Waterproof microswitch

Abstract

According to the technical scheme, the waterproof microswitch is characterized in that the waterproof microswitch comprises a housing; a transmission assembly is arranged in the shell and partially penetrates out of the shell, a sealing piece is arranged on the portion, penetrating out of the shell, of the transmission assembly, one end of the sealing piece wraps the outer side of the transmission assembly, and the other end of the sealing piece is embedded into the shell. The shell is also provided with a base; a switching assembly is arranged on the base; the transmission assembly is connected with the switching assembly in an abutting mode. The shell is provided with a sealant for sealing the joint of the shell and the base; according to the microswitch, the sealing element and the sealant are arranged, so that the external environment can be effectively isolated, water vapor is prevented from entering the microswitch from a gap, the waterproof, dustproof and moisture-proof performance of the microswitch is improved, and reliable work of the microswitch in a severe environment is ensured.

Description

Technical Field

[0001] This utility model relates to the field of micro switch technology, and more specifically, to a waterproof micro switch. Background Technology

[0002] A microswitch is a switch that uses external mechanical force to act on an actuating spring through a transmission element such as a button. When the actuating spring moves to a critical point, it produces a momentary action, causing the moving contact at the end of the actuating spring to quickly connect or disconnect with the fixed contact. However, because the button is retractably mounted on the microswitch housing and partially exposed, moisture can easily enter the microswitch through the gap between the button and the housing. This can easily cause corrosion to the internal components of the microswitch and affect the circuit conductivity.

[0003] Existing microswitches, such as the Chinese invention patent with patent publication number CN109545599A, disclose a compact microswitch. This microswitch includes a housing, a base, a transmission part, a support terminal, a normally open terminal, a normally closed terminal, a tension spring, a spring plate, a swing plate, and a push block. By adding a swing plate, the connection terminal only needs to be provided with a vertical numerical support plate, which reduces the width of the connection terminal and makes the base more compact.

[0004] However, the aforementioned microswitches still cannot solve the problem of poor sealing performance, so there is still room for improvement. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a waterproof micro switch to solve the above-mentioned technical problems.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a waterproof micro switch, comprising: a housing; a transmission component is provided inside the housing, a portion of the transmission component extends out of the housing, a sealing element is provided in the portion of the transmission component extending out of the housing, one end of the sealing element wraps around the outside of the transmission component, and the other end is embedded in the housing; a base is also provided on the housing; a switching component is provided on the base; the transmission component abuts against the switching component; and a sealant is provided on the housing to seal the connection between the housing and the base.

[0007] Specifically, the connection between the transmission component and the housing is sealed by a sealant, and the connection between the housing and the base is sealed by a sealant. This completely seals the housing and prevents moisture or dust from entering the housing from the connection between the housing and the transmission component, and between the housing and the base, ensuring that the switching components inside the housing can operate normally.

[0008] Optionally, the transmission assembly includes: a transmission column, a pressing head, and a pressing block; one end of the transmission column extends out of the housing, the pressing head is disposed at one end of the transmission column, an embedding groove is formed on the pressing head, and one end of the sealing element is disposed in the embedding groove; the pressing block is disposed at the other end of the transmission column; and the switching assembly abuts against the pressing block.

[0009] Specifically, one end of the seal is welded into the embedded groove and sleeved on the outside of the transmission column, improving the connection stability between the seal and the transmission column. When the pressing head is pressed, the pressing head pushes the transmission column into the housing, causing the extrusion block to squeeze the switching assembly, thus achieving circuit opening and closing switching.

[0010] Optionally, a limiting groove is formed on the extrusion block; the switching component abuts against the inner wall of the limiting groove.

[0011] Specifically, by creating a limiting groove on the extrusion block, the switching component abuts against the inner wall of the limiting groove. When the pressing head is pressed, the switching component slides within the limiting groove, thus restricting the position of the switching component and preventing it from sliding out of the limiting groove.

[0012] Optionally, the housing is provided with a guide groove; the extrusion block is slidably disposed within the guide groove.

