Spiral baffle type refrigeration machine evaporator

Abstract

This invention relates to the field of baffle plate refrigeration technology, and more particularly to a spiral baffle plate refrigeration evaporator, comprising an evaporator body, with an inlet and an outlet fixedly provided on both sides of the upper end of the evaporator body, and a spiral baffle fixedly provided inside the evaporator body. The spiral baffle causes the refrigerant to form a continuous spiral flow inside the evaporator, resulting in a uniform flow channel, low flow resistance, more balanced cold distribution, high heat exchange efficiency, and a corresponding reduction in evaporator volume. The heat exchange tubes, conical pressure tubes, inserts, threaded sleeves, and multiple sealing rings form a multi-stage conical and annular surface seal, with a long sealing path, reliable sealing, no leakage during long-term operation, and significantly extended maintenance cycle. The ends of the heat exchange tubes are connected by threaded sleeves, allowing for complete removal or insertion by simply loosening the external bolts during disassembly and assembly, without the need for cutting or welding, greatly reducing the workload of inspection and replacement, and lowering maintenance costs.

Description

Technical Field

[0001] This invention relates to the field of baffle plate refrigerator technology, specifically to a spiral baffle plate refrigerator evaporator. Background Technology

[0002] Baffles are crucial components for improving heat exchanger efficiency. Spiral baffle heat exchangers utilize idealized spiral baffles, resulting in a continuous spiral baffle heat exchanger without a central tube, unlike discontinuous spiral baffle heat exchangers on the market. Spiral baffle heat exchangers offer advantages such as improved heat transfer efficiency, reduced shell-side resistance, improved vibration control, and reduced fouling.

[0003] The bow-shaped baffle shell-and-tube evaporator has the following structure: multiple bow-shaped (single, double, or triple) baffles are arranged in the shell side, causing the refrigerant to flow in a "Z" shape. Its drawbacks include: large dead zones, easy formation of stagnant areas leading to localized subcooling and lubricant buildup; gap leakage between the baffles and heat exchange tubes, reducing the actual heat transfer coefficient by 10% to 25%; significant vibration and noise caused by lateral scouring of the tube bundle; fatigue fracture of the heat exchange tubes during long-term operation; difficult cleaning; and the need for complete disassembly once scaling occurs.

[0004] Plate evaporators are constructed by brazing multiple corrugated plates, with refrigerant and coolant flowing alternately between the plates. Disadvantages include low pressure resistance (≤3.0 MPa), unsuitability for high-pressure refrigerants (such as R410A, R32, CO2), narrow flow channels, extremely high water quality requirements, susceptibility to clogging, and the brazing technique between plates making repair impossible after localized leaks, necessitating the scrapping of the entire unit.

[0005] Dry shell-and-tube evaporator • Structure: The refrigerant flows through the tubes, and evaporates after filling the shell side. Disadvantages: Large refrigerant charge, which does not conform to the environmental trend of low GWP and low charge; high requirements for liquid level control; too low a liquid level can easily cause overheating and reduce COP; too high a liquid level can easily cause liquid slugging; and oil return is difficult, requiring an additional ejector oil return device.

[0006] Although traditional spiral baffle evaporators have the concept of "continuous spiral baffles" to improve the dead zone problem in bow-shaped plate flow, existing designs still have the following issues:

[0007] The baffles are fixed to the inner wall of the shell and the outer wall of the heat exchange tubes by welding. Thermal expansion and contraction can easily cause thermal stress cracks. The heat exchange tubes are connected to the tube sheet by expansion joints or simple welding, resulting in poor sealing reliability and easy micro-leakage. Maintenance requires cutting the shell or damaging the tube sheet, resulting in long maintenance cycles and high costs. The fixed pitch of the baffles cannot adapt to the optimization requirements of flow resistance and heat transfer efficiency under different operating conditions.

