Wound flushing device

Abstract

The utility model relates to medical instruments, in particular to a wound flushing device which comprises a pressing shell, a reset spring, a first one-way valve, a second one-way valve, a fixing assembly and a liquid pipe, the pressing shell is provided with a cavity, the pressing shell seals an opening of a container, the pressing shell is elastic, and the volume of the cavity is reduced under extrusion of external force; the first one-way valve and the second one-way valve are arranged on the pressing shell, and the first one-way valve can communicate with the cavity and the container so that gas can be discharged into the container from the cavity in a one-way mode. The second one-way valve can communicate with the cavity and the outside so that gas can enter the cavity from the outside in a one-way mode. The reset spring is arranged in the cavity and used for resetting the pressing shell to enlarge the volume of the cavity after the extrusion force borne by the pressing shell is removed. A flow channel penetrating in the length direction of the liquid pipe is arranged in the liquid pipe, one end of the liquid pipe is of a tip structure and can be inserted into the container, the other end of the liquid pipe is communicated with the outside, and the liquid pipe is connected with the container through a fixing assembly. The wound irrigator can form water flow for irrigating wounds.

Description

Technical Field

[0001] The utility model relates to the field of medical devices, in particular to a wound flushing device Background Art

[0002] For skin injuries, medical staff usually first use saline or purified water to rinse the wound and the area around the wound to clean away dust and sand near the wound, and then use hydrogen peroxide or iodine to rinse or wipe the wound.

[0003] Currently, when treating wounds, a container bottle is generally placed above the wound, and saline or hydrogen peroxide in the container bottle is poured to achieve a flushing effect. This flushing method is easily affected by hand shaking and can easily pour too much or too little medicine, and the pouring amount is difficult to control. Summary of the Invention

[0004] The embodiment of the present utility model provides a wound flushing device to solve the problem of difficult to control the pouring amount in the existing flushing method.

[0005] The present invention provides a wound irrigation device, comprising a pressing shell, a return spring, a first one-way valve, a second one-way valve, a fixing assembly, and a liquid tube. The pressing shell has a cavity, and the pressing shell can seal the opening of an external container. The pressing shell is elastic so that the volume of the cavity can be reduced under external pressure.

[0006] The first one-way valve and the second one-way valve are provided on the pressing shell, and the first one-way valve can connect the cavity and the container to allow gas to be discharged from the cavity into the container in one direction;

[0007] The second one-way valve is capable of connecting the cavity with the outside world to allow gas to enter the cavity from the outside world in one direction;

[0008] The return spring is disposed in the cavity, and is used to return the pressing shell to its original position after the external force acting on the pressing shell is released;

[0009] The liquid pipe is provided with a flow channel running through it along its length direction, the other end of the liquid pipe is connected to the outside, and the liquid pipe is connected to the container through the fixing component.

[0010] Optionally, a pressure relief valve is further included, which is arranged on the pressing shell and can connect the outside world and the container.

[0011] Optionally, the liquid tube includes a first tube and a second tube formed integrally, the first tube is connected to the second tube, the first tube has a tip for inserting into a container, the second tube is used to flush the wound, and there is a non-zero angle between the axial direction of the first tube and the axial direction of the second tube.

[0012] Optionally, a third tube is further included, which is connected to the second tube. The third tube and the second tube are detachably connected. The third tube can rotate around its own axis relative to the second tube, and there is a non-zero angle between the third tube and the second tube.

[0013] Optionally, the fixing assembly includes a rubber stopper, which can be plugged into the opening of the container. A through hole is provided in the middle of the rubber stopper, and the first tube extends into the container through the through hole.

[0014] Optionally, the fixing assembly includes a friction portion provided on an outer wall of the first tube, and the friction portion is used to increase the friction force between the first tube and the container.

[0015] Optionally, the fixing assembly further includes a back-off cone, which is arranged around the first tube, with the tip of the back-off cone facing the tip of the first tube.

