CN111658859A

CN111658859A - Breast pump

Info

Publication number: CN111658859A
Application number: CN202010622760.1A
Authority: CN
Inventors: 程克勇
Original assignee: Feimile Shanghai Maternal And Child Products Co ltd
Current assignee: Feimile Shanghai Maternal And Child Products Co ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2020-09-15

Abstract

The invention discloses a breast pump, which comprises a main machine and a three-way assembly, wherein an insertion groove of the main machine is connected with an insertion part of the three-way assembly in an insertion manner, the three-way assembly comprises a suction cylinder shell and a suction piston arranged in an inner cavity of the suction cylinder shell, the suction piston is used for dividing the inner cavity of the suction cylinder shell into an inner cavity communicated with a milk sucking channel and a suction cavity communicated with a suction pump of the main machine, a vent hole communicated with the suction cavity is formed in the suction cylinder shell, a suction port communicated with the suction pump is formed in the insertion groove of the main machine, and a horn-shaped sealing ring is arranged at the suction port, so that after the three-way assembly is inserted in place, the horn-shaped sealing ring can cover the vent hole and is compressed to be tightly attached to the outer surface of the suction cylinder shell. The breast pump can effectively solve the problem of poor assembling effect between the conventional breast pump three-way assembly and a host.

Description

Breast pump

Technical Field

The invention relates to the technical field of mother and infant articles, in particular to a breast pump.

Background

The breast pump generally mainly comprises a main machine and a three-way assembly, and a feeding bottle assembly is correspondingly arranged on some breast pumps so as to be connected with a milk outlet of the three-way assembly. The three-way assembly is mainly a three-way connector, wherein one connector is used for air inlet and outlet, one connector is provided with a milk cover, and the other connector is a milk outlet used for being connected with the milk bottle assembly.

The current wearable breast pump can better solve the problem that the breast pump is inconvenient to carry. The wearable breast pump is directly plugged into the bra for sucking milk, does not need to be held by hands, and can liberate two hands. The prior wearable breast pump is easy to leak air due to the problem of structural design, so that the breast pump has no suction.

In summary, how to effectively solve the problem of poor assembling effect between the three-way assembly of the breast pump and the host is a problem which needs to be solved urgently by the technical personnel in the field at present.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a breast pump, which can effectively solve the problem of poor assembling effect between the three-way assembly and the main unit of the prior breast pump.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a breast pump, includes host computer and tee bend assembly, the cartridge groove of host computer with the cartridge portion plug-in connection of tee bend assembly, tee bend assembly include suction cylinder shell and install in suction piston in the suction cylinder shell intracavity, suction piston be used for with the suction cylinder shell inner chamber is separated into with the inside chamber of suckling passageway intercommunication and is used for with the suction chamber of host computer suction pump intercommunication, be provided with on the suction cylinder shell with the blow vent of suction chamber intercommunication, the cartridge inslot of host computer be provided with the suction opening of suction pump intercommunication, suction opening department is provided with horn type sealing washer, with tee bend assembly cartridge targets in place the back, horn type sealing washer can cover and establish on the blow vent and compressed with suction cylinder shell surface closely laminates.

In the breast pump, when the breast pump is assembled, the three-way assembly is inserted into the insertion groove in the preset installation direction until the three-way assembly is inserted in place, and at the moment, the air vent and the air suction port can be connected in a sealing mode. In this breast pump, the suction jar sets up on the tee bend assembly completely to make on the suction jar blow vent and suction mouth as later stage equipment part, again because the blow vent is less with the equal oral area of suction mouth interface, conveniently carry out sealing connection, it is smaller to interfere each other at the male in-process simultaneously, makes to use more convenient and fast, and the connection between the suction chamber of suction pump and suction jar is very good simultaneously, has fully guaranteed the leakproofness. To sum up, this breast pump can solve the problem that the equipment effect is not good between present breast pump tee bend assembly and the host computer effectively.

Preferably, the suction port department card is equipped with elastic pipe fitting, elastic pipe fitting one end pass through three way connection respectively with suction pump and solenoid valve intercommunication, the other end do the suction port in order to be used for with the suction chamber intercommunication, elastic pipe fitting with horn type sealing washer integrated into one piece.

