Inertia switch

Abstract

The utility model discloses an inertia switch, which comprises a shell assembly, a counterweight pin shaft, a spring, a cathode guide piece and an external circuit, one end of the shell assembly is closed, and the other end of the shell assembly is provided with a through hole; an insulating section and a conductive section are arranged on the inner wall of the shell assembly in the length direction; the conductive section is connected with an anode of an external circuit through a wire; the counterweight pin shaft is coaxially arranged in the shell assembly; the large-diameter section I of the counterweight pin shaft is in contact fit with the inner wall surface of the shell assembly; the negative electrode guide piece penetrates through the through hole of the shell assembly to be fixedly arranged and is connected with the negative electrode of the external circuit through a wire. One end of the spring abuts against the annular step surface I of the counterweight pin shaft, and the other end of the spring abuts against the cathode guide piece; the utility model has the advantages of small volume, simple structure, high reliability and fast response.

Description

Technical Field

[0001] The utility model belongs to the technical field of switch control, and in particular relates to an inertia switch. Background Art

[0002] An inertial switch is a device that is sensitive to inertial signals. When it receives an inertial signal that exceeds the structural threshold, it can switch from open to closed. It is also called a threshold switch or an acceleration switch. It is an important device for sensing inertial signals in the current industrial field. Existing inertial switches mainly use a spring and mass block structure. When the inertial switch receives an inertial signal, the mass block overcomes the spring force and moves. When the mass block moves to a certain distance, it contacts the electrode contacts, thereby switching the switch from open to on.

[0003] Inertial switches are widely used in equipment such as fuses and automobile airbags, and are particularly widely used in electromechanical fuses. They are important components for projectiles or fuses to achieve launch release, trigger detonation, or self-destruction upon landing. In mechanical equipment, the switch needs to be automatically opened during movement, and electronic sensors are used to trigger it. First, electronic sensors have high requirements for the use environment. Second, electronic sensors are easily damaged and have low reliability. Finally, electronic sensors require a power supply and control system, which is costly and large in size, and cannot be installed in a limited installation space. Utility Model Content

[0004] In view of this, the utility model provides an inertia switch with small size, simple structure, high reliability and fast response.

[0005] The utility model is realized by the following technical solutions:

[0006] An inertia switch comprises: a housing assembly, a counterweight pin, a spring, a negative electrode guide and an external circuit;

[0007] One end of the shell component is closed and the other end is provided with a through hole, and the end where the through hole is located is insulated; the inner wall of the shell component is provided with an insulating section and a conductive section along the length direction; the insulating section is close to the closed end of the shell component, and the conductive section is close to the end where the through hole of the shell component is located; the conductive section is connected to the positive electrode of the external circuit through a wire;

[0008] The counterweight pin is a conductor; the counterweight pin is a cylindrical step structure I, including a large diameter section I and a small diameter section I, and the large diameter section I and the small diameter section I form an annular step surface I; the counterweight pin is coaxially arranged in the housing assembly, the large diameter section I of the counterweight pin is in contact with the inner wall surface of the housing assembly, and the end where the small diameter section I is located faces the end where the through hole of the housing assembly is located;

[0009] The negative electrode conductor is fixedly arranged through the through hole of the shell assembly; the negative electrode conductor is connected to the negative electrode of the external circuit through a wire;

[0010] One end of the spring abuts against the annular step surface I of the counterweight pin shaft, and the other end abuts against the negative electrode conductor;

[0011] In the initial state, the counterweight pin is in contact with the insulating section of the housing assembly;

[0012] Under the action of inertial acceleration, the counterweight pin moves along the shell assembly and compresses the spring. When the counterweight pin moves to the end of the small diameter section I and contacts the negative electrode conductor, the outer circumference of the large diameter section I of the counterweight pin contacts the conductive section of the shell assembly, and the inertial switch is closed.

[0013] Further, the housing assembly includes a shield, an insulating upper cover, a positive electrode conductor and an insulating base;

[0014] The inner diameters of the insulating upper cover and the positive electrode conductor are equal; the insulating upper cover, the positive electrode conductor and the insulating base are coaxially connected in sequence, and the aforementioned through hole is arranged on the insulating base; one end of the shield is open and the other end is closed, the shield is coaxially sleeved on the outer circumference of the insulating upper cover and the positive electrode conductor, and the open end of the shield is fixedly connected to the insulating base.

[0015] Furthermore, the protective cover is a transparent shell.

[0016] Furthermore, the negative electrode conductor is a cylindrical step structure II, including a large diameter section II and a small diameter section II, and the large diameter section II and the small diameter section II form an annular step surface II; the large diameter section II is located outside the shell assembly and is fixedly connected to the shell assembly; the small diameter section II passes through the through hole and enters the shell assembly; the spring is sleeved on the outer circumference of the small diameter section II and is against the annular step surface II.

