Electromagnetic air pump, active air inlet gas detection system and gas detector

Abstract

The invention discloses an electromagnetic air pump, an active air inlet gas detection system and a gas detector, relates to the technical field of gas detection, and solves the problem that an air pump in the prior art cannot meet the use scene of long endurance and continuous and uniform air transmission. The electromagnetic air pump comprises a pump body, the pump body is provided with a diaphragm assembly matched with the suction end and the pump-out end of the pump body, the diaphragm assembly is connected with a bowl-shaped air bag in a matched mode, and a cavity is formed between the bowl-shaped air bag and the diaphragm assembly; a force application transmission mechanism connected with the bowl-shaped air bag is movably arranged on the pump body, a permanent magnet is arranged on the force application transmission mechanism, an electromagnet is arranged on the pump body, and the electromagnet is used for controlling the permanent magnet to move in a reciprocating mode so as to drive the bowl-shaped air bag to deform or move, and therefore the size of the cavity can be adjusted. According to the electromagnetic air pump, by arranging the stress application transmission mechanism, the requirement for electromagnetic driving force between the electromagnet and the permanent magnet can be lowered, meanwhile, the electromagnetic air pump can be matched with the diaphragm assembly to obtain higher pumping pressure, and long-distance continuous air conveying is more stable.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to an electromagnetic air pump, a gas detection system with active air intake, and a gas detector. Background Art

[0002] With the rapid development of the electronics and automobile industries, there are more and more manufacturing plants. Various toxic and harmful gases are used or produced during the production process. If they are not managed or used properly, they will leak into the working environment. These gases are often in low concentrations and are not easy to detect. However, if production workers work in an environment with gas leakage, it will cause harm to their health and even life. It may also cause safety accidents such as explosions and fires, seriously endangering the safety of life and property. It is extremely important to adopt reasonable gas detection methods.

[0003] There are two main sampling methods for gas detectors: 1. Free diffusion; 2. Pump suction. Free diffusion gas detectors are inaccurate, have low precision, and slow response time for low-concentration gas detection. Traditional pump suction gas detectors mostly use electromagnetic pumps and diaphragm pumps based on motor principles. The motor drives the eccentric shaft to deform the bowl-shaped airbag, and then uses the unidirectional guide of the diaphragm to make the gas flow to the surface of the gas sensor. The biggest problem with pumps with this working principle is that the motor has a short life / high cost. Whether it is a brushed motor or a brushless motor, the continuous service life is difficult to exceed one year, and the cost of a brushless motor is very high. At the same time, the suction of the pump and the gas flow generated cannot be adjusted and fluctuate greatly.

[0004] In conventional electromagnetic pumps, for example, Chinese utility model patent with publication number CN116877384A discloses a magnetically driven air pump, including a magnetic driving component and a gas compression component; the magnetic driving component includes a permanent magnet and a first coil arranged around the permanent magnet; the first coil is connected to a power supply component, and the permanent magnet is caused to reciprocate up and down along the radial direction of the magnetic driving component under the action of electric current; the gas compression component includes an airbag with an elastic accommodating space, and a cavity connected to the airbag and having an air cavity; the elastic accommodating space of the airbag is compressed or stretched and restored under the up and down reciprocating motion of the permanent magnet, so that air is discharged or injected into the cavity.

[0005] This solution mainly relies on magnetic drive components to drive the airbag to do reciprocating motion, thereby achieving continuous gas supply. However, in the scenario of continuous long-distance gas delivery, due to the existence of air resistance, the driving force required for the electromagnetic pump itself is relatively large, and the continuity of airflow delivery is required to be high. In this scenario, this solution uses electromagnetic direct drive to move, but the magnetic force is limited, the heat is severe, the air pump efficiency and power are limited, and it is very easy to be damaged. It is only suitable for scenarios with low flow resistance and short-cycle gas delivery. The electromagnetic direct drive gas pumping method is difficult to meet the requirements of low energy consumption and long endurance scenarios.

[0006] For scenarios that require continuous low gas concentration detection, both of the above solutions have limitations.

[0007] For another application scenario: the detected area is far away from the monitoring area, and the commonly used solution is "controller + gas detector", that is, the gas detector is installed in the detected area, and the controller is installed in the monitoring area, and they communicate through signal lines or wirelessly. The disadvantage of this solution is that the cost of installing the controller is high and the installation and construction are complicated. Therefore, how to achieve low-cost, high-reliability long-distance gas detection is an urgent problem to be solved. Summary of the invention

[0008] In view of the deficiencies in the above-mentioned background technology, the present invention proposes an electromagnetic air pump, a gas detection system with active air intake, and a gas detector, which solves the problem that the air pumps in the prior art cannot meet the requirements of long-endurance and continuous and uniform gas transmission usage scenarios.

