Breast pump

Abstract

The utility model relates to the technical field of maternal and infant products relates to a breast pump, including air pressure cover, breast shield subassembly, be equipped with air pressure chamber in air pressure cover, breast shield subassembly includes the breast shield main part of integrative forming, the fixed support of setting in the peripheral side of breast shield main part, the breast shield main part can at least part extend into to air pressure chamber, the breast shield main part includes installation portion, and the flexible diaphragm of fitting part, the breast shield main part is connected with air pressure cover through installation portion, be equipped with sealing structure between installation portion and air pressure cover, and sealing structure is used for closing air pressure chamber. The breast shield main part can be directly connected with air pressure cover through installation portion, and the sealing structure is abutted between installation portion and air pressure cover to close the assembly gap between installation portion and air pressure cover to reach the purpose of closing air pressure chamber, and sealing structure has certain elastic pre -tension, is favorable to the connection stability between breast shield main part and air pressure cover, prevents the breast shield main part from easily loosening when the user breast -feeds.

Description

Technical Field

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

[0002] Breastfeeding typically involves the use of a breast pump, which is used in conjunction with a nursing shield. Existing nursing shields are generally multi-component structures, mainly consisting of the nursing shield and a connecting frame. During assembly, the nursing shield is first installed inside the connecting frame to form a nursing shield assembly, and then the nursing shield assembly is connected to the three-way connector of the breast pump. In other words, the nursing shield is connected to the three-way connector through the connecting frame. In daily use, the nursing shield needs to be frequently cleaned and sterilized. However, existing nursing shield assemblies require the nursing shield and connecting frame to be disassembled separately for cleaning and sterilization, and then reassembled before use, which is cumbersome.

[0003] To improve the aforementioned defects of breast pumps, some breast pump products on the market directly connect the breast pump to the connecting frame or the breast pump housing. However, the connection and sealing of the breast pump are poor, and the breast pump is prone to loosening due to the air pressure inside the breast pump during breast pumping, which affects the normal use of breast pumping and results in low breast pumping efficiency.

[0004] This utility model was proposed in response to the shortcomings of the existing technology. Utility Model Content

[0005] This invention addresses the problems mentioned above, such as the poor sealing of existing breast pumps and the tendency for them to loosen during breast pumping due to internal air pressure, which affects normal use and results in low pumping efficiency. The invention proposes a new breast pump.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] Breast pumps, including:

[0008] A pressure hood, wherein a pressure chamber is provided inside the pressure hood;

[0009] A breast shield assembly includes an integrally formed breast shield body and a fixing bracket disposed on the outer periphery of the breast shield body. At least part of the breast shield body can extend into the air pressure chamber. The breast shield body includes a mounting part, a fitting part, and a flexible diaphragm. The breast shield body is connected to the air pressure chamber through the mounting part.

[0010] A sealing structure is provided between the mounting part and the air pressure cover, and the sealing structure is used to close the air pressure chamber.

[0011] As described above, the mounting part of the breast pump includes a mounting cylinder located on the outer periphery of the breast shield body and a clamping groove located on the inner side of the mounting cylinder, the clamping groove being used to clamp the air pressure shield.

[0012] As described above, the sealing structure of the breast pump includes a first sealing connection portion connected to the mounting cylinder and extending into the clamping groove, the first sealing connection portion abutting against the air pressure cover to seal the air pressure chamber.

[0013] As described above, the first sealing connection portion of the breast pump includes a first sealing ring, and the first sealing ring is provided with at least one.

[0014] As described above, the breast pump has a plurality of first sealing rings, and each first sealing ring is evenly distributed along the axial direction of the mounting cylinder.

[0015] As described above, the sealing structure of the breast pump further includes a second sealing connection part, which is disposed on the inner side wall of the clamping groove and extends into the clamping groove. The second sealing connection part abuts against the air pressure cover to seal the air pressure chamber. The second sealing connection part includes at least one second sealing ring.

[0016] As described above, in the breast pump, the mounting cylinder extends along the axial direction of the breast shield body away from the fitting portion, and the shape of the air pressure shield relative to the insertion portion of the clamping groove is adapted to the shape of the inner wall of the mounting cylinder.

