Heat exchangers and air conditioning equipment

Abstract

The present invention discloses a heat exchanger and air conditioning equipment, including a heat exchange cavity and a heat exchange tube arranged in the cavity, wherein a main gas pipeline in the up-down direction is arranged in the heat exchange cavity, the main gas pipeline is connected to the air inlet of the heat exchange cavity, and several branch gas pipelines are connected to the main gas pipeline, and the branch gas pipeline divides the heat exchange cavity into several sub-heat exchange areas, and the other end of the branch gas pipeline away from the main gas pipeline is arranged downwardly and tilted, and the lower side wall of the branch gas pipeline is provided with an air outlet. By arranging a solid air guide pipeline in the heat exchange cavity of the heat exchanger, the gas can be evenly distributed to various parts of the heat exchange cavity through the air outlet opened thereon, and the gas equalization effect is better.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, in particular to a heat exchanger and air conditioning equipment. Background Art

[0002] Refrigeration equipment, especially commercial chillers, are mainly composed of compressors, heat exchangers, and throttling devices. The heat exchangers mainly include evaporators and condensers. The condenser is responsible for cooling and condensing the gaseous refrigerant into liquid refrigerant.

[0003] The chiller is generally a shell and tube condenser. The heat exchange principle of the existing shell and tube condenser is: the superheated refrigerant vapor enters the condenser from the top of the shell, and exchanges heat with the liquid water with a lower temperature in the heat exchange tube of the condensation area, thereby undergoing a phase change and being cooled into liquid refrigerant. However, there are two major problems in this process:

[0004] First, the number of inlet pipes in conventional shell-and-tube condensers is too small and is basically located at the top of the shell, resulting in a large number of dead zones, and the refrigerant cannot be evenly distributed at the heat exchange tubes at different positions, resulting in low heat exchange efficiency and other problems;

[0005] Secondly, the superheated refrigerant steam condenses when it encounters cold outside the tube. When the condensate accumulates to a certain thickness, it will fall off. The condensate that falls off from the upper tube row drips onto the lower tube row, causing the area wrapped by the condensate to be unable to exchange heat with the refrigerant steam. In severe cases, it may even form a "liquid bridge", blocking the refrigerant steam channel and affecting the heat exchange efficiency (tube bundle effect).

[0006] The invention patent with application number CN201310740172.8 discloses a shell-and-tube condenser, which uses a plurality of liquid guide plates arranged in the shell tube to divide the shell into a plurality of chambers, so that the heat exchange tubes are arranged in the plurality of chambers, and the chambers are spaced apart to form a gas flow channel for allowing the refrigerant gas to flow to the plurality of chambers. Although the gas flow channel between the chambers improves the uniformity of the refrigerant to a certain extent, the uniformity is poor due to the relatively open channel, so that the heat exchange tubes away from the air inlet or the middle main air channel bear a higher heat exchange temperature, while the heat exchange utilization rate of the heat exchange tubes away from the air inlet or the middle main air channel is low, so there are a large number of flow dead zones. In addition, in the channel below each chamber, the gas is heat exchanged from bottom to top, but the heat exchange tubes below each chamber accumulate more liquid, that is, the liquid film is thicker, which is not conducive to heat exchange.

[0007] Therefore, how to improve the heat transfer uniformity of the gas in the heat exchanger has become a technical problem that needs to be solved urgently in the industry. Summary of the invention

[0008] In order to solve the problem of heat exchange uniformity of gas in the heat exchanger, the present invention proposes to set an air guide pipe in the heat exchanger to divide the heat exchange cavity into several sub-heat exchange areas, so that the gas is evenly dispersed to various parts of the heat exchange cavity through the through holes set on the air guide pipe, thereby improving the heat exchange uniformity of the gas in the heat exchanger.

[0009] The technical solution adopted by the present invention is a heat exchanger, including a heat exchange chamber, and a heat exchange tube arranged in the chamber, wherein the heat exchange chamber is provided with a main air duct in the up and down directions, the main air duct is connected to the air inlet of the heat exchange chamber, the main air duct is connected to a plurality of branch air ducts, the branch air ducts divide the heat exchange chamber into a plurality of sub-heat exchange areas, the other end of the branch air duct away from the main air duct is arranged to be inclined downward, and the lower side wall of the branch air duct is provided with an air outlet.

[0010] In certain embodiments, a downward baffle is provided at the end of the bronchial duct, one end of the baffle is connected to the bronchial duct, and the other end of the baffle is opposite to the bronchial duct below it to form a liquid outlet.

[0011] In some embodiments, it also includes a top branch pipe located at the top of the main air pipe, and the upper and lower side walls of the top branch pipe are both provided with air outlet holes, and a heat exchange tube is provided between the top of the top branch pipe and the heat exchange cavity.

[0012] In certain embodiments, the bronchial ducts are symmetrically arranged on both sides of the main gas duct, and drainage ports are arranged on the cavity bodies of the heat exchange cavities below the bronchial ducts on both sides.

[0013] In certain embodiments, a subcooling heat exchange tube is disposed along the inner wall of the heat exchange cavity above the liquid discharge port.

