Balancing device for double-side alternating breast pump

Abstract

The invention discloses a balancing device for a bilateral alternate breast pump, which is characterized in that independent breast pumping flow paths are respectively constructed through a left shell and a right shell, and a first left inlet, a first left outlet, a first right inlet and a first right outlet are respectively provided with a one-way conducting structure, so that liquid is ensured to flow to a liquid collecting bottle from a breast pumping shield in a one-way manner. The first communicating pipeline is communicated with the first left cavity and the first right cavity, the first sliding rod is arranged in the first communicating pipeline in a penetrating mode, and a first left sealing part and a first right sealing part of the first sliding rod are in airtight enclosure with the first left cavity and the first right cavity respectively to form a first left negative pressure cavity and a first right negative pressure cavity with variable volumes; and the volumes of the two are inversely proportionally changed along with sliding of the first sliding rod. The driving part drives the first sliding rod to slide back and forth, so that the first left negative pressure cavity and the first right negative pressure cavity alternately form negative pressure. The double-side breast pump solves the problem that an existing double-side breast pump is complex in structure.

Description

Technical Field

[0001] This invention relates to the field of breast pump technology, and more particularly to a balancing device for a bilateral alternating breast pump. Background Technology

[0002] Existing dual-pump breast pumps typically employ a dual-pump structure, with two independent drive mechanisms controlling the two breast shields respectively, and relying on control circuits to achieve alternating breast pumping from both sides; or they employ a single-pump structure with a reversing valve, using a solenoid valve or mechanical valve to switch between the two air paths, so that negative pressure alternately acts on the two breast shields.

[0003] However, all of the above structures suffer from a large number of parts, complex assembly, and high cost. The dual-pump structure requires two drive sources and complex synchronous control logic; the single-pump structure with a reversing valve requires additional valve body components and control elements, which not only increases the product size but also causes system response delays due to frequent switching. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a balancing device for a bilateral alternating breast pump, so as to solve the problem of the complex structure of existing bilateral breast pumps.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] A balancing device for a bilateral alternating breast pump, characterized in that it comprises:

[0007] The left shell has a first left inlet, a first left chamber and a first left outlet connected in sequence. The first left inlet is connected to the left breast suction shield and the first left outlet is connected to the collection bottle.

[0008] The right shell has a first right inlet, a first right chamber and a first right outlet connected in sequence. The first right inlet is connected to the right breast suction shield and the first right outlet is connected to the collection bottle.

[0009] Multiple unidirectional flow structures are respectively disposed on the first left inlet, the first left outlet, the first right inlet and the first right outlet. The unidirectional flow structures are used to control the liquid to flow into the first left chamber only from the first left inlet and out from the first left outlet, and to flow into the first right chamber only from the first right inlet and out from the first right outlet.

[0010] A first connecting pipe is disposed between the left housing and the right housing, and the internal passage of the first connecting pipe is connected to the first left chamber and the first right chamber respectively.

[0011] A first sliding rod is slidably inserted into the internal channel of the first connecting pipe. The first sliding rod has a first left sealing part and a first right sealing part disposed opposite to each other. The first left sealing part is airtightly enclosed with the inner wall of the first left chamber to form a first left negative pressure chamber with variable volume. The first right sealing part is airtightly enclosed with the inner wall of the first right chamber to form a first right negative pressure chamber with variable volume. The volume of the first left negative pressure chamber and the volume of the first right negative pressure chamber change inversely proportionally as the first sliding rod slides.

[0012] A driving component, the output end of which is connected to the first slide rod, is used to drive the first slide rod to slide back and forth in the first connecting pipe so that the first left negative pressure chamber and the first right negative pressure chamber alternately form negative pressure to absorb liquid.

[0013] Furthermore, the left housing is provided with a second left inlet, a second left chamber and a second left outlet connected in sequence, and the second left inlet is connected to the first left outlet;

[0014] The right housing is provided with a second right inlet, a second right chamber and a second right outlet connected in sequence, and the second right inlet is connected to the first right outlet;

[0015] The second left outlet and the second right outlet are both provided with a one-way flow structure. The one-way flow structure is used to control the liquid to flow into the second left chamber from the second left inlet and out from the second left outlet, and to flow into the second right chamber from the second right inlet and out from the second right outlet.

[0016] The balancing device for a bilateral alternating breast pump also includes a second connecting pipe, a second slide bar, and a reverse linkage mechanism.

[0017] The second connecting pipe is located between the left housing and the right housing, and the internal passage of the second connecting pipe is connected to the second left chamber and the second right chamber respectively.

[0018] The second slide rod is reciprocally slidably inserted into the second connecting pipe. The second slide rod has a second left sealing part and a second right sealing part disposed opposite to each other. The second left sealing part and the inner wall of the second left chamber are airtightly enclosed to form a second left negative pressure chamber with variable volume. The second right sealing part and the inner wall of the second right chamber are airtightly enclosed to form a second right negative pressure chamber with variable volume. The volumes of the second left negative pressure chamber and the second right negative pressure chamber change inversely proportionally as the second slide rod slides.

[0019] A reverse linkage mechanism is provided, which connects the first slide rod and the second slide rod; the reverse linkage mechanism is configured as follows:

[0020] First stage: When the first slide bar slides to increase the volume of the first left negative pressure chamber to draw liquid through the first left inlet, the reverse linkage mechanism drives the second slide bar to slide in the opposite direction to decrease the volume of the second left negative pressure chamber to drain liquid through the second left outlet;

[0021] Second stage: When the first slide bar slides and reduces the volume of the first left negative pressure chamber, the reverse linkage mechanism drives the second slide bar to slide in the opposite direction, increasing the volume of the second left negative pressure chamber. The increase in the volume of the second left negative pressure chamber is greater than the decrease in the volume of the first left negative pressure chamber, so that the two are connected and form a negative pressure, and continuously draw liquid through the first left inlet.

[0022] Furthermore, the reverse linkage mechanism includes a swing arm and a hinge portion connected to the middle of the swing arm. The swing arm has a first connecting end and a second connecting end. The swing arm is hinged to the left housing or the right housing through the hinge portion. The first connecting end is connected to the first slide rod to drive the first slide rod to slide, and the second connecting end is connected to the second slide rod to drive the second slide rod to slide.

[0023] Furthermore, the distance from the first connecting end to the hinge is less than the distance from the second connecting end to the hinge.

[0024] Furthermore, the sliding stroke of the second slide rod is greater than that of the first slide rod.

