High-performance heat-resistant connecting hose processing equipment and processing technology

Abstract

The application relates to a high-performance heat-resistant connecting hose processing device and a processing technology, and relates to the field of rubber tube processing equipment. The high-performance heat-resistant connecting hose processing device comprises an injection molding machine body and a cooling device. The cooling device comprises a base, a cooling sleeve and a cooling circulation component. The cooling sleeve is arranged on the base and is horizontally arranged in a circular column shape. The inside of the cooling sleeve is hollow. The cooling sleeve is filled with liquid carbon dioxide used for cooling the hose. The hose is coaxially and horizontally arranged in the cooling sleeve. The cooling circulation component is communicated with the cooling sleeve and is used for cooling the liquid carbon dioxide in the cooling sleeve. The liquid carbon dioxide has good cooling effect. The cooling circulation component can continuously keep the liquid carbon dioxide in a low-temperature state, so that new refrigerants are not needed to be added for circulation, the consumption of the cooling medium is reduced, and energy saving and environmental protection are facilitated.

Description

Technical Field

[0001] This application relates to the field of rubber hose processing equipment, and in particular to a high-performance heat-resistant connecting hose processing equipment and processing technology. Background Technology

[0002] Connecting hoses are an important component in automobiles, primarily used to connect fluid lines between different systems or parts, such as hydraulic lines, coolant lines, and intake lines. Connecting hoses are typically made of rubber.

[0003] A rubber hose injection molding machine is a specialized piece of equipment for producing rubber hoses. It uses injection molding technology, heating and melting rubber material before injecting it into a mold. After cooling and solidification, a rubber hose is formed. Rubber hose injection molding machines offer advantages such as high production efficiency, stable product quality, and simple operation, and are widely used in the automotive, machinery, and construction industries.

[0004] However, in the use of rubber hose injection molding machines in related technologies, water cooling is typically used when cooling the rubber tube preform. Water cooling generally involves introducing the rubber tube preform into a cooling tank for cooling. After a period of use, residue accumulates in the cooling tank, which may adhere to the rubber tube preform, affecting subsequent processing and ultimately impacting the product quality. Furthermore, water cooling causes the cooling water in the tank to heat up rapidly, resulting in very fast temperature changes. This makes it difficult to precisely control the cooling process, potentially leading to deformation or other problems with the rubber tube. Maintaining a constant water temperature requires continuous circulation of the cooling water in the tank, which consumes a large amount of water and is not energy-efficient or environmentally friendly. Summary of the Invention

[0005] In order to improve the defects in the cooling and molding of rubber tube blanks in related technologies, this application provides a high-performance heat-resistant connecting hose processing equipment and processing technology.

[0006] The high-performance heat-resistant flexible hose processing equipment provided in this application adopts the following technical solution: A high-performance heat-resistant connecting hose processing equipment includes an injection molding machine body and a cooling device, wherein the cooling device is located at the discharge port of the injection molding machine body; The cooling device includes a base, a cooling jacket, and a cooling circulation component. The cooling jacket is mounted on the base and is a horizontally positioned annular cylindrical shape. The interior of the cooling jacket is hollow and filled with liquid carbon dioxide for cooling a flexible tube. The flexible tube is coaxially and horizontally inserted into the cooling jacket. The cooling circulation component is connected to the cooling jacket and is used to cool the liquid carbon dioxide inside the cooling jacket, thereby enabling the liquid carbon dioxide to be recycled.

[0007] By adopting the above technical solution, the raw material is heated and melted by the injection molding machine body and injected into the mold. After high-temperature extrusion, a hose preform is formed. When the hose preform comes out of the discharge port of the injection molding machine body, it immediately enters the cooling jacket. The liquid carbon dioxide in the cooling jacket will carry away the heat of the hose through heat transfer, thereby achieving a rapid cooling effect. During the cooling process, the cooling circulation component is connected to the cooling jacket. At regular intervals, the cooling circulation component cools the liquid carbon dioxide in the cooling jacket, so that the liquid carbon dioxide can be kept at a low temperature during the circulation process.

