Dust-proof sealing structure of push-type push handle switch

Abstract

The present invention relates to a dustproof sealing structure of a push-type push handle switch, comprising a shell, a mounting hole is provided on the shell, a push handle is inserted into the mounting hole, an annular groove is provided on the outer surface of the shell outside the mounting hole, a plurality of positioning holes are discretely arranged circumferentially on the bottom surface of the annular groove, a flexible dust cap is embedded in the annular groove, the bottom of the dust cap is a bottom ring matched with the annular groove, a cap body is integrally formed on the bottom ring, a through hole is provided on the top of the cap body, the through hole is sleeved on the push handle, and a positioning column corresponding to the plurality of positioning holes is integrally formed on the bottom surface of the bottom ring, the positioning column is correspondingly inserted into the positioning hole, and the lower end of any positioning column extends radially outward to form a positioning block, and each positioning block is inserted into the shell and abuts against the inner wall of the shell. The dustproof sealing structure of the present invention is not easy to age, not easy to wear, and does not need lubrication during use, and can effectively improve the dustproof sealing effect of the switch and extend the service life of the switch.

Description

Technical field:

[0001] The invention belongs to the technical field of dustproof sealing of switches, and in particular relates to a dustproof sealing structure of a push-type push handle switch. Background technology:

[0002] The push-type push-handle switch is a switch that realizes the contact and separation of the internal moving and static contacts by pressing the push handle. The push-type push-handle switch includes a housing, terminals located inside the housing, moving contacts and static contacts, and a push handle that is movably plugged into the housing. Since the switch has a circuit inside, it has high dustproof requirements. When dust enters the switch, it is easy to cause the switch to short-circuit and cause a safety accident. In order to prevent dust from entering, a sealing ring is usually set in the housing, and the push handle is passed through the sealing ring. In this way, the dust outside will be blocked outside the sealing ring and cannot enter the housing.

[0003] However, the reality is not so perfect. The frequent heating of the switch causes the premature aging of the seal ring, the deterioration of the sealing performance, and the entry of dust into the housing. In addition, the oil seepage of the seal ring or the lubricating oil applied to the inner side of the seal ring will be contaminated on the push handle. When the push handle moves outward, the lubricating oil contacts the dust in the air and firmly sticks the dust to the push handle. When the push handle moves into the housing, some dust will be brought into the seal ring, and some dust will accumulate on the push handle. Over time, the flexibility of the push handle will decrease, and it is more likely to lose the ability to automatically reset, which will directly lead to the failure of the switch. In addition, the long-term sliding of the push handle relative to the seal ring causes the seal ring to wear, the sealing performance to decrease, and finally causes dust to enter the housing. Summary of the invention:

[0004] The technical problem to be solved by the present invention is to provide a dustproof sealing structure for a push-type push handle switch, which is not easy to age, wear, or require lubrication during use, and can effectively improve the dustproof sealing effect of the switch.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dust-proof sealing structure of a push-type push handle switch, comprising a hollow box-type shell, a mounting hole is provided on the shell, the mounting hole is connected to the interior of the shell, a push handle is inserted in the mounting hole, one end of the push handle axially passes through the mounting hole and is inserted into the shell, and the other end of the push handle is exposed outside the shell, and the movement direction of the push handle is parallel to the axial direction of the mounting hole. An annular groove is provided on the outer side surface of the shell outside the mounting hole, and a plurality of positioning holes are discretely arranged circumferentially on the bottom surface of the annular groove, and the positioning hole is connected to the interior of the shell, and a flexible dust cap is embedded in the annular groove. The bottom of the dust cap is a bottom ring that cooperates with the annular groove, a cap body is integrally formed on the bottom ring, and a through hole is provided on the top of the cap body, and the through hole is sleeved on the push handle, and a positioning column corresponding to the plurality of positioning holes is integrally formed on the bottom surface of the bottom ring, and the positioning column is correspondingly inserted into the positioning hole one by one, and the lower end of any positioning column extends radially outward to form a positioning block, and each positioning block is inserted into the shell and abuts against the inner wall of the shell.

[0006] As a preferred solution, a cylindrical annular connecting sleeve is integrally formed at the upper end of the through hole, a circumferentially extending convex ring is integrally formed on the inner side wall of the connecting sleeve, a sealing groove cooperating with the convex ring is provided on the outer wall of the push handle, and the convex ring is tightly clamped in the sealing groove.

