Novel magnetic proximity switch

Abstract

The utility model relates to a novel magnetic proximity switch which comprises a shell, a mounting cavity is arranged in the shell, a glass tube is arranged in the mounting cavity, the upper end of the glass tube is sleeved with a guide seat, the lower end of the glass tube is sleeved with a sealing seat, the mounting cavity is provided with a magnetic block on the upper side of the guide seat, and a first compression spring is arranged between the magnetic block and the top of the mounting cavity. The lower end of the push rod is connected with a mounting seat, a second compression spring is arranged between the upper side of the mounting seat and the guide seat, and the lower side of the mounting seat is fixedly connected with a metal contact piece. The sealing seat is fixedly connected with a main binding post, a first auxiliary binding post and a second auxiliary binding post which penetrate into the glass tube, the main binding post is provided with a contact piece abutting against the metal contact piece, and the first auxiliary binding post extends to the upper side of the metal contact piece and is fixedly connected with an upper contact. And the second auxiliary binding post is positioned on the lower side of the metal contact piece and is fixedly connected with a lower contact.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic switches, in particular to a novel magnetic proximity switch. Background Art

[0002] Magnetic proximity switches are widely used in various technical fields, and their working principle based on reed switches is currently a widely used form. As the core component of the magnetic switch, the reed switch has the advantages of not requiring an external power supply, fast response speed, simple structure, and long service life. However, since the working mechanism of the reed switch is to close the metal reed through a magnetic field, the switch is disconnected in the absence of an external magnetic field, which limits its use in certain application scenarios that require two-way control. In response to the above technical problems, the present application proposes a magnetic proximity switch that can have two closed loops when approaching and leaving an external magnetic field to meet the use of certain application scenarios that require two-way control. Utility Model Content

[0003] The utility model provides a novel magnetic proximity switch, which has two closed loops when the external magnetic field approaches and leaves, and solves the above problems existing in the use process of the prior art.

[0004] The technical solution of the utility model is achieved as follows: a new type of magnetic proximity switch, including a shell, a mounting cavity with an opening facing downwards is opened in the shell, a glass tube is arranged in the mounting cavity, a guide seat is sleeved on the upper end of the glass tube, a sealing seat is sleeved on the lower end of the glass tube, the guide seat and the sealing seat are both fixed on the shell, a magnetic block is movably arranged on the upper side of the guide seat in the mounting cavity, a first compression spring is arranged between the upper side of the magnetic block and the shell at the top of the mounting cavity, a push rod is fixedly connected to the lower end of the magnetic block and penetrates downwardly through the guide seat and enters the glass tube, a mounting seat is fixedly connected to the lower end of the push rod, a second compression spring is arranged between the upper side of the mounting seat and the guide seat, a metal contact is fixedly connected to the lower side of the mounting seat, a main terminal, a first auxiliary terminal and a second auxiliary terminal that penetrate from bottom to top into the glass tube are fixedly connected to the sealing seat, a contact piece that conflicts with the metal contact is arranged on the main terminal, the first auxiliary terminal extends to the upper side of the metal contact and is fixedly connected to an upper contact, and the second auxiliary terminal is located at the lower side of the metal contact and is fixedly connected to a lower contact.

[0005] Preferably, the contact piece includes a contact sleeve column, the lower end of which is fixedly connected to the main terminal, a sliding hole is provided on the metal contact piece, a sliding sleeve is provided on the sliding hole, and the contact sleeve column is movably fitted in the sliding sleeve and contacts with the inner wall of the sliding sleeve.

[0006] Preferably, a first protrusion and a second protrusion which are bent and arched toward the inner side wall of the sliding sleeve are provided on the side wall of the abutting sleeve.

[0007] Preferably, the abutment sleeve has an axially deformable groove on its side wall.

[0008] Preferably, the middle part of the metal contact is fixedly connected to the lower end of the mounting seat, the contact piece is located on the left side of the metal contact, the upper contact and the lower contact are located on the right side of the metal contact, and the right side of the metal contact is connected to a contact head located between the upper contact and the lower contact.

[0009] Preferably, a sealing guide sleeve is provided in the guide seat, and the push rod passes through the sealing guide sleeve and enters the glass tube.

[0010] Preferably, the magnetic block is wrapped with a buffer sleeve, the upper end surface of the magnetic block is exposed from the first buffer sleeve, and a buffer pad is fixedly connected to the shell at the top of the installation cavity.

