CN218470472U

CN218470472U - Dust concentration sensor of integrated PCB coil diaphragm pump

Info

Publication number: CN218470472U
Application number: CN202222067681.6U
Authority: CN
Inventors: 吴智敏; 颜德宝; 黄美英
Original assignee: XIAMEN MAXMAC AIR TECHNOLOGY CO LTD
Current assignee: XIAMEN MAXMAC AIR TECHNOLOGY CO LTD
Priority date: 2022-08-08
Filing date: 2022-08-08
Publication date: 2023-02-10
Anticipated expiration: 2032-08-08

Abstract

The utility model relates to a dust concentration sensor of integrated PCB coil diaphragm pump, this dust concentration sensor include gas storage chamber, first gas passage and second gas passage. The gas reservoir has at least a partially deformable portion which is deformed partially to expand or contract the volume of the gas reservoir. The first end of first gas passage communicates in the external world, and the second end communicates in the gas storage chamber, and first gas passage is constructed as: the cross-sectional flow area of the first end is smaller than the cross-sectional flow area of the second end. The first end of second gas passage communicates in the gas storage chamber, and the second end communicates in the external world, and second gas passage is constructed: the cross-sectional flow area of the first end is smaller than the cross-sectional flow area of the second end. When the volume of the gas storage cavity is enlarged, the flow of the first gas channel is larger than that of the second gas channel, and when the volume of the gas storage cavity is reduced, the flow of the first gas channel is smaller than that of the second gas channel.

Description

Dust concentration sensor of integrated PCB coil diaphragm pump

Technical Field

The utility model relates to a sensor field, in particular to dust concentration sensor of integrated PCB coil diaphragm pump.

Background

With the acceleration of the industrialization process in China, the emission of particulate matters in the air is gradually increased, and the problem of environmental pollution caused by particulate matters in the air is more and more serious. In order to achieve a quantitative description of the air quality, the concentration of particulate matter in the air needs to be monitored. At present, methods for measuring the concentration of particulate matters at home and abroad are various, and the methods are divided into two major types from the aspect of particulate matter concentration detection, namely sampling methods and non-sampling methods. With the advance of technology, especially the rapid development in the optical technology and sensor industry, the advantage of using light scattering method for concentration measurement in non-sampling method has been more and more prominent.

In the related technology, the light scattering type dust concentration sensor mainly depends on a fan to suck gas in an environment into a gas chamber, a light source emits a light beam to irradiate into the gas chamber, particles in the gas chamber are scattered after being irradiated by light, at the moment, a photoelectric detector collects scattered light, photoelectric signal conversion is completed, and then converted electric signals are processed and calculated to obtain a concentration value of dust. However, the fan is bulky, which makes the dust concentration sensor not compact.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a dust consistency transmitter of integrated PCB coil diaphragm pump is favorable to the miniaturization of dust consistency transmitter.

In order to solve the technical problem, the utility model adopts the following technical scheme.

According to an aspect of the utility model, the utility model provides a dust concentration sensor of integrated PCB coil diaphragm pump, this dust concentration sensor includes: an air reservoir having at least a partially deformable portion that deforms to expand or contract the volume of the air reservoir; a first gas passage having a first end communicating with the outside and a second end communicating with the gas storage chamber, the first gas passage being configured to: the through-flow cross-sectional area of the first end is smaller than that of the second end; a second gas passage having a first end in communication with the gas reservoir and a second end in communication with the outside, the second gas passage being configured to: the through-flow cross-sectional area of the first end is smaller than that of the second end; when the volume of the gas storage cavity is enlarged, the flow of the first gas channel is larger than that of the second gas channel, and when the volume of the gas storage cavity is reduced, the flow of the first gas channel is smaller than that of the second gas channel.

In some embodiments of the present application, the dust concentration sensor further comprises a housing and a diaphragm; an air storage tank is arranged in the shell; the diaphragm is arranged in the shell, the diaphragm and the air storage groove enclose the air storage cavity, and the diaphragm can deform so as to enlarge or reduce the volume of the air storage cavity.

