Falling film evaporator and water chilling unit

Abstract

The falling film evaporator comprises a shell, an evaporation pipe set, a heat exchange pipe set and a liquid blocking assembly, the liquid blocking assembly comprises a liquid blocking plate and a ventilation plate, the first end of the liquid blocking plate is connected with the inner wall of the shell, and a circulation gap is formed between the second end of the liquid blocking plate and the heat exchange pipe set; the ventilation plate is located above the circulation gap to shield the circulation gap, gas evaporated through the heat exchange pipe set and the evaporation pipe set rises along the inner side wall of the shell and makes contact with the liquid baffle, and liquid in the gas falls under the gravity effect through the turbulent flow effect of the liquid baffle. And the separated gas passes through the circulation gap and is finally discharged through the vent holes in the vent plate, so that the content of liquid in the evaporated gas can be reduced, and the probability of abnormal operation of the compressor is further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of heat exchange, in particular to a falling film evaporator and a water chiller. BACKGROUND

[0002] The falling film evaporator is a commonly used evaporator form of the water chiller at present. Generally, the lower part of the evaporator is a full-liquid zone, and the upper part is a falling film zone. The throttled two-phase refrigerant is sprayed from the upper part of the falling film zone, flows on the heat exchange tube in the falling film zone to form a liquid film and evaporates heat exchange, the unevaporated liquid flows through the falling film zone and drops to the full-liquid zone to supplement the liquid in the full-liquid zone to form pool boiling evaporation heat exchange, and the evaporated gas in the falling film zone and the full-liquid zone is collected to the two sides of the falling film zone and flows upward to the suction port of the compressor. However, the evaporated gas will carry a small amount of unevaporated liquid in the process of rising, and the gas with the liquid will affect the normal operation of the compressor. CONTENT OF THE UTILITY MODEL

[0003] The present application provides a falling film evaporator and a water chiller, which can reduce the content of liquid in the gas at the suction port, thereby reducing the probability of abnormal operation of the compressor.

[0004] The present application provides a falling film evaporator, which comprises:

[0005] A shell is formed with a heat exchange cavity and a gas outlet pipe communicating with the heat exchange cavity;

[0006] An evaporation tube group is arranged in the heat exchange cavity;

[0007] A heat exchange tube group is arranged in the heat exchange cavity and located above the evaporation tube group; and

[0008] A liquid blocking assembly is arranged in the heat exchange cavity, the liquid blocking assembly is located above the evaporation tube group and located at the side of the heat exchange tube group, the liquid blocking assembly comprises a liquid blocking plate and an air passage plate, a first end of the liquid blocking plate is connected to the inner wall of the shell, a second end of the liquid blocking plate has a flow gap with the heat exchange tube group, the air passage plate is located above the flow gap to shield the flow gap, and the air passage plate is provided with an air passage hole.

[0009] Further, the liquid blocking plate is arranged in the horizontal direction.

[0010] Further, the liquid blocking assembly is provided with two groups, the two groups of liquid blocking assemblies are arranged in a first horizontal direction and located at the two sides of the heat exchange tube group respectively, and the first horizontal direction is perpendicular to the length direction of the shell.

[0011] Further, a first end of the air passage plate is connected to the liquid baffle plate, and a distance between the first end of the air passage plate and a second end of the liquid baffle plate along the first horizontal direction is W1, and a distance between the first end of the air passage plate and the heat exchange tube group along the first horizontal direction is W2, wherein 0 < W1 < (3W2) / 4.

[0012] Further, a distance between the flow-through gaps along the first horizontal direction is W3, wherein 20mm ≤ W3 ≤ 500mm.

[0013] Further, the air passage plate comprises:

[0014] an air passage plate body disposed above the liquid baffle plate and provided with the air passage holes; and

[0015] a baffle plate having one end connected to the heat exchange tube group and the other end connected to the air passage plate body.

[0016] Further, the baffle plate is disposed along a horizontal direction.

[0017] Further, a distance between the two ends of the baffle plate along a second horizontal direction is W4, and a distance between the flow-through gaps along the second horizontal direction is W3, wherein W4 ≤ W3, and the second horizontal direction is perpendicular to the length direction of the shell.

[0018] Further, an included angle between the air passage plate body and the horizontal direction is α, wherein 0° < α < 180°.

