CN215063893U - Coiled tube type heat exchanger and refrigerating system - Google Patents

Abstract

The utility model relates to a refrigeration technology field especially relates to around tubular heat exchanger and refrigerating system. A wound tube type heat exchanger comprises a barrel assembly, a central tube and heat exchange tubes, 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 heat exchange tubes comprise a plurality of layers of heat exchange tubes, each layer of heat exchange tube comprises a plurality of heat exchange tubes, and the plurality of layers of heat exchange tubes surround the outside of the central tube and are spiral; the heat exchange tube comprises a tube body assembly, wherein a plurality of groups of tube pass interfaces are arranged on the tube body assembly, each layer of heat exchange tube is connected to the tube pass interfaces, and the heat exchange tubes connected to the tube pass interfaces of different groups are alternately arranged. The utility model has the advantages that: even when the refrigeration system only runs partial load, the shell side medium and the tube side medium can still exchange heat uniformly, and the heat exchange efficiency of the wound tube type heat exchanger is improved.

Description

Coiled tube type heat exchanger and refrigerating system

Technical Field

The utility model relates to a refrigeration technology field especially relates to around tubular heat exchanger and refrigerating system.

Background

Some refrigeration systems are made up of multiple systems connected in parallel, with part of the heat exchange tubes in the coiled heat exchanger being connected to one system and part of the heat exchange tubes being connected to another system, and being able to selectively operate only part of the systems when the load changes.

The existing wound tube type heat exchanger is connected with the heat exchange tubes of the same system in a centralized way, when some systems in the refrigerating system run, only part of the heat exchange tubes participate in heat exchange, and shell side media in gaps of the heat exchange tubes which do not participate in heat exchange also do not participate in heat exchange, namely, the heat exchange tubes of part of the systems are not uniformly distributed in the whole shell space and cannot uniformly exchange heat with the media in the shell space, so that the heat exchange efficiency is low, and the performance of the refrigerating system is influenced.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a around tubular heat exchanger, technical scheme is as follows:

a wound tube type heat exchanger comprises a barrel assembly, a central tube and heat exchange tubes, 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 heat exchange tubes comprise a plurality of layers of heat exchange tubes, each layer of heat exchange tube comprises a plurality of heat exchange tubes, and the plurality of layers of heat exchange tubes surround the outside of the central tube and are spiral; the heat exchange tube comprises a tube body assembly, wherein a plurality of groups of tube side interfaces are arranged on the tube body assembly, each layer of heat exchange tube is connected to the tube side interfaces, and the heat exchange tubes connected with the tube side interfaces of different groups are arranged alternately.

So set up, even if when refrigerating system's partial load operation, shell side medium still can the even heat transfer with tube side medium, improves the heat exchange efficiency around tubular heat exchanger.

In one embodiment, each heat exchange tube in the heat exchange tubes of the same layer is connected to the same group of tube pass interfaces, and the heat exchange tube interlayers connected to the tube pass interfaces of different groups are alternately arranged.

So set up, when refrigerating system only moves part load, shell side medium still can carry out the heat transfer with the tube side medium in the heat exchange tube of adjacent layer to improve around tubular heat exchanger's heat exchange efficiency

In one embodiment, the heat exchange tubes of the same layer each include a plurality of groups of heat exchange tubes, and each group of heat exchange tubes of the same layer are respectively connected to a plurality of groups of tube side interfaces.

So set up, equally can make when the partial load operation of refrigerating system, shell side medium still can carry out the heat transfer with the tube side medium among the other group heat exchange tubes in the same layer heat exchange tube to improve around tubular heat exchanger's heat exchange efficiency.

In one embodiment, each set of tube side interfaces includes a tube side inlet and a tube side outlet, and the tube side outlets of at least two sets of tube side interfaces are respectively disposed near two ends of the coiled tube heat exchanger.

So set up, can shorten the length of the connecting line between tube side export and the compressor, save the cost to improve refrigerating system's performance.

In one embodiment, the cartridge assembly includes a cartridge, a first cover and a second cover, the first cover and the second cover are respectively disposed at two ends of the cartridge, and the tube-side interface is disposed on the first cover and/or the second cover.

