CN114812226A - Dry heat exchanger and air conditioning unit - Google Patents

Dry heat exchanger and air conditioning unit Download PDF

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Publication number
CN114812226A
CN114812226A CN202210333069.0A CN202210333069A CN114812226A CN 114812226 A CN114812226 A CN 114812226A CN 202210333069 A CN202210333069 A CN 202210333069A CN 114812226 A CN114812226 A CN 114812226A
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CN
China
Prior art keywords
heat exchange
liquid
exchange tube
refrigerant
cavity
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210333069.0A
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Chinese (zh)
Inventor
孟庆良
王雷
何建奇
宋强
赵雷
顾超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Original Assignee
Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qingdao Haier Air Conditioner Gen Corp Ltd, Qingdao Haier Air Conditioning Electric Co Ltd, Haier Smart Home Co Ltd filed Critical Qingdao Haier Air Conditioner Gen Corp Ltd
Priority to CN202210333069.0A priority Critical patent/CN114812226A/en
Publication of CN114812226A publication Critical patent/CN114812226A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/06—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits having a single U-bend
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/0202—Header boxes having their inner space divided by partitions
    • F28F9/0204—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions
    • F28F9/0209—Header boxes having their inner space divided by partitions for elongated header box, e.g. with transversal and longitudinal partitions having only transversal partitions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/02—Header boxes; End plates
    • F28F9/026—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits
    • F28F9/0282—Header boxes; End plates with static flow control means, e.g. with means for uniformly distributing heat exchange media into conduits by varying the geometry of conduit ends, e.g. by using inserts or attachments for modifying the pattern of flow at the conduit inlet or outlet

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The application relates to the technical field of heat exchange equipment, and discloses a dry-type heat exchanger which comprises a tube plate, a shell, a heat exchange tube group and an end plate, wherein the shell is arranged on one side of the tube plate, the tube plate is connected with the shell to form a heat exchange cavity, and a liquid inlet and a liquid outlet are formed in the shell; the heat exchange tube group is arranged in the heat exchange cavity and comprises a first heat exchange tube group and a second heat exchange tube group; the end plate is arranged on the other side of the tube plate and connected with the tube plate, the outer side wall of the end plate is provided with at least one refrigerant inlet and at least one refrigerant outlet, a hollow liquid equalizing cavity is formed in the end plate between the refrigerant inlet and the refrigerant outlet, the first end of the first heat exchange tube set is connected with the refrigerant inlet, the first end of the second heat exchange tube set is connected with the refrigerant outlet, and the second end of the first heat exchange tube set and the second end of the second heat exchange tube set penetrate through the tube plate and are communicated with the liquid equalizing cavity. Through set up the samming chamber in the end plate, improved the heat transfer effect of heat exchanger and the flexibility of heat exchange tube group design. The application also discloses an air conditioning unit.

Description

Dry heat exchanger and air conditioning unit
Technical Field
The application relates to the technical field of heat exchange equipment, for example to a dry heat exchanger and an air conditioning unit.
Background
At present, a dry heat exchanger is one of important components of a central air conditioner, and generally includes a housing and a plurality of refrigerant pipes disposed in the housing, wherein the housing is provided with a cold water inlet and a cold water outlet, a refrigerant flows in the refrigerant pipes, and cold water flows in the housing, thereby achieving heat exchange between the refrigerant and the cold water.
In the related art, the dry heat exchanger comprises a tube plate, a tube cavity and a heat exchange cavity, wherein the tube cavity and the heat exchange cavity are arranged on two sides of the tube plate, a refrigerant tube is arranged in the heat exchange cavity, a split-range partition plate is arranged in the tube cavity to divide the tube cavity into a liquid inlet cavity and a liquid outlet cavity, and two ends of the refrigerant tube are respectively communicated with the liquid inlet cavity and the liquid outlet cavity.
In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:
the liquid effect that equalizes of the mode that sets up between above-mentioned lumen and the refrigerant pipe is relatively poor, and the heat transfer effect of heat exchanger is relatively poor.
Disclosure of Invention
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.
The embodiment of the disclosure provides a dry heat exchanger and an air conditioning unit, and the first heat exchange pipe set and the second heat exchange pipe set can be connected in series by arranging a liquid equalizing cavity on an end plate, so that the liquid equalizing effect of the liquid equalizing cavity is improved, and the heat exchange efficiency of the dry heat exchanger is improved.
