A relay with a splash-proof and breathable protective shell

Abstract

The present invention relates to the technical field of relays, and in particular discloses a relay with a splashproof breathable protective shell, comprising an insulator, a drive unit and a terminal unit arranged on the insulator, and a shell sleeved on the outside of the insulator, the drive unit and the terminal unit; an accommodating blind groove is concavely formed on the bottom surface of the shell, a first air hole is connected to the accommodating blind groove, a third air hole is used to connect the first air hole and the second air hole, the third air hole is arranged on an isolation part, and a fourth air hole is connected to the third air hole, and the fourth air hole is concavely formed from the outer side surface of the shell; in the actual use of the relay, the air in the accommodating blind groove is discharged to the outside of the shell through the first air hole, the third air hole, the second air hole, and the fourth air hole in sequence, so as to avoid bulging or bursting caused by excessive air pressure in the accommodating blind groove; when external water enters the fourth air hole, the isolation part blocks and resists the water, so as to avoid water entering the accommodating blind groove and polluting the relay, thereby extending the service life of the relay.

Description

Technical Field

[0001] The invention relates to the technical field of relays, and in particular discloses a relay with a splashproof and breathable protective shell. Background Art

[0002] Relay is one of the commonly used automatic switches in various circuits. During the actual use of the relay, due to the temperature change of the relay movement, the gas inside the relay expands due to heat and needs to be discharged. In the prior art, exhaust holes are provided on the relay, but the structural design of the exhaust holes in the prior art is unreasonable. External water can easily enter the inside of the relay through the exhaust holes, causing the relay to be damaged and unable to be used normally. Summary of the invention

[0003] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a relay with a splash-proof breathable protective shell, in which the air in the blind groove is discharged to the outside of the shell through the first air hole, the third air hole, the second air hole and the fourth air hole in sequence, so as to avoid bulging or bursting caused by excessive air pressure in the blind groove; when water from the outside enters the fourth air hole, the isolation part blocks the water, so as to avoid water entering the blind groove and contaminating the relay, thereby extending the service life of the relay.

[0004] To achieve the above-mentioned purpose, the present invention provides a relay with a splashproof breathable protective shell, comprising an insulator, a drive unit and a terminal unit arranged on the insulator, a shell sleeved on the outside of the insulator, the drive unit and the terminal unit, the shell having a blind accommodating groove for accommodating the insulator, the drive unit and the terminal unit, the drive unit being used to drive the terminal unit to be turned on or off; and also comprising a first air hole, a second air hole, a third air hole, a fourth air hole and an isolating portion arranged on the shell, the accommodating blind groove being concavely arranged on the bottom surface of the shell, the first air hole being connected to the accommodating blind groove, and the first air hole being connected to the blind accommodating groove. The air hole extends from the inner side surface of the accommodating blind groove toward the top surface of the shell, the isolation portion is used to isolate and separate the first air hole and the second air hole, the third air hole is used to connect the first air hole and the second air hole, the third air hole is arranged on the isolation portion, the fourth air hole is connected with the second air hole, and the fourth air hole is recessed from the outer side surface of the shell; the third air hole is located above the connection between the first air hole and the accommodating blind groove, and the third air hole is located above the connection between the fourth air hole and the second air hole, and the air in the accommodating blind groove is discharged to the outside of the shell through the first air hole, the third air hole, the second air hole, and the fourth air hole in sequence.

[0005] Among them, the driving unit includes an electromagnet arranged on the insulator, an armature movably arranged on the electromagnet and / or the insulator, and an insulating block arranged on the armature; the terminal unit includes a movable terminal and a static terminal arranged on the insulator, the electromagnet is used to drive the armature to move the insulating block, and the movable insulating block is used to drive the movable terminal to move so that the movable terminal contacts and conducts the static terminal or is separated and disconnected from the static terminal.

[0006] Among them, the static terminal includes a middle part, fixing feet and contact feet bent from both ends of the middle part respectively, and a static contact arranged on the middle part. The middle part is located between the fixing feet and the contact feet, and the fixing feet and the contact feet extend from the middle part in directions away from each other; the insulator has a first card slot, a second card slot and a third card slot for respectively accommodating the fixing feet, the middle part and the contact feet.

