CN215412600U - Ultralow temperature refrigerating system and ultralow temperature refrigeration house - Google Patents
Ultralow temperature refrigerating system and ultralow temperature refrigeration house Download PDFInfo
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- CN215412600U CN215412600U CN202120944644.1U CN202120944644U CN215412600U CN 215412600 U CN215412600 U CN 215412600U CN 202120944644 U CN202120944644 U CN 202120944644U CN 215412600 U CN215412600 U CN 215412600U
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Abstract
The application discloses an ultralow-temperature refrigeration system and an ultralow-temperature cold storage, wherein the ultralow-temperature refrigeration system is provided with a primary refrigeration loop and a secondary refrigeration loop, when the temperature in the cold storage is higher in a high-temperature initial stage, the primary refrigeration loop is only started to refrigerate and precool the cold storage, when the temperature of the cold storage is reduced to a proper low temperature, the cold storage is converted into a cascade system to run, the primary refrigeration loop and the secondary refrigeration loop are started simultaneously, the primary refrigeration loop condenses the secondary refrigeration loop, and the secondary refrigeration loop refrigerates the cold storage; can avoid directly starting one-level, second grade refrigeration circuit under freezer high temperature environment like this, cause the compressor of second grade refrigeration circuit to appear transshipping, overheated trouble such as to, this application is through setting up the hot-air pipe, the heating condensation is in refrigeration oil in the second evaporimeter makes its viscosity reduce mobility and increases, and the high-pressure steam has avoided refrigeration oil to be deposited in the evaporimeter by the condensation on taking oil back to the second compressor simultaneously, leads to the oil return difficulty.
Description
Technical Field
The utility model belongs to the technical field of refrigeration, and particularly relates to an ultralow-temperature refrigeration system and an ultralow-temperature cold storage.
Background
The refrigeration system is used as the core component of the cold storage, the operation state of the refrigeration system directly influences the refrigeration effect of the cold storage, the refrigeration system of the existing cold storage conventionally adopts a binary cascade refrigeration system, the refrigeration of the binary cascade refrigeration system comprises a high-temperature refrigeration system and a low-temperature refrigeration system, the high-temperature grade common R22, R404A, R507, low-temperature grade common R23, R508 and the like of the refrigerants in the two refrigeration systems are adopted, in the refrigeration process, the compressors of the two refrigeration systems are operated simultaneously, the high-temperature refrigeration system condenses the low-temperature refrigeration system, and then the low-temperature refrigeration system carries out refrigeration and cooling on the cold storage, but because the operation temperature ranges of the two refrigerants are different, when the cold storage is directly cooled by the low-temperature grade (such as R23) due to higher temperature in the cold storage during the high-temperature initial operation of the cold storage, the pressure of the refrigerants is higher, and the evaporation pressure in the low-temperature refrigeration system is overhigh, exceeding the operation range of the compressor, the long-term high-load operation of the compressor easily causes the overload and ultrahigh-temperature operation of the compressor, and the damage to the compressor;
in addition, the evaporator of the low-temperature stage refrigeration loop operates in an ultralow temperature environment for a long time (-45 to-80 ℃), once the refrigerant oil of the low-temperature stage compressor enters the evaporator, the refrigerant oil is easy to condense, the poor oil fluidity is easy to accumulate in the evaporator, the heat exchange effect of the system evaporator is poor, the oil return of the system is difficult, and finally the low-temperature stage compressor is caused to have oil shortage alarm or even blocking fault.
SUMMERY OF THE UTILITY MODEL
Objects of the utility model
In order to overcome the above disadvantages, the present invention provides an ultra-low temperature refrigeration system and an ultra-low temperature refrigerator, so as to solve the technical problems that during the refrigeration process of the conventional binary cascade refrigeration system, during the high-temperature initial operation of the refrigerator, the compressor in the low temperature refrigeration system is easily overloaded and damaged, and the refrigerant of the compressor of the low temperature stage refrigeration system is easily condensed and accumulated in the evaporator in the low temperature environment for a long time, so that the heat exchange effect of the system evaporator is poor and the oil return of the system is difficult.
