Breast pump and wearable breast pump

Abstract

The utility model discloses a breast pump which comprises a gear box body provided with a mounting hole and a guide groove. The reduction gear set is mounted in the gear box body; the motor is fixed outside the gear box body and is connected with the reduction gear set; the screw directly faces the mounting hole and extends out of the gearbox body, one end of the screw is provided with a limiting hole, and the other end of the screw is provided with a piston assembly; the guide pin is inserted into the limiting hole, and the two ends of the guide pin are clamped in the two guide grooves respectively; the gear comprises a gear body arranged on the screw in a sleeving mode, rotating teeth formed on the outer circumferential side and the inner circumferential side of the gear body and a spiral annular ball groove, the gear body is rotationally supported on the gear box body, and the rotating teeth are meshed with the reduction gear set; and the ball group is rotationally arranged between the ball groove and the screw rod. The utility model further provides a wearable breast pump. Compared with the prior art, the breast pump and the wearable breast pump are exquisite in structure, friction of axial movement of the screw can be greatly reduced, power loss of the motor is low, the mute effect is good, and the user experience effect is good.

Description

Technical Field

[0001] This utility model relates to the field of maternal and infant products, and in particular to a breast pump and a wearable electric breast pump used in wearable electric breast pumps. Background Technology

[0002] Wearable breast pumps are becoming increasingly popular among breastfeeding women, as they not only free up their hands but also allow for the temporary collection of excess breast milk. Wearable electric breast pumps, in particular, use a breast pump for automatic milk collection.

[0003] Existing wearable breast pumps include a milk collection cup, a main body covering the opening of the milk collection cup and having a milk suction chamber, a shell assembly detachably installed on the main body and forming an installation space, a bra mounted on the front of the main body, and a power component, with the bra communicating with the milk suction chamber. One existing power component is a combination of a negative pressure pump and a venting solenoid valve. The negative pressure pump draws air from the milk suction chamber, and a one-way valve is located at the bottom of the suction chamber. When suctioning, the one-way valve closes, generating negative pressure, thereby drawing milk from the breast against the bra and into the milk suction chamber. When the venting solenoid valve opens to release air, the negative pressure disappears, and the one-way valve opens, allowing the drawn milk to flow into the milk collection cup. Existing technology uses a combination of an air pump and a solenoid valve to control the negative pressure, which cannot achieve precise control within any time range during milk suction, resulting in a poor user experience.

[0004] Therefore, it is necessary to provide a new breast pump and wearable breast pump to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to overcome the above-mentioned technical problems and provide a breast pump and wearable breast pump with a compact structure and good user experience.

[0006] To achieve the above objectives, this utility model provides a breast pump for use in a wearable electric breast pump, comprising:

[0007] A gearbox housing has an internal mounting space, and the gearbox housing is provided with a through mounting hole and two guide grooves formed inside the gearbox housing; the mounting hole connects the mounting space to the outside, and the guide grooves are respectively located on opposite sides of the gearbox housing and extend along the axial direction of the mounting hole;

[0008] A reduction gear set, which is installed inside the gearbox;

[0009] An electric motor is fixed to the outer periphery of the gearbox body. The output shaft of the motor passes through the gearbox body and extends to be fixedly connected to the input gear of the reduction gear set, for driving the input gear of the reduction gear set to rotate.

[0010] A screw is provided facing the mounting hole and extends through the mounting hole to the outside of the mounting space; the end of the screw located in the mounting space is provided with a limiting hole that extends radially through it, and the end of the screw located outside the mounting space is provided with a piston assembly;

[0011] A guide pin is inserted and fixed in the limiting hole, and the two ends of the guide pin are respectively engaged in the two guide grooves and form a sliding connection.

[0012] The gear includes a gear body sleeved on the screw and coaxially arranged with the mounting hole, rotating teeth formed on the outer periphery of the gear body, and helical annular ball grooves formed on the inner periphery of the gear body; the gear body is supported inside the gearbox and forms a rotatable connection, and the rotating teeth mesh with the output gear of the reduction gear set; and...

