Symmetrical electromagnetic gas pump for gas alarm

Abstract

The invention relates to a symmetrical electromagnetic air pump for a gas alarm, which comprises a base, air inlet cavities and an air outlet cavity communicated with the air inlet cavities are arranged on the base, and the air inlet cavities are symmetrically arranged on two sides of the base and share the air outlet cavity; the base is provided with an active magnetic ring, the active magnetic ring is used for introducing alternating current to generate an alternating magnetic field, the air inlet cavity is connected with a vibrating diaphragm in a sealing manner, the vibrating diaphragm is connected to a movable spring plate, and the spring plate is connected with a permanent magnet capable of driving the vibrating diaphragm to perform simple harmonic vibration under the action of the alternating magnetic field; opening and closing valve clacks are arranged in the air inlet cavity and the air outlet cavity and used for closing the air outlet cavity in the air inlet process and closing the air inlet cavity in the air outlet process. By adopting bilateral symmetrical electromagnetic driving, acting force generates mirror symmetry Lorentz force through coils on the bilateral sides of the mass center, radial eccentric force is counteracted, mechanical balance is achieved, vibration of a pump body is reduced, and local fatigue cracking is avoided.

Description

Technical Field

[0001] This application relates to the field of electromagnetic air pump equipment technology, and more specifically, to a symmetrical electromagnetic air pump for a gas alarm. Background Technology

[0002] Currently, small electromagnetic diaphragm pumps are driven by electromagnetic DC motors instead of traditional pneumatic or mechanical transmissions. Precise flow regulation is achieved by controlling the reciprocating motion of the diaphragm through current pulses. Typical products include 12V / 24V DC miniature diaphragm pumps, which are only the size of a palm, weigh less than 500g, and support integration into portable devices.

[0003] Existing electromagnetic diaphragm pumps, driven by electric motors, have a lifespan dependent on the motor's lifespan. All moving parts eventually wear out; brushless motors typically have a lifespan of 20,000-30,000 hours, while brushed motors typically have a lifespan of only 3,000-5,000 hours. Brushed motors generate carbon dust during operation, which can cause short circuits, requiring regular cleaning, and the depletion of carbon brushes is irreversible. While brushless motors eliminate mechanical commutation wear, bearing issues become more pronounced under impact loads—this is particularly evident in the high-frequency reciprocating motion of diaphragm pumps.

[0004] To ensure reliability and lifespan, most gas alarms on the market use single-sided electromagnetic drive pumps, meaning the electromagnetic coil is only located on one side. This design has drawbacks: the single-sided magnetic field generates an asymmetric Lorentz force, resulting in significant cavitation noise, typically 70-85 dB, which is more than 15 dB higher than double-sided drive pumps. Furthermore, the need for additional vibration damping brackets and spring structures increases system complexity. Summary of the Invention

[0005] The purpose of this application is to provide a symmetrical electromagnetic air pump for a gas alarm, which can solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides a symmetrical electromagnetic air pump for a gas alarm, including a base, wherein the base is provided with an air inlet chamber and an air outlet chamber communicating with the air inlet chamber, the air inlet chambers are symmetrically arranged on both sides of the base and share the air outlet chamber; An active magnetic ring is provided on the base, which is used to generate an alternating magnetic field by passing in alternating current. A vibrating diaphragm is sealed and connected to the air intake chamber. The vibrating diaphragm is connected to a movable spring plate. A permanent magnet is connected to the spring plate, which can drive the vibrating diaphragm to vibrate in simple harmonic motion under the action of the alternating magnetic field. The air inlet chamber and the air outlet chamber are equipped with openable and closable valves, which are used to close the air outlet chamber during the air intake process and close the air inlet chamber during the air outlet process.

[0007] In an optional embodiment, the air inlet chamber is disposed on both sides of the air outlet chamber, the air outlet chamber is disposed on the top of the air inlet chamber, and an air outlet channel is provided between the air inlet chamber and the air outlet chamber. The base is provided with a cylindrical, side-opening air intake shell, the space of which constitutes the air intake chamber, and the vibrating diaphragm is laterally mounted on the air intake shell.

[0008] In an optional embodiment, the vibrating diaphragm comprises a flexible rubber diaphragm with a bowl-shaped structure, and a sealing buckle covers the lateral opening of the air intake chamber shell.

[0009] In an optional embodiment, the spring plate includes a strip plate, one end of which is fixedly connected to the base, and the other end extends toward the active magnetic ring, with the permanent magnet connected to the extended end of the spring plate near the active magnetic ring.