[0019] Further, a total area of the orifices of the plurality of air passage holes on the air passage plate body is a, and a surface area of one side of the air passage plate body provided with the orifices of the air passage holes is b, wherein (1b) / 20 ≤ a ≤ (3b) / 4.

[0020] Further, projections of the air outlet pipe on the first plane and projections of the air passage holes on the first plane are arranged at intervals along the length direction of the shell, and the first plane is parallel to the side of the air passage plate body facing the air outlet pipe.

[0021] The second aspect of the present application provides a water chiller, comprising:

[0022] a compressor;

[0023] a condenser; and

[0024] The falling film evaporator as any one of the above, the compressor, the condenser and the falling film evaporator are sequentially communicated to form a heat exchange loop.

[0025] The falling film evaporator and the water chilling unit provided by the embodiment of the application include an evaporation pipe group, a heat exchange pipe group and a liquid blocking assembly, the liquid blocking assembly includes a liquid blocking plate and a ventilation plate, the first end of the liquid blocking plate is connected to the inner wall of the shell, the second end of the liquid blocking plate is provided with a flow gap between the heat exchange pipe group, the ventilation plate is located above the flow gap to shield the flow gap, the gas evaporated through the heat exchange pipe group and the evaporation pipe group rises along the inner wall of the shell and contacts the liquid blocking plate, the liquid in the gas is separated under the action of the liquid blocking plate and the gravity, and the separated gas is finally discharged through the ventilation hole on the ventilation plate through the flow gap, so that the content of the liquid in the evaporated gas can be reduced, and the probability of abnormal operation of the compressor can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0027] Figure 1 FIG. 1 is a sectional structure schematic diagram of the falling film evaporator in an embodiment of the application;

[0028] Figure 2 FIG. 4 is a structure schematic diagram of the ventilation plate body in an embodiment of the application. BRIEF DESCRIPTION OF DRAWINGS:

[0030] 100, shell; 100a, heat exchange cavity; 101, gas outlet pipe;

[0031] 200, evaporation pipe group;

[0032] 300, heat exchange pipe group; 301, gas blocking plate;

[0033] 400, liquid blocking assembly; 400a, flow gap; 410, liquid blocking plate; 420, ventilation plate; 420a, ventilation hole; 421, ventilation plate body; 422, blocking plate;

[0034] XX, first horizontal direction. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the application more clear, the following will further describe the application in combination with the drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the application, and are not used to limit the application.

[0036] The embodiment of the present application provides a water chiller, which generates chilled water through an internal refrigeration system, removes heat of a device to be cooled by circulating chilled water, and achieves a cooling purpose. The water chiller is widely applied in central air conditioning systems, industrial cooling, food processing, medical treatment and other fields.

[0037] The water chiller in the embodiment of the present application will be further described below, which comprises a compressor, a condenser, a falling-film evaporator and a throttling assembly. The compressor, the condenser and the falling-film evaporator are sequentially communicated to form a heat exchange loop.

[0038] In the water chiller, a refrigeration mode is mainly used. In the refrigeration mode, the compressor outputs high-temperature and high-pressure gaseous refrigerant, which is transmitted to the condenser and changes into high-pressure and normal-temperature liquid refrigerant after condensation heat exchange. The high-pressure and normal-temperature liquid refrigerant is further transmitted to the throttling assembly and changes into low-temperature and low-pressure gas-liquid mixed refrigerant after throttling pressure reduction. Then, the low-temperature and low-pressure gas-liquid mixed refrigerant enters the falling-film evaporator and changes into low-temperature and low-pressure gaseous refrigerant after evaporation heat exchange. Finally, the low-temperature and low-pressure gaseous refrigerant flows back to the compressor, and a complete refrigeration cycle is completed.

[0039] The falling-film evaporator is a commonly used evaporator form of the water chiller at present. Generally, the lower part of the evaporator is a full-liquid zone, and the upper part is a falling-film zone. The throttled two-phase refrigerant is sprayed from the upper part of the falling-film zone, flows on the heat exchange tube of the falling-film zone to form a liquid film and evaporates and exchanges heat. The unevaporated liquid flows through the falling-film zone and drops to the full-liquid zone to supplement the liquid in the full-liquid zone, and forms pool boiling evaporation heat exchange. The evaporated gas of the falling-film zone and the full-liquid zone is collected to the two sides of the falling-film zone, flows upward through the liquid blocking plate to the suction port of the compressor. However, the evaporated gas will take a small amount of unevaporated liquid in the process of rising, and the gas with liquid will affect the normal operation of the compressor.