[0007] Among them, the insulator has a clamping protrusion located in the first card slot, a first semi-cylindrical rib located in the second card slot, a fourth card slot communicated with the third card slot, and a second semi-cylindrical rib located in the fourth card slot. The static terminal further includes a clamping piece bent from the contact foot. The middle part and the clamping piece clamp the insulator; the fixing foot has a bayonet for accommodating the clamping protrusion, and the smooth convex arc surface of the first semi-cylindrical rib is used to abut against one side of the middle part away from the contact foot; the fourth card slot is used to accommodate the clamping piece, and the smooth convex arc surface of the second semi-cylindrical rib is used to abut against one side of the clamping piece close to the middle part.

[0008] Among them, the insulator has a card hole and a limit hole. The electromagnet is detachably connected to the insulator and is located in the card hole. The electromagnet has a limit protrusion inserted into the limit hole; the armature is located in the card hole. The armature has two relief holes, and the electromagnet has two protruding feet respectively accommodated in the two relief holes. The armature is rotatably arranged between the electromagnet and the insulator.

[0009] Among them, it further includes a seal. The first air hole, the second air hole and the third air hole all penetrate through the top surface of the housing. The seal is arranged on the housing and is used to seal and cover the openings of the first air hole, the second air hole and the third air hole penetrating through the top surface of the housing.

[0010] Among them, it further includes a concave hole recessed from the top surface of the housing. The first air hole, the second air hole and the third air hole all penetrate through the bottom surface of the concave hole. The concave hole is used to accommodate the seal.

[0011] Among them, the inner side surface of the fourth air hole near the bottom side of the housing is an inclined plane, and the angle between the inclined plane and the bottom surface of the housing is an acute angle. After the external water enters the fourth air hole, it drains along the inclined plane under the action of gravity.

[0012] Among them, the housing has two rectangular outer frames protruding from the top surface of the housing. The housing has two through holes communicated with the accommodation blind groove and penetrating through the top wall of the housing. The through holes and the rectangular outer frames are in one-to-one correspondence, and the rectangular outer frames surround the through holes. The contact feet of the static terminal and the contact feet of the moving terminal respectively extend out of the housing through the two through holes. The two rectangular outer frames respectively surround the contact feet of the static terminal and the contact feet of the moving terminal. The rectangular outer frames are used to surround and limit the docking parts cooperating with the contact feet.

[0013] It also includes an isolation rib, and the two ends of the isolation rib are respectively arranged on the outer side surfaces of two adjacent rectangular outer frames. The beneficial effects of the present invention are as follows: during the actual use of the relay, the air in the blind groove is discharged to the outside of the housing through the first air hole, the third air hole, the second air hole, and the fourth air hole in sequence, so as to avoid excessive air pressure in the blind groove causing bulging or bursting; when water from the outside enters the fourth air hole, the isolation part blocks the water, so as to avoid water from entering the blind groove and contaminating the relay, thereby extending the service life of the relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0015] Figure 2 It is a schematic diagram of the decomposition structure of the present invention;

[0016] Figure 3 It is a schematic structural diagram of an insulator of the present invention;

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the housing of the present invention;

[0018] Figure 5 for Figure 4 A schematic diagram of the partially enlarged structure of part A;

[0019] Figure 6 is a cross-sectional view of a housing of the present invention;

[0020] Figure 7 for Figure 6 A partial enlarged structural diagram of part B in FIG. The reference numerals include:

[0021] 1—Insulator 2—Drive unit 3—Terminal unit

[0022] 4—shell 5—blind groove 6—first air hole

[0023] 7—Second air hole 8—Third air hole 9—Fourth air hole

[0024] 11 - isolation part 12 - electromagnet 13 - armature

[0025] 14—Insulation block 15—Moving terminal 16—Static terminal

[0026] 17 - middle part 18 - fixed foot 19 - contact foot

[0027] 21 - first card slot 22 - second card slot 23 - third card slot

[0028] 24—Card protrusion 25—First semi-cylindrical rib 26—Second semi-cylindrical rib

[0029] 27 - Card hole 28 - Limit hole 29 - Blind hole

[0030] 31 - Groove 32 - Seal 33 - Concave hole 34 - Inclined plane 35 - Rectangular outer frame 36 - Isolation rib. Specific implementation manner

[0031] For the convenience of understanding by those skilled in the art, the present invention will be further described below in conjunction with embodiments and the accompanying drawings. The content mentioned in the implementation manner does not limit the present invention.