[0010] In an optional embodiment, the diaphragm is connected to the spring plate by fasteners, the fasteners including bolts passing through the middle of the spring plate and the center of the diaphragm, and nuts connected to the outer screw of the diaphragm.

[0011] In an optional embodiment, the active magnetic ring and the air outlet chamber are located at the center of the base, and the air inlet chamber shell, the spring plate, the vibrating diaphragm, and the permanent magnet are mirror-symmetrical with respect to the center line of the base.

[0012] In an optional embodiment, the base is provided with an air inlet and an air outlet, and the air outlet communicates with the air outlet chamber; The air intake chamber is connected to the air intake port through an air intake channel, and an air intake channel opening is provided on the wall of the air intake chamber. The air outlet chamber is connected to the air inlet chamber through an air outlet channel, and an air outlet opening is provided on the cavity wall at the bottom of the air outlet chamber.

[0013] In an optional embodiment, the valve disc includes a flexible valve disc plate and is press-fitted into the air inlet and the air outlet by a stop block; The valve disc includes a fixed part located at the root and a movable part that can open and close relative to the fixed part. The movable part corresponds to the positions of the air inlet and the air outlet. A stop block enclosure is provided on the cavity wall. The stop block enclosure has a semi-circular structure and an opening for the movable part to extend out. The stop block is fixedly installed in the stop block enclosure.

[0014] In an optional embodiment, the air outlet chamber includes an air outlet chamber shell disposed on the top of the base, the air outlet chamber shell including a square cavity shell, and a sealing rubber plug disposed on the top of the air outlet chamber shell.

[0015] In an optional embodiment, a housing is mounted on the base, the housing comprising an upper housing and a lower housing that are snapped together, the upper housing being provided with an air inlet / outlet and a power cord hole.

[0016] This invention optimizes the existing motor drive into an alternating magnetic field drive. The permanent magnet is fixed on a movable spring plate, and an alternating magnetic field is directly generated by an AC electromagnet to drive the spring plate and the permanent magnet to perform simple harmonic motion, thereby controlling the stretching and contraction of the vibrating diaphragm on the spring plate.

[0017] The stretching and contraction of the diaphragm enables the electromagnetic air pump to intake and exhaust air. Employing a bilaterally symmetrical electromagnetic drive, the force is transmitted through the coils on both sides of the center of mass to generate a mirror-symmetrical Lorentz force, which counteracts the radial eccentric force, achieving mechanical balance, reducing pump body vibration, and preventing localized fatigue cracking.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the symmetrical electromagnetic pump used in the gas alarm of this application. Figure 2 for Figure 1 A schematic diagram of the split structure; Figure 3 This is a schematic diagram of the base structure; Figure 4 This is a schematic diagram of the active magnetic ring. Figure 5 This is a schematic diagram of the assembly structure of the diaphragm, spring plate, and permanent magnet. Figure 6 This is a schematic diagram of the fit between the valve disc and the stop block; Figure 7 This is a schematic diagram of the structure of a sealing rubber stopper.

[0021] icon: 1-Base; 11-Intake chamber; 111-Intake chamber shell; 12-Air outlet chamber; 121-Air outlet chamber shell; 122-Sealing rubber plug; 13-Intake channel inlet; 14-Intake pipe inlet; 15-Outlet pipe inlet; 2-Active magnetic ring; 3-Vibrating diaphragm; 4-Spring plate; 5-Permanent magnet; 6-Valve disc; 61-Valve disc plate; 61a-Fixed part; 61b-Moving part; 62-Stop block; 63-Stop block housing; 7-Upper housing; 71-Air inlet / outlet; 72-Power cord hole; 8-Lower shell. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" 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 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 application based on the specific circumstances.

[0025] The gas alarm device in this application uses a symmetrical electromagnetic pump, which mainly avoids the technical problems of low reliability, high noise and short life of existing electromagnetic pumps by changing the driving form, optimizing the traditional motor drive to direct drive by alternating magnetic field, and adopting a symmetrical layout design.

[0026] See Figure 1 and combined Figures 2-7The gas alarm device of the present invention uses a symmetrical electromagnetic air pump. The main structure includes a base 1, an active magnetic ring 2, a vibrating diaphragm 3, a spring plate 4, a permanent magnet 5, and a valve disc 6 for controlling the unidirectional flow of gas.

