CN111678270A - Heat pipe and vapor compression composite system with self-operated capacity adjusting liquid reservoir - Google Patents
Heat pipe and vapor compression composite system with self-operated capacity adjusting liquid reservoir Download PDFInfo
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- CN111678270A CN111678270A CN202010527429.1A CN202010527429A CN111678270A CN 111678270 A CN111678270 A CN 111678270A CN 202010527429 A CN202010527429 A CN 202010527429A CN 111678270 A CN111678270 A CN 111678270A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/006—Accumulators
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Abstract
The invention discloses a heat pipe and vapor compression composite system with a self-operated capacity adjusting reservoir, which comprises an evaporator, a compressor, a condenser, a throttling device, a first bypass valve connected with the compressor in parallel and a second bypass valve connected with the throttling device in parallel, wherein the self-operated capacity adjusting reservoir is arranged on an outlet pipeline of the condenser; the self-operated capacity adjusting liquid storage device comprises a liquid storage cavity, a piston, an adjusting cavity, a spring, an inlet connecting pipe end, an outlet connecting pipe end, a front limiting pin and a rear limiting pin, wherein the inlet connecting pipe end and the outlet connecting pipe end are arranged above and below the liquid storage cavity respectively, the liquid storage cavity is isolated from the adjusting cavity through the piston, the piston is connected with the spring, and the front limiting pin and the rear limiting pin limit the moving position of the piston. The self-operated capacity regulating reservoir can ensure that the heat pipe mode and the vapor compression mode work under the respective optimal refrigerant charge amount, and ensure that the heat pipe mode and the vapor compression mode run efficiently.
Description
The technical field is as follows:
the invention relates to a heat pipe and vapor compression composite system with a self-operated capacity regulating liquid storage device, which is suitable for heat dissipation of data centers, communication base stations and electronic equipment and belongs to the field of equipment heat management and environmental control.
Background art:
the heat pipe and vapor compression composite refrigeration technology is a refrigeration technology integrating two circulation modes of heat pipe circulation and vapor compression circulation, and is applied to the fields of natural cooling of a data center (a flooded composite type cold air unit, application number: 200810118209.2), a solar air source heat pump system (a solar air source heat pump, application number: 201511029273.X), high-energy weapon heat dissipation and the like (a modular composite type high-energy weapon heat dissipation system and a control method thereof, application number: 201710252599.1). The technique generally includes an evaporator, a condenser, a compressor, a throttling device, a first bypass branch arranged in parallel with the compressor, and a second bypass branch arranged in parallel with the throttling device. When the outdoor temperature is low or the heat dissipation capacity is low, the compressor and the throttling device stop working, the first bypass branch and the second bypass branch are opened, and the system operates in a heat pipe circulation mode, so that the energy consumption is low and the energy conservation can be realized; when the outdoor temperature is low or the heat dissipation capacity is high, the compressor and the throttling device operate, the first bypass branch and the second bypass branch are closed, the system operates in a vapor compression mode, and the operation safety of the system is guaranteed. Meanwhile, the system has the advantages of compact structure, easiness in control, energy conservation, material conservation, land conservation and initial investment conservation, and has a good application prospect.
However, during the application, it was found that it is difficult for the hybrid refrigeration technology to operate efficiently in both the heat pipe mode and the vapor compression mode, one of the main reasons being the refrigerant charge mismatch problem. The compound refrigeration system shares the evaporator and condenser, while the refrigerant charge is also fixed. However, in general, the heat pipe mode requires a large refrigerant charge, while the vapor compression mode requires a small charge, and thus it is difficult to ensure that both modes of operation are at optimal charges. When the filling amount is larger, the vapor compression mode can generate liquid accumulation phenomenon, so that the performance is poor; when the filling amount is small, the driving liquid column cannot be formed in the heat pipe circulation mode, and the phenomenon of overheating of the evaporator can occur, so that the performance is poor. Adding a conventional fixed volume accumulator also fails to address this problem because a large amount of refrigerant can still stay in the accumulator during heat pipe mode, failing to participate in the cycle, and the fixed volume accumulator generally reduces the heat pipe cycle drive fluid column.
