Close-fitting breast pump

Abstract

The utility model provides a close-fitting breast pump, which relates to the technical field of breast pumps and comprises a negative pressure device, a feeding bottle, a rigid three-way assembly and a flexible double-layer horn cover. The three-way assembly comprises a funnel-shaped milk inlet, a negative pressure opening and a milk bottle connecting opening; the negative pressure port is fixed with a negative pressure device; the feeding bottle connector is fixed with the feeding bottle; the double-layer horn cover comprises a funnel-shaped attaching fixing layer and a funnel-shaped negative pressure positioning layer. A small funnel opening of the attaching and fixing layer is hermetically connected with a small funnel opening of the negative pressure positioning layer; the large funnel opening of the attaching fixing layer and the large funnel opening of the negative pressure positioning layer face the same direction; a gap is reserved between the funnel outer wall of the attaching and fixing layer and the funnel inner wall of the negative pressure positioning layer; and the funnel inner wall of the milk inlet is attached and fixed to the funnel outer wall of the negative pressure positioning layer. According to the breast pump tightly attached to the breast pump, the problem that the breast pump is prone to air leakage in the using process is solved, the air tightness of connection between the breast pump and the breast can be enhanced, and therefore air leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of breast pumps, specifically a breast pump with a tight fit. Background Art

[0002] A breast pump is a commonly used tool for lactating mothers. Air leakage is a common problem with breast pumps. When a breast pump leaks air, it will affect the normal operation of the breast pump, and working under air leakage conditions may cause damage to other components of the breast pump (such as at the negative pressure device that provides suction, abnormal deformation of the flexible membrane causes damage to the negative pressure device); there are many reasons for air leakage in breast pumps. One part is air leakage inside the structure of the breast pump itself, which means the breast pump is damaged and needs repair. Another part is that the breast shield of the breast pump does not fit tightly with the mother's breast normally, resulting in a gap between the breast shield and the mother's breast and air leakage.

[0003] In the prior art, such as a breast pump with a leakage detection function disclosed in Chinese Patent Application No. 202023078223.X, it provides a breast pump that can monitor whether the breast pump leaks air, thus facilitating the mother to detect whether the breast pump is assembled incorrectly or is damaged and needs repair.

[0004] However, the method given in the above comparative document cannot solve the problem of air leakage between the breast shield and the mother's breast. Summary of the Utility Model

[0005] In view of the above technical problems, the breast pump with a tight fit provided by the utility model can enhance the airtightness of the connection between the breast pump and the mother's breast and reduce the occurrence of air leakage.

[0006] To achieve the above object, the technical solution adopted by the utility model is as follows:

[0007] The breast pump with a tight fit provided by the utility model includes a negative pressure device, a milk bottle, a rigid three-way assembly, and a flexible double-layer breast shield; the three-way assembly includes a funnel-shaped milk inlet, a negative pressure port, and a milk bottle connection port; the negative pressure port is fixedly fitted with the negative pressure device; the milk bottle connection port is fixedly fitted with the milk bottle; the double-layer breast shield includes a funnel-shaped fitting and fixing layer and a funnel-shaped negative pressure positioning layer; the negative pressure positioning layer is arranged outside the fitting and fixing layer; the small funnel opening of the fitting and fixing layer is hermetically connected to the small funnel opening of the negative pressure positioning layer; the large funnel opening of the fitting and fixing layer and the large funnel opening of the negative pressure positioning layer face the same direction; there is a gap between the outer wall of the funnel of the fitting and fixing layer and the inner wall of the funnel of the negative pressure positioning layer; the milk inlet is arranged outside the small funnel opening of the negative pressure positioning layer; the inner wall of the funnel of the milk inlet is fixedly attached to the outer wall of the funnel of the negative pressure positioning layer.

[0008] The closely-fitting breast pump provided by the present utility model, preferably, the tee assembly is a plastic part; the double-layer breast shield is made of silicone; the tee assembly and the double-layer breast shield are integrally formed by injection molding and encapsulation.

