Pressure sensor and electrical appliance
By designing a novel structure and guiding positioning system for the moving parts and magnetic core in the pressure sensor, the problems of easy damage to the magnetic core and high cost are solved, and high-precision detection suitable for large medium pressure is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN STARWIN TECHNOLOGY CO LTD
- Filing Date
- 2025-12-12
- Publication Date
- 2026-07-24
Smart Images
Figure CN224552595U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of pressure sensor technology, specifically relating to a pressure sensor and an electrical device. Background Technology
[0002] In related technologies, pressure sensors have an electromagnetic coil, a spring, a movable part, and a magnetic core. The movable part, the magnetic core, and the spring are arranged sequentially along the axial direction of the spring. The magnetic core rests against the movable part and the spring. When the movable part moves under the drive of the medium pressure, it pushes the magnetic core to move and compress the spring. The electromagnetic coil detects the medium pressure through mutual inductance with the magnetic core.
[0003] Pressure sensors in related technologies are only suitable for detecting relatively small media pressures. When the media pressure is large, there is a risk that the magnetic core will be damaged by moving parts and springs. In addition, as the media pressure increases, a larger spring is required. At this time, the size of both the magnetic core and the electromagnetic coil needs to be increased accordingly to meet the installation and adaptation requirements of the magnetic core and the spring, as well as the mutual inductance requirements of the magnetic core and the electromagnetic coil. However, increasing the size of the magnetic core and the electromagnetic coil not only affects the volume of the pressure sensor, but also increases the cost of the pressure sensor excessively. Utility Model Content
[0004] This application aims to provide a pressure sensor and an electrical device. The pressure sensor is suitable for detecting large media pressures and is small in size, low in cost, and has good reliability.
[0005] The first aspect of this application proposes a pressure sensor, comprising: a housing; a movable component having a body portion for displacement movement driven by medium pressure, the body portion having a side protrusion protruding to the side of the body portion; a magnetic core disposed on the side protrusion and displacing synchronously with the body portion; a first spring, one end of the first spring facing the body portion and the other end of the first spring facing the housing, the first spring deforming in conjunction with the displacement movement of the body portion driven by medium pressure; and an electromagnetic coil disposed in the housing for mutual inductance with the magnetic core.
[0006] In this application's technical solution, the main body of the movable component directly abuts against the first spring. A side protrusion is provided on the main body, and the magnetic core is mounted on the side protrusion to move synchronously with the main body. This achieves mutual inductance between the electromagnetic coil and the magnetic core to detect medium pressure, and even with a large first spring, the magnetic core will not be damaged, thus improving the reliability of the pressure sensor and making it suitable for detecting high-pressure media. Furthermore, since the magnetic core is located on the side protrusion, changes in the size of the first spring do not affect the magnetic core's installation adaptability. Therefore, the dimensions of the magnetic core and electromagnetic coil do not need to change accordingly with changes in the first spring's size, thus balancing the pressure sensor's size and cost. Moreover, by directly abutting the main body of the movable component against the first spring, compared to the structure in related technologies where the movable component abuts against the spring via the magnetic core, the intermediate force transmission link of the magnetic core is reduced, shortening the force transmission distance and improving the stability and reliability of the movable component's movement, thereby enhancing the pressure sensor's measurement accuracy.
[0007] According to some technical solutions of this application, optionally, the pressure sensor further includes: a second spring, one end of the second spring facing the side opposite to the protrusion of the magnetic core, and the other end of the second spring facing the housing. When the magnetic core moves, the second spring deforms in conjunction, wherein the elastic modulus of the first spring is greater than that of the second spring.
[0008] In this design, a second spring is placed between the housing and the magnetic core, which improves the reset accuracy of the magnetic core. Since the elastic modulus of the second spring is smaller than that of the first spring, the elastic force of the second spring is smaller than that of the first spring under the same displacement. This ensures that the elastic force provided by the second spring is sufficient to meet the reset requirements of the magnetic core. Therefore, the problem of the magnetic core being crushed is unlikely to occur.
[0009] Furthermore, it is understandable that since the elastic modulus of the second spring is relatively smaller than that of the first spring, it generally means that the size of the second spring is also correspondingly smaller than that of the first spring. By placing the magnetic core on the side protrusion, the magnetic core avoids contact with the larger first spring, and instead uses the smaller second spring to contact the magnetic core. Compared to the related technology that directly uses a larger spring to contact the magnetic core, the smaller size of the second spring results in a smaller eddy current intensity in the alternating magnetic field of the electromagnetic coil. The reverse magnetic field generated by the eddy current on the second spring is correspondingly weaker, and the magnetic field interference of the second spring on the magnetic core and electromagnetic coil is also less, thereby reducing the signal noise of the pressure sensor. At the same time, the smaller size of the second spring also reduces the shunting current of the magnetic flux of the second spring on the electromagnetic coil, so that the magnetic field generated by the electromagnetic coil is more concentrated for mutual inductance with the magnetic core, thereby improving the sensitivity of the pressure sensor.
[0010] According to some technical solutions of this application, optionally, the magnetic core is located on the radial side of the first spring, and there is a gap between the magnetic core and the first spring; the electromagnetic coil is located on the radial side of the first spring, and the electromagnetic coil and the magnetic core are arranged correspondingly.
[0011] In this design, a gap is created between the magnetic core and the first spring. This reduces the interference of the first spring on the magnetic core's magnetic field and also reduces interference between the magnetic core and the first spring, thereby improving the reliability and sensitivity of the pressure sensor. The electromagnetic coil is positioned radially to the first spring and corresponding to the magnetic core. This prevents the first spring from excessively shunting the electromagnetic coil's magnetic flux, further enhancing the pressure sensor's detection sensitivity.
[0012] According to some technical solutions of this application, optionally, a first groove is provided on the main body, and the end of the first spring facing the main body is located in the first groove; a second groove is provided on the side protrusion, and there is a gap between the first groove and the second groove, and at least a part of the magnetic core is located in the second groove; and / or the magnetic core is bonded to the side protrusion; and / or a positioning rod is provided on the side protrusion, the magnetic core has a ring structure, and the magnetic core is located on the side protrusion and nested on the outside of the positioning rod.
