Falling film evaporator and chiller with cyclone separation device

Abstract

This application relates to the technical field of air conditioners, and discloses a falling film evaporator with a cyclone separation device, including a main body air outlet; a cyclone separation device, the gas phase inlet is connected to the gas phase refrigerant, and the gas phase outlet is connected to the main body air outlet. In the falling film evaporator of the embodiment of the present disclosure, a cyclone separation device is connected to the main body air outlet, so that the gas phase refrigerant processed by the falling film evaporator is subjected to rotational centrifugal separation before being discharged, and the refrigerant droplets therein are separated under the action of centrifugal force, and the liquid removal efficiency can reach more than 90%, solving the technical problem that the gas phase refrigerant discharged by the existing falling film evaporator carries refrigerant droplets, that is, solving the problem of liquid carry-over during compressor suction, and improving the operation reliability and performance of the falling film water chiller. A water chiller is also disclosed.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioners, for example, to a falling film evaporator and a water chiller with a cyclone separation device. Background Art

[0002] At present, falling film evaporators have broad application prospects in central air-conditioning water chillers. Theoretically, falling film evaporators have the advantages of high heat transfer performance and less refrigerant charge. However, in practical applications, unevaporated refrigerant droplets are easily carried into the suction pipe by the evaporation gas flow and then enter the compressor. This not only reduces the performance of the unit, but also easily causes liquid slugging of the compressor due to liquid entrainment in the suction, resulting in damage to the unit. At the same time, after the refrigerant liquid enters the compressor, the oil consumption of the compressor increases, and the compressor is easily damaged due to lack of oil. Liquid entrainment in the suction seriously affects the operation reliability and performance of the unit. In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art: the gaseous refrigerant discharged from the existing falling film evaporator carries refrigerant droplets. Summary of the Invention

[0003] To provide a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. This summary is not a comprehensive review, nor is it intended to identify key / important elements or delineate the scope of protection of these embodiments. Instead, it serves as a preface to the following detailed description.

[0004] The embodiments of the present disclosure provide a falling film evaporator and a water chiller with a cyclone separation device to solve the technical problem that the gaseous refrigerant discharged from the existing falling film evaporator carries refrigerant droplets.

[0005] In some embodiments, a falling film evaporator with a cyclone separation device includes:

[0006] An outlet of the main body;

[0007] A cyclone separation device, with a gas phase inlet connected to the gaseous refrigerant and a gas phase outlet connected to the outlet of the main body.

[0008] In some embodiments, a water chiller includes the aforementioned falling film evaporator.

[0009] The falling film evaporator and the water chiller with a cyclone separation device provided by the embodiments of the present disclosure can achieve the following technical effects:

[0010] In the falling-film evaporator according to the embodiments of the present disclosure, a cyclone separation device is connected to the gas outlet of its main body, so that the gaseous refrigerant processed by the falling-film evaporator is subjected to rotary centrifugal separation before being discharged, and the refrigerant droplets therein are separated under the action of centrifugal force, solving the technical problem that the gaseous refrigerant discharged by the existing falling-film evaporator carries refrigerant droplets, that is, solving the problem of liquid carry-over in the compressor suction, and improving the operation reliability and performance of the falling-film water chiller.

[0011] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and among them:

[0013] Figure 1 is a schematic structural diagram of a falling-film evaporator provided by an embodiment of the present disclosure;

[0014] Figure 2 is Figure 1 the sectional structural diagram taken along the A-A direction in

[0015] Figure 3 is a schematic structural diagram of a cyclone separation device provided by an embodiment of the present disclosure;

[0016] Figure 4 is Figure 3 the structural diagram taken along the B-B direction in

[0017] Figure 5 is a cyclone separation device provided by an embodiment of the present disclosure in Figure 4 the structural diagram shown in the C-C direction in

[0018] Figure 6 is a schematic structural diagram of a cyclone separation device provided by an embodiment of the present disclosure;

[0019] Figure 7 is Figure 6 the structural diagram taken along the D-D direction in

[0020] Figure 8 is Figure 7 the structural diagram taken along the E-E direction in

[0021] Figure 9 is a schematic structural diagram of a cyclone separation device provided by an embodiment of the present disclosure;

[0022] Figure 10 isFigure 9 Schematic structural diagram in the F-F direction;