[0009] The closely-fitting breast pump provided by the present utility model, preferably, the outer wall of the funnel of the negative pressure positioning layer is provided with a funnel-shaped groove; the shape of the groove matches the shape of the inner wall of the funnel of the milk inlet; the thickness of the groove is consistent with the wall thickness of the funnel of the milk inlet of the tee assembly; the outer wall of the funnel of the milk inlet of the tee assembly is smoothly connected with the outer wall of the funnel of the negative pressure positioning layer.

[0010] The closely-fitting breast pump provided by the present utility model, preferably, further includes a duckbill valve; the tee assembly includes a rigid fixed pipe; the upper end opening direction of the fixed pipe faces the milk inlet; the duckbill valve is hermetically fixed at the lower end opening of the fixed pipe; the outer wall of the fixed pipe seals the connection port of the pipe in the direction of the milk bottle connection port of the tee assembly; the duckbill valve is a silicone duckbill valve; the inlet of the duckbill valve is a circular tube; anti-slip stripes are arranged on the outer wall of the circular tube at the inlet of the duckbill valve; when the duckbill valve is fixed on the tee assembly, an interference fit is formed between the outer wall of the circular tube at the inlet of the duckbill valve and the inner wall of the fixed pipe.

[0011] The closely-fitting breast pump provided by the present utility model, preferably, the duckbill valve includes a circular ring-shaped fixing groove; when the duckbill valve is fixed on the tee assembly, the pipe orifice of the fixed pipe is inserted into the fixing groove with an interference fit; a force-applying plate for conveniently controlling the deformation of the fixing groove is fixed on the outer wall of the circular ring-shaped tube of the fixing groove.

[0012] The closely-fitting breast pump provided by the present utility model, preferably, the negative pressure device includes a negative pressure chamber with a sealed cavity and a connecting pipe; the connecting pipe is communicated with the sealed cavity of the negative pressure chamber; the negative pressure chamber includes a rigid fixing member and a flexible membrane; the fixing member and the flexible membrane enclose the sealed cavity of the negative pressure chamber; the connecting pipe passes through the fixing member and is fixed; the fixing member is detachably fixed to the tee assembly; when the fixing member is fixed on the tee assembly, the fixing member seals the negative pressure port of the tee assembly; the flexible membrane is located inside the tee assembly.

[0013] The above technical solution has the following advantages or beneficial effects:

[0014] The present utility model provides a breast pump with a tight fit, which relates to the technical field of breast pumps and includes a negative pressure device, a milk bottle, a rigid three-way component, and a flexible double-layer bell cover; the three-way component includes a funnel-shaped milk inlet, a negative pressure port, and a milk bottle connection port; the negative pressure port is fixedly matched with the negative pressure device; the milk bottle connection port is fixedly matched with the milk bottle; the double-layer bell cover includes a funnel-shaped fitting and fixing layer and a funnel-shaped negative pressure positioning layer; the negative pressure positioning layer is arranged outside the fitting and fixing layer; the small funnel opening of the fitting and fixing layer is hermetically connected to the small funnel opening of the negative pressure positioning layer; the large funnel opening of the fitting and fixing layer and the large funnel opening of the negative pressure positioning layer face the same direction; a gap is left between the outer wall of the funnel of the fitting and fixing layer and the inner wall of the funnel of the negative pressure positioning layer; the inner wall of the funnel of the milk inlet is abutted and fixed to the outer wall of the funnel of the negative pressure positioning layer. The breast pump with a tight fit provided by the present utility model solves the problem that the breast pump is prone to air leakage during use, can enhance the airtightness of the connection between the breast pump and the mother's breast, and reduce the occurrence of air leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the detailed description of the non-restrictive embodiments with reference to the following drawings, the present utility model and its features, shape, and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale, and the emphasis is on showing the gist of the present utility model.

[0016] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the breast pump with a tight fit provided in Embodiment 1 of the present utility model.

[0017] Figure 2 FIG. 2 is a schematic cross-sectional structure diagram of the breast pump with a tight fit provided in Embodiment 1 of the present utility model.

[0018] Figure 3 FIG. 3 is an exploded structure diagram of the double-layer bell cover of the breast pump with a tight fit provided in Embodiment 1 of the present utility model separated from the breast pump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following describes the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Therefore, the detailed description provided in the following drawings of the embodiments of the present utility model is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts belong to the protection scope of the present utility model.

