A breast pump with easy liquid level detection

Abstract

The utility model relates to a breast pump, specifically a breast pump convenient for liquid level detection, comprising a host assembly, a milk bowl assembly, a horn cover, a cover connecting piece for detachably connecting the host assembly and the milk bowl assembly, the cover connecting piece is provided with a liquid level sensing assembly for detecting the storage milk liquid level height, when the storage milk liquid level approaches the liquid level sensing assembly, the liquid level sensing assembly feeds back the liquid level change signal to the host assembly. The breast pump of the utility model is provided with the liquid level sensing assembly for detecting the storage milk liquid level height on the cover connecting piece, when the liquid level rises to approach the liquid level sensing assembly, the liquid level sensing assembly can feed back the liquid level approach change to the host assembly, so that the user can know the milk liquid suction condition, timely take down the breast pump to pour out the pumped and stored breast milk, and conveniently use.

Description

Technical Field

[0001] This utility model relates to a breast pump, specifically a breast pump that facilitates liquid level detection. Background Technology

[0002] Breast pumps are devices commonly used by women to collect breast milk during lactation. They utilize the principle of negative pressure suction to express and store breast milk, solving the problems of engorgement and breast milk storage, and facilitating breastfeeding for infants. Traditional breast pumps are generally divided into manual and electric types. Electric breast pumps typically consist of many components, including the main unit, tubing, breast shield, and storage bottle. These pumps are bulky and have many parts, and require the user to hold them while using them. Furthermore, the tubing restricts the mother's freedom of movement, making them very inconvenient to use. Therefore, wearable breast pumps that integrate all components have emerged on the market.

[0003] However, with existing wearable breast pumps, it is not easy for users to know the rise in the milk level in the storage area during the pumping process. Therefore, it is difficult to judge the time when the pumping is completed. Usually, users need to stop pumping, remove the breast pump, estimate the weight added to the breast pump to estimate the amount of milk pumped, or disassemble the breast pump to observe the actual amount of milk stored inside. However, this method is inconvenient for users to use and affects the pumping efficiency. Utility Model Content

[0004] Regarding the aforementioned problem that it is inconvenient to monitor the internal milk storage capacity of existing wearable breast pumps, the technical solution adopted by this utility model to solve this problem is: A breast pump for easy liquid level detection includes a main unit for performing negative pressure suction, a milk bowl assembly adapted to the main unit for collecting breast milk, a horn cover mounted on the milk bowl assembly for conforming to the user's skin, and a cover connector for detachably connecting the main unit and the milk bowl assembly. The cover connector is equipped with a liquid level sensor for detecting the height of the stored milk level. When the stored milk level approaches the liquid level sensor, the liquid level sensor sends a liquid level change signal back to the main unit.

[0005] As described above, a breast pump that facilitates liquid level detection includes a liquid level sensing component comprising a metal sensing plate for sensing the height of the stored milk liquid level and a metal probe for providing feedback on the height of the stored milk liquid level. The metal probe abuts against the metal sensing plate to detect and provide feedback on the liquid level change signal during milk storage to the main unit. The cover connector includes a main unit cover installed on the main unit assembly to form the inner cavity of the main unit, and a milk bowl cover installed on the milk bowl assembly to form the inner cavity of the milk bowl. The milk bowl cover has a milk storage channel structure that communicates with the inner cavity of the milk bowl.

[0006] As described above, in a breast pump designed for easy liquid level detection, the metal probe is a pogopin spring-loaded structure, and the metal sensing element is a capacitive sensor. The metal sensor is installed on the assembly surface a of the milk bowl cover for contacting the main unit cover. The assembly surface b of the main unit cover for contacting the milk bowl cover is provided with a probe through hole. After the main unit cover and the milk bowl cover are connected, the metal probe passes through the probe through hole and extends to abut against the metal sensor to detect changes in the liquid level during milk storage. The metal sensor is located between the middle and the top of the milk bowl lid. At least two metal sensors are arranged at the same horizontal height on the milk bowl lid. The surface of the metal sensor that is in contact with the metal probe is flush with the assembly surface a.

