Evaporator and kitchen air conditioner

Abstract

The utility model relates to kitchen appliance technical field, concretely discloses an evaporator and kitchen air conditioner, in this evaporator, base has installation unit, heat exchange pipeline is used for circulating refrigerant, along the extension direction of heat exchange pipeline, a plurality of heat exchange fins are arranged at intervals, every heat exchange fin is connected with every heat exchange pipeline, a plurality of heat exchange pipelines form a plurality of row pipe groups, along the flowing direction of gas, a plurality of row pipe groups are arranged at intervals and are communicated in turn, along the flowing direction of refrigerant, the inner diameter of heat exchange pipeline in a plurality of row pipe groups increases in turn. The above setting makes the refrigerant gradually enter the bigger space in the flowing process, to adapt to the gradually increasing volume of the gradually gasification, avoids the situation that the refrigerant is faster and faster near the outlet in the flowing process, helps to realize the sufficient heat exchange with the air, improves the heat exchange efficiency, is favorable to the full gasification of refrigerant, reduces the risk of liquid knock to the compressor.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to an evaporator and a kitchen air conditioner. Background Technology

[0002] Household air conditioners, especially kitchen air conditioners, mostly use evaporators that combine heat exchange fins and pipes. In order to improve heat exchange efficiency, multiple rows of heat exchange tubes are usually installed, and the gas undergoes multiple heat exchanges as it passes through these multiple rows of heat exchange tubes.

[0003] Generally, the refrigerant in the evaporator flows sequentially through multiple rows of heat exchange tubes. During this flow, the temperature of the refrigerant gradually increases, causing the liquid refrigerant to gradually vaporize and transform into a gaseous refrigerant. Because the vaporized refrigerant requires more space, the refrigerant flows towards the evaporator outlet at a faster speed. The closer to the downstream heat exchange tube, the faster the refrigerant flows inside. When the refrigerant flows faster, the heat exchange time is shortened, and the heat exchange effect is reduced. This results in insufficient heat exchange and the presence of some liquid in the refrigerant. When the liquid refrigerant enters the compressor, it can cause liquid slugging, which can damage the compressor's lifespan.

[0004] Therefore, there is an urgent need to research an evaporator and a kitchen air conditioner to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an evaporator and a kitchen air conditioner to solve the problem of liquid slugging in the compressor caused by insufficient heat exchange of the refrigerant in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An evaporator, comprising:

[0008] The base has a mounting portion;

[0009] Several heat exchange pipes, the heat exchange pipes being used to circulate refrigerant;

[0010] A plurality of heat exchange fins are arranged at intervals along the extension direction of the heat exchange pipeline, and each heat exchange fin is connected to each heat exchange pipeline.

[0011] Several heat exchange pipes form several pipe groups. Along the gas flow direction, the several pipe groups are arranged at intervals and connected. Along the refrigerant flow direction, the inner diameter of the heat exchange pipes in the several pipe groups increases sequentially.

[0012] As an optional technical solution for the evaporator, the inner diameter of the heat exchange pipe in the air inlet side of the evaporator is larger than the inner diameter of the heat exchange pipe in the air outlet side of the evaporator.

[0013] As an optional technical solution for the evaporator, the inner diameter of the heat exchange pipes in the outlet side tube assembly of the evaporator is 5mm~7mm; and / or,

[0014] The inner diameter of the heat exchange pipes in the tube bundle between the air outlet and air inlet sides of the evaporator is 7mm~9mm; and / or,

[0015] The inner diameter of the heat exchange pipes in the air inlet side of the evaporator is 9mm~16mm.

[0016] As an optional technical solution for the evaporator, when the dryness fraction X of the refrigerant in the heat exchange pipeline is ≤0.4, the inner diameter of the heat exchange pipeline is 5mm~7mm; when the dryness fraction X of the refrigerant in the heat exchange pipeline is 0.4<X<0.8, the inner diameter of the heat exchange pipeline is 7mm~9mm; when the dryness fraction X of the refrigerant in the heat exchange pipeline is ≥0.8, the inner diameter of the heat exchange pipeline is 9mm~16mm.

