High efficiency refrigeration system

Abstract

A high-efficiency refrigeration system comprises a falling-film evaporator, a distributor is installed in the falling-film evaporator, a plurality of upper and lower rows of horizontal heat pipe rows are installed right below the distributor, a gas collecting pipe is installed on the top wall of the falling-film evaporator, the distal end of the gas collecting pipe is connected to a compressor, the distributor sprays liquid refrigerant onto one horizontal heat pipe row, the horizontal heat pipe row divides the liquid refrigerant into the next horizontal heat pipe row, and the spraying is performed in this way row by row; each heat pipe evaporates the liquid refrigerant into low-pressure refrigerant vapor, the gas collecting pipe collects the low-pressure refrigerant vapor and sends it to the compressor, the heat pipes in the upper and lower rows of horizontal heat pipe rows are arranged in a slanting direction to form left and right rows of slanting heat pipe rows, and a gap is left between each left and right adjacent two slanting heat pipe rows; a plurality of air injection heads are installed in the falling-film evaporator, the air injection heads are respectively connected to the gas collecting pipe and the compressor exhaust pipe to respectively obtain low-pressure and high-pressure refrigerant vapors for mixing, and then are respectively aimed at the gaps for spraying.

Description

Technical Field

[0001] This invention relates to the field of refrigeration systems. Background Technology

[0002] like Figure 1 As shown, the existing refrigeration system includes a falling film evaporator 1. A liquid inlet pipe 2 is installed on the outer top wall of the falling film evaporator 1, and a distributor 3 is installed on the inner top wall, with the top of the distributor 3 connected to the bottom end of the liquid inlet pipe 2. Below the distributor 3 are multiple rows of horizontal heat pipes 4, each containing a heating medium that supplies heat to the heat pipes 4. Liquid refrigerant 13 flows into the distributor 3 through the liquid inlet pipe 2, is sprayed by the distributor 3 onto the top walls of each heat pipe 4 in the top row of heat pipes, is blocked by the heat pipes 4, splits into two streams flowing to the next row of heat pipes, and then falls, wetting the other horizontal heat pipe rows 60 one by one, finally being discharged and recycled through the liquid outlet pipe 5. A liquid outlet pipe 5 is installed on the outer bottom wall of the falling film evaporator 1, and a gas collecting pipe 11 is installed on the outer top wall, with the distal end of the gas collecting pipe 11 connected to the compressor 10. Figure 2 As shown, when liquid refrigerant 13 flows on heat pipe 4, it forms a liquid film 6 on heat pipe 4. The liquid film 6 surrounds heat pipe 4 and evaporates into low-pressure refrigerant vapor 9 when heated. The low-pressure refrigerant vapor 9 flows upward and to the right into the gas collecting pipe 11, and then into the compressor 10 where it is compressed for subsequent processes. Heat pipe 4 is a circular pipe, and the curvature of its bottom wall is insufficient to allow the liquid film 6 to flow to the center 50 of the bottom wall. Therefore, the center 50 of the bottom wall cannot exchange heat with the liquid film 6, resulting in low heat exchange efficiency of heat pipe 4. Summary of the Invention

[0003] The present invention aims to provide a high-efficiency refrigeration system that allows heat exchange between the center of the bottom wall of the heat pipe and the liquid film, thereby improving the heat exchange efficiency of the heat pipe.

[0004] The high-efficiency refrigeration system includes a falling film evaporator, which contains a distributor. Below the distributor are multiple rows of horizontal heat pipes. A vapor collector is mounted on the top wall of the falling film evaporator, with its distal end connected to the compressor. The distributor sprays liquid refrigerant onto one row of horizontal heat pipes, which then distributes the liquid refrigerant to the next row, continuing this process row by row. Each heat pipe evaporates the liquid refrigerant into low-pressure refrigerant vapor, which is collected by the vapor collector. The refrigerant vapor is sent to the compressor, which compresses the low-pressure refrigerant vapor into high-pressure refrigerant vapor and discharges it through its own exhaust pipe. The heat pipes in the upper and lower multi-row horizontal heat pipe rows are arranged at an angle to form left and right multi-row oblique heat pipe rows, with a gap between each pair of adjacent left and right oblique heat pipe rows. The falling film evaporator is equipped with multiple jet nozzles, which are connected to the gas collecting pipe and the compressor exhaust pipe to obtain low-pressure and high-pressure refrigerant vapors respectively for mixing, and then spraying them out at the multiple gaps.

