Pressure sensor

Abstract

The utility model discloses a pressure sensor, which relates to the technical field of sensors and comprises a shell with an inner cavity; the diaphragm is arranged in an inner cavity of the shell, the diaphragm divides the inner cavity into a detection cavity, and the shell is provided with an air inlet leading to the detection cavity; the flat spiral spring is connected with the diaphragm in parallel, and the flat spiral spring is used for driving the diaphragm to perform reset movement; the magnetic core assembly is connected with one side, far away from the detection cavity, of the diaphragm; the coil framework is sleeved outside the magnetic core assembly, and a coil is wound on the coil framework; according to the utility model, the flat spiral spring is connected with the diaphragm in parallel, when the pressure change in the detection cavity enables the diaphragm to move, the flat spiral spring provides a stable reset force to ensure that the diaphragm can accurately return to the initial position, so that the detection accuracy is improved, and the detection precision is improved. Therefore, the repeatability and the stability of the detection are improved, and the requirement on the detection precision is met.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, specifically to a pressure sensor. Background Technology

[0002] The pressure sensor in the washing machine is used to monitor the water level in the inner tub in real time, providing water level information to the washing machine control system so as to accurately control the water intake and ensure that the water level is appropriate during the washing process, which can meet the washing needs and avoid water waste.

[0003] An electromagnetic pressure sensor mainly consists of a rubber diaphragm (strain gauge), a ferrite core assembly, a coil, and a set spring. Pressure generated by changes in water level is transmitted to the sensor via an air tube, causing the diaphragm and core assembly to move, thereby changing the inductance. The computer board determines the water level based on these changes in inductance.

[0004] However, existing electromagnetic pressure sensors typically rely solely on the interaction between a spring and a rubber diaphragm to adjust detection accuracy. However, the elastic deformation of the rubber diaphragm is unstable and sometimes fails to reset promptly, resulting in low detection accuracy and making it difficult to meet high-precision requirements. Utility Model Content

[0005] In view of this, the present invention provides a pressure sensor to solve the problem of low accuracy of existing pressure sensors.

[0006] In a first aspect, this utility model provides a pressure sensor, comprising:

[0007] A housing having an internal cavity;

[0008] A diaphragm is disposed in the inner cavity of the housing, the diaphragm dividing a portion of the inner cavity into a detection chamber, and the housing has an air inlet leading to the detection chamber;

[0009] A planar spiral spring is connected in parallel to the diaphragm, and the planar spiral spring is used to drive the diaphragm to perform a reset movement.

[0010] A magnetic core assembly is connected to the side of the diaphragm away from the detection cavity;

[0011] A coil frame is fitted over the outside of the magnetic core assembly, and a coil is wound on the coil frame;

[0012] A biasing element, connected to the magnetic core assembly, is used to drive the magnetic core assembly to move toward the detection cavity.

[0013] The technical solution of this utility model uses a diaphragm to divide the inner cavity of the housing into a detection chamber, and an air inlet connects the detection chamber to the outside. When a change in water level causes a change in pressure within the detection chamber, the diaphragm can sensitively sense the pressure change and generate a corresponding displacement. A magnetic core is connected to the diaphragm, and the displacement of the diaphragm causes the magnetic core to move synchronously. A coil frame, fitted around the magnetic core, is wound with a coil; changes in the position of the magnetic core cause changes in the coil inductance. By detecting changes in the coil inductance, changes in water level can be accurately converted into an electrical signal, achieving precise detection of the water level.

[0014] The planar spiral spring is connected in parallel to the diaphragm. When the pressure change in the detection chamber causes the diaphragm to shift, the planar spiral spring provides a stable restoring force to ensure that the diaphragm can accurately return to its initial position, preparing it for the next detection, improving the repeatability and stability of the detection, and meeting the detection accuracy requirements.

[0015] Optionally, the single strand cross-section of the planar spiral spring is circular. A planar spiral spring with a circular cross-section has stable elastic properties, can achieve a relatively uniform stress distribution when subjected to force, and its elastic coefficient is relatively stable. Within the elastic deformation range of the spring, applying the same external force will produce a relatively consistent deformation.

