WO2015120804A1

WO2015120804A1 - Plate heat exchanger

Info

Publication number: WO2015120804A1
Application number: PCT/CN2015/072880
Authority: WO
Inventors: 魏文建; 徐阳; 张志锋; 向量
Original assignee: 丹佛斯微通道换热器（嘉兴）有限公司
Priority date: 2014-02-12
Filing date: 2015-02-12
Publication date: 2015-08-20
Also published as: CN103776284A; CN103776284B

Abstract

A plate heat exchanger and a method for mounting in the plate heat exchanger fluid inlets (1 and 21) in communication with pipes (3 and 23) and fluid channels (5 and 25) on heat exchanger plates (10 and 20). The plate heat exchanger comprises the multiple heat exchanger plates (10 and 20) that are stacked together. The heat exchanger plates (10 and 20) each comprise, provided thereon, the fluid inlets (1 and 21) and fluid outlets (2 and 22). The fluid inlets (1 and 21) are in communication with the fluid channels (5 and 25) on the heat exchanger plates (10 and 20) only via the pipes (3 and 23).

Description

Plate heat exchanger

The present application claims priority to Chinese Patent Application No. 20141004842, filed on Feb. 12, 2014, which is hereby incorporated by reference.

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, excessive liquid refrigerant will flow into some channels, while too much gaseous refrigerant will flow into other channels, and there will be problems with uneven fluid distribution in a single channel, which greatly affects evaporation. Overall performance of the device.

Refrigerant distribution schemes for existing products are based on dispenser technology. Common means are: ring distributor, embedded distributor, ejector dispenser, and the like. The ring distributor, although it works well under certain conditions, does not perform well under low and partial loads. Moreover, it also has disadvantages such as high cost. Embedded distributors operate under restricted conditions and also have a high cost disadvantage. The ejector distributor can also work well under certain conditions, but since the ejector channel is pressed on the heat exchanger plate in one molding. Although the cost is lower, the cross section of the ejector channel is not constant enough, and the consistency is not good enough during brazing and brazing due to problems such as depth tolerance and copper deposition. This leads to unstable performance.

In view of this, it is indeed desirable 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 described above, there is provided a plate heat exchanger capable of at least overcoming the deficiencies of the ejector distributor.

In one aspect of the invention, a plate heat exchanger is provided. The plate heat exchanger includes a plurality of heat exchange plates stacked one on another, each heat exchange plate including a fluid inlet and a fluid outlet disposed thereon, the flow The body inlet and the fluid passage on the heat exchanger plate are only in communication through the tube.

Specifically, the inner diameter of the tube is in the range of 0.6 to 3.0 mm.

Specifically, the dispenser is fixed to the heat exchanger plate by any of the following mounting methods:

(1) placing the tube into a groove formed by pressing on the heat exchange plate, and fixedly connecting the tube and the groove;

(2) fixing the tube on the heat exchange plate by pressing the sheet;

(3) Fix the tube to the heat exchanger plate by bonding or mounting accessories.

Specifically, the fluid inlet is provided with a groove formed by pressing on a heat exchange plate, the tube being received in the groove, and being fixedly connected to the groove by welding.

Specifically, the gap between the tube and the groove is blocked by brazing.

Specifically, a suction port is provided on the groove at the outlet of the tube.

Specifically, a flat expansion zone is provided between the end of the groove of the heat exchanger plate adjacent to the outlet of the tube and the heat exchange passage on the heat exchange plate for fluid distribution.

Specifically, at the inlet of the tube of the heat exchange plate, a recess is provided to assist in directing fluid into the tube.

Specifically, the outlet of the tube and a portion of the groove in the vicinity thereof are generally flared.

In particular, the tube is arranged to be straight, curved or meandered.

Specifically, each heat exchange plate is a point wave heat exchange plate or a herringbone heat exchange plate.

Specifically, the fluid inlet and the fluid outlet are respectively located at opposite ends along their longitudinal direction.

In another aspect of the invention, a method of installing a tube in the plate heat exchanger is provided, the dispenser being secured to the heat exchange plate by any of the following mounting means:

(2) fixing the tube on the heat exchange plate by pressing the sheet;

In addition, a suction port is provided at the outlet of the tube.

