Paint spraying pot
By designing a spray paint pot that includes a sealed inner cover and a replacement second pot body, the existing spray paint pot has been solved and the problem of leakage and cleaning is achieved, and the effect of good sealing and easy operation is achieved.
Patent Information
- Application Number
- CN202421748189.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-23
AI Technical Summary
Existing spray paint pots need to be cleaned when they are used or need to change the paint color, and they are prone to leakage during use, resulting in waste of paint and contamination.
A spray paint pot is designed, which includes a first pot body, a second pot body, an outer cover and an inner cover. The second pot body can be sealed from the inner cover of the first pot body through a snap-on part and a slot or flange to avoid paint leakage. The outer cover and the spray gun are connected through the plug-in, making it easy to operate. When you need to change the paint, you can directly replace the second pot body to avoid cleaning.
The painted pot has good sealing properties, avoids paint leakage and cleaning needs, is convenient to operate, and the second pot body can be replaced as needed, saving time.
Smart Images
Figure CN222956703U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a painting device for containing paint for use by a paint spray gun, and particularly relates to a paint spray pot. Background Art
[0002] The paint spray pot is used to contain paint, and is connected to a spray gun through a joint. Existing paint spray pots generally include a pot body and a pot cover, which are detachably connected. The spray gun is connected to the pot cover through a joint. When in use, the paint in the pot body is pumped out and atomized and sprayed by the external force of the spray gun. When the existing paint spray pot is used up or the paint color needs to be changed, the paint spray pot needs to be cleaned; some paint spray pots are prone to liquid leakage during use, resulting in waste of paint and pollution of painting tools. Summary of the Invention
[0003] In order to solve the deficiencies of the existing technology, the utility model provides a paint spray pot with good sealing performance, no need for cleaning, and convenient disassembly and assembly operations.
[0004] The above invention object of the utility model is achieved through the following technical solutions:
[0005] The utility model provides a paint spray pot, comprising:
[0006] A first pot body, which houses a second pot body, and a clamping portion is formed along the edge of the upper part of the second pot body;
[0007] An outer cover, which is detachably connected to the first pot body, and an outer cover through hole is formed on the outer cover. A plugging portion is arranged on the upper part of the outer cover, and can be detachably connected to the spray gun through the plugging portion;
[0008] An inner cover, which is provided with a liquid outlet, and a spray gun connecting portion is integrally arranged upward along the circumference of the liquid outlet. The spray gun connecting portion passes through and protrudes from the outer cover through hole. A clamping groove or flange is also formed on the inner cover, and the clamping groove or flange is adapted to the clamping portion of the second pot body.
[0009] By adopting the above technical solutions, when in use, the second pot body is placed in the first pot body, and the inner cover is adapted to the clamping portion through the clamping groove or flange, so that a seal is achieved between the inner cover and the second pot body, avoiding paint leakage during use; the spray gun connecting portion of the inner cover passes through the outer cover through hole and is communicated with the spray gun, and is fixedly connected to the spray gun through the plugging portion of the outer cover; when the paint needs to be changed or after painting is completed, the second pot body can be replaced or discarded, without the need for cleaning, saving time and being convenient to operate.
[0010] Furthermore, a plurality of blocking pieces are integrally arranged at the lower part of the inner cover. The blocking pieces are equidistantly arranged along the circumference of the same circle of the inner cover, and the outer diameter of the circle where the blocking pieces are located is smaller than the inner diameter of the clamping groove.
[0011] By adopting the above technical solution, when the inner lid is fitted with the second kettle body, the baffle plate extends deep into the second kettle body, preventing the inner lid from detaching from or moving relative to the second kettle body, and increasing the firmness of the fit between the inner lid and the second kettle body. Further, a plurality of anti-slip rib strips are circumferentially arranged on the outer wall of the spray gun connection part, and the anti-slip rib strips are arranged in parallel with each other.
[0012] By adopting the above technical solution, when the inner lid is connected to the spray gun, the tightness of the fit between the inner lid and the spray gun can be increased.
[0013] Further, the second kettle body includes a second kettle body main body and a clamping part integrally arranged, and an annular platform is arranged between the second kettle body main body and the clamping part.
