CN215984090U - Coiled tube type heat exchanger and refrigerating system - Google Patents

Abstract

The utility model relates to the technical field of refrigeration, in particular to a wound tube type heat exchanger and a refrigeration system. A wound tube type heat exchanger comprises a barrel assembly, a central tube and a heat exchange tube, wherein a shell cavity for accommodating shell pass media is formed in the barrel assembly, the central tube is arranged in the shell cavity, the central tube spirally surrounds a plurality of layers of heat exchange tubes, the wound tube type heat exchanger comprises a first end and a second end which are arranged oppositely, a tube pass outlet and a tube pass inlet are formed in the barrel assembly, and two ends of the heat exchange tube are respectively connected to the tube pass inlet and the tube pass outlet; the tube side inlet and the tube side outlet are both arranged at the first end, the heat exchange tube comprises a plurality of sections of connecting tubes which are connected in sequence, and at least two sections of the connecting tubes are different in pipe diameter. The utility model has the advantages that: the pressure loss of the tube side medium in the flowing process can be reduced, the problem that the saturation temperature is reduced too much is solved, and the performance of the tube-wound heat exchanger is improved.

Description

Coiled tube type heat exchanger and refrigerating system

Technical Field

The utility model relates to the technical field of refrigeration, in particular to a wound tube type heat exchanger and a refrigeration system.

Background

The winding tube type heat exchanger is arranged in the refrigerating system and used for heat exchange, and the plurality of heat exchange tubes are spirally wound outside the central cylinder, so that the heat exchanger has the characteristics of compact design, small occupied area and good heat exchange effect.

When the conventional coiled tube heat exchanger is used as an evaporator, the pipe diameters of the whole sections from the inlet to the outlet of the heat exchange tube are the same, the dryness of a tube side medium is increased in the evaporation process, namely the volume of a gaseous refrigerant is increased, the flow speed is increased, and the pressure drop is reduced more due to the fact that the fluid speed at the rear end of the coiled tube heat exchanger is too high, so that the saturation temperature is reduced too much, and the performance of the coiled tube heat exchanger is influenced; similarly, when the coiled tube heat exchanger is used as a condenser, the dryness of the tube-side medium is getting smaller and smaller during condensation, and the flow rate of the front-end gaseous refrigerant is too high, which also causes a large pressure drop and affects the performance of the heat exchanger.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a coiled tube type heat exchanger, which adopts the following technical scheme:

a wound tube type heat exchanger comprises a barrel assembly, a center tube and a heat exchange tube, wherein a shell cavity for containing shell pass media is formed in the barrel assembly, the center tube is arranged in the shell cavity, the center tube spirally surrounds a plurality of layers of heat exchange tubes, the heat exchange tube is used for containing the shell pass media, the wound tube type heat exchanger comprises a first end and a second end which are oppositely arranged, a tube pass outlet and a tube pass inlet are formed in the barrel assembly, and two ends of the heat exchange tube are respectively connected to the tube pass inlet and the tube pass outlet; the tube side inlet and the tube side outlet are both arranged at the first end, the heat exchange tube comprises a plurality of sections of connecting tubes which are connected in sequence, and at least two sections of the connecting tubes are different in pipe diameter.

By the arrangement, when the dryness of the tube pass medium changes, the flow velocity of the tube pass medium at the position with larger dryness can be reduced, and overlarge pressure drop caused by overlarge flow velocity of the tube pass medium is prevented, so that the saturation temperature of the tube pass medium is reduced overlarge, and the performance of the coiled tube heat exchanger is improved; and the inlet and outlet of the tube pass medium are arranged at the same end so as to be matched with the original structure of a refrigeration system manufacturer, and the installation is convenient.

In one embodiment, the heat exchange tube further comprises a capillary tube, and the connecting tube comprises a first tube side segment and a second tube side segment, each extending from the first end to the second end and communicating at the second end through the capillary tube.

So set up, simple structure.

In one embodiment, the first and second tube lengths have different tube diameters.

