CN112944738A

CN112944738A - Falling film evaporator with cyclone separation device and water chilling unit

Info

Publication number: CN112944738A
Application number: CN201911251030.9A
Authority: CN
Inventors: 路则锋
Original assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Current assignee: Qingdao Haier Smart Technology R&D Co Ltd; Haier Smart Home Co Ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2021-06-11

Abstract

The application relates to the technical field of air conditioners and discloses a falling film evaporator with a cyclone separation device, which comprises a body air outlet; the gas phase inlet of the cyclone separation device is connected with a gas phase refrigerant, and the gas phase outlet is connected with the gas outlet of the body. The falling film evaporator disclosed by the embodiment of the disclosure is characterized in that the cyclone separation device is connected to the air outlet of the body of the falling film evaporator, so that a gas-phase refrigerant treated by the falling film evaporator is subjected to rotary centrifugal separation treatment before being discharged, refrigerant liquid drops are separated out under the action of centrifugal force, the liquid removal efficiency can reach more than 90%, the technical problem that the gas-phase refrigerant discharged by the existing falling film evaporator contains refrigerant liquid drops is solved, namely, the problem that a compressor absorbs air and carries liquid is solved, and the operation reliability and performance of a falling film water chilling unit are improved. A water chilling unit is also disclosed.

Description

Falling film evaporator with cyclone separation device and water chilling unit

Technical Field

The application relates to the technical field of air conditioners, for example to a falling film evaporator with a cyclone separation device and a water chilling unit.

Background

At present, the falling film evaporator has wide application prospect in a central air-conditioning water chilling unit. Theoretically, the falling film evaporator has the advantages of high heat transfer performance, small refrigerant filling amount and the like, but in practical application, unevaporated refrigerant liquid drops are easily brought into an air suction pipe along with evaporation airflow and then enter a compressor, so that the performance of a unit is reduced, the compressor is easily subjected to liquid impact due to air suction, the unit is damaged, and meanwhile, after the refrigerant liquid enters the compressor, the oil leakage amount of the compressor is increased, and the compressor is easily damaged due to oil shortage. The air suction and liquid carrying seriously affect 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 gas phase refrigerant discharged from the existing falling film evaporator contains refrigerant liquid drops.

Disclosure of Invention

The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview nor is intended to identify key/critical elements or to delineate the scope of such embodiments but rather as a prelude to the more detailed description that is presented later.

The embodiment of the disclosure provides a falling film evaporator with a cyclone separation device and a water chilling unit, which are used for solving the technical problem that gas phase refrigerant discharged by the existing falling film evaporator contains refrigerant liquid drops.

In some embodiments, a falling film evaporator with a cyclonic separation apparatus includes,

a gas outlet of the body;

the gas phase inlet of the cyclone separation device is connected with a gas phase refrigerant, and the gas phase outlet is connected with the gas outlet of the body.

In some embodiments, a chiller comprises the falling film evaporator described above.

The falling film evaporator and the water chilling unit with the cyclone separation device provided by the embodiment of the disclosure can realize the following technical effects:

the falling film evaporator disclosed by the embodiment of the disclosure is characterized in that the cyclone separation device is connected to the air outlet of the body of the falling film evaporator, so that the gas-phase refrigerant treated by the falling film evaporator is subjected to rotary centrifugal separation treatment before being discharged, and refrigerant liquid drops are separated out under the action of centrifugal force, thereby solving the technical problem that the gas-phase refrigerant discharged by the existing falling film evaporator contains refrigerant liquid drops, namely solving the problem that a compressor sucks air and carries liquid, and improving the operation reliability and performance of the falling film water chilling unit.

The foregoing general description and the following description are exemplary and explanatory only and are not restrictive of the application.

