CN212109071U

CN212109071U - Micro-channel heat exchanger and heat pump system with same

Info

Publication number: CN212109071U
Application number: CN202020327334.0U
Authority: CN
Inventors: 王凯; 吴迎文; 杨瑞琦; 马腾飞; 郭忠玉; 王雪东; 康宁; 尹东
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-12-08
Anticipated expiration: 2030-03-16

Abstract

The utility model provides a microchannel heat exchanger and have its heat pump system, the microchannel heat exchanger includes: the fluid collecting device comprises a collecting pipe (1) and an inner inserting pipe (2), wherein the inner inserting pipe (2) is inserted into an inner cavity (10) of the collecting pipe and can lead fluid into the inner cavity of the collecting pipe (1) or lead the fluid in the inner cavity of the collecting pipe (1) out through the inner inserting pipe (2), the part, extending into the inner cavity, of the inner inserting pipe (2) is bent and extends upwards, a pipe section at or close to the free end of the inner inserting pipe (2) is formed into a tapered pipe section (21), the tapered pipe section (21) is formed into a pipe section with the cross section gradually reduced from bottom to top, and the free end is provided with a plurality of injection holes (22). According to the utility model discloses can effectively improve the flow velocity of refrigerant, increase the abundant degree of mixture of refrigerant after the jet orifice blowout, help improving the phenomenon of the easy layering of the double-phase refrigerant of gas-liquid.

Description

Micro-channel heat exchanger and heat pump system with same

Technical Field

The utility model relates to a heat transfer technical field, concretely relates to microchannel heat exchanger and have its heat pump system.

Background

The micro-channel heat exchanger is a novel efficient heat exchanger and has the advantages of high heat transfer efficiency, small volume, light weight, small filling amount and the like. When the microchannel heat exchanger is used as an evaporator, an inlet is generally in a gas-liquid two-phase state, a collecting pipe of the traditional microchannel heat exchanger has no flow dividing measure, and the gas-liquid two-phase layering phenomenon is obvious after the gas-liquid two-phase layering phenomenon enters the collecting pipe, so that the refrigerant entering the flat pipe is unevenly distributed, and the heat exchange performance of the heat exchanger is poor.

Patent CN203798032U provides a microchannel heat exchanger with an inner insert tube having a header with uniform flow holes, and a plurality of dividing plates are provided, so that the refrigerant flowing out from the flow holes of the inner insert tube uniformly flows into the space formed between the dividing plates, thereby improving the uniformity of refrigerant distribution and the heat exchange efficiency of the heat exchanger. However, the inner insertion tube structure of the scheme is a straight round tube, and although the inner insertion tube structure can have a certain flow dividing improvement effect on the gas-liquid two-phase refrigerant at the inlet, the possibility of layering of the refrigerant at the outlet still exists.

Because the microchannel heat exchanger among the prior art uses as the evaporimeter, the import is generally double-phase for the gas-liquid, gets into behind the pressure manifold gas-liquid double-phase stratification phenomenon obvious, leads to getting into the refrigerant distribution of flat pipe inhomogeneous, and the relatively poor class of technical problem of heat exchanger heat transfer performance, consequently the utility model discloses research design a microchannel heat exchanger and have its heat pump system.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the import of the microchannel heat exchanger among the prior art and getting into behind the pressure manifold double-phase layering phenomenon of gas-liquid obvious, and the refrigerant distribution that leads to getting into flat pipe is inhomogeneous, the relatively poor defect of heat exchanger heat transfer performance to a microchannel heat exchanger and have its heat pump system is provided.

In order to solve the above problem, the utility model provides a microchannel heat exchanger, it includes:

the flow pipe comprises a collecting pipe and an inner inserting pipe, wherein the inner inserting pipe is inserted into the inner cavity of the collecting pipe and can lead fluid into the inner cavity of the collecting pipe or lead the fluid in the inner cavity of the collecting pipe out through the inner inserting pipe, the part of the inner inserting pipe extending into the inner cavity is bent and extends upwards, and a pipe section at the free end of the inner inserting pipe or close to the free end is formed into a tapered pipe section, so that the tapered pipe section is formed into a pipe section with a gradually-reduced cross section from bottom to top, and the free end is provided with a plurality of injection holes.

