Replaceable cream bottle

Abstract

The replaceable cream bottle comprises an outer bottle, a head cap assembly and a replacement assembly, an opening is formed in the top of the outer bottle, the head cap assembly is detachably connected to the opening of the outer bottle and forms a liquid outlet channel, the replacement assembly serves as an integral unit and comprises an inner bottle and a pump core unit arranged at the top of the inner bottle, and the outer diameter of the inner bottle is matched with the size of the opening of the outer bottle. And the bottle can be integrally arranged in the outer bottle or integrally moved out of the outer bottle through the opening. Compared with the prior art, the pump core unit and the inner bottle are integrated into a complete replacement assembly through the modular design, a user only needs to integrally disassemble an old replacement assembly and install a new replacement assembly, the user does not need to make contact with the internal structure of the pump body, replacement can be rapidly completed by a single person, and the operation cost is greatly reduced. Meanwhile, the pollution risk caused by traditional manual pasty fluid digging is avoided through the overall replacement mode, the sanitation advantage of a pumping structure is continued, and resource waste and environmental pollution caused by discarding of the whole bottle are reduced.

Description

Technical Field

[0001] This utility model relates to the field of daily chemical packaging technology, and specifically relates to a replaceable cream bottle. Background Technology

[0002] Cream jars are containers used to hold cream or lotion-like products and are widely used in cosmetics, skincare products, and pharmaceuticals. Early cream jars had an inner liner fixed inside the outer bottle, making them difficult to remove. As a result, the entire bottle was frequently discarded after use, leading to resource waste and environmental pollution.

[0003] To address this issue, replaceable-lined cream jars have emerged, gaining widespread use due to their ease of refilling and reduced packaging costs. However, existing replaceable-lined cream jars typically lack a pumping mechanism, requiring users to manually scoop out the cream, leading to frequent contact with the external environment and posing risks of oxidation and contamination. To solve this hygiene problem, some cream jars have attempted to incorporate a pumping structure. For example, Chinese utility model patent application number 202120413323.9 (authorization announcement number CN215476923U), entitled "A Vacuum Cream Jar," pre-assembles the pump body, cap, and inner liner into a modular unit using a positioning frame, utilizing a vacuum pumping component to achieve press-to-dispense liquid, thus avoiding direct exposure of the cream. However, in this solution, the pump body and the inner liner are rigidly fixed by threads (such as the first vertical part and the second vertical part) and a shoulder limiting structure. When replacing the inner liner, the positioning frame must be disassembled in sequence, the pump body and the old inner liner must be separated and the new module must be reassembled. The operation involves complex steps such as thread alignment and component limiting. Users find it difficult to complete the quick replacement independently, and repeated disassembly and reassembly can easily lead to thread wear or sealing failure.

[0004] In summary, existing pump-equipped cream bottles present a core contradiction when combined with replaceable inner liners: the traditional connection method between the pump and the inner liner leads to a cumbersome replacement process, increasing user operating costs and potentially affecting product performance due to structural damage. Therefore, how to overcome the bottleneck of "convenient replacement of pump-equipped inner liners" while preserving the hygienic advantages of the pumping structure has become a pressing technical challenge for the industry. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a replacement cream bottle that integrates the pump core unit and the inner bottle into a complete replacement unit, thereby realizing the quick disassembly and replacement of the inner bottle with pump, which not only continues the hygienic characteristics of the pumping function, but also simplifies the replacement process.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problem is: a replacement cream bottle, comprising...

[0007] The outer bottle has an opening at the top;

[0008] The cap assembly is detachably connected to the top opening of the outer bottle and forms a liquid outlet channel for conveying materials to the outside.

[0009] The replacement assembly includes an inner bottle and a pump core unit located on top of the inner bottle. The replacement assembly is detachably connected to the bottom of the cap assembly as an integral unit and communicates with the liquid outlet channel to realize the external conveying of materials.

[0010] The outer diameter of the inner bottle is adapted to the opening size of the outer bottle, so that the inner bottle of the replacement component can be inserted into the outer bottle or removed from the outer bottle as a whole through the opening.

