Vacuum deflation structure, vacuum pump assembly, and breast pump

Abstract

The application discloses a vacuum leakage structure, a vacuum pump assembly and a breast pump. The vacuum leakage structure comprises a working cavity with a leakage port, a sealing baffle shielding the leakage port, and a leakage transmission assembly driving the sealing baffle away from the leakage port. The power of the leakage transmission assembly is provided by the pressure difference between the inside and outside of the working cavity or by the pump shaft of the vacuum pump. The breast pump comprises a milk collection hood, a diaphragm, and a vacuum pump assembly. The vacuum pump is used to form a sealed chamber on the diaphragm and deform the diaphragm by vacuumizing the sealed chamber. The leakage port is communicated with the sealed chamber where the diaphragm is located through the working cavity. The sealed chamber gradually restores the shape when the leakage port is opened. The application can effectively reduce the heat generation of the breast pump during operation, improve the user's use feeling, and the design principle of the leakage transmission assembly is based on mechanical structure transmission. The structure part replaces the electromagnetic valve in the prior art, reduces the number of electric control elements of the breast pump, and effectively reduces the production cost.

Description

Technical Field

[0001] This invention relates to the field of vacuum equipment technology, and in particular to vacuum venting structures, vacuum pump assemblies, and breast pumps. Background Technology

[0002] Breast pumps are common electric appliances that use vacuum pumps to perform their functions. Currently, breast pumps on the market achieve vacuum degassing through solenoid valves. The solenoid valve is connected to the vacuum pump via an external pipeline. When the solenoid valve is closed, the vacuum pump draws air from the sealed chamber to create a vacuum, preventing external air from entering the sealed chamber through the solenoid valve. When the solenoid valve is open, the vacuum pump stops drawing vacuum, allowing external air to enter the sealed chamber through the solenoid valve.

[0003] The internal structure of existing solenoid valves mainly consists of a coil, a piston rod, and a spring. When the coil is energized, it generates a magnetic force on the piston rod. The alternating force of the magnetic force and the spring on the piston rod causes it to perform a repetitive piston movement, thus releasing air when opened and sealing when closed. This type of solenoid valve contains a coil, which generates a significant amount of heat when energized, affecting the user experience of the breast pump (especially wearable breast pumps). Furthermore, the coil's energization consumes a considerable amount of battery power, reducing the pump's runtime. Summary of the Invention

[0004] To address the shortcomings of existing technologies that use solenoid valves for venting, such as heat generation and high power consumption, this invention proposes a vacuum venting structure, a vacuum pump assembly, and a breast pump. Venting is achieved by utilizing the pressure difference between the inside and outside of the working chamber or by using the pump shaft of the vacuum pump, thereby reducing heat generation and lowering costs.

[0005] The technical solution adopted in this invention is to design a vacuum venting structure, including: a working chamber with a vent, a sealing baffle that blocks the vent, and a venting transmission assembly that pushes the sealing baffle away from the vent; the power of the venting transmission assembly is provided by the pressure difference between the inside and outside of the working chamber or by the pump shaft of the vacuum pump.

[0006] In some embodiments, the working chamber is composed of a piston chamber and a venting chamber. One end of the piston chamber is an air inlet end that connects to the external environment, and the other end is a transfer end for vacuuming. The venting transmission assembly is movably disposed in the piston chamber and forms a sealed space with the transfer end. The sealed space has an intermediate interface that connects the piston chamber and the venting chamber. The sealing baffle has a fixed part that is rotatably mounted and movable ends disposed on both sides of the fixed part. The first movable end of the sealing baffle blocks the vent, and the second movable end of the sealing baffle extends into the sealed space from the intermediate interface. The venting transmission assembly can move to contact the second movable end and rotate the sealing baffle, so that the first movable end moves away from or close to the vent.

[0007] Furthermore, the venting transmission assembly is provided with an inclined groove for accommodating the second movable end. The depth of the inclined groove gradually increases along the direction close to the transition end, and a leak-stopping surface is provided at the deepest point of the inclined groove. When the venting transmission assembly moves toward the transition end, the second movable end is lifted by the inclined groove, causing the first movable end to leave the vent. When the venting transmission assembly moves toward the air inlet end until the leak-stopping surface contacts the second movable end, the second movable end is tightened by the leak-stopping surface, causing the first movable end to block the vent.

