Evaporator and snow melting machine

Abstract

The evaporator comprises an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder extend in the front-back direction, the outer cylinder is arranged outside the inner cylinder in a sleeved mode, a closed cooling cavity is formed between the inner cylinder and the outer cylinder, a flow guide mechanism is arranged in the cooling cavity, and the flow guide mechanism is arranged in the cooling cavity. The cooling cavity is divided into a plurality of cooling flow channels through the flow guide mechanisms, each cooling flow channel comprises a direct flow section extending in the front-back direction and a conduction section communicating every two adjacent direct flow sections, the conduction sections are located at the ends of the direct flow sections, and every two adjacent conduction sections are staggered in the front-back direction. The cooling cavity is divided into the cooling flow channels through the flow guide mechanism, and a cooling medium is in direct contact with the outer cylinder during working, so that the refrigeration effect of the evaporator is greatly improved; and the cooling flow channel moves back and forth in the axial direction of the outer cylinder, so that the surface contact area of the cooling medium and the outer cylinder is large, the heat exchange time is long, and the heat conduction efficiency is high.

Description

Technical Field

[0001] This utility model relates to an evaporator, particularly an evaporator for a snow melting machine. Background Technology

[0002] The evaporator is a crucial component in refrigeration equipment, functioning as a heat exchanger. Low-temperature condensate passes through the evaporator, exchanging heat with the surrounding air, absorbing heat through vaporization, and achieving a cooling effect. Most current refrigeration equipment (such as snow melting machines) typically uses an evaporator body and coils. The evaporator body comprises inner and outer shells, with the coils fitted onto the inner shell and in contact with the outer shell wall. Condensate flows through the coils, exchanging heat with the outside air via the coil walls and the outer shell wall of the evaporator body, thus achieving a cooling effect. However, this structure requires heat conduction through the coil walls and the outer shell wall of the evaporator body. Due to the multiple conduction media involved, the heat transfer efficiency is relatively low, and the overall structure is complex and costly. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an evaporator to solve one or more technical problems existing in the prior art, and at least provide a beneficial option or create conditions.

[0004] The solution to the technical problem of this utility model is: an evaporator, including an inner cylinder and an outer cylinder, the inner cylinder and the outer cylinder extending in a front-to-back direction, the outer cylinder being sleeved outside the inner cylinder, and a sealed cooling chamber being formed between the inner cylinder and the outer cylinder, the cooling chamber being provided with a flow guiding mechanism, the flow guiding mechanism dividing the cooling chamber into several cooling channels, the cooling channels including direct current sections extending in a front-to-back direction, and conductive sections connecting two adjacent direct current sections, the conductive sections being located at the ends of the direct current sections, and two adjacent conductive sections being staggered front-to-back.

[0005] The beneficial effects of this utility model are as follows: This utility model forms a cooling chamber by relatively sealing the inner cylinder and the outer cylinder, and then uses a flow guiding mechanism to separate the cooling chamber into cooling channels, so that when the evaporator is working, the cooling medium flows directly in the cooling channels. Since the cooling medium is in direct contact with the outer cylinder, the cooling effect of the evaporator is greatly improved. Moreover, the cooling channels move back and forth along the axial direction of the outer cylinder, which makes the surface contact area between the cooling medium and the outer cylinder large, and the heat exchange time long and the heat conduction efficiency high.

[0006] As a further improvement to the above technical solution, the flow guiding mechanism includes a flow guiding groove, which comprises a vertical edge and an elastic flange. The vertical edge is sealed to the outer wall of the inner cylinder, and the elastic flange is sealed to the inner wall of the outer cylinder. By adding a flow guiding groove in the cooling chamber to guide the cooling medium, the cooling effect of the evaporator can be improved. Furthermore, the sealed contact between the elastic flange and the inner wall of the outer cylinder can improve the processing efficiency of the evaporator and reduce its production cost.

[0007] As a further improvement to the above technical solution, the flow guide channel also includes a bottom edge, and two vertical edges, which are respectively disposed on the left and right sides of the bottom edge. There are also two elastic flanges, which are located on the upper side of the vertical edges and are inclined to the vertical edges. The cross-section of the flow guide channel is shaped like a "︺", thereby improving the flow guiding effect and sealing effect.