[0005] Furthermore, in the two adjacent horizontal heat pipe rows, there is a gap between each pair of left and right adjacent heat pipes in the upper horizontal heat pipe row, and the width of each gap is smaller than the diameter of the heat pipe; each heat pipe in the lower horizontal heat pipe row is located directly below the gap.

[0006] Furthermore, it includes an expansion valve and a condenser, wherein the compressor discharge pipe is connected to the condenser, the condenser is connected to the expansion valve, and the expansion valve is connected to a falling film evaporator.

[0007] Furthermore, the air outlet of the jet head is offset from the liquid outlet of the separator.

[0008] The beneficial effects are:

[0009] 1. As the liquid refrigerant falls from the top row of horizontal heat pipes to the next row of horizontal heat pipes, it passes through the gaps; the jet nozzle mixes the low-pressure and high-pressure refrigerant vapors into a reusable refrigerant vapor, which is then sprayed obliquely upwards by the jet nozzle into the multiple gaps. For example, such as... Figure 4 As shown, the liquid refrigerant 13 falling onto the first heat pipe 80 is obstructed and then splits into two, falling in two. It is then sprayed by the nozzle 16 into a mist. After the refrigerant mist forms, it is carried upwards and to the left by the reused refrigerant vapor 24, covering the center 50 of the bottom wall of the second heat pipe 90 diagonally above, thus forming a liquid film 6. The center 50 of the bottom wall of the second heat pipe 90 can then exchange heat with the liquid film 6. Similarly, the center 50 of the bottom wall of the other heat pipes 4 can also exchange heat with the liquid film 6, thus improving the heat exchange efficiency of the heat pipes 4.

[0010] 2. The jet nozzle sprays refrigerant vapor into the gap. The resulting refrigerant vapor flow disturbs the water film on the heat pipe, causing the water film to change from laminar flow to turbulent flow. This increases the heat transfer coefficient of the water film, and consequently improves the heat transfer efficiency of the heat pipe.

[0011] 3. The jet nozzle's jet direction avoids all heat pipes, so the refrigerant vapor will not be sprayed directly onto the heat pipes, making it easier for a water film to form on the heat pipes.

[0012] 4. The refrigerant vapor ejected from the jet head is recovered from the falling film evaporator, which does not introduce impurities and protects the compressor. Attached Figure Description

[0013] Figure 1 This is a longitudinal section view of an existing refrigeration system, which only shows the falling film evaporator and compressor.

[0014] Figure 2 yes Figure 1 A magnified view of point A;

[0015] Figure 3This is a longitudinal sectional view of the refrigeration system of the present invention. Only the falling film evaporator and the compressor of the refrigeration system are shown in the figure.

[0016] Figure 4 yes Figure 3 A magnified view of point B;

[0017] In the diagram: 1. Falling film evaporator; 2. Liquid inlet pipe; 3. Liquid distributor; 4. Heat pipe; 5. Liquid outlet pipe; 6. Liquid film; 8. Liquid droplet; 9. Low-pressure refrigerant vapor; 10. Compressor; 11. Vapor collector; 12. Liquid baffle plate; 13. Liquid refrigerant; 16. Jet nozzle; 17. Gap; 18. Exhaust pipe; 19. High-pressure recovery branch pipe; 20. Pressure regulating valve; 21. Low-pressure recovery branch pipe; 22. Check valve; 23. Vertical pipe; 24. Recycled refrigerant vapor; 30. Angled heat pipe array; 50. Central section; 60. Horizontal heat pipe array; 80. First heat pipe; 90. Second heat pipe; 100. Third heat pipe. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to specific embodiments.

