CN210486919U

CN210486919U - Sensor with compact structure

Info

Publication number: CN210486919U
Application number: CN201921558112.3U
Authority: CN
Inventors: 吴斌; 陈登科; 陈怀博
Original assignee: Jinhua Hongchang Electrlcal Equipment Co ltd
Current assignee: Jinhua Hongchang Electrlcal Equipment Co ltd
Priority date: 2019-09-19
Filing date: 2019-09-19
Publication date: 2020-05-08
Anticipated expiration: 2029-09-19

Abstract

The utility model discloses a sensor with compact structure, which comprises an inner shell and an outer shell, wherein the inner shell comprises an upper shell and an air cover, the lower part of the upper shell is provided with a first diameter-expanding part, the upper part of the air cover is provided with a second diameter-expanding part, the second diameter-expanding part is sealed and connected with the first diameter-expanding part in a sealing way, the two parts are matched to form a pressure cavity, and a diaphragm assembly is positioned in the pressure cavity; the upper part of the upper shell is fixedly provided with a lead plate, a plurality of inserting pieces extend out from the end part of the lead plate along the horizontal direction, the side surface of the accommodating part is provided with a notch through which the inserting pieces penetrate, a baffle is arranged below the inserting pieces, and the outer shell is an integrally formed injection molding piece. The utility model discloses a sensor simple structure is compact, low in production cost, and the leakproofness is good, and the installation is dismantled conveniently.

Description

Sensor with compact structure

Technical Field

The utility model belongs to the technical field of the sensor, concretely relates to compact structure's sensor.

Background

The sensor is widely applied to household appliances, such as a water level sensor used in a washing machine, and is used for transmitting a sensed water level signal to a controller, the controller compares an actually measured water level signal with a set signal to obtain a deviation, and then sends an 'on' or 'off' instruction to a water supply electric valve according to the property of the deviation to ensure that the set water level is reached, and the working principle of the sensor is as follows: the pressure sensor is used for feeding air from an air inlet hole in the air cover, when the air pressure in the inner cavity of the air cover reaches a threshold value, the diaphragm is pushed to move upwards, so that the position of the magnetic core in the magnetic field of the induction coil is changed, and then a signal is transmitted to the integrated circuit board, so that the frequency change is achieved. The existing sensor is provided with a metal mounting plate, the mounting plate is provided with a positioning hole and is fixed on the washing machine in a screw mode, and the mounting and the maintenance both need disassembling tools and can not realize quick mounting and dismounting; the sensor has large volume, metal parts are directly exposed outside, the metal parts are easy to rust when the sensor is in a humid environment, the requirement on electroplating rust prevention on the surfaces of the metal parts is high, and the manufacturing cost is high; the whole leakproofness of sensor is not good enough, belongs to semi-open structure, and inside the insect ant can get into the sensor via the gap, bites inside diaphragm, leads to sensor gas leakage finally to lead to the inefficacy of sensor.

Disclosure of Invention

The utility model discloses to the problem of sensor installation dismantlement among the prior art inconvenience, the leakproofness is poor, manufacturing cost is high, the structure is compact enough, provide a compact structure's sensor.

The invention aims to be realized by the following technical scheme:

a sensor with a compact structure comprises an inner shell, a diaphragm assembly, a coil assembly and a magnetic core, and is characterized in that the inner shell comprises an upper shell and an air cover, wherein the lower part of the upper shell is provided with a first diameter-expanding part, the upper part of the air cover is provided with a second diameter-expanding part, the second diameter-expanding part is hermetically sleeved on the first diameter-expanding part, the first diameter-expanding part and the second diameter-expanding part are matched to form a pressure cavity, and the diaphragm assembly is positioned in the pressure cavity; one side of the second diameter expanding part extends outwards along the horizontal direction to form a pedestal, the lower part of the air cover is obliquely provided with a drainage tube, and the drainage tube and the pedestal are positioned on the same side; the inner shell is sleeved with an outer shell, the outer shell is provided with an assembly cantilever and a protective cover, and the assembly cantilever can be clamped in an electric appliance; the protective cover is provided with a connecting part connected with the air cover and an accommodating part used for accommodating the magnetic core and the coil assembly, the connecting part comprises a third diameter-expanding part matched with the second diameter-expanding part and a frame body matched with the pedestal, the upper end and the lower end of the frame body are provided with openings, the upper part of the upper shell is fixedly provided with a lead plate, a plurality of inserting pieces extend out from the end part of the lead plate along the horizontal direction, and the side surface of the accommodating part is provided with a notch for the inserting pieces to penetrate out; a baffle plate is arranged below the inserting sheet, the baffle plate is provided with a horizontal part and a vertical part, the vertical part covers the notch, and the horizontal part covers the opening at the upper end of the frame body; first clamping ridges are formed on the outer walls of the second expanding portion and the pedestal, each first clamping ridge is provided with a clamping inclined surface, clamping holes corresponding to the first clamping ridges one by one are formed in the third expanding portion and the outer wall of the frame body, and the first clamping ridges can be clamped in the clamping holes to realize clamping connection of the shell and the air cover; the shell is an integrally formed injection molding piece.

