A vacuum pump and a breast pump

Abstract

The utility model relates to a vacuumizing device technical field, concretely is a kind of vacuum pump and breast pump, including pump body fixed part, pump body deformation part and transmission motor, pump body deformation part can be flexible deformation, pump body deformation part is installed in pump body fixed part and forms pump body negative pressure chamber, transmission motor is equipped with transmission screw rod, pump body fixed part is equipped with check valve, vacuum pump forms negative pressure suction effect by the change of pump body negative pressure chamber internal space.The utility model adopts a kind of vacuum pump, can drive transmission screw rod by transmission motor using the mode of screw drive to drive pump body deformation part to occur deformation, to make pump body negative pressure chamber increase or shrink, using the mode of motor drive screw rod can reduce air pump operating noise, make the noise reduction when vacuumizing equipment works, air pump volume can also be reduced, it is favorable to save vacuumizing equipment internal space, reduce the volume of vacuumizing equipment.

Description

Technical Field

[0001] This utility model relates to the field of vacuum device technology, specifically a vacuum pump and a breast pump. Background Technology

[0002] A breast pump is a vacuum pump used to express accumulated breast milk from the breasts. It is generally suitable for breastfeeding mothers, especially those who wish to breastfeed but still need to work. With a breast pump, users can express breast milk at work and bring it home to feed their babies. This relieves discomfort from engorgement, increases milk production, and allows them to manage work normally. Timely expression also promotes the production of new milk. However, most existing breast pumps use diaphragm pumps or piston pumps as the air pump components for negative pressure suction. These types of pumps are large and produce relatively high decibel noise and strong vibrations during operation, negatively impacting suction effectiveness and user experience. Utility Model Content

[0003] To address the aforementioned issues of large size, high noise levels, and negative impacts on adsorption and user experience associated with existing vacuum equipment's air pumps, this invention provides the following technical solution: A vacuum pump includes a pump body fixing part, a pump body deformation part, and a drive motor. The pump body deformation part is flexibly deformable and is installed on the pump body fixing part, forming a negative pressure chamber. The drive motor is equipped with a drive screw for driving the deformation of the pump body deformation part. The pump body fixing part is equipped with a one-way valve for venting the negative pressure chamber outward. The vacuum pump creates a negative pressure suction effect by changing the internal space of the negative pressure chamber.

[0004] In the vacuum pump described above, the drive screw moves toward the negative pressure chamber of the pump body and causes the deformation part of the pump body to deform, reducing the space of the negative pressure chamber and allowing the air in the negative pressure chamber to be discharged through the one-way valve; conversely, the drive screw moves away from the negative pressure chamber of the pump body and causes the deformation part of the pump body to deform, increasing the space of the negative pressure chamber and creating a negative pressure suction effect in the negative pressure chamber.

[0005] As described above, in a vacuum pump, the pump body fixing part has a first fastening structure for mounting the pump body deformation part, and the pump body deformation part has a second fastening structure for fitting into the first fastening structure. One of the first fastening structure and the second fastening structure is a protruding structure, and the other of the first fastening structure and the second fastening structure is a groove structure.

[0006] As described above, in a vacuum pump, the pump body fixing part gradually narrows from the outside to the inside in the direction of extension of the transmission screw to form a limiting abutment part for limiting the maximum extension position of the transmission screw, and the pump body negative pressure chamber is located between the limiting abutment part and the pump body deformation part.

[0007] As described above, the fixed part of the pump body is provided with a first air pipe channel and a second air pipe channel for connecting the negative pressure chamber of the pump body to the outside. The first air pipe channel is used to connect to the external air circuit structure, and the second air pipe channel is used to install the one-way valve.

[0008] As described above, in a vacuum pump, the drive motor is an external rotor motor with a hollow through-structure. The drive end of the drive screw is installed in the hollow position of the drive motor through a threaded connection. The drive motor drives the drive screw to move axially through threaded transmission.

[0009] As described above, in a vacuum pump, the extended end of the transmission screw is provided with a clamping part for driving the pump body deformation part. The clamping part includes a first clamping layer, a clamping middle part, and a second clamping layer arranged sequentially from the outside to the inside along the axial direction. The pump body deformation part includes a clamping hole for the clamping middle part to be inserted. The outer diameter of the clamping middle part is smaller than the outer diameter of the first clamping layer and the outer diameter of the second clamping layer, respectively.