[0019] like Figure 3 As shown, the refrigeration system of the present invention includes a falling film evaporator 1. A liquid inlet pipe 2 is installed at the top of the falling film evaporator 1, and the bottom end of the liquid inlet pipe 2 connects to the inner cavity of the falling film evaporator 1. A distributor 3 is provided inside the falling film evaporator 1, and the distributor 3 is installed on the bottom end of the liquid inlet pipe 2. Below the distributor 3 are multiple rows of horizontal heat pipes 60, each row of heat pipes 60 containing multiple heat pipes 4. A heating medium flows within each heat pipe 4, supplying heat to the heat pipe 4. Liquid refrigerant 13 is fed into the distributor 3 through the liquid inlet pipe 2, and is sprayed by multiple outlets of the distributor 3 onto each heat pipe 4 of the top row of horizontal heat pipes 60. Most of the refrigerant is blocked by the corresponding heat pipe 4 and divided into two (see...). Figure 4 The liquid refrigerant 13 then falls and sprays onto the corresponding heat pipes 4 of the next row of horizontal heat pipe rows 60, spraying row by row in this manner. After spraying, the liquid refrigerant 13 falls onto the bottom wall of the falling film evaporator 1 and is discharged through the liquid outlet pipe 5 on the bottom wall of the falling film evaporator 1. The top wall of the falling film evaporator 1 is equipped with a gas collecting pipe 11, the inlet of which is equipped with a liquid baffle plate 12, and the outlet of the gas collecting pipe 11 is connected to a compressor 10. A small portion of the liquid refrigerant 13 sprayed onto the heat pipes 4 does not fall but forms a liquid film 6 on the heat pipes 4. The liquid film 6 evaporates when heated to produce low-pressure refrigerant vapor 9. The low-pressure refrigerant vapor 9 is filtered by the liquid baffle plate 12 and then collected by the gas collecting pipe 11 and sent to the compressor 10. The compressor 10 compresses the low-pressure refrigerant vapor 9 into high-pressure refrigerant vapor, which is then sent out through the exhaust pipe 18 of the compressor 10 to the condenser of the refrigeration system (not shown in the figure). The condenser is connected to an expansion valve (not shown in the figure), which is connected to the liquid inlet pipe 2 of the falling film evaporator 1.

[0020] The heat pipes 4 in the aforementioned horizontal heat pipe array 60 are arranged diagonally to form multiple rows of diagonal heat pipe arrays 30 on the left and right, with a gap 17 between each pair of adjacent diagonal heat pipe arrays 30 on the left and right. A falling film evaporator 1 contains a vertical pipe 23, on which multiple jet nozzles 16 are mounted, each aligned with one of the gaps 17. The top of the vertical pipe 23 is equipped with two recovery branches 21 and 19, one for low pressure and one for high pressure. The high-pressure recovery branch 19 connects to the exhaust pipe 18 of the compressor 10, recovering high-pressure refrigerant vapor and supplying it to the vertical pipe 23; the low-pressure recovery branch 21 connects to the gas collecting pipe 11, recovering low-pressure refrigerant vapor 9 and supplying it to the vertical pipe 23. A check valve 22 is installed on the low-pressure recovery branch 21 to prevent high-pressure refrigerant vapor in the vertical pipe 23 from flowing into the low-pressure recovery branch 21. The vertical pipe 23, after adjusting the pressure of the recovered high-pressure refrigerant vapor via the pressure regulating valve 20, mixes it with the recovered low-pressure refrigerant vapor 9 to form a reusable refrigerant vapor 24 with suitable pressure. The reusable refrigerant vapor 24 is then ejected through the nozzle 16 into the gap 17. Liquid refrigerant 13 falling from the side wall of the first heat pipe 80 is sprayed and atomized, then carried by the reusable refrigerant vapor 24 to move upwards and to the left, covering the center 50 of the bottom wall of the second heat pipe 90 diagonally above, forming a liquid film 6. This film is then collected by the gas collecting pipe 11 and sent to the compressor 10. The liquid films 6 on the second and third heat pipes 90 and 100 only condense into droplets 8 when they reach the center 50 of the bottom wall of the heat pipe 4, ensuring that the liquid film 6 covers the center 50 of the bottom wall of the heat pipe 4, allowing heat exchange between the center 50 and the liquid film 6. Similarly, the center 50 of the bottom wall of the other heat pipes 4 can also exchange heat with the liquid film 6, improving heat exchange efficiency.

