Vacuum negative pressure system and vacuum sealing device

Abstract

The utility model discloses a vacuum negative pressure system and a vacuum sealing device, and the vacuum negative pressure system comprises the vacuum sealing device and a breast pump main machine; the breast pump main machine is used for being communicated with the vacuum sealing device, the vacuum sealing device comprises a one-way circulation assembly and a sealing shell, and the breast pump main machine is communicated with the sealing shell through the one-way circulation assembly so as to vacuumize the inner space of the sealing shell. According to the technical scheme, the breast pump main machine is applied to a negative pressure power source during food vacuum preservation, the problems that an existing breast pump is single in function and is idle for a long time after the lactation period of infants is finished are solved, the resource utilization rate of the breast pump main machine is improved, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of maternal and infant products, in particular to a vacuum negative pressure system and a vacuum sealing device. Background Art

[0002] Breast pumps are widely used in situations where mothers have difficulty in lactating and infants have difficulty in sucking milk, to assist in sucking milk. A breast pump generally consists of a main unit and a milk bowl. After the milk bowl is attached to the breast, the negative pressure motor in the main unit provides negative pressure to complete the sucking of milk.

[0003] The existing breast pump has a single function and is only used for sucking milk. Therefore, after the infant's breastfeeding period is over, the breast pump is in an idle state. Long-term idleness will cause the breast pump to age and waste resources. Utility Model Content

[0004] The main purpose of the utility model is to provide a vacuum negative pressure system, aiming to solve the problem that the existing breast pump has a single function and is idle for a long time after the infant's breastfeeding period ends.

[0005] To achieve the above-mentioned purpose, the vacuum negative pressure system proposed in the utility model includes a vacuum sealing device and a breast pump host; the breast pump host is used to communicate with the vacuum sealing device, the vacuum sealing device includes a one-way flow component and a sealed shell, and the breast pump host is connected to the sealed shell through the one-way flow component to evacuate the internal space of the sealed shell.

[0006] In one embodiment of the present invention, the one-way flow component includes a one-way valve, which is provided with an air inlet and an air outlet, wherein the air inlet is connected to the sealed shell, and the air outlet is connected to the breast pump host, and the one-way valve is used to allow air to flow from the air inlet to the air outlet in a one-way manner.

[0007] In one embodiment of the utility model, the one-way valve comprises a valve seat, a valve core and a sealing member;

[0008] An installation cavity with openings at both ends is formed inside the valve seat, and the openings at both ends of the installation cavity are the air outlet and the air inlet respectively. The valve core is arranged in the installation cavity, and the valve core is provided with a guide channel, and the two ends of the guide channel are respectively connected to the air outlet and the air inlet, and the sealing member is arranged in the guide channel to block or open the connection between the air inlet and the air outlet.

[0009] In one embodiment of the present utility model, the sealing member includes a spring and a sealing portion;

[0010] One end of the spring is connected to the valve core, and the other end is elastically abutted against the sealing part. A stop ring is protruded along the radial direction of the channel inner wall of the guide channel. When the breast pump host is closed, the sealing part abuts against the stop ring to block the connection between the air inlet and the air outlet. When the breast pump host is working, the sealing part is separated from the stop ring to open the connection between the air inlet and the air outlet.

[0011] In an embodiment of the present invention, a conical chamfered surface is provided on one side of the stop ring facing the sealing portion, and the sealing portion is spherical in shape. When the breast pump main unit is closed, the sealing portion fits against the conical chamfered surface.

[0012] In an embodiment of the present utility model, a sealing ring is provided between the valve core and the cavity wall of the installation cavity, and the sealing ring is tightly fitted to the valve core and the cavity wall of the installation cavity.

[0013] In one embodiment of the utility model, the one-way flow component further comprises a sealing sleeve, the end surface of the valve core facing the air inlet is flush with the end surface of the valve seat, and the sealing sleeve is sleeved on the ends of the valve core and the valve seat facing the air inlet.

[0014] In one embodiment of the utility model, the sealing shell is provided with a vacuum hole connected to the internal space, the vacuum hole is connected to the air inlet, the outer surface of the sealing shell is provided with an elastic valve sheet and a pressure block, the movable cover of the elastic valve sheet is provided on the vacuum hole to block or open the connection between the vacuum hole and the air inlet, one side of the pressure block is crimped to the elastic valve sheet, and the other side is abutted against the sealing sleeve.

