Low-thermal-resistance cylindrical evaporator and processing technology thereof

Abstract

The invention relates to the technical field of evaporators, and discloses a low-thermal-resistance cylindrical evaporator which comprises an inner cylinder and a coaxial outer cylinder arranged outside the inner cylinder in a sleeving mode, the front faces and the rear faces of the inner cylinder and the outer cylinder are assembled in a sealed mode, and an inlet pipe and an outlet pipe are assembled at the two ends of an annular cavity in the middle of the inner cylinder and the two ends of an annular cavity in the middle of the outer cylinder in a communicating mode respectively. Clamping strips arranged in the axial direction are assembled in an annular cavity between the inner barrel and the outer barrel, each clamping strip is of an annular structure with an opening and is made of an elastic material, the clamping strips are assembled between the inner barrel and the outer barrel in a limiting and clamping mode, and the opening directions of the adjacent clamping strips are opposite. According to the evaporator, the clamping strip structures are assembled between the inner cylinder wall and the outer cylinder wall in parallel, so that refrigerant channels are formed between the clamping strips, bidirectional flowing of refrigerant fluid is achieved through the opening structures of the clamping strips, the flowing effect of the refrigerant fluid is good, heat resistance is small, and the machining technology is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of evaporators, in particular to a low thermal resistance cylindrical evaporator and a processing technology thereof. Background Art

[0002] As a crucial heat exchange device in refrigeration systems, the evaporator's core function is to facilitate the evaporation of the refrigerant and absorb heat. Depending on the application scenario, evaporators are designed in a variety of structural forms to suit varying cooling needs, including plate evaporators, suspended basket evaporators, and cylindrical evaporators. The cylindrical evaporator, with its unique cylindrical shape, offers significant advantages in specific applications. This evaporator is typically deployed where cooling of the exterior or interior surfaces is required. Cylindrical evaporators not only provide a large heat exchange area but also help optimize heat transfer efficiency, ensuring sufficient refrigerant evaporation and heat absorption. They are used in the cooling and concentration of foods such as juice and dairy products, as well as in refrigeration and air conditioning. The relatively simple structure of a cylindrical evaporator facilitates cleaning, inspection, and maintenance. Furthermore, because cylindrical evaporators are typically designed with modularity and scalability in mind, they can be flexibly configured and expanded as needed.

[0003] Existing cylindrical evaporators generally use an inner and outer cylinder wall structure, with a spiral copper tube or spiral strip installed between the inner and outer cylinder walls. When using a spiral tube structure between the inner and outer cylinder walls, the spiral copper tube wall thickness is at least 0.5mm, and the outer cylinder thickness is 1mm. The copper tube and outer cylinder are in line contact, with a very small contact area, requiring the addition of thermal paste. This requires heat conduction through the copper tube-thermal paste-stainless steel outer cylinder, resulting in a high thermal resistance. Moreover, this type of evaporator has many complex parts and a number of manufacturing steps, requiring processes such as bending the tube, expanding the clamping fixture, applying thermal paste, and fixing with clamps. This results in high production costs, high thermal resistance, and low cooling efficiency.

[0004] When using a spiral strip (or spiral vane) structure, such as the spiral outer steel cylinder and its processing for the patented ice cream machine evaporator disclosed in Publication No. CN104315759B, the patent utilizes the close contact between the inner and outer cylinder walls and the spiral vanes to form a spiral refrigerant channel. This channel is sealed on both sides of the cylindrical evaporator and connected to piping at the front and rear of the evaporator. During use, refrigerant enters the spiral channel through the piping and evaporates, achieving the cooling function. During assembly, to ensure that the spiral vanes fit within the inner cylinder, a gap exists between the spiral vanes and the inner cylinder. The refrigerant flows directly through this gap, eliminating the refrigerant's pre-circulation path, reducing the effective heat exchange area and resulting in poor cooling. Furthermore, the processing of spiral vane cylindrical evaporators is also complex, resulting in high production costs. Summary of the Invention

[0005] (1) Technical problems to be solved: In response to the shortcomings of the existing technology, the present invention provides a low thermal resistance cylindrical evaporator and its processing technology. By arranging a card strip structure in parallel between the inner and outer cylinder walls, a refrigerant channel is formed between the card strips. The opening structure of the card strips is utilized to realize the two-way flow of the refrigerant liquid, the refrigerant liquid flow effect is good, the thermal resistance is smaller, and the processing technology is simpler.