[0013] In this solution, the end of the first spring facing the main body is placed in the first groove, and at least a part of the magnetic core is placed in the second groove. This allows for quick installation and positioning of the first spring and the magnetic core with the main body, which not only improves the assembly efficiency of the product but also ensures the relative positional accuracy between the first spring and the magnetic core, thereby reducing the magnetic field interference of the first spring on the magnetic core and the electromagnetic coil.
[0014] According to some technical solutions of this application, optionally, the housing is provided with a guide hole, the shape of the end of the main body facing away from the first spring is adapted to the shape of the guide hole, and the end of the main body facing away from the first spring passes through the guide hole.
[0015] In this design, a guide hole is provided on the housing, and the end of the main body facing away from the first spring passes through the guide hole and is adapted to the shape of the guide hole. The guide hole guides the displacement movement of the main body, thus correcting the displacement direction of the main body to the center line direction of the guide hole. This avoids the displacement direction deviation of the main body due to torque caused by the gravity of the side protrusion and the magnetic core or the elastic force of the second spring, thereby improving the detection accuracy of the pressure sensor.
[0016] According to some technical solutions of this application, optionally, the body part has a first boss and a side flange. One end of the first boss extends to the side to form a side flange. The first boss is inserted into the guide hole. The shape of the first boss is adapted to the shape of the guide hole. The side flange is used to abut against the part around the guide hole to limit the first boss. The side protrusion is provided on the side flange.
[0017] In this design, the first boss is inserted into the guide hole and the side flange is used to limit the first boss. This reduces the force on the side protrusion, lowers the risk of damage or deformation to the side protrusion, thereby improving the assembly stability and positional accuracy of the magnetic core and effectively ensuring the accuracy of the pressure sensor.
[0018] According to some technical solutions of this application, optionally, the pressure sensor further includes: an elastic diaphragm, which blocks the end of the guide hole facing the outside of the housing. The medium pressure pushes the elastic diaphragm from the side of the elastic diaphragm facing away from the guide hole, causing the elastic diaphragm to deform and the body to move along the guide hole.
[0019] In this design, an elastic diaphragm is used to shield the end of the guide hole facing the outside of the housing. This reduces the amount of moisture and foreign matter entering the housing through the guide hole, thereby improving the working environment of the first spring and the magnetic core and extending the life of the pressure sensor.
[0020] According to some technical solutions of this application, optionally, a second protrusion is provided at one end of the body facing the elastic diaphragm, a third groove is provided on the top surface of the second protrusion, a recess is provided on the elastic diaphragm at the position corresponding to the second protrusion, a protruding post is provided on the inner bottom surface of the recess, the second protrusion extends into the recess, and the protruding post extends into the third groove; and / or the pressure sensor also includes a connecting cover, the connecting cover is connected to the housing, the edge of the elastic diaphragm is pressed between the connecting cover and the housing, a medium channel is provided on the connecting cover, and the medium channel corresponds to the side of the elastic diaphragm opposite to the guide hole.
[0021] In this design, a recess is provided on the elastic diaphragm. The diaphragm can deform to flatten this recess, thereby increasing its deformability and providing greater displacement of the moving part, thus achieving a wider pressure detection range. The protruding post enhances the structural strength at the center of the diaphragm, reducing weak points and the risk of breakage, while also improving its pressure resistance. The second protrusion extending into the recess and the third groove accommodating the protruding post improve the fit between the moving part's surface shape and the diaphragm's shape, thereby enhancing the uniformity of pressure distribution on the moving part.
[0022] A connecting cover with a medium channel is provided, allowing the medium to be directionally transmitted to the surface of the elastic diaphragm to detect the medium pressure, making the pressure sensor more convenient to use.
[0023] Optionally, according to some technical solutions of this application, a first positioning hole and a second positioning hole are provided inside the housing, the end of the first spring facing the housing extends into the first positioning hole, and the end of the magnetic core away from the side protrusion extends into the second positioning hole.
[0024] In this design, a first positioning hole and a second positioning hole are provided inside the housing to accommodate the first spring and the magnetic core, respectively. The positioning holes can serve as guides, thereby improving the accuracy of the deformation direction of the first spring and the accuracy of the movement direction of the magnetic core, thus enhancing the detection accuracy and reliability of the pressure sensor.
[0025] According to some technical solutions of this application, optionally, the first positioning hole and the second positioning hole are provided at intervals; and / or a guide groove is also provided in the housing, with the side protrusion and the guide groove corresponding to each other.
[0026] In this design, the first positioning hole and the second positioning hole are spaced apart, which can increase the creepage distance between the first spring and the magnetic core. When an induced current is generated on the first spring, the interference of the current of the first spring on the magnetic field of the magnetic core can be reduced, thereby reducing the detection noise of the pressure sensor.
[0027] A guide groove is provided on the housing. The guide groove cooperates with the side protrusion, so that the side protrusion can move along the guide groove during the displacement movement of the main body. At the same time, the rotation of the moving parts can be restricted by the cooperation of the guide groove and the side protrusion. This improves the accuracy of the relative position of the magnetic core and the electromagnetic coil, thereby improving the detection accuracy of the pressure sensor.
[0028] According to some technical solutions of this application, optionally, the housing includes: a first cover; a base, the first cover being connected to one end of the base, the first cover and the base forming a receiving cavity, the first spring, the movable part and the magnetic core being disposed in the receiving cavity, the first cover being provided with a guide hole adapted to the main body; a second cover being connected to one end of the base opposite to the first cover, the electromagnetic coil being disposed between the second cover and the base.
[0029] In this solution, by using a shared base, the first spring, the movable part, and the magnetic core are housed between the base and the first cover, while the electromagnetic coil is housed between the second cover and the base. This not only provides protection for the first spring, the movable part, the magnetic core, and the electromagnetic coil, but also simplifies and integrates the housing.
