CN105674629A - Microchannel heat exchanger and heat-pump water heater - Google Patents

Abstract

The invention relates to a microchannel heat exchanger.The microchannel heat exchanger comprises a first collecting pipe (1), a second collecting pipe (2) and a pipe bundle (3), wherein the pipe bundle (3) is arranged between the first collecting pipe (1) and the second collecting pipe (2), the pipe bundle (3) comprises at least two pipes arranged on fluid flow in parallel, and an opening is formed between either the working medium inlet end or the working medium outlet end of each pipe and the corresponding first collecting pipe (1) or second collecting pipe (2), so that fluid communication of a working medium is achieved in the first collecting pipe (1), the second collecting pipe (2) and the pipe bundle (3); the pipe bundle (3) is constructed in the way that in the working state of the microchannel heat exchanger, for two adjacent pipes in the pipe bundle (3), the flow area of the opening in the working medium inlet end of the upper first pipe is larger than that of the opening in the working medium inlet end of the lower second pipe.In this way, the working medium can flow into the upper pipe more easily after flowing into the pipe bundle, so that the defect that the working medium is not distributed uniformly in the pipes is overcome.

Description

Micro-channel heat exchanger and Teat pump boiler

Technical field

The present invention relates to technical field of heat exchange, particularly relate to a kind of micro-channel heat exchanger and Teat pump boiler.

Background technology

Teat pump boiler is different from usual heat exchanger, and it adopts micro-channel heat exchanger to carry out heat exchange. Owing to the aperture area in passage aperture is less, therefore the heat and mass of minitype channel and flowing also exist special " dimensional effect ", and this is mainly manifested in:

1, thermal inertia reduces with size and reduces. The reduction of thermal inertia makes the process of more difficult realization under stock size, such as phase transition process, it is possible to realize in the short time under miniature scale.

2, heat flow density is bigger. Research shows, when flow size little to 0.5mm～1mm time, convection transfer rate can increase 50%～100%. Thus employing micro-channel heat exchanger, heat exchange efficiency can be effectively improved, reduce the charging amount of system refrigerant and alleviate water tank overall weight.

But, time in prior art by micro-channel heat exchanger using heat pump water heater, there is also unequal and that microchannel flow velocity the is uneven up and down problem of refrigerant flow distribution. Each runner flow distribution inequality directly contributes the skewness of its heat exchange cross-section temperature field, velocity field, and then causes the problem that water tank water temperature is layered up and down.

Therefore, how to improve the problem that in prior art, in Teat pump boiler micro-channel heat exchanger, distribution of refrigerant is uneven, become those skilled in the art's important technological problems to be solved.

Summary of the invention

It is an object of the invention to provide a kind of micro-channel heat exchanger and Teat pump boiler, it is possible to improve the problem that in prior art micro-channel heat exchanger, distribution of refrigerant is uneven.

For achieving the above object, a kind of micro-channel heat exchanger is provided, including the first header, the second header and at least one pipe group, pipe group is arranged between the first header and the second header, pipe group includes at least two pipe being arranged in parallel on fluid flows, it is provided with opening so that working medium is in fluid communication in the first header, the second header and pipe group between corresponding to the first header and the second header one of one of the working medium arrival end and sender property outlet end of each pipe; And wherein pipe group is configured to: under the duty of micro-channel heat exchanger, the circulation area of the opening at the working medium arrival end place of first pipe above of adjacent two pipes of Guan Zuzhong is more than the circulation area of the opening at the working medium arrival end place of the second pipe being positioned below.

Alternatively, opening is arranged on the sidewall of the first header and the second header.

Alternatively, opening is arranged in the respective end of each pipe of Guan Zuzhong.

Alternatively, the latus rectum of the first pipe is more than the latus rectum of the second pipe.

Alternatively, the opening of each pipe of Guan Zuzhong all includes at least two aperture.

Alternatively, the area in arbitrary aperture of the first pipe is all higher than the area in arbitrary aperture of the second pipe.

Alternatively, the edge in aperture is provided with jog, for increasing the contact area of working medium and pipe.

Alternatively, pipe group including at least two serial communication, it is equipped with dividing plate inside first header and the second header, dividing plate is between two adjacent tubes groups, for stopping the Working fluid flow in the first header and the second header, it is positioned at the dividing plate within the first header and is positioned at the dividing plate interlaced arrangement within the second header, so that working medium forms S shape flow path between at least two pipe group.