[0017] In the breast pump described above, at least a portion of the air pressure shroud has a circular or elliptical radial cross-section.

[0018] As described above, in the breast pump, the fixing bracket and the breast shield body are integrally formed, and the rigidity of the fixing bracket is greater than that of the breast shield body.

[0019] As described above, the outer wall of the fixed bracket of the breast pump has a positioning groove.

[0020] Compared with the prior art, the beneficial effects of this utility model are:

[0021] The breast shield body can be directly snapped onto the air pressure cover via the mounting part, and a sealing structure abuts against the mounting part and the air pressure cover to seal the assembly gap between them, thereby achieving the purpose of sealing the air pressure chamber, preventing air leakage, and improving the milk pumping efficiency. Furthermore, the breast shield body is integrally molded, and the sealing structure has a certain elastic pre-tightening force, which helps enhance the connection stability between the breast shield body and the air pressure cover, preventing the breast shield body from easily loosening during milk pumping, ensuring normal use of the breast pump, and improving milk pumping efficiency. A fixing bracket is located on the outer periphery of the mounting part, clamping and fixing the mounting part to one end of the air pressure cover, further enhancing the connection stability between the mounting part and the air pressure cover, preventing the breast shield body from loosening, thus ensuring normal use of the breast pump and optimizing the user experience. The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0022] Figure 1 This is a connection diagram of one embodiment of the breast shield assembly and air pressure shield of this utility model;

[0023] Figure 2 This is one embodiment of the sealing structure of the present invention. Figure 1 A schematic diagram from the A-A section angle;

[0024] Figure 3 This is one embodiment of the sealing structure of the present invention. Figure 2 A magnified diagram of part B in the image;

[0025] Figure 4 for Figure 1 Side view;

[0026] Figure 5 This is one embodiment of the air pressure hood of the present invention. Figure 4 A schematic diagram from the C-C section angle;

[0027] Figure 6 This is a connection diagram of another embodiment of the breast shield assembly and air pressure shield of this utility model;

[0028] Figure 7 This is a second embodiment of the sealing structure of this utility model. Figure 6 A magnified diagram of part D in the image;

[0029] Figure 8 This is the third embodiment of the sealing structure of this utility model. Figure 6 A magnified diagram of part D in the image;

[0030] Figure 9 This is a second embodiment of the air pressure cover of this utility model. Figure 4 A schematic diagram from the C-C section angle;

[0031] Figure 10 This is the third embodiment of the air pressure hood of this utility model. Figure 4 A schematic diagram from the C-C section angle. Detailed Implementation

[0032] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. The described embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0033] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0034] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0035] Example 1:

[0036] like Figure 1As shown in Figure 5, this utility model provides a breast pump, including an air pressure cover 1 and a breast shield assembly 2. The air pressure cover 1 has an air pressure chamber 11 inside. The breast shield assembly 2 includes an integrally formed breast shield body 21 and a fixing bracket 22 disposed on the outer periphery of the breast shield body 21. The breast shield body 21 can at least partially extend into the air pressure chamber 11. The breast shield body 21 includes a mounting part 211, a fitting part 212 and a flexible diaphragm 213. The breast shield body 21 is detachably connected to the air pressure cover 1 through the mounting part 211. A sealing structure is also provided between the mounting part 211 and the air pressure cover 1. The sealing structure is used to seal the air pressure chamber 11. In practical applications, the breast shield body 21 can be directly connected to the air pressure cover 1 via the mounting part 211. The sealing structure abuts against the mounting part 211 and the air pressure cover 1 to seal the assembly gap between them, thereby sealing the air pressure chamber 11, preventing air leakage, and improving the breast pump's pumping efficiency. Furthermore, the breast shield body 21 is integrally formed, and the sealing structure has a certain elastic pre-tightening force, which helps enhance the connection stability between the breast shield body 21 and the air pressure cover 1, preventing the breast shield body 21 from easily loosening during breast pumping and ensuring the user's safety. The breast pump can be used normally by the user, improving milk expression efficiency. The fixing bracket 22 is located on the outer periphery of the mounting part 211. The mounting part 211 is clamped and fixed to one end of the air pressure cover 1 by the fixing bracket 22, which further enhances the connection stability between the mounting part 211 and the air pressure cover 1, prevents the breast shield body 21 from loosening, and thus ensures normal use of the breast pump by the user, optimizing the user experience. In addition, the breast shield body 21 is a one-piece molded structure, which facilitates quick assembly and disassembly between the breast shield assembly 2 and the air pressure cover 1, and makes it easy for the user to clean and disinfect the breast shield body 21. In the production process, it helps to improve the assembly efficiency of the breast pump.

