WO2013189002A1 - Breast pump with gas path commutator structure - Google Patents

Description

 Breast pump with gas path commutator structure

 The invention relates to an electric breast pump, belonging to the field of maternal and child electrical appliances.

Background technique

 The electric breast pump mainly uses the simulation model of baby sucking breast milk, which uses negative pressure to apply to the human (female) breast, through the change of air pressure, that is, the "negative pressure" - "normal pressure" cyclic change, imitating the baby "one suck one "The action of sucking breast milk." In the prior art, the principle and structure of the reciprocating motion of the "piston or diaphragm-cylinder" is usually selected as the entity of the simulation model. The working principle is as follows: The micro-motor drives the piston assembly or the diaphragm to reciprocate in the cylinder and the pump base through a mechanical transmission mechanism, so that the gas in the cylinder realizes a negative pressure or restores a normal pressure. In order to prevent contamination of the gas in the pump seat from contact with the milk, some electric breast pumps have a gas-liquid separator between the vacuum pump and the three-way suction device.

 In practice, it is found that the shortcomings of such technical structure are: In reciprocating motion, the piston or diaphragm is used to move back and forth, and it is converted into suction and release action. When releasing, the force of returning to normal pressure is insufficient, especially the negative pressure. This problem is even more pronounced when a gas-liquid separator is placed between the pump and the three-way suction. In addition, reciprocating negative pressure pumps are more prone to mechanical wear due to inertia.

Summary of the invention

 SUMMARY OF THE INVENTION An object of the present invention is to overcome the deficiencies of the prior art and to provide a breast pump having a pneumatic commutator structure. Compared with the prior art breast pump, the force of returning to normal pressure upon release is large, and the vacuum pump is not easy to wear.

 In order to achieve the above object, the technical solution of the present invention is: the breast pump with a gas path commutator structure, comprising a negative pressure pump, a breast pump cover, a three-way suction device and a milk storage bottle; the difference is: A pneumatic circuit converter is also disposed between the pressure pump and the three-way suction device.

The port of the air circuit converter includes an airflow output/input port, an airflow output port, an airflow input port, a converter air inlet, and a converter air outlet; the air channel converter has a top space in the cavity Lower valve piece; the displacement of the upper and lower square sheets is electronically received Circuit control.

 In the inhalation state, the upper and lower blades move upward, the converter air inlet is closed, and the converter air outlet is opened; in the deflated state, the upper and lower valves move downward, and the converter air inlet opens. , the converter vent is closed.

 The negative pressure pump may be a micro diaphragm type vacuum pump, a rotary vane type vacuum pump or a oscillating piston type vacuum pump.

 A gas-liquid separator is further disposed between the gas path converter and the three-way suction device, and the gas-liquid separator is provided with an isolation cover.

 In the inhalation state, the upper and lower valve plates are controlled by the electronic circuit, displaced upward, the converter inlet is closed, and the converter air outlet is opened. When the negative pressure pump works, the airflow enters the port of the air circuit converter along the air pipe between the air circuit converter and the gas-liquid separator, flows through the cavity of the air circuit converter, and then enters the pump air inlet along the air pipe. , out of the pump outlet, along the trachea into the gas circuit converter, through the converter outlet to the outside of the machine to form a negative pressure circuit. Under the influence of negative pressure, the isolation cover in the gas-liquid separator is lifted up, so that the suction cap forms a negative pressure, thereby completing the sucking action.

 In the deflated state, the upper and lower valve plates are controlled by the electronic circuit, displaced downward, the converter inlet is opened, and the converter air outlet is closed. The negative pressure pump continues to work, and the airflow outside the machine enters the cavity of the air circuit converter from the air inlet of the air circuit converter, then enters the air inlet of the pump along the air pipe, flows out of the air outlet of the pump, and enters the air path along the air pipe. The converter, through the port of the converter, enters the gas-liquid separator along the gas pipe between the gas circuit converter and the gas-liquid separator to form a positive gas pressure circuit. Under the influence of positive air pressure, the isolation cover in the gas-liquid separator is displaced downward, so that the suction cap forms a positive pressure, thereby completing the release action.

