Pressure sensor
By employing a snap-fit structure and a closed bottom design in the pressure sensor, the problems of complex assembly and foreign object intrusion in traditional pressure sensors are solved, achieving the effects of simplified operation and improved accuracy.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-07
- Publication Date
- 2026-03-31
AI Technical Summary
Traditional pressure sensors are complex to assemble and operate, pose a risk of foreign object intrusion, affect sensor accuracy and stability, and metal parts may cause measurement errors.
A pressure sensing component is sandwiched between the first and second air caps, and assembly is achieved using a snap-fit structure. The sealed bottom structure prevents foreign objects from entering, while simplifying the dispensing process for the magnetic core assembly.
It simplifies assembly operations, prevents foreign object intrusion, improves sensor accuracy and stability, and reduces the impact of the manufacturing process on product performance.
Smart Images
Figure CN224066257U_ABST
Abstract
Description
Technical Field
[0001] This application relates to a sensor, and more particularly to a pressure sensor for detecting operating parameters of household appliances. Background Technology
[0002] As home appliances evolve towards higher performance and greater precision, pressure sensors, as a core component, are widely used in appliances such as washing machines. In traditional pressure sensors, the gas cap, housing, and pressure sensing element typically need to be installed individually, making the installation process rather cumbersome.
[0003] Furthermore, traditional pressure sensors use a snap-fit mechanism to join components such as the gas cap. However, the injection molding process used to form this snap-fit structure requires a corresponding mold core, which needs to be removed after injection molding. Therefore, traditional pressure sensors have a through-hole 23 at the bottom (see...). Figure 6 This design allows the mold core used to form the snap-fit structure to be removed. However, this design makes it easy for external foreign objects (such as dust, ants, etc.) to enter the sensor through the bottom through-hole, thus affecting the normal operation of the sensor.
[0004] In existing technologies, some designs address this issue through press-fit manufacturing. For example, some products use additional metal parts to press-fit the upper and lower housings, tightly connecting the gas cap and the sensor body, eliminating the need for openings and preventing foreign objects from entering. However, on the one hand, the metal parts require precise alignment and positioning to ensure no deviation occurs during assembly, increasing the precision requirements. Furthermore, the press-fitting of the metal parts requires additional tools, leading to increased process and time costs during assembly. On the other hand, the metal parts can interfere with the sensor's magnetic field, affecting its accuracy and stability. Especially for some high-sensitivity pressure sensors, the presence of metal parts can cause measurement errors, and in severe cases, may completely prevent normal operation.
[0005] Furthermore, existing technologies typically use adhesives or mechanical connections to fix the various components of the magnetic core assembly of pressure sensors. However, the fastening operations of existing structures are complex, affecting assembly efficiency and fastening reliability.
[0006] Furthermore, in existing technologies, the connection between the magnetic core assembly and the pressure sensing component is usually achieved through fasteners, which makes the installation operation cumbersome and can easily affect the pressure sensing characteristics.
[0007] Therefore, traditional pressure sensors suffer from problems such as complex assembly operations, the risk of foreign object intrusion, and issues affecting sensor accuracy. Utility Model Content
[0008] The first aspect of this utility model provides a pressure sensor, which includes: a first air cover and a second air cover, and a pressure sensing component. The pressure sensing component is sandwiched between the first air cover and the second air cover. The chamber between the first air cover and the second air cover is divided into an upper chamber and a lower chamber by the pressure sensing component. The second air cover has a peripheral wall, and a hook is provided on the inner side of the peripheral wall. The outer side of the first air cover has a mating and engaging structure that engages with the hook of the second air cover. The bottom of the second air cover has a communicating channel, and the bottom of the second air cover is a fully enclosed structure except for the communicating channel.
[0009] According to the pressure sensor of the first aspect, the pressure sensing component is sandwiched between the first and second air covers, and the first and second air covers form a mutually engaging structure. Therefore, simply pressing the first air cover into the second air cover allows for the simultaneous assembly of the first air cover, the second air cover, and the pressure sensing component, thus simplifying the assembly operation. Furthermore, the bottom surface of the second air cover is a closed structure, eliminating the risk of foreign object intrusion. In addition, since no additional metal parts are required, any impact on the sensor's accuracy is avoided.
