Pressure protection valve and positive airway pressure ventilation device

Abstract

The utility model relates to a pressure protection valve and an airway positive pressure ventilation device, and relates to the technical field of positive pressure ventilation. According to the pressure protection valve, the structure is that the first valve body and the second valve body are fixedly connected, so that only the first valve body and the second valve body need to be connected during connection, that is, the two parts can be connected through one-time welding or bonding; therefore, the stability and reliability of the pressure protection valve can be improved, and the technological process of the pressure protection valve is simplified.

Description

Technical Field

[0001] The utility model relates to the technical field of positive pressure ventilation, in particular to a pressure protection valve and an airway positive pressure ventilation device. Background Art

[0002] When pressure gas is input to the breathing mask through the airflow generator of the positive airway pressure device (PAP) or the continuous positive airway pressure device (CPAP), in order to prevent the gas from flowing back into the airflow generator, a pressure protection valve is generally connected to the airflow generator. The existing pressure protection valve consists of three parts, namely the valve top cover, the valve bottom cover and the valve body between the two. The valve top cover provides an air outlet port to connect to the breathing mask. The valve bottom cover provides an air inlet port to connect to the airflow generator. The valve disc in the valve body can connect different chambers in different states to prevent gas backflow. The valve top cover, the valve bottom cover and the valve body are generally connected by ultrasonic welding or bonding. When the three are connected, if one ultrasonic welding is used, there may be a risk of low stability, resulting in poor sealing, thereby losing pressure and causing the product to fail; if two welding methods are used, the process flow will be increased, so it is time-consuming and labor-intensive. At the same time, too many and complicated steps will also reduce the stability and reliability of the product. Utility Model Content

[0003] The utility model provides a pressure protection valve and an airway positive pressure ventilation device, which are used to solve at least one of the above-mentioned technical problems.

[0004] According to a first aspect of the utility model, the utility model provides a pressure protection valve, comprising a first valve body and a second valve body, wherein the first valve body and the second valve body are fixedly connected, the first valve body comprises an air inlet port, and the second valve body comprises an air outlet port and an exhaust port;

[0005] Wherein, a sealing actuator is provided in the second valve body or between the first valve body and the second valve body, the sealing actuator is located between the air inlet port and the air outlet port, and the sealing actuator is configured to move to a first position when a force is applied through the air inlet port; and move to a second position when no force is applied through the air inlet port;

[0006] The first position is a position where the air inlet port is in fluid communication with the air outlet port, and the second position is a position where the air outlet port is in fluid communication with the exhaust port.

[0007] In one embodiment, the second valve body comprises a receiving groove, an exhaust cavity arranged around the circumference of the receiving groove, and a vent cavity arranged around the circumference of the exhaust cavity, wherein the vent cavity is located between the air inlet port and the air outlet port, and the sealing actuator is arranged in the receiving groove and connected to the driving member in the receiving groove;

[0008] When the pressure gas sufficient to move the sealing actuator is input into the air inlet port, the sealing actuator is actuated by the pressure gas to move to the first position in the receiving groove; when the pressure gas sufficient to move the sealing actuator is not input into the air inlet port, the sealing actuator is actuated by the driving member to move in the opposite direction to the second position in the receiving groove;

[0009] Wherein, when the sealing actuator is located in the first position, the first sealing surface of the sealing actuator seals the exhaust cavity, and the air inlet port is fluidly connected with the air outlet port through the ventilation cavity; when the sealing actuator is located in the second position, the second sealing surface of the sealing actuator seals the ventilation cavity, and the exhaust cavity is fluidly connected with the exhaust port.

[0010] In one embodiment, the driving member is an elastic element or a magnetic element, and the driving member is disposed at the closed end of the accommodating groove.