Drawings

One or more embodiments are illustrated in the accompanying drawings, which correspond to the accompanying drawings, and which do not constitute a limitation on the embodiments, in which elements having the same reference number designation are shown as similar elements, and in which:

fig. 1 is a schematic structural diagram of a falling film evaporator provided in an embodiment of the present disclosure;

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;

FIG. 3 is a schematic view of a cyclone separating apparatus provided by an embodiment of the present disclosure;

FIG. 4 is a schematic view of the structure in the direction B-B in FIG. 3;

FIG. 5 is a schematic view of a cyclonic separating apparatus according to an embodiment of the present disclosure, shown in the direction C-C of FIG. 4;

FIG. 6 is a schematic view of a cyclone separating apparatus provided by an embodiment of the present disclosure;

FIG. 7 is a schematic view of the structure of FIG. 6 in the direction D-D;

FIG. 8 is a schematic view of the structure of FIG. 7 in the direction E-E;

FIG. 9 is a schematic view of a cyclone separating apparatus according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of the structure of FIG. 9 in the direction F-F;

FIG. 11 is a schematic view of a cyclone separating apparatus according to an embodiment of the present disclosure; wherein, the outer cylinder body is omitted;

FIG. 12 is a schematic view of a cyclone separating apparatus provided in accordance with an embodiment of the present disclosure, taken in the direction F-F of FIG. 9;

reference numerals:

100. a housing; 101. a gas outlet of the body; 102. a liquid inlet pipe; 103. an air outlet pipe; 104. a dispenser; 105. a support plate; 106. a heat exchange pipe; 107. a tube sheet; 108. a front water chamber; 109. a rear water chamber; 110. a water inlet pipe; 111. a water outlet pipe; 112. a liquid inlet of the body; 200. a cyclonic separating apparatus; 201. a gas phase outlet; 202. a liquid phase outlet; 203. a gas phase inlet; 204. an annular channel; 205. an annular air inlet channel; 2051. a guide channel; 210. a barrel; 220. an air inlet pipe; 221. a first intake pipe; 222. a second intake pipe; 230. a guide structure; 240. an air outlet cylinder; 250. an outer cylinder; 260. an inner cylinder; 261. a first port; 262. a second port; 270. a guide rib piece; 2701. an air inlet edge; 2702. an air outlet edge; 271. a first guide rib piece; 272. a second guide rib piece; 273. a third guide rib piece; 274. a fourth guide rib piece; 275. a fifth guide rib piece; 276. a sixth guide rib piece; 277. a seventh guide rib piece; 278. the eighth direction muscle piece.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

In this document, it is to be understood that relational terms such as first and second, and the like, may be used solely to distinguish one entity or structure from another entity or structure without necessarily requiring or implying any actual such relationship or order between such entities or structures.

In this document, it is to be understood that the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the present disclosure and to simplify the description, but are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present disclosure.

In this document, unless otherwise specified and limited, it is to be understood that the terms "mounted," "connected," and "connected" are used broadly and may be, for example, mechanically or electrically connected, or may be connected through two elements, directly or indirectly through an intermediate medium, and those skilled in the art will understand the specific meaning of the terms as they are used in a specific situation.

In this context, it is to be understood that the term "plurality" means two or more.

The disclosed embodiments provide a falling film evaporator with a cyclone separation device. As shown in fig. 1 to 12, the falling film evaporator includes a main body outlet 101 and a cyclone device 200; the gas phase inlet 203 of the cyclone separation device 200 is connected with gas phase refrigerant, and the gas phase outlet 201 is connected with the body air outlet 101.

The falling film evaporator of the embodiment of the disclosure is characterized in that the cyclone separation device 200 is connected to the air outlet 101 of the body, so that the gas-phase refrigerant treated by the falling film evaporator is subjected to rotary centrifugal separation treatment before being discharged, the refrigerant liquid drops are separated out under the action of centrifugal force, the liquid removal efficiency can reach more than 90%, the technical problem that the gas-phase refrigerant discharged by the existing falling film evaporator contains refrigerant liquid drops is solved, the problem that the compressor absorbs air and carries liquid is further solved, and the operation reliability and performance of the falling film water chilling unit are improved. Meanwhile, the cyclone separation device 200 is arranged in the falling film evaporator, so that the flow resistance of gas-phase refrigerant airflow before entering the cyclone separation device 200 can be reduced, and the energy efficiency of the unit is improved.

In addition, in order to reduce the liquid droplets in the gas-phase refrigerant, the height of the space between the distributor and the top wall of the shell (where the body outlet is provided) is generally designed to be high. The falling film evaporator of the embodiment of the present disclosure makes full use of the space, and the height of the space can be reduced to a certain extent after the cyclone separation device 200 is added, so that the diameter of the falling film evaporator can be reduced, and the cost can be reduced.