[0008] The aforementioned cooling device eliminates the need for direct contact between the hose and the cooling medium, thus preventing cooling residue from adhering to the rubber tube blank. Furthermore, the liquid carbon dioxide provides excellent cooling performance. The cooling circulation component maintains the liquid carbon dioxide at a consistently low temperature, eliminating the need to add new refrigerant and reducing cooling medium consumption, which is beneficial for energy conservation and environmental protection.

[0009] Optionally, the cooling circulation component includes a drain pipe, a sealed expansion tank, a pressurizing pump, and an inlet pipe. One end of the drain pipe is fixedly connected to the end of the cooling jacket, and the other end is connected to the sealed expansion tank. The sealed expansion tank is fixedly connected to the pressurizing pump through a pipe. One end of the inlet pipe is connected to the outlet of the pressurizing pump, and the other end is fixedly connected to the end of the other end of the cooling jacket. Both the drain pipe and the inlet pipe are connected to a shut-off valve.

[0010] By adopting the above technical solution, after a period of cooling, the temperature of the liquid carbon dioxide rises. At this point, it is necessary to cool the liquid carbon dioxide to maintain a good cooling effect. During the cooling process, the shut-off valve on the drain pipe is opened, and the liquid carbon dioxide flows into the sealed expansion tank through the shut-off valve. A portion of the liquid carbon dioxide vaporizes due to volume expansion, leading to a decrease in the overall temperature within the sealed expansion tank, thus cooling the liquid carbon dioxide. Then, the pressurization pump is turned on to send the liquid carbon dioxide into the cooling jacket for repeated cooling. The above-mentioned cooling circulation system can achieve repeated recycling of liquid carbon dioxide without the need for an additional cooling medium, offering good economic efficiency and convenience.

[0011] Optionally, the cooling device further includes a rotating assembly, the cooling jacket is rotatably connected to the base through the rotating assembly, the rotation axis of the cooling jacket is horizontally set, and end caps that are rotatably sealed on both ends of the cooling jacket are provided, and the drain pipe and the inlet pipe are fixedly connected to the two end caps at both ends of the cooling jacket respectively.

[0012] By adopting the above technical solution, the cooling jacket can be rotated by the rotating component, so that the liquid carbon dioxide inside the cooling jacket can maintain a uniform temperature, thereby maintaining a uniform cooling effect.

[0013] Optionally, the rotating assembly includes a support member, a motor, a gear, and a gear ring. The support member provides support for the cooling jacket. The housing of the motor is fixedly connected to the support member. The gear is coaxially fixedly connected to the output shaft of the motor. The gear ring is coaxially fixedly connected to the cooling jacket, and the gear meshes with the gear ring.

[0014] By adopting the above technical solution, when it is necessary to drive the cooling jacket to rotate, the motor is started, the output shaft of the motor drives the gear to rotate, the gear rotates and drives the gear ring to rotate, which in turn drives the cooling jacket to rotate. The above structure has the advantages of high transmission reliability and smooth transmission, so it is easy to control the rotation of the cooling jacket, reduces the number of manual operation steps, and greatly improves the automation level of the processing equipment.

[0015] Optionally, two support members are provided, located on both sides of the cooling sleeve along the axial direction. Each support member includes a mounting base, a rotating shaft disposed on the mounting base, and a drive wheel disposed on the rotating shaft. The mounting base is fixedly connected to the base, and the rotating shaft is rotatably connected to the mounting base. The rotation axis of the rotating shaft is parallel to the axis of the cooling sleeve. The rotating shafts of the two support members are arranged parallel to each other. Multiple drive wheels are provided, and the multiple drive wheels are evenly distributed along the axial direction of the two rotating shafts. The drive wheels are coaxially fixedly connected to the rotating shafts, and the drive wheels abut against the outer wall of the cooling sleeve.

[0016] By adopting the above technical solution and using the above-mentioned support member to support the cooling jacket, the load on the hose can be reduced, thereby reducing the problem of hose damage. By rotating the drive wheel to contact the outer wall of the cooling jacket, the friction between the cooling jacket and the support member can be reduced, which helps to keep the cooling jacket stable during rotation.

[0017] Optionally, the drive wheel peripheral wall is provided with a slot, and the cooling sleeve outer wall is coaxially fixedly connected with a retaining ring, which is engaged in the slot.

