A breast pump device for expressing breast milk

Abstract

The present application discloses a breast pump device for expressing breast milk, which includes a milk storage bottle, an inhalation unit, and a funnel. The inhalation unit includes a housing having a milk suction cavity inside and a milk discharge port provided at the bottom; a reciprocating piston that can reciprocate in the milk suction cavity and has an outer end extending out of the milk suction cavity; a pair of one-way valve units respectively installed at the inner end of the funnel and the lower end of the milk discharge port; a quick-release mechanism for detachably connecting the housing to the milk storage bottle. One end of the funnel communicates with the milk suction cavity. By adopting the above technical solutions, during daily use, the user can hold the housing with the palm, thumb, little finger, and ring finger, and press the reciprocating piston with the remaining two fingers to change the volume in the milk suction cavity, sometimes forming a negative pressure to allow breast milk to enter the milk suction cavity from the funnel, and sometimes forming a positive pressure to allow the breast milk in the milk suction cavity to enter the milk storage bottle.

Description

Technical Field

[0001] The present invention relates to a breast pump device for extruding breast milk. Background Art

[0002] A breast pump is an auxiliary tool for infant breastfeeding, which can conveniently store excessive breast milk and is widely used. In existing breast pumps, negative pressure is usually applied to suck breast milk;

[0003] The Chinese invention patent breast pump and a breast milk extraction method using the device with the publication number CN109172897B includes a breast pump funnel, a rubber ring, a pressure relief device, a delivery pipe, a fixing part, a bottom plate, an arc wedge, a rotating part, a ring groove a, an anti-retreat block, an anti-retreat groove, a partition plate, a breast milk collection device, an elastic member, etc. By repeatedly pressing the elastic member and cooperating with the combined actions of a milk storage bottle, a sensor, an electromagnet, a stop lever, a push rod, a rectangular notch, a spring b, a seal and a large hole, breast milk enters the milk storage bottle and overflows of the milk storage bottle is prevented. However, the technical solution has the following defects:

[0004] 1. It is necessary to wait until the breast milk in the milk storage bottle reaches a certain amount before closing the milk storage bottle to prevent breast milk from overflowing. In this way, when the user shakes during use, breast milk will still overflow;

[0005] 2. It is necessary to hold the breast pump with one hand and then press the elastic member upward with the other hand to collect breast milk, and it cannot be operated with one hand, which affects the convenience of using the breast pump;

[0006] 3. The milk storage bottle is placed inside the device and is not convenient to take out. Summary of the Invention

[0007] The present invention aims to solve one of the technical problems existing in the prior art.

[0008] The present application provides a breast pump device for extruding breast milk, including a milk storage bottle, a suction unit and a funnel. The suction unit includes:

[0009] A housing having a breast milk suction cavity inside and a milk discharge port at the bottom;

[0010] A reciprocating piston that can reciprocate in the breast milk suction cavity and has an outer end extending out of the breast milk suction cavity;

[0011] A pair of one-way valve units respectively installed at the inner end of the funnel and the lower end of the milk discharge port;

[0012] A quick-release mechanism for detachably connecting the housing to the milk storage bottle;

[0013] Wherein, one end of the funnel is communicated with the breast milk suction cavity.

[0014] It further includes:

[0015] An open end, which is provided at one end of the outer shell;

[0016] An end cap, which is fixedly installed at the open end of the outer shell by screws;

[0017] A jack, which is provided at the inner end of the reciprocating piston;

[0018] A plug rod, which is slidably inserted into the jack, and one end extends out of the jack and is fixedly connected to the inner side wall of the milk suction cavity;

[0019] A return spring, which is provided between the inner end of the plug rod and the inner end of the jack;

[0020] Wherein, the outer end of the reciprocating piston can be movably inserted through the end cap and extend out of the milk suction cavity.

[0021] The one-way valve unit includes:

[0022] A recess, which is provided at the inner end of the inner cavity of the funnel or the lower end of the milk discharge port;

[0023] A cover plate, which is openably and closably installed in the recess, and one end is hinged to the recess through a hinge shaft;

[0024] An elastic unit, which is installed between the end of the recess away from the hinge shaft and this end of the cover plate.