[0016] Optionally, the pressing shell includes a telescopic shell, an embedded tube and a base, the cavity is provided in the telescopic shell, a first valve hole and a second valve hole are provided on the telescopic shell, the interior of the base is hollow, the valve holes communicate with the cavity and the inner cavity of the base, the embedded tube is provided on the base, one end of the embedded tube is embedded in the opening of the container, the first valve hole communicates with the embedded tube, and an air hole is provided on the side wall of the base, the air hole communicates with the inner cavity of the base and the outside;

[0017] The first tube is arranged in the embedded tube, and the second tube passes through the side wall of the embedded tube and the side wall of the base in sequence;

[0018] The first one-way valve is disposed in the first valve hole, and the second one-way valve is disposed in the second valve hole.

[0019] Optionally, the first one-way valve includes a first valve disc and a first valve body, the first valve body is provided with a first hollow area, a middle portion of the first valve disc is fixed to the first valve body, and the first valve disc is elastic so as to be able to close the first hollow area;

[0020] The second one-way valve includes a second valve disc and a second valve body; a second hollow area is provided on the second valve body, the middle part of the second valve disc is fixed on the second hollow area, and the second valve disc is elastic so that the second valve disc can close the first hollow area.

[0021] Optionally, the first valve hole and the second valve hole are connected to form a mounting hole, the first valve body and the second valve body are both plate-shaped, the first valve body and the second valve body are integrally formed to form a sealing plate, the first hollow area and the second hollow area are spaced apart on the sealing plate, the sealing plate is installed in the mounting hole, the sealing plate can close the mounting hole, the first valve plate and the second valve plate are arranged on opposite sides of the sealing plate, the first valve plate is arranged outside the cavity, and the second valve plate is arranged inside the cavity.

[0022] An embodiment of the present utility model provides a wound flushing device, which comprises placing a pressing shell above a container, inserting one end of a liquid tube into the container and placing the end below the liquid surface, aiming the other end of the liquid tube at the wound, pressing the pressing shell downward with one hand, causing the pressing shell to be compressed under pressure, and the return spring to be squeezed and compressed, causing the gas in the cavity to enter the container from a first one-way valve, and the pressing shell to close the opening of the container, increasing the pressure in the container, and causing the liquid to flow from one end of the liquid tube below the liquid surface to the other end of the liquid tube under the pressure of the gas, and after the liquid tube is no longer pressed by one hand, the return spring extends from compression to a free state, driving the pressing shell to reset, causing the cavity to gradually expand, forming a negative pressure in the cavity, and allowing external gas to enter the cavity from the second one-way valve, and after repeatedly pressing several times, a water flow can be formed to flush the wound, thereby improving the wound flushing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0024] Figure 1 This is a schematic diagram of the application of a wound flushing device in one embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the internal structure of the telescopic housing of the wound washing device in one embodiment of the present utility model;

[0026] Figure 3 This is a three-dimensional diagram of a wound irrigation device in one embodiment of the present invention;

[0027] Figure 4 This is a structural schematic diagram of a sealing plate of a wound flushing device in one embodiment of the present invention;

[0028] Figure 5 1 is a schematic diagram of the position of the wound irrigation device embedded in the tube in one embodiment of the present invention;

[0029] Figure 6This is a schematic diagram of the pressure relief of the pressure relief rod of the wound irrigation device in one embodiment of the present invention;

[0030] Figure 7 This is a structural diagram of the embedded tube and liquid tube of the wound flushing device in one embodiment of the present invention.