[0007] As described above, a breast pump that facilitates liquid level detection has a first concave cavity in the main unit cover and a second concave cavity in the milk bowl cover. After the main unit cover and the milk bowl cover are connected, the first concave cavity and the second concave cavity cooperate to form a sealed negative pressure inner cavity structure. The milk bowl lid has an air extraction channel that connects the second concave cavity and the milk storage channel structure. The air passage structure of the main unit is connected to the first concave cavity to draw air from the negative pressure inner cavity structure to form a negative pressure state.

[0008] As described above, a breast pump for easy liquid level detection includes a main unit comprising a suction pump for performing negative pressure suction, a battery for providing power, and a circuit board structure for operating the main unit. The suction pump is connected to the first concave cavity via an air pipe to draw air from the negative pressure inner cavity structure to create a negative pressure state. The air passage structure between the suction pump and the first concave cavity is provided with a solenoid valve for opening and closing the air passage. The first concave cavity is located near the top of the main unit's inner cavity, and the suction pump is located near the bottom of the main unit's inner cavity.

[0009] As described above, in a breast pump designed for easy liquid level detection, the hollow portion of the main unit is located between the first concave cavity and the air pump. The first concave cavity, the battery, the air pump, and the circuit board structure are arranged circumferentially around the hollow portion of the main unit within the main unit's inner cavity.

[0010] As described above, a breast pump that facilitates liquid level detection has a sealing ring structure on the outer side of the opening of the first concave cavity to improve the connection sealing effect, and a deformable suction bowl in the second concave cavity. After the main body cover and the milk bowl cover are connected, the sealing ring structure abuts against the surface of the suction bowl to form a sealed negative pressure inner cavity structure.

[0011] As described above, a breast pump that facilitates liquid level detection has an inclined protrusion on the mounting surface a of the milk bowl cover for contacting the main body cover, and a positioning groove on the mounting surface b of the main body cover for contacting the milk bowl cover for mounting with the positioning protrusion. The edge of the positioning groove has a sliding ramp that slopes from the mounting surface b toward the bottom of the groove.

[0012] As described above, a breast pump that facilitates liquid level detection includes a main unit assembly comprising a main unit housing that surrounds the main unit cover to form the main unit cavity, the milk bowl cover having an external threaded connection on its mounting surface a for contacting the main unit cover, and an internal threaded connection for engaging the external threaded connection in the hollow portion of the main unit housing. The flexible mounting part of the horn cover passes through the hollow part of the main unit housing and is installed at the milk inlet of the milk storage channel structure. The milk outlet of the milk storage channel structure is equipped with a one-way valve.

[0013] As described above, a breast pump for easy liquid level detection further includes a milk level light for illuminating and observing the milk storage liquid level, and a light fixture for mounting the milk level light on the main unit cover. The milk bowl assembly includes a milk bowl shell that surrounds the milk bowl cover to form the milk bowl cavity. The main unit cover has a light fixture mounting hole for the light to pass through. The light fixture, the milk bowl cover, and the milk bowl shell are all made of transparent material.

[0014] The beneficial effects of this utility model are as follows: The breast pump of this invention is equipped with a liquid level sensing component on the cover connector for detecting the height of the stored milk. When the liquid level rises to near the liquid level sensing component, the liquid level sensing component can feed back the change in liquid level to the main unit, allowing the user to know the milk extraction status and promptly remove the breast pump to pour out the stored breast milk, making it convenient for the user. Attached Figure Description

[0015] Figure 1 This is a perspective view of a breast pump that facilitates liquid level detection according to this utility model.

[0016] Figure 2 This invention relates to the internal structure of a breast pump that facilitates liquid level detection. Figure 1 .

[0017] Figure 3 This invention relates to the internal structure of a breast pump that facilitates liquid level detection. Figure 2 .

[0018] Figure 4 for Figure 2 A magnified view of A.

[0019] Figure 5for Figure 3 A magnified view of B.

[0020] Figure 6 Based on Figure 4 Demonstration of the suction action Figure 1 (Reset state).

[0021] Figure 7 Based on Figure 4 Demonstration of the suction action Figure 2 (Negative pressure state).

