Pressure protection valve and ventilation treatment equipment

Abstract

The pressure protection valve comprises a front shell, a valve disc, a valve body, a rear shell and a sealing piece, the valve body comprises a first end and a second end which deviate from each other in the first direction, the front shell is connected to the first end, the rear shell is connected to the second end, the front shell is provided with an air inlet channel, and the rear shell is provided with an air outlet channel; a containing cavity is formed in the valve body, the air inlet channel and the air outlet channel communicate with the containing cavity, and the air inlet channel is used for introducing pressurized air into the containing cavity; the valve disc is movably connected into the containing cavity in the first direction, the sealing piece is connected between the front shell and the valve disc, and the sealing piece is used for achieving sealing between the air inlet channel and the containing cavity. According to the pressure protection valve provided by the embodiment of the invention, pollutants such as gas or water can be effectively prevented from entering the gas inlet channel of the front shell from the accommodating cavity of the valve body, so that the cleanness of ventilation treatment equipment is ensured, and the harm of the pollutants to a user is avoided.

Description

Technical Field

[0001] The present application belongs to the technical field of medical devices, and specifically relates to a pressure protection valve and ventilation therapy equipment. Background Art

[0002] A ventilator provides pressurized air to assist the user in breathing and is commonly used to treat respiratory conditions such as snoring, obstructive sleep apnea (OSA), and chronic obstructive pulmonary disease (COPD). The outlet of the ventilator is typically equipped with a pressure protection valve, which connects to the user interface. When the ventilator is inactive, the pressure protection valve seals the outlet, preventing contaminants such as gas or water from entering the ventilator and ensuring its cleanliness.

[0003] In the related art, the pressure protection valve prevents oxygen or water from entering the ventilator by sealing the valve disc and the valve bottom cover. However, the sealing effect of this sealing structure is poor, and pollutants can still penetrate into the ventilator, making it difficult to avoid harm to the user. Utility Model Content

[0004] The present application aims to provide a pressure protection valve and ventilation therapy equipment to solve the problem that the existing pressure protection valve has poor sealing performance and easily causes contamination of the ventilation therapy equipment.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a pressure protection valve, comprising: a front shell, a valve disc, a valve body, a rear shell and a sealing member; wherein,

[0007] The valve body includes a first end and a second end that are separated from each other in a first direction, the front shell is connected to the first end, and the rear shell is connected to the second end. The front shell is provided with an air inlet channel, and the rear shell is provided with an air outlet channel. The valve body is provided with an accommodating cavity, and the air inlet channel and the air outlet channel are both connected to the accommodating cavity. The air inlet channel is used to introduce pressurized gas into the accommodating cavity. The first direction is the axial direction of the valve body.

[0008] The valve disc is movably connected in the accommodating cavity along the first direction, and the sealing member is arranged between the front shell and the valve disc;

[0009] When the pressurized gas does not flow into the air intake passage, the valve disc abuts against the front shell through the sealing member to achieve sealing between the air intake passage and the accommodating chamber.

[0010] Optionally, the seal is a flexible seal, which includes a support portion and a compression portion connected to each other along the first direction, the support portion is connected to one of the front shell and the valve disc, and the compression portion is abutted against the other of the front shell and the valve disc, wherein the compression portion can be deformed to achieve sealing between the air intake channel and the accommodating chamber.

[0011] Optionally, the compression portion includes a first side and a second side disposed away from each other, the first side being close to the support portion; wherein,

[0012] The thickness of the compressed portion decreases gradually from the first side to the second side.

[0013] Optionally, the compression portion extends radially outwards along the supporting portion, or the compression portion extends radially inwards along the supporting portion.

[0014] Optionally, a first mating plane is provided on a side of the valve disc close to the front shell, and the sealing member is connected to a side of the front shell close to the valve disc, and the sealing member is used to abut against the first mating plane to achieve sealing between the air intake channel and the accommodating cavity.

[0015] Optionally, the sealing member and the front shell are an integrally formed structure.