[0009] The technical solution of the present invention is implemented as follows: an electromagnetic air pump includes a pump body, the pump body is provided with a diaphragm assembly that cooperates with the suction end and the pump outlet end of the pump body, the diaphragm assembly is connected with the bowl-shaped air bag, and a cavity is formed between the bowl-shaped air bag and the diaphragm assembly; the pump body is movably provided with a force transmission mechanism connected to the bowl-shaped air bag, the force transmission mechanism is provided with a permanent magnet, and the pump body is provided with an electromagnet, which is used to control the reciprocating movement of the permanent magnet to drive the bowl-shaped air bag to deform or move, thereby adjusting the volume of the cavity.

[0010] Preferably, the force transmission mechanism comprises a permanent magnet bracket hinged on the pump body at one end, the middle part of the permanent magnet bracket is movably connected to the bowl-shaped airbag, and the permanent magnet is fixed at the other end of the permanent magnet bracket.

[0011] Preferably, an airbag pressure ring is provided outside the bowl-shaped airbag, and a pull rod is connected to the middle of the outer side of the bowl-shaped airbag. The pull rod can pull the bowl-shaped airbag to slide relative to the diaphragm assembly or can pull the bowl-shaped airbag to produce partial deformation, thereby changing the volume of the cavity between the two.

[0012] Preferably, the diaphragm assembly includes a diaphragm, a diaphragm pressure ring is provided on one side of the diaphragm, and the diaphragm is pressed against the pump body by the diaphragm pressure ring, the outer side of the diaphragm pressure ring cooperates with the bowl-shaped air bag, and the diaphragm pressure ring and the diaphragm are provided with a one-way air inlet and outlet structure that cooperates with the suction end and the pump outlet end.

[0013] Preferably, the one-way air inlet and outlet structure includes arc holes opened in pairs on the diaphragm, and movable air inlet baffle membrane and air exhaust baffle membrane are formed on the diaphragm through the arc holes; air hole I and air hole II are provided on the diaphragm pressure ring, the air inlet baffle membrane is arranged between the suction end and air hole I, and the air exhaust baffle membrane is arranged between the pump outlet end and air hole II; the size of the air inlet baffle membrane is larger than the orifice size of the suction end and less than or equal to the orifice size of air hole I, and the size of the air exhaust baffle membrane is larger than the orifice size of air hole II and less than or equal to the orifice size of the pump outlet end.

[0014] Preferably, the pump body is provided with a first positioning protrusion and a second positioning protrusion, the first positioning protrusion passes through the diaphragm and cooperates with a groove on the diaphragm pressure ring, and the second positioning protrusion is passed through the arc hole.

[0015] A gas detection system with active air intake, comprising an electromagnetic air pump as described in any of the above items, wherein the pump outlet end of the electromagnetic air pump is connected to an outlet pipe, the suction end is connected to a negative pressure air chamber, the negative pressure air chamber is connected to an air intake pipe, and a sensor module is provided between the negative pressure air chamber and the air intake pipe; the air intake pipe and the air outlet pipe are used to be connected to the area to be detected through pipelines respectively to form an airflow loop.

[0016] Preferably, the sensor module includes a gas sensor module and a flow sensor; the flow sensor is used to detect the gas flow rate flowing through the negative pressure air chamber in real time. When the difference between the detected flow rate and the set flow rate reaches a certain value, the driving current of the electromagnetic air pump is adjusted to adjust and correct the gas flow rate.

[0017] A gas detector with active air intake includes the active air intake gas detection system as described above, including an instrument housing, an air circuit housing is provided on the instrument housing, a negative pressure air chamber, an air inlet pipe and an air outlet pipe are arranged in the air circuit housing, and a slot for installing an electromagnetic air pump is provided on the air circuit housing; the sensor module is connected to the air circuit housing and the detection end of the sensor module is arranged on the side of the negative pressure air chamber close to the air inlet pipe; a display unit and a control unit are provided on the instrument housing, and the display unit, the sensor module and the electromagnetic air pump are all electrically connected to the control unit.

[0018] Preferably, the air circuit housing is provided with a locking piece for locking the pump body and the slot in a mating state; the air circuit housing is provided with gas channels respectively used to connect the suction end and the negative pressure air chamber, the pump outlet end and the outlet pipe; and the instrument housing is provided with a mounting plate.

[0019] Beneficial effects of the present invention: 1: The electromagnetic air pump of the present invention can realize the one-way flow of gas between the suction end and the pump outlet and the cavity by setting a diaphragm assembly. By setting a force transmission mechanism, the requirements for the electromagnetic driving force between the electromagnet and the permanent magnet can be reduced. At the same time, it can cooperate with the diaphragm assembly to obtain a higher pumping pressure, making the long-distance continuous gas delivery more stable. In the long-range use scenario, compared with the existing electromagnetic pumps and motor pumps, it has a longer service life, stronger continuity, higher working efficiency, and lower energy consumption and use cost.

[0020] 2: The active air intake gas detection system and gas detector of the present invention can realize the remote gas pump suction detection function, eliminating the remote controller and directly using the gas circuit of the system for remote gas transmission detection, saving the cost of detection equipment, reducing the complexity of the detection control structure and construction, and at the same time can also realize real-time detection and collection.