[0031] Figure numerals: 1. Press shell; 10. Cavity; 11. Telescopic shell; 111. Mounting hole; 12. Base; 121. Air hole; 2. Reset spring; 3. Liquid tube; 31. First tube; 32. Second tube; 33. Third tube; 4. Sealing plate; 41. First hollow area; 42. Second hollow area; 43. First valve disc; 44. Second valve disc; 5. Embedded tube; 6. Pressure relief rod; 61. Pressure relief groove; 62. Pressure spring. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the description of the present invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] Reference Figures 1 to 7, an embodiment of the present invention discloses a wound washing device, comprising a pressing shell 1, a return spring 2, a first one-way valve, a second one-way valve, a fixing assembly and a liquid tube 3, wherein the pressing shell 1 has a cavity 10, the pressing shell 1 closes the opening of the container, the pressing shell 1 is elastic, and the pressing shell 1 shrinks under external pressure, and at the same time, the volume of the cavity 10 also shrinks, and the gas pressure in the cavity decreases; the first one-way valve and the second one-way valve are arranged on the pressing shell 1, the first one-way valve can connect the cavity 10 and the container to allow gas to be discharged from the cavity 10 into the container in one direction; the second one-way valve can connect the cavity 10 and the outside to allow gas to enter the cavity 10 from the outside in one direction;

[0036] The return spring 2 is disposed in the cavity 10 and is used to return the pressing shell 1 to its original position after the external force acting on the pressing shell 1 is released.

[0037] The liquid tube 3 is provided with a flow channel running through it along its length direction. One end of the liquid tube 3 is a pointed structure so that it can be inserted into the container. The other end of the liquid tube 3 is connected to the outside world. The liquid tube 3 is connected to the container through the fixing component.

[0038] like Figures 1 to 3 As shown, in this embodiment, the pressing shell 1 is placed above the container, one end of the liquid tube 3 is inserted into the container and the end is located below the liquid surface, the other end of the liquid tube 3 is aligned with the wound, and the pressing shell 1 is pressed downward with one hand. The pressing shell 1 is pressurized and begins to compress, and the return spring 2 is squeezed and compressed. The gas in the cavity 10 enters the container from the first one-way valve, and the pressing shell 1 closes the opening of the container. The pressure in the container increases, and the liquid flows into the other end of the liquid tube 3 from one end of the liquid tube 3 below the liquid surface due to the gas pressure. After the liquid tube 3 is no longer pressed by one hand, the return spring 2 stretches from compression to a free state, driving the pressing shell 1 to reset, and the cavity 10 begins to gradually expand. A negative pressure is formed in the cavity 10, and the external gas enters the cavity 10 from the second one-way valve.

[0039] After the medical staff presses repeatedly several times, the liquid in the container can be driven to flow out of the container smoothly through the liquid tube 3, forming a water flow to flush the wound. The water flow rate is related to the inner diameter of the liquid tube. The pressure of the water-like medicine is higher than the pouring pressure, which can improve the wound flushing effect.

[0040] The container in this embodiment can be a glass bottle, a plastic bottle or other container with a certain hardness, and the container can contain physiological saline solution, hydrogen peroxide or the like.

[0041] Reference Figures 4 to 7As an example, the liquid tube 3 includes an integrally formed first tube 31 and a second tube 32. The first tube 31 communicates with the second tube 32 and has a pointed end for insertion into a container. The second tube 32 is used to irrigate the wound. The axial directions of the first tube 31 and the second tube 32 form a non-zero angle. In this embodiment, the first tube 31 and the second tube 32 are integrally formed and perpendicular to each other, allowing liquid to flow from the first tube 31 to the second tube 32.

[0042] As an example, the wound irrigation device further includes a third tube 33, which communicates with the second tube 32. The third tube 33 and the second tube 32 are detachably connected. The third tube 33 can rotate about its own axis relative to the second tube 32, and a non-zero angle is formed between the third tube 33 and the second tube 32. In this embodiment, the inner diameter of the third tube 33 is slightly larger than the outer diameter of the second tube 32. The third tube 33 is a plastic tube. Due to its material, the third tube 33 and the second tube 32 have an interference fit. However, the third tube 33 can be detached from the second tube 32 by pulling.

[0043] As an example, the fixing assembly includes a rubber stopper that can be inserted into the opening of the container. A through-hole is provided in the middle of the rubber stopper, through which the first tube 31 extends into the container. Because this embodiment is used on a rigid container, the rubber stopper serves as a seal and also connects the first tube 31 to the container.

