchanger (210) in above-mentioned supercooling, the cold-producing medium that flows into the refrigerating plant (10) in the refrigerant passage (205) exchanges with fluid thermal with cooling.Use in the heat exchanger (210) in this supercooling, cooling is evaporated with the cold-producing medium heat absorption of fluid from refrigerating plant (10), and the cold-producing medium of refrigerating plant (10) is cooled.

Here, in the apparatus for supercooling of this solution, controller (240) is adjusted at the refrigerant cools temperature of the refrigerating plant (10) that flows in the refrigerant passage (205) with the ambient conditions of heat exchanger (210) according to supercooling such as outer temperature degree and refrigerant flows.For example, when temperature is spent outside supercooling is made as with the ambient conditions of heat exchanger (210), adjust the refrigerant cools temperature lower when the temperature degree is higher outside, and, adjust the refrigerant cools temperature higher when the temperature degree is low outside.That is to say,, therefore be suitable for the running control of load condition according to its ambient conditions adjustment owing to learn the load condition of refrigerating plant (10) with the ambient conditions of heat exchanger (210) according to supercooling.Therefore, under the situation of the signal of not accepting relevant load condition etc., carry out the adjustment of the cooling capacity of apparatus for supercooling from refrigerating plant (10).

And, the 2nd solution is on the basis of above-mentioned the 1st solution, above-mentioned controller (240), comprise control part (242), this control part (242) is according to predefined supercooling is adjusted in the flow of supercooling with cooling usefulness fluid mobile in the heat exchanger (210) with the cold-producing medium target chilling temperature of the refrigerant passage (205) in the heat exchanger (210) with the ambient conditions of heat exchanger (210) according to supercooling.

In above-mentioned solution, preestablish the ambient conditions with supercooling such as outer temperature degree usefulness heat exchanger (210), i.e. the cold-producing medium target chilling temperature of the corresponding refrigerating plant of load condition (10).For example, when outer temperature degree is higher, set the target chilling temperature lower, when outer temperature degree is low, set the target chilling temperature higher.And, in above-mentioned control part (242), when the target chilling temperature is low, allow supercooling increase with the flow of coolings such as cold-producing medium in the heat exchanger (210) and water with fluid.So, owing to supercooling also increases with the cold-producing medium of the refrigerating plant (10) in the heat exchanger (210) and the heat exchange amount that cools off with fluid, so the cold-producing medium of refrigerating plant (10) is further cooled.And, in above-mentioned control part (242), when the target chilling temperature is higher, allow supercooling reduce with the flow of coolings such as cold-producing medium in the heat exchanger (210) and water with fluid.So, owing to supercooling also reduces with the heat exchange amount in the heat exchanger (210), so the cold-producing medium of refrigerating plant (10) very is not cooled.

And, the 3rd solution is on the basis of above-mentioned the 2nd solution, above-mentioned cooling fluid circuit, the supercooling that is to have volume-variable is with compressor (221) and heat source side heat exchanger (222), the supercooling usefulness refrigerant loop (220) that circulates and carry out the steam compression type refrigerating circulation with cold-producing medium with the supercooling of fluid as cooling.And the control part (242) of above-mentioned controller (240) is controlled the operating frequency of above-mentioned supercooling with compressor (221) according to the target chilling temperature, is adjusted in cold-producing medium is used in above-mentioned supercooling with the supercooling of flowing in the heat exchanger (210) flow.

In above-mentioned solution, cooling constitutes supercooling refrigerant loop (220) with fluid circuit, use in the refrigerant loop (220) in this supercooling, carry out such circulation repeatedly: supercooling with compressor (221) the ejection cold-producing medium in heat source side heat exchanger (222) for example with air heat exchange, then, supercooling with heat exchanger (210) in the cold-producing medium heat exchange of refrigerant passage (205), turn back to supercooling once more with compressor (221).And, in above-mentioned control part (242), when the target chilling temperature hangs down, allow supercooling increase with the operating frequency of compressor (221), make in supercooling and use the supercooling of flowing in the heat exchanger (210) to use the flow of cold-producing medium to increase.And, in above-mentioned control part (242), when the target chilling temperature is higher, allow supercooling descend with the operating frequency of compressor (221), make in supercooling and use the supercooling of flowing in the heat exchanger (210) to use the flow of cold-producing medium to reduce.

And, the 4th solution is on the basis of above-mentioned the 2nd solution, above-mentioned cooling fluid circuit, the supercooling that is to have volume-variable is with compressor (221) and heat source side heat exchanger (222), the supercooling usefulness refrigerant loop (220) that circulates and carry out the steam compression type refrigerating circulation with cold-producing medium with the supercooling of fluid as cooling.And, the control part (242) of above-mentioned controller (240), control the operating frequency of the fan (230) of above-mentioned heat source side heat exchanger (222) according to the target chilling temperature, be adjusted in above-mentioned supercooling with the flow of the supercooling of flowing in the heat exchanger (210) with cold-producing medium.

In above-mentioned solution, use in the refrigerant loop (220) in supercooling, carry out such circulation repeatedly: supercooling with the ejection cold-producing medium of compressor (221) in heat source side heat exchanger (222) with the air heat exchange that is taken into by fan (230), then, supercooling with heat exchanger (210) in the cold-producing medium heat exchange of refrigerant passage (205), turn back to supercooling again with compressor (221).And, in above-mentioned control part (242), when the target chilling temperature is low, allow the operating frequency of fan (230) of heat source side heat exchanger (222) reduce, the supercooling of flowing in heat exchanger (210) in supercooling is increased with the flow of cold-producing medium.And, in above-mentioned control part (242), when the target chilling temperature is higher, allow the operating frequency of fan (230) of heat source side heat exchanger (222) increase, the supercooling of flowing in heat exchanger (210) in supercooling is reduced with the flow of cold-producing medium.

And, the 5th solution is on the basis of above-mentioned the 3rd solution, the control part (242) of above-mentioned controller (240), the refrigerant temperature of the refrigerant passage (205) that is cooled in heat exchanger (210) according to the target chilling temperature with in supercooling poor controlled the operating frequency of supercooling with compressor (221).

In above-mentioned solution, when the refrigerant temperature of the refrigerant passage after being cooled (205) is higher than the target chilling temperature, allow supercooling increase, supercooling is reduced with the refrigerant cools temperature in the heat exchanger (210) with the operating frequency of compressor (221).And, when the refrigerant temperature of the refrigerant passage after being cooled (205) is lower than the target chilling temperature, allow supercooling reduce with the operating frequency of compressor (221), supercooling is risen with the refrigerant cools temperature in the heat exchanger (210).Therefore, as information acquisition, carry out the adjustment of cooling capacity by the actual refrigerant temperature that will be cooled exactly.And, because the information of the refrigerant temperature after being cooled in apparatus for supercooling, obtaining by temperature sensor etc., therefore in the present invention, also can under the situation of not accepting the signal relevant, correctly carry out the adjustment of the cooling capacity of apparatus for supercooling with load condition etc. from refrigerating plant (10).

And, the 6th solution is on the basis of above-mentioned the 3rd solution, the control part (242) of above-mentioned controller (240), the design temperature that sets with the suitable saturation temperature of low pressure of cold-producing medium with the supercooling of refrigerant loop (220) according to the target chilling temperature with according to supercooling poor controlled the operating frequency of supercooling with compressor (221).

In above-mentioned solution, with the suitable saturation temperature of low pressure of cold-producing medium, decide the design temperature of being used as the refrigerant temperature after supercooling is cooled in heat exchanger (210) according to supercooling.Therefore, even do not accept the signal of relevant load condition etc. from refrigerating plant (10), the actual refrigerant temperature information much at one that also can obtain and be cooled is correctly adjusted cooling capacity.

And, the 7th solution is on the basis of above-mentioned the 3rd solution, the control part (242) of above-mentioned controller (240), the design temperature that sets with the inlet temperature of compressor (221) according to the target chilling temperature with according to supercooling poor controlled the operating frequency of supercooling with compressor (221).

In above-mentioned solution,, decide the design temperature of being used as the refrigerant temperature after supercooling is cooled in heat exchanger (210) according to the inlet temperature of supercooling with compressor (221).Therefore, even do not accept the signal of relevant load condition etc. from refrigerating plant (10), the actual refrigerant temperature information much at one that also can obtain and be cooled is correctly adjusted cooling capacity.

And, the 8th solution is on the basis of above-mentioned the 4th solution, the control part (242) of above-mentioned controller (240), the refrigerant temperature of the refrigerant passage (205) that is cooled in heat exchanger (210) according to the target chilling temperature with in supercooling poor controlled the operating frequency of fan (230).

In above-mentioned solution, when the refrigerant temperature of the refrigerant passage after being cooled (205) is higher than the target chilling temperature, allow the operating frequency of fan (230) reduce, supercooling is reduced with the refrigerant cools temperature in the heat exchanger (210).And, when the refrigerant temperature of the refrigerant passage after being cooled (205) is lower than the target chilling temperature, allow the operating frequency of fan (230) increase, supercooling is risen with the refrigerant cools temperature in the heat exchanger (210).Therefore, as information acquisition, carry out the adjustment of cooling capacity by the actual refrigerant temperature that will be cooled exactly.And, because the information of the refrigerant temperature after being cooled in apparatus for supercooling, obtaining by temperature sensor etc., therefore in the present invention, also can under the situation of the signal of not accepting relevant load condition etc., correctly carry out the adjustment of the cooling capacity of apparatus for supercooling from refrigerating plant (10).

And, the 9th solution is on the basis of above-mentioned the 4th solution, the control part (242) of above-mentioned controller (240), the design temperature that is determined with the suitable saturation temperature of low pressure of cold-producing medium with the supercooling of refrigerant loop (220) according to the target chilling temperature with according to supercooling poor controlled the operating frequency of fan (230).

And, the 10th solution is on the basis of above-mentioned the 4th solution, the control part (242) of above-mentioned controller (240) according to the target chilling temperature with according to supercooling poor with the design temperature that inlet temperature determined of compressor (221), is controlled the operating frequency of fan (230).

And the 11st solution is on the basis of above-mentioned the 1st solution, and above-mentioned supercooling is outer temperature degree with the ambient conditions of heat exchanger (210).

In above-mentioned solution, adjust the refrigerant cools temperature of supercooling with the refrigerant passage (205) in the heat exchanger (210) according to outer temperature degree.For example, when outer temperature degree is higher, adjust the refrigerant cools temperature lower, and, when outer temperature degree is low, adjust the refrigerant cools temperature higher.That is to say that controller (240) is judged the load condition of refrigerating plant (10) according to outer temperature degree.

And the 12nd solution is on the basis of above-mentioned the 1st solution, and above-mentioned supercooling is the refrigerant flow of refrigerant passage (205) with the ambient conditions of heat exchanger (210).

In above-mentioned solution, adjust the refrigerant cools temperature of supercooling with the refrigerant passage (205) in the heat exchanger (210) according to the actual refrigerant flow of refrigerant passage (205).For example, when its refrigerant flow more for a long time, adjust the refrigerant cools temperature lower, and, when refrigerant flow more after a little while, adjust the refrigerant cools temperature higher.That is to say that controller (240) is judged the load condition of refrigerating plant (10) according to above-mentioned refrigerant flow.

And, the 13rd solution is on the basis of above-mentioned the 1st solution, the above-mentioned supercooling ambient conditions of heat exchanger (210), be the refrigerant temperature of the refrigerant passage (205) before supercooling is cooled in heat exchanger (210), perhaps in be cooled in heat exchanger (210) refrigerant temperature of refrigerant passage (205) afterwards of supercooling.

In above-mentioned solution, according to before being cooled or the actual refrigerant temperature after being cooled adjust the refrigerant cools temperature of supercooling with the refrigerant passage (205) in the heat exchanger (210).For example, when its refrigerant temperature is higher, adjust the refrigerant cools temperature lower, and, when refrigerant temperature is low, adjust the refrigerant cools temperature higher.That is to say that controller (240) is judged the load condition of refrigerating plant (10) according to above-mentioned refrigerant temperature.

And the 14th solution is on the basis of above-mentioned the 1st solution, and above-mentioned cooling fluid circuit is the supercooling usefulness refrigerant loop (220) that circulates and carry out the steam compression type refrigerating circulation with cold-producing medium with the supercooling of fluid as cooling.And the ambient conditions of above-mentioned supercooling usefulness heat exchanger (210) is low pressure or the high-pressure of supercooling with the usefulness of the supercooling in the refrigerant loop (220) cold-producing medium.

In above-mentioned solution, adjust the refrigerant cools temperature of supercooling with the supercooling in the refrigerant loop (220) with the actual low pressure or the high-pressure of cold-producing medium with the refrigerant passage (205) in the heat exchanger (210) according to supercooling.In addition, this supercooling is taken as the suction pressure of supercooling with the compressor of refrigerant loop (220) with the low pressure of cold-producing medium, and supercooling is taken as the ejection pressure of supercooling with the compressor of refrigerant loop (220) with the high-pressure of cold-producing medium.For example, when its low pressure or high-pressure are higher, adjust the refrigerant cools temperature lower, and, when low pressure or high-pressure are low, adjust the refrigerant cools temperature higher.That is to say the load condition that controller (240) is judged refrigerating plant (10) according to supercooling with low pressure in the steam compression type refrigerating circulation of refrigerant loop (220) or high-pressure.