(II) technical scheme
In order to achieve the above object, one aspect of the present application provides the following technical solutions:
an ultra-low temperature refrigerating system and an ultra-low temperature refrigerator, comprising: one-level refrigeration circuit, second grade refrigeration circuit, air-cooler and controller, one-level, second grade refrigeration circuit are connected with the controller and form the cascade through evaporative condenser, and the controller is used for opening one-level refrigeration circuit or opening one-level refrigeration circuit and second grade refrigeration circuit simultaneously alone under predetermined freezer temperature, and wherein, one-level refrigeration circuit has set up: first evaporimeter, condenser and first compressor, second grade refrigerating circuit has set up on the way: the second evaporator, the second compressor and the oil separator are connected in parallel, a hot air pipe is further connected to the secondary refrigeration loop in parallel, one end of the hot air pipe is connected with an outlet of the oil separator, the other end of the hot air pipe is connected with an inlet of the second evaporator and used for guiding hot air discharged by the oil separator into the second evaporator to melt the frozen oil condensed on the second evaporator and flow back to the second compressor along the secondary refrigeration loop, and the first evaporator and the second evaporator are both arranged corresponding to the air cooler;
the refrigeration system is provided with a primary refrigeration loop and a secondary refrigeration loop, in the primary stage of refrigeration, when the temperature in the refrigeration house is higher (such as higher than-10 ℃), the refrigeration house is refrigerated and precooled by only starting the primary refrigeration loop, when the temperature of the refrigeration house is reduced to proper low temperature (such as lower than-10 ℃), the refrigeration house is converted into a cascade system to operate, the primary refrigeration loop and the secondary refrigeration loop are started simultaneously, the primary refrigeration loop condenses the secondary refrigeration loop, the secondary refrigeration loop refrigerates the refrigeration house, so that the situation that the primary refrigeration loop and the secondary refrigeration loop are directly started under the high-temperature environment of the refrigeration house can be avoided, the pressure of a refrigerant in the secondary refrigeration loop is greatly influenced by the temperature of the refrigeration house, a second compressor in the secondary refrigeration loop needs overload operation, and the compressor is easily subjected to faults such as overload, overheat and the like, and the refrigeration system is provided with a hot air pipe, the refrigerant (freezing oil) condensed in the second evaporator is heated, so that the viscosity of the refrigerant is reduced, the mobility of the refrigerant is increased, meanwhile, the oil is brought back to the second compressor by high-pressure hot gas, and the technical problems of blockage, evaporator heat exchange performance reduction and system oil return difficulty caused by the fact that the freezing oil is condensed and accumulated in the evaporator are solved.
In some embodiments, the hot air pipe is provided with the electromagnetic valve, the hot air pipe can be opened or closed at regular time by arranging the electromagnetic valve, and the discharge duration of hot air is controlled, so that the phenomenon that the refrigeration effect of the second evaporator is influenced by the fact that the hot air is discharged onto the second evaporator for a long time in a large quantity can be avoided.
In some embodiments, further comprising: the pressure regulating valve is arranged on the secondary refrigeration loop and positioned before the first compressor, and the pressure regulating valve can regulate the air pressure on the secondary refrigeration loop, so that the problem that the second compressor is overloaded and damaged due to the fact that hot air is discharged too much is avoided.
In some embodiments, further comprising: the temperature controller is electrically connected with the controller and used for sensing the external temperature and transmitting the temperature value to the controller, so that the controller independently starts the primary refrigeration loop or simultaneously starts the primary refrigeration loop and the secondary refrigeration loop;
this application on the other hand provides an ultra-low temperature freezer, and ultra-low temperature freezer has solved the technical problem of the refrigeration system operation unstability and the system oil return difficulty through setting up foretell ultra-low temperature freezer.
Drawings
FIG. 1 is a schematic diagram of the ultra-low temperature refrigeration system of the present invention;
FIG. 2 is a diagram showing the flow state of the refrigerant in the first-stage refrigeration circuit in the high-temperature stage of the cold storage of the ultra-low-temperature refrigeration system of the utility model;
fig. 3 is a diagram showing the state in which the refrigerant flows through the primary refrigeration circuit and the secondary refrigeration circuit, respectively, in the low-temperature stage of the refrigerator in the ultra-low-temperature refrigeration system of the present invention.
Reference numerals:
1. a primary refrigeration circuit; 1A, a circulation loop; 1B1, first branch; 1B2, second branch; 101. a first evaporator; 102. a second compressor; 103. a condenser; 104. a first switch; 105. a second switch; 2. a secondary refrigeration circuit; 201. a second evaporator; 202. a first compressor; 203. an oil separator; 204. a pressure regulating valve; 205. an expansion vessel; 3. an air cooler; 4. a hot gas pipe; 5. and (4) evaporating the condenser.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
In one aspect, the present invention provides an ultra-low temperature refrigeration system, including: the air conditioner comprises a secondary refrigeration circuit 2, a primary refrigeration circuit 1, an air cooler 3 and a controller, wherein R22, R404A and R507 refrigerants flow in the primary refrigeration circuit 1, the R23, R508 and other refrigerants are commonly used in the secondary refrigeration circuit 2, the controller is electrically connected with the secondary refrigeration circuit 2 and the primary refrigeration circuit 1, and the primary refrigeration circuit 1 and the secondary refrigeration circuit 2 are overlapped through an evaporative condenser 5.
