Falling film evaporator capable of uniformly distributing liquid

Abstract

The utility model relates to the field of evaporators, and provides a falling film evaporator capable of uniformly distributing liquid. Comprising a shell, the shell comprises a left shell body and a right shell body, the opposite end faces of the left shell body and the right shell body are connected through a flange, a middle tube plate is installed between the left shell body and the right shell body, and the left shell body and the right shell body are divided into two independent cavities through the tube plate; the left shell and the right shell are each internally provided with a liquid separation assembly, and the liquid separation assemblies are located between the corresponding heat exchange pipes and the corresponding refrigerant inlet pipe. The liquid separation assembly comprises multiple layers of liquid separation plates, densely distributed liquid leakage holes are evenly distributed in the liquid separation plates, and the positions of the liquid leakage holes of every two adjacent layers of liquid separation plates are staggered. By arranging the multiple layers of liquid separation plates, after refrigerant liquid is sequentially separated through the multiple layers of liquid separation plates, all the heat exchange pipes can make full contact with the refrigerant, and the heat exchange efficiency of the evaporator is improved. And by arranging the cover plate, gasified gas can enter the refrigerant outlet pipe from the gap between the outer side of the cover plate and the shell, and the situation that the compressor is damaged due to the fact that the gas is mixed with liquid is prevented.

Description

Technical Field

[0001] The utility model relates to the field of evaporators, in particular to a falling film evaporator with uniform liquid distribution. Background Art

[0002] The falling film evaporator is an important component of a refrigeration unit. The gas-liquid mixed refrigerant exchanges heat in the falling film evaporator. The liquid refrigerant is evaporated into gas and sent into the compressor for compression. The unevaporated liquid refrigerant and the lubricant contained in the refrigerant are collected at the bottom of the falling film evaporator and separately collected and processed through a pump or a valve.

[0003] During the working process of the falling film evaporator, the full contact between the liquid refrigerant and the heat exchange tubes has a great influence on the heat exchange effect of the evaporator. Usually, the gas-liquid mixed refrigerant enters the evaporator from the refrigerant inlet pipe and exchanges heat with the heat exchange tubes during the downward flow. Due to the relatively fast liquid flow rate and short heat exchange time, the heat exchange is incomplete, affecting the evaporation effect. At the same time, the gas is prone to carry liquid droplets during the output process of the refrigerant outlet pipe, which will affect the service life of the compressor. Summary of the Invention

[0004] In order to improve the heat exchange efficiency of the falling film evaporator and reduce the damage to the compressor, the utility model provides a falling film evaporator with uniform liquid distribution.

[0005] The technical solution adopted by the utility model is as follows:

[0006] A falling film evaporator with uniform liquid distribution includes a housing. The housing is a horizontal cylinder. Water inlet chamber assemblies and water return chamber assemblies are respectively installed at both ends of the housing. Support feet are respectively installed at both ends of the bottom of the housing. A support frame is installed at the top of the housing. The housing includes a left housing and a right housing. The opposite end faces of the left and right housings are connected by a flange. An intermediate tube sheet is installed between the left and right housings. The tube sheet divides the left and right housings into two independent cavities. The water inlet chamber assembly is installed on the left end face of the left housing, and the water return chamber assembly is installed on the right end face of the right housing. Water inlet cavities and water return cavities are respectively separated by a partition plate and an end tube sheet inside the water inlet chamber assembly and the water return chamber assembly. Multiple heat exchange tubes are installed inside the housing. The heat exchange tubes pass through the end tube sheets and the intermediate tube sheet at both ends, and the heat exchange tubes communicate with the cavities of the water inlet chamber assembly and the water return chamber assembly. Refrigerant inlet pipes and refrigerant outlet pipes are respectively installed at the tops of the left and right housings. The refrigerant inlet pipe and the refrigerant outlet pipe are respectively located at both ends of the corresponding housing. Liquid distribution assemblies are respectively installed inside the left and right housings. The liquid distribution assemblies are respectively located between the corresponding heat exchange tubes and the refrigerant inlet pipes.

[0007] Further, the liquid separation component includes multiple layers of liquid separation plates which are arranged vertically. The two ends of each liquid separation plate extend to the end plates on both sides inside the corresponding housing. The liquid separation plate is located directly below the refrigerant inlet pipe, and its vertical projection covers the heat exchange tubes. Each liquid separation plate is evenly distributed with dense liquid leakage holes, and the positions of the liquid leakage holes of adjacent two layers of liquid separation plates are offset.

[0008] Further, the number of liquid leakage holes on the upper liquid separation plate is less than that on the lower liquid separation plate, and the aperture of the liquid leakage holes on the upper liquid separation plate is larger than that on the lower liquid separation plate.

[0009] Further, each of the liquid separation plates is inclined, and the inclination directions of adjacent liquid separation plates are opposite.