[0018] By adopting the above technical solution, when the cooling jacket rotates, the retaining ring engages in the retaining groove, thereby limiting the cooling jacket and preventing it from sliding along the drive wheel axis during rotation. This further enhances the stability of the cooling jacket during rotation.

[0019] Optionally, the cooling device further includes a stirring component, which includes a stirring rod, spiral blades, and a driving component. The stirring rod is located inside the cooling jacket, and its two ends are rotatably connected to the end caps at both ends of the cooling jacket. The spiral blades are spirally distributed along the axial direction of the stirring rod and are fixedly connected to the stirring rod. The driving component is used to drive the stirring rod to rotate.

[0020] By adopting the above technical solution, the liquid carbon dioxide in the cooling jacket can be further stirred axially by setting a stirring component. Because the temperature of the hose is highest when it first extends out of the injection molding machine and then gradually decreases, the temperature of the liquid carbon dioxide is also higher on the side closer to the injection molding machine. In order to keep the temperature of the liquid carbon dioxide in the cooling jacket uniform, a stirring rod and a spiral blade are set to stir the liquid carbon dioxide in the cooling jacket, which helps to keep the temperature of the liquid carbon dioxide uniform and thus ensures a better cooling effect.

[0021] Optionally, the drive component includes pulleys and a belt. There are two pulleys. One pulley is coaxially and fixedly connected to one end of the rotating shaft, and the other pulley is coaxially and fixedly connected to the end of the stirring rod extending out of the cooling sleeve. The belt is tensioned and sleeved on the two pulleys.

[0022] By adopting the above technical solution, the driving component of the above structure includes a pulley and a belt, which realizes the rotation of the stirring rod. The structure is simple and easy to maintain.

[0023] This application also provides a processing technology for high-performance heat-resistant connecting hoses, employing the following technical solution: A high-performance heat-resistant connecting hose processing technology, using the aforementioned processing equipment, includes the following steps: S1. Injection molding: The raw materials are heated and melted by the injection molding machine body and injected into the mold. After being extruded at high temperature, a tube preform is formed. S2. Cooling treatment: After the hose blank comes out of the discharge port of the injection molding machine body, it immediately enters the cooling jacket. One end of the hose blank passes through the cooling jacket to form the finished hose. S3, Cooling Circulation: During the cooling process, the cooling circulation component is connected to the cooling jacket. At regular intervals, the liquid carbon dioxide in the cooling jacket is cooled by the cooling circulation component, so that the liquid carbon dioxide can maintain a low temperature during the circulation process.

[0024] By adopting the above technical solution and processing equipment, the above-mentioned processing technology can achieve rapid cooling of the hose, improve production efficiency, and ensure hose quality. Furthermore, it can reduce the material and time costs required for cooling, thereby contributing to improved quality and efficiency.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes liquid carbon dioxide within the cooling jacket to remove heat from the hose via heat transfer, achieving rapid cooling. During the cooling process, a cooling circulation component is connected to the cooling jacket, periodically cooling the liquid carbon dioxide within the jacket, ensuring it remains at a low temperature during circulation. This cooling device eliminates the need for the hose to directly contact the cooling medium, preventing cooling residue from adhering to the rubber tube blank, and provides excellent cooling performance using liquid carbon dioxide. The cooling circulation component maintains the liquid carbon dioxide at a consistently low temperature, eliminating the need to add new refrigerant, reducing cooling medium consumption, and promoting energy conservation and environmental protection. 2. This application uses a drain pipe, a sealed expansion tank, a pressurizing pump, and an inlet pipe as a cooling circulation component. During cooling, the shut-off valve on the drain pipe is opened, and then liquid carbon dioxide flows into the sealed expansion tank through the shut-off valve. A portion of the liquid carbon dioxide vaporizes due to volume expansion, leading to a decrease in the overall temperature inside the sealed expansion tank, thus cooling the liquid carbon dioxide. Then, the pressurizing pump is turned on to send the liquid carbon dioxide into the cooling jacket for repeated cooling. The above-mentioned cooling circulation component eliminates the need for an additional medium to cool the liquid carbon dioxide, enabling its repeated recycling and offering good economic efficiency and convenience. 3. By incorporating a stirring element and a horizontally rotating cooling jacket, this application can effectively agitate the liquid carbon dioxide within the cooling jacket, thereby ensuring a uniform temperature of the carbon dioxide and thus guaranteeing a better cooling effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the cooling jacket of the cooling device according to an embodiment of this application; Figure 3 This is a cross-sectional view of the cooling jacket of the cooling device according to an embodiment of this application.