[0013] Specifically, by setting guide grooves, the extrusion block can slide within the guide grooves, thereby improving the stability of the extrusion block during sliding.

[0014] Optionally, the switching assembly includes: a support member, a spring, and a movable spring piece; a common terminal, a normally open terminal, and a normally closed terminal are provided on the base; one end of the support member abuts against the base, and the other end abuts against the transmission assembly; one end of the spring is fixed to the support member, and the other end is fixed to the movable spring piece; one end of the movable spring piece abuts against the common terminal; when the transmission assembly is pressed, the movable spring piece abuts against the normally open terminal; when the transmission assembly is not pressed, the movable spring piece abuts against the normally closed terminal.

[0015] Specifically, when the transmission component is pressed, the support member deforms under the pressure of the transmission component, pulling the spring. The spring pulls the moving spring, causing it to deform and separate from the normally closed terminal. After the transmission component moves to the trigger position, the moving spring connects to the normally open terminal. The current input is connected through the common terminal, and the normally open and normally closed terminals are connected to the two current output terminals respectively, thus switching the circuit's on / off state when the transmission component is compressed.

[0016] Optionally, the support member includes: a locking part, a connecting part, and two support rods; one end of each of the two support rods is fixed to the locking part, and the other end is fixed to the connecting part; the locking part is locked onto the base; one end of the spring is fixed to the connecting part.

[0017] Specifically, when the transmission component is compressed, it pushes the connecting part. At this time, the two support rods deform and rotate around the connection between the engaging part and the base. The connecting part pulls the spring, thereby changing the position of the moving spring piece. By setting two support rods, the connection stability between the support, the base, the spring, and the transmission component can be ensured when the transmission component is pressed, eliminating the quality risk of the switch falling apart.

[0018] Optionally, the movable spring includes: a fastening part, a contact part, and two support rod parts; the fastening part is fixed to the other end of the spring; the contact part is disposed at one end of the fastening part; both support rod parts are disposed at the other end of the fastening part; both support rod parts abut against the common terminal; when the transmission assembly is pressed, the contact part abuts against the normally open terminal; when the transmission assembly is not pressed, the contact part abuts against the normally closed terminal.

[0019] Specifically, when the transmission assembly is compressed, the spring pulls the locking part to move. At this time, the two support rods deform, and the locking part drives the contact part to move, causing the contact part to separate from the normally closed terminal. After the transmission assembly moves to the trigger position, the contact part contacts the normally open terminal to conduct electricity. By setting two support rods, the connection stability between the moving spring and the common terminal can be ensured when the transmission assembly is pressed.

[0020] Optionally, a normally open contact that corresponds to and is adapted to the moving spring is provided on the normally open terminal.

[0021] Specifically, the moving spring contacts the normally open contact, thus connecting the fixed terminal and the normally open terminal. By setting a normally open contact on the normally open terminal, the contact sensitivity between the moving spring and the normally open terminal can be improved.

[0022] Optionally, a normally closed contact that corresponds to and is adapted to the moving spring is provided on the normally closed terminal.

[0023] Specifically, the moving spring contacts the normally closed contact, thus connecting the fixed terminal and the normally closed terminal. By setting a normally closed contact on the normally closed terminal, the contact sensitivity between the moving spring and the normally closed terminal can be improved.

[0024] Optionally, an annular groove is formed on the housing; the other end of the seal is welded into the annular groove.

[0025] Specifically, by setting an annular groove and welding the seal inside the groove, moisture or dust cannot enter the groove, thus improving the sealing effect at the connection between the transmission component and the housing.

[0026] In summary, this utility model has the following beneficial effects: by sealing the connection between the transmission component and the housing with a sealing element, and by sealing the connection between the housing and the base with sealant, the housing can be completely sealed, preventing moisture or dust from entering the housing from the connection between the housing and the transmission component, and between the housing and the base, thus ensuring that the switching component inside the housing can operate normally. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the waterproof micro switch according to an embodiment of the present invention;

[0028] Figure 2 This is an exploded view of the waterproof micro switch according to an embodiment of the present invention;

[0029] Figure 3 This is an exploded view of the switching component according to an embodiment of the present invention;

[0030] Figure 4 This is a cross-sectional view of the waterproof micro switch according to an embodiment of the present invention.