[0013] A ball assembly comprising multiple balls is provided, which is rotatably connected between the ball groove and the screw, and the ball assembly is always located within two adjacent lead grooves of the screw during its circumferential motion.

[0014] Preferably, the breast pump further includes a bearing, the outer peripheral side of which is fixed to the inner peripheral side of the gearbox, and the inner peripheral side of which is sleeved and fixed to the gear body.

[0015] Preferably, the gear body includes a gear sleeve and a gear sleeve cover, both annular and respectively sleeved on the screw, with the gear sleeve cover covering the gear sleeve; the guide pin is located on the side of the gear sleeve cover away from the gear sleeve; the rotating teeth are formed on the outer periphery of the gear sleeve; the ball groove is located at the connection between the gear sleeve and the gear sleeve cover, and is formed by the outward indentation of the inner periphery of the gear sleeve and the gear sleeve cover; the bearing includes two bearings, which are respectively sleeved and fixed on the gear sleeve and the gear sleeve cover, with the rotating teeth spaced between the two bearings.

[0016] Preferably, the gear body includes an annular gear sleeve fitted onto the screw and a pressure block; the ball groove is formed on the inner circumference of the gear sleeve, one side of the gear sleeve is spaced apart from the screw to form an installation gap, and the installation gap communicates with the ball groove; the pressure block has an arc-shaped groove on the side near the gear sleeve, the arc of the arc-shaped groove matches the ball groove, the pressure block is inserted into the installation gap and closes the ball groove through the arc-shaped groove; the bearing includes two bearings, which are respectively fitted and fixed onto the gear sleeve and the rotating teeth are located between the two bearings.

[0017] Preferably, the gearbox body includes a gearbox bottom cover and a gearbox top cover that covers the gearbox bottom cover and together form the installation space; the mounting hole is provided through the gearbox bottom cover, the guide groove is provided on the gearbox top cover, the reduction gear set is installed on the gearbox bottom cover, and the outer peripheral side of the gear body is rotatably supported by the gearbox bottom cover.

[0018] This utility model also provides a wearable breast pump, including the breast pump described above.

[0019] Preferably, the wearable breast pump further includes a main body, a main body cover, a one-way valve, a breast pump cover, and a milk collection cup;

[0020] The main body includes a first shell with one end open and one end closed, forming a milk suction chamber; a second shell stacked and fixed to the first shell, having one end open and one end closed, forming a piston chamber; a milk inlet hole penetrating the bottom of the first shell; and an air passage penetrating the bottom of the second shell; the orientation of the opening end of the first shell is opposite to the orientation of the opening end of the second shell; the piston chamber is located above the milk suction chamber and communicates with the milk suction chamber through the air passage; and the one-way valve is installed at the milk inlet hole.

[0021] The milk collection cup is installed at the bottom of the first housing and forms a detachable connection with the first housing;

[0022] The breast pump is funnel-shaped and is installed at the open end of the first housing and communicates with the breast pumping chamber.

[0023] The breast pump is positioned opposite the piston chamber. The gearbox is fixedly mounted on the main cover and presses the piston assembly to seal the piston chamber. The screw extends into the piston chamber, and the end of the screw away from the gearbox reciprocates on the side of the air passage away from the gearbox.

[0024] Preferably, the piston assembly includes a piston located within the second housing and extending along the inner side of the second housing to its open end, a piston panel detachably fixed to the side of the piston near the gearbox body, and a piston base plate detachably fixed to the side of the piston away from the gearbox body, wherein the piston panel is detachably sleeved and fixed to the screw.

[0025] Preferably, the breast pump includes a tube inserted into the open end of the first housing, an annular fixed wall formed by bending outwards radially from the outer end of the tube, a trumpet-shaped support wall extending outwards from the outer end of the tube, an arc-shaped baffle formed from the inner circumference of the tube, and a nipple opening penetrating the baffle wall; the tube is detachably fixedly connected to the first housing, the fixed wall is simultaneously attached to the side of the second housing away from its open end and the milk collection cup, and the support wall communicates with the breast pumping chamber through the nipple opening.