[0027] Reference numerals: 1. Injection molding machine body; 2. Cooling device; 21. Base; 22. Cooling jacket; 221. End cap; 222. Snap ring; 23. Rotating assembly; 231. Motor; 232. Gear; 233. Gear ring; 234. Mounting seat; 235. Rotating shaft; 236. Drive wheel; 24. Agitator; 241. Agitator rod; 242. Spiral blade; 243. Pulley; 244. Belt; 25. Cooling circulation component; 251. Drain pipe; 252. Sealed expansion tank; 253. Pressure pump; 254. Inlet pipe; 255. Shut-off valve. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0029] This application discloses a high-performance heat-resistant connecting hose processing equipment. (Refer to...) Figure 1 A high-performance heat-resistant connecting hose processing equipment includes an injection molding machine body 1 and a cooling device 2.

[0030] Reference Figure 1 and Figure 2 The cooling device 2 is located at the discharge port of the injection molding machine body 1. The cooling device 2 includes a base 21, a cooling jacket 22, a rotating component 23, a stirring component 24, and a cooling circulation component 25.

[0031] Reference Figure 2 and Figure 3 The cooling sleeve 22 and the rotating assembly 23 are mounted on the base 21. The cooling sleeve 22 is a horizontally arranged annular column. The interior of the cooling sleeve 22 is hollow. End caps 221 that are rotatably sealed to the cooling sleeve 22 are provided on both ends of the cooling sleeve 22. The cooling sleeve 22 is filled with liquid carbon dioxide for cooling the hose.

[0032] Reference Figure 2 and Figure 3The rotating assembly 23 includes a support member, a motor 231, a gear 232, and a gear ring 233. The support member provides support for the cooling sleeve 22. Two support members are provided, located on opposite sides of the cooling sleeve 22 along its axial direction. Each support member includes a mounting base 234, a rotating shaft 235 mounted on the mounting base 234, and a drive wheel 236 mounted on the rotating shaft 235. The mounting base 234 is fixedly connected to the base 21, and the rotating shaft 235 is rotatably connected to the mounting base 234. The axis of rotation of the rotating shaft 235 is parallel to the axis of the cooling sleeve 22. The rotating shafts 235 of the two support members are arranged parallel to each other. Multiple drive wheels 236 are provided, evenly distributed along the axial direction of the two rotating shafts 235. The drive wheels 236 are coaxially and fixedly connected to the rotating shafts 235. A groove is formed on the peripheral wall of each drive wheel 236. A retaining ring 222 is coaxially and fixedly connected to the outer wall of the cooling sleeve 22, and the retaining ring 222 engages within the groove. The flexible hose that extends out of the injection molding machine body 1 is coaxially and horizontally inserted into the cooling jacket 22. The heat of the hose is carried away by liquid carbon dioxide, thereby achieving a rapid cooling effect.

[0033] Reference Figure 2 and Figure 3 The stirring component 24 includes a stirring rod 241, a spiral blade 242, and a driving component. The stirring rod 241 is located inside the cooling jacket 22, and its two ends are rotatably connected to the end caps 221 at both ends of the cooling jacket 22. The spiral blades 242 are spirally distributed along the axial direction of the stirring rod 241 and are fixedly connected to the stirring rod 241. The driving component includes pulleys 243 and a belt 244. There are two pulleys 243. One pulley 243 is coaxially and fixedly connected to the end of a rotating shaft 235, and the other pulley 243 is coaxially and fixedly connected to the end of the stirring rod 241 extending out of the cooling jacket 22. The belt 244 is tensioned and sleeved on the two pulleys 243.

