WO2015113496A1

WO2015113496A1 - Board-type heat exchanger

Info

Publication number: WO2015113496A1
Application number: PCT/CN2015/071724
Authority: WO
Inventors: 魏文建; 张志锋; 徐阳
Original assignee: 丹佛斯微通道换热器（嘉兴）有限公司
Priority date: 2014-01-28
Filing date: 2015-01-28
Publication date: 2015-08-06
Also published as: EP3104110B1; EP3104110A1; US20160356560A1; CN103759474A; EP3104110A4; CN103759474B

Abstract

A board-type heat exchanger comprises multiple heat exchange boards (10) overlapped with each other. Each of the heat exchange boards (10) comprises a fluid inlet (1) and a fluid outlet (2) that are separately located in two opposite ends of the heat exchange board in the lengthwise direction. A partition portion is disposed on the upper surface and/or the lower surface of each of the heat exchange boards (10), so that fluid from the fluid inlet (1) is divided at the fluid inlet (1), then flows into independent fluid passage zones (3, 4) partitioned by the partition portion, gathers at the fluid outlet (2), and finally flows out of the fluid outlet (2).

Description

Plate heat exchanger

The present application claims priority to Chinese Patent Application No. 201410042349. filed on Jan.

Technical field

The invention relates to the fields of HVAC, automobile, refrigeration and transportation, and in particular to a plate heat exchanger.

Background technique

For heat exchangers (evaporators) with parallel channels, especially for plate heat exchangers and microchannel heat exchangers, the liquid-distribution of refrigerants is a worldwide technical problem. The refrigerant normally entering the heat exchanger is in the form of two phases, and it is difficult to achieve uniform distribution of the refrigerant due to the application conditions and the complexity of the two-phase flow. In many cases, excess liquid refrigerant will flow into some channels, while excessive gaseous refrigerant will flow into other channels, which greatly affects the overall performance of the evaporator.

However, since the heat exchange plates are so wide that such a large heat exchange plate is difficult to obtain a good fluid distribution, for example, along the longitudinal direction of the heat exchanger plates. Therefore, there is a real need to provide a novel plate heat exchanger that is capable of at least partially solving the above problems.

Summary of the invention

It is an object of the present invention to address at least one aspect of the above problems and deficiencies existing in the prior art.

According to an aspect of the invention, a plate heat exchanger is provided. The plate heat exchanger includes a plurality of heat exchange plates stacked on each other, each heat exchange plate including a fluid inlet and a fluid outlet respectively located at opposite ends thereof along a longitudinal direction thereof.

a barrier is disposed on the upper surface and/or the lower surface of each heat exchange plate such that fluid from the fluid inlet is split at the fluid inlet and then flows into mutually independent fluid passage regions separated by the barrier portion and Converging at the fluid outlet and eventually flowing out of the fluid outlet.

In one embodiment, the barrier comprises a barrier strip that diverts fluid at the fluid inlet and a lengthwise block that is coupled thereto.

Specifically, the lengthwise block is set to one of the following three ways:

Generally parallel to the longitudinal direction of the heat exchange plate;

Tilting with respect to the longitudinal direction of the heat exchange plate;

There is a curved or meandering shape in the longitudinal direction of the heat exchange plate.

In another embodiment, the barrier portion includes at least one barrier strip extending from the fluid inlet to the fluid outlet.

Specifically, the barrier strip is set in one of three ways:

Generally parallel to the longitudinal direction of the heat exchange plate;

Tilting with respect to the longitudinal direction of the heat exchange plate;

Specifically, the barrier strip is disposed at an inlet angle of the fluid at an angle ranging from -45 to 45 with respect to a direction perpendicular to a longitudinal direction of the heat exchange plate, wherein the barrier strip is linear or curved .

Specifically, the fluid inlet is on the upper side of the upper end and/or the lower end of the lower surface of the heat exchange plate, and the fluid outlet is on the upper side or the lower side of the right end of the surface of the heat exchange plate.

Specifically, the fluid inlet is provided with a fluid dispenser having an intermediate cavity for containing fluid from the fluid inlet and at least two penetrating fluid dispensers for directing fluid from the intermediate cavity. Guides.