[0016] Optionally, the housing includes a detachable lower shell and an upper shell, with the coil frame detachably connected to the upper shell, and the diaphragm installed between the coil frame and the upper shell. This configuration simplifies the assembly process of the pressure sensor. During production, workers can first place the diaphragm at a specific position on the upper shell, and then easily install the coil frame onto the upper shell, completing the positioning and fixation of the diaphragm. This design reduces complex installation steps, improves assembly efficiency, and is particularly suitable for large-scale production scenarios, thereby reducing production costs.

[0017] When a pressure sensor malfunctions and requires maintenance, the detachable coil frame greatly facilitates repair personnel. Since the diaphragm is installed between the coil frame and the upper housing, repair personnel only need to remove the coil frame to directly access the diaphragm for inspection, cleaning, or replacement. For some vulnerable components, such as the diaphragm which may experience aging or damage due to prolonged use, this design allows for quick location and resolution of problems, shortening maintenance time and reducing maintenance costs. Simultaneously, the detachable coil frame also facilitates the inspection of other internal components, such as checking the connection between the magnetic core and the coil, improving the maintainability of the pressure sensor.

[0018] The detachable connection between the coil frame and the upper shell ensures both convenient installation and structural stability. Through a well-designed connection structure, such as using snap-fit ​​or threaded connections, the coil frame and upper shell can be tightly integrated, providing stable support for the diaphragm. During the operation of the pressure sensor, this effectively resists the effects of pressure changes, vibrations, and other factors on the diaphragm, ensuring its normal operation.

[0019] The diaphragm is installed between the coil frame and the upper shell, a structure that helps create a good seal. The upper shell and coil frame provide a seal for the diaphragm, preventing liquid or gas leakage from the detection chamber and affecting sensor performance. Good sealing is crucial for pressure sensors, especially when detecting pressurized liquids or gases. It ensures the isolation of the detection chamber from the external environment, guarantees that pressure changes are accurately transmitted to the diaphragm, and improves the reliability of water level detection.

[0020] Optionally, the coil frame is connected to the upper shell via a snap-fit ​​connection, and the upper shell and the lower shell are also connected via a snap-fit ​​connection. The snap-fit ​​connection between the coil frame and the upper shell, and between the upper shell and the lower shell, significantly simplifies the pressure sensor assembly process. On the production line, workers do not need complex tools; they only need to align the coil frame with the snap-fit ​​part of the upper shell and press firmly to engage the snap-fit ​​into the slot to complete the connection. Similarly, the snap-fit ​​connection between the upper shell and the lower shell can also be completed quickly. This greatly improves assembly efficiency, especially suitable for large-scale production scenarios, effectively reducing production costs and improving production speed and product quality consistency.

[0021] Optionally, the upper housing has a stepped surface to accommodate the planar spiral spring, with the diaphragm abutting the spring within the stepped surface. The stepped surface within the upper housing provides a precise positioning structure for the planar spiral spring. The diaphragm abutting the spring within the stepped surface ensures that the spring maintains a fixed position and orientation during the operation of the pressure sensor. This precise positioning ensures that the planar spiral spring always moves along the designed path during force application and reset, preventing spring offset or wobbling, thereby guaranteeing the stability of force transmission between the diaphragm and the spring.

[0022] Optionally, the magnetic core assembly includes: a magnetic core frame, a magnetic core, and a magnetic core sleeve, wherein the magnetic core frame and the magnetic core sleeve are detachably connected, and the magnetic core is installed between the magnetic core frame and the magnetic core sleeve.

[0023] The magnetic core assembly employs a detachable connection between the core frame and the core sleeve, with the core mounted between them, greatly simplifying the assembly process. During production, workers can first place the core on the core frame and then connect the core sleeve to the core frame, easily completing the assembly of the magnetic core assembly. This step-by-step assembly method reduces operational difficulty and improves production efficiency, making it particularly suitable for large-scale production scenarios.