[0008] With the widespread application of new refrigerants (R32, R1234yf, CO2), evaporators are subject to comprehensive requirements of "high pressure, low charge, easy maintenance, and high efficiency." Simultaneously, applications such as data centers and process cooling require chiller units to operate continuously year-round, necessitating rapid maintenance of the evaporator without interrupting system operation. Traditional structures can no longer simultaneously meet these demands, thus requiring a spiral baffle plate evaporator to address these issues. Summary of the Invention

[0009] The purpose of this invention is to provide a spiral baffle plate evaporator for a refrigeration unit to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention provides the following technical solution:

[0011] A spiral baffle evaporator for a refrigeration unit includes an evaporator body. An inlet and an outlet are fixedly provided on both sides of the upper end of the evaporator body. A spiral mounting baffle is fixedly provided inside the evaporator body. Several heat exchange tube mounting holes are provided inside the spiral mounting baffle, and heat exchange tubes are fitted inside the heat exchange tube mounting holes. Port mounting mechanisms are fixedly provided at both ends of the evaporator body. A sealing mechanism is fitted to the surface of the port mounting mechanism. A heat exchange interface is installed on the outside of the sealing mechanism, and a heat exchange port is fixedly provided on the surface of the heat exchange interface. A bolt mounting ring is fixedly provided at the edge of the evaporator body, and the bolt mounting ring, sealing mechanism, and heat exchange interface are fixed by bolts.

[0012] Furthermore, the port installation mechanism includes an evaporator end sealing plate, which is welded and fixed to both ends of the evaporator body, and the surface of the evaporator end sealing plate is provided with several second through holes.

[0013] Furthermore, the surface of the evaporator end sealing plate is provided with a heat exchange tube end sealing groove and an annular sealing groove corresponding to the second through hole.

[0014] Furthermore, the heat exchange tube end sealing groove is located inside the annular sealing groove, and the centers of the second through hole, the heat exchange tube end sealing groove, and the annular sealing groove are the same. A second sealing ring mounting groove is provided at the bottom of the inner side of the annular sealing groove, and a third sealing ring mounting groove is provided at the bottom of the inner side of the heat exchange tube end sealing groove.

[0015] Furthermore, the sealing mechanism includes a sealing plate, the edge of which is fixedly provided with a bolt mounting plate, the surface of which is provided with a plurality of bolt holes, and the sealing plate is fixed to bolts through the bolt holes on the surface of the bolt mounting plate.

[0016] Furthermore, the sealing plate has several first through holes on its surface, and a tapered pressure tube is provided at the lower end of the sealing plate corresponding to the first through holes, with an insert fixed at the lower end of the tapered pressure tube.

[0017] Furthermore, the tapered pressure tube is adapted to the tapered mounting head of the heat exchange tube, the outer diameter of the insert is the same as the inner diameter of the threaded sleeve, and the surface of the tapered pressure tube is provided with a first sealing ring mounting groove.

[0018] Furthermore, a plurality of sealing rings are fixedly provided on the lower surface of the sealing plate with the first through hole as the center, and the sealing rings are adapted to the annular sealing groove.

[0019] Furthermore, the heat exchange tube includes: a tube body, a plurality of heat exchange fins fixedly provided on the surface of the tube body, threaded sleeves threadedly connected to both ends of the tube body, and a heat exchange tube tapered mounting head fixedly provided at one end of the threaded sleeve.

[0020] Furthermore, the heat exchange tube tapered mounting head is provided with a tapered groove inside that is adapted to the tapered pressure tube, and a fourth sealing ring mounting groove is provided inside the tapered groove.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. The spiral baffle of this invention enables the refrigerant to form a continuous spiral flow inside the evaporator, resulting in a uniform flow channel, low flow resistance, more balanced cold energy distribution, and high heat exchange efficiency. The volume of the evaporator can be reduced accordingly. The heat exchange tube, conical pressure tube, insert, threaded sleeve, and multiple sealing rings form a multi-stage conical and annular surface seal with a long sealing path, reliable sealing, no leakage during long-term operation, and significantly extended maintenance cycle. The heat exchange tube ends are connected with threaded sleeves, and during disassembly and assembly, only the external bolts need to be loosened to pull out or insert the whole tube without cutting or welding. The workload of inspection and replacement is greatly reduced, and maintenance costs are reduced.

