A breast pump drive

Abstract

A kind of breast pump driving device, the open shell of one end is installed through support step motor, the output shaft of step is screw rod and is connected piston through screw rod nut, the other end of shell is equipped with air pipe joint and check valve to form different air pressure with shell chamber, support is also equipped with silencing airway, to reduce working noise.This kind of breast pump driving device uses step motor and screw rod nut pair to drive piston to move to change air pressure, its action is accurate, suction is stable, basically does not exist flow attenuation phenomenon, can form accurate suction, and improve use comfort;At the same time, the working stability of breast pump driving device is good, the requirement of air tightness is lower, can reduce failure rate and improve use convenience;Furthermore, the working noise of breast pump is very low, can reduce the influence of working noise on newborn mother, improve its use comfort.

Description

TECHNICAL FIELD

[0001] The present application relates to a breast pump, in particular to a driving device in a breast pump. BACKGROUND

[0002] A breast pump is a tool for expressing breast milk in mammary glands, which is divided into manual and electric types. A gas pump for controlling air pressure is an important component in an electric breast pump. The existing gas pump is generally a direct current motor type diaphragm pump and a reduction direct current motor type piston pump. The former squeezes and pulls a diaphragm through rotation of a direct current motor to drive gas flow to form negative pressure in a closed space connected with an air inlet. The latter drives a screw to move through forward and reverse rotation of a direct current motor to form a reciprocating air cylinder. The gas flow of the direct current motor type diaphragm pump is small, and there is obvious flow decay phenomenon in the process of increasing negative pressure, which is difficult to meet the use needs of larger and more accurate suction, and the working stability is poor, which cannot guarantee stable suction and working accuracy, and easily brings uncomfortable use experience to the user. The structure of the reduction direct current motor type piston pump is relatively complex, and the failure rate is high. The air tightness of each part of the breast pump is also extremely high during use. For example, if the breast cup cover is slightly deviated from the breast when used by the operator, a program failure will be caused, resulting in that the breast pump cannot work. In addition, the motor of the existing breast pump gas pump is connected with the cylinder piston through a gear set and a speed changer, and the rotation angle of the motor is detected through a grating. The working accuracy is low, the noise is large, and the negative pressure is not balanced, which easily affects the motor speed. The service life of the carbon brush of the high-speed direct current motor is low, and the carbon brush is easily ignited to cause failure. SUMMARY

[0003] The purpose of the present application is to provide a breast pump driving device with simple structure and accurate and stable working, so as to improve the accuracy and comfort of the breast pumping operation.

[0004] The breast pump driving device provided by the present application comprises a cylindrical shell with an open end, a motor is installed on the open end of the shell through a support, and a motor cover covering the stepping motor is also installed on the shell; the motor is a stepping motor, the output shaft of the stepping motor is a lead screw, and a piston moving along the inner wall of the shell is screwed with the lead screw through a lead screw nut; an air pipe joint is arranged at the end of the shell away from the stepping motor, and the air pipe joint is provided with a communication hole communicating with the inside of the shell.

[0005] Further, an exhaust hole is arranged at the end of the shell away from the stepping motor, and a one-way valve is arranged at the exhaust hole to allow only gas to be discharged outward; a limit switch is installed in the shell, the stepping motor is started and drives the piston to move to a set position, and the control system starts to work after the limit switch detects that the piston is in place.

[0006] Further, the one-way valve comprises a flexible valve film and a pressing plate for fixing the valve film to the casing, the valve film is annular and has a sealing part in the middle for closing the exhaust hole of the casing, the pressing plate is pressed against the annular edge of the valve film, the film hole is arranged between the edge and the sealing part of the valve film, and the pressing plate has a pressing plate hole for connecting the two sides of the pressing plate.

[0007] Further, the piston comprises a piston rod and a piston head, the end of the piston rod is provided with a piston hole for the screw rod, and the screw nut is fixedly arranged at the piston hole.

[0008] Further, the side wall of the piston head is provided with an annular positioning groove recessed inwardly, and a sealing ring is arranged in the positioning groove and abuts against the inner wall of the casing to seal.

