CN200961977Y - Oil-returning device for defrosting the wind cooling screw cold water heat pump unit - Google Patents
Oil-returning device for defrosting the wind cooling screw cold water heat pump unit Download PDFInfo
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- CN200961977Y CN200961977Y CN 200620077558 CN200620077558U CN200961977Y CN 200961977 Y CN200961977 Y CN 200961977Y CN 200620077558 CN200620077558 CN 200620077558 CN 200620077558 U CN200620077558 U CN 200620077558U CN 200961977 Y CN200961977 Y CN 200961977Y
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- expansion valve
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Abstract
The utility model discloses an oil returning device used for defrosting in an air-cooled screw-type cold-water heat-pump unit, which comprises a refrigerating expansion valve, wherein the high-pressure side of the refrigerating expansion valve is connected with an accumulator, the low-pressure side of the refrigerating expansion valve is connected with a water-side heat exchanger, and an introducing solenoid valve, one end of which is connected with the high-pressure side of the refrigerating expansion valve, the other end of which is connected with the refrigerating expansion valve, when the introducing solenoid valve is opened, the introducing solenoid valve can realize parallel by-passing of the refrigerating expansion valve and enlarge the quantity of coolant of the unit. Thereby, the air-cooled screw-type cold-water heat-pump unit can carry out non-throttling fluid by-passing to the high pressure and the low pressure of the unit by the commands of a control program after defrosting and reversing, and increase low-pressure air-suction quantity of the unit in a short time to set up high pressure of the unit fast, thereby the pressure difference between the high pressure and the low pressure of the unit is increased, which in turns to increase the flowing quantity of the refrigerating expansion valve, make lubricating oil and coolant together sucked into oil sump of compressor, and realize the ordinary lubrication.
Description
Technical field
The utility model relates to a kind of central air-conditioning and heats technology, and especially a kind of central air-conditioning heats with air-cooled screw cold water source pump defrosting oil return apparatus.
Background technology
Air-cooled screw cold water source pump since the beginning of the nineties in last century, in China south and the Yangtze river basin obtained widely using.The one of specific of air-cooled screw cold water source pump helical-lobe compressor is exactly that normal operation needs big amount temperature and the suitable lubricating oil of viscosity.That lubricating oil has is lubricated, functions such as energy adjustment are carried out in cooling, sealing, noise reduction, driving displacement-regulating sliding piece.Because the type compressor rotary speed is higher, is generally 2950r/m, in case the lubricating oil disappearance will have " lubrication failure " phenomenon to produce, cause compressor rotating mechanism " locking ", also can cause motor overheating to damage phenomenon when serious.
Nearly all air-cooled screw cold water source pump all adopts four-way change-over valve reverse cycle defrost mode at present, and promptly unit changes kind of refrigeration cycle suddenly into by heating circulation.Yet, when unit changes refrigerating operaton into suddenly at heating operation, the height pressure side of unit changes, and refrigerant system and lubricating oil system are all caused huge impact, and this impact is poured lubricating oil in the compressor oil groove in compressor low-pressure area and system pipeline and the heat exchanger and gone.This moment, the unit high pressure was difficult to set up because unit air-side heat exchanger temperature is lower, thereby the expansion valve two ends pressure reduction that causes freezing is less, and the long-time as shown in Figure 1 t of machine set system low pressure P keeps smaller value.The inspiratory capacity of unit sharply descends, and lubricating oil can't be followed cold-producing medium and is inhaled into compressor together, thereby causes the compressor oil starvation.
Summary of the invention
In order to overcome above-mentioned defective, the utility model provides a kind of air-cooled screw cold water source pump defrosting oil return apparatus, the use of this air-cooled screw cold water source pump defrosting oil return apparatus causes the problem of lubrication failure because of " it is oily to run quickly " in the time of solving the defrosting of air-cooled screw cold water source pump well.
The utility model for the technical scheme that solves its technical problem and adopt is: a kind of air-cooled screw cold water source pump defrosting oil return apparatus, comprise the refrigeration expansion valve, refrigeration expansion valve high-pressure side links to each other with reservoir, low-pressure end links to each other with water-side heat, be provided with one and induce magnetic valve, induce magnetic valve one end to link to each other with refrigeration expansion valve high-pressure side, the other end links to each other with refrigeration expansion valve low-pressure end, when machine set system low pressure less than when setting value, induce magnetic valve to open, the refrigeration expansion valve is realized bypass in parallel, increase the refrigerant flow of unit, when machine set system low pressure reaches setting value, induce closed electromagnetic valve, refrigeration expansion valve flow increases gradually, and oil return enters normal condition.
The beneficial effects of the utility model are: owing to induce magnetic valve one end to link to each other with refrigeration expansion valve high-pressure side, the other end links to each other with refrigeration expansion valve low-pressure end, when inducing magnetic valve to open, can realize bypass in parallel like this, increase the refrigerant flow of unit the refrigeration expansion valve.Can carry out not throttling liquid bypass to unit high pressure and low pressure by the control program instruction after the therefore air-cooled screw cold water source pump defrosting commutation, short time increases unit low pressure air suction amount, set up rapidly to induce the unit high pressure, thereby increase the pressure differential between the unit height pressure, increase the flow of refrigeration expansion valve conversely, make lubricating oil be inhaled into the compressor oil groove in the lump, realize normally lubricated in company with cold-producing medium.
