CN103110989A - Structure-compact-type reciprocating aspirator and breast pump - Google Patents

Abstract

The invention discloses a reciprocating suction device and a breast pump with a compact structure, which are applied to the field requiring small displacement suction vacuum, which uses a power motor unit for providing the original rotational torque and a power motor unit for converting the power into The cylinder driving unit whose internal volume is deformed to output suction is arranged in parallel on the same side of the gear transmission unit used for decelerating and reversing the original torque and is connected with it, and is designed by integrating the gear transmission unit with the synchronous belt transmission mechanism In the same gear box, while realizing the functions of large suction and high efficiency; compared with the existing technology of the same level, the volume can be reduced by half, and the purpose of portability is realized; the structure is firm and reliable, and multiple shock absorption and noise reduction designs are applied to achieve a quiet effect.

Description

A compact reciprocating suction device and breast pump

the

technical field

The invention relates to a reciprocating suction device with a compact structure and a breast pump, in particular to an electric suction device with a compact structure which generates suction through the reciprocating motion of a cylinder piston and a breast pump using the suction device.

the

Background technique

The reciprocating electric suction device (cylinder type electric suction device) is widely used in medical, health care, beauty and other fields that need to generate a small displacement vacuum; for example, the cylinder type breast pump, which uses the reciprocating electric suction device The generated suction collects the breast milk accumulated in the mammary gland to feed the baby, and the characteristics of the intermittent suction effect due to the reciprocating motion of the cylinder piston of the reciprocating electric suction device can be used to simulate the periodicity of the baby sucking breast milk. The suction and discharge effect improves the collection efficiency and the comfort of use. As early as 1854, the United States Patent Office granted O.H. Needham a manual breast pump patent (patent number 11135). It has been seen that the basic elements of a breast pump include: a bellows capable of generating vacuum, a funnel-shaped breast shield and a trachea. In 1921, Edward Lasker invented a breast pump capable of simulating a baby’s sucking. Its U.S. patent number is 1644257, which is recognized as a practical improvement and application of an electric breast pump. Its technical solution includes a breast shield integrally connected with a feeding bottle and milk. Isolated check valve, cylinder type design. In 1956, Eubar Egnell designed the famous Egnell SMB electric breast pump. Although this breast pump is huge in size, a small amount is still in use today.

The types of breast pumps are mainly divided into plastic bowl type, vacuum pump type and air cylinder type according to the suction principle. The plastic bowl type is mainly used for the manual type. The plastic bowl is deformed by hand pinching or pulling by a lever to generate a vacuum. The suction is small and the breast pumping effect is unreliable. The vacuum pump type is used in electric breast pumps. Its small size is the main advantage, but the suction volume is small, and it depends on the accumulation of vacuum to achieve suction, so the efficiency is low and the suction comfort is not good. The cylinder type breast pump has large suction volume, high suction force, high efficiency, and good comfort, but the realization structure is complicated. The cylinder-type electric suction device inside is often bulky and inconvenient to carry, and mothers often go out or work when pumping milk, so the breast pump must truly meet the requirements of breastfeeding mothers. It is ideal for large suction, high efficiency and small size. Since the development of breast pump technology, the basic elements have been finalized. The more challenge is how to achieve the smallest volume while giving greater suction and efficiency. A further challenge is to achieve low noise, no interference, and a reliable service life. .

the

Contents of the invention

The main technical problem to be solved by the present invention is to provide a reciprocating suction device and a breast pump with a compact structure, which reduces the volume of the product on the premise of providing large suction and maintaining high efficiency.

In order to solve the above technical problems, the present invention provides a reciprocating suction device with a compact structure, which includes a power supply, a casing, and a power motor unit provided in the casing for providing the original rotational torque, for connecting the The gear transmission unit for decelerating and reversing the rotation output of the power motor unit, the cylinder drive unit for connecting the power output of the gear transmission unit into its own internal volume deformation to output suction, and the control circuit board for function control . The power motor unit and the cylinder drive unit are arranged side by side in parallel to the axis, and are connected to the same side of the gear transmission unit. The gear transmission unit has a reversing function, and the gear transmission unit is integrally provided with a reduction mechanism With synchronous belt drive mechanism. The design is compact in connection, saves space, can reduce the volume by half compared with the existing technology of the same level of function, has a firm and reliable structure, can transmit high power, and is conducive to shock absorption and noise reduction.

During implementation, according to the solution of the present invention, the power motor unit directly drives the cylinder drive unit through a gear box without a belt mechanism for deceleration, and there is a transmission reversing mechanism in the gear box, so that the power motor unit and the cylinder drive unit are arranged side by side It is arranged in parallel with the axes, thereby greatly reducing the width of the host.

The control circuit board controls the periodic forward and reverse output of the power motor unit, so as to realize the periodic air intake and exhaust of the cylinder drive unit, wherein the control circuit board controls the stroke and speed of forward/reverse rotation of the power motor unit. Determines the strength and speed of the cylinder drive unit suction.

During implementation, the gear transmission unit includes a gear box for realizing the deceleration and reversing, a synchronous belt transmission mechanism used as the power output end of the gear transmission unit, and is connected integrally with the gear box for connection Position the synchronous belt bracket of the synchronous belt transmission mechanism; the synchronous belt transmission mechanism includes a synchronous toothed belt and an active synchronous belt pulley and a driven synchronous belt pulley matched by the synchronous toothed belt, and the active synchronous belt pulley is connected to The power output end of the gearbox. This structure effectively realizes the deceleration and reversing of the output power of the power motor unit, and ensures a compact structure while realizing high power transmission. The application of the synchronous belt transmission mechanism provides a buffer transition in the transmission path, ensuring effective transmission At the same time, the reliability of the transmission structure is improved, and the buffering of vibration, noise and rigid transmission is realized.

During implementation, the gearbox includes a helical spur gear, a first double gear, a second double gear and a bevel gear that are meshed in sequence, wherein the helical spur gear, the first double gear, and the second double gear have axes parallel to each other. It is set and has a deceleration matching structure. The bevel gear is arranged perpendicular to the axis of the second double gear and realizes transmission reversing through bevel gear cooperation. The gearbox also includes a power output shaft used as the power output end; the bevel gear is fixed at one end of the power output shaft.

The power output of the active synchronous pulley connected to the gearbox means that the active synchronous pulley of the synchronous belt transmission mechanism is also fixed on the power output shaft. The application of helical cylindrical gears has the advantages of large coincidence coefficient between gears, stable transmission, high gear strength, and heavy load bearing. Because the input end (helical cylindrical gears) needs frequent reversing, it can significantly reduce vibration and noise. . The application of the bevel gear and the connection with the synchronous pulley ensure a compact structure while realizing the reversing.

During implementation, the first dual gear and the second dual gear are respectively limited in the gearbox by the first gear shaft and the second gear shaft; the first gear shaft is close to one end of the helical spur gear A soft washer is provided, and an elastic washer, a steel washer and a soft washer are arranged sequentially from the outside to the inside of the end of the first gear shaft far away from the helical gear; the elastic washer acts as a buffer and fills the left and right sides of the gap, and the steel washer tightly The elastic washer constitutes the support surface, and the soft washer contacts with the gear to resist wear and reduce friction.

The end of the second gear shaft far away from the bevel gear is provided with an end face sliding bearing that is in close contact with the end face of the gear, and the end face sliding bearing is concentrically sleeved on the second gear shaft and fits on the inner box side wall of the gear box On the outer side of the gearbox, there is a radial reinforcing rib plate structure corresponding to the installation position of the end face sliding bearing. The end face sliding bearing reduces friction and improves reliability, and the ribbed plate enhances the structural strength and reduces vibration.

During implementation, the gear box includes a gear box housing. The gearbox housing and the synchronous belt support are integrally structured to save space. The integral structure is formed by combining a first half-shell and a second half-shell. The first half-shell and the second half-shell The body is a split structure along the vertical plane where the axis of the power output shaft is located. The spliced structure of the gearbox housing facilitates the assembly of gears and various transmission components, and ensures the connection stability of the spliced surfaces.