[0027] The air pump also includes an upper housing 7 and a lower housing 8, which are interlocked to form a complete outer shell. The base 1 is an injection-molded one-piece structure, and its internal air circuit system is integrated.

[0028] An air inlet chamber 11 and an air outlet chamber 12 communicating with the air inlet chamber 11 are provided on the base 1. The air inlet chambers 11 are symmetrically arranged on both sides of the base 1 and share the air outlet chamber 12 in the middle position.

[0029] Specifically, the air inlet chamber 11 is located on both sides of the air outlet chamber 12, and the air outlet chamber 12 is located on top of the air inlet chamber 11. The air inlet chamber 11 and the air outlet chamber 12 are connected by an air outlet channel.

[0030] An active magnetic ring 2, which is a ring-shaped electromagnetic coil structure, is located at the top center of the base 1. The active magnetic ring 2 is used to pass in alternating current to generate an alternating magnetic field.

[0031] In this embodiment, a cylindrical, side-opening air intake chamber shell 111 is provided on the base 1, and a vibrating diaphragm 3 is sealed and connected to the side opening of the air intake chamber 11. The space of the air intake chamber shell 111 constitutes the air intake chamber 11.

[0032] The vibrating diaphragm 3 is a flexible, bowl-shaped rubber diaphragm, whose edge is sealed and fastened to the side opening of the air intake chamber shell 111, thereby forming a variable volume air chamber and ensuring the airtightness of the air intake chamber 11.

[0033] The middle part of the vibrating diaphragm 3 is connected to a movable spring plate 4. The spring plate 4 is a strip-shaped plate structure, with one end fixedly connected to the base 1 and the other end extending toward the active magnetic ring 2 in the middle of the base 1. A permanent magnet 5 is fixedly connected to the extended end of the spring plate 4 near the active magnetic ring 2. The permanent magnet 5 is preferably a high-performance permanent magnet such as neodymium iron boron.

[0034] When alternating current is applied to the active magnetic ring 2, the generated alternating magnetic field interacts with the permanent magnet 5, producing a periodic Lorentz force that drives the permanent magnet 5 and causes the spring plate 4 to perform simple harmonic motion with its fixed end as the fulcrum.

[0035] The vibration of the spring plate 4 causes the vibrating diaphragm 3 connected to the spring plate 4 to stretch and contract periodically, thereby changing the volume of the air intake chamber 11 and realizing the pumping function.

[0036] In order to achieve unidirectional gas flow, an openable and closable valve 6 is provided in the inlet chamber 11 and the outlet chamber 12, which can close the outlet chamber 12 during the gas intake process and close the inlet chamber 11 during the gas exhaust process.

[0037] Specifically, the base 1 is provided with an air inlet 14 and an air outlet 15. The air outlet 15 is connected to the air outlet chamber 12. The air inlet chamber 11 is connected to the air inlet 14 through an air inlet channel. An air inlet channel 13 is provided on the cavity wall of the air inlet chamber 11 to connect the air inlet chamber 11 with the air inlet 14 provided on the base 1.

[0038] The air outlet chamber 12 and the air inlet chamber 11 are connected by an air outlet channel. An air outlet channel opening is provided on the cavity wall at the bottom of the air outlet chamber 12 to connect the air outlet chamber 12 and the air inlet chamber 11.

[0039] The valve disc 6 is structured at the air inlet 13 and the air outlet. The valve disc 6 includes a flexible valve disc 61 and a stop 62 for press-fitting the valve disc 61. The valve disc 61 is press-fitted onto the air inlet 13 and the air outlet by the stop 62.

[0040] The valve disc 61 includes a fixed part 61a located at the root and a movable part 61b that can open and close relative to the fixed part 61a. The movable part 61b corresponds to the positions of the air inlet 13 and the air outlet.

[0041] A semi-circular baffle housing 63 is provided on the cavity wall, which has an opening for the movable part 61b of the valve disc 61 to extend out. The baffle 62 is fixedly installed inside the baffle housing 63, pressing the fixed part 61a of the valve disc 61, while its movable part 61b can open or close the passage under the action of external air pressure difference.

[0042] The working principle of the electromagnetic air pump includes: when the spring plate 4 follows the simple harmonic vibration of the permanent magnet 5, and at the same time drives the vibrating diaphragm 3 to stretch outward in both directions, the volume of the air intake chamber 11 increases and the internal air pressure decreases. At this time, the valve disc 61 at the air intake channel 13 opens under the action of external air pressure, and the gas enters the air intake chamber 11 through the air intake pipe 14 and the air intake channel.