And the 15th solution is on the basis of above-mentioned the 1st solution, and above-mentioned cooling fluid circuit is the supercooling usefulness refrigerant loop (220) that circulates and carry out the steam compression type refrigerating circulation with cold-producing medium with the supercooling of fluid as cooling.And above-mentioned supercooling is with the ambient conditions of heat exchanger (210), for using in supercooling in the heat exchanger (210) the temperature of the supercooling after the refrigerant cools of refrigerant passage (205) with cold-producing medium.

In above-mentioned solution, adjust the refrigerant cools temperature of supercooling with the actual temperature of cold-producing medium with the refrigerant passage (205) in the heat exchanger (210) according to cooled supercooling.In addition, this supercooling also can be used as the inlet temperature of supercooling with the compressor of refrigerant loop (220) with refrigerant temperature.For example, when this supercooling is higher with refrigerant temperature, adjust the refrigerant cools temperature lower, and, when supercooling is low with refrigerant temperature, adjust the refrigerant cools temperature higher.That is to say that controller (240) is judged the load condition of refrigerating plant (10) with the temperature of cold-producing medium with the cooled supercooling in the refrigerant loop (220) according to supercooling.

(effect of invention)

Therefore, according to the 1st solution, owing to adjust the refrigerant cools temperature of refrigerant passage (205) with the ambient conditions of heat exchanger (210) according to detectable supercooling in device, therefore even, also can carry out appropriate operation according to the load condition of utilizing unit (12,13,14) at thermal source unit (11) with utilize between the unit (12,13,14) and do not carry out giving and accepting of signal etc.Therefore, in the time of in apparatus for supercooling being installed in refrigerating plant (10), only the refrigerant passage (205) of apparatus for supercooling is connected on the connecting pipe of refrigerating plant (10) just, needn't be provided with in order to the communication of the signal of between refrigerating plant (10) and apparatus for supercooling, giving and accepting with wiring.Its result can cut down the operation number when being installed in apparatus for supercooling in the refrigerating plant (10), the accident that the people when can also possible trouble preventing because of misroute etc. operation to be set causes for fault.

And, according to the 2nd solution, owing to be adjusted at supercooling with cooling mobile in the heat exchanger (210) flow of fluid according to the supercooling that determines with the ambient conditions of heat exchanger (210) according to supercooling with the cold-producing medium target chilling temperature of the refrigerating plant (10) in the heat exchanger (210), so this also can only suitably carry out the adjustment of cooling capacity by the information that obtains in apparatus for supercooling.

And, according to the 3rd or the 4th solution, because cooling is made of with refrigerant loop (220) supercooling with fluid circuit, control the flow that cold-producing medium is used in the supercooling of adjusting in the supercooling usefulness heat exchanger (210) by supercooling with the running of the fan (230) of compressor (221) or heat source side heat exchanger (222), therefore can adjust the refrigerant cools temperature of refrigerating plant (10) exactly.

And, because according to the 5th or the 8th solution, according to the actual refrigerant temperature that is cooled in heat exchanger (210) in supercooling, poor with the target chilling temperature, and according to the 6th or the 9th solution, poor according to design temperature that is determined with the suitable saturation temperature of low pressure of cold-producing medium according to supercooling and target chilling temperature, and according to the 7th or the 10th solution, poor according to design temperature that determines with the inlet temperature of compressor (221) according to supercooling and target chilling temperature, carry out the running control of supercooling with compressor (221) and fan (230), therefore, also can be only carry out adjustment with the corresponding cooling capacity of load condition this moment by the information that in apparatus for supercooling, obtains.

And, according to the 11st～the 15th solution, because with outer temperature degree or be the refrigerant flow of refrigerant condition amount of refrigerating plant (10) side and temperature or the ambient conditions that is used as supercooling usefulness heat exchanger (210) with the refrigerant pressure and the temperature of the refrigerant condition amount of refrigerant loop (220) side for supercooling, to be used as the cold-producing medium detected temperatures according to the design temperature that it determined and use, and therefore can accurately and easily it be obtained as the information that obtains in apparatus for supercooling.Its result can improve the higher device of reliability.

The simple declaration of accompanying drawing

Fig. 1 is the piping diagram that shows the structure of the refrigeration system that comprises the supercooling unit.

Fig. 2 is the piping diagram of the action when showing the cold air operation of refrigeration system.

Fig. 3 is the piping diagram of action that shows the 1st heating installation when running of refrigeration system.

Fig. 4 is the piping diagram of action that shows the 1st heating installation when running of refrigeration system.

Fig. 5 is the piping diagram of action that shows the 2nd heating installation when running of refrigeration system.

Fig. 6 is the flow chart that shows the control action of the controller in the supercooling unit.

Fig. 7 is the coordinate diagram that shows the relation of outer temperature degree and target chilling temperature.

The specific embodiment

Below, with reference to accompanying drawing embodiments of the invention are described in detail.

(inventive embodiment)

The refrigeration system of present embodiment is set in the convenience store etc., carries out the cooling that air is in harmonious proportion and showcase is interior in the shop.This refrigeration system is made of supercooling unit (200) and refrigerating plant (10), and wherein, above-mentioned supercooling unit (200) is equipped with this supercooling unit (200) as apparatus for supercooling involved in the present invention in the above-mentioned refrigerating plant (10).

As shown in Figure 1, be provided with outdoor unit (11), air-conditioning unit (12), refrigerator display case (13), refrigerated display case (14), supercharging (booster) unit (15) and supercooling unit (200) at above-mentioned refrigeration system.And refrigerating plant (10) is made of above-mentioned outdoor unit (11), air-conditioning unit (12), refrigerator display case (13), refrigerated display case (14) and supercharging unit (15).In this refrigeration system, outdoor unit (11) and supercooling unit (200) are provided with without, remaining air-conditioning unit (12) etc. is arranged in the shop of convenience store etc.

Be provided with outdoor loop (40) at above-mentioned outdoor unit (11), be provided with air conditioner loop (100) at air-conditioning unit (12), be provided with refrigeration circuit (110) at refrigerator display case (13), be provided with refrigerating circuit (130) at refrigerated display case (14), be provided with boost-up circuit (140) at supercharging unit (15).And, be provided with refrigerant passage (205) at above-mentioned supercooling unit (200).In this refrigeration system, by with pipeline with above-mentioned loop (40,100 ...) and the refrigerant passage (205) of supercooling unit (200) link together and constitute refrigerant loop (20).

And, be provided with the 1st hydraulic fluid side connecting pipe (21), the 2nd hydraulic fluid side connecting pipe (22), the 1st gas side connecting pipe (23) and the 2nd gas side connecting pipe (24) at above-mentioned refrigerant loop (20).

Above-mentioned the 1st hydraulic fluid side connecting pipe (21) is connected an end of the refrigerant passage (205) of supercooling unit (200) on the outdoor loop (40).One end of above-mentioned the 2nd hydraulic fluid side connecting pipe (22) is connected the other end of refrigerant passage (205).The other end of above-mentioned the 2nd hydraulic fluid side connecting pipe (22) is divided into 3 branches, is connected on air conditioner loop (100), refrigeration circuit (110) and the refrigerating circuit (130).The branch pipe that is connected refrigerating circuit (130) in the 2nd hydraulic fluid side connecting pipe (22) is provided with hydraulic fluid side shut off valve (25).

One end of above-mentioned the 1st gas side connecting pipe (23) is divided into two branches, is connected on refrigeration circuit (110) and the boost-up circuit (140).The branch pipe that is connected boost-up circuit (140) in the 1st gas side connecting pipe (23) is provided with gas side shut off valve (26).The other end of above-mentioned the 1st gas side connecting pipe (23) is connected on the outdoor loop (40).Above-mentioned the 2nd gas side connecting pipe (24) is connected air conditioner loop (100) on the outdoor loop (40).

＜outdoor unit 〉

Above-mentioned outdoor unit (11) constitutes the thermal source unit of refrigerating plant (10).In the outdoor loop (40) of this outdoor unit (11), be provided with variable displacement compressor (41), the 1st fixed-capacity compressor (42), the 2nd fixed-capacity compressor (43), outdoor heat converter (44), receiver (receiver) (45) and outdoor expansion valve (46).And, in this outdoor loop (40), be provided with 3 suction lines (61,62,63), two bleed pipes (64,65), 4 liquid lines (81,82,83,84) and a high-pressure gas pipe (66).And, in this outdoor loop (40), be provided with 3 No. four transfer valves (51,52,53), a hydraulic fluid side shut off valve (54) and two gas side shut off valves (55,56).

In above-mentioned outdoor loop (40), the 1st hydraulic fluid side connecting pipe (21) is connected on the hydraulic fluid side shut off valve (54), the 1st gas side connecting pipe (23) is connected on the 1st gas side shut off valve (55), the 2nd gas side connecting pipe (24) is connected on the 2nd gas side shut off valve (56).

Above-mentioned variable displacement compressor (41), the 1st fixed-capacity compressor (42) and the 2nd fixed-capacity compressor (43) all are Totally-enclosed-types, high pressure dome type vortex-type compressor.Power to above-mentioned variable displacement compressor (41) by converter (inverter).This variable displacement compressor (41) can change the rotary speed of air compressor motor by allowing the output frequency of converter change, and changes its capacity.And the compressor that above-mentioned the 1st, the 2nd fixed-capacity compressor (42,43) always turns round under certain rotary speed for air compressor motor, its capacity can not change.

Above-mentioned the 1st suction line (61), an end are connected on the 1st gas side shut off valve (55).The 1st suction line (61) branches into the 1st branch pipe (61a) and the 2nd branch pipe (61b) at the other end, and the 1st branch pipe (61a) is connected the suction side of variable displacement compressor (41), and the 2nd branch pipe (61b) is connected on the 3 No. four transfer valves (53).The 2nd branch pipe (61b) at above-mentioned the 1st suction line (61) is provided with the check valve (CV-1) that only allows cold-producing medium to flow to the 3rd No. four transfer valves (53) from the 1st gas side shut off valve (55).

Above-mentioned the 2nd suction line (62), an end are connected on the 3 No. four transfer valves (53), and the other end is connected the suction side of the 1st fixed-capacity compressor (42).

Above-mentioned the 3rd suction line (63), an end are connected on the 2 No. four transfer valves (52).This 3rd suction line (63) is the 1st branch pipe (63a) and the 2nd branch pipe (63b) in other end difference, and the 1st branch pipe (63a) is connected the suction side of the 2nd fixed-capacity compressor (43), and the 2nd branch pipe (63b) is connected on the 3 No. four transfer valves (53).Be provided with the check valve (CV-2) that only allows cold-producing medium to flow to the 3rd No. four transfer valves (53) from the 2 No. four transfer valves (52) at the 2nd branch pipe (63b) of above-mentioned the 3rd suction line (63).

Above-mentioned the 1st bleed pipe (64), at one end difference is the 1st branch pipe (64a) and the 2nd branch pipe (64b), the 1st branch pipe (64a) is connected the ejection side of variable displacement compressor (41), and the 2nd branch pipe (64b) is connected the ejection side of the 1st fixed-capacity compressor (42).The other end of the 1st bleed pipe (64) is connected on the 1 No. four transfer valves (51).The 2nd branch pipe (64b) at the 1st bleed pipe (64) is provided with the check valve (CV-3) that only allows cold-producing medium to flow to the 1st No. four transfer valves (51) from the 1st fixed-capacity compressor (42).

Above-mentioned the 2nd bleed pipe (65), an end is connected the suction side of the 2nd fixed-capacity compressor (43), and the other end is connected the positive front of the 1st No. four transfer valves (51) in the 1st bleed pipe (64).Be provided with the check valve (CV-4) that only allows cold-producing medium to flow to the 1st No. four transfer valves (51) from the 2nd fixed-capacity compressor (43) at the 2nd bleed pipe (65).

Above-mentioned outdoor heat converter (44) is the fin tube type heat exchanger of transverse fin formula.In this outdoor heat converter (44), between cold-producing medium and outdoor air, carry out heat exchange.One end of this outdoor heat converter (44) is connected on the 1 No. four transfer valves (51) by shut off valve (57).And the other end of above-mentioned outdoor heat converter (44) is connected the top of receiver (45) by the 1st liquid line (81).Be provided with the check valve (CV-5) that only allows cold-producing medium to flow to receiver (45) from outdoor heat converter (44) at the 1st liquid line (81).

An end of the 2nd liquid line (82) is connected the bottom of above-mentioned receiver (45) by shut off valve (58).The other end of the 2nd liquid line (82) is connected on the hydraulic fluid side shut off valve (54).Be provided with the check valve (CV-6) that only allows cold-producing medium to flow to hydraulic fluid side shut off valve (54) from receiver (45) at the 2nd liquid line (82).