In some embodiments of the present application, the dust concentration sensor further includes a driving member, the driving member is connected to and drives the diaphragm to deform, so that the volume of the gas storage cavity is enlarged or reduced.

In some embodiments of the present application, the driving member includes a first magnetic member and a second magnetic member, the first magnetic member is connected to the diaphragm, and the second magnetic member is fixed outside the gas storage cavity; when the first magnetic part and the second magnetic part are excited and the magnetism of the first magnetic part is different from that of the second magnetic part, the opposite attraction is realized, and the diaphragm protrudes outwards to expand the volume of the air storage cavity; or when the first magnetic part and the second magnetic part are excited, and the first magnetic part and the second magnetic part have the same magnetism, the same poles repel each other, and the concave part of the diaphragm enables the volume of the air storage cavity to be reduced.

Some embodiments of this application, first magnetism spare is the permanent magnet, second magnetism spare is the coil when the coil passes through forward current, the magnetism that the coil produced with the magnetism of permanent magnet is different, and opposite poles attract mutually, the diaphragm evagination makes the volume in gas storage chamber enlarges when the coil passes through reverse current, the magnetism that the coil produced with the magnetism of permanent magnet is the same, and like poles repel each other, the diaphragm indent makes the volume in gas storage chamber reduces.

In some embodiments of the present application, the first magnetic member is a permanent magnet, and the second magnetic member is a coil; the dust concentration sensor also comprises a circuit board, and the circuit board is arranged in the shell and positioned outside the gas storage cavity; the circuit board comprises a substrate and a circuit attached to the substrate, and the coil is formed by circuit printing.

In some embodiments of the present application, the circuit board has a multi-layer board structure, and each layer board is printed with a coil to form a superimposed magnetic field.

In some embodiments of the present application, a mounting groove is further disposed in the housing, and the air storage groove is recessed in a bottom surface of the mounting groove; the dust concentration sensor further comprises a fixing seat, the fixing seat is used for clamping and fixing the diaphragm in the mounting groove, and the diaphragm and the gas storage groove are enclosed to form the gas storage cavity.

In some embodiments of the present application, a first communicating groove and a second communicating groove are further disposed in the housing, and the first communicating groove and the second communicating groove are recessed in a bottom surface of the mounting groove; when the diaphragm clamp is fixed in the mounting groove, the diaphragm and the first communicating groove enclose the first gas channel, and the second communicating groove encloses the second gas channel.

In some embodiments of the present application, the first gas passage and the second gas passage each have a gradually increasing cross-sectional flow area from the first end to the second end.

According to the above technical scheme, the embodiment of the utility model provides an at least have following advantage and positive effect:

the utility model discloses among the dust concentration sensor, when the part that can produce deformation in the gas storage chamber produced evagination deformation and made the volume of gas storage chamber enlarge, atmospheric pressure in the gas storage chamber was less than atmospheric pressure, and the gas storage chamber is inwards breathed in, because the through-flow sectional area of first end of first gas passage is less than the through-flow sectional area of second end, when external gas got into the gas storage chamber from first gas passage, the resistance constantly reduced, and the admission speed is fast. And the through-flow cross-sectional area of the second end of the second gas channel is larger than that of the first end, so that when external gas enters the gas storage cavity from the second gas channel, the resistance is continuously increased, and the gas inlet speed is low. Therefore, the amount of intake air of the first gas passage is larger than that of the second gas passage.

When the part that the gas storage cavity can produce deformation produces indent deformation and makes the volume of gas storage cavity reduce, atmospheric pressure in the gas storage cavity is greater than atmospheric pressure, and the gas storage cavity outwards exhausts, because the flow cross section area of the second end of first gas passageway is greater than the flow cross section area of first end, when the gas in the gas storage cavity was discharged the external world from first gas passageway, the resistance constantly increased, exhaust speed was slow. And the through-flow cross-sectional area of the first end of the second gas channel is smaller than that of the second end, so that when the gas in the gas storage cavity is discharged outside from the second gas channel, the resistance is continuously reduced, and the exhaust speed is high. Therefore, the amount of exhaust gas of the first gas passage is smaller than the amount of exhaust gas of the second gas passage.

