Sensor and washing machine formed by same

Abstract

The utility model provides a sensor and a washing machine formed thereof.The sensor comprises a shell, an air film located in the shell, an air inlet assembly located on one side of the air film and an electrical assembly located on the other side of the air film, the air inlet assembly comprises an air cover, a plunger and a fastener, the plunger plays a role in supporting and limiting the air film, and the fastener is connected with the air cover. The air cylinder is slidably clamped with the air film; an air inlet is formed in the air cover, and the plunger and the air cover are fixed by the fastener; the air inlet pressure of the air inlet enables the air film to slide relative to the plunger, and the detection value in the electrical assembly corresponds to the position of the air film. The plunger and the air cover are fixed together, collision abnormal sound caused by movement of the plunger in the operation process is avoided, and then the operation stability and the measurement precision of the sensor are improved.

Description

Technical Field

[0001] The utility model relates to the field of structural design of a liquid level sensor, in particular to a sensor and a washing machine formed by the sensor. Background Art

[0002] With the development of washing machines, the requirements for performance control of electrical components are getting higher and higher. The performance of electrical components is the key point of quality control. During the experimental testing of the whole machine, electrical components such as liquid level sensors have the largest abnormal noise ratio, which poses a great quality risk.

[0003] In order to effectively solve the abnormal problem of the liquid level sensor for washing machines, the existing technology has analyzed its structure and found that the internal plunger of the liquid level sensor for washing machines is a separate movable part inside the sensor. Therefore, during the full-load high-speed dehydration process, the plunger moves inside the sensor, thereby producing a collision sound between plastic parts.

[0004] There are two significant problems with the liquid level sensor in the prior art: 1. During the whole machine experimental test, the internal plunger of the liquid level sensor for washing machines is a separate movable part inside the sensor. Therefore, during the full-load high-speed dehydration process of the washing machine, the plunger moves inside the sensor, thereby generating a collision noise between the plastic parts;

[0005] 2. Due to the internal structure of the liquid level sensor, the operation of the washing machine is unstable and there is a risk of failure during user use, which affects the user experience. Utility Model Content

[0006] In order to overcome the problems existing in the related art, one of the purposes of the utility model is to provide a sensor that fixes the plunger and the air cover together to avoid collision and abnormal noise caused by the activity of the plunger during operation, thereby improving the operating stability and measurement accuracy of the sensor.

[0007] A sensor comprises a housing, an air membrane located inside the housing, an air intake assembly located on one side of the air membrane, and an electrical assembly located on the other side of the air membrane, wherein the air intake assembly comprises an air cover, a plunger, and a fastener, wherein the plunger is slidably engaged with the air membrane; an air inlet is provided in the air cover, and the fastener fixes the plunger and the air cover;

[0008] The air pressure of the air inlet causes the air film to slide relative to the plunger, and the detection value in the electrical component is in a corresponding relationship with the position of the air film.

[0009] In the present application, the pressure at the air inlet enters the air film position through the air inlet component. Since the air film and the plunger are slidably connected, that is, the plunger fixes and limits the air film, and the plunger is fixed relative to the air cover, the air film slides relative to the plunger and the air cover under the action of the intake pressure; when the intake pressure is large, the air film moves to a position relatively far away from the air cover, and when the intake pressure is small, the air film moves to a position relatively close to the air cover; when the position of the air film is different, the displacement of the air inlet component abutting the air film also undergoes a displacement of corresponding scale, so that the detection value in the electrical component and the position of the air film present a corresponding relationship; in this way, the intake pressure of the air inlet can be inferred by observing the detection value of the electrical component. The above-mentioned structural design of the present application can ensure that during the operation of the sensor, the plunger is fixed relative to the air cover, and only the air film slides, thereby avoiding the collision and abnormal noise caused by the plunger activity in the prior art, thereby improving the operating stability and measurement accuracy of the sensor.

[0010] In a preferred technical solution of the utility model, the air cover is an annular structure, and an air inlet is arranged at the center of the air cover; the plunger is an annular structure, and the plunger is located at the top of the air cover, a first through hole is arranged at the center of the plunger, and a second through hole adapted to the first through hole is arranged at the center of the air cover, and the fastener is located in both the first through hole and the second through hole.