[0023] Figure 11 is a schematic structural diagram of a cyclone separation device provided by an embodiment of the present disclosure; wherein, the outer cylinder is omitted;

[0024] Figure 12 is a cyclone separation device provided by an embodiment of the present disclosure in the Figure 9 Schematic structural diagram in the F-F direction;

[0025] Reference numerals:

[0026] 100, housing; 101, main body air outlet; 102, liquid inlet pipe; 103, air outlet pipe; 104, distributor; 105, support plate; 106, heat exchange tube; 107, tube sheet; 108, front water chamber; 109, rear water chamber; 110, water inlet pipe; 111, water outlet pipe; 112, main body liquid inlet; 200, cyclone separation device; 201, gas phase outlet; 202, liquid phase outlet; 203, gas phase inlet; 204, annular channel; 205, annular air inlet channel; 2051, guiding channel; 210, cylinder; 220, air inlet pipe; 221, first air inlet pipe; 222, second air inlet pipe; 230, guiding structure; 240, air outlet cylinder; 250, outer cylinder; 260, inner cylinder; 261. first port; 262, second port; 270, guiding rib; 2701, air inlet edge; 2702, air outlet edge; 271, first guiding rib; 272, second guiding rib; 273, third guiding rib; 274, fourth guiding rib; 275, fifth guiding rib; 276, sixth guiding rib; 277, seventh guiding rib; 278, eighth guiding rib. Detailed implementation manners

[0027] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for reference and illustration only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, multiple details are provided to fully understand the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner.

[0028] In this article, it should be understood that relational terms such as first and second are only used to distinguish one entity or structure from another entity or structure, and do not require or imply any actual relationship or order between these entities or structures.

[0029] In this text, it should be understood that the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as a limitation to the present disclosure.

[0030] In this text, unless otherwise specified and defined, it should be noted that the terms "installed", "connected", "linked" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] In this text, it should be understood that the term "a plurality of" means two or more.

[0032] The embodiment of the present disclosure provides a falling film evaporator with a cyclone separation device. As shown in combination Figures 1 to 12 The falling film evaporator includes a main body gas outlet 101 and a cyclone separation device 200; the gas phase inlet 203 of the cyclone separation device 200 accesses the gas phase refrigerant, and the gas phase outlet 201 is connected to the main body gas outlet 101.

[0033] In the falling film evaporator of the embodiment of the present disclosure, a cyclone separation device 200 is connected to its main body gas outlet 101, so that the gas phase refrigerant processed by the falling film evaporator is subjected to rotational centrifugal separation before being discharged. The refrigerant droplets therein are separated under the action of centrifugal force, and the liquid removal efficiency can reach more than 90%. This solves the technical problem that the gas phase refrigerant discharged from the existing falling film evaporator carries refrigerant droplets, and further solves the problem of liquid carry-over in the compressor suction, improving the operating reliability and performance of the falling film water chiller. At the same time, by arranging the cyclone separation device 200 inside the falling film evaporator, the flow resistance of the gas phase refrigerant before entering the cyclone separation device 200 can be reduced, improving the energy efficiency of the unit.

[0034] In addition, in order to reduce the droplets in the gas phase refrigerant, the existing falling film evaporator generally designs the height of the space between the distributor and the top wall of the housing (where the main body gas outlet is provided) to be relatively high. However, the falling film evaporator of the embodiment of the present disclosure just makes full use of this space, and moreover, after adding the cyclone separation device 200, the height of this space can be reduced to a certain extent, thereby reducing the diameter of the falling film evaporator and lowering the cost.

[0035] In the embodiment of the present disclosure, as shown in Figure 1 and Figure 2As shown in the figure, the falling film evaporator further includes a housing 100, a liquid inlet pipe 102, an air outlet pipe 103, a distributor 104, a support plate 105, heat exchange tubes 106, tube sheets 107, a front water chamber 108, a rear water chamber 109, a water inlet pipe 110 and a water outlet pipe 111. Among them, the housing 100 is a cylindrical body with openings at both ends. Tube sheets 107 are fixedly arranged at both ends. The two ends of the heat exchange tubes 106 are fixedly connected to the tube sheets 107 at both ends of the housing 100, and end shells are hermetically arranged outside the tube sheets 107 at both ends to form the front water chamber 108 and the rear water chamber 109 respectively. A water inlet pipe 110 and a water outlet pipe 111 are arranged on the front water chamber 108. The distributor 104 is arranged above the heat exchange tubes 106. A body liquid inlet 112 and a body air outlet 101 are arranged on the top wall of the housing 100. The liquid inlet pipe 102 is arranged on the body liquid inlet 112, and the air outlet pipe 103 is arranged on the body air outlet 101. To ensure the stability of the heat exchange tubes 106, a support plate 105 can be arranged between the tube sheets 107 at both ends. The support plate 105 is fixedly arranged in the housing 100 in a manner parallel to the tube sheets 107, and a plurality of through holes are opened thereon. The heat exchange tubes 106 are arranged through the through holes. Then, the cyclone separation device 200 is arranged in the space inside the housing 100 above the distributor 104.