[0021] 3: The electromagnetic air pump as the power source is set at the outlet, and the negative pressure principle is used to drive the air flow. The design of the negative pressure air chamber can absorb the overshoot and slowness of the air flow and play a buffering role. When the electromagnetic air pump extracts gas in a pulsed manner, the air flow is also pulsed. At this time, the negative pressure air chamber plays a role in smoothing the air flow fluctuations, thereby ensuring the stability of the air flow through the surface of the gas sensor module and more accurate detection.

[0022] 4: The sensor module is further used in conjunction with the electromagnetic air pump of the present invention to compare with the set flow rate, and real-time correction is performed when there is a deviation to ensure that the actual flow rate is consistent with the target flow rate, thereby achieving precise gas flow control and correction and making the detection more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the cross-sectional structure of the air pump of the present invention; Figure 2 This is a schematic diagram of the explosion structure of the air pump of the present invention; Figure 3 This is a schematic diagram of the pump structure of the present invention; Figure 4 This is a schematic structural diagram of the pump body of the present invention from another perspective; Figure 5 This is a schematic diagram of the structure of the diaphragm assembly of the present invention; Figure 6 It is a schematic diagram of the structure of the gas detection system of the present invention; Figure 7 This is a schematic diagram of the explosion structure of the gas detector of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the gas detector of the present invention; Fig. 9 It is a schematic diagram of the gas circuit housing structure of the present invention; Fig.10 This is a schematic diagram of the hanging plate installation structure of the present invention.

[0025] In the figure: 1: pump body, 2: suction end, 3: pump outlet end, 4: diaphragm assembly, 5: bowl-shaped airbag, 6: afterburner transmission mechanism, 7: permanent magnet, 9: electromagnet, 10: cavity, 601: permanent magnet bracket, 501: airbag pressure ring, 502: pull rod, 401: diaphragm, 402: diaphragm pressure ring, 4011: intake baffle, 4012: exhaust baffle, 4021: air hole I, 4022: air hole II, 101: A positioning protrusion, 102: a second positioning protrusion, 11: an air outlet pipe, 12: a negative pressure air chamber, 13: an air inlet pipe, 14: a gas sensor module, 16: an instrument housing, 17: an air circuit housing, 18: a card slot, 19: a display unit, 20: a control unit, 171: a locking member, 172: a gas channel, 161: a mounting plate, 162: a right L-shaped housing, 163: an air circuit bracket, 164: a left housing, 165: a bottom plate. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figure 1 , 2 As shown, embodiment 1, an electromagnetic air pump, includes a pump body 1, the pump body provides an installation support base, the pump body 1 is provided with a diaphragm assembly 4 that cooperates with the suction end 2 and the pumping end 3 of the pump body 1, the diaphragm assembly 4 is connected with the bowl-shaped air bag 5, and a cavity 10 is formed between the bowl-shaped air bag 5 and the diaphragm assembly 4, and the diaphragm assembly can realize one-way flow of gas between the suction end and the pumping end and the cavity respectively.

[0028] In this embodiment, a booster transmission mechanism 6 connected to the bowl-shaped airbag 5 is movably provided on the pump body 1, a permanent magnet 7 is provided on the booster transmission mechanism 6, and an electromagnet 9 is fixedly provided on the pump body 1, and the electromagnet 9 is used to control the reciprocating movement of the permanent magnet 7 to drive the bowl-shaped airbag 5 to deform or move, so as to adjust the volume of the cavity 10. By providing the booster transmission mechanism, this embodiment can increase the force transmitted to drive the bowl-shaped airbag to move under the condition of constant driving force, or reduce the requirements for the electromagnetic driving force between the electromagnet and the permanent magnet, and can cooperate with the diaphragm assembly to obtain a higher pumping pressure, so that the long-distance continuous gas delivery is more stable.

[0029] When the present embodiment is in use, the electromagnet is fixedly mounted on the top of the pump body and is kept at a certain distance from the permanent magnet to make the drive more stable. When the coil of the electromagnet is supplied with current, a magnetic field is generated. The permanent magnet is attracted or repelled by the magnetic field and the magnetic poles of the electromagnet, resulting in a change in the position of the electromagnet. Then the direction of the coil current is changed. At this time, the direction of the magnetic field generated by the coil is also changed. The force exerted on the permanent magnet is also reversed, from attraction to repulsion or from repulsion to attraction. The direction of the change in the position of the permanent magnet is also changed. When the current in the coil is periodically changed, the movement direction of the permanent magnet is also periodically reciprocated. The movement of the permanent magnet drives the movement of the force transmission mechanism. The movement of the force transmission mechanism drives the movement of the bowl-shaped airbag. The bowl-shaped airbag changes back and forth periodically, driving the volume of the cavity to change. Then, under the action of the diaphragm assembly, a stable unidirectional airflow is formed between the suction end, the cavity, and the pump outlet.

