Multi-stage liquid distribution automatic uniform adjusting device of falling film heat exchanger

Abstract

The utility model belongs to the technical field of heat exchangers, and discloses a multistage liquid distribution automatic uniform adjusting device of a falling film heat exchanger, which comprises a support, a tank body is fixedly arranged on the support, a liquid distribution adjusting device is arranged on the inner wall of one side in the tank body, and the liquid distribution adjusting device penetrates through the inner wall of the tank body. A first heat exchange tube set, a second heat exchange tube set and a third heat exchange tube set are sequentially arranged in the tank body and located below the liquid distribution adjusting device, and two liquid blocking plates which are arranged at intervals are fixedly installed in the tank body and located between the second heat exchange tube set and the third heat exchange tube set. The liquid distributor is simple in overall structure, the problem of uneven liquid distribution is effectively reduced, the problem of liquid carrying in air suction is reduced, and the using effect is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and in particular relates to a multi-stage liquid distribution automatic uniformity regulating device for a falling film heat exchanger. Background Art

[0002] With the development of magnetic levitation centrifugal compressors, magnetic levitation technology is replacing traditional centrifugal compressors. Magnetic levitation centrifugal refrigerant compressors are becoming increasingly mature, and magnetic levitation chillers are also undergoing a new industrial revolution. With the application of compressors, more problems require specialized technologies and equipment to optimize. High-efficiency falling-film heat exchangers face the problems of liquid carryover and uneven heat transfer. Liquid carryover during operation of magnetic levitation compressors (units) is characterized by significant fluctuations in refrigerant vapor flow and increased power consumption.

[0003] Falling film heat exchangers are currently widely used in magnetic levitation water-cooled chillers, effectively adapting to screw compressors, which are less sensitive to liquid carryover. For magnetic levitation chillers, achieving higher energy efficiency requires more stable and reliable operating conditions. Therefore, effectively reducing liquid carryover in applications, minimizing compressor power fluctuations, and thereby improving the chiller's energy efficiency and reliability, is crucial.

[0004] Traditional liquid distributor designs often utilize a single structure or simple flow splitting method, making them difficult to adapt to the challenges posed by fluctuating refrigerant flow rates. Especially when refrigerant flow fluctuates significantly, traditional liquid distributors often fail to maintain stable liquid distribution uniformity, thus affecting the overall performance of the heat exchanger.

[0005] A Chinese patent with application number CN202223441824.1 discloses a falling film heat exchanger and a magnetic levitation chiller, which belongs to the field of heat exchanger technology. The falling film heat exchanger includes a tank body and a liquid distribution device. A plurality of heat exchange tubes are arranged in the tank body. The liquid distribution device is arranged in the tank body and above the heat exchange tubes; the liquid distribution device includes a first liquid distribution cavity and a second liquid distribution cavity, and the first liquid distribution cavity and the second liquid distribution cavity are arranged along the height direction of the tank body; one end of the liquid inlet pipe located in the tank body is inserted into the first liquid distribution cavity. In the cavity, a first liquid distribution plate is arranged at the bottom of the first liquid distribution cavity, and a plurality of first liquid distribution holes are arranged on the first liquid distribution plate, and the first liquid distribution holes connect the first liquid distribution cavity with the second liquid distribution cavity; a second liquid distribution plate is arranged at the bottom of the second liquid distribution cavity, and a plurality of second liquid distribution holes are arranged on the second liquid distribution plate, and the second liquid distribution holes connect the second liquid distribution cavity with the interior of the tank body; the falling film heat exchanger disclosed above can better realize the liquid film distribution of the liquid refrigerant on the surface of the heat exchange tube, so that the liquid refrigerant has a better gasification effect and improves the heat exchange capacity.