[0008] Furthermore, the venting transmission assembly includes: a movable plug located in the piston chamber, a sealing ring disposed between the piston chamber and the movable plug, and a first elastic reset member that forces the movable plug closer to the intake end. An inclined groove is disposed on the outer wall of the movable plug, and the movable plug is pushed away from the intake end by the pressure difference between the inside and outside when the pressure in the sealed space decreases.

[0009] Furthermore, the piston chamber wall is provided with a positioning protrusion for limiting the extreme position of the movable plug. When the movable plug moves towards the air inlet end and contacts the positioning protrusion, it reaches the extreme position. The first movable end blocks the vent before the movable plug reaches or reaches the extreme position.

[0010] Furthermore, a second elastic reset element is installed inside the venting chamber to force the first movable end to seal the venting port.

[0011] Furthermore, the pump shaft of the vacuum pump rotates during vacuuming, and stops rotating when the actual pressure in the working chamber drops to the set pressure.

[0012] Furthermore, the vacuum venting structure can be installed as an end cap on the end of the vacuum pump or installed independently on the outside of the vacuum pump.

[0013] In some embodiments, the working chamber is provided with an interface for vacuuming, the venting transmission assembly is connected to the pump shaft of the vacuum pump, a third elastic reset member is installed in the working chamber to force the sealing baffle to block the vent, the venting transmission assembly is provided with a venting baffle that rotates with the pump shaft, and the venting baffle can rotate to contact the sealing baffle and push the sealing baffle away from the vent.

[0014] Furthermore, the venting transmission assembly includes: an eccentric shaft seat mounted on the pump shaft, and a venting baffle hinged at one end to the eccentric shaft seat. The other end of the venting baffle extends toward the sealing baffle to form a lever. One side of the lever is provided with a wedge-shaped portion, and one side of the sealing baffle is provided with a recessed portion that matches the shape of the wedge-shaped portion. When the venting baffle rotates forward with the pump shaft until the wedge-shaped portion inserts into the recessed portion, the sealing baffle is pushed up by the wedge-shaped portion, causing the sealing baffle to leave the vent. When the venting baffle rotates backward with the pump shaft until the venting baffle contacts the sealing baffle, the lever is blocked by the sealing baffle, causing the venting baffle to rotate and avoid the sealing baffle.

[0015] Furthermore, the working chamber is provided with limiting protrusions on both sides of the sealing baffle. The sealing baffle can only move axially along the pump shaft between the two limiting protrusions to move away from or near the vent.

[0016] Furthermore, the pump shaft of the vacuum pump reverses during vacuuming, and rotates forward when the actual pressure in the working chamber drops to the set pressure.

[0017] Furthermore, the vacuum venting structure is nested inside the vacuum pump.

[0018] The present invention also proposes a vacuum pump assembly, comprising: a vacuum pump and a vacuum venting structure, wherein the vacuum venting structure adopts the aforementioned vacuum venting structure.

[0019] The present invention also proposes a breast pump that includes the aforementioned vacuum pump assembly.

[0020] Furthermore, the breast pump also includes: a breast collection shield and a diaphragm, a vacuum pump for evacuating the sealed chamber formed by the diaphragm to deform it, and a vent that connects to the sealed chamber where the diaphragm is located through the working chamber. The sealed chamber gradually returns to its shape when the vent is opened.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. By utilizing the pressure difference between the inside and outside of the working chamber or the pump shaft of the vacuum pump to provide power for venting, the heat generated during the operation of the breast pump is effectively reduced, improving the user's comfort.

[0023] 2. The design principle of the air release transmission component is based on mechanical structure transmission. It replaces the solenoid valve in the existing technology with structural components, reduces the number of electronic control components in the breast pump, and effectively reduces production costs.