[0044] Reference Figure 1 and Figure 2 As an example, the pressing shell 1 includes a telescopic shell 11, an embedded tube 5 and a base 12, the cavity 10 is set in the telescopic shell 11, the telescopic shell 11 is provided with a first valve hole and a second valve hole, the interior of the base 12 is hollow, the valve hole connects the cavity 10 and the inner cavity of the base 12, the embedded tube 5 is set on the base 12, one end of the embedded tube 5 is embedded in the opening of the container, the first valve hole connects the embedded tube 5, and an air hole 121 is provided on the side wall of the base 12, and the air hole 121 connects the inner cavity of the base 12 and the outside world; the first tube 31 is set in the embedded tube 5, and the second tube 32 passes through the side wall of the embedded tube 5 and the side wall of the base 12 in sequence; the first one-way valve is set in the first valve hole, and the second one-way valve is set in the second valve hole.

[0045] Specifically, the first one-way valve includes a first valve disc 43 and a first valve body. The first valve body is provided with a first hollow area 41. The middle portion of the first valve disc 43 is fixed to the first valve body. The first valve disc 43 is elastic so that the first valve disc 43 can close the first hollow area 41.

[0046] The second one-way valve includes a second valve disc 44 and a second valve body; a second hollow area 42 is provided on the second valve body, and the middle part of the second valve disc 44 is fixed on the second hollow area 42. The second valve disc 44 is elastic so that the second valve disc 44 can close the first hollow area 41.

[0047] Reference Figure 4 and Figure 5 More specifically, the first valve hole and the second valve hole are connected to form a mounting hole 111, the first valve body and the second valve body are both plate-shaped, the first valve body and the second valve body are integrally formed to form a sealing plate 4, the first hollow area 41 and the second hollow area 42 are spaced apart on the sealing plate 4, the sealing plate 4 is installed in the mounting hole 111, and the sealing plate 4 can close the mounting hole 111, the first valve plate 43 and the second valve plate 44 are arranged on opposite sides of the sealing plate 4, the first valve plate 43 is arranged outside the cavity 10, and the second valve plate 44 is arranged inside the cavity 10.

[0048] In this embodiment, the first hollow area 41 and the second hollow area 42 are formed by hollowing out the sealing plate 4. The first valve disc 43 and the second valve disc 44 are both elastic rubber or plastic sheets. The first valve disc 43 is fixed to the first hollow area 41 by heat-melting, and the second valve disc 44 is also fixed to the second hollow area 42 by heat-melting. The sealing plate 4 is fixed to the telescopic housing 11 by means of a snap or the like and closes the mounting hole 111.

[0049] In this embodiment, one end of the embedded tube 5 is connected to the sealing plate 4 , and an opening at one end of the embedded tube 5 is communicated with the first hollow area 41 .

[0050] The working process of the first one-way valve is as follows: since the first valve plate 43 is arranged outside the cavity 10, when the gas in the cavity 10 enters the container, the gas first passes through the first hollow area 41 and blows open the outer edge of the first valve plate 43, so that the outer edge of the first valve plate 43 and the outer wall of the hollow area are spaced apart, so that the gas enters the container.

[0051] When air inhales external gas, that is, the telescopic shell 11 gradually returns to its original position under the elastic force of the return spring 2. At this time, negative pressure is formed in the telescopic shell 11. The negative pressure causes the first valve plate 43 to fit into the first hollow area 41. The area of ​​the first valve plate 43 is sufficient to cover the first hollow area 41. At this time, the first valve plate 43 closes the first hollow area 41.

[0052] Similarly, when air is drawn in from the outside, negative pressure forms within the cavity 10. Since the second valve disc 44 is disposed within the cavity 10, the negative pressure drives the outer edge of the second valve disc 44 away from the second hollow area 42. That is, the outer edge of the second valve disc 44 is spaced apart from the second hollow area 42, allowing outside air to enter the cavity 10 through this gap. Conversely, when the telescopic housing 11 is squeezed, the air within the cavity 10 squeezes the second valve disc 44, causing it to cling to the second hollow area 42, sealing it.