[0020] Embodiment 1: When the breast pump in the prior art is in use, it is prone to air leakage. There are many reasons for air leakage, and the most important one is the air leakage caused by the lack of tight fit between the breast shield of the breast pump and the breast. To solve this problem, the tightly fitting breast pump provided in Embodiment 1 of the present utility model is as follows Figures 1 to 3 shown, and it includes a negative pressure device 1, a milk bottle 2, a rigid three-way component 3, and a flexible double-layer breast shield 4; the three-way component 3 includes a funnel-shaped milk inlet 31, a negative pressure port 32, and a milk bottle connection port 33; the negative pressure port 32 is fixedly matched with the negative pressure device 1;; the milk bottle connection port 33 is fixedly matched with the milk bottle 2; the double-layer breast shield 4 includes a funnel-shaped fitting and fixing layer 41 and a funnel-shaped negative pressure positioning layer 42; (the positional relationship between the fitting and fixing layer and the negative pressure positioning layer is the prior art. For example, a nipple protector provided in Chinese Patent Application No. 202020699514.1 discloses the connection relationship between the fitting and fixing layer and the negative pressure positioning layer); the negative pressure positioning layer 42 is arranged outside the fitting and fixing layer 41; the small funnel opening of the fitting and fixing layer 41 is hermetically connected to the small funnel opening of the negative pressure positioning layer 42; the large funnel opening of the fitting and fixing layer 41 and the large funnel opening of the negative pressure positioning layer 42 face the same direction; (the expressions of the large funnel opening and the small funnel opening are the prior art. In a fertilizer packaging machine funnel disclosed in Chinese Patent Application No. 201420632194.2, the large funnel cone opening is the large funnel opening in this embodiment, and the small funnel cone opening is the small funnel opening in this embodiment. The large funnel opening direction is along the axis of the funnel, from the small funnel opening towards the large funnel opening direction); there is a gap between the outer wall of the funnel of the fitting and fixing layer 41 and the inner wall of the funnel of the negative pressure positioning layer 42; the milk inlet 31 is arranged outside the small funnel opening of the negative pressure positioning layer 42; the inner wall of the funnel of the milk inlet 31 is abutted and fixed to the outer wall of the funnel of the negative pressure positioning layer 42.

[0021] When the breast pump with tight fit provided in Embodiment 1 of the present utility model is in use, it needs to be used in conjunction with the breast pump main body in the prior art. The mother's breast is abutted against the double-layer bell cover 4, so that the mother's nipple is aligned with the milk inlet 31. The breast pump main body makes the negative pressure device 1 work, so that the negative pressure device 1 provides negative pressure for the internal space of the rigid three-way component 3 (the internal space means that the mother's breast abuts against the double-layer bell cover 4 to block the milk inlet 31, the negative pressure device 1 blocks the negative pressure port 32, and the milk bottle 2 blocks the milk bottle connection port 33, thereby realizing a sealed internal space; the work of the negative pressure device 1 makes the air pressure in this internal space become smaller. The negative pressure device here is the prior art. For example, a milk sucking pad and a breast pump for a breast pump disclosed in Chinese Patent Application No. 202122324169.0 disclose the specific structure of the negative pressure device and its specific connection method with the three-way pipe. In this embodiment, the fixing method of the three-way pipe and the negative pressure device in the above-mentioned comparative document can be adopted). Since the air pressure inside the three-way component 3 becomes smaller, in order to maintain the air pressure balance between the mother's breast and the inside of the three-way component 3, the milk in the breast is secreted from the nipple, enters the inside of the three-way component 3, and flows through the milk bottle connection port 33 into the milk bottle 2; Compared with the prior art, in this embodiment, first, the funnel inner walls of the fitting and fixing layer 41 and the negative pressure positioning layer 42 of the flexible double-layer bell cover 4 will both be tightly attached to the breast surface, which means that when there is a gap between one of the fitting and fixing layer 41 and the negative pressure positioning layer 42 and the mother's breast, the other can still ensure the sealed abutment between the double-layer bell cover 4 and the mother's breast, thus providing an additional layer of protection against air leakage; Secondly, since the double-layer bell cover 4 is flexible as a whole (the existing bell covers are all made of flexible silicone), when the air pressure in the three-way component 3 changes, if the overall deformation degree of the double-layer bell cover 4 is large, the deformation of the negative pressure positioning layer 42 may cause the deformation of the fitting and fixing layer 41. In this embodiment, the milk inlet 31 of the rigid three-way component 3 is arranged on the funnel outer wall of the negative pressure positioning layer 42, so as to limit the deformation degree of the negative pressure positioning layer 42, so that only the large opening of the funnel of the negative pressure positioning layer 42 can deform. The fitting and fixing layer 41 arranged inside the small opening of the funnel of the negative pressure positioning layer 42 will not deform due to the overall deformation of the negative pressure positioning layer 42. Because when there is air leakage at the abutting and fixing layer 41 where it abuts against the breast, the flexible abutting and fixing layer 41 may re-abut against the mother's breast and seal after a period of air leakage. However, during this period, the negative pressure affects the negative pressure positioning layer 42, causing the negative pressure positioning layer 42 to deform, thereby driving the deformation of the abutting and fixing layer 41, causing the abutting and fixing layer 41 that re-abuts against the breast to deform again and leak air. In this embodiment, due to the rigid structure of the milk inlet 31 provided by the three-way component 3 on the outer wall of the negative pressure positioning layer 42, the position of the deformation and non-deformation of the negative pressure positioning layer 42 is limited, so as to better allow the double-layer bell cover 4 to be tightly sealed against the breast.