[0008] As a further improvement to the above technical solution, the bottom edge, vertical edge, and elastic flange are integrally formed, and the guide channel is formed by bending an elastic steel sheet. The integrally formed guide channel can reduce production costs and improve production efficiency. Moreover, after being formed by bending the elastic steel cylinder, the elastic flange can abut more tightly against the inner wall of the outer cylinder, resulting in a better sealing effect.

[0009] As a further improvement to the above technical solution, a pressure strip is also included, which presses against the bottom edge. By adding a pressure strip to the bottom edge, the bottom edge is pressed tightly against the outer wall of the inner cylinder, making the installation of the guide channel more secure and reliable, while also improving the sealing effect between the bottom edge and the outer wall of the inner cylinder.

[0010] As a further improvement to the above technical solution, a notch is provided at the front or rear end of the guide channel, and the notch forms the conduction section. The notch allows the cooling medium to communicate between the two guide channels, facilitating processing.

[0011] As a further improvement to the above technical solution, the flow guiding mechanism includes several partition bars. The upper end of each partition bar abuts against the outer cylinder, and the lower end of each partition bar abuts against the inner cylinder. The partition bars extend along the front-to-back direction, and two adjacent partition bars are staggered in front-to-back arrangement. The partition bars divide the cooling cavity into cooling channels, making processing more convenient.

[0012] As a further improvement to the above technical solution, a sealing strip is also provided between the upper end of the separator and the inner wall of the outer cylinder. By adding the sealing strip, the processing efficiency of the flow guiding mechanism can be improved and the production cost can be reduced.

[0013] As a further improvement to the above technical solution, a sealing plate is provided at the front end of the inner cylinder. The sealing plate is sealed to the cooling cavity. An inlet pipe and an outlet pipe are provided on the sealing plate, both communicating with the cooling cavity. The inlet pipe and outlet pipe are arranged adjacent to each other. By using the sealing plate to enclose the front ends of the inner and outer cylinders, and simultaneously placing the inlet and outlet pipes on the sealing plate, manufacturing is simplified. Furthermore, because the inlet and outlet pipes are arranged adjacent to each other, the cooling medium enters through the inlet pipe and flows out through the outlet pipe, essentially flowing throughout the entire cooling channel. This results in a larger contact area between the cooling medium and the outer cylinder, leading to better cooling performance.

[0014] Furthermore, this invention also improves a snow melting machine, which includes the evaporator described above. Using the evaporator described above, the cooling effect of the snow melting machine can be improved. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly explained below. Obviously, the described drawings are only a part of the embodiments of this utility model, and not all of them. Those skilled in the art can obtain other design schemes and drawings based on these drawings without creative effort.

[0016] Figure 1 This is a three-dimensional schematic diagram of the evaporator of this utility model;

[0017] Figure 2 This is another three-dimensional schematic diagram of the evaporator of this utility model;

[0018] Figure 3 This is an exploded view of one embodiment of the evaporator of this utility model;

[0019] Figure 4 This is a three-dimensional schematic diagram of one type of flow guiding mechanism of the evaporator of this utility model;

[0020] Figure 5 This is a front view of one type of flow guiding mechanism of the evaporator of this utility model;

[0021] Figure 6 This is a side view of one type of flow guiding mechanism of the evaporator of this utility model;

[0022] Figure 7 This is an exploded view of another embodiment of the evaporator of this utility model;

[0023] Figure 8 This is an exploded view of another embodiment of the evaporator of this utility model.

[0024] Figure label:

[0025] Outer cylinder 100, inner cylinder 200, sealing plate 210, liquid inlet pipe 220, liquid outlet pipe 230, cooling chamber 300, cooling flow channel 310, direct flow section 311, conductive section 312, flow guiding mechanism 400, flow guiding groove 500, bottom edge 510, vertical edge 520, elastic flange 530, notch 540, pressure strip 550, partition strip 600, base 610. Detailed Implementation

[0026] The following will clearly and completely describe the concept, specific structure, and technical effects of this utility model in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are all within the protection scope of this utility model. Preferred embodiments of this utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, enabling a person to intuitively and vividly understand each technical feature and overall technical solution of this utility model, but they should not be construed as limiting the protection scope of this utility model.

