Breast pump and differential capacitance sensor assembly

Abstract

The invention relates to the technical field of mother and baby products, in particular to a breast pump and a differential capacitance sensor assembly. The breast pump comprises a milk storage container used for storing milk and a differential capacitive sensor assembly used for detecting state parameters of the milk storage container. The milk storage container comprises a milk storage container shell, and the milk storage container shell comprises an inner side face making contact with milk and an outer side face not making contact with the milk. The differential capacitance sensor assembly comprises a detection electrode assembly, and the detection electrode assembly is arranged on the outer side face or close to the outer side of the outer side face. The state parameters of the milk storage container are detected through the differential capacitance sensor assembly, external interference is not likely to happen, the detection accuracy of the state parameters of the milk storage container can be guaranteed, non-contact measurement is conducted on the milk storage container, and it is guaranteed that milk is clean.

Description

Technical Field

[0001] The present application relates to the technical field of maternal and infant products, and in particular to a breast pump and a differential capacitive sensor assembly. Background Art

[0002] In the prior art, the detection technology of milk volume and milk fullness of breast pumps has always been a difficult problem in the industry. Common detection sensing methods include optical, capacitive and other sensing technologies. The capacitive sensors currently used usually use inductive capacitive sensors, which are usually used to detect the liquid level of the milk storage container. The detection accuracy is relatively low, and it is easy to be disturbed by the outside world, causing the breast pump to be accidentally touched or the detection result to be greatly biased.

[0003] The inductive capacitive sensor has only one plate, which is used to detect the capacitance between the plate and the ground. It can only output high-level signals and low-level signals. The high-level signal reflects that the capacitance change is greater than the preset threshold, and it is considered that the liquid level has reached the liquid level corresponding to the inductive capacitive sensor. The low-level signal reflects that the capacitance change is less than the preset threshold, and it is considered that the liquid level has not reached the liquid level corresponding to the inductive capacitive sensor.

[0004] However, in actual applications, inductive capacitive sensors are susceptible to various interferences, such as milk sticking to the wall, differences in dielectric constants of milk from different mothers, manufacturing errors of breast pumps, human contact, etc. These will cause the inductive capacitive sensor to interfere with milk volume detection and affect the accuracy of milk volume or milk fullness detection.

[0005] For example, milk sticking to the wall of a milk storage container interferes significantly with milk volume or milk fullness detection in a breast pump. Milk sticking to the wall refers to the phenomenon that milk "sticks" to the wall of the milk storage container due to surface tension. At this time, if the milk sticking to the wall happens to be completely or partially "stuck" in the detection area of ​​the inductive capacitive sensor, it is very likely that the inductive capacitive sensor will erroneously output a high-level signal, resulting in incorrect milk volume detection.

[0006] In addition, the prior art does not have a good detection method for the milk ejection reflex or the critical state of milk discharge from an empty milk storage container to breast milk discharge, which is crucial for operations such as mode switching or automatic startup.

[0007] This application is proposed to solve any of the above technical problems. Summary of the invention

[0008] The present application provides a breast pump and a differential capacitive sensor assembly, which are intended to ensure detection accuracy when detecting status parameters of a milk storage container and to ensure that the milk is clean.

[0009] In a first aspect, the present application provides a breast pump, comprising: a milk storage container for storing milk and a differential capacitive sensor assembly for detecting a state parameter of the milk storage container; the milk storage container comprises a milk storage container shell, the milk storage container shell comprises an inner side surface contacting the milk and an outer side surface not contacting the milk; the differential capacitive sensor assembly comprises a detection electrode assembly, and the detection electrode assembly is arranged on the outer side surface or close to the outer side of the outer side surface.

[0010] In the above technical solution, on the one hand, the differential capacitive sensor assembly can quantitatively detect state parameters such as milk or liquid level, and when milk hangs on the wall, it will not have a substantial impact on the detection result, and has strong anti-interference ability. On the other hand, the differential capacitive sensor assembly can be used to detect states such as the empty cup of the milk storage container to the critical state of breast milk discharge, thereby optimizing the user experience of the breast pump. On the other hand, the milk storage container is non-contact measured to ensure the cleanliness of the milk.

[0011] In a possible implementation manner of the first aspect, the state parameter of the milk storage container includes at least one of the amount of milk in the milk storage container, the liquid level in the milk storage container, an empty milk state, a milk state, a full milk state, and a milk liquid detection value per unit height.

[0012] In the above implementation, the differential capacitive sensor assembly can be used to detect a variety of different state parameters of the milk storage container, so as to perform all-round detection of the milk storage container.

[0013] In a possible implementation manner of the first aspect, the detection electrode assembly is detachably fixed to the outer side surface, or is detachably fixed to the outside close to the outer side surface.

[0014] In the above implementation, the user can replace the detection electrode assembly at any time when the detection electrode assembly is damaged or the detection is inaccurate.

[0015] In a possible implementation of the first aspect, the differential capacitive sensor assembly also includes a control circuit; the detection electrode assembly includes at least one group of relatively arranged parallel capacitor groups, the parallel capacitor group includes a first electrode and a second electrode; the control circuit is at least used to charge the detection electrode assembly and detect the capacitance value of the detection electrode assembly.

[0016] In a possible implementation manner of the first aspect, the first electrode and the second electrode are sheet electrodes arranged in parallel, and the first electrode and the second electrode extend along a rising direction of the milk liquid level.

[0017] In a possible implementation of the first aspect, the breast pump further includes a processing unit, the control circuit includes a conversion unit, the conversion unit includes an excitation module, a sampling module and a conversion module; the excitation module generates a charging signal for charging the detection electrode assembly, the charge on the detection electrode assembly is transmitted to the conversion module through the sampling module, and the conversion module converts the analog voltage into a digital signal; the processing unit is used to calculate the state parameter of the milk storage container corresponding to the differential capacitive sensor assembly according to the digital signal.

[0018] In a possible implementation manner of the first aspect, a distance between the first electrode and the second electrode is greater than a distance between the differential capacitive sensor assembly and an inner side surface of a housing of the milk storage container.

[0019] In the above implementation, the distance between the first electrode and the second electrode is greater than the distance between the differential capacitive sensor assembly and the inner side of the milk storage container shell, which can ensure that the electric field lines between the two electrodes pass through the inner side of the milk storage container, thereby detecting the change in the liquid level.

[0020] In a possible implementation manner of the first aspect, the breast pump further includes a host, and the differential capacitive sensor assembly is disposed on the host.

[0021] In the above implementation, when the breast pump is in use, the host is fixedly mounted on the milk storage container, and the differential capacitive sensor assembly is arranged on the host in an area close to the outer side of the milk storage container, thereby realizing non-contact measurement of the state parameters of the milk storage container.

[0022] In a possible implementation of the first aspect, the host includes a host housing, the detection electrode assembly is arranged on the host housing, the host housing is mounted on the outer side of the milk storage container housing or at least partially contacts the outer side of the milk storage container housing, and the detection electrode assembly is close to or contacts the outer side of the milk storage container housing.

[0023] In a possible implementation manner of the first aspect, the host housing includes an inner side surface close to the interior of the host and an outer side surface away from the interior of the host; and the detection electrode assembly is disposed on the inner side surface of the host housing.

[0024] In the above implementation, the arrangement on the inner side of the host housing can, on the one hand, prevent the detection electrode assembly from being scratched or bumped, and on the other hand, facilitate the electrical connection between the detection electrode assembly and the control circuit.

[0025] In a possible implementation manner of the first aspect, the host further includes a component setting layer and a sensor setting layer, wherein the sensor setting layer is arranged between the component setting layer and the host housing; and the parallel capacitor group is arranged in the sensor setting layer.

[0026] In a possible implementation manner of the first aspect, the sensor setting layer has an electric shielding effect, and the parallel capacitor group is arranged on a side of the sensor setting layer close to the host housing.

[0027] In the above implementation, the sensor setting layer has an electrical shielding effect, which can reduce the interference of electronic devices in the host to the detection electrode assembly and improve the detection accuracy.

[0028] In a possible implementation of the first aspect, the host includes a main body extending in a direction in which the milk level rises and a base located below a bottom wall of a milk storage container; the milk storage container includes a side wall extending in a direction in which the milk level rises and a bottom wall connected to the side wall; the main body contacts or is close to the side wall, and the base contacts or is close to the bottom wall; the milk storage container is installed above the base, and the detection electrode assembly includes at least one parallel capacitor group arranged on the base.

[0029] In a possible implementation of the first aspect, the host includes a main body extending in a direction in which the milk level rises and a top seat located above a top wall of a milk storage container; the milk storage container includes a side wall extending in a direction in which the milk level rises and a top wall connected to the side wall; the main body contacts or is close to the side wall, and the top seat contacts or is close to the top wall; the milk storage container is installed below the top seat, and the detection electrode assembly includes at least one parallel capacitor group arranged on the top seat.

[0030] In a possible implementation manner of the first aspect, the host further includes a bottom wall, the milk storage container further includes a top wall, the bottom wall of the host is fixed to the top wall of the milk storage container; and the detection electrode assembly includes at least one parallel capacitor group arranged on the bottom wall of the host.

[0031] In a possible implementation manner of the first aspect, the detection electrode assembly is fixedly disposed on an outer surface of the milk storage container shell and is electrically connected to a control circuit disposed in the host.

[0032] In a possible implementation manner of the first aspect, the detection electrode assembly includes a plurality of parallel capacitor groups that are relatively arranged.

[0033] In the above implementation, the detection electrode assembly includes a plurality of parallel capacitor groups arranged opposite to each other, so as to detect a plurality of state parameters of the milk storage container.

[0034] In a possible implementation of the first aspect, the detection electrode assembly includes a first parallel capacitor group and a second parallel capacitor group, the first parallel capacitor group is used to measure a first milk volume range or a first liquid level height range; the second parallel capacitor group is used to measure a second milk volume range or a second liquid level height range.

[0035] In the above implementation, two parallel capacitor groups are used to detect the change in liquid level or milk volume, which can improve the detection accuracy.

[0036] In a possible implementation manner of the first aspect, the differential capacitive sensor assembly includes at least a milk full detection parallel capacitor group for measuring a milk full state of the milk storage container; the milk full detection parallel capacitor group is arranged near the top of the milk storage container.

[0037] In the above implementation, the milk full detection parallel capacitor group detects the milk full state of the milk storage container, which can prevent the milk storage container from overflowing.

[0038] In a possible implementation manner of the first aspect, the differential capacitive sensor assembly includes at least an empty milk detection parallel capacitor group for measuring an empty milk state of the milk storage container; the empty milk detection parallel capacitor group is arranged near the bottom of the milk storage container.

[0039] In the above implementation, the empty milk detection parallel capacitor group detects the empty milk state of the milk storage container, and can accurately measure the critical state of the mother's milk discharge, which is conducive to the intelligent milk pumping of the breast pump.

[0040] In a possible implementation manner of the first aspect, the differential capacitive sensor assembly includes at least a unit height detection parallel capacitor group for detecting a unit height milk detection value; the unit height detection parallel capacitor group is arranged at the bottom of the milk storage container.

[0041] In the above implementation, due to the different dielectric constants of milk from different mothers, human touch interference, and process errors in the factory state of the breast pump due to manufacturing and assembly, the mapping relationship between the detection value of the differential capacitive sensor component and the liquid level or milk volume is not fixed. Therefore, in this implementation, the unit height milk detection value is detected to eliminate or reduce the influence of the above interference on the liquid level or milk volume detection, thereby improving the detection accuracy of the liquid level or milk volume.

[0042] In a possible implementation manner of the first aspect, the multiple parallel capacitor groups are at least two of a milk quantity detection parallel capacitor group, an empty milk detection parallel capacitor group, an empty milk detection parallel capacitor group, and a unit height detection parallel capacitor group.

[0043] In a possible implementation of the first aspect, the breast pump further includes: a breast shield, the breast shield including a flange for fitting the breast; a milk storage container for receiving and storing breast milk collected by the breast shield, the milk storage container being connected to the breast shield; and the main unit including a negative pressure mechanism, the negative pressure mechanism being used to directly or indirectly apply negative pressure to the breast shield to pump the breast milk into the milk storage container.

[0044] In a second aspect, the embodiments of the present application further provide a differential capacitive sensor assembly, which can be detachably mounted on a milk storage container of a breast pump and detect state parameters of the milk storage container.

[0045] In the above embodiment, when the differential capacitive sensor assembly has reduced accuracy, is damaged, or is dirty, the user can disassemble the differential capacitive sensor assembly for replacement or cleaning, making the breast pump easy to maintain. Furthermore, the differential capacitive sensor assembly is used to detect the state parameters of the milk storage container, which has good anti-interference effect against external interference and high detection accuracy.

[0046] In a possible implementation manner of the second aspect, the differential capacitive sensor assembly includes a communication port, and the communication port is used to insert a connecting line to communicate with the breast pump.

[0047] In the above implementation, by connecting through a connecting wire, the breast pump can power the differential capacitive sensor assembly, and the differential capacitive sensor assembly does not need to be provided with a power supply device, which makes it easy to realize a lightweight design of the differential capacitive sensor assembly.

[0048] In a possible implementation manner of the second aspect, the differential capacitive sensor assembly includes a wireless communication module, and the wireless communication module is used to perform wireless communication with the breast pump.

[0049] In the above implementation, wireless communication can simplify the wiring design in the breast pump and facilitate installation by the user.

[0050] In a possible implementation of the second aspect, the differential capacitive sensor assembly includes a detection electrode assembly and a control circuit; the detection electrode assembly includes at least one group of relatively arranged parallel capacitor groups, the parallel capacitor group includes a first electrode and a second electrode; the control circuit is at least used to charge the detection electrode assembly and detect the capacitance value of the detection electrode assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 Schematic diagram of a parallel plate capacitor provided in an embodiment of the present application.

[0052] Figure 2 It is a detection principle diagram of the differential capacitive sensor assembly provided in an embodiment of the present application.

[0053] Figure 3 It is a schematic diagram of the liquid level detection principle of the differential capacitive sensor assembly provided in an embodiment of the present application.

[0054] Figure 4 This is a first stereoscopic view of a first type of breast pump provided in an embodiment of the present application.

[0055] Figure 5 This is a first exploded view of the first type of breast pump provided in an embodiment of the present application.

[0056] Figure 6 This is a second exploded view of the first type of breast pump provided in an embodiment of the present application.

[0057] Figure 7 It is a schematic diagram of the host of the first type of breast pump hidden behind the shell provided in an embodiment of the present application.

[0058] Figure 8 This is a schematic diagram of the first setting of a differential capacitive sensor assembly for measuring liquid level or milk volume on a host housing provided in an embodiment of the present application.

[0059] Fig. 9 This is a schematic diagram of a second setting of a differential capacitive sensor assembly for measuring liquid level or milk volume on a host housing provided in an embodiment of the present application.

[0060] Fig.10 This is a schematic diagram of a third setting of a differential capacitive sensor assembly for measuring liquid level or milk volume on a host housing provided in an embodiment of the present application.

[0061] Fig.11 This is a fourth schematic diagram of the setting of a differential capacitive sensor assembly for measuring liquid level or milk volume on a host housing provided in an embodiment of the present application.

[0062] Fig.12 This is a fifth setting diagram of a differential capacitive sensor assembly for measuring liquid level or milk volume on a host housing provided in an embodiment of the present application.

[0063] Fig.13 This is a first configuration diagram of the differential capacitive sensor assembly provided in an embodiment of the present application in a sensor configuration layer.

[0064] Fig.14 This is a second configuration diagram of the differential capacitive sensor assembly provided in an embodiment of the present application in the sensor configuration layer.