[0006] (2) Technical solution: In order to solve the above technical problems, the present invention provides the following technical solution: a low thermal resistance cylindrical evaporator, comprising an inner cylinder and a coaxial outer cylinder sleeved outside the inner cylinder, the front and back surfaces of the inner cylinder and the outer cylinder are sealed, and the two ends of the annular cavity between the inner cylinder and the outer cylinder are connected and equipped with an inlet pipe and an outlet pipe respectively; the annular cavity between the inner cylinder and the outer cylinder is equipped with a clamping strip arranged in the axial direction, the clamping strip is an annular structure with an opening, and is made of elastic material, the clamping strip is limited and clamped and assembled between the inner cylinder and the outer cylinder, and the opening directions of adjacent clamping strips are opposite.

[0007] Preferably, the diameter of the outlet pipe is larger than the diameter of the inlet pipe, and the internal cavity of the inner cylinder and the outer cylinder is divided into a front section, a middle section, and a rear section along the axial direction from the inlet end to the outlet end, wherein the distance between the two clips in the front section is greater than the distance between the two clips in the middle section and the distance between the two clips in the rear section.

[0008] Preferably, the inlet pipe and the outlet pipe are mounted on the inner wall of the inner cylinder; or mounted on the outer wall of the outer cylinder.

[0009] Preferably, twice the distance between adjacent card strips>the width of the card strip opening>the distance between adjacent card strips.

[0010] Preferably, the cross-section of the clip strip is circular or square.

[0011] Preferably, both sides of the inner tube and the outer tube are sealed and assembled by side plates respectively, and a penetrating installation middle tube is assembled in the middle of the side plates on both sides.

[0012] Preferably, the outer wall of the inner cylinder is processed with an annular outer groove arranged along the axial direction, the clamping strip is clamped and assembled in the outer groove, and the inner wall of the outer cylinder and the outer diameter of the clamping strip are interference fitted; the outer groove corresponds to the shape of the contact position of the clamping strip.

[0013] Preferably, an annular inner groove arranged along the axial direction is processed on the inner wall of the outer cylinder, the clamping strip is clamped and assembled in the inner groove, and the outer wall of the inner cylinder and the inner diameter of the clamping strip are interference fitted.

[0014] A low thermal resistance cylindrical evaporator processing technology includes the following processing steps: Step 1: Prepare the inner cylinder, outer cylinder and clamping strip of the parts; Step 2: insert the card strips into the outer card slots on the outer wall of the inner tube so that the opening directions of adjacent card strips are opposite; Step 3: Heat the outer cylinder and insert it onto the outside of the card strip; Step 4: Cool the outer cylinder so that the inner wall of the outer cylinder is wrapped around the outer ring of the clamping strip; Step 5: seal and weld the outer and inner cylinders together; Step 6: Check the air tightness after welding is completed.

[0015] Preferably, in step 1, the inlet pipe and the outlet pipe are integrally welded to the inner wall of the inner cylinder.

[0016] Preferably, in step 1, the inner tube and the outer tube are made of stainless steel, and the clip strip is made of a clip spring structure.

[0017] Preferably, in step 5, high-frequency welding is used for sealing welding of the two ends of the inner tube and the outer tube.