[0017] As an optional technical solution for the evaporator, several heat exchange pipes form at least three rows of pipe groups, with the heat exchange pipes in adjacent rows of pipe groups arranged in a staggered manner along the gas flow direction.

[0018] As an optional technical solution for the evaporator, the base is provided with fixing holes to form an installation part, and the heat exchange pipeline passes through the fixing holes.

[0019] As an optional technical solution for the evaporator, the evaporator further includes a buffer gasket, which is sleeved on the outer periphery of the heat exchange pipeline and passes through the fixing hole. The buffer gasket is interference-fitted or bonded to the base.

[0020] As an optional technical solution for an evaporator, the base includes a fixing plate and a mounting plate. The fixing hole is opened in the fixing plate, and the mounting plate is connected to the fixing plate and arranged at an angle. The mounting plate is used to connect with external components.

[0021] A kitchen air conditioner includes a housing, a fan, and an evaporator as described in any of the above technical solutions. The housing has an air inlet and an air outlet. The fan is located inside the housing, and the outlet of the fan is connected to the air outlet. The evaporator is located inside the housing and between the air inlet and the inlet of the fan.

[0022] As an optional technical solution for kitchen air conditioning, the air inlet is located at the top of the housing, and the air outlet is located at the front of the housing.

[0023] This utility model has at least the following beneficial effects:

[0024] This utility model provides an evaporator and a kitchen air conditioner. The evaporator includes a base, several heat exchange pipes, and several heat exchange fins. The base has a mounting section; the heat exchange pipes are used for refrigerant flow; along the extension direction of the heat exchange pipes, several heat exchange fins are arranged at intervals, each fin connected to a heat exchange pipe; the several heat exchange pipes form several pipe rows, arranged sequentially and interconnected along the gas flow direction; along the refrigerant flow direction, the inner diameter of the heat exchange pipes in the pipe rows increases sequentially. This arrangement allows the refrigerant to gradually enter a larger space during flow, accommodating the gradually increasing volume due to vaporization. It avoids the situation where the refrigerant flow velocity increases closer to the outlet, ensuring sufficient heat exchange time, facilitating full heat exchange with the air, improving heat exchange efficiency, promoting full refrigerant vaporization, and reducing the risk of liquid slugging in the compressor. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0026] Figure 1 This is a first-view structural schematic diagram of the kitchen air conditioner in an embodiment of this utility model;

[0027] Figure 2 This is a structural schematic diagram of the kitchen air conditioner from a second perspective in an embodiment of this utility model;

[0028] Figure 3 This is a structural schematic diagram of the kitchen air conditioner from a third-view perspective in an embodiment of this utility model;

[0029] Figure 4 This is a schematic diagram of the evaporator from a first-view perspective in an embodiment of this utility model;

[0030] Figure 5 This is a structural schematic diagram of the evaporator from a second perspective in an embodiment of this utility model;

[0031] Figure 6 This is a structural schematic diagram of the evaporator from a third-view perspective in an embodiment of this utility model.

[0032] In the picture:

[0033] 100. Evaporator; 101. Heat exchange assembly; 110. Base; 111. Fixing plate; 112. Mounting plate; 120. Heat exchange piping; 130. Heat exchange fins; 140. Tube assembly; 150. Buffer gasket; 160. Partition;

[0034] 200. Housing; 210. Air inlet; 220. Air outlet;

[0035] 300. Fan;

[0036] 410. Main inlet pipe; 420. Branch inlet pipe; 430. Main outlet pipe; 440. Branch outlet pipe;