[0032] Please refer to Figures 1 to 7 As shown, a relay with a waterproof and splash - proof breathable protective shell of the present invention includes an insulator 1, a driving unit 2 and a terminal unit 3 installed on the insulator 1, and a housing 4 sleeved outside the insulator 1, outside the driving unit 2 and outside the terminal unit 3. The housing 4 has a receiving blind groove 5 for accommodating the insulator 1, the driving unit 2 and the terminal unit 3. The main body shape of the housing 4 is a hollow cuboid. The housing 4 is integrally injection - molded from insulating plastic through an injection mold. The driving unit 2 is used to drive the terminal unit 3 to conduct or disconnect.

[0033] The relay further includes a first air hole 6, a second air hole 7, a third air hole 8, a fourth air hole 9 and an isolation part 11 provided on the housing 4. The receiving blind groove 5 is recessed on the bottom surface of the housing 4. The first air hole 6 communicates with the receiving blind groove 5. The first air hole 6 extends from the inner side surface of the receiving blind groove 5 towards the top surface of the housing 4. The isolation part 11 is used to isolate and separate the first air hole 6 and the second air hole 7, that is, the isolation part 11 is located between the first air hole 6 and the second air hole 7. The first air hole 6 and the second air hole 7 are spaced apart and arranged in parallel. The third air hole 8 is used to connect the first air hole 6 and the second air hole 7. The third air hole 8 is perpendicular to the first air hole 6. Of course, the third air hole 8 is also perpendicular to the second air hole 7. The third air hole 8 is provided on the isolation part 11 and penetrates through the isolation part 11 along the thickness direction of the isolation part 11.

[0034] The fourth air hole 9 communicates with the second air hole 7. The fourth air hole 9 is recessed from the outer side surface of the housing 4. The third air hole 8 is located above the connection of the first air hole 6 and the receiving blind groove 5. The third air hole 8 is located above the connection of the fourth air hole 9 and the second air hole 7. The air in the receiving blind groove 5 is discharged to the outside of the housing 4 in sequence through the first air hole 6, the third air hole 8, the second air hole 7 and the fourth air hole 9.

[0035] During the actual use of the relay, the air in the accommodating blind groove 5 is discharged to the outside of the housing 4 successively through the first air hole 6, the third air hole 8, the second air hole 7, and the fourth air hole 9, so as to prevent the air pressure in the accommodating blind groove 5 from being too high and causing bulging or bursting. When external water enters the fourth air hole 9, the water is blocked and resisted by the isolation part 11, preventing the water from entering the accommodating blind groove 5 to contaminate the relay and extending the service life of the relay.

[0036] The driving unit 2 includes an electromagnet 12 installed on the insulator 1, an armature 13 movably arranged on the electromagnet 12 or / and the insulator 1, and an insulating block 14 arranged on the armature 13. The insulating block 14 can be buckled on the armature 13. The terminal unit 3 includes a moving terminal 15 and a static terminal 16 fixedly arranged on the insulator 1. The electromagnet 12 is used to drive the armature 13 so that the insulating block 14 moves, and the moving insulating block 14 is used to drive the moving terminal 15 to move, so that the moving terminal 15 contacts and conducts with the static terminal 16 or separates from the static terminal 16.

[0037] After the electromagnet 12 is powered on, the coil of the electromagnet 12 will heat up, causing the temperature of the air in the accommodating blind groove 5 to rise. After the temperature rises, the air pressure in the accommodating blind groove 5 will increase. At this time, the air in the accommodating blind groove 5 is discharged to the outside of the housing 4 successively through the first air hole 6, the third air hole 8, the second air hole 7, and the fourth air hole 9, realizing the pressure relief and exhaust treatment of the air pressure in the accommodating blind groove 5.

