CN214860133U

CN214860133U - Oral sprayer

Info

Publication number: CN214860133U
Application number: CN202120647245.9U
Authority: CN
Inventors: 张晓阳
Original assignee: Zhuhai Honggou Chain Trading Co ltd
Current assignee: Zhuhai Laiben Technology Co ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-11-26
Anticipated expiration: 2031-03-30

Abstract

The utility model relates to a cleaning device technical field specifically is oral cavity atomizer, include: the liquid spraying device comprises a shell, a liquid spraying device and a liquid spraying device, wherein an accommodating cavity is formed in the shell; the solution bomb is arranged in the shell, and a water absorption cotton core for absorbing the solution in the solution bomb is arranged in the solution bomb; a liquid outlet corresponding to the liquid spraying opening is formed in the solution ejection opening, and one end of the absorbent cotton core is located at the liquid outlet; the solution is provided with a pressure balance hole in an elastic manner, and a waterproof breathable film is arranged at the pressure balance hole; the atomizing sheet is arranged at one end of the absorbent cotton core, which is positioned at the liquid outlet; and the circuit board assembly is arranged in the accommodating cavity and is electrically connected with the atomizing sheet. Can prevent through waterproof ventilated membrane that the solution in the solution bullet from leaking, can guarantee the circulation of air between the solution bullet inside and outside simultaneously, the inside and outside air pressure of balanced solution bullet avoids the cotton core that absorbs water can't be with the solution suction, causes unable use.

Description

Oral sprayer

Technical Field

The utility model relates to a cleaning device technical field specifically is oral cavity atomizer.

Background

Along with the continuous improvement of living standard of people, people pay more attention to oral hygiene, and various oral sprayers capable of cleaning oral cavities appear on the market. Some existing oral sprayers use ultrasonic high-frequency vibration to atomize liquid into small water drops through an ultrasonic atomization principle, and then the small water drops are sprayed out. The existing oral sprayer has the advantages that the internal liquid storage bin is generally kept in a closed state, the liquid storage bin is provided with an opening capable of adding solution, and a sealing plug is arranged at the opening to seal the opening and avoid solution leakage. However, with the structure, under the condition of ensuring sealing, gas cannot circulate, and when the solution in the liquid storage bin is less and less, the internal pressure is less and less, so that the internal and external pressure difference is larger, the solution is difficult to extrude, and the normal use is influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an oral sprayer aims at solving the unable equilibrium of internal and external pressure in stock solution storehouse among the prior art, influences the solution and extrudes, uses inconvenient technical problem.

In order to achieve the above object, the utility model provides an oral sprayer, include:

the liquid spraying device comprises a shell, a liquid spraying device and a liquid spraying device, wherein an accommodating cavity is formed in the shell;

the solution bomb is arranged in the shell, and a water absorption cotton core for absorbing the solution in the solution bomb is arranged in the solution bomb; a liquid outlet corresponding to the liquid spraying opening is formed in the solution ejection opening, and one end of the absorbent cotton core is located at the liquid outlet; the solution is provided with a pressure balance hole in an elastic manner, and a waterproof breathable film is arranged at the pressure balance hole;

the atomizing sheet is arranged at one end of the absorbent cotton core, which is positioned at the liquid outlet;

and the circuit board assembly is arranged in the accommodating cavity and is electrically connected with the atomizing sheet. The solution in the solution bomb can be prevented from leaking through the waterproof breathable film, and meanwhile, the circulation of air between the inside and the outside of the solution bomb can be guaranteed, and the air pressure inside and outside the solution bomb is balanced.

Preferably, the waterproof breathable film comprises a polytetrafluoroethylene film and an acrylic pressure-sensitive adhesive layer which are sequentially laminated, and the acrylic pressure-sensitive adhesive layer is adhered to the pressure balance hole. The waterproof breathable film can be conveniently bonded at the liquid outlet of the solution bomb, and the operation is convenient.