[0015] In one embodiment of the utility model, the one-way flow assembly further comprises a locking cover, one end of the locking cover is provided with a buckle, one end of the locking cover is sleeved on the outside of the one-way valve, the buckle is interference fit with the one-way valve, and the other end of the locking cover is threadedly connected with the sealing housing;

[0016] And / or, a connecting pipe is protruding from one end of the one-way valve, and the connecting pipe is provided with the air outlet.

[0017] The utility model also proposes a vacuum sealing device, which includes a one-way flow component and a sealed shell. One end of the one-way flow component is connected to the sealed shell, and the other end is used to connect to an external negative pressure device to evacuate the internal space of the sealed shell.

[0018] The vacuum negative pressure system proposed in the utility model includes a vacuum sealing device and a breast pump main unit, wherein a negative pressure pump is arranged inside the breast pump main unit, and the negative pressure pump is used to provide negative pressure power when sucking milk or vacuuming the sealed shell. The sealed shell can be used to store food, and the sealed shell is connected to the breast pump main unit through a one-way circulation component to vacuum the internal space of the sealed shell, so as to store the food in a vacuum environment, thereby improving the food preservation time. At the same time, the breast pump main unit in the present application can also be used to connect a milk collector. When the infant needs to breastfeed, the milk collector and the breast pump main unit are connected for sucking milk. Therefore, the breast pump main unit can be used for sucking milk and can also be used as a negative pressure power source when food is vacuum preserved, which solves the problem that the existing breast pump has a single function and is idle for a long time after the infant's breastfeeding period ends, improves the resource utilization rate of the breast pump main unit, and extends the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of the vacuum negative pressure system of the utility model;

[0021] Figure 2 for Figure 1 Section along AA;

[0022] Figure 3 for Figure 2 A partial enlarged schematic diagram of an embodiment at point B;

[0023] Figure 4 for Figure 2 A partial enlarged schematic diagram of another embodiment at point B.

[0024] Description of Figure Numbers:

[0025]

[0026]

[0027] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. The meanings of "and / or" and "and / or" appearing in the full text are the same, both indicating that three parallel solutions are included. Taking "A and / or B as an example", it includes solution A, or solution B, or a solution that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0032] The utility model provides a vacuum negative pressure system 1.

[0033] Combination Figure 1 and Figure 2As shown, in one embodiment of the present invention, the vacuum negative pressure system 1 includes a vacuum sealing device 30 and a breast pump host 10; the breast pump host 10 is used to communicate with the vacuum sealing device 30, the vacuum sealing device 30 includes a one-way flow component and a sealed shell 32, and the breast pump host 10 is connected to the sealed shell 32 through the one-way flow component to evacuate the internal space of the sealed shell 32.

[0034] In this embodiment, the breast pump host 10 includes a shell 13 and a negative pressure pump 11. A cavity is formed inside the shell 13, and the negative pressure pump 11 is arranged in the cavity. A negative pressure connector 12 connected to the internal cavity is arranged on the outside of the shell 13. The negative pressure connector 12 is used to detachably connect the vacuum sealing device 30 to provide a vacuum-sealed negative pressure source. The sealed shell 32 in the vacuum sealing device 30 can be a sealed bag, a sealed box, a vacuum preservation box, etc., which is used to store and preserve food; the one-way circulation component has a one-way flow guide function, and the breast pump host 10 is connected to the sealed shell 32 through the one-way circulation component, thereby achieving the function of vacuuming the sealed shell 32. At the same time, the breast pump host 10 mentioned in this application can also be used to connect with a milk collector for milk extraction.

[0035] The vacuum negative pressure system 1 also includes an air tube 20. When breastfeeding is required, one end of the air tube 20 is sleeved on the negative pressure connector 12, and the other end is connected to the milk collector. The negative pressure pump 11 is turned on to achieve the function of breastfeeding. When the sealed housing 32 needs to be vacuumed, the air tube 20 is separated from the milk collector and connected to the sealed housing 32 through a one-way flow component. The negative pressure pump 11 is turned on to achieve the vacuuming of the sealed housing 32. Therefore, the vacuum negative pressure system 1 proposed in the present application solves the problem that the existing breast pump has a single function and will be idle for a long time after the infant's breastfeeding period ends, thereby improving the resource utilization rate of the breast pump host 10 and reducing the aging speed of the equipment.

