CN101881528A - Oil return control device for direct expanded soil source heat pump - Google Patents
Oil return control device for direct expanded soil source heat pump Download PDFInfo
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- CN101881528A CN101881528A CN 201010241276 CN201010241276A CN101881528A CN 101881528 A CN101881528 A CN 101881528A CN 201010241276 CN201010241276 CN 201010241276 CN 201010241276 A CN201010241276 A CN 201010241276A CN 101881528 A CN101881528 A CN 101881528A
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Abstract
The invention relates to an oil return control device for a direct expanded soil source heat pump. A lubricating oil collecting pipe is arranged at the bottommost part of a U-shaped ground heat exchanger and connected with an oil return pipe with a small caliber; the oil return pipe is wound on an ascending pipe of a U-shaped pipe in a spiral form and connected with an air inlet pipe of a ground compressor; whether oil return circulation is performed is judged through liquid level change of lubricating oil in the compressor; and when the lubricating oil level is lower than the lowest oil return level, a refrigerant passes through the oil return pipe through start and stop of electromagnetic valves arranged on the ascending pipe of the U-shaped pipe and the oil return pipe, and the lubricating oil in the lubricating oil collecting pipe is re-brought into the compressor by using front and back pressure difference and large flow rate of the refrigerant in the oil return pipe to realize successful oil return of a heat pump system. The device has the advantages of solving the oil return problem of the compressor when the system runs under high load and low load, avoiding the defect that the system cannot run continuously for long time in a heat supply mode at the same time and ensuring that the system runs efficiently and stably.
Description
Technical field
The present invention relates to a kind of ground source heat pump technology, particularly relate to a kind of oil return control device of the direct expansion formula soil source heat pump that guarantees system high efficiency, stably moves.
Background technology is well-known, and direct expansion formula soil source heat pump is that cold-producing medium is directly fed ground heat exchanger, and cold-producing medium and surrounding medium carry out direct heat transfer.Heat pump is in the winter time under the heat supply mode, lubricating oil in the compressor enters ground heat exchanger with liquid refrigerant, cold-producing medium absorbs the heat in the surrounding soil, become the low pressure gaseous state by low-pressure liquid, the cooled dose of lubricating oil of bringing in the ground heat exchanger then rests on the bottom of ground pipe laying, because the gas flow rate in the heat exchanger tedge is lower, lubricating oil can not be taken back in the compressor, and be trapped in the bottom of ground pipe laying, along with system constantly moves, cause the compressor oil starvation even damage compressor.
For direct expansion formula soil source heat pump system, usually solving the compressor oil returning method has: 1) oil return apparatus efficiently is set on the ground, reduce and enter the ground heat exchanger lubricants capacity, it can only delay lubricating oil at heat exchanger bottom aggregation velocity, but can not send back to the lubricating oil of heat exchanger bottom in the compressor; 2) flow velocity of gaseous refrigerant in the raising U type pipe laying tedge is taken back lubricating oil in the compressor; If but unit is continuously when low load condition is moved, this method can not solve the problem of compressor oil return difficulty; 3) it is curved oil return to be set on the ground heat exchanger tedge, guarantees system oil return, the principle of this method be equally utilize in the tedge cold-producing medium flow velocity lubricating oil take to oil return curved in, if system in the underload long-time running, exists and 2) identical problem; Above method all can not fundamentally solve the problem of compressor oil return difficulty, particularly system is under underload long-term operation situation, and also can there be the oil return problem in compressor, and the system that influences normally moves, thereby, greatly limited the promotion and application of conventional direct expansion formula soil source heat pump.
Summary of the invention
The present invention provides a kind of oil return control device of the direct expansion formula soil source heat pump that guarantees system high efficiency, stably moves for solving the technical problem that exists in the known technology.