[0030] When the electromagnet is working, it uses the magnetic effect of the current, that is, an alternating current of a certain frequency is passed through the coil, and the N / S poles generated at both ends of the coil change alternately. At this time, the magnetic pole of the permanent magnet on one end of the coil facing the coil is fixed, and the polarity of the side of the coil facing the permanent magnet changes alternately with the change of the direction of the coil current. At this time, the permanent magnet will be attracted or repelled alternately. Compared with the conventional drive method, the electromagnetic drive method reduces friction loss and improves conversion efficiency. At the same time, through the cooperation of the force transmission mechanism, the requirements for electromagnetic driving force are reduced, which not only avoids the problems of heating caused by long-term high-load operation, but also maintains a high driving force for the bowl-shaped airbag. Therefore, in the long-range use scenario, compared with the existing electromagnetic pumps and motor pumps, it has a longer service life, stronger continuity, higher working efficiency, lower energy consumption and lower use cost. In addition, to a certain extent, due to the reduced demand for the electromagnet load, the response time of the electromagnet to drive the permanent magnet to move can also be improved to a certain extent. At the same time, the frequency of the electromagnet can be controlled to change the speed of the permanent magnet's commutation movement, thereby changing the gas flow rate; the traction force of the bowl-shaped airbag can also be controlled by controlling the electromagnet current, thereby meeting the different driving force requirements for long-distance gas pumping and short-distance pumping.

[0031] Embodiment 2, based on Embodiment 1, the force transmission mechanism 6 comprises a permanent magnet bracket 601 hinged at one end on the pump body 1, the middle of the permanent magnet bracket 601 is movably connected to the bowl-shaped airbag 5, and the permanent magnet 7 is fixedly arranged at the other end of the permanent magnet bracket 601. In this embodiment, the force transmission mechanism 6 uses the lever principle to increase the force arm of the permanent magnet 7 matched with the electromagnet 9 under the electromagnetic force, and reduces the force arm of the bowl-shaped airbag to be driven to generate movement, thereby reducing the requirements for the electromagnetic force required for driving, and maintaining or improving the driving force transmitted to the bowl-shaped airbag.

[0032] In this embodiment, an alternating current of a certain frequency is passed through the electromagnet 9. Using the electromagnetic field principle, a strong magnetic field is generated at both ends of the electromagnet. The permanent magnet 7 is located at one end of the electromagnet and keeps a certain distance. The permanent magnet 7 generates an attraction or repulsion with the electromagnet 9 under the action of the magnetic field. When the current direction of the electromagnet 9 changes, the direction of its force also changes accordingly. The reciprocating motion of the permanent magnet 7 drives the regular reciprocating motion, and the unidirectional conduction principle of the diaphragm assembly 4 is used to generate a stable airflow in one direction. In this embodiment, the electromagnet drives the bowl-shaped airbag 5 to move by driving the permanent magnet 7 through the magnetic field. There is no physical connection between the electromagnet and the action part, that is, there is no physical friction, so it has higher efficiency and longer service life.

[0033] Specifically, an airbag pressure ring 501 is provided outside the bowl-shaped airbag 5, and a pull rod 502 is connected to the middle of the outer side of the bowl-shaped airbag 5. The pull rod 502 can pull the bowl-shaped airbag 5 to slide relative to the diaphragm assembly 4 or can pull the bowl-shaped airbag 5 to produce partial deformation, thereby changing the volume of the cavity 10 between the two. As a further optional implementation, in this embodiment, a hinge shaft is horizontally provided on the pull rod 502, and a long waist hole that satisfies the hinge shaft hinge and sliding is provided on the permanent magnet bracket 601, so that when the permanent magnet bracket moves outward and rotates under the drive of the permanent magnet, the hinge shaft can slide slightly in the long waist hole, which can maintain the outward pulling of the bowl-shaped airbag and avoid uneven force.

[0034] As an optional solution, the bowl-shaped airbag can be slidably matched with the internal diaphragm assembly, and the external airbag pressure ring plays a role in reducing the gap between the bowl-shaped airbag and the diaphragm assembly to a certain extent, thereby reducing air leakage during the sliding process. During the reciprocating movement of the permanent magnet 7, the middle part of the permanent magnet bracket 601 drives the bowl-shaped airbag 5 to slide relative to the diaphragm assembly 4, changing the position of the diaphragm assembly relative to the bowl-shaped airbag, thereby achieving the purpose of changing the volume of the cavity 10. During the reciprocating sliding of the bowl-shaped airbag relative to the diaphragm assembly, the airbag pressure ring moves with the bowl-shaped airbag and maintains the pressure on the bowl-shaped airbag.

[0035] In addition, the optional open end of the bowl-shaped airbag can be fixed to the outer wall of the diaphragm assembly and compressed by the airbag pressure ring to achieve a sealing effect. During the reciprocating movement of the permanent magnet 7, the middle part of the permanent magnet bracket drives the end face of the bowl-shaped airbag to deform, and is pulled outward or pressed inward, so that the volume of the cavity 10 between the end face of the bowl-shaped airbag and the end face of the diaphragm assembly changes reciprocatingly. This form has a small amount of gas pumped at a time, but is suitable for scenes with faster electromagnetic-driven reciprocating switching movements, and can also produce a more continuous and stable pumping airflow.