In one embodiment, one end of the first tube pass section is communicated with the tube pass inlet, and when the wound tube heat exchanger is an evaporator, the tube diameter of the first tube pass section is smaller than that of the second tube pass section; one end of the first tube pass section is communicated with the tube pass inlet, and when the wound tube heat exchanger is a condenser, the tube diameter of the first tube pass section is larger than that of the second tube pass section.

It will be appreciated that when the coiled tube heat exchanger is used as an evaporator, the closer to the tube side outlet, the greater the dryness of the tube side media; and when the coiled tube heat exchanger is used as a condenser, the closer to the tube side inlet, the higher the dryness of the tube side medium.

In one embodiment, a liquid separating component is arranged in the tube pass inlet and is connected to the inlet of the heat exchange tube.

So set up, can distribute the tube side medium to each heat exchange tube uniformly.

In one embodiment, the liquid separation assembly comprises a tube plate, the tube plate is arranged in the tube side inlet and is provided with a plurality of fixing holes, and the inlet of the heat exchange tube is expanded and connected in the fixing holes.

In one embodiment, the liquid separating assembly comprises a distributor, the distributor is provided with a plurality of distribution holes, and inlets of the heat exchange tubes are respectively connected with the distribution holes in a welding manner.

In one embodiment, a gas collection assembly is arranged in the tube side outlet and connected to the outlet of the heat exchange tube.

So set up, collect to the tube side medium.

In one embodiment, the heat exchange tubes of adjacent layers are spaced apart from each other.

So set up for shell side medium gets into in the clearance and carries out abundant heat transfer with the tube side medium.

A refrigeration system comprises the coiled heat exchanger.

Compared with the prior art, the pipe-wound heat exchanger provided by the utility model has the advantages that the pipe pass inlet and the pipe pass outlet are arranged at the same end to adapt to the original structure of a refrigerating system entering and exiting from the same end, and the pipe diameters of at least two sections of connecting pipes in the connecting pipes sequentially connected in the heat exchange pipe are arranged to be different to adapt to the change of the dryness of a pipe pass medium, so that the pressure loss of the pipe pass medium in the flowing process is reduced, the problem of excessive reduction of the saturation temperature of the pipe pass medium is solved, and the performance of the pipe-wound heat exchanger is improved.

Drawings

FIG. 1 is a perspective view of a coiled heat exchanger provided by the present invention;

fig. 2 is a schematic structural view of the central cylinder and the heat exchange tube.

The symbols in the drawings represent the following meanings:

100. a coiled heat exchanger; 101. a first end; 102. a second end; 10. a cartridge assembly; 11. a shell cavity; 12. a first shell-side adapter tube; 13. a second shell side connection pipe; 14. a barrel; 15. a first cover; 16. a second cover; 17. a tube side inlet; 18. a tube side outlet; 20. a central barrel; 30. a heat exchange pipe; 31. a connecting pipe; 32. a first tube pass section; 33. a second tube pass section; 34. a capillary tube; 40. a liquid separating component; 41. a dispenser; 411. a dispensing aperture; 50. a gas collection assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, the present invention provides a wound tube heat exchanger 100, wherein the wound tube heat exchanger 100 is installed in a refrigeration system for exchanging heat.

Specifically, referring to fig. 1, the wound tube heat exchanger 100 includes a tube assembly 10, a central tube 20 and heat exchange tubes 30, the tube assembly 10 has a shell cavity 11 therein, the heat exchange tubes 30 spirally and hierarchically surround the outer side of the central tube 20, and the central tube 20 and the heat exchange tubes 30 are disposed in the shell cavity 11.

Each layer of heat exchange tube 30 comprises a plurality of heat exchange tubes 30, and the plurality of heat exchange tubes 30 are surrounded in a cylindrical shape.

Specifically, the barrel assembly 10 includes a barrel 14, a first cover 15 and a second cover 16, the first cover 15 and the second cover 16 are respectively disposed at two ends of the barrel 14, and the first cover 15, the second cover 16 and the barrel 14 enclose a shell cavity 11.