Preferably, the thickness D of the waterproof breathable film is 0.25 mm-0.45 mm. Firm bonding, good air permeability and good waterproof effect.

Preferably, the water absorption cotton core comprises a vertical cotton core and a horizontal cotton core which are perpendicular to each other, one end of the horizontal cotton core is connected with the vertical cotton core, and the other end of the horizontal cotton core is located at the liquid outlet. The absorbent cotton core can absorb the solution in all directions, so that the spraying amount and the spraying effect are ensured.

Preferably, the solution bomb is internally provided with a clamping part, and the absorbent cotton core is clamped in the clamping part. The clamping part can conveniently fix the absorbent cotton core, and the absorbent cotton core is prevented from falling into the solution bomb.

Preferably, the clamping portion is provided with a through groove. The clamping part is prevented from completely wrapping the absorbent cotton core to influence the atomization effect.

Preferably, a silica gel sleeve is arranged at the liquid outlet. Effectively prevent the solution in the solution bomb from leaking from the liquid outlet.

Preferably, when the solution bomb is not installed in the casing, a silica gel plug is detachably installed at the liquid outlet. Avoid making dirty cotton core and the liquid outlet of absorbing water, can also avoid the cotton core of absorbing water to absorb other impurity simultaneously.

Preferably, the casing is provided with a slidable sliding cover at the liquid spray opening; the shell is provided with a sliding chute, and the side wall of the sliding chute is provided with a first clamping groove and a second clamping groove along the sliding direction of the sliding cover; an elastic clamping piece is arranged in the sliding groove in a sliding mode, a clamping portion matched with the first clamping groove or the second clamping groove is arranged on the elastic clamping piece, and the elastic clamping piece is connected with the sliding cover. The sliding cover is arranged to avoid dirtying the liquid spraying port, and the sliding cover is convenient to move.

Preferably, the casing is provided with a notch for the solution bomb to pass through when being assembled and disassembled, and the notch is detachably provided with a rear cover. The solution bomb is convenient to assemble, disassemble and replace.

The utility model discloses oral cavity atomizer has following beneficial effect at least: set up pressure balance hole in the solution bullet equally, be provided with waterproof ventilated membrane in pressure balance hole simultaneously, can prevent through waterproof ventilated membrane that the solution in the solution bullet from leaking, can guarantee the circulation of air between the inside and outside of solution bullet simultaneously, the inside and outside air pressure of balanced solution bullet avoids absorbing water the cotton core can't be with the solution suction, causes unable use.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is a schematic structural view of the sprayer of the present invention;

fig. 2 is a schematic diagram of the explosion structure of the sprayer of the invention;

FIG. 3 is a schematic cross-sectional view of the sprayer according to the present invention;

fig. 4 is a schematic structural view of the housing of the present invention;

fig. 5 is a side view of the housing of the present invention;

FIG. 6 is a schematic structural view of the solution bomb according to the present invention;

fig. 7 is a schematic sectional structure view of the solution bomb according to the present invention;

FIG. 8 is a schematic structural view of the absorbent cotton core of the present invention;

FIG. 9 is a schematic structural view of the waterproof and breathable film of the present invention;

fig. 10 is a schematic structural view of the elastic engaging member of the present invention.

In the drawings: 1-machine shell, 11-containing cavity, 12-liquid spraying port, 13-sliding chute, 14-first clamping groove, 15-second clamping groove, 16-notch, 17-charging port, 2-solution bomb, 21-liquid outlet, 22-pressure balance hole, 23-clamping part, 231-through groove, 3-absorbent cotton core, 31-vertical cotton core, 32-horizontal cotton core, 4-waterproof breathable film, 41-polytetrafluoroethylene film, 42-acrylic pressure sensitive adhesive layer, 5-atomizing sheet, 6-circuit board assembly, 7-silicone sleeve, 8-silicone plug, 9-sliding cover, 10-elastic clamping piece, 101-clamping part, 110-rear cover and 120-battery.

