Lightweight and efficient screw evaporator

Abstract

The present invention relates to the technical field of condenser tubes, and discloses a lightweight and efficient screw evaporator, comprising a base, a condenser tube and a screw. The base is arranged in an ice maker, and the base and the screw are connected by a shaft seat. The screw is vertically arranged on the base, the condenser tube and the screw are coaxially arranged, and the screw is inside the condenser tube. A knife cover is arranged on the top of the condenser tube, and a water inlet is arranged on the bottom of the outer side of the condenser tube. The outer edge of the screw thread contacts the inner wall of the condenser tube. A condensation cavity is arranged on the outer side of the condenser tube, and the condensation cavity is an annular cavity as a whole, and at least three annular heat-conducting rings are arranged inside. A refrigerant inlet and a refrigerant outlet are arranged on the outer side of the screw, and the refrigerant inlet is arranged above the refrigerant outlet. A screw capsule is arranged at the root of the screw thread, and the interior of the screw capsule is filled with easily condensable liquid. A condenser tube airbag is arranged at the bottom of the condenser tube, and the condenser tube airbag is filled with volatile liquid.

Description

Technical Field

[0001] The invention relates to the technical field of condenser tubes, in particular to a lightweight and efficient screw evaporator. Background Art

[0002] Ice makers, as a refrigeration mechanical equipment that generates ice by cooling water through an evaporator with a refrigerant in a refrigeration system, play an important role in daily life and industrial production. According to the different ice-making methods, ice makers are mainly divided into ice-type ice makers, bullet-type ice makers and extruded ice ice makers. Among them, extruded ice ice makers are popular for their continuous and efficient ice-making capabilities. The working principle of extruded ice ice makers is usually to squeeze out the ice after cooling and condensation in the ice-making cylinder from the ice outlet at the upper end through a continuous spiral extrusion structure to form ice cubes. This ice-making method is not only continuous and stable, but also can produce ice cubes with regular shapes and high quality. However, the existing extruded ice ice makers still have some shortcomings in design and function.

[0003] In the squeeze ice ice machine, the screw evaporator is a key component, and its performance directly affects the overall efficiency and lightweight of the ice machine. However, the existing screw evaporator still has some obvious defects in ice making efficiency and lightweight. In terms of ice making efficiency, although the screw evaporator achieves uniform distribution and efficient evaporation of water through a continuous spiral structure, in actual application, due to factors such as friction between the screw and the barrel, limitation of heat conduction efficiency and circulation speed of the refrigerant, the ice making speed is slow and the quality of ice cubes is unstable, which not only affects the production efficiency of the ice machine, but also increases energy consumption and operating costs. In terms of lightweight, the existing screw evaporator is usually made of heavy materials such as metal, resulting in a large overall weight, which not only increases the difficulty of transportation and installation of the equipment, but also limits the development of the ice machine in the direction of lightweight and miniaturization. With the advancement of science and technology and the diversification of consumer demand, lightweight and miniaturized ice machines are increasingly favored by the market. Therefore, how to achieve the lightweight design of the screw evaporator while ensuring ice making efficiency has become an important direction for the current development of ice machine technology. Summary of the invention

[0004] (I) Technical problems to be solved: In view of the deficiencies of the prior art, the present invention provides a lightweight and efficient screw evaporator, which has the advantage of efficient condensation and solves the problem of low condensation efficiency of the evaporator.

[0005] (II) Technical solution: To achieve the above-mentioned purpose of efficient condensation, the present invention provides the following technical solution: a lightweight and efficient screw evaporator, comprising a base, a condensing cylinder and a screw, wherein the base is arranged in an ice maker, the base and the screw are connected by a shaft seat, the screw is vertically arranged on the base, the condensing cylinder and the screw are coaxially arranged, and the screw is inside the condensing cylinder, a knife cover is arranged on the top of the condensing cylinder, a water inlet is arranged on the bottom of the outer side of the condensing cylinder, the outer edge of the screw thread contacts the inner wall of the condensing cylinder, a condensing cavity is arranged on the outer side of the condensing cylinder, the condensing cavity is an annular cavity as a whole, and at least three annular heat-conducting rings are arranged inside, a refrigerant inlet and a refrigerant outlet are arranged on the outer side of the screw, the refrigerant inlet is arranged above the refrigerant outlet, a screw capsule is arranged at the root of the screw thread, the screw capsule is filled with easily condensable liquid, a condensing cylinder air bag is arranged at the bottom of the condensing cylinder, and the condensing cylinder air bag is filled with easily volatile liquid;

[0006] Preferably, when the condensing cylinder is refrigerating, the volume of the liquid condensing inside the screw capsule expands, and the volume of the liquid condensing in the condensing cylinder air bag decreases. When the condensing cylinder is reversed and de-iced, the volume of the condensed liquid in the screw capsule melts and decreases, and the volume of the liquid in the condensing cylinder air bag expands due to evaporation.

