CN114796660A - Method for fine adjustment of air pressure of piston pump of breast pump - Google Patents

Abstract

The invention discloses a method for finely adjusting the air pressure of a piston pump of a breast pump, which comprises the steps of communicating a cylinder of the piston pump with a pressure sensor and an exhaust electromagnetic valve, detecting the air pressure change in the cylinder in real time through the pressure sensor in the reciprocating exhaust and air extraction movement process of the piston pump, and controlling the switch of the exhaust electromagnetic valve to adjust the air pressure according to a set working mode. According to the method, the air pressure change in the air cylinder can be detected in real time through the pressure sensor according to the use requirement, the air pressure is accurately adjusted, and the comfortable requirements of different people on the size of the negative pressure for sucking milk are met.

Description

Method for fine adjustment of air pressure of piston pump of breast pump

Technical Field

The patent relates to the field of piston pumps, in particular to a method for finely adjusting the air pressure of a piston pump of a breast pump.

Background

The current market breast pumps adopt diaphragm pumps or piston pumps to pump air to achieve milk suction. For example, in the breast pump using the piston pump, the cylinder is connected with a three-way component of the breast shield through an air duct, the first port of the three-way component is a large bell mouth and is attached to the breast, the second port of the three-way component is a feeding bottle connected below the second port of the three-way component, the third port of the three-way component is connected with the air duct through a three-way diaphragm, the piston pump provides negative pressure, the three-way diaphragm is controlled to contract, and therefore negative pressure is formed in the breast shield to achieve breast pumping.

Patent application No. CN201880017362.8, entitled pressure relief device system and method for relieving pressure in a chamber of a reciprocator assembly, uses a deformable seal to partially disengage from a head on the return stroke of a piston to effect pressure relief.

The existing piston pump is designed to open the air discharge by touching a mechanical exhaust valve with a limit switch when a piston runs to the bottom of a cylinder, when the piston moves back to perform negative pressure air suction, the piston is separated from the limit switch, then the mechanical exhaust valve is automatically closed, the limit switch and the mechanical exhaust valve are of an integrated structure, the control mode can only simply control the air in the cylinder to be completely discharged or the valve is closed to perform air suction in a piston stroke period, the air pressure can be adjusted by closing the air discharge at any position of the cylinder by the control piston which cannot be flexible, and the requirements of different groups on different negative pressure suction forces are met. For example, for a milk sucking working mode, large negative air pressure is needed, the working frequency of the pumping and discharging air is slow, and the piston is controlled to run to the bottom of the cylinder to perform pumping and discharging actions; for a mother with a large breast, for example, it is desirable that the suction force is small and comfortable; for mothers with poor mammary gland conditions, the suction force is hoped to be larger to suck the milk smoothly. If want to play slight massage effect to the breast, just need little negative pressure, it is some fast to take out and put pneumatic operating frequency, need detect the atmospheric pressure value at this moment, accurate control valve and piston motion, but current piston pump touches limit switch by the piston when moving to the cylinder bottom, and the valve just can close the gassing, is a fixed negative pressure value, can not realize the function of fine setting atmospheric pressure.

Disclosure of Invention

In order to overcome the defects of the prior art, the method for finely adjusting the air pressure of the piston pump of the breast pump can detect the air pressure change in the air cylinder in real time through the pressure sensor according to the use requirements, accurately adjust the air pressure and meet the comfortable requirements of different people on the size of the negative pressure for sucking milk.

The invention provides a method for finely adjusting the air pressure of a piston pump of a breast pump, which comprises the steps of communicating a cylinder of the piston pump with a pressure sensor and an exhaust electromagnetic valve, detecting the air pressure change in the cylinder in real time through the pressure sensor in the process of reciprocating exhaust and air extraction of a piston of the piston pump, and controlling the switch of the exhaust electromagnetic valve to adjust the air pressure according to a set working mode.

Further, the method also comprises the steps of setting the gear of the piston pump corresponding to different working modes, wherein the working modes comprise a breast pumping mode and a lactation mode; in the breast pumping mode, the negative pressure suction force generated by the piston pump is large, and the pumping frequency is low; and in the lactation mode, the negative pressure suction force generated by the piston pump is small, and the suction frequency is high.

Under the milk sucking mode, the negative pressure generated by the piston pump is 20-50KPA, and the frequency of piston suction gas is 30-80 times/minute; under the lactation mode, the negative pressure generated by the piston pump is 10-35KPA, and the air suction frequency of the piston is 150 times/min.