[0026] Preferably, the wearable breast pump further includes a main body cover and a wrench. The main body cover is disposed on the main body. The main body cover has two oppositely arranged insertion holes and a protruding wrench fixing platform. Two wrench pressing walls are provided on opposite sides of the outer periphery of the main body. Each wrench pressing wall is located between one of the insertion holes and one of the wrench fixing platforms on the same side. The two ends of the wrench are respectively inserted into the two insertion holes to form a rotatable connection. The wrench is engaged with the lower side of the wrench fixing platform to form a lock. The wrench is pressed against the two wrench pressing walls to press the main body tightly against the main body cover.

[0027] Compared with the prior art, the breast pump and wearable breast pump provided by this utility model, by setting a motor, a reduction gear set, a screw, a guide pin, a gear, and a ball bearing assembly in a gearbox, with the screw positioned directly opposite the mounting hole of the gearbox and extending beyond the mounting space through the mounting hole, the guide pin being inserted into a limiting hole at one end of the screw inside the gearbox, and the two ends of the guide pin being respectively engaged in two guide grooves provided on the gearbox to form a sliding connection, and a piston assembly being provided at one end of the screw outside the gearbox; the gear includes a component sleeved on the screw and engaging with... The mounting holes are coaxially arranged in the form of a gear body, rotating teeth formed on the outer periphery of the gear body, and a spiral annular ball groove formed on the inner periphery of the gear body; the gear body is supported inside the gearbox and forms a rotatable connection, and the rotating teeth mesh with the output gear of the reduction gear set; the ball set includes multiple balls, and the ball set is sandwiched between the ball groove and the screw to form a rotatable connection; the output shaft of the motor passes through the gearbox and extends to be fixedly connected to the input gear of the reduction gear set, for driving the input gear of the reduction gear set to rotate. With the above structural design, the motor drives the reduction gear set to rotate radially, which in turn drives the transmission of the ball assembly in the ball groove. Because one end of the screw has a guide pin that slides along the axial direction of the screw, the screw cannot rotate radially. Instead, the radial rotation of the gear is converted into the axial reciprocating motion of the screw. The screw further drives the piston assembly to move synchronously, realizing the pumping action. In the above structure, because the ball assembly is always located in two adjacent lead grooves of the screw during its circular cyclic motion, this combination structure greatly reduces the frictional resistance of the screw's axial movement, thereby reducing the power loss of the motor, making the motor more compact, the overall product structure more sophisticated, and the transmission of the ball assembly has a better noise reduction effect. By precisely controlling the forward and reverse rotation and start and stop actions of the motor, the pumping force is precisely controlled to improve comfort. It has high stability and provides a better user experience. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0029] Figure 1 A three-dimensional structural schematic diagram of a breast pump provided for an embodiment of this utility model;

[0030] Figure 2 An exploded three-dimensional structural diagram of a breast pump provided in an embodiment of this utility model;

[0031] Figure 3 A cross-sectional schematic diagram of a breast pump provided in an embodiment of this utility model;

[0032] Figure 4 A schematic diagram of another assembly structure of the gear and screw of the breast pump provided in this embodiment of the utility model;

[0033] Figure 5 A three-dimensional structural diagram of a wearable breast pump provided in an embodiment of this utility model;

[0034] Figure 6 This is a cross-sectional schematic diagram of a wearable breast pump provided in an embodiment of the present invention. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0036] The terminology used in the embodiments disclosed in this utility model is merely for describing particular embodiments and is not intended to limit the utility model. Unless otherwise stated herein, the singular expressions used in the embodiments of this utility model and the appended claims are also intended to refer to their plural expressions.

[0037] It should be noted that the terms "above," "below," "left," and "right" mentioned in the embodiments of this utility model are used to describe the placement state in the accompanying drawings and should not be interpreted as limiting embodiments of this utility model. Furthermore, it should be understood that, in the text, when referring to an element that constitutes "above" or "below" another element, it is possible that the element directly constitutes "above" or "below" the other element, or it is possible that the element constitutes "above" or "below" the other element through an intermediate element.