[0014] In some embodiments, the number of the liquid drain ports is two and the number of the liquid drain ports is symmetrically arranged with respect to the main gas conduit.

[0015] In certain embodiments, a flow guiding slope is provided between the main gas conduit and the two liquid drain ports.

[0016] In certain embodiments, the air inlet of the heat exchange chamber is located below the guide slope.

[0017] In certain embodiments, an oil-gas separator is provided at the air inlet of the heat exchange chamber.

[0018] Air conditioning equipment includes the above-mentioned heat exchanger.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The present invention provides a solid gas-conducting duct in the heat exchange cavity of the heat exchanger, so that the gas can be evenly distributed to various parts of the heat exchange cavity through the gas outlets opened thereon, and the gas uniformity effect is better.

[0021] 2. The present invention divides the heat exchange chamber into sub-heat exchange zones, so that the liquid falling from the upper sub-heat exchange zone is guided along the upper surface of the branch pipe to the surrounding area of ​​the heat exchange chamber, avoiding flowing onto the heat exchange tubes in the lower sub-heat exchange zone, and avoiding liquid accumulation on the heat exchange tubes to form a liquid film that hinders heat exchange.

[0022] 3. The lower side wall of the branch duct of the present invention is provided with an air outlet hole so that the gas can be evenly distributed to the heat exchange tubes in the sub-heat exchange zone. The gas enters from the upper part of the sub-heat exchange zone to the lower part, avoiding contact with other heat exchange tubes with thicker liquid film at the bottom, thereby improving the heat exchange efficiency.

[0023] 4. The upper surface of the bronchial pipe of the present invention is also conducive to heat exchange between the superheated gas in the bronchial pipe and the liquid on the upper surface of the bronchial pipe, reducing the superheat of the gas and making the gas form saturated gas, thereby improving the heat exchange efficiency with the heat exchange tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention is described in detail below in conjunction with specific embodiments and drawings. In order to show details and facilitate understanding of its principles, it is not necessarily drawn to scale, and similar reference numerals may describe similar components in different views. The drawings generally illustrate the embodiments discussed herein by way of example and not limitation. Among them:

[0025] Figure 1 Schematic diagram of the cross section of the heat exchanger of this embodiment.

[0026] Figure 2 Schematic diagram of the air duct inside the heat exchanger of this embodiment.

[0027] In the figure, 1, heat exchange chamber; 2, heat exchange tube; 3, main gas duct; 4, branch duct; 41, air outlet; 5, air inlet; 6, top branch duct; 7, drain port; 8, guide slope; 9, oil-gas separator; 10, baffle; 11, subcooling heat exchange zone. DETAILED DESCRIPTION

[0028] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments, and the following embodiments do not limit the invention involved in the claims. In addition, all combinations of the features described in the embodiments are not necessarily required for the solutions of the invention.

[0029] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0030] Example

[0031] like Figure 1 , 2As shown, a heat exchanger is shown. This embodiment takes the shell and tube condenser of the air conditioning system as an example. The condenser includes a heat exchange chamber 1 in a shell, and a heat exchange tube 2 arranged in the chamber. The heat exchange chamber 1 is provided with a main gas pipeline 3 in an up-and-down direction. The main gas pipeline 3 is connected to an air inlet 5 of the heat exchange chamber 1 and is used to pass the gas to be heat exchanged into the main gas pipeline 3. The main gas pipeline 3 is connected to a plurality of branch pipes 4. In this embodiment, three branch pipes 4 are symmetrically arranged on both sides of the main gas pipeline 3, so that the branch pipes 4 divide the heat exchange chamber 1 into six sub-exchange chambers. The heat exchange tube 2 is arranged in the hot zone and the sub-heat exchange zone. The other end of the branch pipe 4 away from the main gas pipe 3 is tilted downward, so that the liquid falling from the upper sub-heat exchange zone is guided along the upper surface of the branch pipe 4 to the surrounding area of ​​the heat exchange cavity 1, avoiding flowing to the heat exchange tube 2 in the lower sub-heat exchange zone. The lower side wall of the branch pipe 4 is provided with an air outlet 41, so that the gas is evenly distributed to the heat exchange tube 2 in the sub-heat exchange zone. The gas enters from the upper side of the sub-heat exchange zone to the lower side, avoiding other heat exchange tubes 2 with thicker liquid films at the lower part from contacting first, thereby improving the heat exchange efficiency. The upper surface of the branch pipe 4 is also conducive to the heat exchange between the superheated gas in the branch pipe 4 and the liquid on the upper surface of the branch pipe 4, reducing the superheat of the gas, so that the gas forms a saturated gas, thereby improving the heat exchange efficiency with the heat exchange tube 2.

[0032] The air guide channel of this embodiment is a solid pipe, which is different from the prior art (invention patent with application number CN201310740172.8) in which the heat exchange tube 2 is separated and set as the air guide channel. Since this embodiment is a solid pipe, it has a better effect on the uniform distribution of gas, so that the gas can be evenly distributed to various parts of the heat exchange chamber 1 through the gas outlet opened thereon.

