Vacuum steam tube for coffee machine and method for manufacturing the same

Abstract

This application discloses a vacuum steam pipe for a coffee machine and its manufacturing method. The steam pipe includes an inner pipe, an outer pipe, a first connecting mechanism, a second connecting mechanism, an inner pipe spacer mechanism, an inner pipe spacer elastic element, and a vacuum cavity. The vacuum cavity blocks heat conduction and convection, preventing burns during operation and reducing heat loss. Within the cavity, the inner pipe spacer mechanism and the inner pipe spacer elastic element form an array of flexible supports to absorb the thermal expansion displacement load of the inner pipe, prevent mechanical stress concentration at the end welding nodes, disperse torsional forces caused by external movement, reduce the risk of weld fatigue cracking, and maintain the structural stability and vacuum life of the pipe. The manufacturing method adopts a progressive coaxial assembly logic to prevent physical interference and misalignment of multiple pipe components. End sealing creates a sealed environment for evacuation and venting, ensuring the coaxiality of the pipe components and the airtightness of the ends, improving the continuity of the processing flow and the consistency of the finished product quality.

Description

Technical Field

[0001] This application relates to the field of energy-saving pipe fittings for coffee machines, and in particular to a vacuum steam pipe for a coffee machine and its manufacturing method. Background Technology

[0002] In the field of coffee machines and beverage processing equipment, steam pipes are used for high-temperature steam transportation. In existing technologies, steam pipes mostly use single-layer metal pipes or metal pipes with heat-insulating silicone sleeves on the outside. This structure has problems with heat loss and energy consumption, and the surface temperature of the pipe increases with the internal steam temperature, posing operational safety risks. To improve insulation performance, a double-layer vacuum structure is used in steam pipes. However, during operation, the steam pipe is subjected to alternating hot and cold temperatures and angular displacement. The thermal expansion deformation caused by the steam entering the inner pipe and the torsional stress generated by operation are concentrated at the connection points or welds at both ends of the pipe, causing stress fatigue and cracking of the welds, leading to vacuum layer failure. This makes it difficult for double-layer steam pipes to maintain thermal insulation performance and mechanical structural strength in a limited installation space for a long time. Summary of the Invention

[0003] In order to improve the shortcomings of existing coffee machine steam pipes, such as poor heat insulation, easy burns to users, and easy sealing failure and vacuum leakage of double-layer pipes under thermal expansion and torsional stress, this application provides a coffee machine vacuum steam pipe and its manufacturing method.

[0004] The technical solution provided in this application for a coffee machine vacuum steam pipe and its manufacturing method is as follows: A vacuum steam hose for a coffee machine includes an inner tube, an outer tube sleeved on the outside of the inner tube, a first connecting mechanism connected to one end of the inner tube and the outer tube respectively, a second connecting mechanism connected to the other end of the inner tube and the outer tube respectively, an inner tube spacer mechanism sleeved on the outer wall of the inner tube and located between the inner tube and the outer tube, and an inner tube spacer elastic member sleeved on the outer wall of the inner tube and located between two adjacent inner tube spacer mechanisms; the inner tube, the outer tube, the first connecting mechanism and the second connecting mechanism are arranged to form a vacuum cavity, a plurality of inner tube spacer mechanisms are arranged in an array along the length direction of the inner tube and located in the vacuum cavity, and the inner tube spacer elastic member is located in the vacuum cavity.

[0005] By adopting the above technical solution, the vacuum chamber blocks heat conduction and convection, suppressing the temperature rise of the outer tube surface to prevent burns during operation, while reducing heat loss in the steam transport process. Within the vacuum chamber, an array-type flexible support structure is constructed using an inner tube spacer mechanism and an inner tube spacer elastic element, providing multi-point radial centering for the inner tube. When the inner tube expands axially due to the high-temperature steam, it moves the inner tube spacer mechanism and compresses the inner tube spacer elastic element. The deformation of the inner tube spacer elastic element absorbs the thermodynamic displacement load, preventing the mechanical stress caused by the difference in deformation between the inner and outer tubes from being directly transmitted to the welding joint between the first and second connecting mechanisms. This application disperses the thermal expansion stress of the pipeline and the torsional force caused by external manipulation, avoiding stress concentration at the end connection of the tube body, reducing the risk of fatigue damage and cracking of the end weld, improving the overall structural stability of the multi-layer pipe assembly, and extending the service life under vacuum insulation.

[0006] Preferably, the first connection mechanism includes a first connector inserted into the opening end of the vacuum cavity and connected to the ends of the inner tube and the outer tube respectively, and a silicon tube connector inserted into the end of the first connector and connected to the first connector.

[0007] By adopting the above technical solution, the first connecting seat is positioned between the inner tube and the outer tube to seal the axial end face of the vacuum cavity, and the silicon tube connector is docked with the first connecting seat to form a fluid conduction path; this application realizes the coaxial constraint of the inner tube and the outer tube and the end gas-tight fitting through the first connecting seat, and enhances the compatibility of external pipeline docking with the silicon tube connector, making the end structure layout compact and improving the balanced force distribution in the connection area.

[0008] Preferably, the second connection mechanism includes a vacuum connector inserted into the other open end of the vacuum cavity and connected to the other ends of the inner tube and the outer tube respectively, and a second connecting seat connected to the vacuum connector.

[0009] By adopting the above technical solution, the pipe end support, cavity sealing and exhaust process interface are integrated into the vacuum joint. On the basis of completing the coaxial fixation of the inner and outer pipes, the hardware requirements of the vacuum establishment process are met. Combined with the second connecting seat, the exhaust end face is provided with physical protection and external assembly support, ensuring the vacuum sealing life of the pipeline assembly under operating conditions.

[0010] Preferably, the vacuum connector includes a connector body and a plug inserted into the connector body; the connector body is provided with a plug insertion hole for inserting the plug and a vacuum through hole for connecting the plug insertion hole and the vacuum chamber, wherein the inner diameter of the vacuum through hole is smaller than the inner diameter of the plug insertion hole.