[0010] In the first aspect described above, preferably, a step is formed on the inner sidewall of the second air cover, the pressure sensing component is placed on the upper surface of the step, and a flange is formed at the inner periphery of the step, which abuts against the diaphragm of the pressure sensing component from below, thereby preventing the diaphragm from collapsing.
[0011] In the first aspect described above, preferably, the flange has recesses formed along the circumferential direction at positions corresponding to the plurality of hooks, thereby facilitating the removal of the mold core through the recesses, without having to form a through hole for removing the mold core on the bottom surface of the second air cover.
[0012] In the first aspect described above, preferably, the hooks and notches are evenly spaced along the periphery, thereby ensuring a secure engagement between the first and second air caps and stable support for the diaphragm.
[0013] In the first aspect described above, preferably, the hook has an annular hook edge, which is continuously constructed along the circumferential direction, thereby achieving a more secure engagement between the first air cover and the second air cover.
[0014] In the first aspect described above, preferably, the lower side of the hook of the second air cover forms a engaging surface that engages with the first air cover, and the side of the hook of the second air cover forms a bevel, thereby making the assembly process of engaging the first air cover and the second air cover easier.
[0015] In the first aspect described above, preferably, the outer periphery of the pressure sensing component is provided with a closed edge extending along the circumferential direction of the pressure sensing component, and the first air cap and the second air cap are sealed together by the closed edge located between them, thereby achieving a good seal between the first air cap and the second air cap.
[0016] In the first aspect described above, preferably, the pressure sensor further includes a magnetic core assembly and a coil. The magnetic core assembly comprises: a magnetic core seat having a supporting disc and an intermediate sleeve extending axially from the supporting disc, the intermediate sleeve having a receiving portion at its center, the intermediate sleeve having a sleeve end at one end away from the supporting disc, and the intermediate sleeve having a recessed portion on its outer side wall near the sleeve end; a magnetic core cap having a lower section on its lower side, the lower section being inserted into the receiving portion, the magnetic core cap having an upwardly open central hole at its center, the inner peripheral wall of the central hole having an axially extending glue flow groove, the glue flow groove having a radial opening, the central hole communicating with the outer side of the magnetic core cap through the radial opening; and a magnetic core sleeved on the outer side of the magnetic core cap and the magnetic core seat; a radial gap existing between the lower section and the receiving portion, an axial gap existing between the sleeve end and the magnetic core cap, and a radial gap existing between the recessed portion and the magnetic core. Here, the dispensing process can be performed quickly and easily during assembly, ensuring the accuracy of the dispensing position, achieving a firm connection between the various components of the magnetic core assembly, and the amount of adhesive used can be adjusted within a wide range to adapt to adhesives with different properties.
[0017] In the first aspect described above, preferably, the magnetic core base further comprises a connecting sleeve; the pressure sensing component has a centrally located support member with an upwardly opening groove, and the support member is elastic; the connecting sleeve has a radially outwardly protruding shoulder at its lower end, and the connecting sleeve, together with the shoulder, is fitted into the groove in a form-fitting manner, with the support disc supported on the support member. Here, a stable connection can be achieved throughout the installation process without the use of additional fixing measures, relying solely on the elasticity of the pressure sensing component itself, effectively reducing the impact of the manufacturing process on product performance.
[0018] In the first aspect described above, preferably, a protrusion is provided in the center of the groove, and the protrusion is inserted into the centering hole at the bottom center of the shoulder, thereby enabling accurate alignment of the magnetic core seat relative to the pressure sensing component. Attached Figure Description
[0019] Figure 1 A perspective view of the pressure sensor according to this utility model;
[0020] Figure 2 for Figure 1 A longitudinal sectional view of the pressure sensor in the middle;
[0021] Figure 3 for Figure 2 A partially enlarged schematic diagram of the cross-sectional view shown;
[0022] Figure 4 A perspective view showing the internal structure of the second gas cover of the pressure sensor of this utility model;
[0023] Figure 5 This is a top view of the second air cover of the pressure sensor according to the present invention, which shows the internal structure of the second air cover;
[0024] Figure 6 A partial three-dimensional view of a pressure sensor of the prior art, viewed from below the side;
[0025] Figure 7 Perspective, cross-sectional, and plan views of various components of the magnetic core assembly according to the present invention are shown;
[0026] Figure 8 Cross-sectional views and partially enlarged cross-sectional views of the magnetic core assembly and pressure sensing component according to the present invention are shown. Detailed Implementation
[0027] Figure 1 A perspective view of a pressure sensor according to the present invention is shown. Figure 1 As shown, the pressure sensor 1 includes a housing 2 and a can-shaped cover 3 fitted onto the housing 2. A connecting structure 31 is provided on the peripheral side of the can-shaped cover 3, by means of which the pressure sensor 1 is fixed, for example, to a washing machine (not shown). A signal connector 32 is also provided on the peripheral side of the can-shaped cover 3, which is used to transmit the signal generated by the sensor to the control device (not shown) of the washing machine. A communicating channel 41 is provided at the bottom of the housing 2, through which the liquid to be tested in the washing machine communicates with the interior of the housing 2.