The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

As shown in fig. 1 to 10, the oral nebulizer comprises:

the liquid spraying device comprises a shell 1, a liquid spraying device and a liquid spraying device, wherein an accommodating cavity 11 is formed in the shell 1, and a liquid spraying port 12 is formed in the shell 1;

the solution bomb 2 is arranged in the shell 1, and a water absorption cotton core 3 for absorbing the solution in the solution bomb 2 is arranged in the solution bomb 2; the solution bomb 2 is provided with a liquid outlet 21 corresponding to the liquid spraying port 12, and one end of the absorbent cotton core 3 is positioned at the liquid outlet 21; the solution bomb 2 is provided with a pressure balance hole 22, and a waterproof breathable film 4 is arranged at the pressure balance hole 22;

the atomizing sheet 5 is arranged at one end of the absorbent cotton core 3 at the liquid outlet 21;

and the circuit board assembly 6 is arranged in the accommodating cavity 11, and the circuit board assembly 6 is electrically connected with the atomizing sheet 5.

The interior of the casing 1 is hollow to form a containing cavity 11, a liquid spraying port 12 is formed on the casing 1, and the liquid spraying port 12 is communicated with the containing cavity 11. A solution bomb 2 for storing solution is arranged in the machine shell 1 and is used for storing solution such as breath freshener and the like; the solution bomb 2 is provided with a liquid outlet 21 communicated with the inner space of the solution bomb, and the liquid outlet 21 corresponds to the liquid spraying port 12; a water-absorbing cotton core 3 is arranged in the solution bomb 2, one end of the water-absorbing cotton core 3 is positioned at the liquid outlet 21, and the water-absorbing cotton core 3 can absorb the solution in the solution bomb 2 to the liquid outlet 21; be equipped with atomizing piece 5 in the one end that cotton core 3 that absorbs water is located liquid outlet 21 department, atomizing piece 5 and the inside 6 electric connection of circuit board assembly of casing 1 can make 5 high frequency oscillations of atomizing piece through circuit board assembly 6 to the solution that cotton core 3 that will absorb water was got is broken up into a large amount of tiny drops, then outwards spouts through hydrojet mouth 12. The casing 1 is also provided with a battery 120, and the battery 120 is electrically connected with the circuit board assembly 6 and used for providing power for the circuit board assembly 6; the battery 120 can be set as a rechargeable battery 120, the charging port 17 is arranged on the casing 1, the charging port 17 is electrically connected with the battery 120, the battery 120 can be charged through the charging port 17, and the rechargeable battery is reusable and environment-friendly. The solution bomb 2 is also provided with a pressure balance hole 22, a waterproof breathable film 4 is arranged at the pressure balance hole 22, and the waterproof breathable film 4 can isolate the solution and can keep the air to pass through.

This technical scheme sets up pressure balance hole 22 in solution bullet 2 equally, is provided with waterproof ventilated membrane 4 in pressure balance hole 22 simultaneously, can prevent through waterproof ventilated membrane 4 that the solution in the solution bullet 2 from leaking, can guarantee the circulation of air between the inside and outside of solution bullet simultaneously, and the inside and outside air pressure of balanced solution bullet 2 avoids the cotton core 3 that absorbs water to be unable with the solution suction, causes unable use.

Further, the waterproof breathable film 4 comprises a polytetrafluoroethylene film 41 and an acrylic pressure-sensitive adhesive layer 42 which are sequentially laminated, wherein the acrylic pressure-sensitive adhesive layer 42 is adhered to the pressure balance hole 22.