[0014] By adopting the above technical solution, the maximum outer diameter of the second kettle body main body is the same as the inner diameter of the annular platform, and the outer diameter of the annular platform is the same as the minimum inner diameter of the clamping part. The arrangement of the annular platform makes the clamping part larger than the second kettle body main body. When the second kettle body is fitted with the inner lid, it can accommodate the edge structure of the inner lid and embed it into the second kettle body, further increasing the sealing performance between the second kettle body and the inner lid.
[0015] Further, the insertion part of the outer lid includes an insertion platform and a plurality of plugs. The insertion platform is oval or circular. A jack is opened at the connection between the plug and the insertion platform, and the outer lid through hole is opened at the center position of the insertion platform.
[0016] By adopting the above technical solution, the inner lid passes through the outer lid through hole and is connected to the spray gun. The plug is inserted into the corresponding connection part of the spray gun, and the connection part of the spray gun is inserted into the jack, so that the outer lid and the spray gun are tightly connected.
[0017] Further, the number of plugs is even, and the plugs are equidistantly arranged on the same circumference of the insertion platform.
[0018] Further, an insertion convex is integrally arranged at the upper end of the plug, and a reinforcing rib is integrally arranged on the outside of the plug.
[0019] By adopting the above technical solution, the insertion convex is in interference fit connection with the connection part of the spray gun, and the connection and separation of the outer lid and the spray gun are realized through insertion and extraction. The reinforcing rib enhances the firmness of the plug, so that it will not be deformed during insertion.
[0020] Further, a plurality of upper clamping strips are arranged at the lower part of the outer lid, and a plurality of lower clamping strips are arranged at the upper part of the first kettle body. When the outer lid is connected to the first kettle body, the upper surface of the upper clamping strip abuts against the lower surface of the lower clamping strip.
[0021] By adopting the above technical solution, the upper clamping strip and the lower clamping strip are adapted to each other. Through the above arrangement, the detachable connection between the outer lid and the first kettle body can be realized.
[0022] Further, a plurality of anti-slip portions are provided on the outer edge of the outer cover, and arc-shaped through holes are also formed at the anti-slip portions, and there is one or two of the arc-shaped through holes.
[0023] By adopting the above technical solution, the operation convenience of the detachable connection between the outer cover and the first kettle body can be increased, and the relative positions of the upper clamping strip and the lower clamping strip can also be observed through the arc-shaped through holes.
[0024] Further, a plurality of anti-slip ridges are provided on the anti-slip portion, and the anti-slip ridges are arranged in parallel.
[0025] Further, the first kettle body is in a barrel-shaped structure with a larger upper part and a smaller lower part, an outer cover connection portion is provided on the upper edge of the first kettle body, the outer diameter of the outer cover connection portion is larger than the maximum outer diameter of the first kettle body, and the upper clamping strip is arranged on the outer edge of the outer cover connection portion.
[0026] By adopting the above technical solution, the outer cover connection portion protrudes from the first kettle body, which is convenient for the connection between the first kettle body and the outer cover.
[0027] Further, a bottom viewing window is formed at the bottom of the first kettle body, and a side viewing window is formed on the side wall of the first kettle body.
[0028] By adopting the above technical solution, the bottom viewing window can save materials and reduce the self-weight of the paint spraying kettle, and the remaining amount of paint can be observed through the side viewing window to supplement the paint according to the usage situation.