[0023] 2. In this invention, the sealing plate and the evaporator end sealing plate are pressed together in one step by bolt mounting plate and bolt mounting ring, resulting in uniform installation force, simple assembly process, short on-site construction time, and reduced manpower input. The heat exchange tube is provided with heat exchange fins on its outer wall, which increases the effective heat exchange area. At the same time, the fins generate secondary disturbance to the spiral flow, thinning the boundary layer and further improving the heat transfer coefficient. The multiple sealing rings are placed in independent installation grooves, which are accurately positioned and not easy to shift or twist. They still maintain elasticity under long-term alternating hot and cold conditions, and the sealing life is synchronized with the system life. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall internal three-dimensional structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the spiral mounting baffle structure of the present invention;

[0027] Figure 4This is a top-view perspective view of the sealing mechanism and port mounting mechanism of the present invention.

[0028] Figure 5 This is a top view of the sealing plate structure of the present invention;

[0029] Figure 6 This is a bottom view of the sealing plate structure of the present invention;

[0030] Figure 7 This is a partially enlarged structural diagram of the sealing plate of the present invention;

[0031] Figure 8 This is a schematic diagram of the evaporator end sealing plate structure of the present invention;

[0032] Figure 9 This is a partially enlarged structural diagram of the evaporator end sealing plate of the present invention;

[0033] Figure 10 This is a schematic diagram of the heat exchange tube structure of the present invention;

[0034] Figure 11 This is a bottom-view perspective view of the sealing mechanism and port mounting mechanism of the present invention.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Evaporator body; 2. Liquid inlet; 3. Liquid outlet; 4. Bolt; 5. Heat exchange port; 6. Heat exchange interface; 7. Bolt mounting ring; 8. Heat exchange tube; 9. Spiral mounting baffle; 10. Sealing mechanism; 11. Port mounting mechanism; 12. Bolt mounting plate; 13. Bolt hole; 14. Sealing plate; 15. First through hole; 16. Sealing pressure ring; 17. Conical pressure tube; 18. First sealing ring mounting groove; 19. Insert sleeve; 20. Evaporator end sealing plate; 21. Annular sealing groove; 22. Second sealing ring mounting groove; 23. Second through hole; 24. Third sealing ring mounting groove; 25. Heat exchange tube end sealing groove; 26. Heat exchange tube conical mounting head; 27. Threaded sleeve; 28. Tube body; 29. ​​Fourth sealing ring mounting groove; 30. Heat exchange fins; 31. Heat exchange tube mounting hole. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0038] To facilitate understanding of the present invention, a more complete description will be given below with reference to relevant descriptions. Several embodiments of the invention are provided. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] Please see Figure 1-11This invention provides a technical solution: a spiral baffle evaporator for a refrigerator, comprising an evaporator body 1. The evaporator body 1 provides a pressurized, sealed space for the entire heat exchange process, preventing refrigerant leakage and withstanding high and low pressure fluctuations in the system. An inlet 2 and an outlet 3 are fixedly provided on both sides of the upper end of the evaporator body 1. The inlet 2, located at the upper end, allows the liquid refrigerant to be evenly distributed by gravity. The outlet 3, located at the upper end, facilitates the smooth discharge of vaporized refrigerant, reducing droplet entrainment. A spiral mounting baffle 9 is fixedly provided inside the evaporator body 1. The spiral baffle forces the shell-side fluid to advance in a spiral, extending the heat exchange time and increasing turbulence intensity, significantly improving the overall heat transfer coefficient. The spiral mounting baffle 9 has several heat exchange tube mounting holes 31 inside. The mounting holes 31 serve as positioning references to ensure that all heat exchange tubes 8 are parallel and have consistent spacing, avoiding flow short circuits and vibration wear. Heat exchange tubes 8 are fitted inside the heat exchange tube mounting holes 31. The replaceable fitting structure allows individual heat exchange tubes to be independently installed and removed, shortening the time required for heat exchange. To reduce maintenance time and downtime losses, port mounting mechanisms 11 are fixed at both ends of the evaporator body 1. The port mounting mechanisms 11 isolate the shell-side space from the external pipeline, forming a primary static sealing surface to prevent refrigerant leakage. A sealing mechanism 10 is fitted to the surface of the port mounting mechanism 11. The fitted sealing mechanism 10 achieves secondary sealing through surface-to-surface pressing, forming a redundant barrier and improving system reliability. A heat exchange interface 6 is installed on the outside of the sealing mechanism 10. The heat exchange interface 6 serves as a transition section for the inlet and outlet of the tube-side fluid, reducing water hammer impact caused by sudden changes in flow velocity. A heat exchange port 5 is fixed to the surface of the heat exchange interface 6. The heat exchange port 5 adopts the form of a standard flange or welded short pipe, which facilitates quick connection with external pipelines. A bolt mounting ring 7 is fixed to the edge of the evaporator body 1. The bolt mounting ring 7, the sealing mechanism 10, and the heat exchange interface 6 are fixed by bolts 4. The circumferentially distributed bolts 4 provide uniform clamping force to ensure that each sealing surface maintains a constant specific pressure during temperature changes, thus avoiding leakage.