[0011] By adopting the above technical solution, the external equipment draws air from the vacuum chamber through the plug insertion hole and the vacuum through hole. After the exhaust is completed, an axial thrust is applied to the plug, causing the plug to slide along the plug insertion hole and abut against the aforementioned step limiting surface. Subsequently, the gas channel is physically sealed through a welding process. The aperture difference fit structure of this application constructs a mechanical stop surface during the plug pressing stage, preventing the plug from penetrating the joint body and falling into the vacuum chamber during force assembly, which would cause damage to parts and internal interference. This ensures that the pressing depth is within a stable range, improves the consistency of the assembly process in mass production, and enhances the long-term reliability of the node seal.

[0012] Preferably, it further includes a rubber sleeve fitted on the outer side wall of the outer tube, and rubber sleeve protrusions formed on the outer side wall of the rubber sleeve and arranged in an array along the length direction of the rubber sleeve.

[0013] By adopting the above technical solution, the rubber sleeve protrusion undergoes elastic deformation under pressure to adhere to the external operating body; this application constructs a physical buffer and thermal insulation layer through the rubber sleeve, and reduces the contact area of ​​the external entity by utilizing the array arrangement of the rubber sleeve protrusion, thereby increasing the friction coefficient of the tube surface to improve the anti-slip stability during operation, while further slowing down the rate of internal heat transfer to the outside.

[0014] Preferably, the outer wall of the inner tube is also provided with a heat insulation layer.

[0015] By adopting the above technical solution, the thermal insulation layer is coaxially wrapped around the outer wall of the inner pipe. When the inner pipe is transporting high-temperature steam, the thermal insulation layer is on the heat expansion path, which not only reduces the heat loss along the steam transport path, but also reduces the heat's effect on the baking and aging of adjacent external components, and improves the structural stability and thermal insulation durability of the pipeline in high-temperature operating environment.

[0016] Preferably, the inner tube spacer mechanism includes a spacer body sleeved on the outer wall of the inner tube, a limiting guide seat inserted into the spacer body and extending from both sides of the spacer body, an elastic pressing member movably inserted into the middle position of the limiting guide seat, an inner tube limiting component and an outer tube limiting component inserted into both ends of the limiting guide seat and respectively pressing and engaging with both ends of the elastic pressing member, wherein the inner tube limiting component and the outer tube limiting component are respectively used to move along the length direction of the limiting guide seat; The inner tube has an inner tube circumferential limiting groove on its outer side wall for inserting the inner tube limiting component, and the outer tube has an outer tube circumferential limiting groove on its inner side wall for inserting the outer tube limiting component.

[0017] By adopting the above technical solution, under the stress operation state, the external circumferential rotational torque is sequentially transmitted to the inner tube circumferential limiting groove via the outer tube circumferential limiting groove, the outer tube limiting component, the limiting guide seat, and the inner tube limiting component, driving the inner and outer tubes to rotate synchronously; when under high temperature thermal expansion conditions, the inner tube limiting component and the outer tube limiting component can slide axially relative to each other in the corresponding circumferential limiting grooves; this application can compensate for thermal expansion and contraction displacement, and block the transmission path of the external operating torque to the connection nodes at both ends, protecting the connection parts at the end of the tube from torsional stress damage, and maintaining the stability of the overall component assembly relationship and the long-term effectiveness of the vacuum seal.

[0018] Preferably, both the inner tube limiting assembly and the outer tube limiting assembly have limiting flanges on their sidewalls, and a limiting groove is also provided on one side of the limiting flange. The inner wall of the limiting guide seat is provided with a guide groove for the insertion of the limiting protrusion, and a guide protrusion located on one side of the guide groove for insertion into the limiting groove.

[0019] By adopting the above technical solution, when the inner tube limiting component and the outer tube limiting component are subjected to axial thrust, the limiting protrusion and the guide groove, and the guide protrusion and the limiting groove simultaneously undergo axial relative sliding; when subjected to circumferential torque, the side wall of the limiting protrusion abuts against the inner wall of the guide groove, and the side wall of the guide protrusion abuts against the inner wall of the limiting groove, thus constructing a double circumferential stop restriction; this application expands the guiding contact area between moving parts through the interactive nesting of the limiting protrusion, the limiting groove and the guide groove, and the guide protrusion, avoiding radial offset or jamming during the sliding stroke, dispersing the force load in the torque transmission area, reducing the risk of local stress concentration caused by a single limiting structure, and improving the smoothness of operation and structural durability of the limiting and guiding mechanism under complex stress conditions.

[0020] Preferably, the spacer body is provided with an air intake receiving groove that communicates with the vacuum cavity, and the inner tube spacer mechanism further includes an air intake component inserted into the air intake receiving groove and extending into the vacuum cavity.

[0021] By adopting the above technical solution, the gas intake component expands the gas contact area by exposing structural parts in the vacuum chamber, continuously capturing and fixing free gas molecules released by the pipeline when heated; this application utilizes the active adsorption function of the gas intake component to suppress the vacuum decay caused by gas release from the pipe wall material, maintain the low-pressure insulation environment inside the vacuum chamber, and ensure the long-term thermal insulation effect of the pipeline component.

[0022] A method for manufacturing a vacuum steam wand for a coffee machine includes the following steps: S1. Connect one end of the inner tube to one end of the first connecting mechanism; S2. The multiple inner tube spacer mechanisms and the inner tube spacer elastic elements are alternately sleeved on the outer side wall of the inner tube, so that the inner tube spacer elastic elements are located between two adjacent inner tube spacer mechanisms. S3. The outer tube is sleeved on the outside of the inner tube after the inner tube spacer mechanism and the inner tube spacer elastic member are assembled, and the first connecting mechanism is connected to one end of the outer tube; S4. Connect one end of the second connecting mechanism to the other end of the inner tube, and connect the other end of the second connecting mechanism to the other end of the outer tube; at this time, the first connecting mechanism, the inner tube, the second connecting mechanism, and the outer tube together form a closed cavity; S5. Vacuum the cavity to form a vacuum chamber.