[0036] When the falling film evaporator of the embodiment of the present disclosure is applied to a water chiller, the throttled gas-liquid two-phase refrigerant passes through the housing 100 from the liquid inlet pipe 102 and enters the distributor 104, and then is sprayed on the outer surface of the heat exchange tubes 106 below the distributor 104 to exchange heat with the refrigerant water inside the heat exchange tubes 106. The liquid refrigerant evaporates to form vapor (i.e., gaseous refrigerant), and the airflow (gaseous refrigerant) formed by the vapor enters the cyclone separation device 200. After the gaseous refrigerant is subjected to rotational centrifugal separation treatment, the refrigerant droplets therein are centrifugally separated and flow downward, and the gaseous refrigerant is sucked away from the body air outlet 101 and enters the compressor.

[0037] In the embodiment of the present disclosure, the cyclone separation device 200 is a device that centrifugally separates the refrigerant droplets entrained in the gaseous refrigerant by using rotational centrifugal force. The specific structural form thereof is not limited to the structural form given in the embodiment of the present disclosure, as long as it can generate centrifugal force and centrifugally separate the refrigerant droplets.

[0038] In some embodiments, as Figures 3 to 8 shown, the first cyclone separation device 200 includes a cylinder 210 and an air inlet pipe 220; a gaseous phase outlet 201 is arranged on the top wall of the cylinder 210, a liquid phase outlet 202 is arranged at the lower end, and a gaseous phase inlet 203 is arranged on the side wall; one end of the air inlet pipe 220 is connected to the gaseous phase inlet 203 of the cylinder 210, and the other end is connected to the gaseous refrigerant; and the air inlet pipe 220 is tangent to the side wall of the cylinder 210.

[0039] In this embodiment, the gas-phase refrigerant carrying droplets flows through the intake pipe 220 (such as Figure 3 the first intake pipe 221 and the second intake pipe 222 shown) and enters the cyclone separator 200. The airflow will change from linear motion to circular motion. The rotating airflow spirally descends along the wall of the cylindrical body (for example, a circular cylindrical body) 210 towards the liquid-phase outlet 202 (such as Figure 3 the constricted liquid-phase outlet 202 shown), forming an outer rotating airflow. The droplets carried by the airflow are thrown towards the inner wall of the cylindrical body 210 under the action of centrifugal force. Once the droplets come into contact with the wall, they lose their inertial force and fall along the wall under the action of gravity and the downward axial velocity of the rotating airflow, enter the liquid-phase outlet 202 and are discharged, forming the effect of gas-liquid separation. The rotating and descending outer rotating airflow turns and rotates upward along the axis when it reaches the lower end of the cylindrical body 210 (when approaching the liquid-phase outlet 202), forming an inner rotating airflow. In addition, the outer rotating airflow continuously flows into the central part of the cyclone separator 200 during the descending process, forming a centripetal radial airflow, and this part of the airflow also merges into the inner rotating airflow. The rotation directions of the inner and outer rotating airflows are the same. Finally, the airflow is discharged from the cyclone separator 200 through the gas-phase outlet 201 of the cylindrical body 210 and enters the outlet pipe 103 connected to the gas-phase outlet 201, thereby discharging the falling-film evaporator.

[0040] Optionally, a gas-phase inlet 203 is provided at the upper part of the side wall of the cylindrical body 210. To provide a longer circular motion path for the gas-phase refrigerant and improve the separation effect.