[0017] Furthermore, the stiffness coefficient of the spring is:

[0018]

[0019] Wherein, m is the mass of the counterweight pin, a is the inertial acceleration of the counterweight pin, and x is the compression of the spring; let the axial shortest distance between the annular step surface Ⅰ of the counterweight pin and the conductive segment in the initial state be x1, x>x1.

[0020] Assume that in the initial state, the shortest axial distance between the end of the small diameter section I of the counterweight pin shaft and the negative electrode conductor is x2, and x1<x2.

[0021] Furthermore, the end of the small diameter section I of the counterweight pin is a spherical surface; and a shock-absorbing spring is provided at the end of the negative electrode conductor opposite to the counterweight pin.

[0022] Furthermore, a wire embedding groove for the conductor is provided on the inner wall surface of the shield, and a wire embedding groove is also provided on the positive electrode conductor at a position opposite to the wire embedding groove of the shield.

[0023] Furthermore, the spring is a conductor, and when the outer circumference of the large diameter section I of the counterweight pin shaft contacts the conductive section of the housing assembly, the inertia switch is closed.

[0024] Beneficial effects:

[0025] (1) When the inertial switch provided by the utility model is subjected to the effect of inertial acceleration, when the counterweight pin axis moves toward the negative electrode guide until it contacts the negative electrode guide, the inertial switch is closed, the external circuit is turned on, and a rapid response can be achieved. At the same time, the inertial switch is small in size and can be applied to limited installation space.

[0026] (2) The housing assembly provided by the utility model includes a protective cover, which can not only limit the position of the counterweight pin shaft, but also insulate and protect the internal structure from dust.

[0027] (3) The protective cover of the utility model is a transparent shell, which is convenient for observing the working status of the inertia switch.

[0028] (4) In the initial state of the utility model, the shortest axial distance between the annular step surface I of the counterweight pin and the conductive segment is x1, x>x1, and in the initial state, the shortest axial distance between the end of the small diameter segment I of the counterweight pin and the negative electrode conductor is x2, x1<x2; the smooth closing of the inertia switch can be ensured.

[0029] (5) The end of the small diameter section I of the counterweight pin shaft of the utility model is a spherical surface; the end of the negative electrode conductor opposite to the counterweight pin shaft is provided with a shock-absorbing spring to achieve buffering during impact, thereby avoiding damage to the mechanism due to collision after overload.

[0030] (6) The inner wall surface of the shield of the utility model is provided with a wire embedding groove for the wire, and a wire embedding groove is also provided on the positive electrode conductor at a position opposite to the wire embedding groove of the shield, which is used to connect the wire to the positive electrode conductor to ensure the reliability of the wiring.

[0031] (7) In the utility model, the spring is a conductor, and when the outer circumference of the large diameter section I of the counterweight pin contacts the conductive section of the housing assembly, the inertia switch is closed. By changing the set stiffness of the spring, another passage can be provided in the inertia switch to further improve the reliability of the inertia switch during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is an exploded view of the inertia switch of the utility model;

[0033] Figure 2 This is a cross-sectional view of the inertia switch of the utility model;

[0034] Among them, 1-protective cover, 2-insulating upper cover, 3-counterweight pin, 4-spring, 5-positive electrode conductor, 6-insulating base, 7-shock-absorbing spring, 8-negative electrode conductor. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0036] Embodiment 1:

[0037] This embodiment provides an inertial switch. Figure 1 and 2 , including: a housing assembly, a counterweight pin 3, a spring 4, a negative electrode guide 8 and an external circuit;

[0038] One end of the shell component is closed and the other end is provided with a through hole, and the end where the through hole is located is insulated; the inner wall of the shell component is provided with an insulating section and a conductive section along the length direction; the insulating section is close to the closed end of the shell component, and the conductive section is close to the end where the through hole of the shell component is located; the conductive section is connected to the positive electrode of the external circuit through a wire;

[0039] The counterweight pin shaft 3 is a conductor; the counterweight pin shaft 3 is a cylindrical step structure I, including a large diameter section I and a small diameter section I, and the large diameter section I and the small diameter section I form an annular step surface I; the counterweight pin shaft is coaxially arranged in the housing assembly, the large diameter section I of the counterweight pin shaft 3 is in contact with the inner wall surface of the housing assembly, and the end where the small diameter section I is located faces the end where the through hole of the housing assembly is located;

[0040] The negative electrode conductor 8 is fixedly arranged through the through hole of the shell assembly; the negative electrode conductor 8 is connected to the negative electrode of the external circuit through a wire;

[0041] One end of the spring 4 is coaxially sleeved on the outer circumference of the small diameter section I of the counterweight pin shaft 3, and the end thereof abuts against the annular step surface I of the counterweight pin shaft 3, and the other end abuts against the negative electrode conductor 8;

[0042] In the initial state, the counterweight pin 3 is in contact with the insulating section of the housing assembly;

[0043] Under the action of inertial acceleration, the counterweight pin 3 moves along the shell assembly and compresses the spring 4. When the counterweight pin 3 moves to the end of the small diameter section I and contacts the negative electrode conductor 8, the outer circumference of the large diameter section I of the counterweight pin 3 contacts the conductive section of the shell assembly, and the inertial switch is closed.