[0037] 500, insertion tube; 600, siphon tube. Detailed Implementation

[0038] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0039] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0040] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0041] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0042] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0043] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0044] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0045] like Figures 1 to 6 As shown, this embodiment provides an evaporator 100, which includes a base 110, a plurality of heat exchange pipes 120, and a plurality of heat exchange fins 130. The base 110 has a mounting portion; the heat exchange pipes 120 are used for refrigerant flow; along the extension direction of the heat exchange pipes 120, the plurality of heat exchange fins 130 are arranged at intervals, each heat exchange fin 130 being connected to each heat exchange pipe 120; the plurality of heat exchange pipes 120 form a plurality of pipe groups 140, which are arranged sequentially at intervals and connected along the gas flow direction, and the inner diameter of the heat exchange pipes 120 in the plurality of pipe groups 140 increases sequentially along the refrigerant flow direction.

[0046] The above configuration allows the refrigerant to gradually enter a larger space during its flow, adapting to the gradually increasing volume as it vaporizes. During the flow process, it avoids the situation where the refrigerant flow rate is faster closer to the outlet, ensuring heat exchange time, helping to achieve sufficient heat exchange with the air, improving heat exchange efficiency, facilitating the full vaporization of the refrigerant, and reducing the risk of liquid slugging on the compressor.

[0047] In some embodiments, the inner diameter of the heat exchange pipe 120 in the pipe assembly 140 on the air inlet side of the evaporator 100 is larger than the inner diameter of the heat exchange pipe 120 in the pipe assembly 140 on the air outlet side of the evaporator 100. This arrangement allows the refrigerant to enter the heat exchange pipe 120 from the air outlet side of the evaporator 100 and gradually flow towards the air inlet side. Compared to the air inlet side, the gas temperature on the air outlet side is lower, and the refrigerant temperature in the pipe assembly 140 on the air outlet side is lower than the air inlet side. Therefore, the temperature difference between the refrigerant and the gas is smaller here, making heat exchange easier and further reducing the gas temperature. Similarly, on the air inlet side, the refrigerant temperature in the heat exchange pipe 120 is higher, and the gas temperature is also higher; again, due to the smaller temperature difference, heat exchange is easier to occur.

[0048] Specifically, the inner diameter of the heat exchange pipes 120 in the tube group 140 on the air outlet side of the evaporator 100 is 5mm to 7mm. The inner diameter of the heat exchange pipes 120 in the middle tube group 140 is 7mm to 9mm. The inner diameter of the heat exchange pipes 120 in the tube group 140 on the air inlet side of the evaporator 100 is 9mm to 16mm. The middle tube group 140 is the tube group 140 between the air outlet side and the air inlet side of the evaporator 100. Exemplarily, there is one tube group 140 between the air outlet side and the air inlet side of the evaporator 100, meaning the entire evaporator 100 has three tube groups 140. In other embodiments, there may be multiple middle tube groups 140, and the diameter of the heat exchange pipes 120 in each tube group 140 is the same. In other embodiments, there may also be multiple tube groups 140 between the air outlet side and the air inlet side of the evaporator 100, and the diameter of each tube group 140 is different. The evaporator 100 may also have two tube groups 140 between the air outlet side and the air inlet side. The heat exchange tube 120 in the tube group 140 near the air inlet side has a diameter of 9 mm, and the heat exchange tube 120 in the tube group 140 near the air outlet side has a diameter of 8 mm.

[0049] It should be noted that in the above embodiments, all heat exchange pipes 120 in each pipe group 140 have the same diameter; that is, the heat exchange pipes 120 are straight tubes, and the inner diameter of all heat exchange pipes 120 in the same pipe group 140 remains unchanged. In other embodiments, the heat exchange pipes 120 are straight tubes, and the inner diameter of all heat exchange pipes 120 in the same pipe group 140 increases sequentially along the refrigerant flow direction. In some embodiments, adjacent heat exchange pipes 120 are connected by bends.