[0038] Please see Figure 1-3 As shown, this utility model provides a breast pump 100, which is used in a wearable electric breast pump, including: a gearbox 1, a reduction gear set 2, a motor 3, a screw 4, a guide pin 5, a gear 6, and a ball bearing set 7.

[0039] The gearbox 1 has an internal mounting space, and the gearbox 1 is provided with a through mounting hole 10 and two guide grooves 11 formed inside the gearbox 1. The mounting hole 10 connects the mounting space to the outside, and the guide grooves 11 are located on opposite sides of the gearbox 1 and extend along the axial direction of the mounting hole 10.

[0040] The reduction gear set 2 is installed inside the gearbox 1.

[0041] The motor 3 is fixed to the outer periphery of the gearbox 1. The output shaft of the motor 3 passes through the gearbox 1 and extends to be fixedly connected to the input gear 21 of the reduction gear set 2, and is used to drive the input gear 21 of the reduction gear set 2 to achieve radial rotation.

[0042] The screw 4 is positioned opposite the mounting hole 10 and extends through the mounting hole 10 to the outside of the mounting space. The end of the screw 4 located within the mounting space is provided with a limiting hole 41 that extends radially through it, and the end of the screw 4 located outside the mounting space is provided with a piston assembly 42.

[0043] The guide pin 5 is inserted and fixed in the limiting hole 41, and the two ends of the guide pin 5 are respectively engaged in the two guide grooves 11 and form a sliding connection.

[0044] The gear 6 includes a gear body 61 sleeved on the screw 4 and coaxially arranged with the mounting hole 10, rotating teeth 62 formed on the outer periphery of the gear body 61, and a spiral annular ball groove 63 formed on the inner periphery of the gear body 61.

[0045] The gear body 61 is supported inside the gearbox 1 and forms a rotatable connection, and the rotating teeth 62 mesh with the output gear 22 of the reduction gear set 2.

[0046] The ball assembly 7 includes multiple balls, which are sandwiched between the ball groove 63 and the screw 4 to form a rotatable connection. During the circumferential motion of the ball assembly 7, it is always located in two adjacent lead grooves of the screw 4.

[0047] With the above structural configuration, motor 3 drives gear 6 to achieve radial rotation via reduction gear set 2. Gear 6 then transmits power to screw 4 via ball bearing set 7. Simultaneously, because screw 4 has a guide pin 5 at its end, which slides within a guide groove 11 extending axially along screw 4, the transmission between gear 6 and screw 4 changes from radial rotation of gear 6 to axial movement of screw 4. During its cyclic motion, the ball bearing set 7 remains within two adjacent lead grooves of screw 4, ensuring high precision in the axial movement of screw 4. This combined structure significantly reduces the frictional resistance of screw 4's axial movement, thereby reducing the power loss of motor 3, making motor 3 more compact, and the overall product structure more refined. Furthermore, precise control of motor 3's forward and reverse rotation and start / stop actions precisely controls the suction force, improving comfort and enhancing the user experience. The ball bearing set 7 also provides quieter transmission, and its high stability further enhances the user experience. Meanwhile, the reduction gear set 2 is enclosed by the gearbox 1, further reducing noise and making it quieter.

[0048] In addition, the guide groove 11, besides cooperating with the guide pin 5 to guide the radial movement into the axial movement of the screw 4, can also limit the screw 4 by restricting the sliding stroke of the guide pin 5 through the guide groove 11, thereby limiting the range of the screw 4 in its axial direction.

[0049] To further improve the noise reduction effect, in this embodiment, the breast pump 100 also includes a bearing 8. The outer circumference of the bearing 8 is fixed to the inner circumference of the gearbox 1, and the inner circumference of the bearing 8 is sleeved and fixed to the gear body 61. Thus, the rotational connection between the gear 6 and the gearbox 1 is achieved through the bearing 8, further reducing friction noise and making the noise reduction effect more obvious.