Furthermore, different working modes are set to correspond to different air pressure values, whether the air pressure in the air cylinder reaches the set air pressure value or not is detected in real time through the pressure sensor, and the movement of the piston pump motor and/or the opening and closing actions of the exhaust electromagnetic valve are controlled to adjust the air pressure.

Further, a maximum negative pressure protection value is set, when the pressure sensor detects that the air pressure in the air cylinder reaches the maximum negative pressure protection value in real time, the exhaust electromagnetic valve is controlled to be opened and deflated immediately, and the situation that the human body is injured due to overlarge negative pressure suction force is avoided.

Furthermore, a cylinder of the piston pump of the breast pump is connected with a three-way diaphragm of the breast shield through an air duct, negative pressure is provided by the piston pump, and the three-way diaphragm is controlled to contract, so that negative pressure is formed in the breast shield to realize breast suction.

As an implementation mode, whether the piston moves to return to the bottom of the air cylinder or not is further identified through an initial position identification switch arranged at the bottom of the air cylinder, and the air pressure is adjusted through linkage control of the switch of the exhaust electromagnetic valve.

As another improved embodiment, the device also comprises a mechanical exhaust valve arranged at the bottom of the cylinder, the mechanical exhaust valve is connected with the initial position identification switch, and when the piston is judged to move and return to the bottom of the cylinder, the mechanical exhaust valve is controlled to open and deflate in a linkage manner; and when the piston is judged to be away from the bottom of the cylinder, the mechanical exhaust valve is controlled to be closed immediately in a linkage manner.

The invention also provides a method for finely adjusting the air pressure of the piston pump of the breast pump, which comprises the steps of communicating the cylinder of the piston pump with a pressure sensor and a mechanical exhaust valve, arranging a photoelectric switch connected with the mechanical exhaust valve at the bottom of the cylinder, detecting the air pressure change in the cylinder in real time through the pressure sensor in the process of driving the piston of the piston pump to perform reciprocating exhaust and air exhaust motions by a motor of the breast pump, transmitting a signal to the motor and the photoelectric switch by the pressure sensor according to a set working mode, and cooperatively controlling the mechanical exhaust valve to switch and adjust the air pressure.

The method further comprises setting a gear of the piston pump corresponding to different working modes, wherein the working modes comprise a breast pumping mode and a milk bleeding mode; in the breast pumping mode, the negative pressure suction force generated by the piston pump is large, and the pumping frequency is low; and in the lactation mode, the negative pressure suction force generated by the piston pump is small, and the suction frequency is high. The different working modes are set to correspond to different air pressure values, whether the air pressure in the air cylinder reaches the set air pressure value or not is detected in real time through the pressure sensor, and the air pressure is adjusted by controlling the movement of the motor and/or the opening and closing action of the mechanical exhaust valve.

The scheme of the invention has the following advantages:

1. compared with the prior art, the piston pump cannot detect the air pressure change, can only simply control the air in the cylinder to be completely discharged or close the valve to exhaust in the piston stroke period, is a fixed negative pressure value, and cannot realize the function of fine adjustment of the air pressure. According to the method, the pressure sensor is combined with the exhaust electromagnetic valve, or the pressure sensor, the mechanical exhaust valve and the photoelectric switch are combined together, so that the accurate control capacity of pumping and discharging air in the whole process of piston movement can be greatly improved, the finely adjustable pressure value reaches 0.1KPA, the limitation of the traditional exhaust valve is broken through, the pressure sensor is added to monitor the change value of the air pressure in the air cylinder at any time, the valve is controlled to close and discharge air in a linkage manner, the air pressure in the negative pressure pump is finely adjusted flexibly according to the use requirement, and the requirements of different people on the size of the negative pressure suction force are met.

2. The inventor scientifically sets a plurality of gears of a piston pump by researching and testing hundreds of mothers, and the gears correspond to different working modes, wherein the working modes comprise a breast pumping mode and a lactation mode; the negative pressure value range and the air suction frequency of different working modes are scientifically determined, the negative pressure generated by the piston pump is 20-50KPA in the milk suction mode, and the air suction frequency of the piston is 30-80 times/min; under the lactation mode, the negative pressure generated by the piston pump is 10-35KPA, and the air suction frequency of the piston is 150 times/min.