[0022] The breast pump with tight fit provided in Embodiment 1 of the present utility model solves the problem that the breast pump is prone to air leakage during use, can enhance the airtightness of the connection between the breast pump and the mother's breast, and reduce the occurrence of air leakage.

[0023] As a preferred solution, in this embodiment, the three-way component 3 is a plastic part; the double-layer bell cover 4 is made of silicone; the three-way component 3 and the double-layer bell cover 4 are integrally formed by injection molding and encapsulation.

[0024] As a preferred solution, in this embodiment, a funnel-shaped groove is provided on the outer wall of the funnel of the negative pressure positioning layer 42; the shape of the groove matches the shape of the inner wall of the funnel of the milk inlet 31; the thickness of the groove is the same as the wall thickness of the funnel of the milk inlet 31 of the three-way component; the outer wall of the funnel of the milk inlet of the three-way component 3 is smoothly connected to the outer wall of the funnel of the negative pressure positioning layer 42. The smooth connection between the outer wall of the funnel of the negative pressure positioning layer 42 and the milk inlet 31 of the three-way component 3 enables the outer wall of the funnel of the negative pressure positioning layer 42 without the groove and the outer wall of the funnel of the milk inlet 31 to form a common conical surface, thus avoiding the milk inlet 31 protruding on the outer wall of the negative pressure positioning layer 41 from affecting the aesthetics of the entire breast pump, and the smooth conical surface is easier to clean than the connecting surface with height difference because the smooth connection between the outer wall of the funnel of the negative pressure positioning layer 42 and the milk inlet 31 of the three-way component 3 reduces the place for dirt to accumulate.

[0025] To improve the suction effect of the breast pump, as a preferred solution, in this embodiment, it further includes a duckbill valve 5; the tee assembly 3 includes a rigid fixed tube 34; the upper end opening direction of the fixed tube 34 faces the milk inlet 31; a duckbill valve 5 is hermetically fixed at the lower end opening of the fixed tube 34; the outer wall of the fixed tube 34 seals the connection port of the pipeline in the direction of the milk bottle connection port 33 of the tee assembly 3 (the tee assembly 3 has a cavity, and this cavity has three connection ports communicating with the outside, and these three communication ports communicate with the milk inlet 31, the negative pressure port 32, and the milk bottle connection port 33 respectively); the duckbill valve 5 is a silicone duckbill valve; the inlet of the duckbill valve 5 is in a circular tube shape; anti-slip stripes 51 are provided on the outer wall of the inlet circular tube of the duckbill valve 5; when the duckbill valve 5 is fixed on the tee assembly 3, an interference fit is formed between the outer wall of the inlet circular tube of the duckbill valve 5 and the inner wall of the fixed tube 34. The duckbill valve 5 is a common one-way valve. After the milk enters the tee assembly 3, it will gather at the inlet of the duckbill valve 5, and the gravity of the milk causes the outlet of the duckbill valve 5 to open, so that the milk in the tee assembly 3 flows out through the duckbill valve 5 into the milk bottle 2; the fixed tube 34 together with the duckbill valve 5 blocks the milk bottle connection port 33 of the tee assembly 3, which can reduce the volume of gas generating negative pressure, so that the breast pump can suck less air and improve the suction effect; the duckbill valve 5 and the tee assembly 3 are fixed by interference fit. On the one hand, it ensures the airtight contact between the duckbill valve 5 and the inner wall of the fixed tube 34. On the other hand, since the silicone duckbill valve 5 is flexible, after using the breast pump, the user can pull out the original duckbill valve 5 from the fixed tube 34, which is convenient for cleaning the duckbill valve 5.