[0029] In summary, the present utility model includes at least one of the following beneficial technical effects: the inner cover of the paint spraying kettle of the present utility model is tightly connected to the second kettle body and will not leak liquid; the outer cover is conveniently plugged and unplugged with the spray gun, has good sealing performance, and the second kettle body can be replaced according to needs, and the disassembly and assembly are convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 is the overall structure schematic diagram of Embodiment 1;
[0031] Figure 2 is Figure 1 the cross-sectional view taken along line A-A of
[0032] Figure 3 is the overall structure exploded view of Embodiment 1;
[0033] Figure 4 is the structure schematic diagram of the first kettle body of Embodiment 1;
[0034] Figure 5 is the structure schematic diagram of the second kettle body of Embodiment 1;
[0035] Figure 6 is Figure 5Cross-sectional view taken along line B-B;
[0036] Figure 7 is Figure 6 Partial enlarged view at position Ι in;
[0037] Figure 8 Schematic diagram of the inner cover structure of Embodiment 1;
[0038] Figure 9 is Figure 8 Cross-sectional view taken along line C-C;
[0039] Figure 10 Schematic diagram of the outer cover structure of Embodiment 1;
[0040] Figure 11 is Figure 10 Cross-sectional view taken along line D-D;
[0041] Figure 12 Schematic diagram of the outer cover structure of Embodiment 2;
[0042] Figure 13 Another schematic diagram of the outer cover structure of Embodiment 2;
[0043] Figure 14 Schematic diagram of the inner cover structure of Embodiment 2;
[0044] Figure 15 is Figure 14 Cross-sectional view taken along line D-D.
[0045] In the figure, 1 is the first kettle body; 11 is the outer cover connection part; 12 is the upper clamping strip; 13 is the bottom viewing window; 14 is the side viewing window; 2 is the second kettle body; 21 is the second kettle body main body; 22 is the clamping part; 23 is the annular platform; 3 is the outer cover; 30 is the outer cover viewing window; 31 is the outer cover through hole; 32 is the insertion part; 321 is the insertion platform; 322 is the plug; 323 is the socket; 324 is the insertion convex; 325 is the reinforcing rib; 33 is the lower clamping strip; 34 is the anti-slip part; 341 is the anti-slip convex strip; 35 is the arc-shaped through hole; 4 is the inner cover; 41 is the liquid outlet; 42 is the spray gun connection part; 421 is the anti-slip rib; 43 is the card slot; 44 is the baffle; 45 is the flange; 46 is the sealing rib. Detailed implementation manners
[0046] The following further describes the present invention in detail with reference to the accompanying drawings.
[0047] For the convenience of those skilled in the art to understand the present invention, the following describes the specific implementation manners of the present invention with reference to the accompanying drawings.
[0048] Embodiment 1
[0049] Referring to the figures, a paint spraying pot disclosed by the present utility model includes a first pot body 1, a second pot body 2, an outer cover 3 and an inner cover 4.
[0050] The first pot body 1 can be a bucket-shaped structure with a larger upper part and a smaller lower part. An outer cover connection part 11 is integrally provided along the upper part of the first pot body 1. The outer diameter of the outer cover connection part 11 is larger than the maximum outer diameter of the first pot body 1, thus forming an outer edge structure. A plurality of upper clamping strips 12 are provided on the outer cover connection part 11 to facilitate connection with the outer cover 3; a bottom viewing window 13 is opened at the bottom of the first pot body 1 to facilitate observation while reducing the self-weight, and a side viewing window 14 is opened on the side wall of the first pot body 1 to observe the situation of the second pot body 2.
[0051] The second pot body 2 can be accommodated in the first pot body 1. Generally, the second pot body 2 is made of a plastic transparent material. The second pot body 2 includes a second pot body main body 21 and a clamping part 22 integrally provided. The upper part of the second pot body 2 is bent downward along its edge to form the clamping part 22; an annular platform 23 is opened at the connection between the second pot body main body 21 and the clamping part 22.
[0052] The outer cover 3 is detachably connected to the first pot body 1. An outer cover through hole 31 is opened on the outer cover 3, and a plug-in part 32 is provided on the upper part of the outer cover 3. The plug-in part 32 can be detachably connected to a spray gun.
[0053] The outer cover 3 is a hollow frustum shape. The plug-in part 32 includes a plug-in platform 321 and a plurality of plugs 322. A jack 323 is opened at the connection between the plug 322 and the plug-in platform 321. The outer cover through hole 31 is opened at the center position of the plug-in platform 321; in this embodiment, four plugs 322 are provided, and the four plugs 322 are equally spaced on the same circumference of the plug-in platform 321; preferably, an insertion convex 324 is also integrally provided on the upper part of the plug 322, and a reinforcing rib 325 is also provided between the plug 322 and the plug-in platform 321 to increase the stability of the plug 322. During use, the plug 322 is inserted into the connection part of the spray gun, and the plug 322 is in interference fit with the connection part of the spray gun. The connection part of the spray gun can be inserted into the jack 323, so as to realize the plug-and-play connection between the outer cover 3 and the spray gun.