[0041] In some embodiments, the gas-phase inlet 203 is one or more. It can be determined according to the actual situation. If a plurality of gas-phase inlets 203 are provided on the side wall of the cylindrical body 210, there will be a plurality of suction inlets on the side wall of the cylindrical body 210, and the gas-phase refrigerant can enter the cylindrical body 210 through the shortest flow path, thereby reducing the flow resistance.

[0042] Optionally, when there are a plurality of gas-phase inlets 203, the plurality of gas-phase inlets 203 are evenly arranged on the side wall of the cylindrical body 10. As Figure 3 and Figure 4 shown, there are two gas-phase inlets 203, which are symmetrically arranged on the side wall of the cylindrical body 10. Then, correspondingly, the intake pipe 220 includes a first intake pipe 221 and a second intake pipe 222, which are respectively connected to the corresponding gas-phase inlets 203.

[0043] In some embodiments, in combination with Figure 3 and Figure 4As shown, the liquid phase outlet 202 of the cylinder body 210 is in a necked shape. That is, there is a necked transition part between the main body of the cylinder body 210 and the liquid phase outlet 202 at the lower end. Optionally, the necked transition part is conical, the large-diameter open end of the cone communicates with the main body of the cylinder body 210, and the small-diameter open end is the liquid phase outlet 202. Optionally, the liquid phase outlet 202 is a conical liquid phase outlet. Optionally, the cone is a frustum-shaped cone.

[0044] In some embodiments, as Figure 5 shown, the cyclone separation device 200 further includes a guiding structure 230 disposed on the inner wall of the cylinder body 210 and configured to guide the gaseous refrigerant entering from the gaseous phase inlet 203 to flow along the inner wall of the cylinder body 210. The guiding structure 230 has a guiding effect on the entering gaseous refrigerant, can enhance the rotation rate of the gaseous refrigerant, and improve the centrifugal separation efficiency.

[0045] Optionally, the guiding structure 230 is disposed on the inner wall of the cylinder body 210 and configured to guide the gaseous refrigerant entering from the gaseous phase inlet 203 to flow spirally downward along the inner wall of the cylinder body 210. Optionally, the guiding structure 230 guides the gaseous refrigerant entering from the gaseous phase inlet 203 to flow spirally toward the liquid phase outlet 202 of the cylinder body 210 along the inner wall of the cylinder body 210.

[0046] Optionally, the guiding structure 230 is formed on the inner wall of the cylinder body 210. Optionally, as Figure 5 shown, the guiding structure 230 is a spiral guiding groove opened on the inner wall of the cylinder body 210. Optionally, the groove depth of the spiral guiding groove is not greater than the wall thickness of the cylinder body 210. Optionally, the groove depth of the spiral guiding groove is one-half of the wall thickness of the cylinder body 210. Optionally, the groove width of the spiral guiding groove gradually increases.

[0047] Optionally, the guiding structure 230 is a guiding rib fixedly connected to the inner wall of the cylinder body 210. Optionally, the guiding rib is spirally connected to the inner wall of the cylinder body 210. That is, the guiding structure 230 is a spiral guiding rib.

[0048] Optionally, the number of the guiding ribs is one or two.

[0049] Optionally, when there is one guiding rib, the guiding rib is spirally arranged along the inner wall of the cylinder body 210 starting from the lower edge of the gaseous phase inlet 203.

[0050] Optionally, when there are two guiding ribs, one guiding rib is spirally arranged along the inner wall of the cylinder body 210 starting from the lower edge of the gaseous phase inlet 203; the other guiding rib is spirally arranged along the inner wall of the cylinder body 210 starting from the upper edge of the gaseous phase inlet 203. In this embodiment, the formed guiding structure is similar to the aforementioned guiding groove structure.

[0051] In some embodiments, as Figures 6 to 8 shown, the cyclone separation device 200 further includes an air outlet cylinder 240 disposed at the gas phase outlet 201 of the cylinder body 210 and forming an annular channel with the cylinder body 210. This can strengthen the circumferential movement of the gaseous refrigerant, improve the separation efficiency, and at the same time, the inner swirling airflow is discharged from the falling film evaporator through the air outlet cylinder 240, reducing the interference of the inner swirling airflow on the outer swirling airflow.