In some embodiments, the dry heat exchanger comprises a tube plate, a shell, a heat exchange tube set and an end plate, wherein the shell is arranged on one side of the tube plate, the tube plate is connected with the shell to form a heat exchange cavity, and a liquid inlet and a liquid outlet are arranged on the shell; the heat exchange tube group is arranged in the heat exchange cavity and comprises a first heat exchange tube group and a second heat exchange tube group; the end plate set up in the opposite side of tube sheet and with the tube sheet is connected, the lateral wall of end plate is provided with at least one refrigerant import and at least one refrigerant export, just, the refrigerant import with the inside of end plate between the refrigerant export has hollow liquid-equalizing chamber, the first end of first heat exchange pipe group with refrigerant import connects, the first end of second heat exchange pipe group with refrigerant exit linkage, the second end of first heat exchange pipe group with the second end of second heat exchange pipe group all runs through the tube sheet with liquid-equalizing chamber intercommunication.
Optionally, the ratio of the number of heat exchange tubes of the first heat exchange tube group to the number of heat exchange tubes of the second heat exchange tube group is 1: n, wherein n is greater than 0.
Optionally, a liquid equalizing structure is arranged inside the liquid equalizing cavity to prevent the refrigerant in the liquid equalizing cavity from being subjected to gas-liquid stratification.
Optionally, the liquid equalizing structure is clamped between the outer side wall of the end plate and the tube plate.
Optionally, the liquid equalizing structure includes an elbow, one end of the elbow is connected to the second end of the first heat exchange tube set, and the other end of the elbow is connected to the second end of the second heat exchange tube set.
Optionally, the liquid equalizing structure is a casting member and includes a cylinder, the cylinder is provided with a plurality of liquid inlet holes and a plurality of liquid outlet holes, the plurality of liquid inlet holes are disposed below the plurality of liquid outlet holes, the liquid inlet holes are connected to the second end of the first heat exchange tube set, the liquid outlet holes are connected to the second end of the second heat exchange tube set, and the liquid inlet holes and the liquid outlet holes are communicated through a bending cavity.
Optionally, the ratio of the number of the liquid inlet holes to the number of the liquid outlet holes is 1: n, the ratio of the number of the liquid inlet ends of the bending cavity to the number of the liquid outlet ends of the bending cavity is also 1: n, wherein n is greater than 0.
Optionally, a tapered opening is formed in the periphery of the liquid outlet hole, and the tapered opening is connected with the second end of the second heat exchange tube group to increase the flow rate of the refrigerant.
Optionally, a plurality of through holes are formed in a region, corresponding to the liquid equalizing chamber, of the tube plate, the second end of the first heat exchange tube group and the second end of the second heat exchange tube group penetrate through the through holes, and the sum of the number of the liquid inlet holes and the number of the liquid outlet holes in the column body is equal to the number of the through holes.
In some embodiments, the air conditioning pack includes the above-described dry heat exchanger.
The dry heat exchanger and the air conditioning unit provided by the embodiment of the disclosure can realize the following technical effects:
the dry heat exchanger provided by the embodiment of the disclosure comprises a tube plate, a shell, a heat exchange tube group and end plates, wherein the shell and the end plates are respectively arranged on two sides of the tube plate, a heat exchange cavity is formed between an air conditioner and the tube plate, and the heat exchange tube group is arranged inside the heat exchange cavity. The end plate is internally provided with a hollow liquid equalizing cavity, and the first heat exchange pipe set and the second heat exchange pipe set are communicated with the liquid equalizing cavity. The first heat exchange tube group and the second heat exchange tube group are communicated through the liquid equalizing cavity, the first heat exchange tube group and the second heat exchange tube group can be connected in series, and a refrigerant in the first heat exchange tube group can be redistributed in the liquid equalizing cavity and then enters the second heat exchange tube group, so that multi-pass heat exchange is realized, and the heat exchange effect of the dry heat exchanger is improved. In addition, by arranging the liquid equalizing cavity, the first heat exchange tube group and the second heat exchange tube group can have different tube arrangement modes, the distribution proportion of the first heat exchange tube group and the second heat exchange tube group can be designed according to different heat exchange effect requirements, and the design flexibility of the heat exchange tube group is improved.
The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the accompanying drawings and not in limitation thereof, in which elements having the same reference numeral designations are shown as like elements and not in limitation thereof, and wherein:
FIG. 1 is a schematic diagram of a dry heat exchanger according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural view of an end plate provided by embodiments of the present disclosure;
FIG. 3 is a side view of an end plate provided by embodiments of the present disclosure;
FIG. 4 is a schematic view of a dry heat exchanger according to an embodiment of the present disclosure in a tube layout;
FIG. 5 is a schematic view of another tube layout for a dry heat exchanger according to embodiments of the present disclosure;
FIG. 6 is a schematic structural diagram of a liquid-homogenizing structure provided by an embodiment of the present disclosure;
FIG. 7 is a cross-sectional view taken at A-A in FIG. 6;
FIG. 8 is a schematic structural diagram of another liquid-homogenizing structure provided by an embodiment of the present disclosure;
FIG. 9 is a cross-sectional view taken at B-B of FIG. 8;
FIG. 10 is a schematic view of a structure of a liquid separating device provided by the embodiment of the disclosure;
FIG. 11 is a cross-sectional view taken at C-C of FIG. 10;
FIG. 12 is a schematic view of a portion of a dispensing device according to an embodiment of the present disclosure;
fig. 13 is another schematic structural diagram of a portion of a liquid separation device according to an embodiment of the disclosure.