[0036] In this embodiment, the bowl-shaped airbag opening end is fixed relative to the outer wall of the diaphragm assembly, and the characteristics of high-frequency polarity conversion of the electromagnet are used to drive the deformation part of the bowl-shaped airbag to produce rapid periodic changes, thereby achieving uniform air intake and exhaust, and improving the flow stability of the transported gas. At the same time, the fixing of the bowl-shaped airbag opening end can also reduce the friction loss caused by relative sliding, as well as the problems of air leakage caused by long-term use friction.

[0037] Embodiment 3, on the basis of embodiment 2, as Figure 5 As shown, the diaphragm assembly 4 includes a diaphragm 401, a diaphragm pressing ring 402 is provided on one side of the diaphragm 401, and the diaphragm 401 is pressed against the pump body 1 by the diaphragm pressing ring 402, the outer side of the diaphragm pressing ring 402 cooperates with the bowl-shaped air bag 5, and the diaphragm pressing ring 402 and the diaphragm 401 are provided with a one-way air inlet and outlet structure that cooperates with the suction end 2 and the pump outlet 3.

[0038] Specifically, the one-way air inlet and outlet structure includes arc holes formed in pairs on the diaphragm 401, and the diaphragm 401 forms a movable air intake baffle 4011 and an air exhaust baffle 4012 through the arc holes. The diaphragm pressure ring 402 is provided with an air hole I 4021 and an air hole II 4022, the air intake baffle 4011 is arranged between the suction end 2 and the air hole I 4021, and the air exhaust baffle 4012 is arranged between the pump outlet end 3 and the air hole II 4022. In this embodiment, the arc hole is a semi-annular hole coaxially arranged with the air hole I or the air hole II, so that the air intake baffle and the air exhaust baffle are formed into approximately circular or semicircular blades, and the diaphragm can be made of rubber material, and the air intake baffle and the air exhaust baffle can be bent when the gas flows, so as to achieve the purpose of blocking the gas flow and one-way ventilation.

[0039] As a further embodiment, the size of the air inlet blocking membrane 4011 is larger than the orifice size of the suction end 2 and smaller than or equal to the orifice size of the pore I 4021 , and the size of the air exhaust blocking membrane 4012 is larger than the orifice size of the pore II 4022 and smaller than or equal to the orifice size of the pump outlet end 3 .

[0040] When the electromagnet drives the bowl-shaped airbag to deform and enlarge the cavity, negative pressure is generated in the cavity, and the intake baffle film 4011 and the exhaust baffle film 4012 are attracted to move or deform toward the side of the diaphragm pressure ring. At this time, the air hole II blocks the exhaust baffle film to form a seal, while the air hole I does not block the intake baffle film 4011. The intake baffle film bends into the air hole I, thereby sucking gas into the air from the suction end through the air hole I. During the exhaust process, the electromagnet drives the bowl-shaped airbag to deform and squeeze the cavity. At this time, the intake baffle film and the exhaust baffle film tend to move or deform toward the suction end and the pump outlet end. At this time, the small size of the suction end orifice blocks the intake baffle film to form a seal, and does not block the exhaust baffle film at the pump outlet end. The exhaust baffle film bends outward to achieve exhaust.

[0041] As a further embodiment, Figure 3 , 4 As shown in Figures 5 and 6, in order to prevent the diaphragm from being squeezed and deformed during assembly and causing leakage, a first positioning protrusion 101 and a second positioning protrusion 102 are provided on the pump body 1 in this embodiment. The first positioning protrusion 101 passes through the diaphragm 401 and cooperates with the groove on the diaphragm pressure ring 402, and the second positioning protrusion 102 is passed through the arc hole.

[0042] In this embodiment, the first positioning protrusion includes a protruding block fixedly arranged inside the pump body, and the diaphragm is provided with an opening to allow the protruding block to pass through. The diaphragm clamping ring is connected to the pump body by bolts, and the diaphragm is provided with a through hole to allow the bolts to pass through. The second positioning protrusion is an arc block, and the thickness of the arc block is greater than or equal to the thickness of the diaphragm. In the process of fixing and locking the diaphragm clamping ring with the bolts, the arc block can support the diaphragm clamping ring to avoid squeezing the diaphragm. The setting of the first positioning protrusion 101 and the second positioning protrusion 102 not only plays a role in positioning the diaphragm, but also can prevent the diaphragm from being squeezed and deformed, thereby producing a good sealing effect.

[0043] Embodiment 4, a gas detection system with active air intake, such as Figure 6 As shown, it includes the electromagnetic air pump as described in the above embodiment, the pump outlet 3 of the electromagnetic air pump is connected to the air outlet pipe 11, the suction end 2 of the electromagnetic air pump is connected to the negative pressure air chamber 12, the negative pressure air chamber 12 is connected to the air inlet pipe 13, and a sensor module is provided between the negative pressure air chamber 12 and the air inlet pipe 13. The air inlet pipe 13 and the air outlet pipe 11 are used to be connected to the area to be detected through pipelines to form an air flow loop.