One end of the 3rd liquid line (83) is connected between the check valve (CV-6) and hydraulic fluid side shut off valve (54) in above-mentioned the 2nd liquid line (82).The other end of the 3rd liquid line (83) is connected the top of receiver (45) by the 1st liquid line (81).And, be provided with the check valve (CV-7) that only allows cold-producing medium to flow to the other end from an end at the 3rd liquid line (83).

One end of the 4th liquid line (84) is connected between the check valve (CV-6) and shut off valve (58) in above-mentioned the 2nd liquid line (82).The other end of the 4th liquid line (84) is connected between the outdoor heat converter (44) and check valve (CV-5) in the 1st liquid line (81).And,, be disposed with check valve (CV-8) and outdoor expansion valve (46) from an end towards the other end in the 4th liquid line (84).This check valve (CV-8) only allows cold-producing medium to flow to the other end from an end of the 4th liquid line (84).And above-mentioned outdoor expansion valve (46) is made of electric expansion valve.

Above-mentioned high-pressure gas pipe (66), an end are connected the positive front of the 1st No. four transfer valves (51) in the 1st bleed pipe (64).This high-pressure gas pipe (66), in other end difference is the 1st branch pipe (66a) and the 2nd branch pipe (66b), the 1st branch pipe (66a) is connected the downstream side of the check valve (CV-5) in the 1st liquid line (81), and the 2nd branch pipe (66b) is connected on the 3 No. four transfer valves (53).The 1st branch pipe (66a) at above-mentioned high-pressure gas pipe (66) is provided with magnetic valve (SV-7) and check valve (CV-9).This check valve (CV-9) is arranged in the downstream side of magnetic valve (SV-7), only allows cold-producing medium to flow to the 1st liquid line (81) from magnetic valve (SV-7).

Above-mentioned the 1 No. four transfer valves (51), the 1st port (port) is connected the terminal of the 1st bleed pipe (64), the 2nd port is connected the 2 No. four transfer valves (52), and the 3rd port is connected outdoor heat converter (44), and the 4th port is connected the 2nd gas side shut off valve (56).The 1 No. four transfer valves (51) can switch to the 1st state (state that Fig. 1 represents with solid line) and the 2nd state (state that Fig. 1 dots), wherein, described the 1st state is that the 1st port and the 3rd port are interconnected, the state that the 2nd port and the 4th port are interconnected, described the 2nd state is that the 1st port and the 4th port are interconnected, the state that the 2nd port and the 3rd port are interconnected.

Above-mentioned the 2 No. four transfer valves (52), the 1st port is connected the downstream side of the check valve (CV-4) in the 2nd bleed pipe (65), and the 2nd port is connected the initiating terminal of the 2nd suction line (62), and the 4th port is connected the 2nd port of the 1st No. four transfer valves (51).And the 3rd port of the 2nd No. four transfer valves (52) is sealed.The 2 No. four transfer valves (52) can switch to the 1st state (state that Fig. 1 represents with solid line) and the 2nd state (state that Fig. 1 dots), wherein, above-mentioned the 1st state is that the 1st port and the 3rd port are interconnected, the state that the 2nd port and the 4th port are interconnected, above-mentioned the 2nd state is that the 1st port and the 4th port are interconnected, the state that the 2nd port and the 3rd port are interconnected.

Above-mentioned the 3 No. four transfer valves (53), the 1st port is connected the terminal of the 2nd branch pipe (66b) of high-pressure gas pipe (66), the 2nd port is connected the initiating terminal of the 2nd suction line (62), the 3rd port is connected the terminal of the 2nd branch pipe (61b) of the 1st suction line (61), and the 4th port is connected the terminal of the 2nd branch pipe (63b) of the 3rd suction line (63).The 3 No. four transfer valves (53) can switch to the 1st state (state that Fig. 1 represents with solid line) and the 2nd state (state that Fig. 1 dots), wherein, above-mentioned the 1st state is that the 1st port and the 3rd port are interconnected, the state that the 2nd port and the 4th port are interconnected, above-mentioned the 2nd state is that the 1st port and the 4th port are interconnected, the state that the 2nd port and the 3rd port are interconnected.

Also be provided with playpipe (85), communicating pipe (87), oil eliminator (75) and oil return pipe (76) in above-mentioned outdoor loop (40).And, in this outdoor loop (40), also be provided with 4 oil equalizing pipes (71,72,73,74).

Above-mentioned playpipe (85) sprays in order to carry out so-called liquid.This playpipe (85), an end are connected between the check valve (CV-8) and outdoor expansion valve (46) in the 4th liquid line (84), and the other end is connected on the 1st suction line (61).In this playpipe (85), be disposed with shut off valve (59) and flow control valve (86) towards the other end from an end.This flow control valve (86) is made of electric expansion valve.

Above-mentioned communicating pipe (87), an end is connected between the shut off valve (59) and flow control valve (86) in the playpipe (85), and the other end is connected the upstream side of the magnetic valve (SV-7) in the 1st branch pipe (66a) of high-pressure gas pipe (66).Be provided with the check valve (CV-10) that only allows cold-producing medium to flow to the other end from an end this communicating pipe (87).

Above-mentioned oil eliminator (75), the link position that is arranged on ratio the 2nd bleed pipe (65) in the 1st bleed pipe (64) and high-pressure gas pipe (66) is by on the position of upstream side.This oil eliminator (75) is to be used for from the ejection gas of compressor (41,42) refrigerator oil being separated.

Above-mentioned oil return pipe (76), an end are connected on the oil eliminator (75).This oil return pipe (76), in other end difference is the 1st branch pipe (76a) and the 2nd branch pipe (76b), the 1st branch pipe (76a) is connected the downstream side of the flow control valve (86) in the playpipe (85), and the 2nd branch pipe (76b) is connected on the 2nd suction line (62).And, be respectively arranged with a magnetic valve (SV-5, SV-6) at the 1st branch pipe (76a) and the 2nd branch pipe (76b) of above-mentioned oil return pipe (76).After opening the magnetic valve (SV-5) of above-mentioned the 1st branch pipe (76a), the refrigerator oil that separates in oil eliminator (75) is sent back to the 1st suction line (61) by playpipe (85).On the other hand, after opening the magnetic valve (SV-6) of above-mentioned the 2nd branch pipe (76b), the refrigerator oil that separates in oil eliminator (75) is sent back to the 2nd suction line (62).

Above-mentioned the 1st oil equalizing pipe (71), an end are connected on the variable displacement compressor (41), and the other end is connected on the 2nd suction line (62).Be provided with magnetic valve (SV-1) at the 1st oil equalizing pipe (71).Above-mentioned the 2nd oil equalizing pipe (72), an end are connected on the 1st fixed-capacity compressor (42), and the other end is connected on the 1st branch pipe (63a) of the 3rd suction line (63).Be provided with magnetic valve (SV-2) at the 2nd oil equalizing pipe (72).Above-mentioned the 3rd oil equalizing pipe (73), an end are connected on the 2nd fixed-capacity compressor (43), and the other end is connected on the 1st branch pipe (61a) of the 1st suction line (61).Be provided with magnetic valve (SV-3) at the 3rd oil equalizing pipe (73).Above-mentioned the 4th oil equalizing pipe (74), an end are connected the upstream side of the magnetic valve (SV-2) in the 2nd oil equalizing pipe (72), and the other end is connected on the 1st branch pipe (61a) of the 1st suction line (61).Be provided with magnetic valve (SV-4) at the 4th oil equalizing pipe (74).Magnetic valve by suitably opening or closing above-mentioned each oil equalizing pipe (71～74) (SV-1～SV-4), the amount of stockpiling of the refrigerator oil in each compressor (41,42,43) is average.

Be provided with various sensors and pressure switch in above-mentioned outdoor loop (40).Specifically, be provided with the 1st inlet temperature sensor (91) and the 1st suction pressure sensor (92) at above-mentioned the 1st suction line (61).Be provided with the 2nd suction pressure sensor (93) at above-mentioned the 2nd suction line (62).Be provided with the 3rd inlet temperature sensor (94) and the 3rd suction pressure sensor (95) at above-mentioned the 3rd suction line (63).Be provided with the 1st ejection temperature sensor (97) and the 1st ejection pressure sensor (98) at above-mentioned the 1st bleed pipe (64).Each branch pipe (64a, 64b) at above-mentioned the 1st bleed pipe (64) is respectively arranged with a high-pressure switch (96).Be provided with the 2nd ejection temperature sensor (99) and high-pressure switch (96) at above-mentioned the 2nd bleed pipe (65).

And, air-temperature sensor (90) and outdoor fan (48) outside above-mentioned outdoor unit (11) is provided with.By outdoor fan (48) outdoor air is delivered to above-mentioned outdoor heat converter (44).

＜air-conditioning unit 〉

Above-mentioned air-conditioning unit (12) formation is utilized unit.The air conditioner loop (100) of this air-conditioning unit (12), that end of its hydraulic fluid side are connected the 2nd hydraulic fluid side connecting pipe (22), and that end of gas side is connected the 2nd gas side connecting pipe (24).

In above-mentioned air conditioner loop (100), that end is disposed with air-conditioning expansion valve (102) and heat exchanger of air condition (101) towards that end of gas side from the hydraulic fluid side.This heat exchanger of air condition (101) is the fin tube type heat exchanger of horizontal tab style.In this heat exchanger of air condition (101), between cold-producing medium and room air, carry out heat exchange.On the other hand, above-mentioned air-conditioning expansion valve (102) is made of electric expansion valve.

Be provided with heat-exchanger temperature sensor (103) and refrigerant temperature sensors (104) at above-mentioned air-conditioning unit (12).This heat-exchanger temperature sensor (103) is installed on the heat-transfer pipe of heat exchanger of air condition (101).Above-mentioned refrigerant temperature sensors (104) be installed in that end of gas side in the air conditioner loop (100) near.And, be provided with interior air-temperature sensor (106) and air-conditioning fan (105) at above-mentioned air-conditioning unit (12).By air-conditioning fan (105) room air in the shop is delivered to above-mentioned heat exchanger of air condition (101).

＜refrigerator display case 〉

Above-mentioned refrigerator display case (13) formation is utilized unit.The refrigeration circuit (110) of this refrigerator display case (13), that end of its hydraulic fluid side are connected the 2nd hydraulic fluid side connecting pipe (22), and that end of gas side is connected the 1st gas side connecting pipe (23).

In above-mentioned refrigeration circuit (110), that end is disposed with refrigeration magnetic valve (114), refrigeration expansion valve (112) and refrigeration heat exchanger (111) towards that end of gas side from the hydraulic fluid side.This refrigeration heat exchanger (111) is the fin tube type heat exchanger of horizontal tab style.In this refrigeration heat exchanger (111), between cold-producing medium and Ku Nei air, carry out heat exchange.Above-mentioned refrigeration expansion valve (112) is made of the temperature automatic expansion valve.The temperature sensing tube (113) of this refrigeration expansion valve (112) is installed on the outlet side pipeline of refrigeration heat exchanger (111).

Be provided with temperature sensor in the freezer (116) and freezer internal fan (115) at above-mentioned refrigerator display case (13).By freezer internal fan (115) air in the storehouse of refrigerator display case (13) is delivered to above-mentioned refrigeration heat exchanger (111).

＜refrigerated display case 〉

Above-mentioned refrigerated display case (14) formation is utilized unit.The refrigerating circuit (130) of this refrigerated display case (14), that end of hydraulic fluid side are connected the 2nd hydraulic fluid side connecting pipe (22).And that end of gas side of this refrigerating circuit (130) is connected supercharging unit (15) by pipeline.

In above-mentioned refrigerating circuit (130), that end is disposed with freezing magnetic valve (134), freezing expansion valve (132) and freezing heat-exchanger (131) towards that end of gas side from the hydraulic fluid side.This freezing heat-exchanger (131) is the fin tube type heat exchanger of horizontal tab style.In this freezing heat-exchanger (131), between cold-producing medium and Ku Nei air, carry out heat exchange.Above-mentioned freezing expansion valve (132) is made of the temperature automatic expansion valve.The temperature sensing tube (133) of this freezing expansion valve (132) is installed on the outlet side pipeline of freezing heat-exchanger (131).

Be provided with temperature sensor in the freezer (136) and freezer internal fan (135) at above-mentioned refrigerated display case (14).By freezer internal fan (135) air in the storehouse of refrigerated display case (14) is delivered to above-mentioned freezing heat-exchanger (131).

＜supercharging unit 〉

In the boost-up circuit (140) of above-mentioned supercharging unit (15), be provided with booster compressor (141), suction line (143), bleed pipe (144) and bypass pipe (150).

Above-mentioned booster compressor (141) is the high pressure dome type vortex-type compressor of full seal type.Power to this booster compressor (141) by converter.This booster compressor (141) can change by the output frequency that makes converter, changes the rotary speed of air compressor motor, changes its capacity.

Above-mentioned suction line (143), terminal is connected the suction side of booster compressor (141).The initiating terminal of this suction line (143) is connected that end of gas side of refrigerating circuit (130) by pipeline.