[0031] In the diagram: 1. Housing; 2. Transmission assembly; 21. Transmission column; 22. Press head; 23. Extrusion block; 3. Seal; 4. Base; 5. Switching assembly; 51. Support; 511. Engaging part; 512. Connecting part; 513. Support rod; 52. Spring; 53. Moving spring piece; 531. Fastening part; 532. Contact part; 533. Support rod part; 6. Sealant; 7. Embedded groove; 8. Limiting groove; 9. Common terminal; 10. Normally open terminal; 11. Normally closed terminal; 12. Normally open contact; 13. Normally closed contact; 14. Annular groove. Detailed Implementation

[0032] To make the objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0034] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] Example 1

[0036] This embodiment provides a waterproof micro switch, such as Figure 1-4 As shown, it includes: a housing 1; a transmission assembly 2 is provided inside the housing 1, a portion of the transmission assembly 2 protrudes from the housing 1, a sealing element 3 is provided at the portion of the transmission assembly 2 protruding from the housing 1, one end of the sealing element 3 wraps around the outside of the transmission assembly 2, and the other end is embedded in the housing 1; a base 4 is also provided on the housing 1; a switching assembly 5 is provided on the base 4; the transmission assembly 2 abuts against the switching assembly 5; and a sealant 6 is provided on the housing 1 to seal the connection between the housing 1 and the base 4.

[0037] Specifically, the connection between the transmission component 2 and the housing 1 is sealed by the sealant 3, and the connection between the housing 1 and the base 4 is sealed by the sealant 6. This completely seals the housing 1, preventing moisture or dust from entering the housing 1 from the connection between the housing 1 and the transmission component 2, and between the housing 1 and the base 4, thus ensuring that the switching component 5 inside the housing 1 can operate normally.

[0038] Optionally, the transmission assembly 2 includes: a transmission column 21, a pressing head 22, and a pressing block 23; one end of the transmission column 21 extends out of the housing 1, the pressing head 22 is disposed at one end of the transmission column 21, an embedding groove 7 is provided on the pressing head 22, and one end of the sealing member 3 is disposed in the embedding groove 7; the pressing block 23 is disposed at the other end of the transmission column 21; the switching assembly 5 abuts against the pressing block 23.

[0039] Specifically, one end of the seal 3 is welded into the embedded groove 7 and sleeved on the outside of the transmission column 21 to improve the connection stability between the seal 3 and the transmission column 21. When the pressing head 22 is pressed, the pressing head 22 pushes the transmission column 21 into the housing 1, causing the pressing block 23 to press the switching component 5, thereby realizing the circuit opening and closing switching.

[0040] The transmission column 21 is cylindrical, and the cross-section of the extrusion block 23 is U-shaped, so that the switching component 5 can move on the extrusion block 23.

[0041] Optionally, a limiting groove 8 is formed on the extrusion block 23; the switching component 5 abuts against the inner wall of the limiting groove 8.

[0042] Specifically, by opening a limiting groove 8 on the extrusion block 23, the switching component 5 abuts against the inner wall of the limiting groove 8. When the pressing head 22 is pressed, the switching component 5 slides in the limiting groove 8, and the position of the switching component 5 is restricted to prevent the switching component 5 from sliding out of the limiting groove 8.

[0043] Optionally, the housing 1 is provided with a guide groove; the extrusion block 23 is slidably disposed in the guide groove.

[0044] Specifically, by setting a guide groove, the extrusion block 23 slides within the guide groove, thereby improving the stability of the extrusion block 23 during sliding.