Alternatively, manage as flat tube.

It addition, the present invention also provides for a kind of Teat pump boiler, including above-mentioned micro-channel heat exchanger.

Alternatively, micro-channel heat exchanger is condenser or vaporizer.

Based on technique scheme, in the micro-channel heat exchanger of the present invention, it is provided with opening between corresponding to the first header and the second header one of one of the working medium arrival end and sender property outlet end of each pipe of pipe group, in adjacent two pipes of Guan Zuzhong, the circulation area of the opening at the working medium arrival end place of the first pipe above is more than the circulation area of the opening at the working medium arrival end place of the second pipe being positioned below. So, when working medium is flowed into pipe group by the first header or the second header, it is easier to flow in the opening that circulation area is bigger, to avoid working medium only to flow in the Guan Zuzhong pipe being positioned below due to gravity, and the problem causing Guan Zuzhong working medium skewness.

Accompanying drawing explanation

Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application, and the schematic description and description of the present invention is used for explaining the present invention, is not intended that inappropriate limitation of the present invention. In the accompanying drawings:

Fig. 1 is the structural representation of one embodiment of micro-channel heat exchanger of the present invention.

Fig. 2 is the structural representation of the end cross-sectional of same each pipe of Guan Zuzhong of one embodiment of micro-channel heat exchanger of the present invention.

Fig. 3 is the structural representation in aperture in one embodiment of micro-channel heat exchanger of the present invention.

In figure: 1-the first header, 2-the second header, 3-pipe group, 4-dividing plate, 5-working medium import, 6-sender property outlet, 31-first manages, and 32-second manages, and 33-the 3rd manages, and 34-the 4th manages, 311-the first aperture, 321-the second aperture, 331-the 3rd aperture, 341-the 4th aperture, 312-jog.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in embodiment is clearly and completely described. Obviously, described embodiment is only a part of embodiment of the present invention, rather than whole embodiments. Based on embodiments of the invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.

In describing the invention, it will be appreciated that, term " " center ", " transverse direction ", " longitudinal direction ", " front ", " afterwards ", " left side ", " right side ", " on ", D score, " vertically ", " level ", " top ", " end ", " interior ", orientation or the position relationship of the instruction such as " outward " are based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that limiting the scope of the invention.

As it is shown in figure 1, be the structural representation of one embodiment of micro-channel heat exchanger of the present invention. This micro-channel heat exchanger, including the first header the 1, second header 2 and pipe group 3, pipe group 3 is arranged between the first header 1 and the second header 2, pipe group 3 includes at least two pipe being arranged in parallel on fluid communication, working medium arrival end and sender property outlet end at each pipe respectively and are provided with opening between the first header 1 and the second header 2 so that working medium is in fluid communication in first header the 1, second header 2 and pipe group 3.

Working medium (such as cold-producing medium) is entered the first header 1 by working medium entrance 5, then pass through the opening between one end of pipe group 3 and the first header 1 and enter pipe group 3, the working medium flowing to pipe group 3 other end is entered in the second header 2 by the opening between the other end and second header 2 of pipe group 3, is finally flowed out by sender property outlet 6.

The working medium arrival end of each pipe and sender property outlet end in pipe group 3 respectively and are provided with opening between the first header 1 and the second header 2, in adjacent two pipes in pipe group 3, the circulation area of the opening at the working medium arrival end place of the first pipe above is more than the circulation area of the opening at the working medium arrival end place of the second pipe being positioned below. So, when working medium is flowed into pipe group by the first header or the second header, it is easier to flow in the opening that circulation area is bigger, to avoid working medium only to flow in the Guan Zuzhong pipe being positioned below due to gravity, and the problem causing Guan Zuzhong working medium skewness.

Wherein, the circulation area of opening refers to opening aperture area in the vertical direction of working medium circulating direction. For a pipe, when open amount is one, this circulation area is often referred to the aperture area of this opening; When open amount is more than one, this circulation area then refers to total aperture area of all openings on this pipe.

Certainly, for the ease of the outflow of working medium, in pipe group 3, the sender property outlet end of each pipe can also carry out identical setting with working medium arrival end, it will be clear that for solve working medium skewness problem, this setting it is not necessary to.