[0018] (III) Beneficial effects: Compared with the prior art, the present invention provides a low thermal resistance cylindrical evaporator and its processing technology, which has the following beneficial effects: 1. The low thermal resistance tubular evaporator uses axially arranged clips to separate the cavity between the inner and outer tubes into parallel annular unit cavities, and the adjacent unit cavities are connected through the openings of the clips. Since the opening directions of adjacent clips are opposite, the connecting openings of the middle unit cavity and the adjacent unit cavities on both sides are located on two sides symmetrical with respect to the center of the circle; the connecting openings at both ends of the same unit cavity are connected through two semicircular arc cavities; in this way, when the refrigerant enters from the inlet pipe and flows to the outlet pipe, it will pass through multiple parallel unit cavities. Since the refrigerant in the unit cavity directly contacts the heat exchange wall, the thermal resistance is lower. At the same time, a step-by-step evaporation process is carried out in each unit cavity, thereby ensuring the heat exchange efficiency of each unit cavity corresponding to the heat exchange wall. Since the inlet and outlet ends of each unit cavity can be connected through two semicircular channels, the refrigerant has higher passability, which greatly improves the evaporation efficiency.

[0019] 2. During the manufacture of this cylindrical evaporator, a separate elastic clip is used instead of an integrated spiral strip or coil. The clip can be directly clamped into the slot. During assembly, the outer cylinder can be directly expanded and inserted into the clip through a thermal expansion process, so that the clip is pressed tightly between the inner and outer cylinders, thus ensuring the seal between adjacent unit cavities in the inner and outer cylinders. This effectively prevents the formation of gaps between the clip and the inner and outer walls, ensuring that the refrigerant gradually passes through each unit cavity and maintains the cooling effect. This cylindrical evaporator has fewer overall design and processing parts, simpler processes, faster design, processing and production, and lower costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the low thermal resistance cylindrical evaporator of the present invention; Figure 2 This is a schematic diagram of the three-dimensional structure of the inner cylinder and the clamping strip assembled from the front in Example 1 of the present invention; Figure 3 This is a schematic diagram of the three-dimensional structure of the inner cylinder and the clamping strip assembled from the back in Example 1 of the present invention; Figure 4 This is a schematic structural diagram of the card strip in Example 1 of the present invention; Figure 5 Schematic diagram of the cross-sectional structure of the refrigerant flow direction in Example 1 of the present invention; Figure 6 This is a schematic diagram of the structure of the side panels assembled according to the present invention; Figure 7 Schematic diagram of the cross-section structure of the low thermal resistance cylindrical evaporator during interference fit in Example 2 of the present invention.

[0021] In the picture: 01. Inlet pipe; 02. Outlet pipe; 1. Inner tube, 11. Outer slot; 2. Outer tube, 21. Inner slot; 3. Clip strip; 4. Side panel, 41. Install middle tube, 42. Flange. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example 1: In Example 1 of the present invention, the overall structure and principle of the low thermal resistance cylindrical evaporator are similar to those of the patented ice cream machine evaporator of announcement number CN104315759B, except that it is mainly used in the scenario of external cylinder wall cooling. Figure 1As shown, a low thermal resistance cylindrical evaporator comprises an inner cylinder 1 and a coaxial outer cylinder 2 extending outside the inner cylinder 1. The inner and outer cylinders 1 and 2 are sealed together at the front and back surfaces. In specific implementations, for applications in the food, cold drink, or edible ice industries, the inner and outer cylinders 1 and 2 can be made of stainless steel. The annular cavity between the inner and outer cylinders 1 and 2 is connected at both ends by an inlet pipe 01 and an outlet pipe 02, respectively. These inlet and outlet pipes 01 and 02 can be copper tubes, facilitating welding and connection to the liquefaction portion of the system. In this embodiment, since the working surface is the outer wall of the outer cylinder 2, the inlet and outlet pipes 01 and 02 are respectively mounted on the inner wall of the inner cylinder 1, near the ends. When the inner cylinder serves as the working surface, the inlet and outlet pipes 01 and 02 can also be welded to the outer wall of the outer cylinder as needed. The above structure is similar to that of a traditional cylindrical evaporator and will not be described in detail here.