[0022] Figure 8 This invention provides a three-dimensional decomposition method for easy liquid level detection. Figure 1 .

[0023] Figure 9 This invention provides a three-dimensional decomposition method for easy liquid level detection. Figure 2 . Detailed Implementation

[0024] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The described embodiments are only some embodiments of the technical solution of this application, and not all embodiments. Based on the embodiments of the technical solution of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the technical solution of this application.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the technical solution of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0026] Furthermore, the descriptions involving "first," "second," etc., in the technical solutions of this application are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0027] Example 1 See Figures 1 to 9This embodiment illustrates a breast pump for easy liquid level detection, comprising a main unit assembly 1 for performing negative pressure suction, a milk bowl assembly 2 adapted to the main unit assembly 1 for collecting breast milk, a horn cover 3 mounted on the milk bowl assembly 2 for conforming to the user's skin, and a cover connector for detachably connecting the main unit assembly 1 and the milk bowl assembly 2. The cover connector is equipped with a liquid level sensing component for detecting the height of the stored milk level. When the stored milk level approaches the liquid level sensing component, the liquid level sensing component feeds back a liquid level change signal to the main unit assembly 1.

[0028] Specifically, in this embodiment, the liquid level sensing component includes a metal sensing plate 91 for sensing the height of the milk storage liquid level and a metal probe 92 for providing feedback on the height of the milk storage liquid level. The metal probe 92 abuts against the metal sensing plate 91 to detect and feedback the electrical signal of the liquid level change during milk storage to the circuit board structure 14 of the main unit 1 via an electrical connection. The cover connector includes a main unit cover 4 installed on the main unit 1 to form the main unit cavity 10, and a milk bowl cover 5 installed on the milk bowl assembly 2 to form the milk bowl cavity 20. The milk bowl cover 5 has a milk storage channel structure 6 communicating with the milk bowl cavity 20. The metal sensing plate 91 is installed on the mounting surface a of the milk bowl cover 5 for contacting the main unit cover 4. The mounting surface b of the main unit cover 4 for contacting the milk bowl cover 5 is provided with a probe through hole 45. After the main unit cover 4 and the milk bowl cover 5 are connected, the metal probe 92 passes through the probe through hole 45 and extends to abut against the metal sensing plate 91 to detect the liquid level change during milk storage. In this configuration, the metal sensor 91 is preferably positioned between the middle and top of the milk bowl lid 5, specifically near the milk inlet 211 at the top of the milk bowl shell 21. The metal sensor 91 utilizes capacitive sensing to detect the gradually rising liquid level during the milk extraction process. When the liquid level in the milk bowl cavity 20 rises close to the metal sensor 91, the metal probe 92, which rests against the surface of the metal sensor 91, sends capacitive feedback to the main unit 1 to alert the user that the milk bowl cavity 20 is about to reach its maximum capacity, allowing the user to promptly remove the milk for external storage. The metal probe 92 is mounted on the circuit board structure 14 of the main unit 1 and can be either a buzzer or a light source to notify the user that the milk level is approaching the metal sensor 91, preventing excessive milk extraction and overflow from the milk bowl cavity 20, thus facilitating user convenience.

[0029] Furthermore, in some embodiments, the metal probe 92 is a pogopin spring structure, and the metal sensing sheet 91 is a capacitive sensor. The metal sensing sheet 91 is located between the middle and the top of the milk bowl lid 5. The metal sensing sheet 91 is preferably located in the range of two-thirds to four-fifths of the total height along the height direction of the milk bowl cavity 20. At least two metal sensing sheets 91 are arranged at the same horizontal height position of the milk bowl lid 5, preferably on the left and right sides of the horizontal position of the second cavity 51. The surface of the metal sensing sheet 91 that is contacted by the metal probe 92 is flush with the assembly surface a, so as to avoid affecting the screwing assembly of the main unit lid 4 and the milk bowl lid 5 and to facilitate user use.