So, the deformation of evagination or indent is repeated constantly to the part that the gas storage chamber can produce deformation, has just produced gas and has constantly got into the gas storage chamber from first gas passage to from the gas storage chamber through second gas passage exhaust process, realized gaseous flow, thereby need not install the fan and can accomplish the detection of dust concentration, be favorable to the product miniaturization.

Drawings

Fig. 1 is an exploded perspective view of a dust concentration sensor of an integrated PCB coil diaphragm pump according to an embodiment of the present invention.

FIG. 2 is a plan view of the second housing and air duct housing of FIG. 1.

Fig. 3 is a perspective view of the anchor block and diaphragm of fig. 1 installed in the mounting groove of fig. 2.

FIG. 4 is a schematic diagram of the gas storage chamber, the first gas passage and the second gas passage during the gas intake process.

FIG. 5 is a schematic view of the gas storage chamber, the first gas passage and the second gas passage during the exhaust process.

The reference numerals are explained below: 11. a first housing; 12. a second housing; 13. an air duct housing; 131. an air storage tank; 1310. a gas storage cavity; 132. a first connecting groove; 1320. a first gas passage; 133. a second communicating groove; 1330. a second gas passage; 134. an air duct; 135. a laser module mounting position; 136. an optical trap installation site; 137. mounting grooves; 2. a membrane; 21. a step portion; 31. a first magnetic member; 32. a second magnetic member; 4. a circuit board; 5. a fixed seat.

Detailed Description

While the present invention may be susceptible to embodiment in different forms, there is shown in the drawings and will herein be described in detail, specific embodiments thereof with the understanding that the present description is to be considered as an exemplification of the principles of the invention and is not intended to limit the invention to that as illustrated herein.

Thus, a feature indicated in this specification will serve to explain one of the features of an embodiment of the invention, and not to imply that every embodiment of the invention must have the described feature. Further, it should be noted that this specification describes many features. Although some features may be combined to show a possible system design, these features may also be used in other combinations not explicitly described. Thus, the combinations illustrated are not intended to be limiting unless otherwise specified.

In the embodiments shown in the drawings, directional references (such as upper, lower, left, right, front and rear) are used to explain the structure and movement of the various elements of the invention not absolutely, but relatively. These descriptions are appropriate when the elements are in the positions shown in the drawings. If the description of the positions of these elements changes, the indication of these directions changes accordingly.

The preferred embodiments of the present invention will be further described in detail with reference to the accompanying drawings.

Referring to fig. 1 to 5, a dust concentration sensor according to an embodiment of the present invention mainly includes a gas storage cavity 1310, a first gas channel 1320, and a second gas channel 1330. The air reservoir 1310 has at least a partially deformable portion that, when deformed, enables the volume of the air reservoir 1310 to expand or contract. The first gas channel 1320 has a first end communicating with the outside and a second end communicating with the gas storage chamber 1310, and the first gas channel 1320 is configured to: the through-flow cross-sectional area of the first end is smaller than the through-flow cross-sectional area of the second end. The second gas channel 1330 has a first end connected to the gas storage cavity 1310 and a second end connected to the outside, and the second gas channel 1330 is configured to: the cross-sectional flow area of the first end is smaller than the cross-sectional flow area of the second end. The flow rate of the first gas channel 1320 is greater than the flow rate of the second gas channel 1320 when the volume of the gas reservoir 1310 is expanded, and the flow rate of the first gas channel 1320 is less than the flow rate of the second gas channel 1330 when the volume of the gas reservoir 1310 is reduced.