[0010] As described above, in a vacuum pump, a transmission sleeve is provided between the drive motor and the drive screw to facilitate the transfer of transmission. The transmission sleeve is installed in the hollow position of the drive motor. The transmission sleeve has a hollow through structure and an internal thread in its hollow position. The drive end of the drive screw has an external thread that mates with the internal thread of the transmission sleeve.

[0011] A breast pump includes a housing having a negative pressure chamber, a vacuum pump is installed in the housing, the vacuum pump is connected to the negative pressure chamber via an air tube, and the vacuum pump creates a negative pressure suction effect by changing the internal space of the negative pressure chamber.

[0012] As described above, the breast pump further includes a breast shield with a breast suction channel, the breast shield being detachably connected to the main body housing, and a sealed negative pressure chamber being formed between the main body housing and the breast shield; the breast suction channel has a soft deformation part near the negative pressure chamber, and when the negative pressure chamber generates negative pressure, the soft deformation part deforms and generates a negative pressure suction effect on the breast suction channel.

[0013] The beneficial effects of this utility model are as follows: 1. This utility model employs a vacuum pump that uses a drive motor to drive a drive screw via a threaded transmission, causing deformation of the pump body's deformation section. This deformation increases or decreases the negative pressure chamber of the pump body. During exhaust, the drive screw reduces the space of the negative pressure chamber through the pump body's deformation section, and air is discharged through a one-way valve. During suction, the drive screw increases the space of the negative pressure chamber through the pump body's deformation section, creating a negative pressure suction effect. Using a motor-driven screw reduces the operating noise of the air pump, thus reducing noise during vacuum equipment operation. It also reduces the size of the air pump, saving internal space and reducing the overall size of the vacuum equipment.

[0014] 2. This utility model applies a vacuum pump to a breast pump. The use of a motor-driven screw reduces operating noise and makes the overall operation quieter. Compared with the air pump components of traditional breast pumps, the vacuum pump has a simpler structure and a smaller assembly size. Its application in portable, hands-free breast pumps helps reduce the weight of the breast pump and increase milk storage capacity. The gentle suction effect of the vacuum pump also improves the user experience and makes it more convenient for users to use. Attached Figure Description

[0015] Figure 1 This is a perspective view of a vacuum pump and breast pump according to the present invention.

[0016] Figure 2 This is an internal structural diagram of a vacuum pump and breast pump according to the present invention.

[0017] Figure 3 This is a three-dimensional exploded view of a vacuum pump and breast pump according to the present invention.

[0018] Figure 4 This is a schematic diagram of the vacuum pump of this utility model in use (suction state).

[0019] Figure 5 This is a schematic diagram of the use of a vacuum pump according to the present invention (exhaust state).

[0020] Figure 6 for Figure 4 A magnified view of A.

[0021] Figure 7 for Figure 4 A magnified view of B. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] Example 1 This embodiment provides a vacuum pump.

[0026] Figures 3 to 7 A vacuum pump is shown, including a pump body fixing part 41, a pump body deformation part 42, and a drive motor 43. The pump body deformation part 42 is flexibly deformable and is installed on the pump body fixing part 41, forming a pump body negative pressure chamber 40 together with the pump body fixing part 41. The drive motor 43 is equipped with a drive screw 44 for driving the pump body deformation part 42 to deform. The pump body fixing part 41 is equipped with a one-way valve 46 for venting the pump body negative pressure chamber 40 outward. The vacuum pump creates a negative pressure suction effect by changing the internal space of the pump body negative pressure chamber 40.