[0024] 3. It utilizes the pressure difference between the inside and outside of the working chamber to provide power for degassing, without consuming additional electrical energy, which can significantly reduce battery power consumption and greatly improve the battery life of the breast pump;

[0025] 4. The vacuum degassing structure can be nested inside the vacuum pump without the need for additional external connecting pipes, making full use of the design space, reducing the overall size of the breast pump, and making it convenient to carry and use. Attached Figure Description

[0026] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0027] Figure 1 This is a front view of the breast pump of the present invention;

[0028] Figure 2 This is a partial disassembled schematic diagram of the breast pump of the present invention;

[0029] Figure 3 This is a schematic diagram of the vacuum pump assembly in the first implementation scheme;

[0030] Figure 4 This is a schematic diagram of the vacuum venting structure assembly in the first implementation scheme;

[0031] Figure 5 This is a schematic cross-sectional view of the vacuum venting structure in the first implementation scheme;

[0032] Figure 6 This is a schematic cross-sectional view of the venting transmission assembly in the first implementation scheme;

[0033] Figure 7 This is a schematic diagram of the working process of the breast pump in the first implementation scheme;

[0034] Figure 8 This is a schematic diagram of the vacuum pump assembly according to the second implementation scheme;

[0035] Figure 9 This is a cross-sectional schematic diagram of the vacuum pump assembly in the second embodiment;

[0036] Figure 10 This is a schematic diagram showing the disassembled vacuum venting structure of the second implementation scheme;

[0037] Figure 11 This is a schematic diagram showing the disassembled vacuum venting structure of the second implementation scheme;

[0038] Figure 12 This is a schematic diagram of the working process of the breast pump according to the second implementation plan;

[0039] Reference numerals: Vacuum venting structure 100; Working chamber 1; Vent 11; Piston chamber 12; Vent chamber 13; Inlet 14; First suction port 15; Second suction port 16; Second elastic reset component 17; Adapter 18; Exhaust port 19; Spring bracket 101; Limiting protrusion 102; Sealing baffle 2; First movable end 21; Second movable end 22; Recess 23; Vent transmission assembly 3; Movable plug 31; Inclined groove 311; Leak-stopping surface 3111; Sealing ring 32; First elastic reset component 33; Vent baffle 34; Lever 341; Wedge-shaped part 3411; Eccentric shaft seat 35; Third elastic reset component 4; 200; Vacuum pump; Breast pump 300; Milk collection cover 301; Diaphragm 302; Horn cover 303; One-way valve 304. Detailed Implementation

[0040] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0041] like Figures 1 to 3 As shown, the vacuum venting structure proposed in this invention is applicable to electric appliances that use a vacuum pump to perform their work. These electric appliances include, but are not limited to, breast pumps. A breast pump 300 typically has a horn cover 303, a milk collection cover 301, a diaphragm 302, and a vacuum pump 200. The vacuum venting structure 100 is used in conjunction with the vacuum pump 200 to form a vacuum pump assembly. The vacuum pump assembly is typically installed on the upper back of the milk collection cover 301. After the vacuum pump 200 evacuates the sealed chamber where the diaphragm 302 is located, the vacuum venting structure 100 is used to vent the air, allowing the sealed chamber to return to its original shape.

[0042] like Figures 4 to 5 As shown in Figures 8 and 9, the vacuum venting structure 100 mainly comprises three parts: a working chamber 1, a sealing baffle 2, and a venting transmission assembly 3. The working chamber 1 has a vent 11, which is blocked by the sealing baffle 2. The venting transmission assembly 3 pushes the sealing baffle 2 away from the vent 11 to vent. The power of the venting transmission assembly 3 is provided by the pressure difference between the inside and outside of the working chamber 1 or by the pump shaft of the vacuum pump 200.

[0043] The following describes in detail only two feasible embodiments of the present invention.

[0044] The first implementation plan utilizes the pressure difference between the inside and outside of the working chamber to provide power for the venting transmission assembly.

[0045] The vacuum venting structure 100 is installed as an end cap on the end of the vacuum pump 200 or is installed independently on the outside of the vacuum pump 200. Figure 3 The illustration shows the vacuum venting structure 100 installed as an end cap on the end of the vacuum pump 200. The housing of the vacuum venting structure 100 has several clips that snap onto the end of the vacuum pump 200. The vacuum venting structure 100 can also be installed independently outside the vacuum pump 200. The vacuum venting structure 100 is connected to the vacuum pump 200 and the sealed chamber through an external pipeline. The design principles and structures of these two installation methods are basically the same, and will be described in detail below.