[0011] To optimize the structure of the cap assembly, achieve a detachable connection between the cap assembly and the outer bottle, and facilitate the dispensing of liquid from the pump core unit, preferably, the cap assembly includes a cap, a shoulder sleeve, and an inner ring. The shoulder sleeve is detachably fitted onto the top opening of the outer bottle, the inner ring is located inside the shoulder sleeve and is fixedly connected to the shoulder sleeve, and the replacement component is connected to the inner ring.

[0012] The top of the head cap is exposed at the top of the shoulder sleeve and can move upward or downward along the shoulder sleeve axis to a set position. A connecting pipe is formed at the bottom to drive the pump core unit. When the head cap is in the downward state, the liquid outlet channel can be opened through the connecting pipe and the pump core unit can be driven to discharge liquid.

[0013] To optimize the disassembly structure between the shoulder sleeve and the outer bottle, enabling quick installation and locking, preferably, a first connecting surface is formed on the outer periphery of the top opening of the outer bottle, and a second connecting surface is formed on the inner periphery of the shoulder sleeve. The second connecting surface can be fitted over the outer periphery of the first connecting surface from top to bottom. A first disassembly structure is provided between the first and second connecting surfaces. The first disassembly structure includes...

[0014] A snap-fit ​​groove is provided on the first connecting surface. The snap-fit ​​groove includes a guide groove extending vertically and a locking groove extending circumferentially. The top of the guide groove extends to the edge of the opening, and the bottom communicates with the locking groove.

[0015] A snap-fit ​​block is provided on the second connecting surface, the snap-fit ​​block being adapted to the guide groove and the locking groove;

[0016] With the shoulder sleeve slipped onto the outer bottle from top to bottom, the locking block moves down along the guide groove, and by rotating the shoulder sleeve, the locking block engages with the locking groove, thereby achieving a quick lock between the shoulder sleeve and the outer bottle.

[0017] To prevent the locking structure between the shoulder sleeve and the outer bottle from loosening due to external force, preferably, a limiting rib is protruding in the locking groove, and a limiting groove adapted to the limiting rib is provided on the snap-fit ​​block. When the shoulder sleeve rotates to the set position, the limiting rib snaps into the limiting groove to limit the continued rotation of the shoulder sleeve without external force.

[0018] To achieve a more reliable connection and disassembly between the replacement component and the headgear component, preferably, a second disassembly structure is formed between the inner ring and the replacement component, the second disassembly structure including...

[0019] Internal threads formed on the inner ring;

[0020] An external thread located on top of the replacement component and adapted to the internal thread;

[0021] The replacement component can be detachably connected to the bottom of the headgear assembly via the threaded engagement of external and internal threads.

[0022] To avoid structural damage caused by over-tightening of the threads and to prevent the replacement component from loosening in the reverse direction, preferably, a mating plane perpendicular to the rotation center is formed on the inner ring, at least one positioning groove is formed on the mating plane, and a positioning block adapted to the positioning groove is provided at the corresponding position of the replacement component;

[0023] When the replacement component is screwed into the set position by the external and internal threads, the positioning block is embedded in the positioning groove to limit the further rotation of the replacement component relative to the inner ring, thereby preventing the threads from being over-tightened. The snap-fit ​​between the positioning block and the positioning groove can also prevent the replacement component from rotating in the opposite direction and loosening.

[0024] To limit the upward movement of the hood and prevent it from detaching from the shoulder cover, preferably, the top of the shoulder cover has an inwardly extending curtain, and the bottom of the hood has an outwardly extending retaining ring. The retaining ring is adapted to the bottom of the curtain. When the hood moves upward to a set position under the action of external force, the retaining ring abuts against the curtain to prevent the hood from continuing to move upward and detaching from the shoulder cover.

[0025] To optimize the structure of the pump core unit so that it can be more easily installed on the inner bottle and form a complete replacement unit together with the inner bottle, preferably, the pump core unit includes a large ring, a pump body and a connecting sleeve. The large ring is located at the top of the inner bottle, the pump body is installed on the large ring and passes through the large ring vertically, the large ring is provided with an annular wall extending upward, the connecting sleeve is installed on the outer periphery of the annular wall, and the external thread is formed on the outer periphery of the connecting sleeve.