In particular, the at least two guides comprise any one of a through hole, a conduit and a channel that penetrates the body of the fluid dispenser or any combination thereof.

In particular, the conduit includes tubes and/or capillaries that respectively introduce fluid into different fluid passage zones.

Specifically, the channel is integrally or separately formed on the heat exchange plate.

Specifically, the fluid dispenser includes an annular body that penetrates the annular body from the outside.

Specifically, the plate heat exchanger further includes an end plate disposed on an outer side surface of the heat exchange plate for fixing the heat exchange plate.

Specifically, the surface of the heat exchange plate is provided with a structural pattern for fluid distribution.

Specifically, the surface is provided with a plurality of pits or protrusions that are regularly arranged.

Specifically, a plurality of herringbone-arranged grooves and ridges are provided on the surface.

The main idea of the invention is mainly based on the following aspects:

1) separating a large heat exchanger plate into several sections or passage areas extending substantially in parallel;

2) Regarding the fluid distribution of the plate heat exchanger, the narrower the width of the heat exchanger plate is, the better the fluid distribution is;

3) The fluid can enter at one port of the plate heat exchanger and by means of the fluid fraction according to the invention The adapter is directed to the required area.

At least some aspects of the above aspects of the invention achieve the following technical effects:

1) A good fluid distribution is achieved without limiting or constraining the width of the heat exchanger plates;

2) The use of pit technology without loss of strength is more competitive for cost reduction;

3) A specially designed fluid dispenser according to the present invention can provide consistent and stable processes and performance.

DRAWINGS

These and/or other aspects and advantages of the present invention will become apparent and readily understood from

Figure 1 is a view showing an example of a heat exchange plate in a plate heat exchanger according to the present invention;

Figure 2 is a view showing another example of a heat exchange plate in a plate heat exchanger according to the present invention;

Figure 3 is a view of a heat exchanger plate adjacent to the heat exchange plates shown in Figure 1 or 2 in a plate heat exchanger according to the present invention;

Figure 4 is an enlarged plan view of the rectangular frame shown in Figure 1;

Figure 5 is a view showing another example of a heat exchange plate in a plate heat exchanger according to the present invention;

Figure 6 is a view showing another example of a heat exchange plate in a plate heat exchanger according to the present invention;

Figure 7 is a view showing another example of a heat exchange plate in a plate heat exchanger according to the present invention;

8a-8d are views of various examples of fluid dispensers used in heat exchanger plates in a plate heat exchanger according to the present invention;

Figures 9a-9b respectively show views of two examples of heat exchange plates using a fluid dispenser; and

Figure 10a shows a view of a portion of a heat exchange plate in accordance with the present invention, and Figure 10b is an enlarged view of a portion of Figure 10a.

detailed description

The technical solution of the present invention will be further specifically described below by way of embodiments and in conjunction with FIGS. 1-10b. In the description, the same or similar reference numerals indicate the same or similar parts. The description of the embodiments of the present invention with reference to the accompanying drawings is intended to illustrate the general inventive concept of the invention, and should not be construed as a limitation of the invention.

Referring to Figure 1, there is shown a heat exchange plate 10 of a plate heat exchanger according to an embodiment of the present invention. Front view. As is known to those skilled in the art, the plate heat exchanger includes a plurality of heat exchange plates 10 stacked one upon another, and end plates (not shown) disposed on the outer side faces of the plate heat exchangers for fixing The heat exchange plate 10. That is, a plurality of heat exchange plates 10 stacked together are assembled by two end plates, for example, by screw fastening, screwing or welding. Typically two adjacent heat exchange plates 10 are alternately stacked together to form a fluid passage or a single fluid passage region for fluid passage. Obviously, the above mounting method is only an example, and the heat exchange plate of the present invention can be fixed in any manner known in the art.

In view of the main improvement of the present invention in the heat exchanger plates in the plate heat exchanger, the structures such as the end plates and the fixing means will not be described in detail. Those skilled in the art can make settings according to the prior art as needed.