During implementation, the motor body is a plane near the output end, and there is a circular boss on the plane; the gear box is provided with a motor connection end surface adapted to the plane of the motor, and a motor connection end surface is provided on the motor connection end surface. A circular hole adapted to the circular boss. The circular boss on the output end side of the motor is inserted into the center of the circular hole for positioning, and the plane of the motor is positioned axially against the motor connection end face of the gearbox. This structure improves the stability of the connection, reduces assembly errors, and avoids problems such as transmission failure, gear wear, collision and vibration noise caused by assembly errors; and the motor is directly fixed on the gearbox to avoid contact with the housing and other components. Direct contact effectively reduces the transmission path of motor vibration.

During implementation, the cylinder drive unit includes a cylinder, a piston rod inserted into the open end of the cylinder and having a T-shaped cross-section along the insertion direction, and a piston rod sleeved on the piston rod and matched with the inner wall of the cylinder. The piston ring; the closed end of the cylinder is also provided with a suction port that penetrates the side wall of the housing and is used for suction/exhaust output of the suction; the outer end of the piston rod is fixedly connected to the On the timing belt, the maximum stroke of the piston rod driven by the timing belt is equal to the maximum stroke of the piston rod in the cylinder. Its structure is simple and reliable, and it is convenient to use large-diameter and long-stroke cylinders.

During implementation, the piston rod is connected below the straight line section of the synchronous toothed belt, a U-shaped guide groove is provided at the lower part of the piston rod, and an upper end surface and the The U-shaped guide groove cooperates with a pulley for guiding and supporting the piston rod. The structure is simple and reliable. The combination of the U-shaped guide groove and the pulley forms a support and guide for the piston rod, which improves product reliability and reduces yaw vibration and noise.

An axial depression parallel to the contour surface of the piston ring is also provided on the large end surface of the piston rod to ensure uniform thickness of the piston rod structure and reduce molding difficulty and production cost.

During implementation, the cylinder body is further provided with a flexible gasket for vibration damping at the gap between the open end side and the gear transmission unit. Avoid rigid collisions, and fill gaps to enhance structural strength.

The center line of the closed end of the cylinder is also provided with a screw positioning plate for positioning the cylinder relative to the gear transmission unit, and a through hole is provided in the middle of the screw positioning plate. The setting position of the screw positioning plate effectively positions the cylinder axially, avoids the cylinder following movement during the pushing and pulling of the piston rod, ensures reliable positioning, and reduces vibration and noise.

A bypass port perpendicular to its axis is provided on the side wall of the cylinder near its closed end, and the cylinder drive unit also includes an overpressure valve connected to the bypass port through an air pipe. The setting of the overpressure valve enables the product to have the function of overpressure protection, which improves the safety of the product; the sideways setting of the bypass port reduces the overall volume of the product.

During implementation, the overpressure valve includes a valve body, a valve cover and a valve plate, wherein the valve body has an internal exhaust channel, the exhaust channel has an air inlet and an exhaust port, and the air inlet The bypass interface of the cylinder is connected with the air pipe; the valve plate is made of elastic material, and its inner surface sticks to the sealing surface of the valve body, and its upper part is positioned relative to the valve body, and a raised spherical surface is arranged in the middle, The spherical surface aligns with the exhaust hole of the valve body to form a sealing structure. The lower part of the valve plate is bent like a fishhook, and the bent part adopts a thickened structure; The cavity separated by the sealing surface, the tail end of the bent part of the valve plate is embedded in the cavity. The structure is reliable and well sealed, which can avoid the problem of easy failure of the existing overpressure valve and improve the service life of the product.

During implementation, the driven synchronous pulley includes a circular tubular synchronous belt gear; the synchronous belt gear includes an outer cylindrical tooth profile and an inner hole, wherein the inner hole has at least one concave oil groove along its radial direction; The moving synchronous pulley also includes a central shaft passing through the inner hole; the central shaft has a card slot at the positions corresponding to the outer sides of the two ends of the synchronous belt gear, and a lifting device is also clamped on the card slot. Circlips with limiting action. The structure of the driven synchronous belt pulley has a small overall volume, and the circular tube-shaped synchronous belt gear can rotate effectively for a long time under the condition of fixing the center shaft and no need for roller slips.

During implementation, the synchronous belt bracket is U-shaped when viewed from above, and its bottom end is a channel body with a through-hole structure. The through-hole of the channel body communicates with the opening of the U-shaped body, and the driven synchronous pulley Across the opening of the U-shaped body, the driving synchronous pulley is arranged in the channel body, and L-shaped installation grooves are arranged symmetrically on both wings at the opening of the U-shaped body where the driven synchronous pulley is arranged. The long groove of the L-shaped installation groove is parallel to the transmission direction of the timing belt, and the short groove of the L-shaped installation groove extends to the end face of the timing belt bracket; the piston rod penetrates the through hole of the channel body. The structure is simple and reliable, small in size, and has good structural strength. The L-shaped installation groove is convenient for the installation and adjustment of the driven synchronous pulley.

During implementation, the control circuit board is arranged above the cylinder drive unit, and a magnetic block is arranged on the upper end surface of the piston rod close to the piston ring and the inner wall of the cylinder, and the control circuit board is provided with a magnetic block for sensing the position of the magnetic block. Hall element to detect the position of the piston rod to achieve control calibration.

The square channel is also provided with an escape gap at the position corresponding to the movement track of the magnetic block on the gear box, so as to reduce the volume of the product and increase the stroke of the piston rod.

The control circuit board also includes a circuit for controlling the rotation direction, rotation speed, rotation stroke and forward/reverse conversion period of the rotation output of the motor unit. Achieve product control.

During implementation, the cylinder drive unit is provided with a return buffer spring for reducing return vibration. Avoid noise, vibration and affect the user experience caused by the vacuum suction in the cylinder driving the piston rod to return quickly during the return stroke of the piston rod, and can store the energy of the compressed spring during the return stroke to provide part of the power for the pumping process to reduce the power requirement of the motor .

Specifically, the buffer spring is a coil spring, and the end of the power output shaft protruding from the gear box has a flat groove gap, and the outer side of the gear box (synchronous belt bracket) is also on the side of the power output shaft. There is a hanging column; one end of the buffer spring is clamped on the notch of the flat groove, and the other end is clamped on the hanging column; the outer end of the hanging column is provided for blocking the buffer spring from disengaging steps.

In practice, the power motor unit includes a motor, a soft gasket and cooling blades, the motor includes a motor output shaft extending forward on the axis of its main body and an extension extending backward, the helical cylinder The gear and the soft washer are installed on the output shaft of the motor; wherein the soft washer is located between the helical gear and the main body of the motor, and the soft washer and the helical gear The end face of the motor is in close contact with the end face of the main body of the motor. This structure makes the output shaft of the motor fixed in the axial position, effectively coping with the axial force generated during the transmission process of the helical cylindrical gear, and the friction between the helical cylindrical gear and the main body of the motor is effectively reduced through the soft gasket to ensure the working efficiency of the motor.

During implementation, an auxiliary support bearing is installed at the outer end corresponding to the output shaft of the motor in the gear box, and a middle hole is also provided in the gear box to penetrate the gear box for cooperating with screws to secure the motor body The screw hole column locked on the gear box ensures the structural strength of the gear box.

The heat dissipation blades are fixed on the extension section, and the heat dissipation blades include at least two blade units in a radial radial structure, and every two blade units are arranged at intervals; the control circuit board includes a motor rotating A digital sensing circuit, the circuit includes an infrared sensor for sensing the distance between the blade units of the heat dissipation blades, the infrared sensor includes a U-shaped slot, and the rotation track of the heat dissipation blade passes through the U-shaped slot middle. The structure realizes the rotation speed inspection of the motor through the heat dissipation blades, and at the same time, the heat dissipation blades realize the cooling of the motor.

During implementation, the housing also includes an inner bracket, the power motor unit, the gear transmission unit and the cylinder drive unit are all connected to the inner bracket; the connection between the inner bracket and the housing is set There are flexible gaskets for isolation. The setting of the inner bracket strengthens the cooperation structure of the power motor unit, the gear transmission unit and the cylinder drive unit, making the product strong and durable, and reduces the vibration during the working process. The flexible gasket further buffers and prevents the transmission of vibration to the shell.