Above-mentioned bleed pipe (144), initiating terminal are connected the ejection side of booster compressor (141), and terminal is connected the 1st gas side connecting pipe (23).In this bleed pipe (144), be disposed with high-pressure switch (148), oil eliminator (145) and ejection side check valve (149) from initiating terminal towards terminal.This ejection side check valve (149) only allows cold-producing medium to flow to terminal from the initiating terminal of bleed pipe (144).

Above-mentioned oil eliminator (145) is in order to refrigerator oil is separated from the ejection gas of booster compressor (141).One end of oil return pipe (146) is connected on this oil eliminator (145).The other end of above-mentioned oil return pipe (146) is connected on the suction line (143).Be provided with capillary (147) at this oil return pipe (146).The refrigerator oil that separates in above-mentioned oil eliminator (145) is sent back to the suction side of booster compressor (141) by oil return pipe (146).

Above-mentioned bypass pipe (150), initiating terminal are connected suction line (143), and terminal is connected the oil eliminator (145) in the bleed pipe (64) and sprays between the side check valve (149).Be provided with the bypass check valve (151) that only allows cold-producing medium to flow to terminal from initiating terminal at this bypass pipe (150).

＜supercooling unit 〉

Above-mentioned supercooling unit (200) comprising: refrigerant passage (205), supercooling refrigerant loop (220) and controller (240).

Above-mentioned refrigerant passage (205), an end are connected the 1st hydraulic fluid side connecting pipe (21), and the other end is connected the 2nd hydraulic fluid side connecting pipe (22).

Above-mentioned supercooling is the loop circuit that successively supercooling is formed by connecting with heat exchanger (210) with expansion valve (223) and supercooling with outdoor heat converter (222), supercooling with compressor (221), supercooling with pipeline with refrigerant loop (220).Constitute in this supercooling and the conduct cooling that is filled to be circulated with cold-producing medium with the supercooling of fluid carry out the cooling fluid circuit that steam compression type refrigerating circulates with refrigerant loop (220).

Above-mentioned supercooling is the high pressure dome type vortex-type compressor of full seal type with compressor (221).Power with compressor (221) to this supercooling by converter.This supercooling can change by the output frequency that makes converter with compressor (221), changes the rotary speed of air compressor motor, changes its capacity.

Above-mentioned supercooling is the fin tube type heat exchanger of transverse fin formula with outdoor heat converter (222), constitutes the heat source side heat exchanger.Use in the outdoor heat converter (222) in this supercooling, between supercooling is with cold-producing medium and outdoor air, carry out heat exchange.Above-mentioned supercooling is made of electric expansion valve with expansion valve (223).

Above-mentioned supercooling is so-called heat-exchangers of the plate type with heat exchanger (210), constitutes to utilize the side heat exchanger.Form a plurality of the 1st streams (211) and the 2nd stream (212) in this supercooling respectively with heat exchanger (210).Supercooling is connected on the 1st stream (211) with refrigerant loop (220), refrigerant passage (205) is connected on the 2nd stream (212).And this supercooling makes the cold-producing medium heat exchange of the supercooling of circulation the 1st stream (211) with the refrigerating plant (10) of cold-producing medium and circulation the 2nd stream (212) with heat exchanger (210).

In above-mentioned supercooling unit (200), be provided with various sensors and pressure switch.Specifically, use in the refrigerant loop (220) in above-mentioned supercooling, inlet temperature sensor (235) and suction pressure sensor (234) are arranged on the suction side of supercooling with compressor (221), will spray temperature sensor (233) and high-pressure switch (232) and be arranged on the ejection side of supercooling with compressor (221).In refrigerant passage (205), than supercooling with heat exchanger (210) by the part of the other end, promptly the part by the end that is connected the 2nd hydraulic fluid side connecting pipe (22) is provided with refrigerant temperature sensors (236).This refrigerant temperature sensors (236) constitutes the refrigerant temperature detector.

And, air-temperature sensor (231) and outdoor fan (230) outside in above-mentioned supercooling unit (200), being provided with.By outdoor fan (230) outdoor air is delivered to above-mentioned supercooling outdoor heat converter (222).

Above-mentioned controller (240) constitutes control device.In this controller (240), be provided with configuration part (241) and control part (242).

The outer temperature degree of the detected temperatures of air-temperature sensor (231) outside above-mentioned configuration part (241) are input as.And this configuration part (241) constitute the predefined supercooling of outer temperature degree that set basis the is transfused to cold-producing medium target chilling temperature (Eom) with the refrigerant passage (205) in the heat exchanger (210).For example, when outer temperature degree was higher, because the cooling load in the shop becomes big, therefore the target chilling temperature (Eom) with cold-producing medium was set at lower temperature.On the contrary, when outer temperature degree was low, because the cooling load in the shop diminishes, therefore the target chilling temperature (Eom) with cold-producing medium was set at higher temperature.That is to say, in the configuration part (241) of present embodiment, outer temperature degree is used the ambient conditions of heat exchanger (210) as supercooling.

To the detected temperatures (Tout) of above-mentioned control part (242) input refrigerant temperature sensors (236) and the detected pressures (LP) of suction pressure sensor (234).And, this control part (242), constitute when refrigerant temperature sensors (236) can normally detect, control the operating frequency of supercooling with compressor (221) according to the difference of the target chilling temperature (Eom) of the detected temperatures (Tout) of refrigerant temperature sensors (236) and configuration part (241).

And, above-mentioned control part (242) constitute when refrigerant temperature sensors (236) unusual, in the time of can not detecting, control the operating frequency of supercooling with compressor (221) according to the design temperature (Tout) that determines with the saturation temperature (TG) of cold-producing medium according to the supercooling of the detected pressures that is equivalent to suction pressure sensor (234) (LP) and the difference of target chilling temperature (Eom).That is to say, in this control part (242), will be used as the detected temperatures of refrigerant temperature sensors (236) according to the design temperature (Tout) that supercooling determines with the suitable saturation temperature of low pressure (TG) of cold-producing medium with the supercooling of refrigerant loop (220).In the present embodiment, for example, set design temperature (Tout) with saturation temperature (TG)+α ℃.This α can set arbitrarily.

In addition, in the present embodiment, though the design temperature that control part (242) will determine according to the detected pressures (LP) of suction pressure sensor (234) has been used as the detected temperatures (Tout) of cold-producing medium, but also can replace it, will be inlet temperature and the design temperature (Tout) that determines is used as the detected temperatures (Tout) of cold-producing medium according to the detected temperatures (Ti) of inlet temperature sensor (235).At that time, to the detected temperatures (Tout) of control part (242) input refrigerant temperature sensors (236) and the detected temperatures (Ti) of inlet temperature sensor (235).And, this control part (242), constitute and work as refrigerant temperature sensors (236) unusually, in the time of can not detecting, the design temperature (Tout) that determines according to the detected temperatures (Ti) according to inlet temperature sensor (235) and the difference of target chilling temperature (Eom) are controlled the operating frequency of supercooling with compressor (221).At this moment, for example, set design temperature (Tout) with detected temperatures (Ti)+β ℃.This β can set arbitrarily.

Because if allow the words of above-mentioned supercooling with the operating frequency increase of compressor (221), then supercooling uses the internal circulating load of cold-producing medium to increase with the supercooling of refrigerant loop (220), supercooling increases with the heat exchange amount of the supercooling in the heat exchanger (210) with the cold-producing medium of cold-producing medium and refrigerating plant (10), therefore the chilling temperature of the cold-producing medium of refrigerating plant (10) descends, the increases such as refrigerating capacity of air-conditioning unit (12).And, because if allow the words of above-mentioned supercooling with the operating frequency decline of compressor (221), then supercooling uses the internal circulating load of cold-producing medium to reduce with the supercooling of refrigerant loop (220), supercooling reduces with the heat exchange amount of the supercooling in the heat exchanger (210) with the cold-producing medium of cold-producing medium and refrigerating plant (10), therefore the chilling temperature of the cold-producing medium of refrigerating plant (10) rises, the declines such as refrigerating capacity of air-conditioning unit (12).That is to say, above-mentioned controller (240), carry out the volume controlled of supercooling according to outer temperature degree, adjust supercooling with the flow of the supercooling in the heat exchanger (210), adjust the chilling temperature of the cold-producing medium of refrigerating plant (10) with cold-producing medium with compressor (221).

So, come the signal of the refrigerating plant (10) of free off-premises station group (11) and air-conditioning unit formations such as (12) all not to be imported into controller (240).That is to say that this controller (240) only according to the detected value etc. of the sensor that is arranged on supercooling unit (200), carries out the running control of supercooling with compressor (221) in the inner information that obtains of supercooling unit (200).Therefore, need be in order to not deliver letters between the two at above-mentioned supercooling unit (200) and refrigerating plant (10) and the wiring lines engineering of trusted.

And, in the configuration part (241) of present embodiment, though, also can replace this outer temperature degree with following thing (parameter) according to having set the target chilling temperature (Eom) of cold-producing medium with the outer temperature degree of the ambient conditions of heat exchanger (210) as supercooling.

For example, above-mentioned configuration part (241) also can be with the refrigerant flow of refrigerant passage (205), i.e. the ambient conditions of heat exchanger (210) is used in supercooling as supercooling with the refrigerant flow of the refrigerating plant (10) in the heat exchanger (210).At this moment, the supercooling in refrigerant passage (205) is provided with the flow detector of cold-producing medium with the upper reaches of heat exchanger (210), the detection flow of this flow detector is input to the configuration part (241) of controller (240).And, above-mentioned configuration part (241), when the detection flow that is transfused to more for a long time, the cooling load of judging in the shop is bigger, the target chilling temperature (Eom) of cold-producing medium is set at lower temperature, on the contrary, when detecting flow more after a little while, the cooling load of judging in the shop is less, and the target chilling temperature (Eom) of cold-producing medium is set at higher temperature.

And, above-mentioned configuration part (241), also can be with the refrigerant temperature of the refrigerant passage (205) before supercooling is cooled in heat exchanger (210), perhaps the refrigerant temperature of the refrigerant passage (205) after supercooling is cooled in heat exchanger (210) is as the ambient conditions of supercooling usefulness heat exchanger (210).At this moment, supercooling in refrigerant passage (205) is provided with the Temperature Detector of cold-producing medium with the upper reaches of heat exchanger (210), the detected temperatures of this flow detector is input to the configuration part (241) of controller (240) as the refrigerant temperature before being cooled.Perhaps, will be arranged on supercooling is input to controller (240) with the detected temperatures of the dirty refrigerant temperature sensors (236) of heat exchanger (210) configuration part (241).And, above-mentioned configuration part (241), when the detected temperatures that is transfused to is higher, the cooling load of judging in the shop is bigger, the target chilling temperature (Eom) of cold-producing medium is set at lower temperature, on the contrary, when detected temperatures is low, the cooling load of judging in the shop is less, and the target chilling temperature (Eom) of cold-producing medium is set at higher temperature.

And, above-mentioned configuration part (241), the also ambient conditions that supercooling can be used heat exchanger (210) with the supercooling in the refrigerant loop (220) with the low pressure or the high-pressure of cold-producing medium as supercooling.At this moment, will be arranged on supercooling and be input to configuration part (241) as low pressure with the detected pressures of the suction pressure sensor (234) of the suction side of compressor (221).Perhaps, with the ejection side of compressor (221) pressure detector of cold-producing medium is set, the detected pressures of this pressure detector is input to configuration part (241) as high-pressure in above-mentioned supercooling.And, above-mentioned configuration part (241), when the detected pressures that is transfused to is higher, the cooling load of judging in the shop is bigger, the target chilling temperature (Eom) of cold-producing medium is set at lower temperature, on the contrary, when detected pressures is low, the cooling load of judging in the shop is less, and the target chilling temperature (Eom) of cold-producing medium is set at higher temperature.

And, above-mentioned configuration part (241), also can be with the supercooling after supercooling is cooled in heat exchanger (210) with the temperature of cold-producing medium as the ambient conditions of supercooling with heat exchanger (210).At this moment, supercooling is input to configuration part (241) with the detected temperatures of the inlet temperature sensor (235) of compressor (221).Perhaps, in above-mentioned supercooling with the just dirty Temperature Detector that cold-producing medium be set of the supercooling in the refrigerant loop (220) with heat exchanger (210), replace the detected temperatures of above-mentioned inlet temperature sensor (235) with the detected temperatures of this Temperature Detector, be input to configuration part (241).And, above-mentioned configuration part (241), when the detected temperatures that is transfused to is higher, the cooling load of judging in the shop is bigger, the target chilling temperature (Eom) of cold-producing medium is set at lower temperature, on the contrary, when detected temperatures is low, the cooling load of judging in the shop is less, and the target chilling temperature (Eom) of cold-producing medium is set at higher temperature.

As mentioned above because any one parameter all is the information that obtains in the inside of supercooling unit (200), therefore do not need and refrigerating plant (10) between deliver letters and trusted.

The running action of-refrigeration system-

Main action in the running action that above-mentioned refrigeration system is carried out is illustrated.