[0052] In some embodiments, as Figure 6 and Figure 8 shown, the first end 241 of the air outlet cylinder 240 extends into the cylinder body 210, and the horizontal plane where the end face of the first end 241 is located is not higher than the horizontal plane where the gas phase inlet 203 is located. This forms an annular channel 204 at the gas phase inlet 203, strengthening the circumferential movement of the gaseous refrigerant, more preferably reducing the interference of the inner swirling airflow on the outer swirling airflow at the gas phase inlet 203, and improving the separation efficiency. Moreover, it is also beneficial to the uniform intake of the gaseous refrigerant and reduces the flow resistance of the airflow. The second end 242 of the air outlet cylinder 240 is connected to the air outlet pipe 103. Among them, Figure 6 the structure shown by the dotted line in the figure is the structural line of the partial air outlet cylinder 240 and the gas phase inlet 203 located inside the cylinder body 210.

[0053] Optionally, the ratio of the inner diameter of the cylinder body 210 to the outer diameter of the air outlet cylinder 240 is 1.5 - 2. Under the condition of meeting the airflow resistance requirements, the smaller the inner diameter of the cylinder body 210, the better the gas-liquid separation effect. The annular width of the formed annular channel 204 adapts to the circumferential movement of the gaseous refrigerant, reducing the collision of the airflow with the outer wall of the air outlet cylinder 240 and reducing the flow resistance of the airflow.

[0054] In some embodiments, as Figures 9 to 11 shown, the second cyclone separation device 200 includes an outer cylinder body 250, an inner cylinder body 260, and a guiding rib plate 270. The outer cylinder body 250 is provided with a first open end and a second open end; among them, the second open end is set as the liquid phase outlet 202. The inner cylinder body 260 is disposed at the first open end of the outer cylinder body 250 and forms an annular air inlet channel 205 with the outer cylinder body 250, and this annular air inlet channel 205 serves as the gas phase inlet 203; the first port 261 of the inner cylinder body 260 located on the side of the first open end of the outer cylinder body 250 serves as the gas phase outlet 201. The guiding rib plate 270 is disposed in the annular air inlet channel 205 and is set to divide the annular air inlet channel 205 into a plurality of guiding channels 2051; and the plurality of guiding channels 2051 are in the same-direction spiral shape.

[0055] In the second cyclone separation device according to the embodiments of the present disclosure, the gas phase inlet 203 is located at the top and the air enters axially along the outer cylinder 250. After passing through a plurality of guiding channels 2051 in the same-direction spiral shape, the axial air inlet direction is changed from the axial direction along the outer cylinder 250 to the tangential air outlet along the air outlet edge 2702 of the guiding rib 270; thereby forming a rotating airflow rotating along the inner wall of the outer cylinder 250, that is, the airflow entering axially is changed into a rotating airflow with a circumferential circular motion. This rotating airflow spirally flows downward along the wall of the outer cylinder 250 towards the liquid phase outlet 202 (such as Figure 9 the constricted liquid phase outlet 202 shown) to form an outer rotating airflow. The liquid droplets carried by the airflow are thrown towards the inner wall of the outer cylinder 250 under the action of centrifugal force. Once the liquid droplets contact the wall, they lose the inertial force and fall along the wall surface under the action of gravity and the downward axial velocity of the rotating airflow, enter the liquid phase outlet 202 and are discharged, forming the effect of gas-liquid separation. The rotating and descending outer rotating airflow turns to rotate upward along the axis when reaching the lower end of the outer cylinder 250 (when approaching the liquid phase outlet 202) to form an inner rotating airflow. In addition, the outer rotating airflow continuously flows into the central part of the cyclone separation device 200 during the descending process to form a centripetal radial airflow, and this part of the airflow also merges into the inner rotating airflow. The rotating directions of the inner and outer rotating airflows are the same. Finally, the airflow is discharged from the cyclone separation device 200 through the gas phase outlet 201 of the inner cylinder 260 and enters the air outlet pipe 103 connected to the gas phase outlet 201, thereby being discharged from the falling film evaporator.

[0056] In the embodiments of the present disclosure, the plurality of guiding channels 2051 divided by the guiding rib 270 are in a spiral shape. Therefore, the tangential direction of the air outlet end (i.e., the air outlet edge 2702) of the guiding channel 2051 must form a certain angle with the axial direction of the outer cylinder 250 (the axial direction towards the liquid phase outlet 202 side), thereby guiding and deflecting the incoming air to form a rotating airflow. That is, the tangential direction of the air outlet edge 2702 of the guiding rib 270 forms a certain angle with the axial direction of the outer cylinder 250. This angle is not greater than 90°. Optionally, this angle is greater than or equal to 60° and less than or equal to 90°. Optionally, this angle is 60°, 70°, 80°, 90°, or any other angle between 60° and 90°.