By the arrangement, the flow length of the tube side medium can be increased.

In one embodiment, each group of tube pass interfaces comprises a tube pass inlet and a tube pass outlet, a liquid separating assembly is arranged in the tube pass inlet, and the liquid separating assembly is connected to the inlet of the corresponding heat exchange tube.

So set up, can make the tube side medium distribute each heat exchange tube evenly.

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

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, the spiral directions of the heat exchange tubes of each two adjacent layers are opposite.

By the arrangement, the turbulence of shell side media between the heat exchange tubes can be enhanced, and heat exchange is enhanced.

The utility model discloses still provide following technical scheme:

a refrigeration system comprises the coiled heat exchanger.

Compared with the prior art, the utility model provides a around tubular heat exchanger, through will connecting in different groups every layer of tube side interface the heat exchange tube sets up in turn each other, and every layer the heat exchange tube is connected the tube side interface for when refrigerating system part load operation, shell side medium still can with adjacent layer heat exchange tube or the tube side medium heat transfer in the heat exchange tube of one deck, strengthen the homogeneity of shell side medium and tube side medium's heat transfer, improve around tubular heat exchanger's performance.

Drawings

FIG. 1 is a partial cross-sectional view of a coiled heat exchanger according to 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 interface; 171. a tube side inlet; 172. a tube side outlet; 20. a central barrel; 30. a heat exchange pipe; 40. a liquid separating component; 41. a dispenser.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to 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 invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. 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 fig. 2, the present invention provides a coiled heat exchanger 100, in which the coiled heat exchanger 100 is installed in a refrigeration system for heat exchange.

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 outside of the central tube 20, the central tube 20 and the heat exchange tubes 30 are disposed in the shell cavity 11, the heat exchange tubes 30 include multiple layers of heat exchange tubes 30, each layer of heat exchange tubes 30 includes multiple heat exchange tubes 30, and the multiple heat exchange tubes 30 in the same layer are surrounded to form a tube 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 first end 101, the second shell-side connecting tube 13 is arranged close to the second end 102, 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 second shell-side connecting tube 13 and 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 first sealing cover 15 and the second sealing cover 16, respectively.

The barrel component 10 is provided with a plurality of groups of tube pass interfaces 17, each group of tube pass interfaces 17 comprises a tube pass inlet 171 and a tube pass outlet 172, each layer of heat exchange tubes 30 is connected to the tube pass interfaces 17, and each layer of heat exchange tubes 30 connected to the tube pass interfaces 17 of different groups are alternately arranged. For example, if there are two sets of tube pass interfaces 17, the first set of tube pass interfaces 17 are respectively connected to the first layer of heat exchange tubes 30 and the third layer of heat exchange tubes 30, and the second set of tube pass interfaces 17 are respectively connected to the second layer of heat exchange tubes 30 and the fourth layer of heat exchange tubes 30; if the tube pass interfaces 17 are four groups, the first group of tube pass interfaces 17 are respectively connected to the first layer of heat exchange tube 30 and the fifth layer of heat exchange tube 30, the second group of tube pass interfaces 17 are respectively connected to the second layer of heat exchange tube 30 and the sixth layer of heat exchange tube 30, the third group of tube pass interfaces 17 are respectively connected to the third layer of heat exchange tube 30 and the seventh layer of heat exchange tube 30, and the fourth group of tube pass interfaces 17 are respectively connected to the fourth layer of heat exchange tube 30 and the eighth layer of heat exchange tube 30.

It can be understood that when the refrigeration system is formed by connecting a plurality of systems in parallel, the tube pass outlets 172 in the plurality of sets of tube pass interfaces 17 are connected to different compressors, and when the refrigeration system is in partial load operation, that is, when some of the systems are not in operation, the corresponding compressor is shut down and does not operate, and the shell pass medium can still exchange heat with the tube pass medium in the heat exchange tube 30 in the adjacent layer or the other heat exchange tubes 30 in the same layer, so as to improve the heat exchange efficiency of the coiled tube heat exchanger 100. For example, if the tube side interfaces 17 are two groups, if the system connected to the first group of tube side interfaces 17 does not operate, and the second group of tube side interfaces 17 operates, the tube side medium in the first layer of heat exchange tubes 30 does not participate in heat exchange, the shell side medium between the first layer of heat exchange tubes 30 and the second layer of heat exchange tubes 30 can still exchange heat with the tube side medium in the second layer of heat exchange tubes 30, or exchange heat with the tube side medium in other heat exchange tubes 30 in the first layer of heat exchange tubes 30, and the heat exchange efficiency of the coiled tube heat exchanger 100 can be improved.