[0065] Fig.15 This is a third configuration diagram of the differential capacitive sensor assembly in the sensor configuration layer provided in an embodiment of the present application.

[0066] Fig.16 It is a supplementary schematic diagram of the differential capacitive sensor assembly for measuring the empty milk state provided in the embodiment of the present application.

[0067] Fig.17 It is a detection principle diagram of a differential capacitive sensor assembly for simultaneously detecting an empty milk state and a unit height milk detection value provided in an embodiment of the present application.

[0068] Fig.18 It is a schematic diagram of a first combination setting method of multiple groups of differential capacitive sensor components provided in an embodiment of the present application.

[0069] Fig.19Schematic diagram of a second combination arrangement of multiple groups of differential capacitive sensor assemblies provided in an embodiment of the present application.

[0070] Fig. 20 It is a schematic diagram of a third combination setting method of multiple groups of differential capacitive sensor components provided in an embodiment of the present application.

[0071] Fig.21 Schematic diagram of a fourth combination arrangement of multiple groups of differential capacitive sensor assemblies provided in an embodiment of the present application.

[0072] Fig. 22 Schematic diagram of a fifth combination arrangement of multiple groups of differential capacitive sensor assemblies provided in an embodiment of the present application.

[0073] Fig.23 It is a first stereoscopic view of the second type of breast pump provided in an embodiment of the present application.

[0074] Fig.24 This is a first exploded view of the second type of breast pump provided in an embodiment of the present application.

[0075] Fig.25 It is a schematic diagram of the host of the second type of breast pump provided in an embodiment of the present application.

[0076] Fig.26 This is a first schematic diagram of a milk storage container of a second type of breast pump provided in an embodiment of the present application.

[0077] Fig. 27 This is a second schematic diagram of a milk storage container of a second type of breast pump provided in an embodiment of the present application.

[0078] Fig.28 It is a schematic diagram of the milk full state detection method provided in an embodiment of the present application.

[0079] Fig.29 This is a first setting diagram of the photoelectric sensor provided in an embodiment of the present application.

[0080] Fig.30 2 is a schematic diagram of a second configuration of the photoelectric sensor provided in an embodiment of the present application.

[0081] Fig.31 It is a flow chart of a method for controlling a breast pump provided in an embodiment of the present application.

[0082] Fig.32 It is a schematic diagram of the structure of the third type of breast pump provided in an embodiment of the present application. DETAILED DESCRIPTION

[0083] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar units or units with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0084] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by terms such as "length", "width", "up", "down", "left", "right", "horizontal", "top" and "bottom" are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0085] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0086] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two units or the interaction relationship between two units. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0087] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0088] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the examples of various specific processes and materials provided by the present invention, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0089] Specifically, a capacitive sensor is a conversion device that converts the measured physical quantity or mechanical quantity into a change in capacitance. In fact, it is a capacitor with variable parameters. When the capacitance of the capacitive sensor changes, the amount of charge on its plates will change, so that a corresponding relationship between the charge change and the measured physical quantity or mechanical quantity can be established, thereby realizing the identification of the measured physical quantity or mechanical quantity.

[0090] Next, we will introduce the basic principle of parallel plate capacitors, which are the basis for building capacitive sensors. Figure 1 , Figure 1 Schematic diagram of a parallel plate capacitor provided in an embodiment of the present application.

[0091] like Figure 1 As shown, the first electrode and the second electrode are metal conductors parallel to each other, also known as plates or electrodes. There is a uniform electric field distribution in the part between the two electrodes. Due to the edge effect, the electric field lines at the edge of the capacitor are curved and divergent.

[0092] The capacitance of a parallel plate capacitor is calculated as follows:

[0093] in, is the dielectric constant of the material between the plates, S is the area facing the two electrodes of the capacitor, is the dielectric constant of free space (8.85 x F / m), d is the distance between the two electrodes of the capacitor.

[0094] Figure 1 Here S is equal to W times L.

[0095] In the related art, an inductive capacitive sensor is used on a breast pump to detect some parameters of the milk storage container of the breast pump. For example, multiple inductive capacitive sensors are used to detect the liquid level of milk in the milk storage container, so as to calculate the current volume of milk in the milk storage container according to the liquid level of the milk.

[0096] Specifically, the inductive capacitance sensor can only output high-level signals and low-level signals. The high-level signal reflects that the capacitance change is greater than the preset threshold, and it is considered that the liquid level has reached the liquid level corresponding to the inductive capacitance sensor. The low-level signal reflects that the capacitance change is less than the preset threshold, and it is considered that the liquid level has not reached the liquid level corresponding to the inductive capacitance sensor.

[0097] For example, a first inductive capacitive sensor is arranged at a first height on the container wall of the milk storage container, and a second inductive capacitive sensor is arranged at a second height. If the first inductive capacitive sensor outputs a high level signal, it is considered that the liquid level of the milk storage container has reached a first liquid level height corresponding to the first inductive capacitive sensor. If the detection value of the second inductive capacitive sensor outputs a high level signal, it is considered that the liquid level of the milk storage container has reached a second liquid level height corresponding to the second inductive capacitive sensor.

[0098] However, when the milk storage container is stuck to the wall, which means that the milk "sticks" to the container wall due to surface tension, if the milk happens to be completely or partially "stuck" in the detection area of ​​the inductive capacitive sensor, it is very likely that the inductive capacitive sensor will erroneously output a high-level signal, resulting in incorrect milk volume detection.

[0099] For another example, when the liquid level in the milk storage container is tilted, if the milk covers the detection area of ​​the inductive capacitive sensor, the detection value of the inductive capacitive sensor may erroneously output a high-level signal, resulting in an error in the milk amount detection.

[0100] Therefore, the inductive capacitive sensor is easily affected by milk sticking to the wall, liquid surface shaking, liquid surface tilt, factory machine parameter errors, human contact, differences in dielectric constants of different mothers' milk or other interference contacts, resulting in poor results in the current use of inductive capacitive sensors to detect the amount of milk in milk storage containers.

[0101] Specifically, conventional inductive capacitive sensors are used to detect self-capacitance, which is the capacitance between the electrode of the capacitive sensor and the ground. This type of sensor does not require two electrodes, but relies on the capacitance change generated when the target object approaches the sensor for detection.

[0102] like Figure 2-3This is an implementation of the present application, which is the basic principle of differential capacitance detection of liquid level. In response to the problems existing in inductive capacitance sensors, this implementation adopts a differential capacitance sensor assembly as a sensor for detecting state parameters of a milk storage container in a breast pump. The differential capacitance sensor assembly includes a detection electrode assembly, and the detection electrode assembly is a capacitor composed of two electrodes that are parallel to each other and oppositely arranged. The differential capacitance sensor assembly is used to detect the mutual capacitance between the two electrodes of the capacitor, and its output result is no longer a high or low level signal, but a capacitance change value between the two electrodes or a digital signal converted from the capacitance change value.

[0103] For the sake of convenience, the capacitor formed by two electrodes arranged parallel to each other and opposite to each other in the differential capacitance sensor assembly is called a parallel capacitor group. In a possible implementation, the parallel capacitor group is Figure 3 The standard parallel plate capacitor shown, Figure 3 The parallel capacitor group in the embodiment includes a first electrode 1000 and a second electrode 2000, and the facing planes of the two electrodes are completely aligned. In another possible implementation, the facing planes of the two electrodes of the parallel capacitor group are only partially aligned, and parts of the first electrode and the second electrode are staggered.

[0104] Furthermore, the differential capacitance sensor assembly in the present application includes not only a parallel capacitance group, but also a control circuit connected to the parallel capacitance group, see Figure 2 The control circuit is used to charge the parallel capacitor group and collect the charge on the parallel capacitor group after a preset time, and determine the capacitance value of the parallel capacitor group according to the charge change speed and / or charge change amount.

[0105] The control circuit includes a conversion unit, and the conversion unit includes an excitation module, a sampling module and a conversion module.

[0106] The excitation module generates a charging signal for charging the differential capacitance sensor component. The charge on the differential capacitance sensor component is transmitted to the conversion module through the sampling module, and the conversion module converts the analog voltage into a digital signal.

[0107] The conversion module is connected to the processing unit, and the processing unit is used to calculate the state parameter of the milk storage container corresponding to the differential capacitive sensor assembly according to the digital signal.

[0108] Optionally, the conversion unit is a capacitance-to-digital converter, and optionally, the conversion module is an analog-to-digital converter (ADC).

[0109] The following is a further introduction to the conversion unit. Please continue to refer to Figure 2 , Figure 2is a detection principle diagram of a differential capacitive sensor assembly provided in an embodiment of the present application. Figure 2 As shown, the detection electrode assembly is connected to the conversion unit. Figure 2 The sampling module in the control circuit includes a switch capacitor circuit and a sample-and-hold circuit.

[0110] The excitation module is used to generate an excitation signal, and the excitation signal is used to charge the parallel capacitor group in the detection electrode assembly. In some cases, the excitation signal is generated by an oscillator in the excitation module. In other cases, the excitation signal is generated by a clock signal received by the excitation module. This application is not limited.

[0111] The switched capacitor circuit is used to close the switch at the appropriate time to transfer the charge on the parallel capacitor group to the input of the ADC.

[0112] The sample-and-hold circuit is used to keep the voltage on the parallel capacitor group stable before the conversion module performs conversion, ensuring that the analog-to-digital converter reads a stable voltage value during the conversion process.

[0113] The conversion module is used to convert the analog voltage into a digital signal and input the digital signal into the processing unit ( Figure 2 In some cases, the conversion module may also perform digital filtering during the conversion process to improve conversion accuracy.

[0114] The processing unit is used to determine the state parameter of the milk storage container corresponding to the differential capacitive sensor component according to the digital signal and the preset mapping relationship.

[0115] The structure of the control circuit described above is for illustration only. In some embodiments, the control circuit may also include more or fewer components than shown in the figure, or combine certain components, or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware. For example, some or all of the functions of the conversion unit may be integrated into the processing unit to save the setting space, or a processing unit may be added to the conversion unit, which is not limited by the present application.

[0116] An implementation of a differential capacitive sensor assembly for detecting liquid level will be described below.

[0117] See also Figure 3 , Figure 3 It is a schematic diagram of the liquid level detection principle of the differential capacitive sensor assembly provided in an embodiment of the present application. Figure 3 The control circuit is not shown.

[0118] like Figure 3 As shown, Figure 3The electric field includes straight electric field lines from the plane facing the first electrode 1000 to the plane facing the second electrode 2000, and also includes curved electric field lines from the side of the first electrode 1000 to the side of the second electrode 2000. The curved electric field lines pass through the liquid storage space of the container. Because the dielectric constant of the liquid is much larger than the dielectric constant of the air, as the liquid level rises, the dielectric constant between the two electrodes gradually increases, thereby increasing the capacitance value of the parallel capacitor group.

[0119] Understandably, Figure 3 Only some of the electric field lines of the parallel capacitor group are shown.

[0120] Figure 3 The capacitance change of the differential capacitance sensor assembly is proportional to the change of the liquid level, so after the capacitance change is converted into a specific digital signal change, the specific change of the liquid level can be calculated based on the digital signal change. However, the capacitance change of the inductive capacitance sensor is not proportional to the change of the liquid level, and the processing unit can only determine whether the liquid level has reached the corresponding height of the inductive capacitance sensor through the high-level signal or low-level signal output by the inductive capacitance sensor.

[0121] Compared with the existing technology where one inductive capacitive sensor only corresponds to one liquid level measurement method, Figure 3 The differential capacitance sensor assembly is arranged along the rising direction of the liquid level in the container, so that Figure 3 All liquid level changes in the process from empty milk to full milk in the middle container can be detected by a differential capacitive sensor component, so that one sensor can measure all liquid level heights.

[0122] Optionally, a shielding layer 3000 is further provided on the side of the first electrode and the second electrode away from the container to reduce external interference. The first electrode and the second electrode are defined to detect the liquid level of the container through the electric field lines of the first side surface. The above situation can also be understood as a sensor setting layer that blocks the electric field lines of the second side surface is provided near the second side surface opposite to the first side surface, thereby reducing external interference.

[0123] Figure 3 Where d1 is the distance between two opposite planes facing the first electrode and the second electrode, d2 is the distance between the first electrode and the second electrode and the liquid storage space of the container, and the distance d1 between two opposite planes facing the first electrode and the second electrode of the parallel capacitor group is called the spacing of the differential capacitance sensor assembly. The spacing d1 of the parallel capacitance group is proportional to its detection distance. In order to ensure that the differential capacitance sensor assembly can detect the change in the liquid level height of the liquid storage space, it is necessary to ensure that d1 is greater than or equal to d2.

[0124] For example, assuming Figure 3The maximum detection distance of the parallel capacitor group is d2. When the container is far away from the differential capacitor sensor assembly, so that the distance between the container and the differential capacitor sensor assembly is greater than d2, the spacing d1 can be increased to increase the detection range of the parallel capacitor group.

[0125] However, this application is not limited to Figure 3 The embodiment shown.

[0126] In another possible implementation, the electric field lines between the facing plane of the first electrode and the facing plane of the second electrode in the differential capacitive sensor assembly pass through at least a portion of the milk storage space in the milk storage container, and the liquid level is detected through the electric field lines between the facing planes.

[0127] In some other possible implementations, the present application may also set up multiple groups of differential capacitance sensor assemblies to detect changes in liquid level height. In one possible implementation, each differential capacitance sensor assembly is used to measure liquid level heights in different ranges, thereby improving measurement accuracy. In another possible implementation, each differential capacitance sensor assembly is used to detect liquid level heights in the same range, and the detection results are processed to ensure the validity of the measurement results.

[0128] In the present application, a differential capacitive sensor assembly is used to measure the state parameters of a milk storage container in a breast pump. The state parameters of the milk storage container are described below.

[0129] The state parameter of the milk storage container includes at least one of the amount of milk in the milk storage container, the height of the liquid level in the milk storage container, an empty milk state, a full milk state, and a milk liquid detection value per unit height.

[0130] Among them, the amount of milk in the milk storage space and the liquid level height in the milk storage space are related parameters. Because when the structure of the milk storage container is fixed, a clear corresponding relationship can be established between the liquid level height and the amount of milk. When determining the amount of milk based on the detection value of the differential capacitive sensor component, the amount of milk can be directly determined based on the mapping relationship between the detection value and the amount of milk, or the liquid level height can be determined based on the detection value first, and then the milk amount can be determined based on the liquid level height. This application does not impose any restrictions.

[0131] The expression form of the milk volume in the milk storage space includes any one or more of the milk volume ratio value, milk volume volume value, milk volume weight value and milk volume degree value, or other expression forms. The milk volume ratio value is, for example, 50%, which means that the current milk volume is 50% of the maximum storage capacity of the milk storage container, the milk volume value is, for example, 50mL, the milk weight value is, for example, 10g, and the milk volume degree value is, for example, empty, low, medium, high, full, etc. The above examples are for illustration only and do not constitute any limitation on the expression form of the milk volume in the milk storage space.

[0132] The expression form of the liquid level in the milk storage space includes any one or more of the liquid level ratio value, the liquid level specific value, and the liquid level degree value, or other expression forms. The liquid level ratio value is, for example, 50%, the liquid level specific value is, for example, 5 cm, and the liquid level degree value is, for example, empty, low, medium, high, full, etc. The above examples are for illustration only and do not constitute any limitation on the expression form of the milk volume in the milk storage space.

