CN201255548Y - Automatic oil return control device for refrigeration system - Google Patents
Automatic oil return control device for refrigeration system Download PDFInfo
- Publication number
- CN201255548Y CN201255548Y CNU2008200386844U CN200820038684U CN201255548Y CN 201255548 Y CN201255548 Y CN 201255548Y CN U2008200386844 U CNU2008200386844 U CN U2008200386844U CN 200820038684 U CN200820038684 U CN 200820038684U CN 201255548 Y CN201255548 Y CN 201255548Y
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- oil
- compressor
- oil return
- controller
- throttling
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Abstract
The utility model relates to an automatic oil return control device used in a refrigeration system and is characterized in that the device essentially comprises an oil level detection device (6) arranged in an oil groove arranged in an compressor (2), a loading adjusting mechanism (7), a controller (1) and a throttling liquid supply device(4); wherein, the oil level detection device (6), loading adjusting mechanism (7) and the throttling liquid supply device (4) are all electrically connected with the controller (1); an input end of the throttling liquid supply device (4) is communicated with an outlet of a condenser (3); and an output end of the throttling liquid supply device (4) is communicated with a suction inlet of the compressor (2) through a flooded evaporator (5). The control device can ensure that when a machine set may have the fault of lack of oil, a series of measures can be taken, and the trapped oil can be effectively pumped back from the system, which avoids the phenomenon of warning and closedown of the machine set because of the lack of oil of the compressor to the largest extent.
Description
Technical field
The present invention relates to a kind of air-conditioning technical, especially a kind of oil return control device of full-liquid type air-conditioning unit, specifically a kind of refrigeration system automatic oil return control device.
Background technology
As everyone knows; compressor is in operation process; need in its oil groove, there be an amount of lubricating oil and guarantees good lubrication between mechanical moving element; but simultaneously because oil and cold-producing medium have certain intersolubility; compressor is in compressed refrigerant; can be discharged to oil in the refrigeration system together with cold-producing medium; in the long-time running process; oil will accumulate in the heat exchanger and pipeline of system gradually; if lubricating oil can't normally get back to compressor or oil return is untimely, compressor is moved, under the oil starvation state because of it can't obtain sufficient lubrication; the lighter can cause unit because of the shutdown of reporting to the police of compressor oil starvation, weight person even can cause the compressor damage.Especially for the refrigeration system that adopts flooded evaporator, because the peculiar principle and the structure of flooded evaporator, be brought in the system oily because can't in evaporimeter, evaporate, can mainly accumulate in the top of evaporimeter inner refrigerant liquid level, cause oil return difficulty more, thereby reliable and stable oil return technology plays crucial effects especially for the safe and reliable operation of full-liquid type unit.Though at present for the unit that adopts flooded evaporator; all adopted certain oil return system to come from the evaporimeter oil return; but in the unit actual moving process; variation often along with load and operating mode; these oil return systems can not guarantee timely oil return fully; when oil return system can't be stablized oil return; compressor will be in the oil starvation state; and currently used solution only is passive warning shutdown; wait for then and manually go to take some measures; manually from system, draw back lubricating oil, promptly reduced the reliability of unit, and increased the cost of manual maintenance.
Summary of the invention
The objective of the invention is at existing full-liquid type air-conditioning unit oil return poor stability, easily cause compressor damage, and can not need use inconvenience and the big problem of maintenance workload that manual intervention brought by automatic oil return, a kind of refrigeration system automatic oil return control device that can regulate oil return according to fluid level condition in the compressor oil groove automatically is provided.
Technical scheme of the present invention is:
A kind of refrigeration system automatic oil return control device, it is characterized in that it mainly is made up of the oil level detecting device in the oil groove that is installed in compressor 26, load governor motion 7, controller 1 and throttling liquid feed device 4, oil level detecting device 6, load governor motion 7 and throttling liquid feed device 4 all are electrically connected with controller 1, the input of throttling liquid feed device 4 communicates with the outlet of condenser 3, and the output of throttling liquid feed device 4 communicates by the air entry of flooded evaporator 5 with compressor 2.
Described oil level detecting device 6 is liquid-level switch or liquid level sensor, and described throttling liquid feed device 4 is automatically controlled flow valve.
Beneficial effect of the present invention:
When the present invention can make compressor the oil starvation situation occur; substitute manually-operated and realize automatic oil return, can avoid unit to greatest extent, improved the stability and the reliability of unit greatly because of the shutdown of reporting to the police of compressor oil starvation; can reduce operation expense, improve competitiveness of product.
Method of the present invention, device are simple and reliable, make, debugging, install all very convenient.
Description of drawings
Fig. 1 is a control system theory structure schematic diagram of the present invention.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Embodiment one.
As shown in Figure 1.