The invention content is as follows:
aiming at the defects of the prior art, the invention provides a heat pipe and vapor compression composite system with a self-operated capacity regulating reservoir, wherein in a heat pipe mode, the volume of a liquid storage cavity of the reservoir is smaller, and most of refrigerant in the system participates in heat pipe circulation; in the vapor compression mode, the receiver chamber volume of the receiver becomes large, excess refrigerant is stored in the receiver, and only a small amount of refrigerant participates in the vapor compression cycle. The system can work in the best filling amount under the heat pipe mode and the vapor compression mode, and the high-efficiency operation of the two working modes of the composite system is guaranteed. In addition, the volume of the liquid storage device is adjusted by utilizing the pressure difference self-operated drive established by the compressor, additional power is not needed, the control is simple and convenient, and the reliability is higher.
The technical scheme adopted by the invention is as follows: a heat pipe and vapor compression composite system with a self-operated capacity adjustment liquid reservoir comprises an evaporator, a compressor, a condenser, a throttling device, a first bypass valve connected with the compressor in parallel and a second bypass valve connected with the throttling device in parallel, wherein the self-operated capacity adjustment liquid reservoir is arranged on an outlet pipeline of the condenser;
the self-operated capacity adjusting liquid storage device comprises a liquid storage cavity, a piston, an adjusting cavity, a spring, an inlet pipe connecting end, an outlet pipe connecting end, a front limiting pin and a rear limiting pin, wherein the inlet pipe connecting end and the outlet pipe connecting end are arranged on the upper portion and the lower portion of the liquid storage cavity respectively, the liquid storage cavity is isolated from the adjusting cavity through the piston, the piston is connected with the spring, and the front limiting pin and the rear limiting pin limit the moving position of the piston.
Further, the liquid storage cavity is connected between the outlet of the condenser and the inlet of the throttling device through an inlet connecting pipe end and an outlet connecting pipe end.
Furthermore, the device also comprises a low-pressure connecting pipe, and the adjusting cavity is connected with an outlet pipeline of the throttling device through the low-pressure connecting pipe.
Furthermore, the self-operated capacity adjusting liquid storage device adopts an external heat preservation measure.
Furthermore, the heat pipe with the self-operated capacity regulating reservoir and each structure in the vapor compression composite system are sequentially connected through a refrigerant pipeline to form a closed system, and the refrigerant pipeline is filled with refrigerant.
Further, the elastic force of the spring is larger than the friction force for pushing the piston and smaller than the pushing force formed by the difference value of the condensing pressure and the evaporating pressure.
The invention has the following beneficial effects:
(1) the self-operated capacity adjusting liquid storage device can ensure that the heat pipe mode and the vapor compression mode work under the respective optimal refrigerant charge amount, and ensure that the heat pipe mode and the vapor compression mode run efficiently;
(2) the system changes the capacity of the liquid storage device by utilizing the power of the compressor in a self-operated manner, does not need external power, is simple and convenient to control and works stably and reliably;
(3) the composite system keeps the self-adjusting performance that the heat pipe can automatically adjust the flow according to the heat load while using the liquid storage device.
Description of the drawings:
fig. 1 is a schematic structural diagram of a heat pipe and vapor compression composite system with a self-operated capacity regulating reservoir according to the present invention.
Fig. 2 is a flow chart of a heat pipe and vapor compression composite system with a self-operated capacity regulating reservoir according to the present invention.
Fig. 3 is a vapor compression flow chart of the heat pipe and vapor compression composite system with self-operated capacity regulating reservoir of the present invention.
Wherein:
1-self-operated capacity regulating reservoir; 2-an evaporator; 3-a compressor; 4-a condenser; 5-a throttling device; 6-a first bypass valve; 7-a second bypass valve; 8-low pressure connecting pipe; 11-a liquid storage cavity; 12-a piston; 13-a regulating cavity; 14-a spring; 15-the inlet is connected with the pipe end; 16-an outlet connecting pipe end; 17-a front limit pin; 18-rear limit pin.