[0024] When the pressure sensor requires maintenance or the core assembly malfunctions, the detachable core holder and core sleeve facilitate inspection, cleaning, or replacement of the core by maintenance personnel. Personnel can directly access the core simply by separating the core holder and core sleeve.

[0025] The core holder and core sleeve work together to provide precise positioning for the core. The core is securely mounted between them, ensuring its stable position during pressure sensor operation and preventing displacement due to external interference. This stable core position is crucial for ensuring an accurate correspondence between changes in coil inductance and diaphragm displacement.

[0026] Optionally, the core frame has a cylindrical portion for inserting the core sleeve, the core sleeve being tightly fitted to the cylindrical portion, and the core being tightly fitted to the outside of the cylindrical portion of the core frame. Using this design, the tight-fitting connection makes assembling the core assembly easier during assembly. Workers first tightly install the core onto the outside of the cylindrical portion of the core frame, then insert the cylindrical portion of the core frame into the core sleeve, thus completing the assembly of the core assembly. This intuitive and efficient assembly process shortens assembly time, reduces assembly difficulty, and helps improve overall production efficiency. Simultaneously, the simple assembly process reduces quality problems caused by improper assembly, improving the product yield.

[0027] Optionally, the outer wall of the magnetic core sleeve has several circumferentially spaced, axially extending first ribs, and the magnetic core frame is fitted onto the first ribs. Using this scheme, the operation of fitting the magnetic core frame onto the first ribs during assembly is simple and intuitive. The worker only needs to align the magnetic core frame with the ribs of the magnetic core sleeve and then fit it axially to complete the assembly of the magnetic core frame and the magnetic core sleeve. This assembly method does not require complex positioning tools or cumbersome operating steps, greatly shortening assembly time and improving assembly efficiency. Furthermore, since the cooperation between the ribs and the magnetic core frame has a certain guiding effect, even in mass production, the accuracy of assembly can be guaranteed, reducing quality problems caused by improper assembly.

[0028] Optionally, the cylindrical surface of the magnetic core frame has a plurality of circumferentially spaced, axially extending second ribs, and the magnetic core is fitted onto the second ribs. The circumferentially spaced second ribs on the cylindrical surface of the magnetic core frame fit tightly with the magnetic core sleeve fitted onto them, significantly enhancing the connection stability between the magnetic core frame and the magnetic core sleeve. Using this scheme, during assembly, the magnetic core sleeve only needs to be aligned and fitted onto the second ribs of the magnetic core frame, making the operation intuitive and simple. The axial extension characteristic of the ribs provides guidance for the installation of the magnetic core sleeve, making the assembly process smoother and reducing assembly time and difficulty. Moreover, due to the spaced distribution of the ribs, even in mass production, the consistency of the magnetic core sleeve installation position can be ensured, improving assembly quality and product yield.

[0029] Optionally, the coil frame has a receiving cavity for accommodating the magnetic core assembly. An adjusting member is threadedly connected to the coil frame, and this adjusting member is connected to the biasing member to adjust its biasing force. The threaded connection between the adjusting member and the coil frame allows for precise and controllable adjustment of the tension spring's force. By rotating the adjusting member, the tension of the tension spring can be subtly changed, thereby precisely adjusting the force applied to the magnetic core assembly. The receiving cavity within the coil frame provides a stable mounting position for the magnetic core assembly. The design of the receiving cavity ensures that the magnetic core assembly maintains the correct posture and position within the coil frame, preventing displacement due to external interference. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a perspective sectional view of a pressure sensor according to an embodiment of the present utility model;

[0032] Figure 2 for Figure 1 A three-dimensional sectional view of the upper shell of the housing and the planar spiral spring inside it.