[0045] Optionally, the switching component 5 includes: a support member 51, a spring 52, and a movable spring piece 53; a common terminal 9, a normally open terminal 10, and a normally closed terminal 11 are provided on the base 4; one end of the support member 51 abuts against the base 4, and the other end abuts against the transmission component 2; one end of the spring 52 is fixed to the support member 51, and the other end is fixed to the movable spring piece 53; one end of the movable spring piece 53 abuts against the common terminal 9; when the transmission component 2 is pressed, the movable spring piece 53 abuts against the normally open terminal 10; when the transmission component 2 is not pressed, the movable spring piece 53 abuts against the normally closed terminal 11.

[0046] Specifically, when the transmission assembly 2 is pressed, the support member 51 deforms under the pressure of the pressing block 23, pulling the spring 52. The spring 52 pulls the movable spring piece 53, causing it to deform and separate from the normally closed terminal 11. After the transmission assembly 2 moves to the trigger position, the movable spring piece 53 becomes conductive with the normally open terminal 10. The current input terminal is connected through the common terminal 9, and the normally open terminal 10 and normally closed terminal 11 are respectively connected to the two current output terminals, thus switching the circuit's on / off state after the transmission assembly 2 is pressed.

[0047] The extrusion block 23 has a relief groove that matches the spring 52, so as to prevent the spring 52 from contacting the extrusion block 23 and causing the spring 52 to separate from the support member 51.

[0048] Optionally, the support member 51 includes: a locking part 511, a connecting part 512, and two support rods 513; one end of the two support rods 513 is fixed to the locking part 511, and the other end is fixed to the connecting part 512; the locking part 511 is locked onto the base 4; one end of the spring 52 is fixed to the connecting part 512.

[0049] Specifically, when the transmission component 2 is compressed, it pushes the connecting part 512. At this time, the two support rods 513 deform and rotate around the connection between the engaging part 511 and the base 4. The connecting part 512 pulls the spring 52, thereby changing the position of the moving spring piece 53. By setting two support rods 513, the connection stability between the support member 51 and the base 4, the spring 52, and the transmission component 2 can be ensured when the transmission component 2 is pressed, eliminating the quality risk of the switch falling apart.

[0050] Example 2

[0051] This embodiment provides a waterproof micro switch, such as Figure 1-4 As shown, it includes: a housing 1; a transmission assembly 2 is provided inside the housing 1, a portion of the transmission assembly 2 protrudes from the housing 1, a sealing element 3 is provided at the portion of the transmission assembly 2 protruding from the housing 1, one end of the sealing element 3 wraps around the outside of the transmission assembly 2, and the other end is embedded in the housing 1; a base 4 is also provided on the housing 1; a switching assembly 5 is provided on the base 4; the transmission assembly 2 abuts against the switching assembly 5; and a sealant 6 is provided on the housing 1 to seal the connection between the housing 1 and the base 4.

[0052] Specifically, the connection between the transmission component 2 and the housing 1 is sealed by the sealant 3, and the connection between the housing 1 and the base 4 is sealed by the sealant 6. This completely seals the housing 1, preventing moisture or dust from entering the housing 1 from the connection between the housing 1 and the transmission component 2, and between the housing 1 and the base 4, thus ensuring that the switching component 5 inside the housing 1 can operate normally.

[0053] Optionally, the transmission assembly 2 includes: a transmission column 21, a pressing head 22, and a pressing block 23; one end of the transmission column 21 extends out of the housing 1, the pressing head 22 is disposed at one end of the transmission column 21, an embedding groove 7 is provided on the pressing head 22, and one end of the sealing member 3 is disposed in the embedding groove 7; the pressing block 23 is disposed at the other end of the transmission column 21; the switching assembly 5 abuts against the pressing block 23.

[0054] Specifically, one end of the seal 3 is welded into the embedded groove 7 and sleeved on the outside of the transmission column 21 to improve the connection stability between the seal 3 and the transmission column 21. When the pressing head 22 is pressed, the pressing head 22 pushes the transmission column 21 into the housing 1, causing the pressing block 23 to press the switching component 5, thereby realizing the circuit opening and closing switching.

[0055] The transmission column 21 is cylindrical, and the cross-section of the extrusion block 23 is U-shaped, so that the switching component 5 can move on the extrusion block 23.