[0027] Specifically, in this embodiment, the vacuum pump is a device for creating a vacuum. The vacuum pump can be used in a breast pump to create a negative pressure suction effect by drawing air. It can also be used in other devices that require vacuuming, and is not limited here. The pump body fixing part 41 and the drive motor 43 are fixed components mounted on the vacuuming device. The pump body deformation part 42 is mounted near the outer side of the pump body fixing part 41 and encloses it to form a negative pressure chamber 40 for implementing negative pressure suction and exhaust. The pump body deformation part 42 is made of a flexible material that can be elastically deformed, preferably silicone or rubber. The drive motor 43 can be a hollow, through-hole external rotor DC motor. The drive screw 44 is installed in the hollow position of the drive motor 43 and is driven by the drive motor 43 to extend or retract axially along the rotation axis. The end of the drive screw 44 closest to the drive motor 43 is the drive end, and the end of the drive screw 44 furthest from the drive motor 43 is the drive end. One end of the motor 43 is an extended end. The transmission end of the transmission screw 44 can cooperate with the hollow position of the transmission motor 43 through gear transmission, linkage transmission or thread transmission to implement telescopic transmission. Preferably, thread transmission is used to cooperate with the telescopic action of the transmission screw 44. The thread transmission can be triangular thread, trapezoidal thread or ball thread. The extended end of the transmission screw 44 is installed on the pump body deformation part 42 to drive the pump body deformation part 42 to deform. The pump body deformation part 42 is used to compress the pump body negative pressure chamber 40 and discharge air to the outside through the one-way valve 46, or the pump body deformation part 42 is used to expand the pump body negative pressure chamber 40 to form a negative pressure suction effect. During exhaust, the drive motor 43 rotates forward and drives the drive screw 44 to extend axially along the rotation axis via a threaded drive. The drive screw 44 moves towards the negative pressure chamber 40 of the pump body, causing the pump body deformation part 42 to deform. The space of the negative pressure chamber 40 of the pump body decreases, and the air in the negative pressure chamber 40 of the pump body is discharged to the outside through the one-way valve 46. Figure 5 The vacuum pump shown is in the exhaust state; During suction, the drive motor 43 reverses and drives the drive screw 44 to retract axially along the axis of rotation through a threaded drive. The drive screw 44 moves away from the negative pressure chamber 40 of the pump body and causes the pump body deformation part 42 to deform, increasing the space of the negative pressure chamber 40 of the pump body. The increased space but insufficient air will create a negative pressure environment, resulting in a negative pressure suction effect in the negative pressure chamber 40 of the pump body.

[0028] Furthermore, in some embodiments, the pump body fixing part 41 has a first fastening structure 413 for mounting the pump body deformation part 42. The pump body deformation part 42 has a second fastening structure 414 for fitting into the first fastening structure 413. One of the first fastening structure 413 and the second fastening structure 414 is a protruding structure, and the other of the first fastening structure 413 and the second fastening structure 414 is a grooved structure. Specifically, the first fastening structure 413 preferably adopts an annular protruding structure to form a convex ring for the pump body deformation part 42 to fasten. The second fastening structure 414 preferably adopts an annular grooved structure to fit the convex ring fastened to the pump body fixing part 41. This assembly structure does not require additional installation accessories. The elastic deformation characteristic of the pump body deformation part 42 makes it difficult for the second fastening structure 414 to loosen or fall off when sleeved on the first fastening structure 413 due to the friction of the material. It also has good gas sealing and facilitates deformation and suction to form negative pressure.

[0029] Furthermore, in some embodiments, the pump body fixing part 41 gradually narrows from the outside to the inside in the direction of extension of the transmission screw 44 to form a limiting abutment part 415 for limiting the maximum extension position of the transmission screw 44. The narrowing position forms a concave structure with a cross-section close to a trapezoid or a tower shape. The pump body negative pressure chamber 40 is located in the concave structure between the limiting abutment part 415 and the pump body deformation part 42. The limiting abutment part 415 and the first fastening structure 413 are connected by a smooth arc surface. The pump body fixing part 41 can limit the maximum extension position of the transmission screw 44 through the limiting abutment part 415, so that the transmission screw 44 is not easy to disengage from the transmission motor 43 due to excessive extension distance, thus ensuring the smooth operation of the air pump.

[0030] Furthermore, in some embodiments, the pump body fixing part 41 is respectively provided with a first air pipe channel 411 and a second air pipe channel 412 for connecting the pump body negative pressure chamber 40 to the outside. The first air pipe channel 411 is used to connect to the external air circuit structure, and the second air pipe channel 412 is used to install the one-way valve 46. More specifically, Figure 4 and Figure 5 The pump body fixing part 41 shown extends integrally from the outside with a hollow first air pipe channel 411, which is preferably used to connect to an external air passage structure (such as a negative pressure suction chamber located inside a vacuum equipment). The pump body fixing part 41 extends integrally from the outside with a hollow second air pipe channel 412, which is preferably used to install a one-way valve 46. When suction is performed, the air in the external air passage structure (such as a negative pressure suction chamber located inside a vacuum equipment) can be drawn into the negative pressure chamber 40 of the pump body and discharged to the outside through the one-way valve 46, so that the air in the air passage structure gradually decreases and a negative pressure state is formed.