[0011] In one embodiment, the seal actuator comprises:

[0012] A sealing disk, wherein two opposite side walls thereof are respectively a first sealing surface and a second sealing surface;

[0013] a guide rod extending from the first sealing surface and adapted to cooperate with the receiving groove, wherein one end of the guide rod is connected to the driving member; and

[0014] A positioning rib, which is arranged on the circumferential side wall of the guide rod and extends along the axial direction of the guide rod, and the number of the positioning ribs is multiple, and the multiple positioning ribs are respectively arranged at intervals along the circumference of the guide rod;

[0015] The receiving groove is provided with a plurality of notches extending along its axial direction, and when the guide rod is matched with the receiving groove, the positioning rib is matched with the corresponding notches.

[0016] In one embodiment, the first sealing surface is further provided with a conical protrusion protruding toward the air inlet port.

[0017] In one embodiment, the exhaust cavity is configured as a columnar structure or a conical structure whose diameter increases in a direction away from the exhaust port.

[0018] In one embodiment, the second valve body includes a main body, and the circumferential outer wall of the main body is provided with anti-skid ribs extending along the circumferential direction or axial direction thereof. The number of the anti-skid ribs is multiple, and the multiple anti-skid ribs are arranged at intervals along the circumference of the main body.

[0019] In one embodiment, the second valve body further includes an air outlet connector, the air outlet port is arranged on the air outlet connector, and the main body is connected to the air outlet connector via a flat portion or a conical portion.

[0020] In one embodiment, the exhaust port is disposed on the main body and / or the tapered portion, and there are multiple exhaust ports, which are spaced apart along the circumference of the main body.

[0021] In one embodiment, the first valve body includes an air inlet interface and a connecting groove, the air inlet port and the connecting groove are respectively arranged at two ends of the air inlet interface and are fluidly connected through the air inlet interface, the connecting groove accommodates a portion of the second valve body, and an end of the second valve body abuts against a bottom wall of the connecting groove;

[0022] Wherein, when the sealing actuator is located at the second position, the second sealing surface of the sealing actuator abuts against the end surface of the air inlet interface communicating with the connecting groove to seal the ventilation cavity.

[0023] According to the second aspect of the utility model, the utility model provides an airway positive pressure ventilation device, including an airflow generating device and a breathing mask connected to a fluid, and also includes the above-mentioned pressure protection valve, which is arranged on the pipeline between the airflow generating device and the breathing mask.

[0024] Compared with the prior art, the advantage of the utility model is that the pressure protection valve is constructed in a structural form in which the first valve body and the second valve body are fixedly connected. Therefore, when connecting, it is only necessary to connect the first valve body and the second valve body, that is, only one welding or bonding is required to connect the two components, thereby improving the stability and reliability of the pressure protection valve and simplifying its process flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0026] Figure 1 It is a three-dimensional structural schematic diagram of the pressure protection valve in Example 1 of the utility model;

[0027] Figure 2 It is an exploded view of the pressure protection valve in Example 1 of the utility model;

[0028] Figure 3 yes Figure 2 A schematic diagram of the three-dimensional structure of the sealing actuator as viewed from the front side;

[0029] Figure 4 yes Figure 2 A schematic diagram of the three-dimensional structure of the sealing actuator as viewed from the rear side;

[0030] Figure 5 yes Figure 2 The three-dimensional structural schematic diagram of the second valve body as viewed from the rear side;

[0031] Figure 6 yes Figure 2 A schematic diagram of the three-dimensional structure of the second valve body as viewed from the front side;

[0032] Figure 7 yes Figure 2 A cross-sectional view of the second valve body shown;

[0033] Figure 8 yes Figure 2 A cross-sectional view of the second valve body cut from another direction;

[0034] Fig. 9 yes Figure 2 The three-dimensional structural schematic diagram of the first valve body shown is viewed from the front side;

[0035] Fig.10 yes Figure 2 The three-dimensional structural schematic diagram of the first valve body shown is viewed from the rear side;

[0036] Fig.11 yes Figure 2 A schematic diagram of the three-dimensional structure of the elastic element shown;

[0037] Fig.12 is a three-dimensional cross-sectional view of the pressure protection valve in Example 1 of the utility model, wherein the sealing actuator is in a first position;

[0038] Fig.13 is a three-dimensional cross-sectional view of the pressure protection valve in Example 1 of the utility model, wherein the sealing actuator is in the second position;