[0030] According to some technical solutions of this application, optionally, the base body is provided with a connecting hole, the second cover body is provided with a connecting post, a through hollow area is formed inside the connecting post, the connecting post is provided with a snap-fit part, the connecting post passes through the connecting hole and snaps with the connecting hole through the snap-fit part, and the receiving cavity communicates with the outside through the hollow area.
[0031] In this design, the second cover is snapped into the base via a connecting post, and the connecting post has a hollow area. The cavity formed by the base and the first cover is connected to the outside through the hollow area, which allows for pressure relief within the cavity and improves the accuracy of pressure detection.
[0032] The second aspect of this application provides an electrical device that includes the pressure sensor described in any of the above-mentioned technical solutions.
[0033] In this embodiment, the electrical equipment possesses all the above-mentioned beneficial effects because it is equipped with a pressure sensor as described in any of the above technical solutions, which will not be elaborated further here.
[0034] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0035] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0036] Figure 1 This is a front view schematic diagram of the pressure sensor in some embodiments of this application.
[0037] Figure 2 This is a bottom view of the pressure sensor structure in some embodiments of this application.
[0038] Figure 3 yes Figure 1 A schematic diagram of the cross-sectional structure of section AA shown in the figure.
[0039] Figure 4 yes Figure 1 The diagram shows a cross-sectional view of the BB section.
[0040] Figure 5 This is an exploded structural diagram of the pressure sensor in some embodiments of this application.
[0041] Figure 6 This is one of the three-dimensional structural schematic diagrams of the movable component in some embodiments of this application.
[0042] Figure 7 This is a schematic diagram of the main view structure of the active component in some embodiments of this application.
[0043] Figure 8 This is the second of the three-dimensional structural schematic diagrams of the movable parts in some embodiments of this application.
[0044] Figure 9 This is one of the partial structural schematic diagrams of the pressure sensor in some embodiments of this application.
[0045] Figure 10 This is the second of several schematic diagrams showing the partial structure of the pressure sensor in some embodiments of this application.
[0046] Figure 11 This is a three-dimensional structural schematic diagram of the pressure sensor in some embodiments of this application.
[0047] Figure 12 This is one of the partially exploded structural diagrams of the pressure sensor in some embodiments of this application.
[0048] Figure 13 This is the second partially exploded structural diagram of the pressure sensor in some embodiments of this application.
[0049] Figure 14 This is a cross-sectional structural diagram of a coffee machine in some embodiments of this application.
[0050] Figure label:
[0051] 10. Coffee machine; 11. Pressure sensor; 12. Water tank; 13. Pressure boosting / depressurization device; 14. Heating device; 15. Pipe; 16. Brewing head; 17. Control panel; 18. T-joint; 100. Housing; 101. Receiving cavity; 110. First cover; 111. Guide hole; 120. Base; 121. First positioning hole; 122. Second positioning hole; 123. Guide groove; 1231. Guide post; 124. Connecting hole; 125. Mounting groove; 130. Second cover; 131. Connecting post; 132. Snap-fit part; 133. Hollow area; 134. Notch; 200. Moving part; 210. Body part; 211. First boss; 212. Side flange; 213. Second boss; 214. Third groove; 215. First groove; 220. Side protrusion; 221. Second groove; 300. Magnetic core; 410. First spring; 420. Second spring; 500. Electromagnetic coil; 600. Circuit board; 700. Elastic diaphragm; 701. Recess; 702. Protrusion; 800. Connecting cover; 801. Medium channel; 900. Connector. Detailed Implementation
[0052] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0053] The terms "first," "second," and "third" in the specification and claims of this application may explicitly or implicitly include one or more of the features described herein. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0054] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by the term "y" etc. is based on the orientation or positional relationship shown in the drawings and is only for the convenience of describing this utility model and simplifying the description, and is not intended to 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.
[0055] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0056] Currently, some electrical appliances have relatively limited pressure detection methods due to the high internal pressure of the medium. For example, coffee machines have high internal pressure. Currently, there are two types of coffee machines: those using pressure gauges and those using ceramic sensors. Coffee machines using pressure gauges are relatively inexpensive; however, these machines require users to visually observe the pressure gauge data and manually operate the machine based on that data. Since human readings can have significant deviations, this can easily affect the coffee extraction effect and poses safety hazards. Coffee machines using ceramic sensors, due to the high cost of ceramic sensors, are generally limited to high-end coffee machines due to cost constraints, and their adoption is not widespread.
[0057] In related technologies, pressure sensors include an electromagnetic coil, a spring, a moving part, and a magnetic core. The moving part, magnetic core, and spring are arranged sequentially along the spring's axis. The magnetic core rests between the moving part and the spring. When the moving part moves under the influence of medium pressure, it pushes the magnetic core to compress the spring. The electromagnetic coil detects the medium pressure through mutual inductance with the magnetic core. While this type of pressure sensor is less expensive than ceramic sensors, it is only suitable for detecting relatively small medium pressures. For electrical appliances with high internal medium pressures, such as coffee machines, this type of pressure sensor cannot meet the corresponding pressure measurement requirements. If this type of pressure sensor is forced to be used in situations with high medium pressures, there is a risk that the magnetic core will be damaged by the moving part and the spring. Furthermore, as the medium pressure increases, a larger spring is required. This necessitates increasing the size of both the magnetic core and the electromagnetic coil to meet the installation and adaptation requirements of the magnetic core and spring, as well as the mutual inductance requirements. However, increasing the size of the magnetic core and electromagnetic coil not only affects the overall size of the pressure sensor but also excessively increases its cost.
[0058] In response, embodiments of this application provide a pressure sensor and an electrical device. The pressure sensor of this application can be applied to electrical devices with high internal medium pressure, such as coffee machines.
[0059] The following will combine Figures 1 to 14 The pressure sensors and electrical devices in some embodiments of this application are described in detail.