[0006] However, in this utility model, the liquid refrigerant forms a liquid film on the surface of the heat exchange tube. When the refrigerant absorbs heat and vaporizes and is discharged from the outlet pipe, liquid is carried over, which affects the power fluctuation of the compressor. Summary of the Invention

[0007] The main technical problem to be solved by the present utility model is to propose a multi-stage liquid distribution automatic uniform adjustment device for a falling film heat exchanger to realize the automatic adjustment of refrigerant liquid distribution. Through this adjustment device, combined with the existing liquid distributor, the problem of uneven liquid distribution is effectively reduced, the influence of suction liquid hammer is fundamentally changed, the reliability of the refrigerant compressor is improved, and the performance of the unit is improved to a certain extent.

[0008] To solve the above technical problems, the present utility model provides the following technical solutions:

[0009] A multi-stage liquid distribution automatic uniform adjustment device for a falling film heat exchanger, including a bracket, on which a tank body is fixedly installed. At one side inner wall position inside the tank body, a liquid distribution adjustment device is provided. The liquid distribution adjustment device penetrates through the inner wall of the tank body. Below the liquid distribution adjustment device inside the tank body, a first heat exchange tube group, a second heat exchange tube group, and a third heat exchange tube group are sequentially arranged. Between the second heat exchange tube group and the third heat exchange tube group inside the tank body, two liquid blocking plates arranged at intervals are fixedly installed.

[0010] The liquid distribution adjustment device includes a liquid distribution main pipe penetrating through the inner wall of the tank body. One end of the liquid distribution main pipe located inside the tank body is communicated with two symmetrically arranged liquid distribution branch pipes. The other end of the liquid distribution branch pipe is fixedly installed with a first-stage liquid distribution cavity assembly, and the two liquid distribution branch pipes simultaneously penetrate through the first-stage liquid distribution cavity assembly.

[0011] The first-stage liquid distribution cavity assembly includes a cavity cover fixedly installed at the other end positions of the two liquid distribution branch pipes. At the other side end of the cavity cover, a first liquid distribution plate is fixedly installed. The length direction of the first liquid distribution plate is arranged along the length direction of the tank body. A plurality of liquid distribution equalizing holes are linearly arranged on the first liquid distribution plate.

[0012] On both sides in the length direction of the first liquid distribution plate, front-end liquid blocking plates are fixedly installed. A plurality of first air holes are linearly arranged on the front-end liquid blocking plates.

[0013] The following is a further optimization of the above technical solution by the present utility model:

[0014] A end cover is provided at one end position of the tank body, and a water inlet and a water outlet are communicated on the end cover.

[0015] Further optimization: An air suction pipe is communicated at a position on the outer wall of the tank body close to the liquid distribution adjustment device.

[0016] Further optimization: On the opposite surfaces of the two front-end liquid blocking plates, at a position below the first liquid distribution plate, the same second-stage liquid distribution plate is fixedly installed. A plurality of spray holes are linearly arranged on the second-stage liquid distribution plate.

[0017] Further optimization: Liquid distributor outlet liquid-blocking plates are vertically arranged on both sides in the length direction of the secondary liquid distribution plate, and a plurality of second air holes are linearly arrayed on the liquid distributor outlet liquid-blocking plates.

[0018] Further optimization: The first heat exchange tube group includes a plurality of first heat exchange tubes fixedly installed in the heat exchange area. The plurality of first heat exchange tubes are arranged staggeredly and are arranged along the length direction of the tank body.

[0019] Further optimization: The second heat exchange tube group includes a plurality of second heat exchange tubes fixedly installed on the inner wall of the tank body and arranged staggeredly and closely. The plurality of second heat exchange tubes are arranged along the length direction of the tank body.

[0020] Further optimization: The third heat exchange tube group includes a plurality of third heat exchange tubes fixedly installed on the inner wall of the tank body at the bottom position of the tank body and arranged staggeredly. A plurality of fourth heat exchange tubes arranged at intervals are fixedly installed on the inner wall of the tank body at the position below the liquid blocking plate.

[0021] Further optimization: The first heat exchange tube group, the second heat exchange tube group, and the third heat exchange tube group are all communicated with the water inlet and the water outlet.