[0024] In this embodiment, the improved structure is as follows Figure 2 and Figure 3 As shown, the annular cavity between the inner tube 1 and the outer tube 2 is equipped with a clamping strip 3 arranged along the axial direction. The clamping strip 3 is an annular structure with an opening, as shown in FIG. Figure 4 As shown, the clamping strip 3 is made of an elastic material, specifically spring steel. In practice, the center of the clamping strip 3 is located on the axis of the inner and outer cylinders 1 and 2, and the plane of the clamping strip 3 is perpendicular to the axis of the inner and outer cylinders 1 and 2. The clamping strip 3 is fixedly mounted between the inner and outer cylinders 1 and 2, with adjacent clamping strips 3 opening in opposite directions.

[0025] like Figure 2 and Figure 3 As shown, the low thermal resistance cylindrical evaporator uses the axially arranged clips 3 to separate the cavity between the inner tube 1 and the outer tube 2 into parallel annular unit cavities. The adjacent unit cavities are connected through the openings of the clips 3. Since the opening directions of the adjacent clips 3 are opposite, the connecting ports of the middle unit cavity and the adjacent unit cavities on both sides are located on two sides symmetrical with respect to the center of the circle. The connecting ports at both ends of the same unit cavity are connected through two semicircular arc cavities. In this way, when the refrigerant enters from the inlet pipe 01 and flows to the outlet pipe 02, it will pass through multiple parallel unit cavities. The entire refrigerant flow process is as follows Figure 5As shown, the refrigerant enters through the inlet pipe 01 on the right side of the annular cavity of the inner cylinder 1 and the outer cylinder 2, and finally flows out from the outlet pipe 02 on the left side of the annular cavity of the inner cylinder 1 and the outer cylinder 2. The refrigerant completes the evaporation process in the unit cavities parallel to each other between the inner cylinder 1 and the outer cylinder 2. The refrigerant flows in opposite directions between each adjacent unit cavity and eventually passes through the entire cavity between the inner cylinder 1 and the outer cylinder 2. In this evaporator, since the refrigerant in the unit cavity directly contacts the heat exchange wall, the thermal resistance is lower. At the same time, a step-by-step evaporation process is carried out in each unit cavity, ensuring the heat exchange efficiency of each unit cavity corresponding to the heat exchange wall. Since the inlet and outlet ends of each unit cavity can be connected through two semicircular channels, the refrigerant has higher permeability, which greatly improves the evaporation efficiency.

[0026] The refrigerant needs to evaporate in the refrigerator by reducing the pressure. At the same time, the volume of the refrigerant in the evaporator increases after evaporation, which requires a larger cross-section. Figure 1 and Figure 2 As shown, the diameter of the outlet pipe 02 is larger than that of the inlet pipe 01, thus ensuring that the refrigerant can be smoothly discharged after its volume increases. At the same time, the internal cavity of the inner cylinder 1 and the outer cylinder 2 is divided into a front section, a middle section, and a rear section along the axial direction from the inlet end to the outlet end, wherein the distance between the two clips 3 in the front section is greater than the distance between the two clips 3 in the middle section, and the distance between the two clips 3 in the rear section. This step-by-step spacing design increases the cross-sectional area of ​​the flow cavity in the internal cavity of the inner cylinder 1 and the outer cylinder 2 from the refrigerant inlet end to the outlet end, thereby further dividing the evaporation process of the refrigerant in the evaporator into multiple gradual processes. This makes the entire evaporative cooling process more uniform, thereby greatly reducing the vibration and noise of the evaporator.