[0033] Figure 3 for Figure 2 A three-dimensional diagram viewed from below;

[0034] Figure 4 for Figure 1 A three-dimensional sectional view of the diaphragm in the image;

[0035] Figure 5 for Figure 4 A three-dimensional diagram viewed from below;

[0036] Figure 6 for Figure 1 A three-dimensional sectional view of the core assembly;

[0037] Figure 7 for Figure 6 A schematic diagram of the magnetic core assembly after the magnetic core is hidden;

[0038] Figure 8 for Figure 7 A three-dimensional image;

[0039] Figure 9 for Figure 1 A three-dimensional sectional view of the coil frame;

[0040] Figure 10 for Figure 9 A three-dimensional diagram viewed from below.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Housing; 2. Diaphragm; 3. Air inlet; 4. Planar spiral spring; 5. Magnetic core assembly; 6. Coil frame; 7. Lower housing; 8. Upper housing; 9. Adjusting component; 10. Magnetic core frame; 11. Magnetic core; 12. Magnetic core sleeve; 13. Cylindrical part; 14. First rib; 15. Second rib; 16. Circumferential support part; 17. Sealing strip; 18. Abutting boss; 19. Protruding post; 20. Annular slot; 21. Circular mating surface; 22. Deformable part; 23. Support plate; 24. Receiving cavity. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0046] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0047] The following is combined with Figures 1 to 10 The following describes embodiments of the present invention.

[0048] like Figure 1 The diagram illustrates a specific implementation of the pressure sensor provided in this embodiment, comprising: a housing 1, a diaphragm 2, a planar spiral spring 4, a magnetic core assembly 5, a coil frame 6, and a biasing element. The biasing element is not shown in the diagram; in practical applications, a tension spring can be used as the biasing element and installed within the housing 1. However, this is not the only option; in some alternative implementations, other elements with biasing force, such as torsion springs, can also be used as the biasing element.

[0049] like Figure 1 As shown, in this embodiment, the housing 1 has an inner cavity, the diaphragm 2 is located in the inner cavity of the housing 1, and the diaphragm 2 divides a part of the inner cavity into a detection chamber. At the same time, the housing 1 has an air inlet 3 leading to the detection chamber.

[0050] like Figure 1 As shown, the planar spiral spring 4 is connected parallel to the diaphragm 2, and its function is to drive the diaphragm 2 to move in a reset position. The magnetic core assembly 5 is connected to the side of the diaphragm 2 away from the detection cavity. The coil frame 6 is sleeved on the outside of the magnetic core assembly 5, and a coil is wound on the coil frame 6. The biasing element is connected to the magnetic core assembly 5, and its function is to drive the magnetic core assembly 5 to move towards the detection cavity.

[0051] The pressure sensor provided in this embodiment divides the inner cavity of the housing 1 into a detection chamber via a diaphragm 2, and an air inlet 3 connects the detection chamber to the outside. When a change in water level causes a change in pressure within the detection chamber, the diaphragm 2 can sensitively sense the pressure change and generate a corresponding displacement. The magnetic core 11 is connected to the diaphragm 2, and the displacement of the diaphragm 2 causes the magnetic core 11 to move synchronously. A coil frame 6, which is fitted around the magnetic core 11, winds a coil. Changes in the position of the magnetic core 11 cause changes in the coil inductance. By detecting changes in the coil inductance, changes in water level can be accurately converted into an electrical signal, achieving precise detection of the water level.

[0052] The planar spiral spring 4 is connected in parallel to the diaphragm 2. When the pressure change in the detection chamber causes the diaphragm 2 to shift, the planar spiral spring 4 provides a stable restoring force to ensure that the diaphragm 2 can accurately return to its initial position, prepare for the next detection, improve the repeatability and stability of the detection, and meet the detection accuracy requirements.

[0053] like Figure 2 As shown, in this embodiment, the single-strand cross-sectional shape of the planar spiral spring 4 is circular. This circular cross-section planar spiral spring 4 possesses stable elastic properties. When subjected to external force, it can achieve a relatively uniform stress distribution, and its elastic coefficient is also relatively stable. That is to say, within the allowable range of elastic deformation of the spring, as long as the same amount of external force is applied, the spring will produce a relatively uniform deformation. Of course, the above description is not limiting. In some alternative embodiments, the single-strand cross-sectional shape of the planar spiral spring 4 can also be other conventional shapes, such as square.