[0009] Further, the bracket is sleeved on the piston rod, and the positioning groove and the positioning convex rib are arranged in the bracket and the outer wall of the piston rod, respectively, and are arranged parallel to the axial direction of the casing.

[0010] Further, the end of the bracket is sealingly connected to the open end of the casing, the end of the bracket is provided with a sound attenuation air channel for reducing the sound, and the side of the end of the bracket is provided with an air channel inlet and an air channel outlet connected to the sound attenuation air channel.

[0011] Further, the sound attenuation air channel comprises a plurality of sound attenuation chambers connected in sequence, and the last sound attenuation chamber is connected to the air channel outlet, each sound attenuation chamber is provided with a sound attenuation hole in the chamber wall facing the air channel inlet, and all the sound attenuation holes are arranged on the outer side of the sound attenuation chamber.

[0012] Further, the chamber wall facing and away from the air channel inlet is in the shape of "<", the upper and lower ends of the "<" shape of the chamber wall are connected to the inner and outer walls of the sound attenuation chamber, respectively, the sound attenuation hole is arranged in the upper part of the "<" shape of the chamber wall, and the sound attenuation plate extending to the inner wall of the sound attenuation chamber is arranged at the midpoint of the "<" shape of the chamber wall away from the air channel inlet, a gap is left between the sound attenuation plate and the inner wall of the sound attenuation chamber, and the width of the gap is not greater than one tenth of the width of the sound attenuation chamber.

[0013] Further, the air channel outlet is arranged at the position adjacent to the outer wall at the bottom of the last sound attenuation chamber, and the "<" shape of the chamber wall facing the air channel inlet is provided with a partition plate extending to the other chamber wall at the lower end of the "<" shape.

[0014] The breast pump driving device has a hollow shell, a piston is sealedly connected with the inner wall of the shell through a sealing ring and moves along the inner wall of the shell under the driving of a motor, so as to change the volume of the chamber and form the air suction and exhaust effects; the motor is a stepping motor which connects the piston through a screw nut pair, so that the piston can accurately control the stroke to change the volume of the chamber and form a specific suction force; a gas pipe joint on the shell is connected with a breast pump through a gas pipe, and the cover opening of the breast pump is in close contact with the breast to form a seal; when the piston moves to the end of the stepping motor under the driving of the stepping motor, the mutually connected shell cavity, gas pipe and breast pump form a negative pressure, so as to form a suction force and suck the breast milk; when the piston moves away from the stepping motor under the driving of the stepping motor, the negative pressure in the shell decreases until it is equal to the atmospheric pressure, so that the shell and the breast pump return to the pressure balance to wait for the next breast pumping action. On the other hand, the main noise sources of the breast pump driving device are the screw nut pair, the piston and the airflow in the shell, so the end of the bracket is sealedly arranged in the shell, so as to cover these main noise sources in the chamber, which can effectively reduce the working noise of the breast pump; at the same time, a sound attenuation air duct is arranged on the bracket, so that the sound wave and the airflow pass through the sound attenuation air duct to reduce the noise before being discharged out of the shell from the air duct outlet, so as to further reduce the noise volume. The breast pump driving device has the following beneficial effects: the breast pump driving device uses the stepping motor and the screw nut pair to drive the piston to move to change the air pressure, the action is accurate, the suction force is stable, there is basically no flow decay phenomenon, an accurate suction force can be formed, and the use comfort is improved; at the same time, the working stability of the breast pump driving device is good, the requirement for air tightness is low, the failure rate can be reduced, and the use convenience is improved; in addition, the working noise of the breast pump is very low, the influence of the working noise on the newborn mother can be reduced, and the use comfort is improved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structure schematic diagram of the breast pump driving device.

[0016] Figure 2 is a sectional structure schematic diagram of the breast pump driving device.

[0017] Figure 3 is Figure 2 a local structure schematic diagram of the breast pump driving device shown in

[0018] Figure 4 is a connection structure schematic diagram of the bracket and the piston.

[0019] Figure 5 、 6 is a structure schematic diagram of the bracket and the sound attenuation air duct thereon.