[0025] The elastic unit includes:

[0026] A notch, which is provided at the end of the cover plate away from the hinge shaft;

[0027] A sliding groove, which is provided on the outer shell and corresponds to the notch;

[0028] A sliding piston, which is floatingly installed in the sliding groove through a preloaded spring;

[0029] A ball-headed connecting rod, the ball head of which abuts against the outer surface of the end of the cover plate away from the pin shaft, and the rod body thereof can be movably inserted through the notch and one end of the recess in sequence and then extends into the sliding groove and is fixedly connected to the sliding piston.

[0030] The quick-release mechanism includes:

[0031] A ring cover, which is integrally formed at the bottom of the outer shell and can be sleeved on the bottle mouth of the milk storage bottle;

[0032] A pair of clamping grooves, which are symmetrically provided on the inner side wall of the ring cover;

[0033] A pair of sliders, which are symmetrically and fixedly installed on the outer side wall of the bottle mouth of the milk storage bottle;

[0034] Wherein, a pair of sliders can both slide in the corresponding clamping grooves.

[0035] The clamping groove includes:

[0036] A vertical groove, which is provided on the inner side wall of the ring cover;

[0037] A horizontal groove is provided on the inner side wall of the ring cover, with one end communicating with the upper end of the vertical groove and the other end extending in the clockwise / counterclockwise direction;

[0038] A limiting unit is used to prevent the corresponding slider from detaching from the inner end of the horizontal groove.

[0039] The limiting unit includes:

[0040] A lifting groove is provided at the bottom of the middle section of the horizontal groove;

[0041] A lifting block is floatingly installed between the lifting groove and the horizontal groove;

[0042] A lifting control member includes a pushable insertion block for controlling the lifting of the lifting block.

[0043] The limiting unit further includes:

[0044] A pair of limiting grooves are symmetrically provided in the middle and lower parts of the side walls at both ends of the lifting groove;

[0045] A pair of limiting sliders are respectively slidably installed in the respective limiting grooves and fixedly connected to the lifting block.

[0046] The lifting control member includes:

[0047] An insertion slot is provided on the side wall of the ring cover and communicates with the lifting groove;

[0048] A transmission groove penetrates through the middle of the lifting block from left to right, and the lower end face is inclined outward;

[0049] An insertion block is slidably inserted into the insertion slot, and the inner end abuts against the lower end face of the transmission groove;

[0050] A plurality of lifting springs are arranged at intervals between the bottom end of the lifting block and the bottom surface of the lifting groove.

[0051] The lifting control member further includes:

[0052] A pair of inclined grooves are symmetrically provided on the inner wall of the transmission groove;

[0053] A horizontal through hole penetrates through both ends of the insertion block;

[0054] A threaded hole is provided on the outer surface of the insertion block, and the inner end communicates with the middle of the horizontal through hole;

[0055] A pair of limiting rods are respectively inserted into both ends of the horizontal through hole;

[0056] A bolt is threadedly installed in the threaded hole. When the inner end extends into the horizontal through hole, the outer ends of the respective limiting rods can be slidably inserted into the corresponding inclined grooves.

[0057] The beneficial effects of the present invention are as follows:

[0058] 1. Through the settings of the outer shell, milk suction cavity, milk discharge port, reciprocating piston, a pair of one-way valve units, open end, cover plate, jack, inserting rod and return spring, the user can hold the outer shell with one hand and press the reciprocating piston to change the volume of the milk suction cavity. In cooperation with a pair of one-way valve units, breast milk can enter the milk storage bottle through the path of the funnel, milk suction cavity and milk discharge port, ensuring that breast milk never overflows from the milk storage bottle into the funnel at any time;

[0059] 2. Through the settings of the recess, cover plate, notch, sliding groove, sliding piston and ball head connecting rod, the cover plate cooperating with the funnel opens when the inner cavity of the milk suction cavity is under negative pressure and closes when under positive pressure. The other cover plate is opposite, closing when the milk suction cavity is under negative pressure and opening when under positive pressure, which can provide double protection to prevent breast milk from overflowing outside the device;

[0060] 3. Through the cooperation of the ring cover, a pair of vertical grooves, a pair of horizontal grooves, a pair of limiting units and a pair of sliders, the quick disassembly and assembly of the outer shell and the milk storage bottle are realized, facilitating the user to pour out the breast milk in the milk storage bottle;

