Multi-unit flooded evaporator

Abstract

The utility model relates to the field of evaporators, and provides a multi-unit flooded evaporator. Comprising a horizontal cylindrical shell, a distributor is installed at the bottom in the shell, the distributor extends in the length direction of the shell, the distributor is a square pipe body, the center of the bottom of the distributor is communicated with the refrigerant inlet pipe, and a plurality of layers of distribution plates are arranged at the top of the distributor; a refrigerant enters from the bottom and is uniformly upwelling through the distributor, so that the refrigerant can be uniformly contacted with the heat exchange tubes while the heat exchange tubes are prevented from being impacted, and finally, the heat exchange tubes are completely immersed in the refrigerant, so that the heat exchange efficiency is improved; the liquid baffle is installed on the refrigerant outlet pipe, liquid drops in gaseous refrigerants are separated by the liquid baffle, and the situation that the liquid drops enter the compressor and damage the compressor is avoided; according to the technical scheme, the two refrigerant outlet pipes are arranged, and the same evaporator can correspond to two heat exchange units.

Description

Technical Field

[0001] The utility model relates to the field of evaporators, in particular to a multi-unit flooded evaporator. Background Art

[0002] The evaporator is a crucial component of a refrigeration unit. Liquid refrigerant evaporates in the evaporator after exchanging heat with cooling water, forming a gaseous refrigerant. This gaseous refrigerant then enters the compressor for compression. In a shell-and-tube evaporator, the liquid refrigerant enters the evaporator and exchanges heat with the heat exchange tubes within the evaporator. This impacts the tubes during entry, and the uneven contact between the refrigerant and the tubes reduces heat exchange efficiency. Liquid droplets are often present in the evaporated refrigerant gas, which can damage the compressor if they enter. Therefore, the evaporator must fully evaporate the refrigerant to improve heat exchange efficiency, while also effectively preventing droplets from entering the compressor to extend its lifespan. Summary of the Invention

[0003] In order to improve the heat exchange efficiency of the evaporator and prevent liquid droplets from entering the compressor, the utility model provides a multi-unit flooded evaporator.

[0004] The technical solution adopted by this utility model is:

[0005] A multi-unit flooded evaporator comprises a horizontal cylindrical shell, support legs are mounted at both ends of the shell, end caps are mounted on both end surfaces of the shell, tube sheets are mounted between each end cap and the corresponding shell end surface, a liquid separation cavity is formed between the end cap and the corresponding tube sheet, one of the end caps is provided with a liquid outlet and a liquid inlet distributed vertically, a plurality of heat exchange tubes are mounted in the shell, the ends of the heat exchange tubes respectively engage with tube holes on the corresponding tube sheet, the ends of the heat exchange tubes are connected to the corresponding liquid separation cavity, a partition is provided in each liquid separation cavity, the partition changes the flow direction of the coolant in the heat exchange tubes; A refrigerant outlet pipe is provided at the top of the shell, a refrigerant inlet pipe is provided at the bottom of the shell, a distributor is installed at the bottom of the shell, the distributor is supported inside the shell via a support plate, the distributor extends along the length direction of the shell, the distributor is a square tube body, both ends of the distributor are closed, the bottom center of the distributor is connected to the refrigerant inlet pipe, a multi-layer distribution plate is provided on the top of the distributor, each of the distribution plates is provided with a plurality of evenly distributed distribution holes, the aperture of the lower distribution plate is larger than the aperture of the upper distribution plate, and the number of distribution holes on the lower distribution plate is less than the number of distribution holes on the upper distribution plate.

[0006] Furthermore, a liquid baffle is installed at the connection between the shell and the refrigerant outlet pipe. The liquid baffle includes a bottom plate, front and rear side plates and end plates on both sides. A liquid baffle cavity is formed between the liquid baffle and the inner wall of the shell. The bottom end of the refrigerant outlet pipe is located in the liquid baffle cavity. The front and rear side plates of the liquid baffle are respectively provided with multiple rows of evenly distributed air holes.

[0007] Furthermore, two refrigerant outlet pipes are provided on the top of the shell, and each of the refrigerant outlet pipes corresponds to a liquid baffle.

[0008] Furthermore, a safety valve assembly is installed on one side of the top of the shell, and an interface of the safety valve assembly is located in the liquid baffle.

[0009] Furthermore, the heat exchange tubes are located below the horizontal center plane of the shell, the heat exchange tubes are located above the distributor, or the heat exchange tubes are distributed above and on both sides of the distributor.