[0025] Furthermore, the projected area of ​​the second left sealing part in the sliding direction of the second slide rod is greater than the projected area of ​​the first left sealing part in the sliding direction of the first slide rod.

[0026] Furthermore, the first left sealing part of the first slide rod is a first diaphragm, and the first diaphragm changes the volume of the first left negative pressure chamber by deformation; the second left sealing part of the second slide rod is a second diaphragm, and the second diaphragm changes the volume of the second left negative pressure chamber by deformation.

[0027] Furthermore, when the first left negative pressure chamber is at its minimum volume, the first left outlet is located at the position of the first left sealing part.

[0028] Furthermore, the driving component includes a drive motor, a cam, and a connecting rod; the output end of the drive motor is connected to the cam and drives the cam to rotate around its axis; one end of the connecting rod is hinged to the eccentric part of the cam, and the other end is hinged to the first slide rod, so as to convert the rotational motion of the cam into the reciprocating linear motion of the first slide rod sliding along the first connecting pipe.

[0029] Furthermore, the unidirectional conduction structure is a one-way valve.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] 1. The left shell is provided with a first left inlet, a first left chamber and a first left outlet connected in sequence, and the right shell is provided with a first right inlet, a first right chamber and a first right outlet connected in sequence. Multiple unidirectional flow structures are respectively provided on the first left inlet, the first left outlet, the first right inlet and the first right outlet to control the unidirectional flow of liquid. This constructs a liquid flow path foundation with independent sides and unidirectional flow, ensuring that the liquid can only be transported unidirectionally from the breast pump shield to the collection bottle during the breast pumping process, effectively preventing liquid backflow.

[0032] 2. Based on the fact that the first sliding rod can be reciprocated and slidably inserted into the first connecting pipe, the first left sealing part and the first right sealing part, which are respectively arranged opposite to each other, airtightly enclose the first left chamber and the first right chamber to form a first left negative pressure chamber and a first right negative pressure chamber with variable volume. Moreover, the volume of the first left negative pressure chamber and the first right negative pressure chamber changes inversely proportionally with the sliding of the first sliding rod. When the first sliding rod slides to the left, the volume of the first left negative pressure chamber increases while the volume of the first right negative pressure chamber decreases synchronously. The measured data shows that when the stroke of the first sliding rod is 15mm, the volume of the first left negative pressure chamber increases from 2cm³ to 4cm³, and the volume of the first right negative pressure chamber decreases from 4cm³ to 2cm³. The volume changes are equal and opposite in direction. Through the reciprocating motion of a single sliding rod, precise alternating negative pressure can be generated in both chambers, realizing the stable alternation of bilateral breast pumping actions.

[0033] 3. The output end of the driving component is connected to the first slide bar, which is used to drive the first slide bar to slide back and forth in the first connecting pipe so that the first left negative pressure chamber and the first right negative pressure chamber alternately form negative pressure to absorb liquid. The driving component actively controls the slide bar to provide a stable and reliable power output for alternating breast milk suction on both sides, so that the breast milk suction action on the left and right sides can be carried out in an orderly alternation.

[0034] 4. A two-stage liquid transport path is constructed based on the connection between the second left inlet and the first left outlet, and the connection between the second right inlet and the first right outlet, with unidirectional conduction structures at both outlets. A reverse linkage mechanism connects the first and second slide rods. When the first slide rod slides, causing the volume of the first left negative pressure chamber to change from 2 cm³ to 4 cm³ and the negative pressure to change from -2 kPa to -4 kPa, drawing liquid outwards, the reverse linkage mechanism drives the second slide rod to slide in the opposite direction, simultaneously discharging any remaining liquid or gas from the second left negative pressure chamber. When the first slide rod slides, causing the volume of the first left negative pressure chamber to change from 4 cm³ to 2 cm³ and the negative pressure to change from -4 kPa to -2 kPa, the reverse linkage mechanism drives the second slide rod to slide in the opposite direction, causing the volume of the second left negative pressure chamber to change from 2 cm³ to 6 cm³ and the negative pressure to change from -2 kPa to -6 kPa, an increase twice the decrease in the first left negative pressure chamber. The connection between the two creates a superimposed negative pressure, achieving continuous milk suction. This two-stage linkage structure ensures continuous milk suction through a multiplier effect. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the balancing device for a bilateral alternating breast pump according to the present invention, showing its connection relationship;

[0036] Figure 2 for Figure 1 A cross-sectional view of the structural schematic diagram shown;

[0037] Figure 3 for Figure 1 A structural schematic diagram from another perspective is shown.

[0038] In the diagram: 1. Left shell; 101. First left inlet; 102. First left chamber; 103. First left outlet; 104. Second left inlet; 105. Second left chamber; 106. Second left outlet; 107. First left negative pressure chamber; 108. Second left negative pressure chamber; 2. Right shell; 201. First right inlet; 202. First right chamber; 203. First right outlet; 204. Second right inlet; 205. Second right chamber; 206. Second right outlet; 207. First right negative pressure chamber; 208. 3. Second right negative pressure chamber; 4. Left breast pump shield; 5. Right breast pump shield; 6. Collection bottle; 7. One-way conduction structure; 8. First connecting pipe; 9. First slide rod; 10. First left sealing part; 11. First right sealing part; 12. Drive component; 13. Drive motor; 14. Cam; 15. Connecting rod; 16. Second connecting pipe; 17. Second slide rod; 18. Second left sealing part; 19. Second right sealing part; 10. Reverse linkage mechanism; 11. Swing rod; 12. Hinge part. Detailed Implementation

[0039] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0040] It should be noted that when an element is described as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is described as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementations.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] See Figures 1-3 A preferred embodiment of the present invention is described below:

[0043] A balancing device for a bilateral alternating breast pump includes: a left housing 1, a right housing 2, multiple unidirectional flow structures 6, a first connecting pipe 7, a first slide bar 8, and a driving component 9; the left housing 1 has a first left inlet 101, a first left chamber 102, and a first left outlet 103 connected in sequence, the first left inlet 101 connecting to a left breast shield 3, and the first left outlet 103 connecting to a collection bottle 5; the right housing 2 has a first right inlet 201, a first right chamber 202, and a first right outlet 203 connected in sequence, the first right inlet 201 connecting to a right breast shield 4, and the first right outlet 203 connecting to the collection bottle 5; multiple unidirectional flow structures 6 are respectively disposed on the first left inlet 101, the first left outlet 103, the first right inlet 201, and the first right outlet 203, the unidirectional flow structures 6 being used to control that liquid can only flow into the first left chamber 102 from the first left inlet 101 and out from the first left outlet 103, and flow into the first right chamber 202 from the first right inlet 201, and... The first right outlet 203 flows out; the first connecting pipe 7 is located between the left housing 1 and the right housing 2, and the internal channel of the first connecting pipe 7 is connected to the first left chamber 102 and the first right chamber 202 respectively; the first slide rod 8 is reciprocally slidably inserted through the internal channel of the first connecting pipe 7, and the first slide rod 8 has a first left sealing part 801 and a first right sealing part 802 arranged opposite to each other; the first left sealing part 801 and the inner wall of the first left chamber 102 are airtightly enclosed to form a first left chamber with variable volume. Negative pressure chamber 107; the first right sealing part 802 and the inner wall of the first right chamber 202 are airtightly enclosed to form a first right negative pressure chamber 207 with variable volume; the volume of the first left negative pressure chamber 107 and the volume of the first right negative pressure chamber 207 change inversely proportionally with the sliding of the first slide rod 8; the output end of the driving component 9 is connected to the first slide rod 8 and is used to drive the first slide rod 8 to slide back and forth in the first connecting pipe 7 so that the first left negative pressure chamber 107 and the first right negative pressure chamber 207 alternately form negative pressure to absorb liquid.

[0044] The present invention provides a balancing device for a bilateral alternating breast pump, which achieves alternating negative pressure breast pumping of the bilateral breast shields through the reciprocating motion of a single slide bar, thereby solving the problem of the complex structure of existing bilateral breast pumps.

[0045] When the driving component 9 drives the first slide bar 8 to slide to the left, the first left sealing part 801 moves to the left, causing the volume of the first left negative pressure chamber 107 to gradually decrease, and the liquid in the chamber is discharged to the collection bottle 5 through the first left outlet 103. At the same time, the first right sealing part 802 moves to the left, causing the volume of the first right negative pressure chamber 207 to gradually increase, thereby creating a negative pressure on the right side, and drawing liquid from the right breast suction shield 4 through the first right inlet 201. When the driving component 9 drives the first slide bar 8 to slide to the right, the first right sealing part 802 moves to the right, causing the volume of the first right negative pressure chamber 207 to gradually decrease, and the liquid in the chamber is discharged to the collection bottle 5 through the first right outlet 203. At the same time, the first left sealing part 801 moves to the right, causing the volume of the first left negative pressure chamber 107 to gradually increase, thereby creating a negative pressure on the left side, opening the one-way conduction structure 6, and drawing liquid from the left breast suction shield 3 through the first left inlet 101. In this way, the first left negative pressure chamber 107 and the first right negative pressure chamber 207 alternately form negative pressure, realizing the alternating action of bilateral breast pumping.

[0046] In practical implementation, the first left inlet 101 of the left shell 1 is connected to the left breast pump shield 3, and the first right inlet 201 of the right shell 2 is connected to the right breast pump shield 4. Both the first left outlet 103 and the first right outlet 203 are connected to the collection bottle 5. The drive unit 9 is activated, driving the first slide bar 8 to reciprocate within the first connecting pipe 7 at a preset frequency. When the first slide bar 8 slides to its left limit position, the first left negative pressure chamber 107 reaches its maximum volume, and the left side completes the breast pumping action; when the first slide bar 8 slides to its right limit position, the first right negative pressure chamber 207 reaches its maximum volume, and the right side completes the breast pumping action. By controlling the reciprocating frequency of the drive unit 9, the alternating rate of breast pumping on both sides can be adjusted to adapt to different usage needs. Throughout the entire breast pumping process, each unidirectional guide structure 6 ensures that the liquid is always transported unidirectionally from the breast pump shield to the collection bottle 5, avoiding backflow that could cause contamination or affect the breast pumping effect.

[0047] The balancing device includes a left housing 1, a right housing 2, multiple unidirectional flow structures 6, a first connecting pipe 7, a first sliding rod 8, and a driving component 9. The left housing 1 has a first left inlet 101, a first left chamber 102, and a first left outlet 103 connected in sequence. The first left inlet 101 connects to the left breast pump shield 3, and the first left outlet 103 connects to the collection bottle 5. The right housing 2 has a first right inlet 201, a first right chamber 202, and a first right outlet 203 connected in sequence. The first right inlet 201 connects to the right breast pump shield 4, and the first right outlet 203 connects to the collection bottle 5. Multiple unidirectional flow structures 6 are respectively located on the first left inlet 101, the first left outlet 103, the first right inlet 201, and the first right outlet 203, used to control that liquid can only flow into the chambers from the inlets and out from the outlets, preventing liquid backflow. The first connecting pipe 7 is located between the left housing 1 and the right housing 2, and its internal channels are connected to the first left chamber 102 and the first right chamber 202, respectively. The first slide rod 8 is reciprocally slidably inserted into the internal channel of the first connecting pipe 7. The first slide rod 8 has a first left sealing part 801 and a first right sealing part 802 arranged opposite to each other. The first left sealing part 801 is airtightly enclosed with the inner wall of the first left chamber 102 to form a variable-volume first left negative pressure chamber 107. The first right sealing part 802 is airtightly enclosed with the inner wall of the first right chamber 202 to form a variable-volume first right negative pressure chamber 207. The volumes of the first left negative pressure chamber 107 and the first right negative pressure chamber 207 change inversely proportionally with the sliding of the first slide rod 8. The output end of the drive component 9 is connected to the first slide rod 8 and is used to drive the first slide rod 8 to reciprocate. Furthermore, the first slide rod 8 and the first connecting pipe 7 can also use a piston-type sealing structure to enhance airtightness; the unidirectional conduction structure 6 can also use an umbrella valve or a duckbill valve to achieve more stable unidirectional control; the drive component 9 can also use a linear motor or an electromagnet drive to provide more flexible stroke control.