[0011] The first through hole and the second through hole can be understood as limit through holes for accommodating fasteners. When the fasteners are located inside the first through hole and the second through hole at the same time, the plunger where the first through hole is located and the gas cover where the second through hole is located can also be fixed together to prevent the plunger and the gas cover from sliding relative to each other, and to prevent the plunger from being affected by the intake pressure during the operation of the sensor, causing expansion noise. The present application uses a fastener that penetrates both the plunger and the gas cover as a fixing structure for the two. The fixing structure is simple and will not affect the normal intake of the air inlet.

[0012] In a preferred technical solution of the utility model, the fastener is a fastening screw, and the first through hole and the second through hole are provided with internal threads adapted to the fastening screw.

[0013] By adapting and fixing the internal thread to the external thread on the fastening screw, it is only necessary to ensure that the external thread of the fastening screw is connected to the first through hole and the second through hole at the same time to ensure that the plunger and the air cover are fixed together. The structure is simple, the changes to the plunger and the air cover are small, and it will not affect the normal air intake of the air inlet.

[0014] In a preferred technical solution of the utility model, the air cover includes a first annular portion and a second annular portion, the second annular portion is located at the top end of the first annular portion; a groove for accommodating a plunger is provided in the second annular portion, the cross-sectional area of ​​the second annular portion is larger than the cross-sectional area of ​​the first annular portion, and a second through hole is provided in the first annular portion.

[0015] The structural design of the air cap in the present application ensures that the air cap and the shell are adapted and sealed to form a storage space for accommodating electrical components and the air membrane; at the same time, the outer side of the second annular portion in the air cap is used for sealing connection with the shell, and the inner side of the second annular portion is used for installing and placing the plunger; an air inlet is arranged in the first annular portion; without changing the original shape of the air cap, it is ensured that the air cap can be fixedly connected to the shell and the plunger at the same time.

[0016] In a preferred technical solution of the utility model, the plunger includes an outer ring plate, an inner ring column and a first baffle, a first baffle perpendicular to the outer ring plate is arranged in the middle of the outer ring plate, an inner ring column is arranged on the side of the first baffle close to the second annular portion, and the axial centerline of the inner ring column, the outer ring plate and the first baffle coincides with the axial centerline of the first annular portion; a second through hole is arranged in the inner ring column, and an air intake through hole is arranged in the center of the first baffle.

[0017] The plunger structure in the present application is simple, and the double-layer structure design of the inner ring column and the outer ring plate ensures that the inner ring column is fixed to the air cover through fasteners, and the outer ring plate is used to limit and lift the air film. At the same time, an air intake hole is set in the first baffle to ensure that the air pressure at the air inlet is transmitted to the air film position through the second through hole, the first through hole and the air intake through hole in sequence.

[0018] In a preferred technical solution of the utility model, the air inlet is communicated with the first through hole, the second through hole and the air inlet through hole.

[0019] The second through hole can be a through hole structure that penetrates the first annular portion, and the second through hole and the first through hole are provided with internal threads. When the fastening screw is installed inside the first through hole and the second through hole, the threaded connection between the first through hole, the second through hole and the fastening screw can also serve as an air intake passage, that is, the air pressure at the air intake port is transmitted along the internal threads of the second through hole and the first through hole to the air intake through hole of the first baffle, and then transmitted to the air film position through the space above the first baffle. The present application uses the connecting passage as the air intake passage at the same time, which simplifies the structural design of the air intake assembly.

[0020] In a preferred technical solution of the utility model, the electrical component includes a magnet and an LC oscillation circuit, and the magnet and the LC oscillation circuit do not completely overlap; the magnet is located on the side of the air film away from the air intake component, and the magnet is in contact with the air film; the movement of the air film drives the movement of the magnet; the position of the magnet changes, so that the inductance of the LC oscillation circuit changes.

[0021] In a preferred technical solution of the utility model, the LC oscillation circuit includes an electrically connected coil and a capacitor, the magnetic conductor is located inside the coil, and the axis of the magnetic conductor coincides with the axis of the coil.

