Disposable expiration filter connecting device special for breathing machine

Abstract

The utility model relates to a disposable expiration filter connecting device special for a breathing machine. The connecting device comprises a connector. The connecting pipe is a disposable expiration filter; one end of the connecting pipe is connected with the connector, and the other end of the connecting pipe is connected with the disposable expiration filter. The disposable expiration filter connecting device special for the breathing machine has the advantages that after the disposable expiration filter is connected in a combined mode, the disposable expiration filter connecting device replaces a reusable expiration filter matched with an original breathing machine, on one hand, the function of breathing filtering is achieved, on the other hand, the expiration filter is made into a disposable product, and the disposable expiration filter connecting device is convenient to use. Repeated use is not needed, and the situation that a repeatedly-used expiration filter has a high ventilation resistance fault alarm rate is avoided; meanwhile, due to the disposable use, disinfection is not needed, the cost is low, the device can be used in cooperation with a Covidien breathing machine, and the market share is high.

Description

Technical Field

[0001] The utility model relates to the technical field of medical equipment, in particular to a disposable exhalation filter connecting device dedicated to a ventilator. Background Art

[0002] A ventilator is an artificial mechanical ventilation device that assists or controls the patient's spontaneous breathing movements to achieve the function of gas exchange in the lungs, thereby reducing the body's consumption and facilitating the recovery of respiratory function. Ventilators have been widely used to treat respiratory failure caused by various reasons, anesthesia respiratory management, and emergency resuscitation. Among them, the US Covidien ventilator has been widely used worldwide and has a high market share in China. However, in the clinical application of the US Covidien ventilator (including PB840, PB980 and other models), it was found that its dedicated reusable exhalation filter had a high ventilation resistance failure alarm rate.

[0003] Secondly, the exhalation filter provided by Covidien costs several thousand yuan, which is quite expensive. In order to reuse it, it needs to be sterilized repeatedly, which is very cumbersome.

[0004] Chinese patent document CN201520041050.4, application date 2015-01-21, patent name: A three-way tube for connecting a non-invasive ventilator and a nebulizer, discloses a three-way tube for connecting a non-invasive ventilator and a nebulizer, including a three-way tube, the three-way tube including a first port, a second port and a third port, the first port is connected to the output end of the non-invasive ventilator, the second port is connected to the output end of the nebulizer, and the third port is connected to the oral and nasal mask of the non-invasive ventilator; a control valve is provided at the confluence of the ports of the three-way tube, and an annular protrusion is provided at the end of the first port, and the outer diameter of the annular protrusion is consistent with the inner diameter of the pipeline of the non-invasive ventilator.

[0005] The three-way tube for connecting a non-invasive ventilator and a nebulizer in the above patent document can connect the non-invasive ventilator and the nebulizer, and provide exogenous positive end-expiratory pressure through non-invasive ventilator ventilation to improve the high inflation state of the lungs. At the same time, nebulization can increase the concentration of drugs reaching the lungs, improve the nebulization efficiency, and thus improve the patient's ability to dilate the bronchi and clear airway secretions. However, there is no corresponding disclosure of a technical solution for connecting an existing low-cost disposable expiratory filter with the expiratory filter of a Covidien ventilator to facilitate the replacement of the filter to solve the problem of high ventilation resistance fault alarm rate, reduce the product cost of the filter, and solve the problem of disinfection of the respiratory filter.

[0006] In summary, there is an urgent need for a connection device that connects an existing low-cost disposable exhalation filter to an exhalation filter of a Covidien ventilator, thereby facilitating filter replacement to solve the problem of high ventilation resistance fault alarm rate, reducing the product cost of the filter and solving the problem of sterilization of the respiratory filter. However, there is no report on such a connection device. Utility Model Content