The overall sealing performance of the sensor can be effectively improved through the matching of the upper shell, the air cover and the shell; only the core components of the sensor are exposed outside, and the rest core components are sealed in the shell, so that the core components are prevented from being damaged, and the service life of the sensor is prolonged; the clamping edge with the clamping inclined plane is matched with the clamping hole, so that the shell and the air cover can be conveniently clamped and connected reliably; the arrangement of the assembling cantilever can realize the quick assembly and disassembly of the sensor; the shell adopts an integrally formed structure, so that the assembly is convenient, and the sealing performance and the installation reliability of the sensor can be effectively improved; compared with metal materials, the plastic material has lower cost, is more suitable for a humid environment, and cannot be corroded.

Preferably, the upper end face of the inserting piece is flush with the upper end face of the vertical portion, and the upper end face of the vertical portion is closely abutted to the upper groove wall of the groove opening. The arrangement can improve the sealing performance of the sensor.

Preferably, the lead plate and the baffle are integrally injection molded, and a blocking edge is arranged at the transition position of the lead plate and the baffle. The sealing performance of the sensor is further improved by the aid of the arrangement, and the blocking edge can shield an installation gap between the shell and the upper shell.

Preferably, the outer peripheral surface of the first diameter-expanding part is formed with a positioning rib, the outer peripheral surface of the second diameter-expanding part is formed with a positioning notch, the positioning rib corresponds to the positioning notch in position, and the positioning rib can be clamped in the positioning notch to limit the relative displacement of the upper shell and the air cap in the circumferential direction. The assembling precision of the sensor can be effectively improved by the aid of the arrangement.

Preferably, the outer peripheral surface of the first diameter-expanding portion is circumferentially provided with an annular positioning groove, the inner peripheral surface of the second diameter-expanding portion is circumferentially and uniformly provided with a plurality of second clamping ridges, and each second clamping ridge is provided with a clamping inclined surface. The second clamping edge is matched with the positioning groove to realize quick assembly and disassembly of the upper shell and the air cover.

Preferably, the third enlarged diameter portion has an outer diameter of 41 mm. On the basis of realizing the function of the sensor, the maximum outer diameter of the sensor is reduced to 41mm from 58.5mm, the integral structure of the sensor is reduced, and meanwhile, the pressure cavity is smaller, so that the detection sensitivity of the sensor is higher.

As preferred, the assembly cantilever is located the one side relative with the inserted sheet, and the assembly cantilever includes two mutual parallel arrangement's support arm, and the both sides of support arm are equipped with respectively to support the pressure arm, and the front end of support arm is equipped with the buckle that has the radian, and the place ahead of buckle is equipped with the dop, and the dop can block in the pilot hole of electrical apparatus, support pressure arm, buckle, dop and all have elasticity. The assembling cantilever and the inserting piece are arranged oppositely, so that the mounting space can be reasonably utilized, and the miniaturization of equipment is facilitated; the assembly cantilever adopts the structure, is simple and reliable, and enables the sensor to be quickly and conveniently mounted and dismounted.

Preferably, the clamping head comprises a front wall, clamping plates are arranged on two sides of the front wall, the clamping plates extend to the buckling plate from two sides of the front wall in an inclined mode, a clamping gap is formed between each clamping plate and the buckling plate, the distance between the two clamping plates is gradually increased from the front wall to the buckling plate, and positioning steps are arranged at the tail ends of the clamping plates. The positioning step is matched with the pinch plate, so that the mounting precision of the sensor and the connection reliability of the sensor and an electric appliance can be effectively improved.