[0039] Fig.14 is a schematic diagram of the three-dimensional structure of the second valve body in Embodiment 2 of the present utility model as viewed from the rear side;

[0040] Fig.15 is a schematic diagram of the three-dimensional structure of the second valve body in Embodiment 2 of the present utility model as viewed from the front side;

[0041] Fig.16 is a cross-sectional view of the second valve body in Embodiment 2 of the present utility model;

[0042] Fig.17 is a three-dimensional cross-sectional view of the pressure protection valve in Example 2 of the utility model, wherein the sealing actuator is in the second position;

[0043] Fig.18 is a schematic diagram of the three-dimensional structure of the second valve body in Embodiment 3 of the present utility model observed from the rear side;

[0044] Fig.19 is a schematic diagram of the three-dimensional structure of the second valve body in Embodiment 3 of the present utility model as viewed from the front side;

[0045] Fig. 20 is a cross-sectional view of the second valve body in Embodiment 3 of the present utility model;

[0046] Fig.21 is a three-dimensional cross-sectional view of the pressure protection valve in Example 3 of the utility model, wherein the sealing actuator is in the second position;

[0047] Fig. 22 It is a front view of the pressure protection valve in Embodiment 4 of the present utility model;

[0048] Fig.23 yes Fig. 22 A perspective cross-sectional view of the pressure protection valve is shown with the seal actuator in a second position.

[0049] Reference numerals:

[0050] 1. First valve body; 2. Second valve body; 3. Sealing actuator; 4. Elastic element;

[0051] 11. Air inlet port; 12. End surface where the air inlet interface is connected to the connecting groove; 13. Connecting groove; 14. Air inlet interface;

[0052] 21. air outlet port; 22. main body; 221. anti-skid ribs; 23. air outlet; 24. air exhaust cavity; 25. conical portion; 26. receiving groove; 261. notch; 27. ventilation cavity; 28. air outlet joint; 29. ​​flat portion;

[0053] 201, first columnar body; 202, second columnar body; 203, first supporting rib; 204, second supporting rib; 205, exhaust channel;

[0054] 30. Sealing disk; 31. First sealing surface; 32. Conical protrusion; 33. Second sealing surface; 34. Guide rod; 35. Positioning rib. DETAILED DESCRIPTION

[0055] The utility model will be further described below in conjunction with the accompanying drawings.

[0056] like Figure 1-Figure 23 As shown, according to the first aspect of the present invention, the present invention provides a pressure protection valve, which can be applied to a positive airway pressure (PAP) device (or a continuous positive airway pressure (CPAP) device), which can prevent the risk of therapeutic gas flowing back into the PAP device (or CPAP device) and causing damage to it during use.

[0057] The pressure protection valve of the utility model comprises a first valve body 1 and a second valve body 2. The first valve body 1 and the second valve body 2 can be fixedly connected in the circumferential direction, or can be fixedly connected in the axial direction. The two can be fixedly connected by ultrasonic welding, or can be bonded by adhesives such as glue. Therefore, the pressure protection valve of the utility model only needs one welding or bonding to connect the two parts. Compared with the technical solution of multiple fixed connections that require welding of the valve top cover and the valve body and the valve body and the valve bottom cover in the prior art, the pressure protection valve of the utility model can improve the stability and reliability of the pressure protection valve and simplify its process flow because it only performs one fixed connection operation.

[0058] Example 1

[0059] like Figure 1-Figure 13 As shown, the pressure protection valve of the utility model comprises a first valve body 1 and a second valve body 2, and the first valve body 1 and the second valve body 2 are fixedly connected in the circumferential direction. Figure 1 and Figure 2 As shown, the first valve body 1 includes an air inlet port 11, which is arranged on one end of the first valve body 1 away from the second valve body 2 and is used to be connected to a PAP device (or CPAP device) to deliver pressurized gas (pressurized air) output by the PAP device (or CPAP device).

[0060] The second valve body 2 includes an outlet port 21 and an exhaust port 23. The outlet port 21 is arranged opposite to the inlet port 11 and is located at an end of the second valve body 2 away from the first valve body 1, and is used to be connected to the patient side to deliver positive pressure gas to the patient. The exhaust port 23 can be arranged on the circumferential side wall of the second valve body 2.