Preferably, the elastic pipe fitting with the horn type sealing washer is silica gel integrated into one piece.

Preferably, in the horizontal direction of grafting direction, one side of tee bend assembly is provided with out the milk mouth, the opposite side is provided with suction cylinder shell, have on the suction cylinder shell the relative grafting direction slope of the shell face of blow vent sets up, the horn type sealing washer corresponds the slope setting in order to meet the blow vent.

Preferably, one of the insertion groove and the insertion part is provided with an elastic clamping protrusion, and the other is provided with a clamping groove matched with the elastic clamping protrusion, so that clamping is realized in the insertion direction.

Preferably, the feeding bottle connector comprises a feeding bottle connector, wherein the upper end of the feeding bottle connector is inserted into the main machine and is fixedly connected with the main machine through a lockable buckle.

Preferably, feeding bottle connector upper end import is provided with silica gel check valve spare, silica gel check valve spare is provided with loudspeaker type portion in order to laminate tee bend assembly milk outlet sets up, loudspeaker type portion relative plug-in direction slope sets up to meet in the plug-in direction tee bend assembly milk outlet.

Preferably, a vibrator is arranged in the main machine to vibrate the three-way assembly when the three-way assembly is opened.

Preferably, suction cylinder shell include cylinder body shell and with the cylinder cap shell of cylinder body shell joint, be provided with on the cylinder cap shell the blow vent, the extrusion all around of suction piston cylinder body shell with between the cylinder cap shell, and the middle part can be protruding so that low pressure side cavity diminishes, high pressure side cavity grow to the low pressure side.

Preferably, the cylinder cover shell is clamped with the periphery of the cylinder body shell through three groups of clamping sleeves and clamping protrusions which are uniformly distributed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of an assembly structure of a breast pump according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a breast pump according to an embodiment of the present invention;

FIG. 3 is a schematic view of an appearance structure of a breast pump according to an embodiment of the present invention;

fig. 4 is a schematic diagram of an internal structure of a host according to an embodiment of the present invention;

FIG. 5 is a schematic view of an installation structure of a three-way joint according to an embodiment of the present invention;

FIG. 6 is a schematic view of a connection structure of the feeding bottle assembly according to the present invention;

FIG. 7 is a schematic structural diagram of a tee assembly according to an embodiment of the present invention;

FIG. 8 is an exploded view of a tee assembly according to an embodiment of the present invention;

fig. 9 is a schematic cross-sectional structure diagram of a tee joint assembly according to an embodiment of the present invention.

The drawings are numbered as follows:

the milk bottle comprises a main machine 1, a three-way assembly 2, a milk bottle assembly 3, an insertion groove 11, an elastic pipe fitting 12, a horn-shaped sealing ring 13, a vibrator 14, a three-way connector 15, an elastic clamping protrusion 16, a suction pump 17, an electromagnetic valve 18, a lockable buckle 19, a suction cylinder shell 21, a suction piston 22, a vent 23, a pipeline piece 24, a horn-shaped breast cover shell 25, a milk outlet 26, a breast silica gel cover 27, a cylinder cover shell 211, a cylinder shell 212, a silica gel one-way valve piece 31 and a milk bottle connector 32.

Detailed Description

The embodiment of the invention discloses a breast pump, which can effectively solve the problem of poor assembly effect between the conventional breast pump three-way assembly and a host.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-9, fig. 1 is a schematic view of an assembly structure of a breast pump according to an embodiment of the present invention; FIG. 2 is a schematic cross-sectional view of a breast pump according to an embodiment of the present invention; FIG. 3 is a schematic view of an appearance structure of a breast pump according to an embodiment of the present invention; fig. 4 is a schematic diagram of an internal structure of a host according to an embodiment of the present invention; FIG. 5 is a schematic view of an installation structure of a three-way joint according to an embodiment of the present invention; FIG. 6 is a schematic view of a connection structure of the feeding bottle assembly according to the present invention; FIG. 7 is a schematic structural diagram of a tee assembly according to an embodiment of the present invention; FIG. 8 is an exploded view of a tee assembly according to an embodiment of the present invention; fig. 9 is a schematic cross-sectional structure diagram of a tee joint assembly according to an embodiment of the present invention.