Reference numerals:
10: a housing; 11: a first heat exchange tube set; 12: a second heat exchange tube set; 101: a liquid inlet; 102: a liquid outlet; 20: a tube sheet; 30: an end plate; 301: a refrigerant inlet; 302: a refrigerant outlet; 31: a liquid homogenizing chamber; 311: a cylinder; 312: a liquid inlet hole; 313: a liquid outlet hole; 314: bending the cavity; 315: a tapered opening; 32: a liquid separating device; 321: a first liquid separation box; 322: a first dispensing port; 323: a second liquid separation box; 324: and a second dispensing hole.
Detailed Description
So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.
The terms "first," "second," and the like in the description and in the claims, and the above-described drawings of embodiments of the present disclosure, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present disclosure described herein may be made. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.
In the embodiments of the present disclosure, the terms "upper", "lower", "inner", "middle", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the disclosed embodiments and their embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation. Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art as appropriate.
In addition, the terms "disposed," "connected," and "secured" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. Specific meanings of the above terms in the embodiments of the present disclosure can be understood by those of ordinary skill in the art according to specific situations.
The term "plurality" means two or more, unless otherwise specified.
In the embodiment of the present disclosure, the character "/" indicates that the preceding and following objects are in an or relationship. For example, A/B represents: a or B.
The term "and/or" is an associative relationship that describes objects, meaning that three relationships may exist. For example, a and/or B, represents: a or B, or A and B.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.
The embodiment of the disclosure provides an air conditioning unit.
The air conditioning unit provided by the embodiment of the disclosure comprises a compressor, a throttling element and a dry heat exchanger. Through using the dry heat exchanger of this application in air conditioning unit, can set up different stringing modes to heat exchange tube group according to the heat transfer volume demand of difference, satisfy the user demand under the different operating modes of air conditioning unit, improve air conditioning unit's efficiency. In addition, the tube plate 20 and the end plate 30 of the dry heat exchanger do not need to be welded, the risk of refrigerant leakage possibly caused by welding of adjacent components of the heat exchanger is avoided, and the reliability of the air conditioning unit is improved.
In some embodiments, the dry heat exchanger includes a tube plate 20, a shell 10, a heat exchange tube group, and an end plate 30, the shell 10 is disposed on one side of the tube plate 20, the tube plate 20 is connected with the shell 10 to form a heat exchange cavity, and the shell 10 is provided with a liquid inlet 101 and a liquid outlet 102; the heat exchange tube group is arranged in the heat exchange cavity and comprises a first heat exchange tube group 11 and a second heat exchange tube group 12; the end plate 30 is disposed on the other side of the tube plate 20 and connected to the tube plate 20, the outer side wall of the end plate 30 is provided with at least one refrigerant inlet 301 and at least one refrigerant outlet 302, a hollow liquid-equalizing chamber 31 is disposed inside the end plate 30 between the refrigerant inlet 301 and the refrigerant outlet 302, the first end of the first heat exchange tube set 11 is connected to the refrigerant inlet 301, the first end of the second heat exchange tube set 12 is connected to the refrigerant outlet 302, and the second end of the first heat exchange tube set 11 and the second end of the second heat exchange tube set 12 both penetrate through the tube plate 20 and communicate with the liquid-equalizing chamber 31.
The dry heat exchanger provided by the embodiment of the present disclosure includes a tube plate 20, a shell 10, a heat exchange tube group and an end plate 30, wherein the shell 10 and the end plate 30 are respectively disposed at two sides of the tube plate 20, a heat exchange cavity is formed between an air conditioner and the tube plate 20, and the heat exchange tube group is disposed inside the heat exchange cavity. The end plate 30 has a hollow liquid equalizing chamber 31 inside, and the first heat exchange tube group 11 and the second heat exchange tube group 12 are both communicated with the liquid equalizing chamber 31. The first heat exchange tube group 11 and the second heat exchange tube group 12 are communicated through the liquid equalizing cavity 31, so that the first heat exchange tube group 11 and the second heat exchange tube group 12 can be connected in series, and a refrigerant in the first heat exchange tube group can be redistributed into the second heat exchange tube group 12 after being mixed in the liquid equalizing cavity 31, so that the heat exchange of multiple tube passes is realized, and the heat exchange effect of the dry heat exchanger is improved. In addition, by arranging the liquid equalizing cavity 31, the first heat exchange tube group 11 and the second heat exchange tube group 12 can have different tube arrangement modes, the tube arrangement proportion of the first heat exchange tube group 11 and the second heat exchange tube group 12 can be designed according to different heat exchange effect requirements, and the design flexibility of the heat exchange tube groups is improved.
