WO2016155367A1 - Heat exchanger and multi-split system having same - Google Patents

Abstract

Provided are a heat exchanger (100) and a multi-split system having the same. The heat exchanger (100) comprises a branch pipe (1) and a collecting pipe (2). The branch pipe (1) comprises a body (11), an inlet (12), and multiple flow separation holes. The inlet (12) is formed in the bottom of the body (11). The multiple flow separation holes are distributed in the side wall of the body (11) in the length direction of the body (11). In the direction from the bottom to the top, the body (11) comprises multiple segments of pipe bodies. In every two adjacent segments of pipe bodies, the flow area of a downstream pipe body is smaller than the flow area of an upstream pipe body, the height of each segment of pipe body is not greater than 0.5 meters, and the number N of the pipe bodies is greater than or equal to 2 and less than or equal to 3. The collecting pipe (2) and the branch pipe (1) are communicated by means of multiple heat exchange pipes, the multiple heat exchange pipes are distributed at intervals in the vertical direction, and the collecting pipe (2) has a refrigerant outlet (21).

Description

Heat exchanger and multi-line system with same Technical field

The present invention relates to the field of heat exchanger equipment, and more particularly to a heat exchanger and a multi-connection system having the heat exchanger.

Background technique

The multi-connection system in the related art is composed of an outdoor unit, an indoor unit, and a refrigerant flow between indoor and outdoor, and is divided into three types according to the number of refrigerant pipes between the outdoor unit and the refrigerant flow direction switching device (that is, three refrigerant pipes are used). And two controls (ie, two refrigerant pipes), of which the two control outdoor units have relatively complicated refrigerant systems, but they are concerned because of relatively simple construction and low cost.

For the two-control multi-line system, the outdoor unit heat exchanger must be designed such that the refrigerant flow direction is fixed, that is, the refrigerant flow direction is independent of cooling or heating. In order to reduce the refrigerant flow resistance during outdoor unit cooling, the flute tube is usually used instead of the conventional heat pump. Capillary design, which tends to cause two-phase refrigerant bias flow when the outdoor mechanism is hot, resulting in low system heating performance.

Summary of the invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a heat exchanger that is capable of better dispensing two-phase refrigerant without splitting the capillary.

The present invention also proposes a multi-connection system having the above heat exchanger.

A heat exchanger according to an embodiment of the present invention includes: a shunt tube including a body, an inlet, and a plurality of split ports, the inlet being disposed at a bottom of the body, the plurality of split ports being at the body The lengthwise direction is distributed on the side wall of the body, and in the direction from bottom to top, the body comprises a plurality of sections of tubes, and the flow area of the tubes located downstream of each of the adjacent sections of the tubes a flow area smaller than the pipe body located upstream, the height of each pipe body is not more than 0.5 m, the number N of the pipe bodies is 2 ≤ N ≤ 3; the header, the header and the shunt The tubes are connected by a plurality of heat exchange tubes, and the plurality of heat exchange tubes are spaced apart in the up and down direction, and the header tubes have an outlet for discharging the refrigerant.

According to the heat exchanger of the embodiment of the invention, it is possible to better distribute the two-phase refrigerant without the split capillary.

Specifically, the body is configured such that the flow rate of the liquid refrigerant flowing through the variable diameter of each adjacent two-stage pipe body is substantially equal to the flow rate of the liquid refrigerant of the inlet.

Further, the flow rate of the liquid refrigerant at the variable diameter of each adjacent two-stage pipe body and the flow rate of the liquid refrigerant of the inlet are both in the range of 0.4 to 0.6 m/s.

Specifically, the header is formed as a straight tube.

Specifically, the heat exchange tube is a flat tube.

Furthermore, the present invention also proposes a multi-line system comprising the heat exchanger described above.

DRAWINGS

1 is a schematic view of a heat exchanger according to an embodiment of the present invention;

2 is a schematic view of a heat exchanger in accordance with another embodiment of the present invention.

