Evaporator

Abstract

The utility model discloses an evaporator. The evaporator comprises a shell and a filtering assembly. The shell is provided with an input port and an output port, and a heat exchange space is defined by the shell. The filter assembly is located in the heat exchange space, an exhaust area is defined by the filter assembly and the shell, the output port communicates with the exhaust area, a first filter part is arranged on the surface, opposite to the output port, of the filter assembly and comprises a plurality of bent parts connected with one another, and the bent parts are connected with the first filter part. The bending part is provided with a plurality of exhaust holes, and the size of the exhaust holes is in positive correlation with the distance between the exhaust holes and the output port in the axial direction of the evaporator. Therefore, the first filtering piece can effectively reduce the risk of liquid drop entrainment and achieve a better liquid blocking effect, so that it is ensured that the risk of liquid entrainment in air suction of the compressor is low, meanwhile, the first filtering piece can also ensure that the compressor can obtain sufficient refrigerants, and therefore it is ensured that the compressor can operate normally.

Description

Technical Field

[0001] This application relates to the field of evaporator technology, and more specifically, to an evaporator. Background Technology

[0002] The working principle of a flooded evaporator is as follows: the heat exchange tubes of the evaporator are immersed in refrigerant. The refrigerant boils and evaporates outside the heat exchange tubes, achieving heat exchange. The evaporated gaseous refrigerant rises into the gas space inside the evaporator and then enters the compressor, thus realizing the refrigeration cycle. When the compressor's suction volume is large, the risk of liquid carryover in the suction is high. Liquid carryover can cause liquid droplets to enter the compressor, causing damage. Therefore, how to effectively reduce the risk of liquid carryover in the suction is an urgent problem to be solved. Utility Model Content

[0003] This application provides an evaporator.

[0004] The evaporator provided in this embodiment includes a shell and a filter assembly. The shell has an inlet and an outlet, and the shell encloses a heat exchange space. The filter assembly is located within the heat exchange space, and the filter assembly and the shell enclose an exhaust area. The outlet communicates with the exhaust area. A first filter element is provided on the surface of the filter assembly opposite to the outlet. The first filter element includes multiple interconnected bends, and each bend has multiple exhaust holes. The size of the exhaust holes is positively correlated with the distance between the exhaust holes and the outlet in the axial direction of the evaporator.

[0005] In some embodiments, the bend is V-shaped, U-shaped, or concave on the radial section of the evaporator or on the axial section of the evaporator.

[0006] In some embodiments, each of the exhaust holes has a different size, and the size of a single exhaust hole is positively correlated with the distance between the exhaust hole and the outlet in the axial direction of the evaporator; or, the bending portion includes multiple exhaust hole regions, each of the exhaust hole regions including multiple exhaust holes of the same size, and the size of the exhaust holes in the exhaust hole region is positively correlated with the distance between the exhaust hole region and the outlet in the axial direction of the evaporator.

[0007] In some embodiments, the vent area includes a first vent area and a second vent area, the first vent area including a plurality of first vents, the second vent area including a plurality of second vents, the size of the first vents being larger than the size of the second vents, and in the axial direction of the evaporator, the distance between the first vent area and the outlet is greater than the distance between the second vent area and the outlet.

[0008] In some embodiments, the bent portion is provided with an isolation zone, the isolation zone is not provided with the exhaust port, and the projection of the output port is located within the projection of the isolation zone when projected along the radial direction of the evaporator.

[0009] In some implementations, the size of the isolation zone is larger than the diameter of the output port.

[0010] In some embodiments, the first filter element includes a drain hole located at the bottom of the bend.

[0011] In some embodiments, the first filter element includes a mounting portion located between the bend and the housing in a radial section of the evaporator, and the mounting portion extends horizontally to the central axis of the housing.

[0012] In some embodiments, a second filter element is provided on the surface of the filter assembly opposite to the inlet. The second filter element includes a plurality of fixing members and a filter screen, the filter screen being located between the plurality of fixing members and the plurality of fixing members and the filter screen being arranged along the radial direction of the evaporator. The fixing members are provided with a plurality of air outlets.

[0013] In some embodiments, the filter assembly further includes two baffles, each baffle having a first connecting area and a second connecting area. The first connecting area is connected to the second connecting area and is connected to the housing, and the shape of the first connecting area matches the shape of the housing. When the filter assembly includes the first filter element and the second filter element, in the axial section of the evaporator, both sides of the first filter element and both sides of the second filter element are respectively connected to two second connecting areas, and the two baffles, the first filter element, the second filter element, and the housing together form the exhaust area. Alternatively, when the filter assembly includes the first filter element, in the axial section of the evaporator, both sides of the first filter element are respectively connected to two second connecting areas, and the two baffles, the first filter element, and the housing together form the exhaust area.

[0014] The evaporator of this application has a filter assembly inside its casing, and the filter assembly and casing form an exhaust area. The outlet is connected to the exhaust area, so all liquid refrigerant in the evaporator must pass through the filter assembly before it can move to the outlet and enter the compressor. The filter assembly includes a first filter element, which includes multiple interconnected bends. Each bend has multiple exhaust holes, and the size of the exhaust holes is positively correlated with the distance between the exhaust holes and the outlet in the axial direction of the evaporator. The bends increase the contact area between the gaseous refrigerant and the first filter element, which is beneficial for separating the gaseous refrigerant from its entrained droplets. The exhaust holes reduce the risk of droplet entrainment and ensure the amount of gaseous refrigerant entering the exhaust area and thus the compressor, thereby ensuring that the compressor can stably obtain sufficient refrigerant. In this way, the first filter element can effectively reduce the risk of droplet entrainment, achieve better liquid blocking effect, and thus ensure a low risk of liquid carryover during compressor suction. At the same time, the first filter element can also ensure that the compressor obtains sufficient refrigerant, thereby ensuring the normal operation of the compressor.