[0050] In this embodiment, for ease of installation and maintenance, the gear body 61 includes a gear sleeve 611 and a gear sleeve cover 612, both annular and respectively fitted onto the screw 4, with the gear sleeve cover 612 covering the gear sleeve 611. The guide pin 5 is located on the side of the gear sleeve cover 612 away from the gear sleeve 611. The rotating teeth 62 are formed on the outer periphery of the gear sleeve 611. The ball groove 63 is located at the connection between the gear sleeve 611 and the gear sleeve cover 612, and is formed by recesses from the inner periphery of both the gear sleeve 611 and the gear sleeve cover 612. Two bearings 8 can be provided, each fitted and fixed to the gear sleeve 611 and the gear sleeve cover 612 respectively. The rotating teeth 62 are spaced apart between the two bearings 8, facilitating meshing between the output gear 22 of the reduction gear set 2 and the bearing.

[0051] Of course, the structure of the gear is not limited to the above configuration. As long as the annular cyclic motion of the ball assembly 7 is within the adjacent lead groove of the screw 4, other installation structures and methods are also feasible. For example, as Figure 4 As shown, the gear body 61 includes an annular gear sleeve 611' and a pressure block 612' fitted onto the screw 4. A ball bearing groove 63 is formed on the inner circumference of the gear sleeve 611'. One side of the gear sleeve 611' forms an installation gap 60 with the screw 4, and the installation gap 60 communicates with the ball bearing groove 63. The pressure block 612' has an arc-shaped groove 601 on its side near the gear sleeve 611'. The arc of the arc-shaped groove 601 matches the ball bearing groove 63. The pressure block 612' is inserted into the installation gap 60 and closes the ball bearing groove 63 through the arc-shaped groove 601. Alternatively, two bearings 8 can be provided, each fitted and fixed onto the gear sleeve 611', with the rotating gear 62 positioned between the two bearings 8.

[0052] It should be noted that the lead groove on the screw 4 is matched to the round balls of the ball assembly 7.

[0053] Continue to participate Figure 1-3 As shown in this embodiment, specifically, the gearbox body 1 includes a gearbox bottom cover 12 and a gearbox top cover 13 that covers the gearbox bottom cover 12 and together form the installation space. The mounting hole 10 is provided through the gearbox bottom cover 12, the guide groove 11 is provided in the gearbox top cover 13, the reduction gear set 2 is installed on the gearbox bottom cover 12, and the outer periphery of the gear body 61 is rotatably supported on the gearbox bottom cover 12, specifically through the aforementioned bearing 8, which will not be described in detail here.

[0054] Please combine Figure 5-6 As shown, this utility model also provides a wearable breast pump 200, which includes the breast pump 100 provided by this utility model.

[0055] Specifically, in this embodiment, the wearable breast pump 200 also includes a main body 201, a main body cover 202, a one-way valve 203, a breast pump cover 204, and a milk collection cup 205.

[0056] The main body 201 includes a first housing 2011 with one end open and the other end closed, forming a milk suction chamber 20; a second housing 2012 stacked and fixed to the first housing 2011, having one end open and the other end closed, forming a piston chamber 30; a milk inlet 40 penetrating the bottom of the first housing 2011; and an air passage 50 penetrating the bottom of the second housing 2012.

[0057] The opening of the first housing 2011 faces in the opposite direction to the opening of the second housing 2012. The piston chamber 30 is located above the milk suction chamber 20 and communicates with the milk suction chamber 20 through the air passage 50. The one-way valve 203 is installed in the milk inlet 40.

[0058] The milk collection cup 205 is installed at the bottom of the first housing 2011 and forms a detachable connection with the first housing 2011.

[0059] The breast pump 204 is trumpet-shaped and is installed at the open end of the first housing 2011 and communicates with the breast pumping chamber 20.