During implementation, the main plane of the inner bracket corresponds to the position of the power motor unit, the gear transmission unit and the cylinder drive unit, and is respectively recessed to be provided with a concave motor groove, a concave gear box groove and a concave cylinder groove, so that The power motor unit and the recessed motor slot are arranged to avoid space, and the gear transmission unit and the cylinder driving unit are respectively embedded in the recessed gear box slot and the recessed cylinder slot. This structure ensures that the connection of each unit is reliable and saves space. The air-avoiding structure prevents the vibration of the motor unit from being directly transmitted to the inner bracket, and at the same time facilitates the heat dissipation of the motor.

During implementation, the concave gear box groove further includes a flexible buffer sleeve adapted to the structure of the groove body, and the flexible buffer sleeve is isolated between the gear transmission unit and the concave gear box groove. This structure makes the vibration of the motor unit and the gear transmission unit absorbed by the buffer sleeve and not directly transmitted to the inner bracket, which is beneficial to reduce noise and vibration.

During implementation, ventilation holes are evenly distributed in the recessed motor groove, and cooling holes are provided on the housing corresponding to the position of the ventilation hole to improve the heat dissipation performance of the motor; both sides of the concave cylinder groove are also There is a narrow and long small surface, and four vertical columns are arranged on the small surface, and the control circuit board is installed on the four vertical columns. This structure saves space and is easy to assemble.

During implementation, the housing is composed of an upper housing and a lower housing, the inner bracket is connected to the lower housing, an operation interface is provided on the top surface of the upper housing, and a The display screen and the buttons arranged around the display screen; the outer contour of the housing is in the shape of a cuboid with chamfered edges, and one vertical side of the housing has a larger chamfering radius than the other edges; Raised anti-slip texture. This structure is convenient for assembly and use, and maintains a maximum match with the internal structure of the product, reduces the volume of the product, and is easy to carry.

The operation interface is circular, and the display screen is two LED display screens arranged side by side in the center of the area and used to display the suction and speed values respectively; the keys are elliptical and there are seven sets in total, including: setting The "on/pause" pause key on the upper part of the display screen, the memory key and the massage key on both sides of the display screen are respectively arranged below the corresponding LED display screen, and there are two speed increase/decrease keys arranged up and down , and two suction increase/decrease keys arranged up and down. This structure makes the user interface friendly, the operation easier and more convenient, and satisfies the user's convenient operation requirements to the greatest extent.

The present invention also provides a breast pump, which comprises the compact reciprocating suction device as described above.

During implementation, the breast pump also includes a trachea connected to the suction port and a breast shield.

The beneficial effects of the present invention are: a reciprocating suction device and a breast pump with a compact structure, driven by a power motor unit used to provide the original rotational torque and a cylinder used to convert power into internal volume deformation to output suction The unit is arranged on the same side of the gear transmission unit for decelerating and reversing the original torque and is connected to it, and the power motor unit is arranged side by side with the cylinder drive unit in parallel with the axis to achieve a relatively compact structure. On the premise of reducing suction and efficiency, the volume of the product is reduced, and the effects of shock absorption and noise reduction are improved.

Further, the gear transmission unit is composed of a gearbox and a synchronous belt transmission mechanism (integrated construction means that the gear reduction mechanism and the synchronous belt mechanism are installed in the same box), and the cylinder drive unit is driven by the synchronous belt transmission mechanism. At the same time of high power transmission, it ensures a compact structure. The application of the synchronous belt transmission mechanism provides a buffer transition in the transmission path, which ensures effective transmission and improves the reliability of the transmission structure, and realizes the protection against vibration, noise and rigid transmission. buffer.

Further, the motor outputs power to the gearbox through the helical cylindrical gear, the transmission is stable, and it can bear a large transmission load, reducing the vibration and noise problems caused by frequent reversing at the input end.

Furthermore, the setting of the inner bracket strengthens the structural strength, improves the stability of the cooperation of each unit, and reduces the vibration caused by deformation or loosening when the equipment is working.

Further, a flexible buffer sleeve is provided between the concave gear box groove and the gear transmission unit, a flexible gasket is provided at the connection between the inner bracket and the housing, and a flexible gasket is provided at the connection between the gear box body and the end face of the cylinder to form multiple isolation buffers, Reduce the overall vibration of the motor, gear transmission unit and each unit on the inner bracket, reduce noise interference, and improve product service life.

the

Description of drawings

Fig. 1 is the exploded structure schematic diagram of a kind of embodiment of compact reciprocating suction device of the present invention;

Fig. 2 is a schematic diagram of the internal structure of the embodiment shown in Fig. 1 after assembly;

Fig. 3 is a schematic diagram of the external structure of the embodiment shown in Fig. 1 after assembly;

Fig. 4 is a schematic diagram of a three-dimensional structure at another angle relative to Fig. 3;

Fig. 5 is a three-dimensional schematic diagram of the bottom structure relative to Fig. 3;

Fig. 6 is a schematic diagram of the operation panel of the embodiment shown in Fig. 1;

Fig. 7 is a schematic diagram of the partial structure of the inner bracket of the embodiment shown in Fig. 1;

Fig. 8 is a structural schematic view (partial cross-sectional view) of the embodiment shown in Fig. 1 after the housing and circuit board are removed, and other parts are assembled;

Fig. 9 is a schematic diagram of a three-dimensional structure at another angle relative to Fig. 8;

Fig. 10 is a schematic structural view of the transmission link part of the embodiment shown in Fig. 1 (partial cross-sectional view of the gear transmission unit);

Fig. 11 is an exploded view of the gear transmission unit and the power motor unit of the embodiment shown in Fig. 1;

Fig. 12 is a partial sectional structural schematic diagram of the cylinder drive unit of the embodiment shown in Fig. 1 (including part of the gear transmission unit matched therewith);

Fig. 13 is a schematic structural diagram of the transmission link of the embodiment shown in Fig. 1;

Fig. 14 is a schematic cross-sectional structural view of the overpressure valve part of the embodiment shown in Fig. 1;

Fig. 15 is a partial transmission diagram of the gear box of the embodiment shown in Fig. 1 .

the

Detailed ways

The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

Please refer to an embodiment of a compact reciprocating suction device shown in Figures 1-15, which includes a power supply (for power supply) , a housing 300, and a power motor unit 100 and a cylinder set in the housing 300 The driving unit 200 , the gear transmission unit 500 and the control circuit board 600 . Among them, the power motor unit 100 is used to provide the original rotational torque, that is, the rotational output torque, the gear transmission unit 500 is used to decelerate and reverse the rotational output of the power motor unit 100 and output it to the end, and the cylinder drive unit 200 is used to connect the The power output by the gear transmission unit 500 is transformed into its internal volume deformation to output suction, and the control circuit board 600 is used for function control. The feature of the present invention is that the power motor unit 100 and the cylinder drive unit 200 are arranged on the same side of the gear transmission unit 500 and connected thereto, and the power motor unit 100 and the cylinder drive unit 200 are arranged side by side in parallel to the axis (here said Axis refers to the power shaft or drive shaft, such as the piston shaft of the cylinder drive unit 200, the motor shaft of the power motor unit 100), to realize the aforementioned transmission, so that the close arrangement of the motor unit 100 and the cylinder drive unit 200 ensures that the transmission saves energy at the same time The space makes the overall structure of the product compact. The key point supporting the above features is that the gear transmission unit 500 has a reversing function, which converts the rotation of the motor transmission unit around the axis into the rotation of the gear transmission unit around the output shaft, and makes the output shaft of the gear transmission unit and the motor transmission unit. The axis is perpendicular to the axis of the cylinder drive unit 200, thereby driving the timing belt pulley on the output shaft of the gear transmission unit, thereby driving the linear motion of the synchronous belt along the length direction of the piston rod, thereby driving the linear motion of the piston rod. Another key feature is that the power motor unit 100 and the cylinder drive unit 200 are arranged side by side in parallel to the axis; ; Because when they are working, the vibration and noise are mainly spread out with the axis as the core, so the power motor unit 100 and the cylinder drive unit 200 are arranged side by side and parallel to the axis, so that the side by side and parallel layout of the axis can be arranged, and the micro-offset part is regular The ground is superimposed on each other. For example, after the superposition, the vibration is mainly axial or radial, which is convenient for vibration elimination in the corresponding direction. If there is no parallel arrangement with parallel axes, the vibration direction will be messy and vibration elimination will be difficult.

The complete power transmission link of the compact reciprocating suction device is: the power motor unit 100 drives the gearbox transmission unit 500, and the gearbox transmission unit 500 synchronously transmits the driving force to the cylinder drive unit 200, and the cylinder drive unit 200 produces the suction required by the device.