[0050] Increasing the inner diameter of the heat exchange pipe 120 can appropriately reduce the refrigerant flow rate in the downstream heat exchange pipe 120, which helps improve the heat exchange effect. However, an excessively slow flow rate can cause the refrigerant to fully vaporize and lose its heat exchange capacity, and the volume of refrigerant required throughout the cycle increases, leading to increased costs. Therefore, in some embodiments, when the dryness fraction X of the refrigerant in the heat exchange pipe 120 is ≤0.4, the inner diameter of the heat exchange pipe 120 is 5mm~7mm; when the dryness fraction X of the refrigerant in the heat exchange pipe 120 is 0.4<X<0.8, the inner diameter of the heat exchange pipe 120 is 7mm~9mm; and when the dryness fraction X of the refrigerant in the heat exchange pipe 120 is ≥0.8, the inner diameter of the heat exchange pipe 120 is 9mm~16mm. The above settings make the dryness of the refrigerant directly related to the diameter of the heat exchange pipe 120, so as to ensure that the downstream refrigerant flow rate can be reduced while avoiding the flow rate being too slow, thus reducing costs and preventing the downstream refrigerant from fully vaporizing and losing its ability to continue heat exchange.

[0051] To ensure sufficient contact between the gas and the heat exchange pipes 120, in some embodiments, several heat exchange pipes 120 form three rows of pipe groups 140, with the heat exchange pipes 120 in adjacent rows of pipe groups 140 staggered along the gas flow direction. This arrangement results in an S-shaped flow path for the gas as it passes through multiple rows of pipe groups 140. When the evaporator 100 has 4, 5, or even 10 rows of pipe groups 140, the gas flow path becomes wavy.

[0052] Along the refrigerant flow direction, the diameter of the same heat exchange pipe 120 gradually increases. This arrangement further improves the coordinated change between the diameter of the heat exchange pipe 120 and the internal gas pressure, ensuring controllable refrigerant flow velocity and improving heat exchange efficiency. Here, the diameter of the heat exchange pipe 120 refers to its internal diameter.

[0053] To ensure the connection stability between the heat exchange pipe 120 and the base 110, in some embodiments, the base 110 is provided with fixing holes to form a mounting part, and the heat exchange pipe 120 passes through the fixing holes. Specifically, there are two fixing members, with both ends of the heat exchange pipe 120 passing through two fixing holes in the two bases 110 respectively. This arrangement effectively improves the support performance of the heat exchange pipe 120 and prevents swaying when it encounters airflow.

[0054] During installation, the diameter of the fixing hole needs to be larger than that of the heat exchange pipe 120 to facilitate installation. However, if the fixing hole is too large, the heat exchange pipe 120 may wobble. Therefore, the evaporator 100 also includes a buffer gasket 150, which is fitted around the outer periphery of the heat exchange pipe 120 and passes through the fixing hole. The buffer gasket 150 is either interference-fitted or bonded to the base 110. The buffer gasket 150 is made of rubber or silicone. The buffer gasket 150 and the heat exchange pipe 120 are interference-fitted.

[0055] This embodiment also provides a kitchen air conditioner, including a housing 200, a fan 300, and an evaporator 100 as described in any of the above embodiments. The housing 200 has an air inlet 210 and an air outlet 220. The fan 300 is disposed within the housing 200, and the outlet of the fan 300 is connected to the air outlet 220. The evaporator 100 is disposed within the housing 200 and located between the air inlet 210 and the inlet of the fan 300. The structure of the evaporator 100 improves the cooling efficiency of the kitchen air conditioner and reduces the risk of liquid slugging in the compressor.

[0056] Considering that the kitchen air conditioner needs to be placed in the kitchen and is usually against the wall, the air inlet 210 is located at the top of the housing 200 and the air outlet 220 is located at the front of the housing 200.

[0057] The evaporator 100 and the housing 200 are fixedly connected. In some embodiments, the base 110 includes a fixing plate 111 and a mounting plate 112. Fixing holes are formed in the fixing plate 111, and the mounting plate 112 is connected to the fixing plate 111 and arranged at an angle. The mounting plate 112 is used to connect with external components. The mounting plate 112 is perpendicular to the fixing plate 111 and is integrally formed.