Optionally, there is a removable connection between the tube sheet 20 and the end plate 30.
The tube plate 20 and the end plate 30 may be provided at their outer peripheries with fixing flanges fixedly mounted therebetween by bolts and gaskets. Therefore, welding between the tube plate 20 and the end plate 30 is avoided, welding points in the dry heat exchanger are reduced, leakage of a refrigerant at the welding points of the heat exchanger is prevented, and the sealing performance inside the dry heat exchanger is improved.
Alternatively, the number of the refrigerant inlets 301 may be 2, and the number of the refrigerant outlets 302 may also be 2.
The single dry heat exchanger is provided with 2 refrigerant inlets 301 and 2 refrigerant outlets 302, can correspond to the main machine of the double system, and realizes independent control and alternate defrosting of the single system or alternate operation according to the load requirement of the main machine.
Optionally, the first heat exchange tube set 11 includes a plurality of first heat exchange tubes, the second heat exchange tube set 12 includes a plurality of second heat exchange tubes, and the first heat exchange tubes and the second heat exchange tubes are both U-shaped.
As shown in fig. 1, a first heat exchange tube set 11 and a second heat exchange tube set 12 are disposed in a casing 10 of the dry heat exchanger, a refrigerant inlet 301 is disposed at a lower portion of an outer sidewall of an end plate 30, and a refrigerant outlet 302 is disposed above the refrigerant inlet 301. A cavity is formed in the end plate 30 between the refrigerant inlet 301 and the refrigerant outlet 302, and the cavity is a liquid equalizing cavity 31. The refrigerant enters the first end of the first heat exchange tube group 11 from the refrigerant inlet 301, flows from the first end of the first heat exchange tube group 11 to the second end of the first heat exchange tube group 11, then enters the liquid equalizing cavity 31, and the refrigerants in the first heat exchange tubes all enter the liquid equalizing cavity 31 and are mixed, so that the uniformity of refrigerant mixing is improved. Then, the refrigerant in the liquid equalizing chamber 31 is redistributed to enter the second end of the second heat exchange tube set 12, flows from the second end of the second heat exchange tube set 12 to the first end of the second heat exchange tube set 12, and finally flows out from the refrigerant outlet 302, so that the above-mentioned cycle is performed continuously.
Optionally, the ratio of the number of heat exchange tubes of the first heat exchange tube group 11 to the number of heat exchange tubes of the second heat exchange tube group 12 is 1: n, wherein n is greater than 0.
The value of n is related to the heat exchange quantity requirement of the dry heat exchanger, the value of n can be 1/3, 1/2, 1, 2, 3 or 4, and the like, and the value of n can be selected according to the actual heat exchange requirement. For example, n can be 2 or 3 in a dry heat exchanger for biased cooling; in the dry heat exchanger for bias heating, the value of n can be 1/3, 1/2 and the like.
The dry heat exchanger in the embodiment of the present disclosure can realize multiple pipe arrangement modes of the heat exchange pipe set by arranging the liquid equalizing cavity 31, so that the heat exchange pipe set is more flexible to arrange, and heat exchange requirements under different working conditions can be met.
As an example, when n is equal to 1, as shown in fig. 4, the number of the first heat exchange tubes of the first heat exchange tube group 11 is equal to the number of the second heat exchange tubes of the second heat exchange tube group 12, and the ratio of the number of the first heat exchange tubes at the refrigerant inlet 301 end, the sum of the number of the first heat exchange tubes and the second heat exchange tubes communicated with the liquid equalizing chamber 31, and the number of the second heat exchange tubes at the refrigerant outlet 302 end is 1:2: 1.
As another example, when n is equal to 2, as shown in fig. 5, the ratio of the number of first heat exchange tubes of the first heat exchange tube group 11 to the number of second heat exchange tubes of the second heat exchange tube group 12 is 1:2, and the ratio of the number of first heat exchange tubes at the refrigerant inlet 301 end, the sum of the number of first heat exchange tubes and second heat exchange tubes communicating with the liquid equalizing chamber 31, and the number of second heat exchange tubes at the refrigerant outlet 302 end is 1:3: 2.
Alternatively, the number of the liquid equalizing chambers 31 is two, and the two liquid equalizing chambers 31 are arranged side by side in the horizontal direction.
As shown in fig. 2, the two liquid equalizing chambers 31 are separated by the sealing groove line, so that two independent liquid equalizing chambers 31 are conveniently formed, and the refrigerants in the first heat exchange tube set 11 are respectively and uniformly mixed in the two independent chambers and then enter the second heat exchange tube set 12, which is beneficial to improving the heat exchange effect of the dry heat exchanger.