[0060] The breast pump 100 is positioned opposite the piston chamber 30. The gearbox 1 is fixedly mounted on the main cover 202, such that the second housing 2012 abuts against the edge of the piston assembly 42 and then against the gearbox 1 to seal the piston chamber 30. The piston assembly 42 is made of an elastic material. The screw 4 extends into the piston chamber 30, and the end of the screw 4 away from the gearbox 1 reciprocates on the side of the air passage 50 away from the gearbox 1.

[0061] Specifically, in this embodiment, the piston assembly 42 includes a piston 421 located within the second housing 2012 and extending along the inner side of the second housing 2012 to its open end; a piston panel 422 detachably fixedly installed on the side of the piston 421 near the gearbox 1; and a piston base plate 423 detachably fixedly installed on the side of the piston 421 away from the gearbox 1. The piston panel 422 is detachably sleeved and fixed to the screw 4. The open end of the second housing 2012 abuts against the opposite edge of the open end of the piston 421, and then abuts against the gearbox 1, which is equivalent to clamping the second housing 2021 and the open end with the open end of the gearbox 1, achieving the purpose of sealing the piston cavity. After the piston assembly 42 and the screw 4 are assembled, the suction force generated in the piston cavity 30 can be stopped and controlled at any suction value, providing users with a good extreme value experience. The detachable fixing method of the sub-components of the piston assembly 42 and the detachable fixed connection design with the screw 4 are both beneficial for cleaning.

[0062] The breast pump 204 includes a tube 2041 inserted into the open end of the first housing 2011, a ring-shaped fixing wall 2042 formed by bending outward radially from the outer end of the tube 2041, a trumpet-shaped support wall 2043 extending outward from the outer end of the tube 2041, an arc-shaped baffle 2044 formed from the inner circumference of the tube 2041, and a nipple opening 2045 penetrating the baffle 2044, which is equivalent to the baffle 2044 having a ring-shaped arc surface structure. After the support wall 2043 of the breast pump 204 fits against the woman's breast, the breast is limited by the baffle 2044 and the nipple enters the breast pumping chamber 20 through the nipple opening 2045, thereby preventing milk from leaking from around the nipple. Similarly, the breast pump will not leak when the person is lying down.

[0063] The cover tube 2041 is detachably fixed to the first housing 2011. The fixed wall 2042 is simultaneously attached to the side of the second housing 2012 away from its opening end and the milk collection cup 205. The support wall 2043 is connected to the milk suction chamber 20 through the nipple opening 2045.

[0064] More preferably, the wearable breast pump 200 also includes a wrench 207, and the main body cover 202 covers the main body 201 to protect the piston 421 and related structures installed in the second housing 2012 of the main body 201.

[0065] Because piston movement involves the stability and durability of airtightness, related components need to be installed tightly and be durable and stable. Therefore, in this embodiment, the main body cover 202 is provided with two oppositely arranged insertion holes 2021 and a protruding wrench fixing platform 2022. Two wrench pressing walls 2013 are provided on opposite sides of the outer periphery of the main body 201. The wrench pressing walls 2013 are specifically formed on the outer periphery of the second housing 2012 of the main body 201. Each wrench pressing wall 2013 is located between one of the insertion holes 2021 and one of the wrench fixing platforms 2022 on the same side. Both ends of the wrench 207 are inserted into the two sockets 2021 to form a rotatable connection, and the wrench 207 is pressed against the two wrench pressure walls 2013, and then locked to the lower side of the wrench fixing platform 2022. At this time, the wrench 207 is pressed against the two wrench pressure walls 2013 at both ends of the main body 201, so that the main body 201 abuts against the main body cover 202 to form a detachable fixation. This quick-release structure is not only tightly installed, but also easy to disassemble and clean.

[0066] It should be emphasized that in the above-described structure of the present invention, both suction and exhaust are active and are driven by a motor. This is completely different from the existing technology that uses a vent valve to exhaust air, thus achieving the effect of precisely controlling the suction force and improving comfort.