[0030] Example 2 See Figures 1 to 9 This embodiment illustrates a breast pump for easy liquid level detection, comprising a main unit assembly 1 for performing negative pressure suction, a milk bowl assembly 2 adapted to the main unit assembly 1 for collecting breast milk, a horn cover 3 installed on the milk bowl assembly 2 for conforming to the user's skin, and a cover connector for detachably connecting the main unit assembly 1 and the milk bowl assembly 2. The cover connector includes a main unit cover 4 installed on the main unit assembly 1 to form a main unit cavity 10, and a milk bowl cover 5 installed on the milk bowl assembly 2 to form a milk bowl cavity 20. The milk bowl cover 5 has a milk storage channel structure 6 communicating with the milk bowl cavity 20. After the main unit cover 4 and the milk bowl cover 5 are connected, the main unit assembly 1 and the milk bowl assembly 2 are arranged vertically side by side, with the main unit assembly 1 located between the milk bowl assembly 2 and the horn cover 3. Specifically, in this embodiment, the main unit assembly 1 includes a main unit outer shell 11 that surrounds the main unit cover 4 to form the main unit inner cavity 10. The main unit assembly 1 adopts a hollow through-structure. The soft mounting part 31 of the horn cover 3 passes through the hollow position of the main unit outer shell 11 and is installed at the milk inlet 61 of the milk storage channel structure 6. The main unit assembly 1 is located between the milk bowl assembly 2 and the horn cover 3 and is arranged vertically side by side with the milk bowl assembly 2, so that the main unit inner cavity 10 and the milk bowl inner cavity 20 are separated into a front and rear arrangement by the cover connector. Since the cover connector divides the entire breast pump into two independent front and rear chamber structures, the milk... The bowl cavity 20 fully utilizes the rear chamber (the chamber furthest from the user's body) of the breast pump vertically as a space for storing breast milk. This solves the problem of traditional breast pumps where the vertical space is occupied and compressed by the main unit due to their stacked structure, thus increasing the milk storage capacity of the bowl cavity 20. Meanwhile, the main unit cavity 10 fully utilizes the front chamber (the chamber closest to the user's body) vertically as a space for installing the main unit components. This solves the problem of traditional breast pumps where the vertical space must be avoided to accommodate the milk storage section, compressing the size of the suction components. Figure 8As shown, the main unit 1 includes a vacuum pump 12 for implementing negative pressure suction, a battery 13 for providing power, and a circuit board structure 14 for operating the main unit 1. The vacuum pump 12, battery 13, and circuit board structure 14 are respectively mounted on the mounting surface c of the main unit cover 4 facing the inner cavity 10 of the main unit. The first recess 41 of the main unit cover 4, the battery 13, the vacuum pump 12, and the circuit board structure 14 are arranged circumferentially around the hollow position of the main unit 1 in the inner cavity 10 of the main unit, forming a circular or elliptical ring-shaped circumferential arrangement structure. This makes full use of the space along the vertical direction for installing the main unit components, and the overall structural layout is more reasonable and compact. At the same time, it takes into account both reducing the product volume and increasing the milk storage capacity. Since the main unit 1 is located closer to the user's body than the milk bowl assembly 2, the center of gravity of the breast pump is closer to the user's body, which improves the stability of the breast pump during the initial use of the pump after wearing it. It is not easy to loosen or fall off, and avoids the impact of the center of gravity factor on the user's use of the traditional breast pump with the stacking method.

[0031] Furthermore, in some embodiments, the milk outlet 62 of the milk storage channel structure 6 is equipped with a one-way valve 22. The milk outlet 62 is preferably located on the lower side of the milk storage channel structure 6 and extends downward to form a through hole structure adapted to install the one-way valve 22, so as to prevent the breast milk from overflowing or flowing back into the milk storage channel structure 6 after entering the inner cavity 20 of the milk bowl.