Different working modes are set to correspond to different air pressure values and motor rotating speeds, and the pressure sensor is used for detecting whether the air pressure in the air cylinder reaches the set air pressure value in real time and controlling the movement of the piston pump motor and/or the opening and closing actions of the exhaust valve to adjust the air pressure. Therefore, the capacity of logically controlling the pumping and exhausting program of the piston pump and setting the waveforms of different gears can be greatly improved, the control of the full-stroke motion of the piston is more accurate, and the air pressure can be controlled at any position where the piston runs.

3. In order to prevent the user from being painful due to sudden overlarge negative pressure suction force in the milk sucking process, the scheme of the invention is also provided with a maximum negative pressure protection value, and when the pressure sensor detects that the air pressure in the air cylinder reaches the maximum negative pressure protection value in real time, the exhaust electromagnetic valve is controlled to be opened and deflated immediately, so that the situation that the overlarge negative pressure suction force causes harm to the human body is prevented. The prior breast pumps can not realize the automatic protection function.

4. As an embodiment, in order to realize high-frequency rapid alternate air-off, the air pressure is adjusted by identifying whether the piston moves to return to the bottom of the air cylinder through an initial position identification switch arranged at the bottom of the air cylinder and controlling the switch of the exhaust electromagnetic valve in a linkage manner.

5. As another improved embodiment, the device also comprises a mechanical exhaust valve arranged at the bottom of the cylinder, the mechanical exhaust valve is connected with the initial position identification switch, and when the piston is judged to move and return to the bottom of the cylinder, the mechanical exhaust valve is controlled to open and deflate in a linkage manner; and when the piston is judged to be separated from the bottom of the cylinder, the mechanical exhaust valve is controlled to be closed immediately in a linkage manner. Therefore, the mechanical exhaust valve and the exhaust electromagnetic valve are combined together to control the cylinder to close and deflate, and the closing and deflating action efficiency of the piston pump can be higher.

Drawings

FIG. 1 is a flow chart of a method for fine tuning the pump pressure of a breast pump piston according to an embodiment of the present invention.

FIG. 2 is a flow chart of a method for fine tuning the air pressure of a breast pump piston according to a third embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present patent will be further described in detail with reference to the accompanying drawings.

As shown in fig. 1, in an embodiment of the present invention, a cylinder of a breast pump piston pump is connected to a three-way diaphragm of a breast shield through an air duct, and the piston pump provides a negative pressure to control the three-way diaphragm to contract, so that the breast shield is attached to a breast, thereby forming a negative pressure in the breast shield to achieve breast pumping. The breast pump is provided with a circuit board which is respectively and electrically connected with a chip, a motor, a pressure sensor and an exhaust electromagnetic valve. The cylinder bottom of the piston pump is communicated with a pressure sensor and an exhaust electromagnetic valve, and the control process comprises the following steps: the gear of the piston pump is set, corresponding to different working modes, the motor is controlled to drive the piston to move and the exhaust electromagnetic valve to work through a preset program.

When the piston of the piston pump moves towards the bottom of the cylinder to perform the exhaust process, the pressure sensor detects the air pressure change in the cylinder in real time, the exhaust electromagnetic valve is controlled to be switched on and off to adjust the air pressure according to a set working mode, when the piston reaches the bottom of the cylinder, the exhaust electromagnetic valve is opened to be communicated with the outside to deflate, the air pressure in the cylinder, the air guide pipe and the outside air pressure are consistent, and the negative air pressure is returned to zero.

When the piston of the piston pump performs air suction movement, the exhaust electromagnetic valve is firstly closed to be communicated with the outside, the pressure sensor detects the air pressure change in the cylinder in real time, the exhaust electromagnetic valve is controlled to be switched on and off to adjust the air pressure according to a set working mode, and the piston is accurately controlled to be switched on and off at any position in the cylinder when running to different negative pressure values.

The control process for fine tuning the pump pressure of a breast pump piston is illustrated below. The function keys on the shell of the breast pump are selected to set the gears of the piston pump corresponding to different working modes, the different working modes are set corresponding to different negative pressure values and motor rotating speeds, the pressure sensor detects whether the negative pressure in the cylinder reaches a set air pressure value in real time, and the on-off action of the exhaust electromagnetic valve is controlled to adjust the air pressure.