[0053] Reference Figure 6 In this embodiment, the wound irrigation device further includes a pressure relief valve, which is disposed on the pressing housing 1 and connects the outside world to the container. The pressure relief valve comprises a pressure relief rod 6 and a pressure spring 62. A pressure relief groove 61 is provided on the pressure relief valve. The pressure relief valve is disposed through the embedded tube 5. One end of the pressure relief valve, which penetrates the embedded tube 5, connects to the gas and is able to slide radially along the embedded tube 5. The end of the pressure relief rod 6, which extends into the embedded tube 5, seals the embedded tube 5 and the pressure relief rod 6, preventing gas from leaking through the gap between the pressure relief rod 6 and the embedded tube 5 during normal use of the wound irrigation device. To relieve pressure, the pressure relief rod 6 is pressed radially toward the central axis of the embedded tube 5, causing it to move toward the center of the embedded tube 5. This causes the pressure relief groove 61 to move toward the center of the embedded tube 5 until one end of the pressure relief rod 6 connects to the embedded tube 5 and the other end connects to the outside world. The pressure relief pipe now connects to the space above the liquid level in the container, discharging the gas above the liquid level to the outside world until the outside pressure equals the container pressure.

[0054] One end of the pressure spring 62 is connected to the pressure relief rod 6, and the other end is connected to the embedded tube 5 or the base 12. When the wound irrigation device is in normal use, the pressure spring 62 applies a force to the pressure relief rod 6 away from the central axis of the embedded tube 5, so that the end of the pressure relief rod 6 extending into the embedded tube 5 always seals the gap between the embedded tube 5 and the pressure relief rod 6.

[0055] The water absorption principle of the wound irrigation device in this embodiment is similar to the principle of a manual compression pump used in pure water buckets in daily life.

[0056] In one embodiment, the fixing assembly includes a friction portion disposed on the outer wall of the first tube 31, which is configured to increase friction between the first tube 31 and the container. The wound irrigation device can also be used in a soft bottle, such as a soft bottle containing saline solution. The first tube 31 is directly inserted into the saline solution in the soft bottle, and the saline solution is squeezed to flush the liquid directly from the soft bottle through the first tube 31, the second tube 32, and the third tube 33 to the wound. To prevent the first tube 31 from separating from the outer packaging of the saline solution during squeezing, a friction portion is provided on the outer wall of the first tube 31. The friction portion can be formed by processes such as grinding, etching, and scratching. The friction portion is typically positioned at a length where the first tube 31 and the rubber stopper are in constant contact.

[0057] Furthermore, the fixing assembly also includes a backstop cone 7, which is arranged around the first tube 31, with the tip of the backstop cone 7 facing the tip of the first tube 31. The backstop cone 7 is elastic and is generally made of soft rubber. In this embodiment, the backstop cone 7 is a cone, but a perforation is provided along the central axis of the backstop cone 7. The first tube 31 is inserted into the perforation and fixedly connected to the backstop cone 7. The tip of the backstop cone 7 and the tip of the first tube 31 are oriented in the same direction, facilitating insertion. After the first tube 31 is inserted into the saline injection bottle, the bottom of the backstop cone 7 can prevent the first tube 31 from slipping out of the bottle. The soft rubber backstop cone 7 facilitates its tip to enter the bottle, and because the backstop cone 7 is deformable, the hole formed on the bottle by the first tube 31 and the backstop cone 7 is smaller than the bottom surface of the backstop cone 7, thereby enhancing the backstop effect. The force borne by the anti-retraction cone 7 when squeezing the saline injection in the soft bottle is generally not as strong as the force exerted by a person to pull out the anti-retraction cone 7, and therefore will not affect the squeezing of the saline injection in the soft bottle.