In one embodiment, each heat exchange tube 30 in the same layer of heat exchange tubes 30 is connected to the same group of tube pass interfaces 17, for example, if the tube pass interfaces 17 are two groups, the first group of tube pass interfaces 17 is respectively connected to all the heat exchange tubes 30 in the first layer of heat exchange tubes 30, all the heat exchange tubes 30 in the third layer of heat exchange tubes 30, and all the heat exchange tubes 30 in the fifth layer of heat exchange tubes 30, and the second group of tube pass interfaces 17 is respectively connected to all the heat exchange tubes 30 in the second layer of heat exchange tubes 30, all the heat exchange tubes 30 in the fourth layer of heat exchange tubes 30, and all the heat exchange tubes 30 in the sixth layer of heat exchange tubes 30.

In another embodiment, the heat exchange tubes 30 in the same layer each include a plurality of sets of heat exchange tubes 30, each set of heat exchange tubes 30 in the same layer is connected to a plurality of sets of tube pass interfaces 17, the outlets of one set of heat exchange tubes 30 in the same layer are connected to the tube pass outlets 172 in one set of tube pass interfaces 17, the inlets of the heat exchange tubes 30 in the same group are connected to the tube pass inlets 171 in the tube pass interfaces 17 in the same group, and the outlets of the other set of heat exchange tubes 30 are connected to the tube pass outlets 172 in the other set of tube pass interfaces 17, that is, the tube pass media in the heat exchange tubes 30 in the same layer are uniformly distributed to the tube pass interfaces 17 in each set. For example, if there are two sets of tube side interfaces 17, inlets of a first set of heat exchange tubes 30 of the first layer of heat exchange tubes 30 are connected to the tube side inlets 171 of the first set, inlets of a second set of heat exchange tubes 30 of the first layer of heat exchange tubes 30 are connected to the tube side inlets 171 of the second set, inlets of the first set of heat exchange tubes 30 of the second layer of heat exchange tubes 30 are connected to the tube side inlets 171 of the first set, and inlets of the second set of heat exchange tubes 30 of the second layer of heat exchange tubes 30 are connected to the tube side inlets 171 of the second set.

The tube-side outlets 172 of at least two sets of tube-side interfaces 17 are disposed near two ends of the coiled heat exchanger 100, respectively. It can be understood that when the refrigeration system is a multi-system, the number of the compressors is multiple, and the multiple compressors are distributed at two ends of the coiled heat exchanger 100, so that the connecting pipeline between the tube pass outlet 172 and the compressors can be shortened, the cost can be reduced, and the performance of the refrigeration system can be improved.

The tube-side outlet 172 and the tube-side inlet 171 of the tube-side interfaces 17 of the same group are respectively disposed near both ends of the coiled heat exchanger 100.

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, 1.5mm, 2mm, 2.5mm, 3mm, 4mm or 1 mm-4 mm. It should be noted that, in this embodiment, the tube-side medium may be a refrigerant, and the shell-side medium may be water, and according to the different properties of the media, a suitable medium is selected to pass through the tube side, and another medium passes through the shell side.

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.

A liquid separating assembly 40 is arranged in the tube pass inlet 171, 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 this embodiment, a gas collecting assembly (not shown) is disposed in the tube side outlet 172, the gas collecting assembly is connected to the outlet of the corresponding heat exchange tube 30, and the gas collecting assembly is configured to collect the tube side medium flowing out of each heat exchange tube 30 and flow into the pipeline of the refrigeration system. In other embodiments, a gas collection assembly may not be provided.

