Novel falling film evaporator

Abstract

The utility model provides a novel falling film evaporator which comprises a heat exchange shell and a heat exchange pipe, the heat exchange shell is provided with a heat exchange inner cavity, the heat exchange pipe is installed in the heat exchange inner cavity, the bottom of the heat exchange shell is provided with an oil storage cavity, the oil storage cavity is provided with a refrigerant liquid inlet pipe and a liquid distribution pipe, and a liquid outlet of the refrigerant liquid inlet pipe is communicated with the oil storage cavity. A liquid inlet of the liquid distribution pipe communicates with the oil storage cavity, the liquid distribution pipe is provided with a plurality of liquid spraying holes communicating with the heat exchange inner cavity, and the upper end of the heat exchange inner cavity communicates with a refrigerant air suction pipe. The evaporator is simple in structure, refrigerants can be sprayed out at different positions of the heat exchange inner cavity, different heat exchange pipe sections are made to make full contact with the refrigerants, the effective utilization rate of the heat exchange pipes is increased, the refrigerating capacity of the whole evaporator is increased, refrigerant bias flow can be avoided, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of evaporators, specifically a novel falling film evaporator. Background Technology

[0002] With the continuous improvement of living standards, existing heat pump systems are widely used, utilizing the heat absorption and release phenomena generated by the liquid and gas phase changes of the refrigerant. For example, in the air conditioning cooling process, the refrigerant is drawn into the compressor and compressed, then releases heat and condenses into a liquid in the condenser. It then passes through a throttling device to reduce its pressure, and finally enters the heat exchanger to absorb heat and evaporate, returning to the compressor as vapor, thus realizing the refrigeration cycle and regulating the temperature of the medium or the surrounding environment. In the air conditioning heating process, the refrigerant is drawn into the compressor and compressed, then releases heat and condenses in the heat exchanger. It then passes through a throttling device to reduce its pressure, and finally enters the evaporator to absorb heat and evaporate into a gas, flowing back to the compressor.

[0003] Most of the evaporators mentioned above are flooded evaporators, which are the most common heat exchange components. They mainly include a heat exchange shell for storing refrigerant and heat exchange tubes for the flow of the medium. The heat exchange shell has a heat exchange cavity, and the heat exchange tubes are installed in the heat exchange cavity. The liquid inlet end and liquid outlet end of the heat exchange tubes are respectively connected to a medium input pipe and a medium output pipe. At the same time, the heat exchange cavity is connected to a refrigerant input pipe and a refrigerant output pipe.

[0004] During operation, the refrigerant and refrigeration oil undergo large-space boiling within the evaporator shell, resulting in high energy efficiency.

[0005] However, existing evaporators have the following shortcomings during use:

[0006] 1) The refrigerant can only be sprayed on one side of its heat exchange cavity, resulting in uneven refrigerant distribution.

[0007] 2) The refrigerant in the heat exchange cavity is subject to high damping and has low fluidity, which makes it easy to form an oil film on the heat exchange tube, reducing the heat exchange efficiency.

[0008] 3) The location of the refrigerant spray nozzle results in low heat exchange efficiency due to low refrigerant flow. If a large amount of refrigeration oil accumulates in the heat exchange tank, it will cause the compressor to lack oil, disrupt the balance of oil entering and leaving the compressor, and reduce the efficiency of the evaporator. Summary of the Invention

[0009] The purpose of this invention is to address the shortcomings of existing technologies by proposing a novel falling film evaporator.

[0010] The objective of this invention is achieved as follows: A novel falling film evaporator includes a heat exchange shell for storing refrigerant and heat exchange tubes for supplying heat exchange for medium flow. The heat exchange shell has a heat exchange inner cavity, and the heat exchange tubes are installed in the heat exchange inner cavity. The bottom of the heat exchange shell is provided with an oil storage chamber. The oil storage chamber is provided with a refrigerant inlet pipe for supplying refrigerant and a distributor pipe for spraying refrigerant onto the heat exchange tubes at different positions. The outlet of the refrigerant inlet pipe is connected to the oil storage chamber, and the inlet of the distributor pipe is connected to the oil storage chamber. The distributor pipe is provided with several spray holes connected to the heat exchange inner cavity. The upper end of the heat exchange inner cavity is connected to a refrigerant suction pipe.

[0011] Based on the above optimization, the bottom of the heat exchange shell is provided with an oil return pipe, the inlet of the oil return pipe is connected to the oil storage chamber, and the outlet of the oil return pipe is connected to the compressor.

[0012] Based on the above optimization, the heat exchange inner cavity includes a central tube, and the heat exchange tubes are coiled from top to bottom around the outer wall of the central tube, so that the heat exchange tubes form sensible heat exchange tube sections and subcooled heat exchange tube sections with equal pitch.