When the deformable part of the air storage cavity 1310 is deformed to expand the volume of the air storage cavity 1310, the air pressure in the air storage cavity 1310 is smaller than the atmospheric pressure, the air storage cavity 1310 sucks air inwards, and since the through-flow cross-sectional area of the first end of the first air passage 1320 is smaller than the through-flow cross-sectional area of the second end, when the external air enters the air storage cavity from the first air passage 1320, the resistance is continuously reduced, and the air inlet speed is high. The cross-sectional area of the second end of the second gas channel 1330 is larger than the cross-sectional area of the first end, so that when the external gas enters the gas storage chamber 1310 from the second gas channel 1330, the resistance is increased continuously, and the gas inlet speed is slow. Therefore, the intake air amount of the first gas passage 1320 is larger than the intake air amount of the second gas passage 1330.

When the deformable part of the gas storage cavity 1310 is deformed inwards to reduce the volume of the gas storage cavity 1310, the air pressure in the gas storage cavity 1310 is larger than the atmospheric pressure, the gas storage cavity 1310 exhausts outwards, and the resistance is increased continuously and the exhaust speed is slow when the gas in the gas storage cavity 1310 is exhausted from the outside through the first gas channel 1320 because the flow cross-sectional area of the second end of the first gas channel 1320 is larger than that of the first end. And the cross-sectional area of the first end of the second gas channel 1330 is smaller than the cross-sectional area of the second end, so that the resistance is continuously reduced and the exhaust speed is high when the gas in the gas storage chamber 1310 is exhausted from the second gas channel 1330 to the outside. Therefore, the displacement of the first gas channel 1320 is smaller than the displacement of the second gas channel 1330 when the diaphragm is deformed concavely.

So, the deformation of the part that the gas storage chamber 1310 can produce deformation is repeated evagination constantly or indent, has just produced gas and has constantly got into the gas storage chamber from first gas passage 1320 to follow the gas storage chamber 1310 through second gas passage 1330 exhaust process, realized gaseous flow, thereby need not install the fan and can accomplish PM 2.5's detection, be favorable to the product miniaturization.

In this embodiment, the dust concentration sensor further includes a housing and a diaphragm 2. An air storage tank 131 is arranged in the shell. The diaphragm 2 is disposed in the housing, the diaphragm 2 and at least a portion of the air storage tank 131 enclose the air storage cavity 1310, and the diaphragm 2 can deform to expand or contract the volume of the air storage cavity 1310. In other embodiments, the air storage cavity 1310 may be formed by enclosing a flexible material, so that the air storage cavity 1310 can be deformed as a whole.

Wherein, a first gas channel 1320 and a second gas channel 1330 for communicating the gas storage cavity 1310 are further provided in the housing. The first gas passage 1320 has a cross-sectional flow area that gradually increases from the first end to the second end. The cross-sectional flow area of the second gas channel 1330 gradually increases from the first end to the second end. In other embodiments, the first gas passages 1320 may have a portion with a constant cross-sectional flow area and a remaining portion with a gradually increasing cross-sectional flow area. The second gas channel 1330 may also have a portion with a constant cross-sectional flow area and the remaining portion with a gradually increasing cross-sectional flow area.

Referring mainly to fig. 4 and 5, when the diaphragm 2 generates outward deformation to enlarge the volume of the gas storage cavity 1310, the air pressure in the gas storage cavity 1310 is less than the atmospheric pressure, the gas storage cavity 1310 inhales air inwards, because the end of the first air passage 1320 far away from the gas storage cavity 1310 is a gradually enlarged flaring structure to the end close to the gas storage cavity 1310, when the external air enters the gas storage cavity 1310 from the first air passage 1320, the resistance is continuously reduced, and the air inlet speed is fast. And the end of the second air passage 1330 far from the air storage cavity 1310 to the end close to the air storage cavity 1310 is in a gradually reduced necking structure, so that when the external air enters the air storage cavity 1310 from the second air passage 1330, the resistance is continuously increased, and the air inlet speed is slow. Therefore, the amount of intake air of the first gas passage 1320 is larger than that of the second gas passage 1330 at the time of the outward convex deformation of the diaphragm 2.

