Low temperature drying device for processing sepiolite hemostatic material

Abstract

The utility model relates to the sea sponge hemostatic material processing technical field, concretely for the utility model discloses a kind of low-temperature drying device for sea sponge hemostatic material processing, including drying cabinet, two groups of conveying rollers are symmetrically arranged in drying cabinet, and conveying motor is arranged in cooperation with conveying roller, conveying belt is sleeved between two groups of conveying rollers, a plurality of heating rollers are arranged in drying cabinet, heating roller is installed in drying cabinet by bearing, and top end and the upper band surface bottom end of conveying belt are slidably attached, heating cavity is arranged in the inside of heating roller, and the both ends of heating cavity extend outward and are provided with connecting groove, connecting pipe is arranged between adjacent two heating rollers, and connecting pipe and corresponding connecting groove are connected by sealing bearing, the utility model can improve the drying uniformity effect when sea sponge hemostatic material processing, improve drying performance.

Description

Technical Field

[0001] This utility model relates to the field of sepiolite hemostatic material processing technology, specifically a low-temperature drying device for processing sepiolite hemostatic materials. Background Technology

[0002] Sepiolite, as a natural mineral material, has important application value in the field of hemostatic materials due to its excellent adsorption and biocompatibility.

[0003] In the production and processing of sepiolite hemostatic materials, the powder needs to be mixed with liquid additives (such as hemostatic active liquid) and then dried. The drying process has a significant impact on material properties. Traditional drying equipment often uses high-temperature stirring or hot air circulation for drying, which has the following drawbacks: First, high temperatures can easily damage the fibrous structure of sepiolite, leading to a decrease in its hemostatic properties; Secondly, it consumes a lot of energy and the drying uniformity of materials is poor, resulting in poor continuous operation. In addition, the existing equipment lacks continuous cleaning functions, and residual materials on the conveyor belt are prone to cross-contamination, affecting the stability of product quality.

[0004] Currently, some improvement solutions optimize the drying effect by increasing the uniformity of hot air distribution, but problems such as poor uniformity of contact between the heating medium and the material and low thermal energy utilization still exist. Utility Model Content

[0005] The purpose of this invention is to provide a low-temperature drying device for processing sepiolite hemostatic materials, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a low-temperature drying device for processing sepiolite hemostatic materials, comprising a drying chamber, two sets of conveying rollers symmetrically arranged inside the drying chamber, and a conveying motor configured in conjunction with the conveying rollers. A conveyor belt is sleeved between the two sets of conveying rollers. Multiple heating rollers are arranged inside the drying chamber, and the heating rollers are mounted inside the drying chamber via bearings, with their top ends slidingly attached to the bottom end of the upper surface of the conveyor belt. A heating cavity is formed inside each heating roller, and connecting grooves extend outward from both ends of the heating cavity. A connecting pipe is provided between two adjacent heating rollers, and the connecting pipe is connected to the corresponding connecting groove via a sealed bearing. In this way, a low-temperature heating medium can be input into or output to the corresponding heating cavity through the cooperation of the connecting pipe and the connecting groove, allowing the low-temperature heating medium to flow in the corresponding heating cavity. At the same time, the cooperation of the sealed bearings ensures the rotational installation of the heating rollers and reduces friction with the conveyor belt.

[0007] This invention is further configured such that the heating rollers are arranged in multiple groups, and each group of heating rollers is sequentially connected by connecting pipes to form a serpentine conveying channel. The inlet end of the serpentine conveying channel is provided with an inlet pipe, and the outlet end is provided with an outlet pipe. By arranging the heating rollers in multiple groups, the drying temperature of each group can be set in stages. In this way, the appropriate temperature drying medium can be selected according to the drying stage of the sepiolite hemostatic material, thereby improving the utilization of heat energy and improving the drying performance of the sepiolite hemostatic material. The low-temperature drying medium is transported to the corresponding heating roller through the inlet pipe and flows in the heating roller. Then, under the action of the connecting pipe, it is transported to the next heating roller, and flows sequentially, realizing the circulation of the low-temperature heating medium among multiple heating rollers in the same group, thereby heating the conveyor belt and realizing the low-temperature drying of the sepiolite hemostatic material located on the conveyor belt.