[0058] In some embodiments, the evaporator 100 includes two heat exchange assemblies 101, each comprising a base 110, a plurality of heat exchange tubes, and a plurality of heat exchange fins 130. The two heat exchange assemblies 101 are arranged in a V-shape with their openings facing the air inlet 210. A fan 300 is located on the side of the evaporator 100 away from the air inlet 210. The included angle between the two heat exchange assemblies 101 is 30° to 50°.

[0059] A V-shaped groove is formed between the two heat exchange components 101. The evaporator 100 also includes two baffles 160, which are used to block the two ends of the V-shaped groove so that the airflow entering the area between the two heat exchange components 101 can only pass through the heat exchange components 101 and flow out of the evaporator 100.

[0060] To ensure that the refrigerant flow rate into the two heat exchange components 101 is the same, in some embodiments, the heat exchanger further includes a main inlet pipe 410 and two branch inlet pipes 420. The outlet of the main inlet pipe 410 is connected to the inlet of a three-way valve, the inlets of the two branch inlet pipes 420 are respectively connected to the two outlets of the three-way valve, and the outlets of the two branch inlet pipes 420 are respectively connected to the two liquid inlets in the two heat exchange components 101. This arrangement allows the refrigerant to be evenly divided into two paths, entering the two heat exchange components 101 respectively.

[0061] To facilitate the arrangement of pipelines, in some embodiments, the heat exchanger further includes a main outlet pipe 430 and two branch outlet pipes 440. The inlet of the main outlet pipe 430 is connected to the outlet of the three-way valve, the outlets of the two branch outlet pipes 440 are respectively connected to the two inlets of the three-way valve, and the inlets of the two branch outlet pipes 440 are respectively connected to the liquid outlets of the two heat exchange components 101.

[0062] During the production process, manufacturing and installation errors are inevitable, which can cause the centerline of the air inlet 210 to be misaligned with the symmetrical plane of the evaporator 100. This results in different flow rates of the airflow into the two heat exchange components 101 after entering the air inlet 210. Consequently, a larger amount of gas flows through one heat exchange component 101 and a smaller amount flows through the other. This can lead to the refrigerant in the heat exchange component 101 with the larger amount of gas being fully vaporized but unable to continue cooling the excess gas, while the refrigerant in the heat exchange component 101 with the smaller amount of gas cannot be effectively vaporized. To address this issue, in some embodiments, each heat exchange component 101 has at least two tube groups 140. The two heat exchange components 101 are defined as a first component and a second component, respectively. One through-tube 500 connects the liquid outlet of the first tube group 140 in the first component and the liquid inlet of the second tube group 140 in the second component, while another through-tube 500 connects the liquid outlet of the first tube group 140 in the second component and the liquid inlet of the second tube group 140 in the first component. This arrangement allows refrigerant from the same branch to enter the two heat exchange components 101 sequentially. If heat exchange is insufficient in one heat exchange component 101, sufficient heat exchange will occur in the other heat exchange component 101, avoiding uneven heat exchange caused by uneven airflow.

[0063] In some embodiments, the heat exchange assembly 101 has three tube groups 140, with the second and third tube groups 140 in the first assembly connected. The second and third tube groups 140 in the second assembly are also connected.

[0064] Furthermore, a siphon tube 600 connects the two intercalation tubes 500, and the inner diameter of the siphon tube 600 is smaller than that of the intercalation tubes 500. Specifically, the inner diameter of the siphon tube 600 is 1.5mm to 2.5mm. The siphon tube 600 is configured to adjust the refrigerant vaporization degree between the intercalation tubes 500 when they differ, allowing liquid refrigerant to flow from the intercalation tube 500 with a lower vaporization degree to the intercalation tube 500 with a higher vaporization degree. It should be noted that in embodiments with at least three tube groups 140, even with intercalation tubes 500, uneven airflow to the two heat exchange components 101 can still lead to different vaporization effects in the second and third tube groups 140 of different heat exchange components 101. For example, when the airflow to the first component is large, the degree of vaporization in the second and third pipe groups 140 of the first component is higher than that in the second and third pipe groups 140 of the second component, which causes the refrigerant in the siphon 600 to flow towards the first component.