When the diaphragm 2 produces the volume that indent deformation made gas storage chamber 1310 and contracts, atmospheric pressure in the gas storage chamber 1310 was greater than atmospheric pressure, and gas storage chamber 1310 outwards exhausts, because first gas passage 1320 is close to the one end of gas storage chamber 1310 to the one end of keeping away from gas storage chamber 1310 is the throat structure that reduces gradually, and when gas in the gas storage chamber 1310 discharged the external world from first gas passage 1320, the resistance constantly increased, and exhaust speed is slow. And the second gas passage 1330 is close to the one end of the gas storage cavity 1310 to the one end far away from the gas storage cavity 1310 and is a gradually enlarged flaring structure, and when the gas in the gas storage cavity 1310 is discharged from the outside through the second gas passage 1330, the resistance is continuously reduced, and the gas inlet speed is high. Therefore, the displacement of the first gas channel 1320 is smaller than the displacement of the second gas channel 1330 when the diaphragm 2 is deformed concavely.

So, the deformation of diaphragm 2 repeated evagination or indent constantly, just produced gas and constantly got into gas storage chamber 1310 from first gas passage 1320 to from gas storage chamber 1310 through the process of second gas passage 1330 exhaust, realized the flow of casing internal gas, thereby need not install the great fan of volume and can accomplish PM 2.5's detection, be favorable to the product miniaturization.

It is worth mentioning that the fan also has the defect of high cost, and along with the increase of the using time of the fan, dust is gradually accumulated on the fan, so that the rotating speed of the fan is slowed, the gas flow speed in the sensor is slowed, and the measuring accuracy of the sensor is affected. Therefore, the sensor of the embodiment can reduce the manufacturing cost and ensure the measurement accuracy of the sensor.

Referring to fig. 1, in some embodiments, the housing includes a first housing 11, a second housing 12, and a duct housing 13, the first housing 11 and the second housing 12 are detachably mounted, and an internal space of the first housing 11 and the second housing 12 is used for mounting components inside the sensor, that is, the first housing 11 and the second housing 12 serve as a protective housing for the sensor. The duct housing 13 is detachably mounted in the second casing 12. In other embodiments, the air duct housing 13 may be integrally formed with the second housing 12.

Referring to fig. 2, the arrows in fig. 2 illustrate the flow of gas. An air duct 134 is formed on the air duct housing 13, an air inlet end of the air duct 134 is communicated with the outside as an air inlet of the sensor, and an air outlet end of the air duct 134 is communicated with one end of the first air channel 1320 far away from the air storage cavity 1310. The end of the second air channel 1330 away from the air storage cavity 1310 is connected to the outside as an air outlet of the sensor. The outside air entering from the air inlet end of the air duct 134 can sequentially pass through the air duct 134, the first air channel 1320, the air storage cavity 1310 and the second air channel 1330 and then be discharged to the outside again, so that the sensor can measure the PM2.5 concentration value of the outside air entering the sensor.

In other embodiments, an end of the first air channel 1320 far from the air storage cavity 1310 is connected to the outside as an air inlet of the sensor, an air inlet end of the air channel 134 is connected to an end of the second air channel 1330 far from the air storage cavity 1310, an air outlet end of the air channel 134 is connected to the outside as an air outlet of the sensor, and the outside air can be discharged to the outside again after passing through the first air channel 1320, the air storage cavity 1310, the second air channel 1330 and the air channel 134 in sequence. In addition, the air duct 134 does not need to be disposed on the air duct housing 13, the end of the first air passage 1320 far away from the air storage cavity 1310 is communicated with the outside as an air inlet of the sensor, the end of the second air passage 1330 far away from the air storage cavity 1310 is communicated with the outside as an air outlet of the sensor, and the outside air is directly discharged to the outside from the second air passage 1330 after entering the air storage cavity 1310 from the first air passage 1320.