[0008] The present invention is further configured such that a feed pipe is provided at the top of the drying chamber, and a cloth box is provided at the bottom of the feed pipe. Multiple cloth spray nozzles are evenly arranged at the bottom of the cloth box. The sepiolite hemostatic material to be dried is conveyed into the drying chamber through the feed pipe and enters the cloth box. The cloth box evenly distributes the material to the cloth spray nozzles, and the cloth spray nozzles evenly spray it onto the conveyor belt, so as to achieve the flattening of the sepiolite hemostatic material on the conveyor belt, so as to ensure uniform drying and improve the consistency and stability of the drying effect.

[0009] The present invention is further configured such that a discharge pipe is provided at the tail end of the drying chamber, and a guide scraper is provided between the top end of the discharge pipe and the lower surface of the conveyor belt at the tail end. After drying is completed, as the conveyor belt is conveyed, the sepiolite raw material will fall down to the discharge pipe at the tail end. Some of the adhering sepiolite material will be scraped off from the conveyor belt under the action of the guide scraper and guided to the discharge pipe to be discharged from the drying chamber for the next processing operation.

[0010] This invention is further configured such that, from back to front, a cleaning spray pipe, a cleaning scraper, and a hot air drying pipe are sequentially arranged at the bottom of the drying chamber, below the conveyor belt. Multiple high-pressure nozzles are evenly arranged on the cleaning spray pipe, and the input end of the cleaning spray pipe is connected to a cleaning liquid source. The input end of the hot air drying pipe is connected to a drying and clean hot air source. A drain assembly is provided at the bottom of the drying chamber. After the dried sepiolite material is unloaded from the conveyor belt, the conveyor belt surface can be washed and cleaned sequentially through the cleaning spray pipe and the high-pressure nozzles. After cleaning, excess residual moisture can be scraped off in time by the cleaning scraper, and the scraped moisture is guided to the collection hopper in the drain assembly for collection. After scraping by the cleaning scraper, there is less residual moisture on the surface of the conveyor belt, and hot air can be evenly blown out by the subsequent hot air drying pipe to dry the surface of the conveyor belt. This achieves automatic cleaning of the conveyor belt. Here, the temperature of the hot air used for drying is matched with the temperature used for drying the sepiolite to avoid the conveyor belt temperature from becoming too high.

[0011] The present invention is further configured such that the sewage discharge component includes a collection hopper, which is located at the bottom of the drying chamber. A sewage discharge pipe is provided at the bottom of the collection hopper, and a valve is provided on the sewage discharge pipe. The sewage generated during the conveyor belt cleaning process can be collected by the collection hopper and discharged in a timely manner through the sewage discharge pipe. In this way, the automatic cleaning of the conveyor belt can be achieved after the sepiolite is dried and unloaded.

[0012] The present invention is further configured such that a vacuum tube is provided at the top of the drying box, and a negative pressure vacuum device is connected to the vacuum tube. The generated hot water and moisture are extracted outward in a timely manner through the vacuum tube. The vacuum tube can be used in conjunction with an existing heat exchanger through the external negative pressure vacuum device to realize the heat exchange and utilization of waste heat in water vapor.

[0013] The present invention is further configured such that a protective cover is provided on the outside of the drying chamber, the protective cover is fitted on the outside of the connecting pipe, and heat insulation cotton is provided inside the protective cover. Both the liquid inlet pipe and the liquid outlet pipe extend to the outside of the protective cover. The combination of the protective cover and the heat insulation cotton can improve the heat insulation and protection effect at the connecting pipe and reduce the heat loss of the low-temperature heating medium during transportation. Preferably, the protective cover and the drying chamber are fixed with bolts to facilitate subsequent disassembly and maintenance.