[0027] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0028] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution. Furthermore, the various technical features in this invention can be combined interactively without contradicting each other.

[0030] A slush machine is a piece of equipment used to turn various fruit juices into a refreshing, slushy beverage. It mainly consists of a material tank, an evaporator, and a stirrer. The evaporator, as part of the slush machine's refrigeration system, is located inside the material tank and is used to cool the materials within. The stirrer mixes the materials and discharges them via either the stirrer or a discharge system when needed. Currently, the stirrers used in slush machines are primarily spiral-tube evaporators, which use spiral copper tubes wound inside a refrigeration cylinder. During operation, the low-temperature, low-pressure refrigerant exchanges heat with the refrigeration cylinder through the spiral copper tubes, and then with the materials in the material tank through the refrigeration cylinder. Its drawback is that the spiral copper tubes do not directly exchange heat with the materials in the material tank; instead, they first exchange heat with the cylinder wall. This is limited by the contact area between the spiral copper tubes and the cylinder wall, as well as the thickness of the spiral copper tubes, resulting in slow cooling speed, low cooling efficiency, and high manufacturing costs.

[0031] To overcome the shortcomings of existing technologies, this invention provides an improved evaporator. It forms a sealed cooling chamber between the inner and outer cylinders of the evaporator, and then adds a flow guiding mechanism within the cooling chamber. This allows the refrigerant to flow along the flow guiding mechanism within the cooling chamber. Because the refrigerant is in direct contact with the outer cylinder of the evaporator, the evaporator's cooling efficiency is greatly improved. Furthermore, by optimizing the flow guiding mechanism, the manufacturing cost of the evaporator is reduced.

[0032] Specifically, Example 1:

[0033] See Figures 1-6In this embodiment, the evaporator includes an outer cylinder 100 and an inner cylinder 200, both of which are cylindrical. The inner diameter of the outer cylinder 100 is larger than the outer diameter of the inner cylinder 200, and the inner cylinder 200 is concentrically fitted inside the outer cylinder 100. The axes of the inner cylinder 200 and the outer cylinder 100 extend along the front-rear direction. A relatively sealed cooling chamber 300 is formed between the inner wall of the outer cylinder 100 and the outer wall of the inner cylinder, and a flow guiding mechanism 400 is provided in the cooling chamber 300. The flow guiding mechanism 400 divides the cooling chamber 300 into S-shaped cooling channels 310 that meander along the front-rear direction. The cooling channel 310 includes a direct current section 311 extending along the front-rear direction and a connecting section 312 located at the end of the direct current section 311. The connecting section 312 connects two adjacent direct current sections 311, thereby allowing the refrigerant to flow from one direct current section 311 to the next. During operation, the refrigerant enters one of the cooling channels 310 from the front end of the evaporator, then flows from front to back along the direct flow section 311 of the cooling channel 310. Upon reaching the end, it flows through the connecting section 312 into the next cooling channel 310. The refrigerant then flows from back to front along the direct flow section 311 until it reaches the connecting section 312, after which it flows from front to back again. This cycle repeats, with the refrigerant flowing back and forth along multiple cooling channels 310 until it exits from the outlet at the front end of the evaporator. At this point, the refrigerant essentially completely covers all the inner walls of the outer cylinder 100. Because the refrigerant is in direct contact with the inner walls of the outer cylinder 100, the heat exchange effect of the evaporator is excellent, and the cooling effect is greatly improved. Furthermore, since the cooling channels 310 move back and forth in the front-to-back direction, the refrigerant flow is stable, the surface contact area between the refrigerant and the inner wall of the outer cylinder is large, and the contact time is long, resulting in more thorough heat exchange and thus improving the cooling effect of the evaporator.

[0034] In addition, the guide mechanism 400 arranged along the front and rear directions can also make the processing and production of the evaporator simpler and reduce manufacturing costs.

[0035] See Figures 3-6 The flow guiding mechanism 400 consists of multiple flow guiding channels 500, which are distributed in a ring on the outer wall of the inner cylinder 200. In this embodiment, the flow guiding channels 500 are formed by bending elastic steel sheets. Specifically, the flow guiding channel 500 includes a bottom edge 510, a vertical edge 520, and an elastic flange 530. Notches 540 are provided at the front or rear end of the flow guiding channel 500. The vertical edge 520 is located on the left and right sides of the bottom edge 510 and extends in the vertical direction. The bottom of the vertical edge 520 is connected to the bottom edge 510. The bottom of the elastic flange 530 is connected to the top of the vertical edge 520, and the top of the elastic flange 530 freely tilts outward on the vertical edge 520. The elastic flange 530 has an upward bending elastic tendency.