Optionally, a liquid equalizing structure is disposed inside the liquid equalizing chamber 31 to prevent the refrigerant in the liquid equalizing chamber 31 from being layered into gas and liquid.
It can be understood that the refrigerant in the liquid equalizing chamber 31 may be a gas-liquid two-phase refrigerant, and the gas-liquid stratification may occur due to gravity after the refrigerant is mixed in the liquid equalizing chamber 31, so as to affect the heat exchange effect of the dry heat exchanger. Through set up the liquid structure in the liquid-equalizing chamber 31, can prevent that the refrigerant in the liquid-equalizing chamber 31 from taking place the phenomenon of gas-liquid layering, be favorable to improving dry heat exchanger's heat transfer effect.
Optionally, a liquid-homogenizing structure is sandwiched between the outer sidewall of the end plate 30 and the tube sheet 20.
In order to fix the liquid equalizing structure conveniently, the liquid equalizing structure can be fixed by means of extrusion between the outer side wall of the end plate 30 and the tube plate 20, and the fixing mode is simple and easy to implement.
Optionally, the liquid equalizing structure comprises a bent pipe, one end of the bent pipe is connected with the second end of the first heat exchange pipe set 11, and the other end of the bent pipe is connected with the second end of the second heat exchange pipe set 12.
As an example, the liquid-equalizing structure may be a bent pipe connecting the first heat exchange pipe and the second heat exchange pipe, the bent pipe and the heat exchange pipes may be connected by welding or clamping, and for better fixing the bent pipe, a bracket may be disposed in the liquid-equalizing chamber 31 to support the bent pipe.
Optionally, the liquid homogenizing structure is a casting member, and includes a column 311, the column 311 is provided with a plurality of liquid inlet holes 312 and a plurality of liquid outlet holes 313, the plurality of liquid inlet holes 312 are disposed below the plurality of liquid outlet holes 313, the liquid inlet hole 312 is connected to the second end of the first heat exchange tube set 11, the liquid outlet hole 313 is connected to the second end of the second heat exchange tube set 12, and the liquid inlet hole 312 and the liquid outlet hole 313 are communicated through a bending cavity 314.
As another example, the liquid-uniforming structure may also be a casting having a bending cavity 314 provided therein, as shown in FIG. 6. The thickness of the column 311 is equal to the thickness of the homogenizing chamber 31, so that the column 311 can be sandwiched between the end plate 30 and the tube plate 20. One side of the column 311 is provided with a plurality of liquid inlet holes 312 and liquid outlet holes 313, the liquid inlet holes 312 are arranged below the liquid outlet holes 313, each liquid inlet hole 312 is communicated with each liquid outlet hole 313 through a bending cavity 314, and the bending cavity 314 is shaped like a pipeline in the column 311 and can convey refrigerant, as shown in the cross-sectional view of fig. 7. The liquid equalizing structure is arranged as a casting piece, welding between adjacent pipelines can be avoided, leakage of a refrigerant between the pipelines can be prevented, and the sealing performance and the reliability of the heat exchanger are improved.
Optionally, the ratio of the number of liquid inlet holes 312 to the number of liquid outlet holes 313 is 1: n, the ratio of the number of the liquid inlet ends of the bending cavity 314 to the number of the liquid outlet ends of the bending cavity 314 is also 1: n, wherein n is greater than 0.
It can be understood that the number of the liquid inlet holes 312 and the number of the liquid outlet holes 313 on the column 311 are related to the pipe arrangement mode of the first heat exchange pipe set 11 and the second heat exchange pipe set 12 connected to the liquid equalizing chamber 31, and n can be 1/3, 1/2, 1, 2, 3 or 4, etc. For example, when the number of the first heat exchange tubes of the first heat exchange tube group 11 is equal to the number of the second heat exchange tubes of the second heat exchange tube group 12, the number of the liquid inlet holes 312 is equal to the number of the liquid outlet holes 313, and the number of the liquid inlet ends of the bending cavities 314 is equal to the number of the liquid outlet ends thereof; when the ratio of the number of the first heat exchange tubes of the first heat exchange tube set 11 to the number of the second heat exchange tubes of the second heat exchange tube set 12 is 1:2, the ratio of the number of the liquid inlet holes 312 to the number of the liquid outlet holes 313 is also 1:2, the number of the liquid inlet ends and the number of the liquid outlet ends of the bending cavity 314 are also 1: 2.