[0023] By adopting the above technical solution, this application, through a layered coaxial assembly sequence from the inside out and from one end to the other, first completes the end connection between the inner tube and the first connecting mechanism, then alternately sleeves the inner tube spacer mechanism and the inner tube spacer elastic element on the outside of the inner tube, then coaxially sleeves the outer tube and completes the fixation between the first connecting mechanism and the end of the outer tube, then uses the second connecting mechanism to seal the other end of the inner tube and the outer tube to form a sealed cavity, and finally extracts the gas inside the cavity through the exhaust process to form a vacuum cavity. By setting the nested assembly sequence of the inner tube spacer mechanism and the inner tube spacer elastic element, this application reduces physical interference and structural misalignment during the assembly of multi-layer tubes, and creates a sealed environment for the exhaust operation through the physical encapsulation of the end connecting components, ensuring the coaxiality of the multi-layer pipeline assembly and the airtightness of the end interface, improving the continuity of the overall processing steps of the vacuum tube and the quality consistency of the batch finished products.

[0024] In summary, this application includes at least one of the following beneficial technical effects: 1. A vacuum steam pipe for a coffee machine, which, through a vacuum chamber, blocks heat conduction and convection, suppresses the rise in surface temperature of the outer pipe to prevent burns during operation, and reduces heat loss in the steam delivery process; within the vacuum chamber, an array-type flexible support structure is constructed through an inner pipe spacer mechanism and an inner pipe spacer elastic element, providing multi-point radial centering positioning for the inner pipe; when the inner pipe expands axially due to the influence of high-temperature steam, the inner pipe moves the inner pipe spacer mechanism and compresses the inner pipe spacer elastic element, and the deformation of the inner pipe spacer elastic element absorbs the thermodynamic displacement load, preventing the mechanical stress caused by the difference in deformation between the inner and outer pipes from being directly transmitted to the welding joint of the first connection mechanism and the second connection mechanism; this application disperses the thermal expansion stress of the pipeline and the torsional force caused by external manipulation, avoids stress concentration at the end connection of the pipe body, reduces the risk of fatigue damage and cracking of the end weld, improves the overall structural stability of the multi-layer pipe assembly, and extends the service life under vacuum insulation; 2. A vacuum steam pipe for a coffee machine, wherein, under stressed operation, the external circumferential rotational torque is sequentially transmitted to the inner tube circumferential limiting groove via the outer tube circumferential limiting groove, the outer tube limiting component, the limiting guide seat, and the inner tube limiting component, driving the inner and outer tubes to rotate synchronously; when under high-temperature thermal expansion conditions, the inner tube limiting component and the outer tube limiting component can slide axially relative to each other within the corresponding circumferential limiting grooves; this application can compensate for thermal expansion and contraction displacement and block the transmission path of the external operating torque to the connection nodes at both ends, protecting the connection parts at the end of the pipe from torsional stress damage, and maintaining the stability of the overall component assembly relationship and the long-term effectiveness of the vacuum seal; 3. A method for manufacturing a vacuum steam pipe for a coffee machine. This application employs a layered coaxial assembly sequence from the inside out and from one end to the other. First, the inner tube is joined to the end of the first connecting mechanism. The inner tube spacer mechanism and the inner tube spacer elastic element are alternately fitted onto the outside of the inner tube. Then, the outer tube is coaxially fitted and the first connecting mechanism is fixed to the end of the outer tube. Subsequently, the other end of the inner tube and the outer tube is sealed using the second connecting mechanism to create a sealed cavity. Finally, the gas inside the cavity is extracted through an exhaust process to form a vacuum cavity. By setting the nested assembly sequence of the inner tube spacer mechanism and the inner tube spacer elastic element, this application reduces physical interference and structural misalignment during the assembly of multi-layer pipe components. The physical encapsulation of the end connecting components creates a sealed environment for the exhaust operation, ensuring the coaxiality of the multi-layer pipe assembly and the airtightness of the end interface. This improves the continuity of the overall processing steps of the vacuum pipe components and the quality consistency of batch finished products. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural schematic diagram of an embodiment of the vacuum steam pipe of the coffee machine in this application.

[0026] Figure 2 for Figure 1 Enlarged view of part A in the middle.

[0027] Figure 3 for Figure 1 Enlarged view of section B.

[0028] Figure 4 This is a schematic flowchart illustrating the steps of an embodiment of the manufacturing method of the vacuum steam pipe for a coffee machine according to this application.

[0029] Explanation of reference numerals in the attached figures: 1. Inner tube; 11. Inner tube circumferential limiting groove; 2. Outer tube; 21. Outer tube circumferential limiting groove; 3. First connecting mechanism; 31. First connecting seat; 32. Silicon tube connector; 4. Second connecting mechanism; 41. Vacuum connector; 42. Second connecting seat; 411. Connector body; 412. Blocking pin; 413. Blocking pin insertion hole; 414. Vacuum through hole; 5. Inner tube spacer mechanism; 51. Spacer body; 52. Limiting guide seat; 53. Elastic pressing component; 54. Inner tube limiting assembly; 55. Outer tube limiting assembly; 56. Limiting flange; 57. Limiting slide groove; 58. Suction assembly; 511. Suction receiving groove; 521. Guide slide groove; 522. Guide flange; 6. Inner tube spacer elastic component; 7. Vacuum cavity; 8. Rubber sleeve; 81. Rubber sleeve flange; 9. Thermal insulation layer. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail.

[0031] This application discloses a vacuum steam pipe for a coffee machine and its manufacturing method. (See also...) Figure 1 A vacuum steam pipe for a coffee machine includes an inner tube 1, an outer tube 2 sleeved on the outside of the inner tube 1, a first connecting mechanism 3 connected to one end of the inner tube 1 and the outer tube 2 respectively, a second connecting mechanism 4 connected to the other end of the inner tube 1 and the outer tube 2 respectively, an inner tube spacer mechanism 5 sleeved on the outer wall of the inner tube 1 and located between the inner tube 1 and the outer tube 2, and an inner tube spacer elastic member 6 sleeved on the outer wall of the inner tube 1 and located between two adjacent inner tube spacer mechanisms 5; the inner tube 1, the outer tube 2, the first connecting mechanism 3 and the second connecting mechanism 4 are arranged to form a vacuum cavity 7, and a plurality of inner tube spacer mechanisms 5 are arranged in an array along the length direction of the inner tube 1 and located in the vacuum cavity 7, and the inner tube spacer elastic member 6 is located in the vacuum cavity 7.