[0022] The utility model adopts the above technical scheme, with ingenious conception and reasonable structure. It can optimize the design of the liquid distribution regulating device in the falling film heat exchanger, realize the automatic and uniform liquid distribution of the refrigerant liquid, ensure the efficiency of the falling film heat exchanger, and better realize the function of the liquid distributor itself.

[0023] By arranging the first air holes on the front-end liquid-blocking plate and the second air holes on the liquid distributor outlet liquid-blocking plate, when the refrigerant liquid absorbs heat and vaporizes into gas on the surface of the heat exchange tube, the gas carrying the liquid is blocked by the liquid distributor outlet liquid-blocking plate and the front-end liquid-blocking plate, and the gas enters the suction pipe from the second air holes and the first air holes, further improving the quality of the refrigerant gas at the inlet of the magnetic levitation compressor.

[0024] At the same time, by adding the second heat exchange tube group at the middle position in the tank body and the third heat exchange tube group and the fourth heat exchange tube group at the bottom position in the tank body, the disturbance of the refrigerant liquid to the refrigerant compressor and the resulting instability are greatly reduced, the reliability of the compressor is improved, and the performance of the unit is improved to a certain extent.

[0025] The following further illustrates the utility model with reference to the drawings and embodiments. Description of the Drawings

[0026] Figure 1 is a schematic diagram of the overall structure in the embodiment of the utility model;

[0027] Figure 2 is a side sectional view of the overall structure in the embodiment of the utility model;

[0028] Figure 3 This is the front view of the liquid distribution adjustment device in the embodiment of the present utility model;

[0029] Figure 4 This is the side sectional view of the liquid distribution adjustment device in the embodiment of the present utility model;

[0030] Figure 5 This is the structural schematic diagram of the position A in the embodiment of the present utility model.

[0031] In the figure: 1 - support; 2 - tank body; 21 - end cover; 22 - water inlet; 23 - water outlet; 24 - suction pipe; 3 - liquid distribution adjustment device; 31 - liquid distribution main pipe; 32 - liquid distribution branch pipe; 33 - primary liquid distribution cavity assembly; 330 - cavity cover; 331 - first liquid distribution plate; 3310 - liquid distribution equalizing holes; 34 - front end liquid blocking plate; 340 - first air hole; 35 - secondary liquid distribution plate; 350 - spray holes; 36 - liquid blocking plate at the liquid distributor outlet; 360 - second air hole; 4 - first heat exchange tube group; 41 - first heat exchange tube; 5 - second heat exchange tube group; 51 - second heat exchange tube; 6 - third heat exchange tube group; 61 - third heat exchange tube; 62 - fourth heat exchange tube; 7 - liquid blocking plate. Specific implementation manners

[0032] As Figures 1-5 shown: The multi - stage liquid distribution automatic uniform adjustment device of the falling - film heat exchanger includes a support 1, on which a tank body 2 is fixedly installed. A liquid distribution adjustment device 3 is arranged at a position on the inner wall of one side inside the tank body 2. The liquid distribution adjustment device 3 penetrates through the inner wall of the tank body 2. Below the liquid distribution adjustment device 3 inside the tank body 2, a first heat exchange tube group 4, a second heat exchange tube group 5, and a third heat exchange tube group 6 are arranged in sequence. Two liquid blocking plates 7 arranged at intervals are fixedly installed between the second heat exchange tube group 5 and the third heat exchange tube group 6 inside the tank body 2.

[0033] In this embodiment, the support 1 is directly placed on the ground for use.

[0034] An end cover 21 is arranged at one end of the tank body 2, and a water inlet 22 and a water outlet 23 are communicated on the end cover 21.

[0035] A suction pipe 24 is communicated on the outer wall of the tank body 2 near the liquid distribution adjustment device 3, and the other end of the suction pipe 24 is communicated with the inlet end of a magnetic levitation compressor.

