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Falling film type evaporator

A falling-film evaporator and heat exchanger technology, which is applied to evaporators/condensers, refrigeration components, refrigerators, etc., can solve the problem that the overall heat transfer performance of falling-film evaporators is reduced, easy to evaporate incompletely, and the lower liquid The problem of uneven spraying can improve the anti-tilt, complete evaporation and improve the utilization of space.

Active Publication Date: 2019-01-04
南京恒标斯瑞冷冻机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the state of the refrigerant entering the refrigerant distributor of the falling film evaporator is gas-liquid two-phase, and the uniformity of the refrigerant distribution among the heat exchange tubes of the falling film evaporator affects the heat exchange tubes of the falling film evaporator above, it will lead to a decline in the overall heat transfer performance of the falling film evaporator
At the same time, for the evaporator with a larger cylinder, the lower part of the liquid sprays unevenly, and it is easy to evaporate incompletely.

Method used

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Effect test

Embodiment 1

[0024] Embodiment 1: as figure 1 As shown, the falling film evaporator of the present invention includes a liquid separation main pipe 1, a plurality of distributors 2 communicated with the liquid separation main pipe 1, a heat exchanger 3, and a distribution pipe connecting the distributor 2 and the heat exchanger 3. The top of the liquid pipe 4 and the heat exchanger 3 is provided with a support plate 38 for fixing the liquid pipe 4 . In this embodiment, the distance between the liquid distribution pipe 4 and the upper end of the heat exchanger 3 is not greater than 20 mm, and the distance between adjacent distributors 2 is not greater than 256 mm.

[0025] Such as figure 2 As shown, the heat exchanger 3 includes a housing 31, a liquid inlet chamber 32 located inside the housing 31, a heat exchange chamber 33 communicated with the liquid inlet chamber 32, and an air outlet chamber 34 communicated with the heat exchange chamber 33; the heat exchange chamber 33 Located at t...

Embodiment 2

[0029] Embodiment 2: as Figure 5 As shown, the cylinder of the heat exchanger 3 is square. Compared with the cylindrical cylinder of the heat exchanger 3 in Embodiment 1, the cylinder of the heat exchanger is square, which can increase the available area of ​​the cylinder and make it modular. Splicing, small footprint, the cylinder size of the evaporator can be designed according to the site, strong applicability.

[0030] In the present invention, the distribution of the original falling film evaporator liquid equalizing plate is changed to the form of a liquid separator, which can reduce the diameter of the cylinder and reduce the cost of the unit. The cooling capacity of the unit is high, and the control precision is high. The arc-shaped equalizing plate in the evaporator makes the contact between the heat exchange tube and the liquid more uniform, provides the evaporation capacity of the liquid, and increases the heat exchange efficiency of the container.

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Abstract

The invention discloses a falling film type evaporator. The falling film type evaporator comprises a liquid distribution main pipe, a plurality of distributors communicated with the liquid distribution main pipe, a heat exchanger and a liquid distribution pipe which is used for communicating the distributors with the heat exchanger; the heat exchanger comprises a shell, a liquid inlet cavity, a heat exchange cavity and an gas outlet cavity communicated with the heat exchange cavity, the heat exchange cavity is located at the lower end of the liquid inlet cavity, the gas outlet cavities are located on the two sides of the heat exchange cavity; and a liquid equalizing assembly is arranged at the joint of the liquid inlet cavity and the heat exchange cavity, a plurality of heat exchange pipesare arranged in the heat exchange cavity, and a gas baffle plate is arranged at the joint of the heat exchange cavity and the gas inlet cavity. According to the falling film type evaporator, the distributor is arranged outside the heat exchanger, so that the volume of the evaporator cylinder is reduced, the design is reasonable, the structure is simple, the control is convenient, the unit cold capacity can be improved under the refrigerating working condition, and the user requirements are met.

Description

technical field [0001] The invention relates to refrigeration equipment, in particular to a falling film evaporator in the refrigeration equipment. Background technique [0002] In the current refrigeration industry, the high-efficiency evaporators used in chillers mainly include flooded evaporators and falling film evaporators. Among them, the falling film evaporator has the advantages of less refrigerant charge and high heat exchange efficiency compared with the flooded evaporator. Therefore, falling film evaporators are more widely used in air conditioning systems. The cylinder of the existing falling film evaporator contains a liquid distributor. The liquid distributor includes a liquid equalizing plate, a liquid inlet pipe, and a heat exchange tube. The cylinder is large and the lower part is easy to collect liquid. Moreover, at present, liquid distributors mostly use two-stage multi-directional liquid separation. This structure has disadvantages such as complex opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B39/02
CPCF25B39/028F25B2339/021
Inventor 桂林松张惠孙清华何伟生孙青如
Owner 南京恒标斯瑞冷冻机械制造有限公司
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