[0007] The purpose of the utility model is to provide a connection device that connects an existing low-cost disposable exhalation filter with a disposable exhalation filter connection device of a Covidien ventilator, thereby facilitating the replacement of the filter to solve the problem of high ventilation resistance fault alarm rate, and reducing the product cost of the filter and solving the problem of disinfection of the respiratory filter.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A disposable exhalation filter connection device for a ventilator, the connection device comprising a connector; a connecting tube and a disposable exhalation filter; one end of the connecting tube is connected to the connector, and the other end is connected to the disposable exhalation filter; the connecting tube and the disposable exhalation filter are disposable; the connector comprises a connecting plate; the connecting plate is in an arc shape as a whole; a vent is arranged at the center of the connecting plate; the vent penetrates the connecting plate in the thickness direction of the connecting plate; a sealing protrusion ring is arranged on the upper top surface of the connecting plate at the outer periphery of the vent; the sealing protrusion ring protrudes outwardly relative to the upper top surface of the connecting plate; an interface pipe is arranged on the lower bottom surface of the connecting plate; the interface pipe is communicated with the vent and is integrally formed with the connecting plate; the connecting plate is provided with positioning grooves on both sides of the interface pipe; a supporting plate is arranged on the outer side of the connecting plate; the supporting plate and the connecting plate are integrally formed; the plane where the supporting plate is located is perpendicular to the plane where the connecting plate is located.

[0010] As a preferred technical solution, the connecting pipe includes a first connecting pipe, a transition connecting pipe, and a second connecting pipe; one end of the transition connecting pipe is connected to the first connecting pipe, and the other end is connected to the second connecting pipe; an installation ring is provided on the outer periphery of the transition connecting pipe; the second connecting pipe is a double-layer tubular structure.

[0011] As a preferred technical solution, the disposable exhalation filter comprises a third connecting pipe, a fourth connecting pipe, and a disposable exhalation filter body cavity; one end of the disposable exhalation filter body cavity is connected to the third connecting pipe, and the other end is connected to the fourth connecting pipe; a filter element is installed in the disposable exhalation filter body cavity.

[0012] As a preferred technical solution, the connector is made of aluminum.

[0013] As a preferred technical solution, the third connecting pipe is a double-layer pipe structure, and the third connecting pipe cooperates with the second connecting pipe of the connecting pipe.

[0014] As a preferred technical solution, limiting convex strips are provided on both sides of the supporting plate.

[0015] As a preferred technical solution, the mounting ring is an octagonal structure.

[0016] As a preferred technical solution, there are two sealing raised rings, namely an inner ring sealing raised ring and an outer ring sealing raised ring; the outward protrusion height of the outer ring sealing raised ring is greater than the outward protrusion height of the inner ring sealing raised ring.

[0017] The utility model has the advantages that:

[0018] 1. The utility model is a disposable exhalation filter connection device dedicated to a ventilator. After being combined with a disposable exhalation filter, it replaces the reusable exhalation filter of the original ventilator. On the one hand, it satisfies the function of respiratory filtration. On the other hand, the exhalation filter is made into a disposable product and does not need to be repeatedly used, thereby avoiding the high ventilation resistance fault alarm rate of the reused exhalation filter (because the existing exhalation filter is repeatedly used and needs to be disinfected, but the disinfection introduces external media, which makes the exhalation filter have a high ventilation resistance fault alarm rate); at the same time, because it is disposable, it does not need to be disinfected and the cost is low.

[0019] 2. The connector includes a connecting plate; the connecting plate is in an arc shape as a whole; a vent hole is provided at the center of the connecting plate; the vent hole penetrates the connecting plate in the thickness direction of the connecting plate. The arc-shaped connecting plate is convenient for fitting with the buckle mechanism on the ventilator; the vent hole is provided to facilitate the establishment of a ventilation channel with the ventilator.

[0020] 3. By setting a sealing raised ring, a sealed connection is established between the connecting plate and the ventilator, effectively preventing air leakage; by setting two sealing raised rings, a two-layer closed seal is achieved, and the sealing effect is good.

[0021] 4. The lower surface of the connecting plate is provided with an interface pipe; the interface pipe is connected to the vent hole and is integrally formed with the connecting plate; the connecting plate is provided with positioning grooves on both sides of the interface pipe. The effect of this design is that the interface pipe design facilitates the connection with the connecting pipe, and the positioning groove design enables the connecting plate to be accurately installed during installation, avoiding leakage caused by improper installation.