[0015] Additional aspects and advantages of embodiments of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of embodiments of this application. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0017] Figure 1 This is a schematic diagram of the axial cross-section of an evaporator according to certain embodiments of this application;

[0018] Figure 2 yes Figure 1 The diagram shows a radial cross-section of the evaporator.

[0019] Figure 3 yes Figure 1 The diagram shows the structure of the first filter element.

[0020] Figure 4 yes Figure 1 The diagram shows the structure of the second filter element.

[0021] Figure 5 yes Figure 4 The diagram shows a detailed structural diagram of the second filter element.

[0022] Figure 6 yes Figure 1 The diagram shows the structural details of the baffle.

[0023] Description of main component symbols:

[0024] 100. Evaporator;

[0025] 10. Shell; 11. Inlet; 12. Outlet; 13. Heat exchange space; 131. Exhaust area; 132. Evaporation area;

[0026] 20. Filter assembly; 21. First filter element; 211. Bending portion; 212. Vent; 2121. First vent; 2122. Second vent; 213. Vent area; 2131. First vent area; 2132. Second vent area; 214. Isolation area; 215. Drain hole; 216. Mounting part; 22. Second filter element; 221. Fixing element; 2211. Air inlet; 222. Filter screen; 23. Baffle; 231. First connection area; 232. Second connection area;

[0027] 30. Heat exchange tubes. Detailed Implementation

[0028] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0029] In the description of this application, it should be understood that the terms "thickness," "upper," "top," "bottom," "inner," "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "linkage" should be interpreted broadly. In one example, they can be a fixed connection, a detachable connection, or an integral connection; they can be a mechanical connection, an electrical connection, or a connection that allows communication between them; they can be a direct connection or an indirect connection through an intermediate medium; they can be the internal connection of two elements or the interaction between two elements.

[0031] In embodiments of this application, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] The commonly used evaporator types in air conditioning equipment are flooded evaporators, falling film evaporators, and dry-type evaporators. Among them, flooded evaporators are widely used due to their simple manufacturing process and good heat transfer performance. The working principle of a flooded evaporator is as follows: the heat exchange tubes of the evaporator are immersed in refrigerant. The refrigerant boils and evaporates outside the heat exchange tubes, achieving heat exchange. The evaporated gaseous refrigerant rises into the gas space inside the evaporator and then enters the compressor, thus realizing the refrigeration cycle. Typically, a flooded evaporator leaves 1 / 2 to 1 / 3 of its space in gas space. Compared to falling film evaporators, flooded evaporators require a larger refrigerant charge and a sufficiently large cylinder to ensure enough space at the top for gas, which also increases the cost of the evaporator.

[0033] When the compressor has a large suction volume, the risk of liquid carryover in the suction air is high. Liquid carryover can lead to droplets entering the compressor and causing damage. Therefore, effectively avoiding this risk is a pressing issue. For example, centrifugal compressors have large suction volumes and high heat exchange rates, resulting in a large number of heat exchanger tubes and a high risk of liquid carryover. Liquid carryover can cause droplets to enter the compressor and damage it. In the industry, to avoid liquid carryover caused by the large suction volume of centrifugal compressors, the cylinder is usually enlarged to increase the distance between the liquid level and the suction port. In summary, flooded evaporators used in centrifugal chillers suffer from the disadvantages of large cylinder size and high refrigerant charge.

[0034] Please see Figures 1 to 3The evaporator 100 provided in this embodiment includes a housing 10 and a filter assembly 20. The housing 10 has an inlet 11 and an outlet 12, and the housing 10 encloses a heat exchange space 13. The filter assembly 20 is located within the heat exchange space 13, and the filter assembly 20 and the housing 10 enclose an exhaust region 131. The outlet 12 communicates with the exhaust region 131. A first filter element 21 is provided on the surface of the filter assembly 20 opposite to the outlet 12. The first filter element 21 includes a plurality of interconnected bends 211, and the bends 211 are provided with a plurality of exhaust holes 212. The size of the exhaust holes 212 is positively correlated with the distance between the exhaust holes 212 and the outlet 12 in the axial direction of the evaporator 100.

[0035] Specifically, the heat exchange tubes 30 of the evaporator 100 are immersed in the refrigerant. The refrigerant boils and evaporates outside the heat exchange tubes 30 to achieve heat exchange. The evaporated gaseous refrigerant rises into the gaseous space inside the evaporator 100 and then enters the compressor, thereby realizing the refrigeration cycle.

[0036] The housing 10 has a cavity (i.e., heat exchange space 13) for accommodating other components. Other components of the evaporator 100 can be installed inside the housing 10. The housing 10 can be used to isolate other components of the evaporator 100 from the outside world to prevent them from being easily damaged by external forces and to prevent external impurities, such as dust, from entering the other components and affecting their normal operation.

[0037] The inlet 11 of the housing 10 is connected to the condenser of the air conditioning system, and the outlet 12 of the housing 10 is connected to the compressor of the air conditioning system. The evaporator 100 has multiple heat exchange tubes 30 inside to form a tube distribution area, which can be understood as being located within the evaporation area 132.

[0038] The filter assembly 20 is a device capable of effectively separating and removing specific components from a mixture. The filter assembly 20 is located within the heat exchange space 13. The filter assembly 20 and the housing 10 enclose an exhaust region 131. The outlet 12 connects to the exhaust region 131. The area within the heat exchange space 13 outside the exhaust region 131 is the evaporation region 132. The refrigerant in the evaporation region 132 must pass through the filter assembly 20 before entering the exhaust region 131 and subsequently the compressor.

[0039] The surface of the filter assembly 20 opposite to the output port 12 is provided with a first filter element 21. The first filter element 21 includes multiple interconnected bends 211. The multiple bends 211 can be arranged radially along the evaporator 100 or axially along the evaporator 100. The radial direction of the evaporator 100 refers to the direction perpendicular to the central axis of the housing 10, and the axial direction refers to the direction parallel to the central axis of the housing 10. On the radial or axial cross-section of the evaporator 100, the bends 211 are V-shaped, U-shaped, or concave to effectively increase the contact area between the gaseous refrigerant and the first filter element 21, which is beneficial for separating the gaseous refrigerant from its entrained droplets (i.e., liquid refrigerant), thereby achieving a better liquid-blocking effect and reducing the risk of liquid carryover during compressor suction.

