CN219368046U

CN219368046U - Vertical falling film evaporator

Info

Publication number: CN219368046U
Application number: CN202223269260.8U
Authority: CN
Inventors: 胡匡昱
Original assignee: Kunshan Fangjia Machinery Co ltd
Current assignee: Kunshan Fangjia Machinery Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-07-18
Anticipated expiration: 2032-12-07

Abstract

The utility model provides a vertical falling film evaporator, which comprises a barrel, wherein the barrel is vertically arranged, an upper end plate and a lower end plate are respectively arranged at two ends of the barrel, a water chamber is respectively formed with two ends of the barrel, a plurality of heat exchange tube bundles are vertically arranged in the barrel, a distributor is arranged at the top of each heat exchange tube bundle, a water inlet pipe is arranged on the water chamber at the lower part of the barrel, a water outlet pipe is arranged on the water chamber at the upper part of the barrel, during refrigeration, refrigerant enters from an upper region and is distributed on the distributor, refrigerant liquid flows downwards along the heat exchange tubes, the refrigerant evaporates along the way and flows out through air holes on the air tubes, the height of an oil film is higher than that of the air holes at the bottom of the air tubes, the oil film can be carried by the refrigerant air flow to enter the air holes, the risk of accumulated oil is avoided, and during heating, the refrigerant gas enters from the air tubes and returns to the lower region and flows out from the liquid tubes, so that the problem of accumulated liquid is avoided. The heat exchange end difference of about 1 ℃ can be obtained by adopting the heat exchanger.

Description

Vertical falling film evaporator

Technical Field

The utility model relates to the field of evaporators, in particular to a vertical falling film evaporator.

Background

The falling film evaporator is widely used in the high-energy-efficiency water chilling unit, and reduces the operation cost, and the main principle is that the falling film evaporator adopts a high-efficiency pipe for enhancing evaporation heat exchange outside the pipe, and can obtain the heat exchange coefficient which is more than 3 times that of the dry evaporator. However, the falling film evaporator needs an oil return device, because the refrigerant evaporator in the flooded evaporator has too low air flow speed which is lower than 0.3m/s, the lubricating oil of the compressor cannot be brought back, the reliability is problematic, a special oil return facility is needed, meanwhile, the control of the expansion valve needs a liquid level sensor, the cost is greatly increased, and the falling film evaporator is not used on a small-sized unit all the time. The small-sized unit is relatively short, the heat exchange tube is relatively short, a plurality of processes are often required to be arranged, and the space is increased due to the increase of the processes, so that the filling amount of the refrigerant is increased. Compared with a flooded unit, the falling film evaporation type refrigerant filling amount is low, the refrigerant can be saved, and the falling film evaporation type refrigerant filling machine has the advantage of environmental protection.

In addition, the distributor in the conventional falling film evaporator has high design difficulty, high manufacturing difficulty and high cost.

In recent years, a module machine is widely applied, and belongs to a small-sized unit, and the energy efficiency is low.

Disclosure of Invention

In order to solve the technical problems, the utility model provides a vertical falling film evaporator, which comprises a cylinder body, wherein the cylinder body is vertically arranged, two ends of the cylinder body are respectively provided with an upper end plate and a lower end plate, water chambers are respectively formed with two ends of the cylinder body, a plurality of heat exchange tube bundles are vertically arranged in the cylinder body, the top of each heat exchange tube bundle is provided with a distributor, a water inlet pipe is arranged on the water chamber at the lower part of the cylinder body, a water outlet pipe is arranged on the water chamber at the upper part of the cylinder body,

a first connecting pipe is arranged below the side wall of the cylinder body, a third connecting pipe is arranged above the side wall of the cylinder body, and the third connecting pipe is communicated between the distributor and the upper end plate; the lower end plate is fixedly provided with a second connecting pipe, the second connecting pipe penetrates through the distributor and the upper end plate and extends out of the cylinder body, and the lower part of the second connecting pipe is provided with a plurality of air inlets; the two-way valve is characterized in that the first connecting pipe and the second connecting pipe are respectively connected with one-way valves, the input end of the one-way valve of the first connecting pipe is close to the first connecting pipe, the output end of the one-way valve of the second connecting pipe is close to the second connecting pipe, and a liquid inlet pipe and a liquid outlet pipe are arranged between the two one-way valves.

Preferably, a perforation is arranged at the center of the distributor, the second connecting pipe penetrates through the perforation, a plurality of open holes are formed in the surface of the distributor, and the aperture of each open hole is 2-3 mm larger than that of the heat exchange tube bundle.