[0026] To simplify the assembly steps of the inner bottle and the pump core unit and quickly achieve material filling of the inner bottle, preferably, the outer periphery of the large ring is formed with a downward-facing fitting groove, and the top edge of the inner bottle is fitted into the fitting groove to achieve a detachable connection with the large ring.

[0027] To improve the hygiene and protection of the product during transportation, storage and replacement, preferably, it also includes an outer protective cover and a replacement sealing cover. The outer protective cover is detachably fitted onto the shoulder cover of the headgear assembly, and the replacement sealing cover is detachably installed on the connecting sleeve of the replacement assembly via a threaded connection.

[0028] With the replacement component in the replacement-ready state, remove the replacement sealing cap to expose the connecting sleeve, and then fix the connecting sleeve to the inner ring of the headgear assembly by threaded connection to complete the replacement of the replacement component.

[0029] Compared with existing technologies, the advantages of this invention are as follows: By designing the replacement component as a detachable module including an inner bottle and a pump core unit, it becomes a complete replaceable unit. Furthermore, by adapting the outer diameter of the inner bottle to the top opening of the outer bottle, the replacement component can be directly inserted into or removed from the outer bottle through the top opening. This overcomes the complex replacement process of traditional pump-equipped cream bottles, which requires disassembling the pump body and inner liner. It also solves the drawbacks of existing technologies, such as the cumbersome operation and easy wear of parts caused by repeatedly disassembling and reassembling the positioning frame when replacing the inner liner. Users only need to disassemble the old replacement component and install the new one, without touching the internal structure of the pump body. A single person can quickly complete the replacement, significantly reducing operating costs. At the same time, the overall replacement mode avoids the contamination risk caused by manually scooping out the cream, maintains the hygiene advantages of the pump structure, and reduces resource waste and environmental pollution caused by discarding the entire bottle. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of this embodiment;

[0031] Figure 2 This is a three-dimensional structural diagram of the replacement component in this embodiment;

[0032] Figure 3 This is a schematic diagram of the exploded three-dimensional structure of this embodiment;

[0033] Figure 4 This is a three-dimensional structural diagram showing the exploded state from another angle in this embodiment;

[0034] Figure 5 This is a cross-sectional structural diagram of this embodiment;

[0035] Figure 6 This is a cross-sectional view of the replacement component after the replacement sealing cap has been applied in this embodiment. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0037] Figures 1-6 The diagram shown is a schematic diagram of this embodiment. The replacement cream bottle in this embodiment mainly includes an outer bottle 1, a cap assembly 2, a replacement assembly 3, a first disassembly structure 4, a second disassembly structure 5, an outer protective cover 6, and a replacement sealing cover 7, etc.

[0038] The following are the detailed structures and connection methods of each component in this embodiment.

[0039] Replacement Component 3 Pre-assembly: Reference Figures 2 to 4 As shown, the replacement component 3 includes an inner bottle 31 and a pump core unit 32. The pump core unit 32 includes a large ring 32a, a pump body 32b, and a connecting sleeve 32c. During pre-assembly, the pump body 32b is first installed at the central through hole of the large ring 32a, ensuring that the pump body 32b passes through the large ring 32a vertically. The large ring 32a extends upward to form an annular wall 32d, and its outer periphery has a downward-facing fitting groove 32e. Next, the connecting sleeve 32c is fitted onto the outer periphery of the annular wall 32d and fixedly connected. The outer periphery of the connecting sleeve 32c is machined with an external thread 5b, and a positioning block 3a is provided on the outer side corresponding to the positioning groove 2c2. Finally, the top edge of the inner bottle 31 is fitted into the fitting groove 32e of the large ring 32a, and a detachable connection is achieved through interference fit or other suitable methods, completing the pre-assembly of the replacement component 3.

[0040] Connecting cap assembly 2 to outer bottle 1: (Refer to) Figures 3 to 4 As shown, the outer bottle 1 is cylindrical with a circular opening 1a at the top, and an annular first connecting surface 1b extending from the outer periphery of the opening. The first disassembly structure 4 includes a snap-fit ​​groove 4a disposed on the outer periphery of the first connecting surface 1b, which consists of a guide groove 4a1 and a locking groove 4a2. The guide groove 4a1 extends vertically along the axial direction of the outer bottle 1, with its top connected to the edge of the opening 1a, and its bottom connected to the locking groove 4a2, which extends circumferentially around the outer bottle 1 and has a protruding limiting rib 4a3.