In one embodiment, the present embodiment provides a breast pump, where the breast pump may be a wearable breast pump. The breast pump mainly comprises a main machine 1 and a three-way assembly 2, and is generally provided with a feeding bottle assembly 3.

The main unit 1 mainly includes a casing and a suction pump disposed inside the casing, and is generally provided with a power supply and a controller to enable the suction pump to perform a suction operation. Wherein the three-way assembly 2 mainly comprises a milk sucking channel and a suction cylinder communicated with the milk sucking channel to suck air. One end of the milk sucking channel is provided with a breast shield to cover the breast for sucking the milk from the breast, and the other end of the milk sucking channel is communicated with the milk bottle to guide the milk sucked by the breast shield into the milk bottle.

Wherein the cartridge groove 11 of host computer 1 and the cartridge portion plug-in connection of tee bend assembly 2 to make tee bend assembly 2 snap-on in the cartridge groove 11 of host computer 1, fixed with accomplishing the cartridge, in order to avoid tee bend assembly 2 to expose too much, can make tee bend assembly 2 whole be cartridge portion, with embedding cartridge groove 11 completely, in order to guarantee overall structure's compactness, can make cartridge groove 11 cell wall profile modeling setting, with the cartridge portion of laminating tee bend assembly 2 completely.

The three-way assembly 2 includes a suction cylinder housing 21 and a suction piston 22 installed in the inner cavity of the suction cylinder housing 21, but may also include other structures, such as a trumpet-shaped breast cover 25 and a duct member 24 forming the milk suction passage. The suction piston 22 is arranged in the inner cavity of the suction cylinder shell 21 to divide the inner cavity of the suction cylinder shell 21 into an inner cavity communicated with the milk sucking channel and a suction cavity communicated with the suction pump of the main machine 1, so that when the air pressure of the suction cavity is lower than that of the inner cavity, the suction piston 22 is pushed by the pressure difference to compress the suction cavity, the volume of the inner cavity is increased, the air pressure is reduced, the milk sucking channel is sucked, and the three-way assembly 2 has a sucking effect on the breast; when the air pressure of the suction cavity rises and is higher than the air pressure of the inner cavity, the suction piston 22 is pushed by the pressure difference to compress the inner cavity, so that the air pressure of the inner cavity rises to realize resetting, and the effect of changing the intermittent suction can be achieved by repeatedly changing the air pressure of the suction cavity.

Wherein the suction cylinder housing 21 is provided with a vent 23 communicating with the suction chamber for introducing gas into or discharging gas from the suction chamber through the vent 23. The vent 23 should not be too large to avoid inconvenient ventilation and too small during later assembly, which is likely to cause unsmooth air inlet and outlet.

Be provided with the suction opening with the suction pump intercommunication in the cartridge groove 11 of the host computer 1 that corresponds to be provided with horn type sealing washer 13 in suction opening department, with in 2 cartridge in tee bend assemblies back that target in place, horn type sealing washer 13 can cover and establish on blow vent 23, and compressed closely laminating with the suction cylinder shell 21 surface, so that horn type sealing washer 13 seals the linking between suction opening and the blow vent 23, can suck gas to blow vent 23 with guaranteeing that the suction opening, and then carry out gaseous suction to the suction chamber. When tee bend assembly 2 wherein adorns, can begin to produce the extrusion force to horn type sealing washer 13 before the cartridge targets in place, until the installation targets in place, horn type sealing washer 13 begins to produce certain deformation, and then guarantees the leakproofness that links up between horn type sealing washer 13 and the blow vent 23 to guarantee the suction effect. It should be noted that air may be taken in through the suction port and through the vent 23, but air may be taken in through other ports.