The technical scheme that the present invention takes for the technical problem that exists in the solution known technology is: it comprises underground embedding U-shaped heat exchange of heat pipe, compressor and controller, it is characterized in that: the present invention includes the U-shaped heat exchange of heat pipe, the lubricating oil collecting pipe, oil return pipe, backfilling material, U-shaped pipe down-comer, U-shaped pipe tedge, the A magnetic valve, the B magnetic valve, compressor, indoor heat exchanger, expansion valve, control valve, and signal receiver, described U-shaped pipe tedge is connected with compressor inleting pipe by the B magnetic valve with oil return pipe by the A magnetic valve, compressor is connected with indoor heat exchanger, indoor heat exchanger is connected with expansion valve, expansion valve is connected with U-shaped pipe down-comer, the keying of control valve control A magnetic valve and B magnetic valve, signal receiver will be passed to control valve from the signal that the compressor pasta just sends.
The present invention can also be by the following technical solutions: the bottom of described lubricating oil collecting pipe and U-shaped heat exchange of heat pipe fuses.
The less oil return pipe of described caliber is that spirality is wrapped on the U-shaped pipe tedge, and an end of oil return pipe communicates with the lubricating oil collecting pipe, and the other end is connected with compressor by the B magnetic valve.
Advantage and good effect that the present invention has are: in the bottom of underground U-shaped heat exchange of heat pipe the lubricating oil collecting pipe is set, pipeline lubricating oil can not stop up, and the compressor shutdown problem can not occur; By implementing the lubricated pasta situation of change of monitoring compressor, can reflect the compressor lubricant oil situation accurately, intuitively, avoided causing the problem of compressor oil starvation even damage; System adopts the oil return measure, the system that can guarantee oil return efficient when underrun, thus the assurance system is long-term, stable, operation incessantly; Oil return pipe adopts spiral form to be wrapped on the underground U-shaped heat exchange of heat pipe tedge, compares with VERTICAL TUBE, and the easier oil return of system, oil return speed is rapid.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention; Fig. 2 is underground embedding U-shaped tubular construction schematic diagram; Fig. 3 is the schematic top plan view of Fig. 2.
Among Fig. 1-Fig. 3: 1.U shape heat exchange of heat pipe, 2. lubricating oil collecting pipe, 3. oil return pipe, 4. backfilling material, 5.U shape pipe down-comer, 6.U shape pipe tedge, 7A magnetic valve, 8.B magnetic valve, 9. compressor, 10. indoor heat exchanger, 11. expansion valves, 12. control valves, 13. signal receivers.
The specific embodiment
For further understanding summary of the invention of the present invention, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows, see also Fig. 1-Fig. 3.
As shown in Figure 1-Figure 3: the present invention includes U-shaped heat exchange of heat pipe 1, lubricating oil collecting pipe 2, oil return pipe 3, backfilling material 4, U-shaped pipe down-comer 5, U-shaped pipe tedge 6, A magnetic valve 7, B magnetic valve 8, compressor 9, indoor heat exchanger 10, expansion valve 11, control valve 12 and signal receiver 13, puddled backfill material 4 around embedding U-shaped heat exchange of heat pipe; Described U-shaped pipe tedge 6 is by A magnetic valve 7, the less oil return pipe 3 of caliber is connected with compressor 9 air inlet pipe by B magnetic valve 8, compressor 9 is connected with indoor heat exchanger 10, indoor heat exchanger 10 is connected with expansion valve 11, expansion valve 11 is connected with U-shaped pipe down-comer 5, high temperature and high pressure gaseous refrigerant after compressed machine 9 compressions, be sent in the indoor heat exchanger 10, with the room air heat exchange, become low temperature high pressure gas, pass through expansion valve 11 throttlings then, become low-temp low-pressure gas, send into buried U-shaped heat exchange of heat pipe 1 heat exchange.
The keying of control valve 12 control A magnetic valves 7 and B magnetic valve 8, signal receiver 13 will be passed to control valve 12 from the signal of compressor 9 pastas height; Described lubricating oil collecting pipe 2 fuses with U-shaped heat exchange of heat pipe 1 bottom; The less oil return pipe 3 of described caliber is wrapped on the U-shaped pipe tedge 6 for spirality, and an end of oil return pipe 3 communicates with lubricating oil collecting pipe 2, and the other end is connected with compressor 9 by B magnetic valve 8.