[0036] As Figures 4-5 shown, the liquid distribution adjustment device 3 includes a liquid distribution main pipe 31 penetrating through the inner wall of the tank body 2.

[0037] One end of the liquid distribution main pipe 31 inside the tank body 2 is communicated with two symmetrically arranged liquid distribution branch pipes 32 through a tee pipe connector.

[0038] The other ends of two liquid distribution branch pipes 32 are fixedly installed with a primary liquid distribution cavity assembly 33, and the two liquid distribution branch pipes 32 penetrate through the primary liquid distribution cavity assembly 33 at the same time.

[0039] The primary liquid distribution cavity assembly 33 includes a cavity cover 330 fixedly installed at the positions of the other ends of the two liquid distribution branch pipes 32.

[0040] A first liquid distribution plate 331 is fixedly installed at the other side end of the cavity cover 330, and the length direction of the first liquid distribution plate 331 is arranged along the length direction of the tank body 2.

[0041] A plurality of liquid distribution equalizing holes 3310 are linearly arrayed on the first liquid distribution plate 331. In this embodiment, the liquid distribution equalizing holes 3310 are arranged as through holes.

[0042] Front-end liquid blocking plates 34 are fixedly installed on both sides in the length direction of the first liquid distribution plate 331, and the angle between the front-end liquid blocking plates 34 and the surface of the first liquid distribution plate 331 away from the cavity cover 330 is arranged as an obtuse angle.

[0043] A plurality of first air holes 340 are linearly arrayed on the front-end liquid blocking plates 34.

[0044] On the opposite surfaces of the two front-end liquid blocking plates 34, a same secondary liquid distribution plate 35 is fixedly installed at a position below the first liquid distribution plate 331.

[0045] The secondary liquid distribution plate 35 is arranged in parallel with the first liquid distribution plate 331.

[0046] A plurality of spray holes 350 are linearly arrayed on the secondary liquid distribution plate 35. In this embodiment, the function of the spray holes 350 is that when the liquid refrigerant passes through the spray holes 350, a spraying effect can be achieved. In the prior art, by optimizing the hole structure, such as reducing the hole diameter, processing the hole structure into a streamline shape or a conical nozzle structure, a spraying effect can be obtained. The specific structure of the spray holes 350 will not be elaborated here.

[0047] Liquid distributor outlet liquid blocking plates 36 are vertically arranged on both sides in the length direction of the secondary liquid distribution plate 35, and the liquid distributor outlet liquid blocking plates 36 are arranged in a direction away from the secondary liquid distribution plate 35 at the same time.

[0048] The area between the two liquid distributor outlet liquid blocking plates 36 is set as a heat exchange area.

[0049] A plurality of second air holes 360 are linearly arrayed on the liquid distributor outlet liquid blocking plates 36.

[0050] With such a design, when the liquid refrigerant enters from the liquid distribution main pipe 31, it enters the liquid distribution branch pipes 32 respectively. The liquid refrigerant flowing out of the liquid distribution branch pipes 32 flows onto the first liquid distribution plate 331, and through the liquid distribution equalizing holes 3310, it can fall onto the secondary liquid distribution plate 35 without pressure drop. Under the action of the spray holes 350, the liquid refrigerant sprays out from the spray holes 350 and is sprayed onto the first heat exchange tube group 4 below the liquid distribution regulating device 3, realizing automatic and uniform liquid distribution.

[0051] As Figure 2 shown, the first heat exchange tube group 4 includes a plurality of first heat exchange tubes 41 fixedly installed in the heat exchange area. The plurality of first heat exchange tubes 41 are arranged in a staggered manner and are arranged along the length direction of the tank body 2.

[0052] The second heat exchange tube group 5 includes a plurality of second heat exchange tubes 51 fixedly installed on the inner wall of the tank body 2 and arranged in a staggered and closely arranged manner.

[0053] The plurality of second heat exchange tubes 51 are arranged along the length direction of the tank body 2.