The waterproof breathable film 4 is formed by laminating a polytetrafluoroethylene film 41 and an acrylic pressure-sensitive adhesive layer 42; the polytetrafluoroethylene membrane 41 is prepared by biaxial stretching through a special process, the surface of the polytetrafluoroethylene membrane 41 can reach billions of micropores per square inch, the diameter of each micropore is smaller than the minimum value of the minimum light fog in water molecules and is far larger than the diameter of a water vapor molecule, so that water vapor can pass through but water drops cannot pass through, and the micropore structure can achieve excellent waterproof and moisture permeable functions and simultaneously enable air to pass through; the acrylic pressure-sensitive adhesive layer 42 can form firm bonding force under small acting force, and can be firmly adhered to the solution bomb 2 to close the pressure balance hole 22 only by applying slight finger pressure; preferably, solvent-based pressure-sensitive adhesive is adopted, the water resistance is good, and the adhesive is not easy to lose effectiveness when being contacted with the solution in the solution bomb 2. The waterproof breathable film 4 is arranged like this, can conveniently bond in the liquid outlet 21 of the solution bomb 2, and is convenient to operate. The air permeability of the waterproof breathable film 4 can reach 730ml/min/cm2, the water pressure resistance is 1000mbar, the waterproof grade can reach IP67 (no leakage exists in water of 1.0 meter for 30 minutes), the working temperature range is-40-100 ℃, and the barrier rate to particles with the diameter of 0.1mm reaches more than 99.99%.

Further, the thickness D of the waterproof and breathable film 4 is 0.25 mm-0.45 mm.

In general, the solution bomb 2 is provided with a groove for accommodating the waterproof breathable film 4 at the pressure balance hole 22, and the shape of the groove is matched with that of the waterproof breathable film 4. The thickness D of the waterproof breathable film 4 cannot be too small, so that unstable bonding and poor waterproof effect are avoided; the thickness D of the waterproof breathable film 4 cannot be too large, so that the air permeability is prevented from being influenced, the groove is protruded, and the waterproof breathable film is easy to scrape. Therefore, the thickness D of the waterproof breathable film 4 is set to 0.25mm to 0.45mm, which can be avoided.

Further, the absorbent cotton core 3 comprises a vertical cotton core 31 and a horizontal cotton core 32 which are perpendicular to each other, one end of the horizontal cotton core 32 is connected with the vertical cotton core 31, and the other end is located at the liquid outlet 21. Vertical cotton core 31 and horizontal cotton core 32 mutually perpendicular, vertical cotton core 31 is located solution bullet 2 completely, and the one end and the vertical cotton core 31 of horizontal cotton core 32 are connected, and the other end is located liquid outlet 21 department and is connected with atomizing piece 5. The structure of the absorbent cotton core 3 can enable the absorbent cotton core to absorb solution in 360 degrees in all directions, and the atomizing sheet 5 can provide solution in time, so that the atomizer can spray water drops at all angles, and the atomizing amount and the atomizing effect are guaranteed.

Furthermore, a clamping part 23 is arranged inside the solution bomb 2, and the absorbent cotton core 3 is clamped in the clamping part 23.

The clamping part 23 is used for clamping and fixing the absorbent cotton core 3; the clamping part 23 is fixed on the inner wall of the solution bomb 2 and can be integrally formed with the solution bomb 2; and the clamping portion 23 is located at the liquid outlet 21. When the absorbent cotton core 3 is composed of the vertical cotton core 31 and the horizontal cotton core 32 which are perpendicular to each other, the clamping part 23 only clamps the horizontal cotton core 32. The clamping part 23 is arranged to conveniently fix the absorbent cotton core 3, so that one end of the absorbent cotton core 3 is always positioned at the liquid outlet 21, and the absorbent cotton core 3 is prevented from falling into the solution bomb 2.

Further, the clamping portion 23 is opened with a through groove 231. A through groove 231 is formed, so that the clamped absorbent cotton core 3 is partially exposed and can be directly contacted with the solution in the solution bomb 2, and the solution is absorbed and transported to the atomizing plate 5; the clamping part 23 is prevented from completely wrapping the absorbent cotton core 3, and the atomization effect is prevented from being influenced.

Further, a silica gel sleeve 7 is installed at the liquid outlet 21. The silica gel sleeve 7 is specifically arranged between the liquid outlet 21 and the liquid spraying port 12, the silica gel sleeve 7 is sleeved on the outward extending part of the liquid outlet 21, and the silica gel sleeve 7 can also fix the atomizing sheet 5. Set up silica gel cover 7, can improve the leakproofness of structure, can effectively prevent that the solution in the solution bullet 2 from leaking from liquid outlet 21.