[0028] Figure 2 It shows Figure 1 A longitudinal sectional view of pressure sensor 1 in the image. Figure 2As shown, the housing 2 of the pressure sensor 1 consists of an upper first gas cover 5 and a lower second gas cover 4. In the assembled state, a chamber is formed between the first gas cover 5 and the second gas cover 4, and a pressure sensing component 6 is installed within the chamber. The pressure sensing component 6 is arranged between the first gas cover 5 and the second gas cover 4. A closed edge 61 extending along the circumferential direction of the pressure sensing component 6 is provided on its outer periphery. In the installed state, this closed edge 61 seals and isolates the aforementioned chamber from the surrounding environment of the housing 2. Furthermore, this closed edge 61 divides the chamber between the first gas cover 5 and the second gas cover 4 into an upper chamber 21 and a lower chamber 22.
[0029] The first gas cover 5 is generally bowl-shaped, and the bowl-shaped first gas cover 5 has an upwardly extending sleeve 51. The second gas cover 4 is also generally bowl-shaped, and the bottom 42 of the bowl-shaped second gas cover 4 is constructed with a fluid channel 43 that is fluidly connected to the communicating channel 41. The first gas cover 5 and the second gas cover 4 are sealed together by the closed edge 61 of the pressure sensing element 6 located between them.
[0030] The first air cover 5 has an opening (not shown) that allows the upper chamber 21 to communicate with the atmospheric environment. The lower chamber 22 is connected to the washing machine drum (not shown) via a connecting channel 41. When the liquid level in the washing machine drum changes, the air pressure in the lower chamber 22 also changes, and the pressure difference between the upper chamber 21 and the lower chamber 22 causes the pressure sensing component 6 to deform.
[0031] According to an embodiment of the present invention, the pressure sensing component 6 has a carrier 62, a diaphragm 63 disposed around the carrier 62, and a closed edge 61. The carrier 62 has a central disc 66. The diaphragm 63 extends outward from the disc edge 65 of the central disc 66 of the carrier 62, forming an arched portion 64. The pressure sensing component 6 also includes the aforementioned closed edge 61 extending around the diaphragm 63, the closed edge 61 being sandwiched between the first gas cap 5 and the second gas cap 4, thereby sealingly separating the upper chamber 21 and the lower chamber 22. The central disc 66 of the carrier 62 and the closed edge 61 compress the diaphragm 63, causing the diaphragm 63 to arch upward between the disc edge 65 of the carrier 62 and the inner side of the closed edge 61, forming the arched portion 64. In a preferred embodiment, the pressure sensing component 6 is integrally constructed.
[0032] The pressure sensor 1 also includes a magnetic core assembly 7 and a coil 8, which together form a variable inductance sensor. The magnetic core assembly 7 has a magnetic core base 71, a magnetic core cap 72, and a magnetic core 73, which is made of a ferromagnetic material. The magnetic core assembly 7 is mounted inside the housing 2 and can move relative to the housing 2 as the pressure sensing component 6 deforms. In one embodiment, the coil 8 is coaxially arranged with the housing 2. When the magnetic core assembly 7 moves relative to the housing 2, the magnetic core 73 of the magnetic core assembly 7 moves in and out of the space enclosed by the coil 8, causing a change in the inductance of the coil 8. In one embodiment of this application, the coil 8 is wound around the outside of the sleeve 51 of the first air cover 5.