[0054] The third heat exchange tube group 6 includes a plurality of third heat exchange tubes 61 fixedly installed on the inner wall of the tank body 2 at the bottom position of the tank body 2 and arranged in a staggered manner.

[0055] A plurality of fourth heat exchange tubes 62 are fixedly installed on the inner wall of the tank body 2 at a position below the liquid blocking plate 7 and arranged at intervals.

[0056] The first heat exchange tube group 4, the second heat exchange tube group 5, and the third heat exchange tube group 6 are all communicated with the water inlet 22 and the water outlet 23.

[0057] During use, the cooling water enters the first heat exchange tube group 4, the second heat exchange tube group 5, and the third heat exchange tube group 6 respectively from the water inlet 22. When the liquid refrigerant is sprayed onto the surface of the first heat exchange tube 41 from the spray holes 350, it absorbs the heat of the cooling water in the first heat exchange tube 41 on the surface of the first heat exchange tube 41. Subsequently, part of the liquid refrigerant is vaporized into gas. Under the action of the magnetic levitation compressor, the vaporized gas will carry part of the liquid. First, it passes through the liquid blocking plate 36 at the liquid distributor outlet. Under the action of the liquid blocking plate 36 at the liquid distributor outlet, the liquid is blocked, and the gas passes through the second air hole 360. At this time, the gas passing through the second air hole 360 still carries part of the liquid. Then it passes through the front liquid blocking plate 34. Under the action of the front liquid blocking plate 34, the liquid is further blocked, and the gas passes through the first air hole 340 and then enters the suction pipe 24 and is transported to the magnetic levitation compressor.

[0058] The liquid refrigerant sprayed out from the spray holes 350 is reheated by the second heat exchange tube 51, and then part of the liquid refrigerant is vaporized into gas. Then, it passes through the liquid blocking plate 36 at the outlet of the liquid distributor and the front liquid blocking plate 34 in sequence and then enters the suction pipe 24. At the same time, the second heat exchange tube group 5 can reduce the liquid splash caused by too high liquid level or boiling of the high-efficiency tube heat exchange, improve the dryness of the gaseous refrigerant, reduce the liquid carryover during suction, and further avoid liquid carryover during suction.

[0059] The remaining part of the liquid refrigerant will submerge to the positions of the third heat exchange tube 61 and the fourth heat exchange tube 62 at the inner bottom end of the tank body 2 for heat exchange.

[0060] The liquid blocking plate 7 can reduce the climbing phenomenon of the refrigerant liquid heat exchanger shell at the bottom of the tank body 2, and the layout of the fourth heat exchange tube 62 can optimize the layout of the bottom heat exchange tubes and increase the heat exchange area.

[0061] The gas of the refrigerant liquid after heat exchange at the positions of the third heat exchange tube 61 and the fourth heat exchange tube 62 also passes through the liquid blocking plate 36 at the outlet of the liquid distributor and the front liquid blocking plate 34 and then enters the suction pipe 24 and is transported to the magnetic levitation compressor, blocking the liquid during the suction process and improving the gas quality of the refrigerant entering the magnetic levitation compressor.

[0062] For those of ordinary skill in the art, according to the teachings of the present invention, without departing from the principles and spirit of the present invention, the changes, modifications, substitutions, and deformations made to the embodiments still fall within the protection scope of the present invention.