[0022] 5. A support plate is provided on the outside of the connecting plate; the support plate and the connecting plate are integrally formed; the plane where the support plate is located is perpendicular to the plane where the connecting plate is located. The effect of this design is: through the support plate design, an installation position is provided for human hands, which facilitates the installation of the connector.

[0023] 6. A connecting pipe is provided between the connector and the disposable exhalation filter. The connecting pipe makes the entire pipeline connection compact and reliable, avoiding air leakage during installation.

[0024] 7. A three-way pipe is provided on the fourth connecting pipe; the three-way pipe is connected to a water collecting cup, so that the water vapor of the breathing airflow can be collected in the entire breathing circuit, avoiding the problem of affecting the ventilation of the ventilator and generating the alarm of ventilation resistance failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 The utility model is a structural schematic diagram of a disposable exhalation filter connecting device dedicated to a respirator.

[0026] Attached Figure 2 It is a schematic diagram of the upper surface structure of the connector.

[0027] Attached Figure 3 It is a schematic diagram of the structure of the bottom surface of the connector.

[0028] Attached Figure 4 It is a schematic diagram of the structure of the connecting pipe.

[0029] Attached Figure 5 It is a schematic diagram of the structure of a disposable exhalation filter.

[0030] Attached Figure 6 It is a structural schematic diagram of a disposable exhalation filter connection device dedicated to a ventilator in the second embodiment. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the embodiments and with reference to the accompanying drawings.

[0032] The reference numerals and components involved in the drawings are as follows:

[0033] 1. Connector 11. Connector board

[0034] 12. Ventilation hole 13. Sealing raised ring

[0035] 14. Interface pipe 15. Positioning groove

[0036] 16. Support board

[0037] 2. Connecting pipe 21. First connecting pipe

[0038] 22. Second connecting pipe 23. Transition connecting pipe

[0039] 24. Mounting ring 3. Disposable exhalation filter

[0040] 31. Third takeover 32. Fourth takeover

[0041] 33. Disposable exhalation filter body cavity 4. Three-way pipe

[0042] 5. Water collection cup 6. Exhalation valve

[0043] 7. Exhalation circuit

[0044] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment 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.

[0045] To facilitate the understanding of the embodiments of the present utility model, the following will further explain and illustrate specific embodiments in conjunction with the accompanying drawings. The embodiments do not constitute a limitation on the embodiments of the present utility model.

[0046] In the description of the embodiments of the present utility model, it should be noted that the terms "first", "second", "one end", "the other end", "upper top surface", "lower bottom surface", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model; in addition, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0047] Example 1

[0048] Please refer to Figure 1 , Figure 1This is a structural schematic diagram of a disposable exhalation filter 3 connection device dedicated to a ventilator of the utility model. A disposable exhalation filter connection device dedicated to a ventilator, the connection device comprises a connector 1; a connecting tube 2, and a disposable exhalation filter 3; one end of the connecting tube 2 is connected to the connector 1, and the other end is connected to the disposable exhalation filter 3; the connecting tube 2 and the disposable exhalation filter 3 are disposable.

[0049] Please refer to Figure 2 , Figure 2 Schematic diagram of the upper surface structure of the connector 1. Figure 3 It is a structural schematic diagram of the lower bottom surface of the connector 1. The connector 1 comprises a connecting plate 11; the connecting plate 11 is in an arc shape as a whole; a vent hole 12 is arranged at the center of the connecting plate 11; the vent hole 12 penetrates the connecting plate 11 in the thickness direction of the connecting plate 11; a sealing protrusion ring 13 is arranged on the upper top surface of the connecting plate 11 at the outer periphery of the vent hole 12; the sealing protrusion ring protrudes outward relative to the upper top surface of the connecting plate 11; there are two sealing protrusion rings 13; an interface pipe 14 is arranged on the lower bottom surface of the connecting plate 11; the interface pipe 14 is communicated with the vent hole 12 and is integrally formed with the connecting plate 11; the connecting plate 11 is provided with positioning grooves 15 on both sides of the interface pipe 14.