[0016] Optionally, a second mating plane is provided on the side of the front shell close to the valve disc, the sealing member is connected to the side of the valve disc close to the front shell, and the sealing member is used to abut against the second mating plane to achieve sealing between the air intake channel and the accommodating cavity.

[0017] Optionally, a first mating bevel is provided on the side of the front shell close to the valve disc, and a circumferential edge of the valve disc is provided with an annular mounting surface that is concave away from the front shell. The seal is connected to the annular mounting surface, and the seal is used to abut against the first mating bevel to achieve sealing between the air inlet channel and the accommodating cavity.

[0018] Optionally, the sealing member and the valve disc are an integrally formed structure.

[0019] Optionally, the pressure protection valve further comprises a biasing component connected to a side of the valve disc facing away from the sealing member;

[0020] When the pressurized gas does not flow into the intake passage, the biasing member is configured to drive the valve disc to abut against the front housing.

[0021] In a second aspect, the present application further discloses a ventilation therapy device comprising the pressure protection valve as described above.

[0022] In the embodiment of the present application, when pressurized gas is not introduced into the air inlet passage, the valve disc abuts against the front shell. At this time, since the seal is connected between the front shell and the valve disc, when the valve disc abuts against the front shell but there is still a gap, the setting of the seal can enhance the sealing between the valve disc and the front shell, effectively preventing pollutants such as gas or water from entering the air inlet passage of the front shell from the accommodating cavity of the valve body, and the pollutants cannot continue to flow back to the ventilation therapy equipment through the air inlet passage, thereby ensuring the cleanliness of the ventilation therapy equipment and preventing pollutants from causing harm to the user.

[0023] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 This is a schematic structural diagram of a pressure protection valve in an embodiment of the present application;

[0026] Figure 2 This is a schematic diagram of an explosion of a pressure protection valve in an embodiment of the present application;

[0027] Figure 3 This is a schematic structural diagram of the valve body in an embodiment of the present application;

[0028] Figure 4 is a cross-sectional view of the valve body in the embodiment of the present application;

[0029] Figure 5 This is a schematic structural diagram of the rear housing in an embodiment of the present application;

[0030] Figure 6 Schematic diagram of the structure of the biasing component in the embodiment of the present application;

[0031] Figure 7 This is a schematic diagram of the coordination of the front housing, the sealing member, and the valve disc in one embodiment of the present application;

[0032] Figure 8 This is a schematic diagram of the internal structure of an embodiment of the present application without the introduction of pressurized gas;

[0033] Figure 9 is a cross-sectional view of an embodiment of the present application without the introduction of pressurized gas;

[0034] Figure 10 This is a schematic diagram of the internal structure of an embodiment of the present application in which pressurized gas is introduced;

[0035] Figure 11 is a cross-sectional view of an embodiment of the present application in which pressurized gas is introduced;

[0036] Figure 12 This is one of the structural diagrams of the sealing member and the valve disc in another embodiment of the present application;

[0037] Figure 13 is one of the cross-sectional views of a sealing member and a valve disc in another embodiment of the present application;

[0038] Figure 14 This is one of the schematic diagrams of the coordination of the front housing, the sealing member and the valve disc in another embodiment of the present application;

[0039] Figure 15 This is one of the internal structure diagrams of another embodiment of the present application without the introduction of pressurized gas;

[0040] Figure 16 This is one of the cross-sectional views of another embodiment of the present application without the introduction of pressurized gas;

[0041] Figure 17 This is a second structural diagram of a sealing member and a valve disc in another embodiment of the present application;

[0042] Figure 18 This is a second cross-sectional view of a sealing member and a valve disc in another embodiment of the present application;

[0043] Figure 19 This is a second cross-sectional view of another embodiment of the present application without the introduction of pressurized gas;

[0044] Figure 20 This is the third structural diagram of the sealing member and the valve disc in another embodiment of the present application;

[0045] Figure 21 This is a third cross-sectional view of another embodiment of the present application without the introduction of pressurized gas;

[0046] Figure 22 This is a schematic diagram of an explosion of a pressure protection valve in yet another embodiment of the present application;

[0047] Figure 23 This is a schematic diagram of the coordination of the front housing, the sealing member, and the valve disc in yet another embodiment of the present application;

[0048] Figure 24 This is a schematic diagram of the internal structure of another embodiment of the present application without the introduction of pressurized gas;

[0049] Figure 25 is a cross-sectional view of yet another embodiment of the present application without the introduction of pressurized gas;

[0050] Figure 26 This is a schematic diagram of the internal structure of another embodiment of the present application in which pressurized gas is introduced;

[0051] Figure 27This is a cross-sectional view of another embodiment of the present application in which pressurized gas is introduced.