[0022] In a preferred technical solution of the utility model, the electrical component further includes a shaping circuit and a microprocessor, and the output end of the LC oscillation circuit is connected to the microprocessor via the shaping circuit.

[0023] The present application designs the connection relationship between the magnetic conductor and the air film to ensure that the two change positions synchronously with the size of the air pressure at the air inlet, and designs the connection relationship between the magnetic conductor and the coil to ensure that the displacement of the magnetic conductor affects the inductance value in the LC oscillation circuit, thereby making the electrical component output a signal corresponding to the air pressure at the air inlet, so that the air pressure at the air inlet can be determined only based on the output signal of the microprocessor. The electrical component has a simple structure and a clever design, and can accurately measure the size of the air pressure at the air inlet.

[0024] The second object of the present utility model is to provide a washing machine, comprising a sensor as described above, wherein the air inlet of the sensor is connected to the bottom of a water tank of the washing machine.

[0025] When the liquid level in the water tank is different, the pressure at the bottom of the water tank is different; the structural design of the present application can directly eliminate the resonance problem between the liquid level sensor and the vibration during the operation of the washing machine, and can effectively solve the resonance noise caused by the shaking of the plunger.

[0026] The beneficial effects of the utility model are:

[0027] The utility model provides a sensor, comprising a shell, an air film located inside the shell, an air intake component located on one side of the air film, and an electrical component located on the other side of the air film, wherein the air intake component comprises an air cover, a plunger and a fastener, and the plunger is slidably engaged with the air film; an air inlet is provided in the air cover, and the fastener fixes the plunger and the air cover; the air intake pressure of the air inlet causes the air film to slide relative to the plunger, and the detection value in the electrical component is in a corresponding relationship with the position of the air film. In the present application, the pressure at the air inlet enters the position of the air film through the air inlet assembly. Since the air film and the plunger are slidably connected, that is, the plunger fixes and limits the air film, and the plunger is fixed relative to the air cover, the air film slides relative to the plunger and the air cover under the action of the air inlet pressure; when the air inlet pressure is large, the air film moves to a position relatively far from the air cover, and when the air inlet pressure is small, the air film moves to a position relatively close to the air cover; when the position of the air film is different, the displacement of the air inlet assembly abutting against the air film also undergoes a displacement of a corresponding scale, thereby making the detection value in the electrical assembly and the position of the air film present a corresponding relationship; in this way, the air inlet pressure of the air inlet can be inferred by observing the detection value of the electrical assembly, and when the air inlet pressure is a pressure related to the liquid level, the sensor is specifically a liquid level sensor. The above-mentioned structural design of the present application can ensure that during the operation of the sensor, the plunger is fixed relative to the air cover, and only the air film slides, avoiding the collision noise caused by the plunger activity in the prior art, thereby improving the operating stability and measurement accuracy of the sensor.

[0028] The utility model also provides a washing machine including the above-mentioned sensor, wherein the air inlet of the sensor is connected to the bottom of the water tank of the washing machine; when the liquid level in the water tank is different, the pressure at the bottom of the water tank is different; the structural design of the present application can directly eliminate the resonance problem between the liquid level sensor and the vibration caused during the operation of the washing machine, and can effectively solve the resonance noise caused by the shaking of the plunger. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is the overall structural diagram of the sensor;

[0030] Figure 2 is a cross-sectional schematic diagram of the sensor;

[0031] Figure 3 It is a partial enlarged view of the plunger in the sensor;

[0032] Figure 4 This is a partial enlarged view of the gas cover in the sensor;

[0033] Figure 5 Schematic diagram of the internal structure of the sensor;

[0034] Figure 6 A connection diagram for electrical components;

[0035] Figure 7 Schematic diagram of sensor application scenarios.