The heat exchange plate 10 includes a fluid inlet 1 and a fluid outlet 2 which are respectively located at opposite ends (e.g., the upper left and upper right corners of the drawing) along their longitudinal directions. In order to obtain a better fluid distribution, the upper surface (ie, the illustrated surface) of the heat exchange plate 10 of the present example is provided with a barrier portion that divides the surface of the heat exchange plate 10 into two separate fluid passage regions 3 and 4. The barrier comprises a barrier strip 8 that diverts fluid at the fluid inlet 1 and a lengthwise block 7 connected thereto. Thus, the fluid from the fluid inlet 1 (e.g., the refrigerant, as indicated by the illustrated arrows) is first split by the barrier strip 8 and then flows into the two fluid passage zones 3 and 4, respectively, and converges at the fluid outlet 2, and Eventually it flows out of the fluid outlet 2. It should be noted here that the fluid passage regions 3 and 4 are independent of each other, that is, after the fluid is branched through the barrier strip 8, the flows in the respective fluid passage regions 3 and 4 do not mix with each other, only near the fluid outlet 2 Only mix and eventually flow out of the fluid outlet 2.

It should be noted that the barrier strip 8 is not necessarily linear, and may be selected to be perpendicular to the vertical direction of the heat exchanger plate 10 (ie, the vertical direction of the drawing, which is perpendicular to the longitudinal direction of the heat exchanger plate 10). Within an angle range of 45° to 45°. To facilitate fluid distribution, the barrier strip 8 can be placed in a slightly inclined or curved form to the left as shown.

The fluid inlet 1 is disposed at an upper side (for example, an upper left corner) of the left end of the heat exchange plate 10, and the fluid outlet 2 is disposed at an upper side (for example, an upper right corner) of the right end of the heat exchange plate 10. Those skilled in the art will appreciate that

ports

5 and 6 are also provided on heat exchanger plate 10 for mating with adjacent heat exchange plates; however,

ports

5 and 6 are fluid on the illustrated upper surface of heat exchanger plate 10 The assignment does not work or is irrelevant, so it will not be described in detail below.

In order to obtain that the flow passages in the fluid passage regions 3 and 4 are independent of one another or that the fluid does not mix midway after being diverted from the fluid inlet 1, it is generally provided that the barrier strip 8 is sealingly connected to the longitudinal block 7.

As can be seen from Figure 1, the fluid is divided into two branches at the fluid inlet 1. The two branches are first tilted slightly downwards overall. One branch is then directed to the right through the fluid channel region 3; the other branch of the fluid is directed from the fluid inlet 1 to the lower left side (eg, through the region between the port 5 and the left edge of the heat exchanger plate 10) Thereafter, it is directed to the right to the fluid passage area 4. The two branches converge at the fluid outlet 2 and flow out of the fluid outlet 2.

Although the lengthwise block 7 is shown substantially parallel to the longitudinal direction of the heat exchange plate 10 (i.e., the left and right direction shown in FIG. 1) in FIG. 1, those skilled in the art can set it as opposed to the The longitudinal direction of the heat exchange plate 10 is inclined at a predetermined angle (for example, within an angular range of -45° to 45° with respect to a direction perpendicular to the longitudinal direction of the heat exchange plate, such as 30°), or The hot plate 10 has a curved or meandering shape in the longitudinal direction.

It can be understood that such a blocking portion can be disposed on the other surface of the heat exchange plate 10 (opposite to the upper surface, that is, the lower surface); the number of the blocking portions can be specifically set on the heat exchange plate 10 as needed. It is limited to the case of illustration; the above-described barrier portion may be formed according to other methods, and is not limited to the illustrated structure.

As shown in FIG. 2, the fluid inlet 1 is disposed at the upper left corner of the heat exchange plate 10, and the fluid outlet 2 is disposed at the lower end of the right end of the heat exchange plate 10 (for example, the lower right corner). Since the position setting of the fluid outlet 2 is different from that shown in Fig. 1, the flow is the same as that shown in Fig. 1 except that the fluid flow direction (as indicated by the arrow in Fig. 2) is different from that shown in Fig. 1. , will not be described in detail here.