[0036] During evaporator installation, firstly, several guide channels 500 are systematically fixed onto the inner cylinder 200. During fixing, the bottom edge 510 is directly fixed to the outer wall of the inner cylinder 200. Fixing methods can include welding, bonding, or adding a pressure strip 550 to the bottom edge 510. The pressure strip 550 is then used to fix the guide channels 500 within the cooling chamber 300 through its connection with the inner cylinder 200. Next, the outer cylinder 100 is fitted over the inner cylinder 200 and the guide channels 500. Due to the elasticity of the flexible flange 530, when the outer cylinder 100 is fully fitted, the top of the flexible flange 530 directly abuts against the inner wall of the outer cylinder 100. Because of the good elasticity of the flexible flange 530, a reliable seal can be formed between the flexible flange 530 and the inner wall of the outer cylinder 100. Since the refrigerant pressure is not high during operation, the elasticity of the elastic flange 530 itself is sufficient to form a reliable seal between the elastic flange 530 and the inner wall of the outer cylinder, thus meeting the operational requirements.

[0037] Through the above structure, the cooling chamber 300 is divided into multiple relatively independent cooling channels 310 extending in the front-to-back direction by utilizing the guide channel 500 and the inner wall of the outer cylinder 100. After entering the cooling chamber, the refrigerant can flow between different guide channels 500 through the notch 540 on the guide channel 500. This allows the refrigerant to move back and forth in the cooling chamber 300 along an S-shaped trajectory during operation, so that the refrigerant can almost completely cover the inner wall of the outer cylinder, directly cooling the entire outer cylinder 100. Since the outer cylinder 100 is placed directly in the material cylinder and in direct contact with the material when the snow melting machine is working, the cooling effect of the snow melting machine can be improved.

[0038] As a further preferred embodiment, to make the seal between the elastic flange 530 and the outer cylinder 100 more reliable, the outer cylinder 100 can be provided with a sealing groove. When the elastic flange 530 is installed in place, the top of the elastic flange 530 is embedded in the sealing groove, thereby improving the sealing effect. During processing, several sealing grooves only need to be machined on the inner wall of the outer cylinder 100 using a milling cutter. The depth of the sealing groove does not need to be very large, just enough to allow the elastic flange 530 to be embedded. Moreover, in addition to its sealing function, the sealing groove can also serve to fix the installation. When fitting the outer cylinder 100, the elastic flange 530 can first be made to abut against other parts of the inner wall of the outer cylinder 100, and then, after being fully fitted, the outer cylinder 100 can be rotated so that all the elastic flanges 530 are embedded in the sealing grooves one by one.

[0039] In the above embodiments, the guide channel 500 is frame-shaped, and a cooling channel is formed between the bottom edge and the vertical edge of the guide channel 500. In other embodiments, the bottom edge may not be provided. For example, the bottom of the vertical edge is directly welded to the outer wall of the inner cylinder 200, and the outer wall of the inner cylinder 200, the inner wall of the outer cylinder 100, the two vertical edges, and the elastic flange are used to form a closed cooling channel.

[0040] Alternatively, in some other embodiments, the guide groove can be manufactured by assembly. For example, the material of the bottom edge and the vertical edge is different from that of the elastic flange. During production, the bottom edge and the vertical edge are processed first, and then the resilient elastic flange is snapped into the bottom edge.

[0041] In addition to the embodiments described above, the flow guiding mechanism 400 can also be in the following forms:

[0042] Example 2: See Figure 7 In this embodiment, the evaporator may include the same inner cylinder 200 and outer cylinder 100 structure, the main difference from Embodiment 1 is the structure of the flow guiding mechanism 400. The flow guiding mechanism 400 includes a plurality of partition bars 600, the upper end of the partition bar 600 abuts against the outer cylinder 100, and the lower end of the partition bar 600 abuts against the inner cylinder 200; the partition bars 600 extend in the front-to-back direction, and two adjacent partition bars 600 are staggered in front-to-back arrangement.