[0043] The valve disc 61 at the air outlet remains closed due to its own elasticity and air pressure, preventing gas backflow. When the vibrating diaphragm 3 contracts and moves closer together, the volume of the air inlet chamber 11 decreases, and the internal air pressure increases. At this time, the valve disc 61 at the air inlet 13 closes, preventing gas backflow, while the valve disc 61 at the air outlet opens under the action of internal air pressure, forcing gas into the air outlet chamber 12, and finally pumping it out through the air outlet 15 provided on the base 1.

[0044] The gas alarm in this application uses a symmetrical electromagnetic air pump, which is a key technical improvement direction. The entire drive system adopts a double-sided symmetrical electromagnetic drive form.

[0045] Specifically, the active magnetic ring 2 and the air outlet chamber 12 are located in the center of the base 1. The air inlet chamber shell 111, the spring plate 4, the vibrating diaphragm 3, and the permanent magnet 5 are arranged in two sets and are mirror-symmetrically arranged with respect to the center line of the base 1.

[0046] This symmetrical structure ensures that the Lorentz forces on the two permanent magnets 5 are equal in magnitude, opposite in direction, and act along the same straight line, forming a mirror-symmetric mechanical system.

[0047] The double-sided symmetrical electromagnetic drive is adopted, so that the force is generated through the center of mass and the double-sided coil to generate a mirror-symmetrical Lorentz force, which counteracts the radial eccentric force to achieve mechanical balance, reduce pump body vibration, and avoid local fatigue cracking.

[0048] The resulting technical benefits include the fact that the resultant force of the driving force passes through the overall center of mass of the pump body, effectively offsetting the radial eccentric torque, which significantly reduces the vibration and noise of the pump body during operation, and ensures a stable and reliable service life.

[0049] Compared to traditional single-sided driven air pumps, the cavitation noise of this invention can be reduced by more than 15dB, with a typical value of less than 70dB. At the same time, it eliminates the need for additional complex vibration damping spring supports, simplifying the overall structure.

[0050] By optimizing the traditional lengthy energy conversion path of electrical energy → motor rotation → mechanical transmission → diaphragm movement into a direct driving path of electrical energy → magnetic energy → mechanical energy.

[0051] By eliminating the DC motor and complex motor controller, the circuit system is significantly simplified, requiring only AC power to be supplied to the active magnetic ring 2, reducing the risk of failure due to electronic controller malfunction (accounting for more than 60% of the failure rate of traditional pumps), and the mechanical structure is also greatly simplified.

[0052] The pump body core consists of a simple transmission chain consisting of an active magnetic ring 2, a permanent magnet 5, a spring plate 4, and a diaphragm. This eliminates the need for motor installation space and transmission components, allowing the air pump to be miniaturized to the greatest extent possible and making it easier to integrate into portable gas alarms and other devices.

[0053] The principle of the electromagnetic air pump is based on Ampere's law. An alternating magnetic field drives a permanent magnet to perform simple harmonic motion, which controls the air intake and exhaust of the diaphragm pump. Essentially, it is a highly efficient conversion process of electrical energy → magnetic energy → mechanical energy. Thanks to its simple mechanical structure, the system's operational stability is significantly improved.

[0054] It consists of only three modules: AC active magnetic ring 2, diaphragm pump, and housing. Compared with traditional electromagnetic diaphragm pumps, it saves the motor and motor controller, thus reducing production costs.

[0055] Meanwhile, by eliminating easily worn parts such as motor brushes and bearings, the number of moving parts is reduced, significantly improving the system's operational stability and reliability, and its theoretical working life far exceeds that of traditional air pumps that rely on motor life.

[0056] The diaphragm 3 can be reliably connected to the spring plate 4 via fasteners. A through hole is provided in the middle of the spring plate 4 and at the center of the diaphragm 3, through which a bolt passes from the inside and is locked with a nut on the outer threaded rod of the diaphragm 3.

[0057] The air outlet chamber 12 can be formed by a square air outlet chamber shell 121 set on the top of the base 1. Its top can be sealed by a sealing rubber plug 122, which maintains the airtight effect of the air outlet chamber 12 while facilitating maintenance.

[0058] The housing mounted on the base 1 is composed of an upper housing 7 and a lower housing 8 connected by screws. The upper housing 7 has an air inlet / outlet hole 71 corresponding to the air inlet 14 and the air outlet 15, as well as a power cable hole 72 for leading out the power cable of the active magnetic ring 2.