The coiled tube heat exchanger 100 is provided with a first end 101 and a second end 102 which are arranged oppositely, a first shell-side connecting tube 12 and a second shell-side connecting tube 13 are arranged on the cylinder assembly 10, the first shell-side connecting tube 12 and the second shell-side connecting tube 13 are both communicated with the shell cavity 11, the first shell-side connecting tube 12 is arranged close to the second end 102, the second shell-side connecting tube 13 is arranged close to the first end 101, a shell-side medium flows into the shell cavity 11 from the first shell-side connecting tube 12 and flows out of the second shell-side connecting tube 13 after exchanging heat with a tube-side medium in the heat exchange tube 30, or the shell-side medium flows into the shell cavity 11 from the second shell-side connecting tube 13 and then flows out of the first shell-side connecting tube 12.

In this embodiment, the first shell-side connection pipe 12 and the second shell-side connection pipe 13 are both disposed on the cylinder 14, and in other embodiments, the first shell-side connection pipe 12 and the second shell-side connection pipe 13 may also be disposed on the second cover 16 and the first cover 15, respectively. In other embodiments, a suitable medium is selected to pass through the tube side and another medium passes through the shell side according to different properties of the media.

The cylinder assembly 10 is provided with a tube pass inlet 17 and a tube pass outlet 18 for circulating a tube pass medium, the tube pass inlet 17 and the tube pass outlet 18 can be opened on the first sealing cover 15 or the cylinder 14, and the tube pass inlet 17 and the tube pass outlet 18 are located at the same end so as to be suitable for a unit with the tube pass medium entering and exiting from the same end.

A liquid separating assembly 40 is arranged in the tube pass inlet 17, the liquid separating assembly 40 is connected with the inlet of the corresponding heat exchange tube 30, and the liquid separating assembly 40 is used for uniformly distributing the tube pass medium to each heat exchange tube 30.

In the present embodiment, a gas collecting assembly 50 is disposed in the tube side outlet 18, the gas collecting assembly 50 is connected to the outlet of the corresponding heat exchange tube 30, and the gas collecting assembly 50 is used for collecting the tube side medium flowing out of each heat exchange tube 30 and flowing into the pipeline of the refrigeration system. In other embodiments, the gas collection assembly 50 may not be provided.

In this embodiment, each of the liquid separating assembly 40 and the gas collecting assembly 50 includes a distributor 41, the distributor 41 is provided with a plurality of distribution holes 411, inlets of the heat exchange tubes 30 are welded to the distribution holes 411, and outlets of the heat exchange tubes 30 are welded to the distribution holes 411 of the gas collecting head.

In other embodiments, the liquid separating assembly 40 and the gas collecting assembly 50 may further include a tube plate (not shown) disposed in the tube side inlet 17 and the tube side outlet 18, the tube plate being provided with fixing holes (not shown), and the inlet of the heat exchanging tube 30 is expanded into the fixing holes of the tube plate. In other embodiments, the liquid-separating assembly 40 may be a liquid-separating head or other distributor 41, the gas-collecting assembly 50 may be a tube plate, or the gas-collecting assembly 50 may not be disposed in the tube-side outlet 18.

The heat exchange tube 30 includes a plurality of sections of connecting tubes 31 connected in sequence, and at least two sections of the connecting tubes 31 in the plurality of sections of connecting tubes 31 have different tube diameters. It can be understood that, in this embodiment, the tube-side medium is a refrigerant, and when the coiled heat exchanger 100 is used as an evaporator, the dryness of the refrigerant gradually increases in the process of heat absorption and evaporation of the refrigerant in the heat exchange tubes 30, that is, the gaseous refrigerant in the refrigerant is more and more, the tube diameters of at least two sections of heat exchange tubes 30 are set to be different, so that the refrigerant with more gaseous refrigerant components can flow in the connecting tube 31 with a larger tube diameter, and thus the flow velocity of the refrigerant in the heat exchange tubes 30 is more uniform, and the refrigerant with more gaseous components is prevented from flowing in the connecting tube 31 with a smaller tube diameter and flowing at an excessively high velocity, which results in an excessively large pressure drop, thereby preventing the saturation temperature from being excessively reduced, and improving the performance of the coiled heat exchanger 100; similarly, when the coiled heat exchanger 100 is used as a condenser, the refrigerant releases heat and condenses in the heat exchange tubes 30, the dryness is gradually reduced, and the diameters of at least two sections of heat exchange tubes 30 are set to be different, so that the refrigerant with more gaseous refrigerant components can flow in the connecting tube 31 with larger diameter, and the influence on the performance of the coiled heat exchanger 100 due to overlarge pressure drop is avoided.