Claims

1. A multi-stage liquid distribution automatic uniform adjustment device for a falling film heat exchanger, comprising a bracket (1), characterized in that: A tank body (2) is fixedly installed on the bracket (1). A liquid distribution and adjustment device (3) is arranged at a position on the inner wall of one side inside the tank body (2). The liquid distribution and adjustment device (3) penetrates through the inner wall of the tank body (2). Inside the tank body (2) and below the liquid distribution and adjustment device (3), a first heat exchange tube group (4), a second heat exchange tube group (5), and a third heat exchange tube group (6) are successively arranged. Two liquid blocking plates (7) arranged at intervals are fixedly installed between the second heat exchange tube group (5) and the third heat exchange tube group (6) inside the tank body (2); The liquid distribution and adjustment device (3) includes a liquid distribution main pipe (31) penetrating through the inner wall of the tank body (2). One end of the liquid distribution main pipe (31) located inside the tank body (2) is communicated with two symmetrically arranged liquid distribution branch pipes (32). The other end of the liquid distribution branch pipe (32) is fixedly installed with a primary liquid distribution cavity assembly (33). The two liquid distribution branch pipes (32) penetrate through the primary liquid distribution cavity assembly (33) at the same time; The primary liquid distribution cavity assembly (33) includes a cavity cover (330) fixedly installed at the other end of the two liquid distribution branch pipes (32). A first liquid distribution plate (331) is fixedly installed at the other side end of the cavity cover (330). The length direction of the first liquid distribution plate (331) is arranged along the length direction of the tank body (2). A plurality of liquid distribution equalizing holes (3310) are linearly arrayed on the first liquid distribution plate (331); Front-end liquid blocking plates (34) are fixedly installed on both sides in the length direction of the first liquid distribution plate (331). A plurality of first air holes (340) are linearly arrayed on the front-end liquid blocking plates (34).

2. The multi-stage liquid distribution automatic uniform adjustment device of the falling film heat exchanger according to claim 1, characterized in that: A end cover (21) is arranged at one end of the tank body (2). A water inlet (22) and a water outlet (23) are communicated on the end cover (21).

3. The multi-stage liquid distribution automatic uniform adjustment device of the falling film heat exchanger according to claim 2, characterized in that: An air suction pipe (24) is communicated on the outer wall of the tank body (2) near the liquid distribution and adjustment device (3).

4. The multi-stage liquid distribution automatic uniform adjustment device of the falling film heat exchanger according to claim 3, characterized in that: On the opposite surfaces of the two front-end liquid blocking plates (34) and at a position below the first liquid distribution plate (331), the same secondary liquid distribution plate (35) is fixedly installed. A plurality of spray holes (350) are linearly arrayed on the secondary liquid distribution plate (35).

5. The multi-stage liquid distribution automatic uniform adjustment device of the falling film heat exchanger according to claim 4, characterized in that: Liquid distributor outlet liquid blocking plates (36) are vertically arranged on both sides in the length direction of the secondary liquid distribution plate (35). A plurality of second air holes (360) are linearly arrayed on the liquid distributor outlet liquid blocking plates (36).

6. The multi-stage liquid distribution automatic uniform adjustment device of the falling film heat exchanger according to claim 5, characterized in that: The first heat exchange tube group (4) includes a plurality of first heat exchange tubes (41) fixedly installed in the heat exchange area. The plurality of first heat exchange tubes (41) are arranged in a staggered manner and are arranged along the length direction of the tank body (2).

7. The multi-stage liquid distribution automatic uniform adjustment device of the falling film heat exchanger according to claim 6, characterized in that: The second heat exchange tube group (5) includes a plurality of second heat exchange tubes (51) fixedly installed on the inner wall of the tank body (2) and arranged in a closely staggered manner. The plurality of second heat exchange tubes (51) are arranged along the length direction of the tank body (2).

8. The multi-stage liquid distribution automatic uniform adjustment device of the falling film heat exchanger according to claim 7, characterized in that: The third heat exchange tube group (6) includes a plurality of third heat exchange tubes (61) fixedly installed on the inner wall of the tank body (2) at the bottom of the tank body (2) and arranged in a staggered manner. A plurality of fourth heat exchange tubes (62) arranged at intervals are fixedly installed on the inner wall of the tank body (2) at a position below the liquid blocking plate (7).

9. The multi-stage liquid distribution automatic uniform adjustment device of the falling film heat exchanger according to claim 8, characterized in that: The first heat exchange tube group (4), the second heat exchange tube group (5), and the third heat exchange tube group (6) are all communicated with the water inlet (22) and the water outlet (23).

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