[0061] like Figure 2 As shown, the pressure protection valve of the present invention further includes a sealing actuator 3. In the present embodiment 1, since the first valve body 1 and the second valve body 2 are fixedly connected in the circumferential direction, the sealing actuator 3 is located in the second valve body 2. Alternatively, it can also be imagined that if the first valve body 1 and the second valve body 2 are fixedly connected in the axial direction, that is, the first valve body 1 and the second valve body 2 are spliced ​​in the axial direction, the sealing actuator 3 can be arranged between the first valve body 1 and the second valve body 2.

[0062] Please continue to see Figure 2 The sealing actuator 3 is disposed in the second valve body 2 and is located between the air inlet port 11 and the air outlet port 21. The sealing actuator 3 is configured to move to a first position when a force is applied through the air inlet port 11, and to move to a second position when no force is applied through the air inlet port 11. Fig.13 As shown, the first position is a position where the air inlet port 11 is fluidly connected to the air outlet port 21; Fig.12 As shown, the second position is a position where the gas outlet port 21 is in fluid communication with the gas outlet 23 .

[0063] The force mentioned above may be, for example, the effect of pressure, or the effect of magnetic attraction, etc. For example, when applying the effect of pressure, it can be achieved by introducing pressurized gas into the air inlet port 11 .

[0064] The sealing actuator 3 is movably arranged in the second valve body 2, so that when pressure gas sufficient to move the sealing actuator 3 is introduced into the inlet port 11, the pressure gas can push the sealing actuator 3 to move to the first position, so that the inlet port 11 is fluidly connected to the outlet port 21, and at this time, the pressure gas can flow into the outlet port 21 through the inlet port 11 and be input to the patient side; when pressure gas sufficient to move the sealing actuator is not introduced into the inlet port 11, due to the absence of pressure, the sealing actuator 3 moves to the second position, so that the outlet port 21 is fluidly connected to the exhaust port 23, and at this time the fluid communication between the inlet port 11 and the outlet port 21 is blocked, so that the gas entering the pressure protection valve from the outlet port 21 will be discharged from the exhaust port 23, and will not enter the PAP device or CPAP device through the inlet port 11 to damage it.

[0065] Specifically, Figure 5-Figure 8 As shown, the second valve body 2 includes a main body 22 and an air outlet connector 28. Figure 5 As shown, one end of the main body 22 is connected to the air outlet connector 28, and the other end is used to be connected to the first valve body 1. The air outlet port 21 is arranged on the end of the air outlet connector 28 away from the main body 22.

[0066] The main body 22 is provided with a receiving groove 26 , an exhaust cavity 24 circumferentially arranged around the receiving groove 26 , and a ventilation cavity 27 circumferentially arranged around the exhaust cavity 24 . The ventilation cavity 27 is located between the air inlet port 11 and the air outlet port 21 .

[0067] Please combine Figure 2 , Fig.12 and Fig.13 The sealing actuator 3 is arranged in the receiving groove 26 and connected to the driving member in the receiving groove 26. When the pressure gas is input into the air inlet port 11, as shown in FIG. Fig.13 As shown, the sealing actuator 3 is actuated by the pressurized gas to move to the first position in the receiving groove 26; when the pressurized gas is not introduced into the air inlet port 11, the sealing actuator 3 is actuated by the driving member to move in the opposite direction to the second position in the receiving groove 26.

[0068] Among them, when the sealing actuator 3 is in the first position, the first sealing surface 31 of the sealing actuator 3 seals the exhaust chamber 24, so that the air inlet port 11 is fluidly connected with the air outlet port 21 through the ventilation chamber 27; when the sealing actuator 3 is in the second position, the second sealing surface 33 of the sealing actuator 3 seals the ventilation chamber 27, so that the fluid connection between the air inlet port 11 and the air outlet port 21 is blocked, and the exhaust chamber 24 is fluidly connected with the exhaust port 23.