[0007] Preferably, depressions are provided on the outer wall of the condensing tube and the inner wall of the condensing chamber, the position and shape of the depressions correspond to the heat-conducting ring, and the heat-conducting ring is tightly attached to the outer wall of the condensing tube and the inner wall of the condensing chamber. The heat-conducting ring is provided with notches, and the notches of different heat-conducting rings in the condensing chamber have different positions.

[0008] Preferably, a guide plate is provided above the notch of the heat-conducting ring, and the guide plate guides the fluid to move downward from the notch.

[0009] Preferably, the inner wall of the condensing cylinder is provided with spiral concave patterns.

[0010] Preferably, a screw cavity is provided at the top of the screw, a hole is provided on the side of the screw cavity, and the screw passes through the hole, and a heating tube can be arranged in the screw cavity.

[0011] Preferably, the liquid filled in the screw capsule is water, and the volatile liquid filled in the condenser air bag is Freon.

[0012] Preferably, the bearing inside the shaft seat is a ceramic bearing.

[0013] Preferably, chamfers are provided at the upper and lower edges of the screw thread, and the upper chamfer angle is greater than the lower chamfer angle.

[0014] (III) Beneficial effects: Compared with the prior art, the present invention provides a lightweight and efficient screw evaporator, which has the following beneficial effects:

[0015] 1. The lightweight and efficient screw evaporator, the water inside the screw capsule will condense quickly and expand in volume after being cooled. This volume change helps to enhance the cooling effect of the inner wall of the condenser tube, so that the pure water in the condenser tube can reach the condensation point more quickly and freeze evenly. At the same time, the low-temperature refrigerant in the condensation chamber exchanges heat with the condenser tube and the screw through multiple annular heat-conducting rings, ensuring the stability and uniformity of the entire condensation process. During the reverse heat de-icing process, the high-temperature refrigerant in the condensation chamber melts the condensed water in the screw capsule and reduces its volume, thereby forming a tiny gap between the screw and the ice cubes in the condenser tube, avoiding the close adhesion between the ice cubes and the screw. The formation of this tiny gap not only reduces the resistance of the ice cubes during the extrusion process, but also allows the ice cubes to be driven and extruded more smoothly by the screw, thereby improving the de-icing efficiency and the integrity of the ice cubes. At the same time, the fluorine in the condenser tube airbag After being heated, the vaporized volume of Leon expands, which generates an upward thrust on the ice in the condensing cylinder, helping to prevent part of the ice from remaining at the bottom, further ensuring the smoothness and integrity of ice removal. The overall design of the condensing chamber is annular, which not only improves the heat exchange efficiency between the refrigerant and the condensing cylinder and the screw, but also maintains the compactness of the structure. The setting of multiple annular heat-conducting rings further enhances the heat exchange effect, making the condensation process more efficient and stable. The volume change of the liquid in the screw capsule and the condensing cylinder airbag during the refrigeration and heat return process is a self-regulating mechanism, which ensures the stability and reliability of the ice-making and ice-removing processes. By optimizing the design of the condensing chamber and the screw capsule and selecting efficient heat-conducting materials, the heat exchange efficiency between the refrigerant and water is improved, and energy consumption is reduced. The application of this efficient heat exchange technology not only helps to reduce the operating cost of the equipment, but also conforms to the modern concept of energy conservation and environmental protection.

