CN213046454U - Layered storage device - Google Patents

Abstract

The utility model relates to the technical field of storage devices, and discloses a layered storage device, which comprises an upper plate, a lower plate and a rotating shaft; the upper disc and the lower disc are sequentially sleeved on the rotating shaft from top to bottom, the upper disc is movably connected with the rotating shaft, and the lower disc and the rotating shaft are relatively fixedly arranged; the upper disc is provided with an inner side wall facing the rotating shaft, a positioning column is arranged on the inner side wall of the upper disc, and the rotating shaft is provided with a limiting groove with an upward opening; when the upper tray is in a closed state, the bottom of the upper tray is abutted against the top of the lower tray; when the upper disc moves upwards, the bottom of the upper disc is separated from the top of the lower disc, the rotating shaft rotates, the rotating shaft drives the lower disc to rotate, the upper disc is loosened, the upper disc falls down until the positioning column is embedded into the limiting groove, and at the moment, the layered storage device is in an open state; the use space is increased, but the redundant space is not occupied, and the storage effect is better; and when the upper disc is moved upwards, the rotating shaft rotates, and the upper disc and the lower disc are arranged in a staggered manner, so that a user can conveniently take the articles placed on the lower disc, and the device is convenient, practical and ingenious.

Description

Layered storage device

Technical Field

The utility model relates to a storage device's technical field, in particular to layer-stepping storage device.

Background

Regardless of China or abroad, the fruit tray is necessary for every family, and generally a plurality of placing areas for placing articles are arranged on the fruit tray, so that various small articles of different types, such as various dried fruits and small snacks, can be conveniently placed in a classified manner; when a guest comes from a home, the guest needs to be prepared with snacks, and various snacks are classified and placed in each placing area for the guest to enjoy.

The fruit tray in the prior art is composed of a tray body internally provided with a plurality of placing sections, snacks are directly placed in the placing sections, but the types of snacks which can be placed are reduced due to too few placing sections of the fruit tray, and the situation that the fruit tray is not placed enough often occurs.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a layer-stepping storage device aims at solving prior art, and storage device accomodates the not good problem of effect.

The layered storage device comprises an upper disc, a lower disc and a rotating shaft; the upper disc and the lower disc are sequentially sleeved on the rotating shaft from top to bottom, the upper disc is movably connected with the rotating shaft, and the lower disc and the rotating shaft are relatively and fixedly arranged; the upper disc is provided with an inner side wall facing the rotating shaft, a positioning column is arranged on the inner side wall of the upper disc, and the rotating shaft is provided with a limiting groove with an upward opening; when the upper tray is in a closed state, the bottom of the upper tray is abutted against the top of the lower tray; when the upper disc moves upwards, the bottom of the upper disc is separated from the top of the lower disc, the rotating shaft rotates, the rotating shaft drives the lower disc to rotate, the upper disc is loosened, the upper disc falls down until the positioning column is embedded into the limiting groove, and at the moment, the layered storage device is in an open state.

Further, the rotating shaft comprises an upper shaft and a lower shaft, and the upper shaft and the lower shaft are in up-down butt joint arrangement; the outer surface of the upper shaft is provided with a plurality of first limiting parts and a plurality of second limiting parts, and the plurality of first limiting parts and the plurality of second limiting parts are arranged around the outer surface of the upper shaft in a staggered mode at intervals; a first slot position with a downward opening is formed between the first limiting part and the second limiting part positioned on one side of the first limiting part, and a second slot position with a downward opening is formed between the first limiting part and the second limiting part positioned on the other side of the first limiting part; the outer surface of the lower shaft is provided with a plurality of supporting parts which are arranged around the outer surface of the lower shaft at intervals, the limiting groove is formed in the supporting parts, and the limiting groove is arranged opposite to the second limiting part; the positioning columns are multiple and are arranged around the inner side wall of the upper disc at intervals; when the upper disc is moved upwards, the positioning column moves into the first groove, after the upper disc is loosened, the positioning column moves into the limiting groove, and at the moment, the upper disc is fixed in position.