[0007] As a preferred solution, the positioning block protrudes inwardly from the inner wall of the shell, and a top block is fixedly connected to the push handle. The top block is located inside the shell and is opposite to the lower ends of all the positioning blocks. A pre-compressed spring is provided at the bottom of the push handle, and the elastic force of the spring drives the top block to press tightly against the bottom surfaces of all the positioning blocks.

[0008] As a preferred solution, a top block is fixedly connected to the push handle, which is located inside the shell and opposite to the lower ends of all the positioning blocks. A top rod corresponding to the positioning blocks is fixedly provided on the top block, and the top end of any top rod faces the bottom surface of the corresponding positioning block. A pre-compressed spring is provided at the bottom of the push handle, and the elastic force of the spring drives each top rod on the top block to press tightly against the bottom surface of the corresponding positioning block.

[0009] The beneficial effects of the present invention are as follows: the present invention utilizes a dust cap to seal the gap between the push handle and the mounting hole; when the push handle is pushed, the flexible dust cap adapts to the movement of the push handle by deformation; the through hole of the dust cap is tightly attached to the push handle and will not move relative to the push handle, thereby making the dustproof sealing effect between the push handle and the dust cap remain effective for a long time, thereby improving the dustproof effect of the switch.

[0010] The dustproof sealing structure of the present invention will not locally squeeze the dustproof cap when the push handle is pressed, thereby preventing the dustproof cap from being thinned or cracked due to local squeezing and compression, and further improving the dustproof effect.

[0011] The present invention further arranges a connecting sleeve at the upper end of the through hole to enhance the connection stability between the upper end of the dust cap and the push handle. At the same time, a convex ring is arranged on the inner wall of the connecting sleeve, and a sealing groove is arranged on the outer wall of the push handle, so that the convex ring is tightly clamped in the sealing groove to further enhance the sealing and stability of the connection between the top of the dust cap and the push handle, and further avoid relative sliding between the dust cap and the push handle.

[0012] The present invention further utilizes the top block or the top rod arranged on the top block to press against each positioning block under the action of a spring, and blocks the positioning hole from the inside of the shell to prevent dust from entering the shell from the positioning hole, thereby further improving the dustproof sealing effect. Description of the drawings:

[0013] The specific embodiments of the present invention are further described in detail below with reference to the accompanying drawings, wherein:

[0014] Figure 1 is a half-section view of the present invention;

[0015] Figure 2 It is a schematic diagram of the first structure of the upper cover of the shell;

[0016] Figure 3 is a schematic diagram of the second structure of the housing cover;

[0017] Figure 4 It is a schematic diagram of the half-section structure of the dust cap;

[0018] Figure 5 It is a schematic diagram of the first specific structure of the push handle;

[0019] Figure 6 It is a second specific structural schematic diagram of the push handle.

[0020] Figure 1 to Figure 6 In: 1. Shell, 101. Base, 102. Upper cover, 2. Mounting hole, 3. Push handle, 4. Annular groove, 5. Positioning hole, 6. Dust cap, 601. Bottom ring, 602. Cap body, 603. Through hole, 604. Positioning column, 605. Positioning block, 606. Connecting sleeve, 607. Protruding ring, 8. Top block, 9. Spring, 10. Groove. Specific implementation method:

[0021] The specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] like Figure 1As shown, the dustproof sealing structure of the push-type push handle switch includes a hollow box-type housing 1, which is formed by a base 101 and an upper cover 102 connected together. A mounting hole 2 is opened on the upper cover 102, and the mounting hole 2 is communicated with the interior of the housing 1. A push handle 3 is inserted into the mounting hole 2. One end of the push handle 3 axially passes through the mounting hole 2 and is inserted into the housing 1. The other end of the push handle 3 is exposed outside the housing 1. The movement direction of the push handle 3 is parallel to the axial direction of the mounting hole 2. Figure 2 As shown, an annular groove 4 is provided on the outer surface of the upper cover 102 of the housing 1 outside the mounting hole 2. In this embodiment, the annular groove 4 is preferably concentric with the mounting hole 2. Six positioning holes 5 are circumferentially arranged discretely on the bottom surface of the annular groove 4. The six positioning holes are preferably evenly distributed circumferentially. Each positioning hole 5 is connected to the interior of the housing 1. Figure 1 As shown, a flexible dome-shaped dust cap 6 is embedded in the annular groove 4. Figure 4 As shown, the bottom of the dust cap 6 is a bottom ring 601 that matches the annular groove 4, and a cap body 602 is integrally formed on the bottom ring 601. A through hole 603 is provided on the top of the cap body 602. Figure 1 and Figure 4 As shown, the through hole 603 is tightly sleeved on the push handle 3, and the bottom surface of the bottom ring 601 is integrally formed with positioning columns 604 corresponding to the six positioning holes 5. The positioning columns 604 are inserted into the positioning holes 5 one by one. The lower end of any positioning column 604 extends radially outward to form a positioning block 605. Each positioning block 605 is inserted into the shell 1 and abuts against the inner wall of the shell 1, specifically, abuts against the lower surface of the upper cover 102.