[0016] 2. The lightweight and efficient screw evaporator significantly increases the heat exchange area between the condensing cylinder and the refrigerant by arranging depressions corresponding to the heat-conducting ring on the outer wall of the condensing cylinder and the inner wall of the condensing chamber. This design enables the refrigerant to more fully exchange heat with the condensing cylinder, thereby improving the heat exchange efficiency. The heat-conducting ring is in close contact with the outer wall of the condensing cylinder and the inner wall of the screw, which not only fixes the heat-conducting ring but also improves the heat transfer efficiency through direct contact between solids. This design ensures that the heat of the refrigerant can be quickly and efficiently transferred to the condensing cylinder and the screw. There are notches on the heat-conducting ring, and the notches of different heat-conducting rings are in different positions. This design helps to evenly distribute and flow the refrigerant in the condensing chamber. At the same time, the setting of the guide plate can guide the fluid to move downward from the notch, further promoting the flow and mixing of the refrigerant and improving The utilization rate of the refrigerant is improved. The heat-conducting ring is in contact with the outer wall of the condensing tube and the inner wall of the condensing chamber at the same time, and a heat exchange channel is established. This design allows the heat lost by the refrigerant due to heat exchange in contact with the condensing chamber to be transferred to the condensing tube and the screw through the heat-conducting ring, thereby realizing the effective utilization of heat. By setting depressions on the outer wall of the condensing tube and the inner wall of the condensing chamber and installing heat-conducting rings, not only the heat exchange effect is enhanced, but also the stability and strength of the entire structure are improved. This design helps to reduce the vibration and noise generated by the equipment during operation, and improves the reliability and service life of the equipment. By optimizing the design of the condensing chamber 21 and the heat-conducting ring, the heat exchange efficiency between the refrigerant and the condensing tube 2 and the screw 22 is improved, and energy consumption is reduced. The application of this high-efficiency heat exchange technology helps to reduce the operating cost of the equipment and is in line with the modern concept of energy conservation and environmental protection.

[0017] 3. The lightweight and efficient screw evaporator increases the contact area between the inner wall of the condensing tube and the screw and condensed water through the spiral concave texture, thereby improving the heat exchange efficiency. This design allows the condensed water to exchange heat with the inner wall of the condensing tube more fully, accelerating the condensation process of water. The spiral concave texture increases the contact area between the inner wall of the condensing tube and the screw and condensed water, thereby improving the heat exchange efficiency. This design allows the condensed water to exchange heat with the inner wall of the condensing tube more fully, accelerating the condensation process of water. The design of the screw cavity can reduce the overall weight of the screw, making the screw more flexible when rotating and reducing energy consumption. The design of the screw cavity and side holes also facilitates the cleaning and maintenance of the screw, reducing maintenance costs and time. Ceramic bearings have a lower friction coefficient and higher wear resistance. Therefore, it can significantly reduce the noise level of the equipment during operation, improve the comfort and reliability of the equipment, and the ceramic bearings do not need to be lubricated with lubricating oil, avoiding the problem of lubricating oil contaminating the ice cubes. This design not only simplifies the maintenance process of the equipment, but also improves the purity and quality of the ice cubes. The chamfers on the upper and lower edges of the screw thread can reduce the friction and wear between the screw thread edge and the inner wall of the condensing cylinder, thereby extending the service life of the screw and the condensing cylinder. The design in which the upper chamfer angle is greater than the lower chamfer angle can make the ice cubes easier to be squeezed out during the rising process of the screw. This design helps to reduce the jamming of ice cubes between the screw and the condensing cylinder, thereby improving the ice-making efficiency. The chamfered design can also reduce the breakage and deformation of ice cubes during the extrusion process, thereby improving the integrity and quality of the ice cubes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 It is a schematic cross-sectional view of the screw of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0021] Figure 4 It is a schematic diagram of the screw structure of the present invention;

[0022] Figure 5 It is a schematic diagram of the structure of the heat-conducting ring of the present invention;

[0023] Figure 6 It is a plane schematic diagram of the guide plate of the present invention;

[0024] Figure 7 It is a schematic diagram of the screw cavity of the present invention.