[0032] This application constructs a closed vacuum cavity 7 between the inner tube 1 and the outer tube 2. By utilizing the vacuum environment, it blocks the conduction and convection paths of heat, reducing the outer wall temperature of the outer tube 2 and eliminating potential safety hazards for users. Simultaneously, it reduces heat loss during high-temperature steam transport, improving the equipment's thermal efficiency. Furthermore, the array-like flexible support formed by the inner tube spacer mechanism 5 and the inner tube spacer elastic element 6 within the vacuum cavity 7 provides multi-point radial support for the inner tube 1. When the inner tube 1 undergoes thermal expansion due to the high-temperature steam, it experiences axial extension displacement, causing the inner tube spacer mechanism 5 to move synchronously and exert axial pressure on the inner tube spacer elastic element 6. The elastic element 6 absorbs the thermal displacement of the inner tube 1 during compression deformation. At the same time, the inner tube spacer mechanism 5 radially supports the inner tube 1, keeping it at the center of the vacuum chamber 7. This prevents the mechanical stress caused by the inconsistent expansion rates of the inner tube 1 and the outer tube 2 from directly acting on the welding joint between the first connecting mechanism 3 and the second connecting mechanism 4. The vacuum chamber 7 of this application blocks heat conduction, reduces steam heat loss, and lowers the outer wall temperature of the outer tube 2. The inner tube spacer mechanism 5 and the elastic element 6 work together to relieve mechanical stress, ensuring the structural stability of the connection part, avoiding the concentration of torsional stress at the end of the tube, reducing the probability of fatigue damage and cracking of the weld, and extending the service life of the vacuum layer. exist Figure 1 In the bent section of the pipe shown, the inner tube spacer mechanism 5 provides a stable radial centering effect in the non-straight section, ensuring that the inner tube 1 can still maintain a uniform gap with the outer tube 2 at the bend, avoiding physical contact between the inner tube 1 and the outer tube 2 under bending stress and thus preventing thermal bridging effect, and ensuring the heat insulation uniformity of the irregular section; the inner tube spacer elastic element 6 is preferably a spring.

[0033] Furthermore, such as Figure 1 As shown, the first connecting mechanism 3 includes a first connecting seat 31 and a silicon tube connector 32. In this application, the first connecting seat 31 is inserted into the opening end of the vacuum chamber 7, and the first connecting seat 31 is sealed to the end of the inner tube 1 and the end of the outer tube 2 respectively. The silicon tube connector 32 is inserted into the end of the first connecting seat 31 and is fixedly connected to the first connecting seat 31. The first connecting seat 31 is positioned between the inner tube 1 and the outer tube 2 through the insertion action to seal the axial end of the vacuum chamber 7. The silicon tube connector 32 is combined with the first connecting seat 31 through the insertion method to form a fluid connection channel. This application uses the first connecting seat 31 to achieve coaxial fixation of the inner tube 1 and the outer tube 2 and end airtightness, and with the silicon tube connector 32, it improves the external pipeline connection adaptability. The overall structure is compact and ensures the force balance of the connection part.

[0034] Furthermore, such as Figure 2As shown, the second connecting mechanism 4 includes a vacuum connector 41 and a second connecting seat 42. In this application, the vacuum connector 41 is inserted into the opening at the other end of the vacuum chamber 7, achieving a sealed connection with the other end of the inner tube 1 and the other end of the outer tube 2. The second connecting seat 42 is fixedly connected to the vacuum connector 41. In this application, the vacuum connector 41 is first inserted and positioned between the inner tube 1 and the outer tube 2 to seal the other axial end of the vacuum chamber 7. The vacuum connector 41 serves as an airflow channel for vacuuming and venting the interior of the vacuum chamber 7. After the venting process is completed, the second connecting seat 42 is assembled onto the end of the vacuum connector 41. This application concentrates physical support, sealing, and the venting process interface at the vacuum connector 41, providing hardware support for establishing a vacuum environment while simultaneously fixing the ends of the inner tube 1 and the outer tube 2 coaxially. The second connecting seat 42 provides structural protection and external assembly support for the venting connector, ensuring the operability of the entire pipe structure during processing and the durability of the sealing state during operation.

[0035] Specifically, such as Figure 2 As shown, the vacuum connector 41 includes a connector body 411 and a plug pin 412. The connector body 411 of this application has a plug pin insertion hole 413 and a vacuum through hole 414 sequentially extending through it. The vacuum through hole 414 serves as a fluid channel connecting the vacuum chamber 7 and the plug pin insertion hole 413. Since the inner diameter of the vacuum through hole 414 is smaller than the inner diameter of the plug pin insertion hole 413, a stepped limiting surface is formed at the junction of the two holes. The plug pin 412 is inserted and tightly fitted into the plug pin insertion hole 413 of the connector body 411. During the exhaust process, external equipment is pre-extracted through the plug pin insertion hole 413 and the vacuum through hole 414. After the air inside the vacuum chamber 7 is exhausted to the required standard, the tooling equipment applies an axial thrust to the plug pin 412, causing the plug pin 412 to slide deeper along the plug pin insertion hole 413 until the end of the plug pin 412 abuts against the stepped limiting surface at the edge of the vacuum through hole 414 and is forced to stop moving, and is then welded to complete the physical blockage and sealing of the channel. The hole diameter difference fit structure of this application provides a stable mechanical stop for the pressing action of the plug pin 412, preventing the plug pin 412 from passing through the connector body 411 and falling into the vacuum chamber 7 under assembly stress, causing part interference and damage, and ensuring the controllability of the pressing depth and the consistency of mass production assembly.

[0036] In addition, such as Figure 1As shown, it also includes a rubber sleeve 8 and rubber sleeve protrusions 81. In this application, the rubber sleeve 8 coaxially covers the outer wall of the outer tube 2, and multiple rubber sleeve protrusions 81 are integrally formed on the outer wall of the rubber sleeve 8 and are distributed in an array at intervals along the length of the rubber sleeve 8. The rubber sleeve 8 adheres to the surface of the outer tube 2 through the friction of the inner wall and remains stationary. When the external operating body holds the tube, the applied holding pressure is first concentrated on the top edge of the rubber sleeve protrusions 81. The rubber sleeve protrusions 81 bear the pressure and produce a small elastic deformation to fit the surface of the external operating body. This application uses the rubber sleeve 8 to provide a physical wrapping buffer and basic isolation layer for the surface of the outer tube 2. The arrayed arrangement of the rubber sleeve protrusions 81 reduces the physical contact area of ​​the outer tube 2, increases the friction coefficient of the outer surface of the tube, slows down the rate of internal heat conduction to the outside, and improves the anti-slip stability and external protection capability of the overall tube under the holding operation state.