＜cold air operation 〉

This cold air operation carries out the cooling of room air for to carry out the cooling of air in the storehouse in refrigerator display case (13) and refrigerated display case (14) in air-conditioning unit (12), with the running of freezing in the shop.

As shown in Figure 2, in cold air operation, respectively the 1 No. four transfer valves (51), the 2 No. four transfer valves (52) and the 3 No. four transfer valves (53) are set at the 1st state.And,, on the other hand, suitably regulate the aperture of air-conditioning expansion valve (102), refrigeration expansion valve (112) and freezing expansion valve (132) respectively with outdoor expansion valve (46) Close All.Under this state, make variable displacement compressor (41), the 1st fixed-capacity compressor (42), the 2nd fixed-capacity compressor (43) and booster compressor (141) running.In this cold air operation, supercooling unit (200) becomes operating condition.Running action to supercooling unit (200) later on is illustrated.

Be sent to outdoor heat converter (44) from the cold-producing medium of above-mentioned variable displacement compressor (41), the 1st fixed-capacity compressor (42) and the 2nd fixed-capacity compressor (43) ejection by the 1 No. four transfer valves (51).In this outdoor heat converter (44), cold-producing medium is to outdoor air heat release, condensation.Condensed refrigerant flows into the 1st hydraulic fluid side connecting pipe (21) by the 1st liquid line (81), receiver (45) and the 2nd liquid line (82) successively in this outdoor heat converter (44).

The cold-producing medium that flows into above-mentioned the 1st hydraulic fluid side connecting pipe (21) flows into the refrigerant passage (205) of supercooling unit (200).Flow into the cold-producing medium of this refrigerant passage (205), during by 2nd stream (212) of supercooling, be cooled with heat exchanger (210).The liquid refrigerant of the supercooling state that is cooled in heat exchanger (210) in this supercooling is assigned to air conditioner loop (100), refrigeration circuit (110) and refrigerating circuit (130) by the 2nd hydraulic fluid side connecting pipe (22).

The cold-producing medium that flows into above-mentioned air conditioner loop (100) is depressurized the back and imports heat exchanger of air condition (101) by air-conditioning expansion valve (102) time.In this heat exchanger of air condition (101), cold-producing medium absorbs heat from room air, evaporation.At that time, in this heat exchanger of air condition (101), the evaporating temperature of cold-producing medium is set at for example about 5 ℃.In above-mentioned air-conditioning unit (12), the room air that will cool off in heat exchanger of air condition (101) provides in the shop.

The cold-producing medium of evaporation flows into outdoor loop (40) by the 2nd gas side connecting pipe (24) in above-mentioned heat exchanger of air condition (101), then, and successively by the 1 No. four transfer valves (51) and the 2 No. four transfer valve (52) inflow the 3rd suction lines (63).Flow into the cold-producing medium of the 3rd suction line (63), a part sucks the 2nd fixed-capacity compressor (43) by the 1st branch pipe (63a), and is remaining successively by the 2nd branch pipe (63b), the 3 No. four transfer valve (53) and the 2nd suction line (62) suction the 1st fixed-capacity compressor (42).

The cold-producing medium that flows into above-mentioned refrigeration circuit (110) is depressurized the back and imports refrigeration heat exchanger (111) by refrigeration expansion valve (112) time.In this refrigeration heat exchanger (111), cold-producing medium air heat absorption in the storehouse, evaporation.At that time, in this refrigeration heat exchanger (111), the evaporating temperature of cold-producing medium for example is set at about-5 ℃.The cold-producing medium of evaporation flows into the 1st gas side connecting pipe (23) in this refrigeration heat exchanger (111).Air offers in the storehouse in the storehouse that will cool off in refrigeration heat exchanger (111) in above-mentioned refrigerator display case (13), and storehouse temperature is remained on for example about 5 ℃.

The cold-producing medium that flows into above-mentioned refrigerating circuit (130) is depressurized the back and imports freezing heat-exchanger (131) by freezing expansion valve (132) time.In this freezing heat-exchanger (131), cold-producing medium is the air heat absorption in the storehouse, evaporation.At that time, in this freezing heat-exchanger (131), the evaporating temperature of cold-producing medium for example is set at about-30 ℃.Air offers in the storehouse in the storehouse that will be cooled in freezing heat-exchanger (131) in above-mentioned refrigerated display case (14), and storehouse temperature is for example remained on about-20 ℃.

The cold-producing medium of evaporation in above-mentioned freezing heat-exchanger (131) flows into boost-up circuit (140), is inhaled into booster compressor (141).Compressed cold-producing medium flows into the 1st gas side connecting pipe (23) by bleed pipe (144) in this booster compressor (141).

In above-mentioned the 1st gas side connecting pipe (23), cold-producing medium of sending into from refrigeration circuit (110) and the cold-producing medium interflow of sending into from boost-up circuit (140).And these cold-producing mediums flow into the 1st suction line (61) in outdoor loop (40) by the 1st gas side connecting pipe (23).The cold-producing medium that flows into the 1st suction line (61) is inhaled into variable displacement compressor (41) by its 1st branch pipe (61a).

＜the 1 heating installation running 〉

The 1st heating installation operates as the cooling of carrying out air in the storehouse in refrigerator display case (13) and refrigerated display case (14), carries out the heating of room air in air-conditioning unit (12), gives the running of heating in the shop.

As shown in Figure 3, in outdoor loop (40), the 1 No. four transfer valves (51) are set at the 2nd state, the 2 No. four transfer valves (52) are set at the 1st state, the 3 No. four transfer valves (53) are set at the 1st state.And,, on the other hand, suitably regulate the aperture of air-conditioning expansion valve (102), refrigeration expansion valve (112) and freezing expansion valve (132) with above-mentioned outdoor expansion valve (46) Close All.Under this state, make the running of variable displacement compressor (41) and booster compressor (141), the 1st fixed-capacity compressor (42) and the 2nd fixed-capacity compressor (43) are stopped.And above-mentioned outdoor heat converter (44) becomes halted state when not being admitted to cold-producing medium.In the running of the 1st heating installation, supercooling unit (200) becomes halted state.

The heat exchanger of air condition (101) by the 1 No. four transfer valves (51) and the 2nd gas side connecting pipe (24) importing air conditioner loop (100) successively from the cold-producing medium of above-mentioned variable displacement compressor (41) ejection, to the room air heat release, condensation.In above-mentioned air-conditioning unit (12), heated room air is provided in the shop in heat exchanger of air condition (101).Condensed refrigerant is distributed to refrigeration circuit (110) and refrigerating circuit (130) by the 2nd hydraulic fluid side connecting pipe (22) in this heat exchanger of air condition (101).

In above-mentioned refrigerator display case (13) and refrigerated display case (14), the same during with above-mentioned cold air operation, carry out the cooling of air in the storehouse.The cold-producing medium evaporation back in refrigeration heat exchanger (111) that flows into above-mentioned refrigeration circuit (110) flows into the 1st gas side connecting pipe (23).On the other hand, after the cold-producing medium that flows into above-mentioned refrigerating circuit (130) evaporates in freezing heat-exchanger (131), in booster compressor (141), be compressed, flow into the 1st gas side connecting pipe (23) then.Flow into the cold-producing medium of the 1st gas side connecting pipe (23),, be inhaled into variable displacement compressor (41), be compressed by behind the 1st suction line (61).

So, in the running of the 1st heating installation, cold-producing medium heat absorption in refrigeration heat exchanger (111) and freezing heat-exchanger (131), cold-producing medium heat release in heat exchanger of air condition (101).And the heat of cold-producing medium utilization absorption of air in the storehouse heats in the shop in above-mentioned refrigeration heat exchanger (111) and freezing heat-exchanger (131).

In addition, in the running of the 1st heating installation, as shown in Figure 4, also can make the 1st fixed-capacity compressor (42) running.Whether making above-mentioned the 1st fixed-capacity compressor (42) running is to decide according to the cooling load in refrigerator display case (13) and the refrigerated display case (14).At this moment, the 3 No. four transfer valves (53) are set at the 2nd state.And, flow into the cold-producing medium of above-mentioned the 1st suction line (61), a part is inhaled into variable displacement compressor (41) by the 1st branch pipe (61a), and that is left is inhaled into the 1st fixed-capacity compressor (42) by the 2nd branch pipe (61b), the 3 No. four transfer valves (53) and the 2nd suction line (62) successively.

＜the 2 heating installation running 〉

It is the same with above-mentioned the 1st heating installation running that the 2nd heating installation operates as, the running that heats in the shop.In the running of above-mentioned the 1st heating installation, carry out the running of the 2nd heating installation during the heating installation scarce capacity.

As shown in Figure 5, in outdoor loop (40), the 1 No. four transfer valves (51) are set at the 2nd state, the 2 No. four transfer valves (52) are set at the 1st state, the 3 No. four transfer valves (53) are set at the 1st state.And, the aperture of suitably regulating above-mentioned outdoor expansion valve (46), air-conditioning expansion valve (102), refrigeration expansion valve (112) and freezing expansion valve (132).Under this state, make variable displacement compressor (41), the 2nd fixed-capacity compressor (43) and booster compressor (141) running, the 1st fixed-capacity compressor (42) is stopped.In the running of the 1st heating installation, supercooling unit (200) becomes halted state.

Import the heat exchanger of air condition (101) of air conditioner loop (100) by the 1 No. four transfer valves and the 2nd gas side connecting pipe (24) successively from the cold-producing medium of above-mentioned variable displacement compressor (41) and the 2nd fixed-capacity compressor (43) ejection, to room air heat release, condensation.In above-mentioned air-conditioning unit (12), will in heat exchanger of air condition (101), indoor air heated offer in the shop.Condensed refrigerant flows into the 2nd hydraulic fluid side connecting pipe (22) in this heat exchanger of air condition (101).Flow into the cold-producing medium of the 2nd hydraulic fluid side connecting pipe (22), a part is assigned to refrigeration circuit (110) and refrigerating circuit (130), in the remaining refrigerant passage that is imported into supercooling unit (200) (205).

In above-mentioned refrigerator display case (13) and refrigerated display case (14), the same during with above-mentioned cold air operation, carry out the cooling of air in the storehouse.The cold-producing medium evaporation back in refrigeration heat exchanger (111) that flows into above-mentioned refrigeration circuit (110) flows into the 1st gas side connecting pipe (23).On the other hand, flow into the cold-producing medium of above-mentioned refrigerating circuit (130), in freezing heat-exchanger (131), after the evaporation, in booster compressor (141), be compressed, flow into the 1st gas side connecting pipe (23) then.And the cold-producing medium that flows into the 1st gas side connecting pipe (23) is inhaled into variable displacement compressor (41) by behind the 1st suction line (61), is compressed.

The cold-producing medium that flows into the refrigerant passage (205) of above-mentioned supercooling unit (200) flows into receiver (45) by the 1st hydraulic fluid side connecting pipe (21) and the 3rd liquid line (83) successively, then, flows into the 4th liquid line (84) by the 2nd liquid line (82).The cold-producing medium that flows into the 4th liquid line (84) is depressurized by outdoor expansion valve (46) time, then, is imported into outdoor heat converter (44), from outdoor air heat absorption, evaporation.The cold-producing medium of evaporation by the 1 No. four transfer valves (51) and the 2 No. four transfer valve (52) inflow the 2nd suction lines (62), is inhaled into the 2nd fixed-capacity compressor (43) successively in this outdoor heat converter (44), is compressed.

So, in the running of the 2nd heating installation, cold-producing medium heat absorption in refrigeration heat exchanger (111), freezing heat-exchanger (131) and outdoor heat converter (44), cold-producing medium heat release in heat exchanger of air condition (101).And, utilize the heat of cold-producing medium absorption of air in the storehouse in above-mentioned refrigeration heat exchanger (111) and freezing heat-exchanger (131) and outdoor heat converter (44) cold-producing medium heat in the shop from the heat of outdoor air absorption.

The running action of-supercooling unit-

Running action to above-mentioned supercooling unit (200) is illustrated.Under the operating condition of this supercooling unit (200), supercooling is suitably regulated the aperture of supercooling with expansion valve (223) simultaneously with compressor (221) running.

As shown in Figure 1, use the outdoor heat converter (222) to outdoor air heat release, condensation in supercooling with cold-producing medium with the supercooling of compressor (221) ejection from supercooling.This supercooling with outdoor heat converter (222) in the supercooling cold-producing medium of condensation, be depressurized during by supercooling with expansion valve (223), then, the 1st stream (211) of inflow supercooling usefulness heat exchanger (210).In 1st stream (211) of this supercooling with heat exchanger (210), supercooling is evaporated with the cold-producing medium heat absorption of cold-producing medium from the 2nd stream (212).This supercooling with heat exchanger (210) in the supercooling of evaporation be inhaled into supercooling with compressor (221) with cold-producing medium, be compressed.

As mentioned above, controller (240) is controlled the capacity of supercooling with compressor (221) according to the outer temperature degree of input.Here, with reference to Fig. 6 the control action of controller (240) is illustrated.The control action of this controller (240), carry out repeatedly (for example, every 30 seconds) at regular intervals.