[0133] The empty milk state in the state parameters of the milk storage container includes an empty milk state and a non-empty milk state. The empty milk state refers to that there is no milk stored in the milk storage container or the amount of milk stored has not reached the empty milk preset value, and the non-empty milk state refers to that there is milk stored in the milk storage container or the amount of milk stored has reached the empty milk preset value. The specific value of the empty milk preset value can be set as needed, and this application does not impose any restrictions. The detection of the empty milk state of the milk storage container is conducive to monitoring the state change from empty milk to milk, which is convenient for the breast pump to make prompts or intelligent control based on the state change. The detection of the empty milk state of the milk storage container is also conducive to identifying the basic interference caused by the capacitance difference caused by the process errors of the manufacturing and assembly of the breast pump in the factory state, thereby improving the accuracy of milk quantity detection or milk full detection.

[0134] The milk full state in the state parameter of the milk storage container includes a milk full situation and a non-milk full situation. The milk full situation refers to the amount of milk stored in the milk storage container reaching the milk full preset value. The milk full preset value can be the situation where the milk storage container is completely filled, or it can be a preset threshold close to the milk full state. More preferably, there is a certain distance from the complete milk full state to reserve the milk inertia to cause milk overflow, or other reasonable threshold settings close to the milk full state. The non-milk full situation refers to the amount of milk stored in the milk storage container not reaching the milk full preset value. The specific value of the milk full preset value can be set as needed, and this application does not limit it.

[0135] The milk state in the state parameter of the milk storage container includes a milk state and a milk-free state. Optionally, the milk state is when the milk volume reaches a milk preset value, and the milk state is when the milk volume does not reach the milk preset value. The milk preset value may be between the empty milk preset value and the full milk preset value, so as to accurately determine whether the milk storage container stores milk.

[0136] The unit height milk detection value in the state parameter of the milk storage container can be expressed as the detection value of the differential capacitive sensor assembly as a reference sensor, which is used to quantify the interference of the differential capacitive sensor assembly as a working sensor in the milk storage container, such as interference caused by different dielectric constants of milk from different mothers, human touch interference, basic interference caused by capacitance differences caused by process errors in the factory state of the breast pump due to manufacturing and assembly, temperature change interference, etc. The details will be explained in the subsequent part of the manual and will not be repeated here.

[0137] By detecting the empty milk state, the critical state of the mother's milk discharge can be accurately measured, which is conducive to the intelligent milk extraction of the breast pump.

[0138] By detecting the amount of milk in the milk storage container and the liquid level in the milk storage container, the user can know whether the amount of milk stored is sufficient.

[0139] By detecting the full milk state, you can stop sucking milk in time to prevent the milk storage container from overflowing.

[0140] Testing the unit height milk detection value can reduce or eliminate the influence of different dielectric constants of milk from different mothers, interference from human touch, and process errors of breast pumps in factory status such as manufacturing and assembly, on liquid level height or milk volume detection, thereby improving the accuracy of liquid level height or milk volume detection.

[0141] Optionally, the working sensor is a differential capacitive sensor assembly for detecting a status parameter of any other milk storage container.

[0142] It is worth mentioning that the inductive capacitive sensor in the background art can only output 0 or 1 signals, so the inductive capacitive sensor cannot be used to detect the unit height milk detection value.

[0143] Further, in order to detect the state parameter change of the milk storage container, the electric field lines of the differential capacitance sensor assembly usually need to at least partially pass through the milk storage space of the milk storage container. More specifically, in order to ensure that the differential capacitance sensor assembly can detect the state parameter change of the milk storage container, the spacing between the two electrodes of the parallel capacitance group is greater than the distance between the differential capacitance sensor assembly and the inner side of the housing of the milk storage container.

[0144] As another exception, the differential capacitive sensor assembly may not measure the milk storage container, but may determine the state parameters of the milk storage container by measuring other components. For example, in subsequent embodiments, the empty milk state of the milk storage container is determined by measuring whether milk flows from the breast shield 10 in the mounting hole 32. The details will be explained in the subsequent parts of the specification and will not be repeated here.

[0145] The dielectric constant of liquid is usually much larger than that of air. For example, the dielectric constant of air is close to 1, and the dielectric constant of water is generally 80~81. As a complex biological liquid, milk mainly consists of water, fat, protein, sugar, etc. The dielectric properties of these components are different, but the dielectric constant of milk is also much larger than that of air. Therefore, when there is no milk in the milk storage space, the dielectric constant in the parallel plate capacitor formula is When the milk storage space is small and there is milk in it, the dielectric constant in the parallel plate capacitor formula increases, resulting in a change in the capacitance of the parallel capacitor group in the differential capacitance sensor assembly.

[0146] The present application provides a breast pump, which includes: a milk storage container for storing milk and a differential capacitive sensor assembly for detecting state parameters of the milk storage container. The milk storage container includes a milk storage container shell, and the milk storage container shell includes an inner side surface contacting the milk and an outer side surface not contacting the milk.

[0147] The differential capacitive sensor assembly comprises a detection electrode assembly, which is arranged on the outer side surface or close to the outer side of the outer side surface, wherein the outer side is used to indicate that the differential capacitive sensor assembly is not located inside the milk storage container.

[0148] The specific structures of different types of breast pumps will be introduced below, and it will be explained how to set a differential capacitive sensor component on a breast pump of this structure to detect status parameters of different milk storage containers.

[0149] The first type of breast pump is described below.

[0150] like Figure 4-6 As shown, it is another embodiment of the present application, wherein Figure 4 is a first stereoscopic view of a first type of breast pump. Figure 5 This is the first exploded view of the first type of breast pump. Figure 6 This is the second exploded view of the first type of breast pump.

[0151] like Figures 4 to 6 As shown, the breast pump 1 comprises a breast shield 10 , a milk storage container 20 and a host 30 .

[0152] The breast shield 10 is used to cover the human breast and fit the breast. The breast shield 10 is a trumpet-shaped flange for fitting the breast, and the milk storage container 20 includes a nipple receiving portion 22 for accommodating a nipple.

[0153] The milk storage container 20 is used to receive and store breast milk collected by the breast shield 10 , and the milk storage container 20 is in communication with the breast shield 10 .

[0154] Optionally, the milk storage container 20 includes a milk cap, a milk bowl, a milk bottle, etc., which is not limited in the present application.

[0155] The host 30 is also provided with a negative pressure mechanism, which can directly or indirectly apply negative pressure to the breast shield 10 to suck breast milk into the milk storage container 20 .

[0156] Negative pressure mechanisms include, but are not limited to, piezoelectric pumps, diaphragm pumps, hydraulic pumps, mechanical pumps, and the like.

[0157] Optionally, the host 30 may also include one or more components such as a power supply module, a negative pressure air circuit, a control circuit board, and a solenoid valve.

[0158] The energy supply module is used to provide energy to the negative pressure mechanism to support the operation of the negative pressure mechanism. Specifically, the energy supply module can be a storage battery, a dry cell, or can be directly connected to an external power source through a power cord.

[0159] The host 30 is further provided with a mounting hole 32 , through which the breast shield 10 is inserted into the host and is liquid-connected to the milk storage container 20 . The breast milk sucked out by the breast shield 10 flows into the one-way valve assembly 24 and then flows into the milk storage container 20 .

[0160] The milk storage container 20 comprises a milk storage container shell 21 , a nipple channel 22 , a negative pressure chamber 23 , a one-way valve assembly 24 , a diaphragm cover 25 , and an air hole 26 .

[0161] The milk storage container housing 21 includes a first shell 211 and a second shell 212, and the second shell 212 is attached to or close to the host 30. The first shell 211 and the second shell 212 can be integrally formed, or can be detachably mounted. The mounting edges of the first shell 211 and the second shell 212 are provided with sealing rings or other sealing mechanisms to ensure that milk does not leak from the mounting edges.

[0162] The negative pressure chamber 23 includes a diaphragm (not shown in the figure), and the diaphragm cover 25 is fixedly installed on the negative pressure chamber 23 and seals the diaphragm. The diaphragm cover 25 is also provided with an air hole 26. The host 30 is also provided with a negative pressure socket 34, which is inserted into the air hole 26, so that negative pressure is indirectly applied to the negative pressure chamber 23 through the diaphragm, so that the user produces milk and it is collected by the breast shield 10.

[0163] The milk collected by the breast shield 10 enters the milk storage space through the one-way valve assembly 24. When the breast pump 1 is working, it will cycle through the milk suction-air intake process. When the breast pump 1 is working to suck milk, the valve of the one-way valve in the one-way valve assembly 24 is closed. When the breast pump 1 is working to intake air, the valve of the one-way valve in the one-way valve assembly 24 is opened.

[0164] Optionally, the portion of the mainframe 30 shell that fits and / or is close to the milk storage container is the mainframe housing 31; preferably, the differential capacitive sensor assembly is integrally arranged inside the mainframe housing to provide better protection for the sensor, wherein the parallel capacitor group is fixedly arranged on the side of the mainframe housing 31 to be as close to one side of the milk storage container as possible, so as to minimize the distance between the parallel capacitor group and the detection liquid surface.

[0165] See also Figure 7 , Figure 7 It is a schematic diagram of the host of the first type of breast pump hidden behind the shell provided in an embodiment of the present application.

[0166] Optionally, the host 30 further includes a component setting layer 36 and a sensor setting layer 37 , and the sensor setting layer 37 is disposed between the component setting layer 36 and the host housing 31 .

[0167] The component setting layer 36 is used to set the remaining electronic components in the host 30 except the differential capacitive sensor assembly, such as a negative pressure pump, a processing unit, etc. In some cases, the control circuit in the differential capacitive sensor assembly is set in the component setting layer 36, and the parallel capacitor group is set in the sensor setting layer 37 and connected to the control circuit in the component setting layer 36 through wires.

[0168] Optionally, the sensor setting layer 37 has an electrical shielding effect, so that the sensor setting layer 37 can shield the influence of the electronic devices on the host on the differential capacitance sensor assembly, thereby improving the detection effect of the differential capacitance sensor assembly.

[0169] In some cases, the sensor setting layer 37 is made of one or more metal materials such as iron, copper, aluminum, silver, etc., so as to have an electric shielding effect. In other cases, the inner side of the sensor setting layer 37 close to the component setting layer 36 is coated with a conductive coating so as to have an electric shielding effect. However, the present application is not limited thereto, and the above cases are only used for illustration.

[0170] In some embodiments, the host 30 includes a main body 33 and a base 34 extending in the direction of the rising milk level. The milk storage container 20 is installed above the base 34. The milk storage container includes a side wall (not shown in the figure) extending in the direction of the rising milk level and a bottom wall (not shown in the figure) connected to the side wall. The main body 33 contacts or is close to the side wall, and the base 34 contacts or is close to the bottom wall.

[0171] In other embodiments, the host 30 includes a main body 33 and a top seat 35 extending in the direction of the milk liquid level rising, and the milk storage container 20 is installed below the top seat 35 (see Fig.15 ), the milk storage container 20 includes a side wall (not shown in the figure) extending along the rising direction of the milk liquid level and a top wall (not shown in the figure) connected to the side wall; the main body 33 contacts or is close to the side wall, and the top seat 35 contacts or is close to the top wall.

[0172] Optionally, when the host 30 includes a base 34, at least one of the first shell 211 or the second shell 212 has a portion that fits the base 34 in the host 30, and the parallel capacitor group is arranged in a shell on the base 34 close to the milk storage container 20. Optionally, when the host 30 includes a top seat 35, at least one of the first shell 211 or the second shell 212 fits the top seat 35 in the host 30, and the parallel capacitor group is arranged in a shell on the top seat 35 close to the milk storage container 20.

[0173] Optionally, when the breast pump 1 comprises a base 34, the sensor arrangement layer 37 extends from the body 33 to the base 34. Optionally, when the breast pump 1 comprises a top seat 35, the sensor arrangement layer 37 extends from the body 33 to the top seat 35.

[0174] Optionally, when the breast pump 1 includes a base 34, the host housing 31 extends from the body 33 to the base 34. Optionally, when the breast pump 1 includes a top seat 35, the host housing 31 extends from the body 33 to the top seat 35.

[0175] The following is an introduction to the optional setting areas of the differential capacitive sensor assembly. The optional setting areas listed below do not limit the functions of the differential capacitive sensor assembly. For example, the differential capacitive sensor assembly used to detect the amount of milk in a milk storage container, the liquid level in a milk storage container, the empty milk state, the full milk state, or the unit height milk detection value can all be set in the following optional setting areas.

[0176] In some embodiments, the differential capacitive sensor assembly is disposed on the outer side of the milk storage container shell that does not contact the milk. In other embodiments, the differential capacitive sensor assembly is disposed on the outside close to the outer side.

[0177] As an example, in the first type of breast pump 1, the area where the differential capacitive sensor assembly can be set includes but is not limited to: 1. The second shell 212 does not contact the outer side of the milk.

[0178] 2. The first shell 211 does not contact the outer side of the milk.

[0179] 3. The main unit housing 31 in the main unit 30 is close to the outer side of the milk storage container 20 or away from the inner side of the milk storage container 20 .

[0180] 4. The sensor setting layer 37 is close to the outer side of the milk storage container 20 or away from the inner side of the milk storage container 20. Preferably, if the sensor setting layer 37 has an electrical shielding effect, the sensor setting layer 37 is arranged on the outer side of the milk storage container 20.

[0181] It is understandable that when the structure of the breast pump changes, the optional setting area will also change accordingly, and the optional setting areas listed above should not be understood as limitations of the embodiments of the present application.

[0182] In some cases, two or more parallel capacitor groups are arranged in different arrangement areas. For example, the first parallel capacitor group for detecting the liquid level is arranged on the outer side of the second housing 212 that does not contact the milk, and the second parallel capacitor group for detecting the liquid level is arranged on the outer side of the first housing 211 that does not contact the milk. In other cases, two or more parallel capacitor groups are arranged in the same arrangement area to facilitate routing and layout.

[0183] In some cases, the differential capacitance sensor assembly further includes a wireless communication module, and the differential capacitance sensor assembly remotely transmits the detection data to the processing unit through the wireless communication module. In other cases, the differential capacitance sensor assembly is connected to the processing unit through a connecting line, and the detection data is transmitted through the connecting line.

[0184] Before describing the solution of the present application in detail through embodiments, it should be noted that all subsequent drawings of the present application only illustrate the specific configuration of the parallel capacitor group in the differential capacitive sensor assembly, and do not illustrate the control circuit. However, this does not mean that the differential capacitive sensor assembly does not require a control circuit, nor does it mean that the control circuit is not provided in the drawings of the present application. The drawings of the present application are only examples and should not constitute any limitation on the embodiments of the present application.

[0185] Furthermore, the descriptions of the setting method and setting position of the differential capacitive sensor assembly at the top or the bottom of the milk storage container in the subsequent contents of this application are all directed to the parallel capacitor group in the differential capacitive sensor assembly and should not be understood as a limitation on the setting position of the control circuit.

[0186] It should also be noted that when describing the bottom and the top of the milk storage container in the subsequent embodiments of the present application, what is described is the bottom and the top in the direction of the rising milk level. The milk stored in the milk storage container rises from the bottom of the milk storage container to the top of the milk storage container along the direction of the rising milk level.

[0187] The following describes how to set up a differential capacitive sensor assembly for measuring liquid level or milk volume.

[0188] When the differential capacitance sensor assembly is used to measure the liquid level or the amount of milk, it is arranged in the setting area along the rising direction of the milk liquid level in the milk storage container.

[0189] For example, the parallel capacitor group in the differential capacitive sensor assembly includes a first electrode and a second electrode, the first electrode includes a first end and a second end, the second end is located below the first end in the direction of rising milk level, the second electrode includes a third end and a fourth end, the fourth end is located below the third end in the direction of rising milk level.