[0036] Reference numerals:

[0037] 8. Magnetic conductor; 9. Air film; 10. Plunger; 101. Outer ring plate; 102. Inner ring column; 103. First baffle; 11. Air cover; 111. First annular portion; 112. Second annular portion; 113. Second through hole; 114. Groove; 12. Air inlet; 13. Fastening screw; 14. Coil; 15. Capacitor; 16. Shaping circuit; 17. Microprocessor; 18. Water tank; 20. Housing. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0039] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0040] It should be understood that although the terms "first", "second", "third", etc. may be used to describe various information in the present invention, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0041] Example 1

[0042] like Figure 1-Figure 6 As shown, the sensor provided in this embodiment includes a shell 20, an air film 9 located inside the shell 20, an air intake component located on one side of the air film 9 and an electrical component located on the other side of the air film 9, the air intake component includes an air cover 11, a plunger 10 and a fastener, the plunger 10 supports and limits the air film, and is slidably engaged with the air film 9; an air inlet 12 is provided in the air cover 11, and the fastener fixes the plunger 10 and the air cover; the air intake pressure of the air inlet 12 causes the air film 9 to slide relative to the plunger 10, and the detection value in the electrical component corresponds to the position of the air film 9.

[0043] In the present application, when the intake pressure is a pressure related to the liquid level, the sensor is specifically a liquid level sensor, which can be specifically applied to an integral device related to the liquid level, such as a washing machine. When the intake pressure is other pressures, the sensor of the present application can also be used as a pressure sensor.

[0044] In the present application, the pressure at the air inlet 12 enters the position of the air film 9 through the air inlet assembly. Since the air film 9 and the plunger 10 are slidably connected, that is, the plunger 10 fixes the air film 9 and the plunger 10 is fixed relative to the air cover 11, the air film 9 slides relative to the plunger 10 and the air cover 11 under the action of the air inlet pressure; when the air inlet pressure is large, the air film 9 moves to a position relatively far away from the air cover 11, and when the air inlet pressure is small, the air film 9 moves to a position relatively close to the air cover 11; when the positions of the air film 9 are different, The displacement of the air intake component that abuts the air film 9 also undergoes a displacement of corresponding scale, so that the detection value in the electrical component and the position of the air film 9 show a corresponding relationship; in this way, the intake pressure of the air inlet 12 can be inferred by observing the detection value of the electrical component. The above-mentioned structural design of the present application can ensure that during the operation of the sensor, the plunger 10 is fixed relative to the air cover 11, and only the air film 9 slides, thereby avoiding the collision and abnormal noise caused by the movement of the plunger 10 in the prior art, thereby improving the operating stability and measurement accuracy of the sensor.

[0045] Example 2

[0046] like Figure 1-Figure 6 As shown, the sensor provided in this embodiment includes a shell 20, an air film 9 located inside the shell 20, an air intake component located on one side of the air film 9 and an electrical component located on the other side of the air film 9, the air intake component includes an air cover 11, a plunger 10 and a fastener, the plunger 10 supports and limits the air film, and is slidably engaged with the air film 9; an air inlet 12 is provided in the air cover 11, and the fastener fixes the plunger 10 and the air cover; the air intake pressure of the air inlet 12 causes the air film 9 to slide relative to the plunger 10, and the detection value in the electrical component corresponds to the position of the air film 9.

[0047] Furthermore, in the present application, the gas cover 11 is an annular structure, and an air inlet 12 is arranged at the center of the gas cover 11; the plunger 10 is an annular structure, and the plunger 10 is located at the top of the gas cover 11, and a first through hole is arranged at the center of the plunger 10 (coinciding with the position of the fastening screw, not marked in the drawings), and a second through hole 113 adapted to the first through hole is arranged at the center of the gas cover 11, and the fastener is located in both the first through hole and the second through hole 113.

[0048] The first through hole and the second through hole 113 can be understood as limit through holes for accommodating fasteners. When the fasteners are located inside the first through hole and the second through hole 113 at the same time, the plunger 10 where the first through hole is located and the gas cover 11 where the second through hole 113 is located can also be fixed together to prevent the plunger 10 and the gas cover 11 from sliding relative to each other, and to prevent the plunger 10 from being affected by the intake pressure during the operation of the sensor, causing expansion noise. The present application uses a fastener that penetrates both the plunger 10 and the gas cover 11 as a fixing structure for the two. The fixing structure is simple and will not affect the normal intake of the air inlet 12.

[0049] Specifically, the fastener in the present application is a fastening screw 13 , and the first through hole and the second through hole 113 are provided with internal threads adapted to the fastening screw 13 .