[0014] Compared with the prior art, the beneficial effects of this utility model are: 1. This invention utilizes a serpentine arrangement of multiple heating rollers and connecting pipes to achieve stepped temperature control of the low-temperature heating medium, while extending the medium's flow path and time, thus improving heat energy utilization. Each heating roller can independently adjust the medium temperature, ensuring that the sepiolite hemostatic material is matched with the optimal heating temperature at different drying stages, avoiding localized overheating or uneven drying. Heat energy is directly conducted to the conveyor belt through the heating rollers, and combined with the vacuum pipe for rapid moisture removal, significantly improving drying efficiency while reducing energy consumption. This design is particularly suitable for temperature-sensitive sepiolite materials, ensuring that their hemostatic performance is not damaged by high temperatures. Furthermore, this invention installs the connecting pipes on the outside of the drying chamber, facilitating flexible installation, disassembly, and maintenance.

[0015] 2. Automated cleaning and continuous production This invention integrates a cleaning nozzle, scraper, and hot air drying pipe beneath the conveyor belt, forming a closed-loop cleaning system. After drying, a high-pressure jet washes away residual material, the scraper removes moisture, and hot air quickly dries the conveyor belt, all without manual intervention. A wastewater collection system centrally collects wastewater, and valves control discharge, ensuring cleaning efficiency. This design not only extends the conveyor belt's lifespan but also enables continuous production, reducing downtime.

[0016] 3. This utility model, through the combination of a fabric distribution box and multiple fabric nozzles, allows for the even spreading of sepiolite slurry on the conveyor belt, preventing accumulation or uneven thickness. The sliding contact design between the heating roller and the conveyor belt ensures uniform heat transfer, while protective covers and insulation cotton reduce heat loss. The vacuum system accelerates moisture evaporation, and the flexible configuration of multiple temperature ranges adapts to the material's characteristics. The overall structure is compact, and the environment inside the drying chamber is controllable, significantly improving the consistency and stability of product quality. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a low-temperature drying device for processing sepiolite hemostatic materials according to this utility model. Figure 2 This is a schematic diagram of the structure of the present invention when the protective cover is completely removed; Figure 3 This is a cross-sectional view of the overall internal structure of this utility model; Figure 4 This is a schematic diagram of the cooperation structure between the heating rollers in this utility model; Figure 5 This is a schematic diagram of the connection structure between the feed pipe, the fabric box, and the fabric nozzle in this utility model; Figure 6 This is a cross-sectional schematic diagram of the connection structure between the heating roller and the connecting pipe in this utility model; Figure 7 This is a cross-sectional schematic diagram of the connection structure between the protective cover and the insulation cotton in this utility model.

[0018] The components represented by each number in the attached diagram are listed below: 1. Drying chamber; 2. Conveyor roller; 3. Conveyor motor; 4. Conveyor belt; 5. Heating roller; 6. Heating chamber; 7. Connecting groove; 8. Connecting pipe; 9. Liquid inlet pipe; 10. Liquid outlet pipe; 11. Feed inlet pipe; 12. Fabric box; 13. Fabric nozzle; 14. Discharge pipe; 15. Guide scraper; 16. Cleaning spray pipe; 17. Cleaning scraper; 18. Hot air drying pipe; 19. High-pressure punch; 20. Collection hopper; 21. Sewage pipe; 22. Valve; 23. Vacuum pipe; 24. Protective cover; 25. Insulation cotton. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This utility model provides a technical solution: Please refer to Figures 1-7 A low-temperature drying device for processing sepiolite hemostatic materials includes a drying chamber 1. Two sets of conveying rollers 2 are symmetrically arranged inside the drying chamber 1, and a conveying motor 3 is provided in conjunction with the conveying rollers 2. A conveyor belt 4 is sleeved between the two sets of conveying rollers 2. Multiple heating rollers 5 are provided inside the drying chamber 1. The heating rollers 5 are installed in the drying chamber 1 through bearings, and their top ends slide against the bottom end of the upper surface of the conveyor belt 4. A heating cavity 6 is opened inside the heating roller 5. The internal shape of the heating cavity 6 is not limited and can be a spiral, Z-shaped, straight, or other styles. A spiral structure is preferred to extend the medium flow path. The heating chamber 6 has connecting grooves 7 extending outward from both ends. A connecting pipe 8 is provided between two adjacent heating rollers 5. The connecting pipe 8 is connected to the corresponding connecting groove 7 through a sealed bearing. In this way, the low-temperature heating medium can be input into or output to the corresponding heating chamber 6 through the cooperation of the connecting pipe 8 and the connecting groove 7, so that the low-temperature heating medium can flow in the corresponding heating chamber 6. At the same time, the cooperation of the sealed bearing can ensure the rotational installation of the heating roller 5, reduce the friction between it and the conveyor belt 4, maintain the fit between it and the conveyor belt 4, and improve the heating uniformity of the conveyor belt 4.