[0190] The differential capacitive sensor assembly is arranged along the rising direction of the milk level in the milk storage container, which means that the direction in which the second end points to the first end is the same as the rising direction of the milk level, or the angle between the direction in which the second end points to the first end and the rising direction of the milk level is smaller than a preset angle, and the direction in which the fourth end points to the third end is the same as the rising direction of the milk level, or the angle between the direction in which the fourth end points to the third end and the rising direction of the milk level is smaller than a preset angle.

[0191] It should be noted that the value of the preset angle is affected by many factors such as capacitor specifications and breast pump structure, and needs to be selected according to actual conditions. However, under normal circumstances, the angle between the direction from the lower end to the upper end and the direction of the rising milk level is less than 90°.

[0192] In one possible implementation, the first electrode and the second electrode are both in a straight line shape, so as to facilitate manufacturing. In another possible implementation, the first electrode and the second electrode are both in a curved or even irregular shape, so as to adapt to a more complex installation space. This application is not limited.

[0193] Furthermore, the range of liquid level height that can be measured by the differential capacitive sensor assembly is determined by the lowest point and the highest point of the first electrode and the second electrode in the direction of the milk liquid level rising. For example, if the milk in the milk storage container rises to a maximum of 10 cm in the direction of the milk liquid level rising, if the lowest point of the first electrode and the second electrode is set at 1 cm, and the highest point of the first electrode and the second electrode is set at 8 cm, then the range of liquid level height that can be detected by the differential capacitive sensor assembly is approximately 1 cm to 8 cm.

[0194] Therefore, when the range of the differential capacitive sensor assembly needs to be increased, the length of the differential capacitive sensor assembly in the direction of the rising milk level can be increased. For example, when the full liquid level height range is desired to be measured, in the direction of the rising milk level, the lowest points of the first electrode and the second electrode can be set at or below the bottom of the milk storage space, and the highest points of the first electrode and the second electrode can be set at or above the top of the milk storage space.

[0195] Optionally, the direction in which the milk level rises is the direction in which the milk level rises when the breast pump is correctly worn on the user's breast. Optionally, the direction in which the milk level rises is the direction in which the milk level rises when the breast pump is placed stably.

[0196] The following will describe in detail the configuration of the differential capacitive sensor assembly for measuring the liquid level or the amount of milk in conjunction with the embodiments.

[0197] In some embodiments, a differential capacitive sensor assembly for measuring the liquid level or the amount of milk is disposed in a host housing 31 of a host 30, see Figures 8 to 12 , Figures 8 to 12 It is a schematic diagram of different settings of a differential capacitive sensor assembly for measuring liquid level or milk volume on a host housing provided in an embodiment of the present application.

[0198] Figures 8 to 12 , and the dotted lines in the subsequent figures indicate the direction in which the milk level rises when the breast pump is worn correctly, that is, the X direction in the figure.

[0199] Figures 8 to 12 The differential capacitive sensor component in the figure can be understood as being arranged on the outer side of the host housing 31, and can also be understood as being arranged on the inner side of the host housing 31.

[0200] In one possible implementation, Figure 8 As shown, the first electrode 411A and the second electrode 412A of the differential capacitive sensor assembly 41A are respectively arranged on both sides of the mounting hole 32, and the arrangement direction of the differential capacitive sensor assembly 41A is the same as the rising direction of the milk liquid level.

[0201] In another possible implementation, Fig. 9 As shown, the first electrode 411B and the second electrode 412B of the differential capacitive sensor assembly 41B are respectively arranged on both sides of the mounting hole 32, and the arrangement direction of the differential capacitive sensor assembly 41B is at a certain angle to the rising direction of the milk liquid level. Optionally, the first electrode and the second electrode may also extend in parallel with the curve.

[0202] In another possible implementation, Fig.10 As shown, the first electrode 411C and the second electrode 412C of the differential capacitive sensor assembly 41C are disposed on the same side of the mounting hole 32 .

[0203] In another possible implementation, Fig.11 As shown, the differential capacitance sensor assembly includes a differential capacitance sensor assembly 41D and a differential capacitance sensor assembly 41E, so that the detection value of the differential capacitance sensor assembly 41D and the detection value of the differential capacitance sensor assembly 41E can be obtained respectively, and the measurement accuracy can be improved by taking an average value, etc., and when one differential capacitance sensor assembly fails, the other can still work normally, thereby improving the durability of the breast pump.

[0204] In another possible implementation, Fig.12 As shown, the differential capacitance sensor assembly includes a differential capacitance sensor assembly 41F and a differential capacitance sensor assembly 41G, and the differential capacitance sensor assembly 41F and the differential capacitance sensor assembly 41G are respectively used to detect liquid levels in different ranges. For example, the differential capacitance sensor assembly 41G is used to detect a liquid level in the range of 0-5 cm, and the differential capacitance sensor assembly 41F is used to detect a liquid level in the range of 5-10 cm. Each differential capacitance sensor assembly is responsible for a different liquid level detection range, which can improve the detection accuracy of the liquid level.

[0205] Understandably, Figures 8 to 12The setting method is not limited to the host housing 31, and can also be applied to other setting areas, such as the outer side of the first shell 211, the outer side of the second shell 212 or the sensor setting layer 37.

[0206] In some other embodiments, the differential capacitive sensor assembly for measuring the liquid level or the amount of milk is disposed on the sensor setting layer 37 of the host 30, see Figures 13 to 15 , Figures 13 to 15 These are schematic diagrams of the first to third settings of the differential capacitive sensor assembly provided in an embodiment of the present application in a sensor setting layer.

[0207] Figures 13 to 15 The differential capacitance sensor assembly 41 for measuring the liquid level or the amount of milk is included. The differential capacitance sensor assembly 41 includes an electrode 411 and an electrode 412. The differential capacitance sensor assembly 41 is arranged on the outer side of the sensor setting layer 37 of the host 30 away from the component setting layer 36 and is arranged along the rising direction X of the milk liquid level.

[0208] It should be noted that Figures 13 to 15 More differential capacitive sensor components may be provided to detect more liquid level ranges or milk volume measurement ranges, or the length of the differential capacitive sensor component 41 in the direction of the milk may be increased to increase the liquid level or milk volume measurement range. For example, the differential capacitive sensor component 41 may be extended in a curved form like the sensor setting layer 37, thereby increasing the liquid level or milk volume measurement range. Figures 13 to 15 The configuration is merely illustrative and should not be construed as limiting the embodiments of the present application.

[0209] like Figures 8 to 15 The differential capacitance sensor assembly shown in any implementation method can measure the change of liquid level height according to the change of capacitance value. Therefore, when milk hangs on the wall, compared with the capacitance change of the differential capacitance sensor assembly caused by the increase of the entire liquid level, the effect of the milk hanging on the wall on the capacitance value change of the differential capacitance sensor assembly is very small. Therefore, the differential capacitance sensor assembly will not mistakenly determine the location of the milk hanging on the wall as the current liquid level like an inductive capacitance sensor, because it measures the total capacitance value corresponding to the milk in the entire measuring range, thereby solving the technical problem of detection error caused by milk hanging on the wall in the prior art.

[0210] The following describes the setup of a differential capacitive sensor assembly for measuring the empty milk state.

[0211] In some embodiments, the differential capacitive sensor assembly for measuring the empty milk state is disposed in a position near the bottom of the milk storage container 20 in the setting area, so as to determine whether the milk storage container 20 is empty or not empty by detecting whether there is milk at the bottom of the milk storage container 20. In other embodiments, the differential capacitive sensor assembly for measuring the empty milk state is disposed in a position near the mounting hole 32 in the setting area. Since the breast shield 10 is inserted into the main unit through the mounting hole 32, the inside of the mounting hole 32 is the inside of the breast shield 10. Therefore, by determining whether milk flows through the breast shield 10, it is possible to determine whether the milk storage container 20 is empty or not empty.

[0212] Preferably, if the milk in the breast pump flows into the milk storage container through the milk inlet, the differential capacitive sensor assembly for measuring the empty milk state is at least partially disposed below the milk inlet in the direction of the milk level rising, because the position below the milk inlet is the fastest to detect whether milk enters the milk storage container, so being at least partially disposed below the milk inlet can most quickly detect whether the milk storage container changes from an empty milk state to a non-empty milk state. In some cases, if the breast pump has a one-way valve, the milk inlet can be a valve of the one-way valve.

[0213] The following will describe in detail the configuration of the differential capacitive sensor assembly for measuring the empty milk state in conjunction with the embodiments.

[0214] In some embodiments, a differential capacitive sensor component for measuring the empty milk state is disposed in the sensor arrangement layer 37 of the breast pump 1 .

[0215] In one possible implementation, see Fig.14 , Fig.14 The differential capacitive sensor assembly 42B for measuring the empty milk state is included, and the differential capacitive sensor assembly 42B includes first electrodes 421B and 422B.

[0216] In one description, the differential capacitive sensor assembly 42B is disposed on the main body 33 of the host 30 at a position close to the bottom of the milk storage container 20, specifically in the sensor setting layer 37 in the main body 33, close to the bottom of the milk storage container 20, for detecting whether there is milk at the bottom of the milk storage container 20, thereby determining whether the milk storage container 20 is empty or not empty. In another description, the differential capacitive sensor assembly 42B is disposed on one side of the mounting hole 32 close to the bottom of the milk storage container 20, specifically in the sensor setting layer 37 on one side of the mounting hole 32 close to the bottom of the milk storage container 20.

[0217] In another possible implementation, see Fig.13 and Fig.15 , Fig.13 and Fig.15The differential capacitive sensor assembly 42A for measuring the empty milk state is included, and the differential capacitive sensor assembly 42A includes first electrodes 421A and 422A. The differential capacitive sensor assembly 42A is arranged in the base 34 of the host 30. Specifically, it is in the sensor setting layer 37 in the base 34, and is used to detect whether there is milk at the bottom of the milk storage container 20, so as to determine whether the milk storage container 20 is empty or not. Preferably, 42A is arranged below the position corresponding to the one-way valve, so that once milk flows out of the one-way valve, 42A can immediately detect the situation of milk flowing out, so that the signal can be immediately fed back to the control circuit to facilitate subsequent mode switching or start the negative pressure system and other control operations.

[0218] In yet another possible implementation, see Fig.16 , Fig.16 is a supplementary schematic diagram of a differential capacitive sensor assembly for measuring the empty milk state provided in an embodiment of the present application. Fig.16 As shown, Fig.16 The differential capacitive sensor assembly 53 for measuring the empty milk state is included, and the differential capacitive sensor assembly 53 includes an electrode 531 and an electrode 532. The differential capacitive sensor assembly 53 is arranged in the main body 33 of the host 30 near the mounting hole 32. Specifically, it is a position near the mounting hole 32 in the sensor setting layer 37 in the main body 33, which is used to detect whether milk flows into the milk storage container 20, so as to determine whether the milk storage container 20 is empty or not empty.

[0219] It should be noted that the differential capacitive sensor components in the above-mentioned figures are all arranged in the sensor setting layer 37, but this should not be understood as a limitation on the present application. In other embodiments, the differential capacitive sensor components can also be arranged in the remaining setting areas in the same or similar manner.

[0220] The empty milk state of the milk storage container is detected by a differential capacitive sensor component, and no contact with milk is required during the detection process, which is highly practical.

[0221] The following describes the setup of a differential capacitive sensor assembly for measuring the milk full state.

[0222] In some embodiments, the differential capacitive sensor assembly for measuring the milk full state is disposed in a position close to the top of the milk storage container 20 in the setting area, so as to determine whether the milk storage container 20 is full of milk or not full of milk by detecting whether there is milk on the top of the milk storage container 20. It should be noted that the milk full state mentioned here may be a state where the milk completely fills the container, but more preferably, it is not completely full but close to a preset position close to full milk, so as to prevent the problem of milk overflowing due to the inertia of the milk.

[0223] The following will describe in detail the configuration of the differential capacitive sensor assembly for measuring the milk full state in conjunction with the embodiments.

[0224] In some embodiments, a differential capacitive sensor component for measuring the milk full state is disposed in the sensor arrangement layer 37 of the breast pump 1 .

[0225] In one possible implementation, see Fig.13 and Fig.14 , Fig.13 and Fig.14 The differential capacitive sensor assembly 43 for measuring the milk full state is included, and the differential capacitive sensor assembly 43 includes an electrode 431 and an electrode 432.

[0226] In one description, the differential capacitive sensor assembly 43 is disposed on the main body 33 of the host 30 at a position close to the top of the milk storage container 20. Specifically, it is disposed in the sensor setting layer 37 in the main body 33 at a position close to the top of the milk storage container 20, and is used to detect whether there is milk on the top of the milk storage container 20, so as to determine whether the milk storage container 20 is full of milk or not full of milk. In another description, the differential capacitive sensor assembly 43 is disposed on one side of the mounting hole 32 close to the top of the milk storage container 20, specifically, in the sensor setting layer 37 on one side of the mounting hole 32 close to the top of the milk storage container 20.

[0227] In another possible implementation, see Fig.15 , Fig.15 The differential capacitive sensor assembly 44 for measuring the milk full state includes an electrode 441 and an electrode 442. The differential capacitive sensor assembly 44 is disposed in the top seat 35 of the host 30, and is used to detect whether there is milk on the top of the milk storage container 20, so as to determine whether the milk storage container 20 is full of milk or not full of milk.

[0228] In some cases, such as Fig.15 As shown, the differential capacitive sensor assembly 44 is disposed on the upper side of the sensor setting layer 37 in the top seat 35. In other cases, the differential capacitive sensor assembly 44 is disposed on the lower side of the sensor setting layer 37 in the top seat 35. You can choose according to the actual situation, and this application does not limit it.

[0229] It should be noted that the differential capacitive sensor components in the above-mentioned figures are all arranged in the sensor setting layer 37, but this should not be understood as a limitation on the present application. In other embodiments, the differential capacitive sensor components can also be arranged in the remaining setting areas in the same or similar manner.

[0230] The differential capacitive sensor component is used to detect the milk fullness of the milk storage container, which is not easily affected by milk sticking to the wall, liquid level fluctuations, etc., and has high detection accuracy.

[0231] The following describes the setting method of the differential capacitive sensor component for measuring the unit height milk detection value.

[0232] As an example, the capacitance value of a capacitive sensor is proportional to the dielectric constant of the medium, which may change with temperature. Therefore, when the ambient temperature changes, the capacitance value of the sensor will also change accordingly, resulting in measurement errors.

[0233] As another example, when a human body approaches or contacts a capacitive sensor, the human body itself can be regarded as a conductor and has a certain dielectric constant. The presence of the human body changes the dielectric properties of the space around the capacitive sensor, causing the actual dielectric constant to change. At the same time, the human body may also increase the effective plate area of ​​the sensor or reduce the equivalent plate distance, thereby changing the detection value of the capacitive sensor.

[0234] As another example, since the dielectric constant of each mother's milk is different, when mother A uses a breast pump, the liquid level of the milk in the breast pump rises by 1 cm, and the detection value of the differential capacitance sensor assembly changes by 1 unit capacitance value. When mother B uses a breast pump with the same structure, if the dielectric constant of mother B's milk is greater than that of mother A's milk, the liquid level of the milk in the breast pump may rise by 1 cm, and the detection value of the differential capacitance sensor assembly may change by 1.1 unit capacitance value. Now, breast pumps generally calculate the amount of milk based on the detection value according to a preset mapping relationship. Therefore, if the preset mapping relationship is that a change of 1 unit capacitance value in the detection value corresponds to a change of 1 cm in the liquid level, then for mother B, the liquid level measured by the breast pump will always be higher than the actual height.

[0235] Therefore, it is necessary to detect the unit height milk detection value to eliminate the interference caused by the above-mentioned interference factors on the measurement of milk volume or liquid level.

