CN219645616U - Waterproof foam generating device - Google Patents

Abstract

The utility model provides a waterproof foam generating device, which comprises a shell, a foam pump and an air inlet pipeline, wherein the foam pump is provided with an air inlet; a first chamber isolated from the external air is formed in the shell, and the foam pump is arranged in the first chamber; the first chamber is provided with a first pipeline outlet, one end of the air inlet pipeline is fixedly connected with the air inlet, the other end of the air inlet pipeline extends out of the first chamber through the first pipeline outlet, and the first pipeline outlet is in sealing connection with the air inlet pipeline. The utility model has the advantages that: compared with the prior foam machine which adopts the mode of arranging the air holes on the shell, the foam machine can effectively prevent external water from entering the first cavity, and can avoid the damage of circuit devices in the first cavity caused by water inlet, thereby prolonging the service life of the foam generating device.

Description

Waterproof foam generating device

[ field of technology ]

The utility model relates to the technical field of foam machine products, in particular to a waterproof foam generating device.

[ background Art ]

Along with the improvement of life quality of people, higher requirements are put on liquid discharge modes of washing products such as liquid soap, liquid detergent, shampoo and the like, and foam machines are also appeared along with the liquid soap. Most of the existing foam machines pump liquid and gas to a gas-liquid mixing cavity through an electric foam pump to mix, so that foam is generated and sprayed out.

Currently, electric foam pumps are widely used, for example, in the chinese patent application No. 202220591476.7, which discloses an electric foam pump, wherein a cleaning liquid is pumped into a gas-liquid mixing chamber by an electric pump to be fully mixed with air, the liquid and the air are mixed in proportion to generate foam, and then the generated foam is divided into fine Mu Sizhuang foam to be sprayed out by a filter screen plug and a foam nozzle. Because the electric foam pump is required to suck air from the outside for mixing when in operation, the shell of the existing foam machine is provided with air holes so that the outside air can enter the shell through the air holes; however, due to the arrangement of the air holes, the waterproof performance of the foam machine is reduced, and water easily enters the shell through the air holes and causes damage to circuit devices; although the above patent discloses that the waterproof and breathable film is arranged at the air holes, the external water can not be prevented from entering the shell effectively, and particularly when the foam machine is immersed in water, the external water can not be prevented from entering the shell through the waterproof and breathable film.

In view of the problem that the existing foam machine is poor in waterproof performance, the foam generating device capable of effectively preventing external water from entering the shell is provided.

[ utility model ]

The utility model aims to solve the technical problem of providing a waterproof foam generating device, solves the problem of poor waterproof performance of the existing foam machine, and can effectively prevent external water from entering a machine shell, so that the service life of the foam generating device is prolonged.

The utility model is realized in the following way: the waterproof foam generating device comprises a shell, a foam pump and an air inlet pipeline, wherein the foam pump is provided with an air inlet; a first chamber isolated from the external air is formed in the shell, and the foam pump is arranged in the first chamber; the first chamber is provided with a first pipeline outlet, one end of the air inlet pipeline is fixedly connected with the air inlet, the other end of the air inlet pipeline extends out of the first chamber through the first pipeline outlet, and the first pipeline outlet is in sealing connection with the air inlet pipeline.

Further, the bottle body connecting seat is also included; a second cavity is formed below the first cavity in the shell, and the bottle body connecting seat is fixed in the second cavity; an air passage for communicating outside air is arranged between the bottle body connecting seat and the second chamber; the air inlet pipeline extends to the second chamber and is communicated with the air passage.

Further, a ventilation gap is reserved between the side wall of the bottle body connecting seat and the side wall of the second chamber; the lower end of the bottle body connecting seat surrounds the outer wall and is provided with an annular assembly part which is fixedly connected with the side wall of the second cavity; the annular assembly part is provided with an air inlet through hole.

Further, the bottom of body connecting seat is provided with body screwed joint, the air inlet channel that makes body screwed joint and gas circuit be linked together has been seted up at the top of body connecting seat, be provided with one-way admission valve in the air inlet channel.

Further, the top of the bottle body connecting seat is provided with a groove along the radial direction, and the groove is communicated with the air inlet channel.