[0021] In this invention, multiple sets of heating rollers 5 are provided. Each set of heating rollers 5 is connected sequentially by connecting pipes 8 to form a serpentine conveying channel. The liquid inlet end of the serpentine conveying channel is provided with a liquid inlet pipe 9, and the liquid outlet end is provided with a liquid outlet pipe 10. By providing multiple sets of heating rollers 5, the drying temperature of each set can vary in stages. Preferably, the temperature of the low-temperature heating medium introduced into each set of heating rollers 5 decreases in a gradient of 5-10℃. In this way, the appropriate temperature of the heating medium can be selected according to the drying stage of the sepiolite hemostatic material, thereby improving the utilization effect of heat energy and improving the drying performance of the sepiolite hemostatic material. The low-temperature drying medium is transported to the corresponding heating roller 5 through the liquid inlet pipe 9 and flows in the heating roller 5. Then, under the action of the connecting pipe 8, it is transported to the next heating roller 5. This sequential flow allows for sufficient heat exchange between multiple heating rollers 5 in the same group, thereby achieving uniform and stable heating of the conveyor belt 4, improving the efficiency of heat energy utilization, and thus realizing the low-temperature drying of the sepiolite hemostatic material located on the conveyor belt 4.

[0022] Please see Figures 1-7 As one embodiment of the drying chamber 1: The top of the drying chamber 1 is provided with a feed pipe 11, and the bottom of the feed pipe 11 is provided with a cloth box 12. The bottom of the cloth box 12 is evenly provided with multiple cloth spray nozzles 13. The sepiolite hemostatic material to be dried is conveyed into the drying chamber 1 through the feed pipe 11 and enters the cloth box 12. It is evenly distributed to the cloth spray nozzles 13 through the cloth box 12 and evenly sprayed onto the conveyor belt 4 through the cloth spray nozzles 13, so as to achieve the flattening of the sepiolite hemostatic material on the conveyor belt 4, so as to ensure uniform drying and improve the consistency and stability of the drying effect.

[0023] Please see Figures 1-7 As one embodiment of the drying chamber 1: a discharge pipe 14 is provided at the tail end of the drying chamber 1, and a guide scraper 15 is provided between the top end of the discharge pipe 14 and the lower surface of the conveyor belt 4. After drying is completed, as the conveyor belt 4 is conveyed, the sepiolite raw material will fall down to the discharge pipe 14 at the tail end. Some of the adhering sepiolite material will be scraped off from the conveyor belt 4 under the action of the guide scraper 15 and guided to the discharge pipe 14 to be discharged from the drying chamber 1 for the next processing operation.

[0024] Please see Figures 1-7As one embodiment of the drying chamber 1: At the bottom of the drying chamber 1, below the conveyor belt 4, a cleaning spray pipe 16, a cleaning scraper 17, and a hot air drying pipe 18 are arranged sequentially from back to front. Multiple high-pressure punches 19 are evenly arranged on the cleaning spray pipe 16, and the input end of the cleaning spray pipe 16 is connected to a cleaning liquid source. The input end of the hot air drying pipe 18 is connected to a drying and clean hot air source. A sewage discharge assembly is provided at the bottom of the drying chamber 1. After the dried sepiolite material is unloaded from the conveyor belt 4, the cleaning spray pipe 16 and the high-pressure punches 19 can sequentially work together to achieve the conveyor belt 4's... After rinsing and cleaning the surface, excess residual water can be scraped off in time by the cleaning scraper 17, and the scraped water can be guided to the collection hopper 20 in the sewage discharge component for collection. After the cleaning scraper 17 removes the water, there is little residual water on the surface of the conveyor belt 4, and hot air can be blown out evenly by the subsequent hot air drying pipe 18 to dry the surface of the conveyor belt 4. In this way, the automatic cleaning of the conveyor belt 4 can be achieved. Here, the temperature of the hot air used for drying is matched with the temperature used for drying sepiolite to avoid the conveyor belt 4 from getting too hot.