At first, after the control beginning, in step ST1, calculate the value that deducts the target chilling temperature of in the configuration part (241) of controller (240), setting (Eom) with the detected temperatures (Tout) of refrigerant temperature sensors (236).In the present embodiment, as shown in Figure 7, set above-mentioned target chilling temperature (Eom).Specifically, when outer temperature degree smaller or equal to 25 ℃, when low, target chilling temperature (Eom) is set at 25 ℃, when outer temperature degree more than or equal to 40 ℃, when higher, target chilling temperature (Eom) is set at 0 ℃.And the scope of temperature degree is in 25 ℃ to 40 ℃ the scope outside, and target chilling temperature (Eom) is set to 0 ℃ from 25 ℃, sets lowlyer.In addition, the setting value for above-mentioned target chilling temperature (Eom) is not limited thereto.

In above-mentioned steps ST1, when the difference of detected temperatures (Tout) and target chilling temperature (Eom) is " discontented-1.0 ", transfer to step ST2, when being " surpassing+1.0 ", transfer to step ST3, when being " 1.0～+ 1.0 ", to return, control finishes.That is to say,, when refrigerating capacity etc. are excessive, transfer to step ST2,, when refrigerating capacity etc. are not enough, transfer to step ST3 when the refrigerant cools deficiency of refrigerating plant (10) when the cold-producing medium of above-mentioned refrigerating plant (10) is cooled excessively.And above-mentioned " 1.0～+ 1.0 " scope for not changing the no change zone of supercooling with the operating frequency of compressor (221), for example, can switch to this setting range " 1.5～+ 1.5 " and " 2.0～+ 2.0 ".At that time, the setting value of " discontented-1.0 " and " surpassing+1.0 " is also switched thereupon.

In above-mentioned steps ST2, judge whether supercooling is low-limit frequency with the operating frequency of compressor (221), is low-limit frequency if be judged to be, and then returns, and control finishes, and is not low-limit frequency if be judged to be, and then transfers to step ST4.In this step ST4, by the control part (242) of controller (240), with the operating frequency reduction one-level of supercooling with compressor (221).So, because the refrigerant cools temperature of refrigerating plant (10) rises, therefore can allow corresponding suitable abilities that are declined to become and load such as refrigerating capacity for superfluous state.

In above-mentioned steps ST3, judge whether supercooling is highest frequency with the operating frequency of compressor (221), is highest frequency if be judged to be, and then returns, and control finishes, and is not highest frequency if be judged to be, and then transfers to step ST5.In this step ST5, by the control part (242) of controller (240), with the operating frequency rising one-level of supercooling with compressor (221).So, because the refrigerant cools temperature of refrigerating plant (10) descends, therefore can allow corresponding suitable abilities that increase to and load such as refrigerating capacity for not enough state.In addition, in the present embodiment, can be with supercooling 20 grades of operating frequency change with compressor (221).

And, when can not correctly detect supercooling because of the fault of above-mentioned refrigerant temperature sensors (236) etc. the time with the detected temperatures of cold-producing medium, in step ST1, calculate the value that deducts the target chilling temperature (Eom) of configuration part (241) with the design temperature (Tout) of the detected pressures of suction pressure sensor (234) decision.Control after this is the same with above-mentioned control content.

The effect of-embodiment-

As mentioned above, according to present embodiment, because in supercooling unit (200), according to being the outer temperature degree that is arranged on the detected value of the sensor in this supercooling unit (200), promptly carry out the running control of supercooling with compressor (221) according to the information that in supercooling unit (200), obtains, adjust the chilling temperature of the cold-producing medium of refrigerating plant (10), even therefore and between the refrigerating plant (10) of outdoor unit (11) and air-conditioning unit (12) etc. do not carry out giving and accepting of signal etc., also can carry out suitable running according to the load condition of air-conditioning unit (12) etc.Therefore, in the time of in above-mentioned supercooling unit (200) being installed in refrigerating plant (10), need only the 1st, the 2nd hydraulic fluid side connecting pipe (21,22) that the refrigerant passage (205) of supercooling unit (200) is connected refrigerating plant (10), the communication wiring in order to the signal of giving and accepting between refrigerating plant (10) and supercooling unit (200) needn't be set.

Its result uses present embodiment, can cut down the operation number when being installed in supercooling unit (200) in the refrigerating plant (10), the accident that the people when can also possible trouble preventing because of misroute etc. operation to be set causes for fault.

And, because above-mentioned controller (240) carries out the running control of supercooling with compressor (221) according to the difference according to the target chilling temperature (Eom) of the detected temperatures (Tout) of cold-producing medium and the decision of outer temperature degree, so this information that also can only be used in the interior acquisition of supercooling unit (200) is correctly carried out the adjustment of refrigerating capacity.

And, even when above-mentioned refrigerant temperature sensors (236) is an abnormality, in the time of can not detecting, owing to will being used as the detected temperatures of cold-producing medium with the design temperature that the saturation temperature (TG) of cold-producing medium determines, so can further correctly carry out the adjustment of refrigerating capacity according to the supercooling in the detected pressures (LP) that is arranged on the suction pressure sensor (234) in the supercooling unit (200).

Here, for the signal of between supercooling unit (200) and refrigerating plant (10), giving and accepting, not only need communications connector (interface), and also need communications connector for refrigerating plant (10) for supercooling unit (200).Therefore, also have such problem:, can not use supercooling unit (200) arbitrarily for having limited the machine of refrigerating plant applicatory (10) from the supercooling unit (200) of refrigerating plant (10) to running control input signal.

And the supercooling unit (200) of present embodiment, do not need fully and refrigerating plant (10) between signal give and accept, to being the not restriction of refrigerating plant (10) of mounting object.Therefore, can improve the scope of application of supercooling unit (200) widely.

The variation 1 of-embodiment-

This variation 1 is for replacing the control of supercooling with compressor (221) by the control supercooling with the operating frequency of the outdoor fan (230) of outdoor heat converter (222), adjusts supercooling supercooling in the heat exchanger (210) example of the flow of cold-producing medium.That is to say that the outdoor fan of this variation (230) can come the change capacity by the operating frequency that changes fan motor.

Specifically, if allow the operating frequency of above-mentioned outdoor fan (230) descend, then supercooling is risen with the high-pressure in the refrigerant loop (220), and supercooling increases with the internal circulating load of cold-producing medium.That is to say that above-mentioned supercooling increases with the flow of the supercooling in the heat exchanger (210) with cold-producing medium.So, because supercooling increases with the heat exchange amount between the cold-producing medium of cold-producing medium and refrigerating plant (10) with the supercooling in the heat exchanger (210), therefore the chilling temperature of the cold-producing medium of refrigerating plant (10) descends, the increases such as refrigerating capacity of air-conditioning unit (12).On the contrary, if allow the operating frequency of above-mentioned outdoor fan (230) increase, then supercooling descends with the high-pressure in the refrigerant loop (220), and supercooling reduces with the internal circulating load of cold-producing medium.That is to say that above-mentioned supercooling reduces with the flow of the supercooling in the heat exchanger (210) with cold-producing medium.So, because supercooling reduces with the heat exchange amount between the cold-producing medium of cold-producing medium and refrigerating plant (10) with the supercooling in the heat exchanger (210), therefore the chilling temperature of the cold-producing medium of refrigerating plant (10) rises, the declines such as refrigerating capacity of air-conditioning unit (12).

In this variation, the control action of controller (240) is as follows.In the step ST2 of Fig. 6, judge whether the operating frequency of above-mentioned outdoor fan (230) is highest frequency, be highest frequency if be judged to be, then to return, control finishes, and is not highest frequency if be judged to be, and then transfers to step ST4.In this step ST4,, make the operating frequency rising one-level of outdoor fan (230) by the control part (242) of controller (240).So, because the refrigerant cools temperature of refrigerating plant (10) rises, therefore can allow corresponding suitable abilities that are declined to become and load such as refrigerating capacity for superfluous state.

In above-mentioned steps ST3, judge whether the operating frequency of outdoor fan (230) is low-limit frequency, be low-limit frequency if be judged to be, then to return, control finishes, and is not low-limit frequency if be judged to be, and then transfers to step ST5.In this step ST5,, make the operating frequency decline one-level of outdoor fan (230) by the control part (242) of controller (240).So, because the refrigerant cools temperature of refrigerating plant (10) reduces, therefore can allow corresponding suitable abilities that increase to and load such as refrigerating capacity for not enough state.Other structure, effect and effect are the same with embodiment.

In addition, the present invention also can adjust cold-producing medium is used in supercooling with the supercooling in the heat exchanger (210) flow with compressor (221) and outdoor fan (230) two sides by the control supercooling.At this moment, the controlled raising of the chilling temperature of cold-producing medium.

The variation 2 of-embodiment-

This variation 2 be with the cooling of the foregoing description with the structural change of fluid circuit example, do not illustrate among the figure.Constituted cooling by refrigerant loop in the above-described embodiments and used fluid circuit, the chilled(cooling) water return (CWR) by flow of cooling water in this variation constitutes.Specifically, this chilled(cooling) water return (CWR) constitutes and comprises supercooling with heat exchanger (210) and water pump, the cooling water of cooling tower by this water pump and supercooling with heat exchanger (210) between circulation.And, to use in the heat exchanger (210) in above-mentioned supercooling, the cold-producing medium heat exchange of cooling water and refrigerant passage (205) is with this refrigerant cools.That is to say that use in the fluid circuit in the cooling of this variation, cooling water flows with fluid as cooling.

In this variation, for example, when outer temperature degree is higher, by allowing the operating frequency of water pump increase, supercooling is increased with the flow of the cooling water in the heat exchanger (210), the chilling temperature of cold-producing medium is descended, improve the refrigerating capacity of air-conditioning unit (12) etc.On the contrary, when outer temperature degree is low,, supercooling is reduced with the flow of the cooling water in the heat exchanger (210), the chilling temperature of cold-producing medium is risen, reduce the refrigerating capacity of air-conditioning unit (12) etc. by allowing the operating frequency of water pump reduce.Other structure, effect and effect are the same with embodiment.

In addition, in this variation, the configuration part (241) of controller (240) also can replace outer temperature degree, will be in the temperature of the cooling water after supercooling is cooled in heat exchanger (210) as the ambient conditions of supercooling with heat exchanger (210).

(other embodiment)

In the above-described embodiments, when refrigerant temperature sensors (236) is unusual, any one of the detected temperatures (Ti) of the detected pressures (LP) of suction pressure sensor (234) and inlet temperature sensor (235) is input to the control part (242) of controller (240), also can have imported two detected values.At that time, at first, when refrigerant temperature sensors (236) is unusual, use the detected pressures (LP) of suction pressure sensor (234), when refrigerant temperature sensors (236) and suction pressure sensor (234) two sides are unusual, use the detected temperatures (Ti) of inlet temperature sensor (235).

And, in the foregoing description and its variation, also can not import the detected temperatures (Tout) of refrigerant temperature sensors (236), only the detected pressures (LP) of suction pressure sensor (234) or the detected temperatures (Ti) of inlet temperature sensor (235) are input to control part (242).At this moment, no matter refrigerant temperature sensors (236) is normally undesired, all, control supercooling usefulness compressor (221) and outdoor fan (230) to be standard according to its detected pressures (LP) or the design temperature (Tout) of detected temperatures (Ti) decision and the difference of target chilling temperature (Eom).

And, if use in the refrigerant loop (220) in the supercooling of the foregoing description, No. four transfer valves etc. are set, reversibly constitute the words of cold-producing medium circulation, then can be by refrigerant passage (205) being connected on the gas side connecting pipe of the 1st gas side connecting pipe (23) and the 2nd gas side connecting pipe (24), with the cold-producing medium heating of refrigerating plant (10).Therefore, can prevent liquid towards each compressor of outdoor unit (11) (41 ...) so-called liquid flow backwards.So supercooling unit (200) involved in the present invention by reversibly constituting the cold-producing medium circulation of supercooling with refrigerant loop (220), can switch the cooling device or the heater of cold-producing medium as required.

In addition, the foregoing description is for being suitable for example of the present invention, and the present invention does not painstakingly limit its suitable thing or its purposes scope.

(practicality)

As mentioned above, that cooling is delivered to the apparatus for supercooling of the cold-producing medium that utilizes unit from the thermal source unit of refrigerating plant is useful in the present invention.

In the supercooling unit (200) of present embodiment, also can with the both sides of heat exchanger (210) temperature sensor (237,238) be set, turn round the control supercooling with compressor (221) according to the detected value of these temperature sensors (237,238) in the supercooling in the refrigerant passage (205).

As shown in Figure 7, in refrigerant passage (205), than supercooling with heat exchanger (210) by the part of the other end, promptly the 1st refrigerant temperature sensors (237) is set in part by the end that is connected the 2nd hydraulic fluid side connecting pipe (22).And, in this refrigerant passage (205), than supercooling with heat exchanger (210) by the part of an end, promptly the 2nd refrigerant temperature sensors (238) is set in part by the end that is connected the 1st hydraulic fluid side connecting pipe (21).In this supercooling unit (200), the 1st refrigerant temperature sensors (237) constitutes the 1st refrigerant temperature detector, and the 2nd refrigerant temperature sensors (238) constitutes the 2nd refrigerant temperature detector.