[0025] In the figure: 1, base; 2, condensation cylinder; 21, condensation chamber; 22, screw; 23, knife cover; 201, water inlet; 202, shaft seat; 211, refrigerant inlet; 212, refrigerant outlet; 213, heat transfer ring; 214, guide plate; 221, screw capsule; 222, screw cavity. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 4 The lightweight and efficient screw evaporator comprises a base 1, a condensing cylinder 2 and a screw 22. The base 1 is arranged in the ice maker. The base 1 and the screw 22 are connected by a shaft seat 202. The screw 22 is vertically arranged on the base 1. The condensing cylinder 2 and the screw 22 are coaxially arranged, and the screw 22 is inside the condensing cylinder 2. A pressure knife cover 23 is arranged on the top of the condensing cylinder 2. A water inlet 201 is arranged on the bottom of the outer side of the condensing cylinder 2. The outer edge of the screw 22 thread contacts the inner wall of the condensing cylinder 2. A condensing chamber 21 is arranged on the outer side of the condensing cylinder 2. The condensing chamber 21 is annular as a whole. shaped cavity, and at least three annular heat-conducting rings 213 are arranged inside, a refrigerant inlet 211 and a refrigerant outlet 212 are arranged on the outside of the screw 22, the refrigerant inlet 211 is arranged above the refrigerant outlet 212, a screw capsule 221 is arranged at the root of the thread of the screw 22, and the inside of the screw capsule 221 is filled with condensable liquid, a condenser airbag is arranged at the bottom of the condenser cylinder 2, and the condenser airbag is filled with volatile liquid, a notch is arranged at the root of the thread of the screw 22, and the outer diameter of the notch is small, and the screw capsule 221 is strip-shaped as a whole, which is inserted into the notch to achieve fixation (see Figure 2 );

[0028] When the condensing cylinder 2 is cooling, the volume of the liquid condensing inside the screw capsule 221 expands, and the volume of the liquid condensing in the condensing cylinder airbag decreases. When the condensing cylinder 2 is de-icing by reverse heat, the volume of the condensed liquid in the screw capsule 221 melts and decreases, and the volume of the liquid in the condensing cylinder airbag expands due to evaporation. The liquid filled in the screw capsule 221 is water, and the volatile liquid filled in the condensing cylinder airbag is Freon.

[0029] Pure water is injected into the condensing cylinder 2 through the water inlet 201, and low-temperature refrigerant is injected into the condensing chamber 21 through the refrigerant inlet 211 to exchange heat with the condensing cylinder 2 and the screw 22 to reduce the temperature, so that the water temperature in the condensing cylinder 2 is reduced to the condensation point. At the same time, the screw capsule 221 is cooled, the internal water condenses, and the volume expands. The Freon inside the condensing cylinder airbag at the bottom of the condensing cylinder 2 is liquefied when it is cooled and the volume becomes smaller. When the water in the condensing cylinder 2 is frozen, the condensing cylinder 2 drives the screw 22 to rotate, and the high-temperature refrigerant is introduced into the condensing chamber 21 to reverse the heat and prevent the ice cubes from sticking to the inner wall of the condensing cylinder 2. The ice cubes are driven upward by the screw 22 and are squeezed out from the pressure knife cover 23 The ice cubes in the condensing cylinder 2 are crushed and extruded to form extruded granular ice. When the high-temperature refrigerant is introduced into the condensing chamber 21, the heat is transferred to the screw capsule 221 and the condensing cylinder capsule through the condensing cylinder 2 and the screw 22, so that they are heated. The condensed water in the screw capsule 221 melts and its volume shrinks, so that the ice cubes condensed in the condensing cylinder 2 and the screw 22 directly form a tiny gap, which avoids adhesion and ensures that the ice will not encounter excessive resistance during the extrusion process, thereby facilitating the smooth extrusion of the ice. When the condensing cylinder capsule is heated, the liquid Freon inside vaporizes and expands in volume, which generates an upward thrust on the ice cubes in the condensing cylinder 2, avoiding that part of the ice cubes remain at the bottom and affect the next ice-making process.

[0030] See also Figure 5-Figure 6 The outer wall of the condensing tube 2 and the inner wall of the condensing chamber 21 are provided with depressions, the position and shape of the depressions correspond to the heat-conducting ring 213, and the heat-conducting ring 213 is in close contact with the outer wall of the condensing tube 2 and the inner wall of the condensing chamber 21. The heat-conducting ring 213 is provided with a notch, and the notch positions of different heat-conducting rings 213 in the condensing chamber 21 are different. A guide plate 214 is provided above the notch of the heat-conducting ring 213, and the guide plate 214 guides the fluid to move downward from the notch, and the heat exchange area between the condensing tube 2 and the refrigerant is increased through the depression. At the same time, the heat conducting ring 213 can be better fixed in the condensing chamber 21. Through the contact between solids, good heat conduction can be achieved, thereby improving the utilization rate of the refrigerant. The heat conducting ring 213 is in contact with the outer wall of the condensing tube 2 and the inner wall of the condensing chamber 21 at the same time, and a heat exchange channel is established, so that the heat lost by the refrigerant due to the contact and heat exchange with the condensing chamber 21 can be utilized, and the notch of the heat conducting ring 213 and the guide plate 214 are utilized, so that the refrigerant can flow better and fill the entire condensing chamber 21.