[0044] Specifically, the sensor module includes a gas sensor module 14 and a flow sensor. The flow sensor detects the gas flow rate flowing through the negative pressure chamber 12 in real time. When the detected flow rate deviates from the set flow rate by a certain value, the driving current of the electromagnetic air pump is adjusted to adjust and correct the gas flow rate.

[0045] In this embodiment, the electromagnetic air pump as a power source is located at a position where the gas detection system is closely connected to the outlet pipe, and is located at the tail end of the system. A negative pressure air chamber is designed in front of the electromagnetic air pump. When the electromagnetic air pump is working, gas is extracted from the negative pressure air chamber to form a negative pressure in the negative pressure air chamber, and a pressure difference is formed between the area to be detected. Using the negative pressure principle, the gas in the area to be detected flows into the air inlet pipe under the action of the pressure difference. The gas sensor module is located at the rear end of the pipe mouth of the air inlet pipe, so that after the air flow flows into the air inlet, it directly reaches the detection end of the gas sensor for detection, and then the air flow flows through the flow sensor, which can detect the gas flow rate in the air path. After detection, the gas reaches the negative pressure air chamber, and finally is discharged through the outlet pipe under the action of the electromagnetic air pump. The design of the negative pressure air chamber plays a role in buffering the air flow. When the electromagnetic air pump extracts gas in a pulsed manner, the air flow is also pulsed. At this time, the negative pressure air chamber plays a role in smoothing the fluctuation of the air flow, thereby ensuring that the air flow flowing through the surface of the gas sensor module is stable and the detection is more accurate.

[0046] As a further implementation, the working state of the electromagnetic air pump is controlled by the control unit 20. When in use, the gas flow rate in the air circuit is first set. According to the set flow rate, a suitable driving current is output through the control unit 20 to the electromagnet of the electromagnetic air pump to drive the air pump to work. The flow sensor detects the gas flow rate in real time. When the detected flow rate deviates from the set flow rate to a certain value, the control unit 20 will automatically adjust the driving current of the air pump, increase or decrease the gas flow rate, so that it is consistent with the setting, to ensure that the gas detection result is stable and reliable, and to achieve the correction and regulation of the gas flow rate. At the same time, under the action of driving the air pump, the air circuit at the front end of the air pump is in a negative pressure state, which reduces the impact of the air flow on the gas sensor when the gas flows and stabilizes the air flow. When the air is drawn from one side of the outlet, the air flow / air pressure of the entire air circuit is relatively uniform, avoiding the uneven air flow pressure caused by the obstruction in front during the process of blowing air from the inlet to the inside to generate positive pressure, which may cause the air flow and air pressure facing the flow sensor to be relatively large, resulting in inaccurate measurement. The negative pressure air chamber plays a buffering role, similar to the capacitor in the circuit, and the best effect is achieved by combination. In addition, by using this system, thanks to the dynamic adjustable suction of the air pump, both long-distance and short-distance gas delivery detection can be achieved, which can solve the application problem of the scene where the detection area is far away from the monitoring area. In the scene where the detection area is far away from the monitoring area, the solution adopted is to extract gas from the detected area through a pipeline. The air resistance in the pipeline is very large. The air resistance of gas pipelines of different lengths is different. The air resistance affects the gas flow rate, and the gas flow rate directly affects the detection accuracy. Therefore, it is very necessary to ensure the stability of the gas flow rate in any scenario. The automatic adjustment function of the air pump driving current in this embodiment perfectly solves this problem. When the air resistance is very large, in order to achieve the set flow rate, a large driving power is required, which requires a high working efficiency of the air pump. The working efficiency of ordinary air pumps is low and the power consumption is very large. The system of this embodiment uses the principle of electromagnetic field to generate a magnetic field through electricity and generate force through the magnetic field. In this method, the "power source" and the bowl-shaped airbag are driven by the magnetic field, without physical connection, that is, without physical friction, so it has higher efficiency, minimizes power consumption, and guarantees a longer service life due to low loss. 。

[0047] Embodiment 5, a gas detector with active air intake, such as Figure 7 , 8 As shown in , 9, the gas detection system with active air intake as described in the above embodiment includes an instrument housing 16, an air circuit housing 17 is provided on the instrument housing 16, a negative pressure air chamber 12, an air inlet pipe 13 and an air outlet pipe 11 are arranged in the air circuit housing 17, and a card slot 18 for installing an electromagnetic air pump is provided on the air circuit housing 17.

[0048] The sensor module is connected to the gas circuit housing 17. In this embodiment, the detection end of the sensor module is arranged on the side of the negative pressure air chamber 12 close to the air inlet pipe 13, so that the gas entering through the air inlet pipe first flows through the sensor module and then enters the electromagnetic air pump through the negative pressure air chamber. The instrument housing 16 is provided with a display unit 19 and a control unit 20. The display unit 19, the sensor module, and the electromagnetic air pump are all electrically connected to the control unit 20.