In Figures 1 and 2, there is no direct sealing connection between the barrier strip 8 and the longitudinal block 7, but rather the fluid is blocked by means of the sealing edge of the port 5. Of course, if the port 5 is not provided or in other cases, the connection barrier strip 8 and the longitudinal block 7 can be directly sealed.

As shown in FIG. 3, another heat exchange plate 20 that is mated or adjacent to the heat exchange plate 10 described above is shown. It will be appreciated that in order to cooperate with the heat exchange plates 10, respective ports 25, 26 are provided at the four corners of the heat exchange plate 20, the ports 25, 26 being arranged such that fluid cannot flow therethrough. In order to guide a fluid (e.g., water) on the heat exchange plate 20, a fluid inlet 21 and a fluid outlet 22 are provided at the center of the left and right ends, respectively. As shown, fluid from the second fluid inlet 21 is directed directly through the surface of the heat exchange plate 20 to the second fluid outlet 22, on which no barriers as described above are disposed. Of course, those skilled in the art can provide similar barriers on the heat exchange plate 20 in accordance with the above disclosure as needed.

Referring to Figure 4, an enlarged view of a portion of the heat exchange plate 10 of Figure 1 is shown. As can be seen, most of the upper surface of the heat exchange plate 10 is provided with a pattern of pit structures as illustrated for aiding fluid dispensing. It can be understood that when one of the surfaces (for example, the upper surface) of the heat exchange plate 10 is provided with the above-described substantially hemispherical pit pattern structure, the other surface (for example, the lower surface) of the heat exchange plate 10 is correspondingly A protrusion structure corresponding to the substantially hemispherical pit described above is provided. The form of the above-described pit pattern structure and the pitch and size between adjacent pits may be arranged as needed. Of course, the above-described pits 11 and raised pattern structures can be replaced by grooves and ridges of a chevron pattern known in the art, if possible. Of course, the invention can also A heat exchanger plate applied to a dot wave pattern.

Fig. 5 shows another example of the heat exchanger plate of the present invention. It is apparent that the heat exchange plate 30 shown in FIG. 5 is different from the heat exchange plate 10 described above in that the heat exchanger plate 30 is separated from the fluid inlet 31 by using the barrier strips 37, 38 (ie, two barrier portions).

Fluid channel regions

331, 332, 333. The barrier strip 37 extends from the fluid inlet 31 at the upper left corner to the region near the fluid outlet 32 at the upper right corner. The other barrier strip 38 extends from the fluid inlet 31 to the left side of the port 35 at the middle of the left side and via the port 35' at the lower left corner, to the port 36 at the right center and to the fluid outlet 33 at the lower right corner. The area between. As indicated by the arrows in the figure, the fluid from the fluid inlet 31 is divided into three portions, respectively flowing in the three

fluid passage regions

331, 332, 333. Of course, it is also possible to arrange a plurality of barriers based on the same principle to divide the heat exchange plates 30 into four, five or even more fluid passage regions. As described above, the barrier strips 37, 38 may be disposed substantially parallel to the longitudinal direction of the heat exchange plate 30 (i.e., linear), inclined with respect to the longitudinal direction of the heat exchange plate 30, or The heat exchange plate 30 has a curved or meandering shape in the longitudinal direction. Further, the

fluid outlets

32, 33 may be provided in two or one as needed.

Fig. 6 shows another example of the heat exchange plate 40 of the present invention. The barrier strip 47 extends from the fluid inlet 41 at the upper left corner of the heat exchanger plate 40 to the region between the fluid outlet 42 in the upper right corner and the port 46 in the lower right corner. Thus, as indicated by the arrows in the figure, the fluid is shunted into two portions by the bent portion 471 of the barrier strip, respectively in the two

fluid passage regions

43 and 44 separated by the barrier strip 47 along the illustrated arrows. Flows and eventually converge from the fluid outlet 42. Similarly,

ports

45 and 46 that are mated to adjacent heat exchange plates are also provided.