Preferably, two side walls of the frame body extend vertically upwards to form two side wings, and the inserting piece is positioned in a space defined by the two side wings and the baffle plate. The above arrangement can not only realize the connection of the inserting sheet and the outside, but also effectively protect the inserting sheet.

Preferably, the diaphragm assembly comprises a support spring, a diaphragm and a support frame, the lower end of the support spring abuts against the air cap, the upper end of the support spring abuts against the lower end face of the diaphragm, the support is fixedly connected with the diaphragm, the magnetic core is in a hollow cylindrical shape, a connecting column for connecting the magnetic core is arranged at the upper end of the support, and the diaphragm is connected with the magnetic core through the support. The diaphragm assembly is convenient to assemble due to the adoption of the structure, the moving reliability of the magnetic core can be ensured, and the sensitivity of the sensor is ensured.

Compared with the prior art, the utility model discloses following beneficial effect has: the shell is integrally formed by injection molding, the sensor has a compact structure, is convenient to install, and has good sealing performance and low manufacturing cost; the shell, the air cover and the upper shell have simple and reasonable structures, and can effectively protect core components of the sensor by mutual matching; the shell and the air cover, and the upper shell and the air cover are connected in a clamping manner, so that the assembly is quick and convenient; the assembly cantilever replaces the original metal mounting plate, and the sensor can be mounted without screws, so that the sensor can be mounted and dismounted quickly; the sensor has the advantages of simple overall structure, smaller volume, high sensitivity, installation space saving and contribution to miniaturization of equipment.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of the present invention;

FIG. 3 is a schematic view of the internal structure of the present invention;

FIG. 4 is a schematic view of the structure of the middle housing of the present invention;

FIG. 5 is a schematic view of the structure of the middle air cap of the present invention;

FIG. 6 is a schematic view of the upper shell structure of the present invention;

the labels in the figure are: an upper case 10; a first diameter-expanding portion 11; an annular positioning groove 12; a positioning rib 13; an air cap 20; the second diameter-expanding portion 21; a second card edge 22; positioning the notch 23; a pedestal 24; a draft tube 25; a first card edge 26; a housing 30; assembling the cantilever 31; the accommodating portion 32; a third diameter-expanding portion 33; a frame body 34; a chucking hole 35; the notch 36; the side flaps 37; a support arm 311; the pressing arm 312; a pinch plate 313; a front wall 314; a card board 315; a positioning step 316; a membrane 41; a support spring 42; a support frame 43; a magnetic core 44; a lead plate 45; a pressure regulating spring 46; a plug screw 47; a pressure chamber 48; an insert 51; a baffle plate 52; a vertical portion 521; a horizontal portion 522; a ledge 523.

Detailed Description

The invention will be further described with reference to the embodiments shown in the drawings to which:

as shown in fig. 1-6, the present embodiment discloses a compact sensor, which includes an inner casing, a diaphragm assembly, a coil assembly, and a magnetic core 44, wherein the inner casing is formed by sealing and connecting the outer edges of an upper casing 10 located at the upper part and an air cap 20 located at the lower part, the lower part of the upper casing 10 has a first diameter-expanding portion 11, the upper part of the air cap 20 has a second diameter-expanding portion 21, the second diameter-expanding portion 21 is hermetically sleeved on the first diameter-expanding portion 11, and the two portions cooperate to form a pressure chamber 48; in this embodiment, the upper shell 10 and the air cap 20 are connected in a clamping manner, the outer circumferential surface of the first diameter-expanding portion 11 is circumferentially provided with an annular positioning groove 12, the inner circumferential surface of the second diameter-expanding portion 21 is circumferentially and uniformly formed with six second clamping ridges 22, the upper shell 10 and the air cap 20 can be quickly assembled and disassembled by matching the second clamping ridges 22 with the positioning grooves, and the second clamping ridges 22 have clamping inclined surfaces which are gradually inclined towards the central axis of the second diameter-expanding portion 21 along the clamping direction of the upper shell 10, so that the upper shell 10 is clamped, and the connection between the upper shell 10 and the air cap 20 is more stable and reliable; in order to limit the relative displacement of the upper shell 10 and the air cap 20 in the circumferential direction and ensure the installation precision, a positioning convex rib 13 is formed on the outer circumferential surface of the first diameter-expanding part 11, a positioning notch 23 is formed on the outer circumferential surface of the second diameter-expanding part 21, the positioning convex rib 13 corresponds to the positioning notch 23 in position, and the positioning convex rib 13 can be clamped in the positioning notch 23; one side of the second diameter-expanding part 21 extends outwards along the horizontal direction to form a pedestal 24, the lower part of the air cover 20 is obliquely provided with a drainage tube 25, the drainage tube 25 and the pedestal 24 are positioned at the same side, the drainage tube 25 is communicated with an air inlet hole in the air cover 20, when the sensor is applied to a washing machine, the drainage tube 25 is directly connected with an air guide tube for detecting the water level in the washing machine, air pressure is introduced into a pressure cavity 48 to control the water level, the drainage tube 25 is obliquely arranged and positioned at the same side with the pedestal 24, the structure of the whole sensor is more compact, and the installation space can be effectively utilized.