[0037] And, as Figure 3 As shown, the inner tube 1 is also provided with a thermal insulation layer 9. In this application, the thermal insulation layer 9 is coaxially covered and fixed to the outer wall surface of the inner tube 1. When high-temperature steam is transported inside the inner tube 1, the heat energy is conducted outward from the wall surface of the inner tube 1. The thermal insulation layer 9, as a physical medium, is set on the heat conduction path. It absorbs and blocks the heat from spreading to the surrounding environment by relying on the thermal resistance characteristics of the material itself, thereby slowing down the heat radiation and heat conduction rate of the inner tube 1 surface. In this application, the thermal insulation layer 9 is used to construct a heat insulation barrier, reduce the heat energy loss in the steam transportation process, reduce the probability of heat aging of adjacent external components, and improve the physical state and thermal insulation performance stability of the pipeline under high-temperature operating conditions. The thermal insulation layer 9 is preferably one or a combination of aerogel composite material, polyimide thermal insulation film, nano-ceramic thermal insulation coating, or metal radiation reflective coating. When the thermal insulation layer 9 uses a nano-ceramic thermal insulation coating, it can be directly attached and cured to the outer wall surface of the inner tube 1 by spraying. The nano-ceramic thermal insulation coating uses the thermal resistance characteristics of the material itself to block the heat conduction path from the inner tube 1 to the outer tube 2. When the thermal insulation layer 9 uses an aerogel composite material, the porous network structure inside the aerogel composite material can limit the heat convection at the micro level, and further reduce the heat transfer rate in combination with the low-pressure environment of the vacuum cavity 7. When the thermal insulation layer 9 uses a metal radiation reflective coating (such as a silver plating layer or a copper plating layer), the metal radiation reflective coating can reflect the infrared heat radiation generated by the high-temperature steam running in the inner tube 1, reducing radiative heat loss.

[0038] Furthermore, such as Figure 3 As shown, the inner tube spacer mechanism 5 includes a spacer body 51, a limiting guide seat 52, an elastic pressing member 53, an inner tube limiting component 54, and an outer tube limiting component 55; the outer side wall of the inner tube 1 is provided with an inner tube circumferential limiting groove 11, and the inner side wall of the outer tube 2 is provided with an outer tube circumferential limiting groove 21.

[0039] The spacer body 51 is fitted onto the outer surface of the inner tube 1. The limiting guide seat 52 is inserted into the spacer body 51 and its two ends extend out of the two sides of the spacer body 51. The elastic pressing member 53 is movably inserted into the middle receiving space of the limiting guide seat 52. The inner tube limiting component 54 and the outer tube limiting component 55 are movably inserted into the two ends of the limiting guide seat 52. The inner and outer ends of the inner tube limiting component 54 and the outer tube limiting component 55 are elastically pressing and abutting against the two end faces of the elastic pressing member 53. At the same time, the outer end of the inner tube limiting component 54 extends into the inner tube circumferential limiting groove 11 opened on the outer wall of the inner tube 1, and the outer end of the outer tube limiting component 55 extends into the outer tube circumferential limiting groove 21 opened on the inner wall of the outer tube 2. The elastic pressing component 53 of this application continuously releases elastic thrust, pushing the inner tube limiting component 54 and the outer tube limiting component 55 outward along the length direction of the limiting guide seat 52. This drives the inner tube limiting component 54 and the outer tube limiting component 55 to remain in a limiting support state inside the inner tube circumferential limiting groove 11 and the outer tube circumferential limiting groove 21, respectively. When subjected to an externally applied rotational torque, the outer tube 2 transmits the circumferential force to the outer tube limiting component 55, the limiting guide seat 52, the inner tube limiting component 54, and the inner tube circumferential limiting groove 21 through the outer tube circumferential limiting groove 21. The positioning groove 11 forces the inner tube 1 and the outer tube 2 to rotate synchronously in the circumferential direction. When the inner tube 1 is heated and its axial dimension expands, the inner tube limiting component 54 and the outer tube limiting component 55 slide relative to each other in the axial direction along the corresponding inner tube circumferential limiting groove 11 and outer tube circumferential limiting groove 21. This application can compensate for thermal expansion and contraction displacement and block the transmission path of external operating torque to the connection nodes at both ends, protect the connection part at the end of the tube body from torsional stress damage, and maintain the stability of the overall component assembly relationship and the long-term effectiveness of vacuum sealing. The elastic pressing member 53 is preferably a spring.

[0040] Furthermore, such as Figure 3 As shown, both the inner tube limiting assembly 54 and the outer tube limiting assembly 55 of this application have a limiting flange 56 and a limiting groove 57 disposed on one side of the limiting flange 56. The inner side wall of the limiting guide seat 52 has a guide groove 521 and a guide flange 522 disposed on one side of the guide groove 521. The limiting flange 56 is slidably inserted into the guide groove 521, and the guide flange 522 is slidably inserted into the limiting groove 57, forming a sliding fit structure with mutually nested concave and convex features. When the inner tube limiting assembly 54 and the outer tube limiting assembly 55 are subjected to axial thrust or axial displacement caused by thermal expansion and contraction, the limiting protrusion 56 slides linearly along the extension direction of the guide groove 521, and simultaneously the limiting groove 57 slides linearly along the extension direction of the guide protrusion 522. When faced with an externally applied circumferential rotational torque, the sidewall of the limiting protrusion 56 abuts against the inner wall of the guide groove 521, and the sidewall of the guide protrusion 522 abuts against the inner wall of the limiting groove 57, forming a double circumferential stop restriction; this application utilizes the limiting... The interaction between the positioning protrusion 56, the limiting slide groove 57, the guide slide groove 521, and the guide protrusion 522 increases the guiding area of ​​the moving parts in contact with each other, improves the smooth sliding of the inner tube limiting assembly 54 and the outer tube limiting assembly 55 along a single axis inside the limiting guide seat 52, avoids radial offset or jamming during the sliding stroke, disperses the stress load in the torque transmission area, reduces the risk of local stress concentration caused by a single limiting structure, and improves the smoothness of operation and structural durability of the limiting guide mechanism under complex stress conditions.