The above analysis can be seen: 1. When the negative pressure pump is working, the airflow direction always enters from the pump inlet and flows out from the pump outlet. Overcoming the defect that the reciprocating negative pressure pump is more prone to mechanical wear; 2. When forming a negative pressure air flow or a positive pressure air flow, one port of the pneumatic circuit converter is always in communication with the external space, thus sucking and releasing The action is relatively strong; 3. Although the negative pressure or positive pressure airflow is connected to the outside of the atmosphere, due to the gas circuit converter and the third A gas-liquid separator is arranged between the suction devices, and the air flow is completely isolated from the breast milk, thereby ensuring that the breast milk is not polluted by the air.

DRAWINGS

 Figure 1 is a schematic view of the breast pump of the present invention in an inhaled state;

 Figure 2 is a schematic illustration of the breast pump of the present invention in a deflated state.

 The meaning of each reference mark: 1-absorbent cover, 2-storage bottle, 3-negative pressure pump, 4-air circuit converter, 5-gas liquid separator, 6-way three-way suction, 7-port one, 8 - Port 2, 9-port 3, 10-pump inlet, 11-pump outlet, 12-isolation cover, 13-trache one, 14-trache two, 15-trache three, 16-check valve, 17 - Converter air inlet, 18-converter air outlet, 19- upper valve, 20-low valve.

detailed description

 The present invention will be described in detail below with reference to the accompanying drawings:

 Referring to the drawings, a breast pump with a gas path commutator structure according to the present invention comprises a negative pressure pump 3, a breast pump 1, a three-way suction device 6 and a milk storage bottle 2; A pneumatic circuit converter 4 is also disposed between the negative pressure pump 3 and the three-way suction device 6.

 The port of the air circuit converter 4 includes an airflow output/input port 7, an airflow output port 8, an airflow input port 9, a converter air inlet 17, a converter air outlet 18; and the air circuit converter 4 is empty. The upper valve piece 19 and the lower valve piece 20 are disposed in the cavity; the displacement of the upper valve piece 19 and the lower valve piece 20 is controlled by an electronic circuit.

 In the inhaled state, the upper valve plate 19 and the lower valve plate 20 are moved upward, the converter air inlet 17 is closed, and the converter air outlet 18 is opened; in the deflated state, the upper wide plate 19 and the lower valve plate 20 are moved downward, The converter air inlet 17 is opened and the converter air outlet 18 is closed.

 The negative pressure pump 3 may be a micro diaphragm type vacuum pump, a rotary vane type vacuum pump or a swing piston type vacuum pump.

A gas-liquid separator 5 is further disposed between the gas path converter 4 and the three-way suction device 6, and the gas-liquid separator 5 is provided with a partition cover 12.

Claims

a breast pump with a gas path commutator structure, comprising a negative pressure pump (3), a breast suction cover (1), a three-way suction device (6) and a milk storage bottle (2); characterized in that: A gas path converter (4) is further disposed between the pump (3) and the three-way suction device (6); the gas path converter The port of (4) includes an airflow output/input port (7), an airflow output port (8), an airflow input port (9), a converter air inlet (17), and a converter air outlet (18); An upper valve piece (19) and a lower valve piece (20) are disposed in the cavity of the road converter (4); the displacement of the upper valve piece (19) and the lower valve piece (20) is controlled by an electronic circuit. A breast pump with a pneumatic commutator structure according to claim 1, wherein: in the inhaled state, the upper valve plate (19) and the lower valve plate (20) move upward, and the converter enters The air port (17) is closed, the converter air outlet (18) is opened; in the deflated state, the upper valve plate (19) and the lower valve plate (20) are moved downward, and the converter air inlet (17) is opened, the converter The vent (18) is closed. A breast pump with a pneumatic commutator structure according to claim 2, wherein: said negative pressure pump (3) is a micro diaphragm type vacuum pump. A breast pump with a pneumatic commutator structure according to claim 2, wherein: said negative pressure pump (3) employs a rotary vane type vacuum pump. A breast pump with a pneumatic commutator structure according to claim 2, wherein: said negative pressure pump (3) employs a oscillating piston type vacuum pump. A portable breast pump of any vertical structure according to any one of claims 1 to 5, characterized in that: the gas path converter (4) and the three-way suction device (6) are further provided with gas The liquid separator (5) is provided with a partition cover (12).