Preferably, the first and second electrodes are formed of a metal,

the free end is a first straight pipe section, the plurality of injection holes are formed in the peripheral wall of the first straight pipe section and are communicated with the interior of the first straight pipe section, and meanwhile, at least one injection hole is formed in the top end of the first straight pipe section; the upper end of the reducing pipe section is connected with the first straight pipe section, the reducing pipe section and the first straight pipe section are communicated with each other, and/or the reducing pipe section is a spray pipe with the outer wall in smooth curved surface transition.

Preferably, the first and second electrodes are formed of a metal,

the collecting pipe extends along the vertical direction and comprises a plurality of inner cavities, the inner cavities are sequentially connected up and down, at least one partition plate is arranged in the collecting pipe, and the adjacent inner cavities are separated through the partition plates.

Preferably, the first and second electrodes are formed of a metal,

one of said inner cannulae is disposed in each of said lumens.

Preferably, the first and second electrodes are formed of a metal,

the inner insert tube further comprises a second straight tube section disposed at a lower end of the tapered tube section and communicating with an interior of the tapered tube section.

Preferably, the first and second electrodes are formed of a metal,

the second straight pipe section is longer than the first straight pipe section.

Preferably, the first and second electrodes are formed of a metal,

the inner inserting pipe further comprises an outer pipe section located outside the collecting pipe, one end of the outer pipe section is communicated with the second straight pipe section, and the other end of the outer pipe section can be communicated with the flow divider.

Preferably, the first and second electrodes are formed of a metal,

still include at least one flat pipe, flat pipe one end insert in the inner chamber of pressure manifold and with the inner chamber intercommunication, and every the inner chamber sets up two at least flat pipes correspondingly, and is adjacent have between the flat pipe and predetermine the interval.

Preferably, the first and second electrodes are formed of a metal,

the other end of the flat pipe is inserted into the second collecting pipe, and the second collecting pipe is further communicated with an air inlet pipe.

The utility model also provides a heat pump system, it includes preceding arbitrary the microchannel heat exchanger, still include compressor, throttling arrangement and second heat exchanger, the compressor the second heat exchanger throttling arrangement with the microchannel heat exchanger communicates in proper order.

The utility model provides a pair of microchannel heat exchanger and have its heat pump system has following beneficial effect:

the utility model discloses an insert interior intubate in the inner chamber of pressure manifold, and interior intubate's free end or the pipeline section that is close to the free end form to by the convergent pipeline section that supreme cross-sectional area reduces gradually down, can effectively improve the flow velocity of refrigerant through the pipeline section cross section of convergent, thereby strengthen the abundant degree of mixture of refrigerant after the jet orifice blowout, the injection effect is better, the refrigerant that comes out from the convergent pipe is vaporific droplet, help improving the phenomenon of the easy layering of the double-phase refrigerant of gas-liquid, make the double-phase refrigerant that gets into in flat pipe can obtain the distribution more evenly, effectively improve the heat transfer performance in flat pipe, the heat transfer effect is improved.

Drawings

Fig. 1 is a schematic structural diagram of the microchannel heat exchanger of the present invention;

FIG. 2 is a partially enlarged structural view of portion A in FIG. 1;

FIG. 3 is a perspective view of an inner insert tube of the microchannel heat exchanger according to the present invention;

FIG. 4 is a partially enlarged structural view of a portion B in FIG. 3;

fig. 5 is a system cycle diagram of the heat pump system with the microchannel heat exchanger according to the present invention.

The reference numerals are represented as:

1. a header pipe; 10. an inner cavity; 11. a partition plate; 2. inserting a tube; 21. a tapered pipe section; 22. an injection hole; 23. a first straight pipe section; 24. a second straight tube section; 25. an outer tube section; 3. flat tubes; 4. a second header; 5. an air inlet pipe; 6. a flow divider; 7. a compressor; 8. a throttling device; 9. a second heat exchanger; 100. a microchannel heat exchanger; 200. and a four-way valve.