[0032] Furthermore, in some embodiments, the main unit cover 4 has a first recess 41, and the milk bowl cover 5 has a second recess 51. After the main unit cover 4 and the milk bowl cover 5 are connected, the first recess 41 and the second recess 51 cooperate to form a sealed negative pressure inner cavity structure 7. The first recess 41 has an air passage interface 46 for the air pump 12 to connect to. The air passage interface 46 extends from the cavity wall of the first recess 41 toward the inner cavity 10 of the main unit with a through hole structure adapted for air pipe connection. The air passage structure between the air pump 12 and the first recess 41 is provided with a solenoid valve 15 for air passage opening and closing. The milk bowl cover 5 has an air extraction channel 52 connecting the second recess 51 and the milk storage channel structure 6. The air passage structure of the main unit assembly 1 is connected to the first recess 41 to draw air from the negative pressure inner cavity structure 7 to form a negative pressure state. More specifically, the first recess 41 is located near the top of the inner cavity 10 of the main unit. The pump 12 is located near the bottom of the inner cavity 10 of the main unit. The pump 12 is connected to the first concave cavity 41 through an air pipe to draw air from the negative pressure inner cavity structure 7 to form a negative pressure state. The hollow part of the main unit component 1 is located between the first concave cavity 41 and the pump 12. On the circular or elliptical ring-shaped circumferential arrangement of the main unit component 1, the first concave cavity 41 and the pump 12 are arranged separately on the top, bottom and sides, which can further optimize the spatial layout. This allows the first concave cavity 41 with a certain chamber volume and the pump 12 with a certain body volume to be staggered and no longer stacked together, affecting the overall layout structure. After separation, the heavier pump 12 is located at the bottom, which can lower the center of gravity and make it less likely for the user to loosen and fall off after wearing the breast pump. In addition, there is enough space in the first concave cavity 41 and the pump 12 to arrange the solenoid valve, which is conducive to the optimization of the overall structure.

[0033] Furthermore, in some embodiments, the outer side of the opening of the first concave cavity 41 is provided with a sealing protrusion ring structure 42 for improving the connection sealing effect. The sealing protrusion ring structure 42 is an annular sealing ring structure protruding on the assembly surface b of the main unit cover 4, which is used to abut against the surface of the milk bowl cover 5 to form an airtight effect to ensure the implementation of negative pressure suction. The second concave cavity 51 is provided with an elastically deformable suction bowl 53. After the main unit cover 4 and the milk bowl cover 5 are connected, the sealing protrusion ring structure 42 abuts against the surface of the suction bowl 53 to form a sealed negative pressure inner cavity structure 7. When using, the user only needs to simply twist to complete the assembly, use and disassembly of the main unit component 1 and the milk bowl component 2. After twisting and assembling, the first concave cavity 41 moves to the position corresponding to the second concave cavity 51, so that the sealing protrusion ring structure 42 abuts against the surface of the suction bowl 53 to form an airtight negative pressure inner cavity structure 7.

[0034] Example 3 See Figure 1 , Figure 3 , Figure 5This embodiment illustrates a breast pump for easy liquid level detection, comprising a main unit assembly 1 for performing negative pressure suction, a milk bowl assembly 2 adapted to the main unit assembly 1 for collecting breast milk, a horn cover 3 mounted on the milk bowl assembly 2 for conforming to the user's skin, and a cover connector for detachably connecting the main unit assembly 1 and the milk bowl assembly 2. The cover connector includes a main unit cover 4 mounted on the main unit assembly 1 to form a main unit cavity 10, and a milk bowl cover 5 mounted on the milk bowl assembly 2 to form a milk bowl cavity 20. The main unit assembly 1 also includes a milk level light 81 for illuminating and observing the milk storage liquid level, and a light fixture 82 for mounting the milk level light 81 on the main unit cover 4. The main unit assembly 1 includes a main unit cavity enclosed by the main unit cover 4. The main unit housing 11 of the 10 includes a milk bowl assembly 2, which is formed by the milk bowl housing 21 that surrounds the milk bowl lid 5 to form the milk bowl cavity 20. The main unit housing 4 has a lamp holder mounting hole 46 for light to pass through. The lighting lamp holder 82, the milk bowl lid 5 and the milk bowl housing 21 are all made of transparent material. After the milk position lighting lamp 81 is powered on, the light passes through the lighting lamp holder 82 and the milk bowl lid 5 and illuminates the milk bowl cavity 20. It also clearly reflects the gradually rising and changing liquid level line of the breast milk during the collection process on the milk bowl housing 21. During the milk pumping process, the user can easily understand the real-time liquid level changes of the breast milk being pumped and collected by simply looking down. The user can also have a grasp of the overall pumping progress, making it convenient for the user to pump breast milk at night or in dim environments.