[0033] The magnetic core assembly 7 is supported above the support member 62 of the pressure sensing component 6. As the pressure sensing component 6 deforms, the magnetic core assembly 7 moves relative to the housing 2, forming a variable inductance sensor with the coil 8 wound around the sleeve 51 of the first air cover 5.
[0034] During operation, if the liquid level rises, the air pressure in the lower chamber 22 gradually increases, causing the pressure sensing component 6 to experience upward pressure. This causes the diaphragm 63 to move upward, pulling the magnetic core assembly 7 upward. As the magnetic core assembly 7 rises, the first spring 9 is compressed. As the liquid level drops, the air pressure in the lower chamber 22 decreases, the first spring 9 recovers, and the magnetic core assembly 7 returns to its initial position.
[0035] like Figure 3 As shown, the second air cover 4 has a two-step structure, comprising a step 44 near the first air cover 5 and a second step 45 spaced apart from the step 44 and extending radially inward away from the first air cover 5. The upper surface of the step 44 forms an abutment surface 46 for placing the closed edge 61 of the pressure sensing component 6. In a preferred embodiment, a flange 47 is formed at the inner periphery of the step 44, protruding substantially upward along the axial direction A, which, in the installed state, is located below the diaphragm 63 of the pressure sensing component 6. The flange 47 serves to provide support for the diaphragm 63 of the pressure sensing component 6 to prevent the arched portion of the diaphragm 63 from collapsing when the pressure in the lower chamber 22 is too low. In an alternative embodiment, a pressure sensing component 6 with higher rigidity can also be provided, in which the diaphragm 63 of such a high-rigidity pressure sensing component 6 can maintain its arched state in the installed state, thereby eliminating the need for the flange 47 at the inner periphery of the step 44. It is possible to select materials that meet this high stiffness requirement from known materials, such as rubber with sufficient stiffness.
[0036] In a preferred embodiment of the present invention, the longitudinal sections of the abutment surface 46 of the step 44 and the closed edge 61 of the pressure sensing component 6 are formed in a wavy or sawtooth shape that matches each other, thereby achieving a better sealing effect by utilizing the labyrinthine structure.
[0037] like Figures 3 to 5 As shown, in a preferred embodiment of the present invention, the second air cover 4 has a peripheral wall 48, which extends substantially along the axial direction A from the outer periphery of the step 44 towards... Figure 2 Extending upwards from the center. In the installed state, the first air cover 5 is housed inside the peripheral wall 48. The peripheral wall 48 has a plurality of hooks 49 on its inner side at a position along the axial direction A away from the step 44. These hooks 49 are spaced apart, preferably evenly spaced, along the circumferential direction. The longitudinal section of each hook 49 is trapezoidal, with its lower side forming an engaging surface for engaging the first air cover 5. The outer periphery of the first air cover 5 has a mating edge 52 extending downwards along the axial direction A, which is used to press against the closed edge 61 of the pressure sensing component 6.
[0038] During installation, the closed edge 61 of the pressure sensing component 6 is first placed on the abutment surface 46 of the step 44 of the second air cover 4. If a flange 47 is provided, the closed edge 61 of the pressure sensing component 6 is placed between the flange 47 and the peripheral wall 48 of the second air cover 4. Then, the first air cover 5 is inserted downward along the axial direction A into the inner side of the peripheral wall 48 of the second air cover 4. When the mating edge 52 of the first air cover 5 contacts the inclined surface of the hook 49 of the second air cover 4, as the first air cover 5 continues to move downward, the mating edge 52 of the first air cover 5 slides on the inclined surface of the hook 49 of the second air cover 4, and the first air cover 5 and the second air cover 4 undergo elastic deformation until the first air cover 5 completely passes over the hook 49 of the second air cover 4. At this point, the top surface 53 of the mating edge 52 of the first air cover 5 engages below the engaging surface of the hook 49 of the second air cover 4, and the closed edge 61 of the pressure sensing component 6 is clamped between the mating edge 52 of the first air cover 5 and the abutting surface 46 of the step 44 of the second air cover 4. Therefore, the installation process of the first air cover 5 simultaneously achieves the relative fixation of the first air cover 5 and the second air cover 4 and the clamping of the pressure sensing component 6, simplifying the operation.