Furthermore, the first limiting part is provided with a first guide surface facing the first slot position, and the first guide surface extends upwards in an inclined manner towards the center of the first slot position; when the positioning column moves into the first groove, the positioning column is abutted against the first guide surface, the upper disc continues to move upwards, the rotating shaft rotates, the rotating shaft drives the lower disc to rotate, and after the upper disc is loosened, the positioning column slides into the limiting groove along the side wall of the limiting groove.

Furthermore, one side of spacing groove extends upwards and is formed with the guide part, the guide part is close to one side of spacing groove forms the spigot surface, the spigot surface is along keeping away from the direction of spacing groove extends that inclines upwards, the guide part with first trench is just to arranging.

Furthermore, the second limiting part is provided with a second guide surface facing the second slot position, the second guide surface extends upwards in an inclined manner along the direction of the middle part of the second slot position, and the second guide surface is arranged opposite to the limiting slot; when the positioning column is arranged in the limiting groove, the upper disc is moved upwards, the positioning column abuts against the second guiding surface, the upper disc is continuously moved upwards, the rotating shaft rotates, the rotating shaft drives the lower disc to rotate, the upper disc is loosened, and the upper disc moves downwards until the bottom of the upper disc abuts against the top of the lower disc.

Furthermore, a plurality of groove strips which correspond to the positioning columns one to one are arranged on the lower shaft, the groove strips are longitudinally arranged and are positioned between the two supporting parts, the positioning columns are embedded into the groove strips, and the groove strips are opposite to the first guide surfaces; when the upper disc is moved upwards, the positioning column moves along the length direction of the groove strip.

Further, the lower end of the lower shaft is fixed with the lower disc, the lower end of the lower shaft is provided with a lower butt joint section, the diameter of the lower butt joint section is smaller than that of the lower end of the lower shaft, and the groove strip is formed in the lower butt joint section; the lower end of the upper shaft is provided with an upper butt joint section, the diameter of the upper butt joint section is the same as that of the lower butt joint section, the upper butt joint section and the lower butt joint section are arranged in an up-down butt joint mode, and the groove strip extends from the lower butt joint section to the upper butt joint section; when the upper disc is moved upwards, the positioning column is moved upwards to the upper shaft along the groove strip.

Further, the upper disc and the lower disc are petal-shaped, and when the layered storage device is in a closed state, the peripheries of the upper disc and the lower disc are arranged in a one-to-one correspondence manner; when the layered storage device is in an open state, the upper tray and the lower tray are arranged in a staggered manner.

Furthermore, the layered storage device comprises an upper cover used for covering the upper disc, and the inner side wall of the upper cover extends upwards to form an upper extending section; the upper cover is provided with a connecting hole, an inner sealing ring is arranged on the inner wall of the connecting hole, the upper cover is provided with a downward lower surface, and an outer sealing ring is arranged around the periphery of the lower surface of the upper cover; the upper cover is sleeved on the upper extension section through the connecting hole, at the moment, the inner sealing ring is attached to the outer surface of the upper extension section, and the outer sealing ring is attached to the outer surface of the upper disc.

Further, the layered storage device comprises a chassis, and the chassis is movably connected with the bottom of the lower disc; the chassis is provided with an upward upper surface, and a plurality of steel balls are movably arranged on the upper surface; when the lower disc rotates, the bottom of the lower disc drives the steel balls to roll.

Compared with the prior art, the layered storage device provided by the utility model has the advantages that when the layered storage device is in a closed state, the upper disc and the lower disc are stacked to form a whole, and can be used as a layer at the moment, namely, the upper disc is used, when the layered storage device needs to be opened for use, the upper disc is moved upwards, so that the upper disc and the lower disc can be separated to form an upper disc and a lower disc, and at the moment, the upper disc and the lower disc can be used, so that the use space is increased, but the redundant space cannot be occupied, and the storage effect is better; and when the upper disc is moved upwards, the rotating shaft rotates, and the upper disc and the lower disc are arranged in a staggered manner, so that a user can conveniently take the articles placed on the lower disc, and the device is convenient, practical and ingenious.

Drawings

Fig. 1 is a schematic perspective view of a layered storage apparatus provided in an embodiment of the present invention in a closed state;

fig. 2 is a schematic top view of a layered storage apparatus according to an embodiment of the present invention in an open state;

fig. 3 is a schematic perspective view of a layered storage apparatus according to an embodiment of the present invention in an open state;

fig. 4 is a schematic perspective view of an upper plate provided by an embodiment of the present invention;

fig. 5 is a schematic perspective view of a bottom wall provided in an embodiment of the present invention;

fig. 6 is an enlarged schematic view of a point a in fig. 5 according to an embodiment of the present invention;

fig. 7 is a schematic perspective view of an upper shaft according to an embodiment of the present invention;

fig. 8 is a schematic perspective view of an upper cover according to an embodiment of the present invention;

fig. 9 is a schematic perspective view of a chassis according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but it is not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and those skilled in the art can understand the specific meanings of the terms according to specific situations.

The following describes the implementation of the present invention in detail with reference to specific embodiments.

Referring to fig. 1-9, preferred embodiments of the present invention are provided.

The layered storage device is generally used for placing dry fruits and other small articles and comprises an upper cover 3, an upper plate 5, a lower plate 6, a rotating shaft and a base plate 4, wherein in the embodiment, the upper cover 3, the upper plate 5 and the lower plate 6 are arranged in a petal shape, and the number of petals of the upper cover 3, the upper plate 5 and the lower plate 6 is the number of storage cavities for storing articles, and the upper cover 3, the upper plate 5 and the lower plate 6 are sequentially arranged downwards along the longitudinal direction; the rotating shaft comprises an upper shaft 2 and a lower shaft 1, the upper shaft 2 and the lower shaft 1 are in up-down butt joint arrangement, an upper disc 5 is sleeved on the upper shaft 2, and a lower disc 6 is sleeved on the lower shaft 1; the outer surface of the upper shaft 2 is provided with a plurality of first limiting parts 20 and a plurality of second limiting parts 23, the plurality of first limiting parts 20 and the plurality of second limiting parts 23 are arranged around the outer surface of the upper shaft 2 in a staggered mode at intervals, and the width areas of the first limiting parts 20 and the second limiting parts 23 are gradually reduced from top to bottom; a first slot position 22 with a downward opening is formed between the first limiting part 20 and a second limiting part 23 positioned on one side of the first limiting part 20, and a second slot position 25 with a downward opening is formed between the first limiting part 20 and the second limiting part 23 positioned on the other side of the first limiting part 20; the first limiting part 20 is provided with a first guide surface 21 facing the first slot position 22, and the first guide surface 21 extends upwards in an inclined manner towards the center of the first slot position 22; upper disk 5 has the inside wall with upper shaft 2 butt on the upper disk 5, and the upper and lower both ends of the inside wall of upper disk 5 extend down up respectively, form and extend section 50 and lower extension 51, are equipped with a plurality of reference columns 52 on the inside wall of lower extension 51, and a plurality of reference columns 52 interval is arranged around the inner wall of lower extension 51, is equipped with a plurality of spacing grooves 12 on the lower shaft 1, and the quantity of spacing groove 12 is unanimous with the quantity of reference column 52.

When the device is in a closed state, the bottom of the upper disc 5 is abutted against the top of the lower disc 6, each petal of the upper disc 5 corresponds to each petal of the lower disc 6 one by one, and the lower disc 6 is closed by the upper disc 5; when the layered storage device needs to be opened, the upper disc 5 moves upwards to separate the bottom of the upper disc 5 from the top of the lower disc 6 until the positioning column 52 moves upwards into the first groove 22 and abuts against the first guide surface 21, and then moves upwards continuously to press the first guide surface 21 to force the rotating shaft to rotate.