[0040] To solve the above problems, please refer to Figure 1 The falling-film evaporator in the embodiment of the present application comprises a shell 100, an evaporation tube group 200, a heat exchange tube group 300 and a liquid blocking assembly 400.

[0041] The shell 100 is a main structure of the evaporator. The shell 100 provides a closed and pressure-resistant heat exchange cavity 100a, ensures that the evaporation process is carried out in a safe and stable environment, and is usually made of corrosion-resistant and high-temperature-resistant alloy steel or stainless steel to adapt to various harsh working conditions.

[0042] The heat exchange cavity 100a formed inside the shell 100 is the main area where the heat exchange process occurs. Meanwhile, the shell 100 is also provided with an air outlet pipe 101 and an inlet. The air outlet pipe 101 is used to timely discharge the high-temperature gas generated after evaporation, so as to maintain the stable pressure in the heat exchange cavity 100a. The inlet is used to receive the refrigerant of the throttling assembly. In addition, the shell 100 can be equipped with an observation window, a pressure gauge, a thermometer and other accessories, so as to enable the operator to monitor the running state of the evaporator in real time.

[0043] The evaporation pipe group 200 is arranged in the heat exchange cavity 100a and can also be referred to as a flooded zone. The heat exchange pipes in the flooded zone are immersed in the refrigerant (also referred to as a coolant). The heat medium in the heat exchange pipes exchanges heat with the refrigerant outside the heat exchange pipes, so that the temperature of the refrigerant approaches the evaporation temperature. The heat medium can be hot water or hot steam. In the embodiment of the present application, hot water is exemplarily described.

[0044] The heat exchange pipe group 300 is arranged in the heat exchange cavity 100a and can also be referred to as a falling film zone. The falling film zone is located at the upper end of the evaporation pipe group 200. The two-phase refrigerant entering through the inlet forms a thin liquid film along the outer wall of the heat exchange pipe at this place through the distributor (also referred to as a liquid distribution structure or a liquid distribution device), and flows downward along the pipe wall. Since the contact area between the liquid film and the pipe wall is large and the thickness of the liquid film is small, high-efficiency heat exchange and evaporation can be achieved.

[0045] The water in the heat exchange pipe transfers heat to the liquid film through the pipe wall. The heat transfer causes the liquid in the liquid film to evaporate. As the liquid film flows downward, the gas generated by evaporation gradually separates from the unevaporated liquid. The evaporated gas is discharged from the air outlet pipe 101 of the evaporator, and the unevaporated liquid falls into the flooded zone below under the action of gravity.

[0046] The liquid blocking assembly 400 is arranged in the heat exchange cavity 100a. The liquid blocking assembly 400 is located above the evaporation pipe group 200 and is located at the side of the heat exchange pipe group 300. The liquid blocking assembly 400 includes a liquid blocking plate 410 and an air passage plate 420. The first end of the liquid blocking plate 410 is connected to the inner wall of the shell 100. The second end of the liquid blocking plate 410 has a flow gap 400a between the liquid blocking plate 410 and the heat exchange pipe group 300. The air passage plate 420 is located above the flow gap 400a to shield the flow gap 400a. The air passage plate 420 is provided with an air passage hole 420a.

[0047] Thus, the gas evaporated in the evaporating tube group 200 and the gas in the heat exchanging tube group 300 can mostly rise along the side wall of the shell 100. Since the gas contains liquid, when passing through the liquid blocking plate 410, the path of the gas can be changed, and the liquid droplets can be attached to the liquid blocking plate 410 and gathered into large droplets when falling along the liquid blocking plate 410. Finally, the gas flows along the liquid blocking plate 410, passes through the flow gap 400a, and reaches the upper side of the liquid blocking plate 410, and then passes through the air hole 420a and the gas outlet tube 101 to leave the evaporator and return to the compressor.

[0048] In this process, since the liquid in the evaporated gas is blocked by the liquid blocking plate 410, the liquid-carrying rate of the refrigerant can be reduced, and thus the liquid-carrying part of the refrigerant entering the compressor can be further reduced, the probability of abnormal operation of the compressor can be reduced, and thus the working efficiency of the compressor can be improved.

[0049] Please refer to Figure 1 In an embodiment of the present application, the liquid blocking plate 410 is arranged in a horizontal direction, and the impact area of the liquid blocking plate 410 facing the evaporated gas is larger than that of an inclined or vertical arrangement, that is, when the evaporated gas rises and collides with the liquid blocking plate 410, more evaporated gas molecules can contact the surface of the liquid blocking plate 410.