In the embodiment of the present disclosure, as shown in fig. 1 and fig. 2, the falling film evaporator further includes a shell 100, a liquid inlet pipe 102, a gas outlet pipe 103, a distributor 104, a supporting plate 105, a heat exchange pipe 106, a pipe plate 107, a front water chamber 108, a rear water chamber 109, a water inlet pipe 110, and a water outlet pipe 111. The shell 100 is a cylinder with two open ends, tube plates 107 are fixedly arranged at the two ends, the two ends of the heat exchange tube 106 are fixed on the tube plates 107 at the two ends of the shell 100, end shells are arranged outside the tube plates 107 at the two ends to respectively form a front water chamber 108 and a rear water chamber 109, and a water inlet pipe 110 and a water outlet pipe 111 are arranged on the front water chamber 108. The distributor 104 is disposed above the heat exchange pipe 106. A body liquid inlet 112 and a body gas outlet 101 are arranged on the top wall of the shell 100, the liquid inlet pipe 102 is arranged on the body liquid inlet 112, and the gas outlet pipe 103 is arranged on the body gas outlet 101. In order to ensure the stability of the heat exchange tube 106, a support plate 105 may be disposed between the tube plates 107 at the two ends, the support plate 105 is fixedly disposed in the casing 100 in a manner parallel to the tube plates 107, and a plurality of through holes are formed on the support plate, and the heat exchange tube 106 is disposed through the through holes. The cyclonic separating apparatus 200 is then located in the space within the housing 100 above the distributor 104.

When the falling film evaporator of the embodiment of the present disclosure is applied to a chiller, throttled gas-liquid two-phase refrigerant enters the distributor 104 from the liquid inlet pipe 102 through the shell 100, and then is sprayed on the outer surface of the heat exchange pipe 106 at the lower part of the distributor 104 to exchange heat with refrigerant water in the heat exchange pipe 106, the liquid refrigerant is evaporated to form vapor (i.e., gas-phase refrigerant), and airflow (gas-phase refrigerant) formed by the vapor enters the cyclone separation device 200. After the gas-phase refrigerant is subjected to the rotating centrifugal separation treatment, the refrigerant liquid drops in the gas-phase refrigerant flow downwards through centrifugal separation, and the gas-phase refrigerant is sucked away from the body gas outlet 101 and enters the compressor.

In the embodiment of the present disclosure, the cyclone separation device 200 is a device for centrifugally separating refrigerant droplets entrained in a gas-phase refrigerant by using a rotational centrifugal force, and the specific structural form thereof is not limited to the structural form given in the embodiment of the present disclosure as long as a structure that generates a centrifugal force and centrifugally separates refrigerant droplets is possible.

In some embodiments, as shown in fig. 3 to 8, the first cyclonic separating apparatus 200 comprises a bowl 210 and an inlet duct 220; a gas phase outlet 201 is arranged on the top wall of the cylinder 210, a liquid phase outlet 202 is arranged at the lower end of the cylinder, and a gas phase inlet 203 is arranged on the side wall of the cylinder; one end of the air inlet pipe 220 is connected with the gas phase inlet 203 of the cylinder 210, and the other end is connected with a gas phase refrigerant; and the air inlet pipe 220 is tangent to the sidewall of the cylinder 210.

In this embodiment, the gas-phase refrigerant gas flow carrying liquid droplets enters the cyclone separation device 200 through the gas inlet pipe 220 (such as the first gas inlet pipe 221 and the second gas inlet pipe 222 shown in fig. 3), and the gas flow changes from linear motion to circular motion. The swirling air flow spirally flows downwards along the wall of the cylindrical body (e.g., a cylinder) 210 toward the liquid phase outlet 202 (the liquid phase outlet 202 in a throat shape as shown in fig. 3) to form an outward swirling air flow, liquid droplets carried by the air flow are thrown to the inner wall of the cylindrical body 210 under the action of centrifugal force, once the liquid droplets contact the wall, the inertia force is lost, the liquid droplets fall along the wall surface under the action of gravity and the downward axial velocity of the swirling air flow, enter the liquid phase outlet 202 and are discharged, and the effect of gas-liquid separation is achieved. The outward swirling airflow which rotates and descends reaches the lower end of the cylinder 210 (when approaching the liquid phase outlet 202) and rotates and flows upwards along the axis to form an inward swirling airflow, and in addition, the outward swirling airflow continuously flows into the central part of the cyclone separation device 200 in the descending process to form a centripetal radial airflow, and the airflow is also merged into the inward swirling airflow. The rotation directions of the internal and external cyclone air flows are the same, and finally the air flow is discharged out of the cyclone separation device 200 through the gas phase outlet 201 of the cylinder 210, enters the gas outlet pipe 103 connected with the gas phase outlet 201 and is discharged out of the falling film evaporator.