[0236] Therefore, in order to ensure the detection accuracy, it is necessary to test the detection value of milk per unit height.

[0237] In some embodiments, the differential capacitive sensor assembly for detecting a unit height value of milk is disposed in a location close to the bottom of the milk storage container 20 in the setting area.

[0238] In other embodiments, the differential capacitive sensor assembly for detecting the detection value of the unit height of milk is disposed in a location close to the top of the milk storage container 20 in the setting area.

[0239] Among them, when the liquid level is not within the detection range of the differential capacitance sensor assembly, the differential capacitance sensor assembly is almost unaffected by the change in the liquid level. At this time, the detection value of the differential capacitance sensor assembly can be used as a unit height milk detection value. Therefore, the differential capacitance sensor assembly is arranged at a position close to the bottom of the milk storage container 20 in the setting area and can play the function of detecting the unit height milk detection value faster than being arranged at other positions.

[0240] However, if the setting area includes differential capacitive sensor components located near the bottom of the milk storage container 20 and near the top of the milk storage container 20, the differential capacitive sensor component located near the top of the milk storage container 20 in the setting area can mutually verify the unit height milk detection value with the differential capacitive sensor component located at the bottom of the milk storage container 20, thereby improving the detection accuracy.

[0241] Furthermore, the differential capacitive sensor assembly for detecting the unit height milk detection value in the present application can also be set in a position close to the middle of the milk storage container in the detection area. When set near the middle of the milk storage container, the differential capacitive sensor assembly can still be used to detect the unit height milk detection value.

[0242] Further, it can be seen that the configuration of the differential capacitive sensor assembly for measuring the unit height milk detection value is the same as some configurations of the differential capacitive sensor assembly for detecting the empty milk state and the full milk state. Therefore, in some cases, one differential capacitive sensor assembly can be used in the present application to simultaneously detect the empty milk state and the unit height milk detection value. In other cases, one differential capacitive sensor assembly can be used in the present application to simultaneously detect the full milk state and the unit height milk detection value.

[0243] See also Fig.17 , Fig.17 This is a detection principle diagram of a differential capacitive sensor assembly for simultaneously detecting an empty milk state and a unit height milk detection value provided by an embodiment of the present application. The reference sensor is defined as the sensor for detecting a unit height milk detection value.

[0244] like Fig.13 and Fig.17 As shown, the second differential capacitive sensor assembly 42A includes a first electrode 421A and a second electrode 422A, and the liquid level detection range of the second differential capacitive sensor assembly 42A only covers a partial area at the bottom of the milk storage space.

[0245] Therefore, when there is no milk in the milk storage space, as milk enters, the detection value of the differential capacitance sensor component 42A will change, but once the liquid level is higher than the maximum height of the liquid level detection range, the change in the liquid level will not cause a significant change in the detection value of the differential capacitance sensor component 42A. It can be considered that when the liquid level is higher than the liquid level detection range of the differential capacitance sensor component 42A, the change in the liquid level cannot affect the capacitance value of the differential capacitance sensor component 42A.

[0246] Furthermore, because the liquid level detection range that the differential capacitance sensor assembly 42A can detect is known, when the liquid level is higher than the liquid level detection range of the differential capacitance sensor assembly 42A, the unit height milk detection value can be obtained by dividing the detection value by the liquid level detection range. For example, if the liquid level detection range is 0-0.5cm and the detection value is 3mF, then the unit height milk detection value = 3mF / 0.5cm = 6mF / cm.

[0247] As a further example, if the working sensor and the reference sensor have the same detection value when detecting the same dielectric constant liquid at the same height, Therefore, as long as the working sensor is calibrated in advance (the working sensor is, for example, Fig.13 By using the relative relationship between the detection values ​​of the differential capacitive sensor component 41) used to detect the amount of milk or the liquid level and the reference sensor when detecting the liquid with the same dielectric constant at the same height, the detection value of the working sensor can be calibrated according to the detection value of the reference sensor, thereby eliminating the interference in the measurement of the amount of milk or the liquid level, as well as the interference of the different dielectric constants of the mother's milk and factory errors, and improving the measurement accuracy.

[0248] It is understandable that the working sensor is not limited to the differential capacitive sensor assembly 41 for detecting the amount of milk or the height of the liquid level, and any sensor that is subject to the same interference as the reference sensor can be the working sensor.

[0249] It is understood that when the liquid level is at a reference sensor, such as Fig.17 When the liquid level changes within the detection range of the differential capacitive sensor component 42A, due to the uncertainty of the dielectric constant, the unit height milk detection value cannot be determined based on the detection value of the differential capacitive sensor component, and it is necessary to wait for the liquid level to rise to a level higher than or equal to the liquid level detection range.

[0250] Therefore, the differential capacitance sensor assembly used to detect the unit height milk detection value sets the detectable liquid level detection range to be smaller.

[0251] Furthermore, the liquid level detection range of the differential capacitive sensor assembly 42A can be adjusted by adjusting the spacing between the first electrode 421A and the second electrode 422A, or the distance between the first electrode 421A and the second electrode 422A and the bottom of the milk storage container 20 .

[0252] The following will describe in detail the configuration of the differential capacitive sensor assembly for measuring the unit height milk detection value in conjunction with the embodiments.

[0253] In some embodiments, Fig.14 As shown in the figure, the differential capacitance sensor assembly for measuring the unit height milk detection value is the differential capacitance sensor assembly 42B, and the differential capacitance sensor assembly 42B is arranged at a position of the main body 33 close to the bottom of the milk storage container 20. The electric field lines of the differential capacitance sensor assembly 42B pass through the bottom of the milk storage container, and the differential capacitance sensor assembly 42B is used to detect both the empty milk state and the unit height milk detection value.

[0254] In other embodiments, Fig.13 and Fig.14 As shown in the figure, the differential capacitance sensor assembly for measuring the unit height milk detection value is a differential capacitance sensor assembly 43, and the differential capacitance sensor assembly 43 is arranged at a position of the main body 33 close to the top of the milk storage container 20. The electric field lines of the differential capacitance sensor assembly 43 pass through the top of the milk storage container 20, and the differential capacitance sensor assembly 43 can be used to detect the milk full state and the unit height milk detection value.

[0255] In some other embodiments, Fig.13 and Fig.15 As shown in the figure, the differential capacitance sensor assembly for measuring the unit height milk detection value is a differential capacitance sensor assembly 42A, and the differential capacitance sensor assembly 42A is disposed in the base 34. The electric field lines of the differential capacitance sensor assembly 42A penetrate the bottom of the milk storage container 20, and the differential capacitance sensor assembly 42A can be used to detect the empty milk state and the unit height milk detection value.

[0256] In some other embodiments, Fig.13 and Fig.15 As shown, the differential capacitance sensor assembly for measuring the unit height milk detection value is a differential capacitance sensor assembly 44, and the differential capacitance sensor assembly 44 is disposed in the top seat 35. The electric field lines of the differential capacitance sensor assembly 44 pass through the top of the milk storage container 20, and the differential capacitance sensor assembly 44 can be used to detect the milk full state and the unit height milk detection value.

[0257] Traditional inductive capacitive sensors are susceptible to external interference. A common situation is that when the mother's hand touches the breast pump while pumping milk, the capacitance changes, causing the inductive capacitive sensor to erroneously output a high-level signal. The differential capacitive sensor assembly in the present application can be used to detect the unit height milk detection value and calibrate the detection value of the working sensor. Compared with the existing technology, it can increase the detection accuracy and prevent misjudgment caused by various interferences to a large extent, making the capacitive sensing method more practical in breast pumps.

[0258] The above describes the setting areas, setting methods and embodiments of differential capacitive sensor components with different functions. The following describes the combined setting methods of multiple groups of differential capacitive sensor components for detecting different state parameters.

[0259] Optionally, the breast pump includes: at least one differential capacitive sensor component selected from the group consisting of a differential capacitive sensor component for detecting the amount of milk in a milk storage container, a differential capacitive sensor component for detecting the liquid level in a milk storage container, a differential capacitive sensor component for detecting an empty milk state, a differential capacitive sensor component for detecting a full milk state, and a capacitive sensor component for detecting a detection value of milk per unit height, and there is at least one of each differential capacitive sensor component.

[0260] The following will describe in detail the combination and arrangement of multiple groups of differential capacitance sensor components for detecting different state parameters in conjunction with the embodiments. Figures 18 to 22 , Figures 18 to 22 This is a different combination setting method of multiple groups of differential capacitive sensor components provided in the embodiments of the present application.

[0261] Fig.18 and Fig. 22 In the above description, the host housing 31 is used as the setting area, but the present application is not limited thereto. In some cases, the same setting method can be set in different setting areas. In other cases, multiple groups of differential capacitive sensor components are respectively set in different setting areas. After all the differential capacitive sensor components are projected onto the host housing 31, the display is Figures 18 to 22 The combination settings are shown in . Figures 18 to 22 The illustrated embodiment should not be construed as limiting the differential capacitive sensor assembly of the present application to being disposed in the host housing 31 .

[0262] Figures 18 to 22 In the embodiment, the main body housing 31 is divided into three areas along the rising direction of the milk liquid level, namely the bottom area C, the middle area B and the top area A. The above division method can be applied to the remaining setting areas.

[0263] In some cases, the maximum height of the bottom area C is less than or equal to the preset percentage multiplied by the maximum liquid level, and the minimum height of the top area A is greater than or equal to the preset percentage multiplied by the maximum liquid level. As an example, the preset percentage can be 30%, 25%, etc., which is not limited in this application.

[0264] In other cases, the maximum height of the bottom area C is less than or equal to the first preset height, and the minimum height of the top area A is greater than or equal to the second preset height. As an example, the first preset height and the second preset height can both be 5 cm, 6 cm, etc., which is not limited in this application.

[0265] As an optional manner, the detection electrode assembly of the differential capacitive sensor assembly for detecting the full milk state is arranged in the top area A. As another optional manner, the detection electrode assembly of the differential capacitive sensor assembly for detecting the empty milk state is arranged in the bottom area C. As another optional manner, the detection electrode assembly of the differential capacitive sensor assembly for detecting the milk volume or liquid level range is arranged in at least two areas of the bottom area C, the top area A and the middle area B. As another optional manner, the detection electrode assembly of the differential capacitive sensor assembly for detecting the unit height milk detection value is arranged in one of the bottom area C, the top area A and the middle area B.

[0266] In one possible implementation, Fig.18 As shown, Fig.18 The differential capacitance sensor assembly 45A, the differential capacitance sensor assembly 46A, and the differential capacitance sensor assembly 47A include: differential capacitance sensor assembly 45A includes electrode 451A and electrode 452A, differential capacitance sensor assembly 46A includes electrode 461A and electrode 462A, and differential capacitance sensor assembly 47A includes electrode 471A and electrode 472A.

[0267] The differential capacitive sensor assembly 45A is used to detect the liquid level or the amount of milk. Optionally, the differential capacitive sensor assembly 45A is also used to detect the empty milk state. Optionally, the differential capacitive sensor assembly 45A is also used to detect the full milk state.

[0268] The differential capacitance sensor assembly 46A is used to detect at least one of a unit height milk detection value and an empty milk state.

[0269] The differential capacitive sensor assembly 47A is used to detect at least one of a unit height milk detection value and a milk full state.

[0270] Define the rising direction of the milk liquid level as the vertical direction, then in the horizontal direction, Fig.18The middle electrode 461A and the electrode 462A are arranged between the electrode 451A and the electrode 452A. The electrode 471A and the electrode 472A are arranged between the electrode 451A and the electrode 452A. At this time, the differential capacitance sensor assembly 45A can fully detect the change in the liquid level during the process from empty milk to full milk.

[0271] And when the breast pump changes from an empty milk state to a full milk state, the differential capacitance sensor assembly 45A and the differential capacitance sensor assembly 46A simultaneously detect the capacitance change, and there are two differential capacitance sensor assemblies that can detect the empty milk state. Similarly, when the breast pump changes from a non-full milk state to a full milk state, the differential capacitance sensor assembly 45A and the differential capacitance sensor assembly 47A simultaneously detect the capacitance change, and there are two differential capacitance sensor assemblies that can detect the full milk state. This can improve the accuracy of the empty milk or full milk detection.

[0272] In another possible implementation, Fig.19 As shown, Fig.19 The differential capacitance sensor assembly 45B, the differential capacitance sensor assembly 46B and the differential capacitance sensor assembly 47B are included. The differential capacitance sensor assembly 45B includes an electrode 451B and an electrode 452B, the differential capacitance sensor assembly 46B includes an electrode 461B and an electrode 462B, and the differential capacitance sensor assembly 47B includes an electrode 471B and an electrode 472B.

[0273] The differential capacitive sensor assembly 45B is used to detect the liquid level or the amount of milk.

[0274] The differential capacitance sensor assembly 46B is used to detect at least one of a unit height milk detection value and an empty milk state.

[0275] The differential capacitive sensor assembly 47B is used to detect at least one of a unit height milk detection value and a milk full state.

[0276] In the direction of rising milk level, Fig.19 The middle electrode 451B is disposed between the electrode 461B and the electrode 471B, and the electrode 452B is disposed between the electrode 462B and the electrode 472B.

[0277] Fig.19 In the configuration, the structural design among the differential capacitive sensor assembly 45B, the differential capacitive sensor assembly 46B and the differential capacitive sensor assembly 47B is more compact, and less configuration space can be reserved in the breast pump, which is beneficial to the structural design.

[0278] In another possible implementation, Fig. 20 As shown, Fig. 20The differential capacitance sensor assembly 48A, the differential capacitance sensor assembly 49A and the differential capacitance sensor assembly 47C include: the differential capacitance sensor assembly 48A includes the electrode 481A and the electrode 482A, the differential capacitance sensor assembly 49A includes the electrode 491A and the electrode 492A, and the differential capacitance sensor assembly 47C includes the electrode 471C and the electrode 472C.

[0279] The differential capacitance sensor assembly 48A is used to detect the liquid level or the amount of milk. Optionally, the differential capacitance sensor assembly 48A is also used to detect the full state of milk.

[0280] The differential capacitance sensor assembly 49A is used to detect the liquid level or the amount of milk. Optionally, the differential capacitance sensor assembly 49A is also used to detect the empty milk state.

[0281] The differential capacitive sensor assembly 47C is used to detect at least one of a unit height milk detection value and a milk full state.

[0282] Fig. 20 Two short differential capacitive sensor assemblies 48A and 49A are used to detect the entire liquid level change, and the accuracy is better than that of using a single differential capacitive sensor assembly to detect the entire liquid level change, which can improve the detection accuracy. In addition, a differential capacitive sensor assembly for empty milk detection is no longer separately provided, and the differential capacitive sensor assembly 49A is used for empty milk state detection, which saves installation space.

[0283] In another possible implementation, Fig.21 As shown, Fig.21 The differential capacitance sensor assembly 48B, the differential capacitance sensor assembly 49B and the differential capacitance sensor assembly 47D include: the differential capacitance sensor assembly 48B includes the electrode 481B and the electrode 482B, the differential capacitance sensor assembly 49B includes the electrode 491B and the electrode 492B, and the differential capacitance sensor assembly 47D includes the electrode 471D and the electrode 472D.

[0284] The differential capacitance sensor assembly 48B is used to detect the liquid level or the amount of milk. Optionally, the differential capacitance sensor assembly 48B is also used to detect the full state of milk.

[0285] The differential capacitance sensor assembly 49B is used to detect the liquid level or the amount of milk. Optionally, the differential capacitance sensor assembly 49B is also used to detect the empty milk state.