[0036] Combination Figure 3 and Figure 4 As shown, in one embodiment of the utility model, the one-way circulation component includes a one-way valve 31, and the one-way valve 31 is provided with an air inlet 317 and an air outlet 316, the air inlet 317 is connected to the sealed shell 32, and the air outlet 316 is connected to the breast pump host 10, and the one-way valve 31 is used to allow the air flow to flow from the air inlet 317 to the air outlet 316 in one direction.

[0037] In this embodiment, specifically, an airflow channel is formed inside the one-way valve 31, and the airflow is unidirectionally conducted along the direction from the air inlet 317 through the airflow channel to the air outlet 316. An elastic member and a blocking member may be provided inside the one-way valve 31, and the blocking member blocks the communication between the air inlet 317 and the air outlet 316 under the elastic action of the elastic member. By providing the one-way valve 31, after the vacuuming of the sealed housing 32 by the breast pump main unit 10 is completed, after the breast pump main unit 10 and the one-way circulation component are separated, the one-way flow guiding function of the one-way valve 31 can keep the internal space of the sealed housing 32 in a vacuum sealed state, thereby improving the preservation effect of the sealed housing 32. In other embodiments, the above-mentioned effect can also be achieved by providing a vacuum hole 323 on the sealed housing 32, and providing a spring sheet on the outer surface of the sealed housing 32 to movably block the vacuum hole 323.

[0038] Please continue to refer to Figure 3 As shown, in one embodiment of the present utility model, the one-way valve 31 includes a valve seat 311, a valve core 312 and a sealing member 313;

[0039] An installation cavity with openings at both ends is formed inside the valve seat 311, and the openings at both ends of the installation cavity are the air outlet 316 and the air inlet 317 respectively. The valve core 312 is arranged in the installation cavity, and the valve core 312 is provided with a guide channel 318, and the two ends of the guide channel 318 are connected to the air outlet 316 and the air inlet 317 respectively. The sealing member 313 is arranged in the guide channel 318 to block or open the connection between the air inlet 317 and the air outlet 316.

[0040] In this embodiment, the installation cavity is adapted to the valve core 312, so that when the valve core 312 is installed in the installation cavity through the opening, the gap between the valve core 312 and the cavity wall of the installation cavity is small, so as to improve the air tightness of the one-way valve 31. The inner diameter of the guide channel 318 varies along its axial direction, so that the seal 313 is limited in the guide channel 318. For example, the shape of the guide channel 318 can be designed to be a truncated cone or composed of multiple shapes, and the seal 313 is movably arranged in the guide channel 318. The sealing member 313 may include an elastic member and a sealing portion 313b. The elastic member may be a spring 313a, rubber or other elastic member. The sealing portion 313b is tightly fitted with the inner wall of the guide channel 318 under the elastic force, thereby blocking the connection between the air inlet 317 and the air outlet 316. When the breast pump main unit 10 is turned on, the negative pressure applied to the sealing portion 313b is greater than the elastic force applied by the sealing portion 313b, so that the sealing portion 313b opens the connection between the air inlet 317 and the air outlet 316. In addition, the sealing member 313 may also be a connecting rod or a motor or other member driving and connecting the sealing portion 313b. When it is necessary to evacuate the sealed housing 32, the motor is turned on or the connecting rod is pushed, so that the sealing portion 313b opens the connection between the air inlet 317 and the air outlet 316, and then the breast pump main unit 10 is turned on to achieve the purpose of evacuation.

[0041] Please continue to refer to Figure 3 As shown, in one embodiment of the present invention, the sealing member 313 includes a spring 313a and a sealing portion 313b;

[0042] One end of the spring 313a is connected to the valve core 312, and the other end is elastically abutted against the sealing part 313b. The inner wall of the guide channel 318 is provided with a stop ring 312a along its radial direction. When the breast pump host 10 is closed, the sealing part 313b abuts against the stop ring 312a to block the connection between the air inlet 317 and the air outlet 316. When the breast pump host 10 is working, the sealing part 313b is separated from the stop ring 312a to open the connection between the air inlet 317 and the air outlet 316.