[0054] A plurality of lower clamping strips 33 are provided at the lower part of the outer cover 3. The lower clamping strips 33 are adapted to the upper clamping strips 12 of the first kettle body 1. During use, the outer cover 3 is screwed tightly relative to the first kettle body 1. The upper surface of the upper clamping strip 12 abuts against the lower surface of the lower clamping strip 33. When the outer cover 3 is rotated in the opposite direction, the upper surface of the upper clamping strip 12 is separated from the lower surface of the lower clamping strip 33, and the outer cover 3 is separated from the first kettle body 1. For the convenience of use, a plurality of anti-slip portions 34 are provided at adjacent positions on the outer edge of the outer cover 3. The plurality of anti-slip portions 34 are arranged at equal intervals. In this embodiment, four anti-slip portions are provided. A plurality of anti-slip ridges 341 are provided at the anti-slip portion 34. The plurality of anti-slip ridges 341 are arranged in parallel. An arc-shaped through hole 35 is also formed at the anti-slip portion 34 to facilitate observing the connection state of the upper clamping strip 12 and the lower clamping strip 33.
[0055] A liquid outlet 41 is formed on the inner cover 4. A spray gun connecting portion 42 is integrally provided upward along the circumference of the liquid outlet 41. The spray gun connecting portion 42 passes through and protrudes from the outer cover through hole 31. A clamping groove 43 is also formed on the inner cover 4. The clamping groove 43 is adapted to the clamping portion 22 of the second kettle body 2. Preferably, a plurality of groups of anti-slip rib strips 421 are arranged along the circumference on the outer wall of the spray gun connecting portion 42. The anti-slip rib strips 421 are arranged in parallel with each other. In this embodiment, two groups of anti-slip rib strips 421 are provided. A plurality of baffles 44 are integrally provided at the lower part of the inner cover 4. The baffles 44 are arranged at equal intervals along the circumference of the same circle of the inner cover 4. The outer diameter of the circle where the baffles 44 are located is smaller than the inner diameter of the clamping groove 43. In this embodiment, four baffles 44 are provided. During use, the clamping portion 22 of the second kettle body 2 is adapted to the clamping groove 43 of the inner cover 4 to seal the space between the second kettle body 2 and the inner cover 4. The baffles extend into the second kettle body main body 21 to provide support for the second kettle body 2 and prevent relative movement between the inner cover 4 and the second kettle body 2. The inner cover wall outside the baffles 44 abuts against the annular platform 23 of the second kettle body 2 to further seal the inner cover 4 and the second kettle body 2.
[0056] Embodiment 2
[0057] The paint spraying kettle of the present utility model includes a first kettle body 1, a second kettle body 2, an outer cover 3 and an inner cover 4.
[0058] The first kettle body 1 is in a barrel-shaped structure with a larger upper part and a smaller lower part. An outer cover connecting portion 11 is integrally provided along the upper part of the first kettle body 1. The outer diameter of the outer cover connecting portion 11 is larger than the maximum outer diameter of the first kettle body 1, thereby forming an outer edge structure. A plurality of upper clamping strips 12 are provided on the outer cover connecting portion 11 to facilitate connection with the outer cover 3. A bottom viewing window 13 is formed at the bottom of the first kettle body 1 to facilitate observation while reducing the self-weight. A side viewing window 14 is formed on the side wall of the first kettle body 1 to observe the situation of the second kettle body 2.
[0059] The second pot body 2 can be accommodated in the first pot body 1. Generally, the second pot body 2 is made of a plastic transparent material. The second pot body 2 includes a second pot body main body 21 and a clamping portion 22 which are integrally provided. The upper part of the second pot body 2 is bent downward along its edge to form the clamping portion 22. An annular platform 23 is provided at the connection between the second pot body main body 21 and the clamping portion 22.