[0069] The driving member mentioned above can be driven by elastic force or magnetic force to move in the opposite direction, so the driving member can be an elastic element 4 (such as Fig.11 As shown) or magnetic element, the driving member is arranged at the closed end of the receiving groove 26. Among them, the elastic element 4 is preferably a helical spring, which can make the sealing actuator 3 have a more sensitive response under the action of the non-pressure gas.

[0070] like Fig.12 and Fig.13 Please combine Figure 5 , Figure 6 , Figure 7 and Figure 8 The center of the second valve body 2 is provided with a first columnar body 201 extending along its axial direction, and a receiving groove 26 is formed inside the first columnar body 201. The first columnar body 201 can be connected to the inner wall of the second valve body 2 through a first supporting rib 203, such as Figure 7 As shown. A second columnar body 202 coaxial with the first columnar body 201 is disposed outside the first columnar body 201, and the second columnar body 202 can be connected to the inner wall of the second valve body 2 through a second supporting rib 204. The second columnar body 202 is sleeved on the first columnar body 201, so the inner wall of the second columnar body 202 and the outer wall of the first columnar body 201 jointly define the exhaust cavity 24. Therefore, the exhaust cavity 24 is constructed as a columnar structure.

[0071] The open end of the second columnar body 202 extends beyond the open end of the first columnar body 201 so as to fit with the first sealing surface 31 of the sealing actuator 3 .

[0072] The exhaust port 23 is disposed on the second valve body 2 and communicates with the exhaust cavity 24 through the exhaust passage 205. Therefore, it can be understood that the inner wall of the main body 22 and the outer wall of the second columnar body 202 define the ventilation cavity 27 together.

[0073] The second valve body 2 is provided with an air outlet connector 28 on one side away from the first valve body 1, and the air outlet connector 28 is used to connect to the breathing mask. The air outlet port 21 is provided at the end of the air outlet connector 28. When the first sealing surface 31 of the sealing actuator 3 does not block the exhaust cavity 24, the ventilation cavity 27, the exhaust cavity 24, the exhaust channel 205, the exhaust port 23, the accommodating groove 26 and the air outlet port 21 in the second valve body 2 can be in a state of fluid communication.

[0074] As mentioned above, the protection valve of the prior art generally includes three parts, namely, the valve top cover, the valve bottom cover and the valve body. The reason why the protection valve of the prior art must adopt a three-part structure is that the valve top cover, the valve bottom cover and the valve body are obtained by mold forming, and the diameter of the columnar body used to define the chamber inside the valve body is large, and the inner diameter of the air outlet end of the valve bottom cover is small. Therefore, in order to smoothly demould, the valve body, the valve bottom cover and the valve top cover must be set as a split structure, that is, the valve body, the valve bottom cover and the valve top cover are obtained separately, and then connected into a whole. In other words, in order to be feasible in terms of technology, the protection valve of the prior art can only be set to be formed by three parts.

[0075] The important difference between the pressure protection valve of the present invention and the above-mentioned existing protection valve is that the structure of the pressure protection valve of the present invention is simplified into two parts, namely the first valve body 1 and the second valve body 2, and the reason why the pressure protection valve of the present invention can be simplified into two parts is that, for example, Figure 7 As shown, in the present invention, the outer diameter D1 of the second columnar body 202 for defining the exhaust cavity 24 in the second valve body 2 is smaller than the inner diameter D2 of the outlet connector 28. Then, the outer diameter D1 of the second columnar body 202 located on the upstream side of the outlet connector 28 is set to be smaller than the inner diameter D2 of the outlet connector 28, which will not affect the demoulding of the second columnar body 202 and the outlet connector 28, so that the main body 22 of the second valve body 2 and the outlet connector 28 can be integrally arranged and can be demoulded smoothly.

[0076] Therefore, the utility model improves the structure and size of the second columnar body 202 and the air outlet connector 28 in the second valve body 2 so that the second valve body 2 of the utility model can be formed in one piece without having to be decomposed into two parts for separate molding. Thus, the utility model not only solves the problems of stability and reliability, but also ensures the feasibility of the process.