[0043] In this embodiment, the stop ring 312a is located on the side of the seal 313 away from the air outlet 316. The cross-sectional shape of the stop ring 312a is annular. The airflow enters the guide channel 318 through the air inlet 317, passes through the opening inside the stop ring 312a, and is discharged from the air outlet 316. The sealing portion 313b in this embodiment abuts against the edge of the opening of the stop ring 312a under the elastic force of the spring 313a, thereby blocking the connection between the air inlet 317 and the air outlet 316; when the breast pump host 10 is opened, under the action of negative pressure, the sealing portion 313b moves in a direction away from the stop ring 312a, thereby opening the connection between the air inlet 317 and the air outlet 316; when the breast pump host 10 is closed, the stop ring 312a abuts against the edge of the opening of the stop ring 312a under the elastic force of the spring 313a. Therefore, compared with the solution of controlling the movement of the sealing portion 313b by turning on or off the motor, the technical solution defined in this embodiment improves the convenience of the breast pump host 10 when vacuuming the sealed shell 32.

[0044] Please continue to refer to Figure 3 In one embodiment of the present invention, a conical chamfered surface is provided on one side of the stop ring 312a facing the sealing portion 313b, and the sealing portion 313b is spherical in shape. When the breast pump main unit 10 is closed, the sealing portion 313b fits the conical chamfered surface. The conical chamfered surface provided at the opening of the stop ring 312a is more closely matched with the spherical sealing portion 313b to improve the sealing effect between the vacuum hole 323 and the stop ring 312a.

[0045] Please continue to refer to Figure 3 In one embodiment of the present invention, a sealing ring 314 is provided between the valve core 312 and the cavity wall of the installation cavity, and the sealing ring 314 is tightly fitted to the valve core 312 and the cavity wall of the installation cavity.

[0046] In this embodiment, since the valve core 312 is inserted into the installation cavity provided by the valve seat 311, and the airflow flows out from the air outlet 316 after passing through the valve core 312 through the air inlet 317, the air tightness between the valve core 312 and the cavity wall of the installation cavity will affect the vacuum effect. By setting a sealing ring 314 between the valve core 312 and the cavity wall of the installation cavity, the air tightness between the two is improved. It can be understood that in this embodiment, the sealing ring 314 is set between the end of the valve core 312 and the bottom wall of the valve seat 311 with the air outlet 316, so as to improve the convenience of assembling the valve core 312 and the valve seat 311. In other embodiments, the sealing ring 314 can also be set on the outer periphery of the valve core 312.

[0047] Please continue to refer to Figure 3 In one embodiment of the utility model, the one-way flow component also includes a sealing sleeve 34, the end surface of the valve core 312 facing the air inlet 317 is flush with the end surface of the valve seat 311, and the sealing sleeve 34 is sleeved on the end of the valve core 312 and the valve seat 311 facing the air inlet 317.

[0048] In this embodiment, by arranging the sealing sleeve 34 at the ends of the valve core 312 and the valve seat 311, the sealing effect between the valve core 312 and the valve seat 311 is further improved. At the same time, it can be seen from the above embodiment that the sealing ring 314 is arranged at the end of the valve core 312 facing the gas outlet 316. Therefore, by arranging the sealing sleeve 34 at the end surface of the valve core 312 facing the gas inlet 317, and arranging the end surfaces of the valve core 312 and the valve seat 311 flush, the sealing sleeve 34 limits the valve core 312 along its axial direction, and keeps the end of the valve core 312 in close contact with the sealing ring 314, further improving the sealing effect between the valve core 312 and the valve seat 311. It can be understood that the valve seat 311 can be provided with a stopper protruding along the radial direction of the outer periphery of the end of the sealing sleeve 34, so that one end of the sealing sleeve 34 is sleeved on the stopper and the other end wraps around the end surface of the valve core 312 and the valve seat 311, thereby improving the stability of the connection between the sealing sleeve 34 and the valve seat 311 and the valve core 312.