The specific implementation mode is as follows:
the invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the heat pipe and vapor compression composite system with a self-operated capacity adjustment reservoir of the present invention includes an evaporator 2, a compressor 3, a condenser 4, a throttling device 5, a first bypass valve 6 connected in parallel with the compressor 3, and a second bypass valve 7 connected in parallel with the throttling device 5, wherein the self-operated capacity adjustment reservoir 1 is disposed on an outlet pipeline of the condenser 4. The self-operated capacity adjusting liquid storage device 1 comprises a liquid storage cavity 11, a piston 12, an adjusting cavity 13, a spring 14, an inlet connecting pipe end 15, an outlet connecting pipe end 16, a front limit pin 1 and a rear limit pin 18; the liquid storage cavity 11 is connected between the outlet of the condenser 4 and the inlet of the throttling device 5 through an inlet pipe end 15 and an outlet pipe end 16, the liquid storage cavity 11 and the adjusting cavity 13 are separated through a piston 12, the piston 12 is connected with a spring 14, a front limiting pin 17 and a rear limiting pin 18 limit the moving position of the piston 12, and the adjusting cavity 13 is connected with the outlet of the throttling device 5 through a low-pressure connecting pipe 8. The pressure of the liquid storage cavity is the outlet pressure of the condenser, and the pressure of the adjusting cavity is the outlet pressure of the throttling device. The whole self-operated capacity adjusting liquid storage device 1 adopts an external heat preservation measure. Under different operation modes of the system, the piston 12 is driven by self-operated pressure difference established by the compressor, so that the volume of the liquid storage cavity 11 is changed, and the matching requirement of the refrigerant charging amount is met on the basis of realizing the switching of the working modes.
The heat pipe with the self-operated capacity adjusting reservoir is connected with each device in the vapor compression composite system through a refrigerant pipeline in sequence to form a closed system, and the refrigerant pipeline is filled with refrigerant.
The working principle of the heat pipe and vapor compression composite system with the self-operated capacity regulating reservoir is as follows:
(a) when the system runs in a heat pipe mode, the compressor 3 and the throttling device 5 are closed, the first bypass valve 6 and the second bypass valve 7 are opened, the internal pressures of the liquid storage cavity 11 and the adjusting cavity 13 of the self-operated capacity adjusting liquid storage device 1 are approximately equal, the piston 12 is pushed to the front limiting pin 17 under the action of the elastic force of the spring 14, the volume of the liquid storage cavity 11 is reduced, most of refrigerant in the system enters the heat pipe for circulation, and meanwhile, the self-operated capacity adjusting liquid storage device 1 is used as a descending pipe section to participate in the heat pipe circulation, so that the efficient operation of the heat pipe circulation is guaranteed, as shown in fig..
(b) When the system operates in the vapor compression mode, the first bypass valve 6 and the second bypass valve 7 are closed, the compressor 3 and the throttling device 5 are opened, at the moment, the interior of the liquid storage cavity 11 of the self-operated capacity adjusting liquid storage device 1 is at condensing pressure, the adjusting cavity 13 of the liquid storage device is at evaporating pressure, and the pressure difference between the two is larger and is usually larger than 2 bar. Under the action of the pressure difference between the condensing pressure and the evaporating pressure, the spring 14 is extruded, the piston 12 is pushed to the rear limit pin 18, the volume of the liquid storage cavity 11 of the self-operated capacity adjusting liquid storage device 1 is increased, redundant refrigerant is stored in the liquid storage device, only less refrigerant participates in the vapor compression cycle, and the efficient operation of the vapor compression cycle is guaranteed, as shown in fig. 3.
It should be noted that the spring force of the spring 14 should be greater than the friction force pushing the piston 12, and less than the pushing force created by the difference between the condensing pressure and the evaporating pressure. The volume of the self-operated capacity adjusting accumulator 1, the positions of the front limit pin 17 and the rear limit pin 18 and the initial refrigerant charge amount are determined according to actual conditions so as to ensure that the heat pipe mode and the vapor compression mode are in the optimal charge amount. For example, the optimal charge for the heat pipe mode is 500g, the charge for the vapor compression mode is 300g, and the initial charge can be 600g, and the front limit pin 17 and the rear limit pin 18 can be positioned so that the liquid storage cavity can contain 300g of refrigerant at most and 100g of refrigerant at least. Therefore, the refrigerant in the liquid storage cavity is about 100g, and the refrigerant in the heat pipe circulation is about 500 g; in the vapor compression mode, about 300g of refrigerant in the reservoir chamber and about 300g of refrigerant in the vapor compression cycle are present.
