CN201028857Y - Stacked refrigeration unit auxiliary device - Google Patents
Stacked refrigeration unit auxiliary device Download PDFInfo
- Publication number
- CN201028857Y CN201028857Y CNU2007200377319U CN200720037731U CN201028857Y CN 201028857 Y CN201028857 Y CN 201028857Y CN U2007200377319 U CNU2007200377319 U CN U2007200377319U CN 200720037731 U CN200720037731 U CN 200720037731U CN 201028857 Y CN201028857 Y CN 201028857Y
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- low temperature
- temperature level
- compressor
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Abstract
The utility model discloses a cascade refrigerating machine auxiliary device which comprises a high temperature level refrigerating machine and a low level refrigerating machine connected at the two ends of the condensation evaporator. The inspiration end of the low temperature compressor of the low temperature level refrigerating machine is connected with an auxiliary compressor which is connected with an air receiver through a unilateral valve. The inspiration end of the air receiver and the low temperature compressor is directly communicated with the solenoid valve. The device can assist the high temperature level refrigeration to low level temperature refrigerant rapidly after starting the low temperature level and restrain short-time up cross-flow of the low level temperature condensation pressure. After stable start, the solenoid valve opens at proper time and the refrigerant in the air receiver gradually flows back to the low temperature level refrigerating system then the auxiliary device evacuates, thereby improving the reliability and efficiency of the cascade refrigerating machine through the process.
Description
Technical field
The utility model relates to a kind of cascade refrigerating unit auxiliary device.
Background technology
Industrial (as oil, chemical industry etc.) in order to satisfy requirements such as production technology and scientific research, generally adopts steam compression type low temperature cascade refrigeration EGR to obtain lower evaporating temperature (generally being used for producing-60～-120 ℃ low temperature).The cold machine of this type of superposition type generally is made up of two independent refrigeration systems, be called high temperature level and low temperature level, correspondingly in the system of each independent loops two kinds of different cold-producing mediums have been adopted, warm cold-producing medium during the high temperature level is used, the low temperature level is used low-temperature refrigerant, this type systematic requires under low temperature under the evaporating pressure and environment temperature condensing pressure moderate, can satisfy the designing requirement of refrigerating plant.But the low-temperature refrigerant that adopts in its low temperature level such as R14 or R23; surpassed its critical-temperature at normal temperatures; all exist with gaseous form and equalizing pressure higher; and generally be attached to expansion vessel in the low temperature level system; only be to reduce the equalizing pressure behind the compressor emergency shutdown, the rapid rising to condensing pressure produces little effect behind the unit to starting.So such cascade refrigeration unit often all is that low temperature level short time internal cause condensing pressure is too high and pressure protect occurs after start, cause starting failure or can not starting lastingly, this brings adverse effect to the instructions for use that requires in good time cooling.At present, in the cascade refrigeration machine, it is the most common that common faults starts failure with low temperature level in the main system.Solving smooth startup of the cold machine of superposition type is the important content that improves system reliability.
Summary of the invention
The utility model purpose is: a kind of cascade refrigerating unit auxiliary device is provided, this device can be transferred to part low temperature level cold-producing medium in the air accumulator of servicing unit when starting the low temperature level fast, refrigerant amount reduces in the cryogenic system, thereby scurry on the short time of inhibition low temperature level condensing pressure, after startup operates steadily, again the low-temperature refrigerant in the air accumulator is returned to cryogenic system, make system carry out the transition to normal operating phase, therefore, improve the reliability and the efficient of cascade refrigeration unit starting.
The technical solution of the utility model is: a kind of cascade refrigerating unit auxiliary device, comprise the high temperature level refrigeration unit and the low temperature level refrigeration unit that are connected the condenser/evaporator two ends, the suction end of the cryogenic compressor of described low temperature level refrigeration unit is connected with auxiliary compressor, auxiliary compressor is connected with air accumulator by check valve, and air accumulator also directly is communicated with by magnetic valve with the suction end of cryogenic compressor.