[0286] The differential capacitive sensor assembly 47D is used to detect a unit height milk detection value and / or a milk full state.

[0287] Fig.21In the configuration, the structural design among the differential capacitive sensor assembly 48B, the differential capacitive sensor assembly 49B and the differential capacitive sensor assembly 47D is more compact, and less configuration space can be reserved in the breast pump, which is beneficial to the structural design.

[0288] In another possible implementation, Fig. 22 As shown, Fig. 22 The differential capacitance sensor assembly 48C, the differential capacitance sensor assembly 49C, the differential capacitance sensor assembly 47E, and the differential capacitance sensor assembly 46C are included. The differential capacitance sensor assembly 48C includes electrodes 481C and 482C, the differential capacitance sensor assembly 49C includes electrodes 491C and 492C, the differential capacitance sensor assembly 47E includes electrodes 471E and 472E, and the differential capacitance sensor assembly 46C includes electrodes 461C and 462C.

[0289] The differential capacitance sensor assembly 48C is used to detect the liquid level or the amount of milk. Optionally, the differential capacitance sensor assembly 48C is also used to detect the full milk state.

[0290] The differential capacitance sensor assembly 49C is used to detect the liquid level or the amount of milk. Optionally, the differential capacitance sensor assembly 49C is also used to detect the empty milk state.

[0291] The differential capacitive sensor assembly 47E is used to detect a unit height milk detection value and / or a milk full state.

[0292] The differential capacitive sensor assembly 46C is used to detect a unit height milk detection value and / or an empty milk state.

[0293] Fig. 22 In the setting mode, the state parameters of each milk storage container are detected by two differential capacitive sensor components, which can ensure the detection accuracy. And the structure design is compact, which is conducive to structural design.

[0294] It can be understood that the above-mentioned configuration is only used for illustration, and the present application is not limited to the configuration in the above-mentioned implementation, and the above-mentioned embodiments should not be understood as limitations on the present application.

[0295] The second type of breast pump is described below.

[0296] See also Fig.23 , Fig.23 is a first stereoscopic view of a second type of breast pump provided in an embodiment of the present application, Fig.24 This is a first exploded view of the second type of breast pump provided in an embodiment of the present application.

[0297] like Fig.23 and Fig.24 As shown, the second breast pump 100 includes a breast shield 110 , a milk storage container 120 and a host 130 .

[0298] The breast shield 110 is used to cover a human breast and fit closely to the breast. The breast shield 110 includes a trumpet-shaped flange for fitting closely to the breast and a nipple receiving portion for receiving a nipple.

[0299] The milk storage container 120 is used to receive and store breast milk collected by the breast shield 110 , and the milk storage container 120 is in communication with the breast shield 110 .

[0300] Optionally, the milk storage container 120 includes a milk bowl, a milk bottle, etc., which is not limited in the present application.

[0301] The host 130 includes a negative pressure mechanism and a housing. The negative pressure mechanism can directly or indirectly apply negative pressure to the breast shield 110 to pump breast milk into the milk storage container 120.

[0302] In the present application, directly or indirectly applying negative pressure to the breast shield refers to: preferably, using a method of indirectly applying negative pressure to the breast shield, the indirect application of negative pressure is usually used for an air pump that generates negative pressure to be connected to a diaphragm or air bag that separates gas and liquid through an air path, and the negative pressure is transmitted to the breast shield through the deformation of the diaphragm or air bag. This can prevent milk from being sucked into the negative pressure pump, contaminating the milk, and damaging the air pump or the circuit; directly generating negative pressure on the breast shield refers to a method in which the air pump is directly connected to the breast shield through an air path, and directly sucks and applies negative pressure to the inside of the breast shield. This method is a secondary method.

[0303] Optionally, the negative pressure mechanism includes but is not limited to a piezoelectric pump, a diaphragm pump, a hydraulic pump, a mechanical pump, etc.

[0304] In one possible implementation, the negative pressure mechanism may be directly connected to the breast shield 110 to cause negative pressure inside the breast shield 110. In another possible implementation, the negative pressure mechanism transmits the negative pressure to a liquid barrier such as a diaphragm or an air bag to indirectly cause negative pressure inside the breast shield 110, for example Fig.13 The medium negative pressure mechanism indirectly causes negative pressure inside the breast shield 110 via the diaphragm.

[0305] Optionally, the negative pressure mechanism is at least partially disposed in the shell, and the shell may also include components such as an energy supply module, a negative pressure air circuit, a control circuit board, and a solenoid valve.

[0306] Please refer to Fig.25 , Fig.25 Schematic diagram of the main unit of the second type of breast pump provided in the embodiment of the present application. Fig.25As shown, the housing 131 of the host 130 includes: a shell 1311 attached to the milk storage container 120 , and a shell 1312 attached to the milk storage container 120 and extending toward the milk storage container 120 .

[0307] Fig.25 The middle housing 1311 can be regarded as the bottom wall of the host 130 .

[0308] Fig.25 The middle shell 1312 only extends to a position close to the top of the milk storage container 120. In some cases, the shell 1312 can extend to a position close to the bottom of the milk storage container 120. In other cases, the shell 1312 can extend to a position that fits the bottom of the milk storage container 120.

[0309] Please refer to Fig.26 and Fig. 27 , Fig.26 This is a first schematic diagram of a milk storage container of a second type of breast pump provided in an embodiment of the present application. Fig. 27 This is a second schematic diagram of a milk storage container of a second type of breast pump provided in an embodiment of the present application.

[0310] like Fig.26 and Fig. 27 As shown, the outer shell 124 of the milk storage container 120 includes a top wall 1241 , a side wall 1242 and a bottom wall 1243 .

[0311] In some embodiments, the differential capacitive sensor assembly is disposed on the outer side of the milk storage container shell that does not contact the milk. In other embodiments, the differential capacitive sensor assembly is disposed on the side of the outer side of the milk storage container shell that does not contact the milk and is away from the inside of the milk storage container.

[0312] As an example, in the second type of breast pump 100, the area where the differential capacitive sensor assembly can be arranged includes but is not limited to: 1. The top wall 1241 does not contact the outer side of the milk.

[0313] 2. The side wall 1242 does not contact the outer side of the milk.

[0314] 3. The bottom wall 1243 does not contact the outer side of the milk.

[0315] 4. The housing 1311 is close to the inner side of the milk storage container 120 or away from the outer side of the milk storage container 120.

[0316] 5. The housing 1312 is close to the inner side of the milk storage container 120 or away from the outer side of the milk storage container 120.

[0317] It is understandable that when the structure of the breast pump changes, the optional setting area will also change accordingly, and the optional setting area listed above should not be understood as a limitation made by the embodiment of the present application. The setting principle of the differential capacitive sensor component for detecting different parameters can be found in the description of the first type of breast pump 1, and will not be repeated here.

[0318] Optionally, the outer side of the top wall 1241 that does not contact the milk may be provided with a differential capacitive sensor assembly for detecting a unit height milk detection value and / or a milk full state, for example Fig.26 The differential capacitive sensor component 123 in the embodiment of the present invention includes an electrode 1231 and an electrode 1232 .

[0319] Optionally, the side wall 1242 near the top of the milk storage container 120 may be provided with a differential capacitive sensor assembly for detecting a unit height milk detection value and / or a milk full state. The side wall 1242 near the bottom of the milk storage container 120 may be provided with a differential capacitive sensor assembly for detecting a unit height milk detection value and / or an empty milk state. The side wall 1242 may be provided with a differential capacitive sensor assembly for detecting the milk volume or liquid level along the rising direction of the milk liquid level, for example Fig. 27 The differential capacitive sensor component 121 in the embodiment of the present invention includes an electrode 1211 and an electrode 1212 .

[0320] Optionally, the outer side of the bottom wall 1243 that does not contact the milk may be provided with a differential capacitive sensor assembly for detecting a unit height milk detection value and / or an empty milk state, for example Fig. 27 The differential capacitive sensor component 122 in the embodiment of the present invention includes an electrode 1221 and an electrode 1222 .

[0321] Optionally, Fig.25 The middle shell 1311 fits the top wall 1241 of the milk storage container 120 , so a differential capacitive sensor component for detecting a unit height milk detection value and / or a milk full state can be disposed in the shell 1311 .

[0322] Optionally, Fig.25 The middle shell 1312 extends to a position close to the top of the milk storage container 120, so a differential capacitive sensor assembly for detecting a unit height milk detection value and / or a milk full state can be set. However, in some cases, if the shell 1312 extends to a position close to the bottom of the milk storage container 120, a differential capacitive sensor assembly for detecting the milk volume or liquid level can be set along the rising direction of the milk liquid level. In other cases, if the shell 1312 extends to a position that fits the bottom of the milk storage container 120, a differential capacitive sensor assembly for detecting a unit height milk detection value and / or an empty milk state can be set.

[0323] Two breast pumps with different structures are listed above to introduce in detail the setting method of the differential capacitive sensor component, but the present application is not limited to the two breast pump structures listed above. The setting ideas disclosed in the present application can also be used to set the differential capacitive sensor component on other breast pump structures, such as a breast pump structure in which the host is connected to a milk storage container through a three-way component.

[0324] In the present application, after obtaining the detection value obtained by the differential capacitive sensor assembly, that is, the capacitance value of the parallel capacitor group in the differential capacitive sensor assembly, it is also necessary to calculate the state parameter of the milk storage container according to the detection value through a software algorithm.

[0325] The following describes how to calculate the status parameters of the milk storage container based on the detection values ​​through software algorithms.

[0326] Calculation of empty milk status: In some embodiments, when the detection value of the differential capacitive sensor assembly for detecting the empty milk state is greater than the preset empty milk value, the milk storage container is considered to be in an empty milk state, otherwise it is considered to be in a non-empty milk state. In some cases, the preset empty milk value is the detection value measured when the milk storage container is empty when leaving the factory. In other cases, the preset empty milk value is the detection value measured when the milk storage container is empty when leaving the factory plus the preset value, so as to avoid the fluctuation of the detection value caused by some interference and cause the judgment failure. The specific value of the preset value can be selected according to the actual situation, and this application does not limit it.

[0327] In other implementations, the processing unit may send the detection value to a terminal such as a server or a mobile phone, and the terminal such as the server or the mobile phone may perform calculations to obtain the empty milk status.

[0328] Calculation of the full milk state: In some embodiments, when the detection value of the differential capacitive sensor assembly for detecting the full milk state is greater than the preset milk full value, the milk storage container is considered to be full of milk, otherwise it is not full of milk. In some cases, the preset milk full value is the detection value measured when the milk storage container is full of milk when leaving the factory. In other cases, the preset milk full value is the detection value measured when the milk storage container is full of milk when leaving the factory plus the preset value, so as to avoid the fluctuation of the detection value caused by some interference and cause the judgment failure. The specific value of the preset value can be selected according to the actual situation, and this application does not limit it.

[0329] In other implementations, the processing unit may send the detection value to a terminal such as a server or a mobile phone, and the terminal such as the server or the mobile phone may perform calculations to obtain the milk fullness status.

[0330] Calculation of milk volume or liquid level: In some embodiments, the processing unit may call a preset mapping relationship indicating the correspondence between the detection value and the milk volume or liquid level, and determine the milk volume or liquid level according to the detection value and the preset mapping relationship. The preset mapping relationship may be a data structure such as a table, an array, a queue, or a stack, and this application does not limit this.

[0331] In other embodiments, the processing unit may send the detection value to a terminal such as a server or a mobile phone, and the terminal such as the server or the mobile phone may perform calculations to obtain the milk volume or the liquid level.

[0332] About the calculation of the unit height milk detection value: In some embodiments, the detection value of the differential capacitive sensor assembly for detecting the unit height milk detection value divided by the detection height is equal to the unit height milk detection value. As an example, if the differential capacitive sensor assembly can measure the change in liquid level within the range of 8 cm to 10 cm, the detection height is 10 cm-8 cm=2 cm.

[0333] In other embodiments, after the detection value of the differential capacitance sensor assembly for detecting the unit height milk detection value is divided by the detection height, it needs to be processed in a preset manner, such as multiplying by a correction coefficient, or adding or subtracting a preset correction value.

[0334] As an example, if the liquid level detection range of the differential capacitance sensor assembly is 8-10 cm, when the liquid level is higher than 10 cm or lower than 8 cm, the detection value of the differential capacitance sensor assembly will be slightly disturbed by the change in the liquid level. The correction coefficient or preset correction value can be calculated based on the above interference. About the application of unit height milk detection value: The differential capacitive sensor component for detecting the detection value of the unit height of milk is defined as the reference sensor. The working sensor is defined as the differential capacitive sensor component for detecting the state parameters of the remaining milk storage containers, for example, the differential capacitive sensor component for detecting the full milk state or the empty milk state or the milk volume or the liquid level.

[0335] In some implementations, the actual detection value of the working sensor=the detection value of the working sensor / the detection value of milk per unit height.

[0336] In other embodiments, the actual detection value of the working sensor = f (the detection value of the working sensor, the detection value of the unit height of milk), and f (x) is a preset mapping function. The specific form of f (x) can be measured according to the actual product, and this application does not limit it.

[0337] The following describes in detail how to calculate the state parameters of the milk storage container based on the reference sensor in conjunction with the embodiments. Fig.18The embodiment shown is used as an example for description, and for the sake of brevity of description, Fig.18 The differential capacitive sensor assembly 45A in the figure is referred to as a first sensor, the differential capacitive sensor assembly 46A is referred to as a second sensor, and the differential capacitive sensor assembly 47A is referred to as a third sensor.

[0338] See also Fig.28 , Fig.28 It is a schematic diagram of the milk full state detection method provided in an embodiment of the present application. Fig.28 The third sensor is used to detect the full milk state, and the second sensor 46A is used to detect the empty milk state and the unit height milk detection value, such as Fig.28 As shown, the milk full state detection method 100 includes: steps 110 to 190.

[0339] Step 110: Acquire the detection value of the third sensor.

[0340] Step 120: Determine whether the detection value of the third sensor is greater than a preset milk full value.

[0341] For the explanation of the preset milk full value, please refer to the introduction in the above section, which will not be repeated here.

[0342] If the detection value of the third sensor is greater than the preset milk full value, then execute step 130. If the detection value of the third sensor is less than or equal to the preset milk full value, then return to execute step 110.

[0343] In one case, the reason why the detection value of the third sensor is greater than the preset milk full value is that the breast pump is indeed in an empty milk state. However, in other cases, the reason why the detection value of the third sensor is greater than the preset milk full value is due to external interference, such as human touch, user movement causing liquid level fluctuation, breast pump tilting causing liquid level tilt, etc. Therefore, it cannot be directly considered that the milk storage container is full of milk when the detection value of the third sensor is greater than the preset milk full value.

[0344] In some embodiments, in order to eliminate false alarms caused by liquid level tilt, a tilt sensor is installed on the breast pump to detect whether the breast pump is tilted. The tilt sensor is used to further improve the accuracy of milk full detection. In this case, step 120 includes the following steps.

[0345] (1) Determine whether the detection value of the third sensor is greater than a preset milk full value.

[0346] (2) When the detection value of the third sensor is greater than the preset milk full value and the detection result of the tilt sensor is not tilted, execute step 130.

[0347] (3) When the detection value of the third sensor is greater than the preset milk full value and the detection result of the tilt sensor is tilt, a preset operation is performed.

[0348] Optionally, the preset operation in step (3) includes but is not limited to at least one of the following: 1. Stopping the milk full detection for a preset time. 2. Sending an error prompt to the display interface of the breast pump. 3. Sending an error prompt to the user's terminal.

[0349] Step 130: Acquire the detection value of the second sensor.