Further, when the solution bomb 2 is not installed in the machine shell 1, a silica gel plug 8 is detachably installed at the liquid outlet 21. Set up silica gel stopper 8 and can play the seal effect to the solution bullet 2 of not installing, avoid making dirty cotton core 3 and the liquid outlet 21 that absorbs water, can also avoid absorbing water cotton core 3 to absorb other impurity simultaneously, pollute solution. When the solution bomb 2 is arranged in the shell 1, the silica gel plug 8 is taken down.

Further, the casing 1 is provided with a slidable sliding cover 9 at the liquid spray port 12; the casing 1 is provided with a sliding chute 13, and the side wall of the sliding chute 13 is provided with a first clamping groove 14 and a second clamping groove 15 along the sliding direction of the sliding cover 9; an elastic engaging member 10 is slidably disposed in the sliding groove 13, the elastic engaging member 10 is provided with an engaging portion 101 engaged with the first engaging groove 14 or the second engaging groove 15, and the elastic engaging member 10 is connected to the sliding cover 9.

The slide cover 9 can slide on the housing 1 to move closer to or away from the liquid discharge port 12, thereby opening or closing the liquid discharge port 12. The casing 1 has been seted up spout 13 in one side of hydrojet mouth 12, and first draw-in groove 14 and second draw-in groove 15 have been seted up to the lateral wall of spout 13, and the distance between first draw-in groove 14 and hydrojet mouth 12 is less than the distance between second draw-in groove 15 and hydrojet mouth 12, and first draw-in groove 14 is the same with the shape of second draw-in groove 15, all is used for the block portion 101 of chucking elasticity fastener 10. The elastic clamping piece 10 is arranged in the sliding groove 13, and the elastic clamping piece 10 has certain elastic deformation capacity, namely can be deformed under the extrusion of the side wall of the sliding groove 13 and can automatically recover the original state under the condition of no extrusion. The elastic engaging member 10 is connected to the sliding cover 9, and specifically, a groove is formed on the elastic engaging member 10, and the protruding portion on the sliding cover 9 is engaged in the groove. The process of opening the liquid jet 12 is: in an initial state, the elastic engaging member 10 is located in the sliding groove 13, and the engaging portion 101 is engaged with the first engaging groove 14, the user manually drives the sliding cover 9 to be away from the liquid spraying opening 12, the sliding cover 9 drives the elastic engaging member 10 to move from the first engaging groove 14 to the second engaging groove 15 in the sliding groove 13, the elastic engaging member 10 contracts and deforms inward under the extrusion of the side wall of the sliding groove 13, the engaging portion 101 leaves the first engaging groove 14, when the engaging portion 101 moves to the position of the second engaging groove 15, the elastic engaging member 10 returns to its original shape, so that the engaging portion 101 is engaged with the second engaging groove 15, and at this time, the sliding cover 9 is away from the liquid spraying opening 12, and the liquid spraying opening 12 is not blocked, so that the liquid spraying opening 12 is opened. It is easy to understand that the closing of the liquid spraying port 12 is the reverse movement of the sliding cover 9, which is not described herein. The sliding cover 9 is arranged to open or close the liquid spraying port 12 according to the use requirement, and the liquid spraying port 12 is kept closed when the sliding cover is not used, so that the liquid spraying port 12 is prevented from being polluted; the sliding groove 13 and the elastic clamping piece 10 are arranged, so that the sliding cover 9 can be moved conveniently; the first engaging groove 14, the second engaging groove 15 and the engaging portion 101 can ensure that the sliding cover 9 does not move freely when the liquid spraying port 12 is opened or closed, and the elastic engaging member 10 can be positioned, so that the position of the sliding cover 9 can be more accurate.

Further, the casing 1 is provided with a notch 16 through which the solution bomb 2 passes when being assembled and disassembled, and the notch 16 is detachably provided with a rear cover 110.