[0041] Specifically, such as Figure 3 As shown, the inner tube spacer mechanism 5 also includes a suction component 58. The spacer body 51 of this application has a suction receiving groove 511 on its surface, and the internal space of the suction receiving groove 511 is in communication with the vacuum chamber 7. The suction component 58 is fixedly inserted inside the suction receiving groove 511 and partially extends out of the vacuum chamber 7. When the pipe is in a high-temperature working environment, the pipe metal material releases a small amount of residual gas upon heating and diffuses into the vacuum chamber 7. The suction component 58, by extending into the vacuum chamber 7, increases the contact area with the free gas, continuously capturing and fixing the free gas molecules generated inside the vacuum chamber 7. This application mitigates the vacuum decay caused by the release of gas from the pipe wall material through the active suction mechanism of the suction component 58, keeping the inside of the vacuum chamber 7 in a low-pressure environment, ensuring the long-term thermal insulation performance and overall operational reliability of the pipe. The getter assembly 58 is made of a getter block or getter material strip with a porous microstructure, such as zirconium vanadium iron alloy or titanium zirconium alloy. When the getter assembly 58 is fixedly inserted into the getter receiving groove 511 and partially extends into the vacuum chamber 7, in the low-pressure environment of the vacuum chamber 7, during the operation of transporting high-temperature steam inside the inner tube 1 and generating heat radiation to the surroundings, the getter assembly 58 undergoes surface activation upon heating. Utilizing the active metal sites and lattice gaps within the material, it continuously captures and chemically binds trace amounts of free impurity gas molecules such as hydrogen, oxygen, and carbon monoxide slowly released from the surrounding tube wall material due to high-temperature baking. This application utilizes the active getter characteristics of the metal alloy to prevent the continuous accumulation of free gas molecules inside the vacuum chamber 7, slowing down the rate of pressure rise inside the vacuum chamber 7 caused by the material's outgassing effect, maintaining the internal space of the steam pipe in a low-pressure, heat-insulating state, and ensuring the vacuum life and thermal barrier performance of the tube body under long-term, high-frequency alternating hot and cold environments.

[0042] More specifically, such as Figure 4 As shown, a method for manufacturing a vacuum steam hose for a coffee machine includes the following steps: S1. Connect one end of the inner tube 1 to one end of the first connecting mechanism 3; S2. Multiple inner tube spacer mechanisms 5 and inner tube spacer elastic elements 6 are alternately sleeved on the outer side wall of the inner tube 1, so that the inner tube spacer elastic elements 6 are located between two adjacent inner tube spacer mechanisms 5. S3. The outer tube 2 is fitted onto the outside of the inner tube 1, which is equipped with the inner tube spacer mechanism 5 and the inner tube spacer elastic element 6, and the first connecting mechanism 3 is connected to one end of the outer tube 2. S4. Connect one end of the second connecting mechanism 4 to the other end of the inner tube 1, and connect the other end of the second connecting mechanism 4 to the other end of the outer tube 2; at this time, the first connecting mechanism 3, the inner tube 1, the second connecting mechanism 4 and the outer tube 2 together form a closed cavity. S5. Vacuum the cavity to form a vacuum chamber 7.

[0043] This application first completes the fixed connection between one end of the inner tube 1 and one end of the first connecting mechanism 3. Then, multiple inner tube spacer mechanisms 5 and inner tube spacer elastic elements 6 are alternately placed on the outer wall surface of the inner tube 1, so that the inner tube spacer elastic elements 6 are in the assembly position between two adjacent inner tube spacer mechanisms 5. Next, the outer tube 2 is coaxially sleeved on the outside of the inner tube 1 that has been equipped with inner tube spacer mechanisms 5 and inner tube spacer elastic elements 6. The first connecting mechanism 3 is fixedly connected to one end of the outer tube 2. Then, one end of the second connecting mechanism 4 is connected to the other end of the inner tube 1, and the other end of the second connecting mechanism 4 is connected to the other end of the outer tube 2. The assembly and combination of the first connecting mechanism 3, the inner tube 1, the second connecting mechanism 4 and the outer tube 2 together form a cavity in a closed state. The cavity is evacuated by the exhaust process, so that the cavity is transformed into a vacuum cavity 7. This application adopts a progressive coaxial assembly from the inside out and from one end to the other. By using the internal interlocking assembly sequence of the inner tube spacer mechanism 5 and the inner tube spacer elastic element 6, structural interference and misalignment problems caused by multiple nested tubes during the assembly process are avoided. The physical sealing operation of the end connectors provides a sealed environment for the subsequent evacuation and venting process, ensuring the coaxiality of the multi-layer pipeline assembly and the airtightness of the connection interface, thereby improving the continuity of the overall vacuum tube processing flow and the stability of the finished product quality.

[0044] As a further refinement of the above manufacturing method, step S1 also includes component pretreatment and first end assembly process: before overall assembly, a layered heat insulation layer 9 is first wrapped on the outer wall surface of the inner tube 1; at the same time, the first connecting seat 31 is inserted into the preset open end position, so that the first connecting seat 31 and one end of the inner tube 1 are sealed and connected, and then the silicon tube connector 32 is inserted into the end of the first connecting seat 31 away from the inner tube 1 and fixed connection is completed, thereby constructing the first connecting mechanism 3.

[0045] Step S2 also includes the pre-assembly of the inner tube spacer mechanism and the installation of the internal support array: before installing the inner tube spacer mechanism 5 onto the inner tube 1, internal assembly is performed first, and the suction component 58 is inserted into the suction receiving groove 511 opened on the spacer body 51; a limiting guide seat 52 is inserted on the spacer body 51, and an elastic pressing member 53 is movably inserted at the middle position of the limiting guide seat 52; then, an inner tube limiting component 54 and an outer tube limiting component 55 are respectively inserted at both ends of the limiting guide seat 52, and the two ends of the elastic pressing member 53 are respectively pressed and engaged with the inner tube limiting component 54 and the outer tube limiting component 55. By utilizing the sliding nesting relationship between the limiting protrusion 56 and the guide groove 521, and between the limiting groove 57 and the guide protrusion 522, the inner tube limiting assembly 54 and the outer tube limiting assembly 55 are able to move along the length direction of the limiting guide seat 52. After pre-assembly, multiple inner tube spacer mechanisms 5 and multiple inner tube spacer elastic elements 6 are alternately sleeved on the outer wall of the inner tube 1, so that the inner tube limiting assembly 54 is correspondingly inserted into the preset inner tube circumferential limiting groove 11 on the outer wall of the inner tube 1, and ensuring that the inner tube spacer elastic element 6 is always located between two adjacent inner tube spacer mechanisms 5, forming an axially expandable and circumferentially limited support array.