[0010] Further, a cover plate is installed directly above the liquid separation plate. The refrigerant inlet pipe is connected to the cover plate. On both sides in the width direction of the cover plate, there are downward inclined baffle plates which open towards both sides in the width direction of the liquid separation plate and cover the heat exchange tubes. The inner wall of the inclined baffle plate is in contact and cooperation with the side plates of each liquid separation plate, and there is a ventilation gap between the inclined baffle plate and the inner wall of the housing.

[0011] Further, oil return ports are respectively arranged at the bottoms of the left housing and the right housing, and the oil return ports are connected with an air pump through pipelines.

[0012] Still further, liquid level gauges are respectively connected to the sides of the left housing and the right housing.

[0013] After adopting the above technical solutions, the beneficial effects of the present utility model are as follows:

[0014] By arranging multiple layers of liquid separation plates, after the refrigerant liquid is separated layer by layer through the multiple layers of liquid separation plates, the flow rate changes from fast to slow and is evenly distributed along the length direction of the heat exchange tubes, so that each heat exchange tube can be in full contact with the refrigerant, improving the heat exchange efficiency of the evaporator. By arranging the cover plate, it can ensure that the gasified gas enters the refrigerant outlet pipe from the gap between the outside of the cover plate and the housing, preventing the liquid mixed in the gas from damaging the compressor. By dividing the housing into two independent left and right housings, the same evaporator is divided into two evaporator units, and the two evaporator units share the heat exchange tube assembly, saving the space and cost of the combined unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of the present utility model.

[0016] Figure 2 It is a main sectional view of the present utility model.

[0017] Figure 3 It is a side sectional view of the present utility model.

[0018] In the figure: housing 1, heat exchange tube group 2, liquid distribution component 3, left housing 4, right housing 5, intermediate tube sheet 6, water inlet chamber component 7, water return chamber component 8, water inlet 9, water return port 10, refrigerant inlet pipe 11, refrigerant outlet pipe 12, cover plate 13, liquid distribution plate 14, inclined baffle 15, liquid level gauge 16, oil return port 17, partition plate 18, end tube sheet 19. Detailed implementation mode

[0019] The following further details the specific implementation mode of the present utility model in conjunction with the attached drawings:

[0020] As Figure 1-2 shown, a falling film evaporator with uniform liquid distribution is composed of three parts: a housing 1, a heat exchange tube group 2, and a liquid distribution component 3.

[0021] The housing is a horizontal cylinder. Support feet are respectively installed at both ends of the bottom of the housing, and a support frame is installed at the top of the housing. The housing 1 is divided into two parts: a left housing 4 and a right housing 5. An intermediate tube sheet 6 is installed between the left and right housings to divide the housing 1 into two independent heat exchange chambers. The opposite end faces of the left and right housings are connected by flanges. A water inlet chamber component 7 and a water return chamber component 8 are respectively installed at both ends of the housing. The water inlet chamber component 7 is installed on the left end face of the left housing 4, and the water return chamber component 8 is installed on the right end face of the right housing 5. The inner sides of the water inlet chamber component 7 and the water return chamber component 8 are respectively divided into a water inlet chamber and a water return chamber by a partition plate 18 and an end tube sheet 19. The heat exchange tube group 2 includes multiple heat exchange tubes arranged in parallel. The heat exchange tubes pass through the end tube sheets 19 at both ends and the intermediate tube sheet 6, and each heat exchange tube connects the cavities of the water inlet chamber component 7 and the water return chamber component 8; the flow direction of the cooling water in the heat exchange tubes is changed respectively by the partition plate 18 in the cavities of the water inlet chamber component 7 and the water return chamber component 8, forming a tube pass that enters water from the water inlet 9 of the water inlet chamber component 7 and returns water from the water return port 10 of the water inlet chamber component 7.

[0022] A refrigerant inlet pipe 11 and a refrigerant outlet pipe 12 are respectively installed at the tops of the left and right housings. The refrigerant inlet pipe 11 and the refrigerant outlet pipe 12 are respectively located at both ends of the corresponding housing. A liquid distribution component 3 is installed in each of the left and right housings, and the liquid distribution component 3 is located between the corresponding heat exchange tube section and the refrigerant inlet pipe 11.

[0023] As Figure 3 shown, the liquid distribution component 3 consists of a cover plate 13 and multiple layers of liquid distribution plates 14. The refrigerant inlet pipe 11 is connected to the cover plate 13. Inclined baffles 15 are provided on both sides in the width direction of the cover plate 13. The inclined baffles 15 open towards both sides in the width direction of the liquid distribution plate 14 and cover the heat exchange tubes. There is an air vent gap between the inclined baffles 15 and the inner wall of the housing.