Still be equipped with laser module installation position 135 and light trap installation position 136 on the wind channel casing 13, laser module installation position 135 is used for installing the laser module, and light trap installation position 136 is used for installing the light trap, and the function of laser module and light trap is the same with prior art, and it is no longer repeated here.

Referring to fig. 1 in conjunction with fig. 4 and 5, in some embodiments, the dust concentration sensor further includes a driving member connected to and driving the diaphragm 2 to deform in a convex or concave manner, so as to automatically expand or reduce the volume of the air storage chamber 1310.

In some embodiments, the driving member comprises a first magnetic member 31 and a second magnetic member 32. The first magnetic member 31 is connected to the diaphragm 2, and the second magnetic member 32 is fixed outside the air storage cavity 1310. When the first magnetic member 31 and the second magnetic member 32 are excited and the magnetism of the first magnetic member 31 is different from that of the second magnetic member 32, the two magnetic members are attracted to each other, and the diaphragm 2 protrudes outward to expand the volume of the air storage cavity 1310. Or, when the first magnetic member 31 and the second magnetic member 32 are both excited, and the first magnetic member 31 and the second magnetic member 32 have the same magnetism, the same poles repel each other, and the diaphragm 2 is recessed inwards to reduce the volume of the air storage cavity 1310. The first magnetic part 31 and the second magnetic part 32 are used for automatically driving the diaphragm 2 to deform, so that the gas flow in the sensor is automatically realized.

The diaphragm 2 may be made of rubber, and the first magnetic member 31 may be installed in a forming cavity for forming the diaphragm 2 before the injection molding of the diaphragm 2, so that the connection between the diaphragm 2 and the first magnetic member 31 is firmer. And first magnetic part 31 is installed in diaphragm 2, can reduce the volume, more is favorable to the miniaturization of product.

In some embodiments, the first magnetic member 31 is a permanent magnet, the magnetic pole is in the up-down direction, the second magnetic member 32 is a coil, the magnetic pole is in the up-down direction after being energized, when the coil passes a forward current, the magnetism generated by the coil is different from that of the permanent magnet, the diaphragm 2 protrudes outward to expand the volume of the air storage cavity 1310, when the coil passes a reverse current, the magnetism generated by the coil is the same as that of the permanent magnet, and the diaphragm 2 protrudes inward to reduce the volume of the air storage cavity 1310. It is understood that when the first magnetic member 31 is a permanent magnet, the first magnetic member 31 can be considered to be always in an excited state.

In some embodiments, the first magnetic member 31 is a permanent magnet and the second magnetic member 32 is a coil. The dust concentration sensor further comprises a circuit board 4, and the circuit board 4 is disposed in the housing and located outside the gas storage cavity 1310. The circuit board 4 comprises a substrate and a circuit attached to the substrate, and the coil is formed by circuit printing, namely the coil can be directly printed on the circuit board 4, so that the volume of the product is further reduced, and the product can be more miniaturized.

In some embodiments, the circuit board 4 is a multi-layer board structure, and each layer of board is printed with a coil to form a superimposed magnetic field, so that the magnetic force is increased by forming the superimposed magnetic field, the deformation amount of the membrane 2 is larger, and the flow amount of the air flow is increased.

In other embodiments, the membrane 2 has a convex shape and the membrane 2 has elasticity, for example, the membrane 2 may be made of metal elastic sheet. First magnetism part 31 is connected in diaphragm 2, second magnetism part 32 sets firmly outside the gas storage chamber 1310, all excite at first magnetism part 31 and second magnetism part 32, and the magnetism of first magnetism part 31 and second magnetism part 32 is the same, like poles repel each other, diaphragm 2 overcomes self elasticity and indent, make the volume of gas storage chamber 1310 reduce, when first magnetism part 31 and second magnetism part 32 all demagnetization, diaphragm 2 is evaginated under self elastic action, make the volume of gas storage chamber 1310 enlarge. Or, the first magnetic member 31 is connected to the diaphragm 2, the second magnetic member 32 is fixedly arranged in the air storage cavity 1310, the first magnetic member 31 and the second magnetic member 32 are both excited, and when the magnetism of the first magnetic member 31 is different from that of the second magnetic member 32, the opposite attraction is generated, the diaphragm 2 overcomes the elasticity of the diaphragm and is concave, so that the volume of the air storage cavity 1310 is reduced, and when the first magnetic member 31 and the second magnetic member 32 are both demagnetized, the diaphragm 2 protrudes outwards under the action of the elasticity of the diaphragm, so that the volume of the air storage cavity 1310 is enlarged.