[0031] See also Figure 2The inner wall of the condensing cylinder 2 is provided with a spiral concave pattern. The spiral concave pattern increases the surface area of ​​the inner wall of the condensing cylinder, increases the contact area with the condensed water and the screw, thereby increasing the surface area of ​​heat exchange. According to the basic principle of heat exchange, the increase in surface area will increase the rate of heat exchange, so this design can significantly enhance the heat exchange effect. When the condensed water condenses into ice, the spiral pattern can reduce the contact area between the ice cubes and the inner wall of the condensing cylinder, thereby reducing the friction resistance of the ice cubes during the rising process of the screw. According to the principle of friction, the reduction in contact area will reduce friction, so this design can make the ice cubes more smoothly driven and squeezed out by the screw. A screw cavity 222 is provided at the top of the rod 22, and a hole is provided on the side of the screw cavity 222, which passes through the screw 22. The design of the screw cavity reduces the solid part of the screw, thereby reducing the overall weight of the screw. According to the principle of material mechanics, the weight reduction can reduce the inertia force of the screw during rotation, making the screw easier to start and accelerate. The design of the screw cavity and the side holes facilitates the cleaning and maintenance of the screw. The dirt and residue inside the screw can be more easily cleaned through the cavity and the side holes, reducing maintenance costs and time. A heating tube can be set in the screw cavity 222, and the heat is better transferred to the screw capsule 221 by heating the inside of the screw 22.

[0032] The bearing inside the shaft seat 202 adopts a ceramic bearing. The ceramic bearing has lower noise, a lower friction coefficient and higher wear resistance. According to the principle of tribology, the reduction of the friction coefficient can reduce the friction and vibration of the bearing during rotation, thereby reducing the noise level. At the same time, the ceramic material has higher rigidity and can better resist deformation and vibration, further reducing noise. It does not require the addition of lubricating oil, thus avoiding contamination by ice cubes. The self-lubricating property of the ceramic bearing means that it does not require the addition of lubricating oil for lubrication. This is because the ceramic material itself has a lower friction coefficient and higher wear resistance, and can maintain a good operating state without lubrication. This design avoids the problem of lubricating oil contaminating the ice cubes and improves the purity and quality of the ice cubes.

[0033] See also Figure 2, the screw 22 thread edge is provided with chamfers at the top and bottom, and the upper chamfer angle is greater than the lower chamfer angle. The chamfers provided at the top and bottom can reduce the friction and wear between the screw thread edge and the inner wall of the condensing tube. According to the principle of tribology, the chamfer design can reduce the contact area and friction coefficient, thereby reducing the wear rate. This design prolongs the service life of the screw and the condensing tube. The design that the upper chamfer angle is greater than the lower chamfer angle can make the ice cubes easier to be squeezed out during the screw rising process. This is because the existence of the upper chamfer can reduce the angle between the ice cube and the screw thread edge, making the ice cube more likely to deform and break when subjected to the screw thrust. At the same time, the existence of the lower chamfer can prevent the ice cube from being stuck or damaged during the screw descent process. The chamfer design can also reduce the crushing and deformation of the ice cube during the extrusion process. This is because the chamfer can reduce the friction and extrusion force between the ice cube and the screw thread edge, thereby avoiding excessive deformation and crushing of the ice cube during the extrusion process. This design improves the integrity and quality of the ice cube.