[0024] The multi-layer liquid separation plates 14 are arranged one above the other. The two ends of the liquid separation plates 14 in the length direction extend to the end plates on both sides inside the corresponding shell. The two sides of the liquid separation plates 14 in the width direction are in contact with the inclined baffle plates 15. The vertical projection of the lowermost liquid separation plate covers all the heat exchange tubes; a large number of densely distributed liquid leakage holes are evenly arranged on each liquid separation plate 14, and the positions of the liquid leakage holes of adjacent two layers of liquid separation plates are offset. The number of liquid leakage holes on the upper liquid separation plate is less than that on the lower liquid separation plate, and the aperture of the liquid leakage holes on the upper liquid separation plate is larger than that on the lower liquid separation plate. In order to facilitate the better flow of the refrigerant, the liquid separation plates 14 are arranged at a certain angle in the length direction, and the inclination directions of adjacent liquid separation plates are opposite.

[0025] The refrigerant in a gas-liquid mixture enters from the refrigerant inlet pipe 11. The liquid refrigerant is sequentially distributed downward through the multi-layer liquid separation plates 14 and evenly drops onto the heat exchange tube group 2 below, exchanges heat with the heat exchange tube group 2 and vaporizes. The gaseous refrigerant entering from the refrigerant inlet pipe 11 and the vaporized gaseous refrigerant are guided by the cover plate 13 and the inclined baffle plates 15 on both sides thereof, and go upward along the gap between the inclined baffle plates 15 and the shell at the bottom of the cover plate 13 and are output from the refrigerant outlet pipe 12. The unvaporized refrigerant and the lubricating oil contained therein drip to the bottom of the shell for collection. Oil return ports 17 are respectively arranged at the bottoms of the left shell and the right shell, and an air pump is connected to the oil return ports 17 through pipelines. The left shell and the right shell are also equipped with liquid level gauges 16 to facilitate observing the liquid level inside.

Claims

1. A falling film evaporator with uniform liquid distribution, comprising a housing. The housing is a horizontal cylinder. Water inlet chamber assemblies and water return chamber assemblies are respectively installed at both ends of the housing. Support feet are respectively installed at both ends of the bottom of the housing. A support frame is installed at the top of the housing. It is characterized in that, The housing includes a left housing and a right housing. The opposite end faces of the left and right housings are connected by a flange. An intermediate tube sheet is installed between the left and right housings, and the tube sheet divides the left and right housings into two independent cavities. The water inlet chamber assembly is installed on the left end face of the left housing, and the water return chamber assembly is installed on the right end face of the right housing. The inner sides of the water inlet chamber assembly and the water return chamber assembly are respectively separated into a water inlet cavity and a water return cavity by a partition plate and an end tube sheet. A plurality of heat exchange tubes are installed in the housing, and the heat exchange tubes pass through the end tube sheets and the intermediate tube sheet at both ends. The heat exchange tubes connect the cavities of the water inlet chamber assembly and the water return chamber assembly. The refrigerant inlet pipe and the refrigerant outlet pipe are respectively installed at the tops of the left and right housings. The refrigerant inlet pipe and the refrigerant outlet pipe are respectively located at both ends of the corresponding housing. Liquid distribution assemblies are respectively installed in the left and right housings, and the liquid distribution assemblies are respectively located between the corresponding heat exchange tubes and the refrigerant inlet pipes.

2. The falling film evaporator for uniform liquid distribution according to claim 1, characterized in that, The liquid distribution assembly includes multiple liquid distribution plates. The multiple liquid distribution plates are arranged up and down. The two ends of the liquid distribution plate extend to the end plates on both sides in the corresponding housing. The liquid distribution plate is located directly below the refrigerant inlet pipe, and its vertical projection covers the heat exchange tubes. A plurality of leakage holes are evenly distributed on each liquid distribution plate, and the positions of the leakage holes of adjacent two layers of liquid distribution plates are offset.

3. The falling film evaporator with uniform liquid distribution according to claim 2, wherein The number of leakage holes on the upper liquid distribution plate is less than that on the lower liquid distribution plate, and the aperture of the leakage holes on the upper liquid distribution plate is larger than that on the lower liquid distribution plate.

4. A falling film evaporator with uniform liquid distribution according to claim 2, characterized in that, Each liquid distribution plate is inclined, and the inclination directions of adjacent liquid distribution plates are opposite.

5. The falling film evaporator with uniform liquid distribution according to claim 2, characterized in that, A cover plate is installed directly above the liquid distribution plate. The refrigerant inlet pipe is connected to the cover plate. The two sides in the width direction of the cover plate are provided with downward inclined baffle plates. The inclined baffle plates open towards both sides in the width direction of the liquid distribution plate and cover the heat exchange tubes. The inner wall of the inclined baffle plate is in contact and cooperation with the side plates of each liquid distribution plate. An air vent gap is left between the inclined baffle plate and the inner wall of the housing.

6. The falling film evaporator with uniform liquid distribution according to claim 1, characterized in that, Oil return ports are respectively provided at the bottoms of the left housing and the right housing, and the oil return ports are connected to an air pump through pipelines.

7. A falling film evaporator with uniform liquid distribution according to claim 1, characterized in that, Level gauges are respectively connected to the sides of the left housing and the right housing.

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