In other embodiments, the diaphragm 2 has a concave deformation, and the diaphragm 2 has elasticity. First magnetism part 31 is connected in diaphragm 2, second magnetism part 32 sets firmly outside gas storage chamber 1310, all excite at first magnetism part 31 and second magnetism part 32, and when first magnetism part 31 and second magnetism part 32 magnetism was different, opposite attraction mutually, diaphragm 2 overcomes self elasticity and evagination, make the volume of gas storage chamber 1310 enlarge, when first magnetism part 31 and second magnetism part 32 all demagnetization, diaphragm 2 is the indent under self elastic action, make the volume of gas storage chamber 1310 reduce.

It should be noted that, when the diaphragm 2 is made of a metal elastic sheet, the first magnetic member 31 is not required to be provided, and when the second magnetic member 32 generates magnetism, the metal elastic sheet can be attracted to overcome the elasticity thereof to generate deformation.

Referring to fig. 1 to 3, in some embodiments, an installation groove 137 is further formed in the air duct housing 13, and the air storage groove 131 is concavely formed on a bottom surface of the installation groove 137. The dust concentration sensor further comprises a fixing seat 5, the fixing seat 5 clamps and fixes the diaphragm 2 in the mounting groove 137, and the diaphragm 2 and the air storage groove 131 enclose the air storage cavity 1310. Fixing base 5 presss from both sides and establishes and fixes diaphragm 2, makes gas storage chamber 1310 have better leakproofness to diaphragm 2 encloses whole mounting groove 137 and closes gas storage chamber 1310, and then can guarantee to breathe in or carminative volume when diaphragm 2 produces deformation.

In other embodiments, the membrane 2 may be disposed in the air reservoir 131, and the outer periphery of the membrane 2 is connected to the inner peripheral wall of the air reservoir 131, so that the membrane 2 and part of the air reservoir 131 enclose the air reservoir 1310.

In some embodiments, the inner peripheral wall of the mounting groove 137 is convexly provided with a plurality of clamping ribs, the outer peripheral wall of the fixing seat 5 is concavely provided with a plurality of clamping grooves, and the clamping ribs are clamped in the clamping grooves, so that the fixing seat 5 is fixed in the mounting groove 137.

In some embodiments, a first communicating groove 132 and a second communicating groove 133 are further disposed in the air duct housing 13, and the first communicating groove 132 and the second communicating groove 133 are concavely disposed on the bottom surface of the mounting groove 137. When the membrane 2 is clamped and fixed in the mounting groove 137, the membrane 2 and the first connecting groove 132 enclose a first gas channel 1320, and enclose a second gas channel 1330 with the second connecting groove 133. The membrane 2 encloses the first gas channel 1320 with all the first communicating grooves 132 and the second gas channel 1330 with all the second communicating grooves 133, and the first gas channel 1320 and the second gas channel 1330 have better sealing performance, so that the first gas channel 1320 has enough air inflow and the second gas channel 1330 has enough air exhaust. In other embodiments, the membrane 2 may also enclose the first gas channel 1320 with a portion of the first connecting groove 132 and enclose the second gas channel 1330 with a portion of the second connecting groove 133.

In some embodiments, the membrane 2 includes a plurality of steps 21, and the plurality of steps 21 are outwardly convex layer by layer or the plurality of steps 21 are inwardly concave layer by layer, increasing the amount of deformation of the membrane 2. And, the diaphragm 2 is bigger in the total height in the deformation direction, has improved the life of diaphragm 2 repeated deformation in-process.

