Fireproof controllable battery pack structure

Abstract

This invention relates to the technical field of battery structures, and in particular to a fire-resistant and controllable battery pack structure, comprising a housing, a mesh box disposed within the housing, a box cover that cooperates with the mesh box, and a shell cover that cooperates with the housing. The mesh box has several mounting chambers for placing battery packs, and each mounting chamber has an opening and closing structure for connecting the battery packs to a circuit. By placing each battery pack in an independent mounting chamber, several battery packs can be separated, thereby preventing the high-temperature spray or flame from damaging one battery pack from being transferred to other battery packs. This facilitates the protection of each battery pack, avoids chain reactions, and helps control the damage within a small area. Simultaneously, the opening and closing structure allows for power disconnection of damaged battery packs, preventing voltage and current surges caused by that battery pack from damaging other battery packs, thus facilitating the protection of the entire circuit.

Description

Technical Field

[0001] This invention relates to the technical field of battery structures, and in particular to a fire-resistant and controllable battery pack structure. Background Technology

[0002] As the core integrated unit of modern electrochemical energy storage systems, battery packs are widely used in many fields such as industrial automation, automobiles, and coal mining. The internal structure of a battery pack typically consists of battery modules, structural frames, electrical buses, insulating materials, and electronic control units, and is designed to provide stable and efficient power output for applications such as electric vehicles and energy storage power stations.

[0003] In traditional battery pack designs, multiple battery packs or modules are typically installed side-by-side in the same sealed housing, lacking effective physical and electrical isolation barriers between them. While this integration method is structurally simple, it presents significant safety hazards and system reliability issues. When a battery pack experiences thermal runaway due to a short circuit, overcharging, or other reasons, the resulting high-temperature ejecta and flames can easily spread rapidly to adjacent battery packs through shared spaces or connecting channels, triggering a chain reaction that leads to the propagation of thermal runaway and even open flame combustion. Simultaneously, voltage drops or short circuits caused by faulty battery packs can also disrupt the stability of the overall electrical circuit, resulting in abnormal output or even complete failure of the entire battery pack. Furthermore, due to the tight coupling between battery packs, a single fault can render the entire battery pack inoperable, requiring complete disassembly, repair, or replacement, resulting in high maintenance costs and resource waste. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a fire-resistant and controllable battery pack structure, the specific technical solution of which is as follows: The present invention provides a fireproof and controllable battery pack structure, comprising a housing, a mesh box disposed within the housing, a box cover used in conjunction with the mesh box, and a shell cover used in conjunction with the housing. The mesh box is provided with a plurality of mounting chambers for placing the battery pack, and the mounting chambers are provided with an opening and closing structure for connecting the battery pack to a circuit. The opening and closing structure includes a rotating column rotatably disposed in the installation chamber, two conductive bodies inserted through the rotating column, two contact points one corresponding to one end of the two conductive bodies, two contact points two corresponding to the other end of the two conductive bodies, and a drive unit for controlling the rotation of the rotating column. The contact points one are connected to a circuit, and the contact points two are electrically connected to the battery pack. A conductive long plate is disposed on the outer wall of the rotating column, which is offset from the conductive bodies. The conductive long plate is used to connect to the two contact points one.

[0005] Furthermore, the driving unit includes several spiral grooves formed on the outer wall of the rotating column, a movable sleeve that is laterally slidably sleeved on the rotating column, a magnetic suction plate set on the movable sleeve, and an electromagnet core that cooperates with the magnetic suction plate. The inner wall of the movable sleeve is provided with protrusions that cooperate with the spiral grooves. Two wires are wound on the electromagnet core, which are respectively connected to the positive and negative circuits of the circuit, and the winding directions of the two wires are opposite.

[0006] Furthermore, the opening and closing structure also includes a sliding plate that slides vertically on the inner wall of the mounting chamber. The sliding plate has a V-shaped groove, and a guide post is slidably disposed in the V-shaped groove. The guide post is connected to the movable sleeve, and the sliding plate is connected to the mounting chamber through an elastic body.