During implementation, the power supply can be an external power supply (such as a transformer connected to the power input), or a built-in power supply (such as a built-in battery), as shown in the embodiment shown in Figure 1, which adopts an external power supply structure. The inner portion of the housing 300 is also provided with a filter magnetic ring 451 . The filter magnetic ring 451 is used to filter high-frequency noise and reduce electromagnetic interference. The built-in magnetic ring can be easily replaced to meet the requirements.

During the working process, the control circuit board controls the power motor unit 100 to periodically output forward and reverse, so as to realize the periodic suction and exhaust of the cylinder drive unit 200, wherein the control circuit board 600 rotates forward/reversely to the power motor unit 100 The stroke or time control of the cylinder drive unit 200 determines the strength and speed of air suction. This control method simplifies the mechanical transmission structure and is beneficial to reduce manufacturing costs.

During implementation, as shown in Figures 10 and 11, the gear transmission unit 500 may include a gear box 510, a synchronous belt transmission mechanism, and a synchronous belt bracket 560 integrally connected with the gear box 510 (housing). Wherein, the gear box 510 is used to realize the deceleration and reversing, and the synchronous belt transmission mechanism is used to convert the rotational output into a linear motion to drive the piston rod 230 described later (the synchronous belt transmission mechanism is the overall power of the gear transmission unit 500 output end), the synchronous belt bracket 560 is used to connect and position the synchronous belt transmission mechanism. Specifically, as shown in FIG. 10, the synchronous belt drive mechanism may include a synchronous toothed belt 580 (as shown in FIG. 9 ) and a driving synchronous pulley 550 and a driven synchronous pulley 570 matched with the synchronous toothed belt 580. The synchronous pulley 550 is connected to the power output end of the gearbox 510 (as shown in FIG. 10 ). the

In practice, as shown in Figures 10 and 15, the gearbox 510 may include a helical spur gear 521, a first double gear 523, a second double gear 532 and a bevel gear 533 that are meshed in sequence, wherein the helical gear The cylindrical gear 521, the first dual gear 523, and the second dual gear 532 are arranged parallel to each other and have a deceleration cooperation structure. The bevel gear 533 is arranged perpendicular to the axis of the second dual gear 532 and realizes transmission reversing through bevel gear cooperation. During implementation, the gearbox 510 can also include a power output shaft 540 used as the power output end; the bevel gear 533 is fixed on one end of the power output shaft 540; the driving synchronous pulley 550 is also fixed on the power output shaft 540 to realize The aforementioned driving synchronous pulley 550 is connected to the power output of the gearbox 510 .

Specifically, as shown in Figures 10, 11, 13, and 15, the first dual gear 523 and the second dual gear 532 are limited in the gear box by the first gear shaft 522 and the second gear shaft 531 respectively. In 510; the first dual gear 523 is composed of a large helical spur gear 5231 that cooperates with the helical spur gear 521 and a small spur gear 5232 that is integrated with the large helical spur gear 5231; the second dual gear 532 includes a The large straight helical gear 5321 matched with the small spur gear 5232, and the bevel gear 5322 fixed on the large straight helical gear 5321, the bevel gear 5322 is engaged with the bevel gear 533 to form a bevel gear transmission part 530 . The large and small gear relationship here can be understood as the aforesaid reduction matching structure.

During the working process, as shown in Figures 1 and 12, the rotating force parallel to the output shaft of the motor is converted into a rotating force perpendicular to the output shaft 110 of the motor through the bevel gear fitting part, and then through the synchronous toothed belt 580 Convert the rotational force into the linear force of the synchronous toothed belt 580 in the same direction as the axis of the cylinder drive unit 200 (see below for its structure), and drive the piston rod 230 in the cylinder drive unit 200 to move linearly, and finally drive the cylinder The internal volume of 210 changes to generate the vacuum suction required by the breast pump.

In practice, as shown in Figures 10, 11, and 13, the first gear shaft 522 is provided with a soft washer 5233 near the end of the helical spur gear 521, and the first gear shaft 522 is far away from the helical spur gear. One end of 521 is provided with an elastic washer, a steel washer and a soft washer sequentially from outside to inside to achieve gap filling, contact surface lubrication and reduction gear position offset to ensure effective engagement. It can also balance the helical cylindrical gear 521 and the large helical cylindrical gear The gear 523 cooperates with the axial force generated by the transmission; the end of the second gear shaft 531 away from the bevel gear 533 is provided with an end face sliding bearing 5331 that is in close contact with the end face of the gear, and the end face sliding bearing 5331 is concentrically sleeved on the second gear shaft 531 and fitted on the On the side wall of the inner box of the gear box 510, the end face sliding bearing 5331 plays a role of supporting and reducing friction. On the outer side of the gear box 510 corresponding to the installation position of the end face sliding bearing 5331, there is also a radial reinforcing rib structure 5123, To strengthen the structure, reduce local deformation and ensure gear engagement.

During implementation, as shown in Figure 11, the gear box 510 includes a gear box housing, and the gear box housing and the timing belt bracket 560 are integrally structured, and the integrated structure is composed of a first half shell 511 and a second half shell 512 pieces are formed. Specifically, the first half-shell 511 and the second half-shell 512 are divided structures of the integral structure along the vertical plane where the axis of the power output shaft 540 is located, which is convenient for assembly. Specifically, the synchronous belt bracket 560 and the gear case 510 can be integrally formed to enhance structural strength, reduce volume, and form an effective support for the synchronous belt transmission mechanism.

During implementation, as shown in Figures 11 and 13, the body of the motor 120 is a plane on the side of the output end, and there is a circular boss on the plane; The matching motor connection end face 5111 is provided with a circular hole adapted to the circular boss on the motor connection end face 5111. The circular boss on the output side of the motor 120 is inserted into the center of the circular hole for positioning, and the plane of the motor 120 is positioned against the motor connection end surface 5111 of the gearbox 510 for axial positioning. The positioning method is accurate, stable and convenient for assembly, and avoids the problem of difficult positioning of simple screws.

During implementation, as shown in Figure 11, it can be considered that a flexible buffer gasket is provided between the plane and the motor connection end surface 5111, and the circular boss penetrates the flexible buffer gasket, and the flexible buffer gasket can play a role in filling Cooperate with clearance and buffer noise reduction.

In practice, as shown in FIG. 12 , the cylinder drive unit 200 includes a cylinder 210, a piston rod 230 inserted into the open end of the cylinder 210 and having a T-shaped section along the insertion direction, and a piston rod 230 sleeved on the piston. The piston ring 220 on the rod 230 and matched with the inner wall of the cylinder 210; the closed end of the cylinder 210 is also provided with a pump that penetrates the side wall of the housing 300 and is used for suction/exhaust output of the suction force. suction port 240; the outer end of the piston rod 230 is fixedly connected to the timing belt 580, and the maximum stroke of the piston rod 230 driven by the timing belt 580 is equal to that of the piston rod 230 at the The maximum stroke in the cylinder 210 described above.

During implementation, as shown in Figures 9 and 10, the piston rod 230 is connected below the straight line section of the synchronous toothed belt 580, and a U-shaped guide groove 234 is also provided at the bottom of the piston rod 230. The lower part of the active synchronous pulley 550 is also provided with a pulley 235 whose upper end surface cooperates with the U-shaped guide groove 234 to guide and support the piston rod 230 to play a guiding and supporting role, improve product life and reduce noise. Specifically, during implementation, an axial depression parallel to the profile surface of the piston ring 220 may also be provided on the end surface of the large end of the piston rod 230, so that devices can be arranged on the back of the large end of the piston rod 230, and the piston rod 230 and the piston can be easily connected. The ring 220 fits with a U-shaped groove structure to ensure the stable positioning of the piston ring 220 and avoid the difficulty in processing the piston rod 230 .

Specifically, as shown in FIG. 11 , the corresponding pulley 235 is fixed on the inner bracket 400 through the wheel seat 236 , and the wheel seat 236 is composed of the first seat body 237 and the second seat body 238 .

During implementation, as shown in Figure 1, the cylinder 210 body is also provided with a flexible gasket 5113 for vibration damping at the gap between the open end side and the gear transmission unit 500; For the screw positioning plate 211 that positions the cylinder 210 relative to the gear transmission unit 500, a through hole is provided in the middle of the screw positioning plate 211; The offset from the centering of the piston rod 230 movement line reduces the vibration caused by looseness. During implementation, several screw positioning plates may also be provided on the cylinder 210 to assist positioning.