[0034] Reference Figure 1 and Figure 2 The cooling circulation component 25 includes a drain pipe 251, a sealed expansion tank 252, a pressurizing pump 253, and an inlet pipe 254. One end of the drain pipe 251 is fixedly connected to the end cap 221 of one end of the cooling jacket 22, and the other end is connected to the sealed expansion tank 252. The sealed expansion tank 252 is fixedly connected to the pressurizing pump 253 through a pipe. One end of the inlet pipe 254 is connected to the outlet of the pressurizing pump 253, and the other end is fixedly connected to the end cap 221 of the other end of the cooling jacket 22. Both the drain pipe 251 and the inlet pipe 254 are connected to a shut-off valve 255.

[0035] The implementation principle of the high-performance heat-resistant connecting hose processing equipment in this application embodiment is as follows: Raw materials are heated and melted by the injection molding machine body 1 and injected into the mold. After high-temperature extrusion, a hose preform is formed. When the hose preform exits from the discharge port of the injection molding machine body 1, it immediately enters the cooling jacket 22. The liquid carbon dioxide inside the cooling jacket 22 carries away the heat from the hose through heat transfer, thereby achieving a rapid cooling effect. Using liquid carbon dioxide as the cooling medium eliminates the need for the hose to directly contact the cooling medium, thus preventing cooling residue from adhering to the rubber hose preform. Furthermore, liquid carbon dioxide provides a superior cooling effect.

[0036] After cooling for a period of time, the temperature of the liquid carbon dioxide rises. At this point, it is necessary to cool the liquid carbon dioxide to maintain a good cooling effect. During the cooling process, the shut-off valve 255 on the drain pipe 251 is opened, and then the liquid carbon dioxide flows into the sealed expansion tank 252 through the shut-off valve 255. A portion of the liquid carbon dioxide vaporizes due to volume expansion, which in turn lowers the overall temperature inside the sealed expansion tank, thereby cooling the liquid carbon dioxide. Then, the pressurization pump 253 is turned on to send the liquid carbon dioxide into the cooling jacket 22 for recooling.

[0037] During the cooling process, motor 231 is started. The output shaft of motor 231 drives gear 232 to rotate. When gear 232 rotates, it drives gear ring 233 to rotate, which in turn drives cooling jacket 22 to rotate. This creates a circulating flow of liquid carbon dioxide within cooling jacket 22, maintaining a uniform temperature for the liquid carbon dioxide. When motor 231 drives cooling jacket 22 to rotate, the rotating shaft 235 of the support member drives stirring rod 241 to rotate via belt 244 and pulley 243. This drives spiral blades 242 to stir the liquid carbon dioxide axially within cooling jacket 22, ensuring sufficient flow of liquid carbon dioxide and maintaining temperature uniformity.

[0038] This embodiment also discloses a processing technology for high-performance heat-resistant connecting hoses, using the aforementioned processing equipment, and including the following steps: S1. Injection molding: The raw material is heated and melted by the injection molding machine body 1 and injected into the mold. After being extruded at high temperature, a hose preform is formed. S2. Cooling treatment: When the hose blank comes out of the discharge port of the injection molding machine body 1, it immediately enters the cooling jacket 22. The liquid carbon dioxide in the cooling jacket 22 will carry away the heat of the hose through heat transfer, thereby achieving the effect of rapid cooling. After one end of the hose blank passes through the cooling jacket 22, it forms a finished hose. S3, Cooling Circulation: During the cooling process, the cooling circulation component 25 is connected to the cooling jacket 22. At regular intervals, the cooling circulation component 25 cools the liquid carbon dioxide in the cooling jacket 22, so that the liquid carbon dioxide can maintain a low temperature during the cycle.

[0039] The aforementioned processing technology, using this equipment, enables rapid cooling of the hoses, improving production efficiency while ensuring hose quality. Furthermore, it reduces material and time costs associated with cooling, thus contributing to improved quality and efficiency.