[0007] Furthermore, the mesh box has a heat exchange chamber for storing heat exchange fluid, and the shell is provided with several heat dissipation units that communicate with the heat exchange chamber and are used to dissipate heat from the heat exchange fluid.

[0008] Furthermore, the installation chamber has an opening that communicates with the heat exchange chamber, and the opening is covered with a cover plate. The heat exchange fluid in the heat exchange chamber flows into the installation chamber through the opening and fully covers the battery pack.

[0009] Furthermore, a transmission plate is provided on the cover plate, the transmission plate is slidably disposed on the inner wall of the installation chamber, and a transmission wheel is provided on the rotating column to cooperate with the transmission plate.

[0010] Furthermore, the installation chamber is equipped with a protective cover for sealing the opening and closing structure.

[0011] Furthermore, the heat dissipation unit includes a heat exchange cylinder vertically disposed inside the housing, the bottom of the heat exchange cylinder penetrating the housing, an exhaust pipe being connected to the side wall of the heat exchange cylinder, and the end of the exhaust pipe extending to the outside of the housing; The heat exchange cylinder is provided with a first guide cylinder and a second guide cylinder. The first guide cylinder and the second guide cylinder form a closed chamber. The first guide cylinder and the second guide cylinder can be extended and retracted relative to each other. The second guide cylinder is fixed on the heat exchange cylinder. The first guide cylinder is slidable on the heat exchange cylinder. Both the first guide cylinder and the second guide cylinder are in communication with the heat exchange chamber. The first guide tube and the second guide tube are connected by a spring.

[0012] The beneficial effects of this invention are as follows: By placing each battery pack in an independent mounting chamber, several battery packs can be separated, thus preventing the high-temperature spray or flames from one battery pack from being transferred to other battery packs when it is damaged. This facilitates the protection of each battery pack, avoids chain reactions, and helps to control the damage within a small area. At the same time, the opening and closing structure allows for power disconnection of the damaged battery pack, thereby preventing voltage and current surges caused by that battery pack from damaging other battery packs. This facilitates the protection of the entire circuit while ensuring that other battery packs can still operate normally. This allows the battery pack to continue to be used normally for a short period of time, improving its range in the event of a failure. Moreover, this structure allows for repairs to be performed only on the faulty battery pack, effectively reducing maintenance costs and resource consumption. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of a fire-resistant and controllable battery pack structure. Figure 2 This is a schematic diagram of the shell structure from below; Figure 3 This is a schematic diagram of the grid box structure; Figure 4 This is a sectional view of the installation room. Figure 5 for Figure 4 A schematic diagram of the internal structure of the inner protective cover; Figure 6 for Figure 5 A schematic diagram of the exploded structure; Figure 7 for Figure 5 Schematic diagram of the cross-sectional structure of the transfer column; Figure 8 for Figure 1 Schematic diagram of the heat dissipation unit; Figure label: 1. Shell; 2. Grid box; 3. Box cover; 4. Shell cover; 5. Mounting chamber; 6. Battery pack; 7. Rotating column; 8. Conductor; 9. Conductive long plate; 10. Contact one; 11. Contact two; 12. Spiral groove; 13. Moving sleeve; 14. Magnetic suction plate; 15. Electromagnetic core; 16. Slide plate; 17. V-groove; 18. Guide column; 19. Elastomer; 20. Heat exchange chamber; 21. Heat dissipation unit; 22. Cover plate; 23. Transmission plate; 24. Transmission wheel; 25. Protective cover; 26. Heat exchange cylinder; 27. Exhaust pipe; 28. Flow guide cylinder one; 29. ​​Flow guide cylinder two. Detailed Implementation

[0015] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0016] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0017] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. This embodiment is written in a progressive manner.