[0056] Optionally, a limiting groove 8 is formed on the extrusion block 23; the switching component 5 abuts against the inner wall of the limiting groove 8.

[0057] Specifically, by opening a limiting groove 8 on the extrusion block 23, the switching component 5 abuts against the inner wall of the limiting groove 8. When the pressing head 22 is pressed, the switching component 5 slides in the limiting groove 8, and the position of the switching component 5 is restricted to prevent the switching component 5 from sliding out of the limiting groove 8.

[0058] Optionally, the housing 1 is provided with a guide groove; the extrusion block 23 is slidably disposed in the guide groove.

[0059] Specifically, by setting a guide groove, the extrusion block 23 slides within the guide groove, thereby improving the stability of the extrusion block 23 during sliding.

[0060] Optionally, the switching component 5 includes: a support member 51, a spring 52, and a movable spring piece 53; a common terminal 9, a normally open terminal 10, and a normally closed terminal 11 are provided on the base 4; one end of the support member 51 abuts against the base 4, and the other end abuts against the transmission component 2; one end of the spring 52 is fixed to the support member 51, and the other end is fixed to the movable spring piece 53; one end of the movable spring piece 53 abuts against the common terminal 9; when the transmission component 2 is pressed, the movable spring piece 53 abuts against the normally open terminal 10; when the transmission component 2 is not pressed, the movable spring piece 53 abuts against the normally closed terminal 11.

[0061] Specifically, when the transmission assembly 2 is pressed, the support member 51 deforms under the pressure of the pressing block 23, pulling the spring 52. The spring 52 pulls the movable spring piece 53, causing it to deform and separate from the normally closed terminal 11. After the transmission assembly 2 moves to the trigger position, the movable spring piece 53 becomes conductive with the normally open terminal 10. The current input terminal is connected through the common terminal 9, and the normally open terminal 10 and normally closed terminal 11 are respectively connected to the two current output terminals, thus switching the circuit's on / off state after the transmission assembly 2 is pressed.

[0062] The extrusion block 23 has a relief groove that matches the spring 52, so as to prevent the spring 52 from contacting the extrusion block 23 and causing the spring 52 to separate from the support member 51.

[0063] Optionally, the support member 51 includes: a locking part 511, a connecting part 512, and two support rods 513; one end of each of the two support rods 513 is fixed to the locking part 511, and the other end is fixed to the connecting part 512; the locking part 511 is locked onto the base 4; one end of the spring 52 is fixed to the connecting part 512.

[0064] Specifically, when the transmission component 2 is compressed, it pushes the connecting part 512. At this time, the two support rods 513 deform and rotate around the connection between the engaging part 511 and the base 4. The connecting part 512 pulls the spring 52, thereby changing the position of the moving spring piece 53. By setting two support rods 513, the connection stability between the support member 51 and the base 4, the spring 52, and the transmission component 2 can be ensured when the transmission component 2 is pressed, eliminating the quality risk of the switch falling apart.

[0065] Optionally, the movable spring 53 includes: a fastening part 531, a contact part 532, and two support rod parts 533; the fastening part 531 is fixed to the other end of the spring 52; the contact part 532 is disposed at one end of the fastening part 531; the two support rod parts 533 are disposed at the other end of the fastening part 531; the two support rod parts 533 abut against the common terminal 9; when the transmission assembly 2 is pressed, the contact part 532 abuts against the normally open terminal 10; when the transmission assembly 2 is not pressed, the contact part 532 abuts against the normally closed terminal 11.

[0066] Specifically, when the transmission assembly 2 is compressed, the spring 52 pulls the locking part 531 to move. At this time, the two support rods 533 deform, and the locking part 531 drives the contact part 532 to move, causing the contact part 532 to separate from the normally closed terminal 11. After the transmission assembly 2 moves to the trigger position, the contact part 532 contacts the normally open terminal 10 to conduct electricity. By providing two support rods 533, the connection stability between the moving spring piece 53 and the common terminal 9 can be ensured when the transmission assembly 2 is pressed.

[0067] Optionally, a normally open contact 12 corresponding to and adapted to the moving spring 53 is provided on the normally open terminal 10.