During implementation, as shown in Figures 1 and 12, a bypass port 250 perpendicular to its axis is also provided on the side wall of the cylinder 210 near its closed end, and the cylinder drive unit 200 also includes an air pipe connected to the bypass port 250. The overpressure valve 260. The bypass port is connected to the air pipe, and the size of the housing 300 needs to be increased to set the corresponding bypass port 250 and the air pipe shielding bypass port sideways, which reduces the overall volume of the product; the setting of the overpressure valve 260 enables the product to have the function of overpressure protection , when the piston rod 230 returns, if the suction port 240 is blocked (the air pipe connected to it is blocked, or the air pipe is bent), a large positive pressure will be generated in the cylinder, and the overpressure valve 260 can be opened under positive pressure to discharge the gas , Improve product safety and service life.

Specifically, as shown in Figure 14, the overpressure valve 260 may include a valve body 261, a valve cover 262 and a valve plate 267, wherein the valve body 261 has an internal exhaust passage, and the exhaust passage has an air inlet 263 and exhaust port 264, the air intake port 263 is connected with the bypass interface 250 of the cylinder 210 through the air pipe; the valve plate 267 is made of elastic material, and its inner surface sticks to the sealing surface of the valve body 261, its The upper part is positioned relative to the valve body 261, and a raised spherical surface 265 is arranged in the middle, and the spherical surface 265 is aligned with the exhaust hole 264 of the valve body 261 to form a sealing structure, and the lower part of the valve plate 267 is bent like a fishhook The bent part adopts a thickened structure, which plays the role of elastic compression, so that the valve plate 267 is pressed against the exhaust hole 264 when the positive pressure is not large, and is pushed only when the positive pressure reaches a certain value. Open to relieve pressure. The valve body 261 is also provided with a cavity isolated from the sealing surface, and the tail end of the bent portion of the valve plate 267 is embedded in the cavity. This structure ensures the reliability of sealing the exhaust port 264, avoids the failure of the overpressure valve 260 caused by problems such as aging and failure to reset, and has a simple and durable structure. Specifically, the valve plate 267 is fixed in a suspended manner, and a spherical surface 265 is arranged in the middle; when inhaling, the negative pressure valve plate 267 seals the vent hole in the cylinder; when exhausting, if a positive pressure valve plate 267 is generated Pushed away to deflate and avoid positive pressure. The overpressure valve 260 is a vertical design, that is, the contact surface of the valve plate 267 and the exhaust hole 264 is perpendicular to the horizontal plane.

Specifically, as shown in Figures 10 and 11, the driven synchronous pulley 570 may include a circular tubular synchronous belt gear 5701; the synchronous belt gear 5701 includes an outer cylindrical tooth profile and an inner hole 572, wherein the inner hole is along its radial direction There is at least one concave oil groove 5721; the driven synchronous pulley 570 also includes a central shaft 571 passing through the inner hole 572 of the synchronous belt gear 5701; There is a card slot at the position of the outer side of the end, and an elastic circlip 5723 that plays a position-limiting role is also carded on the card slot.

During implementation, as shown in Figures 9, 10, and 11, the synchronous belt bracket 560 adopts a U-shaped structure in a top view, and its bottom end is set to a channel body 5114 structure with a through-hole structure. The opening of the U-shaped body is connected, and the driven synchronous pulley 570 straddles the opening of the U-shaped body. The two wings are symmetrically provided with L-shaped mounting grooves 562, the long grooves of the L-shaped mounting grooves 562 are parallel to the transmission direction of the synchronous toothed belt 580, and the short grooves of the L-shaped mounting grooves 562 extend to the end surface of the synchronous belt bracket 560; The rod 230 penetrates the through hole of the channel body 5114 . The structure is compact and the strength is good.

Specifically, as shown in Figure 10, the two ends of the central shaft 571 of the driven synchronous pulley 570 have a step surface 5713 for installation and positioning on the outside of the elastic ring 5723, and the inner side of the washer 5712 is stuck on the step surface 5713. The side is close to the inner surface of the L-shaped mounting groove 562 of the synchronous belt bracket, and the part extending out of the L-shaped mounting groove at the two ends of the central axis 571 is screwed into and locked by the screw 5711 . This design realizes the function of the driven synchronous pulley with the smallest volume.

During implementation, as shown in Figures 1 and 2, the control circuit board 600 is arranged above the cylinder drive unit 200, and a magnetic block 221 is arranged at the upper end surface of the piston rod 230 near the piston ring 220 and the inner wall of the cylinder 210; 600 is provided with a Hall element used to sense the position of the magnetic block 221; through the induction between the Hall element and the magnetic block 221, the position of the piston rod 230 can be judged, and the control data and the control process of the motor 120 can be corrected. For example, when the control circuit Control the motor 120 to continue to rotate in one direction. At this time, the Hall element detects the magnet block 221, indicating that the piston rod 230 has reached the predetermined position. The control circuit calibrates the internal control parameters accordingly, and controls the motor 120 to reverse after the predetermined stroke. During implementation, in order to increase the stroke of the piston rod 230 and reduce the structural volume, an avoidance gap 5115 is also provided at the intersection position corresponding to the movement track of the magnetic block 221 on the square channel; the control circuit board 600 also includes a function for controlling the The electric motor unit 100 rotates the circuit of the output rotation direction, rotation speed, rotation stroke and forward and reverse conversion cycle.

During implementation, as shown in Figures 9 and 11, the cylinder drive unit 200 may be provided with a return buffer spring 543 for reducing return vibration, and the return buffer spring 543 is a coil spring. The end of the power output shaft 540 protruding from the gear box 510 body has a flat groove gap 542, and the outer side of the synchronous belt bracket 560 is also provided with a hanging column 514 beside the power output shaft 540; the return buffer spring One end of 543 is clamped on the notch 542 of the flat groove, and the other end is clamped on the hanging post 514; the outer end of the hanging post 514 is provided with a step for blocking the detachment of the return buffer spring 543. The return buffer spring 543 drives the piston rod 230 away from the cylinder 210 (drives the cylinder drive unit 200 to inhale air), so that during the air inhalation process of the cylinder 210, the driving force of the return buffer spring 543 can reduce the load on the motor 120 and balance the power of the motor Function; in the process of exhausting the cylinder 210 (the piston rod 230 returns), it is necessary to overcome the resistance of the return buffer spring 543 to accumulate elastic potential energy for the return buffer spring 543; because after the cylinder 210 inhales, its inner cavity forms a vacuum area, During the return journey, the piston rod 230 will return quickly under the action of vacuum suction, and generate noise and vibration. Therefore, the setting of the return buffer spring 543 skillfully buffers this process, reduces noise and vibration and accumulates potential energy for the suction process.

During implementation, as shown in FIGS. 10 and 11 , the power output shaft 540 straddles two bearing fulcrums, and a driving synchronous pulley 550 is arranged in the middle of the power output shaft 540 . Compared with the output shaft protruding from the outer end of the bearing of the traditional gearbox, such a structure can rotate more smoothly and accurately.

During implementation, as shown in Figures 8 and 11, the power motor unit 100 includes a motor 120, a soft washer and cooling blades 141, and the motor 120 includes a motor output shaft 110 extending forward on the axis of its main body and extending toward the The extension section 130 formed by extension (actually, both ends of the motor axis are extended, and the motor output shaft 110 and the extension section 130 are both part of the motor shaft), the helical spur gear 521 is fixed on the motor output shaft 110, the soft washer is arranged between the helical gear 521 and the main body of the motor 120, and the soft washer is in close contact with the end face of the helical gear 521 and the end face of the main body of the motor 120, In order to ensure that the motor output shaft 110 does not move axially, and to lubricate and reduce friction, and to reduce the noise generated during the relative rotation between the helical spur gear 521 and the motor body.

During implementation, as shown in Figures 10 and 11, an auxiliary support bearing is also installed at the outer end of the motor output shaft 110 corresponding to the gear box 510; the auxiliary support bearing cooperates with the outer end of the motor output shaft 110, so that The motor output shaft 110 is fixed and not deformed during the load rotation process, ensuring the smooth rotation of the motor output shaft 110 and reliable engagement of transmission gears. During implementation, the gear box 510 is also provided with a screw hole column 5125 through which the middle hole penetrates the gear box 510 and is used to lock the body of the motor 120 on the gear box 510 with screws.