[0039] In an alternative embodiment, the cross-section of the hook can also be triangular, with the lower side of the triangle forming an engaging surface for the first air cover 5. In an alternative embodiment, the hook 49 can also be constructed continuously along the periphery of the second air cover 4, thereby forming a complete annular hook edge on the inner side of the peripheral wall 48 of the second air cover 4. In an alternative or additional embodiment, a mating engaging structure is formed on the peripheral side of the first air cover 5 to engage with the hook 49 of the second air cover 4.
[0040] like Figure 4 and Figure 5As shown, in a preferred embodiment, along the peripheral direction, a notch 40 corresponding to a plurality of hooks 49 is constructed at the flange 47 at the inner peripheral edge of the step 44. In other words, within the peripheral angle range where the hooks 49 are constructed, the flange 47 is correspondingly constructed with a notch 40. When the second air cover 4 is injection molded, a corresponding mold core (not shown) needs to be provided below each hook 49 so that the mold core can form the engaging surface of the hook 49. During injection molding, the mold core is placed on the step 44, and the mold core is removed after injection molding is completed. In the prior art, a through hole 23 is provided on the bottom surface of the second air cover for removing the mold core (see Figure 6 In contrast, in one embodiment of this utility model, since a notch 40 corresponding to multiple hooks 49 is constructed at the flange 47 at the inner periphery of the step 44, the mold core can move radially inward through the corresponding notch 40, thereby smoothly removing the mold core. Therefore, it is unnecessary to provide a through hole or core-pulling hole for axially removing the mold core on the step 44 of the second air cover 4, thus the bottom of the second air cover 4 is a closed structure except for the connecting hole in the installed state (e.g., Figure 1 (As shown). This prevents foreign objects, such as dust or ants, from entering the pressure sensor and affecting its normal operation.
[0041] In an alternative embodiment, no recess 40 corresponding to the plurality of hooks 49 is constructed at the flange 47 at the inner periphery of the step 44. During injection molding, the engaging surfaces of the hooks 49 are formed, for example, by using a mold core with high rigidity, thereby allowing the use of a sufficiently small mold core. Therefore, even without the recess 40 at the flange 47, the mold core can be withdrawn and removed from the engaging surfaces of the hooks 49. In an alternative embodiment, the second air cover 4 is constructed using additive manufacturing (e.g., 3D printing) instead of injection molding, thus eliminating the need to consider the extraction method of the mold core. In both technical solutions described herein, the bottom of the second air cover 4 is a fully enclosed structure except for the connecting holes in the installed state.
[0042] In an alternative embodiment, the diaphragm 63 of the pressure sensing component 6, which has higher stiffness, is able to maintain an arched state, thus eliminating the need for a flange 47 at the inner periphery of the step 44. In this case, since there is no obstruction from the flange 47, the mold core for the engaging surface of the hook 49 can move smoothly radially inward, thus eliminating the need for a through hole on the step 44 of the second air cover 4 for axially removing the mold core. Consequently, the bottom of the second air cover 4 is a fully enclosed structure in the installed state, except for the connecting hole.
[0043] In alternative or additional embodiments of this utility model, a hook can also be provided on the outer side of the peripheral wall 48 of the second air cover 4, and a matching engaging component is provided at a corresponding position on the inner side of the can-shaped cover 3, so that the can-shaped cover 3 can be engaged with the second air cover 4. This hook structure on the outer side is similar to the hook structure on the inner side of the peripheral wall 48 of the second air cover 4, and therefore will not be described in detail.
[0044] like Figure 2 and Figure 7 As shown, in a preferred embodiment of this invention, the magnetic core assembly 7 includes a magnetic core seat 71, a magnetic core cap 72, and a magnetic core 73. The magnetic core cap 72 is a multi-stage cylindrical shape, with a lower section 721 on its lower side. The magnetic core cap 72 has an upwardly opening central hole 722 at its center. One or more glue flow channels 723 are formed on the inner peripheral wall of the central hole 722. The glue flow channels 723 extend along the axial direction A to a blocking portion 725 within the lower section 721. Each glue flow channel 723 has a radial opening 724, through which the central hole 722 communicates with the outer side of the magnetic core cap 72.