[0068] Specifically, the movable spring 53 contacts the normally open contact 12, thus connecting the fixed terminal and the normally open terminal 10. By providing the normally open contact 12 on the normally open terminal 10, the contact sensitivity between the movable spring 53 and the normally open terminal 10 can be improved.

[0069] Optionally, a normally closed contact 13 that is adapted to the moving spring 53 is provided on the normally closed terminal 11.

[0070] Specifically, the movable spring 53 contacts the normally closed contact 13, thus connecting the fixed terminal and the normally closed terminal 11. By providing the normally closed contact 13 on the normally closed terminal 11, the contact sensitivity between the movable spring 53 and the normally closed terminal 11 can be improved.

[0071] Optionally, an annular groove 14 is provided on the housing 1; the other end of the seal 3 is welded into the annular groove 14.

[0072] Specifically, by setting an annular groove 14, the seal 3 is welded into the annular groove 14, preventing moisture or dust from entering the annular groove 14 and improving the sealing effect at the connection between the transmission component 2 and the housing 1.

[0073] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A waterproof micro switch, characterized in that, include: case; The housing contains a transmission assembly, a portion of which extends out of the housing. A seal is provided on the portion of the transmission assembly that extends out of the housing. One end of the seal wraps around the outside of the transmission assembly, and the other end is embedded in the housing. A base is also provided on the housing. A switching assembly is provided on the base. The transmission assembly abuts against the switching assembly. A sealant is provided on the housing to seal the connection between the housing and the base.

2. The waterproof micro switch according to claim 1, characterized in that, The transmission assembly includes: a transmission column, a pressing head, and a pressing block; one end of the transmission column extends out of the housing, the pressing head is disposed at one end of the transmission column, an embedding groove is formed on the pressing head, and one end of the sealing element is disposed in the embedding groove; the pressing block is disposed at the other end of the transmission column; the switching assembly abuts against the pressing block.

3. A waterproof micro switch according to claim 2, characterized in that, A limiting groove is formed on the extrusion block; the switching component abuts against the inner wall of the limiting groove.

4. A waterproof micro switch according to claim 2, characterized in that, The housing is provided with a guide groove; the extrusion block is slidably disposed in the guide groove.

5. A waterproof micro switch according to claim 1, characterized in that, The switching assembly includes: a support member, a spring, and a movable spring piece; a common terminal, a normally open terminal, and a normally closed terminal are provided on the base; one end of the support member abuts against the base, and the other end abuts against the transmission assembly; one end of the spring is fixed to the support member, and the other end is fixed to the movable spring piece; one end of the movable spring piece abuts against the common terminal; when the transmission assembly is pressed, the movable spring piece abuts against the normally open terminal; when the transmission assembly is not pressed, the movable spring piece abuts against the normally closed terminal.

6. A waterproof micro switch according to claim 5, characterized in that, The support component includes: a locking part, a connecting part, and two support rods; one end of each of the two support rods is fixed to the locking part, and the other end is fixed to the connecting part; the locking part is locked onto the base; one end of the spring is fixed to the connecting part.

7. A waterproof micro switch according to claim 5, characterized in that, The movable spring includes: a fastening part, a contact part, and two support rod parts; the fastening part is fixed to the other end of the spring; the contact part is disposed at one end of the fastening part; both support rod parts are disposed at the other end of the fastening part; both support rod parts abut against the common terminal; when the transmission assembly is pressed, the contact part abuts against the normally open terminal; when the transmission assembly is not pressed, the contact part abuts against the normally closed terminal.

8. A waterproof micro switch according to claim 5 or 7, characterized in that, The normally open terminal is provided with a normally open contact that corresponds to and is adapted to the moving spring.

9. A waterproof micro switch according to claim 5 or 7, characterized in that, The normally closed terminal is provided with a normally closed contact that corresponds to and is adapted to the moving spring.

10. A waterproof micro switch according to claim 1, characterized in that, An annular groove is formed on the housing; the other end of the seal is welded into the annular groove.

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