[0046] like Figure 4 , 5 As shown, the working chamber 1 consists of a piston chamber 12 and a venting chamber 13, with one end of the piston chamber 12 serving as the intake end. Figure 5 (Displayed at the right end of the piston chamber), the intake end is provided with an air inlet 14 for connecting to the external environment. The air inlet 14 can be designed as a small hole to prevent foreign objects from entering the channel. The other end of the piston chamber 12 is a transition end ( Figure 5(Displayed at the left end of the piston chamber), the adapter end is provided with two suction ports for achieving vacuuming. The first suction port 15 is connected to the vacuum pump, and the second suction port 16 is connected to the sealed chamber. The venting transmission assembly 3 is movably disposed within the piston chamber 12, and the area inside the piston chamber 12 between the venting transmission assembly 3 and the adapter end forms a sealed space. The sealed space is provided with an intermediate interface connecting the piston chamber 12 and the venting chamber 13.

[0047] The sealing baffle 2 has a fixed part and movable ends on both sides of the fixed part. In some embodiments, the sealing baffle 2 is L-shaped, with the corner portion of the sealing baffle 2 being the fixed part and the straight edge portion being the movable end. The fixed part is installed in the venting chamber 13 via a rotating shaft. Rotating either of the two movable ends will cause the sealing baffle 2 to rotate. The first movable end 21 of the sealing baffle 2 blocks the venting port 11, and the second movable end 22 of the sealing baffle 2 extends into the sealing space from the middle interface. The venting transmission assembly 3 can move to contact the second movable end 22 and rotate the sealing baffle 2, causing the first movable end 21 to move away from or near the venting port 11.

[0048] like Figure 5 , 6 As shown, the venting transmission assembly 3 is provided with a sloping groove 311 for accommodating the second movable end 22. The depth of the sloping groove 311 gradually increases towards the transition end. The deepest part of the sloping groove 311 is provided with a leak-stopping surface 3111. The slope of the sloping groove 311 affects the angle at which the sealing baffle 2 opens the vent 11. When the venting transmission assembly 3 moves towards the transition end, the depth of the sloping groove 311 contacted by the second movable end 22 gradually decreases, the second movable end 22 is lifted up, and the sealing baffle 2 rotates, causing the first movable end 21 to leave the vent 11. The closer the venting transmission assembly 3 is to the transition end, the greater the rotation angle of the sealing baffle 2, the larger the vent 11 opens, and the greater the venting volume. When the venting transmission assembly 3 moves towards the air inlet end until the leak-stopping surface 3111 contacts the second movable end 22, the second movable end 22 is tightened by the leak-stopping surface 3111, and the sealing baffle 2 rotates, causing the first movable end 21 to block the vent 11. In some embodiments, a second elastic reset member 17 is installed in the vent chamber 13 to force the first movable end 21 to block the vent port 11. The second elastic reset member 17 plays an auxiliary elastic sealing role, and a spring with very small force can be selected.

[0049] Specifically, such as Figure 6As shown, the venting transmission assembly 3 includes: a movable plug 31, a sealing ring 32, and a first elastic reset member 33. The movable plug 31 reciprocates linearly within the piston chamber 12. The sealing ring 32 is fitted onto the movable plug 31 to isolate the sealing space from the air inlet. The first elastic reset member 33 is installed within the piston chamber 12 and provides a restoring force to the movable plug 31 to force it closer to the air inlet. An inclined groove 311 is provided on the outer wall of the movable plug 31. When the pressure in the sealing space decreases, the movable plug 31 is pushed away from the air inlet by the pressure difference between the inside and outside. When the pressure in the sealing space increases, the movable plug 31 is pushed closer to the air inlet by the first elastic reset member 33. The inclined groove 311 moves with the movable plug 31, thereby achieving venting and sealing.

[0050] like Figure 5 As shown, in order to improve the reliability of the structure, the piston chamber wall is provided with a positioning protrusion 121 for limiting the extreme position of the movable plug 31. When the movable plug 31 moves towards the air inlet end and contacts the positioning protrusion 121, it reaches the extreme position. The first movable end 21 blocks the vent 11 before the movable plug 31 reaches or reaches the extreme position, ensuring that the sealing baffle 2 can be pulled tight and fit against the vent 11.