[0011] In summary, the beneficial effects of the present invention are:

[0012] 1. When the external magnet that is attracted to the upper end of the magnetic block approaches the upper end of the shell, the magnetic block will compress the first compression spring upward to move it, and the magnetic block drives the mounting seat to compress the second compression spring upward through the push rod, so the metal contact also moves upward and then conflicts with the upper contact on the first auxiliary terminal. Since the metal contact conflicts with the contact piece on the main terminal, the main terminal and the first auxiliary terminal can be connected to form a closed loop. When the external magnet leaves, the first compression spring and the second compression spring reset, pushing the magnetic block, the push rod, the mounting seat and the metal contact on the mounting seat to move downward, so that the metal contact conflicts with the lower contact on the second auxiliary terminal, and the main terminal and the second auxiliary terminal are connected to form a closed loop. In summary, the utility model has two closed loops when the external magnetic field approaches and leaves, which meets the use in certain application scenarios that require two-way control. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the utility model after removing the shell;

[0017] Figure 4 This is a schematic diagram of the structure of the utility model after removing the shell and glass tube structures;

[0018] Figure 5 It is a structural schematic diagram of the sealing seat, the main terminal, the first auxiliary terminal and the second auxiliary terminal in the utility model;

[0019] Figure 6 It is a structural schematic diagram of the magnetic block, push rod, mounting seat and metal contact piece in the utility model;

[0020] Figure 7 It is a structural schematic diagram of the guide seat in the utility model.

[0021] In the figure: 1. shell; 2. mounting cavity; 3. glass tube; 4. guide seat; 5. sealing seat; 6. magnetic block; 7. first compression spring; 8. push rod; 9. mounting seat; 10. second compression spring; 11. metal contact; 12. sliding hole; 13. sliding sleeve; 14. contact head; 15. main terminal; 16. first auxiliary terminal; 17. second auxiliary terminal; 18. contact piece; 19. upper contact; 20. lower contact; 21. contact sleeve column; 22. first protrusion; 23. second protrusion; 24. deformable groove; 25. sealing guide sleeve; 26. buffer sleeve; 27. buffer pad; 28. wire. DETAILED DESCRIPTION

[0022] The following will be combined with the attached embodiment of the present utility model Figure 1-7 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example:

[0024] like Figures 1 to 7As shown, the utility model discloses a novel magnetic proximity switch, comprising a shell 1, a mounting cavity 2 with an opening facing downward is opened in the shell 1, a glass tube 3 is arranged in the mounting cavity 2, a guide seat 4 is sleeved on the upper end of the glass tube 3, and a sealing seat 5 is sleeved on the lower end of the glass tube 3, wherein the guide seat 4 and the sealing seat 5 are both fixed on the shell 1, and in addition, a magnetic block 6 is movably arranged on the upper side of the guide seat 4 in the mounting cavity 2, a first compression spring 7 is arranged between the upper side of the magnetic block 6 and the shell 1 at the top of the mounting cavity 2, and a push rod 8 is fixedly connected to the lower end of the magnetic block 6, which penetrates downwardly through the guide seat 4 and enters into the glass tube 3, and a mounting seat 9 is fixedly connected to the lower end of the push rod 8, and a second compression spring 10 is arranged between the upper side of the mounting seat 9 and the guide seat 4, The first compression spring 7 and the second compression spring 10 are used to push the magnetic block 6, the push rod 8 and the mounting seat 9 downward. Then, a metal contact 11 is fixedly connected to the lower side of the mounting seat 9. In addition, a main terminal 15, a first auxiliary terminal 16 and a second auxiliary terminal 17 are fixedly connected to the sealing seat 5 and penetrate into the glass tube 3 from bottom to top. The main terminal 15 is provided with a contact piece 18 that contacts the metal contact 11. The first auxiliary terminal 16 extends to the upper side of the metal contact 11 and is fixedly connected to an upper contact 19. The second auxiliary terminal 17 is located on the lower side of the metal contact 11 and is fixedly connected to a lower contact 20. The main terminal 15, the first auxiliary terminal 16 and the second auxiliary terminal 17 are all connected to a wire 28 at one end located under the sealing seat 5.

[0025] The working principle of the utility model is as follows: when the external magnet that is attracted to the upper end of the magnetic block 6 approaches the upper end of the shell 1, the magnetic block 6 will compress the first compression spring 7 upward to move, and the magnetic block 6 drives the mounting seat 9 to compress the second compression spring 10 upward through the push rod 8, so the metal contact 11 also moves upward and then conflicts with the upper contact 19 on the first auxiliary terminal 16. Since the metal contact 11 conflicts with the contact piece 18 on the main terminal 15, the main terminal 15 and the first auxiliary terminal 16 can be connected to form a closed loop. When the external magnet leaves, the first compression spring 7 and the second compression spring 10 reset, pushing the magnetic block 6, the push rod 8, the mounting seat 9 and the metal contact 11 on the mounting seat 9 to move downward, so that the metal contact 11 conflicts with the lower contact 20 on the second auxiliary terminal 17, and the main terminal 15 and the second auxiliary terminal 17 are connected to form a closed loop. In summary, the utility model has two closed loops when the external magnetic field approaches and leaves, which meets the use in certain application scenarios that require two-way control.

[0026] Specifically, the contact piece 18 includes a contact sleeve column 21, the lower end of which is fixedly connected to the main terminal 15, and the metal contact piece 11 is provided with a sliding hole 12, and a sliding sleeve 13 is provided on the sliding hole 12. The contact sleeve column 21 is movably fitted in the sliding sleeve 13 and contacts with the inner wall of the sliding sleeve 13, so that the metal contact piece 11 can be ensured to be in conflict with the contact sleeve column 21 at different positions, and will not interfere with the up and down movement of the metal contact piece 11.