The present invention receives compressor 9 lubricating oil liquid level change informations by signal receiver 13, monitors the level change situation in real time, contrasts the lubricated pasta of compressor 9 operate as normal of actual liquid level and setting, judges whether compressor 9 needs oil return.Open or close by control valve 12 and to be arranged on A magnetic valve 7 and the B magnetic valve 8 on the oil return pipe 3 and heat exchanger tedge 6 on the lubricating oil collecting pipe 2, improve lubricating oil collecting pipe 2 front and back pressure reduction and tedge inner refrigerant flow velocity, and because the less oil return pipe 3 of caliber is a spiral form, more favourable realization system oil return.
During operation, heat pump begins to enter heat supply mode, the present invention adopts the oil return measure, come the above-mentioned oil return control of realization system, promptly when the lubricating oil liquid level drops to the minimum oil return liquid level b of prior setting, the beginning oil return, open and be arranged on the B magnetic valve 8 on the oil return pipe 3 on the lubricating oil collecting pipe 2, close the A magnetic valve 7 on the tedge, pressure reduction and cold-producing medium bigger flow velocity in oil return pipe brings back in the compressor 9 lubricated before and after utilizing, the lubricating oil liquid level constantly rises when reaching high liquid level (HLL) a in the compressor 9, stops the oil return operation, and system finishes oil return.
Implementation step is as follows: 1). and the lubricated pastas of compressor 9 are divided into two liquid levels: high liquid level (HLL) a, minimum oil return liquid level b; 2). continuous monitoring compressor 9 lubricating oil liquid levels, in system's running, liquid level continues to descend, reach minimum oil return surface b, most of lubricating oil is collected into that system enters the oil return operation in the lubricating oil collecting pipe 2: open B magnetic valve 8 on the oil return pipe 3, close A magnetic valve 7 on the underground U-shaped pipe tedge 6, improve the pressure of tube refrigerant, utilize flow velocity bigger in ever-increasing front and back pressure reduction and the oil return pipe, lubricating oil is taken in the compressor 9.Compressor 9 lubricating oil liquid levels constantly increase, and when reaching high liquid level (HLL) a, system oil return EO, heat pump continue normal operation.
Its advantage is: in the bottom of underground U-shaped heat exchange of heat pipe the lubricating oil collecting pipe is set, pipeline can not stop up, and causes compressor shutdown; Change by the lubricated pasta of monitoring compressor, can reflect the compressor lubricant oil situation accurately, intuitively, avoided the problem of compressor oil starvation even damage; The assurance system is oil return efficient when underrun, long-term, stable, the operation incessantly of assurance system; Oil return pipe adopts spiral form to be wrapped on the underground U-shaped heat exchange of heat pipe tedge, the easier oil return of system, and oil return speed is rapid.
Above-described embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that those of ordinary skills make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (3)
1. the oil return control device of a direct expansion formula soil source heat pump, it comprises underground embedding U-shaped heat exchange of heat pipe, compressor and controller, it is characterized in that: the present invention includes underground embedding U-shaped heat exchange of heat pipe (1), lubricating oil collecting pipe (2), oil return pipe (3), backfilling material (4), U-shaped pipe down-comer (5), U-shaped pipe tedge (6), A magnetic valve (7), B magnetic valve (8), compressor (9), indoor heat exchanger (10), expansion valve (11), control valve (12), and signal receiver (13), described U-shaped pipe tedge (6) is connected with compressor (9) air inlet pipe by B magnetic valve (8) with oil return pipe (3) by A magnetic valve (7), compressor (9) is connected with indoor heat exchanger (10), indoor heat exchanger (10) is connected with expansion valve (11), expansion valve (11) is connected with U-shaped pipe down-comer (5), the keying of control valve (12) control A magnetic valve (7) and B magnetic valve (8), signal receiver (13) will be passed to control valve (12) from the signal of compressor (9) pasta height.