[0050] By adapting and fixing the internal thread to the external thread on the fastening screw 13, it is only necessary to ensure that the external thread of the fastening screw 13 is simultaneously connected to the first through hole and the second through hole 113 to ensure that the plunger 10 and the air cover 11 are fixed together. The structure is simple, the changes to the plunger 10 and the air cover 11 are small, and the normal air intake of the air inlet 12 will not be affected.

[0051] like Figure 4 As shown, the gas cover 11 includes a first annular portion 111 and a second annular portion 112, wherein the second annular portion 112 is located at the top end of the first annular portion 111; a groove 114 for accommodating the plunger 10 is provided in the second annular portion 112, the cross-sectional area of ​​the second annular portion 112 is greater than the cross-sectional area of ​​the first annular portion 111, and a second through hole 113 is provided in the first annular portion 111.

[0052] In the present application, the gas cap 11 and the housing 20 cooperate with each other to form a storage space for accommodating the electrical components and the gas membrane 9. The first annular portion 111 of the gas cap 11 is located on the side away from the housing 20, and the second annular portion 112 is located on the side close to the housing 20, and the first annular portion 111 is provided with an air inlet 12; in order to match the housing 20, the cross-sectional area of ​​the second annular portion 112 is set to be larger than the cross-sectional area of ​​the first annular portion 111. At the same time, a groove 114 for accommodating the plunger 10 is provided in the second annular portion 112; the plunger 10 is installed inside the groove 114, and a second through hole 113 adapted to the first through hole is provided in the first annular portion 111, that is, the plunger 10 and the first annular portion 111 of the gas cap 11 are fixed together by fasteners, and the second annular portion 112 is sealed with the housing 20 and is used to install and place the plunger 10. The first annular portion 111 of the gas cap 11 is also provided with an air inlet 12. The air inlet 12 is connected to the air film 9 through the first annular portion 111 , the second annular portion 112 or the plunger 10 in sequence.

[0053] The structural design of the gas cap 11 in the present application ensures that the gas cap 11 is adapted and sealed with the shell 20 to form a storage space for accommodating electrical components and the gas membrane 9; at the same time, the outer side of the second annular portion 112 in the gas cap 11 is used for sealing connection with the shell 20, and the interior of the second annular portion 112 is used for installing and placing the plunger 10; an air inlet 12 is provided in the first annular portion 111; without changing the original shape of the gas cap 11, it is ensured that the gas cap 11 can be fixedly connected to the shell 20 and the plunger 10 at the same time.

[0054] It should be noted that in the present application, the air cap 11 and the housing 20 are sealed and connected, and the sealed connection between the two can be achieved by sealing welding. This is because when the air pressure of the air inlet 12 enters the air film 9 through the air inlet 12 and the plunger 10, the air pressure channel needs to be a sealed structure to avoid leakage of air pressure at the connection position, which causes pressure transmission error.

[0055] like Figure 3 As shown, the plunger 10 includes an outer ring plate 101, an inner ring column 102 and a first baffle 103, a first baffle 103 perpendicular to the outer ring plate 101 is arranged in the middle of the outer ring plate 101, an inner ring column 102 is arranged on the side of the first baffle 103 close to the second annular portion 112, and the axial center lines of the inner ring column 102, the outer ring plate 101 and the first baffle 103 coincide with the axial center line of the first annular portion 111; a second through hole 113 is arranged in the inner ring column 102, and an air intake through hole is arranged at the center of the first baffle 103.

[0056] The bottom of the groove 114 disposed in the second annular portion 112 is located at the junction of the first annular portion 111 and the second annular portion 112. Figure 4 As shown, it can be seen that the bottom center of the groove 114 is the second through hole 113, so the outer ring plate 101 of the plunger 10 is placed at the edge of the groove 114. The outer ring plate 101 can be a ring structure, and the outer diameter of the outer ring plate 101 is slightly smaller than the inner diameter of the groove 114, and the difference between the two is not large. Figure 3 As shown, when the outer ring plate 101 is a vertically extending annular structure, the first baffle 103 is a horizontal plate, and the first baffle 103 is located in the middle of the outer ring plate 101. An air intake hole is provided in the center of the first baffle 103 to ensure that the air pressure of the air inlet 12 can be transmitted to the position of the air film 9 through the air intake. The inner ring column 102 is located on the side of the first baffle 103 close to the air inlet 12, and a first through hole is provided in the inner ring. The inner diameters of the first through hole and the second through hole 113 are the same, and both are provided with internal threads. Therefore, the inner ring column 102 is also an annular structure, and the inner diameter of the inner ring column 102 is equal to the inner diameter of the second through hole 113. The outer diameter of the inner ring column 102 is larger than the inner diameter of the second through hole 113 and smaller than the inner diameter of the groove 114, so that it can be ensured that the bottom of the inner ring column 102 is also installed and placed at the bottom of the groove 114.