[0067] Compared with the prior art, the breast pump and wearable breast pump provided by this utility model, by setting a motor, a reduction gear set, a screw, a guide pin, a gear, and a ball bearing assembly in a gearbox, with the screw positioned directly opposite the mounting hole of the gearbox and extending beyond the mounting space through the mounting hole, the guide pin being inserted into a limiting hole at one end of the screw inside the gearbox, and the two ends of the guide pin being respectively engaged in two guide grooves provided on the gearbox to form a sliding connection, and a piston assembly being provided at one end of the screw outside the gearbox; the gear includes a component sleeved on the screw and engaging with... The mounting holes are coaxially arranged in the form of a gear body, rotating teeth formed on the outer periphery of the gear body, and a spiral annular ball groove formed on the inner periphery of the gear body; the gear body is supported inside the gearbox and forms a rotatable connection, and the rotating teeth mesh with the output gear of the reduction gear set; the ball set includes multiple balls, and the ball set is sandwiched between the ball groove and the screw to form a rotatable connection; the output shaft of the motor passes through the gearbox and extends to be fixedly connected to the input gear of the reduction gear set, for driving the input gear of the reduction gear set to rotate. With the above structural design, the motor drives the reduction gear set to rotate radially, which in turn drives the transmission of the ball assembly in the ball groove. Because one end of the screw has a guide pin that slides along the axial direction of the screw, the screw cannot rotate radially. Instead, the radial rotation of the gear is converted into the axial reciprocating motion of the screw. The screw further drives the piston assembly to move synchronously, realizing the pumping action. In the above structure, because the ball assembly is always located in two adjacent lead grooves of the screw during its circular cyclic motion, this combination structure greatly reduces the frictional resistance of the screw's axial movement, thereby reducing the power loss of the motor, making the motor more compact, the overall product structure more sophisticated, and the transmission of the ball assembly has a better noise reduction effect. By precisely controlling the forward and reverse rotation and start and stop actions of the motor, the pumping force is precisely controlled to improve comfort. It has high stability and provides a better user experience.

[0068] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A breast pump, used in a wearable electric breast pump, characterized in that, include: A gearbox housing has an internal mounting space, and the gearbox housing is provided with a through mounting hole and two guide grooves formed inside the gearbox housing; the mounting hole connects the mounting space to the outside, and the guide grooves are respectively located on opposite sides of the gearbox housing and extend along the axial direction of the mounting hole; A reduction gear set, which is installed inside the gearbox; An electric motor is fixed to the outer periphery of the gearbox body. The output shaft of the motor passes through the gearbox body and extends to be fixedly connected to the input gear of the reduction gear set, for driving the input gear of the reduction gear set to rotate. A screw is provided facing the mounting hole and extends through the mounting hole to the outside of the mounting space; the end of the screw located in the mounting space is provided with a limiting hole that extends radially through it, and the end of the screw located outside the mounting space is provided with a piston assembly; A guide pin is inserted and fixed in the limiting hole, and the two ends of the guide pin are respectively engaged in the two guide grooves and form a sliding connection. The gear includes a gear body sleeved on the screw and coaxially arranged with the mounting hole, rotating teeth formed on the outer periphery of the gear body, and a spiral annular ball groove formed on the inner periphery of the gear body; the gear body is supported inside the gearbox and forms a rotatable connection, and the rotating teeth mesh with the output gear of the reduction gear set; as well as, A ball assembly comprising multiple balls is provided, which is rotatably connected between the ball groove and the screw, and the ball assembly is always located within two adjacent lead grooves of the screw during its circumferential motion.

2. The breast pump according to claim 1, characterized in that, The breast pump also includes a bearing, the outer circumference of which is fixed to the inner circumference of the gearbox, and the inner circumference of which is sleeved and fixed to the gear body.

3. The breast pump according to claim 2, characterized in that, The gear body includes a gear sleeve and a gear sleeve cover, both of which are annular and respectively sleeved on the screw. The gear sleeve cover is disposed on the gear sleeve. The guide pin is located on the side of the gear sleeve cover away from the gear sleeve. The rotating teeth are formed on the outer circumference of the gear sleeve. The ball groove is located at the connection between the gear sleeve and the gear sleeve cover, and is formed by the outward indentation of the inner circumference of the gear sleeve and the gear sleeve cover. The bearing includes two bearings, which are respectively sleeved and fixed on the gear sleeve and the gear sleeve cover. The rotating teeth are spaced apart between the two bearings.