[0060] Specifically, in combination Figure 1 and Figure 3 It is understood that the first aspect of this application proposes a pressure sensor 11, including: a housing 100, a movable part 200, a magnetic core 300, a first spring 410, and an electromagnetic coil 500.
[0061] The movable component 200 has a body portion 210, which is used to perform displacement movement under the drive of medium pressure. The body portion 210 is provided with a side protrusion 220 protruding to the side of the body portion 210. The magnetic core 300 is provided on the side protrusion 220 and moves synchronously with the body portion 210. One end of the first spring 410 faces the body portion 210 and the other end of the first spring 410 faces the housing 100. When the body portion 210 moves under the drive of medium pressure, the first spring 410 deforms in conjunction. The electromagnetic coil 500 is provided on the housing 100 and is used to induct with the magnetic core 300.
[0062] The displacement directions of the main body 210 and the side protrusion 220 are determined by... Figure 3 and Figure 10 The y-direction is illustrated in the diagram.
[0063] The mutual inductance between the electromagnetic coil 500 and the magnetic core 300 can be understood as follows: the magnetic core 300 moves closer to or further away from the electromagnetic coil 500, thereby affecting the inductance of the electromagnetic coil 500. For example, the magnetic core 300 moves closer to the electromagnetic coil 500 to increase the inductance of the electromagnetic coil 500, and moves further away from the electromagnetic coil 500 to decrease the inductance of the electromagnetic coil 500, so that the electromagnetic coil 500 generates different electrical signals based on the change in inductance.
[0064] In the technical solution of this application, the main body 210 moves under the drive of the medium pressure to generate a displacement corresponding to the medium pressure. The magnetic core 300 moves synchronously with the main body 210 to generate approximately the same displacement. The electromagnetic coil 500 generates an electrical signal matching the current medium pressure through mutual inductance with the magnetic core 300, thereby realizing the detection of the current medium pressure. Since the main body 210 of the movable member 200 directly abuts against the first spring 410, and the main body 210 is provided with a side protrusion 220, the magnetic core 300 is disposed on the side protrusion 220 to move synchronously with the main body 210. This achieves mutual inductance between the electromagnetic coil 500 and the magnetic core 300 to detect the medium pressure, and even if the first spring 410 is large, the magnetic core 300 will not be damaged, thus improving the reliability of the pressure sensor 11 and making it suitable for detecting larger medium pressures. Furthermore, since the magnetic core 300 is located on the side protrusion 220, the size change of the first spring 410 will not affect the installation compatibility of the magnetic core 300. Therefore, the size of the magnetic core 300 and the electromagnetic coil 500 does not need to change accordingly to the size change of the first spring 410, thus taking into account both the size and cost of the pressure sensor 11.
[0065] Furthermore, by directly contacting the body 210 of the movable member 200 with the first spring 410, compared to the structure in the related art where the movable member contacts the spring through the magnetic core, the transmission link of the magnetic core 300 in the intermediate force transmission stage can be reduced, the force transmission distance can be reduced, thereby improving the stability and reliability of the movement of the movable member 200, and thus improving the measurement accuracy of the pressure sensor 11.
[0066] like Figure 3 As shown, according to some technical solutions of this application, optionally, the pressure sensor 11 further includes a second spring 420. One end of the second spring 420 faces the side of the magnetic core 300 opposite to the side protrusion 220, and the other end of the second spring 420 faces the housing 100. When the magnetic core 300 moves, the second spring 420 deforms in conjunction. The elastic modulus of the first spring 410 is greater than that of the second spring 420.
[0067] The elastic modulus refers to the elastic deformation stage of a spring (i.e., the stage where the spring returns to its original shape after the external force is removed). Stress (force per unit area) is directly proportional to strain (relative deformation). This proportionality constant is the elastic modulus. The elastic modulus is a physical quantity used to measure a spring's ability to resist elastic deformation when subjected to force. The elastic modulus of the first spring 410 is greater than that of the second spring 420, meaning that under the same deformation, the elastic force of the first spring 410 is greater than that of the second spring 420. In other words, under the same displacement, the elastic force exerted by the first spring 410 on the body 210 is greater than the elastic force exerted by the second spring 420 on the magnetic core 300.
[0068] In this design, a second spring 420 is placed between the housing 100 and the magnetic core 300, which improves the reset accuracy of the magnetic core 300. Since the elastic modulus of the second spring 420 is smaller than that of the first spring 410, the elastic force of the second spring 420 is smaller than that of the first spring 410 under the same displacement. This ensures that the elastic force provided by the second spring 420 is sufficient to meet the reset requirements of the magnetic core 300. Therefore, the problem of the magnetic core 300 being crushed is unlikely to occur.
[0069] Furthermore, it is understood that since the elastic modulus of the second spring 420 is relatively smaller than that of the first spring 410, it generally means that the size of the second spring 420 is also correspondingly smaller than that of the first spring 410. For example, the wire of the second spring 420 is thinner than that of the first spring 410, and / or the diameter of the second spring 420 is smaller than that of the first spring 410. By placing the magnetic core 300 on the side protrusion 220, the magnetic core 300 avoids contact with the larger first spring 410. Instead, a smaller second spring 420 is used to contact the magnetic core 300. Compared to related technologies that directly use a larger spring to contact the magnetic core 300, the smaller size of the second spring 420 results in a smaller eddy current intensity in the alternating magnetic field of the electromagnetic coil 500. Consequently, the reverse magnetic field generated by the eddy currents on the second spring 420 is weaker, and the magnetic field interference of the second spring 420 on the magnetic core 300 and the electromagnetic coil 500 is less. This reduces the signal noise of the pressure sensor 11. At the same time, the smaller size of the second spring 420 also reduces the shunting current of the magnetic flux of the second spring 420 on the electromagnetic coil 500, allowing the magnetic field generated by the electromagnetic coil 500 to be more concentrated for mutual inductance with the magnetic core 300, thereby improving the sensitivity of the pressure sensor 11.