Detailed Description

As shown in fig. 1-5, the utility model provides a microchannel heat exchanger, it includes:

the fluid collecting device comprises a collecting pipe 1 and an inner inserting pipe 2, wherein the inner inserting pipe 2 is inserted into an inner cavity 10 of the collecting pipe and can lead fluid into the inner cavity of the collecting pipe 1 or lead the fluid in the inner cavity of the collecting pipe 1 out through the inner inserting pipe 2, the part of the inner inserting pipe 2 extending into the inner cavity is bent and extends upwards, and a pipe section at or close to the free end of the inner inserting pipe 2 is formed into a tapered pipe section 21, so that the tapered pipe section 21 is formed into a pipe section with a gradually-reduced cross section from bottom to top, and a plurality of injection holes 22 are formed in the free end.

Preferably, the first and second electrodes are formed of a metal,

the free end is a first straight pipe section 23, the plurality of injection holes 22 are formed in the peripheral wall of the first straight pipe section 23 and communicated with the interior of the first straight pipe section 23, and at least one injection hole 22 is formed in the top end of the first straight pipe section 23; the upper end of the tapered pipe section 21 is connected with the first straight pipe section 23, the tapered pipe section 21 and the first straight pipe section 23 are communicated with each other, and/or the tapered pipe section 21 is a spray pipe with a smooth curved surface transition outer wall. This is the utility model discloses an optimal configuration form of convergent pipe section, its setting lies in the position that the free end meets promptly, and the free end is used for setting up the jet orifice in order to spout the refrigerant to the inner chamber of pressure manifold, and the convergent pipe section is the spray tube of smooth curved surface transition, can carry out the effect of speeding to the refrigerant effectively, and speed progressively promotes, can effectively strengthen the mixture between the double-phase refrigerant of gas-liquid.

Preferably, the first and second electrodes are formed of a metal,

the collecting pipe 1 extends in the vertical direction and comprises a plurality of inner cavities 10, the inner cavities 10 are sequentially connected from top to bottom, at least one partition plate 11 is arranged inside the collecting pipe 1, and the adjacent inner cavities 10 are separated through the partition plates 11. This is the utility model discloses a preferred structural style of a plurality of inner chambers of pressure manifold can effectively form a plurality of inner chambers through the setting of a plurality of baffles, and the vertical direction of pressure manifold extends and makes the inner chamber arrange in proper order from top to bottom, and the export free end of interior intubate is arranged up and is made the spun refrigerant blowout up, further makes the double-phase effective mixture of gas-liquid, prevents when spraying down that the liquid phase refrigerant is because density is great and the deposit is in the below to can further improve double-phase degree of consistency that mixes.

Preferably, the first and second electrodes are formed of a metal,

one of said inner cannulas 2 is disposed in each of said inner lumens 10. This is the utility model discloses a further preferred structural style, every inner chamber all sets up an interior intubate correspondingly promptly and can effectively carry out leading-in fluidic effect to every inner chamber, perhaps can derive the refrigerant to every inner chamber homoenergetic.

Preferably, the first and second electrodes are formed of a metal,

the inner insert tube 2 further comprises a second straight tube section 24, the second straight tube section 24 being provided at the lower end of the tapered tube section 21 and communicating with the interior of the tapered tube section 21. This is the utility model discloses a further preferred structural style of intubate can connect the convergent pipeline section and effectively communicate it with the outside through second straight tube section, switches on the fluid effect and leads the refrigerant of bottom up to upper end and spun effect, improves the homogeneous mixing degree of the double-phase refrigerant of gas-liquid.

Preferably, the second straight tube section 24 is longer than the first straight tube section 23. The second straight pipe section is mainly used for conducting fluid and guiding the refrigerant at the bottom upwards to the upper end and spraying out, and the first straight pipe section is mainly used for discharging the refrigerant, and the relationship between the first straight pipe section and the second straight pipe section is set to be the function capable of enhancing the upward conduction.

Preferably, the inner insert tube 2 further comprises an outer tube section 25 located outside the header 1, one end of the outer tube section 25 being in communication with the second straight tube section 24, and the other end being further in communication with the flow divider 6. This is a further preferable configuration of the inner insert tube of the present invention, and the outer tube section can conduct the external refrigerant to the second straight tube section through the outer tube section.

Preferably, the first and second electrodes are formed of a metal,

still include at least one flat pipe 3, flat pipe 3 one end insert the pressure manifold 1 in the inner chamber 10 and with inner chamber 10 intercommunication, and every inner chamber 10 sets up two at least flat pipes 3 correspondingly, and is adjacent have between the flat pipe 3 and predetermine the interval. Through flat pipe and with two at least flat pipes of inner chamber intercommunication can be effectively with the refrigerant water conservancy diversion in the pressure manifold to flat intraduct to accomplish the effect of carrying out the heat exchange on flat pipe.