[0050] In addition, since the liquid blocking plate 410 is arranged in a horizontal direction, the liquid droplets attached to the liquid blocking plate 410 are not easy to accumulate and are more likely to fall under the action of gravity.

[0051] In another embodiment of the present application, the liquid blocking assembly 400 is provided with two groups, and the two groups of liquid blocking assemblies 400 are arranged in a first horizontal direction XX and located on both sides of the heat exchanging tube group 300, and the first horizontal direction XX is perpendicular to the length direction of the shell 100.

[0052] When the liquid blocking plate 410 is arranged in a horizontal direction, the first horizontal direction XX can be horizontal, and Figure 1 As shown in the figure, the first horizontal direction XX is the left-right direction.

[0053] By arranging two groups of liquid blocking assemblies 400 and locating them on both sides of the heat exchanging tube group 300, the unevaporated liquid droplets mixed in the gas evaporated from the evaporating tube group 200 can be more effectively blocked. When the gas rises, no matter which side it flows to, it will encounter the corresponding liquid blocking assembly 400, thereby increasing the opportunity of being blocked and collected, significantly improving the blocking efficiency of the liquid, reducing the possibility of unevaporated liquid droplets entering the heat exchanging tube, reducing the probability of abnormal operation of the compressor, and thus improving the working efficiency of the compressor.

[0054] The two groups of liquid blocking assemblies 400 are arranged along the first horizontal direction XX and can guide the gas to be more evenly distributed in the evaporation cavity. When the gas encounters the liquid blocking assembly 400, the flow path of the gas is changed, so that the gas is prevented from being excessively concentrated in a certain area or forming a dead zone. Such uniform gas flow helps to promote the gas to pass through the liquid blocking plate 410 and finally be discharged through the vent hole 420a, thereby improving the heat exchange efficiency of the entire water chiller.

[0055] It should be understood that, in the falling film area, the two ends of the falling film area along the first horizontal direction XX have the gas blocking plate 301, and the upper end of the gas blocking plate 301 is connected with the distributor. In this way, the gas evaporated in the falling film area is driven by the refrigerant to finally enter the heat exchange cavity 100a through the lower end of the gas blocking plate 301, and part of the gas rises along the inner wall of the shell 100, contacts the liquid blocking plate 410, and rises through the flow-through gap 400a. Part of the gas directly rises through the flow-through gap 400a.

[0056] That is, the vent plate 420, the gas blocking plate 301 and the liquid blocking plate 410 enclose an exhaust cavity. Part of the evaporated gas in the heat exchange cavity 100a enters the exhaust cavity through the flow-through gap 400a under the guidance of the liquid blocking plate 410, and the other part directly enters the exhaust cavity and is discharged through the vent hole 420a in communication with the exhaust cavity.

[0057] On the basis of the above embodiment, please refer to Figure 1 The first end of the vent plate 420 can be directly connected to the inner wall of the shell 100 or connected to the liquid blocking plate 410. In the embodiment of the present application, the first end of the vent plate 420 is connected to the liquid blocking plate 410, so that the flow path of the gas in the exhaust cavity can be shortened, the heat exchange efficiency is improved, and the material of the vent plate 420 can be saved. The second end of the vent plate 420 is connected to the gas blocking plate 301, and the connection mode can be welding, screw connection or bolt connection, and the specific connection mode is not limited.

[0058] Please refer to Figure 1 Along the first horizontal direction XX, the distance between the first end of the vent plate 420 and the second end of the liquid blocking plate 410 is W1. The first end of the vent plate 420 and the second end of the liquid blocking plate 410 are spaced apart, so that the evaporated gas is difficult to quickly contact the vent plate 420 adjacent to the liquid blocking plate 410 after entering the exhaust cavity through the flow-through gap 400a, thereby reducing the direct blowing of the vapor and reducing the probability of the evaporated gas directly blowing the liquid in the evaporated gas through the vent hole 420a.

[0059] On the other hand, the distance between the first end of the vent plate 420 and the heat exchange tube group 300 is W2, where 0 < W1 < (3W2) / 4, that is, W1 can be (1W2) / 3, (1W2) / 2, (3W2) / 5, etc. By having W2 within the above range, it is ensured that there is a flow gap 400a of sufficient size to meet the steam in the falling film zone and the steam in the full liquid zone, while not affecting the turbulence of some steam passing through the baffle plate 410.