Specifically, as shown in Figure 1, in micro-channel heat exchanger under in running order, it is pointed to the top (the upper and lower upper and lower with accompanying drawing itself here is to for reference) and the pipe group 3 being connected with working medium entrance 5, for the working medium arrival end of each pipe in this pipe group 3, right-hand member is the sender property outlet end of each pipe in pipe group 3 to left end (the left and right left and right direction with accompanying drawing itself here is for reference); And for the pipe group 3 being positioned at the top and the pipe group 3 that is connected with working medium entrance 5 is disposed adjacent, right-hand member is the working medium arrival end of each pipe in this pipe group 3, and left end is the sender property outlet end of each pipe in pipe group 3; Other pipe groups 3 the like, repeat no more here.

In vertical micro-channel heat exchanger as shown in Figure 1, owing to gravity affects, the working medium of the bottom being positioned at the first header 1 or the second header 2 is more, therefore relatively multiple working medium enter in pipe group 3 in pipe on the lower, and working medium is less in top pipe, the problem that therefore working medium skewness very easily occurs, thus the problem causing heat exchange inequality. After adopting the arranging of the present invention, namely in adjacent two pipes in pipe group 3, the circulation area of the opening at the working medium arrival end place of the first pipe above is more than the circulation area of the opening at the working medium arrival end place of the second pipe being positioned below, just can so that working medium more readily flow in square tube, the problem substantially improving working medium skewness.

For ease of arranging, it is alternatively but not limited to the opening circulation area at each plumber's matter arrival end place and uniformly reduces from top to bottom.

In the various embodiments described above, opening between first header 1 and the second header 2 and pipe group 3 can be arranged on the sidewall of the first header 1 and the second header 2, can also being arranged in pipe group 3 end of each pipe, being more prone to flow in the pipe of the first end as long as enabling to working medium.

Further, in adjacent two pipes of same pipe group 3, first pipe above along the latus rectum of working medium circulating direction more than the second pipe being positioned below latus rectum along working medium circulating direction, so can ensure that working medium can flow out more swimmingly after flowing to the first pipe, advantageously being uniformly distributed in working medium.

When opening is arranged on the end of each pipe in pipe group 3, in pipe group 3, the opening of each pipe could be arranged to one, it is also possible to is set to multiple. When opening has multiple, in adjacent two pipes in pipe group 3, total circulation area of the opening at the working medium arrival end place of the first pipe above is more than total circulation area of the opening at the working medium arrival end place of the second pipe being positioned below.

Alternatively, in pipe group 3, the opening of each pipe all includes at least two aperture, under ensureing the premise that total circulation area magnitude relationship meets above-mentioned setting, in pipe group 3, the area in each aperture of each pipe can be identical, can also be different, it is also possible in the pipe of close first end of permission, the area in part aperture is less than the area in part aperture in the pipe of the second end.

The shape in the aperture offered on each pipe in pipe group 3 can be arranged flexibly, such as could be arranged to rectangle, square, circle or other shapes.

In an optional embodiment, the area in first pipe any one aperture upper is all higher than on the second pipe the area in any one aperture, so can make to arrange convenient, and the personnel that can be easily installed quickly judge the size of total circulation area, it is simple to install.

It addition, the edge in aperture is circumferentially arranged multiple jog 312 along working medium circulating direction, for instance there is crenel shape, to increase the contact area of working medium and pipe, thus further enhancing the heat transfer effect of working medium.

As shown in Figure 1, micro-channel heat exchanger can be provided with the pipe group 3 of at least two serial communication, first header 1 and the second header 2 inside are equipped with dividing plate 4, dividing plate 4 is for stopping the Working fluid flow in the first header 1 and the second header 2, it is positioned at the dividing plate 4 within the first header 1 and is positioned at dividing plate 4 interlaced arrangement within the second header 2, so that working medium forms S shape passage at least two pipe group 3. Dividing plate 4 can lengthen the flow path of working medium, increases heat exchange area, improves heat transfer effect.

In the various embodiments described above, in pipe group 3, each pipe is alternatively but not limited to be set to flat tube, and namely the width of pipe is far longer than the height of pipe, and this pipe advantageously in forming Thermal Performance of Micro Channels, improves the coefficient of heat transfer, improves heat transfer effect.

Micro-channel heat exchanger in the various embodiments described above can apply in various heat transmission equipment, is particularly suitable in Teat pump boiler or air-conditioning, and micro-channel heat exchanger can as condenser, it is also possible to as vaporizer.