[0034] Working principle: Pure water is injected into the condensing cylinder 2 through the water inlet 201, and low-temperature refrigerant is injected into the condensing chamber 21 through the refrigerant inlet 211, and heat is exchanged with the condensing cylinder 2 and the screw 22 to cool down the water temperature in the condensing cylinder 2 to the condensation point. At the same time, the screw capsule 221 is cooled, the internal water condenses, and the volume expands. The Freon inside the condensing cylinder airbag at the bottom of the condensing cylinder 2 is liquefied when it is cooled and the volume becomes smaller. When the water in the condensing cylinder 2 is frozen, the condensing cylinder 2 drives the screw 22 to rotate, and the high-temperature refrigerant is introduced into the condensing chamber 21 to reverse the heat and prevent the ice from sticking to the inner wall of the condensing cylinder 2. The ice is driven upward by the screw 22 and is squeezed out from the pressure knife cover 23. The ice cubes in the condensing cylinder 2 are crushed and extruded to form extruded granular ice. When the high-temperature refrigerant is introduced into the condensing chamber 21, the heat is transferred to the screw capsule 221 and the condensing cylinder capsule through the condensing cylinder 2 and the screw 22, so that they are heated. The condensed water in the screw capsule 221 melts and its volume shrinks, so that the ice cubes condensed in the condensing cylinder 2 and the screw 22 directly form a tiny gap, which avoids adhesion and ensures that the ice will not encounter excessive resistance during the extrusion process, thereby facilitating the smooth extrusion of the ice. When the condensing cylinder capsule is heated, the liquid Freon inside vaporizes and expands in volume, which generates an upward thrust on the ice cubes in the condensing cylinder 2, avoiding that part of the ice cubes remain at the bottom and affect the next ice-making process.

[0035] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0036] Although 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 the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lightweight and efficient screw evaporator, comprising a base (1), a condensing cylinder (2) and a screw (22), wherein the base (1) is arranged in an ice making machine, the base (1) and the screw (22) are connected via a shaft seat (202), the screw (22) is vertically arranged on the base (1), the condensing cylinder (2) and the screw (22) are coaxially arranged, and the screw (22) is inside the condensing cylinder (2), a knife cover (23) is arranged on the top of the condensing cylinder (2), and a water inlet (201) is arranged on the outer bottom of the condensing cylinder (2), characterized in that: The outer edge of the thread of the screw rod (22) contacts the inner wall of the condensing tube (2), and a condensing chamber (21) is provided on the outer side of the condensing tube (2). The condensing chamber (21) is an annular cavity as a whole, and at least three annular heat-conducting rings (213) are provided inside. A refrigerant inlet (211) and a refrigerant outlet (212) are provided on the outer side of the screw rod (22), and the refrigerant inlet (211) is arranged above the refrigerant outlet (212). The thread root of the screw rod (22) is provided with a screw thread. The screw bladder (221) is filled with a condensable liquid, and a condenser airbag is provided at the bottom of the condenser cylinder (2), and the condenser airbag is filled with a volatile liquid; when the condenser cylinder (2) is refrigerated, the liquid inside the screw bladder (221) condenses and the volume expands, and the condensation volume of the liquid in the condenser airbag decreases; when the condenser cylinder (2) is de-iced by reverse heat, the condensed liquid in the screw bladder (221) melts and the volume decreases, and the liquid in the condenser airbag evaporates and the volume expands.

2. The lightweight and efficient screw evaporator according to claim 1 is characterized in that: The outer wall of the condensing cylinder (2) and the inner wall of the condensing chamber (21) are provided with depressions, the position and shape of the depressions correspond to the heat-conducting ring (213), and the heat-conducting ring (213) is in close contact with the outer wall of the condensing cylinder (2) and the inner wall of the condensing chamber (21), and the heat-conducting ring (213) is provided with notches, and different heat-conducting rings (213) in the condensing chamber (21) have different notch positions.

3. The lightweight and efficient screw evaporator according to claim 2 is characterized in that: A guide plate (214) is provided above the notch of the heat-conducting ring (213), and the guide plate (214) guides the fluid to move downward from the notch.

4. The lightweight and efficient screw evaporator according to claim 1 is characterized in that: The inner wall of the condensing cylinder (2) is provided with spiral concave patterns.

5. The lightweight and efficient screw evaporator according to claim 1 is characterized in that: A screw cavity (222) is provided at the top of the screw (22), a hole is provided on the side of the screw cavity (222) and passes through the screw (22), and a heating tube is arranged in the screw cavity (222).

6. The lightweight and efficient screw evaporator according to claim 1 is characterized in that: The liquid filled in the screw capsule (221) is water, and the volatile liquid filled in the condenser air bag is Freon.

7. The lightweight and efficient screw evaporator according to claim 1 is characterized in that: The bearing in the shaft seat (202) is a ceramic bearing.

8. The lightweight and efficient screw evaporator according to claim 1 is characterized in that: The thread edge of the screw rod (22) is provided with chamfers at the top and bottom, and the angle of the upper chamfer is greater than that of the lower chamfer.

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