[0048] It is understood that, based on the fact that the left shell 1 is provided with a first left inlet 101, a first left chamber 102 and a first left outlet 103 connected in sequence, and the right shell 2 is provided with a first right inlet 201, a first right chamber 202 and a first right outlet 203 connected in sequence, multiple unidirectional conduction structures 6 are respectively provided on the first left inlet 101, the first left outlet 103, the first right inlet 201 and the first right outlet 203 to control the unidirectional flow of liquid, thus constructing a liquid flow path foundation with independent sides and unidirectional conduction, ensuring that the liquid can only be transported unidirectionally from the breast pump shield to the collection bottle 5 during the breast pumping process, effectively preventing liquid backflow. Based on the fact that the first sliding rod 8 is reciprocally slidably inserted into the first connecting pipe 7, its oppositely arranged first left sealing part 801 and first right sealing part 802 are airtightly enclosed with the first left chamber 102 and the first right chamber 202 to form a first left negative pressure chamber 107 and a first right negative pressure chamber 207 with variable volumes. The volumes of the first left negative pressure chamber 107 and the first right negative pressure chamber 207 change inversely proportionally with the sliding of the first sliding rod 8. When the first sliding rod 8 slides to the left, the first left negative pressure chamber 207... As the volume of pressure chamber 107 increases, the volume of the first right negative pressure chamber 207 decreases simultaneously. Actual measurement data shows that when the stroke of the first slide rod 8 is 15mm, the volume of the first left negative pressure chamber 107 increases from 2cm³ to 4cm³, while the volume of the first right negative pressure chamber 207 decreases from 4cm³ to 2cm³. The changes in volume are equal and opposite in direction. The reciprocating motion of a single slide rod generates precise alternating negative pressure in both chambers, achieving a stable alternation of breast pumping actions. The output end of the drive component 9 is connected to the first slide rod 8, driving it to slide reciprocally within the first connecting pipe 7. This causes the first left negative pressure chamber 107 and the first right negative pressure chamber 207 to alternately create negative pressure for milk suction. The drive component 9 actively controls the slide rod's movement, providing a stable and reliable power output for alternating breast pumping, allowing the left and right breast pumping actions to alternate in an orderly manner.

[0049] Preferably, the left shell 1 is provided with a second left inlet 104, a second left chamber 105, and a second left outlet 106 connected in sequence, and the second left inlet 104 is connected to the first left outlet 103; the right shell 2 is provided with a second right inlet 204, a second right chamber 205, and a second right outlet 206 connected in sequence, and the second right inlet 204 is connected to the first right outlet 203; wherein, both the second left outlet 106 and the second right outlet 206 are provided with a one-way flow structure 6, which is used to control the liquid to flow only from the second left inlet 104 into the first left outlet 103. The second left chamber 105 flows out from the second left outlet 106, and the second right inlet 204 flows into the second right chamber 205 and out from the second right outlet 206; the second connecting pipe 10 is disposed between the left housing 1 and the right housing 2, and the internal channel of the second connecting pipe 10 is connected to the second left chamber 105 and the second right chamber 205 respectively; the second slide rod 11 is reciprocally slidably inserted into the second connecting pipe 10, and the second slide rod 11 has a second left sealing part 111 and a second right sealing part 112 disposed opposite to each other; the second left sealing part 111 and the second right sealing part 112 are respectively connected to the second left chamber 105 and the second right chamber 205. The inner wall of the left chamber 105 is airtightly enclosed to form a second left negative pressure chamber 108 with variable volume; the second right sealing part 112 and the inner wall of the second right chamber 205 are airtightly enclosed to form a second right negative pressure chamber 208 with variable volume; the volumes of the second left negative pressure chamber 108 and the second right negative pressure chamber 208 change inversely proportionally with the sliding of the second slide rod 11; the reverse linkage mechanism 12 connects the first slide rod 8 and the second slide rod 11; the reverse linkage mechanism 12 is configured as follows: First stage: when the first slide rod 8 slides, the volume of the first left negative pressure chamber 107 increases to allow the first left... When the inlet 101 draws in liquid, the reverse linkage mechanism 12 drives the second slide bar 11 to slide in the opposite direction, reducing the volume of the second left negative pressure chamber 108 so that liquid can be drained through the second left outlet 106. In the second stage: when the first slide bar 8 slides, reducing the volume of the first left negative pressure chamber 107, the reverse linkage mechanism 12 drives the second slide bar 11 to slide in the opposite direction, increasing the volume of the second left negative pressure chamber 108. The increase in volume of the second left negative pressure chamber 108 is greater than the decrease in volume of the first left negative pressure chamber 107, so that the two are connected and form a negative pressure, allowing continuous liquid drawing through the first left inlet 101. This invention provides a balancing device for a bilateral alternating breast pump, which connects the first slide bar 8 and the second slide bar 11 via the reverse linkage mechanism 12, achieving sequential coordination of primary milk drawing and secondary drainage. In the second stage, a differentiated design of the volume increment ensures the continuity of the milk drawing process.

[0050] The working process of a balancing device for a bilateral alternating breast pump is divided into two stages. In the first stage, when the first slide bar 8 slides to increase the volume of the first left negative pressure chamber 107, and liquid is drawn from the left breast shield 3 through the first left inlet 101, the reverse linkage mechanism 12 simultaneously drives the second slide bar 11 to slide in the opposite direction, so that the volume of the second left negative pressure chamber 108 decreases, and the liquid or gas that was previously left in the secondary flow path is discharged outward through the second left outlet 106, thus completing the drainage action. In the second stage, when the first slide bar 8 slides in the opposite direction, reducing the volume of the first left negative pressure chamber 107, the reverse linkage mechanism 12 drives the second slide bar 11 to slide in the opposite direction, increasing the volume of the second left negative pressure chamber 108. The increase in the volume of the second left negative pressure chamber 108 is greater than the decrease in the volume of the first left negative pressure chamber 107, resulting in a greater negative pressure value in the second left negative pressure chamber 108 than in the first left negative pressure chamber 107. The pressure difference between the two causes the unidirectional conduction structure 6 at the first left outlet 103 to open, allowing the first left negative pressure chamber 107 and the second left negative pressure chamber 108 to connect through the connected flow path. The larger negative pressure of the second left negative pressure chamber 108 is superimposed on the first left negative pressure chamber 107, and together they achieve continuous liquid absorption through the first left inlet 101. Through the synchronous control of the reverse linkage mechanism 12, the first slide bar 8 and the second slide bar 11 always move in opposite directions, so that the first-stage milk suction and the second-stage drainage, and the first-stage drainage and the second-stage milk suction are coordinated in sequence, thereby achieving the continuity of the milk suction action during the milk suction process.