[0061] 4. Through the settings of the lifting groove, lifting block, a pair of limiting grooves, a pair of limiting sliders, inserting slot, transmission groove, inserting block, several lifting springs, a pair of inclined grooves, horizontal through hole, screw hole, a pair of limiting rods and bolts, the user needs to press the inserting block to rotate and open the ring cover, ensuring the sealing performance and avoiding accidental opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 FIG. is a schematic diagram of the internal structure of the breast milk extractor device for extruding breast milk in the embodiment of the present application;

[0063] Figure 2 is Figure 1 a schematic cross-sectional structure diagram in the A-A direction in;

[0064] Figure 3 is Figure 1 a schematic diagram of the partial enlarged structure at B in;

[0065] Figure 4 is Figure 1 a schematic diagram of the partial enlarged structure at C in;

[0066] Figure 5 FIG. is a schematic diagram of the partial inner wall structure of the ring cover in the embodiment of the present application;

[0067] Figure 6 FIG. is a schematic cross-sectional view of the inserting block in the embodiment of the present application.

[0068] REFERENCE MARKS

[0069] 1 - Milk storage bottle, 2 - Inhalation unit, 201 - Housing, 202 - Milk suction cavity, 203 - Milk discharge port, 204 - Reciprocating piston, 205 - Open end, 206 - End cap, 207 - Jack, 208 - Plug rod, 209 - Return spring, 3 - Funnel, 4 - Check valve unit, 401 - Trough, 402 - Cover plate, 5 - Elastic unit, 501 - Notch, 502 - Sliding groove, 503 - Sliding piston, 504 - Preloaded spring, 505 - Ball head connecting rod, 6 - Limiting unit, 601 - Lifting groove, 602 - Lifting block, 603 - Limiting groove, 604 - Limiting slider, 7 - Lifting control member, 701 - Slot, 702 - Transmission groove, 703 - Insert block, 704 - Lifting spring, 705 - Inclined groove, 706 - Horizontal through hole, 707 - Screw hole, 708 - Limiting rod, 709 - Bolt, 8 - Quick release mechanism, 801 - Ring cover, 802 - Card slot, 8021 - Vertical slot, 8022 - Horizontal slot, 803 - Slider. Detailed implementation mode

[0070] The following will clearly describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0071] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or multiple. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the associated objects before and after are in an "or" relationship.

[0072] The following will, with reference to the accompanying drawings, explain in detail the server provided by the embodiments of the present application through specific embodiments and their application scenarios.

[0073] Embodiment 1:

[0074] As Figures 1 to 2As shown in the figure, an embodiment of the present application provides a breast pump device for extruding breast milk, which includes a milk storage bottle 1, a suction unit 2, and a funnel 3. The suction unit 2 includes a housing 201 with a milk suction cavity 202 inside and a milk discharge port 203 provided at the bottom; a reciprocating piston 204 that can reciprocate in the milk suction cavity 202, and the outer end extends out of the milk suction cavity 202; a pair of one-way valve units 4 are respectively installed at the inner end of the funnel 3 and the lower end of the milk discharge port 203; a quick-release mechanism 5 is used to detachably connect the housing 201 to the milk storage bottle 1, and one end of the funnel 3 is communicated with the milk suction cavity 202.

[0075] Further, it also includes an open end 205 provided at one end of the housing 201; an end cap 206 fixedly installed at the open end 205 of the housing 201 by screws; a jack 207 provided at the inner end of the reciprocating piston 204; a plug 208 that can slide and be inserted into the jack 207, and one end extends out of the jack 207 and is fixedly connected to the inner side wall of the milk suction cavity 202; a return spring 209 is provided between the inner end of the plug 208 and the inner end of the jack 207, and the outer end of the reciprocating piston 204 can movably penetrate through the end cap 206 and extend out of the milk suction cavity 202.

[0076] In this embodiment of the present application, due to the above structure, the user holds the housing 201 with one hand. Specifically, hold the housing 201 with the palm, thumb, little finger, and ring finger, and use the remaining two fingers to press the reciprocating piston 204. When pressing the reciprocating piston 204 into the milk suction cavity 202, the volume of the inner end of the milk suction cavity 202 decreases, the air pressure increases, the one-way valve unit 4 installed at the lower end of the milk discharge port 203 opens, and the other one-way valve unit 4 closes. The breast milk in the milk suction cavity 202 enters the milk storage bottle 1 through the milk discharge port 203. During this process, the inner end of the plug 208 extends deep into the jack 207, causing the return spring 209 to be compressed and store elastic potential energy. Subsequently, the index finger and middle finger of the user are released, and the return spring 209 releases the elastic potential energy, pushing the reciprocating piston 204 to slide out of the milk suction cavity 202, increasing the volume of the inner end of the milk suction cavity 202, closing the one-way valve unit 4 installed at the lower end of the milk discharge port 203, and opening the other one-way valve unit 4, creating a negative pressure in the funnel 3 as well. The breast milk enters the milk suction cavity 202 through the funnel 3. Repeating the above actions can make the breast milk enter the milk storage bottle 1 and will not overflow outside the funnel 3.