Optionally, the upper portion of the sidewall of the drum 210 is provided with a gas phase inlet 203. Provides a longer circular motion path for the gas-phase refrigerant, and improves the separation effect.

In some embodiments, the gas phase inlet 203 is one or more. The determination is carried out according to actual conditions. The plurality of gas phase inlets 203 are provided on the sidewall of the cylinder 210, and the plurality of suction ports are provided on the sidewall of the cylinder 210, so that the gas phase refrigerant can enter the cylinder 210 with the shortest flow path, thereby reducing flow resistance.

Optionally, when there are a plurality of gas phase inlets 203, the plurality of gas phase inlets 203 are uniformly disposed on the sidewall of the cylinder 10. As shown in fig. 3 and 4, the gas phase inlets 203 are two and symmetrically disposed on the sidewall of the cylinder 10. Accordingly, the gas inlet pipe 220 includes a first gas inlet pipe 221 and a second gas inlet pipe 222, which are respectively connected to the corresponding gas phase inlets 203.

In some embodiments, as shown in conjunction with fig. 3 and 4, the liquid phase outlet 202 of the cartridge 210 is necked. That is, a throat-shaped transition portion is provided between the main body of the cylinder 210 and the liquid phase outlet 202 at the lower end. Optionally, the tapered transition portion is tapered, and a tapered large-caliber open end is communicated with the main body of the cylinder 210, and the small-caliber open end is the liquid phase outlet 202. Optionally, the liquid phase outlet 202 is a tapered liquid phase outlet. Optionally, the taper is a frustoconical taper.

In some embodiments, as shown in fig. 5, the cyclone device 200 further includes a guiding structure 230 disposed on the inner wall of the cylinder 210 and configured to guide the gas-phase refrigerant entering from the gas-phase inlet 203 to flow along the inner wall of the cylinder 210. The guiding structure 230 has a guiding function on the entering gas-phase refrigerant, and can enhance the rotation rate of the gas-phase refrigerant and improve the centrifugal separation efficiency.

Alternatively, the guiding structure 230 is disposed on the inner wall of the cylinder 210 and configured to guide the gas-phase refrigerant entering from the gas-phase inlet 203 to flow downwards along the inner wall of the cylinder 210 in a spiral shape. Alternatively, the guiding structure 230 guides the gas-phase refrigerant entering from the gas-phase inlet 203 to flow along the inner wall of the cylinder 210 in a spiral shape toward the liquid-phase outlet 202 of the cylinder 210.

Optionally, the guide structure 230 is formed on the inner wall of the cylinder 210. Alternatively, as shown in fig. 5, the guide structure 230 is a spiral guide groove opened on the inner wall of the cylinder 210. Optionally, the groove depth of the helical guide groove is not greater than the wall thickness of the barrel 210. Optionally, the helical guide grooves have a groove depth of one half of the wall thickness of the cylinder 210. Alternatively, the groove width of the spiral guide groove gradually increases.

Alternatively, the guiding structure 230 is a guiding rib fixedly connected to the inner wall of the barrel 210. Alternatively, the guide ribs are spirally connected to the inner wall of the cylinder 210. That is, the guide structure 230 is a spiral guide rib.

Alternatively, the number of the guide ribs is one or two.

Alternatively, in the case of a guide rib, the guide rib is spirally arranged along the inner wall of the cylinder 210 from the lower edge of the gas phase inlet 203.

Alternatively, when two guiding ribs are provided, one guiding rib is spirally arranged along the inner wall of the cylinder 210 from the lower edge of the gas phase inlet 203; the other guide rib is spirally arranged along the inner wall of the cylinder 210 from the upper edge of the gas phase inlet 203. In this embodiment, the guide structure is formed like the guide groove structure described above.

In some embodiments, as shown in fig. 6 to 8, the cyclone separation device 200 further comprises an air outlet tube 240 disposed at the gas phase outlet 201 of the cylinder 210 and forming an annular passage with the cylinder 210. The circular motion of the gas-phase refrigerant can be strengthened, the separation efficiency is improved, and meanwhile, the internal rotation air flow is discharged out of the falling film evaporator through the air outlet cylinder 240, so that the interference of the internal rotation air flow to the external rotation air flow is reduced.