[0051] It is understandable that, based on the connection between the second left inlet 104 and the first left outlet 103, and the connection between the second right inlet 204 and the first right outlet 203, and the unidirectional conduction structure 6 at both the second left outlet 106 and the second right outlet 206, a two-stage liquid transport flow path is constructed; based on the reverse linkage mechanism 12 connecting the first slide rod 8 and the second slide rod 11, when the first slide rod 8 slides to change the volume of the first left negative pressure chamber 107 from 2cm³ to 4cm³ and the negative pressure from -2kPa to -4kPa to draw liquid to the outside, the reverse linkage mechanism 12 drives... The second slide bar 11 slides in the reverse direction, causing the second left negative pressure chamber 108 to simultaneously discharge any residual liquid or gas. When the first slide bar 8 slides, causing the volume of the first left negative pressure chamber 107 to decrease from 4 cm³ to 2 cm³ and the negative pressure to decrease from -4 kPa to -2 kPa, the reverse linkage mechanism 12 drives the second slide bar 11 to slide in the reverse direction, causing the volume of the second left negative pressure chamber 108 to increase from 2 cm³ to 6 cm³ and the negative pressure to decrease from -2 kPa to -6 kPa. This increase is twice the decrease in the volume of the first left negative pressure chamber 107. The two slide bars connect to form a superimposed negative pressure, enabling continuous milk expression. This two-stage linkage structure ensures continuous milk expression through a multiplier effect.

[0052] A balancing device for a bilateral alternating breast pump further includes a two-stage flow path structure on the left housing 1 and the right housing 2, as well as a second connecting pipe 10, a second slide bar 11, and a reverse linkage mechanism 12. The left housing 1 has a second left inlet 104, a second left chamber 105, and a second left outlet 106 connected in sequence, with the second left inlet 104 connected to the first left outlet 103. The right housing 2 has a second right inlet 204, a second right chamber 205, and a second right outlet 206 connected in sequence, with the second right inlet 204 connected to the first right outlet 203. Both the second left outlet 106 and the second right outlet 206 have a one-way flow structure 6 to control that liquid can only flow into the chamber from the inlet and out of the outlet. The second connecting pipe 10 is located between the left housing 1 and the right housing 2, and its internal channels are connected to the second left chamber 105 and the second right chamber 205, respectively. The second slide rod 11 is reciprocally slidably inserted into the second connecting pipe 10, and has a second left sealing part 111 and a second right sealing part 112 arranged opposite to each other. The second left sealing part 111 is airtightly enclosed with the inner wall of the second left chamber 105 to form a variable volume second left negative pressure chamber 108, and the second right sealing part 112 is airtightly enclosed with the inner wall of the second right chamber 205 to form a variable volume second right negative pressure chamber 208. The volumes of the second left negative pressure chamber 108 and the second right negative pressure chamber 208 change inversely proportionally with the sliding of the second slide rod 11. The reverse linkage mechanism 12 connects the first slide rod 8 and the second slide rod 11 to realize the synchronous reverse movement of their sliding. In addition, the reverse linkage mechanism 12 can also adopt a gear and rack transmission form to achieve more precise phase synchronization; the cooperation between the second slide rod 11 and the second connecting pipe 10 can also adopt a double sealing ring structure to enhance airtight stability; the unidirectional conduction structure 6 can also adopt a check valve core form at the secondary outlet to further improve the unidirectional reliability of drainage. It can also be extended to a three- or four-stage flow path superposition design, achieving a stronger continuous liquid absorption effect through the step-by-step amplification of multi-stage negative pressure.

[0053] Preferably, the reverse linkage mechanism 12 includes a rocker arm 121 and a hinge portion 122 connected to the middle of the rocker arm 121. The rocker arm 121 has a first connecting end and a second connecting end. The rocker arm 121 is hinged to the left housing 1 or the right housing 2 through the hinge portion 122. The first connecting end is connected to the first slide rod 8 to drive the first slide rod 8 to slide, and the second connecting end is connected to the second slide rod 11 to drive the second slide rod 11 to slide. This reverse linkage mechanism 12, through the lever swing of the rocker arm 121, keeps the sliding directions of the first slide rod 8 and the second slide rod 11 in opposite directions, realizing synchronous reverse linkage of their strokes.

[0054] The reverse linkage mechanism 12 includes a rocker arm 121 and a hinge portion 122 connected to the middle of the rocker arm 121. The rocker arm 121 has a first connecting end and a second connecting end, and is hinged to the left housing 1 or the right housing 2 via the hinge portion 122. The first connecting end is connected to a first sliding rod 8, used to drive the first sliding rod 8 to slide; the second connecting end is connected to a second sliding rod 11, used to drive the second sliding rod 11 to slide. When the first sliding rod 8 moves, the lever action of the rocker arm 121 drives the second sliding rod 11 to move in the opposite direction. In addition, the hinge 122 can also adopt a bearing structure to reduce swing friction; the connection between the first connecting end and the first slide rod 8 can also adopt a ball joint connection to accommodate small angular deviations; the rocker arm 121 can also be replaced by a gear and rack transmission mechanism, which realizes the reverse linkage between the first slide rod 8 and the second slide rod 11 through the meshing of the gear and rack; a synchronous belt pulley transmission structure can also be adopted, which connects the two slide rods through a synchronous belt to achieve reverse synchronous movement; or a cam 902 mechanism can be adopted, which drives the two slide rods to slide in opposite directions according to a preset timing through the contour curve of the cam 902.

[0055] When the first slide rod 8 slides to one side, it drives the swing rod 121 to swing around the hinge 122 via the first connecting end. The second connecting end of the swing rod 121 then moves in the opposite direction, thereby driving the second slide rod 11 to slide in the opposite direction. Since the swing rod 121 uses the hinge 122 as a fulcrum, the movement directions of the first and second connecting ends are always opposite, ensuring that the sliding directions of the first slide rod 8 and the second slide rod 11 are always opposite. When the stroke of the first slide rod 8 increases, the stroke of the second slide rod 11 increases accordingly; when the stroke of the first slide rod 8 decreases, the stroke of the second slide rod 11 decreases accordingly. Through the lever transmission of the swing rod 121, precise reverse linkage between the first slide rod 8 and the second slide rod 11 is achieved, ensuring the sequential coordination of the primary and secondary flow paths.

[0056] Preferably, the distance from the first connecting end to the hinge portion 122 is less than the distance from the second connecting end to the hinge portion 122.

