Efficient flooded evaporator

Abstract

The utility model discloses an efficient flooded evaporator. The efficient flooded evaporator comprises a barrel and a plurality of layers of heat exchange tubes, a tray is arranged between every two adjacent layers of heat exchange tubes; the tray is in a wave shape and comprises a plurality of adjacent grooves, the heat exchange tubes are wrapped in the grooves, and exhaust ports are further formed between the adjacent grooves. A refrigerant input pipeline extending upwards from the bottom to the interior of the cylinder is arranged in the cylinder; and an air outlet communicated to the inner cavity of the cylinder body is formed in the uppermost part of the cylinder body. Through simple structural improvement, a gas exhaust route in the evaporator cylinder cannot be in contact with the heat exchange tubes above, and the heat exchange efficiency of the heat exchange tubes above cannot be influenced, so that the heat exchange efficiency is improved, and refrigerant liquid brought out during refrigerant exhaust is effectively reduced; and in addition, the refrigerant is injected from the uppermost tray and is sequentially and downwards immersed in the lowermost heat exchange tube, and compared with a traditional flooded evaporator, the required refrigerant is less and safer.

Description

Technical Field

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

[0002] When a flooded evaporator is operating, cold water flows through the heat exchange tubes, completely submerging them. The refrigerant absorbs heat and then evaporates outside the tubes. The heat transfer surface is essentially in contact with the liquid refrigerant. The refrigerant charge in the shell is typically about 55% to 65% of the effective volume of the cylinder. The refrigerant absorbs heat, vaporizes, and then returns to the compressor through the liquid separator at the top of the cylinder.

[0003] Although the evaporator is easy to operate and manage and has a high heat transfer coefficient, the contact area between the heat exchange tube and the refrigerant directly affects its efficiency. After the refrigerant evaporates, the rising gas will inevitably hit the evaporation tube above, reducing its contact area with the refrigerant, thereby reducing the working efficiency of the evaporator.

[0004] Therefore, in order to address the issue of the impact of the rising refrigerant bubbles after evaporation on the contact area between the upper evaporator tube and the refrigerant, an improved and more efficient flooded evaporator is worth studying. Utility Model Content

[0005] Purpose of the utility model: In order to solve the problems existing in the prior art, the utility model provides a high-efficiency flooded evaporator, which effectively improves work efficiency.

[0006] Technical solution: To achieve the above purpose, the present invention can adopt the following technical solution: a high-efficiency flooded evaporator, comprising a cylinder and multiple layers of heat exchange tubes; trays are provided between adjacent layers of heat exchange tubes;

[0007] The tray is wavy and includes a plurality of adjacent grooves, the heat exchange tubes are wrapped in the grooves, and an exhaust port is provided between adjacent grooves;

[0008] A refrigerant input pipe is provided in the cylinder body, extending from the bottom upward to the inside of the cylinder body; a refrigerant inlet is provided at the bottom end of the refrigerant input pipe outside the cylinder body, the top end of the refrigerant input pipe is open, and the highest point is slightly higher than the uppermost heat exchange tube; a refrigerant outlet is provided at the top of the cylinder body, which is connected to the inner cavity of the cylinder body.

[0009] Furthermore, the two side edges of the tray are tilted outward, and the height of the exhaust port is set to be higher than the highest point of the tray to prevent refrigerant leakage from causing the rising speed of bubbles to decrease. When discharging gas, only a small amount of gas on the edge will pass through the liquid surface, and the remaining gas will not pass through the liquid surface again after leaving the liquid surface, thereby reducing the refrigerant liquid brought out.

[0010] Furthermore, the width of the tray increases from the upper layer to the lower layer, so that the refrigerant liquid in the upper layer overflows from both ends and flows into the tray of the lower layer after being filled.

[0011] Furthermore, the heat exchange tubes are arranged in the cylinder in the form of a multi-layer tube bundle, and are used to carry cold water for heat exchange with the refrigerant.

[0012] Furthermore, a gap is provided between the heat exchange tubes of each layer and the grooves of the tray below to ensure that the heat exchange tubes can achieve sufficient heat exchange.