[0059] The symmetrical electromagnetic air pump for gas alarms provided by this invention achieves a comprehensive technical effect of low noise, high reliability, long life, compact structure and low cost by adopting direct drive of alternating magnetic field and bilateral symmetrical structure design. It is especially suitable for gas detection fields with strict requirements on reliability, size and noise.

[0060] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0061] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A symmetrical electromagnetic air pump for a gas alarm, characterized in that, Includes a base, on which an air inlet chamber and an air outlet chamber communicating with the air inlet chamber are provided. The air inlet chambers are symmetrically arranged on both sides of the base and share the air outlet chamber. An active magnetic ring is provided on the base, which is used to generate an alternating magnetic field by passing in alternating current. A vibrating diaphragm is sealed and connected to the air intake chamber. The vibrating diaphragm is connected to a movable spring plate. A permanent magnet is connected to the spring plate, which can drive the vibrating diaphragm to vibrate in simple harmonic motion under the action of the alternating magnetic field. The air inlet chamber and the air outlet chamber are equipped with openable and closable valves, which are used to close the air outlet chamber during the air intake process and close the air inlet chamber during the air outlet process.

2. The symmetrical electromagnetic gas pump for a gas alarm according to claim 1, characterized in that, The air inlet chamber is located on both sides of the air outlet chamber, the air outlet chamber is located at the top of the air inlet chamber, and an air outlet channel is provided between the air inlet chamber and the air outlet chamber. The base is provided with a cylindrical, side-opening air intake shell, the space of which constitutes the air intake chamber, and the vibrating diaphragm is laterally mounted on the air intake shell.

3. The symmetrical electromagnetic gas pump for a gas alarm according to claim 2, characterized in that, The vibrating diaphragm includes a flexible rubber diaphragm with a bowl-shaped structure, and a sealing buckle covers the lateral opening of the air intake chamber shell.

4. The symmetrical electromagnetic gas pump for a gas alarm according to claim 1, characterized in that, The spring plate includes a strip plate, one end of which is fixedly connected to the base, and the other end extends toward the active magnetic ring. The permanent magnet is connected to the extended end of the spring plate near the active magnetic ring.

5. The symmetrical electromagnetic gas pump for a gas alarm according to claim 1, characterized in that, The vibrating diaphragm is connected to the spring plate by fasteners, the fasteners including bolts passing through the middle of the spring plate and the center of the vibrating diaphragm, and nuts connected to the screws on the outer side of the vibrating diaphragm.

6. The symmetrical electromagnetic gas pump for a gas alarm according to claim 2, characterized in that, The active magnetic ring and the air outlet chamber are located in the center of the base, and the air inlet chamber shell, the spring plate, the vibrating diaphragm and the permanent magnet are mirror-symmetrical with respect to the center line of the base.

7. The symmetrical electromagnetic gas pump for a gas alarm according to any one of claims 1-6, characterized in that, The base is provided with an air inlet and an air outlet, and the air outlet communicates with the air outlet chamber; The air intake chamber is connected to the air intake port through an air intake channel, and an air intake channel opening is provided on the wall of the air intake chamber. The air outlet chamber is connected to the air inlet chamber through an air outlet channel, and an air outlet opening is provided on the cavity wall at the bottom of the air outlet chamber.

8. The symmetrical electromagnetic gas pump for a gas alarm according to claim 7, characterized in that, The valve disc includes a flexible valve disc plate, which is pressed into the air inlet and the air outlet by a stop block; The valve disc includes a fixed part located at the root and a movable part that can open and close relative to the fixed part. The movable part corresponds to the positions of the air inlet and the air outlet. A stop block enclosure is provided on the cavity wall. The stop block enclosure has a semi-circular structure and an opening for the movable part to extend out. The stop block is fixedly installed in the stop block enclosure.

9. The symmetrical electromagnetic gas pump for a gas alarm according to claim 7, characterized in that, The air outlet chamber includes an air outlet chamber shell disposed on the top of the base. The air outlet chamber shell includes a square cavity shell, and a sealing rubber plug is disposed on the top of the air outlet chamber shell.

10. The symmetrical electromagnetic gas pump for a gas alarm according to claim 7, characterized in that, The base is equipped with a housing, which includes an upper housing and a lower housing that are snapped together. The upper housing is provided with an air inlet / outlet and a power cord hole.

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