[0026] As a preferred solution, in this embodiment, the duckbill valve 5 includes a circular ring-shaped fixed groove 52; when the duckbill valve 5 is fixed on the tee assembly 3, the pipe orifice of the fixed tube 34 is inserted into the fixed groove 52 by interference fit; a force-applying plate 521 for facilitating the control of the deformation of the fixed groove 52 is fixed on the outer wall of the circular ring tube of the fixed groove 52. The fixed groove 52 can completely cover the pipe orifice of the fixed tube 34, further improving the airtightness between the duckbill valve 5 and the pipe orifice of the fixed tube 34; the force-applying plate 521 can prevent the user from directly grasping the outlet of the duckbill valve 5 to remove the duckbill valve from the fixed tube 34, because directly grasping the outlet of the duckbill valve 5 easily causes plastic deformation at the outlet of the duckbill valve 5 and damages it. (Setting a force-applying plate on the outer wall of the flexible circular ring tube to deform the flexible circular ring tube belongs to the prior art. In this embodiment, a force-applying plate 521 integrally formed with the outer wall of the circular ring tube is extended at the bottom surface of one side of the circular ring tube, that is, the bottom of the fixed groove 52, so as to expand the space for applying pressure on the outer wall of the circular ring tube, and use the force-applying plate 521 to increase the force arm, so as to facilitate the user to deform the outer wall of the circular ring tube).

[0027] As a preferred solution, in this embodiment, the negative pressure device 1 includes a negative pressure chamber 11 with a sealed cavity and a connecting pipe 12; the connecting pipe 12 communicates with the sealed cavity of the negative pressure chamber 11; the negative pressure chamber 11 includes a rigid fixing member 111 and a flexible membrane 112; the fixing member 111 and the flexible membrane 112 enclose the sealed cavity of the negative pressure chamber 11; the connecting pipe 12 passes through the fixing member 111 and is fixed (the connecting pipe 12 is hermetically connected to the fixing member 111); the fixing member 111 is detachably fixed to the tee assembly 3; when the fixing member 111 is fixed on the tee assembly 3, the fixing member 111 seals the negative pressure port 32 of the tee assembly 3; the flexible membrane 112 is located inside the tee assembly 3. An external air source (the breast pump main unit) provides suction to the inside of the negative pressure chamber 11 through a pipeline, so that the flexible membrane 112 deforms. When the external air is sucked, the flexible membrane 112 deforms towards the inside of the negative pressure chamber 11, so that the space inside the tee assembly 3 becomes larger, and the gas inside the tee assembly 3 does not increase, so the air pressure inside the tee assembly 3 becomes smaller.

[0028] In summary, the present utility model provides a breast pump with a tight fit, which relates to the technical field of breast pumps and includes a negative pressure device, a milk bottle, a rigid tee assembly, and a flexible double-layer bell cover; the tee assembly includes a funnel-shaped milk inlet, a negative pressure port, and a milk bottle connection port; the negative pressure port is fixedly matched with the negative pressure device; the milk bottle connection port is fixedly matched with the milk bottle; the double-layer bell cover includes a funnel-shaped fitting and fixing layer and a funnel-shaped negative pressure positioning layer; the negative pressure positioning layer is arranged outside the fitting and fixing layer; the small funnel opening of the fitting and fixing layer is hermetically connected to the small funnel opening of the negative pressure positioning layer; the large funnel openings of the fitting and fixing layer and the negative pressure positioning layer face the same direction; a gap is left between the outer wall of the funnel of the fitting and fixing layer and the inner wall of the funnel of the negative pressure positioning layer; the inner wall of the funnel of the milk inlet is abutted and fixed to the outer wall of the funnel of the negative pressure positioning layer. The breast pump with a tight fit provided by the present utility model solves the problem of easy air leakage during the use of the breast pump, can enhance the airtightness of the connection between the breast pump and the mother's breast, and reduce the occurrence of air leakage.