[0044] The inertial switch provided in this embodiment, when subjected to the inertial acceleration, when the counterweight pin shaft 3 moves toward the negative electrode guide 8 until it contacts the negative electrode guide 8, the inertial switch is closed, the external circuit is turned on, and a rapid response can be achieved. At the same time, the inertial switch in this embodiment is small in size and can be applied to limited installation space.

[0045] The shell assembly includes a shield 1, an insulating upper cover 2, a positive electrode conductor 5 and an insulating base 6;

[0046] The inner diameters of the insulating upper cover 2 and the positive electrode conductor 5 are equal; the insulating upper cover 2, the positive electrode conductor 5 and the insulating base 6 are coaxially connected in sequence, and the aforementioned through hole is set on the insulating base 6; the shield 1 is open at one end and closed at the other end, and the shield 1 is coaxially sleeved on the outer circumference of the insulating upper cover 2 and the positive electrode conductor 5, and the open end of the shield 1 is fixedly connected to the insulating base 6. The shield 1 insulates and protects the internal structure from dust.

[0047] In a specific embodiment, the shield 1 is a transparent shell, and the working state of the inertia switch can be observed.

[0048] In a specific embodiment, the two end faces of the positive electrode conductor 5 are respectively provided with corresponding coaxial annular bosses along the inner circumference; the end face of the insulating upper cover 2 connected to the positive electrode conductor 5 is provided with a coaxial annular groove along the inner circumference; one coaxial annular boss of the positive electrode conductor 5 is axially matched with the coaxial annular groove hole of the insulating upper cover 2, and the other coaxial annular boss is coaxially matched with the inner wall surface of the insulating base 6 to ensure the reliability of the connection.

[0049] The negative electrode conductor 8 is a cylindrical step structure II, including a large diameter section II and a small diameter section II, and the large diameter section II and the small diameter section II form an annular step surface II; the large diameter section II is located outside the shell assembly and is fixedly connected to the shell assembly; the small diameter section II passes through the through hole and enters the shell assembly; the spring 4 is sleeved on the outer circumference of the small diameter section II and abuts against the annular step surface II;

[0050] The stiffness coefficient of spring 4 is:

[0051]

[0052] Wherein, m is the mass of the counterweight pin 3, a is the inertial acceleration of the counterweight pin 3, and x is the compression of the spring; let the axial shortest distance between the annular step surface Ⅰ of the counterweight pin 3 and the conductive segment in the initial state be x1, x>x1.

[0053] Furthermore, to ensure that the inertia switch can be closed smoothly, in the initial state, the shortest axial distance between the end of the small diameter section I of the counterweight pin shaft 3 and the negative electrode conductor 8 is x2, and x1<x2;

[0054] In a specific embodiment, the end of the small diameter section I of the counterweight pin shaft 3 is spherical; the end of the negative electrode guide 8 opposite to the counterweight pin shaft 3 (i.e., the end of the small diameter section II) is provided with a shock-absorbing spring 7; buffering is achieved during impact, thereby avoiding damage to the mechanism due to collision after overload.

[0055] In a specific embodiment, the inner wall surface of the shield 1 is provided with a wire embedding groove, and a wire embedding groove is also provided on the positive electrode conductor 5 at a position opposite to the wire embedding groove of the shield 1, which is used to connect the wire to the positive electrode conductor 5 to ensure the reliability of the wiring.

[0056] In a specific embodiment, a wiring port and a lead groove are provided on the large diameter section II of the negative electrode conductor 8; a lead groove is also provided on the insulating base 6 at a position opposite to the lead groove for setting a wire connected to the negative electrode conductor 8 to ensure the reliability of the wiring.

[0057] In a specific embodiment, the insulating upper cover is made of hard nylon material; the counterweight pin shaft 3 is made of high-density brass.