[0033] A downward arc-shaped baffle 10 is provided at the end of the bronchial pipe 4. One end of the baffle 10 is connected to the bronchial pipe 4, and the other end forms a liquid outlet relative to the bronchial pipe 4 below it. The baffle 10 and the bronchial pipe 4 form a more closed sub-heat exchange area. The baffle 10 can more effectively prevent the liquid above from flowing into the sub-heat exchange area below, and the liquid can emerge from the liquid outlet.

[0034] It also includes a top branch air duct 6 located at the top of the main air duct 3. The upper and lower side walls of the top branch air duct 6 are provided with air outlet holes 41 for discharging gas upward. A heat exchange tube 2 is provided between the top branch air duct 4 and the heat exchange chamber 1 for dissipating the heat of the upward gas, so that the space of the heat exchange chamber 1 can be fully utilized.

[0035] The bronchial pipes 4 are symmetrically arranged on both sides of the main gas pipe 3, and a drainage port 7 is arranged on the cavity of the heat exchange cavity 1 arranged below the bronchial pipes 4 on both sides. The drainage ports 7 are two symmetrical about the main gas pipe 3 and are used to discharge the liquid guided down from both sides.

[0036] A subcooling heat exchange zone 11 formed by a subcooling heat exchange tube is arranged above the drain port 7 along the inner wall of the heat exchange chamber 1, so that the liquid flowing down from the top is further cooled by the subcooling heat exchange tube and then discharged from the drain port 7 below.

[0037] A flow guiding slope 8 is provided between the main gas pipeline 3 and the two liquid drain ports 7 so as to guide the liquid in the lowermost sub-heat exchange zone to the liquid drain ports 7 .

[0038] An oil-gas separator 9 is provided at the air inlet 5 of the heat exchange chamber 1. The oil-gas separator 9 can be any of various existing conventional oil-gas separators suitable for installation here, as long as it can achieve oil-gas separation and purify the oil mixed in the gas to prevent the oil from entering the pipeline and the heat exchange chamber. The air inlet 5 of the heat exchange chamber 1 is located below the guide slope 8 to form an installation space for the oil-gas separator 9.

[0039] Although some terms are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention. The execution order of actions, steps, etc. in the devices and methods shown in the specification and the drawings can be implemented in any order as long as there is no special explicit limitation on the order and the output of the previous processing is not used in the subsequent processing. Similar sequential terms (for example, "first", "next", "secondly", "again", "then", etc.) used for the convenience of description do not mean that they must be implemented in such an order.

[0040] It should be understood by those skilled in the art that all directional references (for example, above, below, upward, up, downward, down, top, bottom, left, right, vertical, horizontal, etc.) are used descriptively in the drawings to facilitate the reader's understanding, and do not represent limitations (for example, on position, orientation or use, etc.) on the scope of the invention as defined by the appended claims. They are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the referred device or element must have a specific orientation or be constructed and operated in a specific orientation. The directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0041] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0042] In addition, some vague terms (e.g., substantially, certain, generally, etc.) may refer to slight inaccuracies or slight deviations of conditions, quantities, values, or dimensions, some of which are within the manufacturing deviation or tolerance range. It should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meanings and therefore cannot be understood as limiting the scope of protection of this application.

[0043] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them in similar ways, without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A heat exchanger, comprising a heat exchange chamber and a heat exchange tube arranged in the chamber, characterized in that: A main air duct in an up-and-down direction is provided in the heat exchange chamber, the main air duct is connected to an air inlet of the heat exchange chamber, a plurality of branch air ducts are connected to the main air duct, the branch air ducts divide the heat exchange chamber into a plurality of sub-heat exchange areas, the other end of the branch air duct away from the main air duct is tilted downward, an air outlet is provided on a lower side wall of the branch air duct; a downward baffle is provided at the end of the branch air duct, one end of the baffle is connected to the branch air duct, and the other end forms a liquid outlet relative to the branch air duct below it; and also includes a top branch air duct located at the top of the main air duct, the upper and lower side walls of the top branch air duct are both provided with air outlets, and a heat exchange tube is provided between the top of the top branch air duct and the heat exchange chamber.

2. The heat exchanger according to claim 1, characterized in that: The bronchial pipes are symmetrically arranged on both sides of the main air pipe, and drainage ports are arranged on the cavity bodies of the heat exchange cavities below the bronchial pipes on both sides.

3. The heat exchanger according to claim 2, characterized in that: A subcooling heat exchange pipe is arranged above the liquid discharge port along the inner wall of the heat exchange cavity.

4. The heat exchanger according to claim 2 or 3, characterized in that: The liquid drain ports are two and are symmetrically arranged with respect to the main gas pipeline.

5. The heat exchanger according to claim 4, characterized in that: A flow guiding slope is arranged between the main gas pipeline and the two liquid discharge ports.

6. The heat exchanger according to claim 5, characterized in that The heat exchange cavity air inlet is located below the guide slope.

7. The heat exchanger according to claim 1, characterized in that An oil-gas separator is arranged at the air inlet of the heat exchange chamber.

8. Air conditioning equipment, characterized in that Comprising the heat exchanger according to any one of claims 1 to 7.

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