The utility model is intended to increase easy device in the common cascade refrigeration machine, and low temperature part toggle speed in the cascade refrigeration system is fast, success rate is high to facilitate.The low-temperature refrigerant that superposition type low temperature level adopts generally has higher equalizing pressure when normal temperature; after the startup; condensing pressure can sharply rise in short time; high temperature level refrigeration system remains unchanged by the ability of cooling that plate changes low temperature level cold-producing medium; at this moment; corresponding raising is as easy as rolling off a log not to cause the high voltage protective switch motion that system is quit work to the pressure at expulsion of moment rising because of cooling effect has; perhaps; compressor thermal protector moves and stops compressor, causes the cooling failure of low temperature level.The servicing unit that increases can be after starting the low temperature level, by aspirating the amount of the cold-producing medium that circulates in the low temperature level system, reduce the cold-producing medium evaporating pressure, thereby suppressed low temperature level condensing pressure short time on scurry, in case after thermal balance was set up, system operated steadily, pressure does not have big fluctuation, can stop auxiliary compressor in good time and open magnetic valve the cold-producing medium that stores in the servicing unit is restored in the low temperature level system, thereby remove the attendant effect of servicing unit gradually system.
The utility model has the advantages that:
1. the utility model has improved cascade refrigeration unit low temperature level starting efficiency and has started reliability.
2. the utility model is simple in structure, and the cost and the process complexity of increase are less.
3. therefore the utility model can omit as other assemblies such as expansion vessels.
Below in conjunction with drawings and Examples the utility model is further described:
Fig. 1 is a structural representation of the present utility model.
Wherein: 1 condenser/evaporator; 2 high temperature level refrigeration unit; 3 low temperature level refrigeration unit; 4 cryogenic compressors; 5 auxiliary compressors; 6 check valves; 7 air accumulators; 8 magnetic valves.
The specific embodiment
Embodiment: as shown in Figure 1, a kind of cascade refrigerating unit auxiliary device, comprise the high temperature level refrigeration unit 2 and the rudimentary refrigeration unit 3 that are connected condenser/evaporator 1 two ends, the suction end of the cryogenic compressor 4 of described low temperature level refrigeration unit 3 is connected with auxiliary compressor 5, auxiliary compressor 5 is connected with air accumulator 7 by check valve 6, and air accumulator 7 also directly is communicated with by magnetic valve 8 with the suction end of cryogenic compressor 4.The utility model is connected with auxiliary compressor 5 before the air entry of cryogenic compressor 4, when auxiliary compressor 5 starts, it can be transferred to low temperature refrigerant in the low temperature level in the air accumulator 7, reduce pressure at expulsion owing to cold medium flux in the cryogenic system is not enough, can start the low temperature level rapidly after making the main system start.After refrigerant in the cryogenic system dropped to a certain temperature or pressure, magnetic valve 8 was opened, and air accumulator 7 promptly is communicated with the low temperature level system, got back to the low temperature level system after the low temperature refrigerant that stores in the air accumulator 7 is sucked by cryogenic compressor 4 and participated in kind of refrigeration cycle.The servicing unit that by inserting auxiliary compressor 4 is arranged like this, critical pieces such as air accumulator 7 and solenoid electric valve 8 constitutes can guarantee that low-temperature end can start success rapidly when startup superposition type system.
Claims (1)
1. cascade refrigerating unit auxiliary device, comprise the high temperature level refrigeration unit (2) and the low temperature level refrigeration unit (3) that are connected condenser/evaporator (1) two ends, it is characterized in that: the suction end of the cryogenic compressor (4) of described low temperature level refrigeration unit (3) is connected with auxiliary compressor (5), auxiliary compressor (5) is connected with air accumulator (7) by check valve (6), and air accumulator (7) also directly is communicated with by magnetic valve (8) with the suction end of cryogenic compressor (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200377319U CN201028857Y (en) | 2007-05-18 | 2007-05-18 | Stacked refrigeration unit auxiliary device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200377319U CN201028857Y (en) | 2007-05-18 | 2007-05-18 | Stacked refrigeration unit auxiliary device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201028857Y true CN201028857Y (en) | 2008-02-27 |
Family
ID=39133072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200377319U Expired - Lifetime CN201028857Y (en) | 2007-05-18 | 2007-05-18 | Stacked refrigeration unit auxiliary device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201028857Y (en) |
-
2007
- 2007-05-18 CN CNU2007200377319U patent/CN201028857Y/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20070518 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |