CN220824271U - Portable dental therapeutic instrument integrating treatment and teaching - Google Patents

Abstract

The utility model belongs to the technical field of dentistry, and relates to a portable dental therapeutic apparatus integrating treatment and teaching, which comprises a water tank, an instrument main body and a valve assembly, wherein a water pump is arranged in the instrument main body; the valve assembly comprises a water inlet upper cylinder and a top contact piece, wherein the water inlet upper cylinder is arranged in an opening at the bottom end of the water tank, a valve ball is arranged in the water inlet upper cylinder, the top contact piece is arranged at the top opening of the instrument main body and is communicated with the water pump through a pipeline, the top contact piece is provided with a boss, and when the water tank is matched and connected with the instrument main body, the boss is contacted with the valve ball in a propping way to open a water inlet channel so that water in the water tank enters the water pump; the dental therapeutic instrument has the beneficial effects that water can be injected into the water tank without an external water pipe, the restriction of the use environment is eliminated, the disassembly and assembly of the water tank are very convenient and quick, the dental therapeutic instrument is convenient to carry, and the technical problem that the existing dental therapeutic instrument is complex in structure and inconvenient to use in teaching is solved.

Description

Portable dental therapeutic instrument integrating treatment and teaching

Technical Field

The utility model relates to the technical field of dentistry, in particular to a portable dental therapeutic instrument integrating treatment and teaching.

Background

The existing dental treatment apparatus generally tends to be convenient in design for dental treatment, is difficult to use in teaching activities, and is not very friendly for a learner and a learner in terms of use.

The chinese patent No. CN201410169379.9 discloses a portable dental therapeutic apparatus, which comprises a box body, an air compressor, a water tank, a connector, a therapeutic tool, an electromagnetic pump, a panel control system with a display screen and adjusting the amount of air and water sprayed out from the therapeutic tool, and a pipeline system, wherein the box body comprises an upper box body and a lower box body, a flip cover which is positioned on one side of the upper box body and the lower box body and rotates and can be buckled on the side surface of the upper box body, the dental therapeutic apparatus further comprises a storage battery, a locking piece for controlling the upper box body and the lower box body to be combined and separated, a lifting mechanism arranged between the upper box body and the lower box body, a guide rail roller system capable of releasing or tightening a connecting sleeve along with the relative lifting of the lifting mechanism, and a wireless pedal controller for controlling the working force of the therapeutic tool, wherein the pipeline system is positioned in the connecting sleeve. The dental therapeutic instrument is portable, but has a complex structure, has certain requirements on the use environment, and is inconvenient for teaching.

Disclosure of utility model

First, the technical problem to be solved

In view of the above-mentioned shortcomings and disadvantages of the prior art, the present utility model provides a portable dental therapeutic apparatus integrating treatment and teaching, which solves the technical problems that the existing dental therapeutic apparatus has a complex structure and is inconvenient for teaching.

(II) technical scheme

In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:

The embodiment of the utility model provides a portable dental therapeutic apparatus integrating treatment and teaching, which comprises a water tank, an instrument main body and a valve assembly, wherein the instrument main body and the valve assembly are arranged below the water tank;

The valve assembly comprises a water inlet upper cylinder and a top contact piece, the water inlet upper cylinder is installed in an opening at the bottom end of the water tank, the water inlet upper cylinder is provided with a water inlet channel, a valve ball for blocking the water inlet channel is arranged in the water inlet upper cylinder, the top contact piece is installed at the top opening of the instrument main body and is communicated with the water pump through a pipeline, the top contact piece is provided with a boss and a water flow hole at the position opposite to the valve ball, the boss extends into the water inlet upper cylinder, and when the water tank is matched with the instrument main body, the boss is in contact with the valve ball to open the water inlet channel so that water in the water tank enters the water pump through the water flow hole.

Optionally, an elastic element is fixedly arranged in the upper end of the water inlet upper cylinder, an inner sealing ring is fixedly arranged on the inner wall of the lower end of the water inlet upper cylinder, and the valve ball abuts against the inner sealing ring under the action of the elastic element so that the water inlet channel is in a blocking state.

Optionally, the valve assembly further comprises a fitting head, the fitting head comprises a fitting part and a tubular part communicated with the fitting part, the fitting part is connected with the lower end of the top contact piece through threads, and the tubular part is communicated with the water pump through a pipeline.

Optionally, the valve assembly further comprises a sealing sleeve, the sealing sleeve is arranged at a position between the top contact piece and the water inlet upper cylinder, an O-shaped ring is fixedly arranged on the outer wall of the sealing sleeve, and the O-shaped ring is tightly matched with the inner wall of the top contact piece;

The outer wall of the water inlet upper cylinder is provided with a limiting step, the limiting step is abutted with the water tank, a first inner sealing ring is arranged between the limiting step and the water tank, and a first outer sealing ring is arranged between the water tank and the top contact piece;

The upper end of the top contact piece is provided with a mounting step, the mounting step is buckled on the top surface of the instrument main body, a second outer sealing ring is arranged between the mounting step and the top surface of the instrument main body, and a second inner sealing ring is arranged between the top wall of the instrument main body and the matched joint.

Optionally, the casing of instrument main part includes upper cover, inferior valve, plug-in type joint board and the control panel of mutually supporting, and the rear end of instrument main part is arranged in to plug-in type joint board, respectively with upper cover and inferior valve grafting cooperation, control panel is located the front end of instrument main part, respectively with upper cover and inferior valve buckle link together.

Optionally, the mobile phone pipeline joint, the mobile phone butt joint and the power supply joint are arranged on the plug-in joint plate in a penetrating mode side by side, the water receiving groove is arranged on the inner wall of the plug-in joint plate at the position opposite to the mobile phone pipeline joint, and the water outlet hole is formed in the corresponding position of the bottom of the water receiving groove.

Optionally, a main control board is mounted on the inner bottom wall of the instrument main body, the main control board is respectively electrically connected with a panel circuit board and a water pump, the control panel comprises a panel shell and a panel circuit board, the panel circuit board is electrically connected with a mobile phone butt joint, and the control panel is provided with a display window, a mode key and a gear key.

Optionally, the upper cover and the lower shell are provided with clamping grooves at the contact positions with the plug-in connector plates, and the plug-in connector plates are inserted into the clamping grooves.

Optionally, a mounting screw hole is provided at the bottom end of the lower case.

Optionally, the water tank comprises a tank body and a tank cover, wherein buckling pieces are arranged on two sides of the tank cover and buckled with the edge of the upper end of the tank body so as to connect the tank body and the tank cover together.

(III) beneficial effects

The beneficial effects of the utility model are as follows:

1. The portable dental therapeutic instrument integrating treatment and teaching is characterized in that the detachable water tank is arranged above the instrument main body, the water tank can be filled with water without an external water pipe, the restriction of the use environment is eliminated, the portable dental therapeutic instrument has no requirement on the use environment, the portable dental therapeutic instrument is more convenient to use, the water tank supplies water for the water pump of the instrument main body through the valve component, the portable dental therapeutic instrument is simple and compact in integral structure, the portable dental therapeutic instrument is very convenient and quick to assemble and disassemble, and convenient to carry, and can be used after being connected with the water pipe and the connecting wire of the dental handpiece, so that the dental therapeutic instrument can be applied to the scenes of teaching, treatment and the like, and the technical problems that the structure of the traditional dental therapeutic instrument is complex and the teaching is inconvenient to use are solved.

2. The independent water tank is arranged, so that water injection operation is convenient, water required by the dental handpiece can be provided, heat dissipation is carried out on the dental handpiece, the service life of the dental handpiece is greatly prolonged, and better medical experience is provided for patients; meanwhile, an adaptive valve assembly is further arranged, so that the water tank can be conveniently disassembled and assembled, and the problem that water leakage is not caused by repeated disassembly and assembly operations between the water tank and the instrument main body is solved.

3. The dental handpiece can change the use mode and the rotating speed through the control panel, can be used for dental treatment and teaching, and is more practical.

4. The water quantity adjusting knob is arranged, so that the water flow quantity of the dental handpiece water pipe can be adjusted, different treatment crowds can be adapted, and teaching requirements can be met.

5. The water receiving tank and the water outlet are arranged, so that the situation that the main control board and the circuit are damaged due to water leakage at the joint of the water pipe and the mobile phone pipeline joint is prevented.

Drawings

FIG. 1 is a schematic perspective view of a portable dental unit of the present utility model for therapeutic and teaching purposes;

FIG. 2 is one of the exploded schematic views of a portable dental treatment apparatus of the present utility model for therapeutic and teaching purposes;

FIG. 3 is a second exploded view of a portable dental unit of the present utility model for therapeutic and teaching purposes;

FIG. 4 is a schematic cross-sectional view of a portable dental unit of the present utility model for therapeutic and teaching purposes;

Fig. 5 is an enlarged schematic view at a in fig. 4.

[ Reference numerals description ]

1. A water tank; 11. a case cover; 12. a fastener; 13. a bearing bulge;

2. an instrument body;

211. An upper cover; 2112. a clamping groove; 212. a plug-in connector plate; 2121. a water outlet hole; 213. a lower case; 2131. installing screw holes; 214. a control panel; 2141. a panel case; 2142. a panel circuit board; 2143. displaying a window; 2144. a mode key; 2145. a gear key;

22. A valve assembly; 221. feeding water into a cylinder; 2211. an elastic member; 2212. a valve ball; 2213. a limit step; 2214. an inner seal ring; 222. a top contact; 2221. water flows through the holes; 223. a sealing sleeve; 2231. an O-ring; 224. a fitting; 225. a first inner seal ring; 226. a first outer seal ring; 227. a second inner seal ring; 228. a second outer seal ring;

23. A main control board;

24. a water pump;

25. A water quantity adjusting knob;

26. A water receiving tank;

27. a water pipe; 28. a mobile phone connecting wire; 29. a power line;

3. And a power switch.

Detailed Description

The utility model will be better explained by the following detailed description of the embodiments with reference to the drawings. Here, the terms "upper", "lower", "right", etc. are referred to with reference to the orientation of fig. 1, the direction in which the cover 11 is located is "upper", the direction in which the lower case 213 is located is "lower", the end in which the control panel 214 is located is "front", and the direction in which the plug-in connector board 212 is located is "rear".

The embodiment of the utility model provides a portable dental therapeutic apparatus integrating treatment and teaching, which comprises a water tank, an instrument main body and a valve assembly, wherein the instrument main body and the valve assembly are arranged below the water tank; the valve assembly comprises a water inlet upper cylinder and a top contact piece, the water inlet upper cylinder is arranged in an opening at the bottom end of the water tank, the water inlet upper cylinder is provided with a water inlet channel, a valve ball for blocking the water inlet channel is arranged in the water inlet upper cylinder, the top contact piece is arranged at the top opening of the instrument main body and is communicated with the water pump through a pipeline, a boss and a water flow hole are arranged at the position, opposite to the valve ball, of the top contact piece, the boss extends into the water inlet upper cylinder, and when the water tank is matched with the instrument main body, the boss is in contact with the valve ball to open the water inlet channel so that water in the water tank enters the water pump through the water flow hole; compared with the prior art, the water tank water injection can be realized without an external water pipe, the restriction of the use environment is eliminated, the use environment is free from the requirement, the water tank is more convenient to use, the water tank supplies water for the water pump of the instrument main body through the valve component, the whole structure is simple and small, the disassembly and assembly of the water tank are very convenient and quick, the water tank is convenient to carry, the water pipe and the connecting wire of the dental handpiece are connected for use, the dental therapeutic instrument can be applied to the scenes such as teaching and treatment, the technical problems that the structure of the existing dental therapeutic instrument is complex, and the teaching is inconvenient to use are solved.

In order that the above-described aspects may be better understood, exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

Examples:

Referring to fig. 1 and 2, embodiment 1 provides a portable dental therapeutic apparatus integrating therapy and teaching, which sequentially comprises a water tank 1, a valve assembly 22 and an apparatus main body 2 from top to bottom. A water pump 24 is arranged in the instrument main body 2, a mobile phone pipeline joint and a mobile phone butt joint are arranged at one end of the shell of the instrument main body 2, and the water pump 24, the mobile phone pipeline joint and the valve component 22 are communicated through pipelines.

As shown in fig. 4 and 5, the valve assembly 22 includes a water intake upper cylinder 221, a top contact 222, and a mating head 224. The water inlet upper cylinder 221 is installed in an opening at the bottom end of the water tank 1, and is provided with a water inlet passage. Elastic pieces 2211 with elasticity such as springs or elastic sheets are fixedly arranged at the upper end of the inner part of the water inlet upper cylinder 221, an inner sealing ring 2214 is fixedly arranged on the inner wall of the lower end of the water inlet upper cylinder, a valve ball 2212 is arranged between the elastic pieces, the lower end of the elastic pieces 2211 presses the valve ball 2212, and the valve ball 2212 abuts against the inner sealing ring 2214 under the action of the elastic pieces 2211 so that a water inlet channel is in a blocking state.

Referring to fig. 5, the top contact 222 is installed at the top opening of the instrument body 2, the bottom wall of the top contact 222 is provided with a boss and a water flow hole 2221, and when the water tank 1 is coupled with the instrument body 2, the boss top contacts the valve ball 2212 to open the water inlet passage so that water in the water tank 1 enters the water pump 24 through the water flow hole 2221.

Referring to fig. 5, the fitting 224 includes a fitting portion screwed with the lower end of the top contact 222 and a tubular portion penetrating therethrough, which communicates with the water pump 24 through a pipe.

Referring to fig. 2 and 4, in order to solve the problem that there may be water leakage in the coupling of the water tank 1 and the instrument, the valve assembly 22 is further provided with a sealing sleeve 223. Referring to fig. 5, the sealing sleeve 223 is disposed between the top contact 222 and the water inlet upper cylinder 221, an O-ring 2231 is fixedly disposed on the outer wall of the sealing sleeve 223, and the O-ring 2231 is tightly matched with the inner wall of the top contact 222.

Referring to fig. 5, as a possible solution, the outer wall of the water inlet upper tube 221 is provided with a limiting step 2213, the limiting step 2213 is abutted with the water tank 1, a first inner sealing ring 225 is disposed between the limiting step 2213 and the water tank 1, and a first outer sealing ring 226 is disposed between the water tank 1 and the top contact piece 222. The upper end of the top contact 222 is provided with a mounting step which is buckled on the top surface of the instrument main body 2, a second outer sealing ring 228 is arranged between the mounting step and the top surface of the instrument main body 2, and a second inner sealing ring 227 is arranged between the top wall of the instrument main body 2 and the matched joint 224.

As shown in fig. 2 and 3, the housing of the instrument body 2 includes an upper cover 211, a lower case 213, a plug-in connector plate 212, and a control panel 214, which are fitted to each other. The plug-in connector plate 212 is disposed at the rear end of the instrument main body 2 and is respectively in plug-in fit with the upper cover 211 and the lower shell 213, and the upper cover 211 and the lower shell 213 are respectively provided with a clamping groove 2112 at a contact position with the plug-in connector plate 212, and the plug-in connector plate 212 is inserted into the clamping groove 2112.

With continued reference to fig. 2 and 3, the cell phone pipe fitting, cell phone docking head, power fitting and power switch 3 are threaded side-by-side on the plug-in connector plate 212. In use, the water vapor pipe 27 of the dental handpiece is in butt-joint communication with the handpiece pipe joint, and the dental handpiece connecting wire 28 is in butt-joint electrical connection with the handpiece butt-joint. The power connector is connected with a power line 29 in a plugging manner. The water pipe 27 includes a water pipe and a gas pipe.

As shown in fig. 2, the control panel 214 is located at the front end of the instrument body 2, and is respectively snap-coupled to the upper cover 211 and the lower case 213. The control panel 214 includes a panel casing 2141 and a panel circuit board 2142, the panel circuit board 2142 is electrically connected to the mobile phone docking head, and the control panel 214 is provided with a display window 2143, a mode key 2144 and a gear key 2145. The main control board 23 is installed on the inner bottom wall of the instrument main body 2, and the main control board 23, the panel circuit board 2142 and the water pump 24 are electrically connected together.

As shown in fig. 2 and 5, in order to prevent the main control board 23 from being damaged due to water leakage at the junction of the water pipe 27 and the pipe joint of the cellular phone, the water receiving groove 26 is installed at the inner wall of the plug-in type joint plate 212 at the position opposite to the pipe joint of the cellular phone, and the water outlet 2121 is provided at the bottom of the water receiving groove 26 at the corresponding position of the plug-in type joint plate 212.

Referring to fig. 3, the bottom end of the lower case 213 is provided with a mounting screw hole 2131 for fixing the dental treatment apparatus to the operation table. One side of the lower shell 213 is provided with a water quantity adjusting knob 25 for changing the water flow of the pipeline and adjusting the water quantity of the water vapor pipe 27 entering the dental handpiece, so as to adapt to different treatment crowds and meet the teaching requirements.

Referring to fig. 3, the water tank 1 comprises a tank body and a tank cover 11, buckling pieces 12 are arranged on two sides of the tank cover 11, the buckling pieces 12 are buckled with the upper end edge of the tank body to connect the tank body and the tank cover 11 together, the tank cover 11 is convenient to open, water is injected into the tank body, and compared with the existing water tank 1 which needs to be injected through a water pipe, the water tank 1 does not need to be injected by the water pipe, has no requirement on the use environment, can be used in any environment, is convenient to use, and is more suitable for teaching activities. The bottom of box is provided with bearing bulge 13 all around, plays bearing and spacing effect.

In the description of the present utility model, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; may be a communication between two elements or an interaction between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature is "on" or "under" a second feature, which may be in direct contact with the first and second features, or in indirect contact with the first and second features via an intervening medium. Moreover, a first feature "above," "over" and "on" a second feature may be a first feature directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is level lower than the second feature.

In the description of the present specification, the terms "one embodiment," "some embodiments," "examples," "particular examples," or "some examples," etc., refer to particular features, structures, materials, or characteristics described in connection with the embodiment or example as being included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that alterations, modifications, substitutions and variations may be made in the above embodiments by those skilled in the art within the scope of the utility model.

Claims (10)

1. A portable dental therapeutic instrument integrating treatment and teaching, which is characterized in that: the device comprises a water tank (1), an instrument main body (2) and a valve assembly (22), wherein the instrument main body (2) is arranged below the water tank (1), a water pump (24) is arranged in the instrument main body (2), a mobile phone pipeline connector and a mobile phone butt joint are arranged at one end of a shell of the instrument main body (2), and the water pump (24) is communicated with the mobile phone pipeline connector through a pipeline;

The valve assembly (22) comprises a water inlet upper cylinder (221) and a top contact piece (222), the water inlet upper cylinder (221) is installed in an opening at the bottom end of the water tank (1), the water inlet upper cylinder (221) is provided with a water inlet channel, a valve ball (2212) is arranged in the water inlet upper cylinder (221), the top contact piece (222) is installed at the top opening of the instrument main body (2) and is communicated with the water pump (24) through a pipeline, a boss and a water flow hole (2221) are formed in the position, opposite to the valve ball (2212), of the top contact piece (222), and when the water tank (1) is matched with the instrument main body (2), the boss is in top contact with the valve ball (2212) to open the water inlet channel so that water in the water tank (1) enters the water pump (24).