[0051] Taking the first elastic reset element 33 as an example, the spring force is calculated as follows:

[0052] According to the ISO standard Pascal (1 Pa = 1 N / m²);

[0053] According to the query, 1 standard atmosphere = 760 mmHg = 101325 Pa. The negative pressure at the suction port in the diagram can be equal to the negative pressure at the movable plug. Assuming the maximum negative pressure Max = 470 mmHg = 62661.5 Pa = 62661.5 N / m²

[0054] = 62661.5N / 106mm 2 = 0.0626615 N / mm 2 The force-bearing area of ​​the movable plug = πr 2 = 3.14×5×5mm 2 =78.5mm 2 ;

[0055] The pressure on the movable stopper 31 is 0.0626615 * 78.5 = 4.919 N = 501.6 gf, or 501.6 grams of force.

[0056] Therefore, the spring force of the first elastic reset member 33 is less than 501.6 g / L, so that when the vacuum pump 200 performs vacuuming and negative pressure is applied, atmospheric pressure can push the movable plug 31 to reach the maximum negative pressure.

[0057] It should be noted that the moving distance of the movable plug 31, the first elastic reset member 33, and the inclined groove 311 in which the movable plug 31 contacts the sealing baffle 2 can all be designed according to actual usage requirements, and the volume and shape can also be changed according to design requirements, and are not limited to the volume and shape of the above-described implementation scheme.

[0058] like Figure 7 As shown in the application example of the first implementation scheme, the working process of the breast pump is as follows:

[0059] The breast pump 300's breast collection shield 301 is in sealed contact with the breast. The control panel controls the vacuum pump 200 to operate, which evacuates the sealed chamber formed by the diaphragm 302. The diaphragm 302 deforms, causing the pressure inside the breast collection shield 301 to decrease, creating a pressure difference between the inside and outside of the breast for milk extraction. Once the pressure in the sealed chamber drops to a certain level, the movable plug 31 moves under the pressure difference, and the sealing baffle 2 rotates to open the vent 11. The pressure sensor monitors the pressure status of the sealed chamber in real time and feeds it back to the control panel. When the pressure drops to the set pressure, the control panel stops the vacuum pump 200, allowing outside air to enter the sealed chamber through the vent 11, restoring the pressure to normal. The diaphragm 302 returns to its original shape, causing the pressure inside the breast collection shield 301 to rise. With no pressure difference between the inside and outside of the breast, milk extraction stops. The movable plug 31 gradually resets as the pressure in the sealed chamber returns to normal, and the sealing baffle 2 rotates to seal the vent 11.

[0060] When in use, the vacuum venting structure 100 utilizes the pressure difference between the inside and outside of the working chamber 1 to repeatedly seal (vacuum) → vent → seal (vacuum). The entire cycle simulates the sucking and releasing motion of a baby while breastfeeding, prompting the milk to flow out of the breast.

[0061] The second implementation scheme utilizes the pump shaft of a vacuum pump to provide power to the venting drive assembly.

[0062] The vacuum venting structure 100 is nested inside the vacuum pump 200. Figure 9 The vacuum venting structure 100 inside the vacuum pump 200 is shown below in detail.

[0063] like Figure 9 , 10 As shown, the working chamber 1 is provided with an adapter 18 for vacuuming. The adapter 18 is connected to the sealed chamber. The venting transmission assembly 3 is connected to the pump shaft of the vacuum pump 200. A third elastic reset member 4 is installed in the working chamber 1 to force the sealing baffle to block the vent. The third elastic reset member 4 is fixed and positioned by the spring bracket 101. The venting transmission assembly 3 is provided with a venting baffle 34 that rotates with the pump shaft. The venting baffle 34 can rotate to contact the sealing baffle 2 and push the sealing baffle 2 away from the vent 11.