[0046] Step S3 also includes the outer casing fitting and external protection installation process: the outer tube 2 is coaxially fitted on the outside of the inner tube 1, and the radial pressure of the outer tube 2 causes the outer tube limiting component 55 to move inward against the elastic force of the elastic pressing component 53 until the outer tube limiting component 55 is inserted into the outer tube circumferential limiting groove 21 opened on the inner side wall of the outer tube 2; then, after completing the sealing connection between one end of the outer tube 2 and the first connecting seat 31, a rubber sleeve 8 is fitted on the outer side wall surface of the outer tube 2, and the rubber sleeve protrusions 81 arranged in an array on the outer side wall of the rubber sleeve 8 provide external structural protection.

[0047] Step S4 also includes a second end sealing and cavity construction process: the connector body 411 of the vacuum connector 41 is inserted into the other open end formed by the inner tube 1 and the outer tube 2, and the connector body 411 is sealed and welded to the other ends of the inner tube 1 and the outer tube 2 respectively. Then, the second connecting seat 42 is installed to complete the assembly of the second connecting mechanism 4. At this time, the first connecting mechanism 3, the inner tube 1, the second connecting mechanism 4 and the outer tube 2 together form a closed cavity, and the suction assembly 58 extends into the closed cavity through the suction receiving groove 511.

[0048] Step S5 also includes a vacuuming process and a final sealing process: the sealed cavity is evacuated through the plug insertion hole 413 and the vacuuming through hole 414 on the connector body 411; when the negative pressure inside the cavity reaches the preset index, the plug 412 is axially inserted into the plug insertion hole 413. Since the inner diameter of the vacuuming through hole 414 is smaller than the inner diameter of the plug insertion hole 413, the plug 412 is moved by force to the change of the hole diameter to achieve physical sealing, thereby transforming the sealed cavity into a vacuum cavity 7 and completing the manufacturing of the overall pipe fitting.

[0049] All the connections described above in this application are made by laser welding.

[0050] The implementation principle of the coffee machine vacuum steam pipe and its manufacturing method in this application is as follows: A vacuum steam hose for a coffee machine utilizes a closed vacuum chamber 7 constructed between an inner tube 1 and an outer tube 2. This vacuum environment blocks heat conduction and convection, reducing the temperature of the outer wall of the outer tube 2 and eliminating safety hazards for users. Simultaneously, it minimizes heat loss during high-temperature steam transport, improving the equipment's thermal efficiency. Furthermore, an array of flexible supports formed within the vacuum chamber 7 by an inner tube spacer mechanism 5 and an inner tube spacer elastic element 6 provides multi-point radial support for the inner tube 1. When the inner tube 1 expands due to the high-temperature steam, it undergoes axial displacement, causing the inner tube spacer mechanism 5 to move synchronously and exert axial pressure on the inner tube spacer elastic element 6. The inner tube spacer elastic element 6 absorbs the thermal displacement of the inner tube 1 by compression deformation. At the same time, the inner tube spacer mechanism 5 radially supports the inner tube 1, keeping it at the center of the vacuum chamber 7. This prevents the mechanical stress caused by the inconsistent expansion rates of the inner tube 1 and the outer tube 2 from directly acting on the welding joint between the first connecting mechanism 3 and the second connecting mechanism 4. The vacuum chamber 7 of this application blocks heat conduction, reduces steam heat loss and lowers the outer wall temperature of the outer tube 2. The inner tube spacer mechanism 5 and the inner tube spacer elastic element 6 work together to relieve mechanical stress, ensure the structural stability of the connection part, avoid torsional stress concentration at the end of the tube body, reduce the probability of fatigue damage and cracking of the weld, and extend the service life of the vacuum layer. The elastic pressing component 53 of this application continuously releases elastic thrust, pushing the inner tube limiting component 54 and the outer tube limiting component 55 outward along the length direction of the limiting guide seat 52. This drives the inner tube limiting component 54 and the outer tube limiting component 55 to remain in a limiting support state inside the inner tube circumferential limiting groove 11 and the outer tube circumferential limiting groove 21, respectively. When subjected to an externally applied rotational torque, the outer tube 2 transmits the circumferential force to the outer tube limiting component 55, the limiting guide seat 52, the inner tube limiting component 54, and the inner tube circumferential limiting groove 21 through the outer tube circumferential limiting groove 21. The positioning groove 11 forces the inner tube 1 and the outer tube 2 to rotate synchronously in the circumferential direction. When the inner tube 1 is heated and its axial dimension expands, the inner tube limiting component 54 and the outer tube limiting component 55 slide relative to each other in the axial direction along the corresponding inner tube circumferential limiting groove 11 and outer tube circumferential limiting groove 21. This application can compensate for thermal expansion and contraction displacement and block the transmission path of external operating torque to the connection nodes at both ends, protect the connection part at the end of the tube body from torsional stress damage, and maintain the stability of the overall component assembly relationship and the long-term effectiveness of vacuum sealing. A method for manufacturing a vacuum steam hose for a coffee machine involves first fixing one end of an inner tube 1 to one end of a first connecting mechanism 3. Then, multiple inner tube spacer mechanisms 5 and inner tube spacer elastic elements 6 are sequentially and alternately fitted onto the outer wall surface of the inner tube 1, positioning the inner tube spacer elastic element 6 in the middle of two adjacent inner tube spacer mechanisms 5. Next, an outer tube 2 is coaxially fitted onto the outside of the inner tube 1, which already has the inner tube spacer mechanisms 5 and inner tube spacer elastic elements 6. The first connecting mechanism 3 is fixedly connected to one end of the outer tube 2. Then, one end of a second connecting mechanism 4 is connected to the other end of the inner tube 1, and simultaneously, the other end of the second connecting mechanism 4 is connected to the other end of the outer tube 2. The first connecting mechanism 3, inner tube spacer 5, and inner tube spacer elastic elements 6 are then fixedly fitted onto the outer wall surface of the inner tube 1. The assembly and combination of tube 1, the second connecting mechanism 4, and the outer tube 2 together form a closed cavity. The cavity is evacuated through an exhaust process, transforming it into a vacuum chamber 7. This application adopts a progressive coaxial assembly from the inside out and from one end to the other. By using the internal interlocking assembly sequence of the inner tube spacer mechanism 5 and the inner tube spacer elastic element 6, structural interference and misalignment problems during the assembly of multiple nested tubes are avoided. The physical sealing operation of the end connectors provides a sealed environment for the subsequent evacuation and venting process, ensuring the coaxiality of the multi-layer pipeline assembly and the airtightness of the connection interface, thereby improving the continuity of the overall vacuum tube processing flow and the stability of the finished product quality.