Preferably, the heat exchanger further comprises a second collecting pipe 4, the other end of the flat pipe 3 is inserted into the second collecting pipe 4, and the second collecting pipe 4 is further communicated with an air inlet pipe 5. Can make the other end of flat pipe effectively communicate through the second pressure manifold to lead the refrigerant after the heat transfer is accomplished in the flat pipe to the second pressure manifold and discharge, or lead the external refrigerant through this second pressure manifold and carry out the heat transfer in the flat pipe.

The utility model also provides a heat pump system, it includes preceding arbitrary microchannel heat exchanger 100, still include compressor 7, throttling arrangement 8 and second heat exchanger 9, compressor 7 second heat exchanger 9 throttling arrangement 8 with microchannel heat exchanger 100 communicates in proper order.

The utility model discloses an adopt the form of interpolation reducing pipe in the microchannel heat exchanger collector, can improve the velocity of flow of refrigerant, the refrigerant that comes out from interpolation reducing pipe and gets into every collector cavity is vaporific droplet, improves the phenomenon of the double-phase refrigerant layering of gas-liquid in the collector, is favorable to the reposition of redundant personnel evenly, improves the heat transfer performance of heat exchanger. Compared with a common round straight inserted copper tube, the inserted tube in the reducing tube section has the advantages that the flow velocity of the refrigerant in the tube is improved, the spraying effect is good, the refrigerant outlet is vaporific, the speed is high, and the split flow is uniform.

Fig. 1 is the schematic structural diagram of the microchannel heat exchanger of the present invention. The utility model discloses a micro-channel heat exchanger, which mainly comprises an inner insert pipe 2 with a reducing pipe section 21, a flat pipe 3, a left collecting pipe (a second collecting pipe 4) and an air inlet/outlet pipe (an air inlet pipe 5); a partition 11 and a right header (header 1). The collecting pipe 1 is divided into N cavities, each cavity comprises an inner inserting pipe 2, and the refrigerant is divided into N paths from the flow divider and flows to each cavity.

Fig. 2 is a schematic diagram of the internal structure of a chamber of the right collecting pipe of the microchannel heat exchanger of the present invention. When the heat exchanger is used as an evaporator, a gas-liquid two-phase refrigerant enters the microchannel heat exchanger through the L-shaped inner inserting tube 2, flows through a section of long straight tube section firstly, then passes through the tapered tube section 21, and finally is sprayed into the right collecting tube cavity (inner cavity 10) in the form of mist small droplets through the spraying holes 22 (small holes) formed in the periphery and the top end of the first straight tube section 23. The flow velocity of the gas-liquid two-phase refrigerant is increased after passing through the reducing pipe section 21, the flow velocity of the refrigerant is larger, the pressure of the reducing pipe section 21 is larger (the top end is approximately closed, the refrigerant after being accelerated by the reducing pipe can reach high pressure at the outlet of the reducing pipe due to high-speed movement, and the refrigerant is more beneficial to converting from gas phase to liquid phase), and the gas phase in the gas-liquid two-phase refrigerant is beneficial to converting into liquid phase, so that the dryness of the two-phase refrigerant is reduced, and finally the refrigerant is ejected from the small holes (the ejection holes 22) of the reducing pipe in the form of atomized small droplets, so that the phenomenon of uneven distribution caused by easy layering of the gas-.

Fig. 3-4 are the structure diagrams of the inserted reducer of the microchannel heat exchanger of the present invention. The straight open section and the top open section of the reducer are provided with small holes, and finally the refrigerant is sprayed out in the form of mist small drops through the small holes.

Fig. 5 is a heat pump system of microchannel heat exchanger according to the present invention, which includes microchannel heat exchanger 100, throttling device 8, second heat exchanger 9, four-way valve 200, compressor 7 and splitter 6, and the above components are interconnected through pipelines.