[0042] As an example of the present invention, the port installation mechanism 11 includes an evaporator end sealing plate 20. The evaporator end sealing plate 20 is welded and fixedly disposed at both ends of the evaporator body 1. The welding and fixing not only ensures that the end sealing plate is coaxial with the shell, but also eliminates the risk of gasket aging under high temperature and high pressure of traditional flanges. The surface of the evaporator end sealing plate 20 is provided with a plurality of second through holes 23. The second through holes 23 correspond one-to-one with the heat exchange tubes 8 to form a channel for the fluid in the tube side, and at the same time serve as tube end positioning holes to ensure assembly accuracy.

[0043] As an example of the present invention, the surface of the evaporator end sealing plate 20 is provided with a heat exchange tube end sealing groove 25 and an annular sealing groove 21 corresponding to the second through hole 23. The dual groove design separates the tube end seal from the end face seal, realizes graded pressure bearing, and reduces the risk of single-point failure.

[0044] As an example of the present invention, the heat exchange tube end sealing groove 25 is disposed inside the annular sealing groove 21, and the second through hole 23, the heat exchange tube end sealing groove 25 and the annular sealing groove 21 have the same center. The concentric structure ensures that the sealing ring is compressed evenly during assembly, avoiding the sealing failure caused by uneven load. The bottom of the inner side of the annular sealing groove 21 is provided with a second sealing ring mounting groove 22, and the bottom of the inner side of the heat exchange tube end sealing groove 25 is provided with a third sealing ring mounting groove 24. The bottom mounting groove can restrict the radial movement of the O-ring, maintain the correct compression ratio under high temperature and high pressure, and extend the sealing life.

[0045] As an example of the present invention, the sealing mechanism 10 includes: a sealing plate 14, a bolt mounting plate 12 fixedly provided on the edge of the sealing plate 14, a plurality of bolt holes 13 provided on the surface of the bolt mounting plate 12, the sealing plate 14 being fixed to the bolt 4 through the bolt holes 13 on the surface of the bolt mounting plate 12, the bolt mounting plate 12 forming a rigid force transmission frame, which uniformly transmits the bolt preload to the entire sealing surface to prevent local warping.

[0046] As an example of the present invention, the sealing plate 14 is provided with a plurality of first through holes 15 on its surface, and a tapered pressure tube 17 is provided at the lower end of the sealing plate 14 corresponding to the first through holes 15. The tapered conical surface of the tapered pressure tube 17 generates a wedge effect when pressed, and becomes tighter and tighter, thereby achieving a metal-to-metal self-tightening seal. A plug 19 is fixedly provided at the lower end of the tapered pressure tube 17. The plug 19 extends into the threaded sleeve 27 to form radial positioning and eliminate fretting wear caused by vibration.

[0047] As an example of the present invention, the tapered pressure tube 17 is adapted to the tapered mounting head 26 of the heat exchange tube. The tapered surface fit provides a line contact seal with high contact stress and a long sealing path, which significantly reduces the probability of micro-leakage. The outer diameter of the insert 19 is the same as the inner diameter of the threaded sleeve 27. The precision clearance fit forms a guide pair to ensure assembly concentricity and prevent the sealing ring from being sheared. The surface of the tapered pressure tube 17 is provided with a first sealing ring mounting groove 18. An O-ring is embedded in the mounting groove 18 as an elastic compensation element to absorb the difference in thermal expansion and contraction during temperature cycling and maintain a constant sealing pressure.