[0040] Multiple exhaust holes 212 are provided on both sides or either side of the bent portion 211. The size of the exhaust hole 212 is positively correlated with the distance between the exhaust hole 212 and the outlet 12 in the axial direction of the evaporator 100, that is, the closer the distance, the smaller the size of the exhaust hole 212. In one embodiment, each exhaust hole 212 has a different size, and the size of a single exhaust hole 212 is positively correlated with the distance between the exhaust hole 212 and the outlet 12 in the axial direction of the evaporator 100, that is, each exhaust hole 212 has a different size, and the exhaust hole 212 closer to the outlet 12 has a smaller size. In another embodiment, the bending portion 211 includes a plurality of vent regions 213, each vent region 213 including a plurality of vents 212 of the same size, that is, the vents 212 in each vent region 213 are the same, and the size of the vents 212 in the vent region 213 is positively correlated with the distance between the vent region 213 and the outlet 12 in the axial direction of the evaporator 100, and the size of the vents 212 in the vent region 213 closer to the outlet 12 is smaller.

[0041] It is understandable that the gas velocity is greater closer to the outlet 12 in the exhaust zone 131, causing the refrigerant to pass through the first filter element 21 faster. If a larger exhaust hole 212 is provided in the area of ​​the first filter element 21 near the outlet 12, then gaseous refrigerant carrying liquid droplets may directly pass through the exhaust hole 212 and enter the exhaust zone 131, thereby entering the compressor and causing liquid slugging.

[0042] In the first filter element 21, the size of the exhaust port 212 closer to the outlet 12 in the axial direction of the evaporator 100 is smaller. This effectively reduces the gas flow velocity in the region of the first filter element 21 near the outlet 12, thereby effectively reducing the risk of liquid droplet entrainment of gaseous refrigerant passing through this region and ensuring that the region of the first filter element 21 near the outlet 12 also achieves a good liquid-blocking effect. Simultaneously, in the first filter element 21, the gas flow velocity is slower in the region of the first filter element 21 further away from the outlet 12 in the axial direction of the evaporator 100. The risk of liquid droplet entrainment when gaseous refrigerant passes through this region is lower. Therefore, even if the size of the exhaust port 212 in this region is set larger, it will not lead to a higher risk of liquid droplet entrainment of gaseous refrigerant. At the same time, it also ensures a larger flow rate of gaseous refrigerant passing through this region, thereby ensuring that a sufficient amount of gaseous refrigerant enters the compressor, allowing the compressor to operate normally.

[0043] Liquid refrigerant flows out from the condenser and enters the evaporator 100 through inlet 11. After entering the evaporator 100, the liquid refrigerant first reaches the evaporation zone 132 and comes into contact with the heat exchange tubes 30 in the tube distribution area, where it boils and evaporates outside the heat exchange tubes 30 to form gaseous refrigerant. The evaporated gaseous refrigerant can then pass through the first filter element 21 to enter the exhaust zone 131. During the process of passing through the first filter element 21, the size of the exhaust port 212 in the first filter element 21, which is closer to the outlet 12 in the axial direction of the evaporator 100, is smaller. This effectively reduces the risk of liquid droplet entrainment in the gaseous refrigerant and ensures the flow rate of gaseous refrigerant entering the exhaust zone 131 and thus the compressor, thereby ensuring that the compressor can stably obtain a sufficient amount of gaseous refrigerant. At the same time, the design of the bend 211 increases the contact area between the gaseous refrigerant and the first filter element 21, further reducing the risk of liquid droplet entrainment. Therefore, the first filter element 21 has a better liquid-blocking effect. After the gaseous refrigerant passes through the first filter element 21, the first filter element 21 can effectively prevent liquid refrigerant from entering the exhaust area 131, so that most of the exhaust area 131 is filled with gaseous refrigerant. Then the gaseous refrigerant can enter the compressor through the outlet 12, which reduces the risk of liquid being carried into the compressor during intake.

[0044] The evaporator 100 of this embodiment has a filter assembly 20 inside its housing 10, and the filter assembly 20 and the housing 10 form an exhaust region 131. The outlet 12 communicates with the exhaust region 131. Therefore, the liquid refrigerant in the evaporator 100 must pass through the filter assembly 20 before it can move to the outlet 12 and enter the compressor. The filter assembly 20 includes a first filter element 21, which includes multiple interconnected bends 211. Each bend 211 has multiple exhaust holes 212. The size of the exhaust holes 212 is positively correlated with the distance between the exhaust holes 212 and the outlet 12 in the axial direction of the evaporator 100. The design of the bends 211 increases the contact area between the gaseous refrigerant and the first filter element 21, which is beneficial for separating the gaseous refrigerant from its entrained droplets. The design of the exhaust holes 212 reduces the risk of droplet entrainment and ensures the amount of gaseous refrigerant entering the exhaust region 131 and thus the compressor, thereby ensuring that the compressor can stably obtain sufficient refrigerant. In this way, the first filter element 21 can effectively reduce the risk of liquid droplet entrainment and achieve a better liquid blocking effect, thereby ensuring that the risk of liquid entrainment in the compressor intake is low. At the same time, the first filter element 21 can also ensure that the compressor can obtain sufficient refrigerant, thereby ensuring that the compressor can operate normally.

[0045] Furthermore, the evaporator 100 of this application has a better anti-suction and liquid-carrying effect, which allows for a reduction in the gas space above the evaporator 100 during its design. This results in a smaller evaporator 100 volume and a more compact overall air conditioning unit structure, effectively saving costs and customer site space. Therefore, the evaporator 100 of this application is suitable for air conditioning units that include centrifugal compressors, resulting in a large suction volume and a large number of heat exchange tubes 30.