[0350] Step 140: Determine whether the detection value of the second sensor is greater than a preset empty milk value.

[0351] For the explanation of the preset empty milk value, please refer to the introduction in the above section, which will not be repeated here.

[0352] The second sensor is used for both empty milk detection and unit height milk detection value. When the detection value of the second sensor is less than the preset empty milk value, it indicates that the milk storage container is empty of milk and cannot be full of milk.

[0353] If the detection value of the second sensor is greater than the preset empty milk value, step 150 is executed. If the detection value of the second sensor is less than or equal to the preset empty milk value, step 190 is executed.

[0354] Step 150: Determine whether the difference between the current detection value and the previous detection value of the second sensor is less than a preset difference.

[0355] Because the detection value of the second sensor is greater than the preset empty milk value, the sensitivity of the second sensor to the change of the liquid level is low at this time, so it can be considered that the detection value of the second sensor basically changes only due to external interference. Therefore, when the difference between the current detection value and the previous detection value of the second sensor is less than the preset difference, it means that the second sensor is not disturbed by the outside world or the external interference is very small. It can be considered that the third sensor is also not disturbed by the outside world or the external interference is very small, and step 160 is executed. When the difference between the current detection value and the previous detection value of the second sensor is greater than or equal to the preset difference, it means that the second sensor is subject to greater external interference, resulting in a sharp fluctuation in the detection value. It can be considered that the third sensor is also subject to stronger external interference. At this time, the error between the current detection value and the true detection value of the third sensor is large, and the detection value needs to be corrected, and step 170 is executed.

[0356] Step 160: Determine whether the milk storage container is full of milk.

[0357] Step 170: Calculate the milk detection value per unit height.

[0358] Optionally, the unit height milk detection value is equal to the current detection value of the second sensor divided by the detection height, but the present application is not limited to this. For details, please refer to the introduction in the above part of the specification, which will not be repeated here.

[0359] Step 180: Update the detection value of the second sensor according to the unit height milk detection value.

[0360] Please refer to the above part of the manual for an introduction to the calculation method of the actual detection value of the working sensor, which will not be repeated here.

[0361] Step 190: Determine whether the milk storage container is not full of milk.

[0362] It is understandable that the above method flow is not limited to being used in the third sensor, and its processing idea can be used in the working sensors for detecting other parameters of the milk storage container, for example, in the first sensor, and through steps 140 and 150, it can also be judged whether the first sensor is interfered by the outside world, and through steps 170 and 180, the real detection value of the first sensor can also be calculated, and it is only necessary to replace the parameters of the second sensor in step 180 with the parameters of the first sensor. Therefore, the above method embodiment is only used for illustration and should not be understood as limiting the present application.

[0363] In the above method, the second sensor is used as a reference sensor, the third sensor is used as a working sensor, interference judgment and detection value correction are performed on the third sensor, and the influence of various interferences on the working sensor can be effectively avoided.

[0364] The present application also provides a differential capacitive sensor assembly, which can be detachably mounted on a milk storage container of a breast pump and detect state parameters of the milk storage container.

[0365] The specific structure of the differential capacitive sensor assembly can be found in the description of any of the above embodiments, which will not be described in detail here.

[0366] Optionally, the differential capacitive sensor assembly includes a communication port for inserting a connecting line to communicate with the breast pump.

[0367] Optionally, the differential capacitive sensor assembly includes a wireless communication module, and the wireless communication module is used for wirelessly communicating with the breast pump.

[0368] In one possible implementation, the differential capacitance sensor assembly and the milk storage container have an interference fit. In another possible implementation, the differential capacitance sensor assembly and the milk storage container are mounted in a magnetic manner. In yet another possible implementation, the differential capacitance sensor assembly and the milk storage container are mounted in a snap-fit ​​manner. In yet another possible implementation, the differential capacitance sensor assembly and the milk storage container are mounted in a threaded manner. In yet another possible implementation, the elastic member on the differential capacitance sensor assembly is inserted into the jack of the milk storage container, and the position of the differential capacitance sensor assembly is fixed by the elastic force generated by the deformation of the elastic member. The above examples are for illustration only, and the present application does not limit the installation method of the differential capacitance sensor assembly and the milk storage container.

[0369] The present application also provides a breast pump, which includes: a milk storage container, a milk quantity detection capacitive sensor, a reference capacitive sensor and a processing unit; the milk storage container is used to store milk; the milk quantity detection capacitive sensor is used to obtain a first detection value, the first detection value includes a current milk quantity milk storage container capacitance detection value; the reference capacitive sensor is used to obtain a second detection value, the second detection value includes a unit height milk storage container capacitance detection value; the processing unit is used to determine a liquid level height value or a milk quantity value of the milk storage container corresponding to the milk quantity detection capacitive sensor according to the first detection value of the milk quantity detection capacitive sensor and the second detection value of the reference capacitive sensor.

[0370] The milk amount detection capacitive sensor is a capacitive sensor component for detecting the liquid level or the milk amount, for example, a differential capacitive sensor component for detecting the liquid level or the milk amount in any of the above embodiments.

[0371] Optionally, the current milk volume capacity detection value of the milk storage container is equal to the first detection value, and the first detection value is the capacitance value of the milk volume detection capacity sensor.

[0372] The reference capacitive sensor is a capacitive sensor component for detecting a detection value of milk per unit height, for example, a differential capacitive sensor component for detecting a detection value of milk per unit height in any of the above embodiments.

[0373] Optionally, the unit height milk detection value is equal to the second detection value, and the second detection value is the capacitance value of the reference capacitance sensor.

[0374] As an example, see Fig.18 The milk amount detection capacitive sensor may be the differential capacitive sensor assembly 45A in the above embodiment, and the reference capacitive sensor may be the differential capacitive sensor assembly 46A or the differential capacitive sensor assembly 47A in the above embodiment.

[0375] As another example, see Fig. 27The milk amount detection capacitive sensor may be the differential capacitive sensor component 121 in the above embodiment, and the reference capacitive sensor may be the differential capacitive sensor component 123 or the differential capacitive sensor component 122 in the above embodiment.

[0376] In some cases, in the direction of the milk level rising, the bottoms of the parallel capacitor groups of the milk volume detection capacitor sensor assembly and the reference capacitor sensor assembly are at the same height, and the top of the parallel capacitor group of the milk volume detection capacitor sensor assembly is higher than the top of the parallel capacitor group of the reference capacitor sensor assembly. Thus, the two have the same liquid level height or milk volume detection range, and when the liquid level height or milk volume is within the same liquid level height or milk volume detection range, the detection values ​​of the two can also verify each other to ensure the detection accuracy.

[0377] In other cases, in the direction of the milk level rising, the bottom of the parallel capacitor group of the milk volume detection capacitor sensor assembly is higher than the top of the parallel capacitor group of the reference capacitor sensor assembly, thereby saving the required layout space and making the structure compact.

[0378] Preferably, the milk quantity detection capacitive sensor assembly and the reference capacitive sensor assembly are arranged in the same arrangement area, so that the influence of various interferences on the detection values ​​of the milk quantity detection capacitive sensor assembly and the reference capacitive sensor assembly is as similar as possible.

[0379] By setting a reference capacitive sensor component, the detection value of the milk amount detection capacitive sensor component can be calibrated, thereby improving the detection accuracy of the milk amount detection capacitive sensor component and outputting more accurate milk amount data to the user. In addition, in order to prevent milk overflow, the breast pump needs to be controlled to shut down after the milk storage container is filled with milk. If there is no reference capacitive sensor component, the shutdown operation may be mistakenly triggered due to external interference, resulting in a poor user experience of the breast pump.

[0380] The present application also provides a breast pump, which includes: a milk storage container and a non-contact empty milk detection sensor assembly; the milk storage container is used to store milk; the empty milk detection sensor assembly is used to detect the empty milk state of the milk storage container; wherein the empty milk state includes an empty milk condition and a non-empty milk condition.

[0381] The empty milk detection sensor assembly is used to detect the empty milk state of the milk storage container. It can be understood that when the milk storage container is transformed from an empty milk state to a non-empty milk state, it means that milk enters the milk storage container, that is, the user starts to discharge milk.

[0382] Specifically, when the empty milk state is an empty milk situation, no milk is stored in the milk storage container or the amount of stored milk is less than a preset empty milk value; when the empty milk state is a non-empty milk situation, milk is stored in the milk storage container or the amount of stored milk is greater than or equal to the preset empty milk value.

[0383] In a possible implementation, the host 30 includes a host housing 31, and the empty milk detection sensor assembly includes a sensor unit, which is disposed on the host housing 31. The host housing 31 is mounted on the outer side of the milk storage container housing 21 or at least partially contacts the outer side of the milk storage container housing 21, and the sensor unit is close to or contacts the outer side of the milk storage container housing 21.

[0384] Wherein, when the empty milk detection sensor assembly is a capacitive sensor assembly, the sensor unit includes a capacitor unit in the capacitive sensor assembly; when the capacitive sensor assembly is a differential capacitive sensor assembly, the capacitor unit includes a detection electrode assembly of the differential capacitive sensor assembly. When the empty milk detection sensor assembly is a photoelectric sensor assembly, the sensor unit includes a light transmitter and a light receiver in the photoelectric sensor assembly. Thus, the empty milk state of the milk storage container is accurately detected by the sensor unit.

[0385] In another possible implementation, the empty milk detection sensor assembly is a capacitive sensor assembly, the host 30 includes a main body 33 extending along the rising direction of the milk liquid level, the milk storage container 20 includes a side wall extending along the rising direction of the milk liquid level, the main body 33 contacts or is close to the side wall, and the capacitive sensor assembly is arranged in the main body.

[0386] The side wall of the milk storage container 20 extending in the direction of the milk liquid level rising direction may be Figure 5 The second housing 212 is provided in the embodiment of the present invention.

[0387] In another possible implementation, the empty milk detection sensor assembly is a photoelectric sensor, at least a portion of the milk storage container 20 is a transparent or translucent shell, and the photoelectric sensor detects the empty milk state of the milk storage container through the transparent or translucent structure on the milk storage container 20.

[0388] Further, in this possible implementation, if the photoelectric sensor is disposed inside the host 30, at least a portion of the upper area of ​​the host housing 31 is a transparent or translucent shell, and the transparent or translucent shell in the host housing 31 corresponds to the position of the transparent or translucent shell in the milk storage container 20.

[0389] See also Figure 29 to Figure 30 , Fig.29 This is a first setting diagram of the photoelectric sensor provided in an embodiment of the present application. Fig.30 is a second schematic diagram of the photoelectric sensor provided in the embodiment of the present application. Fig.29 and Fig.30 As shown, the empty milk detection sensor component can also be a photoelectric sensor 51 or a photoelectric sensor 52.

[0390] exist Fig.29In the illustrated embodiment, the photoelectric sensor 51 is disposed on the base 34 and emits detection light toward the bottom of the milk storage container 20 and receives reflected light.

[0391] exist Fig.30 In the illustrated embodiment, the photoelectric sensor 52 is disposed at a position of the main body 33 close to the bottom of the milk storage container, and emits detection light toward the bottom of the milk storage container 20 and receives reflected light.

[0392] In some cases, the photoelectric sensor may be a reflective photoelectric sensor. When there is no liquid in the milk storage container, the reflected light intensity is low, and when there is liquid in the milk storage container, the reflected light intensity is high. The empty milk state can be determined based on the intensity of the reflected light. In other cases, the photoelectric sensor may also be a through-beam photoelectric sensor, a transmissive photoelectric sensor, or a scattering photoelectric sensor, which is not limited in the present application.

[0393] In another possible implementation, the empty milk detection sensor assembly is a pressure sensor, and the pressure sensor determines whether milk flows into the milk storage container by detecting an increase in pressure.

[0394] In the use scenario of a breast pump, mothers would like to know whether the breast pump has sucked out breast milk. By setting up an empty milk detection sensor component, it can be determined whether the breast pump is empty. If it is not empty, it means that breast milk has been sucked out, thereby reminding the mother that milk is currently being discharged. In addition, the detection of the empty milk state is crucial for operations such as switching the breast pump mode or automatically starting the machine.

[0395] In some cases, the milk sucked out by the breast pump flows into the milk storage container from the milk inlet, and the empty milk detection sensor assembly is correspondingly arranged at the milk inlet position of the milk inlet. Further, in the direction of rising milk level, the empty milk detection sensor assembly is at least partially arranged below the milk inlet.

[0396] As an example, the milk inlet may be a valve of a one-way valve, or an outlet of a milk inlet channel connecting a milk storage container and a breast shield.

[0397] Milk usually flows into the milk storage container by gravity, so the empty milk detection sensor assembly is at least partially arranged below the milk inlet, so that milk can be detected when milk flows into the milk storage container.

[0398] The following describes how to control the breast pump according to the empty milk state to improve the milking effect. Fig.31 , Fig.31 It is a flow chart of a method for controlling a breast pump provided in an embodiment of the present application.

[0399] like Fig.31 As shown, the control method 200 of the breast pump includes: step 210 to step 220.

[0400] Step 210: Acquire the detection value of the empty milk detection sensor assembly.

[0401] Wherein, the empty milk detection sensor component is a capacitive sensor component, and the detection value is the capacitance value of the capacitive sensor component.

[0402] Wherein, the empty milk detection sensor component is a photoelectric sensor component, and the detection value is a high level signal and a low level signal, or a voltage value, or a current value.

[0403] Step 220: When it is determined according to the detection value that the breast pump is not empty of milk, control the breast pump to switch from the first working mode to the second working mode.

[0404] In a possible implementation, step 220 includes: when it is determined according to the detection value that the breast pump is not empty of milk, controlling the breast pump to switch from a mode for stimulating milk secretion to a milk pumping mode.

[0405] Among them, the mode of stimulating milk secretion includes at least one function of simulating sucking function, hot compress function, vibration function, massage function, and electrical stimulation function.

[0406] The sucking simulation function simulates the frequency and rhythm of a baby's sucking to stimulate the mammary glands and promote milk secretion. The hot compress function promotes milk secretion by heating. The vibration function stimulates the breasts by generating slight vibrations. The massage function promotes milk secretion by massage. The electrical stimulation function stimulates the breasts by a weak electric current to promote milk secretion.

[0407] Furthermore, the mode for stimulating milk secretion may have multiple functions at the same time, for example, including a hot compress mode and a massage mode at the same time.

[0408] In another possible implementation, step 220 includes the steps of: when it is determined according to the detection value that the breast pump is not empty of milk, controlling the breast pump to switch from the first milk suction mode to the second milk suction mode; wherein at least one of the milk suction frequency and the milk suction force in the second milk suction mode is greater than that in the first breast pump mode.

[0409] By monitoring the empty milk state, you can improve milk pumping efficiency and avoid breast pain caused by strong milk pumping when there is no milk secretion.

[0410] The present application provides another breast pump, which includes: a milk storage container and a capacitive sensor assembly; the milk storage container is used to store the sucked milk; the capacitive sensor assembly is used to detect parameters of the milk storage container; the capacitive sensor assembly is arranged on the outer side of the milk storage container that does not contact the milk.

[0411] The capacitive sensor assembly may include the differential capacitive sensor assembly in any of the above embodiments.

[0412] In some embodiments, the differential capacitive sensor assembly is a first type differential capacitive sensor assembly for detecting an empty milk state and a unit height milk detection value of a milk storage container.

[0413] In the present application, a differential capacitive sensor component can have multiple functions, which can save the installation space in the breast pump and is conducive to the miniaturization and refinement of the breast pump.