[0060] In another implementation, please refer to [link / reference]. Figure 1 Along the first horizontal direction XX, the spacing of the flow gap 400a is W3, where 20mm≤W3≤500mm, that is, W3 can be any two of 20mm, 50mm, 50mm, 50mm, 50mm, 50mm or more. Specifically, it can be designed according to the size of the shell 100 or set according to the heat exchange power. In this way, it can be ensured that the flow gap 400a has a sufficient size to meet the steam in the falling film zone and the steam in the full liquid zone, while not affecting the turbulence of some steam when passing through the baffle plate 410.

[0061] Please see Figure 1 In one embodiment of this application, the vent plate 420 includes a vent plate body 421 and a baffle 422.

[0062] Optionally, the vent plate body 421 is located above the baffle plate 410, and the vent plate body 421 is provided with a vent hole 420a, that is, the vapor entering the exhaust chamber is discharged through the vent hole 420a on the vent plate 420.

[0063] One end of the baffle 422 is connected to the heat exchange tube assembly 300, and the other end is connected to the vent plate body 421. Thus, the baffle 422 is closer to the heat exchange tube assembly 300 than the vent plate body 421. The portion of the vapor that enters the exhaust chamber through the flow gap 400a will directly impact the baffle 422, which means that the baffle 422 can also play a certain role in turbulence. The baffle 422 changes the path of the airflow. At the same time, the gas collides and contacts the baffle 422, and the droplets are attached to the baffle 422. As the gas falls along the baffle 422, it gathers into large droplets and eventually falls due to gravity. The gas flows along the baffle 422, leaves the evaporator through the vent hole 420a and the outlet pipe 101, and returns to the compressor.

[0064] During this process, since some of the gas that has passed through the baffle 410 will be blocked again by the baffle 422, the liquid carryover rate of the refrigerant can be further reduced, thus further reducing the probability of abnormal operation of the compressor and improving the working efficiency of the compressor.

[0065] Based on the previous embodiment, please refer to Figure 1The baffle 422 is set in the horizontal direction, and its impact area facing the evaporating gas is larger than that of a baffle 410 set at an angle or vertically. This means that when the evaporating gas rises and collides with the baffle 422, more of the evaporating gas will come into contact with the surface of the baffle 410 and will be more easily blocked by the baffle 422.

[0066] In addition, since the baffle plate 410 is horizontally set, the droplets attached to the baffle plate 410 are not easy to accumulate and are more likely to fall under the action of gravity.

[0067] Furthermore, in order for the baffle 422 to fully exert its turbulence-disrupting effect, the distance between the two ends of the baffle is W4 along the second horizontal direction, and the distance between the flow gaps is W3, where W4 ≤ W3. The second horizontal direction is perpendicular to the length direction of the shell. In this embodiment, the second horizontal direction is the same as the first horizontal direction, that is, W4 is not greater than W3. In this way, at least part of the evaporated gas through the flow gap 400a can directly impact the baffle 422 without being blocked by the liquid baffle 410. This fully utilizes the turbulence-disrupting effect of the baffle 422 and makes the overall structural layout more compact. Optionally, if W4 equals W3, then the evaporated gas through the flow gap 400a can completely impact the baffle 422.

[0068] In another embodiment of this application, please refer to [the document for further details]. Figure 1 The angle between the vent plate body 421 and the horizontal direction is α, where α is in the range of 0° < α < 180°. α can be any combination of 0°, 45°, 90°, 135°, 180°, or more. When α is within the above range, by adjusting the angle α between the vent plate body 421 and the horizontal direction, the flow direction of the gas can be precisely controlled, which helps to ensure that the gas can flow along a predetermined path, thereby improving heat exchange efficiency. Especially in complex gas flow environments, an appropriate angle α can guide the gas to be more evenly distributed throughout the heat exchange area, reducing the formation of dead zones and eddies.

[0069] On the other hand, by controlling and adjusting the angle α between the main body of the vent plate 421 and the horizontal direction, the speed of the airflow passing through the vent hole 420a can be changed, avoiding excessive flow speed that would carry the liquid out. In addition, by selecting a suitable angle, space can be utilized more effectively, ensuring a reasonable distance between the main body of the vent plate 421 and other components, making the entire falling film evaporator structure compact.