Further, the top edge of the bottle body connecting seat is provided with a first convex ring, the middle part of the bottle body connecting seat is provided with a second convex ring around the air inlet channel, and the first convex ring and the second convex ring are propped against the top wall of the second cavity.

Further, the extending end of the air inlet pipeline is located between the first convex ring and the second convex ring, and a gap is reserved between the end of the air inlet pipeline and the top of the bottle body connecting seat.

Further, the device also comprises a shell and a spray head, wherein the spray head is arranged on the shell; the top of first cavity is provided with the installation opening, the casing is connected with the installation opening seal.

Further, the device also comprises a liquid inlet pipeline; the foam pump is provided with a liquid inlet, the first chamber is provided with a second pipeline outlet, and the bottle body connecting seat is provided with a third pipeline outlet; one end of the liquid inlet pipeline is fixedly connected with the liquid inlet, the other end of the liquid inlet pipeline penetrates through the second pipeline outlet and the third pipeline outlet, and the second pipeline outlet and the third pipeline outlet are in sealing connection with the liquid inlet pipeline.

Further, the device also comprises an inductive switch; the side wall of the shell is provided with a switch mounting port communicated with the first cavity, and the inductive switch is in sealing connection with the switch mounting port.

By adopting the technical scheme of the utility model, the utility model has at least the following beneficial effects:

1. through form in the casing with the isolated first cavity of outside air, set up the foam pump in first cavity, and utilize the admission line that stretches out to the outside of first cavity to be linked together outside air and the air inlet of foam pump, make during operation outside air can directly carry to the inside of foam pump through admission line, even have water to get into to admission line in this moment, finally also send into gas-liquid mixing intracavity together with liquid along with outside air, and can not get into first cavity, therefore compare with the mode that the bleeder vent was set up on the casing to current foam machine adoption, can effectively stop outside water and get into in the first cavity, can avoid the circuit device in the first cavity to damage because of intaking, thereby can promote foam generating device's life.

2. The air inlet channel which enables the threaded interface of the bottle body to be communicated with the air channel is arranged at the top of the bottle body connecting seat, and the one-way air inlet valve is arranged in the air inlet channel, so that the air inlet channel can be utilized to convey external air into the bottle body during operation, the air pressure in the bottle body is kept balanced, and the bottle body is ensured not to deform; the unidirectional air inlet valve can be used for blocking liquid in the bottle body, so that only external air can enter the bottle body, and the liquid in the bottle body cannot flow out of the air inlet channel.

3. The shell is in sealing connection with the mounting opening, the first pipeline outlet is in sealing connection with the air inlet pipeline, the liquid inlet pipeline is in sealing connection with the second pipeline outlet, the liquid inlet pipeline is in sealing connection with the third pipeline outlet, and the induction switch is in sealing connection with the switch mounting opening, so that the first cavity is completely isolated from external air.

[ description of the drawings ]

The utility model will be further described with reference to examples of embodiments with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view of the waterproof foam generating apparatus of the present utility model with the body removed;

fig. 2 is an overall cross-sectional view of the waterproof foam generating apparatus of the present utility model;

FIG. 3 is an exploded view of the waterproof foam generating apparatus of the present utility model;

FIG. 4 is an overall construction view of the waterproof foam generating apparatus of the present utility model;

FIG. 5 is a top view of the body connector of the present utility model;

FIG. 6 is a bottom view of the body connector of the present utility model;

FIG. 7 is one of the block diagrams of the enclosure of the present utility model;

FIG. 8 is a second block diagram of the housing of the present utility model.

Reference numerals illustrate:

a housing 1, a first chamber 11, a first pipe outlet 111, a mounting opening 112, a second pipe outlet 113, a second chamber 12, a switch mounting opening 13;

foam pump 2, air inlet 21, liquid inlet 22;

an air intake duct 3;

the bottle body connecting seat 4, the ventilation gap 41, the annular assembly part 42, the notch 421, the air inlet through hole 43, the bottle body threaded connector 44, the air inlet channel 45, the one-way air inlet valve 46, the groove 47, the first convex ring 48, the second convex ring 49 and the third pipeline outlet 40;

a bottle body 5;

a housing 6;

a spray head 7;

a liquid inlet pipe 8;

an inductive switch 91, a pipe joint 92;

sealing ring 10.