[0060] The outer cover 3 is detachably connected to the first pot body 1. An outer cover through hole 31 is provided on the outer cover 3. An insertion portion 32 is provided at the upper part of the outer cover 3. The outer cover 3 can be detachably connected to the spray gun through the insertion portion 32.
[0061] The outer cover 3 is in the shape of a hollow frustum. The cover body of the outer cover 3 can be a solid structure or a hollow outer cover viewing window can be provided on the cover body of the outer cover 3. The insertion portion 32 includes an insertion platform 321 and a plurality of plugs 322. The insertion platform 321 is oval or circular. A jack 323 is provided at the connection between the plug 322 and the insertion platform 321. The outer cover through hole 31 is provided at the center of the insertion platform 321. In this embodiment, two plugs 322 are provided and the two plugs 322 are symmetrically arranged. An insertion protrusion 324 is also integrally provided at the upper part of the plug 322. A reinforcing rib 325 is also provided between the plug 322 and the insertion platform 321 to increase the stability of the plug 322. During use, the plug 322 is inserted into the connection portion of the spray gun, and the plug 322 is in interference fit with the spray gun connection portion 42. The spray gun connection portion 42 can be inserted into the jack 323, thereby realizing the plug-and-play connection between the outer cover 3 and the spray gun.
[0062] A plurality of lower clamping strips 33 are provided at the lower part of the outer cover 3. The clamping strips 33 are adapted to the upper clamping strips 12 of the first pot body 1. During use, the outer cover 3 is tightened relative to the first pot body 1, and the upper surface of the lower clamping strip 33 abuts against the lower surface of the upper clamping strip 12. When the outer cover 3 is rotated in the opposite direction, the lower surface of the upper clamping strip 12 is separated from the upper surface of the lower clamping strip 33, and the outer cover 3 is separated from the first pot body 1. For ease of use, an anti-slip portion 34 is provided at an adjacent position on the outer edge of the outer cover 3. An arc-shaped through hole 35 is also provided at the anti-slip portion 34 to facilitate observing the connection state of the upper clamping strip 12 and the lower clamping strip 33. In this embodiment, two arc-shaped through holes 35 are provided at each anti-slip portion. To adapt to the arc-shaped through holes, the lower clamping strip 33 is provided in a two-piece type.
[0063] The inner cover 4 is provided with a liquid outlet 41. A spray gun connecting portion 42 is integrally provided upward along the circumference of the liquid outlet 41. The spray gun connecting portion 42 passes through and protrudes from the outer cover through hole 31. A flange 45 is provided along the outer circumference of the inner cover 4, and the flange 45 is adapted to the clamping portion 22 of the second pot body 2; a sealing rib 46 is provided along the inner circumference of the inner cover 4. When the inner cover 4 is covered on the second pot body 2, the sealing rib 46 is clamped inside the second pot body 2; a plurality of groups of anti-slip rib strips 421 are provided along the circumference on the outer wall of the spray gun connecting portion 42, and the anti-slip rib strips 421 are arranged in parallel. In this embodiment, two groups of anti-slip rib strips 421 are provided. During use, the clamping portion 22 of the second pot body 2 is adapted to the flange 45 of the inner cover 4 to seal the space between the second pot body 2 and the inner cover 4. The sealing rib 46 strengthens the seal of the second pot body 2 to prevent relative movement between the inner cover 4 and the second pot body 2.
[0064] The implementation principle of this embodiment is as follows: During use, the second pot body 2 is placed into the first pot body 1, paint is injected into the second pot body 2, the inner cover 4 is connected to the second pot body 2, and the clamping portion 22 of the second pot body 2 is adapted to the clamping groove 43 or the flange 45 of the inner cover 4 for sealing. The spray gun connecting portion 42 of the inner cover 4 passes through the outer cover through hole 31, the outer cover 3 is screwed tightly to the first pot body 1, the spray gun connecting portion 42 of the inner cover 4 is communicated with the spray gun, the plugging portion 32 of the outer cover 3 is connected to the spray gun connecting portion 42. After assembly, the spray gun is started, and the paint enters the spray gun through the liquid outlet 41. The good sealing between the second pot body 2 and the inner cover 4 prevents paint leakage. After the spray gun completes the painting operation, the remaining paint volume can be observed through the side window 14 of the first pot body 1, and paint can be replenished as needed; the second pot body 2 can also be replaced according to actual needs without the need for cleaning operation, and the disassembly and assembly are convenient, saving time and effort.