[0037] like Figure 1 and Figure 2As shown, specifically, the fitting part 212 and the flexible diaphragm 213 are arranged opposite to each other, and the mounting part 211 is disposed between the fitting part 212 and the flexible diaphragm 213. The breast shield body 21 can be directly engaged with the air pressure cover 1 through the mounting part 211, allowing the flexible diaphragm 213 to extend into the air pressure chamber 11. The fitting part 212 protrudes outside the air pressure cover 1, and the fitting part 212 and the flexible diaphragm 213 enclose each other to form an opening to one side. The inner cavity 20, the breast shield body 21 can be attached to the human breast through the fitting part 212, the breast can be inserted into the inner cavity 20 and form a breast suction cavity with the flexible diaphragm 213, the air pressure cover 1 can be connected to a negative pressure mechanism, the negative pressure mechanism can be manual or electric; the negative pressure mechanism generates negative pressure in the air pressure cavity 11, thereby causing the breast shield to elastically deform, so as to generate negative pressure in the breast suction cavity, and promote the breast to output breast milk in a negative pressure environment.

[0038] like Figure 2 and Figure 3 As shown, specifically, the mounting part 211 includes a mounting cylinder 2111 disposed on the outer periphery of the breast shield body 21 and a clamping groove 2112 disposed on the inner side of the mounting cylinder 2111. The mounting cylinder 2111 is connected between the fitting part 212 and the flexible diaphragm 213, and the outer periphery of the mounting cylinder 2111 and the flexible diaphragm 213 are spaced apart and opposite to each other, so that the mounting cylinder 2111 and the flexible diaphragm 213 form a clamping groove 2112 facing the air pressure cover 1. The clamping groove 2112 is used to clamp the air pressure cover 1. During assembly, the end of the air pressure cover 1 is engaged in the clamping groove 2112, and the mounting cylinder 2111 abuts against the outside of the air pressure cover 1 to fix the air pressure cover 1, thereby realizing a detachable connection between the breast shield body 21 and the air pressure cover 1. The connection structure is simple, and the breast shield body 21 is easy to assemble and disassemble.

[0039] Optional, such as Figure 3As shown, the sealing structure includes a first sealing connection portion 31 connected to the mounting cylinder 2111 and extending into the clamping groove 2112. The first sealing connection portion 31 is disposed on the inner wall of the mounting cylinder 2111, and the inner wall of the mounting cylinder 2111 forms the outer wall of the clamping groove 2112. The first sealing connection portion 31 abuts against the air pressure cover 1 to seal the air pressure chamber 11. Further optionally, the breast shield body 21 is preferably made of food-grade liquid silicone, and the first sealing connection portion 31 and the breast shield body 21 are integral. The integral molding structure gives the first sealing connection part 31 a certain elastic pre-tightening force. When the breast pump body 21 is connected to the air pressure cover 1 through the mounting cylinder 2111, the first sealing connection part 31 abuts against the air pressure cover 1 to seal the assembly gap between the mounting cylinder 2111 and the air pressure cover 1, preventing air leakage from the air pressure chamber 11 and enhancing the connection stability of the breast pump body 21. This prevents the breast pump body 21 from easily detaching from the air pressure cover 1 when the user is pumping milk, ensuring the normal use of the breast pump.

[0040] Optionally, in some embodiments, the first sealing connection portion 31 includes a first sealing ring, which is provided with one.

[0041] Optionally, in other embodiments, such as Figure 3 As shown, there are several first sealing rings, and each first sealing ring is evenly distributed along the axial direction of the mounting cylinder 2111; in order to further enhance the connection stability between the breast shield body 21 and the air pressure cover 1, prevent the breast shield body 21 from easily detaching from the air pressure cover 1 when the user is pumping milk, and ensure the normal use of the breast pump.