[0070] Of course, this application is not limited to this. In other embodiments, the second spring 420 can also be omitted. For example, the magnetic core 300 can be connected and fixed to the side protrusion 220. In this way, it is not necessary to use the second spring 420 to keep the magnetic core 300 stable, thus omitting the second spring 420. The connection and fixing structure between the magnetic core 300 and the side protrusion 220 can be, for example, by directly pasting and fixing the magnetic core 300 to the side protrusion 220, or by interfering with the magnetic core 300 in the second groove 221 of the side protrusion 220 to achieve the connection and fixing between the magnetic core 300 and the side protrusion 220.
[0071] like Figure 3 As shown, according to some technical solutions of this application, optionally, the magnetic core 300 is located on the radial side of the first spring 410 (wherein, the radial direction of the first spring 410 can be understood as the perpendicular direction of the extension and contraction direction of the first spring 410, that is, the perpendicular direction of the y-direction), and there is a gap between the magnetic core 300 and the first spring 410. That is, the magnetic core 300 and the first spring 410 are not in contact. This can reduce the interference of the first spring 410 on the magnetic field of the magnetic core 300, and also reduce the interference between the magnetic core 300 and the first spring 410, thereby improving the reliability and sensitivity of the pressure sensor 11.
[0072] like Figure 3 As shown, according to some technical solutions of this application, optionally, the electromagnetic coil 500 is located on the radial side of the first spring 410, and the electromagnetic coil 500 is correspondingly arranged with the magnetic core 300. In this way, the first spring 410 will not excessively shun the magnetic flux of the electromagnetic coil 500, which can improve the detection sensitivity of the pressure sensor 11.
[0073] like Figure 6 As shown, according to some technical solutions of this application, optionally, a first groove 215 is provided on the body portion 210, and a second groove 221 is provided on the side protrusion 220. A gap exists between the first groove 215 and the second groove 221. Figure 3 It is understood that the end of the first spring 410 facing the body portion 210 is located in the first groove 215, and at least a portion of the magnetic core 300 is located in the second groove 221.
[0074] In this solution, the end of the first spring 410 facing the body 210 is placed in the first groove 215, and at least a portion of the magnetic core 300 is placed in the second groove 221. This allows for quick installation and positioning of the first spring 410 and the magnetic core 300 with the body 210, which not only improves the assembly efficiency of the product but also ensures the relative positional accuracy between the first spring 410 and the magnetic core 300, thereby reducing the magnetic field interference of the first spring 410 on the magnetic core 300 and the electromagnetic coil 500.
[0075] Optionally, based on the relative size relationship between the magnetic core 300 and the second groove 221, the magnetic core 300 and the second groove 221 can be either a clearance fit (i.e., a loose fit where the magnetic core 300 can move) or an interference fit. In the case of a clearance fit, the elastic force provided by the second spring 420 can be used to press the magnetic core 300 into the second groove 221 to achieve stability of the magnetic core 300 within the second groove 221. In the case of an interference fit, since the interference fit can essentially achieve stability of the magnetic core 300 within the second groove 221, the second spring 420 can be omitted. Of course, in the case of an interference fit, it is also possible to further abut the second spring 420 against the magnetic core 300.
[0076] Of course, this application is not limited to this. In other embodiments, the magnetic core 300 can also be directly glued to the side protrusion 220 to achieve the connection and fixation between the magnetic core 300 and the side protrusion 220. In this case, the second groove 221 may not be provided on the side protrusion 220. For example, the side protrusion 220 may be a plate without the second groove 221. Of course, it is understood that the structure of directly gluing the magnetic core 300 to the side protrusion 220 and the structure of providing the second groove 221 on the side protrusion 220 can also be combined in a non-conflicting manner. For example, the magnetic core 300 can be directly glued into the second groove 221.
[0077] Alternatively, in other embodiments, a positioning rod (not shown in the figure) can be provided on the side protrusion 220. The magnetic core can be a ring structure, located on the side protrusion 220 and nested outside the positioning rod, to achieve positioning of the magnetic core 300 on the side protrusion 220. In this case, the side protrusion 220 can have a second groove 221 to accommodate one end of the magnetic core 300; or, the side protrusion 220 may not have a second groove 221. At the same time, the elastic force provided by the second spring 420 can be used to press the magnetic core 300 against the side protrusion 220; or, the second spring 420 can be omitted, and the magnetic core 300 can be directly glued to the side protrusion 220 or to the positioning rod using glue.
[0078] like Figure 3 As shown, according to some technical solutions of this application, optionally, the housing 100 is provided with a guide hole 111, the shape of the end of the body part 210 facing away from the first spring 410 is adapted to the shape of the guide hole 111, and the end of the body part 210 facing away from the first spring 410 passes through the guide hole 111.
[0079] In this design, a guide hole 111 is provided on the housing 100. The end of the main body 210 facing away from the first spring 410 passes through the guide hole 111 and is adapted to the shape of the guide hole 111. The guide hole 111 is used to guide the displacement movement of the main body 210. This corrects the displacement direction of the main body 210 to the center line direction of the guide hole 111, avoiding the displacement direction deviation of the main body 210 due to torque caused by the gravity of the side protrusion 220 and the magnetic core 300 or the elastic force of the second spring 420, thereby improving the detection accuracy of the pressure sensor 11.
[0080] like Figure 7 and Figure 8 As shown, according to some technical solutions of this application, optionally, the body portion 210 has a first boss 211 and a side flange 212, with one end edge of the first boss 211 extending laterally to form the side flange 212, combined with... Figure 3 It is understood that the first boss 211 is inserted into the guide hole 111, and the shape of the first boss 211 is adapted to the shape of the guide hole 111. The side flange 212 is used to abut against the part around the guide hole 111 to limit the first boss 211, that is, to limit the first boss 211 axially. The side protrusion 220 is provided on the side flange 212.
[0081] In this design, the first boss 211 is inserted into the guide hole 111, and the side flange 212 is used to axially limit the first boss 211. This reduces the force on the side protrusion 220, reduces the risk of damage or deformation to the side protrusion 220, thereby improving the assembly stability and positional accuracy of the magnetic core 300, and effectively ensuring the accuracy of the pressure sensor 11.