[0065] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0066] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0067] The above-described embodiments of the present utility model do not constitute a limitation to the protection scope of the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.
Claims
1. A paint spray pot, characterized in that: include: A first kettle body (1) contains a second kettle body (2), wherein the upper portion of the second kettle body (2) is formed with a clamping portion (22) along its edge; An outer cover (3), the outer cover (3) being detachably connected to the first kettle body (1), the outer cover (3) being provided with an outer cover through hole (31), and an inserting portion (32) being provided at the upper portion of the outer cover (3), and being detachably connected to the spray gun via the inserting portion (32); and an inner cover (4), on which a liquid outlet (41) is provided, and a spray gun connecting portion (42) is integrally provided along the circumference of the liquid outlet (41) and upwardly extended, the spray gun connecting portion (42) passing through and protruding from the outer cover through hole (31), and the inner cover (4) is also provided with a card slot (43) or a flange (45), and the card slot (43) or the flange (45) is adapted to the card connection portion (22) of the second kettle body (2).
2. A paint spray pot according to claim 1, characterized in that: A plurality of baffles (44) are integrally provided at the lower portion of the inner cover (4), and the baffles (44) are arranged at equal intervals along the same circumference of the inner cover (4), and the circumferential outer diameter of the circumference where the baffles (44) are located is smaller than the inner diameter of the slot (43).
3. A paint spray pot according to claim 1, characterized in that: A plurality of groups of anti-skid ribs (421) are arranged on the outer wall of the spray gun connection portion (42) along its circumference, and the anti-skid ribs (421) are arranged parallel to each other.
4. A paint spray pot according to claim 2, characterized in that: The second kettle body (2) comprises a second kettle body main body (21) and a clamping portion (22) which are integrally arranged, and an annular platform (23) is arranged between the second kettle body main body (21) and the clamping portion (22).
5. A paint spray pot according to claim 1, characterized in that: The plug-in portion (32) of the outer cover (3) comprises a plug-in platform (321) and a plurality of plugs (322); the plug-in platform (321) is oval or circular; a plug hole (323) is provided at the connection between the plug (322) and the plug-in platform (321); and the outer cover through hole (31) is provided at the center of the plug-in platform (321).
6. A paint spray pot according to claim 5, characterized in that: An even number of the plugs (322) are provided, and the plugs (322) are arranged at equal intervals in the circumferential direction of the same circle of the plugging platform (321).
7. A paint spray pot according to claim 5 or 6, characterized in that: An insertion protrusion (324) is integrally provided at the upper end of the plug (322), and a reinforcing rib (325) is integrally provided at the outer side of the plug (322).
8. A paint spray pot according to claim 1, characterized in that: The lower part of the outer cover (3) is provided with a plurality of lower clamping strips (33), and the upper part of the first kettle body (1) is provided with a plurality of upper clamping strips (12). When the outer cover (3) is connected to the first kettle body (1), the upper surface of the upper clamping strip (12) abuts against the lower surface of the lower clamping strip (33).
9. A paint spray pot according to claim 1, characterized in that: A plurality of anti-slip portions (34) are arranged on the outer edge of the outer cover (3), and an arc-shaped through hole (35) is also opened at the anti-slip portion (34), and one or two arc-shaped through holes (35) are arranged.
10. A paint spray pot according to claim 8, characterized in that: The first kettle body (1) is a barrel-shaped structure that is larger at the top and smaller at the bottom. An outer cover connecting portion (11) is provided at the upper edge of the first kettle body (1). The outer diameter of the outer cover connecting portion (11) is larger than the maximum outer diameter of the first kettle body (1). The upper clamping strip (12) is provided on the outer edge of the outer cover connecting portion (11).