Reference mark:

Heat exchanger 100;

a shunt tube 1; a body 11; a first tube body 111; a second tube body 112; a third tube body 113;

Entrance 12;

Collector 2; outlet 21.

detailed description

Embodiments of the invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. Or in one piece; it may be a mechanical connection, or it may be an electrical connection or a communication with each other; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship between two elements. Unless otherwise expressly defined. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

A heat exchanger 100 in accordance with an embodiment of the present invention will now be described with reference to Figures 1-2, wherein the heat exchanger 100 can be utilized in a refrigeration unit such as a single chiller, a chiller or a multi-line system.

As shown in FIG. 1 and FIG. 2, a heat exchanger 100 according to an embodiment of the present invention includes a shunt tube 1 and a heat exchange tube (not shown in the figure). Shown) and header 2.

Specifically, as shown in FIG. 1, the shunt tube 1 includes a body 11, an inlet 12, and a plurality of split ports (not shown), the inlet 12 is disposed at the bottom of the body 11, and the plurality of split ports are at the length of the body 11. The upper portion is distributed on the side wall of the body 11.

The collecting tube 2 and the shunt tube 1 are connected by a plurality of heat exchange tubes, and the plurality of heat exchange tubes are spaced apart in the up and down direction, and the collecting tube 2 has an outlet 21 for discharging the refrigerant, as shown in FIGS. 1 and 2, The refrigerant enters the heat exchange tube from the branch pipe 1 through a plurality of split ports, and the refrigerant exotherms or absorbs heat in the heat exchange tubes, and the refrigerant that has passed through the heat release or heat absorption finally enters the header tube 2 and enters the other flow paths through the outlet 21.

That is to say, the refrigerant flows from the bottom inlet 12 of the body 11 from the bottom to the top through each of the split ports, and the refrigerant passing through each of the split ports passes through the heat transfer tubes and enters the header 2.

In the direction from bottom to top, the body 11 includes a plurality of sections of tubes, and the flow area of the tubes located downstream of each adjacent two sections is smaller than the flow area of the tubes located upstream, and the number N of the tubes is 2 ≤ N ≤ 3, that is, the number of tubes is two or three.

Referring to FIG. 1, for example, in one embodiment of the present invention, the body 11 includes a first tube body 111 and a second tube body 112, the inlet 12 is disposed on the first tube body 111, and the second tube body 112 is cross-sectioned. The area is smaller than the cross-sectional area of the first pipe body 111, in other words, the flow area of the second pipe body 112 is smaller than the flow area of the first pipe body 111, so that the refrigerant first enters the first pipe body 111 from the inlet 12 at a certain speed. The refrigerant in the first pipe body 111 flows from the bottom to the top. When passing through the branching port, a part of the refrigerant passes through the heat transfer pipe through the branching port and enters the header pipe 2, and the liquid refrigerant in the first pipe body 111 flows upward. Less and less, the speed of the refrigerant also decreases. Then, the refrigerant enters the second pipe body 112. Since the flow area of the second pipe body 112 is smaller than the flow area of the first pipe body 111, the refrigerant tends to accelerate. Therefore, the speed of the refrigerant in the second pipe body 112 is not significantly reduced, thereby ensuring that sufficient refrigerant in the second pipe body 112 can flow into the heat exchange pipe through the branching port, thereby effectively improving the heat exchanger 100. Work efficiency.

Of course, the present invention is not limited thereto. As shown in FIG. 2, in another embodiment of the present invention, the body 11 may also include a first tube body 111, a second tube body 112, and a third tube body 113. In the first pipe body 111, the flow area of the second pipe body 112 is smaller than the flow area of the first pipe body 111, and the flow area of the third pipe body 113 is smaller than the flow area of the second pipe body 112. The same principle is adopted. The length and the flow area of the first pipe body 111, the second pipe body 112 and the third pipe body 113 are arranged, so that the refrigerant can flow through the split port of the top of the body 11, so that the corresponding corresponding to the third pipe body 113 can be effectively improved. The utilization rate of the heat exchange tubes, thereby effectively improving the working efficiency of the heat exchanger 100.

The height of each of the tubes is not more than 0.5 m, so that the refrigerant can be further circulated to reach the top portion of the body 11, thereby effectively improving the working efficiency of the upper portion of the heat exchanger 100.