[0046] Please see Figure 2 In some embodiments, the number of bends 211 is within a first quantity range [2, 10], for example, 2, 4, 6, 9, or 10. If the number of bends 211 is too small, for example, only 1, the contact area between the gaseous refrigerant and the first filter element 21 is small, which is not conducive to blocking liquid droplets entrained in the gaseous refrigerant. If the number of bends 211 is too large, for example, 13, the cost of the first filter element 21 will be high, and the excessive number of bends 211 may also lead to processing difficulties. Therefore, the number of bends 211 can be determined within the first quantity range according to the actual needs of the compressor, so as to ensure that there is a large contact area between the gaseous refrigerant and the first filter element 21, which is conducive to reducing the risk of liquid droplet entrainment, and to ensure that the manufacturing cost of the first filter element 21 is not high and the processing is simple.

[0047] Please see Figure 2 and Figure 3In some embodiments, the exhaust port area 213 includes a first exhaust port area 2131 and a second exhaust port area 2132. The first exhaust port area 2131 includes a plurality of first exhaust ports 2121, and the second exhaust port area 2132 includes a plurality of second exhaust ports 2122. The size of the first exhaust ports 2121 is larger than the size of the second exhaust ports 2122. In the axial direction of the evaporator 100, the distance between the first exhaust port area 2131 and the output port 12 is greater than the distance between the second exhaust port area 2132 and the output port 12.

[0048] Specifically, the bending portion 211 can be provided with two types of vent areas 213, namely a first vent area 2131 and a second vent area 2132. In the axial direction of the evaporator 100, the distance between the first vent area 2131 and the outlet 12 is greater than the distance between the second vent area 2132 and the outlet 12. Therefore, the size of the first vent 2121 in the first vent area 2131 is larger than the size of the second vent 2122 in the second vent area 2132. At the same time, all first vents 2121 and all second vents 2122 are the same size. The size of the first vent 2121 can be determined according to the flow rate of the gaseous refrigerant when it passes through the first vent area 2131, so as to ensure that the liquid droplets entrained in the gaseous refrigerant passing through the first vent area 2131 can be blocked by the first vent area 2131, while ensuring that the amount of gas passing through the first vent area 2131 is not small. The size of the second exhaust port 2122 can be determined according to the flow rate of the gaseous refrigerant when it passes through the second exhaust port area 2132, so as to ensure that the liquid droplets entrained in the gas passing through the second exhaust port area 2132 can be blocked by the second exhaust port area 2132.

[0049] Furthermore, on the axial cross-section of the evaporator 100, the bend 211 can be divided into two installation areas centered on the outlet 12, and a first exhaust port area 2131 and a second exhaust port area 2132 can be provided in the two installation areas. If the distance between a certain installation area and the outlet 12 in the axial direction of the evaporator 100 is small, then the second exhaust port area 2132 can be provided only in that area, and the number of second exhaust ports 2122 in the two second exhaust port areas 2132 can be different, for example... Figure 3 The number of second exhaust holes 2122 in the second exhaust hole area 2132 on the left is two, and the number of second exhaust holes 2122 in the second exhaust hole area 2132 on the right is four.

[0050] Thus, a first exhaust port area 2131 and a second exhaust port area 2132 are provided in the bending section 211, and the size of the exhaust port 212 in the exhaust port area 213 closer to the outlet 12 is smaller, which can effectively reduce the gas flow rate of the second exhaust port area 2132, thereby reducing the risk of droplet entrainment. At the same time, it can also ensure that the gas flow of the first exhaust port area 2131, which has a lower risk of droplet entrainment, is not too small, thereby ensuring that sufficient gaseous refrigerant can pass through the first filter element 21 and enter the compressor.

[0051] Please see Figure 3 In some embodiments, the shape of the first exhaust port 2121 can be various, such as square, circular, elliptical, or irregular. The size of the first exhaust port 2121 is determined according to the performance of the compressor. The size of the first exhaust port 2121 affects the speed at which the gaseous refrigerant passes through it. If the size of the first exhaust port 2121 is too large, there may be a greater risk of liquid refrigerant carrying over to the first exhaust port 2121. If the size of the first exhaust port 2121 is too small, the gas flow rate through it will be too small, thereby affecting the compressor's suction capacity.

[0052] In one embodiment, the first exhaust hole 2121 is circular, and the diameter of the first exhaust hole 2121 is within a first diameter range [15mm, 100mm]. For example, the diameter of the first exhaust hole 2121 is 15mm, 20mm, 34mm, 48mm, 54mm, 63mm, 78mm, 84mm, 96mm or 100mm.

[0053] In another embodiment, the first exhaust hole 2121 is square, and the side length of the first exhaust hole 2121 is located within the first side length range [15mm, 100mm]. For example, the side length of the first exhaust hole 2121 is 15mm, 24mm, 36mm, 45mm, 58mm, 66mm, 73mm, 88mm, 94mm or 100mm.

[0054] When there are multiple first exhaust holes 2121, the shapes of the multiple first exhaust holes 2121 can be the same or different. For example, the multiple first exhaust holes 2121 are all square, or some first exhaust holes 2121 are round and some first exhaust holes 2121 are square.

[0055] Thus, the shape of the first vent hole 2121 can be determined as needed, and the size of the first vent hole 2121 can be determined according to the first diameter range or the first side length range, so as to ensure that the liquid blocking effect of the first filter element 21 is good, thereby effectively reducing the risk of liquid carryover.

[0056] Please see Figure 3In some embodiments, the shape of the second exhaust port 2122 can be various, such as square, circular, elliptical, or irregular. The size of the second exhaust port 2122 is determined according to the performance of the compressor. The size of the second exhaust port 2122 affects the speed at which the gaseous refrigerant passes through it. If the size of the second exhaust port 2122 is too large, there may be a greater risk of liquid carryover; if the size of the second exhaust port 2122 is too small, the gas flow rate through it will be too small, thereby affecting the compressor's suction capacity.

[0057] In one embodiment, the second vent 2122 is circular, and the diameter of the second vent 2122 is within a second diameter range [5mm, 60mm]. For example, the diameter of the second vent 2122 is 5mm, 16mm, 24mm, 37mm, 43mm, 57mm, or 60mm.