[0027] In this embodiment, the distance between the outer wall of the inner cylinder 1 and the inner wall of the outer cylinder 2 is constant. Therefore, when the refrigerant flows in the cavity between the inner cylinder 1 and the outer cylinder 2, the ratio of the width between adjacent clips 3 to the opening of the clips 3 is the ratio of the cross-sectional area of ​​the cavity in which the refrigerant flows. In this patent, after the refrigerant enters one end of the unit cavity, it will enter the next exit position through the arc-shaped cavities on both sides. Therefore, in the unit cavity, the flow cross-section of the refrigerant is twice the cross-sectional area of ​​the unit cavity. At this time, the distance between two adjacent clips 3 is greater than the width of the clip 3 opening, which can ensure that when the refrigerant passes through the clip 3 opening, a pressure difference will occur on both sides of the clip 3 opening, thereby promoting the evaporation of the refrigerant. The width of the clip 3 opening is greater than the distance between adjacent clips 3; this ensures that the refrigerant flows more smoothly through both sides of the clip 3 opening.

[0028] In specific design, the cross section of the clip strip 3 can be circular or square, and the square includes a rectangular shape. Figure 2 As shown, the cross-section of the clamping strip 3 is circular. In the specific design, the outer wall of the inner tube 1 is machined with an axially arranged annular external clamping groove 11. The clamping strip 3 is securely mounted within the external clamping groove 11. The cross-sectional profile of the external clamping groove 11 at the point of contact with the clamping strip 3 is a corresponding arc. That is, the radius of the clamping strip 3 is the same as the radius of the arc of the cross-sectional profile of the external clamping groove 11. This ensures that the inner ring of the clamping strip 3 is fully secured within the external clamping groove 11. If the cross-section of the clamping strip 3 is square, the cross-sectional profile of the external clamping groove 11 is also designed to be a square groove of corresponding dimensions. The inner wall of the outer tube 2 is interference-fitted with the outer diameter of the clamping strip 3. This allows the outer tube 2 to press against the outer wall of the clamping strip 3, achieving a seal. Simultaneously, the interference fit between the inner wall of the outer tube 2 and the outer diameter of the clamping strip 3 ensures that the inner diameter of the clamping strip 3 remains locked to the external clamping groove 11, thus completely isolating the unit cavities on both sides.

[0029] In the specific design, the clamping strip 3 can directly use a standard clamping spring structure, that is, the clamping strip 3 uses a ready-made external clamping spring, which refers to a standard clamping spring. Figure 4 The outer card slot 11 is used with Figure 4 In this way, the card strip 3 can be directly purchased as a standard part, which greatly reduces the design and processing costs. The use of standard sizes makes the overall processing of the product more convenient, the processing cost is lower, and the size matching is easier to ensure.

[0030] like Figure 1 and Figure 6 As shown, in this embodiment, the inner and outer cylinders 1 and 2 are sealed together by side panels 4. These circular side panels 4 completely seal the sides of the inner and outer cylinders 1 and 2. A through-hole mounting tube 41 is installed between the side panels 4 on both sides. This allows the shaft of a device using this evaporator structure to be installed through the mounting tube 41. A flange 42 is integrally formed on one side of the outer cylinder 2, allowing the evaporator to be secured via the flange 42, resulting in a stable structure and convenient use.