[0057] The plunger 10 in the present application has a simple structure, and the double-layer structure design of the inner ring column 102 and the outer ring plate 101 ensures that the inner ring column 102 is fixed to the air cover 11 through fasteners, and the outer ring plate 101 is used to limit and lift the air film 9. At the same time, an air intake hole is set in the first baffle 103 to ensure that the air pressure of the air inlet 12 is transmitted to the position of the air film 9 through the second through hole 113, the first through hole and the air intake through hole in sequence.

[0058] In order to ensure smooth transmission of air pressure in a relatively sealed space, the air inlet 12 in the present application is connected to the first through hole, the second through hole 113 and the air inlet through hole.

[0059] Specifically, the second through hole 113 can be a through hole structure that passes through the first annular portion 111, and the second through hole 113 and the first through hole are provided with internal threads. When the fastening screw 13 is installed in the first through hole and the second through hole 113, the threaded connection between the first through hole, the second through hole 113 and the fastening screw 13 can also be used as an air intake passage, that is, the air pressure of the air inlet 12 is transmitted along the internal threads of the second through hole 113 and the internal threads of the first through hole to the air intake through hole of the first baffle 103, and then transmitted to the position of the air film 9 through the space above the first baffle 103. The present application uses the connecting passage as the air intake passage at the same time, which simplifies the structural design of the air intake component.

[0060] Example 3

[0061] like Figure 1-Figure 6 As shown, the sensor provided in this embodiment includes a shell 20, an air film 9 located inside the shell 20, an air intake component located on one side of the air film 9, and an electrical component located on the other side of the air film 9, the air intake component includes an air cover 11, a plunger 10 and a fastener, the plunger 10 is slidably engaged with the air film 9; an air inlet 12 is provided in the air cover 11, and the fastener fixes the plunger 10 and the air cover; the air intake pressure of the air inlet 12 causes the air film 9 to slide relative to the plunger 10, and the detection value in the electrical component corresponds to the position of the air film 9.

[0062] In the present application, the gas cap 11 is an annular structure, and an air inlet 12 is arranged at the center of the gas cap 11; the plunger 10 is an annular structure, and the plunger 10 is located at the top of the gas cap 11, and a first through hole is arranged at the center of the plunger 10, and a second through hole 113 adapted to the first through hole is arranged at the center of the gas cap 11, and the fastener is located in the first through hole and the second through hole 113 at the same time.

[0063] Specifically, the air cover 11 includes a first annular portion 111 and a second annular portion 112, wherein the second annular portion 112 is located at the top of the first annular portion 111; a groove 114 for accommodating the plunger 10 is provided in the second annular portion 112, and the cross-sectional area of ​​the second annular portion 112 is greater than the cross-sectional area of ​​the first annular portion 111, and a second through hole 113 is provided in the first annular portion 111. The air cover 11 and the housing 20 are sealed, and the sealed connection between the two can be achieved by sealing welding. This is because when the air pressure of the air inlet 12 enters the position of the air film 9 through the air inlet 12 and the plunger 10, the air pressure channel needs to be a sealed structure to avoid leakage of air pressure at the connection position, which causes pressure transmission errors.

[0064] Specifically, the plunger 10 includes an outer ring plate 101, an inner ring column 102 and a first baffle 103. A first baffle 103 perpendicular to the outer ring plate 101 is arranged in the middle of the outer ring plate 101. The inner ring column 102 is arranged on the side of the first baffle 103 close to the second annular portion 112. The axial center lines of the inner ring column 102, the outer ring plate 101 and the first baffle 103 coincide with the axial center line of the first annular portion 111; a second through hole 113 is arranged in the inner ring column 102, and an air intake through hole is arranged at the center of the first baffle 103.