The main idea of the invention is to connect the fluid inlet on the heat exchanger plate and the heat exchange channel on the heat exchanger plate only by means of a tube or a small tube-shaped distributor, which is used to replace the distribution channel or the ejector in the ejector aisle. Therefore, the problem of channel depth and copper deposition will no longer affect its cross section, and performance will become stable and consistent.

In addition, the scheme of using the tube is more cost competitive than the scheme of pressing the ejector channel. Moreover, the tube can be combined with other structural designs of the heat exchanger plates to enhance the efficiency of the injection and improve fluid turbulence and oil return at the bottom of the plate heat exchanger.

DRAWINGS

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

Figure 1 shows a view of a portion of a heat exchange plate in accordance with one embodiment of the present invention;

Figure 2 shows a view of a portion of a heat exchange plate in accordance with another embodiment of the present invention;

Figures 3a and 3b show schematic views of the structural arrangement of the fluid inlets of the small tube and the heat exchanger plate, respectively;

Figure 4 is a schematic view showing the flow direction of a fluid in a tube of a heat exchanger plate according to the present invention;

Figure 5 shows a view of a heat exchange plate in accordance with a further embodiment of the present invention.

detailed description

The technical solutions of the present invention will be further specifically described below by way of embodiments and with reference to the accompanying drawings. 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 view of a fluid inlet portion of a heat exchange plate 10 in a plate heat exchanger in accordance with one embodiment of the present invention. 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. In the case where a structural pattern of pits or protrusions is usually provided on the heat exchange plate 10, the adjacent two heat exchange plates 10 are alternately stacked mirror-symmetrically to form a heat exchange passage for fluid passage or change Hot aisle area. 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.

As shown in FIG. 1, the heat exchange plate 10 includes a fluid inlet 1 and a fluid outlet (not shown) disposed oppositely along the longitudinal direction of the heat exchanger plates. It will be appreciated that for heat exchange with another fluid, the heat exchanger plate 10 is also provided with an inlet and an outlet 2 for another fluid. In order to prevent mixing of the two different fluids, a barrier 31 such as a weld, a projection or a recess is provided at the periphery of the outlet or inlet 2. In view of the fact that the structural arrangement of the inlet, the outlet, the fluid passage on the heat exchanger plate, and the like for the other fluid on the surface of the other heat exchange plate can be similar to the surface shown in FIG. 1, it will not be described in detail herein.

As shown, a large number of dimples 8 are arranged at intervals on the surface of the heat exchange plate 10 except for the fluid inlet 1 and the fluid outlet. In order to achieve fluid distribution, the dimples 8 can be predetermined Pattern arrangement, such as rectangular, elliptical, circular, and the like. It will be appreciated that the recesses 8 are provided on the surface 9 of the heat exchange plate 10 shown in Fig. 1, so that correspondingly a large number of projections are provided on the other surface of the heat exchange 10 opposite the surface 9.

In the present example, the fluid passage 5 on the heat exchange plate 10 (formed when the adjacent two heat exchange plates 10 are assembled together) and the fluid inlet 1 are connected only by the distributor 3 in the form of a tube or a small tube. The diameter of the tube is preferably in the range of 0.6 to 3.0 mm.

Since a large number of dimples 8 are provided on the surface 9 of the heat exchange plate 10, a large number of fluid passages 5 are formed on the surface 9. It should be noted that although the present invention has been described in detail by taking a point wave heat exchanger plate including a large number of pits or protrusions, the present invention can also be applied to a herringbone heat exchanger plate including a large number of grooves and ridges. .

The dispenser is fixed to the heat exchanger plate by any of the following mounting methods:

(1) placing the tube into a groove formed by pressing on the heat exchange plate, and fixedly connecting (for example, welding) the tube and the groove;

(2) fixing the tube on the heat exchange plate by pressing the sheet;

Specifically for the welding method (1) described above, in order to fix the tube 3, a groove 4 is provided at the fluid inlet 1, which groove 4 is formed on the surface 9 by pressing. Typically, the tube 3 is placed or received in the recess 4 and is fixedly connected to the recess 4 by welding. Specifically, the gap or gap between the tube 3 and the groove 4 is blocked by brazing.