[0041] The cap assembly 2 includes a cap 2a, a shoulder sleeve 2b, and an inner ring 2c. The shoulder sleeve 2b is detachably fitted onto the top opening 1a of the outer bottle 1, and its inner circumference forms a second connecting surface 2b1, with an annular cover 2b2 extending inward from the top. The first disassembly structure 4 also includes a snap-fit ​​block 4b disposed on the second connecting surface 2b1, which is adapted to the guide groove 4a1 and the locking groove 4a2. The inner ring 2c is a circular piece, fixedly connected to the inside of the shoulder sleeve 2b, and is used to connect the replacement assembly 3. A mating plane 2c1 perpendicular to the rotation center is formed on the inner ring 2c, and at least one positioning groove 2c2 is formed on the mating plane 2c1. The top of the cap 2a is exposed at the top of the shoulder sleeve 2b and can move up or down along the axial direction of the shoulder sleeve 2b. The bottom forms a connecting pipe 2a1 that is driven and connected to the pump core unit 32 and whose outer diameter is adapted to the inner diameter of the insertion hole at the top of the pump body 32b. The top has a liquid outlet end and the liquid outlet channel 21 runs through it. The bottom extends outward to form a retaining ring 2a2 that is adapted to the bottom of the cover curtain 2b2.

[0042] During installation, first, slip the shoulder sleeve 2b onto the top opening 1a of the outer bottle 1 from top to bottom, aligning the locking block 4b with the guide groove 4a1 and sliding it down to the bottom. Then, rotate the shoulder sleeve 2b clockwise to slide the locking block 4b into the locking groove 4a2 until the limiting rib 4a3 engages with the limiting groove 4b1 on the locking block 4b, thus locking the shoulder sleeve 2b to the outer bottle 1. Next, align the connecting tube 2a1 of the cap 2a with the top of the pump body 32b and move it downwards along the axial direction of the shoulder sleeve 2b to insert the connecting tube 2a1 into the insertion hole of the pump body 32b to open the liquid outlet channel 21 and drive the pump core unit 32 to discharge liquid. The cap 2a moves upwards to its limit position when the retaining ring 2a2 abuts against the bottom surface of the cover curtain 2b2, preventing it from detaching.

[0043] Replace component 3 with headgear component 2: See reference Figures 3 to 4 As shown, a second disassembly structure 5 is formed between the inner ring 2c and the replacement component 3. This second disassembly structure 5 includes an internal thread 5a formed on the inner ring 2c and an external thread 5b located on the top of the replacement component 3 and adapted to the internal thread 5a. The connecting sleeve 32c of the pre-assembled replacement component 3 is aligned with the inner ring 2c, causing the external thread 5b to engage with the internal thread 5a and rotate the replacement component 3. When rotated to a set position, the positioning block 3a at the corresponding position of the replacement component 3 will embed into the positioning groove 2c2, restricting further rotation of the replacement component 3 and preventing over-tightening and reverse loosening of the threads. At this time, the top of the pump body 32b of the pump core unit 32 and the connecting pipe 2a1 of the cap 2a are in a dockable state.

[0044] Installation of outer protective cover 6 and replacement sealing cover 7: Refer to Figure 5 and Figure 6As shown, the outer protective cover 6 is a circular cover with a buckle on its inner wall. It is fitted onto the outer circumference of the shoulder sleeve 2b and engages with the outer edge of the shoulder sleeve 2b through the buckle, serving to prevent dust and protect the head cap 2a. When the replacement component 3 is not installed into the inner ring 2c, the replacement sealing cover 7 is a circular cover with an internal thread on its inner circumference. It is fitted into the top of the connecting sleeve 32c by adapting to the external thread 5b of the connecting sleeve 32c, sealing it to prevent material leakage or contamination inside the replacement component 3.