[0057] Optionally, this angle is 90°. That is, the tangent of the air outlet edge 2702 of the guiding rib 270 is perpendicular to the axial direction of the outer cylinder 250. When the airflow guided by the plurality of guiding channels 2501 enters the outer cylinder 250, the airflow direction is along the circumferential direction of the inner wall of the outer cylinder 250, making the rotation of the rotating airflow strong and improving the liquid removal efficiency.

[0058] In the embodiments of the present disclosure, the length of the spiral guiding channel 2501 is not limited and can be determined according to the actual situation. The axial height of the spiral guiding channel 2501 (i.e., as Figure 10When the length h) of the guiding rib piece 270 extending into the outer cylinder 250 is fixed, the length of the spiral guiding channel 2501 is determined by its span l. Here, as Figure 11 shown, the span l refers to the length of the circumference spanned from the air inlet end of the spiral guiding channel 2051 (i.e., the air inlet edge 2701 of the guiding rib piece 270) to the air outlet end (i.e., the air outlet edge 2702 of the guiding rib piece 270). Moreover, the span of the spiral guiding channel 2501 also determines the structural form of the guiding rib piece 270.

[0059] In some embodiments, the span of the spiral guiding channel 2501 is less than or equal to one-fourth of the circumference. In this embodiment, the guiding rib piece 270 is fan-shaped. Alternatively, in some other embodiments, the span of the spiral guiding channel 2501 is greater than one-fourth of the circumference. In this embodiment, the guiding rib piece 270 is spiral-shaped.

[0060] Optionally, the span of the spiral guiding channel 2501 is greater than one-twelfth of the circumference and less than or equal to one-fourth of the circumference.

[0061] Optionally, the span of the spiral guiding channel 2501 is greater than one-eighth of the circumference and less than or equal to one-fourth of the circumference.

[0062] Optionally, the span of the spiral guiding channel 2501 is greater than one-sixth of the circumference and less than or equal to one-fourth of the circumference.

[0063] Optionally, the span of the spiral guiding channel 2501 is greater than one-fourth of the circumference and less than or equal to one-half of the circumference.

[0064] Optionally, the span of the spiral guiding channel 2501 is greater than one-fourth of the circumference and less than or equal to one-third of the circumference.

[0065] In the embodiments of the present disclosure, the larger the span of the spiral guiding channel 2501, the smoother the air duct of the spiral guiding channel 2501, the more the tangential direction of the air outlet edge approaches perpendicular to the axial direction, the stronger the rotation of the airflow entering the outer cylinder 250, the greater the centrifugal force, and the higher the liquid removal efficiency.

[0066] In the embodiments of the present disclosure, the wall surface of the spiral guiding channel 2501 has a smooth transition to ensure the smooth flow of the incoming air and reduce the flow resistance. The formation of the wall surface of the spiral guiding channel 2501 is determined by the shape of the guiding rib piece 270. It is only necessary to determine the structural form of the guiding rib piece 270 according to the required shape of the guiding channel 2501.

[0067] In some embodiments, the inner edge of the guiding rib piece 270 is connected to the outer wall of the inner cylinder 260, and the outer edge is connected to the inner wall of the outer cylinder 250.

[0068] In the embodiments of the present disclosure, the number of the guiding rib pieces 270 is not limited and can be determined according to the actual situation. Optionally, the number of the guiding rib pieces 270 is one or more, for example, 1, 2, 3, 4, 5, 6 or more, without limitation. As Figure 9 shown, the number of the guiding rib pieces 270 is 8, which are evenly distributed in the annular channel 204; among them, the 8 guiding rib pieces 270 are sequentially defined as the first guiding rib piece 271, the second guiding rib piece 272, the third guiding rib piece 273, the fourth guiding rib piece 274, the fifth guiding rib piece 275, the sixth guiding rib piece 276, the seventh guiding rib piece 277 and the eighth guiding rib piece 278. The 8 guiding rib pieces 270 divide the annular air inlet channel 205 into 8 guiding channels 2051 (as Figure 11 shown), and the span of each guiding rib piece 270 is one quarter of the circumference.