[0038] The static terminal 16 includes a middle part 17, fixing feet 18 and contact feet 19 respectively bent from both ends of the middle part 17, and a static contact installed on the middle part 17. Preferably, the static terminal 16 is generally Z-shaped, the fixing feet 18 and the contact feet 19 are arranged in parallel, the middle part 17 is located between the fixing feet 18 and the contact feet 19, the middle part 17 is perpendicular to the fixing feet 18 and the contact feet 19, and the fixing feet 18 and the contact feet 19 extend away from each other from the middle part 17.

[0039] The insulator 1 has a first card slot 21, a second card slot 22 and a third card slot 23 for respectively accommodating the fixing feet 18, the middle part 17 and the contact feet 19. The three card slots are recessed from the outer surface on the same side of the insulator 1. The static terminal 16 is inserted and installed on the insulator 1, and the fixing feet 18, the contact feet 19 and the middle part 17 are blocked and limited by the inner side surface of the card slot, ensuring that the static terminal 16 is accurately installed on the insulator 1.

[0040] The insulator 1 has a clamping protrusion 24 located in the first card slot 21, a first semi-cylindrical rib 25 located in the second card slot 22, a fourth card slot communicating with the third card slot 23, and a second semi-cylindrical rib 26 located in the fourth card slot. The static terminal 16 further includes a clamping piece bent from the contact foot 19. The middle part 17 and the clamping piece clamp the insulator 1 by clamping the insulator 1 with both of them.

[0041] The fixed leg 18 has a bayonet for accommodating the clamping projection 24. With the cooperation of the bayonet and the clamping projection 24, the accurate installation and alignment of the fixed leg 18 are achieved. The smooth convex arc surface of the first semi-cylindrical rib 25 is used to abut against the side of the middle part 17 away from the contact leg 19. With the arrangement of the first semi-cylindrical rib 25, the frictional force between the middle part 17 and the insulator 1 is increased, preventing the middle part 17 from disengaging from the second card slot 22. The fourth card slot is used to accommodate the clamping piece, and the smooth convex arc surface of the second semi-cylindrical rib 26 is used to abut against the side of the clamping piece close to the middle part 17.

[0042] The insulator 1 has a card hole 27 and a limit hole 28. The electromagnet 12 is detachably connected to the insulator 1 and is located in the card hole 27. The insulator 1 protects the electromagnet 12. The electromagnet 12 has a limit projection inserted into the limit hole 28. With the cooperation of the limit hole 28 and the limit projection, the electromagnet 12 and the insulator 1 are quickly and accurately installed together.

[0043] The armature 13 is located in the card hole 27. The armature 13 has two relief holes, and the electromagnet 12 has two protruding feet respectively accommodated in the two relief holes. With the cooperation of the relief holes and the protruding feet, the armature 13 and the electromagnet 12 are prevented from disengaging from each other and malfunctioning, ensuring their accurate installation and cooperation. The armature 13 is rotatably arranged between the armature 13 and the insulator 1.

[0044] In this embodiment, the insulator 1 has a blind hole 29 and a groove 31 connecting the blind hole 29 and the card hole 27. The blind hole 29 is located above the card hole 27. The lower end of the groove 31 communicates with the card hole 27, and the upper end of the groove 31 penetrates the upper end of the side wall of the blind hole 29. The blind hole 29 is located below the first air hole 6. Through the arrangement of the blind hole 29, the blind hole 29 can accommodate the water entering the accommodation blind groove 5 through the air hole, further improving the waterproof performance of the relay. After the electromagnet 12 is energized and the temperature rises, the water in the blind hole 29 can also be heated, causing the water in the blind hole 29 to evaporate through the air hole.

[0045] It further includes a seal 32. The first air hole 6, the second air hole 7, and the third air hole 8 all penetrate the top surface of the housing 4. The seal 32 is installed on the housing 4, and the seal 32 is used to hermetically cover the openings of the first air hole 6, the second air hole 7, and the third air hole 8 penetrating the top surface of the housing 4.

[0046] Through the arrangement of the first air hole 6, the second air hole 7, and the third air hole 8 penetrating the top surface of the housing 4, during the actual manufacturing process of the housing 4, with the arrangement of the core-pulling insert, it is convenient for the injection mold to injection-mold the first air hole 6, the second air hole 7, and the third air hole 8, improving the manufacturing efficiency and manufacturing yield of the housing 4.