[0058] In another embodiment, the second vent 2122 is square, and the side length of the second vent 2122 is located within the second side length range [5mm, 60mm]. For example, the side length of the second vent 2122 is 5mm, 13mm, 27mm, 34mm, 49mm, 58mm or 60mm.

[0059] When there are multiple second exhaust holes 2122, the shapes of the multiple second exhaust holes 2122 can be the same or different. For example, multiple second exhaust holes 2122 are all square, or some second exhaust holes 2122 are round and some second exhaust holes 2122 are square.

[0060] Thus, the shape of the second vent 2122 can be determined as needed, and the size of the second vent 2122 can be determined according to the second diameter range or the second side length range, so as to ensure that the liquid blocking effect of the first filter element 21 is good, thereby effectively reducing the risk of liquid carryover.

[0061] Please see Figure 3 In some embodiments, the number of second vent holes 2122 is within a second quantity range [2, 6], for example, 2, 3, 4, 5, or 6. Too few second vent holes 2122 and too many first vent holes 2121 will increase the risk of liquid carryover, while too many second vent holes 2122 may result in too few first vent holes 2121, leading to insufficient gas flow through the first filter element 21. Therefore, determining the number of second vent holes 2122 within the second quantity range based on the compressor's suction capacity can effectively reduce the risk of liquid carryover while ensuring that the cost of the first filter element 21 is not excessive.

[0062] Please see Figure 1 and Figure 3In some embodiments, the bending portion 211 is provided with an isolation zone 214, which is not provided with an exhaust port 212. The projection of the outlet 12 is located within the projection of the isolation zone 214 when projected along the radial direction of the evaporator 100.

[0063] Specifically, the gas flow velocity near the outlet 12 is relatively high. If an exhaust port 212 is provided in the area of ​​the bending section 211 corresponding to the area directly below the outlet 12, the gaseous refrigerant carrying liquid droplets may pass directly and quickly through the exhaust port 212. Therefore, the risk of liquid droplet entrainment of gaseous refrigerant passing through the area of ​​the bending section 211 that is close to the outlet 12 is relatively high.

[0064] Therefore, an isolation zone 214 without holes can be provided in the bending portion 211. Projected along the radial direction of the evaporator 100, the projection of the outlet 12 is located within the projection of the isolation zone 214. That is, the isolation zone 214 is provided in the bending portion 211, directly below the outlet 12, or in the area directly below and near the outlet 12. This prevents the gaseous refrigerant from passing through the first filter element 21 from the area with a large gas flow velocity, thereby effectively reducing the risk of droplet entrainment and improving the liquid blocking effect of the first filter element 21.

[0065] Furthermore, when setting each vent area 213, the bending portion 211 can be divided into three parts with the isolation area 214 as the center: the isolation area 214 and the setting areas distributed on both sides of the isolation area 214. The vent areas 213 are set according to the distance between each area of ​​the setting area and the outlet 12. The vent areas 213 set in the two setting areas can be the same or different. For example, both setting areas have a first vent area and a second vent area. Or, one setting area has a first vent area and a second vent area, while the other setting area only has a second vent area. In this way, the vents 212 and the isolation area 214 can be set in a targeted manner according to the distance between each area of ​​the bending portion 211 and the outlet 12 in the axial direction of the evaporator 100, so as to effectively reduce the airflow velocity near the outlet 12, thereby helping to reduce the risk of liquid carryover.

[0066] Please see Figure 1 and Figure 3In some embodiments, the size of the isolation zone 214 is larger than the diameter of the outlet 12, such that the isolation zone 214 is provided in the area directly below and near the outlet 12 in the bend 211. In one embodiment, the difference between the size of the isolation zone 214 and the diameter of the outlet 12 is within the range of [20mm, 60mm], for example, 20mm, 35mm, 42mm, 55mm, or 60mm. Thus, the isolation zone 214 is provided in the area directly below and near the outlet 12 in the bend 211, ensuring that no exhaust holes 212 are provided in areas of the bend 211 with high gas flow velocity, thereby effectively reducing the gas flow velocity near the outlet 12 and ensuring better liquid-blocking effect of the first filter element 21.

[0067] Please see Figure 1 and Figure 3 In some embodiments, the first filter element 21 includes a drain hole 215, which is disposed at the bottom of the bend 211.

[0068] Specifically, the gaseous refrigerant may condense into liquid refrigerant in the exhaust area 131, and a small amount of liquid refrigerant may still pass through the first filter element 21 and enter the exhaust area 131 along with the gaseous refrigerant. This liquid refrigerant may fall back to the bottom of the bend 211, so that liquid refrigerant may accumulate at the bottom of the bend 211.

[0069] Therefore, the bottom of the bending section 211 may be provided with a drain hole 215 that penetrates the bottom of the bending section 211, so that the liquid refrigerant that falls to the bottom of the bending section 211 can return to the evaporation area 132 for evaporation along the drain hole 215, thereby preventing the liquid refrigerant from accumulating at the bottom of the bending section 211 and being carried into the outlet 12 by the gaseous refrigerant, thus entering the compressor and causing the risk of liquid being carried in the suction, thereby improving the safety of the compressor.

[0070] Furthermore, the drain hole 215, the first vent hole 2121, and the second vent hole 2122 can be arranged in an alternating manner, that is, the drain hole 215, the first vent hole 2121, and the second vent hole 2122 can be distributed in different areas of the bending portion 211 and have a certain distance between them, so that the drain hole 215, the first vent hole 2121, and the second vent hole 2122 do not interfere with each other during processing, and even if the size of one hole changes, it will not affect the processing of other holes.

[0071] Please see Figure 2 and Figure 3In some embodiments, the shape of the drain hole 215 can be various, such as square, circular, elliptical, or irregular. If the size of the drain hole 215 is too large, the gaseous liquid in the evaporation zone 132 may directly enter the exhaust zone 131 through the drain hole 215, resulting in a high risk of liquid carryover. Conversely, if the size of the drain hole 215 is too small, it will lead to manufacturing difficulties. Therefore, the size of the exhaust hole 212 needs to be specifically determined based on the manufacturing process and the performance of the compressor.