[0064] like Figure 10 , 11 As shown, the venting transmission assembly 3 includes an eccentric shaft seat 35 and a venting baffle 34. The eccentric shaft seat 35 is mounted on the pump shaft. One end of the venting baffle 34 is hinged to the eccentric shaft seat 35, and the other end of the venting baffle 34 extends toward the sealing baffle 2 to form a lever. In some embodiments, the venting baffle 34 is L-shaped, with one straight edge of the venting baffle 34 hinged to the eccentric shaft seat 35 and the other straight edge forming a lever 341. A wedge-shaped portion 3411 is provided on one side of the lever 341, and a recessed portion 23 that matches the shape of the wedge-shaped portion 3411 is provided on one side of the sealing baffle 2. When the vent baffle 34 rotates forward with the pump shaft until the wedge-shaped part 3411 inserts into the recess 23, the sealing baffle 2 is pushed up by the wedge-shaped part 3411, causing the sealing baffle 2 to leave the vent port 11 and the vent port 11 to open. After the wedge-shaped part 3411 pushes up the sealing baffle 2, it continues to rotate with the pump shaft until it leaves the sealing baffle 2. Under the action of the third elastic reset member 4, the sealing baffle 2 returns to its original position, and the vent port 11 is closed. Each time the vent baffle 34 rotates one revolution with the pump shaft, the vent port 11 is opened once. The venting time is the time it takes for the sealing baffle 2 to be lifted. When the venting baffle 34 rotates in the opposite direction with the pump shaft until it contacts the sealing baffle 2, the lever 341 is blocked by the sealing baffle 2, causing the venting baffle 34 to rotate along the hinge shaft on the eccentric shaft seat 35 to avoid the sealing baffle 2. After avoiding the sealing baffle 2, the venting baffle 34 continues to rotate with the pump shaft until it leaves the sealing baffle 2. Each time the venting baffle 34 rotates one revolution with the pump shaft, the venting baffle 34 rotates along the hinge shaft to avoid the sealing baffle 2 once, and the venting port 11 is always closed.

[0065] To prevent the sealing baffle 2 from swinging after contacting the lever 341, the working chamber 1 is provided with limiting protrusions 102 on both sides of the sealing baffle 2. The sealing baffle 2 can only move linearly between the two limiting protrusions 102 to move away from or close to the vent 11. When the lever 341 rotates in the opposite direction with the pump shaft, the sealing baffle 2 is blocked by the limiting protrusion on one side and can only be pushed away from the vent 11 by the wedge-shaped part 3411. When the lever 341 rotates in the opposite direction with the pump shaft, the sealing baffle 2 is blocked by the limiting protrusion on the other side, forcing the vent baffle 34 where the lever 341 is located to rotate and avoid it, thus ensuring the reliability of venting and sealing.

[0066] like Figure 12 As shown in the application example of the second implementation scheme, the working process of the breast pump is as follows:

[0067] The breast pump 300's breast collection shield 301 is in sealed contact with the breast. The control panel controls the vacuum pump 200 to reverse, causing the vacuum pump 200 to create a vacuum in the sealed chamber formed by the diaphragm 302. The deformation of the diaphragm 302 reduces the pressure inside the breast collection shield, creating a pressure difference between the inside and outside of the breast for milk expression. A pressure sensor monitors the pressure status of the sealed chamber in real time and feeds it back to the control panel. When the pressure drops to the set pressure, the control panel controls the vacuum pump 200 to rotate forward, intermittently opening the vent 11. When opened, external air enters the sealed chamber through the vent 11, gradually restoring the pressure in the sealed chamber to normal. The diaphragm 302 returns to its original deformation, causing the pressure inside the breast collection shield 301 to rise. With no pressure difference between the inside and outside of the breast, milk expression stops.

[0068] When in use, the vacuum venting structure 100 uses the vacuum pump 200 to repeatedly reverse (vacuum) → forward (vent) → reverse (vacuum). The entire cycle simulates the sucking and releasing motion of a baby while breastfeeding, which promotes the flow of milk from the breast.

[0069] It should be noted that the elastic reset component mentioned above can be a spring, an elastic rubber component, or an elastic alloy component, etc. Since the sealing baffle 2 needs to be fitted and sealed with the vent 11, in order to achieve a better sealing effect, the part of the sealing baffle 2 that contacts the vent 11 can be coated with rubber or a sealing gasket can be added between the two. Other sealing methods can also be used. This invention does not impose any special restrictions on this.