In some embodiments, as shown in fig. 6 and 8, the first end 241 of the gas outlet cylinder 240 extends into the cylinder 210, and the end surface of the first end 241 is located at a level no higher than the level of the gas phase inlet 203. An annular channel 204 is formed at the gas phase inlet 203, so that the circular motion of the gas phase refrigerant is strengthened, the interference of the internal vortex gas flow to the external vortex gas flow at the gas phase inlet 203 is reduced more preferably, and the separation efficiency is improved. But also is beneficial to the uniform air intake of the gas-phase refrigerant and reduces the flow resistance of the airflow. And the second end 242 of the air outlet cylinder 240 is connected with the air outlet pipe 103. The structure shown by the dotted line in fig. 6 is a structural line of a part of the gas outlet cylinder 240 and the gas phase inlet 203 located inside the cylinder 210.

Optionally, the ratio of the inner diameter of the cylinder 210 to the outer diameter of the gas outlet cylinder 240 is 1.5-2. Under the condition of meeting the requirement of air flow resistance, the smaller the inner diameter of the cylinder 210 is, the better the gas-liquid separation effect is. The annular width of the annular channel 204 is formed to accommodate the circular motion of the gaseous refrigerant, reducing the collision of the gas stream with the outer wall of the gas outlet cylinder 240 and reducing the flow resistance of the gas stream.

In some embodiments, as shown in fig. 9-11, the second cyclonic separating apparatus 200 includes an outer cylinder 250, an inner cylinder 260 and guide ribs 270. The outer cylinder 250 is provided with a first open end and a second open end; wherein the second open end is provided as a liquid phase outlet 202. The inner cylinder 260 is arranged at the first open end of the outer cylinder 250, and an annular air inlet channel 205 is formed between the inner cylinder 260 and the outer cylinder 250, and the annular air inlet channel 205 is used as a gas phase inlet 203; the first port 261 of the inner cylinder 260 located at the first open end side of the outer cylinder 250 serves as the gas phase outlet 201. Guide fins 270 provided in the annular inlet channel 205, and configured to divide the annular inlet channel 205 into a plurality of guide channels 2051; and the plurality of guide channels 2051 are spiral in the same direction.

In the second cyclone separation device of the embodiment of the present disclosure, the gas phase inlet 203 is located at the top, and enters air along the axial direction of the outer cylinder 250, and after passing through the plurality of guide channels 2051 in the same-direction spiral shape, the wind direction of the axial inlet air is changed from the axial direction of the outer cylinder 250 to the tangential outlet air along the air outlet edge 2702 of the guide rib 270; thereby forming a rotating air flow rotating along the inner wall of the outer cylinder 250, i.e., the air flow entering in the axial direction is changed into a rotating air flow moving in a circumferential direction. The rotating airflow spirally flows downwards towards the liquid phase outlet 202 (the necking-shaped liquid phase outlet 202 shown in fig. 9) along the wall of the outer cylinder 250 to form an outer rotating airflow, liquid drops carried by the airflow are thrown to the inner wall of the outer cylinder 250 under the action of centrifugal force, once the liquid drops contact with the wall, the inertia force is lost, the liquid drops fall along the wall under the action of gravity and the downward axial speed of the rotating airflow, and the liquid drops enter the liquid phase outlet 202 to be discharged, so that the effect of gas-liquid separation is formed. The outward swirling airflow which rotates and descends reaches the lower end of the outer cylinder 250 (when approaching the liquid phase outlet 202) and rotates and flows upwards along the axis to form an inward swirling airflow, and in addition, the outward swirling airflow continuously flows into the central part of the cyclone separation device 200 in the descending process to form a centripetal radial airflow, and the airflow is also merged into the inward swirling airflow. The rotation directions of the inner cyclone air flow and the outer cyclone air flow are the same, and finally the air flow is discharged out of the cyclone separation device 200 through the gas phase outlet 201 of the inner cylinder 260 and enters the air outlet pipe 103 connected with the gas phase outlet 201, so that the air flow is discharged out of the falling film evaporator.

