An automatic power-on structure for fire alarms

Abstract

This invention discloses an automatic power-on structure for fire alarms, comprising a detector section and a mounting base that are interlocked. The detector section is used to implement the fire alarm function. The detector section includes a control circuit board, an elastic member, and a pushing member. The elastic member is mounted on the control circuit board, which has a contact pad. The elastic member has a serrated contact. The pushing member controls the serrated contact to contact or separate from the contact pad. When the serrated contact contacts the contact pad, the control circuit board is in an open-circuit state; when the serrated contact separates from the contact pad, the control circuit board is in a closed-circuit state. When the serrated contact contacts the contact pad, the fire alarm is de-energized; when the serrated contact separates from the contact pad, the fire alarm is energized. This solves the problem of existing products starting to work before use and ensures a sufficient product lifespan.

Description

Technical Field

[0001] This invention relates to fire detection and alarm technology, and more particularly to an automatic power-on structure for use in fire alarms. Background Technology

[0002] Currently, battery-powered fire detectors on the market are divided into two types: those with replaceable batteries and those with non-replaceable batteries. For detectors with replaceable batteries, the manufacturer typically includes the battery in the packaging box, requiring the customer to install it themselves upon receiving the product. For detectors with non-replaceable batteries, the battery is soldered onto the control circuit board at the factory. This means the product is already in working mode and consuming power before leaving the factory, which can shorten its lifespan if stored in the warehouse for too long. To address this issue, some technical solutions incorporate a mechanical switch. Before reaching the customer, the switch is off, and the product is in an inactive state. The switch must be closed before installation for the detector to function. However, some customers forget to close the switch before use, resulting in the detector being installed but not operational. Summary of the Invention

[0003] To address the shortcomings of the existing technology, this invention proposes an automatic power-on structure for fire alarms. This invention divides the fire detector into a detector part and a mounting base. Before leaving the factory, all components of the detector part can be assembled, and the battery is also soldered onto the control circuit board. However, the detector cannot work. It only starts working when the base is installed and the detector is screwed onto the base, preventing the switch from being forgotten to be closed during installation.

[0004] The technical solution of this invention is implemented as follows:

[0005] An automatic power-on structure for use in fire alarms includes: a detector section and a mounting base that are interlocked; the detector section is used to implement the fire alarm function; characterized in that...

[0006] The detector section includes a control circuit board, an elastic member, and a pushing member. The elastic member is mounted on the control circuit board, which has a contact pad.

[0007] The elastic member has a serrated contact, and the pushing member is used to control the serrated contact to contact or separate from the contact pad. When the serrated contact contacts the contact pad, the control circuit board is in an open circuit state; when the serrated contact separates from the contact pad, the control circuit board is in a closed circuit state.

[0008] In this invention, the control circuit board is mounted on several support members, and the control circuit board is fixedly connected to the several support members by several snap-fit ​​members.

[0009] In this invention, the control circuit board is provided with a solder pad, which has two positioning grooves for mounting elastic components.

[0010] In this invention, positioning plates are provided on both sides of one end of the elastic member, and a positioning buckle is provided in the middle of the positioning plate. The positioning plate is inserted into the positioning groove, and the positioning buckle restricts the movement of the positioning plate in the positioning groove.

[0011] In this invention, the elastic member has an elastic arm located at one end of the serrated contact, and the other end of the serrated contact is provided by a top plate.

[0012] In this invention, the pushing member has a connecting arm that is elastic, wherein a top post is provided on the top surface of the connecting arm. When the control circuit board is in an open circuit state, the top post is located below the top plate, and the serrated contact contacts are in contact with the contact pad.

[0013] In this invention, a support protrusion is provided on the ground under the connecting arm, and an installation protrusion is provided on the mounting base. When the mounting base is connected to the detector part, the installation protrusion pushes the top plate upward through the support protrusion and the top column, so that the sawtooth contact and the contact pad are separated, and the control circuit board forms a loop state.

[0014] In this invention, the support protrusion has a wedge-shaped structure. When the mounting base is connected to the detector part, the mounting protrusion and the inclined surface of the support protrusion are first aligned, and then the mounting base is rotated so that the mounting protrusion pushes the support protrusion to shift.

[0015] In this invention, the detector control circuit board has a switching circuit, which includes a spring switch S1. When the spring switch S1 is open, the fire alarm is powered on; when the spring switch S1 is closed, the fire alarm is powered off.

[0016] In this invention, the spring switch S1 is used to control the MOSFET T61 circuit. When the spring switch S1 is closed, the MOSFET T61 circuit is not turned on; when the spring switch S1 is open, the MOSFET T61 circuit is turned on.