[0018] like Figures 1 to 8 As shown, a fireproof and controllable battery pack structure of the present invention includes a housing 1, a mesh box 2 disposed in the housing 1, a box cover 3 used in conjunction with the mesh box 2, and a shell cover 4 used in conjunction with the housing 1. The mesh box 2 is provided with a plurality of mounting chambers 5 for placing battery packs 6, and the mounting chambers 5 are provided with opening and closing structures for connecting battery packs 6 to the circuit. The opening and closing structure includes a rotating column 7 rotatably disposed in the mounting chamber 5, two conductive bodies 8 inserted on the rotating column 7, two contacts 10 corresponding to one end of the two conductive bodies 8, two contacts 21 corresponding to the other end of the two conductive bodies 8, and a drive unit for controlling the rotation of the rotating column 7. Contacts 10 are connected to the circuit, and contacts 21 are electrically connected to the battery pack 6. A conductive plate 9 is disposed on the outer wall of the rotating column 7, which is offset from the conductive bodies 8. The conductive plate 9 is used to connect to the two contacts 10.

[0019] In this invention, the mounting chambers 5 on the grid box 2 can provide independent mounting spaces for multiple battery packs 6. This partitioned design avoids mutual interference between battery packs 6 and facilitates independent protection for each battery pack 6. The box cover 3 can be installed on the grid box 2 to seal the mounting chambers 5, and the shell cover 4 can be installed on the shell 1 to form a single integrated structure for the battery pack. The conductor 8 on the rotating post 7 can pass through the rotating post 7 radially, and the rotating post 7 and the conductor 8 are relatively fixed. Thus, when the conductor... When the two ends of the conductor 8 are in contact with contact 10 and contact 21 respectively, contact 10 and contact 21 can be electrically connected through the conductor 8. When the conductor 8 rotates and its two ends are separated from contact 10 and contact 21, contact 10 and contact 21 are in an open state. In the circumferential direction of the rotating column 7, the conductive plate 9 is located between the two ends of the conductor 8 and is offset from the conductor 8. The conductive plate 9 has a large length in the axial direction of the rotating column 7, and it can contact both contact 10 at the same time.

[0020] In use, several battery packs 6 are connected in parallel or series in the circuit within the battery pack. At this time, the two ends of the conductor 8 are connected to the corresponding contacts 10 and 11, and the two ends of the battery pack 6 are connected to the two contacts 11. When the battery pack 6 is overloaded or damaged, the rotating column 7 can be controlled to rotate by the drive unit. At this time, the rotating column 7 can drive the two conductors 8 and the conductive plate 9 to rotate. The two conductors 8 are separated from the contacts 10 and 11 respectively. At the same time, the conductive plate 9 rotates onto the two contacts 10. At this time, the contacts 10 and 11 are in an open state. The two contacts 10 are connected through the conductive plate 9. The damaged battery pack 6 is no longer connected to the circuit, while the other battery packs 6 can still work normally. Furthermore, the separate isolation of the battery pack 6 by the mounting chamber 5 can prevent it from damaging other battery packs 6.

[0021] By placing each battery pack 6 in an independent mounting chamber 5, several battery packs 6 can be separated, thus preventing the high-temperature spray or flames on a damaged battery pack 6 from being transferred to other battery packs 6. This facilitates the protection of each battery pack 6, avoids chain reactions, and helps to control the damage within a small area. At the same time, the opening and closing structure allows for power disconnection of the damaged battery pack 6, thereby preventing voltage and current surges caused by that battery pack 6 from damaging other battery packs 6. This facilitates the protection of the entire circuit while ensuring that other battery packs 6 can still operate normally. This allows the battery pack to continue to be used normally for a short period of time, improving its range in the event of a failure. Moreover, this structure allows for repairs to be performed only on the faulty battery pack 6, effectively reducing maintenance costs and resource consumption.

[0022] Furthermore, the drive unit includes several spiral grooves 12 formed on the outer wall of the rotating column 7, a movable sleeve 13 that is laterally slidably sleeved on the rotating column 7, a magnetic suction plate 14 set on the movable sleeve 13, and an electromagnet core 15 that cooperates with the magnetic suction plate 14. The inner wall of the movable sleeve 13 is provided with protrusions that cooperate with the spiral grooves 12. Two wires that are respectively connected to the positive and negative circuits of the circuit are wound on the electromagnet core 15, and the winding directions of the two wires are opposite.