[0023] The number of the positioning holes 5 can be set as required, preferably 3 to 20.

[0024] The flexible dust cap 6 can be made of injection molding of materials such as rubber, plastic, silicone, and resin.

[0025] In order to improve the sealing effect between the positioning block 605 and the upper cover 102 of the shell 1, the present invention can also open a groove 10 on the lower end surface of the upper cover 102 that is tightly matched with each positioning block 605. In this way, the positioning block 605 can be embedded in the groove 10, so that the sealing effect between the dust cap and the upper cover 102 is better.

[0026] In this embodiment, the annular groove 4 can be coaxial with the mounting hole, or eccentric with the mounting hole. The annular groove 4 can be arranged outside the mounting hole 2 and separated from the mounting hole 2. Figure 2 As shown, it can also be arranged at the outer edge of the mounting hole 2 and connected with the mounting hole to form a Figure 3 Stepped hole shown.

[0027] Combination Figure 1 He Ru Figure 4As shown, a cylindrical annular connecting sleeve 606 is integrally formed at the upper end of the through hole 603, and a circumferentially extending convex ring 607 is integrally formed on the inner side wall of the connecting sleeve 606. A sealing groove 7 cooperating with the convex ring 607 is provided on the outer wall of the push handle 3, and the convex ring 607 is tightly clamped in the sealing groove 7.

[0028] Combination Figure 1 and Figure 5 As shown, the positioning block 605 protrudes inward from the inner wall of the shell 1, and a top block 8 is fixedly connected to the push handle 3. The top block 8 is located inside the shell 1, and the top block 8 is opposite to the lower ends of all the positioning blocks 605. A pre-compressed spring 9 is provided at the bottom of the push handle 3, one end of the spring 9 abuts against the push handle 3, and the other end abuts against the bottom surface of the base 101 of the shell 1. The elastic force of the spring 9 drives the top block 8 to press tightly against the bottom surfaces of all the positioning blocks 605.

[0029] like Figure 6 The push handle 3 of another structure is shown, and a top block 8 is also fixedly connected to the push handle 3. The top block 8 is located inside the housing 1, and the top block 8 is opposite to the lower ends of all the positioning blocks 605. However, the top block 8 is fixedly provided with a push rod 10 corresponding to the positioning blocks 605 one by one, and the top end of any push rod 10 is directly opposite to the bottom surface of the corresponding positioning block 605. The elastic force of the spring 9 drives each push rod 10 on the top block 8 to press against the bottom surface of the corresponding positioning block 605. The push rod 10 can be inserted into a relatively narrow space and press against the positioning block 605, so that the positioning block 605 does not protrude from the inner wall of the housing 1.

[0030] The working principle of the present invention is: Figure 1 As shown, the push handle 3 of the switch is only subjected to the upward elastic force of the spring 9, and the elastic force drives the push handle 3 to move upward, driving the top block 8 to press each positioning block 605 upward, so that each positioning block 605 is tightly attached to the bottom surface of the upper cover 102 of the shell 1, firmly blocking each positioning hole 5, so that external dust cannot enter the shell 1.

[0031] When the on / off state of the switch needs to be changed, the upper end of the push handle 3 is manually pressed downward, and the pressure overcomes the elastic force of the spring 9, so that the push handle 3 moves downward. The movement of the push handle 3 drives the convex ring 607 and the connecting sleeve 606 in the sealing groove 7 to move downward. The downward movement of the convex ring 607 and the connecting sleeve 606 forces the cap body 602 to deform. Since the cap body 602 is dome-shaped and made of flexible material, the cap body 602 is easy to produce elastic deformation without affecting its service life. When the cap body 602 is deformed, the bottom ring 601 is subjected to downward pressure, which improves the sealing performance between the bottom ring 601 and the bottom surface of the annular groove 4, thereby improving the sealing and dustproof effect.