In this embodiment, the liquid separating assembly 40 includes a distributor 41, the gas collecting assembly includes a gas collecting head, a plurality of distribution holes (not shown) are respectively formed on the distributor 41 and the gas collecting head, an inlet of the heat exchanging pipe 30 is welded at the distribution hole of the distributor 41 of the corresponding group, and an outlet of the heat exchanging pipe 30 is welded at the distribution hole of the gas collecting head of the corresponding group. In other embodiments, the liquid separating assembly 40 and the gas collecting head may also be a first tube plate and a second tube plate, the first tube plate is disposed in the tube pass inlet 171 and has a plurality of first fixing holes, the second tube plate is disposed in the tube pass outlet 172 and has a plurality of second fixing holes, the inlet of the heat exchange tube 30 is expanded in the first fixing hole of the first tube plate of the corresponding group, and the outlet of the heat exchange tube 30 is expanded in the second fixing hole of the second tube plate of the corresponding group.

The utility model also provides a refrigerating system, including above-mentioned around tubular heat exchanger 100.

In the working process, media simultaneously enter from each group of tube pass inlets 171, are subjected to liquid separation through the liquid separation assembly 40, uniformly enter the heat exchange tubes 30 of the corresponding layer, exchange heat with the shell pass media, flow to the other end of the tubular heat exchanger 100 and flow out from the tube pass outlet 172; 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 represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should 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 heat exchange tubes (30), wherein a shell cavity (11) for accommodating shell side media is formed in the tube body assembly (10), the central tube (20) is arranged in the shell cavity (11), each heat exchange tube (30) comprises a plurality of layers of heat exchange tubes (30), each layer of heat exchange tube (30) comprises a plurality of heat exchange tubes (30), and the plurality of layers of heat exchange tubes (30) surround the central tube (20) and are spiral;

the heat exchange tube assembly is characterized in that a plurality of groups of tube pass interfaces (17) are arranged on the barrel assembly (10), each layer of heat exchange tubes (30) are connected to the tube pass interfaces (17), and the heat exchange tubes (30) connected with the different groups of tube pass interfaces (17) are alternately arranged.

2. The coiled heat exchanger according to claim 1, wherein each of the heat exchange tubes (30) of the same layer is connected to the same group of the tube side interfaces (17), and the heat exchange tubes (30) connected to different groups of the tube side interfaces (17) are arranged alternately in layers.

3. The wound tube heat exchanger according to claim 1, wherein the heat exchange tubes (30) of the same layer each comprise a plurality of groups of heat exchange tubes (30), and each group of the heat exchange tubes (30) of the same layer is connected to the tube side interface (17) of the corresponding group, respectively.

4. The coiled heat exchanger according to claim 1, wherein each set of tube-side interfaces (17) comprises a tube-side inlet (171) and a tube-side outlet (172), and the tube-side outlets (172) of at least two sets of tube-side interfaces (17) are respectively disposed at two ends of the coiled heat exchanger.

5. The coiled heat exchanger according to claim 1, wherein the cylinder assembly (10) comprises a cylinder (14), a first cover (15) and a second cover (16), the first cover (15) and the second cover (16) are respectively arranged at two ends of the cylinder (14), and the tube-side interface (17) is arranged on the first cover (15) and/or the second cover (16).

6. The coiled heat exchanger according to claim 1, wherein each set of tube side interfaces (17) comprises a tube side inlet (171) and a tube side outlet (172), a liquid separating assembly (40) is arranged in the tube side inlet (171), and the liquid separating assembly (40) is connected to the inlet of the corresponding heat exchange tube (30).

7. The coiled tube heat exchanger according to claim 6, wherein the liquid distribution assembly (40) comprises a first tube plate, the first tube plate is arranged in the tube side inlet (171) and provided with a plurality of first fixing holes, and the inlet of the heat exchange tube (30) is expanded and connected in the corresponding first fixing hole.

8. The coiled heat exchanger according to claim 6, wherein the liquid distribution assembly (40) comprises a distributor (41), the distributor (41) is provided with a plurality of distribution holes, and inlets of the heat exchange tubes (30) are respectively connected with the corresponding distribution holes in a welding manner.

9. A wound tube heat exchanger according to claim 1 wherein the heat exchange tubes (30) of each adjacent two layers have opposite helical directions.

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

Images