Controller (240) to this variation is imported the detected value of the 1st refrigerant temperature sensors (237) and the detected value of the 2nd refrigerant temperature sensors (238).This controller (240) constitutes the detected value of supercooling with two refrigerant temperature sensors (237,238) in the running of compressor (221) is compared, deciding according to its comparative result is to continue the running of supercooling with compressor (221), still stops the running of supercooling with compressor (221).

Control action to this controller (240) is illustrated.

At first, if supercooling with the running of compressor (221) in the detected value of the 1st refrigerant temperature sensors (237) be lower than the detected value of the 2nd refrigerant temperature sensors (238), then just detect the refrigerant temperature of cooling off in heat exchanger (210) in supercooling by the 1st refrigerant temperature sensors (237).Therefore, at this moment, for example can judge as in the cold air operation, cold-producing medium just in refrigerant passage (205) from the 1st hydraulic fluid side connecting pipe (21) effluent to the 2nd hydraulic fluid side connecting pipe (22) side, controller (240) allows supercooling continue with the running of compressor (221).

On the other hand, if supercooling with the running of compressor (221) in the detected value of the 2nd refrigerant temperature sensors (238) be lower than the detected value of the 1st refrigerant temperature sensors (237), then just detect the refrigerant temperature of cooling off in heat exchanger (210) in supercooling by the 2nd refrigerant temperature sensors (238).Therefore, at this moment, for example can judge as in the running of the 2nd heating installation, cold-producing medium just in refrigerant passage (205) from the 2nd hydraulic fluid side connecting pipe (22) effluent to the 1st hydraulic fluid side connecting pipe (21) side, controller (240) allows supercooling stop with the running of compressor (221).

And, as if the detected value of the 1st refrigerant temperature sensors (237) and the detected value words much at one of the 2nd refrigerant temperature sensors (238) in the running of using compressor (221) in supercooling, then can judge for example as in the running of the 1st heating installation, cold-producing medium is not circulation in refrigerant passage (205), and controller (240) allows supercooling stop with the running of compressor (221).

In addition, in the controller (240) of this variation, also the difference of the detected value of the detected value of the 1st refrigerant temperature sensors (237) and the 2nd refrigerant temperature sensors (238) can be represented value as the circulation status of the cold-producing medium circulation status in the expression refrigerant passage (205).That is to say, if deduct the words of value for bearing of the detected value of the 2nd refrigerant temperature sensors (238) with the detected value of the 1st refrigerant temperature sensors (237), then owing to can judge the state that the detected value that is in the 1st refrigerant temperature sensors (237) is lower than the detected value of the 2nd refrigerant temperature sensors (238), so controller (240) allows supercooling continue with the running of compressor (221).And, if the value that deducts the detected value of the 2nd refrigerant temperature sensors (238) with the detected value of the 1st refrigerant temperature sensors (237) is the words more than 0 or 0, then owing to can judge the state that the detected value that is in the 1st refrigerant temperature sensors (237) is higher than the detected value of the 2nd refrigerant temperature sensors (238), perhaps both identical states, so controller (240) allow supercooling stop with compressor (221).

The variation 2 of-embodiment-

In the supercooling unit (200) of present embodiment, as shown in Figure 8, also can flowmeter (251) be set, according to the detected value running control supercooling compressor (221) of this flowmeter (251) in refrigerant passage (205).

In this supercooling unit (200), the detected value of flowmeter (251) is input to controller (240).Controller (240) judges according to the detected value of flowmeter (251) whether cold-producing medium circulating direction and cold-producing medium in the refrigerant passage (205) just circulate in refrigerant passage (205).That is to say that this controller (240) is represented value with the detected value of flowmeter (251) as the circulation status of the cold-producing medium circulation status in the expression refrigerant passage (205).

When judge supercooling with the running of compressor (221) in cold-producing medium just refrigerant passage (205) in from the 1st hydraulic fluid side connecting pipe (21) effluent during to the 2nd hydraulic fluid side connecting pipe (22) side, controller (240) allows the running continuation of supercooling with compressor (221).And, when judge supercooling with the running of compressor (221) in cold-producing medium just in refrigerant passage (205) from the 2nd hydraulic fluid side connecting pipe (22) effluent during to the 1st hydraulic fluid side connecting pipe (21) side, perhaps judge when not having cold-producing medium to circulate in refrigerant passage (205) in the running of supercooling with compressor (221), controller (240) allows supercooling stop with the running of compressor (221).

The variation 3 of-embodiment-

In the controller (240) of present embodiment, also can control the running of supercooling according to the detected value of outer air-temperature sensor (231) with compressor (221).

Action to controller (240) is illustrated.If the detected value of outer air-temperature sensor (231) surpasses set upper limit value (for example, 30 ℃), then can infer the cooling load that at refrigerator display case (13) and refrigerated display case (14), or uprise at the cold air load of air-conditioning unit (12).So, at this moment, controller (240), the starting supercooling continues the running of supercooling with compressor (221) with compressor (221) when supercooling is in the operating condition with compressor (221) when supercooling is in the halted state with compressor (221).In refrigerant passage (205), flow to the cold-producing medium of the 2nd hydraulic fluid side connecting pipe (22), in supercooling usefulness heat exchanger (210), after the cooling, be provided for refrigerator display case (13) etc. from the 1st hydraulic fluid side connecting pipe (21).

And if the lower limit that the detected value of outer air-temperature sensor (231) is lower than regulation (for example, 20 ℃) words, then can infer the cooling load that at refrigerator display case (13) and refrigerated display case (14), or at the cold air of air-conditioning unit (12) load step-down, can judge does not need the running of supercooling with compressor (221).So at this moment, controller (240) makes supercooling still stop with compressor (221), when being in the operating condition with compressor (221), supercooling stops supercooling compressor (221) when supercooling is in the halted state with compressor (221).

The variation 4 of-embodiment-

In the controller (240) of present embodiment, also can be only according to the variation of the detected value of refrigerant temperature detector (236), control the running of supercooling with compressor (221).The controller of this variation (240) is represented value with the detected value variation of refrigerant temperature detector (236) as the circulation status of the cold-producing medium circulation status in the expression refrigerant passage (205).

Action to controller (240) is illustrated.When the moment from supercooling is started with compressor (221), when the detected value of refrigerant temperature detector (236) reduces gradually, can judge cold-producing medium just in refrigerant passage (205) from the 1st hydraulic fluid side connecting pipe (21) effluent to the 2nd hydraulic fluid side connecting pipe (22) side.So at this moment, controller (240) allows supercooling continue with the running of compressor (221).

On the other hand, even when starting supercooling compressor (221), when the detected value of refrigerant temperature detector (236) does not reduce yet, can judge cold-producing medium just in refrigerant passage (205) from the 2nd hydraulic fluid side connecting pipe (22) effluent to the 1st hydraulic fluid side connecting pipe (21) side, perhaps in refrigerant passage (205), do not have flow of refrigerant.So at this moment, controller (240) allows supercooling stop with compressor (221).

And, when the moment from allowing supercooling stop with compressor (221), when the detected value of refrigerant temperature detector (236) rises gradually, can judge cold-producing medium just in refrigerant passage (205) from the 1st hydraulic fluid side connecting pipe (21) effluent to the 2nd hydraulic fluid side connecting pipe (22) side.So at this moment, controller (240) allows supercooling start once more with compressor (221).

On the other hand, when even supercooling is under the halted state with compressor (221), when the detected value of refrigerant temperature detector (236) does not rise yet, can judge cold-producing medium just in refrigerant passage (205) from the 2nd hydraulic fluid side connecting pipe (22) effluent to the 1st hydraulic fluid side connecting pipe (21) side, perhaps in refrigerant passage (205), do not have flow of refrigerant.So at this moment, controller (240) allows supercooling still keep halted state with compressor (221).

The variation 5 of-embodiment-

In the controller (240) of present embodiment, also can control the running of supercooling according to supercooling with the temperature difference of the supercooling in the entrance and exit of the 1st stream (211) of heat exchanger (210) with cold-producing medium with compressor (221).

As shown in Figure 9, the supercooling unit (200) in this variation is provided with the 1st supercooling refrigerant temperature sensors (252) and the 2nd supercooling refrigerant temperature sensors (253).Use in the refrigerant loop (220) in supercooling, the 1st supercooling is arranged on the positive front of supercooling with the 1st stream (211) of heat exchanger (210) with refrigerant temperature sensors (252), detects the temperature that cold-producing medium is used in the supercooling that will flow into the 1st stream (211).And the 2nd supercooling is arranged on the positive back of supercooling with the 1st stream (211) of heat exchanger (210) with refrigerant temperature sensors (253), detect the supercooling refrigerant temperature after the 1st stream (211) has just flowed out.And the controller of this variation (240) is represented value with the difference of the detected value of refrigerant temperature sensors (253) as the circulation status of the cold-producing medium circulation status in the expression refrigerant passage (205) with the detected value and the 2nd supercooling of refrigerant temperature sensors (252) with the 1st supercooling.

Action to controller (240) is illustrated.In the running of supercooling with compressor (221), when the 2nd supercooling is higher than the 1st supercooling with the detected value of refrigerant temperature sensors (252) with the detected value of refrigerant temperature sensors (253) (, deduct the 1st supercooling with the value of the detected value of refrigerant temperature sensors (252) during with the 2nd supercooling with the detected value of refrigerant temperature sensors (253) for just (+)), can judge cold-producing medium just in refrigerant passage (205) from the 1st hydraulic fluid side connecting pipe (21) effluent to the 2nd hydraulic fluid side connecting pipe (22) side.So at this moment, controller (240) allows supercooling continue with the running of compressor (221).

On the other hand, in the running of supercooling with compressor (221), be lower than the detected value of the 1st supercooling usefulness refrigerant temperature sensors (252) with the detected value of refrigerant temperature sensors (253) when the 2nd supercooling, or both are not not (promptly simultaneously, deducting the 1st supercooling with the 2nd supercooling with the detected value of refrigerant temperature sensors (253) is 0 or 0 when following with the value of the detected value of refrigerant temperature sensors (252)), can judge cold-producing medium just in refrigerant passage (205) from the 2nd hydraulic fluid side connecting pipe (22) effluent to the 1st hydraulic fluid side connecting pipe (21) side, perhaps in refrigerant passage (205), do not have flow of refrigerant.So at this moment, controller (240) allows supercooling stop with compressor (221).

The variation 6 of-embodiment-

In the controller (240) of present embodiment, also can control the running of supercooling only according to the detected value of suction pressure sensor (234) with compressor (221).The detected value of suction pressure sensor (234) and supercooling use the evaporating pressure of cold-producing medium almost equal with the refrigerant pressure in the 1st stream (211) of heat exchanger (210), i.e. supercooling.Therefore, in this variation, suction pressure sensor (234) constitutes the evaporating pressure detector.And the controller of this variation (240) is represented value with the detected value of suction pressure sensor (234) as the circulation status of the cold-producing medium circulation status in the expression refrigerant passage (205).

Action to controller (240) is illustrated.Detected value as if suction pressure sensor (234) in the running of using compressor (221) in supercooling (for example surpasses the specified standard value, 0.2MPa) words, then can judge supercooling with the 1st stream (211) of heat exchanger (210) in supercooling evaporate with cold-producing medium, cold-producing medium just flows in refrigerant passage (205).So at this moment, controller (240) allows supercooling continue with the running of compressor (221).

On the other hand, if the detected value of suction pressure sensor (234) is smaller or equal to the words of above-mentioned standard value in the running of supercooling usefulness compressor (221), then can judge supercooling with the 1st stream (211) of heat exchanger (210) in supercooling almost do not evaporate with cold-producing medium, in refrigerant passage (205), do not have flow of refrigerant.So at this moment, controller (240) allows supercooling stop with compressor (221).

The variation 7 of-embodiment-

In the controller (240) of present embodiment, also can only control the running of supercooling with the difference of the evaporating temperature Tg of cold-producing medium with compressor (221) according to the detected value Tout and the supercooling of refrigerant temperature sensors (236).The controller of this variation (240), with the detected value Tout of refrigerant temperature sensors (236) and supercooling with the difference of the evaporating temperature Tg of cold-producing medium as representing that the circulation status of the cold-producing medium circulation status in the refrigerant passage (205) represents value.

Action to controller (240) is illustrated.In the running of supercooling with compressor (221), when the detected value Tout with refrigerant temperature sensors (236) with the value of the evaporating temperature Tg of cold-producing medium smaller or equal to the specified standard value (for example deducts supercooling, 15 ℃) time, can judge cold-producing medium just in refrigerant passage (205) from the 1st hydraulic fluid side connecting pipe (21) effluent to the 2nd hydraulic fluid side connecting pipe (22) side.So at this moment, controller (240) allows supercooling continue with the running of compressor (221).