[0051] 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 coffee machine vacuum steam tube, characterized in that, The device includes an inner tube (1), an outer tube (2) sleeved on the outside of the inner tube (1), a first connecting mechanism (3) connected to one end of the inner tube (1) and the outer tube (2) respectively, a second connecting mechanism (4) connected to the other end of the inner tube (1) and the outer tube (2) respectively, an inner tube spacer mechanism (5) sleeved on the outer wall of the inner tube (1) and located between the inner tube (1) and the outer tube (2), and an inner tube spacer elastic member (6) sleeved on the outer wall of the inner tube (1) and located between two adjacent inner tube spacer mechanisms (5); the inner tube (1), the outer tube (2), the first connecting mechanism (3) and the second connecting mechanism (4) surround to form a vacuum cavity (7), a plurality of inner tube spacer mechanisms (5) are arranged in an array along the length direction of the inner tube (1) and located in the vacuum cavity (7), and the inner tube spacer elastic member (6) is located in the vacuum cavity (7).

2. The coffee machine steam vacuum tube according to claim 1, characterized in that, The first connection mechanism (3) includes a first connector (31) inserted into the opening end of the vacuum cavity (7) and connected to the ends of the inner tube (1) and the outer tube (2) respectively, and a silicon tube connector (32) inserted into the end of the first connector (31) and connected to the first connector (31).

3. The coffee machine vacuum steam pipe according to claim 1, characterized in that, The second connection mechanism (4) includes a vacuum connector (41) inserted into the other open end of the vacuum chamber (7) and connected to the other ends of the inner tube (1) and the outer tube (2) respectively, and a second connection seat (42) connected to the vacuum connector (41).

4. The coffee machine steam vacuum tube according to claim 3, characterized in that, The vacuum connector (41) includes a connector body (411) and a plug (412) inserted into the connector body (411); the connector body (411) is provided with a plug insertion hole (413) for inserting the plug (412) and a vacuum through hole (414) for connecting the plug insertion hole (413) and the vacuum chamber (7), the inner diameter of the vacuum through hole (414) being smaller than the inner diameter of the plug insertion hole (413).

5. The coffee machine steam vacuum tube of claim 1, wherein, It also includes a rubber sleeve (8) fitted on the outer wall of the outer tube (2), and rubber sleeve protrusions (81) formed on the outer wall of the rubber sleeve (8) and arranged in an array along the length direction of the rubber sleeve (8).

6. The coffee machine steam vacuum tube of claim 1, wherein, The inner tube (1) is also provided with a heat insulation layer (9) on the outer wall.

7. The coffee machine steam vacuum tube of claim 1, wherein, The inner tube spacer mechanism (5) includes a spacer body (51) sleeved on the outer wall of the inner tube (1), a limiting guide seat (52) inserted on the spacer body (51) and extending from both sides of the spacer body (51), an elastic pressing member (53) movably inserted at the middle position of the limiting guide seat (52), an inner tube limiting assembly (54) and an outer tube limiting assembly (55) inserted at both ends of the limiting guide seat (52) and respectively pressing and engaging with both ends of the elastic pressing member (53), the inner tube limiting assembly (54) and the outer tube limiting assembly (55) being used to move along the length direction of the limiting guide seat (52); The inner tube (1) has an inner tube circumferential limiting groove (11) on its outer side wall for inserting the inner tube limiting component (54), and the outer tube (2) has an outer tube circumferential limiting groove (21) on its inner side wall for inserting the outer tube limiting component (55).

8. The coffee machine steam vacuum tube according to claim 7, characterized in that, Both the inner tube limiting assembly (54) and the outer tube limiting assembly (55) are provided with limiting protrusions (56) on their side walls, and a limiting groove (57) is also provided on one side of the limiting protrusions (56). The inner wall of the limiting guide seat (52) is provided with a guide groove (521) for the insertion of the limiting protrusion (56), and a guide protrusion (522) located on one side of the guide groove (521) for insertion into the limiting groove (57).

9. The coffee machine steam vacuum tube of claim 7, wherein, The spacer body (51) is provided with an air intake receiving groove (511) that communicates with the vacuum cavity (7). The inner tube spacer mechanism (5) also includes an air intake component (58) that is inserted into the air intake receiving groove (511) and extends into the vacuum cavity (7).

10. A method of manufacturing a vacuum steam tube for a coffee machine as claimed in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Connect one end of the inner tube (1) to one end of the first connecting mechanism (3); S2. The multiple inner tube spacer mechanisms (5) and the inner tube spacer elastic members (6) are alternately sleeved on the outer side wall of the inner tube (1), so that the inner tube spacer elastic members (6) are located between two adjacent inner tube spacer mechanisms (5). S3. The outer tube (2) is sleeved on the outside of the inner tube (1) which is equipped with the inner tube spacer mechanism (5) and the inner tube spacer elastic member (6), and the first connecting mechanism (3) is connected to one end of the outer tube (2). S4. Connect one end of the second connecting mechanism (4) to the other end of the inner tube (1), and connect the other end of the second connecting mechanism (4) to the other end of the outer tube (2); at this time, the first connecting mechanism (3), the inner tube (1), the second connecting mechanism (4) and the outer tube (2) together form a closed cavity; S5. Vacuum the cavity to form the vacuum cavity (7).

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