Fig. 7 shows another example of the heat exchange plate 50 of the present invention. Two barrier strips 57 extend from the fluid inlet 51 at the upper left corner of the heat exchanger plate 50 to the region between the fluid outlet 52 in the upper right corner and the port 56 in the lower right corner, respectively, but the two barrier strips 57 are spaced apart Scheduled distance setting. Thus, as indicated by the arrows in the figure, the fluid is divided into three sections, respectively flowing in the formed three

fluid passage regions

53, 54, 59, and finally flowing out of the fluid outlet 52. Similarly,

ports

55 and 56 that are mated with adjacent heat exchange plates are also provided.

As noted above, the heat exchanger plates are configured to have at least two separate fluid passage zones in either a barrier strip or a lengthwise block to improve fluid dispensing.

In Figures 1-7, the surface of the heat exchanger plate is provided in the form of pits or protrusions, which will not be described in detail.

Although no fluid dispenser is provided on the heat exchanger plates shown in Figures 1-7 above, it is known that where better fluid dispensing is required or no fluid dispensing device is unable to direct fluid to the desired heat transfer region, Various forms of fluid dispensers can be employed as described below. That is, preferably, the above-described barrier portion and fluid dispenser are used in combination in the present invention.

As shown in Figures 8a-8d, one example of a fluid dispenser 60 in accordance with the present invention is shown. The fluid dispenser 60 has a body 61 and an intermediate cavity 62 located within the body 61 for containing fluid. In addition, the fluid dispenser 60 also has at least two

guides

63, 64 that penetrate the fluid distributor 60 to direct fluid from the intermediate cavity 62. As shown, the body 61 is generally annular or circular, but it can also be provided in a variety of possible shapes such as square, rectangular, elliptical, and the like. The guide portion may be provided in the form of a through hole 63 or a duct 64 that penetrates the main body 61 to the intermediate cavity 62 from the outside. The conduit 64 can be a tube or capillary for directing fluid into different fluid passage regions. Figure 8a shows a guide in the form of a through hole 63 and a duct 64. Figure 8b shows the guide in the form of a through hole 63 and three ducts 64. Figure 8c shows the guide in the form of a through hole 63 and five ducts 64. Figure 8d shows the guide in the form of three through holes 63. It will be appreciated that specific forms of the guides, such as through holes, conduits and channels, or any combination thereof, may be selected as desired.

Figures 9a and 9b show enlarged views of a portion of a heat exchange plate, respectively, showing different examples of guides. In Figure 9a, an example of directing fluid from fluid inlet 71 to a different fluid passage region through two guides, such as

conduits

72, 73, is shown. As can be seen from Figures 9a and 9b, both guides are arranged to extend generally downwardly or to the lower left to facilitate better dispensing of fluid.

In Fig. 9b, an example is shown in which fluid from fluid inlet 81 is directed to a different fluid passage region by two guides, such as

channels

82, 83, wherein

channels

82, 83 are integrally formed on the heat exchanger plate on. It will be appreciated that although only two guides are shown in Figures 9a and 9b, those skilled in the art will appreciate the situation in which a plurality of similar guides are provided.

Figures 10a and 10b show a partial and enlarged view, respectively, of a portion of a heat exchange plate in accordance with the present invention. In Fig. 10a, an example in which a fluid distributor of a through hole 63 and a guide portion of a duct 64 is used in the heat exchanger plate of the present invention is shown. The heat exchange plates are separated into two

fluid passage regions

105 and 106 by a barrier portion 107 as indicated by the arrows in the figure. As clearly seen in the enlarged view of Fig. 10b, the fluid directed through the through hole 63 (i.e., the fluid on the left side of the illustration) returns when it encounters the left side boundary of the blocking portion 107, and then flows upward until it flows to Fluid outlet. The fluid is directed through a long tube or capillary 64 to the fluid channel region 106 on the right side of the barrier 107 (ie, forming the fluid on the right side of the illustration), which returns upon encountering the right edge of the barrier 107, and then flows upward Until it flows to the fluid outlet. It should be noted that when the fluid encounters the boundary of the heat exchanger plate, it will return and flow to the fluid outlet. As shown in Fig. 10a, barrier strips 108 and 109 may also be provided near the bottom left and right sides of the heat exchange plates to further enhance the effect of fluid distribution. The barrier 107 includes an elongated block or barrier strip 104.