[0049] In this embodiment, the instrument housing 16 includes a mounting plate 161, a right L-shaped shell 162, an air circuit support 163, a left shell 164, and a bottom plate 165, which are detachably connected. The mounting plate 161, the right L-shaped shell 162, the left shell 164, and the bottom plate 165 are detachably connected by screws to form a shell with a front opening. The air circuit support 163 is arranged inside the shell, and the display unit is clamped at the front opening. Specifically, one side of the display unit is connected to the front opening by a pin, and the other side is connected to the opening by a bayonet, which is convenient for disassembly during maintenance. The bottom plate 165 is provided with an opening to meet the passage of the inlet pipe 13 and the outlet pipe 11. In addition, the air circuit shell 17 is installed on the air circuit support 163, the electromagnetic air pump is embedded in the card slot 18, the control unit 20 is fixed on the right L-shaped shell 162, and the left shell 161 is buckled with the right L-shaped shell 162 by screws to protect the internal components. The bottom plate is installed at the bottom, and the mounting plate is installed at the back. The sensor module is installed on the front side, and the display unit is installed on the outside of the sensor module. While playing a display role, it can also press the sensor module to maintain its connection with the gas circuit housing.

[0050] As a further embodiment, a locking member 171 is provided on the gas circuit housing 17 for locking the pump body 1 in the matching state with the slot 18. The locking member is used to compress the pump body and play a fixing role. In this embodiment, the bottom of the locking member 171 is hinged or plugged and fixed on the gas circuit housing 17 on one side of the slot 18, and a bayonet is provided above the gas circuit housing 17 on the other side of the slot 18. The upper end of the locking member cooperates with the bayonet to achieve a snap connection, so that the electromagnetic air pump is firmly embedded in the slot 18 of the air pump housing.

[0051] As a further embodiment, the gas circuit housing 17 is provided with a gas channel 172 for connecting the suction end 2 and the negative pressure air chamber 12, the pump outlet end 3 and the air outlet pipe 11. In this embodiment, two gas channels are provided, which are opened in the gas circuit housing. One end of the two gas channels is provided in the card slot 18, which is used to connect with the suction end 2 and the pump outlet end 3 respectively after the air pump is installed, and the other end is connected to the negative pressure air chamber and the air outlet pipe 11 respectively.

[0052] In addition, a mounting plate 161 is provided on the instrument housing 16. Fig.10As shown, the power supply and communication input and output interfaces are integrated with the mounting plate by using the mounting plate, and the input and output terminals are designed as one body with the mounting plate. When installing, the interface on the mounting plate is connected to the external communication line. The back of the gas detector of the present invention is equipped with a terminal that plugs into the interface of the mounting plate. When installing, it is directly hung up, that is, fixed, and the signal line connection is completed at the same time, which is convenient for installation and replacement. In this embodiment, the sensor module is modularly designed, and the sensor module is uniformly connected to the control unit with a plug-in interface, without the need for wire connection. The detection end of the gas sensor is plugged into the negative pressure chamber. After opening the display unit, the gas sensor module can be directly unplugged, which is more convenient for replacement and maintenance.

[0053] In this gas detector, the existence of the negative pressure chamber solves the fluctuation of the air flow in the gas path very well. It is a buffer pool for the entire gas path, which makes the air pressure and air flow of the gas sensor detection port stable, thereby reducing the influence of air pressure and air flow factors on the detection accuracy. The gas sensor is adjacent to the air inlet pipe 13. The flowing gas first flows through the gas sensor and then flows into the flow sensor to detect the flow, ensuring that the flow rate of the gas sensor detection port is stable at the target value.

[0054] At the same time, the pump suction flow of this gas detector can be automatically adjusted. A target value is set. The flow sensor detects the flow value in the gas circuit in real time. When the gas flow is detected to deviate from the target value, the control unit adjusts the frequency of the current flowing through the electromagnet and changes the frequency of the reciprocating motion of the bowl-shaped airbag, thereby adjusting the pump suction flow and finally making it consistent with the target value. By utilizing the high conversion efficiency and strong suction of the electromagnetic air pump, gas can be extracted from a distant place, and after being detected by this gas detector, it is discharged into the original environment through the gas circuit. Therefore, it can be used in scenarios where the detection area is far away from the monitoring area, eliminating the controller equipment of traditional applications, saving costs, and improving reliability.

[0055] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electromagnetic air pump, characterized in that: The pump body (1) comprises a diaphragm assembly (4) matched with a suction end (2) and a pump discharge end (3) of the pump body (1), the diaphragm assembly (4) being matched with a bowl-shaped airbag (5), and a cavity (10) being formed between the bowl-shaped airbag (5) and the diaphragm assembly (4); a force transmission mechanism (6) connected with the bowl-shaped airbag (5) being movably provided on the pump body (1), a permanent magnet (7) being provided on the force transmission mechanism (6), and an electromagnet (9) being provided on the pump body (1), the electromagnet (9) being used to control the reciprocating movement of the permanent magnet (7) to drive the bowl-shaped airbag (5) to deform or move, thereby being able to adjust the volume of the cavity (10).