[0082] like Figure 3 As shown, the first boss 211 protrudes in the direction opposite to the first spring 410, and the first boss 211 is recessed on the side facing the first spring 410 to form the first groove 215. In this way, the first boss 211 is a hollow structure with the first groove 215 inside. This can reduce the overall thickness of the moving part 200, which is beneficial to simplifying the overall size of the pressure sensor 11 and also to improving the smoothness of the movement of the moving part 200.
[0083] like Figure 3 As shown, according to some technical solutions of this application, optionally, the pressure sensor 11 also includes an elastic diaphragm 700. The elastic diaphragm 700 blocks one end of the guide hole 111 facing the outside of the housing 100. The medium pressure pushes the elastic diaphragm 700 from the side of the elastic diaphragm 700 facing away from the guide hole 111, causing the elastic diaphragm 700 to deform and causing the body part 210 to move along the guide hole 111.
[0084] In this solution, the elastic diaphragm 700 is used to block the end of the guide hole 111 facing the outside of the housing 100, which can reduce the entry of water vapor, foreign objects, etc. into the housing 100 along the guide hole 111, thereby improving the working environment of the first spring 410 and the magnetic core 300 and extending the life of the pressure sensor 11.
[0085] Optionally, the elastic diaphragm 700 can be made of rubber or silicone, which is low in cost, durable, and has good resilience, and can meet the requirements of repeated use.
[0086] like Figure 7 and Figure 8 As shown, according to some technical solutions of this application, optionally, a second protrusion 213 is provided at one end of the body portion 210 facing the elastic diaphragm 700, and a third groove 214 is provided on the top surface of the second protrusion 213, in conjunction with... Figure 3 It is understood that the elastic diaphragm 700 has a recess 701 at the position corresponding to the second protrusion 213, and a protrusion 702 is provided on the inner bottom surface of the recess 701. The second protrusion 213 extends into the recess 701, and the protrusion 702 extends into the third groove 214.
[0087] In this design, a recess 701 is provided on the elastic diaphragm 700. The elastic diaphragm 700 can deform towards a shape that flattens the recess 701, thereby increasing the deformability of the elastic diaphragm 700 and providing a larger displacement range for the moving part 200, thus achieving a wider pressure detection range. The protruding post 702 enhances the structural strength at the center of the elastic diaphragm 700, reduces weak points in the elastic diaphragm 700, lowers the risk of breakage, and also improves the pressure-bearing capacity of the elastic diaphragm 700.
[0088] By using the second protrusion 213 to extend into the recess 701 and the third groove 214 to accommodate the protrusion 702, the adaptability of the surface shape of the movable part 200 to the shape of the elastic diaphragm 700 can be improved, thereby improving the uniformity of pressure on the movable part 200.
[0089] Combination Figure 3 , Figure 11 and Figure 12 It is understood that the pressure sensor 11 also includes a connecting cover 800, which is connected to the housing 100. The edge of the elastic diaphragm 700 is pressed between the connecting cover 800 and the housing 100. A medium channel 801 is provided on the connecting cover 800, which corresponds to the side of the elastic diaphragm 700 opposite to the guide hole 111. In this way, the medium can be directionally transmitted to the surface of the elastic diaphragm 700 using the medium channel 801 to detect the medium pressure, making the pressure sensor 11 more convenient to use.
[0090] Combination Figure 3 and Figure 9It is understood that, according to some technical solutions of this application, optionally, a first positioning hole 121 and a second positioning hole 122 are provided in the housing 100, the end of the first spring 410 facing the housing 100 extends into the first positioning hole 121, and the end of the magnetic core 300 away from the side protrusion 220 extends into the second positioning hole 122.
[0091] In this solution, a first positioning hole 121 and a second positioning hole 122 are provided in the housing 100 to accommodate the first spring 410 and the magnetic core 300 respectively. The positioning holes can play a guiding role, thereby improving the accuracy of the deformation direction of the first spring 410 and the accuracy of the movement direction of the magnetic core 300, and improving the detection accuracy and reliability of the pressure sensor 11.
[0092] The first positioning hole 121 and the second positioning hole 122 are arranged alternately, which can increase the creepage distance between the first spring 410 and the magnetic core 300. When an induced current is generated on the first spring 410, the interference of the current of the first spring 410 on the magnetic field of the magnetic core 300 can be reduced, thereby reducing the detection noise of the pressure sensor 11.
[0093] Combination Figure 9 and Figure 10 It is understood that a guide groove 123 is also provided inside the housing 100. The extension direction of the guide groove 123 is roughly consistent with the extension and retraction direction of the first spring 410 and / or the displacement direction of the moving part 200. The side protrusion 220 and the guide groove 123 are matched one-to-one. The guide groove 123 is used to guide the movement of the side protrusion 220.
[0094] A guide groove 123 is provided on the housing 100. The guide groove 123 cooperates with the side protrusion 220 so that the side protrusion 220 can move along the guide groove 123 during the displacement movement of the main body 210. At the same time, the cooperation between the guide groove 123 and the side protrusion 220 can restrict the rotation of the moving part 200. This improves the accuracy of the relative position of the magnetic core 300 and the electromagnetic coil 500, thereby improving the detection accuracy of the pressure sensor 11.
[0095] More specifically, a side protrusion 220 may be provided on the main body 210. Two guide posts 1231 are provided on one side of the side protrusion 220 within the housing 100. The length direction of each guide post 1231 is approximately consistent with the displacement direction of the side protrusion 220. The two guide posts 1231 are provided at intervals, and the interval between the two guide posts 1231 is adapted to the width of the side protrusion 220. A guide groove 123 is formed between the two guide posts 1231.
[0096] Optionally, the side surface of the guide post 1231 is configured as an arc surface, which can reduce the frictional resistance between the side protrusion 220 and the guide post 1231.