[0042] like Figure 5 , 9 As shown in Figure 10, specifically, the mounting cylinder 2111 extends along the axial direction of the breast shield body 21 away from the fitting portion 212, and the shape of the extension portion of the air pressure cover 1 relative to the clamping groove 2112 is adapted to the inner wall shape of the mounting cylinder 2111; so as to facilitate a tight connection between the breast shield body 21 and the air pressure cover 1.

[0043] Optionally, in some embodiments, such as Figure 5 As shown, at least a portion of the radial cross-section of the air pressure cover 1 is circular. For example, the air pressure cover 1 is provided with at least a connection port that connects to the clamping groove 2112. The radial cross-section of the connection port is circular, which is simple in structure and facilitates the processing of the air pressure cover 1 and the mounting part 211.

[0044] Optionally, in other embodiments, such as Figure 9As shown, at least a portion of the radial cross-section of the air pressure hood 1 is elliptical. For example, the air pressure hood 1 has at least an elongated elliptical connection port, which is snapped into the clamping groove 2112. Figure 9 As shown, the longitudinal outer diameter of the elongated elliptical connection port is larger than its transverse outer diameter, which helps to reduce the transverse volume of the air pressure cover 1 and provide installation space for other components (such as negative pressure pumps, connecting pipes, etc.), thereby improving the overall space utilization of the breast pump.

[0045] Optionally, in other embodiments, such as Figure 10 As shown, at least a portion of the radial cross-section of the air pressure hood 1 is elliptical. For example, the air pressure hood 1 has at least a flat elliptical connection port, which is snapped into the clamping groove 2112. Figure 10 As shown, the lateral outer diameter of the flat elliptical connection port is larger than its longitudinal outer diameter, which helps to reduce the longitudinal volume of the air pressure cover 1 and provide installation space for other components (such as negative pressure pumps, connecting pipes, etc.), thereby improving the overall space utilization of the breast pump. In addition, since the inner wall shape of the mounting cylinder 2111 is adapted to the shape of the connection port of the air pressure cover 1, the radial cross-sectional shape of at least part of the flexible diaphragm 213 can also be set as a flat ellipse. For example, the radial cross-sectional shape of the end of the flexible diaphragm 213 near the mounting part 211 can be set as a flat ellipse, which helps to increase the capacity of the flexible diaphragm 213, thereby increasing the amount of milk that the breast pump can output.

[0046] In this embodiment, the fixing bracket 22 and the breast shield body 21 are integrally formed, and the hardness of the fixing bracket 22 is greater than that of the breast shield body 21. Specifically, the fixing bracket 22 and the breast shield body 21 are formed by secondary injection molding. In the production process of the breast shield assembly 2, the fixing bracket 22 can be injection molded first, and then the breast shield body 21 can be injection molded in the fixing bracket 22. This improves the overall structural strength and stability of the breast shield assembly 2, enhances the quality of the breast shield assembly 2, reduces the assembly process of the breast shield body 21 and the fixing bracket 22 during production, improves the production efficiency of the breast shield, and reduces the cost of the breast shield assembly. The assembly of the breast shield is simple, making it easy for users to assemble and disassemble it. In practical applications, when the breast shield body 21 is snapped together with the air pressure cover 1, the fixing bracket 22 provides support for the breast shield body 21, thereby enhancing the connection stability between the breast shield body 21 and the housing, preventing the breast shield body 21 from loosening, and ensuring the normal use of the breast pump. Moreover, the fixing bracket 22 is integrally formed with the breast shield body 21, so that the fixing bracket 22 directly covers the outer periphery of the mounting part 211 and the fitting part 212, which helps to prevent the mounting part 211 from being stretched and deformed due to repeated assembly and disassembly, thereby preventing the breast shield body 21 from easily loosening when pumping milk.