[0058] Working principle:

[0059] In the initial state, the inertia switch is not subjected to overload force, the counterweight pin shaft 3 contacts the insulating section of the housing assembly under the elastic force of the spring 4, and the switch is in the disconnected state;

[0060] When the overload force applied to the inertia switch reaches the set value, the counterweight pin 3 compresses the spring 4 under the action of the overload force and moves along the axial direction of the shell assembly toward the negative electrode guide 8 until it contacts the negative electrode guide 8. The inertia switch is closed, the external circuit is turned on, and a corresponding trigger signal is generated.

[0061] Embodiment 2:

[0062] This embodiment provides an inertia switch based on the embodiment 1, wherein the spring 4 is a conductor; when the outer circumference of the large diameter section I of the counterweight pin shaft 3 contacts the conductive section of the housing assembly, the inertia switch is closed.

[0063] By providing another passage in the inertia switch, the reliability of the closing of the inertia switch during use is further improved.

[0064] Other technical features are the same as those in Example 1 and will not be repeated here.

[0065] In summary, the above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An inertia switch, characterized in that: include: Housing assembly, counterweight pin, spring, negative lead and external circuit; One end of the shell component is closed and the other end is provided with a through hole, and the end where the through hole is located is insulated; the inner wall of the shell component is provided with an insulating section and a conductive section along the length direction; the insulating section is close to the closed end of the shell component, and the conductive section is close to the end where the through hole of the shell component is located; the conductive section is connected to the positive electrode of the external circuit through a wire; The counterweight pin is a conductor; The counterweight pin shaft is a cylindrical step structure I, including a large diameter section I and a small diameter section I, and the large diameter section I and the small diameter section I form an annular step surface I; the counterweight pin shaft is coaxially arranged in the housing assembly, the large diameter section I of the counterweight pin shaft is in contact with the inner wall surface of the housing assembly, and the end where the small diameter section I is located faces the end where the through hole of the housing assembly is located; The negative electrode conductor is fixedly arranged through the through hole of the shell assembly; the negative electrode conductor is connected to the negative electrode of the external circuit through a wire; One end of the spring abuts against the annular step surface I of the counterweight pin shaft, and the other end abuts against the negative electrode conductor; In the initial state, the counterweight pin is in contact with the insulating section of the housing assembly; Under the action of inertial acceleration, the counterweight pin moves along the shell assembly and compresses the spring. When the counterweight pin moves to the end of the small diameter section I and contacts the negative electrode conductor, the outer circumference of the large diameter section I of the counterweight pin contacts the conductive section of the shell assembly, and the inertial switch is closed.

2. An inertia switch as claimed in claim 1, characterized in that: The shell assembly includes a shield, an insulating upper cover, a positive electrode conductor and an insulating base; The inner diameters of the insulating upper cover and the positive electrode conductor are equal; the insulating upper cover, the positive electrode conductor and the insulating base are coaxially connected in sequence, and the aforementioned through hole is arranged on the insulating base; one end of the shield is open and the other end is closed, the shield is coaxially sleeved on the outer circumference of the insulating upper cover and the positive electrode conductor, and the open end of the shield is fixedly connected to the insulating base.

3. An inertia switch as claimed in claim 2, characterized in that: The protective cover is a transparent shell.

4. An inertia switch as claimed in claim 1, characterized in that: The negative electrode conductor is a cylindrical step structure II, including a large diameter section II and a small diameter section II, and the large diameter section II and the small diameter section II form an annular step surface II; the large diameter section II is located outside the shell assembly and is fixedly connected to the shell assembly; the small diameter section II passes through the through hole and enters the shell assembly; the spring is sleeved on the outer circumference of the small diameter section II and abuts against the annular step surface II.

5. An inertia switch as claimed in claim 1, characterized in that: The stiffness coefficient of the spring is: Where m is the mass of the counterweight pin, a is the inertial acceleration of the counterweight pin, and x is the compression of the spring. Let the shortest axial distance between the annular step surface Ⅰ of the counterweight pin and the conductive segment in the initial state be x1, x>x1; Assume that in the initial state, the shortest axial distance between the end of the small diameter section I of the counterweight pin shaft and the negative electrode conductor is x2, and x1<x2.

6. An inertia switch as claimed in claim 1, characterized in that: The end of the small diameter section I of the counterweight pin shaft is a spherical surface; the end of the negative electrode conductor opposite to the counterweight pin shaft is provided with a shock-absorbing spring sheet.

7. An inertia switch as claimed in claim 2, characterized in that: The inner wall surface of the shield is provided with a wire embedding groove for the conductor, and a wire embedding groove is also provided at a position on the positive electrode conductor opposite to the wire embedding groove of the shield.

8. An inertia switch according to any one of claims 1 to 7, characterized in that: The spring is a conductor, and when the outer circumference of the large diameter section I of the counterweight pin shaft contacts the conductive section of the housing assembly, the inertia switch is closed.

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