The inner shell is sleeved with an outer shell 30, the outer shell 30 is provided with an assembly cantilever 31 and a protective cover, and the assembly cantilever 31 can be clamped on an electric appliance; the protective cover is provided with a connecting part connected with the air cover 20 and an accommodating part 32 used for accommodating the magnetic core 44 and the coil assembly, the connecting part comprises a third diameter-expanding part 33 matched with the second diameter-expanding part 21 and a frame body 34 matched with the pedestal 24, the upper end and the lower end of the frame body 34 are provided with openings, the outer walls of the second diameter-expanding part 21 and the pedestal 24 are respectively provided with a first clamping ridge 26, the first clamping ridge 26 is provided with a clamping inclined surface, the outer walls of the third diameter-expanding part 33 and the frame body 34 are provided with clamping holes 35 which are inclined surface clamping one-to-one corresponding, the inclined surface clamping ridges can be clamped in the clamping holes 35 to realize clamping of the shell 30 on the air cover 20, and the shell 30 is integrally injection-molded.

The assembling cantilever 31 is arranged on one side opposite to the inserting piece 51, and the assembling cantilever 31 and the inserting piece 51 are arranged oppositely, so that the assembling space can be reasonably utilized, and the miniaturization of equipment is facilitated; the assembly cantilever 31 includes two support arms 311 that are parallel to each other, and the both sides of support arm 311 are equipped with respectively and support arm 312, and the front end of support arm 311 is equipped with buckle 313, and the place ahead of buckle 313 is equipped with the dop, and the dop can block in the pilot hole of electrical apparatus, support arm 312, buckle 313, the dop all has elasticity, and the dop includes a antetheca 314, and the both sides of antetheca 314 are equipped with cardboard 315, and cardboard 315 extends to buckle 313 by the both sides slope of antetheca 314 to and form between the buckle 313 and clamp the clearance, and the interval between two cardboard 315 is by antetheca 314 to buckle 313 grow gradually, and the end of cardboard 315 is equipped with location step 316. The assembling cantilever 31 adopts the structure, the structure is simple and reliable, the sensor can be quickly and conveniently assembled and disassembled, when the sensor is assembled, the clamping head is gradually pressed into the assembling hole of the inner wall of the electric appliance, the width of the front wall 314 of the clamping head is matched with the width of the assembling hole, in the process that the clamping head enters the assembling hole, the two clamping plates 315 move oppositely under the extrusion of the side wall of the assembling hole to adapt to the width of the assembling hole, after the whole clamping head enters the assembling hole, the two clamping plates 315 get rid of the extrusion of the side wall of the assembling hole and restore to the original position, the whole clamping head is limited in the assembling hole and cannot be separated, the buckling plate 313 has a certain radian, the inner wall of the electric appliance can be deformed and tightly attached to the inner wall of the electric appliance under the combined action of the inner wall of the electric appliance and the pressing arm 312, the inner wall of the electric appliance positioned at, and the installation accuracy and the connection reliability are guaranteed, and when the sensor needs to be disassembled, the sensor only needs to be rotated by 90 degrees, and the clamping head is taken out from the assembling hole, so that the sensor can be disassembled.