as an example, when n is equal to 1, the number of liquid inlet holes 312 on the column 311 is equal to the number of liquid outlet holes 313, and the number of liquid inlet ends of the bending cavity 314 is equal to the number of liquid outlet ends thereof. As shown in fig. 6, the communication mode of the bending chamber 314 will be described by taking an example in which a 3-line liquid outlet 312 and a 3-line liquid outlet 313 are provided in this order from bottom to top on the column 311. The liquid inlet hole 312 of the 1 st row on the column 311 is communicated with the liquid outlet hole 313 of the 3 rd row on the column 311 through the bending cavity 314, the liquid inlet hole 312 of the 2 nd row on the column 311 is communicated with the liquid outlet hole 313 of the 2 nd row on the column 311, and the liquid inlet hole 312 of the 3 rd row on the column 311 is communicated with the liquid outlet hole 313 of the 1 st row on the column 311. The provision of the crimping cavity 314 within the cylinder 311 is shown in figure 7. By adopting the above mode to set up the bending cavity 314, the circulation of the refrigerant can be avoided to be influenced by the cross between the different bending cavities 314, and meanwhile, the refrigerant flows through the preset bending cavity 314, so that the gas-liquid layering of the refrigerant caused by gravity under the condition that the liquid equalizing structure is not arranged is avoided, and the heat exchange effect of the dry heat exchanger is improved.
Optionally, the number of rows of the liquid inlet holes 312 and the number of rows of the liquid outlet holes 313 in the column 311 may also be 4, 5 or 6, and the like, and may be set according to the heat exchange requirement of the dry heat exchanger, and the size, number and arrangement of the liquid inlet holes 312 and the liquid outlet holes 313 are not specifically limited in this application.
As another example, when n is equal to 2, the ratio of the number of liquid inlet holes 312 to the number of liquid outlet holes 313 on the column 311 is 1:2, and the ratio of the number of liquid inlet ends to the number of liquid outlet ends of the bending cavity 314 is 1: 2. At this time, the structure of the bending cavity 314 is similar to a 1-to-2 elbow, and the refrigerant enters from the liquid inlet end of the bending cavity 314 and flows out from the two liquid outlet ends of the bending cavity 314. The connection mode of the bending cavities 314 is similar to that of the bending cavities 314 when n is equal to 1, so that intersection among the bending cavities 314 cannot occur, and rapid circulation of the refrigerant along a preset path is facilitated.
Optionally, the liquid outlet holes 313 are provided with tapered ports 315 at the outer peripheries thereof, and the tapered ports 315 are connected to the second end of the second heat exchange tube set 12 to increase the flow rate of the refrigerant.
It can be understood that the caliber of the tapered opening 315 is smaller than the caliber of the bending cavity 314, and the flow rate of the refrigerant is increased due to the change of pressure after the refrigerant flows into the tapered opening 315 from the bending cavity 314, thereby improving the heat exchange efficiency of the dry heat exchanger.
As an example, a liquid equalizing cavity 31 is provided in the end plate 30 of the dry heat exchanger provided in the embodiment of the present disclosure, a liquid equalizing structure is provided in the liquid equalizing cavity 31, the liquid equalizing structure is shown in fig. 8 and 9, and a tapered opening 315 is provided on the periphery of the liquid outlet hole 313 of the cylinder 311. In the related art, the dry heat exchanger is not provided with the liquid equalizing chamber 31, and the liquid equalizing chamber 31 is not provided with a liquid equalizing structure. The heat exchange coefficients of the dry heat exchanger provided in the embodiment of the present disclosure and those of the dry heat exchanger in the related art are shown in table 1 below.
TABLE 1
Figure BDA0003575748270000091
In the above table 1, unit refers to heat exchange units, and unit1 to unit6 refer to different heat exchange units in the direction from the end plate 30 to the end of the shell 10, that is, the dry heat exchanger in fig. 1 is in the order from left to right. As can be seen from table 1, the heat exchange coefficient of the dry heat exchanger in the embodiment of the present disclosure is generally greater than that of the dry heat exchanger in the related art, and the dry heat exchanger in the embodiment of the present disclosure has a better heat exchange effect by providing the liquid equalizing cavity 31 and the liquid equalizing structure.
Optionally, a plurality of through holes are provided in the area of the tube plate 20 corresponding to the liquid equalizing chamber 31, the second end of the first heat exchange tube set 11 and the second end of the second heat exchange tube set 12 penetrate through the through holes, and the sum of the numbers of the liquid inlet holes 312 and the liquid outlet holes 313 on the cylinder 311 is equal to the number of the through holes.
It can be understood that the plurality of first heat exchange tubes of the first heat exchange tube set 11 and the plurality of second heat exchange tubes of the second heat exchange tube set 12 penetrate through the through holes on the tube plate 20 to enter the liquid homogenizing chamber 31 and are connected with the liquid inlet hole 312 and the liquid outlet hole 313 of the liquid homogenizing structure. In this way, the sum of the number of the liquid inlet holes 312 and the liquid outlet holes 313 on the liquid-homogenizing structure is equal to the number of the through holes, so as to adapt to the arrangement of the liquid-homogenizing chamber 31 and the liquid-homogenizing structure in the embodiment of the present application.