During implementation, as shown in Figures 1, 8, and 11, the cooling fins 141 are fixed on the extension section 130, and the cooling fins 141 include at least two radially radiating blade units (six pieces in the illustrated embodiment), each The two blade units are arranged at intervals to form an induction gap 142; the control circuit board 600 includes a motor rotation speed sensing circuit, and the circuit also includes an infrared sensor 150 for sensing the distance between the blade units of the cooling blade 141. 150 includes a U-shaped slot, and the rotation track of the heat dissipation blade 141 passes through the middle of the U-shaped slot. The infrared sensor 150 can be made into a small circuit board 151 independent of the control circuit board 600, and is fixed near the heat dissipation blade 141 to facilitate detection. In the embodiment shown in the figure, the heat dissipation blade 141 includes six blade units in a radial radial structure, corresponding to six sensing gaps 142, and the infrared sensor 150 detects the sensing gap 142 once, that is, the motor 120 has rotated 1 /6 laps. The number of rotations of the motor 120 combined with the transmission ratio of the gearbox and the corresponding number of rotations of the active synchronous pulley 550 is then converted into the stroke of pulling the piston rod 230 , and then converted into the degree of vacuum generated by the cylinder 210 . The heat dissipation blades 141 also have a heat dissipation effect, and when the heat dissipation blades 141 are turning to the direction of the motor 120 to blow air, the heat in the housing is discharged to the outside of the housing. When the radiating blades 141 are reversed, new air outside the housing is sucked in to cool down, so as to achieve the effect of heat exchange.

An embodiment of a reciprocating suction device with a compact structure of the present invention, as shown in FIGS. and the cylinder driving unit 200 are all connected in the inner bracket 400, the setting of the inner bracket 400 makes each unit more tightly integrated, strengthens the limiting effect on each unit, improves the service life and reduces vibration. During implementation, a flexible washer 410 for isolation is also provided at the connection portion between the inner bracket 400 and the housing 300 . The flexible gasket 410 effectively isolates the housing 300 from the inner bracket 400 on which the above-mentioned units are fixed, buffers and reduces vibration, and reduces the transmission of noise and vibration.

During implementation, as shown in FIG. 1 , all key parts of the suction device can be arranged on the inner bracket 400 , and no parts are in rigid contact with the casing, which minimizes the transmission of vibration to the outside of the casing 300 . The inner bracket 400 and the housing 300 can be positioned through the screw connection penetrating through the center of the flexible gasket 410 .

During implementation, as shown in FIG. 7 , corresponding to the positions of the power motor unit 100 , the gear transmission unit 500 and the cylinder drive unit 200 on the main plane of the inner bracket 400 , a concave motor slot 420 and an inner concave motor slot 420 are respectively recessed. Concave gear case groove 440 and concave cylinder groove 430; Gear transmission unit 500 and described cylinder drive unit 200 are respectively embedded in described concave gear box groove 440 and described concave cylinder groove 430; Realize the stable limit of each unit Position and strengthen the strength of the inner bracket 400 itself with a three-dimensional structure. The space between the power motor unit 100 and the concave motor slot 420 is arranged to avoid vibration contact transmission and facilitate heat dissipation.

During implementation, as shown in FIG. 7, the concave gear box groove 440 also includes a flexible buffer sleeve 441 adapted to the structure of the groove body, and the flexible buffer sleeve 441 is isolated between the gear transmission unit 500 and the between the recessed gear box slots 440 . Because the gear transmission unit 500 is a device with high strength and large vibration, the installation of the flexible buffer sleeve 441 can play the role of isolation and buffering of vibration.

During implementation, as shown in Figures 5 and 7, vent holes 421 are evenly distributed in the concave motor slot 420, and heat dissipation holes 422 are provided on the housing 300 corresponding to the positions of the vent holes 421; a heat dissipation air path is formed to assist heat dissipation .

During implementation, as shown in Figures 7 and 9, both sides of the concave cylinder groove 430 are also provided with narrow and long facets, which cooperate with the installation of the fixed ears protruding from the opening of the cylinder. Four columns are vertically arranged on the small surface, and the control circuit board 600 is installed on the four columns. It is convenient for circuit wiring and the detection of the magnetic block 221 by the Hall element to keep the device compact and easy to assemble (the shell can be directly boxed).

During implementation, as shown in FIG. 1 , corresponding to the filter magnetic ring 451 , the inner bracket 400 is further provided with a filter magnetic ring slot 450 , and the filter magnetic ring 451 is embedded in the filter magnetic ring slot 450 . The built-in magnetic ring makes it easier to change the model to meet the requirements.

The embodiment of the compact reciprocating suction device of the present invention is shown in Fig. 1-6, the housing 300 is composed of an upper housing 310 and a lower housing 320, the inner bracket 400 is connected with the lower housing 320, The top surface of the upper housing 310 is provided with an operation interface 350, and the operation interface 350 is provided with a display screen and buttons arranged around the display screen; the outer contour of the housing 300 is in the shape of a cuboid with chamfered edges. The edge has a larger chamfering radius than other edges; the casing 300 is also provided with raised anti-slip lines 343 .

Specifically, as shown in Figures 1-6 during implementation, the vertical sides of the larger chamfering radius are arc-shaped corners, and the anti-skid lines 343 are provided on the upper side 341 and the lower side 342 of the housing 300, A plurality of pattern protrusions 343 parallel to each other are arranged transversely on the upper side 341 and the lower side 342 respectively. An operation panel boss 345 protrudes upward from the front surface 344 of the housing 300 , and the meeting position between the operation panel boss 345 and the front surface 344 is designed as a smooth arc. The operation interface 350 is arranged on the boss 345 of the operation panel. The design of the appearance structure can greatly enhance the aesthetic appearance of the present invention.

Specifically, as shown in Figure 6, the operation interface 350 is circular, and the display screens are two LED display screens arranged side by side in the center of the area and used to display suction and speed values respectively; There are seven ovals in total, including: the "start/pause" key set on the upper part of the display screen, the memory keys and massage keys respectively set on both sides of the display screen, which are set under the corresponding LED display screen, showing Two speed increase/decrease keys arranged up and down, and two suction increase/decrease keys arranged up and down. The user-friendly interface it provides makes breast pumping easier and more convenient, and satisfies the user's convenient operation requirements to the greatest extent.

Specifically, as shown in Figure 1 during implementation, these buttons can be made into a film shape, and the corresponding buttons are physically arranged on the control circuit board 600. The screen is the corresponding transparent window, and the display screen entity is arranged on the control circuit board 600 , and the display screen entity is just below the transparent window after the casing 300 is assembled.

During implementation, the flexible gasket 410, the flexible buffer sleeve 441, the flexible gasket 5113, and the flexible buffer gasket can be made of materials with soft characteristics such as silicone material, rubber material, and silicon rubber material. The soft washer can be a wear-resistant and elastic washer such as a nylon washer.

For the control principle of the device of the present invention, the following scheme can be adopted during specific implementation: the operation interface function is realized by the control circuit board 600, and the control circuit board 600 includes a programmable control module, a pulse width modulation (PWM) module, and a bridge power amplifier module and infrared sensor input module. The programmable control module controls the flow, logic and calculations of the circuit board. When the "Start/Pause" button is pressed, if the motor 120 is in a stopped state, the bridge power amplifier module outputs a forward current, and the motor 120 drives the piston rod 230 to pull outward; if the motor 120 is in a running state, stop the current output to stop the device . When the piston rod 230 is pulled outward, the infrared sensing input module records the number of times that the infrared sensor 150 senses through the sensing interval 142 of the heat dissipation blade 141, and the programmable control module calculates the number of rotations of the motor 120, which is fixed by the gear transmission unit 500 The rotation ratio, calculates the stroke that the piston rod 230 pulls. The bridge power amplifying module outputs a reverse current after the piston rod 230 reaches the stroke, driving the piston rod 230 to retreat in the reverse direction. When the magnetic block 221 on the piston rod 230 is sensed by the Hall element at the starting point, the bridge power amplifying module again Output positive current to drive the piston rod 230 for the next cycle. When the suction increase/decrease key is pressed, the programmable control module records the number of stages displayed on the suction force, converts the corresponding number of rotations of the motor 120, and changes the stroke of the piston rod 230. When the speed increase/decrease key is pressed, the pulse width modulation (PWM) module changes the output drive voltage accordingly, thereby increasing/decreasing the rotation speed of the motor 120, thereby increasing/decreasing the speed of the piston rod 230. When the memory key is pressed, the programmable control module records the currently set suction and speed values (or restores the suction and speed to the memory values). When the massage button is pressed, the programmable control module controls the piston rod 230 to run at a specific speed and suction value.