[0058] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A wound irrigation device, characterized in that: The device comprises a pressing shell, a return spring, a first one-way valve, a second one-way valve, a fixing assembly, and a liquid pipe. The pressing shell has a cavity, and can seal the opening of an external container. The pressing shell is elastic so that the volume of the cavity can be reduced under external pressure. The first one-way valve and the second one-way valve are provided on the pressing shell, and the first one-way valve can connect the cavity and the container to allow gas to be discharged from the cavity into the container in one direction; The second one-way valve is capable of connecting the cavity with the outside world to allow gas to enter the cavity from the outside world in one direction; The return spring is disposed in the cavity, and is used to return the pressing shell to its original position after the external force acting on the pressing shell is released; The liquid pipe is provided with a flow channel running through it along its length direction, the other end of the liquid pipe is connected to the outside, and the liquid pipe is connected to the container through the fixing component.

2. The wound irrigation device according to claim 1, characterized in that It also includes a pressure relief valve, which is arranged on the pressing shell and can connect the outside world and the container.

3. The wound irrigation device according to claim 1, characterized in that The liquid tube includes a first tube and a second tube formed in one piece, the first tube is connected to the second tube, the first tube has a tip for inserting into a container, the second tube is used to flush the wound, and there is a non-zero angle between the axial direction of the first tube and the axial direction of the second tube.

4. The wound irrigation device according to claim 3, characterized in that It also includes a third tube, which is connected to the second tube. The third tube and the second tube are detachably connected. The third tube can rotate around its own axis relative to the second tube. There is a non-zero angle between the third tube and the second tube.

5. The wound irrigation device according to claim 3, characterized in that The fixing assembly includes a rubber plug, which can be plugged into the opening of an external container. A through hole is provided in the middle of the rubber plug, and the first tube extends into the container through the through hole.

6. The wound irrigation device according to claim 3, characterized in that The fixing assembly includes a friction portion provided on the outer wall of the first tube, and the friction portion is used to increase the friction force between the first tube and the container.

7. The wound irrigation device according to claim 3, characterized in that The fixing assembly further includes a back-off cone, which is arranged around the first tube, with the tip of the back-off cone facing the tip of the first tube.

8. The wound irrigation device according to claim 3, characterized in that The pressing shell includes a telescopic shell, an embedded tube and a base. The cavity is provided in the telescopic shell. The telescopic shell is provided with a first valve hole and a second valve hole. The interior of the base is hollow. The valve holes communicate with the cavity and the inner cavity of the base. The embedded tube is provided on the base. One end of the embedded tube is embedded in the opening of the container. The first valve hole communicates with the embedded tube. An air hole is provided on the side wall of the base. The air hole communicates with the inner cavity of the base and the outside. The first tube is arranged in the embedded tube, and the second tube passes through the side wall of the embedded tube and the side wall of the base in sequence; The first one-way valve is disposed in the first valve hole, and the second one-way valve is disposed in the second valve hole.

9. The wound irrigation device according to claim 8, characterized in that The first one-way valve includes a first valve disc and a first valve body. The first valve body is provided with a first hollow area. The middle portion of the first valve disc is fixed to the first valve body. The first valve disc is elastic so as to be able to close the first hollow area. The second one-way valve includes a second valve disc and a second valve body; a second hollow area is provided on the second valve body, the middle part of the second valve disc is fixed on the second hollow area, and the second valve disc is elastic so that the second valve disc can close the first hollow area.

10. The wound irrigation device according to claim 9, characterized in that The first valve hole and the second valve hole are connected to form a mounting hole, the first valve body and the second valve body are both plate-shaped, the first valve body and the second valve body are integrally formed to form a sealing plate, the first hollow area and the second hollow area are spaced apart on the sealing plate, the sealing plate is installed in the mounting hole, and the sealing plate can close the mounting hole, the first valve plate and the second valve plate are arranged on opposite sides of the sealing plate, the first valve plate is arranged outside the cavity, and the second valve plate is arranged inside the cavity.

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