[0077] The second valve body 2 is connected to the first valve body 1 on one side close to the first valve body 1. Therefore, when pressurized gas is introduced into the air inlet port 11 of the first valve body 1, the pressurized gas can flow into the ventilation cavity 27 of the second valve body 2, and the sealing actuator 3 is acted upon by the pressure of the gas and moves toward the air outlet port 21 until the first sealing surface 31 of the sealing actuator 3 abuts against the open end of the second columnar body 202. The exhaust cavity 24 is blocked, and the fluid connection between the ventilation cavity 27 and the exhaust cavity 24 (as well as the exhaust channel 205, the exhaust port 23) and the accommodating groove 26 is blocked. Therefore, the ventilation cavity 27 is only in fluid communication with the air outlet port 21. The air inlet port 11 can be in fluid communication with the air outlet port 21 through the ventilation cavity 27. At this time, the pressurized gas in the air inlet port 11 can flow to the air outlet port 21 via the ventilation cavity 27 for output.

[0078] When no pressurized gas is introduced into the air inlet port 11, the sealing actuator 3 is acted upon by the elastic force of the elastic element 4 and moves toward the air inlet port 11 until the second sealing surface 33 of the sealing actuator 3 abuts against the connecting end surface of the first valve body 1 and the second valve body 2 (for example, the end surface 12 connecting the air inlet interface and the connecting groove described below), and the fluid connection between the air inlet port 11 and the ventilation cavity 27 is blocked, so that the gas cannot flow back to the air inlet port 11 through the ventilation cavity 27; however, at this time, since the first sealing surface 31 leaves the open end of the second columnar body 202, the exhaust cavity 24 is not blocked, and the air outlet port 21 is fluidly connected to the exhaust port 23 through the exhaust cavity 24, the ventilation cavity 27, and the exhaust channel 205, so the gas entering from the air outlet port 21 can be discharged to the outside of the second valve body 2 through the exhaust cavity 24, the ventilation cavity 27, the exhaust channel 205 and the exhaust port 23.

[0079] It can be understood that the receiving groove 26, the exhaust cavity 24 arranged around the receiving groove 26, and the ventilation cavity 27 arranged around the exhaust cavity 24 can also be constructed in other structural forms.

[0080] It is sufficient as long as it can be ensured that when the exhaust cavity 24 is blocked, the vent cavity 27 is in fluid communication with the gas outlet port 21 , and when the vent cavity 27 is blocked, the exhaust cavity 24 is in fluid communication with the exhaust port 23 and the gas outlet port 21 .

[0081] like Figure 3 and Figure 4 As shown, the sealing actuator 3 comprises a sealing disc 30, a guide rod 34 and a positioning rib 35. Two opposite side walls of the sealing disc 30 are a first sealing surface 31 and a second sealing surface 33 respectively.

[0082] The guide rod 34 extends from the first sealing surface 31 and is used to cooperate with the receiving groove 26. One end of the guide rod 34 is connected to the driving member. When the driving member is an elastic element 4, the guide rod 34 can be made of a flexible material, and its end is connected to the elastic element to ensure the axial movement of the guide rod 34 in the receiving groove 26. It can be understood that when the driving member is a magnetic element, the guide rod can be made of a metal material to generate a magnetic repulsive force with the magnetic element.

[0083] It can be understood that the pressure gas mentioned above that is sufficient to move the sealing actuator means that the pressure applied by the pressure gas on the sealing disk 30 (second sealing surface 33) is greater than the elastic force applied by the elastic element 4 on the guide rod 34 or the magnetic repulsion force applied by the magnetic element on the guide rod 34, so that the pressure gas can push the sealing actuator 3 to move to the first sealing surface 31 to seal the exhaust chamber 24.