During implementation, the gear case can be made of all-aluminum alloy and the gears can be made of high-precision steel, so as to effectively transmit high power and run at high speed under full load, which greatly improves milk suction efficiency and suppresses running noise. Compared with the traditional plastic gear box, the plastic gear and the bracketless design are more reliable, strong and durable; the high-strength material makes the gear reduction mechanism smaller and more compact than the traditional reduction mechanism.

The present invention also provides a breast pump, which is characterized by comprising the aforementioned compact reciprocating suction device.

During implementation, the breast pump also includes a trachea connected to the suction port 240 and a breast shield. The aforesaid compact reciprocating suction device is the power supply unit of the breast pump.

A breast pump constructed from an embodiment of a compact reciprocating suction device as shown in Figure 1-15: the volume of its main body (power supply unit, namely the compact reciprocating suction device) can be as large as the palm of an adult, It is convenient for breastfeeding mothers to carry it out for use; it is suitable for large-caliber cylinders and long-stroke cylinders, and the dynamic suction of the end breast shield can reach the performance of hospital-grade breast pumps; it is a high-efficiency electric breast pump constructed by breastfeeding mothers. The pumping device can save breastfeeding time and increase the amount of breastfeeding; it can adopt all-steel gear structure, synchronous belt cylinder drive, and return buffer spring design, so that the operating noise can be effectively suppressed, so that the baby will not be disturbed when breastfeeding mothers are breastfeeding . It wraps the bottom of the gearbox through a flexible buffer sleeve 441, so that it is isolated from the inner bracket without rigid contact; there is a flexible gasket 410 between the inner bracket and the bottom shell, and there is no rigid contact; there is a flexible pad between the connecting surface of the cylinder and the gear box The pieces 5113 are isolated and have no rigid contact. In the present invention, flexible materials are used to isolate components that may transmit vibration as much as possible, so that the running noise is further effectively suppressed, and the noise of the electric breast pump is minimized.

During implementation, the breast pump can use a DC power supply. After the power supply is plugged in, the breast pump beeps to indicate that the power supply is connected, and the LCD display shows the suction force and speed. When the "start/pause" key is pressed, the air cylinder 210 will reciprocate according to the suction force and speed displayed on the LCD, and the air pipe at the end of the air cylinder 210 will output vacuum to the breast shield. Users can adjust the suction power through the suction power increase/decrease key, and adjust the speed through the speed increase/decrease key. When the user presses the massage button on the operation interface 350, the air cylinder 210 will suck in a small stroke quickly, and the small vacuum suction will be output to the breast shield at a high frequency so that the breasts can achieve a massage effect, promoting lactation and increasing milk output. When the user presses the memory key on the operation interface 350, the desired combination of suction force and speed can be memorized, and the previously memorized suction force and speed can also be reset.

A reciprocating suction device with a compact structure improved by the present invention can also be applied to other fields that need to generate a small displacement vacuum, including but not limited to fields such as medical treatment, health care, and beauty treatment.

The above content is a further detailed description of the present invention in conjunction with specific embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (24)