[ detailed description ] of the utility model

In order to better understand the technical scheme of the present utility model, the following detailed description will refer to the accompanying drawings and specific embodiments.

It should be noted herein that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. refer to an orientation or positional relationship based on that shown in the drawings, merely for convenience in describing these embodiments and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operate in a specific orientation. Furthermore, 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 implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature.

Example 1

Referring to fig. 1 to 8, a preferred embodiment of a waterproof foam generating device according to the present utility model includes a housing 1, a foam pump 2 and an air inlet pipe 3, wherein an air inlet 21 is provided on the foam pump 2, and the foam pump 2 can pump air into a gas-liquid mixing chamber to mix with liquid by using the air inlet 21, so as to generate a desired foam; a first chamber 11 isolated from the external air is formed in the casing 1, and the foam pump 2 is arranged in the first chamber 11; the first chamber 11 is provided with a first pipeline outlet 111, one end of the air inlet pipeline 3 is fixedly connected with the air inlet 21, the other end of the air inlet pipeline 3 extends out of the first chamber 11 through the first pipeline outlet 111, and the first pipeline outlet 111 is in sealing connection with the air inlet pipeline 3, so that external water cannot enter the first chamber 11 from the position between the first pipeline outlet 111 and the air inlet pipeline 3.

According to the utility model, the first chamber 11 isolated from the external air is formed in the shell 1, the foam pump 2 is arranged in the first chamber 11, and the external air is communicated with the air inlet 21 of the foam pump 2 by the air inlet pipeline 3 extending out of the first chamber 11, so that the external air can be directly conveyed into the foam pump 2 through the air inlet pipeline 3 during operation, at the moment, even if water enters the air inlet pipeline 3, the water is finally conveyed into the gas-liquid mixing chamber along with the external air to be mixed with the liquid, and the water cannot enter the first chamber 11, therefore, compared with the prior foam machine adopting a mode of arranging the air holes on the shell, the external water can be effectively prevented from entering the first chamber 11, the circuit devices in the first chamber 11 can be prevented from being damaged due to water inlet, and the service life of the foam generating device can be prolonged.

In the preferred embodiment of the present utility model, referring to fig. 1-2 and fig. 5-6, the foam generating device further comprises a bottle body connecting seat 4, wherein the bottle body connecting seat 4 is used for connecting with a bottle body 5 filled with a washing product or a skin care product, specifically, the bottle body connecting seat 4 is detachably connected with the bottle body 5, so that different bottle bodies 5 can be replaced or liquid products in the bottle body 5 can be replaced according to needs in a specific use process; a second chamber 12 is formed below the first chamber 11 in the shell 1, and the bottle connecting seat 4 is fixed in the second chamber 12, so that the bottle connecting seat 4 and the shell 1 are fixed together; an air passage for communicating outside air is arranged between the bottle body connecting seat 4 and the second chamber 12, namely, the bottle body connecting seat 4 can not only play a role in connecting with the bottle body 5, but also play a role in ventilation by being matched with the second chamber 12; the air inlet pipeline 3 extends to the second chamber 12 and is communicated with the air passage, and when the foam pump is in operation, outside air firstly enters the second chamber 12 through the air passage and then is conveyed into the foam pump 2 through the air inlet pipeline 3.

More specifically, a ventilation gap 41 is reserved between the side wall of the bottle body connecting seat 4 and the side wall of the second chamber 12, the ventilation gap 41 forms a part of the air path, and the air entering from the outside can pass through the ventilation gap 41; the lower end of the bottle body connecting seat 4 surrounds the outer wall and is provided with an annular assembling part 42, and the annular assembling part 42 is fixedly connected with the side wall of the second chamber 12, so that the bottle body connecting seat 4 cannot be separated from the second chamber 12; the annular fitting portion 42 is provided with an air inlet hole 43, and the air inlet hole 43 also forms a part of the air path, and the outside air enters through the air inlet hole 43 and then passes through the air vent gap 41. In order to allow the outside air to enter the second chamber 12 better, the annular fitting portion 42 is provided with a plurality of the air intake through holes 43 around the circumferential direction.