[0077] Embodiment 2:

[0078] As Figure 1 and Figure 3 shown, in this embodiment, in addition to including the structural features of the foregoing embodiment, the one-way valve unit 4 includes a recess 401 provided at the inner end of the inner cavity of the funnel 3 or the lower end of the milk discharge port 203; a cover plate 402 that can be opened and closed and installed in the recess 401, and one end is hinged to the recess 401 through a hinge shaft; an elastic unit 5 is installed between the end of the recess 401 away from the hinge shaft and this end of the cover plate 402.

[0079] Further, the elastic unit 5 includes a notch 501 provided at the end of the cover plate 402 away from the hinge shaft; a sliding groove 502 provided on the outer shell 201 corresponding to the notch 501; a sliding piston 503 that is floatingly installed in the sliding groove 502 through a preloaded spring 504; a ball head connecting rod 505, the ball head of which abuts against the outer surface of the cover plate 402 away from the pin shaft end, and the rod body thereof sequentially passes through the notch 501 and one end of the recess 401 movably and then extends into the sliding groove 502 and is fixedly connected to the sliding piston 503.

[0080] In this embodiment of the present application, due to the above structure, when the air pressure at the inner end of the milk suction cavity 202 increases, the cover plate 402 installed at the lower end of the milk discharge port 203 is pushed open, and the corresponding ball head connecting rod 505 and sliding piston 503 descend, and the preloaded spring 504 is compressed and shortened, so that the milk suction cavity 202 is connected to the inner cavity of the milk storage bottle 1 through the milk discharge port 203. At this time, the cover plate 402 corresponding to the funnel 3 is tightly pressed in the corresponding recess 401 under the cooperation of the corresponding ball head connecting rod 505, sliding piston 503, preloaded spring 504, notch 501 and air pressure to close the inner end of the funnel 3. When the air pressure at the inner end of the milk suction cavity 202 decreases, the cover plate 402 corresponding to the funnel 3 opens towards the milk suction cavity 202, so that the inner cavity of the funnel 3 is communicated with the milk suction cavity 202. The corresponding ball head connecting rod 505 and piston slide towards the milk suction cavity 202, and the preloaded spring 504 is compressed and shortened. The cover plate 402 corresponding to the milk discharge port 203 is tightly pressed in the corresponding recess 401 under the cooperation of the corresponding ball head connecting rod 505, sliding piston 503, preloaded spring 504, notch 501 and air pressure to close the milk discharge port 203.

[0081] Embodiment 3:

[0082] As Figure 1 and Figures 4 to 6 shown, in this embodiment, in addition to including the structural features of the foregoing embodiment, the quick-release mechanism 5 includes a ring cover 801 integrally formed at the bottom of the outer shell 201 and sleeved on the bottle mouth of the milk storage bottle 1; a pair of clamping grooves 802 symmetrically provided on the inner side wall of the ring cover 801; a pair of sliders 803 symmetrically and fixedly installed on the outer side wall of the bottle mouth of the milk storage bottle 1, and the pair of sliders 803 can slide in the corresponding clamping grooves 802.

[0083] Further, the clamping groove 802 includes: a vertical groove 8021 provided on the inner side wall of the ring cover 801; a horizontal groove 8022 provided on the inner side wall of the ring cover 801, one end of which is connected to the upper end of the vertical groove 8021, and the other end extends in the clockwise / counterclockwise direction; a limiting unit 6 for preventing the corresponding slider 803 from detaching from the inner end of the horizontal groove 8022.

[0084] Further, the limiting unit 6 includes: a lifting groove 601 provided at the bottom of the middle section of the transverse groove 8022; a lifting block 602 that is floatingly installed between the lifting groove 601 and the transverse groove 8022; a lifting control member 7 including a pushable insertion block 703 for controlling the lifting of the lifting block 602.