[0031] Furthermore, in some embodiments, the extended end of the transmission screw 44 is provided with a clamping portion 440 for driving the pump body deformation portion 42. The clamping portion 440 includes a first clamping layer 441, a clamping middle portion 442, and a second clamping layer 443 arranged sequentially from the outside to the inside along the axial direction. The pump body deformation portion 42 includes a clamping hole 421 for the clamping middle portion 442 to be inserted. When the transmission screw 44 moves, the first clamping layer 441 and the second clamping layer 443 of the clamping portion 440 drive the clamping hole 421 of the pump body deformation portion 42 to stretch or contract along the moving direction of the transmission screw 44, thereby changing the space of the negative pressure chamber 40 of the pump body to achieve the effect of suction or exhaust. The outer diameter of the clamping middle portion 442 is smaller than the outer diameter of the first clamping layer 441 and the outer diameter of the second clamping layer 443, respectively, so that the clamping middle portion 442 will not easily loosen or fall off after being inserted into the clamping hole 421.

[0032] During exhaust, the drive motor 43 rotates forward and drives the drive screw 44 to extend axially along the rotation axis via a threaded drive. The drive screw 44 moves towards the negative pressure chamber 40 of the pump body, and drives the clamping hole 421 of the pump body deformation part 42 towards the limit abutment part 415. The pump body deformation part 42 deforms and compresses the negative pressure chamber 40, reducing the space of the negative pressure chamber 40. The air in the negative pressure chamber 40 is then discharged to the outside through the one-way valve 46. Figure 5 The vacuum pump shown is in the exhaust state; During suction, the drive motor 43 reverses and drives the drive screw 44 to retract axially along the axis of rotation via a threaded drive. The drive screw 44 moves away from the negative pressure chamber 40 of the pump body and drives the clamping hole 421 of the pump body deformation part 42 to move away from the limiting abutment part 415. The pump body deformation part 42 deforms and expands the negative pressure chamber 40 of the pump body, resulting in an increase in the space of the negative pressure chamber 40. The increased space but insufficient air will create a negative pressure environment, so that the negative pressure chamber 40 of the pump body produces a negative pressure suction effect.

[0033] Furthermore, in some embodiments, in order to adapt to different transmission screws 44, a transmission sleeve 431 is provided between the transmission motor 43 and the transmission screw 44 to facilitate the transfer of transmission. The transmission sleeve 431 is installed in the hollow position of the transmission motor 43. The transmission sleeve 431 has a hollow through structure and an internal thread in its hollow position. The transmission end of the transmission screw 44 has an external thread that mates with the internal thread of the transmission sleeve 431. By replacing the transmission sleeve 431, different outer diameters and thread parameters of the transmission screw 44 can be adapted. Assembly, maintenance or product debugging can be completed without replacing the transmission motor 43. This is beneficial for adapting to vacuum equipment with various negative pressure suction requirements. When the transmission is damaged, only the transmission sleeve 431 or the transmission screw 44 needs to be replaced, reducing the impact of damage on the transmission motor 43.

[0034] Example 2 This embodiment provides a breast pump, which includes the vacuum pump described in the embodiment.

[0035] Figures 1 to 3 A breast pump is shown, comprising a body housing 1 having a negative pressure chamber 10. A vacuum pump is installed on the body housing 1. The vacuum pump is connected to the negative pressure chamber 10 via an air pipe 45. The vacuum pump creates a negative pressure suction effect by changing the internal space of the negative pressure chamber 40.