[0052] Figure numerals: 10 - front shell, 11 - air inlet channel, 12 - second mating plane, 13 - first mating inclined surface, 20 - sealing member, 21 - supporting portion, 22 - compression portion, 30 - valve disc, 31 - first mating plane, 32 - annular mounting surface, 33 - guide surface, 34 - valve stem, 40 - biasing component, 50 - valve body, 51 - partition, 511 - exhaust port, 52 - inner cavity, 53 - outer cavity, 54 - limiting groove, 55 - limiting ring, 60 - rear shell, 61 - air outlet channel. DETAILED DESCRIPTION

[0053] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0054] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly refer to one or more of the features. Throughout the description of this application, unless otherwise specified, "plurality" means two or more. Furthermore, "and / or" in the specification and claims refers to at least one of the connected entities, and the character " / " generally indicates an "or" relationship between the connected entities.

[0055] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] In the description of this application, 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 or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0057] The present application provides a pressure protection valve. In practical applications, the valve can be connected to the outlet of a ventilation therapy device. When the ventilation therapy device is shut down, the valve prevents contaminants such as air and water from entering the device, ensuring the safety and cleanliness of the device. The valve can be used in various types of ventilation therapy devices, including noninvasive positive airway pressure (CPAP), positive airway pressure assist devices (PAP), and high-flow humidified oxygen therapy devices.

[0058] The pressure protection valve provided in the embodiment of the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0059] It should be noted that if Figure 1 、 Figure 2 As shown, the first direction in the embodiment of the present application is the direction indicated by the arrow x in the figure.

[0060] like Figures 1 to 6 As shown, the pressure protection valve provided by the embodiment of the present application includes: a front shell 10 , a sealing member 20 , a valve disc 30 , a biasing member 40 , a valve body 50 and a rear shell 60 .

[0061] Specifically, the valve body 50 includes a first end and a second end that deviate from each other along a first direction x. The front shell 10 is connected to the first end of the valve body 50. The front shell 10 is provided with an air inlet channel 11. A accommodating chamber is provided in the valve body 50. The air inlet channel 11 is connected to the accommodating chamber. The air inlet channel 11 is used to introduce pressurized gas into the accommodating chamber. The rear shell 60 is connected to the second end of the valve body 50. The rear shell 60 is used to connect with connecting pipes, user interfaces, etc. to realize the delivery of pressurized gas. The rear shell 60 is provided with an air outlet channel 61. The air outlet channel 61 is connected to the accommodating chamber. The pressurized gas can enter the air outlet channel 61 from the accommodating chamber of the valve body 50 and be output from the pressure protection valve by the air outlet channel 61.

[0062] The valve disc 30 is movably connected within the accommodating chamber along a first direction x, and the seal 20 is disposed between the front housing 10 and the valve disc 30. The pressure protection valve further includes a biasing member 40 connected to the side of the valve disc 30 facing away from the seal 20. The valve disc 30 includes a sealing mating surface and a valve stem 34 interconnected along the first direction x. The seal 20 is connected between the front housing 10 and the sealing mating surface. Because the front housing 10 is provided with an air inlet passage 11, the diameter of the sealing mating surface is set to be no less than the diameter of the air inlet passage 11 on the side proximal to the valve disc 30, thereby sealing the air inlet passage 11. A guide surface 33 is also provided on the sealing mating surface. The guide surface 33 is a conical protrusion disposed at the center of the sealing mating surface. The conical protrusion protrudes toward the front housing 10 and has an aerodynamic curve. As pressurized gas flows from the air inlet passage 11 into the accommodating chamber of the valve body 50, the guide surface 33 serves to guide the flow and reduce flow resistance. The side of the valve stem 34 away from the front housing 10 abuts against the biasing member 40. When pressurized gas is not introduced into the air intake passage 11, the biasing component 40 is used to drive the valve disc 30 to move toward the front shell 10, and to make the valve disc 30 abut against the front shell 10 through the sealing member 20. Since the sealing member 20 is located between the front shell 10 and the valve disc 30, the air intake passage 11 and the accommodating cavity can be sealed.