[0049] Please continue to refer to Figure 3 In one embodiment of the utility model, the sealing shell 32 is provided with a vacuum hole 323 connected to the internal space, the vacuum hole 323 is connected to the air inlet 317, and the outer surface of the sealing shell 32 is provided with an elastic valve sheet 322 and a pressure block 321. The movable cover of the elastic valve sheet 322 is provided on the vacuum hole 323 to block or open the connection between the vacuum hole 323 and the air inlet 317. One side of the pressure block 321 is pressed against the elastic valve sheet 322, and the other side is abutted against the sealing sleeve 34.

[0050] In this embodiment, the material of the elastic valve sheet 322 can be rubber, silicone, etc. One end of the elastic valve sheet 322 is covered on the vacuum hole 323, and the other end is fixed to the surface of the sealed shell 32 by the pressing block 321. The pressing method can be ultrasonic welding, snap connection, etc., so one end of the elastic valve sheet 322 can move relative to the pressing block 321. Therefore, when the breast pump host 10 is working, under the action of negative pressure, the elastic valve sheet 322 moves in the direction away from the vacuum hole 323, thereby opening the connection between the vacuum hole 323 and the air inlet 317; when the breast pump host 10 is closed, the elastic valve sheet 322 tightly covers the vacuum hole 323 under the action of gravity and the vacuum inside the sealed shell 32, thereby improving the sealing and fresh-keeping effect of the sealed shell 32.

[0051] Please continue to refer to Figure 3 In one embodiment of the utility model, the one-way flow assembly further includes a locking cover 33, one end of the locking cover 33 is provided with a buckle 331, one end of the locking cover 33 is sleeved on the outside of the one-way valve 31, the buckle 331 and the one-way valve 31 are interference fit, and the other end of the locking cover 33 is threadedly connected to the sealing housing 32;

[0052] And / or, a connecting pipe 315 is protruded from one end of the one-way valve 31 , and the connecting pipe 315 is provided with an air outlet 316 .

[0053] In this embodiment, the sealing cover 32 is connected and fixed to the one-way valve 31 through the locking cover 33. An opening is provided at one end of the locking cover 33 provided with the buckle 331, and the one-way valve 31 passes through the opening of the locking cover 33 and is tightly matched with the buckle 331. The buckle 331 is in an L-shape, and the L-shaped buckle 331 has a long cantilever to improve the elasticity of the buckle 331, thereby facilitating the matching assembly of the locking cover 33 and the one-way valve 31. A convex block is convexly provided on the outer periphery of the one-way valve 31. When the buckle 331 and the one-way valve 31 are tightly abutted, the convex block forms a limit at the edge of the opening of the locking cover 33, thereby further improving the stability of the connection between the locking cover 33 and the one-way valve 31. At the same time, a connection portion is convexly provided on the surface of the sealing housing 32, and the connection portion of the locking cover 33 and the sealing housing 32 is threadedly connected. By tightening the connection portion of the locking cover 33 and the sealing housing 32, the pressure block 321 arranged on the surface of the sealing housing 32 is tightly abutted against the sealing sleeve 34 under the action of the locking cover 33, further improving the sealing effect between the sealing housing 32 and the one-way valve 31. In other embodiments, the sealing housing 32 and the locking cover 33 can also be connected by snapping.

[0054] When the vacuum sealing device 30 is limited or not to include a locking cover 33, the connecting tube 315 protruding from the end of the one-way valve 31 can be used to connect the trachea 20. By sleeveing ​​one end of the trachea 20 on the connecting tube 315 and connecting the other end to the negative pressure connector 12, the detachable connection between the breast pump main unit 10 and the vacuum sealing device 30 is completed, thereby improving the convenience of connecting the breast pump main unit 10 and the air outlet 316 of the vacuum sealing device 30.

[0055] The utility model also provides a vacuum sealing device 30 .