[0013] Based on the above optimization, the heat exchange inner cavity is equipped with several liquid distribution pipes, which extend upwards from the oil storage cavity toward the subcooled heat exchange tube section and the sensible heat exchange tube section. The liquid spray holes are evenly distributed on the subcooled heat exchange tube section and the sensible heat exchange tube section.

[0014] Based on the above optimization, the oil storage chamber is located at the bottom of the central tube, the refrigerant inlet pipe is installed at the top center of the heat exchange outer shell, and the inlet of the refrigerant inlet pipe is connected to an external refrigerant supply source.

[0015] Based on the above optimization, the liquid inlet of the liquid separator and the liquid outlet of the refrigerant inlet are located at the bottom of the oil storage chamber.

[0016] Based on the above optimization, the heat exchange cavity is equipped with several liquid distribution pipes, and the inlets of the several liquid distribution pipes are located on the same horizontal plane of the oil storage cavity.

[0017] Based on the above optimization, the heat exchange tube is connected to a medium inlet pipe and a medium outlet pipe, and the medium inlet pipe and the medium outlet pipe are distributed diagonally on the heat exchange shell.

[0018] The advantages of this utility model are:

[0019] 1) The distributor pipe has several spray holes, which can spray refrigerant at different positions of the pipe section, so that the sensible heat exchange pipe section and the subcooled heat exchange pipe section can fully contact the refrigerant, increase the effective utilization rate of the heat exchange pipe, reduce the resistance of the refrigerant, accelerate the flow, reduce the probability of forming an oil film on the heat exchange pipe, and thus increase the overall cooling capacity of the evaporator.

[0020] 2) Using distributors installed in different orientations can prevent refrigerant misflow and improve heat exchange efficiency.

[0021] 3) By utilizing the structural combination of the oil storage chamber and the oil return pipe, the accumulated refrigerant can be returned to the compressor through the oil return pipe, ensuring the oil balance in and out of the compressor and avoiding problems caused by insufficient oil in the compressor. Attached Figure Description

[0022] Appendix Figure 1 This is a schematic diagram of a preferred embodiment of the present invention.

[0023] Appendix Figure 2 This is a cross-sectional view of a preferred embodiment of the present invention. Detailed Implementation

[0024] The present invention will now be further described with reference to the accompanying drawings.

[0025] According to the appendix Figures 1 to 2 As shown, this novel falling film evaporator includes a heat exchange shell 1 for storing refrigerant and heat exchange tubes 2 for the flow and heat exchange of the refrigerant. The heat exchange shell 1 has a heat exchange inner cavity 11, and the heat exchange tubes 2 are installed in the heat exchange inner cavity 11. The bottom of the heat exchange shell 1 has an oil storage chamber 12, which is equipped with a refrigerant inlet pipe 4 for supplying refrigerant and a distributor pipe 3 for spraying refrigerant onto the heat exchange tubes 2 at different locations. The outlet of the refrigerant inlet pipe 4 is connected to the oil storage chamber 12, and the inlet of the distributor pipe 3 is also connected to the oil storage chamber 12. The distributor pipe 3 has several spray holes 31 that communicate with the heat exchange inner cavity 11. The upper end of the heat exchange inner cavity 11 is connected to a refrigerant suction pipe 5.

[0026] In practical applications, the heat exchange cavity 11 includes a central tube 7, and the heat exchange tubes 2 are coiled from top to bottom around the outer wall of the central tube 7. Based on the characteristics of refrigerant condensation and evaporation, the heat exchange tubes 2 are configured with sensible heat exchange tube sections and subcooled heat exchange tube sections of equal pitch.

[0027] The heat exchange inner cavity 11 is equipped with several liquid distribution pipes 3, which extend upward from the oil storage cavity toward the subcooled heat exchange pipe section and the sensible heat exchange pipe section. The liquid spray holes 31 are evenly distributed on the subcooled heat exchange pipe section and the sensible heat exchange pipe section.

[0028] This evaporator structure has several spray holes 31 through the liquid distribution pipe 3, which can spray refrigerant at different positions of the pipe section. This allows the sensible heat exchange tube section and the subcooled heat exchange tube section of different heat exchange tube 2 to fully contact the refrigerant, increase the effective utilization rate of heat exchange tube 2, thereby increasing the overall cooling capacity of the evaporator. At the same time, it reduces the resistance of the refrigerant, accelerates its flow, reduces the probability of forming an oil film on the heat exchange tube 2, and improves the heat exchange efficiency of heat exchange tube 2.

[0029] Reference Figures 1 to 2 As shown in the figure, in further detail, the heat exchange tube 2 is connected to a medium inlet tube 8 and a medium outlet tube 9, which are diagonally distributed on the heat exchange shell 1.

[0030] Furthermore, the heat exchange inner cavity 11 is equipped with a plurality of liquid distribution pipes 3, and the liquid inlets of the plurality of liquid distribution pipes 3 are located on the same horizontal plane of the oil storage cavity 12.