[0045] The replacement principle of the cream bottle in this embodiment is as follows:

[0046] 1. To remove the old replacement component 3, first, pull up the outer protective cover 6 to separate it from the shoulder cover 2b. For details, please refer to [link / reference needed]. Figure 1 As shown. Then, rotate the shoulder sleeve 2b counterclockwise, causing the snap-fit ​​block 4b to slide out of the locking groove 4a2 and move upward along the guide groove 4a1, thus removing the cap assembly 2 from the outer bottle 1. Next, rotate the old replacement assembly 3 counterclockwise, causing the external thread 5b to separate from the internal thread 5a, while the positioning block 3a disengages from the positioning groove 2c2, thus removing the old replacement assembly 3 entirely from the inner ring 2c.

[0047] 2. Installation of the new replacement component 3: Remove the replacement sealing cap 7 from the new replacement component 3. At this time, the connecting sleeve 32c is exposed. Refer to [link / reference needed] for details. Figure 2 As shown. Align the connecting sleeve 32c of the new replacement component 3 with the inner ring 2c, so that the external thread 5b engages with the internal thread 5a, and rotate the replacement component 3 until the positioning block 3a is embedded in the positioning groove 2c2, thus completing the connection between the new replacement component 3 and the cap component 2.

[0048] Next, the cap assembly 2 is reinstalled on the outer bottle 1 via the first disassembly structure 4 of the shoulder sleeve 2b and the outer bottle 1. Specifically, the locking block 4b moves down along the guide groove 4a1 and rotates to engage with the locking groove 4a2, while the limiting rib 4a3 engages with the limiting rib 4b1. Finally, the outer protective cover 6 is fitted onto the shoulder sleeve 2b, completing the replacement process of the replacement assembly 3. The entire replacement process requires no complex tools or operations, allowing users to easily and quickly replace the pump-equipped inner bottle while maintaining the hygienic characteristics of the pumping function. During operation, the shoulder sleeve 2b and the outer bottle 1 achieve quick locking through guidance and rotation. The replacement assembly 3 and the inner ring 2c are engaged via threaded positioning. The cap 2a, through the retaining ring 2a2 and the cover curtain 2b2, restricts the stroke, enabling rapid liquid dispensing by pressing.

[0049] It should be noted that in the description of this embodiment, the terms "front," "rear," "left," "right," "inner," "outer," "upper," and "lower," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are used merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A replacement cream bottle, characterized in that: include The outer bottle (1) has an opening (1a) at its top; The cap assembly (2) is detachably connected to the top opening (1a) of the outer bottle (1) and forms a liquid outlet channel (21) for conveying materials to the outside. The replacement component (3) includes an inner bottle (31) and a pump core unit (32) located on top of the inner bottle (31). The replacement component (3) is detachably connected to the bottom of the cap assembly (2) as an integral unit and communicates with the liquid outlet channel (21) to realize the external conveying of materials. The outer diameter of the inner bottle (31) is adapted to the opening (1a) of the outer bottle (1), so that the inner bottle (31) of the replacement component (3) can be inserted into the outer bottle (1) or removed from the outer bottle (1) as a whole through the opening (1a).

2. The refill cream jar of claim 1, wherein: The headgear assembly (2) includes a headgear (2a), a shoulder sleeve (2b), and an inner ring (2c). The shoulder sleeve (2b) is detachably fitted onto the top opening (1a) of the outer bottle (1). The inner ring (2c) is located inside the shoulder sleeve (2b) and is fixedly connected to the shoulder sleeve (2b). The replacement assembly (3) is connected to the inner ring (2c). The top of the cap (2a) is exposed on the top of the shoulder sleeve (2b) and can move upward or downward along the shoulder sleeve (2b) to a set position. A connecting pipe (2a1) is formed at the bottom to drive the pump core unit (32). When the cap (2a) is in the downward state, the liquid outlet channel (21) can be opened through the connecting pipe (2a1) and the pump core unit (32) can be driven to discharge liquid.