[0029] The above are only the preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the description and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A tightly fitting breast pump, comprising a negative pressure device and a feeding bottle, characterized in that: Also included are a rigid three-way assembly and a flexible double-layer horn cover; The three-way assembly includes a funnel-shaped milk inlet, a negative pressure port and a milk bottle connection port; the negative pressure port is fixedly matched with the negative pressure device; the milk bottle connection port is fixedly matched with the milk bottle; The double-layer horn cover comprises a funnel-shaped fitting fixing layer and a funnel-shaped negative pressure positioning layer; the negative pressure positioning layer is arranged on the outside of the fitting fixing layer; the small funnel opening of the fitting fixing layer is tightly connected with the small funnel opening of the negative pressure positioning layer; the large funnel opening of the fitting fixing layer is in the same direction as the large funnel opening of the negative pressure positioning layer; a gap is left between the outer wall of the funnel of the fitting fixing layer and the inner wall of the funnel of the negative pressure positioning layer; The milk inlet is arranged outside the small opening of the funnel of the negative pressure positioning layer; the inner wall of the funnel of the milk inlet is fixedly attached to the outer wall of the funnel of the negative pressure positioning layer.

2. The close-fitting breast pump according to claim 1, characterized in that: The three-way component is a plastic part; the double-layer speaker cover is silicone; the three-way component and the double-layer speaker cover are integrally formed by injection molding.

3. The close-fitting breast pump according to claim 1, characterized in that: The outer wall of the funnel of the negative pressure positioning layer is provided with a funnel-shaped groove; the shape of the groove matches the shape of the inner wall of the funnel of the milk inlet; the thickness of the groove is consistent with the thickness of the funnel wall of the milk inlet of the three-way assembly; The outer wall of the milk inlet funnel of the three-way component is smoothly connected with the outer wall of the funnel of the negative pressure positioning layer.

4. The close-fitting breast pump according to claim 1, characterized in that: It also includes a duckbill valve; the three-way assembly includes a rigid fixed tube; the upper end opening of the fixed tube is oriented toward the milk inlet; the duckbill valve is sealed and fixed at the lower end opening of the fixed tube; the outer wall of the fixed tube seals the connecting port of the pipeline of the three-way assembly in the direction of the milk bottle connection port; The duckbill valve is a silicone duckbill valve; the inlet of the duckbill valve is a circular tube; the outer wall of the inlet circular tube of the duckbill valve is provided with anti-slip stripes; When the duckbill valve is fixed on the three-way assembly, the outer wall of the inlet circular tube of the duckbill valve forms an interference fit with the inner wall of the fixed tube.

5. The close-fitting breast pump according to claim 4, characterized in that: The duckbill valve comprises a circular tubular fixing groove; when the duckbill valve is fixed on the three-way assembly, the fixed pipe orifice is inserted into the fixing groove by interference fit; The outer wall of the annular tube of the fixing groove is fixed with a lever plate which is convenient for controlling the deformation of the fixing groove.

6. The close-fitting breast pump according to claim 1, characterized in that: The negative pressure device comprises a negative pressure chamber having a sealed cavity and a connecting pipe; the connecting pipe is connected to the sealed cavity of the negative pressure chamber; The negative pressure chamber comprises a rigid fixing member and a flexible membrane; the fixing member and the flexible membrane surround a closed cavity of the negative pressure chamber; the connecting pipe is fixed through the fixing member; The fixing member is detachably fixed to the three-way assembly; when the fixing member is fixed to the three-way assembly, the fixing member seals the negative pressure port of the three-way assembly; and the flexible membrane is located in the three-way assembly.

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