[0070] In one embodiment of this application, please refer to Figure 2The total area of ​​the orifices of the multiple vent holes 420a on the main body of the vent plate 421 is a, and the surface area of ​​the side of the main body of the vent plate 421 with the vent holes 420a is b. Among them, (1b) / 20≤a≤(3b) / 4, that is, a can be within the range of (1b) / 20, (1b) / 10, (1b) / 5, (1b) / 2, (3b) / 4 or any two of the above. In this way, by controlling the ratio between a and b appropriately, the flow rate of the evaporated gas through the vent holes 420a can be controlled. If the airflow speed is controlled to not exceed 10m / s, the airflow will be difficult to carry the liquid out through the vent holes 420a, thereby further reducing the liquid content in the evaporated gas.

[0071] In another embodiment of this application, please refer to Figure 2 The projections of the vent pipe 101 on the first plane and the vent hole 420a on the first plane are arranged at intervals along the length of the housing 100. The first plane is parallel to the side of the vent plate body 421 facing the vent pipe 101.

[0072] Because the projections of the outlet pipe 101 and the vent hole 420a are arranged at intervals, the gas will not directly impact the outlet pipe 101 after flowing out of the vent hole 420a. Instead, it will impact the inner wall of the housing 100. In this way, the inner wall of the housing 100 can also play a certain role in turbulence. The liquid in the evaporated gas discharged through the vent hole 420a adheres to the inner wall of the housing 100, which can reduce the liquid content of the evaporated gas discharged through the vent hole 420a. This can reduce the probability of abnormal operation of the compressor and extend the service life of the compressor.

[0073] It should be understood that the opening of the vent 420a can be circular, elliptical, square, rhomboid, or any polygonal shape, and the hole spacing can be uniform or non-uniform, or it can be a single row of holes or multiple rows of holes, without any restrictions.

[0074] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship described in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0075] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A falling film evaporator, characterized in that The application relates to a falling film evaporator. The falling film evaporator comprises a shell, an evaporation pipe group, a heat exchange pipe group and a liquid blocking assembly. The shell is formed with a heat exchange cavity and a gas outlet pipe. The evaporation pipe group is arranged in the heat exchange cavity. The heat exchange pipe group is arranged above the evaporation pipe group in the heat exchange cavity. The liquid blocking assembly is arranged above the evaporation pipe group and on the side of the heat exchange pipe group in the heat exchange cavity.

2. The falling film evaporator according to claim 1, characterized in that The liquid blocking assembly comprises a liquid blocking plate and a ventilation plate.

3. The falling film evaporator of claim 1, wherein The first end of the liquid blocking plate is connected to the inner wall of the shell.

4. The falling film evaporator of claim 3, wherein The second end of the liquid blocking plate is spaced apart from the heat exchange pipe group.

5. The falling film evaporator of claim 3, wherein The ventilation plate is arranged above the flow gap to shield the flow gap.

6. The falling film evaporator of claim 1, wherein The ventilation plate is provided with ventilation holes. The liquid blocking plate is arranged in the horizontal direction. The liquid blocking assembly is provided with two groups of liquid blocking assemblies.

7. The falling-film evaporator according to claim 6, characterized in that The two groups of liquid blocking assemblies are arranged in the first horizontal direction and are located on the two sides of the heat exchange pipe group.

8. The falling film evaporator of claim 6, wherein, The first end of the ventilation plate is connected to the liquid blocking plate.

9. The falling film evaporator of claim 6, wherein, The distance between the first end of the ventilation plate and the second end of the liquid blocking plate is W1.

10. The falling film evaporator of claim 6, wherein, The distance between the first end of the ventilation plate and the heat exchange pipe group is W2.

11. The falling film evaporator of claim 6, wherein, The distance between the two ends of the baffle in the second horizontal direction is W4.

12. A water chiller, comprising: The distance between the two ends of the baffle in the second horizontal direction is W4. The angle between the ventilation plate body and the horizontal direction is alpha. The total area of the hole openings of the ventilation holes on the ventilation plate body is a. The surface area of one side of the hole openings of the ventilation holes on the ventilation plate body is b. The projection of the gas outlet pipe on the first plane is spaced apart from the projection of the ventilation hole on the first plane in the length direction of the shell. The falling film evaporator comprises a compressor, a condenser and the falling film evaporator. The compressor, the condenser and the falling film evaporator are sequentially connected to form a heat exchange loop.

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