In the breast pump, when assembling, the three-way assembly 2 is inserted into the insertion groove 11 in the predetermined direction, and the sealing connection between the air vent 23 and the air suction port can be completed at the moment when the three-way assembly is inserted in place. In this breast pump, the suction jar sets up on tee bend assembly 2 completely to make on the suction jar blow vent 23 and suction mouth as later stage equipment part, again because the less interface of the equal oral area of blow vent 23 and suction mouth, conveniently carry out sealing connection, it is smaller to interfere each other at the inserted in-process simultaneously, makes to use more convenient and fast, and the connection between the suction chamber of suction pump and suction jar is very good simultaneously, has fully guaranteed the leakproofness. To sum up, the breast pump can effectively solve the problem of poor assembling effect between the prior breast pump three-way assembly 2 and the host 1.

For the convenience of connection, an elastic tee joint piece can be clamped at the suction port, and is generally made of an elastic material, such as silica gel, other rubber and the like, wherein the elastic tee joint piece has an elastic function of ensuring that the tightness and the connection strength of connection are maintained when the joint piece is connected with a corresponding component with higher rigidity. The three interfaces of the elastic tee joint piece are respectively used for being communicated with the suction pump, the electromagnetic valve and the suction cavity, wherein the electromagnetic valve is fixed in the shell of the main machine 1, so that when the suction pump sucks, the electromagnetic valve is correspondingly controlled to be closed at the moment, and therefore, only gas in the suction cavity is sucked when the suction pump sucks; when the suction pump stops sucking, the corresponding control electromagnetic valve is opened at the moment, and then external air is introduced into the suction cavity through the electromagnetic valve, so that the air pressure in the suction cavity rises. Wherein the elastic tee joint piece and the horn-shaped sealing ring 13 are integrally formed, if the elastic tee joint piece and the horn-shaped sealing ring 13 are integrally formed silica gel.

For convenience, the elastic three-way connector is preferably replaced by an elastic tube 12, one end of the elastic tube 12 is respectively communicated with the suction pump 17 and the electromagnetic valve 18 through a three-way connector 15, the other end of the elastic tube is a suction port for communicating with a suction cavity, and the elastic tube 12 and the horn-shaped sealing ring 13 can be integrally formed, for example, the elastic tube 12 and the horn-shaped sealing ring 13 are integrally formed by silica gel, the horn-shaped sealing ring 13 can be integrally formed at one end of the elastic tube 12, and the three-way connector at the other end of the elastic tube has a clamping protrusion with an annular protrusion, so that the three components are combined to form an i shape to be clamped on the shell of the main machine 1. The elastic pipe 12 can be conveniently clamped on the casing of the host 1 or the base of the host 1, and an annular clamping groove with an outward opening can be directly arranged on the side edge of the elastic pipe 12.

For the convenience of providing the above-mentioned suction cylinder, it is preferable here that, in the direction transverse to the plugging direction, one side of the three-way assembly 2 is provided with a milk outlet 26, the other side is provided with a suction cylinder shell 21, mainly the upper side is provided with the suction cylinder shell 21, and the lower side is provided with a milk outlet 26 for connecting with the feeding bottle assembly 3. Wherein the outer surface of the suction cylinder shell 21 with the vent 23 is obliquely arranged relative to the plugging direction, and the horn-shaped sealing ring 13 is correspondingly obliquely arranged to face the vent 23, so that in the plugging direction, the horn-shaped sealing ring 13 and the suction cylinder shell 21 generate corresponding resisting force corresponding to the outer surface to squeeze the horn-shaped sealing ring 13. It should be noted that the surface of the housing having the vent 23 therein does not need to be inclined too much to ensure that the corresponding deformation of the trumpet seal 13 is larger as the tee assembly 2 is inserted deeper.

Wherein the three-way assembly 2 is of a bra type in the whole structure, the part occupying a larger space is the bra, the specific three-way assembly 2 comprises a horn-shaped breast cover 25 and a pipeline piece 24 forming the milk sucking channel, the suction cylinder shell 21 can be arranged on the upper side of the pipeline piece 24, and after the three-way assembly 2 is inserted in place, the horn-shaped breast cover 25 can be inserted into the insertion groove 11 of the host 1, so that the whole structure is more compact. The trumpet-shaped breast casing 25 is generally sleeved with a breast silica gel cover 27 to ensure the comfort of breast contact.