When the microchannel heat exchanger is used as a condenser, a of the four-way valve 200 is communicated with b, c is communicated with d, a refrigerant discharged from the compressor 7 passes through the four-way valve 200, then enters the microchannel heat exchanger 100 for condensation and heat release, then flows out in N paths through the right collecting pipe, enters the throttling device 8 for throttling after being converged by the flow divider 6, then enters the second heat exchanger 9 for evaporation and heat absorption, and then returns to the compressor 7 through the four-way valve 200 to complete circulation.

When the microchannel heat exchanger is used as an evaporator, the ac and bd of the four-way valve 200 are communicated, refrigerant discharged from the compressor 7 enters the second heat exchanger 9 through the four-way valve 200 to be condensed and released heat, then enters the throttling device 8 to be throttled, then is shunted into N paths through the shunt 6 to enter the microchannel heat exchanger 100 to be evaporated and absorbed heat, then flows out from the outlet of the left collecting pipe, and finally returns to the compressor 7 through the four-way valve 200 to complete circulation.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A microchannel heat exchanger, characterized in that: the method comprises the following steps:

the fluid collecting device comprises a collecting pipe (1) and an inner inserting pipe (2), wherein the inner inserting pipe (2) is inserted into an inner cavity (10) of the collecting pipe and can lead fluid into the inner cavity of the collecting pipe (1) or lead the fluid in the inner cavity of the collecting pipe (1) out through the inner inserting pipe (2), the part, extending into the inner cavity, of the inner inserting pipe (2) is bent and extends upwards, a pipe section at or close to the free end of the inner inserting pipe (2) is formed into a tapered pipe section (21), the tapered pipe section (21) is formed into a pipe section with the cross section gradually reduced from bottom to top, and the free end is provided with a plurality of injection holes (22).

2. The microchannel heat exchanger of claim 1, wherein:

the free end is a first straight pipe section (23), a plurality of injection holes (22) are formed in the peripheral wall of the first straight pipe section (23) and communicated with the interior of the first straight pipe section, and at least one injection hole (22) is formed in the top end of the first straight pipe section (23); the upper end of the tapered pipe section (21) is connected with the first straight pipe section (23) and the tapered pipe section (21) is communicated with the inside of the first straight pipe section and/or the tapered pipe section (21) is a spray pipe with a smooth and curved transition outer wall.

3. The microchannel heat exchanger of claim 1, wherein:

the collecting pipe (1) extends along the vertical direction and comprises a plurality of inner cavities (10), the inner cavities (10) are sequentially connected from top to bottom, at least one partition plate (11) is arranged inside the collecting pipe (1), and the adjacent inner cavities (10) are separated through the partition plates (11).

4. The microchannel heat exchanger of claim 3, wherein:

one inner cannula (2) is arranged in each inner cavity (10).

5. The microchannel heat exchanger of any one of claims 1-4, wherein:

the inner insert tube (2) further comprises a second straight tube section (24), the second straight tube section (24) being arranged at the lower end of the tapered tube section (21) and communicating with the interior of the tapered tube section (21).

6. The microchannel heat exchanger of claim 5, wherein:

when the free end is a first straight pipe section (23), the length of the second straight pipe section (24) is larger than that of the first straight pipe section (23).

7. The microchannel heat exchanger of claim 5, wherein:

the inner inserting pipe (2) further comprises an outer pipe section (25) located outside the collecting pipe (1), one end of the outer pipe section (25) is communicated with the second straight pipe section (24), and the other end of the outer pipe section can be communicated with the flow divider (6).

8. The microchannel heat exchanger of any one of claims 1-4, wherein:

still include at least one flat pipe (3), flat pipe (3) one end insert in pressure manifold (1) in inner chamber (10) and with inner chamber (10) intercommunication, and every inner chamber (10) set up two at least flat pipes (3) correspondingly, it is adjacent have between flat pipe (3) and predetermine the interval.

9. The microchannel heat exchanger of claim 8, wherein:

still include second pressure manifold (4), the other end of flat pipe (3) inserts in second pressure manifold (4), just second pressure manifold (4) still communicate and are provided with intake pipe (5).

10. A heat pump system, characterized by: comprising the microchannel heat exchanger (100) of any one of claims 1-9, further comprising a compressor (7), a throttling device (8) and a second heat exchanger (9), the compressor (7), the second heat exchanger (9), the throttling device (8) and the microchannel heat exchanger (100) being in communication in sequence.