[0031] When specifically processing the low thermal resistance cylindrical evaporator, the processing technology includes the following processing steps: Step 1: According to the above structure, refer to Figure 1 、 Figure 2 and Figure 3 Prepare the parts of the evaporator, such as the inner tube 1, the outer tube 2, the clamping strip 3, etc., wherein the inlet pipe 01 and the outlet pipe 02 are integrally welded to the inner wall of the inner tube 1; Step 2: Insert the card strips 3 into the outer card slots 11 on the outer wall of the inner tube 1 so that the opening directions of adjacent card strips 3 are opposite. Figure 2 As shown; Step 3: After heating, the outer cylinder 2 is inserted into the outside of the clamping strip 3. During the specific processing, the inner wall of the outer cylinder 2 and the outer diameter of the clamping strip 3 are designed to have a dimensional tolerance of interference fit; Step 4: After the outer cylinder 2 is assembled relative to the inner cylinder 1 in the previous step, the outer cylinder 2 is cooled so that the inner wall of the outer cylinder 2 is interference-wrapped around the outer ring of the clamping strip 3; Step 5: seal-weld the outer tube 2 and the inner tube 1 after interference fit in the previous step, so that a spaced and sealed unit cavity is formed between the outer tube 2 and the inner tube 1. During the specific welding, the seal welding of the inner tube 1 and the outer tube 2 is carried out by high-frequency welding. High-frequency welding can directly heat the welding surfaces on the inner sides of the two metals, which is simple to implement, has a faster heating method, and can ensure the welding effect. Step 6: Introduce pressurized gas into the welded cylindrical evaporator through the inlet pipe 01 and the outlet pipe 02 to test the air tightness of the evaporator.

[0032] After the above steps are completed, the product can be used directly according to production needs, or stored in a dry place.

[0033] In conventional cylindrical evaporators using spiral strips, during manufacture, the spiral strips are an integral structure. To ensure that they can be inserted into the inner tube 1, a clearance fit is required between the spiral strips and the inner tube 1. Therefore, it is impossible to design a structure corresponding to the outer slot 11 in this patent. This easily leaves gaps after assembly, resulting in a low refrigerant heat exchange efficiency. In the embodiment of this patent, a separate elastic clip 3 is used instead of an integral spiral strip or spiral tube. The clip 3 can be directly clamped into the clip slot 11, avoiding the problem of the conventional spiral strip structure being unable to clamp into the inner tube.

[0034] During assembly, the outer cylinder 2 is expanded and then inserted directly onto the outer portion of the clamping strip 3 assembled with the inner cylinder 1 through a thermal expansion process. After cooling, the clamping strip 3 is pressed tightly between the inner and outer cylinders 1 and 2, ensuring a tight seal between adjacent unit cavities. This effectively prevents the formation of gaps between the clamping strip 3 and the inner and outer walls of the inner and outer cylinders 1 and 2, ensuring that the refrigerant flows gradually through each unit cavity and maintains the cooling effect. This cylindrical evaporator design reduces the number of parts and simplifies the process, resulting in faster design and production, and lower costs.

[0035] Example 2: In this example, Figure 7As shown, the low thermal resistance cylindrical evaporator is basically the same as Example 1, the main difference is that the inner wall of the outer cylinder 2 is processed with an annular inner groove 21 arranged along the axial direction; the clamping strip 3 adopts an external clamping spring structure, and the clamping strip 3 is elastically clamped outward and assembled in the inner groove 21, and the outer wall of the inner cylinder 1 and the inner diameter of the clamping strip 3 are interference fit. Specifically, in this embodiment, the inner diameter of the clamping strip 3 and the outer wall of the inner cylinder 1 adopt an interference size tolerance. During the specific processing, the outer cylinder 2 and the clamping strip 3 are heated together after assembly, and then as shown in the following Figure 7 In the direction indicated by the arrow, the outer cylinder 2 and the clamping strip 3 are integrally inserted into the outside of the inner cylinder 1; and then cooled to achieve interference fit between the outer wall of the inner cylinder 1 and the inner diameter of the clamping strip 3.

[0036] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low thermal resistance cylindrical evaporator, comprising an inner cylinder (1) and a coaxial outer cylinder (2) sleeved outside the inner cylinder (1), wherein the front and rear surfaces of the inner cylinder (1) and the outer cylinder (2) are sealed, and the two ends of the middle annular cavity of the inner cylinder (1) and the outer cylinder (2) are connected and equipped with an inlet pipe (01) and an outlet pipe (02) respectively; characterized in that: A clamping strip (3) arranged in the axial direction is installed in the annular cavity between the inner cylinder (1) and the outer cylinder (2). The clamping strip (3) is an annular structure with an opening and is made of elastic material. The clamping strip (3) is fixedly mounted between the inner cylinder (1) and the outer cylinder (2), and the opening directions of adjacent clamping strips (3) are opposite.