[0023] The movable sleeve 13 can slide laterally on the rotating column 7. To ensure proper cooperation between the movable sleeve 13 and the spiral groove 12, the movable sleeve 13 only slides on the spiral groove 12 and cannot rotate. The two wires on the electromagnet core 15 are arranged so that, when energized, the magnetic fields generated by the two wires on the electromagnet core 15 cancel each other out. At this time, there is no interaction force between the electromagnet core 15 and the magnetic suction plate 14. However, when the battery pack 6 is damaged and the current output by the battery pack 6 suddenly increases or decreases, the current in one of the two wires will... When the current changes, the magnetic fields generated by the two conductors differ, and the electromagnet core 15 generates magnetic force. The electromagnet core 15 attracts the magnetic plate 14 and pulls the movable sleeve 13 to move on the rotating column 7. The movable sleeve 13 drives the rotating column 7 to rotate using the protrusions and spiral grooves 12, thereby swapping the positions of the conductor 8 and the conductive plate 9. Using the above structure, as long as the current in either of the two conductors on the electromagnet core 15 changes, the magnetic fields generated by the two conductors cannot cancel each other out, thus enabling power-off handling in various dangerous situations.

[0024] Furthermore, the opening and closing structure also includes a sliding plate 16 that slides vertically on the inner wall of the installation chamber 5. A V-shaped groove 17 is provided on the sliding plate 16, and a guide post 18 is slidably arranged in the V-shaped groove 17. The guide post 18 is connected to the movable sleeve 13, and the sliding plate 16 is connected to the installation chamber 5 through an elastic body 19.

[0025] The slide plate 16 can slide vertically on the inner wall of the mounting chamber 5, and the elastic body 19 can provide elasticity to the slide plate 16. Figure 6 For example, the elastic body 19 provides a downward elastic thrust to the slide plate 16, the opening of the V-groove 17 faces upward, and the V-groove 17 can guide the guide post 18, preventing the guide post 18 and the moving sleeve 13 from rotating; using the elastic force provided by the elastic body 19 to the slide plate 16, the guide post 18 can be stopped at one end of the V-groove 17, at which time the position of the moving sleeve 13 is fixed. When the electromagnet core 15 generates an instantaneous attraction force on the magnetic plate 14 and causes the moving sleeve 13 and the magnetic plate 14 to move on the rotating column 7, the moving sleeve 13 can, due to inertia, The slide plate 16 is pushed upward by the V-groove 17 and the guide post 18, and the elastic body 19 undergoes elastic deformation. When the moving sleeve 13 passes the lowest point of the V-groove 17, the elastic deformation of the elastic body 19 reaches its maximum. Then, the elastic thrust of the elastic body 19 on the slide plate 16 can assist the guide post 18 to move to the other end of the V-groove 17, thereby allowing the guide post 18 to move between the two ends of the V-groove 17. The slide plate 16 and the V-groove 17 lock the position of the guide post 18 again. At this time, the moving sleeve 13 completes the lateral movement on the rotating post 7.

[0026] Furthermore, the mesh box 2 has a heat exchange chamber 20 for storing heat exchange fluid, and the shell 1 has several heat dissipation units 21 that communicate with the heat exchange chamber 20 and are used to dissipate heat from the heat exchange fluid.

[0027] The heat exchange fluid in the heat exchange chamber 20 can be used to exchange heat with the battery pack 6 in each installation chamber 5, thereby cooling the battery pack 6 and ensuring that the battery pack 6 can operate normally at a stable temperature. The heat dissipation unit 21 can cool and dissipate heat from the heat exchange fluid that has completed the heat exchange, thereby reducing the temperature of the heat exchange fluid.

[0028] Furthermore, the installation chamber 5 has an opening that communicates with the heat exchange chamber 20, and a cover plate 22 is provided on the opening. The heat exchange fluid in the heat exchange chamber 20 flows into the installation chamber 5 through the opening and fully covers the battery pack 6.