[0063] The biasing member 40 may include a coil spring. More specifically, the biasing member 40 may be configured as a compression spring. This compression spring can be compressed when subjected to an external force and can return to its original state when the external force disappears. Specifically, when the predetermined pressure is not reached inside the pressure protection valve, that is, the pressure of the pressurized gas does not reach the predetermined value, the restoring force of the compression spring itself can cause the valve disc 30 to abut against the front shell 10. At this time, since the seal 20 is arranged between the valve disc 30 and the front shell 10, an effective seal can be formed between the valve disc 30 and the front shell 10. When the predetermined pressure is reached inside the pressure protection valve, that is, when the pressure of the pressurized gas reaches the predetermined value, the pressurized gas can apply pressure to the compression spring in the first direction, so that the compression spring is compressed by the pressure, thereby connecting the air inlet channel of the front shell 10 with the accommodating cavity of the valve body 50, and the pressure protection valve is in a passage state.

[0064] It should be noted that the common pressure protection valve in the prior art has a valve disc 30 and a front shell 10 made of plastic material. When the two are in contact with each other, the sealing is poor. However, the present application sets a seal 20 between the front shell 10 and the valve disc 30 to achieve sealing between the air intake channel 11 and the accommodating cavity, thereby preventing pollutants such as air and water from flowing back into the ventilation therapy equipment through the air intake channel 11.

[0065] Furthermore, a partition 51 is provided within the valve body 50. The partition 51 divides the accommodating chamber of the valve body 50 into an inner chamber 52 and an outer chamber 53. The outer chamber 53 communicates with the air outlet passage 61 of the rear housing 60. Furthermore, an air outlet is provided on the partition 51, the ends of which respectively connect the inner chamber 52 of the valve body 50 with the external atmosphere. A limit ring 55 is provided within the partition 51. The limit ring 55 defines a cylindrical limit groove 54 within the valve body 50. The biasing member 40 can be mounted within the limit groove 54. Because the limit ring 55 can have a certain length along the first direction x, when the biasing member 40 pushes the valve disc 30 to move, the limit ring 55 can ensure that the valve stem 34 of the valve disc 30 moves substantially along the first direction x within the limit groove 54 without deflection, thereby ensuring that the sealing surface of the valve disc 30 can be aligned with the air inlet passage 11 of the front housing 10 along the first direction x.

[0066] The working principle of the pressure protection valve provided in the embodiment of the present application is described below:

[0067] The inlet channel 11 of the pressure protection valve is generally connected to the outlet of the ventilation therapy device and receives the pressurized gas generated by the ventilation therapy device. The outlet channel 61 is generally connected to the pipeline, patient interface, etc. In the gas path of the pressurized gas, the outlet channel 61 is generally connected to the oxygen source for use.

[0068] When the ventilation therapy device is started and the pressurized gas reaches a predetermined pressure, the valve disc 30 is subjected to pressure to offset the elastic force of the biasing component 40 and moves away from the front shell 10 along the first direction x, so that the sealing mating surface of the valve disc 30 engages the partition 51 of the valve body 50. At this time, the connection between the pressurized gas flow and the inner cavity 52 and the exhaust port 511 is blocked, and the gas flow flows from the outer cavity 53 and passes through the outlet channel 61, and finally reaches the patient end.