[0045] The core holder 71 has a coaxially constructed intermediate sleeve 711, a support disc 712, and a connecting sleeve 713, with the support disc 712 positioned between the intermediate sleeve 711 and the connecting sleeve 713. The intermediate sleeve 711 has a centrally located receiving portion 717 into which the lower portion 721 of the core cap 72 can be inserted. The intermediate sleeve 711 has a sleeve end 716 extending axially away from the support disc 712. An axial gap exists between the sleeve end 716 and the core cap 72. Near the sleeve end 716, a recessed portion 715 is constructed on the outer wall of the intermediate sleeve 711, below which is the main sleeve portion 718 of the intermediate sleeve 711. The outer diameter of the recessed portion 715 is smaller than the outer diameter of the main sleeve portion 718 and the inner diameter of the cylindrical core 73. The connecting sleeve 713 is a cylindrical member extending from the support disc 712 to the opposite side of the intermediate sleeve 711, and has a shoulder 714 that protrudes radially outward from the lower end of the cylindrical portion of the connecting sleeve 713. The support disc 712 is flat and disc-shaped. In the installed state, the lower surface of the support disc 712 contacts the upper surface of the central disc 66 of the pressure sensing component 6 and is supported on the central disc 66.
[0046] In the assembled state, the lower portion 721 of the core cap 72 of the core assembly 7 is inserted into the receiving portion 717 of the core seat 71, and the core 73 is sleeved on the outside of the core cap 72 and the core seat 71. In a preferred embodiment, the core 73 is fixedly connected to the core cap 72 and the core seat 71 by an interference fit. The outer diameter of the lower portion 721 of the core cap 72 is smaller than the inner diameter of the receiving portion 717 of the core seat 71, thereby forming a glue storage gap between the lower portion 721 of the core cap 72 and the receiving portion 717 of the core seat 71.
[0047] When applying adhesive in the assembled state, the adhesive is poured into the central hole 722 of the core cap 72. The adhesive flows downward through the adhesive flow channel 723 to the blocking part 725, and then flows outward through the radial opening 724 to the adhesive storage gap between the lower section 721 of the core cap 72 and the receiving part 717 of the core seat 71. Additionally, a portion of the adhesive bypasses the sleeve end 716 of the core seat 71 and reaches the gap between the recessed part 715 and the core 73. After the adhesive solidifies, a firm bond is achieved between the core seat 71, the core cap 72, and the core 73.
[0048] The slotted design and dimensional matching of the magnetic core assembly enable simple and quick dispensing during assembly, ensuring the accuracy of the dispensing position and allowing for a wide range of adhesive dosage adjustment to accommodate adhesives with different properties.
[0049] like Figure 8 As shown, in a preferred embodiment of this invention, the support member 62 of the pressure sensing component 6 has a groove 67 in its center and a protrusion 68 in the center of the groove 67. In the installed state, the connecting sleeve 713 of the magnetic core seat 71, together with the shoulder 714, is installed in the groove 67 of the support member 62 of the pressure sensing component 6, and the protrusion 68 of the support member 62 of the pressure sensing component 6 is inserted into the centering hole 719 at the bottom center of the shoulder 714 to achieve centering and positioning of the magnetic core seat 71 relative to the pressure sensing component 6. In alternative or additional technical solutions, the magnetic core seat 71 is designed with a fastening buckle (not shown) for engaging with the pressure sensing component 6.
[0050] During installation, simply pull open the groove 67 of the pressure sensing component 6 appropriately, and then insert the connecting sleeve 713 of the magnetic core seat 71 along with the shoulder 714 into the groove 67. Then release the pressure sensing component 6, and rely on the elastic restoring force of the pressure sensing component 6 itself to firmly wrap the connecting sleeve 713 of the magnetic core seat.
[0051] This mating structure not only ensures a tight fit between the pressure sensing component 6 and the bottom plane of the magnetic core base 71, improving the magnetic core's response speed to the deformation of the pressure sensing component 6, but also simplifies the installation process. The entire installation process requires no additional fixing measures; a stable connection is achieved solely through the elasticity of the pressure sensing component 6 itself, effectively reducing the impact of the manufacturing process on product performance.
[0052] Furthermore, the above description uses the application to a washing machine as an example, but the pressure sensor of this invention can also be used in other household appliances that require pressure sensing.
[0053] Although the present invention has been described with reference to one or more exemplary embodiments, those skilled in the art will understand that the present invention is not limited to the specific structures and components described herein, and that various modifications, variations, and alterations will be understood from the foregoing description without departing from the spirit and scope of the present invention as defined by the appended claims. The present invention is not limited to the shown order of steps, as some steps may be performed in a different order and / or simultaneously with other steps. Therefore, the present invention is not limited to the disclosed specific embodiments (one or more), but will include all embodiments falling within the scope of the appended claims.