In order to ensure stable insertion between the three-way assembly 2 and the host 1, one of the insertion groove 11 and the insertion portion is preferably provided with an elastic clamping protrusion 16, and the other one is preferably provided with a clamping groove matched with the elastic clamping protrusion 16, so that clamping is realized in the insertion direction, and the insertion groove 11 and the insertion portion are prevented from being separated from insertion at will. Elastic clamping protrusions 16 can be respectively arranged on two transverse sides of the insertion groove 11, each elastic clamping protrusion 16 mainly comprises a hood-shaped clamping protrusion and a spring with one end fixed on the host 1, the hood-shaped clamping protrusion covers the other end of the spring, the outer surface of each hood-shaped clamping protrusion is spherical, and a mounting hole is correspondingly formed in the bottom of the insertion groove 11 to be embedded into the elastic clamping protrusion 16. And the above-mentioned catching grooves may be provided at both lateral sides of the above-mentioned piping member 24.

Wherein, for the convenience of installing and cleaning the internal suction piston 22, it is preferable here that the suction cylinder shell 21 includes a cylinder shell 212 and a cylinder cover shell 211 clamped with the cylinder shell 212, so that the cylinder cover shell 211 is conveniently detached from the cylinder shell 212, wherein the cylinder cover shell 211 is provided with the above vent 23, and the periphery of the suction piston 22 is extruded between the cylinder shell 212 and the cylinder cover shell 211, so as to fix the periphery of the suction piston 22 through the extrusion of the cylinder shell 212 and the cylinder cover shell 211, and simultaneously ensure the separation effect of the suction piston 22 on the internal cavity and the suction cavity, and ensure the separation between the two. And the middle part of the suction piston 22 can generate convex or concave deformation so as to be convex to the low-pressure side to make the low-pressure side cavity smaller and the high-pressure side cavity larger. Wherein the suction piston 22 may be a basin-type piston or a plate-type piston. In order to ensure the clamping strength, the cylinder cover shell 211 and the periphery of the cylinder body shell 212 can be clamped through three groups of clamping sleeves and clamping protrusions which are uniformly distributed. In order to facilitate the manufacture, the cylinder housing 212, the trumpet-shaped breast casing 25, and the duct member 24 forming the milk suction passage may be integrally formed. Wherein the bottom of the cylinder housing 212 is provided with a hole aligned with a corresponding opening on the upper side of the pipe member 24 for communicating with the pipe cavity of the pipe member 24, wherein the cylinder housing 212 may be a flat box shape as a whole.

As mentioned above, the breast pump further comprises a feeding bottle connector 32, wherein for the convenience of connection, it is preferable that the feeding bottle connector 32 is inserted into the main body 1 at the upper end and is fixedly connected with the main body through the lockable buckle 19, wherein the lockable buckle 19 can prevent the feeding bottle connector 32 from being separated from the main body 1 when locked, and can enable the lockable buckle 19 to be opened when unlocked, so that the feeding bottle connector 32 can be separated from the main body 1. The lower end of the feeding bottle connector 32 is used for connecting with a feeding bottle, and the upper end is used for inserting into the main body 1 to connect with the milk outlet 26 in the main body 1 to receive milk flowing out from the milk outlet 26. The lockable buckle 19 is formed by adding a rigid locking pin or a locking protrusion on the basis of a common buckle, and is correspondingly provided with a handle part to operate whether the locking pin is opened or closed, wherein the common handle part is rotatably connected with a base or a shell of the host 1.

Wherein, the inlet at the upper end of the feeding bottle connector 32 is provided with a silica gel one-way valve 31, so that the feeding bottle connector can be closed during suction, and the suction effect of the milk cover is ensured. Wherein silica gel one-way valve 31 is provided with horn type portion and sets up with the play milk mouth 26 of laminating three-way assembly 2, so that insert back in host computer 1 from the side of host computer 1 and downside respectively at three-way assembly 2 and feeding bottle connector 32, silica gel one-way valve 31 advance the milk mouth can directly laminate with play milk mouth 26 through horn type portion, so that go out the direct flow of milk that milk mouth 26 flows to horn type portion in, and then directly flow in silica gel one-way valve 31, in order directly to flow in the feeding bottle, and then guaranteed the inside cleanliness factor of host computer 1, avoid milk to be contaminated effectively simultaneously, guarantee the cleanliness factor of milk. Wherein horn type portion relative plug-in direction slope sets up to in the plug-in direction meet milk outlet 26 of tee assembly 2, so that insert the in-process that targets in place at tee assembly 2, go out milk outlet 26 department wall portion and produce the extrusion to horn type portion, and then guarantee the leakproofness between the two. Specifically, for the convenience of setting, the horn-shaped portion and the insertion direction of the three-way assembly 2 can be set at an angle of 45 degrees.