[0027] Furthermore, a first protrusion 22 and a second protrusion 23 are provided on the side wall of the abutment sleeve 21, which are bent and arched toward the inner wall of the sliding sleeve 13. When the metal contact 11 is connected to the upper contact 19, the first protrusion 22 is just located on the inner wall of the sliding sleeve 13, and when the metal contact 11 is connected to the lower contact 20, the second protrusion 23 is just located on the inner wall of the sliding sleeve 13. The arrangement of the first protrusion 22 and the second protrusion 23 can ensure that the abutment sleeve 21 is in close contact with the inner wall of the sliding sleeve 13 when needed.

[0028] Furthermore, the abutment sleeve 21 has an axially deformable groove 24 on its side wall. It should be noted that the abutment sleeve 21 has good deformation recovery capability. The arrangement of the deformable groove 24 facilitates the first protrusion 22 and the second protrusion 23 to enter the inner wall of the sliding sleeve 13 .

[0029] Among them, the middle part of the metal contact 11 is fixedly connected to the lower end of the mounting seat 9, the contact piece 18 is located on the left side of the metal contact 11, the upper contact 19 and the lower contact 20 are located on the right side of the metal contact 11, and the right side of the metal contact 11 is connected with a contact head 14 located between the upper contact 19 and the lower contact 20. The metal contact 11 contacts the upper contact 19 and the lower contact 20 through the contact head 14, and the operation is reliable.

[0030] In order to ensure the sealing inside the glass tube 3, because the glass tube 3 is usually evacuated or filled with inert gas, the utility model provides a sealing guide sleeve 25 in the guide seat 4, and the push rod 8 passes through the sealing guide sleeve 25 to enter the glass tube 3. The sealing guide sleeve 25 is made of polytetrafluoroethylene, and an effective seal is formed between the sealing guide sleeve 25 and the push rod 8, and has an extremely low friction coefficient.

[0031] In addition, in order to prevent the magnetic block 6 from directly colliding with the guide seat 4 or the shell 1 at the top of the installation cavity 2 due to excessive speed when moving up and down, causing noise and damage to the internal structure, a buffer sleeve 26 is wrapped around the magnetic block 6. The upper end surface of the magnetic block 6 is exposed from the first buffer sleeve 26, and a buffer pad 27 is fixedly connected to the shell 1 at the top of the installation cavity 2.

[0032] It should also be pointed out that the terms used in the present invention, such as “front”, “rear”, “vertical”, “horizontal”, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel magnetic proximity switch, comprising a housing, wherein a mounting cavity with an opening facing downward is provided in the housing, and characterized in that: A glass tube is provided in the installation cavity, the upper end of the glass tube is sleeved with a guide seat, the lower end of the glass tube is sleeved with a sealing seat, the guide seat and the sealing seat are both fixed on the shell, the installation cavity is movably provided with a magnetic block on the upper side of the guide seat, a first compression spring is provided between the upper side of the magnetic block and the shell at the top of the installation cavity, the lower end of the magnetic block is fixedly connected to a push rod that penetrates downward through the guide seat and enters the glass tube, the lower end of the push rod is fixedly connected to a mounting seat, a second compression spring is provided between the upper side of the mounting seat and the guide seat, a metal contact is fixedly connected to the lower side of the mounting seat, a main terminal, a first auxiliary terminal and a second auxiliary terminal that penetrate from bottom to top into the glass tube are fixedly connected to the sealing seat, the main terminal is provided with a contact piece that conflicts with the metal contact, the first auxiliary terminal extends to the upper side of the metal contact and is fixedly connected to an upper contact, and the second auxiliary terminal is located at the lower side of the metal contact and is fixedly connected to a lower contact.

2. A novel magnetic proximity switch according to claim 1, characterized in that: The contact piece includes a contact sleeve column, the lower end of which is fixedly connected to the main terminal, a sliding hole is provided on the metal contact piece, a sliding sleeve is provided on the sliding hole, and the contact sleeve column is movably fitted in the sliding sleeve and contacts the inner wall of the sliding sleeve.

3. A novel magnetic proximity switch according to claim 2, characterized in that: The side wall of the abutting sleeve column is provided with a first protrusion and a second protrusion which are bent and arched toward the inner side wall of the sliding sleeve.

4. A novel magnetic proximity switch according to claim 3, characterized in that: The abutment sleeve has a deformable groove axially formed on the side wall.

5. A novel magnetic proximity switch according to claim 1, characterized in that: The middle part of the metal contact is fixedly connected to the lower end of the mounting seat, the contact piece is located on the left side of the metal contact, the upper contact and the lower contact are located on the right side of the metal contact, and the right side of the metal contact is connected to a contact head located between the upper contact and the lower contact.

6. A novel magnetic proximity switch according to claim 1, characterized in that: A sealing guide sleeve is arranged in the guide seat, and the push rod passes through the sealing guide sleeve and enters the glass tube.

7. A novel magnetic proximity switch according to claim 1, characterized in that: The magnetic block is wrapped with a buffer sleeve, the upper end surface of the magnetic block is exposed from the first buffer sleeve, and a buffer pad is fixedly connected to the shell at the top of the installation cavity.

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