In the embodiment of the present disclosure, the plurality of guide channels 2051 divided by the guide fins 270 are spiral, and therefore, a tangential direction of an air outlet end (i.e., the air outlet edge 2702) of the guide channel 2051 forms a certain included angle with an axial direction (an axial direction toward the liquid phase outlet 202 side) of the outer cylinder 250, so as to guide and turn the inlet air to form a rotating airflow. That is, the air outlet edge 2702 of the guide rib 270 is tangential to the outer cylinder 250 at a certain angle. The included angle is not greater than 90 deg.. Optionally, the included angle is greater than or equal to 60 ° and less than or equal to 90 °. Optionally, the included angle is 60 °, 70 °, 80 °, 90 °, or any other angle between 60 ° and 90 °.

Optionally, the included angle is 90 °. That is, a tangent line of the air outlet edge 2702 of the guide rib 270 is perpendicular to the axial direction of the outer cylinder 250. When the air flow guided by the plurality of guide channels 2501 enters the outer cylinder 250, the air flow direction is along the circumferential direction of the inner wall of the outer cylinder 250, so that the rotation of the rotating air flow is strong, and the liquid removal efficiency is improved.

In the embodiment of the present disclosure, the length of the spiral guide channel 2501 is not limited, and may be determined according to actual situations. In the case where the axial height of the spiral guide channel 2501 (i.e., the length h of the guide rib 270 extending into the outer cylinder 250 as shown in fig. 10) is constant, the length of the spiral guide channel 2501 is determined by the span l thereof. As shown in fig. 11, the span l is a length of a circumference spanned from the air inlet end (i.e., the air inlet edge 2701 of the air guide fin 270) to the air outlet end (i.e., the air outlet edge 2702 of the air guide fin 270) of the spiral guide duct 2051. Furthermore, the span of the helical guide channel 2501 also determines the form of the guide rib 270.

In some embodiments, the helical guide channel 2501 spans less than or equal to one quarter of a circumference. In this embodiment, the guide rib 270 has a fan shape. Alternatively, in other embodiments, the helical guide channel 2501 spans more than one-quarter of a circumference. In this embodiment, the guide rib 270 has a spiral shape.

Optionally, the helical guide channel 2501 spans more than one twelfth of the circumference and less than or equal to one quarter of the circumference.

Optionally, the helical guide channel 2501 spans more than one-eighth of a circle and less than or equal to one-quarter of a circle.

Optionally, the helical guide channel 2501 spans more than one sixth of the circumference and less than or equal to one quarter of the circumference.

Optionally, the helical guide channel 2501 spans more than one quarter of the circumference and less than or equal to one half of the circumference.

Optionally, the helical guide channel 2501 spans more than one quarter of the circumference and less than or equal to one third of the circumference.

In the embodiment of the present disclosure, the larger the span of the spiral guide channel 2501 is, the smoother the air duct of the spiral guide channel 2501 is, the more the tangential direction of the air outlet edge approaches to be perpendicular to the axial direction, the stronger the rotation of the air flow entering the outer cylinder 250 is, the larger the centrifugal force is, and the higher the liquid removing efficiency is.

In the embodiment of the present disclosure, the wall surface of the spiral guide channel 2501 is in smooth transition, so as to ensure smooth circulation of the intake air and reduce the flow resistance. The formation of the wall surface of the spiral guide channel 2501 is determined by the shape of the guide rib 270, and the configuration of the guide rib 270 may be determined as needed according to the shape of the guide channel 2501 needed.

In some embodiments, the guide rib 270 has an inner edge connected to the outer wall of the inner cylinder 260 and an outer edge connected to the inner wall of the outer cylinder 250.

In the embodiment of the present disclosure, the number of the guide ribs 270 is not limited, and may be determined according to actual situations. Optionally, the guiding rib 270 is one or more, for example, 1, 2, 3, 4, 5, 6 or more, without limitation. As shown in fig. 9, the number of the guide fins 270 is 8, and the guide fins are uniformly distributed in the annular channel 204; wherein, the 8 guide fins 270 are defined as a first guide fin 271, a second guide fin 272, a third guide fin 273, a fourth guide fin 274, a fifth guide fin 275, a sixth guide fin 276, a seventh guide fin 277, and an eighth guide fin 278 in this order. The 8 guide fins 270 divide the annular inlet channel 205 into 8 guide channels 2051 (as shown in fig. 11), each guide fin 270 spanning one quarter of a circumference.

In some embodiments, as shown in fig. 12, the guide ribs 270 are inclined toward the inner wall of the outer cylinder 250. The airflow can flow along the inner wall of the outer cylinder 250, the centrifugal force is increased, and the liquid removing efficiency is improved.