Furthermore, in order to make the breast pump more comfortable and applicable, it is preferable that a vibrator 14 is provided in the main body 1 to vibrate the three-way assembly 2 when the breast pump is turned on, so that the breast is slightly massaged when the breast pump is sucking milk. The vibrator 14 may be a vibration motor, and since the three-way assembly 2 is hard connected to the main body 1, when the main body 1 vibrates, the vibration force can be transmitted to the three-way assembly 2, so that the three-way assembly 2 vibrates, and the bra can follow the vibration, and the bra is attached to the breast, so as to massage the breast.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a breast pump, includes host computer and tee bend assembly, the cartridge groove of host computer with the cartridge portion plug-in connection of tee bend assembly, its characterized in that, tee bend assembly include suction cylinder shell with install in the suction piston of suction cylinder shell intracavity, the suction piston be used for with suction cylinder shell inner chamber is separated into with the inside chamber of suckling passageway intercommunication and is used for with the suction chamber of host computer suction pump intercommunication, be provided with on the suction cylinder shell with the blow vent of suction chamber intercommunication, the cartridge inslot of host computer be provided with the suction opening of suction pump intercommunication, suction opening department is provided with horn type sealing washer, with after tee bend assembly cartridge targets in place, horn type sealing washer can cover establish on the blow vent and compressed with closely laminate with suction cylinder shell surface.

2. The breast pump as set forth in claim 1 wherein the suction port is provided with an elastic tube, one end of the elastic tube is connected to the suction pump and the solenoid valve through a tee joint, the other end of the elastic tube is the suction port for connecting to the suction chamber, and the elastic tube and the trumpet-shaped sealing ring are integrally formed.

3. The breast pump as set forth in claim 2 wherein the resilient tube and the trumpet seal are integrally formed of silicone.

4. The breast pump as set forth in claim 1 wherein the three-way assembly is provided with a milk outlet on one side and the suction cylinder housing on the other side in a direction transverse to the insertion direction, the outer surface of the suction cylinder housing having the vent opening is disposed obliquely with respect to the insertion direction, and the bell-shaped seal ring is disposed correspondingly obliquely so as to face the vent opening.

5. The breast pump as set forth in claim 4 wherein the insertion groove and the insertion portion are provided with an elastic locking protrusion and a locking groove for engaging with the elastic locking protrusion, respectively, so as to lock in the insertion direction.

6. The breast pump as set forth in claim 1 including a bottle connector having an upper end inserted into the main unit and fixedly connected to the main unit by a lockable buckle.

7. The breast pump as claimed in claim 6 wherein the feeding bottle connector is provided at an upper inlet thereof with a silicone check valve member, the silicone check valve member is provided with a flared portion for fitting the three-way assembly milk outlet, and the flared portion is inclined with respect to the plugging direction so as to face the three-way assembly milk outlet in the plugging direction.

8. The breast pump as set forth in claim 1 wherein a vibrator is provided in the main unit to vibrate the tee assembly when opened.

9. The breast pump as claimed in any one of claims 1 to 8 wherein the suction cylinder housing comprises a cylinder housing and a cylinder cover housing which is clamped with the cylinder housing, the cylinder cover housing is provided with the vent, the periphery of the suction piston is squeezed between the cylinder housing and the cylinder cover housing, and the middle part of the suction piston can be protruded towards the low pressure side to make the cavity on the low pressure side smaller and the cavity on the high pressure side larger.

10. The breast pump as set forth in claim 9 wherein the cover shell is snap-fitted to the peripheral edge of the body shell by three sets of evenly distributed snap-fit clips and tabs.