[0021] like Figure 4 As shown, in the two adjacent horizontal heat pipe rows 60, there is a gap 17 between each pair of left and right adjacent heat pipes 4 in the upper horizontal heat pipe row 60, and the width of each gap is smaller than the diameter of the heat pipe 4; each heat pipe 4 in the lower horizontal heat pipe row 60 is located directly below the gap to receive the liquid refrigerant 13 flowing down through the gap. For example, there is a gap between the second heat pipe 90 and the heat pipe 4 to its right, and the first heat pipe 80 is located directly below the gap to receive the liquid refrigerant 13 flowing down through the gap.

[0022] The outlet of the jet nozzle 16 is offset from the outlet of the liquid distributor 3 (not shown in the figure). This prevents the jet nozzle 16 from directly spraying onto the outlet of the liquid distributor 3 and changing the falling direction of the liquid refrigerant 13. As a result, the liquid refrigerant 13 sprayed from each outlet of the liquid distributor 3 can fall vertically, ensuring that all the heat pipes 4 of the top horizontal heat pipe row 60 can be sprayed.

[0023] The above description is merely an embodiment of the present invention and does not limit the scope of patent protection. Any non-substantial changes or substitutions made by those skilled in the art based on the present invention will still fall within the scope of patent protection.

Claims

1. A high-efficiency refrigeration system, comprising a falling film evaporator, a distributor inside the falling film evaporator, and multiple rows of horizontal heat pipes arranged vertically below the distributor. A gas collecting pipe is installed on the top wall of the falling film evaporator, and the distal end of the gas collecting pipe is connected to a compressor. The distributor sprays liquid refrigerant onto one row of horizontal heat pipes, which then distributes the liquid refrigerant to the next row of horizontal heat pipes, and so on, spraying each row in turn. Each heat pipe evaporates the liquid refrigerant into low-pressure refrigerant vapor. The gas collecting pipe collects the low-pressure refrigerant vapor and sends it to the compressor. The compressor compresses the low-pressure refrigerant vapor into high-pressure refrigerant vapor and discharges it through its own exhaust pipe. The system is characterized by: The heat pipes in the upper and lower multi-row horizontal heat pipe rows are arranged at an angle to form left and right multi-row oblique heat pipe rows, with a gap between each two adjacent left and right oblique heat pipe rows; the falling film evaporator is equipped with multiple jet heads, which are respectively connected to the gas collecting pipe and the compressor exhaust pipe to obtain low-pressure and high-pressure refrigerant vapors for mixing, and then spraying them out at the multiple gaps respectively.

2. The high-efficiency refrigeration system as described in claim 1, characterized in that: In the two adjacent horizontal heat pipe rows, there is a gap between each pair of left and right adjacent heat pipes in the upper horizontal heat pipe row, and the width of each gap is smaller than the diameter of the heat pipe; each heat pipe in the lower horizontal heat pipe row is located directly below the gap.

3. The high-efficiency refrigeration system as described in claim 1, characterized in that: It includes an expansion valve and a condenser. The compressor discharge pipe is connected to the condenser, the condenser is connected to the expansion valve, and the expansion valve is connected to a falling film evaporator.

4. The high-efficiency refrigeration system as described in claim 1, characterized in that: The air outlet of the jet head is offset from the liquid outlet of the separator.

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