[0085] Further, the limiting unit 6 further includes a pair of limiting grooves 603 symmetrically provided in the lower middle parts of the two side walls at the two ends of the lifting groove 601; a pair of limiting sliders 604 that are respectively slidably installed in the respective limiting grooves 603 and fixedly connected to the lifting block 602.

[0086] Further, the lifting control member 7 includes a slot 701 provided on the side wall of the annular cover 801 and communicating with the lifting groove 601; a transmission groove 702 that penetrates through the middle of the lifting block 602 from left to right and whose lower end face inclines outward; an insertion block 703 that is slidably inserted into the slot 701 and whose inner end abuts against the lower end face of the transmission groove 702; a plurality of lifting springs 704 that are spaced between the bottom end of the lifting block 602 and the bottom surface of the lifting groove 601.

[0087] Further, the lifting control member 7 further includes a pair of inclined grooves 705 symmetrically provided on the inner wall of the transmission groove 702; a horizontal through hole 706 that penetrates through both ends of the insertion block 703; a threaded hole 707 provided on the outer surface of the insertion block 703 and whose inner end communicates with the middle of the horizontal through hole 706; a pair of limiting rods 708 respectively inserted into both ends of the horizontal through hole 706; a bolt 709 that is threadedly installed in the threaded hole 707, and when its inner end extends into the horizontal through hole 706, the outer ends of the respective limiting rods 708 can be slidably inserted into the respective inclined grooves 705.

[0088] In this embodiment of the present application, due to the adoption of the above structure, when disassembling and assembling the annular cover 801, it is necessary to press each insertion block 703 to insert the inner end of each insertion block 703 into the corresponding transmission groove 702, push the transmission groove 702 and the corresponding lifting block 602 to descend, so that the top ends of the respective lifting blocks 602 completely descend into the lifting groove 601. At this time, the respective lifting springs 704 are compressed and shortened. Subsequently, rotate or lift the annular cover 801, so that the pair of sliders 803 move along the trajectory of the inner end of the transverse groove 8022 → the upper end of the vertical groove 8021 → disengaging from the vertical groove 8021, so that the annular cover 801 is disengaged from the bottle mouth of the milk storage bottle 1, or move along the trajectory of entering the vertical groove 8021 → the upper end of the vertical groove 8021 → the inner end of the transverse groove 8022, so that the annular cover 801 is assembled with the bottle mouth of the milk storage bottle 1. Subsequently, release each insertion block 703, and the respective lifting springs 704 all release elastic potential energy, push the corresponding lifting block 602 to rise, so that the top ends of the respective lifting blocks 602 extend into the middle section of the corresponding transverse groove 8022, and the outer ends of the respective insertion blocks 703 extend out of the corresponding slots 701, thus completing the disassembly or assembly of the annular cover 801;

[0089] During the sliding process of the insertion block 703 in the slot 701 and the transmission slot 702, the outer ends of the respective limiting rods 708 also slide in the corresponding inclined slots 705 under the restriction of the screw holes 707 and the screw rod, preventing the insertion block 703 from disengaging from the slot 701.

[0090] It should be noted that in this text, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without more limitations, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0091] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A breast pump device for expressing breast milk, comprising a milk storage bottle (1), an inhalation unit (2) and a funnel (3), characterized in that, The sucking unit (2) includes: A housing (201) with a milk sucking cavity (202) inside and a milk discharging port (203) provided at the bottom; A reciprocating piston (204) that can reciprocate in the milk sucking cavity (202), and the outer end extends out of the milk sucking cavity (202); A pair of one-way valve units (4) respectively installed at the inner end of the funnel (3) and the lower end of the milk discharging port (203); A quick-release mechanism (8) for detachably connecting the housing (201) to the milk storage bottle (1); Wherein, one end of the funnel (3) is communicated with the milk sucking cavity (202); The quick-release mechanism (8) further includes: A ring cover (801) integrally formed at the bottom of the housing (201) and can be sleeved on the bottle mouth of the milk storage bottle (1); A pair of clamping grooves (802) symmetrically arranged on the inner side wall of the ring cover (801); A pair of sliding blocks (803) symmetrically and fixedly installed on the outer side wall of the bottle mouth of the milk storage bottle (1); Wherein, a pair of the sliding blocks (803) can slide in the corresponding clamping grooves (802); The clamping groove (802) includes: A vertical groove (8021) arranged on the inner side wall of the ring cover (801); A horizontal groove (8022) arranged on the inner side wall of the ring cover (801), one end is connected to the upper end of the vertical groove (8021), and the other end extends in the clockwise / counterclockwise direction; A limiting unit (6) for preventing the corresponding sliding block (803) from disengaging from the inner end of the horizontal groove (8022).