Of course, for the sake of simplicity, in some specific cases, the tube 3 can be welded directly to the surface 9 without the groove 4.

As seen in Fig. 1, a suction port 6 is provided in the recess 4 at the outlet of the small tube 3. In addition, in order to assist or facilitate the fluid distribution, a flat expansion zone is provided between the outlet end of the groove 4 near the small tube 3 and the heat exchange passage 5 (ie, there is no structural feature or only the heat exchanger plate in the expansion zone). The flat surface of 10) facilitates a more uniform flow within the single fluid passage of heat exchange plate 10. That is, the portion of the groove 4 at the outlet of the small tube 3 together with the outlet of the small tube 3 constitutes a generally flared structure.

Further, in order to facilitate the flow of fluid from the fluid inlet 1 into the small tube 3, a recess (not shown) may be provided at the inlet of the small tube 3.

In Fig. 1, the small tube 3 is provided in a generally hook shape, i.e., has a substantially annular portion and a flat portion connected thereto. Of course, the small tube 3 can also be provided in various forms as needed, such as curved or meandered, to achieve a better fit to the shape of the groove 4 and to achieve better suction and ejection efficiency.

A heat exchange plate 10 having a generally curved small tube 3 is shown in Fig. 2, and other structural arrangements are only shown in Fig. 1. The illustrations are generally similar and will not be described in detail herein.

It can be seen from the above description that the small tube 3 can also be fixed on the heat exchange plate 10 by the above-mentioned mounting method (2) or (3), for example, by bonding it to the heat exchange plate by an adhesive, and pressing it by pressing. It is fixed to the heat exchange plate 10 and fixed to the heat exchange plate 10 by mounting accessories or fittings.

Referring to Figures 3a and 3b, a schematic view of the structure of the small tube 3 connected to the fluid inlet 1 is shown, respectively. They differ in the shape of the small tube 3, which in Figure 3a is generally straight tubular and the small tube 3 in Figure 3b is generally curved. However, in Figs. 3a and 3b, the inlet of the small tube 3 is connected to the fluid inlet 1, and the outlet of the small tube 3 forms a substantially flared shape with a portion of the recess 4, and a suction port 6 is provided in the recess 4 near the outlet of the small tube 3.

As apparent from the above, for example, the fluid of the two-phase refrigerant can flow into the heat exchange passage 5 flowing through the small pipe 3 to the heat exchanger plate 10. During this flow, the pressure is lowered due to the provision of the small tubes 3, and the two-phase refrigerant is throttled. After this, the velocity of the fluid at the outlet of the small tube 3 is very high, while the port area at the outlet of the small tube 3 is under negative pressure. Thus, a fluid such as a liquid or oil is sucked through the suction port 6 and injected into the main heat exchange passage in the heat exchange passage 5. That is, with such an arrangement, fluid turbulence and oil return at the bottom of the heat exchange plate can be enhanced, as indicated by the arrows in FIG.

Thus, the present invention also provides a method of installing the above-described tube in the plate heat exchanger of the present invention. The specific steps are as follows: the small tube 3 is placed in the groove 4 formed by pressing on the heat exchange plate 10; the welded tube 3 and the groove 4; and the suction port 6 is provided in the groove 4 at the outlet of the tube 3. It can be seen that as long as the installation scheme for connecting the suction port 1 and the heat exchange passage 5 only through the pipe 3 can be ensured, it is applicable to the present invention, and is not limited to the above-described mounting scheme, such as the above-described mounting method (2) or (3). For example, the small tube or tube 3 can pass from one side of the heat exchange plate 10 to the other side. The described mounting method can reduce the need for gaskets and thus facilitate manufacturing assembly.

Referring to Figure 5, a heat exchange plate 20 having a herringbone or fishbone pattern is shown. It is substantially the same as the point-wave type heat exchange plate 10 shown in Fig. 1, except that the heat exchange plate 20 includes a plurality of grooves 28 and ridges 29 which are alternately and spacedly arranged in a predetermined pattern. The same is that the heat exchange plate 20 also includes an inlet 21 and an outlet 22. A distributor 23 in the form of a tube is disposed in the recess 24, and a recess 24 is provided at the outlet end of the recess 24 near the tube 23. A flat expansion zone 27 is provided between the outlet end of the groove 24 adjacent to the small tube 23 and the heat exchange passage 25.