[0048] As an example of the present invention, a plurality of sealing rings 16 are fixedly provided on the lower surface of the sealing plate 14 with the first through hole 15 as the center. The sealing rings 16 are adapted to the annular sealing groove 21. After the sealing rings 16 are pressed into the annular sealing groove 21, a labyrinth + compression double sealing structure is formed. Even if the O-ring ages, it can still provide a secondary seal and improve the system safety.

[0049] As an example of the present invention, the heat exchange tube 8 includes: a tube body 28, on the surface of which a plurality of heat exchange fins 30 are fixedly provided. The fins 30 expand the secondary heat transfer area, thereby increasing the heat exchange capacity per unit length by more than 30%, while enhancing fluid turbulence and thinning the boundary layer. Threaded sleeves 27 are provided at both ends of the tube body 28. The threaded connection facilitates on-site length adjustment, compensates for manufacturing tolerances, and facilitates replacement of worn ends. A heat exchange tube conical mounting head 26 is fixed at one end of the threaded sleeve 27. The conical mounting head 26 and the conical pressure tube 17 form a reusable metal sealing pair that can be repeatedly disassembled and reassembled, maintaining sealing performance after multiple disassemblies and reassemblies.

[0050] As an example of the present invention, the heat exchange tube conical mounting head 26 is provided with a conical groove inside that is adapted to the conical pressure tube 17. The inner and outer conical surfaces cooperate to provide a self-centering function, automatically correcting the concentricity during assembly and avoiding manual adjustment. The conical groove is provided with a fourth sealing ring mounting groove 29. The O-ring embedded in the mounting groove 29 and the mounting groove 18 form a double soft seal, ensuring zero leakage even if there are micro-scratches on the metal conical surface.

[0051] Working principle: During use, liquid refrigerant enters the shell side through the liquid inlet 2 at the upper end of the evaporator body. Due to the continuous spiral channel formed by the spiral baffle 9 inside the shell, the refrigerant is forced to flow along the spiral path, forming a "rotating forward" flow pattern. This flow significantly prolongs the residence time of the refrigerant in the evaporator, generates strong secondary circulation, increases turbulence, and disrupts the boundary layer, thereby increasing the heat transfer coefficient. The continuous rotating flow reduces local dry spots and lowers the risk of scaling. Inside the spiral channel, the liquid refrigerant absorbs heat from the heat transfer fluid in the heat exchange tubes and gradually evaporates into a low-temperature, low-pressure gaseous refrigerant, which finally flows out from the liquid outlet 3, completing the evaporation process.

[0052] The refrigerant enters the heat exchange interface 6 through the heat exchange port 5 on one side, and enters the heat exchange tube 8 through the sealing mechanism 10. The two ends of the heat exchange tube 8 form a double seal of conical surface and insert tube with the conical pressure tube 17 on the sealing plate 14 through the threaded sleeve 27 and the conical mounting head 26 of the heat exchange tube. The conical pressure tube 17 is inserted into the conical groove to form a metal-metal hard seal. The O-rings placed in the first sealing ring mounting groove 18 and the fourth sealing ring mounting groove 29 provide elastic compensation to ensure no leakage under high pressure. When the insert tube 19 is installed, it will be inserted into the threaded sleeve 27, thereby inserting into the tube body 28, so that the heat exchange liquid in the tube body 28 can directly enter the insert tube 19 to prevent heat exchange liquid leakage. The insert tube 19 and the threaded sleeve 27 form a radial positioning to avoid sealing failure caused by vibration. The refrigerant flows in the heat exchange tube 8 and transfers heat to the shell-side refrigerant through the heat exchange fins 30 densely distributed on the surface of the tube body 28. After the temperature drops, it flows out from the heat exchange port on the other side to achieve the purpose of cooling.