The operating modes include a breast pumping mode and a lactation mode. In the breast pumping mode, the negative pressure suction force generated by the piston pump is large, and the suction frequency is low; multiple experiments of the inventor prove that when the negative pressure is 20-50KPA and the piston air suction frequency is 30-80 times/minute, the body feeling of a user is comfortable. Of course, the negative pressure can also be set to 30KPA, 35KPA, 40 KPA. For example, the negative pressure is controlled to be 25-45KPA, and the air suction frequency of the piston is controlled to be 35-75 times/minute, so that the body feeling is most comfortable.

For example, for a large-force breast pumping working mode, a large negative air pressure of 50KPA is needed, the gear is set to be the first gear, the piston runs to the bottom of the cylinder, the exhaust electromagnetic valve is controlled in a linkage mode to be opened and closed immediately after being completely deflated, the piston moves back to pump air, the air pressure change in the cylinder is detected in real time through the pressure sensor, the piston stops pumping air when the negative air pressure reaches 50KPA, and the whole stroke is completed.

For example, for a small-force breast pumping working mode, negative air pressure of 42KPA is needed, the gear is set to be the second gear, the piston runs to the bottom of the cylinder, the exhaust electromagnetic valve is controlled in a linkage mode to be opened and deflated and then closed immediately, the piston moves back to pump air, the air pressure change in the cylinder is detected in real time through the pressure sensor to reach a set value of 42KPA, at the moment, the piston stops moving to pump air, the piston is controlled to move towards the bottom of the cylinder immediately, the piston does not move for the whole stroke, and therefore a small negative pressure value can be obtained, and the pumped breast feels softer.

In the lactation mode, the negative pressure suction force generated by the piston pump is small, the motor speed is high, the suction frequency is high, and manual massage is simulated. For example, the suction gas frequency is 120-150 times/min, and the generated negative pressure is 10-35 KPA. For example, a lactation mode is set, negative air pressure is required to be 30KPA, the gear is set to be the third gear, the piston runs to the bottom of the cylinder, the exhaust electromagnetic valve is controlled in a linkage mode to be opened and deflated and then closed immediately, the piston moves back to draw air, the air pressure change in the cylinder is detected in real time through the pressure sensor, the set value is 30KPA, the piston does not move back to draw air, and the piston is controlled to move towards the bottom of the cylinder immediately.

Compared with the prior art, the piston of the breast pump generates continuous and regular sine wave negative pressure values in the stroke period. The method can also control the motion of the piston pump motor and/or the on-off action of the exhaust electromagnetic valve to adjust the air pressure in different stroke cycles of the piston operation to generate negative pressure value waveforms with irregular wave crests, such as saw-tooth waveforms, step waveforms and the like, so that the intermittent and different-force milk suction process of the baby can be simulated, and the baby feels more natural and gives more smooth milk.

In addition, as a unique protection measure in the scheme of the invention, in order to prevent the user from being painful due to sudden overlarge negative pressure suction force in the milk sucking process, the scheme of the invention is also provided with a maximum negative pressure protection value, such as negative air pressure 51KPA, when the pressure sensor detects that the air pressure in the air cylinder reaches the maximum negative pressure protection value in real time, the exhaust electromagnetic valve is controlled to be opened for ventilation immediately, and the situation that the overlarge negative pressure suction force causes harm to the human body is prevented. The existing breast pumps do not have the maximum negative pressure protection value, only control the piston to move up and down according to a fixed negative pressure value to pump and deflate, are unscientific and safe, and lack attention to user experience.

The second embodiment of the invention provides a method for fine adjustment of the air pressure of a piston pump of a breast pump, which is improved on the basis of the first embodiment. The breast pump also identifies whether the piston moves and returns to the bottom of the cylinder through an initial position identification switch arranged at the bottom of the cylinder. A mechanical exhaust valve is further arranged at the bottom of the cylinder and connected with the initial position identification switch, and when the piston is judged to move and return to touch the bottom of the cylinder, the mechanical exhaust valve is controlled to open and deflate in a linkage manner; and when the piston is judged to be away from the bottom of the cylinder, the mechanical exhaust valve is controlled to be closed in a linkage manner.

The mechanical exhaust valve and the exhaust electromagnetic valve are combined together to control the cylinder to close and exhaust air, and the mechanical exhaust valve is large in size and large in ventilation capacity. The exhaust solenoid valve is little, and the air output is little, and to the negative pressure value of difference, accurate control switch can all be carried out to optional position in the cylinder to the piston operation exhaust solenoid valve mainly plays the effect of a fine setting atmospheric pressure, can let the action efficiency of the gassing of closing of piston pump higher like this, realizes that the high frequency closes the gassing fast in turn, can let the tee bend diaphragm fully reset under high frequency mode to this ensures that each takes out and releases can produce sufficient negative pressure during the gas week, satisfies the requirement of different crowds to the negative pressure suckling or massage, and user experience feels good.