[0025] Please see Figures 1-7 As one implementation of the sewage discharge component: the sewage discharge component includes a collection hopper 20, which is located at the bottom of the drying chamber 1. A sewage discharge pipe 21 is provided at the bottom of the collection hopper 20, and a valve 22 is provided on the sewage discharge pipe 21. The sewage generated during the cleaning process of the conveyor belt 4 can be collected by the collection hopper 20 and discharged in a timely manner through the sewage discharge pipe 21. In this way, the automatic cleaning of the conveyor belt 4 can be achieved after the sepiolite is dried and unloaded.

[0026] Please see Figures 1-7 As one implementation of the drying oven 1: A vacuum tube 23 is provided at the top of the drying oven 1. The vacuum tube 23 is connected to a negative pressure vacuum device. The generated hot water is extracted out in time through the vacuum tube 23. The vacuum tube 23 can be used in conjunction with the existing heat exchanger through the external negative pressure vacuum device to realize the heat exchange and utilization of the waste heat in the water vapor.

[0027] Please see Figures 1-7 As one embodiment of the drying chamber 1: a protective cover 24 is provided on the outside of the drying chamber 1. The protective cover 24 is fitted on the outside of the connecting pipe 8. Insulation cotton 25 is provided inside the protective cover 24. The liquid inlet pipe 9 and the liquid outlet pipe 10 both extend to the outside of the protective cover 24. The combination of the protective cover 24 and the insulation cotton 25 can improve the heat preservation effect at the connecting pipe 8 and reduce the heat loss of the low-temperature heating medium during transportation. The protective cover 24 and the drying chamber 1 are preferably fixed with bolts to facilitate subsequent disassembly and maintenance.

[0028] In summary, the working principle and specific workflow of this utility model are as follows: In use, the sepiolite hemostatic material to be dried is conveyed to the drying box 1 through the feed pipe 11 and enters the cloth box 12. It is evenly distributed to the cloth spray nozzle 13 through the cloth box 12 and evenly sprayed onto the conveyor belt 4 through the cloth spray nozzle 13, so as to achieve the even spreading of the sepiolite hemostatic material on the conveyor belt 4. During this process, the conveyor motor 3 controls the conveyor roller 2 to drive the conveyor belt 4 to move evenly and stably, thereby driving the flattened sepiolite hemostatic material to move forward evenly and stably and to contact the heating roller 5 evenly. The low-temperature heating medium is transported to the corresponding heating roller 5 through the liquid inlet pipe 9 and flows in the heating roller 5. Then, under the action of the connecting pipe 8, it is transported to the next heating roller 5. This sequential flow realizes the circulation of the low-temperature heating medium among multiple heating rollers 5 in the same group, thereby realizing the heating of the conveyor belt 4 and thus realizing the low-temperature heating and drying of the sepiolite hemostatic material located on the conveyor belt 4. Simultaneously, the generated water vapor is promptly extracted outward through the vacuum tube 23 to improve the drying effect; This invention sets multiple sets of heating rollers 5, so that the temperature of the low-temperature heating medium conveyed in each set of heating rollers 5 varies in a stepwise manner. In this way, the appropriate temperature of the heating medium can be selected according to the drying stage of the sepiolite hemostatic material, thereby improving the utilization of heat energy and improving the drying performance and drying efficiency of the sepiolite hemostatic material. After drying is completed, the sepiolite raw material will fall down to the discharge pipe 14 at the tail end as it is conveyed by the conveyor belt 4. Some of the adhering sepiolite material will be scraped off from the conveyor belt 4 by the guide scraper 15 and guided to the discharge pipe 14 to be discharged from the drying box 1 for the next processing operation. After the dried sepiolite material is unloaded from the conveyor belt 4, the surface of the conveyor belt 4 can be washed and cleaned by the cleaning nozzle 16 and the high-pressure punch 19 in sequence. After cleaning is completed, excess residual water can be scraped off in time by the cleaning scraper 17, and the scraped water can be guided to the collection hopper 20 in the sewage discharge assembly for collection by the cleaning scraper 17. After being scraped off by the cleaning scraper 17, there is little residual moisture on the surface of the conveyor belt 4. Hot air can be blown out evenly through the subsequent hot air drying pipe 18 to achieve rapid drying of the surface of the conveyor belt 4. In this way, the automatic cleaning of the conveyor belt 4 can be achieved. Here, the temperature of the hot air used for drying is matched with the temperature used for drying sepiolite to avoid the conveyor belt 4 from getting too hot; Wastewater generated during cleaning will be collected in collection hopper 20 and discharged through drain pipe 21.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-temperature drying device for processing sepiolite hemostatic materials, comprising a drying oven (1), characterized in that: Two sets of conveyor rollers (2) are symmetrically arranged inside the drying box (1), and a conveyor motor (3) is provided in conjunction with the conveyor rollers (2). A conveyor belt (4) is sleeved between the two sets of conveyor rollers (2). Multiple heating rollers (5) are provided inside the drying box (1). The heating rollers (5) are installed in the drying box (1) through bearings, and their top ends slide against the bottom end of the upper belt surface of the conveyor belt (4). A heating cavity (6) is opened inside the heating roller (5). A connecting groove (7) is opened at both ends of the heating cavity (6). A connecting pipe (8) is provided between two adjacent heating rollers (5). The connecting pipe (8) is connected to the corresponding connecting groove (7) through a sealed bearing. The heating roller (5) is provided in multiple sets. Each set of heating rollers (5) is connected in sequence through connecting pipes (8) to form a serpentine conveying channel. The inlet end of the serpentine conveying channel is provided with an inlet pipe (9), and the outlet end is provided with an outlet pipe (10).