The shell 1 is provided with a gap 16, the size of the gap 16 can be penetrated by the solution bomb 2, namely the solution bomb 2 can be assembled and disassembled in the shell 1 through the gap 16; a rear cover 110 for opening or closing the gap 16 is detachably mounted on the case 1, the rear cover 110 is removed when the solution bomb 2 is mounted and removed, and the rear cover 110 is mounted after the solution bomb 2 is mounted; the solution bomb 2 is generally a disposable product, and the solution bomb 2 can be replaced after the solution is used. The rear cover 110 is arranged, so that the solution bomb 2 can be conveniently assembled and disassembled, the solution bomb 2 can be conveniently replaced after the solution is used up, and the solution bomb 2 filled with different solutions can be replaced according to requirements; the rear cap 110 also maintains the structural integrity of the sprayer.

The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An oral nebulizer, comprising:

the liquid spraying device comprises a shell (1), wherein an accommodating cavity (11) is formed in the shell (1), and a liquid spraying opening (12) is formed in the shell (1);

the solution bomb (2) is arranged in the shell (1), and a water absorption cotton core (3) for absorbing the solution in the solution bomb (2) is arranged in the solution bomb (2); the solution bomb (2) is provided with a liquid outlet (21) corresponding to the liquid spraying port (12), and one end of the absorbent cotton core (3) is positioned at the liquid outlet (21); the solution bomb (2) is provided with a pressure balance hole (22), and a waterproof breathable film (4) is arranged at the pressure balance hole (22);

the atomizing sheet (5) is arranged at one end of the water absorption cotton core (3) at the liquid outlet (21);

the circuit board assembly (6) is arranged in the accommodating cavity (11), and the circuit board assembly (6) is electrically connected with the atomizing sheet (5).

2. The oral nebulizer of claim 1, wherein the waterproof breathable film (4) comprises a polytetrafluoroethylene film (41) and an acrylic pressure-sensitive adhesive layer (42) laminated in this order, the acrylic pressure-sensitive adhesive layer (42) being stuck at the pressure equalizing hole (22).

3. The oral nebulizer of claim 1, wherein the waterproof and gas-permeable membrane (4) has a thickness D of 0.25mm to 0.45 mm.

4. An oral nebulizer as claimed in claim 1, wherein said absorbent wick (3) comprises a vertical wick (31) and a horizontal wick (32) perpendicular to each other, one end of said horizontal wick (32) being connected to said vertical wick (31) and the other end being located at said liquid outlet (21).

5. An oral nebulizer as claimed in claim 1, characterised in that the solution cartridge (2) is internally provided with a gripping portion (23), the absorbent cotton wick (3) being lodged in the gripping portion (23).

6. An oral nebulizer as claimed in claim 5, characterised in that the clamping part (23) is provided with a through slot (231).

7. The oral nebulizer of claim 1, wherein a silicone sleeve (7) is mounted at the liquid outlet (21).

8. An oral nebulizer as claimed in claim 1, characterised in that a silicone plug (8) is removably mounted at the liquid outlet (21) when the solution bomb (2) is not mounted in the housing (1).

9. An oral nebulizer as claimed in claim 1, characterised in that the housing (1) is provided with a slidable sliding cover (9) at the liquid ejection port (12); the shell (1) is provided with a sliding chute (13), and the side wall of the sliding chute (13) is provided with a first clamping groove (14) and a second clamping groove (15) along the sliding direction of the sliding cover (9); an elastic clamping piece (10) is slidably arranged in the sliding groove (13), a clamping part (101) matched with the first clamping groove (14) or the second clamping groove (15) is arranged on the elastic clamping piece (10), and the elastic clamping piece (10) is connected with the sliding cover (9).

10. The oral nebulizer of claim 1, wherein the housing (1) defines a notch (16) for the solution bomb (2) to pass through when the solution bomb is assembled and disassembled, and a rear cover (110) is detachably mounted at the notch (16).