[0414] The present application provides another breast pump, which includes: a milk storage container and multiple groups of capacitive sensor components; the milk storage container includes a milk storage container shell, the milk storage container shell includes an inner side surface contacting milk and an outer side surface not contacting milk; each group of capacitive sensor components includes a detection electrode component, each detection electrode component is arranged on the outer side surface or close to the outer side of the outer side surface. The multiple groups of capacitive sensor components detect different state parameters of the milk storage container.

[0415] The capacitive sensor assembly may include the differential capacitive sensor assembly in any of the above embodiments.

[0416] By setting up multiple groups of differential capacitive sensor components, the parameters of the milk storage container can be fully detected, thereby improving the user experience and the intelligentization of the breast pump.

[0417] The present application provides another breast pump, which includes: a milk storage container and three groups of differential capacitive sensor components; the first group of differential capacitive sensor components includes a first detection electrode component, and the first detection electrode component is arranged in the bottom area in the direction of rising milk level in the milk storage container; the second group of differential capacitive sensor components includes a second detection electrode component, and the second detection electrode component is arranged in the top area in the direction of rising milk level in the milk storage container; the third group of differential capacitive sensor components includes a third detection electrode component, and the third detection electrode component extends from the bottom area to the top area in the direction of rising milk level in the milk storage container.

[0418] Among them, in the rising direction of the milk level in the milk storage container, the height of the bottom of the third detection electrode assembly is lower than or equal to the height of the top of the first detection electrode assembly, and the height of the top of the third detection electrode assembly is higher than or equal to the height of the bottom of the second detection electrode assembly.

[0419] Among them, the first group of differential capacitive sensor components is used to detect the full milk state of the milk storage container; the second group of differential capacitive sensor components is used to detect at least one of the empty milk state and the unit height milk detection value of the milk storage container; the third group of differential capacitive sensor components is used to detect the amount of milk in the milk storage container or the liquid level in the milk storage container.

[0420] For details, see Fig.18The relevant descriptions in any embodiment will not be repeated here.

[0421] Exemplarily, in this embodiment, the first differential capacitive sensor component may be Fig.18 The differential capacitive sensor assembly 46A in the embodiment of the present invention may be a second differential capacitive sensor assembly. Fig.18 The differential capacitive sensor assembly 47A in the embodiment of the present invention may be a third differential capacitive sensor assembly. Fig.18 The differential capacitive sensor assembly 45A in FIG.

[0422] The present application provides another breast pump, which includes a milk storage container and three groups of differential capacitive sensor assemblies; the first group of differential capacitive sensor assemblies includes a first detection electrode assembly, and the first detection electrode assembly is arranged in the top area in the direction of rising milk level in the milk storage container; the second group of differential capacitive sensor assemblies includes a second detection electrode assembly, and the second detection electrode assembly extends from the bottom area to the middle area in the direction of rising milk level in the milk storage container; the third group of differential capacitive sensor assemblies includes a third detection electrode assembly, and the third detection electrode assembly extends from the middle area to the top area in the direction of rising milk level in the milk storage container.

[0423] Wherein, in the direction of the milk liquid level rising, the height of the bottom of the third detection electrode assembly is higher than the height of the top of the second detection electrode assembly.

[0424] Among them, the first group of differential capacitive sensor components is used to detect the milk full state of the milk storage container; the second group of differential capacitive sensor components is used to detect the milk volume within a first milk volume range or the liquid level within a first liquid level range of the milk storage container; the third group of differential capacitive sensor components is used to detect the milk volume within a second milk volume range or the liquid level within a second liquid level range of the milk storage container.

[0425] For details, see Fig.21 The relevant descriptions in any embodiment will not be repeated here.

[0426] Exemplarily, in this embodiment, the first differential capacitive sensor component may be Fig.21 The differential capacitive sensor assembly 47D in the embodiment of the present invention may be a second differential capacitive sensor assembly. Fig.21 The differential capacitive sensor assembly 48B in the embodiment of the present invention may be a third differential capacitive sensor assembly. Fig.21 Capacitive sensor 49B in.

[0427] The present application provides a breast pump, comprising: a milk storage container and three groups of differential capacitive sensor components; the first group of differential capacitive sensor components comprises a first detection electrode component, and the first detection electrode component is arranged in the top area in the direction of the rising milk level in the milk storage container; the second group of differential capacitive sensor components comprises a second detection electrode component, and the second detection electrode component is arranged in the bottom area in the direction of the rising milk level in the milk storage container; the third group of differential capacitive sensor components comprises a third detection electrode component, and the height of the top of the third detection electrode component is lower than the height of the first detection electrode component, and the height of the bottom of the third detection electrode component is higher than the height of the second detection electrode component in the direction of the rising milk level in the milk storage container.

[0428] Wherein, in the direction of rising of the milk liquid level, the third detection electrode assembly extends from the bottom area to the top area.

[0429] Among them, the first group of differential capacitive sensor components is used to detect the full milk state of the milk storage container; the second group of differential capacitive sensor components is used to detect at least one of the empty milk state and the unit height milk detection value of the milk storage container; the third group of differential capacitive sensor components is used to detect the amount of milk in the milk storage container or the liquid level in the milk storage container.

[0430] For details, see Fig.19 The relevant descriptions in any embodiment will not be repeated here.

[0431] Exemplarily, the first group of differential capacitive sensor components is Fig.19 The differential capacitive sensor assembly 47B in the second group of differential capacitive sensor assemblies is Fig.19 The differential capacitive sensor assembly 46B in the third group of differential capacitive sensor assemblies is Fig.19 The differential capacitive sensor component 45B in.

[0432] The capacitive sensor assembly in the present application is not limited to an integrated breast pump in which the host and the milk bowl are integrated, but can also be implemented in a split breast pump configuration in which the host and the milk storage container are not integrated or not fully integrated. The split breast pump includes two categories: In the first category, a milk pump assembly formed by a breast shield and a milk storage container is integrated on the chest and connected to an external main unit with an air pump or a handheld main unit with an air pump through a flexible air tube; the flexible air tube is usually connected to the milk storage container through a connecting cover to directly or indirectly transmit negative pressure to the breast shield or the milk storage container. Preferably, the capacitive sensor assembly or differential capacitive sensor assembly in the above embodiments can be integrated on the cover, or the capacitive sensor assembly or differential capacitive sensor assembly is an independent detachable accessory that is detachably connected to the milk storage container and transmitted to the main unit through wires or wireless signals.

[0433] See also Fig.32 , Fig.32 Schematic diagram of the structure of the third type of breast pump provided in the embodiment of the present application. Fig.32 As shown, Fig.32 The invention comprises: a milk pumping assembly 310 and a host 320 , wherein the milk pumping assembly 310 further comprises a breast shield (not shown in the figure), a milk storage container 311 and a negative pressure cabin cover 312 .

[0434] The main unit 320 and the negative pressure cabin cover 312 are connected via a flexible air tube so as to directly or indirectly transmit the negative pressure to the breast shield.

[0435] Further, Fig.32 The main unit 320 also includes a three-way connector 330, through which a plurality of milk suction components can be connected, thereby providing negative pressure to the plurality of milk suction components simultaneously or individually.

[0436] in, Fig.32 The sensor component 340 in the embodiment may be a capacitive sensor component or a differential capacitive sensor component. Fig.32 The sensor assembly 340 is integrated into the milk storage container 311 , and the sensor assembly 340 is preferably detachably mounted to the milk storage container 311 .

[0437] However, in a possible implementation, the sensor assembly 340 may also be integrated into the negative pressure cabin cover 312 , and the sensor assembly 340 is preferably detachably mounted on the negative pressure cabin cover 312 .

[0438] In the second category, a milk suction assembly formed by a breast shield and a milk storage container is integrated on the chest, and a first host including an air pump is also integrated on the milk suction assembly. The first host directly or indirectly transmits negative pressure to the breast shield or the milk storage container. The first host is connected to an external second host via wires, and the second host includes a battery and a control panel. Preferably, the capacitive sensor assembly or differential capacitive sensor assembly in the above embodiments can be integrated on the first host, or the capacitive sensor assembly or differential capacitive sensor assembly is an independent detachable accessory detachably connected to the milk storage container, and transmitted to the second host via wires or wireless signals.

[0439] The air pump used in the present application includes but is not limited to a diaphragm pump, a piston pump, a piezoelectric pump, etc., and also includes other pumps or negative pressure drive methods that may be applied to a breast pump.

[0440] The shape of the breast pump in the embodiments of the present application is only for explanation, and the scope of protection of the present application is not limited to the shape of the breast pump in the embodiments.

[0441] In the description of this specification, the description with reference to the terms "in some embodiments", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0442] In addition, the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A breast pump, characterized in that: The breast pump comprises: a milk storage container for storing milk and a differential capacitive sensor assembly for detecting state parameters of the milk storage container; The milk storage container comprises a milk storage container shell, wherein the milk storage container shell comprises an inner side surface contacting the milk and an outer side surface not contacting the milk; The differential capacitive sensor assembly includes a detection electrode assembly, and the detection electrode assembly is arranged on the outer side surface or close to the outer side of the outer side surface.

2. The breast pump according to claim 1, characterized in that: The state parameter of the milk storage container includes at least one of the amount of milk in the milk storage container, the height of the liquid level in the milk storage container, an empty milk state, a milk state, a full milk state, and a milk liquid detection value per unit height.

3. The breast pump according to claim 1, characterized in that: The detection electrode assembly is detachably fixed to the outer side surface, or detachably fixed to the outer side close to the outer side surface.

4. The breast pump according to claim 1, characterized in that: The differential capacitive sensor assembly also includes a control circuit; The detection electrode assembly comprises at least one group of parallel capacitors arranged opposite to each other, and the parallel capacitors comprise a first electrode and a second electrode; The control circuit is at least used to charge the detection electrode assembly and detect the capacitance value of the detection electrode assembly.

5. The breast pump according to claim 4, characterized in that: The first electrode and the second electrode are sheet electrodes arranged in parallel, and the first electrode and the second electrode extend along the rising direction of the milk liquid level.

6. The breast pump according to claim 4, characterized in that: The breast pump further comprises a processing unit, the control circuit comprises a conversion unit, and the conversion unit comprises an excitation module, a sampling module and a conversion module; The excitation module generates a charging signal for charging the detection electrode assembly, and the charge on the detection electrode assembly is transmitted to the conversion module through the sampling module, and the conversion module converts the analog voltage into a digital signal; The processing unit is used to calculate the state parameter of the milk storage container corresponding to the differential capacitive sensor assembly according to the digital signal.

7. The breast pump according to claim 4, characterized in that: The distance between the first electrode and the second electrode is greater than the distance between the differential capacitance sensor assembly and the inner side surface of the milk storage container shell.

8. The breast pump according to claim 4, characterized in that: The breast pump further comprises a host, and the differential capacitive sensor assembly is arranged on the host.

9. The breast pump according to claim 8, characterized in that The host comprises a host housing, the detection electrode assembly is arranged on the host housing, the host housing is mounted on the outer side of the milk storage container housing or at least partially contacts the outer side of the milk storage container housing, and the detection electrode assembly is close to or contacts the outer side of the milk storage container housing.

10. The breast pump according to claim 9, characterized in that The host housing comprises an inner side surface close to the interior of the host and an outer side surface away from the interior of the host; The detection electrode assembly is arranged on the inner side surface of the host shell.

11. The breast pump according to claim 8, characterized in that The host further comprises a component setting layer and a sensor setting layer, wherein the sensor setting layer is arranged between the component setting layer and the host housing; The parallel capacitor group is arranged on the sensor arrangement layer.

12. The breast pump according to claim 11, characterized in that The sensor setting layer has an electric shielding effect, and the parallel capacitor group is arranged on a side of the sensor setting layer close to the host housing.

13. The breast pump according to claim 8, characterized in that The host comprises a main body extending in the direction of the rising liquid level of the milk and a base located below the bottom wall of the milk storage container, the milk storage container comprises a side wall extending in the direction of the rising liquid level of the milk and a bottom wall connected to the side wall; the main body contacts or is close to the side wall, and the base contacts or is close to the bottom wall; The milk storage container is installed above the base, and the detection electrode assembly includes at least one parallel capacitor group arranged on the base.

14. The breast pump according to claim 8, characterized in that The host comprises a main body extending in the direction of the rising liquid level of the milk and a top seat located above the top wall of the milk storage container, the milk storage container comprises a side wall extending in the direction of the rising liquid level of the milk and a top wall connected to the side wall; the main body contacts or is close to the side wall, and the top seat contacts or is close to the top wall; The milk storage container is installed below the top seat, and the detection electrode assembly comprises at least one parallel capacitor group arranged on the top seat.

15. The breast pump according to claim 8, characterized in that The main unit further includes a bottom wall, and the milk storage container further includes a top wall, and the bottom wall of the main unit is fixed to the top wall of the milk storage container; The detection electrode assembly includes at least one parallel capacitor group arranged on the bottom wall of the host.

16. The breast pump according to claim 8, characterized in that The detection electrode assembly is fixedly mounted on the outer surface of the milk storage container shell and is electrically connected to a control circuit mounted on the host.

17. The breast pump according to claim 4, characterized in that The detection electrode assembly includes a plurality of parallel capacitor groups arranged opposite to each other.

18. The breast pump according to claim 17, characterized in that The detection electrode assembly includes a first parallel capacitor group and a second parallel capacitor group, wherein the first parallel capacitor group is used to measure a first milk volume range or a first liquid level range; and the second parallel capacitor group is used to measure a second milk volume range or a second liquid level range.

19. The breast pump according to claim 4, characterized in that The differential capacitive sensor assembly at least comprises a milk full detection parallel capacitor group for measuring the milk full state of the milk storage container; The milk full detection parallel capacitor group is arranged near the top of the milk storage container.

20. The breast pump according to claim 4, characterized in that: The differential capacitive sensor assembly comprises at least an empty milk detection parallel capacitor group for measuring the empty milk state of the milk storage container; The empty milk detection parallel capacitor group is arranged near the bottom of the milk storage container.

21. The breast pump according to claim 4, characterized in that The differential capacitance sensor assembly at least comprises a unit height detection parallel capacitance group for detecting a unit height milk detection value; The unit height detection parallel capacitor group is arranged at the bottom of the milk storage container.

22. The breast pump according to claim 17, characterized in that The multiple groups of parallel capacitor groups are at least two groups of the milk quantity detection parallel capacitor group, the empty milk detection parallel capacitor group, the empty milk detection parallel capacitor group, and the unit height detection parallel capacitor group.

23. The breast pump according to claim 1, characterized in that The breast pump further comprises: a breast shield and a main unit, wherein the breast shield comprises a flange for fitting the breast; The milk storage container is used to receive and store breast milk collected by the breast shield, and the milk storage container is in communication with the breast shield; The host comprises a negative pressure mechanism, which is used to directly or indirectly apply negative pressure to the breast shield to pump breast milk into the milk storage container.

24. A differential capacitive sensor assembly, characterized in that: The differential capacitive sensor assembly can be detachably mounted on a milk storage container of a breast pump and detect state parameters of the milk storage container.

25. The differential capacitive sensor assembly according to claim 24, wherein: The differential capacitive sensor assembly includes a communication port for inserting a connecting line to communicate with a breast pump.

26. The differential capacitive sensor assembly of claim 24, wherein: The differential capacitive sensor assembly includes a wireless communication module, and the wireless communication module is used for wireless communication with the breast pump.

27. The differential capacitive sensor assembly of claim 24, wherein: The differential capacitive sensor assembly includes a detection electrode assembly and a control circuit; The detection electrode assembly comprises at least one group of parallel capacitors arranged opposite to each other, and the parallel capacitors comprise a first electrode and a second electrode; The control circuit is at least used to charge the detection electrode assembly and detect the capacitance value of the detection electrode assembly.

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