2. The low thermal resistance cylindrical evaporator according to claim 1, characterized in that: The diameter of the outlet pipe (02) is larger than the diameter of the inlet pipe (01), and the internal cavities of the inner tube (1) and the outer tube (2) are divided into a front section, a middle section, and a rear section along the axial direction from the inlet end to the outlet end, wherein the distance between the two clamping strips (3) in the front section is greater than the distance between the two clamping strips (3) in the middle section, and greater than the distance between the two clamping strips (3) in the rear section.

3. The low thermal resistance cylindrical evaporator according to claim 1, characterized in that: The inlet pipe (01) and the outlet pipe (02) are mounted on the inner wall of the inner cylinder (1); or mounted on the outer wall of the outer cylinder (2).

4. The low thermal resistance cylindrical evaporator according to claim 1, characterized in that: Twice the distance between adjacent card strips (3)>the width of the opening of the card strip (3)>the distance between adjacent card strips (3).

5. The low thermal resistance cylindrical evaporator according to claim 1, characterized in that: The cross section of the clip (3) is circular or square.

6. A low thermal resistance cylindrical evaporator according to any one of claims 1 to 5, characterized in that: The outer wall of the inner cylinder (1) is processed with an annular outer groove (11) arranged in the axial direction, and the clamping strip (3) is clamped and assembled in the outer groove (11). The inner wall of the outer cylinder (2) and the outer diameter of the clamping strip (3) are interference-fitted; the outer groove (11) corresponds to the outer shape of the contact position of the clamping strip (3).

7. A low thermal resistance cylindrical evaporator according to any one of claims 1 to 5, characterized in that: An annular inner groove (21) arranged along the axial direction is machined on the inner wall of the outer cylinder (2), the clamping strip (3) is clamped and assembled in the inner groove (21), and the outer wall of the inner cylinder (1) and the inner diameter of the clamping strip (3) are interference fitted.

8. A low thermal resistance cylindrical evaporator according to any one of claims 1 to 5, characterized in that: The inner tube (1) and the outer tube (2) are sealed and assembled on both sides through side plates (4), and a penetrating installation middle tube (41) is assembled in the middle of the side plates (4) on both sides.

9. The low thermal resistance cylindrical evaporator processing technology according to claim 6, characterized in that: The processing steps include: Step 1: Prepare the inner cylinder (1), outer cylinder (2), and clamping strip (3); Step 2, inserting the clamping strips (3) into the outer clamping grooves (11) on the outer wall of the inner tube (1) so that the opening directions of adjacent clamping strips (3) are opposite; Step 3, heating the outer cylinder (2) and inserting it onto the outside of the clamping strip (3); Step 4, cooling the outer cylinder (2) so that the inner wall of the outer cylinder (2) is wrapped around the outer ring of the clamping strip (3); Step 5, sealing and welding the two ends of the outer cylinder (3) and the inner cylinder (1); Step 6: Check the air tightness after welding is completed.

10. The low thermal resistance cylindrical evaporator processing technology according to claim 9, characterized in that: In step 1, the inlet pipe (01) and the outlet pipe (02) are integrally welded to the inner wall of the inner cylinder (1).

11. The low thermal resistance cylindrical evaporator processing technology according to claim 9, characterized in that: In step 1, the inner cylinder (1) and the outer cylinder (2) are made of stainless steel, and the clamping strip (3) is made of a clamping spring.

12. The low thermal resistance cylindrical evaporator processing technology according to claim 9, characterized in that: In step 5, high-frequency welding is used for sealing welding of the two ends of the inner tube (1) and the outer tube (2).

Images