[0029] When the battery pack 6 is damaged, the cover plate 22 opens, and part of the heat exchange fluid in the heat exchange chamber 20 flows into the installation chamber 5 through the opening. This allows the heat exchange fluid to fully cover the damaged battery pack 6, facilitating isolation and direct cooling of the battery pack 6 and preventing dangerous accidents such as explosions.

[0030] The heat exchange fluid can be battery coolant, deionized water, water-based solutions containing flame retardants, etc.

[0031] Furthermore, a transmission plate 23 is provided on the cover plate 22, and the transmission plate 23 is slidably disposed on the inner wall of the installation chamber 5. A transmission wheel 24 is provided on the rotating column 7 to cooperate with the transmission plate 23.

[0032] In its natural state, the cover plate 22 remains in a blocking state on the opening. When the battery pack 6 is damaged and the rotating column 7 rotates, the rotating column 7 can drive the transmission plate 23 to move through the transmission wheel 24. The transmission plate 23 drives the cover plate 22 to move, and the cover plate 22 stops blocking the opening, thereby allowing the heat exchange fluid to enter the installation chamber 5.

[0033] It should be noted that, in order to avoid the air pressure in the sealed installation chamber 5 from interfering with the entry of the heat exchange fluid, a vent can be opened on the cover 3 corresponding to the installation chamber 5 to facilitate the timely discharge of gas. In order to prevent the heat exchange fluid from being discharged through the vent, a float can be installed on the vent. The buoyancy of the heat exchange fluid on the float can be used to block the vent. In this way, when the battery pack 6 is being maintained, the heat exchange fluid can be allowed to re-enter the heat exchange chamber 20 through the opening, while external gas can be replenished into the installation chamber 5 through the vent.

[0034] Furthermore, the installation chamber 5 is equipped with a protective cover 25 for sealing the opening and closing structure.

[0035] Since the heat exchange fluid can be filled in the installation chamber 5, the opening and closing structure can be isolated by the protective cover 25 to avoid direct contact between the heat exchange fluid and the opening and closing structure. The end of the rotating column 7 can pass through the protective cover 25 and extend out, and the drive wheel 24 is located outside the protective cover 25.

[0036] Furthermore, the heat dissipation unit 21 includes a heat exchange cylinder 26 vertically disposed inside the housing 1. The bottom of the heat exchange cylinder 26 penetrates the housing 1, and an exhaust pipe 27 is connected to the side wall of the heat exchange cylinder 26. The end of the exhaust pipe 27 extends to the outside of the housing 1. The heat exchange cylinder 26 is provided with a first guide tube 28 and a second guide tube 29. The first guide tube 28 and the second guide tube 29 form a closed chamber, and the first guide tube 28 and the second guide tube 29 can be extended and retracted relative to each other. The second guide tube 29 is fixed on the heat exchange cylinder 26, and the first guide tube 28 can be slidably disposed on the heat exchange cylinder 26. Both the first guide tube 28 and the second guide tube 29 are connected to the heat exchange chamber 20. The first guide tube 28 and the second guide tube 29 are connected by a spring.

[0037] The heat exchange fluid in the heat exchange chamber 20 can enter the first guide tube 28 and the second guide tube 29. External gas can enter the heat exchange tube 26 from the bottom. At this time, the gas in the heat exchange tube 26 can exchange heat with the heat exchange fluid in the first guide tube 28 and the second guide tube 29, thereby cooling the heat exchange fluid. The high-temperature gas in the heat exchange tube 26 naturally rises and is discharged through the exhaust pipe 27, thus achieving the effect of automatic air intake and heat exchange. At the same time, the lower-temperature heat exchange fluid in the second guide tube 29 will naturally flow downward and then flow back into the heat exchange chamber 20 through the first guide tube 28, thus achieving the automatic flow of the heat exchange fluid.

[0038] When the cover plate 22 in one of the installation chambers 5 is opened, the first guide tube 28 and the second guide tube 29 are connected by a spring, so the first guide tube 28 can move toward the second guide tube 29, and the heat exchange fluid between the first guide tube 28 and the second guide tube 29 can be squeezed into the installation chamber 5; since the first guide tube 28 can move, it can be connected to the heat exchange chamber 20 through a hose.