[0032] When the push handle 3 moves downward, the top block 8 will also move downward, and the top block 8 will separate from the positioning block 605. Since the sealing between the bottom ring 601 and the bottom surface of the annular groove 4 is improved, the pressure reduction between the positioning block 605 and the bottom surface of the upper cover 102 will not lead to a decrease in the dustproof sealing effect of the switch.

[0033] When the pressure on the upper end of the push handle 3 disappears, the push handle 3 will return upward under the elastic force of the spring 9. At this time, the flexible positioning block 605 forms a buffering effect to prevent the top block 8 from directly impacting the housing 1 and causing damage to the housing 1, thereby indirectly extending the service life of the switch.

[0034] When the top block 8 is provided with a top rod 10 (such as Figure 6 As shown in FIG. 1 , the lower end surface of the positioning block 605 may not protrude from the lower end surface of the upper cover 102 , and the push rod 10 directly abuts against the lower end surface of the positioning block 605 .

[0035] The above embodiments are only illustrative of the principles and effects of the invention, as well as some embodiments of its application, and are not intended to limit the invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the invention, and all of these belong to the protection scope of the invention.

Claims

1. A dustproof sealing structure of a push-type push handle switch, comprising a hollow box-shaped housing (1), a mounting hole (2) being formed in the housing (1), the mounting hole (2) being communicated with the interior of the housing (1), a push handle (3) being inserted into the mounting hole (2), one end of the push handle (3) axially passing through the mounting hole (2) and inserted into the housing (1), the other end of the push handle (3) being exposed outside the housing (1), the movement direction of the push handle (3) being parallel to the axial direction of the mounting hole (2), and the characteristics of the present invention are as follows: An annular groove (4) is provided on the outer surface of the shell (1) outside the mounting hole (2); a plurality of positioning holes (5) are discretely arranged circumferentially on the bottom surface of the annular groove (4); the positioning holes (5) are connected to the interior of the shell (1); a flexible dust cap (6) is embedded in the annular groove (4); the bottom of the dust cap (6) is a bottom ring (601) that matches the annular groove (4); a cap body (602) is integrally formed on the bottom ring (601); and the top of the cap body (602) is provided with a cap body (602). A through hole (603) is provided on the shell (1), and the through hole (603) is sleeved on the push handle (3). The bottom surface of the bottom ring (601) is integrally formed with positioning posts (604) corresponding to the plurality of positioning holes (5). The positioning posts (604) are plugged into the positioning holes (5) in a one-to-one manner. The lower end of any positioning post (604) extends radially outward to form a positioning block (605). Each positioning block (605) is inserted into the shell (1), and the positioning block (605) abuts against the inner wall of the shell (1).

2. The dustproof sealing structure of the push-type push handle switch according to claim 1, characterized in that: A cylindrical annular connecting sleeve (606) is integrally formed at the upper end of the through hole (603), a circumferentially extending convex ring (607) is integrally formed on the inner side wall of the connecting sleeve (606), a sealing groove (7) cooperating with the convex ring (607) is provided on the outer wall of the push handle (3), and the convex ring (607) is tightly clamped in the sealing groove (7).

3. The dustproof sealing structure of the push-type push handle switch according to claim 1, characterized in that: The positioning block (605) protrudes inwardly from the inner wall of the shell (1); a top block (8) is fixedly connected to the push handle (3); the top block (8) is located inside the shell (1), and the top block (8) is opposite to the lower ends of all the positioning blocks (605); a pre-compressed spring (9) is provided at the bottom of the push handle (3); the elastic force of the spring (9) drives the top block (8) to press against the bottom surfaces of all the positioning blocks (605).

4. The dustproof sealing structure of the push-type push handle switch according to claim 1, characterized in that: A top block (8) is fixedly connected to the push handle (3). The top block (8) is located inside the housing (1) and is opposite to the lower ends of all the positioning blocks (605). Top rods (10) corresponding to the positioning blocks (605) are fixedly arranged on the top block (8). The top end of any top rod (10) faces the bottom surface of the corresponding positioning block (605). A pre-compressed spring (9) is arranged at the bottom of the push handle (3). The elastic force of the spring (9) drives each top rod (10) on the top block (8) to press against the bottom surface of the corresponding positioning block (605).

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