4. The breast pump according to claim 2, characterized in that, The gear body includes an annular gear sleeve fitted onto the screw and a pressure block; the ball groove is formed on the inner circumference of the gear sleeve, one side of the gear sleeve is spaced apart from the screw to form an installation gap, and the installation gap communicates with the ball groove; the pressure block has an arc-shaped groove on the side near the gear sleeve, the arc of the arc-shaped groove matches the ball groove, the pressure block is inserted into the installation gap and closes the ball groove through the arc-shaped groove; the bearing includes two bearings, which are respectively fitted and fixed onto the gear sleeve and the rotating teeth are located between the two bearings.

5. The breast pump according to claim 1, characterized in that, The gearbox body includes a gearbox bottom cover and a gearbox top cover that covers the gearbox bottom cover and together form the installation space; the mounting hole is provided through the gearbox bottom cover, the guide groove is provided in the gearbox top cover, the reduction gear set is installed on the gearbox bottom cover, and the outer peripheral side of the gear body is rotatably supported by the gearbox bottom cover.

6. A wearable breast pump, characterized in that, Includes the breast pump as described in any one of claims 1-5.

7. The wearable breast pump according to claim 6, characterized in that, The wearable breast pump also includes a main body, a main body cover, a one-way valve, a breast pump cover, and a milk collection cup; The main body includes a first shell with one end open and one end closed, forming a milk suction chamber; a second shell stacked and fixed to the first shell, having one end open and one end closed, forming a piston chamber; a milk inlet hole penetrating the bottom of the first shell; and an air passage penetrating the bottom of the second shell; the orientation of the opening end of the first shell is opposite to the orientation of the opening end of the second shell; the piston chamber is located above the milk suction chamber and communicates with the milk suction chamber through the air passage; and the one-way valve is installed at the milk inlet hole. The milk collection cup is installed at the bottom of the first housing and forms a detachable connection with the first housing; The breast pump is funnel-shaped and is installed at the open end of the first housing and communicates with the breast pumping chamber. The breast pump is positioned opposite the piston chamber. The gearbox is fixedly mounted on the main cover and presses the piston assembly to seal the piston chamber. The screw extends into the piston chamber, and the end of the screw away from the gearbox reciprocates on the side of the air passage away from the gearbox.

8. The wearable breast pump according to claim 7, characterized in that, The piston assembly includes a piston located within the second housing and extending along the inner side of the second housing to its open end, a piston panel detachably fixed to the side of the piston near the gearbox, and a piston base plate detachably fixed to the side of the piston away from the gearbox. The piston panel is detachably sleeved and fixed to the screw.

9. The wearable breast pump according to claim 7, characterized in that, The breast pump includes a tube inserted into the open end of the first housing, a ring-shaped fixed wall formed by bending outwards radially from the outer end of the tube, a trumpet-shaped support wall extending outwards from the outer end of the tube, an arc-shaped baffle formed from the inner circumference of the tube, and a nipple opening penetrating the baffle wall; the tube is detachably fixedly connected to the first housing, the fixed wall is simultaneously attached to the side of the second housing away from its open end and the milk collection cup, and the support wall communicates with the milk pumping chamber through the nipple opening.

10. The wearable breast pump according to claim 7, characterized in that, The wearable breast pump also includes a main body cover and a wrench. The main body cover is disposed on the main body. The main body cover has two oppositely arranged insertion holes and a protruding wrench fixing platform. Two wrench pressing walls are provided on opposite sides of the outer periphery of the main body. Each wrench pressing wall is located between one of the insertion holes and one of the wrench fixing platforms on the same side. The two ends of the wrench are respectively inserted into the two insertion holes to form a rotatable connection. The wrench is engaged with the lower side of the wrench fixing platform to form a lock. The wrench is pressed against the two wrench pressing walls to press the main body tightly against the main body cover.

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