[0069] When pressurized air is unavailable, such as when the ventilation therapy device is shut down, the biasing member 40, under its own restoring force, drives the valve disc 30 toward the front housing 10. The sealing surface of the valve disc 30 engages and compresses the sealing portion of the front housing 10, thereby forming an effective seal and preventing air, water vapor, oxygen, or any other contaminants from entering the inlet of the ventilation therapy device. At this point, air, oxygen, water vapor, or other contaminants at the rear end of the pressure protection valve enter the pressure protection valve through the outlet port, pass through the outer chamber 53, flow through the partition 51, and then reach the inner chamber 52, ultimately exiting the exhaust port 511 to the outside atmosphere, effectively preventing contamination of the ventilation therapy device.

[0070] It should be noted that, in the embodiment of the present application, the first direction x is the axial direction of the valve body 50 .

[0071] In one embodiment of the present application, the seal 20 is a flexible seal 20, which includes a support portion 21 and a compression portion 22 connected to each other, the support portion 21 is connected to one of the front shell 10 and the valve disc 30, and the compression portion 22 is abutted against the other of the front shell 10 and the valve disc 30, wherein the compression portion 22 can be deformed to achieve sealing between the air intake channel 11 and the accommodating cavity.

[0072] Specifically, the support portion 21 can be connected to the front shell 10 or the valve disc 30, and the compression portion 22 extends toward the other of the front shell 10 and the valve disc 30. For example, when the support portion 21 is connected to the front shell 10, the compression portion 22 extends toward the valve disc 30, and when the support portion 21 is connected to the valve disc 30, the compression portion 22 extends toward the front shell 10. Since the support portion 21 needs to be connected to the front shell 10 or the valve disc 30, its deformation is limited, while the compression portion 22 can deform under stress conditions, improving the tightness of the abutment between the front shell 10 and the valve disc 30, thereby achieving a seal between the air intake passage 11 and the accommodating chamber. In practical applications, the hardness of the seal is preferably 10 degrees, and can also be 20 degrees or 30 degrees.

[0073] Optionally, the compression portion 22 includes a first side and a second side disposed opposite to each other, and the first side is close to the support portion 21 ; wherein the thickness of the compression portion 22 decreases gradually from the first side to the second side.

[0074] In practical applications, the seal 20 can be a sealing ring, and the compression portion 22 of the seal 20 can have a thickness that gradually decreases from the side closest to the support portion 21 to the side farther away from the support portion 21. It is understood that the thinner the thickness of the seal 20 made of such a flexible material, the easier it is to deform and compress, thus improving the sealing performance. Furthermore, the thicker portion provides greater strength and support, thereby ensuring the stability of the overall structure of the seal 20.

[0075] Optionally, the compression portion 22 extends outward in the radial direction of the support portion 21 , or the compression portion 22 extends inward in the radial direction of the support portion 21 .

[0076] Specifically, if Figures 12 to 16 As shown, it is a schematic diagram of the pressure protection valve in which the compression portion 22 extends radially inwardly along the support portion 21 in the embodiment of the present application. Figures 17 to 21 FIG. 1 is a schematic diagram of a pressure protection valve according to an embodiment of the present application, wherein the compression portion 22 extends radially outward from the support portion 21. The support portion 21 includes an inwardly opening annular groove that engages with the edge of the valve disc 30 to achieve connection between the seal 20 and the valve disc 30.

[0077] like Figure 20 and Figure 21As shown, the seal 20 includes a layer of support portion 21 and two layers of compression portions 22. The two layers of compression portions 22 are connected to each other and to one side of the support portion 21. It can be understood that under the structure of this seal 20, since two layers of compression portions 22 are provided, a three-layer seal of compression portion 22-compression portion 22-support portion 21 can actually be achieved, which is beneficial to enhance the sealing effect between the front shell 10 and the valve disc 30.

[0078] In practical applications, the extension direction of the compression portion 22 and the number of the compression portions 22 can be freely selected, and this application does not impose any specific limitations on this.

[0079] In one embodiment of the present application, Figures 7 to 11 As shown, a first mating plane 31 is provided on the side of the valve disc 30 close to the front shell 10, and the sealing member 20 is connected to the side of the front shell 10 close to the valve disc 30. The sealing member 20 is used to abut against the first mating plane 31 to achieve sealing between the air intake channel 11 and the accommodating cavity.