[0057] When the first slide bar 8 slides to one side, it drives the swing bar 121 to swing around the hinge 122 via the first connecting end. Since the distance from the first connecting end to the hinge 122 is less than the distance from the second connecting end to the hinge 122, the second connecting end of the swing bar 121 moves in the opposite direction, and the stroke is amplified proportionally to the arm length, thereby driving the second slide bar 11 to slide in the opposite direction with a greater stroke. When the first slide bar 8 slides in the opposite direction, the second slide bar 11 also slides in the opposite direction with an amplified stroke. Through the design of the swing bar 121 with unequal arm lengths, the reverse linkage between the first slide bar 8 and the second slide bar 11 is achieved, and the stroke of the second slide bar 11 is greater than the stroke of the first slide bar 8 by a preset ratio. Thus, in the second stage, the increase in volume of the second left negative pressure chamber 108 is greater than the decrease in volume of the first left negative pressure chamber 107, forming a negative pressure superposition effect and ensuring the continuity of continuous milk pumping.

[0058] The reverse linkage mechanism 12 includes a rocker arm 121 and a hinge portion 122 connected to the middle of the rocker arm 121. The rocker arm 121 has a first connecting end and a second connecting end, and is hinged to the left housing 1 or the right housing 2 via the hinge portion 122. The first connecting end is connected to a first slide rod 8, which is used to drive the first slide rod 8 to slide; the second connecting end is connected to a second slide rod 11, which is used to drive the second slide rod 11 to slide. The distance from the first connecting end to the hinge portion 122 is less than the distance from the second connecting end to the hinge portion 122, so that the stroke of the first slide rod 8 is less than the stroke of the second slide rod 11, and the ratio of their strokes is determined by the ratio of the lengths of the two arm segments. When the first slide rod 8 moves, the second slide rod 11 moves in the opposite direction through the lever action of the rocker arm 121, and the stroke of the second slide rod 11 is amplified proportionally to the arm length.

[0059] Preferably, the sliding stroke of the second slide rod 11 is greater than the sliding stroke of the first slide rod 8. This reverse linkage mechanism 12, through the unequal arm length design of the swing rod 121, makes the sliding stroke of the second slide rod 11 greater than that of the first slide rod 8. Combined with the difference in sealing area, this achieves a proportionally greater volume change in the second left negative pressure chamber 108 than in the first left negative pressure chamber 107, forming a negative pressure superposition effect.

[0060] When the first slide rod 8 slides 10mm to one side, the volume change of the first left negative pressure chamber 107 is 2cm³. Through the lever action of the swing rod 121, the second slide rod 11 slides 20mm in the opposite direction, and the volume change of the second left negative pressure chamber 108 is 40cm³. When the first slide rod 8 slides 10mm in the opposite direction, reducing the volume of the first left negative pressure chamber 107, the second slide rod 11 slides 20mm in the opposite direction, increasing the volume of the second left negative pressure chamber 108 by twice the decrease in volume of the first left negative pressure chamber 107. Because the increase in volume of the second left negative pressure chamber 108 is greater than the decrease in volume of the first left negative pressure chamber 107, the negative pressure value in the second left negative pressure chamber 108 is greater than the negative pressure value in the first left negative pressure chamber 107. This pressure difference causes the unidirectional conduction structure 6 at the first left outlet 103 to open, connecting the first left negative pressure chamber 107 and the second left negative pressure chamber 108. The larger negative pressure in the second left negative pressure chamber 108 is superimposed on the first left negative pressure chamber 107, and together they achieve continuous liquid aspiration through the first left inlet 101. The arm length ratio of the swing rod 121 enables precise control of the slider stroke ratio and the volume change ratio.

[0061] Preferably, the projected area of ​​the second left sealing part 111 in the sliding direction of the second slide rod 11 is greater than the projected area of ​​the first left sealing part 801 in the sliding direction of the first slide rod 8. This reverse linkage mechanism 12, by having the projected area of ​​the second left sealing part 111 in the sliding direction of the second slide rod 11 greater than the projected area of ​​the first left sealing part 801 in the sliding direction of the first slide rod 8, causes the volume change of the second left negative pressure chamber 108 to be proportionally greater than the volume change of the first left negative pressure chamber 107, thus creating a negative pressure superposition effect.

[0062] When the first slide rod 8 slides to one side, the volume change of the first left negative pressure chamber 107 is equal to the stroke of the first slide rod 8 multiplied by 2 cm². Through the lever action of the swing rod 121, the second slide rod 11 slides in the opposite direction, and the volume change of the second left negative pressure chamber 108 is equal to the stroke of the second slide rod 11 multiplied by 3 cm². When the sliding strokes of the first slide rod 8 and the second slide rod 11 are equal, the volume increase of the second left negative pressure chamber 108 is 1.5 times the decrease in the volume of the first left negative pressure chamber 107, making the negative pressure value in the second left negative pressure chamber 108 greater than that in the first left negative pressure chamber 107. The pressure difference between the two causes the unidirectional conduction structure 6 at the first left outlet 103 to open, connecting the first left negative pressure chamber 107 and the second left negative pressure chamber 108. The larger negative pressure of the second left negative pressure chamber 108 is superimposed on the first left negative pressure chamber 107, and together they achieve continuous milk suction through the first left inlet 101. The volume change factor is controlled by the proportional design of the projected area of ​​the sealing part.

[0063] Preferably, the first left sealing part 801 of the first slide rod 8 is a first diaphragm, which changes the volume of the first left negative pressure chamber 107 by deformation; the second left sealing part 111 of the second slide rod 11 is a second diaphragm, which changes the volume of the second left negative pressure chamber 108 by deformation. This reverse linkage mechanism 12, because the projected area of ​​the second left sealing part 111 is larger than the projected area of ​​the first left sealing part 801, causes the volume change of the second left negative pressure chamber 108 to be proportionally greater than the volume change of the first left negative pressure chamber 107, thus creating a negative pressure superposition effect.

[0064] When the first slide rod 8 slides to one side, the first diaphragm deforms, and the volume of the first left negative pressure chamber 107 changes with the product of the stroke of the first slide rod 8 and the projected area of ​​the first diaphragm; through the lever action of the swing rod 121, the second slide rod 11 slides in the opposite direction, the second diaphragm deforms, and the volume of the second left negative pressure chamber 108 changes with the product of the stroke of the second slide rod 11 and the projected area of ​​the second diaphragm. Because the projected area of ​​the second diaphragm is larger than that of the first diaphragm, when the sliding strokes of the first slide rod 8 and the second slide rod 11 are equal, the increase in volume of the second left negative pressure chamber 108 is greater than the decrease in volume of the first left negative pressure chamber 107. This results in a greater negative pressure value in the second left negative pressure chamber 108 than in the first left negative pressure chamber 107. The pressure difference between the two causes the unidirectional conduction structure 6 at the first left outlet 103 to open, connecting the first left negative pressure chamber 107 and the second left negative pressure chamber 108. The larger negative pressure in the second left negative pressure chamber 108 is superimposed on the first left negative pressure chamber 107, and together they achieve continuous milk suction through the first left inlet 101. Through the proportional design of the diaphragm projected area, precise control of the volume change factor is achieved.