1. A reciprocating suction device with a compact structure, which includes a power supply, a casing (300) and a power motor unit (100) arranged in the casing (300) for providing the original rotational torque, for connecting the The gear transmission unit (500) for decelerating and reversing the rotation output of the power motor unit (100), and the cylinder for connecting the power output of the gear transmission unit (500) into its own internal volume deformation to output suction The drive unit (200) and the control circuit board (600) for function control are characterized in that: the power motor unit (100) and the cylinder drive unit (200) are arranged side by side in parallel to the axis, and the gear transmission unit (500) on the same side and connected to it. 2. The reciprocating suction device with compact structure according to claim 1, characterized in that: the gear transmission unit (500) includes a gear box (510) for realizing the deceleration and reversing, as the The synchronous belt transmission mechanism at the power output end of the gear transmission unit (500), and the synchronous belt bracket (560) connected with the gear box (510) for connecting and positioning the synchronous belt transmission mechanism; the synchronous belt transmission The mechanism includes a synchronous toothed belt (580) and a driving synchronous pulley (550) and a driven synchronous pulley (570) matched with the synchronous toothed belt (580). The driving synchronous pulley (550) is connected to the The power output of the gearbox (510). 3. The reciprocating suction device with compact structure according to claim 2, characterized in that: the gear box (510) includes a helical spur gear (521), a first double gear (523), a second Two double gears (532) and bevel gears (533), in which the helical cylindrical gear (521), the first double gear (523), and the second double gear (532) are arranged in parallel with the axes and are in a deceleration fit structure, so The bevel gear (533) is arranged vertically to the axis of the second duplex gear (532) and realizes transmission reversing through the cooperation of bevel teeth; the gear box (510) also includes a power output shaft used as the power output end ( 540); the bevel gear (533) is fixed at one end of the power output shaft (540); the power output of the drive synchronous pulley (550) connected to the gearbox (510) refers to the synchronous belt transmission The driving synchronous pulley (550) of the mechanism is also fixed on the power output shaft (540). 4. The reciprocating suction device with compact structure according to claim 3, characterized in that: the first double gear (523) and the second double gear (532) pass through the first gear shaft (522) and The second gear shaft (531) is limited in the gear box (510); the first gear shaft (522) is provided with a soft washer near the end of the helical cylindrical gear (521), and the first gear The end of the shaft (522) away from the helical gear (521) is provided with elastic washers, steel washers and soft washers in sequence from outside to inside; the end of the second gear shaft (531) away from the bevel gear (533) is set There is an end face sliding bearing (5331) close to the end face of the gear, and the end face sliding bearing (5331) is concentrically sleeved on the second gear shaft (531) and fitted on the inner box side wall of the gear box (510) , on the outer side of the gear box (510), a radial rib plate structure (5123) corresponding to the installation position of the end face sliding bearing (5331) is provided. 5. The reciprocating suction device with compact structure according to claim 3, characterized in that: the gear box (510) includes a gear box housing, and the gear box housing and the timing belt bracket (560) Integral structure, the integrated structure is formed by splicing the first half shell (511) and the second half shell (512), the first half shell (511) and the second half shell (512) are in the shape of the The integral structure is divided into structures along the vertical plane where the axis of the power output shaft (540) is located. 6. The reciprocating suction device with compact structure according to claim 3, characterized in that: the motor (120) body is a plane near the output end, and there is a circular boss on the plane; the gear box (510 ) is provided with a motor connection end surface (5111) adapted to the plane of the motor (120), and a round hole adapted to the circular boss is provided on the motor connection end surface (5111). 7. The reciprocating suction device with compact structure according to claim 2, characterized in that: the cylinder drive unit (200) comprises a cylinder (210), a cylinder (210) embedded in the open end and along the A piston rod (230) with a T-shaped section in the embedding direction, and a piston ring (220) sleeved on the piston rod (230) and matched with the inner wall of the cylinder (210); in the cylinder (210) The closed end of the closed end is also provided with a suction port (240) that penetrates the side wall of the housing (300) and is used for suction/exhaust output of the suction force; the outer end of the piston rod (230) is fixedly connected to the On the timing belt (580), the maximum stroke of the piston rod (230) driven by the timing belt (580) is equal to the maximum stroke of the piston rod (230) in the cylinder (210). journey. 8. The reciprocating suction device with compact structure according to claim 7, characterized in that: the piston rod (230) is connected below the straight section of the synchronous toothed belt (580), and the piston rod The lower part of (230) is also provided with a U-shaped guide groove (234), and the lower part of the driving synchronous pulley (550) is also provided with an upper end surface that cooperates with the U-shaped guide groove to guide and support the piston rod (230) The pulley (235); the large end surface of the piston rod (230) is also provided with an axial depression parallel to the contour surface of the piston ring (220). 9. The reciprocating suction device with compact structure according to claim 7, characterized in that: the body of the cylinder (210) is further provided with a gap between the open end side and the gear transmission unit (500) for A flexible gasket (5113) for vibration damping; a screw positioning plate (211) for positioning the cylinder (210) relative to the gear transmission unit (500) is provided at the midline position of the closed end of the cylinder (210), A through hole is provided in the middle of the screw positioning plate (211); a bypass port (250) perpendicular to its axis is provided on the side wall of the cylinder (210) near its closed end, and the cylinder drive unit (200) also It includes an overpressure valve (260) connected to the bypass port (250) through a gas pipe. 10. The reciprocating suction device with compact structure according to claim 9, characterized in that: the overpressure valve (260) comprises a valve body (261), a valve cover (262) and a valve plate (267), wherein, The valve body (261) has an internal exhaust channel, the exhaust channel has an air inlet (263) and an exhaust port (264), and the air inlet (263) and the cylinder (210) The bypass interface (250) is connected through the air pipe; the valve plate (267) is made of elastic material, its inner surface sticks to the sealing surface of the valve body (261), its upper part is positioned relative to the valve body (261), and its middle A raised spherical surface (265) is provided, and the spherical surface (265) is aligned with the exhaust hole (264) of the valve body (261) to form a sealing structure, and the lower part of the valve plate (267) is bent like a fishhook , the bent part adopts a thickened structure; the valve body (261) is also provided with a cavity isolated from the sealing surface, and the tail end of the bent part of the valve plate (267) is embedded in the cavity body. 11. The reciprocating suction device with compact structure according to claim 2, characterized in that: the driven synchronous pulley (570) comprises a circular tubular synchronous belt gear (5701); the synchronous belt gear (5701) comprises The outer cylindrical tooth profile and the inner hole (572), wherein the inner hole has at least one concave oil groove (5721) along its radial direction; the driven synchronous pulley also includes a central Shaft (571); the central shaft (571) is provided with slots on the outer sides corresponding to the two ends of the timing belt gear (5701), and the slots are also fitted with elastic Retaining ring (5723). 12. The reciprocating suction device with compact structure according to claim 2, characterized in that: the synchronous belt bracket (560) is U-shaped when viewed from above, and its bottom end is a channel body (5114) with a through-hole structure , the through hole of the channel body (5114) communicates with the opening of the U-shaped body, the driven synchronous pulley (570) straddles the opening of the U-shaped body, and the driving synchronous pulley (550) is set In the channel body (5114), L-shaped installation grooves (562) are arranged symmetrically on both wings at the opening of the U-shaped body where the driven synchronous pulley (570) is set, and the length of the L-shaped installation groove (562) The slot is parallel to the transmission direction of the synchronous toothed belt (580), and the short slot of the L-shaped installation slot (562) extends to the end face of the synchronous belt bracket (560); the piston rod (230) penetrates the The through hole of the channel body (5114). 13. The reciprocating suction device with compact structure according to claim 12, characterized in that: the control circuit board (600) is arranged above the cylinder drive unit (200), close to the piston rod (230) The piston ring (220) and the inner wall of the cylinder (210) are provided with a magnetic block (221), and the control circuit board (600) is provided with a Hall element for sensing the position of the magnetic block (221); the square An avoidance gap (5115) is also provided at the position of the channel corresponding to the movement track of the magnetic block (221); the control circuit board (600) also includes a rotation direction for controlling the rotation output of the motor unit (100), The circuit of rotation speed, rotation stroke and forward and reverse conversion period. 14. The reciprocating suction device with compact structure according to claim 3, characterized in that: the cylinder drive unit (200) is provided with a return buffer spring (543) for reducing return vibration, and the buffer spring (543 ) is a coil spring; the end of the power output shaft (540) protruding from the body of the gearbox (510) has a flat groove gap (542), and the outer side of the synchronous belt bracket (560) is on the power output shaft ( 540) is also provided with a hanging column (514); one end of the return buffer spring (543) is clamped on the flat groove gap (542), and the other end is clamped on the hanging column (514) Above; the outer end of the hanging column (514) is provided with a step for blocking the detachment of the return buffer spring (543). 15. The reciprocating suction device with compact structure according to claim 3, characterized in that: the power motor unit (100) includes a motor (120), a soft gasket and cooling blades (141), and the motor (120 ) includes a motor output shaft (110) extending forward on the axis of its main body and an extension section (130) extending backward, the helical cylindrical gear (521) and the soft washer are installed on the on the motor output shaft (110); wherein the soft washer is located between the helical spur gear (521) and the main body of the motor (120), and the soft washer and the helical spur gear (521 ) and the end face of the main body of the motor (120) are in close contact. 16. The reciprocating suction device with compact structure according to claim 15, characterized in that: an auxiliary support bearing is installed at the outer end of the gear box (510) corresponding to the output shaft (110) of the motor, The gear box ( 510 ) is also provided with a screw hole column through which the middle hole penetrates the gear box ( 510 ) for cooperating with screws to lock the body of the motor ( 120 ) on the gear box ( 510 ). 17. The reciprocating suction device with compact structure according to claim 15, characterized in that: the heat dissipation blades (141) are fixed on the extension section (130), and the heat dissipation blades (141) include at least two The blade units in a radial radiation structure are arranged at intervals between every two blade units; the control circuit board (600) includes a motor rotation number sensing circuit, and the circuit also includes a circuit for sensing the heat dissipation blades (141) The infrared sensor (150) is spaced between the blade units, and the infrared sensor (150) includes a U-shaped slot, and the rotation track of the heat dissipation blade (141) passes through the middle of the U-shaped slot. 18. The reciprocating suction device with compact structure according to claims 1-17, characterized in that: the housing (300) also includes an inner bracket (400), the power motor unit (100), Both the gear transmission unit (500) and the cylinder drive unit (200) are connected in the inner support (400); the connection between the inner support (400) and the housing (300) is provided with a flexible Gasket (410). 19. The compact reciprocating suction device according to claim 18, characterized in that: the main plane of the inner bracket (400) corresponds to the power motor unit (100), the gear transmission unit (500) and the cylinder The position of the driving unit (200) is respectively recessed and provided with a concave motor slot (420), a concave gear box slot (440) and a concave cylinder slot (430), and the power motor unit (100) and the internal The recessed motor slots (420) are arranged to avoid space, and the gear transmission unit (500) and the cylinder drive unit (200) are respectively embedded in the recessed gear box slot (440) and the recessed cylinder slot ( 430). 20. The reciprocating suction device with compact structure according to claim 19, characterized in that: the concave gear box groove (440) also includes a flexible buffer sleeve (441) adapted to the structure of the groove body, and the flexible buffer sleeve (441) The buffer sleeve (441) is isolated and arranged between the gear transmission unit (500) and the concave gear case groove (440). 21. The reciprocating suction device with compact structure according to claim 19, characterized in that: vent holes (421) are evenly distributed in the concave motor slot (420), and the casing (300) is connected with A cooling hole (422) is provided at the corresponding position of the ventilation hole (421); there are also narrow and long small surfaces on both sides of the concave cylinder groove (430), and four vertically arranged on the small surface. Columns, the control circuit board (600) is installed on the four columns. 22. The reciprocating suction device with compact structure according to claims 1-17, characterized in that: the housing (300) is composed of an upper housing (310) and a lower housing (320), and the inner The bracket (400) is connected to the lower casing (320), and the top surface of the upper casing (310) is provided with an operation interface (350), and a display screen and a surrounding display screen are provided in the operation interface (350). The buttons provided; the outer contour of the housing (300) is in the shape of a cuboid with chamfered edges, and one vertical side of the housing (300) has a larger chamfering radius than other edges; the housing (300) The outside is also provided with raised anti-slip lines (343). 23. The reciprocating suction device with compact structure according to claim 22, characterized in that: the operation interface (350) is circular, and the two display screens are arranged side by side in the center of the area and are used to display LED display for suction and speed values; there are seven keys in an oval shape, including: the "on/pause" key set on the upper part of the display screen, the memory keys and the The massage button is arranged under the corresponding LED display screen, and there are two speed increase/decrease keys arranged up and down, and two suction force increase/decrease keys arranged up and down. 24. A breast pump, characterized by comprising the compact reciprocating pumping device according to any one of claims 1-23.

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