[0097] Combination Figure 3 , Figure 5 , Figure 11 and Figure 12 It is understood that, according to some technical solutions of this application, optionally, the housing 100 includes: a first cover 110, a base 120, and a second cover 130. The first cover 110 is connected to one end of the base 120, and the first cover 110 and the base 120 together form a receiving cavity 101. The first spring 410, the movable member 200, and the magnetic core 300 are all disposed in the receiving cavity 101. The first cover 110 is provided with a guide hole 111 adapted to the main body 210. The second cover 130 is connected to one end of the base 120 opposite to the first cover 110, and the electromagnetic coil 500 is disposed between the second cover 130 and the base 120.
[0098] In this solution, by using a common base 120, the first spring 410, the movable part 200, and the magnetic core 300 are housed between the base 120 and the first cover 110, and the electromagnetic coil 500 is housed between the second cover 130 and the base 120. This not only provides protection for the first spring 410, the movable part 200, the magnetic core 300, and the electromagnetic coil 500, but also simplifies and integrates the housing 100.
[0099] Combination Figure 3 , Figure 5 and Figure 13 It is understood that, according to some technical solutions of this application, the pressure sensor 11 may optionally include a circuit board 600, which is connected to the electromagnetic coil 500. The circuit board 600 generates a corresponding detection signal and outputs it based on the electrical signal from the electromagnetic coil 500. The circuit board 600 is also positioned between the second cover 130 and the base 120, which helps protect the circuit board 600 and facilitates the wiring connection and protection between the circuit board 600 and the electromagnetic coil 500.
[0100] like Figure 3 As shown, according to some technical solutions of this application, optionally, the base 120 is provided with a connecting hole 124, the second cover 130 is provided with a connecting post 131, a through hollow region 133 is formed in the connecting post 131, a snap-fit part 132 is provided on the connecting post 131, the connecting post 131 passes through the connecting hole 124 and is snapped with the connecting hole 124 through the snap-fit part 132, and the receiving cavity 101 communicates with the outside through the hollow region 133.
[0101] In this scheme, the second cover 130 is snapped into the seat 120 by the connecting post 131, and the connecting post 131 is provided with a hollow area 133. The receiving cavity 101 formed by the seat 120 and the first cover 110 is connected to the outside through the hollow area 133, so that the pressure inside the receiving cavity 101 can be depressurized to improve the accuracy of pressure detection.
[0102] Optionally, such as Figure 4 and Figure 9 As shown, a notch 134 is provided at the end of the connecting post 131 away from the second cover 130. The end of the connecting post 131 away from the second cover 130 is divided into two by the notch 134. Buckles are provided on both sides of the connecting post 131 located at the notch 134. The notch 134 can be used to improve the elasticity of the buckles, thereby reducing the damage caused by the buckling between the connecting post 131 and the connecting hole 124.
[0103] For more detailed examples, such as Figure 3 and Figure 9 As shown, the base 120 forms an open cavity, with the opening facing the first cover 110. The first cover 110 and the cavity together form a receiving cavity 101. A first positioning hole 121 and a second positioning hole 122 are recessed at the end of the cavity away from the opening. The end of the first positioning hole 121 away from the opening of the cavity has a connecting hole 124. A connecting post 131 of the second cover 130 engages with the connecting hole 124 and partially extends into the first positioning hole 121. One end of the first spring 410 is nested in the first positioning hole 121, and the portion of the connecting post 131 extending into the first positioning hole 121 is nested within the first spring 410. The first spring 410 provides better positioning and does not obstruct the hollow area 133 within the connecting post 131. Thus, the receiving cavity 101 formed by the first cover 110 and the base 120 communicates with the hollow area 133 through the first positioning hole 121. Figure 3 As shown, on the side of the base 120 facing the second cover 130, the base 120 is provided with a mounting groove 125 surrounding the outer periphery of the second positioning hole 122. The mounting groove 125 is an annular groove, and the electromagnetic coil 500 is nested in the mounting groove 125, thereby correspondingly nesting in the outer periphery of the second positioning hole 122. The magnetic core 300 extends into the second positioning hole 122, thus extending into the electromagnetic coil 500. The second positioning hole 122 is a blind hole communicating with the cavity. The end of the second positioning hole 122 away from the cavity is closed. The circuit board 600 is located on the end face of the end of the second positioning hole 122 away from the cavity, resulting in a more compact component layout, which helps to reduce the size of the pressure sensor 11. The second spring 420 is also provided in the second positioning hole 122, and the extension and retraction movement of the second spring 420 can be guided by the second positioning hole 122.
[0104] like Figure 2 , Figure 5 , Figure 11 and Figure 12As shown, the end of the base 120 near the first cover 110, the first cover 110, and the end of the connecting cover 800 near the first cover 110 all have flange edges. The flange edges of the base 120, the first cover 110, and the connecting cover 800 are all provided with through holes. The flange edge of the first cover 110 is sandwiched between the flange edge of the base 120 and the flange edge of the connecting cover 800. The pressure sensor 11 also includes a connector 900, which passes through the through holes on the flange edges of the base 120, the first cover 110, and the connecting cover 800, thereby connecting and fixing the base 120, the first cover 110, and the connecting cover 800 together, while also clamping the edge of the elastic diaphragm 700 between the first cover 110 and the connecting cover 800.
[0105] The number of connectors 900 can be four. By using four connectors 900 to evenly fix the base 120, the first cover 110 and the connecting cover 800 in the circumferential direction, the structural reliability of the housing 100 can be improved.
[0106] Optionally, connector 900 may specifically be as follows: Figure 11 The rivet shown.
[0107] Of course, this application is not limited to this. In other embodiments, the connector 900 may also be a combination of screws and nuts; or, in other embodiments, the connector 900 may also be a metal edging provided around the housing 100, with the axial ends of the metal edging being provided as flanges. The two flanges fasten onto the flange of the first cover 110 and the flange of the connecting cover 800, so that the flanges at the axial ends of the metal edging clamp the flange of the seat 120, the flange of the first cover 110, and the flange of the connecting cover 800. In this case, the through hole on the flange can be omitted.