Preferably, the bottom of the heat exchange tube bundle is provided with a baffle plate in a penetrating way, and the area of the baffle plate is 80% of the area of the circle.

Preferably, the air inlet is positioned at 1/5 to 1/2 of the height direction of the heat exchange tube bundle, and the diameter of the opening is 1/3 to 1/2 of the diameter of the heat exchange tube.

Preferably, the number of the openings of the air inlet holes is equal to the number of the heat exchange tubes.

Preferably, the heat exchange tube is a single-pass tube and comprises a hollow tube body, a tube core is arranged in the hollow tube body, and the end part of the outer wall of the tube core is connected with the inner wall of the hollow tube body through a connecting sheet.

Preferably, the tube core is a hollow tube with two closed ends and is made of plastic.

The vertical falling film evaporator provided by the utility model has the following beneficial effects:

during refrigeration, the refrigerant enters from the upper area, is distributed on the distributor, refrigerant liquid flows downwards along the heat exchange tube, the refrigerant evaporates along the journey and flows out through the air holes on the air tube, the height of the oil film is higher than the air holes at the bottom of the air tube, and the oil film can be brought into the air holes by the refrigerant air flow without the risk of oil accumulation.

During heating, the refrigerant gas enters from the gas pipe, turns back to the lower area, and flows out from the liquid pipe, so that the problem of liquid accumulation is avoided. The heat exchange end difference of about 1 ℃ can be obtained by adopting the heat exchanger.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are required to be used in the description of the embodiments will be briefly described below.

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a second adapter schematic diagram of the present utility model;

FIG. 3 is a cross-sectional view of a heat exchange tube bundle of the present utility model;

FIG. 4 is a schematic view of a dispenser of the present utility model;

wherein, 1, a cylinder; 2. an upper end plate; 3. a lower end plate; 4. a water chamber; 5. a heat exchange tube bundle; 6. a dispenser; 7. a water inlet pipe; 8. a water outlet pipe; 9. a first connection pipe; 10. a third connection pipe; 11. a second connection pipe; 12. a one-way valve; 13. a liquid inlet pipe and a liquid outlet pipe; 14. perforating; 15. opening holes; 16. a baffle plate; 17. a hollow tube body; 18. a die; 19. an air inlet hole.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model.

As shown in fig. 1-2, the present utility model provides a vertical falling film evaporator, which includes a cylinder 1, wherein the cylinder 1 is vertically disposed, two ends of the cylinder 1 are respectively provided with an upper end plate 2 and a lower end plate 3, and a water chamber 4 is formed between the two ends of the cylinder 1, the upper end plate 2 and the lower end plate 3 are both structures disclosed in the applicant's previous application, and the structures of the cylinder 1 are not further described herein, and it is to be noted that: the heat exchange tube bundle heat exchanger is characterized in that a plurality of heat exchange tube bundles 5 are vertically arranged in the cylinder body 1, a distributor 6 is arranged at the top of the heat exchange tube bundles 5, a water inlet pipe 7 is arranged on a water chamber 4 at the lower part of the cylinder body 1, a water outlet pipe 8 is arranged on the water chamber 4 at the upper part of the cylinder body 1, a first connecting pipe 9 is arranged below the side wall of the cylinder body 1, a third connecting pipe 10 is arranged above the water inlet pipe, the third connecting pipe 10 is communicated between the distributor 6 and the upper end plate 2, a perforation 14 is arranged in the center of the distributor 6, the second connecting pipe 11 penetrates through the perforation 14, a plurality of openings 15 are formed in the surface of the distributor 6, the aperture of the openings 15 is 2 mm-3 mm larger than that of the heat exchange tube bundles 5, refrigerant liquid can be prevented from falling into the bottom directly, the distributor 6 is used for distributing the liquid into the heat exchange tube bundles 5, a water path of the heat exchange tube bundles 5 is of a single-flow design, the second connecting pipe 11 is an air pipe, the second connecting pipe 11 is fixedly arranged on the lower end plate 3, the second connecting pipe 11 penetrates through the distributor and the upper end plate 2 and stretches out of the cylinder body 1, the second connecting pipe 11 penetrates through the distributor and the upper end plate 2, the second connecting pipe 11 is provided with a plurality of heat exchange tube bundles 1/1, the number of the heat exchange tube bundles 1/19 is equal to the number of the heat exchange tube bundles 1/1, and the number of the heat exchange tube bundles 1/the heat exchange tube bundles are 1, and the number of the heat exchange tube bundles are 1/19 are 1. Gas can enter from the gas inlet hole 19 and be discharged from the upper portion of the second connection pipe 11; the first connecting pipe 9 and the second connecting pipe 11 are respectively connected with one-way valves 12, the input end of the one-way valve 12 of the first connecting pipe is close to the first connecting pipe, the output end of the one-way valve 12 of the second connecting pipe is close to the second connecting pipe, a liquid inlet pipe 13 is arranged between the two one-way valves 12, the lower part of the second connecting pipe 11 is provided with a hole of an air pipe at the lower half part, the distributor 6 is arranged at the upper part, the first connecting pipe 9 is a liquid inlet pipe when the heat exchanger is used as an evaporator, the third connecting pipe 10 is a liquid outlet pipe when the heat exchanger is used as a condenser, and in order to realize the function, two one-way valves 12 are needed to be additionally arranged on the heat exchanger to control liquid inlet and outlet of which connecting pipe.