The outer surface of the lower shaft 1 is provided with a plurality of supporting parts 10, the supporting parts 10 are arranged at intervals around the outer surface of the lower shaft 1, the end parts of the supporting parts 10 are recessed downwards to form limiting grooves 12 with upward openings, the limiting grooves 12 are arranged opposite to the second limiting parts 23, one sides of the limiting grooves 12 extend upwards to form guiding parts 10, one sides of the guiding parts 10, which are close to the limiting grooves 12, form guiding surfaces 11, the guiding surfaces 11 extend upwards in an inclined mode along the direction far away from the limiting grooves 12, and the guiding parts 10 are arranged opposite to the first groove positions 22; further, the upper disc 5 is provided with an inner side wall abutted against the upper shaft 2, the inner side wall of the upper disc 5 is provided with a plurality of positioning pillars 52 arranged at intervals in a surrounding manner, the lower shaft 1 is provided with a plurality of groove strips 27 corresponding to the positioning pillars 52 one by one, the groove strips 27 are arranged longitudinally, the groove strips 27 are positioned between the two supporting parts 10, the positioning pillars 52 are embedded into the groove strips 27, and the groove strips 27 are opposite to the first guide surfaces 21; move up hanging dish 5 to make the lower wall 6 rotatory back, loosen hanging dish 5, at this moment hanging dish 5 whereabouts, reference column 52 also just butt the spigot surface 13 of guide part 10, and slide down along the cambered surface of spigot surface 13, get into spacing groove 12, at this moment, hanging dish 5 fixed in position, layered storage device is in the open mode, user convenient to use.

In the present embodiment, the rotation angle of the rotating shaft is adjusted according to the number of petals, i.e. the inclination of the first guiding surface is adjusted, and correspondingly, the number of the supporting portions 10, the positioning posts 52 and the number of the groove strips 27 are adjusted at the same time, for example, when the upper disc 5 and the lower disc 6 are 3 petals, the offset angle is 60 °, in this case, there are 3 supporting portions 10, 3 groove strips 27, and 3 positioning posts 52 spaced around the inner side wall of the lower section 51; when the petals are 4, the staggered angle is 45 degrees, 4 supporting parts 10 are arranged around the lower shaft 1 at intervals, 4 groove strips 27 are arranged, and 4 positioning columns 52 are arranged around the inner side wall of the lower extension 51 at intervals; when the angle of the support is 36 degrees when the support is 5 petals, 5 support parts 10 are arranged around the lower shaft 1 at intervals, 5 groove strips 27 are arranged, and 5 positioning columns 52 are arranged around the inner side wall of the lower extension 51 at intervals; by analogy, the upper disc 5 is guaranteed to move upwards, the petals on the upper disc 5 and the petals on the lower disc 6 are staggered after the rotating shaft drives the lower disc 6 to rotate, even if the petals of the lower disc 6 are opposite to the positions between the two petals of the upper disc 5, the articles can be placed on the lower disc 6 conveniently, and a user can take the articles placed on the lower disc 6 conveniently.

Further, the second limiting portion 23 is provided with a second guide surface 24 facing the second slot 25, the second guide surface 24 extends obliquely upward along the direction of the middle of the second slot 25, and the second guide surface 24 is arranged opposite to the limiting slot 12; when the layered storage device is required to be closed in an open state, namely when the positioning column 52 is placed in the limiting groove 12, the upper disc 5 is moved upwards, the positioning column 52 leaves the limiting groove 12 at the moment, the positioning column 52 abuts against the second guide surface 24, the upper disc 5 continues to be moved upwards, the positioning column 52 abuts against the second guide surface 24, the rotating shaft is forced to rotate, the rotating shaft drives the lower disc 6 to rotate again, and therefore the petals of the upper disc 5 and the petals of the lower disc 6 are in one-to-one symmetry, when the positioning column 52 enters the second groove 25, the upper disc 5 can be loosened, the upper disc 5 automatically moves downwards until the bottom of the upper disc 5 abuts against the top of the lower disc 6, and at the moment, the lower disc 6 is covered by the upper disc 5.

According to the layered storage device, when the layered storage device is in a closed state, the upper disc 5 and the lower disc 6 are stacked to form a whole, and at the moment, the layered storage device can be used as one layer, namely, the upper layer is used, when the layered storage device needs to be opened for use, the upper disc 5 is moved upwards, so that the upper disc 5 and the lower disc 6 can be separated to form an upper disc and a lower disc, and at the moment, the upper disc 5 and the lower disc 6 can be used, so that the use space is increased, but no redundant space is occupied, and the storage effect is better; and when the upper disc 5 is moved upwards, the rotating shaft rotates, and the upper disc 5 and the lower disc 6 are arranged in a staggered manner, so that a user can conveniently take articles placed on the lower disc 6, and the device is convenient, practical and ingenious.