[0047] The openings on the top surface of the housing 4 through which the first air hole 6, the second air hole 7, and the third air hole 8 pass are sealed by the seal 32, preventing external water from entering the receiving blind groove 5 along the openings on the top surface of the housing 4 through the first air hole 6, the second air hole 7, and the third air hole 8 under the action of gravity, and improving the waterproof performance of the housing 4.

[0048] It further includes a concave hole 33 recessed from the top surface of the housing 4. The first air hole 6, the second air hole 7, and the third air hole 8 all penetrate through the bottom surface of the concave hole 33. The concave hole 33 is used to accommodate the seal 32. During actual manufacturing, the inner hole side surface of the concave hole 33 is used to block and limit the seal 32, ensuring that the seal 32 is quickly and accurately installed at the required position on the housing 4, and at the same time preventing the seal 32 from moving relative to the housing 4 and causing poor use.

[0049] The seal 32 is a circular flat plate. The seal 32 abuts against the inner side surface of the concave hole 33 with its outer side surface, and there is an interference fit between the seal 32 and the concave hole 33. The seal 32 is made by curing glue. During actual manufacturing, glue is added into the concave hole 33. After the glue is cured, the glue can form the seal 32 located in the concave hole 33. Of course, a heating device can be used to heat the glue in the concave hole 33 to quickly cure the glue to form the seal 32.

[0050] The inner side surface of the fourth air hole 9 near the bottom side of the housing 4 is an inclined plane 34. The included angle between the inclined plane 34 and the bottom surface of the housing 4 is an acute angle. After external water enters the fourth air hole 9, it is discharged along the inclined plane 34 under the action of gravity. By means of the setting of the inclined plane 34, the water entering the fourth air hole 9 can be automatically discharged, further improving the waterproof effect of the housing 4.

[0051] The housing 4 has two rectangular outer frames 35 protruding from the top surface of the housing 4. The housing 4 has two through holes that communicate with the receiving blind groove 5 and penetrate through the top wall of the housing 4. The through holes and the rectangular outer frames 35 are in one-to-one correspondence. The rectangular outer frames 35 are arranged around the through holes. The contact feet 19 of the static terminal 16 and the contact feet 19 of the moving terminal 15 respectively extend out of the housing 4 through the two through holes. The two rectangular outer frames 35 respectively surround the contact feet 19 of the static terminal 16 and the contact feet 19 of the moving terminal 15. The rectangular outer frames 35 are used to surround and limit the docking parts that cooperate with the contact feet 19.

[0052] By means of the setting of the rectangular outer frames 35, the protection of the contact feet 19 and the docking parts is realized, reducing the probability of both being damaged by external contact, and at the same time realizing the positioning and guiding of the docking parts. Of course, according to actual needs, the rectangular outer frames 35 can be formed by enclosing a plurality of non-continuous plate members.

[0053] It further includes a partition rib 36, and two ends of the partition rib 36 are respectively disposed on the outer side surfaces of two adjacent rectangular outer frames 35. By means of the arrangement of the partition rib 36, stable support for the two rectangular outer frames 35 is achieved. Meanwhile, the strength of the two rectangular outer frames 35 themselves is improved, and the probability that the two rectangular outer frames 35 are damaged due to being touched is avoided.