[0069] In some embodiments, as Figure 12 shown, the guiding rib pieces 270 are inclined towards the inner wall of the outer cylinder 250. This is beneficial to the air flow sticking to the inner wall of the outer cylinder 250, increasing the centrifugal force and improving the liquid removal efficiency.

[0070] In some embodiments, as Figure 10 and Figure 11 shown, the length that the second port 262 of the inner cylinder 260 extends into the outer cylinder 250 is greater than or equal to the length h that the guiding rib pieces 270 extend into the outer cylinder 250. The rotating air flow formed after being guided by the multiple guiding channels can be further strengthened in its circumferential movement under the action of the lower part of the annular channel.

[0071] In some embodiments, in combination with Figure 10 shown, the liquid phase outlet 202 at the second open end of the outer cylinder 250 is in a necked shape. That is, there is a necked transition part between the main body of the outer cylinder 250 and the liquid phase outlet 202. Optionally, the necked transition part is conical, the large-diameter open end of the cone communicates with the main body of the outer cylinder 250, and the small-diameter open end is the liquid phase outlet 202. Optionally, the liquid phase outlet 202 is a conical liquid phase outlet. Optionally, the cone is a frustum-shaped cone.

[0072] The embodiments of the present disclosure provide a chiller, including the aforementioned falling-mode evaporator.

[0073] In the chiller according to the embodiment of the present disclosure, the refrigerant droplets carried in the gaseous refrigerant discharged from the falling-mode evaporator can be reduced by more than 90%, reducing liquid carryover during suction, and the unit performance will not be reduced due to liquid carryover during suction, ensuring the unit performance. Moreover, the compressor does not generate liquid slugging, avoiding unit damage caused by liquid slugging. By not increasing the oil carryover of the compressor, the consequence of compressor damage caused by increased oil carryover of the compressor will not occur. In short, the chiller according to the embodiment of the present disclosure operates reliably and has good performance.

[0074] This application is not limited to the structures already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is only limited by the appended claims.

Claims

1. A falling film evaporator with a cyclone separation device, characterized in that, including body air outlet cyclone separation device, with the gas-phase inlet connected to the gas-phase refrigerant and the gas-phase outlet connected to the body air outlet The cyclone separation device includes an outer cylinder body provided with a first open end and a second open end; wherein, the second open end is set as the liquid-phase outlet and the liquid-phase outlet is in a constricted shape an inner cylinder body arranged at the first open end of the outer cylinder body and forming an annular channel with the outer cylinder body; the annular channel serves as the gas-phase inlet; the first port of the inner cylinder body on the side of the first open end of the outer cylinder body serves as the gas-phase outlet guide rib fins arranged in the annular channel and configured to divide the annular channel into a plurality of guide channels; and the plurality of guide channels are in a co-directional spiral shape The tangential direction of the air outlet edge of the guide rib fins forms a certain angle with the axial direction of the outer cylinder body, and this angle is not greater than 90° 2. The falling film evaporator according to claim 1, characterized in that, The span of the spiral guide channel is less than or equal to one-fourth of the circumference or, the span of the spiral guide channel is greater than one-fourth of the circumference 3. The falling film evaporator according to claim 2, characterized in that, The span of the spiral guide channel is greater than one-twelfth of the circumference and less than or equal to one-fourth of the circumference or, the span of the spiral guide channel is greater than one-fourth of the circumference and less than or equal to one-half of the circumference 4. The falling film evaporator according to claim 1, characterized in that, The length of the second port of the inner cylinder body extending into the outer cylinder body is greater than or equal to the length of the guide rib fins extending into the outer cylinder body 5. The falling film evaporator according to claim 1, characterized in that, The tangential direction of the air outlet edge of the guide rib fins forms a certain angle with the circumferential direction of the outer cylinder body, and this angle is 60°, 70°, 80° or 90° 6. The falling film evaporator according to claim 1, characterized in that, The inner edge of the guide rib fins is connected to the outer wall of the inner cylinder body, and the outer edge is connected to the inner wall of the outer cylinder body 7. The falling film evaporator according to claim 1, characterized in that, The guide rib fins are inclined towards the inner wall of the outer cylinder body 8. A chiller, characterized in that, including the falling film evaporator according to any one of claims 1 to 7

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