[0017] Implementing this invention in the automatic power-on structure of a fire alarm has the following beneficial effects:

[0018] This invention utilizes a spring-loaded switch. When the spring-loaded switch is open, the fire alarm is powered on; when it is closed, the fire alarm is powered off. This solves the problem of existing products activating before use and ensures a sufficient product lifespan. Attached Figure Description

[0019] Figure 1 This is a circuit diagram of the automatic power-on structure of the present invention;

[0020] Figure 2 This is a partially obscured view of the automatic power-on structure of the present invention;

[0021] Figure 3 This is a partial structural diagram of the detector section of the present invention;

[0022] Figure 4 This is a schematic diagram of the detector section of the present invention from another angle;

[0023] Figure 5 This is a partial structural diagram of the detector section of the present invention;

[0024] Figure 6 This is a partially obscured view of the automatic power-on structure of the present invention, mainly showing the working state of the detector;

[0025] Figure 7 This is a schematic diagram of the structure of the elastic member of the present invention;

[0026] Figure 8 This is a schematic diagram of the elastic component of the present invention from another angle;

[0027] Figure 9 This is a schematic diagram of the elastic component of the present invention from another angle;

[0028] Figure 10 This is a schematic diagram showing the installation of the elastic component and the control circuit board of the present invention;

[0029] Figure 11 This is a schematic diagram of the control circuit board of the present invention;

[0030] Figure 12 This is a partial structural diagram of the detector section of the present invention;

[0031] Figure 13 This is a partially obscured view of the mounting base of the present invention;

[0032] Figure 14 This is a partial structural diagram of the detector section of the present invention;

[0033] Figure 15 This is a schematic diagram showing the installation of the detector part and the mounting base of the present invention;

[0034] The reference numerals in the attached figures are as follows: 10-detector part, 101-control circuit board, 101'1-pad, 101'2-contact pad, 101'3-positioning groove, 102-support member, 103-clamping member, 104-elastic member, 104'1-positioning plate, 104'2-positioning buckle, 104'3-elastic arm, 104'4-serrated contact, 104'5-top plate, 105-pushing member, 105'1-connecting arm, 105'2-top column, 105'3-support protrusion, 20-mounting base, 201-slot, 202-mounting protrusion. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0036] To address the technical problem of forgetting to close the switch when installing fire alarms, such as... Figures 1 to 15 As shown, this invention proposes an automatic power-on structure for a fire alarm, including a detector section 10 and a mounting base 20 that are interlocked. The detector section 10 is used to implement the fire alarm function. The detector section 10 includes a control circuit board 101, an elastic member 104, and a pushing member 105. The elastic member 104 is mounted on the control circuit board 101, which has a contact pad 101'2. The elastic member 104 has a serrated contact 104'4. The pushing member 105 is used to control the serrated contact 104'4 to contact or separate from the contact pad 101'2. When the serrated contact 104'4 contacts the contact pad 101'2, the control circuit board 101 is in an open circuit state; when the serrated contact 104'4 separates from the contact pad 101'2, the control circuit board 101 is in a closed circuit state, and the fire alarm starts working.

[0037] In this embodiment, specifically, the control circuit board 101 is mounted on several support members 102, and the control circuit board 101 is fixedly connected to the support members 102 by several snap-fit ​​members 103. The control circuit board 101 is provided with a solder pad 101'1, and the solder pad 101'1 is provided with two positioning grooves 101'3, which are used to install the elastic member 104.

[0038] The elastic member 104 has positioning plates 104'1 on both sides of one end, and a positioning buckle 104'2 in the middle of the positioning plate 104'1. The positioning plate 104'1 is inserted into the positioning groove 101'3, and the positioning buckle 104'2 restricts the movement of the positioning plate 104'1 in the positioning groove 101'3.

[0039] The elastic member 104 has an elastic arm 104'3 located at one end of the serrated contact 104'4, and the other end of the serrated contact 104'4 is provided by the top plate 104'5.

[0040] The pushing component 105 has a connecting arm 105'1, which is elastic. A top post 105'2 is provided on the top surface of the connecting arm 105'1. When the control circuit board 101 is in an open circuit state, the top post 105'2 is located below the top plate 104'5, and the serrated contact 104'4 contacts the contact pad 101'2.

[0041] A support protrusion 105'3 is provided on the ground under the connecting arm 105'1, and a mounting protrusion 202 is provided on the mounting base 20. When the mounting base 20 is connected to the detector part 10, the mounting protrusion 202 pushes the top plate 104'5 upward through the support protrusion 105'3 and the top column 105'2, so that the sawtooth contact 104'4 is separated from the contact pad 101'2, and the control circuit board 101 forms a loop state.

[0042] The support protrusion 105'3 has a wedge-shaped structure, and the mounting base 20 has a slot 201 circumferentially provided. When the mounting base 20 is connected to the detector part 10, the mounting protrusion 202 is first aligned with the inclined surface of the support protrusion 105'3, and then the mounting base 20 is rotated so that the mounting protrusion 202 pushes the support protrusion 105'3 to shift. Finally, the mounting base 20 is engaged with the detector part 10 through the slot 201.