2. A therapeutic and teaching integrated portable dental treatment apparatus as in claim 1, wherein: an elastic piece (2211) is fixedly arranged in the upper end of the water inlet upper cylinder (221), an inner sealing ring (2214) is fixedly arranged on the inner wall of the lower end of the water inlet upper cylinder, and the valve ball (2212) is abutted against the inner sealing ring (2214) under the action of the elastic piece (2211) so that the water inlet channel is in a blocking state.

3. A therapeutic and teaching integrated portable dental treatment apparatus as in claim 2, wherein: the valve assembly (22) further comprises a fitting (224), the fitting (224) comprises a fitting portion and a tubular portion communicated with the fitting portion, the fitting portion is in threaded connection with the lower end of the top contact piece (222), and the tubular portion is communicated with the water pump (24) through a pipeline.

4. A therapeutic, teaching-integrated portable dental treatment apparatus as in claim 3, wherein: the valve assembly (22) further comprises a sealing sleeve (223), the sealing sleeve (223) is arranged at a position between the top contact piece (222) and the water inlet upper cylinder (221), an O-shaped ring (2231) is fixedly arranged on the outer wall of the sealing sleeve (223), and the O-shaped ring (2231) is tightly matched with the inner wall of the top contact piece (222);

The outer wall of the water inlet upper cylinder (221) is provided with a limiting step (2213), the limiting step (2213) is abutted with the water tank (1), a first inner sealing ring (225) is arranged between the limiting step and the water tank, and a first outer sealing ring (226) is arranged between the water tank (1) and the top contact piece (222);

The upper end of the top contact piece (222) is provided with a mounting step, the mounting step is buckled on the top surface of the instrument main body (2), a second outer sealing ring (228) is arranged between the mounting step and the top surface of the instrument main body, and a second inner sealing ring (227) is arranged between the top wall of the instrument main body (2) and the matched connector (224).

5. A therapeutic and teaching integrated portable dental treatment apparatus as in claim 4, wherein: the shell of instrument main part (2) includes upper cover (211), inferior valve (213), plug-in connector board (212) and control panel (214) of mutually supporting, plug-in connector board (212) are arranged in the rear end of instrument main part (2), and respectively with upper cover (211) with inferior valve (213) grafting cooperation, control panel (214) are located instrument main part (2)'s front end respectively with upper cover (211) with inferior valve (213) buckle link together.

6. A therapeutic and teaching integrated portable dental treatment apparatus as in claim 5, wherein: the mobile phone pipeline connector, the mobile phone butt joint and the power supply connector are arranged on the plug-in connector plate (212) in a penetrating mode side by side, the water receiving groove (26) is arranged on the inner wall of the plug-in connector plate (212) at the position opposite to the mobile phone pipeline connector, and the water outlet hole (2121) is formed in the corresponding position of the bottom of the water receiving groove (26) in the plug-in connector plate (212).

7. A therapeutic and instructional integrated portable dental treatment apparatus according to claim 6 and wherein: main control board (23) is installed to interior bottom wall of instrument main part (2), control panel (214) are including panel shell (2141) and panel circuit board (2142), main control board (23) panel circuit board (2142) and water pump (24) electricity link together, panel circuit board (2142) with cell-phone butt joint head electricity is connected, control panel (214) are provided with display window (2143), mode button (2144) and gear button (2145).

8. A therapeutic and teaching integrated portable dental treatment apparatus as in claim 5, wherein: the upper cover (211) and the lower shell (213) are respectively provided with a clamping groove (2112) at the contact position with the plug-in type joint plate (212), and the plug-in type joint plate (212) is inserted into the clamping grooves (2112).

9. A therapeutic and teaching integrated portable dental treatment apparatus as in claim 5, wherein: one side of the lower shell (213) is provided with a water quantity adjusting knob (25).

10. A therapeutic and teaching integrated portable dental treatment apparatus as in claim 1, wherein: the water tank (1) comprises a tank body and a tank cover (11), buckling pieces (12) are arranged on two sides of the tank cover (11), and the buckling pieces (12) are buckled with the edge of the upper end of the tank body so as to connect and fix the tank body and the tank cover (11) together.