[0036] Specifically, in this embodiment, the body shell 1 is preferably made of hard materials such as plastic or metal, and the breast pump cover 2 is preferably made of soft elastic materials such as rubber or silicone. The body shell 1 is assembled from an inner shell and an outer shell. The outer shell is used to protect the internal components of the breast pump, and the inner shell is used to install and position the internal components. The breast pump cover 2 is used to fit the user's breast skin so that the breast pump channel 21 forms a sealed space. The breast pump channel 21 of the breast pump cover 2 is connected to the milk storage container 3 located below the body shell 1. The milk pumped from the user's breast through negative pressure is stored in the milk storage chamber of the milk storage container 3. The breast pump cover 2 is detachably installed on the back of the body shell 1, and a negative pressure chamber 10 with a good airtight sealing effect is formed at the position close to the contact between the body shell 1 and the breast pump cover 2. When negative pressure suction is implemented, the drive motor 43 rotates forward, causing the drive screw 44 to move towards the negative pressure chamber 40 of the pump body, which in turn causes the pump body deformation part 42 to deform. At this time, the internal space of the negative pressure chamber 40 of the pump body decreases, and since the connected negative pressure chamber 10 of the machine body is a closed space, the air inside the negative pressure chamber 40 of the pump body can only be discharged through the one-way valve 46. Then, the drive motor 43 rotates in reverse, causing the drive screw 44 to move away from the negative pressure chamber 40 of the pump body, which in turn causes the pump body deformation part 42 to deform. 2. When deformation occurs, the internal space of the negative pressure chamber 40 of the pump body increases, and because the one-way valve 46 cannot draw in air from the outside, the negative pressure chamber 40 of the pump body forms a negative pressure state, and the air tube 45 produces the same negative pressure suction effect on the negative pressure chamber 10 of the machine body. The negative pressure suction effect produces the same negative pressure suction effect on the milk suction channel 21 through the surface of the breast shield 2, and then draws out milk from the breast skin that is in contact with the user. After the milk is drawn into the milk suction channel 21, it flows to the milk storage chamber of the milk storage container 3 for storage.

[0037] Furthermore, in some embodiments, the breast pump also includes a breast shield 2 with a breast suction channel 21. The breast shield 2 is detachably connected to the body housing 1, and a sealed negative pressure chamber 10 is formed between the body housing 1 and the breast shield 2. The breast suction channel 21 has a soft deformation part 22 near the negative pressure chamber 10. When the negative pressure chamber 10 generates negative pressure, the soft deformation part 22 deforms and generates a negative pressure suction effect on the breast suction channel 21. The soft deformation part 22 can flexibly deform according to the change of negative pressure state of the negative pressure chamber 10. The negative pressure suction effect is transmitted to the breast suction channel 21 through the characteristics of flexible deformation. When the negative pressure state disappears, the soft deformation part 22 elastically returns to its original shape for the next suction.

[0038] Furthermore, in some embodiments, the housing 1 is equipped with an independent battery 11 that powers the vacuum pump 4. The independent battery 11 enables the breast pump to be used independently for a long time without the need to connect to an external host or external power circuit. The housing 1 is equipped with a control circuit board 12 for controlling the vacuum pump 4. The control circuit board 12 allows the breast pump to easily connect the control button to the outside of the housing for the customer to operate. The control circuit board 12 can also adjust the suction efficiency and suction force of the vacuum pump 4.

[0039] Furthermore, in some embodiments, the milk storage container 3 has an annular outer buckle structure 31 at the milk storage cavity opening, which forms an outer snap-fit ​​structure from the outside to the inside. The bottom of the breast pump 2 has an annular inner buckle structure 24, which forms an inner snap-fit ​​structure from the inside to the outside. Since the breast pump 2 is made of soft and elastic material, the user can use the elasticity of the material to insert the annular outer buckle structure 31 into the annular inner buckle structure 24, so that the milk storage container 3 can be detachably installed on the breast pump 2 and stably sealed at the opening of the milk storage container 3. During the milk pumping process, it is not easy for milk to leak to the outside, ensuring the sealing effect of the milk storage. The characteristics of the soft and elastic material ensure the convenience of detachable and reinstallable installation, making it convenient for users.

[0040] Furthermore, in some embodiments, the breast pump 2 is provided with a raised sealing strip 23 at the installation position for contacting the body housing 1. The sealing strip 23 can be disposed between the soft deformation part 22 and the annular inner buckle structure 24. The sealing strip 23 protrudes from the surface of the breast pump 2 and surrounds the soft deformation part 22 to form an irregular annular structure with the ends connected. When the breast pump 2 is detachably installed on the body housing 1, the sealing strip 23 abuts against the surface of the body housing 1, so that the negative pressure chamber 10 of the body housing forms a sealed space. The friction generated by the sealing strip 23 abutting against the body housing 1 makes the connection position more stable. The annular sealing strip 23 ensures the airtightness of the connection position.