Optionally, a hollow liquid inlet cavity is disposed at a connection position of the end plate 30 and the refrigerant inlet 301, and a liquid separating device 32 is disposed in the liquid inlet cavity, so that the gas-phase refrigerant and the liquid-phase refrigerant are uniformly mixed, and separation of the gas-phase refrigerant and the liquid-phase refrigerant is prevented.
Optionally, the liquid separating device 32 includes a first liquid separating box 321 and a second liquid separating box 323 which are stacked, a first mixing cavity is formed by the first liquid separating box 321 and the inner side wall of the end plate 30, a second mixing cavity is formed by the second liquid separating box 323 and the inner side wall of the end plate 30, the refrigerant inlet 301 is communicated with the first mixing cavity, the first mixing cavity and the second mixing cavity are communicated through a first liquid separating hole 322, and the second mixing cavity is communicated with the first heat exchange tube group 11 through a second liquid separating hole 324; the aperture of the first liquid separation hole 322 is larger than the aperture of the second liquid separation hole 324.
Through the arrangement, the gas-phase refrigerant and the liquid-phase refrigerant entering the liquid separating device 32 from the refrigerant inlet 301 are firstly mixed in the first mixing cavity and then enter the second mixing cavity through the first liquid separating hole 322 for further mixing, so that the gas-liquid two-phase refrigerant forms a mist refrigerant, and the mixing uniformity of the gas-liquid two-phase refrigerant is further improved.
Optionally, the number of the first liquid separation holes 322 is multiple and two layers, and the upper and lower layers of the first liquid separation holes 322 are arranged in a triangle.
Therefore, when the refrigerant flows into the second mixing cavity, the refrigerant flowing through the upper and lower layers of the first liquid separation holes 322 interfere with each other, which is beneficial to scattering the gas-liquid two-phase refrigerant, so that the gas-liquid two-phase refrigerant is more uniformly mixed.
Optionally, the number of the second liquid distribution holes 324 is multiple and three, the second liquid distribution holes 324 of two adjacent layers are arranged in a triangular shape, and the number of the second liquid distribution holes 324 is greater than the number of the first liquid distribution holes 322.
Thus, when the refrigerant enters the first heat exchange tube set 11 from the second mixing cavity, the refrigerants flowing through the second liquid dividing holes 324 of two adjacent layers interfere with each other, so that the gas-liquid two-phase refrigerant is mixed more uniformly. Moreover, the number of the second liquid dividing holes 324 is greater than that of the first liquid dividing holes 322, so that the refrigerant enters the second mixing cavity from the first liquid dividing holes 322, and when the second liquid dividing holes 324 enter the first heat exchange tube set 11, the space of the liquid dividing holes is reduced, the number of the liquid dividing holes is increased, the refrigerant can enter the heat exchange tubes of the first heat exchange tube set 11 quickly, and the heat exchange efficiency of the dry heat exchanger is improved.
In practical applications, the aperture and number of the first liquid separation holes 322 and the second liquid separation holes 324 may be set according to experience or heat exchange requirements, and the aperture and number of the liquid separation holes are not particularly limited in the embodiments of the present disclosure.
Optionally, the number of the liquid separating devices 32 is two, and the two liquid separating devices 32 are arranged side by side in the horizontal direction.
It will be understood that each of the liquid-separating devices 32 may be provided with a refrigerant inlet 301, and the end plate 30 forms two first mixing chambers arranged side by side and two second mixing chambers arranged side by side. Therefore, the mixing uniformity of the gas-phase refrigerant and the liquid-phase refrigerant is further improved, and the heat exchange effect of the dry heat exchanger is improved conveniently.
In practical applications, the two sets of the first liquid separation box 321 and the second liquid separation box 323 are not limited to be arranged in the horizontal direction, for example, the two sets of the first liquid separation box 321 and the second liquid separation box 323 may be arranged side by side in the vertical direction, and so on. The arrangement mode of the two liquid separation boxes is not specifically limited in the embodiment of the disclosure.
Optionally, the liquid separating device 32 further includes a speed increasing member, one end of the speed increasing member is communicated with the second mixing cavity, and the other end of the speed increasing member is communicated with the heat exchange tube of the first heat exchange tube set 11. Under the effect of acceleration rate component, can spray the refrigerant in the second mixed intracavity fast in the heat exchange pipe to further improve dry heat exchanger's heat exchange efficiency.
Optionally, the speed increasing member includes a first channel and a second channel which are communicated with each other, the inner diameter of the first channel is larger than that of the second channel, the first channel is communicated with the second mixing cavity, and the second channel is communicated with the heat exchange tubes of the first heat exchange tube set 11. Through the arrangement, when gas-liquid two-phase refrigerants in the second mixing cavity enter the first channel and the second channel, the refrigerants flow along the tapered channel with the gradually reduced inner diameter, the flow speed is improved, and therefore the refrigerants are rapidly sprayed into the heat exchange tube, and the heat exchange efficiency of the dry heat exchanger is improved.