[0054] The housing 4 has a plurality of positioning feet, and the plurality of positioning feet are respectively disposed on an external circuit main board. Preferably, a plurality of positioning holes for respectively receiving the plurality of positioning feet are configured on the circuit main board; the bottom surface of the housing 4 is used for pressing against the circuit main board. The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A relay with a waterproof and splash-proof breathable protective shell, comprising an insulator, a driving unit and a terminal unit arranged on the insulator, a shell sleeved outside the insulator, the driving unit and the terminal unit, the shell having a receiving blind groove for receiving the insulator, the driving unit and the terminal unit, and the driving unit being used for driving the terminal unit to conduct or disconnect; characterized in that: It further includes a first air hole, a second air hole, a third air hole, a fourth air hole and a partition portion provided on the housing. The accommodating blind groove is recessed on the bottom surface of the housing. The first air hole communicates with the accommodating blind groove and extends from the inner side surface of the accommodating blind groove towards the top surface of the housing. The partition portion is used to isolate and separate the first air hole from the second air hole. The third air hole is used to communicate the first air hole with the second air hole and is provided on the partition portion. The fourth air hole communicates with the second air hole and is recessed from the outer side surface of the housing. The third air hole is located above the connection portion between the first air hole and the accommodating blind groove and above the connection portion between the fourth air hole and the second air hole. The air in the accommodating blind groove is discharged to the outside of the housing in sequence through the first air hole, the third air hole, the second air hole and the fourth air hole. The terminal unit includes a moving terminal and a static terminal provided on the insulator. The static terminal includes a middle portion, fixing feet and contact feet respectively bent from both ends of the middle portion, and a static contact provided on the middle portion. The middle portion is located between the fixing feet and the contact feet, and the fixing feet and the contact feet extend from the middle portion in directions away from each other. The housing has two rectangular outer frames protruding from the top surface of the housing. The housing has two through holes that communicate with the accommodating blind groove and penetrate the top wall of the housing. The through holes and the rectangular outer frames correspond one by one, and the rectangular outer frames surround the through holes. The contact feet of the static terminal and the contact feet of the moving terminal respectively extend out of the housing through the two through holes. The two rectangular outer frames respectively surround the contact feet of the static terminal and the contact feet of the moving terminal. The rectangular outer frames are used to surround and limit the docking parts that cooperate with the contact feet. It further includes a separation rib, and both ends of the separation rib are respectively provided on the outer side surfaces of two adjacent rectangular outer frames. It further includes a sealing member. The first air hole, the second air hole and the third air hole all penetrate the top surface of the housing. The sealing member is provided on the housing and is used to seal and cover the openings of the first air hole, the second air hole and the third air hole penetrating the top surface of the housing. It further includes a concave hole recessed from the top surface of the housing. The first air hole, the second air hole and the third air hole all penetrate the bottom surface of the concave hole. The concave hole is used to accommodate the sealing member. The sealing member abuts against the inner side surface of the concave hole in a blocking manner. There is an interference fit between the sealing member and the concave hole. The sealing member is made by curing glue. The glue is added into the concave hole, and after curing, a sealing member located in the concave hole is formed.

2. The relay with a waterproof and splash-proof breathable protective shell according to claim 1, characterized in that: The driving unit includes an electromagnet provided on the insulator, an armature movably provided on the electromagnet or / and the insulator, and an insulating block provided on the armature. The electromagnet is used to drive the armature so that the insulating block moves. The moving insulating block is used to drive the moving terminal to move, so that the moving terminal contacts and conducts with the static terminal or separates and disconnects from the static terminal.

3. The relay with a waterproof and splash-proof breathable protective case according to claim 2, characterized in that: The insulator has a first card slot, a second card slot and a third card slot for respectively accommodating the fixing feet, the middle portion and the contact feet.

4. The relay with a waterproof and splash-proof breathable protective case according to claim 3, wherein: The insulator has a clamping projection located in the first card slot, a first semi-cylindrical rib located in the second card slot, a fourth card slot communicating with the third card slot, and a second semi-cylindrical rib located in the fourth card slot. The static terminal further includes a clamping piece formed by bending a contact leg, and the middle part and the clamping piece clamp the insulator; the fixed leg has a bayonet for accommodating the clamping projection, and the smooth convex arc surface of the first semi-cylindrical rib is used to abut against one side of the middle part away from the contact leg; the fourth card slot is used to accommodate the clamping piece, and the smooth convex arc surface of the second semi-cylindrical rib is used to abut against one side of the clamping piece close to the middle part.

5. The relay with a waterproof and splash-proof breathable protective case according to claim 2, wherein: The insulator has a card hole and a limit hole. The electromagnet is detachably connected to the insulator and is located in the card hole. The electromagnet has a limit projection inserted into the limit hole; the armature is located in the card hole. The armature has two relief holes, and the electromagnet has two protrusions respectively accommodated in the two relief holes. The armature is rotatably arranged between the electromagnet and the insulator.

6. The relay with a waterproof and splash-proof breathable protective case according to claim 1, characterized in that: The inner side surface of the fourth air hole close to the bottom surface of the housing is an inclined plane, and the included angle between the inclined plane and the bottom surface of the housing is an acute angle. After the external water enters the fourth air hole, it is discharged along the inclined plane under the action of gravity.

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