Concrete structure below in conjunction with 1～3 pair of micro-channel heat exchanger of the present invention of accompanying drawing and an optional embodiment of Teat pump boiler is described:

As shown in Figure 1, first header 1 is provided with working medium import 5, second header 2 is provided with sender property outlet 6, first header 1 and the second header 2 are additionally provided with the dividing plate 4 shifted to install, and working medium is subject to the obstruct of dividing plate 4, flow in pipe group 3, pipe group 3 is provided with at least two groups, make working medium form S shape passage in multiple pipe groups 3 by dividing plate 4, the back-haul of working medium can be increased, improve heat transfer effect.

In embodiment as shown in Figure 2, one of them pipe group 3 of this micro-channel heat exchanger includes four pipes, respectively the first pipe the 31, second pipe the 32, the 3rd pipe 33 and the 4th pipe 34 from top to bottom, these four Guan Shangjun offer multiple aperture, and the size in the aperture on each pipe is each identical, but the port size of four pipes is gradually reduced from top to bottom, namely the area in the first aperture 311 is maximum, taking second place in second aperture 321, more takes second place in the 3rd aperture 331, and the 4th aperture 341 is minimum. So, working medium more readily flows in the aperture of pipe above so that in same pipe group 3, the distribution of the working medium in four pipes is more uniform.

As it is shown on figure 3, on the edge in each aperture, be provided with multiple concaveconvex structure such as crenel shape along working medium circulating direction, to increase the heat exchange area of pipe and working medium.

Explanation by the multiple embodiments to micro-channel heat exchanger of the present invention and Teat pump boiler, it can be seen that micro-channel heat exchanger of the present invention and Teat pump boiler embodiment can solve the problem of working medium skewness in prior art, improves heat exchange efficiency.

Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit; Although the present invention being described in detail with reference to preferred embodiment, those of ordinary skill in the field are it is understood that still can modify to the specific embodiment of the present invention or portion of techniques feature carries out equivalent replacement; Without deviating from the spirit of technical solution of the present invention, it all should be encompassed in the middle of the technical scheme scope that the present invention is claimed.

Claims (11)

1. a micro-channel heat exchanger, it is characterized in that, including the first header (1), second header (2) and at least one pipe group (3), pipe group (3) is arranged between the first header (1) and the second header (2), pipe group (3) includes at least two pipe being arranged in parallel on fluid flows, it is provided with opening between one of the working medium arrival end and sender property outlet end and corresponding in the first header (1) and the second header (2) of each pipe, make working medium in the first header (1), flowing connection between second header (2) and pipe group (3), and

Wherein pipe group (3) is configured to: under the duty of micro-channel heat exchanger, and the circulation area of the opening at the working medium arrival end place of first pipe above of adjacent two pipes in pipe group (3) is more than the circulation area of the opening at the working medium arrival end place of the second pipe being positioned below.

2. micro-channel heat exchanger according to claim 1, it is characterised in that opening is arranged on the sidewall of the first header (1) and the second header (2).

3. micro-channel heat exchanger according to claim 1, it is characterised in that opening is arranged in pipe group (3) in the respective end of each pipe.

4. micro-channel heat exchanger according to claim 1, it is characterised in that the latus rectum of the first pipe is more than the latus rectum of the second pipe.

5. micro-channel heat exchanger according to claim 3, it is characterised in that in pipe group (3), the opening of each pipe all includes at least two aperture.

6. micro-channel heat exchanger according to claim 5, it is characterised in that the area in arbitrary aperture of the first pipe is all higher than the area in arbitrary aperture of the second pipe.

7. micro-channel heat exchanger according to claim 5, it is characterised in that the edge in aperture is provided with jog (312), for increasing the contact area of working medium and pipe.

8. micro-channel heat exchanger according to claim 1, it is characterized in that, pipe group (3) including at least two serial communication, first header (1) and the second header (2) inside are equipped with dividing plate (4), for stopping the Working fluid flow in the first header (1) and the second header (2), it is positioned at the dividing plate (4) of the first header (1) and is positioned at dividing plate (4) interlaced arrangement of the second header (2), so that working medium forms S shape flow path between at least two pipe group (3).

9. micro-channel heat exchanger according to claim 1, it is characterised in that described pipe is flat tube.

10. a Teat pump boiler, it is characterised in that include such as the micro-channel heat exchanger of any one of claim 1～9.

11. Teat pump boiler according to claim 10, it is characterised in that micro-channel heat exchanger is condenser or vaporizer.