Description of drawings
Fig. 1 is at present used air-cooled screw cold water source pump defrosting beginning back low pressure change curve;
Fig. 2 is present used air-cooled screw cold water heat pump set system flow chart;
Fig. 3 is that the utility model is connected in the flow chart in the air-cooled screw cold water heat pump set system;
Fig. 4 opens back low pressure change curve for the utility model.
Among the figure: 1-heats expansion valve; The 2-check valve; The 3-expansion valve that freezes; The 4-reservoir; The 5-compressor; The 6-four-way change-over valve; The 7-water-side heat; The 8-gas-liquid separator; The 9-air-side heat exchanger; 10-induces magnetic valve; The t-time; P-machine set system low pressure; P1-first low pressure setting value; P2-second low pressure setting value; The t1-very first time; Second time of t2-.
The specific embodiment
Embodiment: a kind of air-cooled screw cold water source pump defrosting oil return apparatus, the refrigeration expansion valve that comprises the cold water source pump, refrigeration expansion valve high-pressure side links to each other with reservoir, low-pressure end links to each other with water-side heat, be provided with one and induce magnetic valve, induce magnetic valve one end to link to each other with refrigeration expansion valve high-pressure side, the other end links to each other with refrigeration expansion valve low-pressure end, when machine set system low pressure less than when setting value, induce magnetic valve to open, the refrigeration expansion valve is realized bypass in parallel, increase the refrigerant flow of unit, when machine set system low pressure reaches setting value, induce closed electromagnetic valve, refrigeration expansion valve flow increases gradually, and oil return enters normal condition.
Operation principle of the present utility model is: referring to Fig. 4, when the unit control program detected the needs defrosting, control program sent instruction, made the commutation of unit four-way change-over valve.Because high-low pressure is realized suddenly exchanging, owing to the existence of unit air-side heat exchanger frost layer, defrost needs abundant heat, sets up so the unit high pressure is difficult in the short time simultaneously.This moment, control program detected machine set system low pressure P low excessively (being lower than first low pressure setting value p1), send instruction, the magnetic valve of inducing among Fig. 3 is opened, unit is realized high pressure and not throttling of low pressure liquid bypass, fast lifting machine set system low pressure P, as shown in Figure 4, and increase unit low pressure air suction amount, set up rapidly to induce the unit high pressure, thereby increase the pressure differential between the unit height pressure, increase the flow of refrigeration expansion valve conversely, make lubricating oil be inhaled into the compressor oil groove in the lump in company with cold-producing medium.When inducing magnetic valve to open very first time t1, machine set system low pressure P can increase fast, when treating that machine set system low pressure P is increased to second low pressure setting value p2, the unit control program sends instruction, close during to the second time t2 and induce magnetic valve, unit is finished defrosting pressure inducement process, and oil return enters normal condition.
Claims (1)
1. air-cooled screw cold water source pump defrosting oil return apparatus, comprise the refrigeration expansion valve, refrigeration expansion valve high-pressure side links to each other with reservoir, low-pressure end links to each other with water-side heat, it is characterized in that: be provided with one and induce magnetic valve, induce magnetic valve one end to link to each other with refrigeration expansion valve high-pressure side, the other end links to each other with refrigeration expansion valve low-pressure end, when machine set system low pressure less than when setting value, induce magnetic valve to open, the refrigeration expansion valve is realized bypass in parallel, increase the refrigerant flow of unit, when machine set system low pressure reaches setting value, induce closed electromagnetic valve, refrigeration expansion valve flow increases gradually, and oil return enters normal condition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620077558 CN200961977Y (en) | 2006-09-20 | 2006-09-20 | Oil-returning device for defrosting the wind cooling screw cold water heat pump unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620077558 CN200961977Y (en) | 2006-09-20 | 2006-09-20 | Oil-returning device for defrosting the wind cooling screw cold water heat pump unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200961977Y true CN200961977Y (en) | 2007-10-17 |
Family
ID=38798495
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620077558 Expired - Fee Related CN200961977Y (en) | 2006-09-20 | 2006-09-20 | Oil-returning device for defrosting the wind cooling screw cold water heat pump unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN200961977Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010054498A1 (en) * | 2008-11-11 | 2010-05-20 | Carrier Corporation | Heat pump system and method of operating |
-
2006
- 2006-09-20 CN CN 200620077558 patent/CN200961977Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010054498A1 (en) * | 2008-11-11 | 2010-05-20 | Carrier Corporation | Heat pump system and method of operating |
| CN102216700A (en) * | 2008-11-11 | 2011-10-12 | 开利公司 | Heat pump system and method of operating |
| CN102216700B (en) * | 2008-11-11 | 2014-04-02 | 开利公司 | Heat pump system and method of operating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071017 Termination date: 20150920 |
|
| EXPY | Termination of patent right or utility model |