[0054] like Figure 1 , Figure 3 As shown, in this embodiment, the housing 1 includes a detachable lower housing 7 and an upper housing 8. The coil frame 6 is detachably connected to the upper housing 8, and the diaphragm 2 is installed between the coil frame 6 and the upper housing 8. This structure simplifies the assembly process of the pressure sensor. In actual production, workers can first place the diaphragm 2 in the designated position on the upper housing 8, and then easily install the coil frame 6 onto the upper housing 8, thus completing the positioning and fixing of the diaphragm 2. This design eliminates complicated installation steps, improves assembly efficiency, and is particularly suitable for large-scale production, helping to reduce production costs.

[0055] When the pressure sensor malfunctions and requires maintenance, the detachable coil frame 6 provides significant convenience for maintenance personnel. Since the diaphragm 2 is installed between the coil frame 6 and the upper housing 8, maintenance personnel only need to remove the coil frame 6 to directly access the diaphragm 2 for inspection, cleaning, or replacement. For some easily damaged components, such as the diaphragm 2, which may experience aging or breakage due to long-term use, this design allows for quick location and resolution of problems, shortening maintenance time and reducing maintenance costs. Simultaneously, the detachable coil frame 6 also facilitates the inspection of other internal components, such as checking the connection between the magnetic core 11 and the coil, improving the maintainability of the pressure sensor.

[0056] The detachable connection between the coil frame 6 and the upper shell 8 ensures both convenient installation and structural stability. Through a well-designed connection structure, such as using snap-fit ​​or threaded connections, the coil frame 6 and the upper shell 8 can be tightly integrated, providing stable support for the diaphragm 2. During the operation of the pressure sensor, this effectively resists the effects of pressure changes, vibrations, and other factors on the diaphragm 2, ensuring its normal operation.

[0057] The diaphragm 2 is installed between the coil frame 6 and the upper shell 8. This structure helps to create a good seal. The upper shell 8 and the coil frame 6 can provide a certain degree of sealing for the diaphragm 2, preventing liquid or gas leakage from the detection chamber and affecting the sensor's performance. Good sealing is crucial for pressure sensors, especially when detecting pressurized liquids or gases. It ensures the isolation of the detection chamber from the external environment, ensuring that pressure changes are accurately transmitted to the diaphragm 2, and improving the reliability of water level detection.

[0058] like Figure 1 , Figure 3 As shown, in this embodiment, the coil frame 6 is connected to the upper shell 8 by a snap-fit ​​connection, and the upper shell 8 and the lower shell 7 are also connected by a snap-fit ​​connection. The snap-fit ​​connection between the coil frame 6 and the upper shell 8, and between the upper shell 8 and the lower shell 7, significantly simplifies the assembly process of the pressure sensor. On the production line, workers do not need complex tools; they only need to align the coil frame 6 with the snap-fit ​​part of the upper shell 8 and press firmly to make the snap-fit ​​engage the slot, thus completing the connection between the coil frame 6 and the upper shell 8. Similarly, the snap-fit ​​connection between the upper shell 8 and the lower shell 7 can also be completed quickly. This greatly improves assembly efficiency, especially suitable for large-scale production scenarios, effectively reducing production costs and improving production speed and product quality consistency.

[0059] Of course, the above description is not limiting. In some alternative embodiments, the coil frame 6 and the upper shell 8, as well as the upper shell 8 and the lower shell 7, can also be connected by other conventional structures, such as threaded connections.