[0108] The second aspect of this application provides an electrical device including the pressure sensor 11 described in any of the above-mentioned technical solutions.
[0109] In this embodiment, the electrical equipment has all the above-mentioned beneficial effects because it is equipped with the pressure sensor 11 in any of the above technical solutions, which will not be described in detail here.
[0110] like Figure 14As shown, taking a coffee machine 10 as an example, the coffee machine 10 also includes a water tank 12, a pressure boosting device 13, a heating device 14, pipes 15, a brewing head 16, a control board 17, and a T-connector 18. The pressure boosting device 13 is connected between the water tank 12 and the heating device 14, which can also be called a boiler. The heating device 14 is connected to one port of the T-connector 18 via pipe 15. The brewing head 16 is connected to one port of the T-connector 18, and the pressure sensor 11 is connected to one port of the T-connector 18. Specifically, the medium channel 801 of the pressure sensor 11 is connected to one port of the T-connector 18. The pressure sensor 11, the pressure boosting device 13, and the brewing head 16 are all electrically connected to the control board 17. The pressure sensor 11 detects the pipe pressure and feeds the detection data back to the control board 17. The control board 17 controls the pressure boosting device 13 to increase or decrease pressure based on the detection data from the pressure sensor 11. When the pressure sensor 11 detects that the pipeline pressure has reached a certain threshold, which is generally 9 bar (bar is a unit of pressure: bar, 1 bar equals 100 kPa), the control board 17 starts the brewing head 16 to brew coffee.
[0111] Of course, this application is not limited to this. In other embodiments, the electrical equipment may also be a steam oven, a refrigerator, a steam mop, an electric cleaning water gun, etc.
[0112] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0113] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.
Claims
1. A pressure sensor, characterized in that, include: case; The movable part has a body portion for displacement movement driven by medium pressure, and the body portion is provided with a side protrusion protruding to the side of the body portion. The magnetic core is disposed on the side protrusion and moves synchronously with the main body. A first spring, one end of which faces the main body and the other end of which faces the housing, deforms in conjunction with the main body when it moves under the pressure of the medium. An electromagnetic coil is disposed in the housing and is used for mutual inductance with the magnetic core.
2. The pressure sensor according to claim 1, characterized in that, Also includes: The second spring has one end facing the side of the magnetic core opposite to the side protrusion, and the other end facing the housing. When the magnetic core moves, the second spring deforms accordingly. The elastic modulus of the first spring is greater than that of the second spring.
3. The pressure sensor according to claim 1 or 2, characterized in that, The magnetic core is located on the radial side of the first spring, and there is a gap between the magnetic core and the first spring; The electromagnetic coil is located on the radial side of the first spring, and the electromagnetic coil is arranged correspondingly to the magnetic core.
4. The pressure sensor according to claim 1 or 2, characterized in that, The main body is provided with a first groove, and the end of the first spring facing the main body is located in the first groove; A second groove is provided on the side protrusion, and there is a gap between the first groove and the second groove. At least a portion of the magnetic core is located in the second groove; and / or the magnetic core is bonded to the side protrusion; and / or a positioning rod is provided on the side protrusion, the magnetic core has a ring structure, and the magnetic core is located on the side protrusion and nested outside the positioning rod.
5. The pressure sensor according to claim 1 or 2, characterized in that, The housing is provided with a guide hole, and the shape of the end of the main body facing away from the first spring is adapted to the shape of the guide hole. The end of the main body facing away from the first spring passes through the guide hole.
6. The pressure sensor according to claim 5, characterized in that, The main body has a first boss and a side flange. One edge of the first boss extends to the side to form the side flange. The first boss passes through the guide hole. The shape of the first boss is adapted to the shape of the guide hole. The side flange is used to abut against the part around the guide hole to limit the first boss. The side protrusion is provided on the side flange.
7. The pressure sensor according to claim 5, characterized in that, Also includes: An elastic diaphragm is positioned to block the guide hole at one end facing the outside of the housing. The medium pressure pushes the elastic diaphragm from the side facing away from the guide hole, causing the elastic diaphragm to deform and the body to move along the guide hole.
8. The pressure sensor according to claim 7, characterized in that, The main body has a second protrusion at one end facing the elastic diaphragm, and a third groove on the top surface of the second protrusion. The elastic diaphragm has a recess corresponding to the position of the second protrusion, and a protruding post is provided on the inner bottom surface of the recess. The second protrusion extends into the recess, and the protruding post extends into the third groove; and / or The pressure sensor also includes a connecting cover, which is connected to the housing. The edge of the elastic diaphragm is pressed between the connecting cover and the housing. The connecting cover is provided with a medium channel, which corresponds to the side of the elastic diaphragm that is away from the guide hole.
9. The pressure sensor according to claim 1 or 2, characterized in that, The housing is provided with a first positioning hole and a second positioning hole. The first spring extends into the first positioning hole at one end facing the housing, and the magnetic core extends into the second positioning hole at one end away from the side protrusion.
10. The pressure sensor according to claim 9, characterized in that, The first positioning hole and the second positioning hole are provided at intervals; and / or The housing is also provided with guide grooves, and the side protrusions are matched with the guide grooves one by one.
11. The pressure sensor according to claim 1 or 2, characterized in that, The housing includes: First cover; The base has a first cover connected to one end of the base. The first cover and the base together form a receiving cavity. The first spring, the movable part and the magnetic core are all disposed in the receiving cavity. The first cover is provided with a guide hole that adapts to the main body. The second cover is connected to the end of the base opposite to the first cover, and the electromagnetic coil is disposed between the second cover and the base.
12. The pressure sensor according to claim 11, characterized in that, The base is provided with a connecting hole, and the second cover is provided with a connecting post. A through hollow area is formed inside the connecting post. A snap-fit part is provided on the connecting post. The connecting post passes through the connecting hole and is snapped into the connecting hole through the snap-fit part. The receiving cavity communicates with the outside through the hollow area.
13. An electrical appliance, characterized in that, Includes the pressure sensor as described in any one of claims 1 to 12.