[0084] The positioning ribs 35 are arranged on the circumferential side wall of the guide rod 34 and extend along the axial direction of the guide rod 34. There are multiple positioning ribs 35, and the multiple positioning ribs 35 are arranged at intervals along the circumference of the guide rod 34. Figure 6 As shown, the receiving groove 26 is provided with a plurality of notches 261 extending along its axial direction. Figure 4 As shown, three positioning ribs 35 are arranged at equal intervals on the circumference of the guide rod 34; Figure 6 As shown, three notches 261 are also arranged at equal intervals on the circumference of the receiving groove 26, and when the guide rod 34 is matched with the receiving groove 26, the positioning rib 35 is matched with the corresponding notch 261. The matching between the positioning rib 35 and the corresponding notch 261 can ensure that the sealing actuator 3 moves substantially along the axial direction without deflection.

[0085] like Figure 3 As shown, the first sealing surface 31 is also provided with a conical protrusion 32 protruding toward the air inlet port 11. The conical protrusion 32 has an aerodynamic curve, which can reduce the flow resistance, so that when the sealing actuator 3 is in the first position, the pressurized gas can seal the disk 30, surround the ventilation cavity 27 and flow out through the air outlet port 21.

[0086] The circumferential outer wall of the main body 22 is provided with anti-skid ribs 221 extending along the circumference thereof, and the number of the anti-skid ribs 221 is multiple, and the multiple anti-skid ribs 221 are arranged at intervals along the circumference of the main body 22. The anti-skid ribs 221 can provide gripping friction when connecting or disassembling the first valve body 1 and the second valve body 2, thereby improving the convenience of installation and disassembly.

[0087] like Figure 5 As shown, the main body 22 can be connected to the air outlet joint 28 through the tapered portion 25. The exhaust port 23 can be provided on the main body 22 and / or the tapered portion 25, and the number of the exhaust ports 23 is multiple, and the multiple exhaust ports 23 are arranged at intervals along the circumference of the main body 22. In this embodiment 1, the exhaust ports 23 are arranged in two, which are symmetrically arranged along the radial direction of the main body 22.

[0088] like Fig. 9 and Fig.10 As shown, the first valve body 1 includes an air inlet interface 14 and a connecting groove 13, and the air inlet port 11 and the connecting groove 13 are respectively arranged at two ends of the air inlet interface 14 and are fluidically connected through the air inlet interface 14. Fig.10 As shown, the air inlet port 14 is in fluid communication with the connecting groove 13 at the end surface 12 where the air inlet port and the connecting groove are in communication.

[0089] like Fig.10As shown, the diameter of the connecting groove 13 is larger than the diameter of the air inlet interface 14 to accommodate a portion of the second valve body 2, and the end of the second valve body 2 abuts against the bottom wall of the connecting groove 13 to achieve an airtight connection between the first valve body 1 and the second valve body 2. Therefore, when the sealing actuator 3 is located at the second position, the second sealing surface 33 of the sealing actuator 3 abuts against the end surface 12 of the air inlet interface communicating with the connecting groove, thereby sealing the ventilation cavity 27, so that the fluid communication between the air inlet port 11 and the ventilation cavity 27 is blocked.

[0090] Example 2

[0091] like Figure 14-17 As shown, based on the above-mentioned embodiment 1, the difference between this embodiment 2 and the above-mentioned embodiment 1 is that the circumferential outer wall of the main body 22 is provided with anti-slip ribs 221 extending along its axial direction, and the number of the anti-slip ribs 221 is multiple, and the multiple anti-slip ribs 221 are arranged at intervals along the circumference of the main body 22.

[0092] In addition, the difference between the second embodiment and the first embodiment is that the number of exhaust ports 23 can be three, which can be arranged on the main body 22. Fig.15 As shown, the center of the second valve body 2 is also provided with a first columnar body 201 extending along its axial direction, and the interior of the second columnar body 202 forms a receiving groove 26. The first columnar body 201 can be connected to the inner wall of the second valve body 2 through a first supporting rib 203, as shown in FIG. Fig.16 shown.

[0093] The first columnar body 201 is provided with a coaxial second columnar body 202 outside thereof, and the second columnar body 202 can be connected to the inner wall of the second valve body 2 through a second support rib 204. The second support rib 204 diverges radially outward from the circumferential side wall of the second columnar body 202. The second columnar body 202 is sleeved on the first columnar body 201, so the inner wall of the second columnar body 202 and the outer wall of the first columnar body 201 jointly define the exhaust cavity 24. Therefore, the exhaust cavity 24 formed can also be a columnar structure. An exhaust channel 205 can be constructed in the second support rib 204, one end of which is connected to the exhaust cavity 24, and the other end is connected to the exhaust port 23 on the outer wall of the main body 22. The inner wall of the main body 22 and the outer wall of the second columnar body 202 jointly define the ventilation cavity 27.