Specifically, the primary refrigeration circuit 1 is provided with: a first evaporator 101, a first compressor 102, and a condenser 103;
specifically, the secondary refrigeration circuit 2 is provided with: the second evaporator 201, the second compressor 202 and the oil separator 203, and the secondary refrigeration circuit 2 is also connected with a hot gas pipe 4 in parallel, one end of the hot gas pipe 4 is connected with an outlet of the oil separator 203, and the other end is connected with an inlet of the second evaporator 201;
specifically, the first evaporator 101 and the second evaporator 201 are both arranged corresponding to the air cooler 3.
Specifically, the primary refrigeration circuit 1 and the secondary refrigeration circuit 2 exchange cooling capacity through the evaporative condenser 5.
Specifically, the controller is connected with the temperature controller, and the temperature controller is used for responding to external temperature and transmits the temperature value to the controller, makes the controller start one-level refrigeration return circuit 1 alone or start one-level refrigeration return circuit 1 and second grade refrigeration return circuit 2 simultaneously.
Since the pressure of the refrigerant is affected by the temperature of the refrigeration storage and changes, specifically, taking the example that the R22 refrigerant is used in the primary refrigeration loop 1 and the R23 refrigerant is used in the secondary refrigeration loop 2, when the temperature of the external refrigeration storage is higher (higher than-10 ℃), the pressure of the R23 refrigerant is higher and the pressure is higher than 5bar, so that the compressor of the secondary refrigeration loop 2 is in overload operation when compressed, the compressor is in a high-intensity operation state, and the compressor is easily overloaded when being in the high-intensity operation state for a long time; when the temperature of the refrigeration house is higher (higher than-10 ℃), the pressure of the R22 refrigerant of the primary refrigeration loop 1 is lower than the pressure of the R23, the pressure of the compressor of the primary refrigeration loop is in a normal operation range below 5bar, and when the temperature of the refrigeration house is reduced (lower than-10 ℃), the pressures of the R23 refrigerant and the R22 refrigerant are in a proper range and below 5bar, so that the compressors of the secondary refrigeration loop 2 and the primary refrigeration loop 1 are in a normal operation range and can be simultaneously started, the secondary refrigeration loop 2 and the primary refrigeration loop 1 form overlapping to refrigerate the refrigeration house at ultralow temperature. Specifically, the refrigeration range of the ultralow-temperature refrigeration system is-40 ℃ to-80 ℃.
Specifically, the primary refrigeration circuit 1 includes: the refrigerant circulation system comprises a circulation circuit 1A and a liquid supply circuit, wherein a port of the circulation circuit 1A is connected with an evaporative condenser 5 and is provided with a second condenser 103 and a first evaporator 101, the circulation circuit 1A is used for R22 refrigerant to circulate, specifically, the liquid supply circuit comprises a first branch 1B1 and a second branch 1B2, the connection point of the first branch 1B1 and the circulation circuit 1A is A1, the connection point of the second branch 1B2 and the circulation circuit 1A is A2, a first switch 104 is arranged at a position close to the connection point A2 of the circulation circuit 1A, and a second switch 105 is arranged on the first branch 1B 1.
Specifically, the refrigeration process is as follows:
when the cold storage is in the high-temperature initial stage and the temperature in the cold storage is higher (higher than minus 10 ℃), only the primary refrigeration loop 1 is started to refrigerate the cold storage, at the moment, the first switch 104 is closed, under the driving of the first compressor 102, the R22 refrigerant flows into the circulation circuit 1A from the first branch 1B1, flows out of the second branch 1B2 after being cooled by the condenser 103, and finally flows to the first evaporator 101, refrigerating the refrigerator, lowering the temperature of the refrigerator to a proper low temperature (lower than-10 ℃), starting the primary refrigerating circuit 1 and the secondary refrigerating circuit 2, wherein the first switch 104 is opened, the second switch 105 is closed, the R22 refrigerant flows in the circulating circuit 1A, the R23 refrigerant is condensed by the evaporative condenser 5, and the R23 refrigerant circulates through the second evaporator 201 in the secondary refrigeration circuit 2 to cool the refrigerator.
Specifically, because first evaporator 101 and second evaporator 201 all correspond the setting with air-cooler 3, only need set up a single air-cooler 3 and can convey the cold volume of two evaporimeters, can simplify the quantity of part, save manufacturing cost.
Specifically, the hot gas discharged from the oil separator 203 has the characteristics of high temperature and high pressure (hot gas pressure 10-20BAR, hot gas temperature 40-90 ℃), and by a large pressure difference and high temperature, the refrigerant (freezing oil) solidified on the second evaporator 201 is forcibly melted and pushed under strong pressure to flow back into the second compressor 202 along the secondary refrigeration circuit 2;
preferably, the hot gas pipe 4 is provided with an electromagnetic valve for opening or closing the hot gas pipe 4 at regular time, so that the discharge frequency and duration of hot gas can be limited, and the influence of the hot gas on the secondary refrigeration circuit 2 can be reduced.