[0056] Combination Figure 3 As shown, in one embodiment of the present invention, the vacuum sealing device 30 includes a one-way circulation component and a sealed housing 32. One end of the one-way circulation component is connected to the sealed housing 32, and the other end is used to connect to an external negative pressure device to evacuate the internal space of the sealed housing 32. The one-way circulation component is used to achieve unidirectional conduction of airflow, and the sealed housing 32 is used to store fresh food, such as a vacuum fresh-keeping box, a vacuum fresh-keeping belt, etc. The external negative pressure device can be a negative pressure motor or a breast pump main unit 10, etc. The one-way circulation component is connected to the sealed housing 32, and the vacuum effect of the sealed housing 32 is achieved under the negative pressure condition provided by the negative pressure device.

[0057] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A vacuum negative pressure system, characterized in that: The vacuum negative pressure system includes a vacuum sealing device and a breast pump host; The breast pump host is used to communicate with the vacuum sealing device, which includes a one-way circulation component and a sealed shell. The breast pump host is connected to the sealed shell through the one-way circulation component to evacuate the internal space of the sealed shell.

2. The vacuum negative pressure system according to claim 1, characterized in that: The one-way flow component includes a one-way valve, which is provided with an air inlet and an air outlet. The air inlet is connected to the sealed shell, and the air outlet is connected to the breast pump host. The one-way valve is used to allow air to flow from the air inlet to the air outlet in a one-way manner.

3. The vacuum negative pressure system according to claim 2, characterized in that: The one-way valve comprises a valve seat, a valve core and a sealing member; An installation cavity with openings at both ends is formed inside the valve seat, and the openings at both ends of the installation cavity are the air outlet and the air inlet respectively. The valve core is arranged in the installation cavity, and the valve core is provided with a guide channel, and the two ends of the guide channel are respectively connected to the air outlet and the air inlet, and the sealing member is arranged in the guide channel to block or open the connection between the air inlet and the air outlet.

4. The vacuum negative pressure system according to claim 3, characterized in that: The sealing member comprises a spring and a sealing portion; One end of the spring is connected to the valve core, and the other end is elastically abutted against the sealing part. A stop ring is protruded along the radial direction of the channel inner wall of the guide channel. When the breast pump host is closed, the sealing part abuts against the stop ring to block the connection between the air inlet and the air outlet. When the breast pump host is working, the sealing part is separated from the stop ring to open the connection between the air inlet and the air outlet.

5. The vacuum negative pressure system according to claim 4, characterized in that: A conical chamfered surface is provided on one side of the stop ring facing the sealing portion. The sealing portion is spherical in shape. When the breast pump main unit is closed, the sealing portion fits the conical chamfered surface.

6. The vacuum negative pressure system according to any one of claims 3 to 5, characterized in that: A sealing ring is provided between the valve core and the cavity wall of the installation cavity, and the sealing ring is tightly fitted to the valve core and the cavity wall of the installation cavity.

7. The vacuum negative pressure system according to any one of claims 3 to 5, characterized in that: The one-way flow assembly further comprises a sealing sleeve, the end surface of the valve core facing the air inlet is flush with the end surface of the valve seat, and the sealing sleeve is sleeved on the ends of the valve core and the valve seat facing the air inlet.

8. The vacuum negative pressure system according to claim 7, characterized in that: The sealing shell is provided with a vacuum hole connected to the internal space, and the vacuum hole is connected to the air inlet. The outer surface of the sealing shell is provided with an elastic valve sheet and a pressure block. The movable cover of the elastic valve sheet is provided on the vacuum hole to block or open the connection between the vacuum hole and the air inlet. One side of the pressure block is pressed against the elastic valve sheet, and the other side is abutted against the sealing sleeve.

9. The vacuum negative pressure system according to any one of claims 2 to 5, characterized in that: The one-way flow assembly further comprises a locking cover, one end of which is provided with a buckle, one end of which is sleeved on the outside of the one-way valve, the buckle is interference-fitted with the one-way valve, and the other end of the locking cover is threadedly connected with the sealing housing; And / or, a connecting pipe is protruding from one end of the one-way valve, and the connecting pipe is provided with the air outlet.

10. A vacuum sealing device, characterized in that: The vacuum sealing device comprises a one-way flow component and a sealed shell. One end of the one-way flow component is connected to the sealed shell, and the other end is used to connect to an external negative pressure device to evacuate the internal space of the sealed shell.

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