[0050] A supporting plate 16 is disposed on the outer side of the connecting plate 11 ; the supporting plate 16 and the connecting plate 11 are formed in one piece; and the plane where the supporting plate 16 is located is perpendicular to the plane where the connecting plate 11 is located.

[0051] Please refer to Figure 4 , Figure 4 Schematic diagram of the structure of the connecting pipe 2. The connecting pipe 2 comprises a first connecting pipe 21, a transition connecting pipe 23, and a second connecting pipe 22; one end of the transition connecting pipe 23 is connected to the first connecting pipe 21, and the other end is connected to the second connecting pipe 22; a mounting ring 24 is provided on the outer periphery of the transition connecting pipe 23; and the second connecting pipe 32 is a double-layer tubular structure.

[0052] Please refer to Figure 5 , Figure 5 : is a schematic diagram of the structure of a disposable exhalation filter 3. The disposable exhalation filter 3 comprises a third connecting pipe 31, a fourth connecting pipe 32, and a disposable exhalation filter body cavity 33; one end of the disposable exhalation filter body cavity 33 is connected to the third connecting pipe 31, and the other end is connected to the fourth connecting pipe 32; a filter element (not shown in the figure) is installed in the disposable exhalation filter body cavity 33.

[0053] What needs to be explained in this embodiment is:

[0054] The connector 1 on the connecting device is specially designed for the structural design of the installation position of the respiratory filter in the Covidien respirator. The Covidien respirator is specially designed with a corresponding snap mechanism for the respiratory filter (the specific form of the snap mechanism can be obtained from the Covidien respirator in the prior art and will not be described here). The structure of the connector 1 of the present application is specially designed with a matching fitting mechanism for the snap mechanism, so that the connector 1 of the present application is consistent with the snap mechanism.

[0055] In the present application, a connector 1 is provided, and a targeted disposable exhalation filter 3 is provided on the connector 1, so as to replace the reusable exhalation filter of the original ventilator. On the one hand, the function of respiratory filtration is satisfied, and on the other hand, the disposable exhalation filter 3 is made into a disposable product, which does not need to be repeatedly used, thereby avoiding the high ventilation resistance fault alarm rate of the reused exhalation filter (because the existing exhalation filter is repeatedly used and needs to be disinfected, but the disinfection introduces external media, which makes the reusable exhalation filter have a high ventilation resistance fault alarm rate); at the same time, because it is disposable, it does not need to be disinfected, and the cost is low.

[0056] The connector 1 includes a connecting plate 11; the connecting plate 11 is in an arc shape as a whole; a vent hole 12 is provided at the center of the connecting plate 11; the vent hole 12 penetrates the connecting plate 11 in the thickness direction of the connecting plate 11. The arc-shaped connecting plate 11 is convenient for fitting with the buckle mechanism on the ventilator; the vent hole 12 is provided to facilitate establishing a ventilation channel with the ventilator.

[0057] The connector 1 is made of aluminum material. The effect of this design is that compared with plastic material, it has good strength and good installation stability, and compared with other iron materials, it is light and not easy to corrode.

[0058] The upper top surface of the connecting plate 11 is provided with a sealing protrusion ring 13 at the periphery of the vent 12; the sealing protrusion ring protrudes outward relative to the upper top surface of the connecting plate 11; the effect of this design is: by providing the sealing protrusion ring 13, a sealed connection is established between the connecting plate 11 and the ventilator, effectively preventing air leakage; by providing two sealing protrusion rings 13, a two-layer closed seal is achieved, and the sealing effect is good.

[0059] There are two sealing protrusion rings 13, specifically an inner ring sealing protrusion ring 13 and an outer ring sealing protrusion ring 13; the outer ring sealing protrusion ring 13 protrudes outwardly at a height greater than the inner ring sealing protrusion ring 13. The effect of this design is that through different protrusion heights, when the connector 1 is connected to the interface of the ventilator, hierarchical sealing is achieved, and the sealing performance is good.