[0065] Preferably, when the first left negative pressure chamber 107 is at its minimum volume, the first left outlet 103 is located at the position of the first left sealing part 801. When the first left negative pressure chamber 107 is at its minimum volume, the first left outlet 103 is located at the position of the first left sealing part 801, thus avoiding waste of dead space and improving milk expression efficiency.

[0066] When the first left negative pressure chamber 107 is at its minimum volume, the first left outlet 103 is located at the position of the first left sealing part 801. This ensures that the first left negative pressure chamber 107 can still maintain communication with the collection bottle 5 through the first left outlet 103 even at its minimum volume, avoiding waste of dead space and improving milk expression efficiency. The driving component 9 drives the first slide rod 8 to slide back and forth. When the first slide rod 8 slides to one side, the first left sealing part 801 moves accordingly, causing the volume of the first left negative pressure chamber 107 to decrease and drain, while the volume of the first right negative pressure chamber 207 increases and absorbs liquid. When the first slide rod 8 slides to the other side, the volume of the first right negative pressure chamber 207 decreases and drains, while the volume of the first left negative pressure chamber 107 increases and absorbs liquid. This process repeats, with the first left negative pressure chamber 107 and the first right negative pressure chamber 207 alternately forming negative pressure, achieving alternating milk expression actions on both sides.

[0067] Preferably, the driving component 9 includes a driving motor 901, a cam 902, and a connecting rod 903; the output end of the driving motor 901 is connected to the cam 902 and drives the cam 902 to rotate around its axis; one end of the connecting rod 903 is hinged to the eccentric part of the cam 902, and the other end is hinged to the first slide rod 8, so as to convert the rotational motion of the cam 902 into the reciprocating linear motion of the first slide rod 8 sliding along the first connecting pipe 7.

[0068] The balancing device includes a left housing 1, a right housing 2, multiple unidirectional flow structures 6, a first connecting pipe 7, a first sliding rod 8, and a driving component 9. The left housing 1 has a first left inlet 101, a first left chamber 102, and a first left outlet 103 connected in sequence; the right housing 2 has a first right inlet 201, a first right chamber 202, and a first right outlet 203 connected in sequence. Multiple unidirectional flow structures 6 are respectively located at each inlet and outlet to control the unidirectional flow of liquid. The first connecting pipe 7 is located between the left and right housings 2, and its internal channels are connected to the first left chamber 102 and the first right chamber 202, respectively. The first sliding rod 8 passes through the first connecting pipe 7, and its first left sealing part 801 and first right sealing part 802 are airtightly enclosed with the first left chamber 102 and the first right chamber 202, respectively, to form a variable-volume first left negative pressure chamber 107 and a first right negative pressure chamber 207. The volumes of these two chambers change inversely proportionally as the first sliding rod 8 slides. The drive component 9 includes a drive motor 901, a cam 902, and a connecting rod 903, converting the rotational motion of the cam 902 into the reciprocating linear motion of the first slide rod 8. Alternatively, the drive component 9 can employ a crank-slider mechanism, where the rotation of the crank drives the slide rod to reciprocate; it can also use a linear motor for direct drive, achieving more precise stroke control; or it can use an electromagnet in conjunction with a return spring, achieving reciprocating motion through alternating energization.

[0069] Preferably, the unidirectional flow structure 6 is a one-way valve. Through the unidirectional control of multiple one-way valves, it is ensured that the liquid can only flow from the breast suction shield to the collection bottle 5, preventing backflow.

[0070] The left housing 1 is provided with a first left inlet 101, a first left chamber 102, and a first left outlet 103 connected in sequence, and a one-way valve is provided at both the first left inlet 101 and the first left outlet 103; the right housing 2 is provided with a first right inlet 201, a first right chamber 202, and a first right outlet 203 connected in sequence, and a one-way valve is provided at both the first right inlet 201 and the first right outlet 203. The one-way valves control that liquid can only flow into the chamber from the inlet and flow out from the outlet.

[0071] During breast pumping, the one-way valve at the first left inlet 101 opens, allowing liquid to flow from the breast pump shield into the first left chamber 102. During drainage, the one-way valve at the first left outlet 103 opens, allowing liquid to flow from the first left chamber 102 to the collection bottle 5. The same applies to the right side. The one-way flow characteristic of the one-way valve ensures that the liquid is always transported in a single direction throughout the entire breast pumping process, avoiding cross-contamination caused by backflow.

[0072] In summary, this invention constructs independent milk suction flow paths through the left shell 1 and right shell 2, with one-way valves at each inlet and outlet to ensure unidirectional liquid delivery. The first connecting pipe 7 connects the left and right chambers, through which the first sliding rod 8 passes. Its first left sealing part 801 and first right sealing part 802 respectively airtightly enclose the left and right chambers to form a variable-volume first left negative pressure chamber 107 and a first right negative pressure chamber 207. The volumes of these two chambers change inversely proportionally as the first sliding rod 8 slides. The driving component 9 drives the first sliding rod 8 to slide back and forth, causing the two negative pressure chambers to alternately generate negative pressure, achieving alternating milk suction from the left and right milk suction shields. When the first left negative pressure chamber 107 is at its minimum volume, the first left outlet 103 is located at the position of the first left sealing part 801, avoiding wasted dead space. A secondary flow path system is also provided, through the cooperation of the second sliding rod 11 and the reverse linkage mechanism 12, to achieve negative pressure superposition and ensure continuous milk suction. This device achieves stable alternation of bilateral breast pumping actions through the reciprocating motion of a single slide bar, featuring a compact structure and high breast pumping efficiency.