[0080] Specifically, since the front shell 10 is provided with an air intake channel 11, the front shell 10 is a hollow structure on the side close to the valve body 50. When the seal 20 is connected to the front shell 10, the seal 20 is a sealing ring, and the diameter of the sealing ring is smaller than the diameter of the air intake channel 11 on the side close to the valve body 50. The sealing mating surface on the valve disc 30 is a first mating plane 31. When the biasing component 40 drives the valve disc 30 to abut against the front shell 10, the seal 20 can achieve sealing between the air intake channel 11 and the accommodating cavity.

[0081] Optionally, the sealing member 20 and the front shell 10 are an integrally formed structure.

[0082] Specifically, the sealing member 20 and the front housing 10 can be formed by a secondary molding overmolding process. It should be noted that the sealing member 20 and the front housing 10 can also be bonded together afterward, which is not specifically limited in this application.

[0083] It can be understood that when the seal 20 and the front shell 10 are formed into an integrated structure using a secondary molding overmolding process, the connection strength between the seal 20 and the front shell 10 is higher and the integrity is better, which can effectively prevent the seal 20 from falling off from the front shell 10 during the operation of the pressure protection valve, thereby ensuring the sealing effect of the pressure protection valve.

[0084] In another embodiment of the present application, a second mating plane 12 is provided on the side of the front shell 10 close to the valve disc 30, and a seal 20 is connected to the side of the valve disc 30 close to the front shell 10. The seal 20 is used to abut against the second mating plane 12 to achieve sealing between the air intake channel 11 and the accommodating cavity.

[0085] Specifically, the front housing 10 is provided with an air inlet passage 11. Therefore, the front housing 10 has a hollow structure on the side near the valve body 50, and the valve disc 30 is provided with a sealing surface for sealing the air inlet passage 11. The seal 20 is connected to the sealing surface of the valve disc 30 on the side near the front housing 10. When the biasing member 40 drives the valve disc 30 to abut against the front housing 10, the seal 20 can achieve a seal between the air inlet passage 11 and the accommodating chamber.

[0086] In another embodiment of the present application, Figures 22 to 27 As shown, a first mating bevel 13 is provided on the side of the front shell 10 close to the valve disc 30, and a circumferential edge of the valve disc 30 is provided with an annular mounting surface 32 that is concave away from the front shell 10. The seal 20 is connected to the annular mounting surface 32, and the seal 20 is used to abut against the first mating bevel 13 to achieve sealing between the air inlet channel 11 and the accommodating cavity.

[0087] Specifically, a first mating bevel 13 is provided on the side of the front housing 10 near the valve disc 30, and the air inlet passage 11 and the first mating bevel 13 form a uniform transition. The support portion 21 of the seal 20 is connected to the annular mounting surface 32 of the valve disc 30, and the compression portion 22 of the seal 20 abuts against the first mating bevel 13. In the embodiment of the present application, when the front housing 10 is provided with the first mating bevel 13, the compression portion 22 can deform to a greater extent under the guidance of the bevel, thereby enhancing the sealing between the front housing 10 and the valve disc 30.

[0088] Optionally, the sealing member 20 and the valve disc 30 are an integrally formed structure.

[0089] Similarly, the seal 20 and the valve disc 30 can be formed by a secondary molding overmolding process. It should be noted that the seal 20 and the valve disc 30 can also be bonded afterward, which is not specifically limited in this application.

[0090] It can be understood that when the seal 20 and the valve disc 30 are formed into an integrated structure using a secondary molding overmolding process, the connection strength between the seal 20 and the valve disc 30 is higher and the integrity is better, which can effectively prevent the seal 20 from falling off the valve disc 30 during the operation of the pressure protection valve, thereby ensuring the sealing effect of the pressure protection valve.

[0091] The present application also discloses a ventilation therapy device, comprising the pressure protection valve as described above.