[0060] The lower bottom surface of the connecting plate 11 is provided with an interface pipe 14; the interface pipe 14 is communicated with the vent hole 12 and is formed integrally with the connecting plate 11; the connecting plate 11 is provided with positioning grooves 15 on both sides of the interface pipe 14. The effect of this design is that the interface pipe 14 is convenient for establishing connection with the connecting pipe 2, and the positioning groove 15 is designed so that the connecting plate 11 can be accurately installed during installation, avoiding leakage caused by improper installation.

[0061] A support plate 16 is provided on the outer side of the connecting plate 11; the support plate 16 and the connecting plate 11 are integrally formed; the plane where the support plate 16 is located is perpendicular to the plane where the connecting plate 11 is located. The effect of this design is that the support plate 16 design provides an installation position for human hands, making it convenient to install the connector 1.

[0062] The supporting plate 16 is provided with limited convex strips on both sides. The limited convex strips mainly play a limiting role to prevent excessive sinking into the buckle mechanism of the ventilator.

[0063] A connecting pipe 2 is arranged between the connector 1 and the disposable exhalation filter 3. The connecting pipe 2 makes the entire pipeline connection compact and reliable, avoiding air leakage during installation.

[0064] The connecting pipe 2 includes a first connecting pipe 21, a transition connecting pipe 23, and a second connecting pipe 22; one end of the transition connecting pipe 23 is connected to the first connecting pipe 21, and the other end is connected to the second connecting pipe 22; a mounting ring 24 is provided on the periphery of the transition connecting pipe 23; and the second connecting pipe 32 is a double-layer tubular structure. The effect of this design is that the first connecting pipe 21 is used to establish a connection with the connecting plate 11, and the second connecting pipe 22 is convenient for establishing a connection with the disposable exhalation filter 3; by providing the mounting ring 24, it is convenient for manual installation and disassembly; by providing the second connecting pipe 22 with a double-layer tubular structure, it is convenient for installation with the disposable exhalation filter 3, with more contact surfaces, compact and reliable installation, and prevents air leakage.

[0065] The mounting ring 24 is an octagonal structure. The effect of this design is that the octagonal structure has a large friction contact area, which is convenient for manual operation.

[0066] The disposable exhalation filter 3 comprises a third connecting pipe 31, a fourth connecting pipe 32, and a disposable exhalation filter body cavity 33; one end of the disposable exhalation filter body cavity 33 is connected to the third connecting pipe 31, and the other end is connected to the fourth connecting pipe 32; a filter core is installed in the disposable exhalation filter body cavity 33. The effect of this design is that the design of the third connecting pipe 31 is convenient for establishing a connection with the second connecting pipe 22 of the connecting pipe 2, and the design of the fourth connecting pipe 32 is convenient for external piping; by setting the disposable exhalation filter body cavity 33 and setting the filter core in the disposable exhalation filter body cavity 33, the airflow of the ventilator is filtered.

[0067] The third connecting pipe 31 is a double-layer pipe structure, and the third connecting pipe 31 is matched with the second connecting pipe 22 of the connecting pipe 2. The effect of this design is that the connection between the disposable exhalation filter 3 and the connecting pipe 2 is established by the mutual embedding of double-layer pipes, with a large contact area, a precise fixing effect, and good sealing performance.

[0068] Example 2

[0069] Please refer to Figure 6 , Figure 6 This is a structural schematic diagram of a disposable exhalation filter connection device for a ventilator in Example 2. This embodiment is basically the same as Example 1, except that a tee pipe 4 is provided on the fourth connecting pipe 32; the tee pipe 4 is connected to a water collecting cup 5 and an exhalation pipeline 7; and the top of the sealing protrusion ring 13 on the connector 1 is connected to an exhalation valve 6.

[0070] The use principle of the disposable exhalation filter connection device dedicated to the ventilator of the utility model is: when inhaling, the exhalation valve 6 is closed; when the patient exhales, the exhalation valve 6 is opened; in the exhalation state, the airflow flows in from the exhalation pipeline 7, and then the water vapor in the exhalation is collected by the water collection cup 5, and then the airflow is filtered by the disposable exhalation filter 3, and finally flows out through the exhalation valve 6 on the connecting plate 11.