Preferably, the heat exchange tube 30 further comprises a capillary tube 34, the connecting tube 31 is two segments, the two connecting tubes 31 are a first tube side segment 32 and a second tube side segment 33, the first tube side segment 32 and the second tube side segment 33 both extend from the first end 101 to the second end 102, the liquid separating component 40 is connected to the inlet of the first tube side segment 32, the gas collecting component 50 is connected to the outlet of the second tube side segment 33, and the first tube side segment 32 and the second tube side segment 33 are connected at the second end 102 through the capillary tube 34.

In one embodiment, when the coiled heat exchanger 100 is used as an evaporator, the pipe diameter of the connecting pipe 31 near the tube-side outlet 18 of the multi-stage connecting pipes 31 is larger than the pipe diameter of the connecting pipe 31 near the tube-side inlet 17 along the flow direction of the tube-side medium, i.e., the pipe diameter of the second tube-side stage 33 is larger than the pipe diameter of the first tube-side stage 32. It will be appreciated that in this embodiment, the coiled heat exchanger 100 acts as an evaporator, with the quality of the refrigerant increasing closer to the tube-side inlet 17.

In another embodiment, when the coiled heat exchanger 100 is used as a condenser, the pipe diameter of the connecting pipe 31 near the tube-side outlet 18 of the multi-stage connecting pipes 31 is smaller than the pipe diameter of the connecting pipe 31 near the tube-side inlet 17 along the flow direction of the tube-side medium, i.e., the pipe diameter of the second tube-side stage 33 is smaller than the pipe diameter of the first tube-side stage 32. It will be appreciated that in this embodiment, the coiled heat exchanger 100 acts as a condenser, with the quality of the refrigerant being less the closer to the tube-side inlet 17.

Each heat exchange pipe 30 has the same structure to reduce the complexity of the process.

The heat exchange tubes 30 of adjacent layers are arranged at intervals, the gaps between the heat exchange tubes 30 of adjacent layers are 1 mm-4 mm along the radial direction of the central cylinder 20, and the gaps between the adjacent layers are used for allowing a shell side medium to flow, so that the tube side medium and the shell side medium can exchange heat fully. It can be understood that if the gaps of the heat exchange tubes 30 in the adjacent layers are too small, the shell-side medium cannot flow, or the flow velocity of the shell-side medium is too fast to increase the flow resistance, and if the gaps of the heat exchange tubes 30 in the adjacent layers are too large, the flow velocity of the shell-side medium is reduced, which affects the heat exchange coefficient. The gap between the adjacent heat exchange tubes 30 can be any value of 1mm, 1.2mm, 1.8mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm or 1 mm-4 mm.

Further, the spiral directions of the adjacent heat exchange tubes 30 are opposite, so that the turbulence degree of shell-side media among the heat exchange tubes 30 can be enhanced, the heat exchange is enhanced, and the heat exchange efficiency is improved.

A wrapping cylinder (not shown) is arranged between the outermost heat exchange tube 30 and the inner wall of the cylinder 14, the wrapping cylinder is wound outside the outermost heat exchange tube 30 and is fixed on the inner wall of the cylinder 14, the wrapping cylinder plays a role in guiding flow, and shell pass media are prevented from directly flowing to the other end of the cylinder 14 from the position between the outermost heat exchange tube 30 and the inner wall of the shell cavity 11, so that the heat exchange effect is influenced, friction between the inner wall of the cylinder 14 and the heat exchange tube 30 is prevented, and the heat exchange tube 30 is prevented from being broken by friction to generate leakage.

The inner wall of the heat exchange tube 30 is provided with threads (not shown) to increase the heat exchange area of the heat exchange tube 30.