The diaphragm assembly is positioned in the pressure cavity 48 and comprises a support spring 42, a diaphragm 41 and a support frame 43, the lower end of the support spring 42 is abutted to the air cap 20, the upper end of the support spring is abutted to the lower end face of the diaphragm 41, the support frame is fixedly connected with the diaphragm 41, the magnetic core 44 is in a hollow cylindrical shape, the upper end of the support frame is provided with a connecting column for connecting the magnetic core 44, and the diaphragm 41 is connected with the magnetic core 44 through the support frame; the upper shell 10 is provided with a movable hole for moving the magnetic core 44, the magnetic core 44 moves along with the diaphragm 41, and the diaphragm assembly adopts the structure, so that the assembly is convenient, the moving reliability of the magnetic core 44 can be ensured, and the sensitivity of the sensor can be ensured; in addition, in the embodiment, the outer diameter of the third diameter-expanding part 33 is 41mm, on the basis of realizing the function of the sensor, the maximum outer diameter of the sensor is reduced from 58.5mm to 41mm, and the pressure cavity 48 is smaller while the overall structure of the sensor is reduced, so that the detection sensitivity of the sensor is higher; the coil assembly and the magnetic core 44 are both positioned in the cavity inside the accommodating part 32, the coil assembly comprises a winding groove, a coil and a lead plate 45, the winding groove is arranged around the movable hole, the lead plate 45 is fixedly arranged at the upper part of the upper shell 10, three inserting pieces 51 extend out from the end part of the lead plate 45 along the horizontal direction, a notch 36 for the inserting piece 51 to penetrate out is formed in the side surface of the accommodating part 32, and the three inserting pieces 51 are arranged in parallel and positioned on the same plane; a baffle plate 52 is arranged below the inserting sheet 51, the baffle plate 52 is provided with a horizontal part 522 and a vertical part 521, the vertical part 521 covers the notch 36, and the horizontal part 522 covers the opening at the upper end of the frame body 34; in order to improve the sealing performance of the sensor, the upper end surface of the insertion piece 51 is flush with the upper end surface of the vertical part 521, and the upper end surface of the vertical part 521 is closely abutted to the upper groove wall of the notch 36; the lead plate 45 and the baffle plate 52 are integrally injection-molded, a blocking edge 523 is arranged at the transition position of the lead plate 45 and the baffle plate 52, the sealing performance of the sensor is further improved, and the blocking edge 523 can block an installation gap between the shell 30 and the upper shell 10; the cavity of the accommodating part 32 is also provided with a pressure regulating spring 46 and a screw plug 47; two lateral walls of framework 34 are vertical upwards to extend, form two flanks 37, inserted sheet 51 is located the space that two flanks 37 and baffle 52 limit jointly, and above setting can not only realize being connected of inserted sheet 51 and outside, can also carry out effectual protection to inserted sheet 51. Through the cooperation of epitheca 10, gas lid 20, shell 30, can effectively improve the whole leakproofness of sensor, the core subassembly of sensor only inserted sheet 51 exposes outside, and all the other core subassemblies are all sealed in the casing to avoid the core subassembly to receive destruction, prolong the life of sensor.

The utility model discloses a compact structure's sensor, simple structure is compact, and small sensitivity is high, and the leakproofness is good, and the installation is dismantled conveniently, can effectively utilize installation space, helps equipment to realize the miniaturization, has reduced manufacturing cost when promoting the sensor quality.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A sensor with a compact structure comprises an inner shell, a diaphragm assembly, a coil assembly and a magnetic core (44), and is characterized in that the inner shell comprises an upper shell (10) and an air cover (20), the lower part of the upper shell (10) is provided with a first diameter-expanding part (11), the upper part of the air cover (20) is provided with a second diameter-expanding part (21), the second diameter-expanding part (21) is hermetically sleeved on the first diameter-expanding part (11) and is matched with the first diameter-expanding part to form a pressure cavity (48), and the diaphragm assembly is positioned in the pressure cavity (48); one side of the second diameter expanding part (21) extends outwards along the horizontal direction to form a pedestal (24), a drainage tube (25) is obliquely arranged at the lower part of the air cover (20), and the drainage tube (25) and the pedestal (24) are positioned at the same side; the inner shell is sleeved with an outer shell (30), the outer shell (30) is provided with an assembly cantilever (31) and a protective cover, and the assembly cantilever (31) can be clamped on an electric appliance; the protective cover is provided with a connecting part connected with the air cover (20) and an accommodating part (32) used for accommodating the magnetic core (44) and the coil assembly, the connecting part comprises a third diameter-expanding part (33) matched with the second diameter-expanding part (21) and a frame body (34) matched with the pedestal (24), the upper end and the lower end of the frame body (34) are provided with openings, the upper part of the upper shell (10) is fixedly provided with a lead plate (45), a plurality of inserting pieces (51) extend out from the end part of the lead plate (45) along the horizontal direction, and the side surface of the accommodating part (32) is provided with a notch (36) for the inserting pieces (51) to penetrate out; a baffle plate (52) is arranged below the inserting sheet (51), the baffle plate (52) is provided with a horizontal part (522) and a vertical part (521), the vertical part (521) covers the notch (36), and the horizontal part (522) covers an opening at the upper end of the frame body (34); first clamping ridges (26) are formed on the outer walls of the second diameter-expanding portion (21) and the pedestal (24), the first clamping ridges (26) are provided with clamping inclined surfaces, clamping holes (35) which correspond to the first clamping ridges (26) one by one are formed in the outer walls of the third diameter-expanding portion (33) and the frame body (34), and the first clamping ridges (26) can be clamped in the clamping holes (35) to clamp the shell (30) and the air cover (20); the shell (30) is an integrally formed injection molding piece.