[0071] It should be noted that in this embodiment, a three-way pipe 4 is provided on the fourth connecting pipe 32; and a water collecting cup 5 is connected to the three-way pipe 4. In this way, water vapor of the respiratory airflow is collected in the entire respiratory circuit, thereby avoiding affecting the ventilation of the ventilator and generating an alarm of a ventilation resistance fault.

[0072] The utility model discloses a disposable exhalation filter connection device specially used for a ventilator, which replaces the reusable exhalation filter matched with the original ventilator. On the one hand, it satisfies the function of respiratory filtration, and on the other hand, the reusable exhalation filter is made into a disposable product, which does not need to be repeatedly used, thereby avoiding the high ventilation resistance fault alarm rate of the reusable exhalation filter (because the existing reusable exhalation filter is repeatedly used and needs to be disinfected, but the disinfection introduces external medium, which makes the exhalation filter have a high ventilation resistance fault alarm rate); at the same time, because it is disposable, it does not need to be disinfected, and the cost is low.

[0073] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the principle of the present invention. These improvements and supplements should also be regarded as the protection scope of the present invention.

Claims

1. A disposable exhalation filter connection device for a ventilator, characterized in that: The connecting device comprises a connector; a connecting tube and a disposable exhalation filter; one end of the connecting tube is connected to the connector, and the other end is connected to the disposable exhalation filter; the connecting tube and the disposable exhalation filter are disposable; the connector comprises a connecting plate; the connecting plate is arc-shaped as a whole; a vent is provided at the center of the connecting plate; the vent penetrates the connecting plate in the thickness direction of the connecting plate; a sealing protrusion ring is provided on the upper top surface of the connecting plate at the outer periphery of the vent; the sealing protrusion ring protrudes outwardly relative to the upper top surface of the connecting plate; an interface pipe is provided on the lower bottom surface of the connecting plate; the interface pipe is communicated with the vent and is integrally formed with the connecting plate; the connecting plate is provided with positioning grooves on both sides of the interface pipe; a supporting plate is provided on the outer side of the connecting plate; the supporting plate and the connecting plate are integrally formed; the plane where the supporting plate is located is perpendicular to the plane where the connecting plate is located.

2. The disposable exhalation filter connection device according to claim 1, characterized in that: The connecting pipe includes a first connecting pipe, a transition connecting pipe, and a second connecting pipe; one end of the transition connecting pipe is connected to the first connecting pipe, and the other end is connected to the second connecting pipe; a mounting ring is arranged on the outer periphery of the transition connecting pipe; the second connecting pipe is a double-layer tubular structure.

3. The disposable exhalation filter connection device according to claim 2, characterized in that: The disposable exhalation filter comprises a third connecting pipe, a fourth connecting pipe and a disposable exhalation filter body cavity; one end of the disposable exhalation filter body cavity is connected to the third connecting pipe, and the other end is connected to the fourth connecting pipe; a filter core is installed in the disposable exhalation filter body cavity.

4. The disposable exhalation filter connection device according to claim 1, characterized in that: The connector is made of aluminum material.

5. The disposable exhalation filter connection device according to claim 3, characterized in that: The third connecting pipe is a double-layer pipe structure, and the third connecting pipe matches the second connecting pipe of the connecting pipe; and the connection between the disposable exhalation filter and the connecting pipe is established by the double-layer pipes being embedded in each other.

6. The disposable exhalation filter connection device according to claim 1, characterized in that: Limiting convex strips are arranged on both sides of the supporting plate.

7. The disposable exhalation filter connection device according to claim 2, characterized in that: The mounting ring is an octagonal structure.

8. The disposable exhalation filter connection device according to claim 1, characterized in that: There are two sealing protrusion rings, specifically an inner ring sealing protrusion ring and an outer ring sealing protrusion ring; The outward protrusion height of the outer ring sealing protrusion ring is greater than the outward protrusion height of the inner ring sealing protrusion ring.

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