Further, the lower end of the lower shaft 1 is fixed with the lower disc 6, the lower end of the lower shaft 1 is provided with a lower butt joint section, the diameter of the lower butt joint section is smaller than that of the lower end of the lower shaft 1, and the groove strip 27 is formed in the lower butt joint section; the lower end of the upper shaft 2 is provided with an upper butt joint section 26, the diameter of the upper butt joint section 26 is the same as that of the lower butt joint section, the upper butt joint section 26 and the lower butt joint section are arranged in an up-down butt joint mode, the groove strips 27 extend to the upper butt joint section 26 from the lower butt joint section, and when the upper disc 5 is moved upwards, the positioning columns 52 can be guaranteed to smoothly move upwards to the upper shaft 2 along the groove strips 27 and enter the first groove positions 22.

In the closed state, the lower extension 51 is embedded between the inner side wall of the lower disc 6 and the lower butt section of the lower shaft 1; the end part of the upper extension section 50 is connected with a connecting section 7, the upper cover 3 is provided with a connecting hole 30, the inner wall of the connecting hole 30 is provided with an inner sealing ring 31, the upper cover 3 is provided with a downward lower surface 32, and the outer periphery of the lower surface 32 of the upper cover 3 is provided with an outer sealing ring 33 in a surrounding manner; the upper cover 3 is sleeved on the upper extension section 50 through the connecting hole 30, at the moment, the inner sealing ring 31 is tightly attached to the outer surface of the upper extension section 50, the outer sealing ring 33 is tightly attached to the outer surface of the upper disc 5, the whole upper disc 5 is sealed through the inner sealing ring 31 and the outer sealing ring 33, the upper disc 5 is dustproof and moistureproof, the bottom of the upper disc 5 is abutted to cover the lower disc 6, and the lower disc 6 is sealed through the upper disc 5, so that the whole seal is dustproof.

The upper cover 3 is sleeved on the connecting section 7, the sealing layer 31 is embedded into the groove ring 70, a layer of sealing layer 31 is arranged on the periphery of the upper cover 3, after the cover is covered, the sealing layer 31 can play a sealing role on the periphery and can play a moisture-proof role, when the upper cover 3 is covered, the upper disc 5 cannot move upwards under the blocking of the upper cover 3, and the upper disc 5 can move upwards after the upper cover 3 is taken down.

Further, the layered storage device comprises a chassis 4, the chassis 4 is in butt joint with the bottom of the lower disc 6, the chassis 4 is provided with an upward upper surface 40, and the upper surface 40 is provided with a plurality of steel balls 41, so that friction between the chassis and the lower disc 5 can be reduced; when the lower disc 6 rotates, the bottom of the lower disc 6 drives the steel balls 41 to roll, so that the lower disc 6 and the chassis 4 rotate relatively, friction and noise are reduced, and the rotation is smooth; the base plate 4 can rotate relative to the upper plate 5, the lower plate 6, the rotating shaft and the upper cover 3, so that users at different positions can take articles in the containing cavity 8 conveniently, the use is convenient, and better experience is brought to the users; and the bottom of the chassis 4 is covered with the non-slip mat, so that the friction between the chassis 4 and the ground or a table is increased, and the layered storage device is always stably arranged on the table in the use process.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. The layered storage device is characterized by comprising an upper disc, a lower disc and a rotating shaft; the upper disc and the lower disc are sequentially sleeved on the rotating shaft from top to bottom, the upper disc is movably connected with the rotating shaft, and the lower disc and the rotating shaft are relatively and fixedly arranged; the upper disc is provided with an inner side wall facing the rotating shaft, a positioning column is arranged on the inner side wall of the upper disc, and the rotating shaft is provided with a limiting groove with an upward opening; when the upper tray is in a closed state, the bottom of the upper tray is abutted against the top of the lower tray; when the upper disc moves upwards, the bottom of the upper disc is separated from the top of the lower disc, the rotating shaft rotates, the rotating shaft drives the lower disc to rotate, the upper disc is loosened, the upper disc falls down until the positioning column is embedded into the limiting groove, and at the moment, the layered storage device is in an open state.