2. A compact sensor according to claim 1, characterized in that the upper end surface of the insert (51) is flush with the upper end surface of the upright (521), the upper end surface of the upright (521) abutting closely against the upper groove wall of the slot (36).

3. A compact sensor according to claim 2, wherein the lead plate (45) is integrally injection molded with the baffle (52) and has a ledge (523) at the transition between the lead plate (45) and the baffle (52).

4. The sensor with the compact structure as claimed in claim 1, wherein the first diameter-expanding part (11) is provided with a ring-shaped positioning groove (12) along the circumferential direction on the outer circumferential surface, the second diameter-expanding part (21) is provided with a plurality of second clamping ridges (22) along the circumferential direction on the inner circumferential surface, and the second clamping ridges (22) are provided with clamping inclined surfaces.

5. A sensor with a compact structure according to claim 4, wherein the outer peripheral surface of the first diameter-expanding part (11) is formed with a positioning rib (13), the outer peripheral surface of the second diameter-expanding part (21) is formed with a positioning gap (23), the positioning rib (13) corresponds to the positioning gap (23), and the positioning rib (13) can be clamped in the positioning gap (23) to limit the relative displacement of the upper shell (10) and the air cap (20) in the circumferential direction.

6. A compact sensor according to claim 1, characterised in that the third enlarged diameter portion (33) has an outer diameter of 41 mm.

7. A sensor of a compact structure as claimed in any one of claims 1 to 6, wherein the assembly cantilever (31) is located at a side opposite to the insertion sheet (51), the assembly cantilever (31) comprises two support arms (311) disposed in parallel, two sides of the support arms (311) are respectively provided with a pressing arm (312), the front end of the support arms (311) is provided with a buckle plate (313) having a radian, a clamping head is disposed in front of the buckle plate (313), the clamping head can be clamped into a mounting hole of an electrical appliance, and the pressing arm (312), the buckle plate (313) and the clamping head are all elastic.

8. A compact sensor according to claim 7, wherein the chuck comprises a front wall (314), clamping plates (315) are arranged on two sides of the front wall (314), the clamping plates (315) extend from two sides of the front wall (314) to the buckling plate (313) in an inclined manner and form clamping gaps with the buckling plate (313), the distance between the two clamping plates (315) is gradually increased from the front wall (314) to the buckling plate (313), and the tail ends of the clamping plates (315) are provided with positioning steps (316).

9. A compact sensor as claimed in any one of claims 1 to 6, wherein two side walls of the frame (34) extend vertically upwards to form two side wings (37), and the insertion sheet (51) is located in a space defined by the two side wings (37) and the baffle (52).

10. A sensor with a compact structure according to claim 9, wherein the diaphragm assembly comprises a support spring (42), a diaphragm (41), and a support frame (43), the support spring (42) has a lower end abutting against the air cap (20) and an upper end abutting against a lower end face of the diaphragm (41), the support frame is fixedly connected with the diaphragm (41), the magnetic core (44) has a hollow cylindrical shape, the upper end of the support frame is provided with a connection column for connecting the magnetic core (44), and the diaphragm (41) is connected with the magnetic core (44) through the support frame.