[0041] 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 vacuum pump, comprising a pump body fixing part (41), a pump body deformation part (42), and a drive motor (43), characterized in that: The pump body deformation part (42) is flexibly deformable. The pump body deformation part (42) is installed on the pump body fixing part (41) and surrounds the pump body fixing part (41) to form a pump body negative pressure chamber (40). The drive motor (43) is equipped with a drive screw (44) for driving the pump body deformation part (42) to deform. The pump body fixing part (41) is equipped with a one-way valve (46) for venting the pump body negative pressure chamber (40) outward. The vacuum pump forms a negative pressure suction effect by changing the internal space of the pump body negative pressure chamber (40).

2. The vacuum pump as described in claim 1, characterized in that: The drive screw (44) moves toward the direction close to the negative pressure chamber (40) of the pump body and causes the deformation part (42) of the pump body to deform, the space of the negative pressure chamber (40) of the pump body decreases, and the air in the negative pressure chamber (40) of the pump body is discharged through the one-way valve (46); the drive screw (44) moves away from the negative pressure chamber (40) of the pump body and causes the deformation part (42) of the pump body to deform, the space of the negative pressure chamber (40) of the pump body increases, so that the negative pressure chamber (40) of the pump body produces a negative pressure suction effect.

3. A vacuum pump as described in claim 1, characterized in that: The pump body fixing part (41) has a first fastening structure (413), which is used to install the pump body deformation part (42). The pump body deformation part (42) has a second fastening structure (414) for fitting and installing on the first fastening structure (413). One of the first fastening structure (413) and the second fastening structure (414) is a protruding structure, and the other of the first fastening structure (413) and the second fastening structure (414) is a groove structure.

4. A vacuum pump as described in claim 3, characterized in that: The pump body fixing part (41) gradually narrows from the outside to the inside in the direction of the extension of the transmission screw (44) to form a limiting abutment part (415) for limiting the maximum extension position of the transmission screw (44). The pump body negative pressure chamber (40) is located between the limiting abutment part (415) and the pump body deformation part (42).

5. A vacuum pump as described in claim 1, characterized in that: The pump body fixing part (41) is provided with a first air pipe channel (411) and a second air pipe channel (412) for connecting the negative pressure chamber (40) of the pump body to the outside. The first air pipe channel (411) is used to connect to the external air circuit structure, and the second air pipe channel (412) is used to install the one-way valve (46).

6. A vacuum pump as described in claim 1, characterized in that: The drive motor (43) is an external rotor motor with a hollow through structure. The drive end of the drive screw (44) is installed in the hollow position of the drive motor (43) by means of threaded engagement. The drive motor (43) drives the drive screw (44) to move axially by means of threaded transmission.

7. A vacuum pump as described in claim 6, characterized in that: The extended end of the transmission screw (44) is provided with a clamping part (440) for driving the pump body deformation part (42). The clamping part (440) includes a first clamping layer (441), a clamping middle part (442) and a second clamping layer (443) arranged sequentially from the outside to the inside along the axial direction. The pump body deformation part (42) includes a clamping hole (421) for the clamping middle part (442) to be inserted. The outer diameter of the clamping middle part (442) is smaller than the outer diameter of the first clamping layer (441) and the outer diameter of the second clamping layer (443).

8. A vacuum pump as described in claim 6, characterized in that: A transmission sleeve (431) is provided between the transmission motor (43) and the transmission screw (44) to facilitate the transfer of transmission. The transmission sleeve (431) is installed in the hollow position of the transmission motor (43). The transmission sleeve (431) has a hollow through structure and an internal thread in its hollow position. The transmission end of the transmission screw (44) is provided with an external thread that mates with the internal thread of the transmission sleeve (431).

9. A breast pump, characterized in that: The breast pump includes a housing (1) having a negative pressure chamber (10), the housing (1) being equipped with a vacuum pump as described in any one of claims 1-8, the vacuum pump being connected to the negative pressure chamber (10) via an air pipe (45), the vacuum pump creating a negative pressure suction effect through changes in the internal space of the negative pressure chamber (40).

10. A breast pump as described in claim 9, characterized in that: The breast pump also includes a breast shield (2) with a breast suction channel (21). The breast shield (2) is detachably connected to the body housing (1). A closed negative pressure chamber (10) is formed between the body housing (1) and the breast shield (2). The breast suction channel (21) has a soft deformation part (22) near the negative pressure chamber (10). When the negative pressure chamber (10) generates negative pressure, the soft deformation part (22) deforms and generates a negative pressure suction effect on the breast suction channel (21).

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