As a specific embodiment of the present utility model, a notch 421 is formed at an edge of the annular fitting portion 42, and the air inlet through hole 43 is formed between the notch 421 and the sidewall of the second chamber 12 after the annular fitting portion 42 is fixedly fitted to the sidewall of the second chamber 12. As another embodiment of the present utility model, an opening for forming the air inlet through hole 43 is formed in the middle of the annular fitting portion 42.

More specifically, the bottom of the bottle body connecting seat 4 is provided with a bottle body threaded interface 44, and the bottle body connecting seat 4 is in threaded connection with the upper end of the bottle body 5 through the bottle body threaded interface 44; an air inlet channel 45 for communicating the threaded interface 44 of the bottle body with the air path is formed at the top of the bottle body connecting seat 4, a one-way air inlet valve 46 is arranged in the air inlet channel 45, the one-way air inlet valve 46 is a common one-way valve in the prior art, the specific structure of the one-way air inlet valve 46 is well known to those skilled in the art, and the specific structure of the one-way air inlet valve 46 is not described in detail herein. Because the foam pump 2 needs to supplement air into the bottle body 5 at the same time in the process of sucking liquid from the bottle body 5 so as to maintain the air pressure balance in the bottle body 5, the bottle body 5 can not deform; therefore, the utility model adopts the air inlet channel 45 which enables the threaded interface 44 of the bottle body to be communicated with the air path on the top of the bottle body connecting seat 4, and the unidirectional air inlet valve 46 is arranged in the air inlet channel 45, so that the air inlet channel 45 can be utilized to realize the transportation of external air into the bottle body 5 during the work, the air pressure in the bottle body 5 is kept balanced, and the bottle body 5 is ensured not to deform; the unidirectional air inlet valve 46 can be utilized to block the liquid in the bottle body 5, so that only external air can enter the bottle body 5, and the liquid in the bottle body 5 cannot flow out from the air inlet channel 45.

More specifically, the top of the bottle body connecting seat 4 is provided with a groove 46 along the radial direction, and the groove 47 is communicated with the air inlet channel 45; the groove 46 also forms a part of the air path, and the external air enters the second chamber 12 through the air inlet through hole 43, enters the groove 46 through the air vent gap 41, and is finally conveyed into the bottle body 5 through the air inlet channel 45 and the one-way air inlet valve 46, so that the air inside the bottle body 5 is supplemented.

More specifically, the top edge of the body connecting seat 4 is provided with a first convex ring 48, the middle part of the body connecting seat 4 is provided with a second convex ring 49 around the air inlet channel 45, and the first convex ring 48 and the second convex ring 49 are propped against the top wall of the second chamber 12. By arranging the first convex ring 48 and the second convex ring 49 on the top of the bottle body connecting seat 4, the bottle body connecting seat 4 can be directly pushed into the second chamber 12 during installation, and the first convex ring 48 and the second convex ring 49 are propped against the top wall of the second chamber 12 without considering the gap between the top surface of the bottle body connecting seat 4 and the top wall of the second chamber 12, so that the installation is more convenient and quick; meanwhile, since the groove 46 is provided at the top of the body connecting seat 4 along the radial direction, external air can enter the top surface of the body connecting seat 4 through the groove 46.

More specifically, the extending end of the air inlet pipe 45 is located between the first convex ring 48 and the second convex ring 49, and a gap is left between the end of the air inlet pipe 45 and the top of the bottle body connecting seat 4. Because the first convex ring 48 and the second convex ring 49 are protruded upwards from the top surface of the bottle body connecting seat 4, even if the first convex ring 48 and the second convex ring 49 are propped against the top wall of the second chamber 12, a gap is still remained between the top surface of the bottle body connecting seat 4 and the top wall of the second chamber 12, and external air can enter the gap between the top surface of the bottle body connecting seat 4 and the top wall of the second chamber 12 through the groove 46; the projecting end of the air intake duct 45 is thus designed to lie between the first collar 48 and the second collar 49, ensuring that outside air can enter the air intake duct 45.