While the present invention has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present invention may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.

Claims

1. A dust concentration sensor of an integrated PCB coil diaphragm pump is characterized by comprising:

an air reservoir having at least a partially deformable portion that deforms to expand or contract the volume of the air reservoir;

a first gas passage having a first end communicating with the outside and a second end communicating with the gas storage chamber, the first gas passage being configured to: the flow cross-sectional area of the first end is smaller than that of the second end;

a second gas passage having a first end communicating with the gas storage chamber and a second end communicating with the outside, the second gas passage being configured to: the flow cross-sectional area of the first end is smaller than that of the second end;

when the volume of the gas storage cavity is enlarged, the flow of the first gas channel is larger than that of the second gas channel, and when the volume of the gas storage cavity is reduced, the flow of the first gas channel is smaller than that of the second gas channel.

2. The dust concentration sensor of claim 1, further comprising a housing and a diaphragm;

an air storage groove is formed in the shell;

the diaphragm is arranged in the shell, the diaphragm and the air storage groove enclose the air storage cavity, and the diaphragm can deform so as to enlarge or reduce the volume of the air storage cavity.

3. The dust concentration sensor of claim 2, further comprising a driving member coupled to and driving the diaphragm to deform to expand or contract the volume of the gas storage chamber.

4. The dust concentration sensor of claim 3, wherein the driving member comprises a first magnetic member and a second magnetic member, the first magnetic member is connected to the diaphragm, and the second magnetic member is fixed outside the gas storage cavity;

when the first magnetic part and the second magnetic part are excited and the magnetism of the first magnetic part is different from that of the second magnetic part, the opposite attraction is realized, and the diaphragm protrudes outwards to expand the volume of the air storage cavity; or the like, or, alternatively,

when the first magnetic part and the second magnetic part are excited, and the first magnetic part and the second magnetic part have the same magnetism, the same poles repel each other, and the concave diaphragm enables the volume of the air storage cavity to be reduced.

5. The dust concentration sensor according to claim 4, wherein the first magnetic member is a permanent magnet, the second magnetic member is a coil, when the coil passes a forward current, the magnetic property generated by the coil is different from that of the permanent magnet, the opposite attraction is generated, the diaphragm protrudes outwards to enlarge the volume of the gas storage chamber, when the coil passes a reverse current, the magnetic property generated by the coil is the same as that of the permanent magnet, the like attraction repels, and the inward recess of the diaphragm reduces the volume of the gas storage chamber.

6. The dust concentration sensor according to claim 5, wherein the first magnetic member is a permanent magnet, and the second magnetic member is a coil;

the dust concentration sensor also comprises a circuit board, and the circuit board is arranged in the shell and is positioned outside the gas storage cavity;

the circuit board comprises a substrate and a circuit attached to the substrate, and the coil is formed by circuit printing.

7. The dust concentration sensor of claim 6, wherein the circuit board is of a multi-layer board structure, and each layer is printed with a coil to form a superimposed magnetic field.

8. The dust concentration sensor according to claim 2, wherein a mounting groove is further provided in the housing, and the air storage groove is recessed in a bottom surface of the mounting groove;

the dust concentration sensor further comprises a fixing seat, the fixing seat is used for clamping and fixing the diaphragm in the mounting groove, and the diaphragm and the gas storage groove are enclosed to form the gas storage cavity.

9. The dust concentration sensor according to claim 8, wherein a first communicating groove and a second communicating groove are further provided in the housing, and the first communicating groove and the second communicating groove are recessed in a bottom surface of the mounting groove;

when the diaphragm clamp is fixed in the mounting groove, the diaphragm and the first communicating groove enclose the first gas channel, and the second communicating groove encloses the second gas channel.

10. The dust concentration sensor according to claim 2, wherein a flow cross-sectional area of each of the first gas passage and the second gas passage from the first end to the second end is gradually enlarged.