[0035] Example 4 See Figure 1 , Figure 8 , Figure 9 This embodiment illustrates a breast pump for easy liquid level detection, including a main unit assembly 1 for performing negative pressure suction, a milk bowl assembly 2 adapted to the main unit assembly 1 for collecting breast milk, a horn cover 3 mounted on the milk bowl assembly 2 for conforming to the user's skin, and a cover connector for detachably connecting the main unit assembly 1 and the milk bowl assembly 2. The cover connector includes a main unit cover 4 mounted on the main unit assembly 1 to form a main unit cavity 10, and a milk bowl cover 5 mounted on the milk bowl assembly 2 to form a milk bowl cavity 20. The milk bowl cover 5 has an inclined protruding positioning protrusion 55 on its mounting surface a for contacting the main unit cover 4. The main unit cover 4 is used for... The mounting surface b of the milk bowl lid 5 is provided with a positioning groove 43 for mounting the positioning protrusion 55. The edge of the positioning groove 43 has a sliding ramp 44 that slopes from the mounting surface b toward the bottom of the groove. With the cooperation of the positioning protrusion 55 and the positioning groove 43, the user can easily assemble, use and disassemble the main unit component 1 and the milk bowl component 2 by simply twisting. The positioning protrusion 55 slides smoothly into the positioning groove 43 via the sliding ramp 44, or slides smoothly out of the positioning groove 43, forming an installation method that is easy to twist and position. This makes it easier for the user to install the milk bowl component in place during the twisting and installation process, so that it is not easy to loosen.

[0036] Furthermore, in some embodiments, the milk bowl cover 5 has an external threaded connection 56 on the assembly surface a for contacting the main unit cover 4, and the hollow position of the main unit housing 11 has an internal threaded connection 111 for engaging the external threaded connection 56. When using, the user only needs to simply twist to complete the assembly, use, disassembly, and separation of the main unit assembly 1 and the milk bowl assembly 2. Combined with the inner buckle 57 of the milk bowl cover 5 near the milk inlet 61, the soft mounting part 31 of the horn cover 3 is clamped in the position of the milk inlet 61. The milk bowl cover 5 and the horn cover 3 form a front and rear structure to clamp the main unit assembly 1 in the middle, further improving the stability after installation.

[0037] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A breast pump for easy liquid level detection, comprising a main unit assembly (1) for performing negative pressure suction, a milk bowl assembly (2) adapted to the main unit assembly (1) for collecting breast milk, a horn cover (3) mounted on the milk bowl assembly (2) and for conforming to the user's skin, and a cover connector for detachably connecting the main unit assembly (1) and the milk bowl assembly (2), characterized in that: The cover connector is equipped with a liquid level sensing component for detecting the height of the milk storage liquid. When the milk storage liquid level approaches the liquid level sensing component, the liquid level sensing component feeds back a liquid level change signal to the main unit (1).

2. The breast pump for easy liquid level detection as described in claim 1, characterized in that: The liquid level sensing component includes a metal sensing plate (91) for sensing the height of the milk storage liquid level and a metal probe (92) for feeding back the height of the milk storage liquid level. The metal probe (92) abuts against the metal sensing plate (91) to detect and feed back the liquid level change signal during milk storage to the host component (1). The cover connector includes a main unit cover (4) installed on the main unit assembly (1) to form the main unit cavity (10) and a milk bowl cover (5) installed on the milk bowl assembly (2) to form the milk bowl cavity (20). The milk bowl cover (5) has a milk storage channel structure (6) that communicates with the milk bowl cavity (20).

3. A breast pump for easy liquid level detection as described in claim 2, characterized in that: The metal probe (92) is a pogopin spring structure, and the metal sensing sheet (91) is a capacitive sensor; The metal sensor (91) is installed on the assembly surface a of the milk bowl cover (5) for contacting the main unit cover (4). The assembly surface b of the main unit cover (4) for contacting the milk bowl cover (5) is provided with a probe through hole (45). After the main unit cover (4) and the milk bowl cover (5) are connected, the metal probe (92) passes through the probe through hole (45) and extends to abut against the metal sensor (91) to detect the liquid level change during milk storage. The metal sensor (91) is located between the middle and the top of the milk bowl lid (5). At least two metal sensors (91) are arranged at the same horizontal height of the milk bowl lid (5). The surface of the metal sensor (91) that is contacted by the metal probe (92) is flush with the assembly surface a.