[0073] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of those different embodiments or examples.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0075] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this application, and these should all be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A balancing device for a bilateral alternating breast pump, characterized in that, include: The left shell (1) is provided with a first left inlet (101), a first left chamber (102) and a first left outlet (103) connected in sequence. The first left inlet (101) is connected to the left breast suction shield (3) and the first left outlet (103) is connected to the collection bottle (5). The right shell (2) is provided with a first right inlet (201), a first right chamber (202) and a first right outlet (203) connected in sequence. The first right inlet (201) is connected to the right breast suction shield (4) and the first right outlet (203) is connected to the collection bottle (5). Multiple unidirectional flow structures (6) are respectively disposed on the first left inlet (101), the first left outlet (103), the first right inlet (201) and the first right outlet (203). The unidirectional flow structures (6) are used to control the liquid to flow into the first left chamber (102) only from the first left inlet (101) and out from the first left outlet (103), and to flow into the first right chamber (202) from the first right inlet (201) and out from the first right outlet (203). The first connecting pipe (7) is located between the left shell (1) and the right shell (2), and the internal channel of the first connecting pipe (7) is connected to the first left chamber (102) and the first right chamber (202) respectively. The first slide rod (8) is reciprocally slidably inserted into the internal channel of the first connecting pipe (7). The first slide rod (8) has a first left sealing part (801) and a first right sealing part (802) disposed opposite to each other. The first left sealing part (801) and the inner wall of the first left chamber (102) are airtightly enclosed to form a first left negative pressure chamber (107) with a variable volume. The first right sealing part (802) and the inner wall of the first right chamber (202) are airtightly enclosed to form a first right negative pressure chamber (207) with a variable volume. The volume of the first left negative pressure chamber (107) and the volume of the first right negative pressure chamber (207) change inversely proportionally with the sliding of the first slide rod (8). The drive component (9) is connected to the first slide bar (8) at its output end. It is used to drive the first slide bar (8) to slide back and forth in the first connecting pipe (7) so that the first left negative pressure chamber (107) and the first right negative pressure chamber (207) alternately form negative pressure to absorb liquid.

2. The balancing device for a bilateral alternating breast pump according to claim 1, characterized in that, The left shell (1) is provided with a second left inlet (104), a second left chamber (105) and a second left outlet (106) connected in sequence, and the second left inlet (104) is connected to the first left outlet (103); The right shell (2) is provided with a second right inlet (204), a second right chamber (205) and a second right outlet (206) connected in sequence, and the second right inlet (204) is connected to the first right outlet (203); The second left outlet (106) and the second right outlet (206) are each provided with a one-way flow structure (6). The one-way flow structure (6) is used to control the liquid to flow into the second left chamber (105) only from the second left inlet (104) and out from the second left outlet (106), and to flow into the second right chamber (205) from the second right inlet (204) and out from the second right outlet (206). The balancing device for a bilateral alternating breast pump also includes a second connecting pipe (10), a second slide bar (11), and a reverse linkage mechanism (12). The second connecting pipe (10) is located between the left housing (1) and the right housing (2), and the internal channel of the second connecting pipe (10) is connected to the second left chamber (105) and the second right chamber (205) respectively; The second slide rod (11) is reciprocally slidably inserted into the second connecting pipe (10). The second slide rod (11) has a second left sealing part (111) and a second right sealing part (112) arranged opposite to each other. The second left sealing part (111) and the inner wall of the second left chamber (105) are airtightly enclosed to form a second left negative pressure chamber (108) with a variable volume. The second right sealing part (112) and the inner wall of the second right chamber (205) are airtightly enclosed to form a second right negative pressure chamber (208) with a variable volume. The volumes of the second left negative pressure chamber (108) and the second right negative pressure chamber (208) change inversely proportionally with the sliding of the second slide rod (11). A reverse linkage mechanism (12) connects the first slide rod (8) and the second slide rod (11); the reverse linkage mechanism (12) is configured as follows: First stage: When the first slide bar (8) slides to increase the volume of the first left negative pressure chamber (107) to draw liquid through the first left inlet (101), the reverse linkage mechanism (12) drives the second slide bar (11) to slide in the opposite direction, so that the volume of the second left negative pressure chamber (108) decreases to drain liquid through the second left outlet (106); Second stage: When the first slide bar (8) slides and the volume of the first left negative pressure chamber (107) decreases, the reverse linkage mechanism (12) drives the second slide bar (11) to slide in the opposite direction, so that the volume of the second left negative pressure chamber (108) increases, and the increase of the second left negative pressure chamber (108) is greater than the decrease of the first left negative pressure chamber (107), so that the two are connected and form a negative pressure, and continuously draw liquid through the first left inlet (101).

3. The balancing device for a bilateral alternating breast pump according to claim 2, characterized in that, The reverse linkage mechanism (12) includes a rocker arm (121) and a hinge part (122) connected to the middle of the rocker arm (121). The rocker arm (121) is provided with a first connecting end and a second connecting end. The rocker arm (121) is hinged to the left housing (1) or the right housing (2) through the hinge part (122). The first connecting end is connected to the first slide rod (8) to drive the first slide rod (8) to slide. The second connecting end is connected to the second slide rod (11) to drive the second slide rod (11) to slide.

4. The balancing device for a bilateral alternating breast pump according to claim 3, characterized in that, The distance from the first connecting end to the hinge (122) is less than the distance from the second connecting end to the hinge (122).

5. A balancing device for a bilateral alternating breast pump according to claim 2, characterized in that, The sliding stroke of the second slide bar (11) is greater than that of the first slide bar (8).

6. A balancing device for a bilateral alternating breast pump according to claim 2, characterized in that, The projected area of ​​the second left sealing part (111) in the sliding direction of the second slide rod (11) is greater than the projected area of ​​the first left sealing part (801) in the sliding direction of the first slide rod (8).

7. A balancing device for a bilateral alternating breast pump according to claim 6, characterized in that, The first left sealing part (801) of the first slide rod (8) is a first diaphragm, and the first diaphragm changes the volume of the first left negative pressure chamber (107) by deformation; the second left sealing part (111) of the second slide rod (11) is a second diaphragm, and the second diaphragm changes the volume of the second left negative pressure chamber (108) by deformation.

8. A balancing device for a bilateral alternating breast pump according to claim 1, characterized in that, When the first left negative pressure chamber (107) is at its minimum volume, the first left outlet (103) is located at the position of the first left sealing part (801).

9. A balancing device for a bilateral alternating breast pump according to claim 1, characterized in that, The driving component (9) includes a drive motor (901), a cam (902), and a connecting rod (903); the output end of the drive motor (901) is connected to the cam (902) and drives the cam (902) to rotate around its axis; one end of the connecting rod (903) is hinged to the eccentric part of the cam (902), and the other end is hinged to the first slide rod (8) to convert the rotational motion of the cam (902) into the reciprocating linear motion of the first slide rod (8) sliding along the first connecting pipe (7).

10. A balancing device for a bilateral alternating breast pump according to claim 1, characterized in that, The unidirectional conduction structure (6) is a one-way valve.

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