[0070] like Figures 1 to 3 As shown, the present invention also proposes a vacuum pump assembly, including: a vacuum pump 200 and the aforementioned vacuum venting structure 100. The breast pump 300 mentioned above includes a horn cover 303, a milk collection cover 301, a diaphragm 302, and a main unit. The main unit includes a control board, a rechargeable battery, and the vacuum pump assembly. The control board is connected to a pressure sensor. Specifically, the horn cover 303 is nested on the milk collection cover 301. The milk collection cover 301 has a groove 3011 for accommodating the diaphragm 302. The outlet end of the horn cover 303 is connected to the groove 3011. The vacuum pump 200 is used to evacuate the sealed chamber formed by the diaphragm 302 to deform it. The vent 11 is connected to the sealed chamber where the diaphragm 302 is located. The sealed chamber gradually returns to its shape when the vent 11 is opened. The bottom of the groove 3011 has a liquid outlet, which has a one-way valve 304 that only allows milk to flow out. The working process of the breast pump 300 has been described in detail above and will not be repeated here. It should be understood that the main unit can be worn inside the bra or placed outside the bra. This invention does not impose any special restrictions on the application form of the main unit.

[0071] It should be noted that the terminology used above is for describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The order of execution of actions, steps, etc., in the apparatus and methods shown in the specification and drawings can be implemented in any order unless a specific order is expressly specified, and as long as the output of a previous process is not used in a subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0072] Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vacuum dump structure comprising: The working chamber has a deflation port, a sealing baffle shielding the deflation port, and a deflation transmission assembly pushing the sealing baffle away from the deflation port; the power of the deflation transmission assembly is provided by the pressure difference between the inside and outside of the working chamber. The working chamber is composed of a piston chamber and a deflation chamber, one end of the piston chamber is an air inlet end connected to the outside environment, the other end is an adapter end for vacuumizing, the deflation transmission assembly is movably arranged in the piston chamber and forms a sealed space with the adapter end, and the sealed space is provided with an intermediate interface connecting the piston chamber and the deflation chamber. The sealing baffle has a fixed part rotatably installed and movable ends arranged on both sides of the fixed part, the first movable end of the sealing baffle shields the deflation port, and the second movable end of the sealing baffle extends into the sealed space from the intermediate interface, and the deflation transmission assembly can be moved to contact the second movable end and push the sealing baffle to rotate, so that the first movable end is away from or close to the deflation port.

2. The vacuum deflated structure of claim 1, wherein, The deflation transmission assembly is provided with a chute for accommodating the second movable end, the depth of the chute gradually deepens along the direction close to the adapter end, and the deepest part of the chute is provided with a stop surface. When the deflation transmission assembly moves towards the adapter end, the second movable end is lifted by the chute, so that the first movable end is away from the deflation port. When the deflation transmission assembly moves towards the air inlet end and the stop surface contacts the second movable end, the second movable end is pulled tight by the stop surface, so that the first movable end blocks the deflation port.

3. The vacuum-vented structure of claim 2, wherein, The deflation transmission assembly includes a movable plug in the piston chamber, a sealing ring between the piston chamber and the movable plug, and a first elastic return member forcing the movable plug to be close to the air inlet end, the chute is arranged on the outer wall of the movable plug, and the movable plug is pushed away from the air inlet end by the pressure difference between the inside and outside when the pressure in the sealed space decreases.

4. The vacuum-vented structure of claim 3, wherein, The cavity wall of the piston chamber is provided with a positioning protrusion for limiting the limit position of the movable plug, the movable plug reaches the limit position when it moves towards the air inlet end and contacts the positioning protrusion, and the first movable end blocks the deflation port before the movable plug reaches or reaches the limit position.

5. The vacuum blister of claim 1, wherein, A second elastic return member is installed in the deflation chamber to force the first movable end to block the deflation port.

6. A vacuum pump assembly comprising: A vacuum pump and a vacuum deflation structure, characterized in that the vacuum deflation structure adopts any one of the vacuum deflation structures in claims 1 to 5.

7. The vacuum pump assembly of claim 6, wherein, The pump shaft of the vacuum pump rotates during vacuumizing, and stops rotating when the actual pressure of the working chamber drops to a set pressure.

8. The vacuum pump assembly of claim 6, wherein, The vacuum deflation structure is installed as an end cover on the end of the vacuum pump or independently installed on the outside of the vacuum pump.

9. Breast pump, characterized in that The breast pump includes the vacuum pump assembly of any one of claims 6 to 8.

10. The breast pump of claim 9, wherein, The breast pump further comprises a milk collection cup and a diaphragm, the vacuum pump is used to form a sealed chamber with the diaphragm and deform it by vacuumizing the sealed chamber, the air vent is in communication with the sealed chamber where the diaphragm is located through the working chamber, and the sealed chamber gradually restores its shape when the air vent is opened.

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