2. The tiered storage device of claim 1 wherein the rotating shaft includes an upper shaft and a lower shaft, the upper shaft and the lower shaft being in an up-down abutting arrangement; the outer surface of the upper shaft is provided with a plurality of first limiting parts and a plurality of second limiting parts, and the plurality of first limiting parts and the plurality of second limiting parts are arranged around the outer surface of the upper shaft in a staggered mode at intervals; a first slot position with a downward opening is formed between the first limiting part and the second limiting part positioned on one side of the first limiting part, and a second slot position with a downward opening is formed between the first limiting part and the second limiting part positioned on the other side of the first limiting part; the outer surface of the lower shaft is provided with a plurality of supporting parts which are arranged around the outer surface of the lower shaft at intervals, the limiting groove is formed in the supporting parts, and the limiting groove is arranged opposite to the second limiting part; the positioning columns are multiple and are arranged around the inner side wall of the upper disc at intervals; when the upper disc is moved upwards, the positioning column moves into the first groove, after the upper disc is loosened, the positioning column moves into the limiting groove, and at the moment, the upper disc is fixed in position.

3. The tiered storage device of claim 2 wherein the first stop portion has a first guide surface facing the first slot, the first guide surface extending obliquely upward toward a center of the first slot; when the positioning column moves into the first groove, the positioning column is abutted against the first guide surface, the upper disc continues to move upwards, the rotating shaft rotates, the rotating shaft drives the lower disc to rotate, and after the upper disc is loosened, the positioning column slides into the limiting groove along the side wall of the limiting groove.

4. The tiered storage device of claim 2 wherein a guide portion extends upwardly from one side of the slot, a guide surface extends upwardly from a side of the guide portion adjacent to the slot, the guide surface extends obliquely in a direction away from the slot, and the guide portion is disposed opposite to the first slot.

5. The tiered storage device of claim 2 wherein the second stop portion has a second guide surface facing the second slot portion, the second guide surface extending obliquely upward in a direction toward a middle of the second slot portion, the second guide surface being disposed opposite the stop slot; when the positioning column is arranged in the limiting groove, the upper disc is moved upwards, the positioning column abuts against the second guiding surface, the upper disc is continuously moved upwards, the rotating shaft rotates, the rotating shaft drives the lower disc to rotate, the upper disc is loosened, and the upper disc moves downwards until the bottom of the upper disc abuts against the top of the lower disc.

6. The tiered storage device of claim 3 wherein said lower shaft has a plurality of slots therein in one-to-one correspondence with said positioning posts, said slots being longitudinally disposed, said slots being between said two support portions, said positioning posts being embedded in said slots, said slots facing said first guide surface; when the upper disc is moved upwards, the positioning column moves along the length direction of the groove strip.

7. The tiered storage device of claim 6 wherein a lower end of the lower shaft is secured to the lower tray, the lower end of the lower shaft having a lower abutment section having a diameter smaller than a diameter of the lower end of the lower shaft, and the channel bars being formed in the lower abutment section; the lower end of the upper shaft is provided with an upper butt joint section, the diameter of the upper butt joint section is the same as that of the lower butt joint section, the upper butt joint section and the lower butt joint section are arranged in an up-down butt joint mode, and the groove strip extends from the lower butt joint section to the upper butt joint section; when the upper disc is moved upwards, the positioning column is moved upwards to the upper shaft along the groove strip.

8. The tiered storage device of any one of claims 1 to 5 wherein the upper and lower trays are petal-shaped, the outer peripheries of the upper trays and the outer peripheries of the lower trays being arranged in one-to-one correspondence when the tiered storage device is in a closed state; when the layered storage device is in an open state, the upper tray and the lower tray are arranged in a staggered manner.

9. The tiered storage device of claim 7 wherein the tiered storage device includes a top cover for covering the top tray, an inner sidewall of the top cover extending upwardly to form an upper extension section; the upper cover is provided with a connecting hole, an inner sealing ring is arranged on the inner wall of the connecting hole, the upper cover is provided with a downward lower surface, and an outer sealing ring is arranged around the periphery of the lower surface of the upper cover; the upper cover is sleeved on the upper extension section through the connecting hole, at the moment, the inner sealing ring is attached to the outer surface of the upper extension section, and the outer sealing ring is attached to the outer surface of the upper disc.

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