[0065] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An evaporator, characterized by include: A base (110) having a mounting portion; Several heat exchange pipes (120) are used for circulating refrigerant; A plurality of heat exchange fins (130) are arranged at intervals along the extension direction of the heat exchange pipeline (120), and each heat exchange fin (130) is connected to each heat exchange pipeline (120). Several heat exchange pipes (120) form several pipe groups (140). Along the gas flow direction, the several pipe groups (140) are arranged at intervals and connected. Along the refrigerant flow direction, the inner diameter of the heat exchange pipes (120) in the several pipe groups (140) increases sequentially.

2. The evaporator of claim 1, wherein, The inner diameter of the heat exchange pipe (120) in the air inlet side pipe group (140) of the evaporator (100) is larger than the inner diameter of the heat exchange pipe (120) in the air outlet side pipe group (140) of the evaporator (100).

3. The evaporator of claim 2, wherein, The inner diameter of the heat exchange pipes (120) in the tube group (140) on the air outlet side of the evaporator (100) is 5mm~7mm; and / or, The inner diameter of the heat exchange pipe (120) in the pipe assembly (140) between the air outlet and air inlet sides of the evaporator (100) is 7mm~9mm; and / or, The inner diameter of the heat exchange pipe (120) in the air inlet side pipe group (140) of the evaporator (100) is 9mm~16mm.

4. The evaporator according to claim 2, characterized in that, When the dryness fraction X of the refrigerant in the heat exchange pipeline (120) is ≤0.4, the inner diameter of the heat exchange pipeline (120) is 5mm~7mm; when the dryness fraction X of the refrigerant in the heat exchange pipeline (120) is 0.4<X<0.8, the inner diameter of the heat exchange pipeline (120) is 7mm~9mm; when the dryness fraction X of the refrigerant in the heat exchange pipeline (120) is ≥0.8, the inner diameter of the heat exchange pipeline (120) is 9mm~16mm.

5. The evaporator according to claim 1, characterized in that, Several heat exchange pipes (120) form at least three rows of pipe groups (140), and the heat exchange pipes (120) in adjacent rows of pipe groups (140) are staggered along the gas flow direction.

6. The evaporator according to claim 1, characterized in that, The base (110) is provided with a fixing hole to form an installation part, and the heat exchange pipeline (120) passes through the fixing hole.

7. The evaporator according to claim 6, characterized in that, The evaporator (100) also includes a buffer gasket (150), which is sleeved on the outer periphery of the heat exchange pipeline (120) and passes through the fixing hole. The buffer gasket (150) is interference-fitted or bonded to the base (110).

8. The evaporator according to claim 6, characterized in that, The base (110) includes a fixing plate (111) and a mounting plate (112). The fixing hole is opened in the fixing plate (111). The mounting plate (112) is connected to the fixing plate (111) and arranged at an angle. The mounting plate (112) is used to connect with external components.

9. A kitchen air conditioner, comprising a housing (200), a fan (300), and an evaporator (100) as described in any one of claims 1-8, characterized in that, The housing (200) has an air inlet (210) and an air outlet (220). The fan (300) is located inside the housing (200), and the outlet of the fan (300) is connected to the air outlet (220). The evaporator (100) is located inside the housing (200) and between the air inlet (210) and the inlet of the fan (300).

10. The kitchen air conditioner according to claim 9, characterized in that, The air inlet (210) is located on the top of the housing (200), and the air outlet (220) is located on the front side of the housing (200).

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