Claims
1. A pressure sensor, characterized by The pressure sensor comprises: A first air cover (5) and a second air cover (4) and a pressure sensing component (6) sandwiched between the first air cover (5) and the second air cover (4), the chamber between the first air cover (5) and the second air cover (4) is divided into an upper chamber (21) and a lower chamber (22) by the pressure sensing component (6), The second air cover (4) has a peripheral wall (48), a clamping hook (49) is arranged on the inner side of the peripheral wall (48), The outer side of the first air cover (5) is formed with a matching clamping structure matched with the clamping hook (49) of the second air cover (4), The bottom of the second air cover (4) is provided with a communication channel (41), and the bottom of the second air cover (4) is a full-closed structure except the communication channel (41).
2. The pressure sensor of claim 1, wherein, A step (44) is formed on the inner side wall of the second air cover (4), the pressure sensing component (6) is placed on the upper surface of the step (44), and a flange (47) is formed at the inner periphery of the step (44), which abuts against the diaphragm of the pressure sensing component (6) from below.
3. The pressure sensor of claim 2, wherein, The flange (47) is respectively provided with recesses (40) at positions corresponding to the plurality of clamping hooks (49) along the peripheral direction.
4. The pressure sensor of claim 3, wherein, The clamping hook (49) and the recess (40) are respectively and uniformly spaced along the peripheral direction.
5. The pressure sensor according to any one of claims 1 to 4, characterized in that, The clamping hook (49) has an annular clamping hook edge which is continuously configured along the peripheral direction.
6. The pressure sensor according to any one of claims 1 to 4, characterized in that The lower side of the clamping hook (49) of the second air cover (4) forms a clamping surface matched with the first air cover (5), and the side surface of the clamping hook (49) of the second air cover (4) forms an inclined surface.
7. The pressure sensor according to any one of claims 1 to 4, characterized in that The outer periphery of the pressure sensing component (6) is provided with a closed edge (61) extending along the circumferential direction of the pressure sensing component (6), and the first air cover (5) and the second air cover (4) are sealingly combined by the closed edge (61) therebetween.
8. The pressure sensor of any one of claims 1 to 4, wherein, The pressure sensor further comprises a magnetic core assembly (7) and a coil (8), the magnetic core assembly (7) has: A magnetic core seat (71) having a support disc (712) and an intermediate sleeve (711) axially extending from the support disc (712), a receiving portion (717) is configured in the center of the intermediate sleeve (711), the intermediate sleeve (711) has a sleeve end (716) at one end away from the support disc (712), and an inwardly recessed portion (715) is configured on the outer side wall of the intermediate sleeve (711) near the sleeve end (716); A magnetic core cap (72) has a lower section (721) on the lower side, which is inserted into the accommodating portion (717), the center of the magnetic core cap (72) is configured with a center hole (722) open upward, the inner circumferential wall of the center hole (722) is configured with a glue flow groove (723) extending in the axial direction, the glue flow groove (723) has a radial opening (724), the center hole (722) communicates with the outside of the magnetic core cap (72) through the radial opening (724); A magnetic core (73) is sleeved on the outside of the magnetic core cap (72) and the magnetic core seat (71); There is a radial gap between the lower section (721) and the accommodating portion (717), there is an axial gap between the sleeve end (716) and the magnetic core cap (72), and there is a radial gap between the inwardly recessed portion (715) and the magnetic core (73).
9. The pressure sensor of claim 8, wherein, The magnetic core seat (71) also has a combination sleeve (713); The central part of the pressure sensing component (6) is configured with a carrier (62), the center of the carrier (62) is configured with a groove (67) open upward, and the carrier (62) has elasticity; The combination sleeve (713) has a radially outwardly protruding shoulder (714) at the lower end, the combination sleeve (713) is installed in the groove (67) in a form-fitting manner together with the shoulder (714), and the support disc (712) is supported on the carrier (62).
10. The pressure sensor of claim 9, wherein, A protrusion (68) is arranged in the center of the groove (67), which is inserted into the centering hole (719) in the bottom center of the shoulder (714).