Preferably, the present application further provides a pressure regulating valve 204 on the secondary refrigeration circuit 2 before the second compressor 202, and the pressure regulating valve 204 can regulate the air pressure on the secondary refrigeration circuit 2, so as to avoid that the air pressure of the secondary refrigeration circuit 2 is too high due to too much hot air discharged, which leads to the overload operation of the second compressor 202.
Preferably, in the present application, the pressure relief circuit connected in parallel to the secondary refrigeration circuit 2 is provided with the opening valve and the expansion container 205, and when the amount of hot gas entering is large, the valve can be opened, and the hot gas is introduced into the expansion container 205, so as to prevent the second compressor 202 from operating in an overload state due to an excessive pressure of the secondary refrigeration circuit 2.
On the other hand, the application provides an ultra-low temperature freezer, and the ultra-low temperature freezer is provided with the ultra-low temperature freezer, so that the technical problems that a refrigeration system is unstable in operation and the system is difficult in oil return are solved.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the utility model and are not to be construed as limiting the utility model. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (5)
1. An ultra-low temperature refrigeration system, comprising: one-level refrigeration circuit (1), second grade refrigeration circuit (2), air-cooler (3) and controller, one-level, second grade refrigeration circuit (2) with the controller is connected and is formed the cascade through evaporative condenser (5), the controller is used for opening alone under predetermined freezer temperature one-level refrigeration circuit (1) or open one-level refrigeration circuit (1) and second grade refrigeration circuit (2) simultaneously, and wherein, one-level refrigeration circuit (1) has set up: a first evaporator (101), a condenser (103) and a first compressor (102), the secondary refrigeration circuit (2) being provided with: the refrigeration system comprises a second evaporator (201), a second compressor (202) and an oil separator (203), and the secondary refrigeration loop (2) is also connected with a hot air pipe (4) in parallel, one end of the hot air pipe (4) is connected with an outlet of the oil separator (203), the other end of the hot air pipe is connected with an inlet of the second evaporator (201), the hot air pipe is used for guiding hot air exhausted by the oil separator (203) into the second evaporator (201) to melt refrigeration oil condensed on the second evaporator (201) and enabling the refrigeration oil to flow back to the second compressor along the secondary refrigeration loop (2), and the first evaporator (101) and the second evaporator (201) are both arranged corresponding to the air cooler (3).
2. An ultra-low-temperature refrigerating system as claimed in claim 1, characterized in that an electromagnetic valve is arranged on the hot air pipe (4), and the electromagnetic valve is controlled to open or close the hot air pipe (4) at regular time.
3. The ultra-low temperature refrigeration system as set forth in claim 1 or 2, further comprising: a pressure regulating valve (204) disposed on the secondary refrigeration circuit (2) and located before the second compressor (202).
4. The ultra-low temperature refrigeration system as set forth in claim 1 or 2, further comprising: the temperature controller is electrically connected with the controller and is used for sensing the temperature of the refrigeration house and transmitting the temperature value to the controller, so that the controller is independently started on the primary refrigeration loop (1) or simultaneously started on the primary refrigeration loop (1) and the secondary refrigeration loop (2).
5. An ultra-low-temperature refrigerator characterized in that the ultra-low-temperature refrigerator comprises the ultra-low-temperature refrigeration system according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120944644.1U CN215412600U (en) | 2021-04-30 | 2021-04-30 | Ultralow temperature refrigerating system and ultralow temperature refrigeration house |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120944644.1U CN215412600U (en) | 2021-04-30 | 2021-04-30 | Ultralow temperature refrigerating system and ultralow temperature refrigeration house |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608213A (en) * | 2022-03-18 | 2022-06-10 | 珠海市精实测控技术有限公司 | High-low temperature working condition cascade refrigeration system and control method thereof |
| CN117387279A (en) * | 2023-12-13 | 2024-01-12 | 珠海格力电器股份有限公司 | Ultralow-temperature refrigeration house, defrosting system of low-temperature refrigeration house and defrosting method |
-
2021
- 2021-04-30 CN CN202120944644.1U patent/CN215412600U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114608213A (en) * | 2022-03-18 | 2022-06-10 | 珠海市精实测控技术有限公司 | High-low temperature working condition cascade refrigeration system and control method thereof |
| CN117387279A (en) * | 2023-12-13 | 2024-01-12 | 珠海格力电器股份有限公司 | Ultralow-temperature refrigeration house, defrosting system of low-temperature refrigeration house and defrosting method |
| CN117387279B (en) * | 2023-12-13 | 2024-04-30 | 珠海格力电器股份有限公司 | Ultralow-temperature refrigeration house, defrosting system of low-temperature refrigeration house and defrosting method |
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