[0060] like Figure 2 , Figure 3 As shown, in this embodiment, the upper shell 8 has a stepped surface to accommodate the planar spiral spring 4, and the planar spiral spring 4 is abutted against the diaphragm 2 within the stepped surface. The stepped surface within the upper shell 8 provides a precise positioning structure for the planar spiral spring 4. The planar spiral spring 4 being abutted against by the diaphragm 2 within the stepped surface ensures that the spring maintains a fixed position and orientation during the operation of the pressure sensor. This precise positioning ensures that the planar spiral spring 4 always moves along the designed path during force application and reset, avoiding spring offset or wobbling, thereby guaranteeing the stability of force transmission between the diaphragm 2 and the spring.

[0061] like Figure 4 , Figure 5As shown, in this embodiment, the diaphragm 2 has a circumferential support portion 16, which is used to be clamped between the magnetic core assembly 5 and the upper shell 8. The circumferential support portion 16 has at least one sealing protrusion 17 on the surface that abuts against the upper shell 8, which serves to enhance the sealing effect.

[0062] like Figure 4 , Figure 5 As shown, the diaphragm 2 has a protruding abutment 18 at its center, protruding towards the upper shell 8. The abutment 18 is used to abut against the center of the planar spiral spring 4, thereby being reset by the force of the planar spiral spring 4. The back of the abutment 18 has a protruding post 19 for cooperating with the magnetic core assembly 5. An annular slot 20 is formed around the protruding post 19. The protruding post 19 and the annular slot 20 are used together to cooperate with the magnetic core assembly 5, so that the magnetic core assembly 5 is linked with the diaphragm 2 and the planar spiral spring 4.

[0063] like Figure 4 , Figure 5 As shown, the diaphragm 2 has a circular mating surface 21 on the side facing the magnetic core assembly 5 between its center and periphery. The circular mating surface 21 is a plane and is used to fit and mate with the magnetic core assembly 5, thereby improving the linkage accuracy between the magnetic core assembly 5 and the diaphragm 2.

[0064] like Figure 4 , Figure 5 As shown, the deformable portion 22 is located between the circular mating surface 21 of the diaphragm 2 and the circumferential support portion 16. This deformable portion 22 is an arc shape with a significantly thinner thickness. The design of this significantly thinner arc shape makes the diaphragm 2 extremely sensitive to pressure changes. When the pressure inside the detection chamber changes, the thinner arc-shaped deformable portion 22 can quickly deform. While ensuring the diaphragm 2's sensitive deformation, the thinner arc-shaped deformable portion 22, through reasonable stress distribution, reduces fatigue damage to the diaphragm 2 during repeated deformation.

[0065] like Figure 6 , Figure 7 , Figure 8 As shown, in this embodiment, the magnetic core assembly 5 includes: a magnetic core frame 10, a magnetic core 11, and a magnetic core sleeve 12. The magnetic core frame 10 and the magnetic core sleeve 12 are detachably connected, and the magnetic core 11 is installed between the magnetic core frame 10 and the magnetic core sleeve 12.

[0066] The magnetic core assembly 5 employs a detachable connection between the magnetic core frame 10 and the magnetic core sleeve 12, with the magnetic core 11 mounted between them, greatly simplifying the assembly process. During production, workers can first place the magnetic core 11 on the magnetic core frame 10, then connect the magnetic core sleeve 12 to the magnetic core frame 10, easily completing the assembly of the magnetic core assembly 5. This step-by-step assembly method reduces operational difficulty and improves production efficiency, making it particularly suitable for large-scale production scenarios.

[0067] When the pressure sensor requires maintenance or the magnetic core assembly 5 malfunctions, the detachable magnetic core holder 10 and magnetic core sleeve 12 facilitate maintenance personnel in inspecting, cleaning, or replacing the magnetic core 11. Maintenance personnel can directly access the magnetic core 11 simply by separating the magnetic core holder 10 and magnetic core sleeve 12.

[0068] The magnetic core holder 10 and the magnetic core sleeve 12 work together to provide precise positioning for the magnetic core 11. The magnetic core 11 is securely mounted between them, ensuring its stable position during pressure sensor operation and preventing displacement due to external interference. This stable position of the magnetic core 11 is crucial for ensuring an accurate correspondence between changes in coil inductance and the displacement of the diaphragm 2.