[0043] The partition strip 600 is generally square in shape. The thickness of the partition strip 600 is slightly less than the thickness of the cooling cavity 300, and the length of the partition strip 600 is slightly less than the length of the inner cylinder 200. The flow guiding mechanism 400 may further include two annular bases 610, which are fixed to the front and rear ends of the inner cylinder 200. One end of the partition strip 600 is fixed to one of the bases 610, while the other end of the partition strip 600 is separated from the other base 610. Adjacent partition strips 600 are staggered and fixed to the front and rear bases 610 respectively.

[0044] It is understood that the height of the base 610 is basically the same as the height of the divider 600. The base 610 can be integrally formed with the divider 600, or the divider 600 can be fixed to the base 610 by installation.

[0045] In this embodiment, multiple independent and interconnected cooling channels 310 are formed by utilizing the inner wall of the outer cylinder 100, the outer wall of the inner cylinder 200, the side walls of the two partition bars 600, and the end face of the base 610. During operation, the refrigerant enters the cooling channel 310 through the front base 610, and then flows from front to back in a straight line under the clamping of the two partition bars 600. When the refrigerant reaches the rear base 610, due to the gap between the partition bar 600 and the base 610 (equivalent to the conductive section 312), the refrigerant flows through the gap into the next cooling channel 310, and then flows from back to front in the cooling channel 310 until it hits the front base 610, then turns again and continues to flow from front to back... This cycle repeats until the refrigerant flows through all the cooling channels 310 and flows out from the outlet on the front base 610.

[0046] In this embodiment, the refrigerant directly contacts the outer cylinder 100, and the evaporator's cooling effect is ideal. However, because the partition strip 600 has a certain width, and its upper end directly abuts against the inner wall of the outer cylinder 100, the refrigerant does not directly contact the outer cylinder 100 at the position corresponding to the partition strip 600. However, since the partition strip 600 is also made of a material with good thermal conductivity, the heat from the outer cylinder 100 can be transferred to the refrigerant through the partition strip 600. Furthermore, by optimizing the width of the partition strip 600 and designing a reasonable width, the partition strip 600 can be securely installed in the cooling cavity 300 while also achieving ideal thermal conductivity.

[0047] In this embodiment, during production, the inner cylinder 200 is first bent and rolled out. Then, multiple straight dividing strips 600 are welded to the outside of the inner cylinder 200, and annular bases 610 are welded to both the front and rear ends of the inner cylinder 200, ensuring a reliable airtight connection between the dividing strips 600 and the inner cylinder 200, and between the dividing strips 600 and the bases 610. In this embodiment, the bases 610 and dividing strips 600 can also be made as a single unit, and then fixed to the outside of the inner cylinder 200. Alternatively, the inner cylinder 200, dividing strips 600, and bases 610 can be integrally formed; during production, a thicker inner cylinder blank is first machined, and then the required cooling channels 310 are milled on the surface of the inner cylinder blank. Compared to separate welding, integral forming provides a better sealing effect, but the production cost is higher.

[0048] As a further preferred embodiment, a sealing strip (not shown in the figure) is also provided between the upper end of the partition strip 600 and the inner wall of the outer cylinder 100. Since the partition strip 600 has a certain width, by providing a double-sided adhesive sealing strip on the partition strip 600, the partition strip 600 and the outer cylinder 100 are firmly adhered together. In the prior art, there are suitable sealing strips that can maintain good adhesion and sealing performance even at low temperatures.

[0049] As a further preferred embodiment, the inner cylinder 200 is provided with a sealing plate 210 at its front end. The sealing plate 210 is sealed to the cooling chamber 300. The sealing plate 210 is provided with an inlet pipe 220 and an outlet pipe 230, both of which are connected to the cooling chamber 300. The inlet pipe 220 and the outlet pipe 230 are arranged adjacent to each other. When the evaporator is working, the refrigerant needs to flow continuously in the cooling chamber. The refrigerant in the cooling chamber 300 is connected to the compressor through the inlet pipe 220 and the outlet pipe 230 at the front end of the evaporator. Arranging the inlet pipe 220 and the outlet pipe 230 adjacent to each other makes the evaporator structure more compact and easier to install. In order to ensure that the refrigerant can flow continuously along the cooling channel 310 in the cooling chamber 300, it can be understood that a partition strip is provided between the liquid inlet pipe 220 and the liquid outlet pipe 230 in the cooling chamber. This ensures that the refrigerant entering from the liquid inlet pipe 220 can flow unidirectionally along the cooling channel 310 and finally flow out from the liquid outlet pipe 230.