[0047] In addition, such as Figure 2 As shown, the connection between the fixing bracket 22 and the breast shield body 21 is smoothly transitioned, meaning there are neither protrusions nor depressions at the connection between the fixing bracket 22 and the fitting part 212. The connection between the fixing bracket 22 and the fitting part 212 has a flat outer surface, further enhancing the aesthetics of the breast shield and optimizing the user experience. Furthermore, the portion of the fitting part 212 near the mounting part 211 can be covered by the fixing bracket 22, which helps to enhance the structural stability of the fitting part 212. When the breast shield body 21 is fitted to the human breast, the fixing bracket 22 provides a certain support for the fitting part 212, allowing the fitting part 212 to fit more closely to the human breast, which helps to improve user comfort and prevent air and liquid leakage when the breast shield body 21 is in use.

[0048] Optionally, the breast shield body 21 can be made of food-grade liquid silicone or other materials. The breast shield body 21 has an integrated structure, which makes the breast shield body 21 have a certain degree of elasticity. When in use, the fitting part 212 can be sealed to the human breast to prevent air and liquid leakage. In addition, food-grade liquid silicone is relatively soft, which helps to improve the user experience. Furthermore, liquid silicone has the characteristics of high temperature resistance and aging resistance, and can adapt to repeated washing and high temperature sterilization.

[0049] Optionally, the bracket can be made of materials such as PPSU. PPSU has the characteristics of high temperature resistance, stability, lightness and drop resistance, and can be used for multiple cleaning and high temperature disinfection, making it safe and reliable.

[0050] Further optional, such as Figure 1 and Figure 2 As shown, the outer wall of the fixed bracket 22 is provided with a positioning groove 221. In the production process of the breast shield assembly 2, the fixed bracket 22 and the breast shield body 21 are formed through two injection molding processes, that is, the fixed bracket 22 is processed first and the breast shield body 21 is processed later. Since there is a mold conversion between the two processing processes, that is, there is a mold splitting and mold closing process, the fixed bracket 22 is fixed by the positioning groove 221, which can lock the fixed bracket 22 in the mold, prevent the fixed bracket 22 from shifting or deforming, so that the mold can be closed smoothly when the mold is converted, thereby avoiding the production of burrs on the finished product of the breast shield assembly 2. Moreover, the enhanced stability of the fixed bracket 22 is beneficial to the injection molding of the breast shield body 21, thereby improving the finished product quality of the breast shield assembly 2.

[0051] Example 2:

[0052] like Figure 7As shown, the difference between Embodiment 2 and Embodiment 1 is that the sealing structure includes a second sealing connection part 32. The second sealing connection part 32 is disposed on the inner sidewall 2113 of the clamping groove 2112 and extends into the clamping groove 2112. The second sealing connection part 32 abuts against the air pressure cover 1 to seal the air pressure chamber 11. The flexible diaphragm 213 has a connecting wall at one end facing the fitting part 212. The connecting wall is part of the breast shield body 21. The connecting wall is opposite to the mounting cylinder 2111. The clamping groove 2112 is formed between the connecting wall and the mounting cylinder 2111, and the connecting wall forms the inner sidewall 2113 of the clamping groove 2112. That is, the second sealing connection part 32 and the connecting part 2113 are connected to the fitting part 212. The wall is connected and extends into the clamping groove 2112; when the breast shield body 21 is connected to the air pressure cover 1, the air pressure cover 1 is fixed in the clamping groove 2112, the mounting cylinder 2111 and the connecting wall abut against the outer wall and inner wall of the air pressure cover 1 respectively, and a second sealing connection part 32 is provided between the connecting wall and the air pressure cover 1. The second sealing connection part 32 closes the assembly gap between the breast shield body 21 and the air pressure cover 1, thereby sealing the air pressure chamber 11, preventing air leakage from the air pressure chamber 11, and enhancing the connection stability between the breast shield body 21 and the air pressure cover 1, preventing the breast shield body 21 from easily detaching from the air pressure cover 1 when the user is pumping milk, and ensuring the normal use of the breast pump. Preferably, the second sealing connection part 32 and the breast shield body 21 are integrally formed, and the second sealing connection part 32 also has a certain elastic pre-tightening force.

[0053] Preferably, in order to reduce the processing difficulty, the specific structure of the second sealing connection part 32 is the same as that of the first sealing connection part 31; optionally, in some embodiments, the second sealing connection part 32 includes a second sealing ring; optionally, in other embodiments, a plurality of second sealing rings are provided, and each second sealing ring is evenly distributed along the axial direction of the inner sidewall 2113 of the clamping groove 2112.