[0031] During operation, refrigerant enters the oil storage chamber 12 through the refrigerant inlet pipe. Since the inlets of several distribution pipes 3 are located at the same horizontal level in the oil storage chamber 12, the refrigerant flows through the distribution pipes to spray onto the sensible heat exchanger sections and subcooled heat exchanger sections at different locations within the heat exchange chamber 11, releasing heat during vaporization and condensation. Meanwhile, water enters the heat exchanger tube 2 through the medium inlet pipe 8. The water in the heat exchanger tube 2 is heated by fully utilizing the sensible and latent heat of the refrigerant, and the resulting hot water is discharged through the medium outlet pipe 9. During this process, vaporized refrigerant can be discharged from the refrigerant suction pipe 5 towards the compressor.

[0032] By using several liquid distribution pipes 3 distributed in different directions, refrigerant flow deviation can be avoided, thus improving heat exchange efficiency.

[0033] Reference Figures 1 to 2 As shown, in further detail, the oil storage chamber 12 is located at the bottom of the central tube 7, and the refrigerant inlet pipe 4 is installed at the top center of the heat exchange outer shell, with the inlet of the refrigerant inlet pipe 4 connected to an external refrigerant supply source.

[0034] Furthermore, the bottom of the heat exchange shell 1 is provided with an oil return pipe 6, the inlet of the oil return pipe 6 is connected to the oil storage chamber 12, and the outlet of the oil return pipe 6 is connected to the compressor.

[0035] By utilizing the structural cooperation between the oil storage chamber 12 and the oil return pipe 6, the accumulated refrigerant oil can be returned to the compressor through the oil return pipe 6, ensuring the oil balance between the compressor's inlet and outlet and avoiding problems caused by insufficient oil in the compressor.

[0036] The above specific embodiments are only specific implementations of the present utility model with better effects. All structures that are the same as or equivalent to the novel falling film evaporator of the present utility model are within the protection scope of the present utility model.

Claims

1. A novel falling film evaporator, comprising a heat exchange shell (1) for storing refrigerant and heat exchange tubes (2) for heat exchange of the medium, wherein the heat exchange shell (1) has a heat exchange cavity (11), and the heat exchange tubes (2) are installed in the heat exchange cavity (11), characterized in that: The bottom of the heat exchange shell (1) is provided with an oil storage chamber (12). The oil storage chamber (12) is provided with a refrigerant inlet pipe (4) for supplying refrigerant and a liquid distribution pipe (3) for spraying refrigerant onto heat exchange tubes (2) at different positions. The outlet of the refrigerant inlet pipe (4) is connected to the oil storage chamber (12), and the inlet of the liquid distribution pipe (3) is connected to the oil storage chamber (12). The liquid distribution pipe (3) is provided with several spray holes (31) that are connected to the heat exchange inner cavity (11). The upper end of the heat exchange inner cavity (11) is connected to a refrigerant suction pipe (5).

2. The new falling film evaporator as claimed in claim 1, wherein: The bottom of the heat exchange shell (1) is provided with an oil return pipe (6), the inlet of the oil return pipe (6) is connected to the oil storage chamber (12), and the outlet of the oil return pipe (6) is connected to a compressor.

3. The new falling film evaporator as claimed in claim 1, wherein: The heat exchange inner cavity (11) includes a central tube (7) and the heat exchange tube (2) is coiled from top to bottom around the outer wall of the central tube (7) so that the heat exchange tube (2) forms sensible heat exchange tube sections and subcooled heat exchange tube sections with equal pitch.

4. The new falling film evaporator as claimed in claim 3, wherein: The heat exchange inner cavity (11) is equipped with several liquid distribution pipes (3). The liquid distribution pipes (3) extend upward from the oil storage cavity in sequence towards the subcooled heat exchange pipe section and the sensible heat exchange pipe section. The liquid spray holes (31) are distributed at equal intervals on the subcooled heat exchange pipe section and the sensible heat exchange pipe section.

5. The new falling film evaporator as claimed in claim 3, wherein: The oil storage chamber (12) is located at the bottom of the central tube (7), and the refrigerant inlet pipe (4) is installed at the top center of the heat exchange outer shell, with the inlet of the refrigerant inlet pipe (4) connected to an external refrigerant supply source.

6. The new falling film evaporator as claimed in claim 1, wherein: The liquid inlet of the liquid distribution pipe (3) and the liquid outlet of the refrigerant liquid inlet pipe (4) are located at the bottom of the oil storage chamber (12).

7. The new falling film evaporator as claimed in claim 1, wherein: The heat exchange chamber (11) is equipped with several liquid distribution pipes (3), and the liquid inlets of the several liquid distribution pipes (3) are located on the same horizontal plane of the oil storage chamber (12).

8. The new falling film evaporator as claimed in claim 1, wherein: The heat exchange tube (2) is connected to a medium inlet tube (8) and a medium outlet tube (9), which are diagonally distributed on the heat exchange shell (1).

Images