[0050] While both Embodiment 1 and Embodiment 2 provide an evaporator with good cooling performance, the manufacturing process requires fixing multiple guide channels or partitions to the surface of the outer cylinder, making the process complex. Although Embodiment 2 allows for integral molding, it requires a very thick inner cylinder blank, resulting in high production costs.

[0051] See Figure 8 In Example 3, this example provides an improved solution to address the processing and production problems in the above two examples.

[0052] In this embodiment, the inner cylinder 200 and the flow guiding mechanism 400 are integrally formed. During production, the flow guiding mechanism 400 can be stamped on a sheet metal piece, forming multiple cooling channels 310 as required, with a separator 600 between adjacent cooling channels 310; then, the stamped sheet metal is bent into the inner cylinder 200 through a bending process, and finally, the inner cylinder 200 is formed by welding. Alternatively, during production, a flat sheet metal piece is first bent into a cylinder to form an inner cylinder blank, and then the cooling channels 310 are stamped on the surface of the inner cylinder blank; finally, two through holes are drilled in two adjacent cooling channels 310, and the liquid inlet pipe 220 and the liquid outlet pipe 230 are fixed to the two through holes.

[0053] In this embodiment, since the inner cylinder 200 and the flow guiding mechanism 400 are integrally formed by stamping, not only is the sealing effect of the cooling channel 310 guaranteed, but the processing is also more convenient, the processing efficiency is higher, and the production cost is lower.

[0054] Meanwhile, this utility model also provides a snow melting machine, which includes the evaporator as described above. The snow melting machine of this utility model has a common snow melting machine structure in the prior art. By using the improved evaporator in this utility model, the cooling effect of the snow melting machine is improved.

[0055] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An evaporator, characterized in that: The device includes an inner cylinder and an outer cylinder, which extend in a front-to-back direction. The outer cylinder is fitted over the inner cylinder, and a sealed cooling chamber is formed between the inner and outer cylinders. The cooling chamber is provided with a flow guiding mechanism, which divides the cooling chamber into several cooling channels. Each cooling channel includes a direct current section extending in a front-to-back direction and a connecting section connecting two adjacent direct current sections. The connecting section is located at the end of the direct current section, and two adjacent connecting sections are staggered front-to-back.

2. The evaporator according to claim 1, characterized in that: The flow guiding mechanism includes a flow guiding groove, which includes a vertical edge and an elastic flange. The vertical edge is sealed to the outer wall of the inner cylinder, and the elastic flange is sealed to the inner wall of the outer cylinder.

3. The evaporator according to claim 2, characterized in that: The guide channel also includes a bottom edge, and there are two vertical edges, which are respectively arranged on the left and right sides of the bottom edge. There are also two elastic flanges, which are located on the upper side of the vertical edges and are inclined to the vertical edges.

4. The evaporator according to claim 3, characterized in that: The bottom edge, vertical edge, and elastic flange are integrally formed, and the guide groove is formed by bending an elastic steel sheet.

5. The evaporator according to claim 3, characterized in that: It also includes a pressure strip, which is pressed onto the bottom edge.

6. The evaporator according to claim 3, characterized in that: The guide channel has a notch at its front or rear end, and the notch forms the guide section.

7. The evaporator according to claim 1, characterized in that: The flow guiding mechanism includes several partition bars, the upper end of which abuts against the outer cylinder and the lower end of which abuts against the inner cylinder; the partition bars extend in the front-to-back direction and are staggered in front-to-back arrangement between two adjacent partition bars.

8. The evaporator according to claim 7, characterized in that: A sealing strip is also provided between the upper end of the separator and the inner wall of the outer cylinder.

9. The evaporator according to claim 1, characterized in that: The inner cylinder and the flow guiding mechanism are integrally formed.

10. A snow melting machine, characterized in that: Includes the evaporator as described in any one of claims 1-9 above.

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