[0054] Example 3:

[0055] like Figure 8As shown, the difference between this embodiment 3 and the above embodiments is that the first sealing connection part 31 and the second sealing connection part 32 are respectively provided on both sides of the clamping groove 2112. That is, the mounting cylinder 2111 is provided with the first sealing connection part 21, and the inner sidewall 2113 of the clamping groove 2112 is provided with the second sealing connection part 32, so as to further improve the connection stability between the breast shield body 21 and the air pressure cover 1, effectively prevent the air pressure chamber 11 from leaking air, and prevent the breast shield body 21 from easily loosening; preferably, the first sealing connection part 31 and the second sealing connection part 32 have the same structure, which helps to reduce the processing difficulty of the breast shield body 21.

[0056] Optionally, the first sealing connection portion 31 and the second sealing connection portion 32 are respectively configured as a first sealing ring and a second sealing ring, such as... Figure 8 As shown, at least one first sealing ring and one second sealing ring are provided, and the first sealing ring and the second sealing ring are provided in a one-to-one correspondence.

[0057] The above examples are merely illustrative of the technical content of this utility model to facilitate reader understanding, but do not imply that the implementation of this utility model is limited to these embodiments. Any technical extensions or re-creations made based on this utility model are protected by this utility model. The scope of protection of this utility model is defined by the claims.

Claims

1. A breast pump, characterized in that, include: A pressure hood (1) is provided inside the pressure hood (1); The breast shield assembly (2) includes an integrally formed breast shield body (21) and a fixing bracket (22) disposed on the outer periphery of the breast shield body (21). The breast shield body (21) can at least partially extend into the air pressure chamber (11). The breast shield body (21) includes a mounting part (211), a fitting part (212), and a flexible diaphragm (213). The breast shield body (21) is connected to the air pressure cover (1) through the mounting part (211). A sealing structure is provided between the mounting part (211) and the air pressure cover (1), and the sealing structure is used to close the air pressure chamber (11).

2. The breast pump as described in claim 1, characterized in that, The mounting part (211) includes a mounting cylinder (2111) located on the outer periphery of the breast shield body (21) and a clamping groove (2112) located on the inner side of the mounting cylinder (2111). The clamping groove (2112) is used to clamp the air pressure shield (1).

3. The breast pump as described in claim 2, characterized in that, The sealing structure includes a first sealing connection part (31) that is connected to the mounting cylinder (2111) and extends into the clamping groove (2112), the first sealing connection part (31) abutting against the air pressure cover (1) to close the air pressure chamber (11).

4. The breast pump as described in claim 3, characterized in that, The first sealing connection (31) includes a first sealing ring, and the first sealing ring is provided with at least one.

5. The breast pump as described in claim 4, characterized in that, The first sealing ring is provided in a plurality of parts, and each first sealing ring is evenly distributed along the axial direction of the mounting cylinder (2111).

6. The breast pump as described in any one of claims 2-5, characterized in that, The sealing structure further includes a second sealing connection part (32), which is disposed on the inner sidewall (2113) of the clamping groove (2112) and extends into the clamping groove (2112). The second sealing connection part (32) abuts against the air pressure cover (1) to seal the air pressure chamber (11). The second sealing connection part (32) includes at least one second sealing ring.

7. The breast pump as described in claim 2, characterized in that, The mounting cylinder (2111) extends away from the fitting part (212) along the axial direction of the breast shield body (21), and the shape of the extension portion of the air pressure shield (1) relative to the groove (2112) is adapted to the shape of the inner wall of the mounting cylinder (2111).

8. The breast pump as described in claim 1 or 7, characterized in that, The air pressure shield (1) has at least a portion of a circular or elliptical radial cross section.

9. The breast pump as described in claim 1, characterized in that, The fixing bracket (22) and the breast shield body (21) are integrally formed, and the hardness of the fixing bracket (22) is greater than that of the breast shield body (21).

10. The breast pump as described in claim 1 or 9, characterized in that, The outer wall of the fixed bracket (22) is provided with a positioning groove (221).

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