[0065] Specifically, Figure 6 As shown, the electrical component includes a magnetizer 8 and an LC oscillating circuit, and the LC oscillating circuit includes an electrically connected coil 14 and a capacitor 15. The magnetizer 8 is located inside the coil 14, and the axis of the magnetizer 8 coincides with the axis of the coil 14. The magnetizer 8 is located on the side of the air film 9 away from the air intake component, and the magnetizer 8 abuts against the air film 9; the movement of the air film 9 drives the magnetizer 8 to move; the position of the magnetizer 8 changes, so that the inductance of the LC oscillating circuit changes.

[0066] The coil 14 and the capacitor 15 together form an LC oscillation circuit, generating an oscillation frequency, which is:

[0067] Here, L refers to the inductance value of the coil 14 , and C refers to the capacitance value of the capacitor 15 .

[0068] The electrical assembly further comprises a shaping circuit 16 and a microprocessor 17 , wherein the output end of the LC oscillation circuit is connected to the microprocessor 17 via the shaping circuit 16 .

[0069] When the air pressure of the air inlet 12 is different, the pressure on the air film 9 is different. When the pressure on the air film 9 is relatively large, the air film 9 will move in the direction away from the air inlet 12, driving the magnetic conductor 8 to move toward the inside of the coil 14, that is, the overlapping area of ​​the magnetic conductor 8 and the coil 14 increases, making the inductance of the LC oscillation circuit larger, and then increasing the natural frequency of the LC oscillation circuit. The natural frequency is formed into equal-amplitude pulses through the shaping circuit 16 and sent to the microprocessor 17. After processing, a larger voltage value related to the air pressure is output. When the pressure on the air film 9 is relatively small, the air film 9 is located at a position relatively close to the air inlet 12. At this time, the overlapping area of ​​the magnetic conductor 8 and the coil 14 is small, making the inductance of the LC oscillation circuit smaller, and then reducing the natural frequency of the LC oscillation circuit. The natural frequency is formed into equal-amplitude pulses through the shaping circuit 16 and sent to the microprocessor 17. After processing, a smaller voltage value related to the air pressure is output.

[0070] The present application designs the connection relationship between the magnetic conductor 8 and the air film 9 to ensure that the two change positions synchronously with the air pressure at the air inlet 12, and designs the connection relationship between the magnetic conductor 8 and the coil 14 to ensure that the displacement of the magnetic conductor 8 affects the inductance value in the LC oscillation circuit, thereby making the electrical component output a signal corresponding to the air pressure at the air inlet 12, so that the air pressure at the air inlet 12 can be determined only based on the output signal of the microprocessor 17. The electrical component has a simple structure and a clever design, and can accurately measure the air pressure at the air inlet 12.

[0071] Example 4

[0072] like Figure 7 As shown, a washing machine provided by the present application includes the sensor in Example 2 or Example 3, and the air inlet 12 of the sensor is connected to the bottom of the water tank 18 of the washing machine.

[0073] When the liquid level in the water tank 18 is high, the pressure at the bottom of the water tank 18 is relatively high, that is, the air intake pressure is relatively high, and the air film 9 will move away from the air inlet 12, driving the magnetic body 8 to move toward the inside of the coil 14, that is, the overlapping area between the magnetic body 8 and the coil 14 increases, thereby increasing the inductance of the LC oscillation circuit, and further increasing the natural frequency of the LC oscillation circuit. The natural frequency is formed into equal-amplitude pulses through the shaping circuit 16 and sent to the microprocessor 17, which outputs a larger voltage value related to the air pressure after processing.

[0074] When the liquid level in the water tank 18 is low, the pressure at the bottom of the water tank 18 is low, that is, the intake pressure is low, and the air film 9 is located relatively close to the intake port 12. At this time, the overlap area of ​​the magnetic conductor 8 and the coil 14 is small, which makes the inductance of the LC oscillation circuit smaller, thereby reducing the natural frequency of the LC oscillation circuit. The natural frequency is formed into equal-amplitude pulses through the shaping circuit 16 and sent to the microprocessor 17. After processing, a small voltage value related to the air pressure is output. Through the above structure, the output value of the electrical component can be proportional to the intake pressure.