[0069] like Figure 6 , Figure 7 , Figure 8 As shown, in this embodiment, the magnetic core frame 10 has a hollow cylindrical structure on its upper surface for inserting the diaphragm 2 into an annular slot 20. The center of the hollow cylindrical structure is adapted to insert the protruding post 19 of the diaphragm 2, and the peripheral wall of the hollow cylindrical structure is adapted to insert into the annular slot 20 of the diaphragm 2. This creates a stable interlocking and positioning structure between the magnetic core frame 10 and the diaphragm 2.

[0070] like Figure 6 , Figure 7 , Figure 8 As shown in this embodiment, the magnetic core frame 10 also has a support disk 23 on its upper surface. The upper surface of the support disk 23 is a plane. The upper surface of the support disk 23 is used to fit and cooperate with the circular mating surface 21 of the diaphragm 2, thereby improving the accuracy of the linkage between the magnetic core assembly 5 and the diaphragm 2.

[0071] like Figure 6 , Figure 7 , Figure 8As shown, in this embodiment, the magnetic core frame 10 has a cylindrical portion 13 for inserting the magnetic core sleeve 12. The magnetic core sleeve 12 is tightly fitted to the cylindrical portion 13, and the magnetic core 11 is tightly fitted to the outside of the cylindrical portion 13 of the magnetic core frame 10. Using this scheme, the tight-fitting connection makes the assembly of the magnetic core assembly 5 easier during assembly. The worker first tightly installs the magnetic core 11 onto the outside of the cylindrical portion 13 of the magnetic core frame 10, and then inserts the cylindrical portion 13 of the magnetic core frame 10 into the magnetic core sleeve 12, thus completing the assembly of the magnetic core assembly 5. This intuitive and efficient assembly process shortens assembly time, reduces assembly difficulty, and helps improve overall production efficiency. At the same time, the simple assembly process also reduces quality problems caused by improper assembly, improving the product yield.

[0072] like Figure 6 , Figure 7 , Figure 8 As shown in this embodiment, the outer wall of the magnetic core sleeve 12 has several circumferentially spaced, axially extending first ribs 14, and the magnetic core frame 10 is fitted onto the first ribs 14. Using this scheme, the operation of fitting the magnetic core frame 10 onto the first ribs 14 during assembly is simple and intuitive. The worker only needs to align the magnetic core frame 10 with the ribs of the magnetic core sleeve 12 and then fit it axially to complete the assembly of the magnetic core frame 10 and the magnetic core sleeve 12. This assembly method does not require complex positioning tools or cumbersome operating steps, greatly shortening assembly time and improving assembly efficiency. Furthermore, since the cooperation between the ribs and the magnetic core frame 10 has a certain guiding effect, even in mass production, the accuracy of assembly can be guaranteed, reducing quality problems caused by improper assembly.

[0073] like Figure 6 , Figure 7 , Figure 8 As shown in this embodiment, the cylindrical surface of the magnetic core frame 10 has several circumferentially spaced, axially extending second ribs 15, and the magnetic core sleeve 12 is disposed on the second ribs 15. The circumferentially spaced second ribs 15 on the cylindrical surface of the magnetic core frame 10 fit tightly with the magnetic core sleeve 12 fitted thereon, significantly enhancing the connection stability between the magnetic core frame 10 and the magnetic core sleeve 12. Using the above scheme, during assembly, the magnetic core sleeve 12 only needs to be aligned and fitted onto the second ribs 15 of the magnetic core frame 10, making the operation intuitive and simple. The axial extension characteristic of the ribs provides guidance for the installation of the magnetic core sleeve 12, making the assembly process smoother and reducing assembly time and difficulty. Moreover, due to the spaced distribution of the ribs, even in mass production, the consistency of the installation position of the magnetic core sleeve 12 can be ensured, improving assembly quality and product yield.