On the other hand, in the running of supercooling with compressor (221), when the detected value Tout with refrigerant temperature sensors (236) deducts supercooling with the value of the evaporating temperature Tg of cold-producing medium during smaller or equal to above-mentioned standard value, can judge cold-producing medium just in refrigerant passage (205) from the 2nd hydraulic fluid side connecting pipe (22) effluent to the 1st hydraulic fluid side connecting pipe (21) side, perhaps in refrigerant passage (205), do not have flow of refrigerant.So at this moment, controller (240) allows supercooling stop with compressor (221).

The variation 8 of-embodiment-

In the controller (240) of present embodiment, also can only control the running of supercooling with compressor (221) according to the detected value of refrigerant temperature detector (236).The controller of this variation (240) is represented value with the detected value of refrigerant temperature detector (236) as the circulation status of the cold-producing medium circulation status in the expression refrigerant passage (205).

Action to controller (240) is illustrated.When supercooling surpasses the specified standard value with the detected value of refrigerant temperature detector (236) in the stopping of compressor (221), can infer that the refrigerant temperature of utilizing side of delivering to refrigerator display case (13) etc. from outdoor unit (11) uprises, the cooling capacity of refrigerator display case (13) etc. is a bit not enough.So, at this moment, controller (240) starting supercooling compressor (221).

On the other hand, when in supercooling with the detected value of refrigerant temperature detector (236) in the stopping of compressor (221) during smaller or equal to the specified standard value, can infer that to deliver to the refrigerant temperature of utilizing side of refrigerator display case (13) etc. from outdoor unit (11) so not high, guarantee the cooling capacity of refrigerator display case (13) etc. fully.So at this moment, controller (240) still allows supercooling stop with compressor (221).

The variation 9 of-embodiment-

In the controller (240) of present embodiment, also can control the running of supercooling usefulness compressor (221) according to the difference of the detected value of the detected value of refrigerant temperature detector (236) and outer air-temperature sensor (231).The controller of this variation (240) is represented value with the difference of the detected value of the detected value of refrigerant temperature detector (236) and outer air-temperature sensor (231) as the circulation status of representing the cold-producing medium circulation status in the refrigerant passage (205).

Action to controller (240) is illustrated.Though when at refrigerant passage (205) inner refrigerant just from the 1st hydraulic fluid side connecting pipe (21) effluent during to the 2nd hydraulic fluid side connecting pipe (22) side, in outdoor heat converter (44) in outdoor air heat release condensed refrigerant flows into refrigerant passage (205), still the phenomenon that this refrigerant temperature is lower than the temperature of outdoor air can not appear.Therefore, in supercooling with in the stopping of compressor (221), when the value of the detected value of air-temperature sensor (231) surpasses the specified standard value outside the detected value with refrigerant temperature detector (236) deducts, can judge cold-producing medium just in refrigerant passage (205) from the 1st hydraulic fluid side connecting pipe (21) effluent to the 2nd hydraulic fluid side connecting pipe (22) side.So, at this moment, controller (240) starting supercooling compressor (221).

On the other hand, in supercooling with in the stopping of compressor (221), when the value of the detected value of air-temperature sensor (231) is smaller or equal to the specified standard value outside the detected value with refrigerant temperature detector (236) deducts, can judge cold-producing medium just in refrigerant passage (205) from the 2nd hydraulic fluid side connecting pipe (22) effluent to the 1st hydraulic fluid side connecting pipe (21) side, perhaps in refrigerant passage (205), do not have flow of refrigerant.So at this moment, controller (240) allows supercooling still keep halted state with compressor (221).

The variation 10 of-embodiment-

In the supercooling unit (200) of present embodiment, supercooling also can constitute with refrigerant loop (220) can allow the cold-producing medium Natural Circulation.

As shown in figure 10, use in the refrigerant loop (220), supercooling is arranged in than supercooling with outdoor heat converter (222) leans on last position with heat exchanger (210) in the supercooling of this variation.And, be provided with by-pass line (224) with refrigerant loop (220) in this supercooling.This by-pass line (224), one end are connected the suction side of supercooling with compressor (221), and the other end is connected the ejection side of supercooling with compressor (221).And, be provided with the check valve (225) that only allows cold-producing medium to flow to the other end from the one end at by-pass line (224).

Use in the refrigerant loop (220) in this supercooling,, also can supercooling be circulated with cold-producing medium by making outdoor fan (230) running even supercooling is in the halted state with compressor (221).Specifically, after making outdoor fan (230) running, use in the outdoor heat converter (222) in supercooling, cold-producing medium is to outdoor air heat release, condensation.The supercooling cold-producing medium of condensation in supercooling usefulness outdoor heat converter (222) because of gravity flows down, flows into 1st stream (211) of supercooling with heat exchanger (210) by the supercooling that is set at full open position with expansion valve (223).In 1st stream (211) of supercooling with heat exchanger (210), supercooling is evaporated with the cold-producing medium heat absorption of cold-producing medium from the 2nd stream (212).At the supercooling supercooling cold-producing medium that evaporates in the heat exchanger (210), return supercooling with outdoor heat converter (222), with outdoor air heat exchange, condensation once more by by-pass line (224).

When supercooling unit (200) starts, the controller of this variation (240), at first, and priming chamber's external fan (230), whether judge at the state of operation office for train receiving departure external fan (230) allows supercooling with compressor (221) starting.That is to say that controller (240) is in and must then only outdoor fan (230) be started flowing into the state of the refrigerant cools in the refrigerant passage (205) if judge under the state that still allows supercooling stop with compressor (221).Behind priming chamber's external fan (230), supercooling with cold-producing medium in refrigerant passage (205) Natural Circulation, supercooling with heat exchanger (210) in the cold-producing medium of the 2nd stream (212) by the supercooling refrigerant cools.Controller (240) only makes the state with this outdoor fan (230) running continue in official hour (for example, 5 minutes), then, judges whether the cooling that flows into the cold-producing medium in the refrigerant passage (205) is not enough.And if flow into the cooling deficiency of the cold-producing medium in the refrigerant passage (205), controller (240) just allows supercooling start with compressor (221) so.

After the starting supercooling is with compressor (221), carry out kind of refrigeration cycle in refrigerant loop (220) in supercooling.And if the cooling of this cold-producing medium does not have deficiency, controller (240) just only allows the running of outdoor fan (230) continue under the state that allows supercooling still keep stopping with compressor (221) so.

In this variation, only under the running by outdoor fan (230) only allows the situation of supercooling with the cold-producing medium Natural Circulation, when the cooling of heat source side cold-producing medium is not enough, start supercooling compressor (221).Therefore, do not need to start supercooling with compressor (221),, can cut down the number of starts of supercooling with compressor (221) with the phenomenon of supercooling with compressor (221) starting even can avoid yet.Its result can shorten supercooling with the duration of runs of compressor (221) under unsettled transition state, can improve the reliability of supercooling with compressor (221).

The variation 11 of-embodiment-

The supercooling unit (200) of present embodiment also can replace supercooling refrigerant loop (220), and the chilled water circuit that the cold water circulation is set is as the cooling fluid circuit.In this chilled water circuit, for example, about 5 ℃ the water of lower temperature circulates.The supercooling of this variation with heat exchanger (210) in, chilled water circuit is connected on its 1st stream (211), allow the interior mobile cold-producing medium heat exchange of interior the flowing cold water of the 1st stream (211) and the 2nd stream (212).

In addition, the foregoing description is to be suitable for ideal example of the present invention in nature, and the present invention does not painstakingly limit its suitable thing or its purposes scope.

(practicality)

As mentioned above, the present invention delivers to the refrigeration of utilizing unit to cooling from the thermal source unit of refrigerating plant The apparatus for supercooling of agent is useful.

Claims

1, a kind of apparatus for supercooling, be installed in and make cold-producing medium at the thermal source unit (11) that connects by connecting pipe with utilize circulation between the unit (12,13,14) to carry out in the refrigerating plant (10) that steam compression type refrigerating circulates, to deliver to the refrigerant cools of the above-mentioned refrigerating plant (10) that utilizes unit (12,13,14) from thermal source unit (11), it is characterized in that:

Comprise: refrigerant passage (205), be connected on the hydraulic fluid side connecting pipe of above-mentioned refrigerating plant (10),

Cooling is with fluid circuit (220), comprise allowing cold-producing medium and the cooling of above-mentioned refrigerant passage (205) with the fluid thermal exchange, with the supercooling of the refrigerant cools of above-mentioned refrigerant passage (205) with heat exchanger (210), and

Controller (240) is adjusted the refrigerant cools temperature of above-mentioned supercooling with the refrigerant passage (205) in the heat exchanger (210) according to supercooling with the ambient conditions of heat exchanger (210).

2, apparatus for supercooling according to claim 1 is characterized in that:

Above-mentioned controller (240), comprise control part (242), this control part (242) is according to being adjusted in flow that supercooling use in heat exchanger (210) mobile cooling usefulness fluid with the predefined supercooling of the ambient conditions of heat exchanger (210) institute with the cold-producing medium target chilling temperature of the refrigerant passage (205) in the heat exchanger (210) according to supercooling.

3, apparatus for supercooling according to claim 2 is characterized in that:

Above-mentioned cooling fluid circuit, the supercooling that is to have volume-variable is with compressor (221) and heat source side heat exchanger (222), the supercooling usefulness refrigerant loop (220) that circulates and carry out the steam compression type refrigerating circulation with cold-producing medium with the supercooling of fluid as cooling;

The control part (242) of above-mentioned controller (240) is controlled the operating frequency of above-mentioned supercooling with compressor (221) according to the target chilling temperature, is adjusted in cold-producing medium is used in above-mentioned supercooling with the supercooling of flowing in the heat exchanger (210) flow.

4, apparatus for supercooling according to claim 2 is characterized in that:

The control part (242) of above-mentioned controller (240), control the operating frequency of the fan (230) of above-mentioned heat source side heat exchanger (222) according to the target chilling temperature, be adjusted in above-mentioned supercooling with the flow of the cooling of flowing in the heat exchanger (210) with cold-producing medium.

5, apparatus for supercooling according to claim 3 is characterized in that:

The control part (242) of above-mentioned controller (240), the refrigerant temperature of the refrigerant passage (205) that is cooled in heat exchanger (210) according to the target chilling temperature with in supercooling poor controlled the operating frequency of supercooling with compressor (221).

6, apparatus for supercooling according to claim 3 is characterized in that:

The control part (242) of above-mentioned controller (240), the design temperature that is determined with the suitable saturation temperature of low pressure of cold-producing medium with the supercooling of refrigerant loop (220) according to the target chilling temperature with according to supercooling poor controlled the operating frequency of supercooling with compressor (221).

7, apparatus for supercooling according to claim 3 is characterized in that:

The control part (242) of above-mentioned controller (240), the design temperature that is determined with the suction people temperature of compressor (221) according to the target chilling temperature with according to supercooling poor controlled the operating frequency of supercooling with compressor (221).

8, apparatus for supercooling according to claim 4 is characterized in that:

The control part (242) of above-mentioned controller (240), the refrigerant temperature of the refrigerant passage (205) that is cooled in heat exchanger (210) according to the target chilling temperature with in supercooling poor controlled the operating frequency of fan (230).

9, apparatus for supercooling according to claim 4 is characterized in that:

The control part (242) of above-mentioned controller (240), the design temperature that is determined with the suitable saturation temperature of low pressure of cold-producing medium with the supercooling of refrigerant loop (220) according to the target chilling temperature with according to supercooling poor controlled the operating frequency of fan (230).

10, apparatus for supercooling according to claim 4 is characterized in that:

The control part (242) of above-mentioned controller (240), the design temperature that is determined with the suction people temperature of compressor (221) according to the target chilling temperature with according to supercooling poor controlled the operating frequency of fan (230).

11, apparatus for supercooling according to claim 1 is characterized in that:

Above-mentioned supercooling is outer temperature degree with the ambient conditions of heat exchanger (210).

12, apparatus for supercooling according to claim 1 is characterized in that:

Above-mentioned supercooling is the refrigerant flow of refrigerant passage (205) with the ambient conditions of heat exchanger (210).

13, apparatus for supercooling according to claim 1 is characterized in that:

The above-mentioned supercooling ambient conditions of heat exchanger (210), be supercooling with heat exchanger (210) in the refrigerant temperature of refrigerant passage (205) before the cooling, perhaps in be cooled in heat exchanger (210) refrigerant temperature of refrigerant passage (205) afterwards of supercooling.

14, apparatus for supercooling according to claim 1 is characterized in that:

Above-mentioned cooling fluid circuit is the supercooling usefulness refrigerant loop (220) that circulates and carry out the steam compression type refrigerating circulation with cold-producing medium with the supercooling of fluid as cooling;

The ambient conditions of above-mentioned supercooling usefulness heat exchanger (210) is low pressure or the high-pressure of supercooling with the usefulness of the supercooling in the refrigerant loop (220) cold-producing medium.

15, apparatus for supercooling according to claim 1 is characterized in that:

Above-mentioned supercooling is with the ambient conditions of heat exchanger (210), for using in supercooling in the heat exchanger (210) the temperature of the supercooling after the refrigerant cools of refrigerant passage (205) with cold-producing medium.