[0013] Furthermore, the refrigerant is liquid, entering from the refrigerant inlet and flowing into the uppermost tray. After the uppermost tray is filled with liquid, it overflows from both ends and flows into the tray of the next layer, and so on.

[0014] Furthermore, after the refrigerant below the tray evaporates, the gas moves upward. After contacting the tray's grooves, it moves upward along the arc at the tray's bottom, converges at the junction of adjacent grooves, and is discharged upward from the exhaust port. It then leaves the tray and is discharged to both sides, traveling upward along the interior of the cylinder, and is discharged from the outlet. This gas exhaust route does not contact the heat exchange tubes above, thereby not affecting the operating efficiency of the upper heat exchange tubes, thereby improving the operating efficiency of the flooded evaporator.

[0015] Furthermore, the material of the tray does not react with the refrigerant.

[0016] Beneficial effects: The utility model has the following advantages:

[0017] The utility model has undergone simple structural improvements. The gas discharge route in the evaporator cylinder will not touch the heat exchange tube above, and will not affect the working efficiency of the heat exchange tube above, thereby improving the working efficiency; and effectively avoids the leakage of refrigerant. When the gas is discharged, only a small amount on the edge will pass through the liquid surface, and the remaining gas will not pass through the liquid surface again after leaving the liquid surface, thereby reducing the refrigerant liquid brought out. The refrigerant is injected from the top tray and goes down in sequence until the bottom heat exchange tube is immersed. Compared with the traditional flooded evaporator, less refrigerant is required and it is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic cross-sectional view of the structure of a high-efficiency flooded evaporator according to Example 1 of the present utility model;

[0019] Figure 2 This is a schematic structural diagram of a high-efficiency flooded evaporator according to Example 1 of the present utility model;

[0020] Figure 3 This is a schematic diagram of the partial structure of the groove and exhaust port of the tray in Example 1 of the present utility model;

[0021] Figure 4This is a schematic diagram of the refrigerant gas discharge method of the exhaust port of the tray in Example 1 of the utility model. DETAILED DESCRIPTION

[0022] Example 1:

[0023] See also Figure 1-2 As shown, the utility model discloses a high-efficiency flooded evaporator, comprising a cylinder 1, a water inlet 11, a water outlet 12 and multiple layers of heat exchange tubes 2; a tray 3 is provided between adjacent layers of heat exchange tubes 2;

[0024] Please refer to Figure 3 As shown, the tray 3 is wavy and includes a plurality of adjacent grooves. The heat exchange tubes 2 are wrapped in the grooves, and an exhaust port 31 is provided between adjacent grooves. The two side edges of the tray 3 are inclined outward, and the height of the exhaust port 31 is set to be higher than the highest point of the tray 3 to prevent the refrigerant from leaking and causing the rising speed of the bubbles to decrease. When the gas is discharged, only a small amount on the edge will pass through the liquid surface, and the remaining gas will not pass through the liquid surface again after leaving the liquid surface, thereby reducing the refrigerant liquid brought out.

[0025] The width of the tray 3 increases from the upper layer to the lower layer, so that the refrigerant liquid in the upper layer overflows from both ends and flows into the tray 3 of the next layer. Figure 1 Indicated by the arrow direction.

[0026] The heat exchange tubes 2 are arranged in a multi-layered bundle within the cylinder 1, carrying cold water for heat exchange with the refrigerant. A certain gap is provided between each layer of heat exchange tubes 2 and the grooves of the underlying tray 3 to ensure sufficient heat exchange. The tray 3 is also made of a material that is non-reactive with the refrigerant.

[0027] A refrigerant input pipe 4 is provided in the cylinder 1, extending from the bottom upward to the inside of the cylinder; a refrigerant inlet 41 is provided at the bottom end of the refrigerant input pipe 4 outside the cylinder 1, and the top end of the refrigerant input pipe 4 is open, and the highest point is slightly higher than the uppermost heat exchange tube 2; a refrigerant outlet 5 connected to the inner cavity of the cylinder 1 is provided at the top of the cylinder 1.