[0020] Figure 7 is Figure 6 a local structure schematic diagram of the sound attenuation air duct shown in

[0021] Figure 8 is a top view structural schematic diagram of the sound-attenuating airway. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0023] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, top, bottom, inner, outer, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0024] If the embodiments of the present application involve descriptions of “first” or “second”, etc., the descriptions of “first” or “second”, etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first” and “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize the combination, and when the combination of technical solutions contradicts each other or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the protection scope of the present application.

[0025] The present application provides a breast pump driving device.

[0026] In the embodiments of the present application, the breast pump driving device comprises a cylindrical shell 1 with an open end, a stepping motor 3 is installed on the open end of the shell through a support 2, and a shell cover 4 covering the stepping motor is further installed on the shell; the output rotating shaft of the stepping motor is a lead screw 5, a piston moving along the inner wall of the shell is screwed with the lead screw through a lead screw nut 7; a gas pipe joint 11 is arranged at the end of the shell away from the stepping motor, and the gas pipe joint is provided with a communication hole communicating with the inside of the shell.

[0027] The driving device of the breast pump is hollow in the casing, the piston is sealed and connected with the inner wall of the casing through a sealing ring, and is moved along the inner wall of the casing under the driving of the motor, so as to change the volume of the chamber and form the suction and exhaust effects; the motor is a stepping motor, which connects the piston through a screw nut pair, so that the piston can accurately control the stroke to change the volume of the chamber and form a specific suction force; the gas pipe joint on the casing is connected with the breast pump bottle through a gas pipe, and the cover opening of the breast pump bottle is attached to the breast to form a seal; when the piston is moved to the end of the stepping motor under the driving of the stepping motor, the mutually connected inner cavity of the casing, the gas pipe and the breast pump bottle will form a negative pressure, so as to form a suction force and suck the breast milk; when the piston is moved away from the stepping motor under the driving of the stepping motor, the inner cavity of the casing will form a positive pressure, and then the gas will be discharged out of the casing through the one-way valve with the movement of the piston, so that the casing and the breast pump bottle restore the air pressure balance to wait for the next breast pumping action.

[0028] The driving device of the breast pump is hollow in the casing, the piston is sealed and connected with the inner wall of the casing through a sealing ring, and is moved along the inner wall of the casing under the driving of the motor, so as to change the volume of the chamber and form the suction and exhaust effects; the motor is a stepping motor, which connects the piston through a screw nut pair, so that the piston can accurately control the stroke to change the volume of the chamber and form a specific suction force; the gas pipe joint on the casing is connected with the breast pump bottle through a gas pipe, and the cover opening of the breast pump bottle is attached to the breast to form a seal; when the piston is moved to the end of the stepping motor under the driving of the stepping motor, the mutually connected inner cavity of the casing, the gas pipe and the breast pump bottle will form a negative pressure, so as to form a suction force and suck the breast milk; when the piston is moved away from the stepping motor under the driving of the stepping motor, the inner cavity of the casing will form a positive pressure, and then the gas will be discharged out of the casing through the one-way valve with the movement of the piston, so that the casing and the breast pump bottle restore the air pressure balance to wait for the next breast pumping action. The one-way valve includes a flexible valve film 81 and a pressing plate 82 for fixing the valve film on the casing 1, the valve film is annular and has a sealing part 83 in the middle for closing the exhaust hole of the casing, the pressing plate is pressed against the annular edge of the valve film, the valve film has a film hole 84 between the edge and the sealing part, and the pressing plate has a pressing plate hole 85 for connecting the two sides of the inside; when the piston moves towards the stepping motor, the inner cavity of the casing forms a negative pressure and generates a suction force, the valve film is pressed against the exhaust hole of the casing through the sealing part under the action of the suction force, so as to form a seal for the exhaust hole; when the piston moves away from the stepping motor, the inner cavity of the casing forms a positive pressure, and the air in the cavity needs to be discharged outward, the valve film is deformed under the action of the air thrust, the sealing part is pushed away from the exhaust hole, and the gas hole in the casing is discharged outward through the exhaust hole, the film hole and the pressing plate hole, so that the casing and the breast pump bottle restore the air pressure balance; the one-way valve has a simple structure but a very fast response speed to the change of the air pressure, which can improve the working accuracy of the breast pump.