[0072] In one embodiment, the drain hole 215 is circular, and the diameter of the drain hole 215 is within a third diameter range [3mm, 10mm]. For example, the diameter of the drain hole 215 is 3mm, 5.5mm, 6.21mm, 7.58mm, 8.17mm, 9.24mm or 10mm.

[0073] In another embodiment, the drain hole 215 is square, and the side length of the drain hole 215 is located within the third side length range [3mm, 15mm]. For example, the side length of the drain hole 215 is 3mm, 5.78mm, 6.24mm, 8.25mm, 9.67mm, 10.25mm, 13.64mm or 15mm.

[0074] Thus, the size of the drain hole 215 can be determined according to the third diameter range or the third side length range, so as to ensure that the liquid refrigerant at the bottom of the bent part 211 can return to the evaporation area 132 through the drain hole 215, while ensuring that the processing of the first filter element 21 is more convenient.

[0075] Please see Figure 2 and Figure 3 In some embodiments, the first filter element 21 includes a mounting portion 216. In the radial section of the evaporator 100, the mounting portion 216 is located between the bending portion 211 and the housing 10. That is, in the radial section of the evaporator 100, one side of the mounting portion 216 is connected to the housing 10, and the other side is connected to the outermost bending portion 211 among a plurality of bending portions 211. It can be understood that there are at least two mounting portions 216, which are respectively connected to the two outermost bending portions 211. The extending direction of the mounting portion 216 is horizontal to the central axis of the housing 10. The mounting portion 216 can be considered as a horizontal structure, which is beneficial for clamping the first filter element 21 by clamping the mounting portion 216 when installing the first filter element 21. The horizontal structure of the mounting element is easy to clamp and install, thereby facilitating the assembly of the first filter element 21 with the housing 10.

[0076] Please see Figure 2 and Figure 3In some embodiments, the length of the mounting portion 216 is within the length range [15mm, 200mm], for example, 15mm, 26mm, 58mm, 73mm, 94mm, 100mm, 123mm, 174mm, 188mm, or 200mm. If the length of the mounting portion 216 is less than 15mm, it may cause difficulties in assembling the first filter element 21 and the housing 10. If the length of the mounting portion 216 is greater than 200mm, it may cause the number of bends 211 in the first filter element 21 to be too small, thereby affecting the liquid-blocking effect of the first filter element 21. Therefore, it is necessary to determine the length of the mounting portion 216 within the length range to ensure that the assembly between the first filter element 21 and the housing 10 is simple on the one hand, and to ensure that the first filter element 21 has a better liquid-blocking effect on the other hand.

[0077] Please see Figure 1 , Figure 4 and Figure 5 In some embodiments, a second filter element 22 is provided on the surface of the filter assembly 20 opposite to the inlet 11. The second filter element 22 includes a plurality of fixing members 221 and a filter screen 222. The filter screen 222 is located between the plurality of fixing members 221, and the plurality of fixing members 221 and the filter screen 222 are arranged along the radial direction of the evaporator 100. A plurality of air outlets 2211 are provided on the fixing members 221.

[0078] Specifically, to improve the filtration effect of the filter assembly 20, a second filter element 22 may be provided on the filter assembly 20. The second filter element 22 is located on the surface of the filter assembly 20 opposite to the inlet 11, such that the distance between the second filter element 22 and the outlet 12 along the radial direction of the evaporator 100 is greater than the distance between the first filter element 21 and the outlet 12. Therefore, the gaseous refrigerant in the evaporation zone 132 needs to be filtered by the second filter element 22 first, then enter the first filter element 21 for filtration, and only then can it enter the exhaust zone 131.

[0079] The second filter element 22 includes multiple fixing members 221 and a filter screen 222. The filter screen 222 is located between the fixing members 221 to fix the filter screen 222, ensuring that the filter screen 222 will not loosen, thereby ensuring that the filter screen 222 can stably perform its filtering function. At the same time, the fixing members 221 also facilitate the assembly between the second filter element 22 and the housing 10. The multiple fixing members 221 and the filter screen 222 are arranged along the radial direction of the evaporator 100. Taking two fixing members 221 as an example, one fixing member 221 faces the evaporation area 132 and the other fixing member 221 faces the exhaust area 131, with the filter screen 222 located between the two fixing members 221. Multiple air inlets 2211 are opened on the fixing members 221. The filter screen 222 can form multiple filter holes. In the mixture passing through the filter screen 222, substances with a size larger than the size of the filter holes will be trapped by the filter screen 222.

[0080] As the gaseous refrigerant in the evaporation zone 132 moves towards the outlet 12, it first enters the filter 222 through the gas inlet 2211 in the fixture 221 facing the evaporation zone 132. During its passage through the filter 222, a large amount of liquid refrigerant is trapped by the filter holes, while the gaseous refrigerant passes through the filter holes and exits the second filter 22 through the gas inlet 2211 in the fixture 221 facing the exhaust zone 131, then enters the first filter 21. It can be understood that under the filtration of the second filter 22, only a small amount of liquid refrigerant enters the first filter 21. Under the filtration of the first filter 21, most of the liquid refrigerant entering the first filter 21 is also trapped by the first filter 21, ensuring that the refrigerant ultimately entering the exhaust zone 131 is predominantly gaseous refrigerant. This reduces the risk of liquid refrigerant entering the compressor, thereby reducing the risk of liquid being carried into the compressor's intake.

[0081] Thus, the two-stage filtration system, consisting of the first filter element 21 and the second filter element 22, effectively prevents liquid carryover during air intake, thereby reducing the operational risks of the compressor.