4. A breast pump for easy liquid level detection as described in claim 2, characterized in that: The main unit cover (4) has a first cavity (41), and the milk bowl cover (5) has a second cavity (51). After the main unit cover (4) and the milk bowl cover (5) are connected, the first cavity (41) and the second cavity (51) cooperate to form a sealed negative pressure inner cavity structure (7). The milk bowl cover (5) has an air extraction channel (52) that connects the second concave cavity (51) and the milk storage channel structure (6). The air passage structure of the main unit (1) is connected to the first concave cavity (41) to draw air from the negative pressure inner cavity structure (7) to form a negative pressure state.

5. A breast pump for easy liquid level detection as described in claim 4, characterized in that: The main unit (1) includes a vacuum pump (12) for implementing negative pressure suction, a battery (13) for providing power, and a circuit board structure (14) for operating the main unit (1). The vacuum pump (12) is connected to the first cavity (41) through an air pipe to draw air from the negative pressure inner cavity structure (7) to form a negative pressure state. The air passage structure between the vacuum pump (12) and the first cavity (41) is provided with a solenoid valve (15) for opening and closing the air passage. The first cavity (41) is located near the top of the main unit inner cavity (10), and the vacuum pump (12) is located near the bottom of the main unit inner cavity (10).

6. A breast pump for easy liquid level detection as described in claim 5, characterized in that: The hollow position of the main unit (1) is located between the first cavity (41) and the air pump (12). The first cavity (41), the battery (13), the air pump (12) and the circuit board structure (14) are arranged circumferentially around the hollow position of the main unit (1) in the inner cavity (10) of the main unit.

7. A breast pump for easy liquid level detection as described in claim 4, characterized in that: The first concave cavity (41) has a sealing ring structure (42) on the outside of the cavity opening to improve the connection sealing effect. The second concave cavity (51) has a deformable suction bowl (53). After the main unit cover (4) and the milk bowl cover (5) are connected, the sealing ring structure (42) abuts against the surface of the suction bowl (53) to form a sealed negative pressure inner cavity structure (7).

8. A breast pump for easy liquid level detection as described in claim 2, characterized in that: The milk bowl cover (5) has an inclined protruding positioning protrusion (55) on the assembly surface a for contacting the main body cover (4), and the main body cover (4) has a positioning groove (43) for cooperating with the positioning protrusion (55) for installation on the assembly surface b for contacting the milk bowl cover (5). The edge of the positioning groove (43) has a sliding ramp (44) that slopes from the assembly surface b toward the bottom of the groove.

9. A breast pump for easy liquid level detection as described in claim 2, characterized in that: The main unit assembly (1) includes a main unit housing (11) that surrounds the main unit cover (4) to form the main unit cavity (10). The milk bowl cover (5) has an external threaded connection (56) on its assembly surface a for contacting the main unit cover (4). The hollow position of the main unit housing (11) has an internal threaded connection (111) for cooperating with the external threaded connection (56). The soft mounting part (31) of the horn cover (3) passes through the hollow position of the main unit housing (11) and is installed at the milk inlet (61) of the milk storage channel structure (6). The milk outlet (62) of the milk storage channel structure (6) is equipped with a one-way valve (22).

10. A breast pump for easy liquid level detection as described in any one of claims 2-9, characterized in that: It also includes a milk level light (81) for illuminating and observing the milk storage liquid level, and a light fixture (82) for mounting the milk level light (81) on the main unit cover (4). The milk bowl assembly (2) includes a milk bowl shell (21) that surrounds the milk bowl cover (5) to form the milk bowl cavity (20). The main unit cover (4) has a light fixture mounting hole (46) for the light to pass through. The light fixture (82), the milk bowl cover (5) and the milk bowl shell (21) are all made of transparent material.

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