[0029] The breast pump drive device comprises a piston comprising a piston rod 61 and a piston head 62. The end of the piston rod is provided with a piston hole 63 for the screw 5 to extend into. A screw nut 7 is secured to the piston hole by a set screw 64. This ensures a tight seal between the piston and the housing while also making the connection between components more compact and reducing the size of the device. The sidewall of the piston head 62 is provided with an inwardly recessed annular positioning groove 65. A sealing ring 66 is mounted within the positioning groove. The sealing ring abuts against the inner wall of the housing 1, forming an interference fit and enhancing the sealing performance. Furthermore, a bracket 2 is positioned over the piston rod 61. A cooperating positioning groove 21 and a positioning rib 67 are provided between the inner side of the bracket and the outer wall of the piston rod. These positioning grooves and ribs are arranged parallel to the axial direction of the housing, thereby limiting and guiding the piston rod, improving its operational stability and accuracy, and preventing erroneous rotation of the piston rod caused by the stepper motor.

[0030] In the breast pump drive device, the end of the bracket 2 is sealedly connected to the open end of the casing 1, and a sound-reducing air duct is provided in the end of the bracket. The sides of the bracket end facing toward and away from the piston are respectively provided with an air duct inlet 22 and an air duct outlet 23 connected to the sound-reducing air duct. The noise-generating parts of this breast pump drive device are mainly the screw-nut pair, the piston and the airflow in the casing. To this end, the end of the bracket is sealed with the casing, thereby enclosing these main noise-generating components in the chamber, which can effectively reduce the operating noise of the breast pump. At the same time, a sound-reducing air duct is provided on the bracket, so that sound waves and airflow are discharged from the casing through the air duct outlet after being reduced in noise by the sound-reducing air duct, thereby further reducing the noise volume. The silencing air duct includes several silencing chambers 24 connected in sequence, and the last silencing chamber is connected to the air duct outlet 23. A silencing hole 25 is opened on the chamber wall of each silencing chamber facing the air duct inlet 22. All silencing holes are arranged toward the outside of the silencing chamber (or toward the inside of the silencing chamber), that is, toward the side wall of the silencing chamber facing away from the screw rod. This allows the sound waves entering from the silencing holes to be emitted toward the outer wall of the silencing chamber. On the one hand, the sound waves can pass through the entire silencing chamber before entering the next silencing chamber. On the other hand, the sound waves reflected by the outer wall of the silencing chamber will interfere with the subsequent sound waves, thereby weakening the sound waves to a certain extent. Therefore, the process of the sound waves passing through all the silencing chambers and then being discharged from the air duct outlet can form a great degree of weakening, thereby reducing noise. Specifically, the silencing air duct can be as follows Figures 5-8As shown, the chamber wall of the sound attenuation chamber 24 towards and away from the airway inlet 22 is in the shape of "<", the upper and lower ends of the chamber wall in the shape of "<" are connected to the inner and outer side walls of the sound attenuation chamber respectively, the sound attenuation holes are arranged at the upper part of the chamber wall in the shape of "<", and the sound attenuation plate 26 extending to the inner side wall of the sound attenuation chamber is arranged at the midpoint of the chamber wall in the shape of "<" away from the airway inlet, a gap is left between the sound attenuation plate and the inner side wall of the sound attenuation chamber, and the width of the gap is not greater than one tenth of the width of the sound attenuation chamber, which can further divide the sound attenuation chamber into a large chamber and a small chamber, the outer side width of the large chamber is greater than the inner side width, and the sound waves are directed and shot to the outer side and then reflected to the inner side, so that the sound waves can form multiple reflections and transmissions, thereby weakening the sound waves multiple times, and the weakened sound waves enter the small chamber through the gap at the sound attenuation plate and then are shot to the next sound attenuation chamber, thereby forming a multi-stage sound attenuation structure, greatly reducing the volume of noise; in addition, the airway outlet 23 is arranged at the bottom of the terminal sound attenuation chamber 24 adjacent to the outer side wall, and the lower end of the chamber wall of the sound attenuation chamber towards the airway inlet 22 is provided with the partition plate 27 extending to the other chamber wall, which also can further reduce the volume of noise. Through the arrangement of the sound attenuation airway structure, the working noise of the breast pump can be effectively reduced, thereby improving the use comfort.