[0082] It should be noted that the first filter element 21 has a better filtration effect, therefore the second filter element 22 can be selected for inclusion or exclusion depending on the compressor's performance. When the compressor's suction volume is small, the filtration effect of the first filter element 21 is considered sufficient to effectively reduce the risk of liquid carryover during compressor suction; therefore, the filter assembly 20 may only include the first filter element 21. When the compressor's suction volume is large, the filtration effect of the first filter element 21 is considered insufficient to effectively reduce the risk of liquid carryover during compressor suction; therefore, the filter assembly 20 may include both the first filter element 21 and the second filter element 22. In this way, the optional second filter element 22 allows for a customized evaporator 100 configuration, enabling cost-effectiveness while ensuring effective reduction of the risk of liquid carryover during compressor suction; that is, reducing the cost of the second filter element 22 when only the first filter element 21 is used.

[0083] Please see Figure 4 and Figure 5In some embodiments, the wire diameter of the filter screen 222 is within the range of [0.1 mm, 0.2 mm], for example, 0.1 mm, 0.12 mm, 0.15 mm, 0.17 mm, or 0.2 mm. The wire diameter of the filter screen 222 refers to the diameter of the metal wires in the filter screen 222; different metal wires can form filter pores. A larger wire diameter results in higher strength of the filter screen 222, but lower filtration accuracy; a smaller wire diameter increases filtration accuracy, but may decrease strength and durability. The wire diameter affects the size of the filter pores; a larger wire diameter results in larger filter pores, and vice versa. Therefore, selecting a suitable wire diameter depends on the specific application requirements.

[0084] If the wire diameter of filter screen 222 is too small, for example, 0.05mm, it will result in an excessively high sealing effect, leading to excessive pressure loss in evaporator 100. This will cause a drop in refrigerant pressure within evaporator 100, thereby reducing refrigerant flow and evaporation, resulting in poor performance of evaporator 100. Conversely, if the wire diameter of filter screen 222 is too large, it will result in poor filtration performance.

[0085] Therefore, when the wire diameter of the filter screen 222 is within the wire diameter range, it can ensure that the filtration effect of the filter screen 222 is better on the one hand, and the pressure loss of the filter screen 222 is smaller on the other hand, thereby ensuring that the working efficiency of the evaporator 100 is better.

[0086] Please see Figure 4 and Figure 5 In some embodiments, the thickness of the filter screen 222 is within a first thickness range [10mm, 100mm], for example, 10mm, 37mm, 51mm, 64mm, 72mm, 88mm, 94mm, or 100mm. The thickness of the filter screen 222 also affects its filtration efficiency and pressure drop. If the filter screen 222 is too thick, for example, 150mm, it will result in excessive pressure drop in the evaporator 100, thereby affecting the compressor's operating efficiency. If the filter screen 222 is too thin, it will result in poor filtration efficiency. Therefore, when the thickness of the filter screen 222 is within the first thickness range, it can ensure both good filtration efficiency and low pressure drop, thereby ensuring good operating efficiency of the evaporator 100.

[0087] Please see Figure 4 and Figure 5In some embodiments, the thickness of the fastener 221 is within a second thickness range [1mm, 3mm], for example, 1mm, 1.2mm, 1.4mm, 1.7mm, 2.1mm, 2.6mm, 2.8mm, or 3mm. If the thickness of the fastener 221 is too thin, for example, 0.5mm, the fastener 221 will not be effective in securing the filter screen 222, which may cause the filter screen 222 to protrude from the air inlet 2211, thereby affecting the filtration effect of the filter screen 222. When the thickness of the fastener 221 is within the second thickness range, the fastener 221 provides a better securing effect for the filter screen 222. If the thickness of the fastener 221 is too thick, for example, 6mm, it will increase the unnecessary cost of the fastener 221. Therefore, when the thickness of the fastener 221 is within the second thickness range, it can ensure both a better securing effect of the fastener 221 and that the cost of the fastener 221 is not too high.

[0088] Please see Figure 4 and Figure 5 In some embodiments, the shape of the air inlet 2211 can be various, such as square, circular, elliptical, or irregular. The size of the air inlet 2211 affects the fixing effect of the fastener 221 and the gas flow rate. If the size of the air inlet 2211 is too large, the fixing effect of the fastener 221 on the filter screen 222 will be poor, which may cause the filter screen 222 to protrude from the air inlet 2211, thereby affecting the filtering effect of the filter screen 222. If the size of the air inlet 2211 is too small, the flow rate of the gaseous refrigerant flowing through the second filter element 22 will be slow, thereby reducing the gas flow rate to the exhaust area 131, resulting in less gaseous refrigerant in the exhaust area 131, and consequently, the compressor will not be able to obtain sufficient gaseous refrigerant. Therefore, the size of the exhaust hole 212 needs to be specifically determined according to the fixing effect of the fastener 221 and the relationship between its size and the gas flow rate.

[0089] In one embodiment, the air inlet 2211 is circular, and the diameter of the air inlet 2211 is within the fourth diameter range [40mm, 200mm]. For example, the diameter of the air inlet 2211 is 40mm, 58mm, 78mm, 89mm, 100mm, 143mm, 167mm, 183mm or 200mm.

[0090] In another embodiment, the air inlet 2211 is square, and the side length of the air inlet 2211 is located within the fourth side length range [40mm, 200mm]. For example, the side length of the air inlet 2211 is 40mm, 67mm, 82mm, 100mm, 111mm, 138mm, 174mm, 190mm or 200mm.

[0091] Thus, the size of the gas inlet 2211 can be determined according to the fourth diameter range or the fourth side length range, so as to ensure that the liquid blocking effect of the second filter element 22 is good, thereby effectively reducing the risk of liquid carrying, while ensuring that the flow speed of the gaseous refrigerant flowing through the second filter element 22 is not too slow, and that the amount of gaseous refrigerant in the exhaust area 131 is sufficient.