The use of tubules of the present invention is more competitive with respect to the circular and embedded dispensers of the prior art, for example, at a lower cost in the case of similar process complexity.

Compared to the ejector dispensing scheme, the protocol using the tubules of the present invention achieves the same function, but with a more stable process and ensures consistent performance. In addition, the use of small tubes can reduce the depth tolerances and challenges of the grooves and is more suitable for manufacturing.

In each of the above examples of the invention, at least one of them achieves the following technical effects:

1) On the refrigerant side of the plate heat exchanger, the fluid inlet and the heat exchange passage on the heat exchanger plate are connected only by the pipe according to the invention.

2) The tube is used as a fluid dispenser for fluid distribution between a plurality of heat exchange channels of the heat exchange plates to improve the fluid distribution performance.

3) The tube is wrapped in the recess and combined with other geometric configurations designed on the heat exchanger plate for ejector. It will be appreciated that the tube may be combined with a design (e.g., a projection or depression) designed on the heat exchanger plate to improve fluid turbulence at the bottom of the heat exchanger plate and to improve oil return to the system, such as refrigerant.

4) The tube is used to replace an existing dispenser (such as a ring distributor, an embedded dispenser, etc.) to reduce production costs.

5) The tube improves process stability and consistency of performance.

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 including a fluid inlet and a fluid outlet disposed thereon

It is characterized in that

The fluid inlet and the fluid passage on the heat exchanger plate are only in communication through the tube.
A plate heat exchanger according to claim 1, wherein

The inner diameter of the tube is in the range of 0.6-3.0 mm.
A plate heat exchanger according to claim 1 or 2, wherein

The dispenser is fixed to the heat exchanger plate by any of the following mounting methods:

(1) placing the tube into a groove formed by pressing on the heat exchange plate, and fixedly connecting the tube and the groove;

(2) fixing the tube on the heat exchange plate by pressing the sheet;

(3) Fix the tube to the heat exchanger plate by bonding or mounting accessories.
A plate heat exchanger according to claim 3, wherein

The fluid inlet is provided with a groove formed by pressing on a heat exchange plate, the tube being received in the groove and being fixedly connected to the groove by welding.
A plate heat exchanger according to claim 4, wherein

The gap between the tube and the groove is blocked by brazing.
A plate heat exchanger according to claim 5, wherein

Also included is a suction port disposed on the groove at the outlet of the tube.
A plate heat exchanger according to claim 6, wherein

A flat expansion zone is provided between the end of the groove of the heat exchanger plate adjacent the tube and the heat exchange passage on the heat exchange plate for fluid distribution.
A plate heat exchanger according to claim 7, wherein

At the inlet of the tube of the heat exchanger plate, a recess is provided to assist in directing fluid flow into the tube.
A plate heat exchanger according to any one of claims 3-8, wherein

The outlet of the tube and a portion of the groove adjacent thereto are generally flared.
A plate heat exchanger according to any one of claims 1 to 9, wherein

The tube is arranged to be straight, curved or meandered.
A plate heat exchanger according to any one of claims 1 to 10, characterized in that

Each heat exchange plate is a point wave heat exchange plate or a herringbone heat exchange plate.
A plate heat exchanger according to any one of claims 1 to 11, wherein

The fluid inlet and the fluid outlet are respectively located at opposite ends along their longitudinal direction.
A method of installing a pipe in a plate heat exchanger according to claim 1, wherein

The dispenser is fixed to the heat exchanger plate by any of the following mounting methods:

(1) placing the tube into a groove formed by pressing on the heat exchange plate, and fixedly connecting the tube and the groove;

(2) fixing the tube on the heat exchange plate by pressing the sheet;

(3) Fix the tube to the heat exchanger plate by bonding or mounting accessories.
The method of claim 13 wherein:

A suction port is provided at the outlet of the tube.