According to the heat exchanger 100 of the embodiment of the present invention, by having the body 11 having a plurality of tubes, the flow area of the tubes located downstream of each adjacent two stages is smaller than the flow area of the tubes located upstream, thereby Increasing the flow rate of the liquid refrigerant when the refrigerant flows through the variable diameter of each two-stage pipe body, and the purpose of accelerating on the way to ensure the upper portion of the shunt pipe 1 The domain is also capable of obtaining sufficient liquid refrigerant to ensure efficient use of the heat exchanger 100, so that the heat exchanger 100 can better distribute the two-phase refrigerant without the split capillary.

Specifically, the body 11 is configured such that the flow rate of the liquid refrigerant flowing through the variable diameter of each adjacent two-stage pipe body is substantially equal to the flow rate of the liquid refrigerant of the inlet 12, that is, the pipe body of each adjacent two stages The difference in flow area is designed to increase the flow rate of the liquid refrigerant flowing through the variable path to a flow rate substantially equal to the liquid refrigerant at the inlet. Therefore, the effect of accelerating the liquid refrigerant on the way is further ensured, and the speed of the liquid refrigerant entering from the upstream pipe body to the downstream pipe body is not significantly reduced, so that the liquid refrigerant can enter the heat exchange pipe in the upper region of the heat exchanger 100. The working efficiency of the heat exchanger 100 is further effectively improved.

Specifically, the flow rate of the liquid refrigerant at the variable diameter of each adjacent two-stage pipe body and the flow rate of the liquid refrigerant of the inlet 12 are both in the range of 0.4 to 0.6 m/s, so that the flow rate of the liquid refrigerant is controlled to be constant. Within the scope of the invention, the liquid refrigerant can be efficiently passed through the split port into the heat exchange tube, thereby improving the working efficiency of the entire heat exchanger 100.

Referring to the example shown in FIGS. 1 and 2, the header 2 is formed as a straight tube. The refrigerant flowing out of the heat exchange tube enters the header 2, and the refrigerant flows from the top to the bottom in the header 2. By constructing the header 2 as a straight tube, the circulation of the refrigerant can be facilitated, thereby improving the heat exchanger 100. Work efficiency.

In an example of the present invention, the heat exchange tube is a flat tube, so that the heat exchange area between the refrigerant and the air can be increased, so that the refrigerant absorbs heat or exotherms better, thereby effectively improving the working efficiency of the heat exchanger 100. . At the same time, fins may be arranged between each adjacent two heat exchange tubes in the up and down direction to increase the heat exchange area between the heat exchanger 100 and the air, and further improve the heat exchange effect of the heat exchanger 100.

Furthermore, the present invention also proposes a multi-line system comprising the heat exchanger 100 described above.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (6)

A heat exchanger, comprising: a shunt tube comprising a body, an inlet and a plurality of split ports, the inlet being disposed at a bottom of the body, the plurality of split ports being distributed on a sidewall of the body in a length direction of the body Above, in the direction from bottom to top, the body comprises a plurality of sections of tubes, and the flow area of the tubes located downstream of each of the adjacent sections of the tubes is smaller than the flow area of the tubes located upstream, each section The height of the pipe body is not more than 0.5 m, and the number N of the pipe body is 2 ≤ N ≤ 3; a collecting pipe, wherein the collecting pipe and the branch pipe are connected by a plurality of heat exchange pipes, and the plurality of heat exchange pipes are spaced apart in an up-and-down direction, and the collecting pipe has an outlet for discharging the refrigerant. The heat exchanger according to claim 1, wherein said body is configured such that a flow rate of liquid refrigerant flowing through a variable diameter of each adjacent two-stage pipe body is substantially equal to a flow rate of said liquid refrigerant of said inlet . The heat exchanger according to claim 2, wherein the flow rate of the liquid refrigerant at the variable diameter of each adjacent two-stage pipe body and the flow rate of the liquid refrigerant at the inlet are in the range of 0.4 to 0.6 m. /s. The heat exchanger according to any one of claims 1 to 3, wherein the header is formed as a straight tube. The heat exchanger according to any one of claims 1 to 4, wherein the heat exchange tube is a flat tube. A multi-line system characterized by comprising a heat exchanger according to any one of claims 1-5.

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