[0039] In some embodiments, in order to make the plurality of heat dissipation units 21 move synchronously, a connecting rod structure connecting the plurality of guide tubes 28 can be provided in the housing 1, and bolts or other locking structures can be provided on the connecting rod structure to facilitate locking the position of the guide tubes 28, which facilitates maintenance of the battery pack 6 in the installation chamber 5.

[0040] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A fireproof controllable battery pack structure, characterized in that, The device includes a housing, a mesh box disposed within the housing, a box cover that cooperates with the mesh box, and a shell cover that cooperates with the housing. The mesh box is provided with a plurality of mounting chambers for placing battery packs, and each mounting chamber is provided with an opening and closing structure for connecting the battery packs to a circuit. The opening and closing structure includes a rotating column rotatably disposed in the installation chamber, two conductive bodies inserted through the rotating column, two contact points one corresponding to one end of the two conductive bodies, two contact points two corresponding to the other end of the two conductive bodies, and a drive unit for controlling the rotation of the rotating column. The contact points one are connected to a circuit, and the contact points two are electrically connected to the battery pack. A conductive long plate is disposed on the outer wall of the rotating column, which is offset from the conductive bodies. The conductive long plate is used to connect to the two contact points one.

2. The fireproof controllable battery pack structure according to claim 1, characterized in that, The driving unit includes several spiral grooves formed on the outer wall of the rotating column, a movable sleeve that is laterally slidably sleeved on the rotating column, a magnetic suction plate set on the movable sleeve, and an electromagnet core that cooperates with the magnetic suction plate. The inner wall of the movable sleeve is provided with protrusions that cooperate with the spiral grooves. Two wires are wound on the electromagnet core, which are respectively connected to the positive and negative circuits of the circuit, and the winding directions of the two wires are opposite.

3. The fire-resistant and controllable battery pack structure according to claim 2, characterized in that, The opening and closing structure also includes a sliding plate that slides vertically on the inner wall of the installation chamber. The sliding plate has a V-shaped groove, and a guide post is slidably disposed in the V-shaped groove. The guide post is connected to the movable sleeve, and the sliding plate is connected to the installation chamber through an elastic body.

4. The fire-resistant and controllable battery pack structure according to claim 1, characterized in that, The mesh box has a heat exchange chamber for storing heat exchange fluid, and the shell has several heat dissipation units that communicate with the heat exchange chamber and are used to dissipate heat from the heat exchange fluid.

5. The fire-resistant and controllable battery pack structure according to claim 4, characterized in that, The installation chamber has an opening that communicates with the heat exchange chamber. The opening is covered with a cover plate. The heat exchange fluid in the heat exchange chamber flows into the installation chamber through the opening and fully covers the battery pack.

6. The fire-resistant and controllable battery pack structure according to claim 5, characterized in that, A transmission plate is provided on the cover plate, and the transmission plate is slidably disposed on the inner wall of the installation chamber. A transmission wheel that cooperates with the transmission plate is provided on the rotating column.

7. The fire-resistant and controllable battery pack structure according to claim 1, characterized in that, The installation chamber is equipped with a protective cover for sealing the opening and closing structure.

8. The fire-resistant and controllable battery pack structure according to claim 4, characterized in that, The heat dissipation unit includes a heat exchange cylinder vertically disposed inside the housing. The bottom of the heat exchange cylinder penetrates the housing. An exhaust pipe is connected to the side wall of the heat exchange cylinder, and the end of the exhaust pipe extends to the outside of the housing. The heat exchange cylinder is provided with a first guide cylinder and a second guide cylinder. The first guide cylinder and the second guide cylinder form a closed chamber. The first guide cylinder and the second guide cylinder can be extended and retracted relative to each other. The second guide cylinder is fixed on the heat exchange cylinder. The first guide cylinder is slidable on the heat exchange cylinder. Both the first guide cylinder and the second guide cylinder are in communication with the heat exchange chamber. The first guide tube and the second guide tube are connected by a spring.

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