2. The electromagnetic air pump according to claim 1, characterized in that: The force transmission mechanism (6) comprises a permanent magnet bracket (601) with one end hinged to the pump body (1), the middle part of the permanent magnet bracket (601) is movably connected to the bowl-shaped airbag (5), and the permanent magnet (7) is fixedly arranged on the other end of the permanent magnet bracket (601).

3. The electromagnetic air pump according to claim 2, characterized in that: The bowl-shaped airbag (5) is provided with an airbag pressure ring (501) outside, and a pull rod (502) is connected to the middle of the outer side of the bowl-shaped airbag (5). The pull rod (502) can pull the bowl-shaped airbag (5) to slide relative to the diaphragm assembly (4) or can pull the bowl-shaped airbag (5) to produce partial deformation, thereby changing the volume of the cavity (10) between the two.

4. The electromagnetic air pump according to claim 3, characterized in that: The diaphragm assembly (4) comprises a diaphragm (401), a diaphragm pressing ring (402) is provided on one side of the diaphragm (401), and the diaphragm (401) is pressed against the pump body (1) by the diaphragm pressing ring (402), the outer side of the diaphragm pressing ring (402) cooperates with the bowl-shaped air bag (5), and the diaphragm pressing ring (402) and the diaphragm (401) are provided with a one-way air inlet and outlet structure that cooperates with the suction end (2) and the pump outlet end (3).

5. The electromagnetic air pump according to claim 4, characterized in that: The one-way air inlet and outlet structure comprises arc holes formed in pairs on the diaphragm (401), and a movable air inlet baffle (4011) and an air outlet baffle (4012) are formed on the diaphragm (401) through the arc holes; an air hole I (4021) and an air hole II (4022) are provided on the diaphragm pressure ring (402); the air inlet baffle (4011) is provided between the suction end (2) and the air hole I (4021), and the air outlet baffle (4012) is provided between the pump outlet end (3) and the air hole II (4022); the size of the air inlet baffle (4011) is larger than the hole size of the suction end (2) and smaller than or equal to the hole size of the air hole I (4021), and the size of the air outlet baffle (4012) is larger than the hole size of the air hole II (4022) and smaller than or equal to the hole size of the pump outlet end (3).

6. The electromagnetic air pump according to claim 4 or 5, characterized in that: The pump body (1) is provided with a first positioning protrusion (101) and a second positioning protrusion (102); the first positioning protrusion (101) passes through the diaphragm (401) and cooperates with a groove on the diaphragm pressure ring (402); and the second positioning protrusion (102) passes through the arc-shaped hole.

7. A gas detection system with active air intake, comprising the electromagnetic air pump according to any one of claims 1 to 6, characterized in that: The pump outlet end (3) of the electromagnetic air pump is connected to the air outlet pipe (11), the suction end (2) is connected to the negative pressure air chamber (12), the negative pressure air chamber (12) is connected to the air inlet pipe (13), and a sensor module is provided between the negative pressure air chamber (12) and the air inlet pipe (13); the air inlet pipe (13) and the air outlet pipe (11) are used to respectively connect to the area to be detected through pipelines to form an air flow loop.

8. The active air intake gas detection system according to claim 7, characterized in that: The sensor module comprises a gas sensor module (14) and a flow sensor; the flow sensor is used to detect the gas flow rate flowing through the negative pressure chamber (12) in real time, and when the difference between the detected flow rate and the set flow rate reaches a certain value, the driving current of the electromagnetic air pump is adjusted to adjust and correct the gas flow rate.

9. An active air intake gas detector, comprising the active air intake gas detection system according to claim 7 or 8, characterized in that: The invention comprises an instrument housing (16), an air circuit housing (17) being provided on the instrument housing (16), a negative pressure air chamber (12), an air inlet pipe (13) and an air outlet pipe (11) being arranged in the air circuit housing (17), and a slot (18) for installing an electromagnetic air pump being provided on the air circuit housing (17); the sensor module being connected to the air circuit housing (17) and a detection end of the sensor module being arranged on a side of the negative pressure air chamber (12) close to the air inlet pipe (13); and a display unit (19) and a control unit (20) being provided on the instrument housing (16), and the display unit (19), the sensor module and the electromagnetic air pump being electrically connected to the control unit (20).

10. The active air intake gas detector according to claim 9, characterized in that: The gas circuit housing (17) is provided with a locking member (171) for locking the pump body (1) in a mating state with the slot (18); the gas circuit housing (17) is provided with a gas passage (172) for connecting the suction end (2) and the negative pressure chamber (12), the pump outlet end (3) and the gas outlet pipe (11); and the instrument housing (16) is provided with a mounting plate (161).

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