As shown in fig. 2, a third embodiment of the present invention provides a method for fine-tuning the air pressure of a piston pump of a breast pump, wherein the breast pump is provided with a circuit board, and the circuit board is electrically connected with a chip, a motor, a pressure sensor, a photoelectric switch and a mechanical exhaust valve respectively. Mechanical exhaust switch and photoelectric switch are two mutually independent mechanisms, and the cylinder intercommunication pressure sensor and the mechanical discharge valve of piston pump, with mechanical discharge valve connects photoelectric switch sets up in the cylinder bottom, triggers photoelectric switch when the piston moves the cylinder bottom, and mechanical discharge valve is opened in coordinated control, and when the piston left the cylinder bottom, disconnection photoelectric switch closed mechanical discharge valve. The control process comprises the following steps: the gear of the piston pump is set, corresponding to different working modes, the motor is controlled to drive the piston to move and the mechanical exhaust valve to work through a set program. The control waveform program for controlling the operation of the breast pump and the air pressure threshold value corresponding to the gear can be stored in the chip.

When the motor of the breast pump drives the piston of the piston pump to perform reciprocating exhaust and air extraction movement, the pressure sensor detects the air pressure change in the air cylinder in real time, and transmits a signal to the motor and the photoelectric switch according to a set working mode, and the mechanical exhaust valve is controlled to adjust the air pressure in a matched mode.

The method also comprises the steps of selecting a function key on the shell of the breast pump to set the gear of the piston pump, and corresponding to different working modes, wherein the working modes comprise a breast pumping mode and a lactation mode; in the breast pumping mode, the negative pressure suction force generated by the piston pump is large, and the pumping frequency is low; and in the lactation mode, the negative pressure suction force generated by the piston pump is small, and the suction frequency is high.

The different working modes are set to correspond to different air pressure values, whether the air pressure in the air cylinder reaches the set air pressure value or not is detected in real time through the pressure sensor, and the air pressure is adjusted by controlling the movement of the motor and/or the opening and closing action of the mechanical exhaust valve.

Under the milk sucking mode, when the negative pressure is 20-50KPA and the frequency of piston air suction is 30-80 times/minute, the body feeling of the user is comfortable. Of course, the negative pressure can also be set to 30KPA, 35KPA, 40 KPA. For example, the negative pressure is controlled to be 25-45KPA, and the air suction frequency of the piston is controlled to be 35-75 times/minute, so that the body feeling is most comfortable. Under the lactation mode, the negative pressure generated by the piston pump is 10-35KPA, and the air suction frequency of the piston is 150 times/min.

For example, in a low-force breast pumping working mode, negative air pressure 38KPA is needed, the gear is set as a second gear, a photoelectric switch is triggered when a piston runs to the bottom of a cylinder, a mechanical exhaust valve is opened under linkage control, the valve is closed immediately after complete deflation, the piston moves back to exhaust air, the negative air pressure change in the cylinder is detected in real time through a pressure sensor, the set value of 38KPA is reached, the piston stops moving to exhaust air, the motor rotates reversely, the piston is controlled to move towards the bottom of the cylinder immediately, the piston does not move for the whole stroke, and therefore a small negative pressure value can be obtained, and the body feeling of the pumping breast is softer.

Certainly, in order to prevent the user from being painful due to sudden overlarge negative pressure suction force in the milk sucking process, the scheme of the invention is also provided with a maximum negative pressure protection value, such as negative pressure 51KPA, when the pressure sensor detects that the air pressure in the air cylinder reaches the maximum negative pressure protection value in real time, the mechanical exhaust valve is immediately controlled to be immediately opened for ventilation, and the situation that the overlarge negative pressure suction force causes harm to a human body is prevented.

Under the lactation mode, negative air pressure 28KPA is needed, the gear is set as the third gear, a photoelectric switch is triggered when a piston runs to the bottom of a cylinder, a mechanical exhaust valve is opened through linkage control, the mechanical exhaust valve is closed immediately after complete deflation, the piston moves back to extract air, the air pressure change in the cylinder is detected in real time through a pressure sensor, the set value of 28KPA is reached, the piston does not move back to extract air, the motor rotates reversely, the piston is controlled to move towards the bottom of the cylinder at once, therefore, the running distance of the piston is shorter than that of the breast pumping working mode, the reciprocating motion frequency is higher, the reached negative pressure value is smaller, and the high-frequency low-negative-pressure massage breast feels more comfortable.