2. The breast pump device for expressing breast milk according to claim 1, characterized in that, It further includes: An open end (205) provided at one end of the housing (201); An end cover (206) fixedly installed at the open end (205) of the housing (201) by screws; An insertion hole (207) provided at the inner end of the reciprocating piston (204); An insertion rod (208) that can be slidably inserted into the insertion hole (207), and one end extends out of the insertion hole (207) and is fixedly connected to the inner side wall of the milk sucking cavity (202); A return spring (209) provided between the inner end of the insertion rod (208) and the inner end of the insertion hole (207); Wherein, the outer end of the reciprocating piston (204) can movably penetrate through the end cover (206) and extend out of the milk sucking cavity (202).

3. A breast pump device for expressing breast milk according to claim 1, wherein, The one-way valve unit (4) includes: A sunken groove (401) arranged at the inner end of the inner cavity of the funnel (3) or the lower end of the milk discharging port (203); A cover plate (402) that can be opened and closed and installed in the sunken groove (401), and one end is hinged to the sunken groove (401) through a hinge shaft; An elastic unit (5) installed between the end of the sunken groove (401) away from the hinge shaft and the end of the cover plate (402).

4. A breast pump device for expressing breast milk according to claim 3, characterized in that, The elastic unit (5) includes: A notch (501) arranged at the end of the cover plate (402) away from the hinge shaft; A sliding groove (502) arranged on the housing (201) and corresponding to the notch (501); A sliding piston (503) that can be floatingly installed in the sliding groove (502) through a preloaded spring (504); The ball - head connecting rod (505), whose ball - head abuts against the outer surface of the cover plate (402) away from the pin - shaft end and faces outward. After its rod body sequentially passes through the notch (501) and one end of the recess (401) movably, it extends into the sliding groove (502) and is fixedly connected to the sliding piston (503).

5. A breast pump device for expressing breast milk according to claim 1, characterized in that, The limiting unit (6) includes: The lifting groove (601) is arranged at the bottom of the middle section of the transverse groove (8022); The lifting block (602) is floatingly installed between the lifting groove (601) and the transverse groove (8022); The lifting control member (7) includes a press - able insertion block (703) for controlling the lifting of the lifting block (602).

6. A breast pump device for expressing breast milk according to claim 5, characterized in that, The limiting unit (6) further includes: A pair of limiting grooves (603) are symmetrically arranged in the lower - middle parts of the two side walls of the lifting groove (601); A pair of limiting sliders (604) are respectively slidably installed in each of the limiting grooves (603) and are fixedly connected to the lifting block (602).

7. The breast pump device for expressing breast milk according to claim 6, characterized in that, The lifting control member (7) includes: The insertion slot (701) is arranged on the side wall of the ring cover (801) and is connected to the lifting groove (601); The transmission groove (702) runs through the middle of the lifting block (602) from left to right, and the lower end face inclines outward; The insertion block (703) is slidably inserted into the insertion slot (701), and its inner end abuts against the lower end face of the transmission groove (702); A plurality of lifting springs (704) are arranged at intervals between the bottom end of the lifting block (602) and the bottom surface of the lifting groove (601).

8. A breast pump device for expressing breast milk according to claim 7, characterized in that, The lifting control member (7) further includes: A pair of inclined grooves (705) are symmetrically arranged on the inner wall of the transmission groove (702); The horizontal through - hole (706) runs through both ends of the insertion block (703); The threaded hole (707) is arranged on the outer surface of the insertion block (703), and its inner end is connected to the middle of the horizontal through - hole (706); A pair of limiting rods (708) are respectively inserted into both ends of the horizontal through - hole (706); The bolt (709) is installed in the threaded hole (707) by threading. When its inner end extends into the horizontal through - hole (706), the outer ends of the respective limiting rods (708) can be slidably inserted into the corresponding inclined grooves (705).

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