[0010] Furthermore, a liquid level gauge is installed on the outer side of the shell, and the upper liquid point of the liquid level gauge is located at the horizontal center plane of the shell.

[0011] Furthermore, a bypass pipe is installed on one side of the top of the shell, the bypass pipe is connected to the inner cavity of the shell, and the bottom end of the bypass pipe is located above the liquid level.

[0012] Furthermore, the liquid inlet and the liquid outlet are respectively equipped with a temperature sensor and a pressure sensor.

[0013] After adopting the above technical solution, the beneficial effects of the utility model are:

[0014] The refrigerant enters from the bottom and flows upward evenly through the distributor, which avoids impacting the heat exchange tubes while ensuring uniform contact between the refrigerant and the heat exchange tubes. Ultimately, all the heat exchange tubes are immersed in the refrigerant, thereby improving heat exchange efficiency. By installing a liquid baffle at the refrigerant outlet pipe, droplets in the gaseous refrigerant are separated by the liquid baffle, preventing the droplets from entering the compressor and causing damage to the compressor. This technical solution provides two refrigerant outlet pipes, which enables the same evaporator to correspond to two heat exchange units. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the main view of the utility model.

[0016] Figure 2 It is a cross-sectional view of the present invention.

[0017] In the figure: shell 1, support leg 2, end cover 3, tube sheet 4, liquid outlet 5, liquid inlet 6, heat exchange tube 7, refrigerant outlet pipe 8, refrigerant inlet pipe 9, distributor 10, distribution plate 11, liquid baffle 12, air hole 13, safety valve assembly 14, liquid level gauge 15, bypass pipe 16. DETAILED DESCRIPTION

[0018] The following is a further description of the specific embodiments of the present invention with reference to the accompanying drawings:

[0019] like Figure 1-2 As shown, a multi-unit flooded evaporator comprises a horizontal cylindrical shell 1 with support legs 2 installed at both ends for mounting the evaporator on the unit. End caps 3 are installed at each end face of the shell 1, and a tube sheet 4 is installed between each end cap 3 and the corresponding end face of the shell. The end caps 3, tube sheet 4, and the end face of the shell 1 are fixed together via flanges. A liquid separation chamber is formed between the end caps 3 and the corresponding tube sheet 4. The end cap of the left liquid separation chamber is provided with a liquid outlet 5 and a liquid inlet 6 distributed vertically. The liquid inlet 6 and the liquid outlet 5 are respectively equipped with a temperature sensor and a pressure sensor. Multiple heat exchange tubes 7 are installed within the shell 1. The ends of the heat exchange tubes 7 are respectively installed in conjunction with the corresponding tube holes in the tube sheet 4, and the installation method is expansion tube installation. The ends of the heat exchange tubes 7 are connected to the corresponding liquid separation chamber. A partition is provided within the liquid separation chamber. The multiple heat exchange tubes and the partition form a back-and-forth zigzag tube channel. Cooling water enters from the liquid inlet 6, changes direction in the liquid separation cavity at the opposite end, returns to the liquid separation cavity corresponding to the liquid outlet 5, and is discharged from the liquid outlet 5. The partition changes the flow direction of the coolant in the heat exchange tube and can form multiple return tube channels as needed.

[0020] A refrigerant outlet pipe 8 is provided on the top of the shell 1, and a refrigerant inlet pipe 9 is provided on the bottom of the shell 1. A distributor 10 is installed at the bottom of the shell 1. The distributor 10 is supported inside the shell 1 by a support plate. The distributor 10 extends along the length direction of the shell 1. The distributor 10 is a square tube body. Both ends of the distributor 10 are closed. The bottom center of the distributor 10 is connected to the refrigerant inlet pipe 9. The liquid refrigerant enters the distributor 10 and is blocked by the distributor 10. A multi-layer distribution plate 11 is provided on the top of the distributor 10. Each distribution plate is respectively provided with a plurality of evenly distributed distribution holes. The aperture of the lower distribution plate is larger than the aperture of the upper distribution plate, and the number of distribution holes on the lower distribution plate is less than the number of distribution holes on the upper distribution plate. After the liquid refrigerant is distributed by the multi-layer distribution plate 11, it finally enters the shell 1 at a slower speed, avoiding impact on the heat exchange tube 7 and forming a certain liquid level inside the shell 1 to ensure the heat exchange time.

[0021] Heat exchange tubes 7 are supported within the shell by supports and are located below the horizontal center plane of shell 1. Heat exchange tubes 7 are located above distributor 10, with the lower heat exchange tubes located on both sides of distributor 10. Heat exchange tubes 7 are all located below the refrigerant liquid level. After exchanging heat with heat exchange tubes 7, the refrigerant evaporates and is delivered to the compressor through refrigerant outlet pipe 8 at the top of the shell.