[0031] The above description is only the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made under the inventive concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A breast pump drive device, comprising a cylindrical housing (1) with an open end, a motor mounted on the open end of the housing via a bracket (2), and a cover (4) covering the stepper motor mounted on the housing, characterized in that: The motor is a stepper motor (3), the output shaft of the stepper motor is a screw (5), the piston moving along the inner wall of the housing is screwed to the screw via a screw nut (7), and the piston is sealed to the inner wall of the housing via a sealing ring (66); an end of the housing facing away from the stepper motor is provided with an air pipe joint (11) connected to a sucking bottle via an air pipe, and the air pipe joint is provided with a connecting hole connected to the housing; an end of the housing facing away from the stepper motor is also provided with an exhaust hole, and a one-way valve is provided at the exhaust hole for only allowing gas to be discharged outward; the bracket is installed in the housing, and the end of the bracket is sealed to the open end of the housing (1), and a sound-reducing air duct is provided in the end of the bracket, and an air duct inlet (22) and an air duct outlet (23) connected to the sound-reducing air duct are provided on the sides of the end of the bracket facing toward and away from the piston, respectively.

2. The breast pump drive device according to claim 1, characterized in that: The silencer airway comprises a plurality of silencer chambers (24) connected in sequence, and the last silencer chamber is connected to the airway outlet (23). A silencer hole (25) is opened on the chamber wall of each silencer chamber facing the airway inlet (22), and all the silencer holes are arranged toward the outside of the silencer chamber.

3. The breast pump drive device according to claim 2, characterized in that: The chamber walls of the silencer chamber (24) facing toward and facing away from the airway inlet (22) are in the shape of a "<" character, the upper and lower ends of the "<" character of the chamber wall are respectively connected to the inner and outer walls of the silencer chamber, and the silencer hole is provided in the upper part of the "<" character of the chamber wall.

4. The breast pump drive device according to claim 3, characterized in that: A silencer plate (26) extending toward the inner wall of the silencer chamber is provided at the midpoint of the "<" shape of the silencer chamber wall facing away from the airway inlet, and a gap is left between the silencer plate and the inner wall of the silencer chamber, with the width of the gap being no greater than one tenth of the width of the silencer chamber.

5. The breast pump drive device according to claim 3 or 4, characterized in that: The airway outlet (23) is arranged at the bottom of the terminal silencer chamber (24) and adjacent to the outer wall. A partition (27) extending toward the other chamber wall is provided at the lower end of the "<"-shaped chamber wall of the silencer chamber facing the airway inlet (22).

6. The breast pump drive device according to claim 1, wherein: A limit switch (9) is installed in the housing (1), and the stepper motor (3) is started and drives the piston to move to a set position. The control system starts working after the limit switch detects that the piston is in place.

7. The breast pump drive device according to claim 6, characterized in that: The one-way valve comprises a flexible valve membrane (81) and a pressure plate (82) for fixing the valve membrane to the housing (1). The valve membrane is annular and has a sealing portion (83) in the middle thereof for closing the exhaust hole of the housing. The pressure plate is pressed against the annular edge of the valve membrane. The valve membrane is provided with a membrane hole (84) between the edge and the sealing portion. The pressure plate is provided with a pressure plate hole (85) communicating with both sides of the inner side.

8. The breast pump drive device according to any one of claims 1-4 and 6-7, characterized in that: The piston comprises a piston rod (61) and a piston head (62). The end of the piston rod is provided with a piston hole (63) for the screw rod (5) to extend into, and the screw rod nut (7) is fixedly installed at the piston hole.

9. The breast pump drive device according to claim 8, characterized in that: An inwardly recessed annular positioning groove (65) is provided on the side wall of the piston head (62), a sealing ring (66) is installed in the positioning groove, and the sealing ring is sealed against the inner wall of the housing (1).

10. The breast pump drive device according to claim 8, characterized in that: The bracket (2) is sleeved on the piston rod (61), and a positioning groove (21) and a positioning rib (67) that cooperate with each other are provided between the inner side of the bracket and the outer wall of the piston rod, and the positioning groove and the positioning rib are arranged parallel to the axial direction of the casing.

Images