[0053] The evaporator end sealing plate 20 and the sealing plate 14 are pressed together by bolts 4. The sealing pressure ring 16 is embedded in the annular sealing groove 21. The sealing ring in the compression groove is located in the second sealing ring mounting groove 22, forming a static seal on the end face. The heat exchange tube end sealing groove 25 cooperates with the tapered pressure tube 17 to form an independent seal at the tube end. Even if a heat exchange tube needs to be replaced, it will not affect other pipelines. When it is necessary to repair or replace the heat exchange tube, simply loosen the bolts 4, remove the heat exchange interface 6 and the sealing plate 14, and the single heat exchange tube 8 along with the threaded sleeve 27 can be pulled out as a whole, making maintenance convenient.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spiral baffle plate type evaporator for a refrigerator, comprising an evaporator body, characterized in that, The evaporator body has an inlet and an outlet fixedly installed on both sides of its upper end. A spiral mounting baffle is fixedly installed inside the evaporator body. The spiral mounting baffle has several heat exchange tube mounting holes inside. Heat exchange tubes are installed inside the heat exchange tube mounting holes. Port mounting mechanisms are fixedly installed at both ends of the evaporator body. A sealing mechanism is fitted to the surface of the port mounting mechanism. A heat exchange interface is installed on the outside of the sealing mechanism. A heat exchange port is fixedly installed on the surface of the heat exchange interface. A bolt mounting ring is fixedly installed on the edge of the evaporator body. The bolt mounting ring, the sealing mechanism, and the heat exchange interface are fixed by bolts.

2. The spiral baffle plate evaporator for a refrigerator according to claim 1, characterized in that, The port installation mechanism includes an evaporator end sealing plate, which is welded and fixed to both ends of the evaporator body. The surface of the evaporator end sealing plate is provided with several second through holes.

3. The spiral baffle plate evaporator for a refrigerator according to claim 2, characterized in that, The surface of the evaporator end sealing plate is provided with a heat exchange tube end sealing groove and an annular sealing groove corresponding to the second through hole.

4. The spiral baffle plate evaporator for a refrigerator according to claim 3, characterized in that, The heat exchange tube end sealing groove is located inside the annular sealing groove, and the centers of the second through hole, the heat exchange tube end sealing groove and the annular sealing groove are the same. A second sealing ring mounting groove is provided at the bottom of the inner side of the annular sealing groove, and a third sealing ring mounting groove is provided at the bottom of the inner side of the heat exchange tube end sealing groove.

5. The spiral baffle plate evaporator for a refrigerator according to claim 4, characterized in that, The sealing mechanism includes a sealing plate, and a bolt mounting plate is fixedly provided on the edge of the sealing plate. The bolt mounting plate has a plurality of bolt holes on its surface, and the sealing plate is fixed to the bolts through the bolt holes on the surface of the bolt mounting plate.

6. The spiral baffle plate evaporator for a refrigerator according to claim 5, characterized in that, The sealing plate has several first through holes on its surface, and a tapered pressure tube is provided at the lower end of the sealing plate corresponding to the first through holes. An insert is fixedly provided at the lower end of the tapered pressure tube.

7. The spiral baffle plate evaporator for a refrigerator according to claim 6, characterized in that, The tapered pressure tube is adapted to the tapered mounting head of the heat exchange tube. The outer diameter of the insert is the same as the inner diameter of the threaded sleeve, and the surface of the tapered pressure tube is provided with a first sealing ring mounting groove.

8. The spiral baffle plate evaporator for a refrigerator according to claim 7, characterized in that, The lower surface of the sealing plate is fixed with several sealing rings centered on the first through hole, and the sealing rings are adapted to the annular sealing groove.

9. The spiral baffle plate evaporator for a refrigerator according to claim 6, characterized in that, The heat exchange tube includes: a tube body, a plurality of heat exchange fins fixedly provided on the surface of the tube body, threaded sleeves threadedly connected to both ends of the tube body, and a tapered mounting head for the heat exchange tube fixedly provided at one end of the threaded sleeve.

10. The spiral baffle plate evaporator for a refrigerator according to claim 6, characterized in that, The heat exchange tube tapered mounting head has a tapered groove inside that matches the tapered pressure tube, and a fourth sealing ring mounting groove is provided inside the tapered groove.

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