2. The low-temperature drying apparatus for processing sepiolite hemostatic materials according to claim 1, characterized in that: The top of the drying box (1) is provided with a feed pipe (11), the bottom of the feed pipe (11) is provided with a cloth box (12), and the bottom of the cloth box (12) is provided with a plurality of cloth nozzles (13).

3. The low-temperature drying apparatus for processing sepiolite hemostatic materials according to claim 1, characterized in that: The drying box (1) is provided with a discharge pipe (14) at the tail end, and a guide scraper (15) is provided between the top end of the discharge pipe (14) and the lower surface of the conveyor belt (4).

4. The low-temperature drying apparatus for processing sepiolite hemostatic materials according to claim 1, characterized in that: Inside the drying chamber (1), below the conveyor belt (4), a cleaning spray pipe (16), a cleaning scraper (17), and a hot air drying pipe (18) are arranged sequentially from back to front. Multiple high-pressure punches (19) are evenly arranged on the cleaning spray pipe (16), and the input end of the cleaning spray pipe (16) is connected to a cleaning liquid source. The input end of the hot air drying pipe (18) is connected to a drying and clean hot air source. A sewage discharge assembly is arranged at the bottom of the drying chamber (1).

5. A low-temperature drying apparatus for processing sepiolite hemostatic materials according to claim 4, characterized in that: The sewage discharge assembly includes a collection hopper (20), which is located at the bottom of the drying box (1). A sewage discharge pipe (21) is provided at the bottom of the collection hopper (20), and a valve (22) is provided on the sewage discharge pipe (21).

6. A low-temperature drying apparatus for processing sepiolite hemostatic materials according to claim 1, characterized in that: The top of the drying oven (1) is provided with a vacuum tube (23), which is connected to a negative pressure vacuum device.

7. A low-temperature drying apparatus for processing sepiolite hemostatic materials according to claim 1, characterized in that: The drying oven (1) is provided with a protective cover (24) on the outside. The protective cover (24) is fitted on the outside of the connecting pipe (8). The protective cover (24) is provided with heat insulation cotton (25), and the liquid inlet pipe (9) and liquid outlet pipe (10) both extend to the outside of the protective cover (24).

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