A kind of refrigeration system automatic oil return control device, it mainly (can adopt liquid-level switch commonly used or liquid level sensor etc. by the oil level detecting device in the oil groove that is installed in compressor 26, but it is the wire transmission signal both, also can adopt wireless signal transmission), load governor motion 7 (can adopt conventional speed setting controller or load adjusting valve to be realized), controller 1 (controller that can adopt existing air-conditioning system to use adds that control corresponding software is realized) and throttling liquid feed device 4 (can adopt electric expansion valve, automatically controlled flow valve, electro-hydraulic valve, electric gate valve etc.) form, oil level detecting device 6, load governor motion 7 and throttling liquid feed device 4 all are electrically connected (wired or wireless all can) with controller 1, the input of throttling liquid feed device 4 communicates with the outlet of condenser 3, and the output of throttling liquid feed device 4 communicates by the air entry of flooded evaporator 5 with compressor 2.
Operation principle of the present invention is:
The oil level that detects in the compressor oil groove by oil level detecting device when controller is lower than lower limit; in the time of might reporting to the police shutdown because of oil starvation; then start a cover automatic oil return control program; this program is by the load governor motion of control compressor; make compressor loads to full-load run; flow area with throttling liquid feed device in the seasonal system is opened to maximum; above-mentioned measure has increased the liquid supply rate of evaporimeter; refrigerant level in the flooded evaporator is increased near the compressor air suction mouth at evaporimeter top; the loading of compressor has simultaneously also caused the increase of inspiratory capacity, thereby makes compressor in time suck back compressor from the oil slick that air entry will accumulate in evaporimeter liquid level top.After controller detects compressor by oil level detecting device oil level returns to normal level again, then finish to draw oily program automatically, make the state before the load of compressor and liquid feed device return to automatic oil return.
By above-mentioned a series of apparatus and method, can when existing the oil starvation risk, compressor can from system, draw back trapped fuel automatically effectively, and farthest avoided unit because of the shutdown of reporting to the police of compressor oil starvation.
The key of the automatic oil return control method that matches with said apparatus is to increase control program in existing controller, and oil level detecting device (as liquid level sensor commonly used) is installed in the compressor oil groove simultaneously; When the oil level in the compressor oil groove was lower than safety value, oil level detecting device sent the oil starvation signal to controller; After controller receives the oil starvation signal, controller starts the oily program of drawing immediately, at first make compressor loads to the full-load run state by the control load governor motion, secondly, the flow area of the throttling liquid feed device (can adopt the automatically controlled flow valve that is controlled by director demon) in the system of being installed in is opened to maximum, with the liquid supply rate of increase flooded evaporator and the inspiratory capacity of compressor, make refrigerant level in the flooded evaporator be elevated to the compressor air suction mouth place at flooded evaporator top by increasing liquid supply rate, by increasing inspiratory capacity, the oil slick that makes compressor have enough energy will accumulate in flooded evaporator liquid level top sucks back compressor from air entry; At last, when the oil mass of resorption in the compressor oil groove reached safety value, oil level detecting device sent signal to controller, and controller stops to carry out and draws oily program, and control load governor motion, throttling liquid feed device are returned to normal operating conditions.
The part that the present invention does not relate to prior art that maybe can adopt all same as the prior art is realized.
Claims (2)
1, a kind of refrigeration system automatic oil return control device, it is characterized in that it mainly is made up of the oil level detecting device in the oil groove that is installed in compressor (2) (6), load governor motion (7), controller (1) and throttling liquid feed device (4), oil level detecting device (6), load governor motion (7) and throttling liquid feed device (4) all are electrically connected with controller (1), the input of throttling liquid feed device (4) communicates with the outlet of condenser (3), and the output of throttling liquid feed device (4) communicates by the air entry of flooded evaporator (5) with compressor (2).
2, refrigeration system according to claim 1 automatic oil return control device is characterized in that described oil level detecting device (6) is liquid-level switch or liquid level sensor, and described throttling liquid feed device (4) is automatically controlled flow valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200386844U CN201255548Y (en) | 2008-08-18 | 2008-08-18 | Automatic oil return control device for refrigeration system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200386844U CN201255548Y (en) | 2008-08-18 | 2008-08-18 | Automatic oil return control device for refrigeration system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201255548Y true CN201255548Y (en) | 2009-06-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200386844U Expired - Lifetime CN201255548Y (en) | 2008-08-18 | 2008-08-18 | Automatic oil return control device for refrigeration system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201255548Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111219911A (en) * | 2020-01-09 | 2020-06-02 | 珠海格力电器股份有限公司 | Injection oil return device and refrigeration equipment |
-
2008
- 2008-08-18 CN CNU2008200386844U patent/CN201255548Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111219911A (en) * | 2020-01-09 | 2020-06-02 | 珠海格力电器股份有限公司 | Injection oil return device and refrigeration equipment |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090610 |
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| CX01 | Expiry of patent term |