[0028] Working process:

[0029] The refrigerant is a liquid, which enters from the refrigerant inlet 41 on the outside of the bottom end of the cylinder 1 and flows into the top tray 3. After the top tray 3 is filled with liquid, it overflows from both ends and flows into the next tray 3, and so on. Cold water flows in the heat exchange tube 2; when the evaporator is working, the refrigerant under the tray 3 evaporates and the gas moves upward. After contacting the groove of the tray 3, it moves upward along the arc at the bottom of the tray 3, gathers at the connection of adjacent grooves, and is discharged upward from the exhaust port 31, and then leaves the tray 3 to be discharged to both sides, upward along the inside of the cylinder 1, and discharged from the outlet 5. Such a gas discharge route will not contact the heat exchange tube above, and will not affect the working efficiency of the heat exchange tube above, thereby improving the working efficiency of the full liquid evaporator. The groove and exhaust port design of the tray 3; when discharging the gas, only a small amount on the edge will pass through the liquid surface, and the remaining gas will not pass through the liquid surface again after leaving the liquid surface, thereby reducing the refrigerant liquid brought out. For details, please refer to Figure 3-4 As shown in the diagram, escaping refrigerant gas only comes into contact with the small amount of liquid at the top of the refrigerant liquid surface. Refrigerant is injected from the top tray and flows downward until it submerges the bottom heat exchange tube. Compared to traditional flooded evaporators, this requires less refrigerant and is safer.

[0030] The utility model has a simple structural improvement, and the gas discharge route in the evaporator cylinder will not contact the upper heat exchange tube, and will not affect the working efficiency of the upper heat exchange tube, thereby improving the working efficiency.

Claims

1. A high-efficiency flooded evaporator, characterized by: It comprises a cylinder (1) and multiple layers of heat exchange tubes (2); a tray (3) is provided between adjacent layers of heat exchange tubes (2); The tray (3) is wavy and includes a plurality of adjacent grooves, the heat exchange tubes (2) are wrapped in the grooves, and an exhaust port (31) is provided between adjacent grooves; The cylinder (1) is provided with a refrigerant input pipe (4) extending from the bottom upward to the inside of the cylinder; the refrigerant input pipe (4) is provided with a refrigerant inlet (41) at the bottom end outside the cylinder (1); the top end of the refrigerant input pipe (4) is open, and the highest point is higher than the uppermost heat exchange tube (2); the top of the cylinder (1) is provided with a refrigerant outlet (5) connected to the inner cavity of the cylinder (1).

2. The high-efficiency flooded evaporator according to claim 1, characterized in that: Both sides of the tray (3) are tilted outwards, and the height of the exhaust port (31) is set higher than the highest point of the tray.

3. The high-efficiency flooded evaporator according to claim 1, characterized in that: The width of the tray (3) increases sequentially from the upper layer to the lower layer.

4. The high-efficiency flooded evaporator according to claim 1, characterized in that: The heat exchange tubes (2) are arranged in the cylinder in the form of a multi-layer tube bundle and are used to carry cold water for heat exchange with the refrigerant.

5. The high-efficiency flooded evaporator according to claim 1, characterized in that: A gap is provided between the heat exchange tubes (2) of each layer and the grooves of the tray (3) below.

6. The high-efficiency flooded evaporator according to claim 1, characterized in that: The refrigerant is liquid and enters from the refrigerant inlet (41) and flows into the uppermost tray (3). After the uppermost tray (3) is filled with liquid, it overflows from both ends and flows into the lower tray (3), and so on.

7. The high-efficiency flooded evaporator according to claim 1, characterized in that: After the refrigerant below the tray (3) evaporates, the gas moves upward, contacts the groove of the tray (3), moves upward along the arc at the bottom of the tray (3), gathers at the connection of adjacent grooves, and is discharged upward from the exhaust port (31), then leaves the tray (3) and is discharged to both sides, moves upward along the inside of the cylinder (1), and is discharged from the outlet port (5).

8. The high-efficiency flooded evaporator according to claim 1, characterized in that: The material of the tray (3) does not react with the refrigerant.

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