The heat exchange tubes 30 on the same layer are arranged at intervals, so that a shell-side medium can enter the gaps of the heat exchange tubes 30 to exchange heat with the tube-side medium.

The present invention also provides a refrigeration system comprising the above-described coiled heat exchanger 100.

The operation of the coiled heat exchanger 100 as an evaporator will be described. The medium enters from the tube pass inlets 17 of all groups at the same time, is subjected to liquid separation through the liquid separation component 40, uniformly enters the heat exchange tubes 30 of the corresponding layers, enters the connecting tubes 31 with smaller tube diameters firstly, enters the connecting tubes 31 with larger tube diameters again to flow back when the volume of the tube pass medium is increased, and flows out from the tube pass outlets 18; the shell-side medium flows in from the first shell-side connecting pipe 12, flows into the shell cavity 11, flows into the gaps of the heat exchange pipes 30 of each layer, exchanges heat with the tube-side medium, and flows out from the second shell-side connecting pipe 13.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A wound tube type heat exchanger comprises a tube body assembly (10), a central tube (20) and a heat exchange tube (30), wherein a shell cavity (11) for containing shell side media is formed in the tube body assembly (10), the central tube (20) is arranged in the shell cavity (11), the central tube (20) spirally surrounds a plurality of layers of heat exchange tubes (30), the heat exchange tubes (30) are used for containing the tube side media, the wound tube type heat exchanger comprises a first end (101) and a second end (102) which are oppositely arranged, a tube side outlet (18) and a tube side inlet (17) are formed in the tube body assembly (10), and two ends of the heat exchange tube (30) are respectively connected to the tube side inlet (17) and the tube side outlet (18);

the heat exchange tube is characterized in that the tube side inlet (17) and the tube side outlet (18) are arranged at the first end (101), the heat exchange tube (30) comprises a plurality of sections of connecting tubes (31) which are sequentially connected, and at least two sections of the connecting tubes (31) in the connecting tubes (31) are different in tube diameter.

2. The coiled heat exchanger according to claim 1, wherein the heat exchange tube (30) further comprises a capillary tube (34), the connection tube (31) comprising a first tube side section (32) and a second tube side section (33), the first tube side section (32) and the second tube side section (33) each extending from the first end (101) to the second end (102) and communicating at the second end (102) through the capillary tube (34).

3. The coiled heat exchanger according to claim 2, wherein the first tube side section (32) and the second tube side section (33) have different tube diameters.

4. The coiled heat exchanger according to claim 2, wherein one end of the first tube side section (32) is in communication with the tube side inlet (17), and when the coiled heat exchanger is an evaporator, the tube diameter of the first tube side section (32) is smaller than the tube diameter of the second tube side section (33); one end of the first tube pass section (32) is communicated with the tube pass inlet (17), and when the wound tube type heat exchanger is a condenser, the tube diameter of the first tube pass section (32) is larger than that of the second tube pass section (33).

5. The coiled heat exchanger according to claim 1, wherein a liquid separating assembly (40) is arranged in the tube side inlet (17), and the liquid separating assembly (40) is connected to the inlet of the heat exchange tube (30).

6. The coiled tube heat exchanger according to claim 5, wherein the liquid distribution assembly (40) comprises a tube plate, the tube plate is arranged in the tube side inlet (17) and provided with a plurality of fixing holes, and the inlet of the heat exchange tube (30) is expanded and connected in the fixing holes.

7. The coiled heat exchanger according to claim 5, wherein the liquid distribution assembly (40) comprises a distributor (41), a plurality of distribution holes (411) are formed in the distributor (41), and inlets of the heat exchange tubes (30) are respectively connected with the distribution holes (411) in a welding manner.

8. The coiled heat exchanger according to claim 1, wherein a gas collection assembly (50) is disposed in the tube side outlet (18), and the gas collection assembly (50) is connected to the outlet of the heat exchange tube (30).

9. The coiled heat exchanger according to claim 1, wherein the heat exchange tubes (30) of adjacent layers are spaced apart from each other.

10. A refrigeration system comprising a coiled heat exchanger according to any of claims 1 to 9.

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