[0040] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-performance heat-resistant connecting hose processing equipment, characterized in that: It includes an injection molding machine body (1) and a cooling device (2), wherein the cooling device (2) is located at the discharge port of the injection molding machine body (1); The cooling device (2) includes a base (21), a cooling sleeve (22), and a cooling circulation component (25). The cooling sleeve (22) is disposed on the base (21) and is a horizontally arranged annular cylindrical shape. The interior of the cooling sleeve (22) is hollow and filled with liquid carbon dioxide for cooling the hose. The hose is coaxially and horizontally inserted inside the cooling sleeve (22). The cooling circulation component (25) is connected to the cooling sleeve (22) and is used to cool the cooling sleeve (22). The liquid carbon dioxide inside is cooled, allowing the liquid carbon dioxide to be recycled. The cooling circulation component (25) includes a drain pipe (251), a sealed expansion tank (252), a pressurizing pump (253), and an inlet pipe (254). One end of the drain pipe (251) is fixedly connected to the end of the cooling jacket (22), and the other end is connected to the sealed expansion tank (252). The sealed expansion tank (252) is fixedly connected to the pressurizing pump (253) through a pipe. One end of the inlet pipe (254) is connected to the outlet of the pressurizing pump (253). The other end is fixedly connected to the other end of the cooling sleeve (22), and both the drain pipe (251) and the inlet pipe (254) are connected to a shut-off valve (255); the cooling device (2) also includes a rotating assembly (23), the cooling sleeve (22) is rotatably connected to the base (21) through the rotating assembly (23), the rotation axis of the cooling sleeve (22) is horizontally set, and end caps (221) that are rotatably sealed to the cooling sleeve (22) are provided on both end walls of the cooling sleeve (22), and the drain pipe (251) and the inlet pipe (254) are respectively The two end caps (221) at both ends of the cooling sleeve (22) are fixedly connected; the rotating assembly (23) includes a support member, a motor (231), a gear (232) and a gear ring (233). The support member is used to provide support for the cooling sleeve (22). The housing of the motor (231) is fixedly connected to the support member. The gear (232) is coaxially fixedly connected to the output shaft of the motor (231). The gear ring (233) is coaxially fixedly connected to the cooling sleeve (22). The gear (232) meshes with the gear ring (233).Two supports are provided, located on both sides of the cooling sleeve (22) along the axial direction. Each support includes a mounting base (234), a rotating shaft (235) mounted on the mounting base (234), and a drive wheel (236) mounted on the rotating shaft (235). The mounting base (234) is fixedly connected to the base (21), and the rotating shaft (235) is rotatably connected to the mounting base (234). The rotation axis of the rotating shaft (235) is parallel to the axis of the cooling sleeve (22). The two support members have their rotating shafts (235) arranged parallel to each other. Multiple drive wheels (236) are provided, evenly distributed along the axial direction of the two rotating shafts (235). Each drive wheel (236) is coaxially and fixedly connected to the rotating shaft (235), and abuts against the outer wall of the cooling sleeve (22). A groove is provided on the peripheral wall of each drive wheel (236), and a retaining ring (222) is coaxially and fixedly connected to the outer wall of the cooling sleeve (22). The ring (222) is engaged in the slot; the cooling device (2) also includes a stirring component (24), which includes a stirring rod (241), a spiral blade (242), and a driving component. The stirring rod (241) is eccentrically located at the inner bottom of the cooling sleeve (22). The two ends of the stirring rod (241) are rotatably connected to the end caps (221) at both ends of the cooling sleeve (22). The spiral blades (242) are spirally distributed along the axial direction of the stirring rod (241) and are driven by the stirring rod (241). 241) Fixed connection, the driving component is used to drive the stirring rod (241) to rotate; the driving component includes pulleys (243) and belts (244), there are two pulleys (243), one pulley (243) is coaxially fixedly connected to one end of the rotating shaft (235), and the other pulley (243) is coaxially fixedly connected to the end of the stirring rod (241) extending out of the cooling sleeve (22), and the belt (244) is tensioned and sleeved on the two pulleys (243).

2. A processing technology for a high-performance heat-resistant connecting hose, characterized in that, The processing equipment described in claim 1 includes the following steps: S1, Injection molding: The raw material is heated and melted by the injection molding machine body (1) and injected into the mold. After being extruded at high temperature, a hose blank is formed. S2, Cooling treatment: When the hose blank comes out of the discharge port of the injection molding machine body (1), it immediately enters the cooling jacket (22). One end of the hose blank passes through the cooling jacket (22) to form the finished hose. S3, Cooling cycle: During the cooling process, the cooling cycle component (25) is connected to the cooling jacket (22). Every certain period of time, the cooling cycle component (25) cools down the liquid carbon dioxide in the cooling jacket (22), so that the liquid carbon dioxide can maintain a low temperature during the cycle.

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