[0022] Two refrigerant outlet pipes 8 are provided at the top of the shell 1, which can simultaneously supply refrigerant gas to both units. Each refrigerant outlet pipe corresponds to a liquid baffle 12. Liquid baffle 12 is located inside the shell 1 at the connection with the refrigerant outlet pipe 8. Liquid baffle 12 includes a bottom plate, front and rear side plates, and end plates on both sides. The liquid baffle 12 and the inner wall of the shell form a liquid baffle cavity, and the bottom end of the refrigerant outlet pipe is located in the liquid baffle cavity. The front and rear side plates of the liquid baffle are respectively provided with multiple rows of evenly distributed air holes 13 for the passage of refrigerant gas.

[0023] A safety valve assembly 14 is mounted on one side of the top of the housing 1. Its interface is located within the liquid baffle 12 and serves to relieve pressure from the evaporator. A liquid level gauge 15 is mounted on the outside of the housing 1. Its upper liquid level is located at or slightly above the horizontal center plane of the housing and is used to monitor the refrigerant level within. A bypass pipe 16 is mounted on one side of the top of the housing. This bypass pipe 16 communicates with the interior of the housing, with its bottom end positioned above the liquid level.

Claims

1. A multi-unit flooded evaporator, comprising a horizontal cylindrical shell, support legs are installed at both ends of the shell, end covers are installed on the two end faces of the shell, tube sheets are installed between each end cover and the corresponding shell end face, a liquid separation cavity is formed between the end cover and the corresponding tube sheet, one of the end covers is provided with a liquid outlet and a liquid inlet distributed up and down, a plurality of heat exchange tubes are installed in the shell, the two ends of the heat exchange tubes are respectively matched with the tube holes on the corresponding tube sheet, the two ends of the heat exchange tubes are connected with the corresponding liquid separation cavity, a partition is provided in each of the liquid separation cavities, the partition changes the flow direction of the coolant in the heat exchange tube; a refrigerant outlet pipe is provided on the top of the shell, and a refrigerant inlet pipe is provided on the bottom of the shell, characterized in that A distributor is installed at the bottom of the shell, and the distributor is supported inside the shell by a support plate. The distributor extends along the length direction of the shell. The distributor is a square tube body, and both ends of the distributor are closed. The bottom center of the distributor is connected to the refrigerant inlet pipe. The top of the distributor is provided with a multi-layer distribution plate, and each distribution plate is provided with a plurality of evenly distributed distribution holes. The aperture of the lower distribution plate is larger than the aperture of the upper distribution plate, and the number of distribution holes on the lower distribution plate is less than the number of distribution holes on the upper distribution plate.

2. The multi-unit flooded evaporator according to claim 1, characterized in that: A liquid baffle is installed at the connection between the shell and the refrigerant outlet pipe. The liquid baffle includes a bottom plate, front and rear side plates and end plates on both sides. A liquid baffle cavity is formed between the liquid baffle and the inner wall of the shell. The bottom end of the refrigerant outlet pipe is located in the liquid baffle cavity. Multiple rows of evenly distributed air holes are respectively provided on the front and rear side plates of the liquid baffle.

3. The multi-unit flooded evaporator according to claim 2, characterized in that: Two refrigerant outlet pipes are provided on the top of the shell, and each of the refrigerant outlet pipes corresponds to a liquid baffle.

4. The multi-unit flooded evaporator according to claim 2, characterized in that: A safety valve assembly is installed on one side of the top of the shell, and an interface of the safety valve assembly is located in the liquid baffle.

5. The multi-unit flooded evaporator according to claim 1, characterized in that: The heat exchange tubes are located below the horizontal center plane of the shell, the heat exchange tubes are located above the distributor, or the heat exchange tubes are distributed above and on both sides of the distributor.

6. The multi-unit flooded evaporator according to claim 1, characterized in that: A liquid level gauge is installed on the outer side of the shell, and the upper liquid point of the liquid level gauge is located at the horizontal center plane of the shell.

7. The multi-unit flooded evaporator according to claim 1, characterized in that: A bypass pipe is installed on one side of the top of the shell. The bypass pipe is connected to the inner cavity of the shell, and the bottom end of the bypass pipe is located above the liquid level.

8. The multi-unit flooded evaporator according to claim 1, characterized in that: The liquid inlet and the liquid outlet are respectively equipped with a temperature sensor and a pressure sensor.

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