[0043] The detector control circuit board 101 has a switching circuit, which includes a spring switch S1. The elastic member 104 is the spring switch S1. When the spring switch S1 is open, the fire alarm is powered on; when the spring switch S1 is closed, the fire alarm is de-powered. The combination of the two implements the reverse logic switching principle (e.g., ...). Figure 1 (As shown).

[0044] Switching circuit principle description: When the detector section 10 is not mounted on the mounting base 20, switch S1 is in the closed state. MOSFET T61's GS (G-grade corresponds to attached...) Figure 1 Middle terminal 1, S-class corresponding accessories Figure 1 The voltage between terminals 2 and 3 is 0V, so T61 is not conducting. VCC cannot connect to the battery voltage, therefore VCC voltage is 0V and cannot power the downstream detector circuit. When the detector is mounted on the mounting base, switch S1 is in the open state. The voltage between the gate and source (GS) of MOSFET T61 is divided by R63 and R64 to make the GS voltage of T61 greater than the MOSFET's turn-on voltage. T61 then conducts, connecting VCC to the battery voltage. Therefore, VCC voltage equals the battery voltage, powering the downstream detector circuit.

[0045] The working principle of this invention is as follows: The control circuit board 101 has two pads, one of which is used to solder and fix one end of the spring switch. The other pad contacts the serrated contact of the other end of the spring switch; the spring switch enables circuit conduction between the two pads. When the product leaves the factory, the spring switch is in the state of conducting the two pads. The serrated contact side of the spring switch extends out of the circuit board, and the extended part is designed with a concave groove-shaped top plate 104'5. A top post 105'2 is provided below the top plate 104'5. The top of the top post 105'2 is normally in close contact with the bottom of the top plate 104'5. The back of the top post 105'2 is designed with a support protrusion 105'3. When the detector part 10 is installed on the mounting base 20, the mounting protrusion 202 provided on the mounting base 20 lifts the support protrusion 105'3, thereby lifting the serrated contact side of the switch spring switch through the top post 105'2. At this point, the serrated contact of the spring detaches from the pad on the control circuit board, creating an open circuit between the two pads on the circuit board.

[0046] When the detector is unscrewed from the mounting base, the spring force of the spring switch acts on the support 102. The top post 105'2 is provided with a connecting arm 105'1, which is elastic and has a long cantilever. Under the action of the spring force of the connecting arm 105'1, the top post 105'2 returns to its original shape, and the serrated contact 104'4 of the spring switch returns to its initial state, contacting the contact pad 101'2 on the control circuit board 101, thus connecting the two pads of the control circuit board 101. At this time, the detector does not work.

[0047] 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 and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An automatic power-on structure for use in fire alarms, comprising: The detector section and the mounting base are interlocked, and the detector section is used to realize the fire alarm function. Its characteristic is that... The detector section includes a control circuit board, an elastic member, and a pushing member. The elastic member is mounted on the control circuit board, which has a contact pad. The elastic member has a serrated contact, and the pushing member controls the serrated contact to contact or separate from the contact pad. When the serrated contact contacts the contact pad, the control circuit board is in an open-circuit state; when the serrated contact separates from the contact pad, the control circuit board is in a closed-circuit state. The control circuit board has a solder pad with two positioning grooves for mounting elastic components. The elastic member has positioning plates on both sides at one end, and a positioning buckle in the middle of the positioning plate. The positioning plate is engaged in the positioning groove, and the positioning buckle restricts the movement of the positioning plate within the positioning groove. The elastic member has an elastic arm located at one end of the serrated contact, and the other end of the serrated contact is provided with a top plate. The pushing member has a connecting arm that is elastic. A top post is disposed on the top surface of the connecting arm. When the control circuit board is in an open-circuit state, the top post is located below the top plate, and the serrated contacts are in contact with the contact pads. A support protrusion is provided on the ground under the connecting arm, and an installation protrusion is provided on the mounting base. When the mounting base is connected to the detector part, the installation protrusion pushes the top plate upward through the support protrusion and the top column, so that the sawtooth contact and the contact pad are separated, and the control circuit board forms a loop state.

2. The automatic power-on structure according to claim 1, characterized in that, The control circuit board is mounted on several support members, and the control circuit board is fixedly connected to the support members by several snap-fit ​​components.

3. The automatic power-on structure according to claim 1, characterized in that, The support protrusion has a wedge-shaped structure. When the mounting base is connected to the detector part, the mounting protrusion and the inclined surface of the support protrusion are first aligned, and then the mounting base is rotated so that the mounting protrusion pushes the support protrusion to shift.

4. The automatic power-on structure according to any one of claims 1 or 2, characterized in that, The control circuit board has a switching circuit, which includes a spring switch S1. When the spring switch S1 is open, the fire alarm is powered on; when the spring switch S1 is closed, the fire alarm is powered off.

5. The automatic power-on structure according to claim 4, characterized in that, The spring switch S1 is used to control the MOSFET T61 circuit. When the spring switch S1 is closed, the MOSFET T61 circuit is not turned on; when the spring switch S1 is open, the MOSFET T61 circuit is turned on.

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