2. the oil return control device of direct expansion formula soil source heat pump according to claim 1 is characterized in that: described lubricating oil collecting pipe (2) fuses with the bottom of U-shaped heat exchange of heat pipe (1).
3. the oil return control device of direct expansion formula soil source heat pump according to claim 1, it is characterized in that: the less oil return pipe (3) of described caliber is wrapped on the U-shaped pipe tedge (6) for spirality, one end of oil return pipe (3) communicates with lubricating oil collecting pipe (2), and the other end is connected with compressor (9) by B magnetic valve (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010241276 CN101881528A (en) | 2010-07-30 | 2010-07-30 | Oil return control device for direct expanded soil source heat pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010241276 CN101881528A (en) | 2010-07-30 | 2010-07-30 | Oil return control device for direct expanded soil source heat pump |
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| CN101881528A true CN101881528A (en) | 2010-11-10 |
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| CN 201010241276 Pending CN101881528A (en) | 2010-07-30 | 2010-07-30 | Oil return control device for direct expanded soil source heat pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741170A (en) * | 2017-10-23 | 2018-02-27 | 中南建筑设计院股份有限公司 | A kind of dual U-shaped heat exchange of heat pipe for soil source heat pump system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2931485A1 (en) * | 1979-08-03 | 1981-02-05 | Rudolf Oetjengerdes | Heat recovery from ground water bore holes - using evaporator of refrigeration circuit with vertical copper cylinder surrounded by plastic heat transfer tube |
| US4715196A (en) * | 1986-04-11 | 1987-12-29 | Diesel Kiki Co., Ltd. | Oil returning mechanism of evaporator for air conditioner |
| US5671608A (en) * | 1996-04-19 | 1997-09-30 | Geothermal Heat Pumps, Inc. | Geothermal direct expansion heat pump system |
| WO2009056527A2 (en) * | 2007-10-30 | 2009-05-07 | Arcelik Anonim Sirketi | A cooling device |
| CN101776355A (en) * | 2010-03-12 | 2010-07-14 | 湖南大学 | Oil-return control method of large-head long-piping heat pump air conditioning system |
| CN201724472U (en) * | 2010-07-30 | 2011-01-26 | 中国汽车工业工程公司 | Oil return control device of direct-expansion-type ground source heat pump |
-
2010
- 2010-07-30 CN CN 201010241276 patent/CN101881528A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2931485A1 (en) * | 1979-08-03 | 1981-02-05 | Rudolf Oetjengerdes | Heat recovery from ground water bore holes - using evaporator of refrigeration circuit with vertical copper cylinder surrounded by plastic heat transfer tube |
| US4715196A (en) * | 1986-04-11 | 1987-12-29 | Diesel Kiki Co., Ltd. | Oil returning mechanism of evaporator for air conditioner |
| US5671608A (en) * | 1996-04-19 | 1997-09-30 | Geothermal Heat Pumps, Inc. | Geothermal direct expansion heat pump system |
| WO2009056527A2 (en) * | 2007-10-30 | 2009-05-07 | Arcelik Anonim Sirketi | A cooling device |
| CN101776355A (en) * | 2010-03-12 | 2010-07-14 | 湖南大学 | Oil-return control method of large-head long-piping heat pump air conditioning system |
| CN201724472U (en) * | 2010-07-30 | 2011-01-26 | 中国汽车工业工程公司 | Oil return control device of direct-expansion-type ground source heat pump |
Non-Patent Citations (1)
| Title |
|---|
| 《中国优秀硕士学位论文全文数据库》 20090131 贾韶强 直接膨胀式土壤源热泵实验研究及地下换热系统分析 正文第1-14页 1-3 , 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741170A (en) * | 2017-10-23 | 2018-02-27 | 中南建筑设计院股份有限公司 | A kind of dual U-shaped heat exchange of heat pipe for soil source heat pump system |
| CN107741170B (en) * | 2017-10-23 | 2019-08-23 | 中南建筑设计院股份有限公司 | A kind of dual U-shaped heat exchange of heat pipe for soil source heat pump system |
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Application publication date: 20101110 |