In the preferred embodiment of the present utility model, as shown in fig. 1-4, the foam generating apparatus further comprises a housing 6 and a spray head 7, wherein the spray head 7 is disposed on the housing 6, specifically, an output end of the foam pump 2 is connected with a bottom of the housing 6, the spray head 7 is disposed on a top of the housing 6, and an output end of the foam pump 2 is communicated with an interior of the spray head 7, so that the foam pump 2 can deliver the foam to the spray head 7 and realize spraying; the top of the first chamber 11 is provided with an installation opening 112, the shell 6 is in sealing connection with the installation opening 112, namely, the shell 6 is used as an upper cover of the shell 1, and the upper end of the shell 1 is sealed through the shell 6, so that external water cannot enter the first chamber 11 from between the shell 6 and the installation opening 112. In particular, a sealing glue may be used to achieve a sealing connection between the housing 6 and the mounting opening 112.

In the preferred embodiment of the present utility model, referring to fig. 1 to 3, the foam generating device further includes a liquid inlet pipe 8; the foam pump 2 is provided with a liquid inlet 22, the first chamber 11 is provided with a second pipeline outlet 113, and the bottle body connecting seat 4 is provided with a third pipeline outlet 40; one end of the liquid inlet pipeline 8 is fixedly connected with the liquid inlet 22, the other end of the liquid inlet pipeline 8 passes through the second pipeline outlet 113 and the third pipeline outlet 40, and the second pipeline outlet 113 and the third pipeline outlet 40 are in sealing connection with the liquid inlet pipeline 8. In practical implementation, the liquid inlet pipeline 8 needs to be inserted into the bottle body 5, so that the foam pump 2 can utilize the liquid inlet pipeline 8 to pump the liquid in the bottle body 5 into the gas-liquid mixing cavity to be mixed with the gas to obtain foam when in operation, and the second pipeline outlet 113, the third pipeline outlet 40 and the liquid inlet pipeline 8 are in sealing connection, so that external water cannot enter the first chamber 11 from the position between the liquid inlet pipeline 8 and the second pipeline outlet 113, and meanwhile, the liquid in the bottle body 5 cannot flow out from the position between the liquid inlet pipeline 8 and the third pipeline outlet 40.

Specifically, the sealing connection between the first pipe outlet 111 and the air inlet pipe 3, the sealing connection between the liquid inlet pipe 8 and the second pipe outlet 113, and the sealing connection between the liquid inlet pipe 8 and the third pipe outlet 40 may be achieved by providing the pipe joint 92 at the positions of the first pipe outlet 111, the second pipe outlet 113, and the third pipe outlet 40 in advance when the body connecting seat 4 and the casing 1 are manufactured, and casting the pipe joint 92 and the body connecting seat 4 or the casing 1 into a whole, and then connecting the air inlet pipe 3 or the liquid inlet pipe 8 and the pipe joint 92 when the installation is performed. Of course, the present utility model is not limited thereto, and other manners of sealing connection may be adopted in the specific implementation, for example, sealing glue is adopted between the first pipe outlet 111 and the air inlet pipe 3, between the liquid inlet pipe 8 and the second pipe outlet 113, and between the liquid inlet pipe 8 and the third pipe outlet 40.

In the preferred embodiment of the present utility model, referring to fig. 3-4, the foam generating device further comprises an inductive switch 91; the side wall of the casing 1 is provided with a switch mounting opening 13 communicated with the first chamber 11, and the inductive switch 91 is in sealing connection with the switch mounting opening 13, so that external water cannot enter the first chamber 11 from the position between the inductive switch 91 and the switch mounting opening 13. Specifically, the sealing ring 10 is sleeved on the inductive switch 91, and the sealing ring 10 is in pressing contact with the inner wall of the switch mounting opening 13, so that the sealing between the inductive switch 91 and the switch mounting opening 13 is realized.

In the present utility model, since the housing 6 is hermetically connected to the mounting opening 112, the first duct outlet 111 and the air intake duct 3, the liquid intake duct 8 and the second duct outlet 113, the liquid intake duct 8 and the third duct outlet 40, and the induction switch 91 and the switch mounting opening 13, the first chamber 11 is completely isolated from the outside air, and thus the foam generating apparatus of the present utility model is excellent in waterproofness, can withstand showers from various angles, and does not enter water even when the entire foam generating apparatus is immersed in water.