In some embodiments, as shown in fig. 10 and 11, the second port 262 of the inner cylinder 260 extends into the outer cylinder 250 a length greater than or equal to the length h of the guide rib 270 extending into the outer cylinder 250. The rotary airflow formed after the flow is guided by the guide channels can further strengthen the circumferential operation under the action of the lower part of the annular channel.

In some embodiments, as shown in connection with fig. 10, the liquid phase outlet 202 of the second open end of the outer cylinder 250 is necked down. That is, a throat-shaped transition portion is provided between the main body of the outer cylinder 250 and the liquid phase outlet 202. Optionally, the tapered transition portion is a cone, and a large-caliber opening end of the cone is communicated with the main body of the outer cylinder 250, and the small-caliber opening end is the liquid phase outlet 202. Optionally, the liquid phase outlet 202 is a tapered liquid phase outlet. Optionally, the taper is a frustoconical taper.

The embodiment of the present disclosure provides a water chilling unit, including, the aforesaid falls mode evaporator.

In the water chilling unit disclosed by the embodiment of the disclosure, the refrigerant liquid drops carried in the gas-phase refrigerant discharged from the falling-mode evaporator can be reduced by more than 90%, the air suction liquid carrying is reduced, the unit performance cannot be reduced due to the air suction liquid carrying, and the unit performance is ensured. And the compressor does not generate liquid impact, and the damage of the unit caused by the liquid impact is avoided. By not increasing the amount of oil leakage from the compressor, the consequences of compressor damage due to increased amount of oil leakage from the compressor are not generated. In a word, the water chilling unit of the embodiment of the disclosure is reliable in operation and good in performance.

The present application is not limited to the structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. A falling film evaporator with a cyclone separation device is characterized by comprising,

a gas outlet of the body;

and a gas phase inlet of the cyclone separation device is connected with a gas phase refrigerant, and a gas phase outlet is connected with the gas outlet of the body.

2. The falling film evaporator according to claim 1, wherein the cyclone separation device comprises,

the top wall of the cylinder is provided with a gas phase outlet, the lower end of the cylinder is provided with a liquid phase outlet, and the side wall of the cylinder is provided with a gas phase inlet;

one end of the air inlet pipe is connected with the gas-phase inlet of the cylinder, and the other end of the air inlet pipe is connected with a gas-phase refrigerant; and the air inlet pipe is tangent to the side wall of the cylinder body.

3. The falling film evaporator according to claim 2, wherein the liquid phase outlet of the drum is necked.

4. The falling film evaporator according to claim 2, wherein the cyclone device further comprises,

and the guide structure is arranged on the inner wall of the cylinder and is used for guiding the gas-phase refrigerant entering from the gas-phase inlet to flow along the inner wall of the cylinder.

5. The falling film evaporator according to any one of claims 2, 3 or 4, wherein the cyclone separation device further comprises,

the gas outlet cylinder is arranged at the gas phase outlet of the cylinder body; and an annular channel is formed between the cylinder and the annular channel.

6. The falling film evaporator according to claim 5, wherein a first end of the gas outlet cylinder extends into the cylinder, and an end surface of the first end is located at a level not higher than a level at which the gas phase inlet is located.

7. The falling film evaporator according to claim 1, wherein the cyclone separation device comprises,

an outer cylinder provided with a first open end and a second open end; wherein the second open end is provided as a liquid phase outlet;

the inner cylinder body is arranged at the first open end of the outer cylinder body, and an annular channel is formed between the inner cylinder body and the outer cylinder body; the annular channel is used as a gas phase inlet; the first port of the inner cylinder body positioned at the first opening end side of the outer cylinder body is used as a gas phase outlet;

the guide rib pieces are arranged in the annular channel and are used for dividing the annular channel into a plurality of guide channels; and a plurality of the guide channels are spiral in the same direction.

8. The falling film evaporator according to claim 7,

the span of the spiral guide channel is less than or equal to one fourth of the circumference;

alternatively, the helical guide channel spans more than one quarter of the circumference.

9. The falling film evaporator of claim 7, wherein the length of the second port of the inner cylinder extending into the outer cylinder is greater than or equal to the length of the guide fin extending into the outer cylinder.

10. A chiller, comprising a falling film evaporator according to any one of claims 1 to 9.