In addition, in the heat pipe and vapor compression composite system, the condenser 4 is higher than the evaporator 2, and the self-operated capacity regulating reservoir 1 should be installed at the outlet of the condenser to maintain a certain height difference with the evaporator 2, so as to form a driving liquid column in the heat pipe mode.
The foregoing is only a preferred embodiment of this invention and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the invention and these modifications should also be considered as the protection scope of the invention.
Claims (6)
1. The utility model provides a take heat pipe and vapor compression composite system of formula capacity control reservoir of relying on oneself which characterized in that: the condenser comprises an evaporator (2), a compressor (3), a condenser (4), a throttling device (5), a first bypass valve (6) connected with the compressor (3) in parallel and a second bypass valve (7) connected with the throttling device (5) in parallel, wherein a self-operated capacity adjusting liquid storage device (1) is arranged on an outlet pipeline of the condenser (4);
self-operated capacity control reservoir (1) connects pipe end (15), export to connect pipe end (16), preceding spacer pin (17) and back spacer pin (18) including stock solution chamber (11), piston (12), regulation chamber (13), spring (14), import, stock solution chamber (11) set up respectively from top to bottom import and connect pipe end (15) and export to connect pipe end (16), stock solution chamber (11) and regulation chamber (13) are separated through piston (12), piston (12) are connected with spring (14), preceding spacer pin (17) and back spacer pin (18) restriction piston (12) shift position.
2. The heat pipe and vapor compression composite system with self-contained capacity-regulating reservoir of claim 1, wherein: the liquid storage cavity (11) is connected between the outlet of the condenser (4) and the inlet of the throttling device (5) through an inlet connecting pipe end (15) and an outlet connecting pipe end (16).
3. The heat pipe and vapor compression composite system with self-contained capacity-regulating reservoir of claim 1, wherein: the device is characterized by further comprising a low-pressure connecting pipe (8), and the adjusting cavity (13) is connected with an outlet pipeline of the throttling device (5) through the low-pressure connecting pipe (8).
4. The heat pipe and vapor compression composite system with self-contained capacity-regulating reservoir of claim 1, wherein: the self-operated capacity adjusting liquid storage device (1) adopts an external heat preservation measure.
5. The heat pipe and vapor compression composite system with self-contained capacity-regulating reservoir of claim 1, wherein: the heat pipe with the self-operated capacity adjusting reservoir is connected with each structure in the vapor compression composite system through a refrigerant pipeline in sequence to form a closed system, and the refrigerant pipeline is filled with refrigerant.
6. The heat pipe and vapor compression composite system with self-contained capacity-regulating reservoir of claim 1, wherein: the elastic force of the spring (14) is larger than the friction force for pushing the piston (12) and smaller than the pushing force formed by the difference value of the condensing pressure and the evaporating pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010527429.1A CN111678270A (en) | 2020-06-11 | 2020-06-11 | Heat pipe and vapor compression composite system with self-operated capacity adjusting liquid reservoir |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010527429.1A CN111678270A (en) | 2020-06-11 | 2020-06-11 | Heat pipe and vapor compression composite system with self-operated capacity adjusting liquid reservoir |
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| CN111678270A true CN111678270A (en) | 2020-09-18 |
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| CN202010527429.1A Pending CN111678270A (en) | 2020-06-11 | 2020-06-11 | Heat pipe and vapor compression composite system with self-operated capacity adjusting liquid reservoir |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325685A (en) * | 2020-11-12 | 2021-02-05 | 上海交通大学 | But automatically regulated fills separated heat pipe that volume distributes |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325685A (en) * | 2020-11-12 | 2021-02-05 | 上海交通大学 | But automatically regulated fills separated heat pipe that volume distributes |
| CN112325685B (en) * | 2020-11-12 | 2021-07-16 | 上海交通大学 | But automatically regulated fills separated heat pipe that volume distributes |
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