[0092] Please see Figure 1 and Figure 2 In some embodiments, the filter assembly 20 further includes two baffles 23, each baffle 23 having a first connecting region 231 and a second connecting region 232. The first connecting region 231 is connected to the second connecting region 232, and the first connecting region 231 is connected to the housing 10, with the shape of the first connecting region 231 matching the shape of the housing 10. For example, please refer to... Figure 6 When the housing 10 is cylindrical, the first connecting area 231 can be arc-shaped, and the baffle 23 can be semi-circular. When the housing 10 is cuboid, the first connecting area 231 can be linear, and the baffle 23 can be rectangular or square. Thus, after the first connecting area 231 is installed on the housing 10, it can prevent gaseous refrigerant from entering the exhaust area 131 from the position of the baffle 23, ensuring that the refrigerant entering the exhaust area 131 is filtered by the first filter element 21, or by the first filter element 21 and the second filter element 22.

[0093] Along the axial direction of the evaporator 100, the two sides of the filter element are connected to two second connection areas 232 respectively, so that the two baffles 23, the filter element and the housing 10 can form an exhaust area 131, and only the refrigerant that has passed through the filter element can enter the exhaust area 131.

[0094] When the filter assembly 20 includes a first filter element 21 and a second filter element 22, in the axial section of the evaporator 100, both sides of the first filter element 21 and both sides of the second filter element 22 are respectively connected to two second connection areas 232, and along the radial direction of the evaporator 100, both sides of the first filter element 21 and both sides of the second filter element 22 are connected to the housing 10. In this way, the two baffles 23, the first filter element 21, the second filter element 22 and the housing 10 together form an exhaust area.

[0095] When the filter assembly 20 includes a first filter element 21, in the axial section of the evaporator 100, the two sides of the first filter element 21 are respectively connected to two second connection areas 232, and in the radial section of the evaporator 100, the two sides of the first filter element 21 are connected to the housing 10. Thus, the two baffles 23, the first filter element 21 and the housing 10 together form an exhaust area.

[0096] In this way, the assembly between the filter assembly 20 and the housing 10 is completed, ensuring that only refrigerant that has passed through the filter can enter the exhaust zone 131, thereby ensuring that the liquid refrigerant content in the exhaust zone 131 is low and the risk of liquid carryover in the compressor intake is low.

[0097] In addition, according to the above description, the entire filter assembly 20 does not have a sealed design. The first filter element 21 has multiple vent holes 212. The thickness and wire diameter of the filter screen 222 of the second filter element 22 are determined without causing excessive pressure loss. Therefore, the sealing effect of the second filter element 22 will not be too high. This ensures that the pressure loss of the entire evaporator 100 is small, resulting in better performance of the evaporator 100.

[0098] It should be noted that the above-mentioned quantity and size limitations are all related to the specific parameters of the evaporator and compressor. The above-mentioned quantity and size limitations represent only one implementation method, but the actual quantity and size are not limited to the above-mentioned implementation method.

[0099] In the description of this specification, the references to "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0100] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the stated features. In the description of this application, "multiple" means at least two, such as two or three, unless otherwise explicitly specified.

[0101] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An evaporator, characterized in that, include: The housing has an inlet and an outlet, and the housing encloses a heat exchange space. A filter assembly is located within the heat exchange space. The filter assembly and the housing form an exhaust area. The outlet is connected to the exhaust area. A first filter element is provided on the surface of the filter assembly opposite to the outlet. The first filter element includes multiple interconnected bends. Each bend has multiple exhaust holes. The size of the exhaust holes is positively correlated with the distance between the exhaust holes and the outlet in the axial direction of the evaporator.

2. The evaporator according to claim 1, characterized in that, On the radial section of the evaporator, or on the axial section of the evaporator, the bend is V-shaped, U-shaped, or concave.

3. The evaporator according to claim 2, characterized in that, Each of the exhaust holes has a different size, and the size of a single exhaust hole is positively correlated with the distance between the exhaust hole and the outlet in the axial direction of the evaporator; or, The bending section includes multiple vent areas, each of which includes multiple vents of the same size. The size of the vents in each vent area is positively correlated with the distance between the vent area and the outlet in the axial direction of the evaporator.

4. The evaporator according to claim 3, characterized in that, The exhaust port area includes a first exhaust port area and a second exhaust port area. The first exhaust port area includes a plurality of first exhaust ports, and the second exhaust port area includes a plurality of second exhaust ports. The size of the first exhaust ports is larger than the size of the second exhaust ports. In the axial direction of the evaporator, the distance between the first exhaust port area and the output port is greater than the distance between the second exhaust port area and the output port.

5. The evaporator according to claim 1, characterized in that, The bent portion is provided with an isolation zone, which does not have the exhaust port. The projection of the outlet is located within the projection of the isolation zone when projected along the radial direction of the evaporator.

6. The evaporator according to claim 5, characterized in that, The size of the isolation zone is larger than the diameter of the output port.

7. The evaporator according to claim 1, characterized in that, The first filter element includes a drain hole, which is located at the bottom of the bend.

8. The evaporator according to claim 1, characterized in that, The first filter element includes a mounting portion located between the bent portion and the housing in a radial section of the evaporator, and the extending direction of the mounting portion is horizontal to the central axis of the housing.

9. The evaporator according to claim 1, characterized in that, The surface of the filter assembly opposite to the inlet is provided with a second filter element. The second filter element includes multiple fixing members and a filter screen. The filter screen is located between the multiple fixing members, and the multiple fixing members and the filter screen are arranged along the radial direction of the evaporator. Multiple air outlets are provided on the fixing members.

10. The evaporator according to claim 9, characterized in that, The filter assembly also includes two baffles, each baffle having a first connecting area and a second connecting area. The first connecting area is connected to the second connecting area and is connected to the housing. The shape of the first connecting area matches the shape of the housing. When the filter assembly includes the first filter element and the second filter element, in the axial section of the evaporator, both sides of the first filter element and both sides of the second filter element are respectively connected to the two second connection areas, and the two baffles, the first filter element, the second filter element and the housing together form the exhaust area; Alternatively, if the filter assembly includes the first filter element, in the axial section of the evaporator, the two sides of the first filter element are respectively connected to the two second connection areas, and the two baffles, the first filter element and the housing together form the exhaust area.

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