When used as an evaporator: the first connecting pipe 9 is used as a liquid inlet pipe, a one-way valve 12 is additionally arranged on the heat exchanger, liquid enters from the liquid inlet pipe 13 and flows into the cylinder body 1 from the one-way valve 12 of the first connecting pipe 9 through entering the first liquid pipe, a certain liquid level is formed at the bottom of the cylinder body 1, the height is 5 times the diameter of the heat exchange pipe, and an oil film exists on the surface of the liquid level. The distributor 6 has a diameter of 1-3 times of the heat exchange tube from the top plate, the refrigerant is distributed in the distributor, the liquid is distributed on each heat exchange tube, then flows downwards along the heat exchange tubes, evaporates along the path, the evaporated gas enters the air holes on the second connecting tube 11, flows out, and the boiled refrigerant takes away the oil film along with the air flow, enters the air pipes and is discharged.

When the condenser is used, refrigerant enters from the second connecting pipe 11, condenses on the heat exchange pipe and falls into the bottom, the bottom of the heat exchange pipe bundle 5 is penetrated with a baffle plate 16, the baffle plate 16 is arched, the area is 80% of the circular area, and under the action of the baffle plate 16 at the bottom, the heat exchange pipe is flushed to be supercooled, and flows out from the third connecting pipe 10. By adopting the design, good oil return can be obtained, and the supercooling degree is enough when the condenser is used as a condenser.

In addition, in order to guarantee that the heat exchange tube is not frozen out, the heat exchange tube is the single pass tube, including the hollow body 17, be equipped with the tube core 18 in the hollow body 17, the tube core 18 is both ends confined hollow tube to make by plastics, tube core 18 outer wall tip pass through the connection piece with hollow body 17 inner wall is connected, connection piece and tube core 18 injection moulding become a plurality of settings at tube core 18 outer walls, can block tube core 18 in the body, when taking place to freeze, ice can compress the air in the core, avoids the pipeline to expand and bad.

Claims

1. The vertical falling film evaporator comprises a cylinder, wherein the cylinder is vertically arranged, an upper end plate and a lower end plate are respectively arranged at two ends of the cylinder, a water chamber is respectively formed with two ends of the cylinder, a plurality of heat exchange tube bundles are vertically arranged in the cylinder, a distributor is arranged at the top of each heat exchange tube bundle, a water inlet pipe is arranged on the water chamber at the lower part of the cylinder, a water outlet pipe is arranged on the water chamber at the upper part of the cylinder, and the vertical falling film evaporator is characterized in that,

2. The vertical falling film evaporator according to claim 1, wherein a perforation is arranged in the center of the distributor, the second connecting pipe penetrates through the perforation, a plurality of open holes are formed in the surface of the distributor, and the aperture of the open holes is 2-3 mm larger than that of the heat exchange tube bundle.

3. The vertical falling film evaporator according to claim 1, wherein the bottom of the heat exchange tube bundle is provided with a baffle plate in a penetrating manner, and the baffle plate is arched and has an area which is 80% of the circular area.

4. The vertical falling film evaporator according to claim 1, wherein the air inlet holes are formed at 1/5 to 1/2 of the height direction of the heat exchange tube bundle, and the diameter of the openings is 1/3 to 1/2 of the diameter of the heat exchange tubes.

5. The vertical falling film evaporator according to claim 1, wherein the number of openings of the air intake holes is equal to the number of heat exchange tubes.

6. The vertical falling film evaporator according to claim 1, wherein the heat exchange tube is a single pass tube and comprises a hollow tube body, a tube core is arranged in the hollow tube body, and the end part of the outer wall of the tube core is connected with the inner wall of the hollow tube body through a connecting sheet.

7. The vertical falling film evaporator of claim 6, wherein the tube core is a hollow tube closed at both ends and is made of plastic.