According to the method for finely adjusting the air pressure of the piston pump of the breast pump, provided by the invention, the air pressure change in the air cylinder can be detected in real time through the pressure sensor according to the use requirement, the air pressure is accurately adjusted, and the comfortable requirements of different people on the size of negative pressure for sucking milk are met.

Claims (10)

1. A method for fine tuning the air pressure of a piston pump of a breast pump comprises

The air cylinder of the piston pump is communicated with a pressure sensor and an exhaust electromagnetic valve, when the piston of the piston pump performs reciprocating exhaust and air extraction movement, the pressure sensor is used for detecting the air pressure change in the air cylinder in real time, and the exhaust electromagnetic valve is controlled to be switched on and off to adjust the air pressure according to a set working mode.

2. A method of fine tuning the air pressure of a breast pump piston pump as set forth in claim 1,

the method also comprises the steps of setting the gear of the piston pump, and corresponding to different working modes, wherein the working modes comprise a breast pumping mode and a lactation mode; in the breast pumping mode, the negative pressure suction force generated by the piston pump is large, and the pumping frequency is low; and in the lactation mode, the negative pressure suction force generated by the piston pump is small, and the suction frequency is high.

3. A method as claimed in claim 1 or 2, wherein different modes are set corresponding to different air pressure values, and the pressure sensor detects whether the air pressure in the cylinder reaches the set air pressure value in real time, and controls the movement of the motor of the piston pump and/or the on-off action of the exhaust solenoid valve to adjust the air pressure.

4. A method of fine tuning the air pressure of a breast pump piston pump as set forth in claim 2,

under the milk sucking mode, the negative pressure generated by the piston pump is 20-50KPA, and the air suction frequency of the piston is 30-80 times/minute; under the lactation mode, the negative pressure generated by the piston pump is 10-35KPA, and the air suction frequency of the piston is 150 times/min.

5. A method as claimed in claim 1 or 2, wherein a maximum negative pressure protection value is set, and when the pressure sensor detects that the air pressure in the cylinder reaches the maximum negative pressure protection value in real time, the air-bleed solenoid valve is controlled to open immediately, thereby protecting the human body.

6. A method as claimed in claim 1 or 2, wherein the air pressure is adjusted by controlling the switch of the exhaust solenoid valve in a coordinated manner by means of an initial position recognition switch provided at the bottom of the cylinder to recognize whether the piston has moved to return to the bottom of the cylinder.

7. The method of claim 6, further comprising a mechanical exhaust valve disposed at the bottom of the cylinder, connected to the initial position recognition switch, for controlling the mechanical exhaust valve to open and exhaust when the piston is determined to return to the bottom of the cylinder; and when the piston is judged to be away from the bottom of the cylinder, the mechanical exhaust valve is controlled to be closed in a linkage manner.

8. A method for fine tuning the air pressure of a piston pump of a breast pump comprises

The air cylinder of the piston pump is communicated with the pressure sensor and the mechanical exhaust valve, the photoelectric switch connected with the mechanical exhaust valve is arranged at the bottom of the air cylinder, when the motor of the breast pump drives the piston of the piston pump to perform reciprocating exhaust and air exhaust motion processes, the pressure sensor detects the air pressure change in the air cylinder in real time, and transmits a signal to the motor and the photoelectric switch to be matched with and control the mechanical exhaust valve to adjust the air pressure according to a set working mode.

9. The method of claim 8, further comprising setting the position of the piston pump to correspond to different operating modes, wherein the operating modes include a pumping mode and a bleeding mode; in the breast pumping mode, the negative pressure suction force generated by the piston pump is large, and the pumping frequency is low; and in the lactation mode, the negative pressure suction force generated by the piston pump is small, and the suction frequency is high.

10. A method of fine tuning the air pressure of a breast pump piston pump as set forth in claim 8,

the different working modes are set to correspond to different air pressure values, whether the air pressure in the air cylinder reaches the set air pressure value or not is detected in real time through the pressure sensor, and the air pressure is adjusted by controlling the movement of the motor and/or the opening and closing action of the mechanical exhaust valve.

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