The working principle of the foam generating device of the utility model is as follows: when the hand of a user approaches the spray head 7, the inductive switch 91 controls the foam pump 2 to start working after sensing a hand signal, the foam pump 2 pumps liquid from the bottle body 5 to the gas-liquid mixing cavity through the liquid inlet pipeline 8, meanwhile, external air enters the second cavity 12 through the air path, the foam pump 2 pumps air from the second cavity 12 to the gas-liquid mixing cavity through the air inlet pipeline 3, so that the liquid and the air are mixed in the gas-liquid mixing cavity to generate foam, and the generated foam is output through the spray head 7; in addition, the air in the second chamber 12 can also enter the bottle body 5 through the air inlet channel 45 and the one-way air inlet valve 46 to balance the internal air pressure of the bottle body 5, so as to ensure that the bottle body 5 is not deformed due to air pressure difference when the foam pump 2 sucks liquid.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that the specific embodiments described are illustrative only and not intended to limit the scope of the utility model, and that equivalent modifications and variations of the utility model in light of the spirit of the utility model will be covered by the claims of the present utility model.

Claims (10)

1. The waterproof foam generating device comprises a shell and a foam pump, wherein an air inlet is formed in the foam pump; the method is characterized in that: the air inlet pipeline is also included; a first chamber isolated from the external air is formed in the shell, and the foam pump is arranged in the first chamber; the first chamber is provided with a first pipeline outlet, one end of the air inlet pipeline is fixedly connected with the air inlet, the other end of the air inlet pipeline extends out of the first chamber through the first pipeline outlet, and the first pipeline outlet is in sealing connection with the air inlet pipeline.

2. A waterproof foam generating apparatus according to claim 1, wherein: the bottle body connecting seat is also included; a second cavity is formed below the first cavity in the shell, and the bottle body connecting seat is fixed in the second cavity; an air passage for communicating outside air is arranged between the bottle body connecting seat and the second chamber; the air inlet pipeline extends to the second chamber and is communicated with the air passage.

3. A waterproof foam generating apparatus as defined in claim 2, wherein: a ventilation gap is reserved between the side wall of the bottle body connecting seat and the side wall of the second cavity; the lower end of the bottle body connecting seat surrounds the outer wall and is provided with an annular assembly part which is fixedly connected with the side wall of the second cavity; the annular assembly part is provided with an air inlet through hole.

4. A waterproof foam generating apparatus as defined in claim 2, wherein: the bottom of body connecting seat is provided with body screwed joint, the air inlet channel that makes body screwed joint and gas circuit be linked together has been seted up at the top of body connecting seat, be provided with one-way admission valve in the air inlet channel.

5. A waterproof foam generating apparatus according to claim 4, wherein: the top of body connecting seat is provided with the recess along radial direction, the recess is linked together with the air inlet channel.

6. A waterproof foam generating apparatus according to claim 4, wherein: the top edge of body connecting seat is provided with first bulge loop, the middle part of body connecting seat is provided with the second bulge loop around the inlet channel, first bulge loop and second bulge loop support in the roof of second cavity.

7. A waterproof foam generating apparatus according to claim 6, wherein: the extension end of the air inlet pipeline is positioned between the first convex ring and the second convex ring, and a gap is reserved between the end part of the air inlet pipeline and the top of the bottle body connecting seat.

8. A waterproof foam generating apparatus according to any one of claims 1 to 7, wherein: the shower nozzle is arranged on the shell; the top of first cavity is provided with the installation opening, the casing is connected with the installation opening seal.

9. A waterproof foam generating apparatus according to any one of claims 2 to 7, wherein: the device also comprises a liquid inlet pipeline; the foam pump is provided with a liquid inlet, the first chamber is provided with a second pipeline outlet, and the bottle body connecting seat is provided with a third pipeline outlet; one end of the liquid inlet pipeline is fixedly connected with the liquid inlet, the other end of the liquid inlet pipeline penetrates through the second pipeline outlet and the third pipeline outlet, and the second pipeline outlet and the third pipeline outlet are in sealing connection with the liquid inlet pipeline.

10. A waterproof foam generating apparatus according to any one of claims 1 to 7, wherein: the device also comprises an inductive switch; the side wall of the shell is provided with a switch mounting port communicated with the first cavity, and the inductive switch is in sealing connection with the switch mounting port.