3. The refill cream jar of claim 2, wherein: The outer bottle (1) has a first connecting surface (1b) formed on the outer periphery of the top opening (1a), and the shoulder sleeve (2b) has a second connecting surface (2b1) formed on the inner periphery. The second connecting surface (2b1) can be fitted onto the outer periphery of the first connecting surface (1b) from top to bottom. A first disassembly structure (4) is provided between the first connecting surface (1b) and the second connecting surface (2b1). The first disassembly structure (4) includes... A snap-fit ​​groove (4a) is provided on the first connecting surface (1b). The snap-fit ​​groove (4a) includes a guide groove (4a1) extending vertically and a locking groove (4a2) extending circumferentially. The top of the guide groove (4a1) extends to the edge of the opening (1a), and the bottom communicates with the locking groove (4a2). A snap-fit ​​block (4b) is provided on the second connecting surface (2b1), the snap-fit ​​block (4b) being adapted to the guide groove (4a1) and the locking groove (4a2); With the shoulder sleeve (2b) inserted into the outer bottle (1) from top to bottom, the snap-fit ​​block (4b) moves down along the guide groove (4a1) and is snapped into the locking groove (4a2) by rotating the shoulder sleeve (2b), so as to achieve quick locking between the shoulder sleeve (2b) and the outer bottle (1).

4. The refill cream jar of claim 3, wherein: The locking groove (4a2) is provided with a limiting rib (4a3) protruding inside, and the snap-fit ​​block (4b) is provided with a limiting groove (4b1) adapted to the limiting rib (4a3). When the shoulder sleeve (2b) is rotated to the set position, the limiting rib (4a3) is snapped into the limiting groove (4b1) to limit the continued rotation of the shoulder sleeve (2b) without the action of external force.

5. The refill cream jar of claim 2, wherein: A second disassembly structure (5) is formed between the inner ring (2c) and the replacement component (3), the second disassembly structure (5) including An internal thread (5a) is formed on the inner ring (2c); An external thread (5b) is provided on the top of the replacement component (3) and is adapted to the internal thread (5a); The replacement component (3) can be detachably connected to the bottom of the headgear component (2) through the threaded engagement of the external thread (5b) and the internal thread (5a).

6. The refill cartridge of claim 5, wherein: The inner ring (2c) also has a docking plane (2c1) perpendicular to the rotation center, and at least one positioning groove (2c2) is formed on the docking plane (2c1). The replacement component (3) is provided with a positioning block (3a) adapted to the positioning groove (2c2) at the corresponding position. When the replacement component (3) is screwed into the set position by the external thread (5b) and the internal thread (5a), the positioning block (3a) is embedded in the positioning groove (2c2) to limit the further rotation of the replacement component (3) relative to the inner ring (2c), thereby preventing the thread from being over-tightened. The snap-fit ​​between the positioning block (3a) and the positioning groove (2c2) can also prevent the replacement component (3) from rotating out in the opposite direction.

7. The refill cartridge of claim 2, wherein: The top of the shoulder cover (2b) has an inwardly extending curtain (2b2), and the bottom of the headgear (2a) has an outwardly extending retaining ring (2a2). The retaining ring (2a2) is adapted to the bottom of the curtain (2b2). When the headgear (2a) moves upward to a set position under the action of external force, the retaining ring (2a2) abuts against the curtain (2b2) ​​to prevent the headgear (2a) from moving upward and detaching from the shoulder cover (2b).

8. The refill cartridge of claim 5, wherein: The pump core unit (32) includes a large ring (32a), a pump body (32b), and a connecting sleeve (32c). The large ring (32a) is located at the top of the inner bottle (31). The pump body (32b) is mounted on the large ring (32a) and extends vertically through the large ring (32a). The large ring (32a) has an annular wall (32d) extending upward. The connecting sleeve (32c) is mounted on the outer periphery of the annular wall (32d). The external thread (5b) is formed on the outer periphery of the connecting sleeve (32c).

9. The refill cartridge of claim 8, wherein: The outer periphery of the large ring (32a) is formed with a groove (32e) with the opening (1a) facing downwards, and the top edge of the inner bottle (31) is fitted into the groove (32e) to achieve a detachable connection with the large ring (32a).

10. The refill according to any one of claims 1 to 9, characterized in that: It also includes an outer protective cover (6) and a replacement sealing cover (7). The outer protective cover (6) is detachably fitted onto the shoulder sleeve (2b) of the headgear assembly (2), and the replacement sealing cover (7) is detachably installed on the connecting sleeve (32c) of the replacement assembly (3) via a threaded connection. With the replacement component (3) in the replacement-ready state, remove the replacement sealing cap (7) to expose the connecting sleeve (32c), and fix the connecting sleeve (32c) to the inner ring (2c) of the head cap assembly (2) by threaded connection to complete the replacement of the replacement component (3).

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