Optionally, the inner diameter of the first channel and/or the second channel decreases gradually in a direction away from the second mixing chamber. By providing the first channel or the second channel as a tapered channel having an inner diameter gradually decreasing in the flow direction of the refrigerant, or by providing both the first channel and the second channel as tapered channels having an inner diameter gradually decreasing in the direction of the refrigerant flow channel, the flow rate of the refrigerant entering the heat exchange tubes of the first heat exchange tube group 11 can be further increased, thereby further improving the heat exchange efficiency of the dry heat exchanger.
The above description and drawings sufficiently illustrate embodiments of the disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (10)

1. A dry heat exchanger, comprising:
a tube sheet;
the shell is arranged on one side of the tube plate, the tube plate is connected with the shell to form a heat exchange cavity, and a liquid inlet and a liquid outlet are formed in the shell;
the heat exchange tube group is arranged inside the heat exchange cavity and comprises a first heat exchange tube group and a second heat exchange tube group; and the combination of (a) and (b),
the heat exchange tube set comprises a tube plate, an end plate and a first heat exchange tube set, wherein the end plate is arranged on the other side of the tube plate and connected with the tube plate, the outer side wall of the end plate is provided with at least one refrigerant inlet and at least one refrigerant outlet, a hollow liquid equalizing cavity is formed in the inner portion of the end plate between the refrigerant inlet and the refrigerant outlet, the first end of the first heat exchange tube set is connected with the refrigerant inlet, the first end of the second heat exchange tube set is connected with the refrigerant outlet, and the second end of the first heat exchange tube set and the second end of the second heat exchange tube set penetrate through the tube plate and the liquid equalizing cavity.
2. A dry heat exchanger according to claim 1,
the ratio of the number of the heat exchange tubes of the first heat exchange tube group to the number of the heat exchange tubes of the second heat exchange tube group is 1: n, wherein n is greater than 0.
3. A dry heat exchanger according to claim 1,
the liquid equalizing structure is arranged inside the liquid equalizing cavity to prevent the refrigerant in the liquid equalizing cavity from generating gas-liquid stratification.
4. A dry heat exchanger according to claim 3,
the liquid-equalizing structure is clamped between the outer side wall of the end plate and the tube plate.
5. A dry heat exchanger as recited in claim 3 wherein said liquid-equalizing structure comprises:
and one end of the bent pipe is connected with the second end of the first heat exchange pipe set, and the other end of the bent pipe is connected with the second end of the second heat exchange pipe set.
6. A dry heat exchanger as claimed in claim 3 wherein the liquid-homogenizing structure is a casting comprising:
a cylinder provided with a plurality of liquid inlet holes and a plurality of liquid outlet holes, wherein the plurality of liquid inlet holes are arranged below the plurality of liquid outlet holes, the liquid inlet holes are connected with the second end of the first heat exchange tube group, and the liquid outlet holes are connected with the second end of the second heat exchange tube group;
the liquid inlet hole is communicated with the liquid outlet hole through a bending cavity.
7. A dry heat exchanger according to claim 6,
the ratio of the number of the liquid inlet holes to the number of the liquid outlet holes is 1: n, the ratio of the number of the liquid inlet ends of the bending cavity to the number of the liquid outlet ends of the bending cavity is also 1: n, wherein n is greater than 0.
8. A dry heat exchanger according to claim 6,
the periphery of the liquid outlet hole is provided with a tapered port, and the tapered port is connected with the second end of the second heat exchange tube group so as to improve the flow rate of the refrigerant.
9. A dry heat exchanger according to claim 6,
the area of the tube plate corresponding to the liquid equalizing cavity is provided with a plurality of through holes, the second end of the first heat exchange tube group and the second end of the second heat exchange tube group penetrate through the through holes, and the sum of the number of liquid inlet holes and the number of liquid outlet holes on the column body is equal to the number of the through holes.
10. An air conditioning assembly comprising a dry heat exchanger according to any one of claims 1 to 9.
CN202210333069.0A 2022-03-31 2022-03-31 Dry heat exchanger and air conditioning unit Pending CN114812226A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210333069.0A CN114812226A (en) 2022-03-31 2022-03-31 Dry heat exchanger and air conditioning unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210333069.0A CN114812226A (en) 2022-03-31 2022-03-31 Dry heat exchanger and air conditioning unit

Publications (1)

Publication Number Publication Date
CN114812226A true CN114812226A (en) 2022-07-29

Family

ID=82533655

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210333069.0A Pending CN114812226A (en) 2022-03-31 2022-03-31 Dry heat exchanger and air conditioning unit

Country Status (1)

Country Link
CN (1) CN114812226A (en)

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