[0074] like Figure 9 , Figure 10As shown, the coil frame 6 has a receiving cavity 24 for accommodating the magnetic core assembly 5. The coil frame 6 is threadedly connected to an adjusting member 9, which is connected to the biasing member and used to adjust the biasing force of the biasing member. The threaded connection between the adjusting member 9 and the coil frame 6 makes the adjustment of the tension spring's force precise and controllable. By rotating the adjusting member 9, the tension of the tension spring can be slightly changed, thereby precisely adjusting the force applied to the magnetic core assembly 5. The receiving cavity 24 within the coil frame 6 provides a stable mounting position for the magnetic core assembly 5. The design of the receiving cavity 24 ensures that the magnetic core assembly 5 maintains the correct posture and position within the coil frame 6, preventing displacement due to external interference.

[0075] Of course, the above description is not limiting. In some alternative embodiments, the adjustment element 9 may be omitted, or it may be connected to the coil frame 6 using other conventional structures, such as snap-fit ​​connection.

[0076] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A pressure sensor, characterized by include: A housing (1) having an inner cavity; A diaphragm (2) is disposed in the inner cavity of the housing (1), the diaphragm (2) dividing a portion of the inner cavity into a detection chamber, and the housing (1) has an air inlet (3) leading to the detection chamber; A planar spiral spring (4) is connected in parallel to the diaphragm (2), and the planar spiral spring (4) is used to drive the diaphragm (2) to move back to its original position; The magnetic core assembly (5) is connected to the side of the diaphragm (2) away from the detection cavity; A coil frame (6) is fitted over the outside of the magnetic core assembly (5), and a coil is wound on the coil frame (6); A biasing element is connected to the magnetic core assembly (5) and is used to drive the magnetic core assembly (5) to move toward the detection cavity.

2. The pressure sensor of claim 1, wherein, The single strand cross-section of the planar spiral spring (4) is circular.

3. The pressure sensor of claim 1, wherein, The housing (1) includes a detachable lower housing (7) and an upper housing (8), the coil frame (6) is detachably connected to the upper housing (8), and the diaphragm (2) is installed between the coil frame (6) and the upper housing (8).

4. The pressure sensor of claim 3, wherein, The coil frame (6) is connected to the upper shell (8) by a snap-fit ​​connection, and the upper shell (8) and the lower shell (7) are connected by a snap-fit ​​connection.

5. The pressure sensor of claim 3, wherein, The upper shell (8) has a stepped surface that accommodates the planar spiral spring (4), and the planar spiral spring (4) is abutted against the stepped surface by the diaphragm (2).

6. The pressure sensor of claim 1, wherein, The magnetic core assembly (5) includes: a magnetic core frame (10), a magnetic core (11) and a magnetic core sleeve (12). The magnetic core frame (10) and the magnetic core sleeve (12) are detachably connected. The magnetic core (11) is installed between the magnetic core frame (10) and the magnetic core sleeve (12).

7. The pressure sensor of claim 6, wherein, The magnetic core frame (10) has a cylindrical portion (13) for inserting the magnetic core sleeve (12), the magnetic core sleeve (12) is tightly fitted to the cylindrical portion (13), and the magnetic core (11) is tightly fitted to the outside of the cylindrical portion (13) of the magnetic core frame (10).

8. The pressure sensor of claim 7, wherein, The outer wall of the magnetic core sleeve (12) has a plurality of first ribs (14) that are circumferentially spaced and extend axially, and the magnetic core frame (10) is sleeved on the first ribs (14).

9. The pressure sensor of claim 7, wherein, The cylindrical surface of the magnetic core frame (10) has a plurality of second ribs (15) that are circumferentially spaced and extend axially, and the magnetic core sleeve (12) is disposed on the second ribs (15).

10. The pressure sensor according to any one of claims 1-9, characterized in that, The coil frame (6) has a receiving cavity (24) for accommodating the magnetic core assembly (5). The coil frame (6) is connected to an adjusting member (9) by a thread. The adjusting member (9) is connected to the biasing member and is used to adjust the biasing force of the biasing member.

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