[0092] Specifically, the outlet pipe of the ventilation therapy device is connected to the front shell 10 of the pressure protection valve, and the pressurized gas is introduced into the air inlet channel 11 of the front shell 10 .

[0093] In summary, the pressure protection valve provided in the embodiments of the present application has at least the following advantages:

[0094] The pressure protection valve provided in the embodiment of the present application has a valve disc abutting against the front shell when no pressurized gas is introduced into the air inlet passage. At this time, since the sealing member is connected between the front shell and the valve disc, when the valve disc abuts against the front shell but there is still a gap, the provision of the sealing member can enhance the sealing between the valve disc and the front shell, effectively preventing pollutants such as gas or water from entering the air inlet passage of the front shell from the accommodating cavity of the valve body, and the pollutants cannot continue to flow back to the ventilation therapy equipment through the air inlet passage, thereby ensuring the cleanliness of the ventilation therapy equipment and preventing pollutants from causing harm to the user.

[0095] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0096] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A pressure protection valve, characterized in that: include: Front shell, valve disc, valve body, rear shell and sealing parts; among them, The valve body includes a first end and a second end that are separated from each other in a first direction, the front shell is connected to the first end, and the rear shell is connected to the second end. The front shell is provided with an air inlet channel, and the rear shell is provided with an air outlet channel. The valve body is provided with an accommodating cavity, and the air inlet channel and the air outlet channel are both connected to the accommodating cavity. The air inlet channel is used to introduce pressurized gas into the accommodating cavity. The first direction is the axial direction of the valve body. The valve disc is movably connected in the accommodating cavity along the first direction, and the sealing member is arranged between the front shell and the valve disc; When the pressurized gas does not flow into the air intake passage, the valve disc abuts against the front shell through the sealing member to achieve sealing between the air intake passage and the accommodating chamber.

2. The pressure protection valve according to claim 1, characterized in that: The seal is a flexible seal, which includes a support portion and a compression portion connected to each other along the first direction, the support portion is connected to one of the front shell and the valve disc, and the compression portion abuts against the other of the front shell and the valve disc, wherein the compression portion can be deformed to achieve sealing between the air intake channel and the accommodating chamber.

3. The pressure protection valve according to claim 2, characterized in that: The compression portion includes a first side and a second side disposed opposite to each other, the first side being close to the support portion; wherein, The thickness of the compressed portion decreases gradually from the first side to the second side.

4. The pressure protection valve according to claim 2, characterized in that: The compression portion extends outward in the radial direction of the support portion, or the compression portion extends inward in the radial direction of the support portion.

5. The pressure protection valve according to claim 1, characterized in that: A first mating plane is provided on a side of the valve disc close to the front shell, and the sealing member is connected to a side of the front shell close to the valve disc. The sealing member is used to abut against the first mating plane to achieve sealing between the air intake channel and the accommodating cavity.

6. The pressure protection valve according to claim 5, characterized in that: The sealing member and the front shell are integrally formed.

7. The pressure protection valve according to claim 1, characterized in that: A second mating plane is provided on the side of the front shell close to the valve disc, and the sealing member is connected to the side of the valve disc close to the front shell. The sealing member is used to abut against the second mating plane to achieve sealing between the air intake channel and the accommodating cavity.

8. The pressure protection valve according to claim 1, characterized in that: A first mating bevel is provided on the side of the front shell close to the valve disc, and a circumferential edge of the valve disc is provided with an annular mounting surface that is concave away from the front shell. The sealing member is connected to the annular mounting surface, and the sealing member is used to abut against the first mating bevel to achieve sealing between the air inlet channel and the accommodating cavity.

9. The pressure protection valve according to any one of claims 7 or 8, characterized in that: The sealing element and the valve disc are an integrally formed structure.

10. The pressure protection valve according to claim 1, characterized in that: The pressure protection valve further comprises a biasing member connected to a side of the valve disc facing away from the sealing member; When the pressurized gas does not flow into the intake passage, the biasing member is configured to drive the valve disc to abut against the front housing.

11. A ventilation therapy device, characterized in that: Comprising the pressure protection valve according to any one of claims 1 to 10.

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