[0075] The air inlet 12 of the sensor is connected to the bottom of the water tank 18 of the washing machine; when the liquid level in the water tank 18 is different, the pressure at the bottom of the water tank 18 is different; the structural design of the present application can directly eliminate the resonance problem between the liquid level sensor and the vibration caused during the operation of the washing machine, and can effectively solve the resonance noise caused by the shaking of the plunger 10.

[0076] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings. In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0077] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0078] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0079] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A sensor, characterized in that: The invention comprises a housing (20), an air membrane (9) located inside the housing (20), an air intake assembly located on one side of the air membrane (9), and an electrical assembly located on the other side of the air membrane (9); the air intake assembly comprises an air cover (11), a plunger (10), and a fastener; the plunger (10) supports and limits the air membrane (9) and is slidably engaged with the air membrane (9); an air inlet (12) is provided in the air cover (11), and the fastener fixes the plunger (10) and the air cover (11); The air pressure of the air inlet (12) causes the air film (9) to slide relative to the plunger (10), and the detection value in the electrical component is in a corresponding relationship with the position of the air film (9).

2. A sensor according to claim 1, characterized in that: The gas cap (11) is an annular structure, and an air inlet (12) is arranged at the center of the gas cap (11); the plunger (10) is an annular structure, and the plunger (10) is located at the top of the gas cap (11), and a first through hole is arranged at the center of the plunger (10), and a second through hole (113) adapted to the first through hole is arranged at the center of the gas cap (11), and the fastener is located in both the first through hole and the second through hole (113).

3. A sensor according to claim 2, characterized in that: The fastener is a fastening screw (13), and the first through hole and the second through hole (113) are provided with internal threads matching the fastening screw (13).

4. A sensor according to claim 2, characterized in that: The gas cap (11) comprises a first annular portion (111) and a second annular portion (112), wherein the second annular portion (112) is located at the top end of the first annular portion (111); a groove (114) for accommodating the plunger (10) is provided in the second annular portion (112), the cross-sectional area of ​​the second annular portion (112) is greater than the cross-sectional area of ​​the first annular portion (111), and a second through hole (113) is provided in the first annular portion (111).

5. A sensor according to claim 4, characterized in that: The plunger (10) comprises an outer ring plate (101), an inner ring column (102) and a first baffle (103); a first baffle (103) perpendicular to the outer ring plate (101) is arranged in the middle of the outer ring plate (101); an inner ring column (102) is arranged on one side of the first baffle (103) close to the second annular portion (112); the axis of the inner ring column (102), the outer ring plate (101) and the first baffle (103) coincides with the axis of the first annular portion (111); a second through hole (113) is arranged in the inner ring column (102); and an air intake through hole is arranged at the center of the first baffle (103).

6. A sensor according to claim 5, characterized in that: The air inlet (12) is in communication with the first through hole, the second through hole (113) and the air inlet through hole.

7. A sensor according to claim 1, characterized in that: The electrical component comprises a magnetizer (8) and an LC oscillation circuit, wherein the magnetizer (8) and the LC oscillation circuit do not completely overlap; the magnetizer (8) is located on a side of the air film (9) away from the air intake component, and the magnetizer (8) is in contact with the air film (9); the movement of the air film (9) drives the movement of the magnetizer (8); the position of the magnetizer (8) changes, causing the inductance of the LC oscillation circuit to change.

8. A sensor according to claim 7, characterized in that: The LC oscillation circuit comprises an electrically connected coil (14) and a capacitor (15); the magnetic conductor (8) is located inside the coil (14), and the axis of the magnetic conductor (8) coincides with the axis of the coil (14).

9. A sensor according to claim 7, characterized in that: The electrical component further comprises a shaping circuit (16) and a microprocessor (17), and the output end of the LC oscillation circuit is connected to the microprocessor (17) through the shaping circuit (16).

10. A washing machine, comprising a sensor according to any one of claims 1 to 9, wherein an air inlet (12) of the sensor is connected to the bottom of a water tank (18) of the washing machine.

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