Although a plurality of structural features of the heat exchanger plate of the present invention are illustrated in the various embodiments described above, it should be understood A person skilled in the art can combine the various structural features in the different embodiments to form a new embodiment, which should be understood to be included in the scope of the present invention.

The above is only some embodiments of the present invention, and those skilled in the art will understand that the embodiments may be modified without departing from the spirit and spirit of the present general inventive concept. Their equivalents are defined.

Claims

A plate heat exchanger comprising a plurality of heat exchange plates stacked one on another, each heat exchange plate comprising a fluid inlet and a fluid outlet respectively located at opposite ends thereof along a longitudinal direction thereof,

It is characterized in that

a barrier is disposed on the upper surface and/or the lower surface of each heat exchange plate such that fluid from the fluid inlet is split at the fluid inlet and then flows into mutually independent fluid passage regions separated by the barrier portion and Converging at the fluid outlet and eventually flowing out of the fluid outlet.
A plate heat exchanger according to claim 1, wherein

The barrier includes a barrier strip that diverts fluid at the fluid inlet and a lengthwise block that is coupled thereto.
A plate heat exchanger according to claim 2, wherein

The lengthwise block is set in one of three ways:

Generally parallel to the longitudinal direction of the heat exchange plate;

Tilting with respect to the longitudinal direction of the heat exchange plate;

There is a curved or meandering shape in the longitudinal direction of the heat exchange plate.
A plate heat exchanger according to claim 1, wherein

The barrier includes at least one barrier strip extending from the fluid inlet to adjacent the fluid outlet.
A plate heat exchanger according to claim 4, wherein

The barrier strip is arranged in one of three ways:

Generally parallel to the longitudinal direction of the heat exchange plate;

Tilting with respect to the longitudinal direction of the heat exchange plate;

There is a curved or meandering shape in the longitudinal direction of the heat exchange plate.
A plate heat exchanger according to claim 2 or 4, wherein

The barrier strip is disposed at an inlet of the fluid at an angle ranging from -45 to 45 with respect to a direction perpendicular to the longitudinal direction of the heat exchange plate, wherein the barrier strip is linear or curved.
A plate heat exchanger according to any one of claims 1 to 6, wherein

The fluid inlet is on the upper side of the upper end and/or the lower end of the lower surface of the heat exchange plate, and the fluid outlet is on the upper or lower side of the right end of the surface of the heat exchange plate.
A plate heat exchanger according to any one of claims 1 to 7, wherein

A fluid dispenser is provided at the fluid inlet, the fluid dispenser having an intermediate cavity for containing fluid from the fluid inlet and at least two guides for penetrating the fluid from the intermediate cavity through the fluid dispenser .
A plate heat exchanger according to claim 8, wherein

The at least two guides include any one of a through hole, a conduit, and a channel that penetrates the body of the fluid dispenser, or any combination thereof.
A plate heat exchanger according to claim 9, wherein

The conduit includes tubes and/or capillaries that respectively introduce fluid into different fluid passage zones.
A plate heat exchanger according to claim 9, wherein

The channel is formed integrally or separately on the heat exchange plate.
A plate heat exchanger according to claim 9, wherein

The fluid dispenser includes an annular body that penetrates the annular body from the outside.
A plate heat exchanger according to any one of claims 1 to 12, characterized in that

Also included is an end plate disposed on an outer side of the heat exchange plate for securing the heat exchange plate.
A plate heat exchanger according to any one of claims 1 to 13, wherein

A structural pattern for fluid distribution is disposed on the surface of the heat exchange plate.
A plate heat exchanger according to claim 14, wherein

A plurality of pits or protrusions regularly arranged are provided on the surface.
A plate heat exchanger according to claim 14, wherein

A plurality of chevron-arranged grooves and ridges are disposed on the surface.