[0094] Therefore, if Fig.17 As shown, when the sealing actuator 3 is in the first position, its first sealing surface 31 abuts against the open end of the second columnar body 202 , thereby sealing the exhaust cavity 24 , so that the pressurized gas can flow through the air inlet port 11 via the vent cavity 27 to the air outlet port 21 .

[0095] The similarities between this embodiment 2 and the above-mentioned embodiment 1 will not be repeated again.

[0096] Example 3

[0097] like Fig.18 , Fig.19 , Fig. 20 and Fig.21 As shown, based on the above-mentioned embodiment 2, the difference between the present embodiment 3 and the above-mentioned embodiment 2 is that the exhaust cavity 24 is configured as a conical structure with a diameter increasing in a direction away from the gas outlet port 21. For example, the inside of the second columnar body 202 can be set as an inclined inner wall, so the exhaust cavity 24 defined by the inner wall of the second columnar body 202 and the outer wall of the first columnar body 201 can form a conical structure.

[0098] like Fig.21 As shown, when the sealing actuator 3 is in the first position, its first sealing surface 31 abuts against the open end of the second columnar body 202, thereby blocking the exhaust cavity 24, so that the pressurized gas can flow to the exhaust port 21 through the inlet port 11 via the vent cavity 27. Since the exhaust cavity 24 is a conical structure, it can provide a larger ventilation area, reducing the gas resistance when the pressure protection valve is ventilated.

[0099] The similarities between this embodiment 3 and the above-mentioned embodiment 2 will not be repeated again.

[0100] Example 4

[0101] like Fig. 22 and Fig.23 As shown, based on the above-mentioned embodiment 3, the difference between this embodiment 4 and the above-mentioned embodiment 2 is that the main body 22 is connected to the air outlet connector 28 through the plane portion 29, so that the pressure protection valve can have a smaller and more refined appearance.

[0102] The similarities between this embodiment 4 and the above-mentioned embodiment 3 will not be repeated again.

[0103] Example 5

[0104] According to the second aspect of the utility model, the utility model provides a positive airway pressure ventilation (PAP) device, including an airflow generating device and a breathing mask connected by fluid, and the breathing mask is used to be worn on the face of a user. The positive airway pressure ventilation device of the utility model also includes the pressure protection valve described in one or more of the above-mentioned embodiments 1, 2, 3 and 4, and the pressure protection valve is arranged on the pipeline between the airflow generating device and the breathing mask. By arranging the pressure protection valve, the pressure gas in the airflow generating device can only flow unidirectionally to the breathing mask, and will not flow back to the airflow generating device.

[0105] In addition, the positive airway pressure ventilation device may also include a humidifier, which is arranged between the pressure protection valve and the breathing mask. The gas output by the airflow generating device passes through the pressure protection valve and enters the humidifier for humidification. The humidified gas can be passed into the breathing mask to improve the comfort of use.

[0106] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pressure protection valve, characterized in that: It comprises a first valve body and a second valve body, wherein the first valve body and the second valve body are fixedly connected, the first valve body comprises an air inlet port, and the second valve body comprises an air outlet port and an exhaust port; Wherein, a sealing actuator is provided in the second valve body or between the first valve body and the second valve body, the sealing actuator is located between the air inlet port and the air outlet port, and the sealing actuator is configured to move to a first position when a force is applied through the air inlet port; and move to a second position when no force is applied through the air inlet port; The first position is a position where the air inlet port is in fluid communication with the air outlet port, and the second position is a position where the air outlet port is in fluid communication with the exhaust port.

2. The pressure protection valve according to claim 1, characterized in that: The second valve body comprises a receiving groove, an exhaust cavity arranged around the receiving groove, and a vent cavity arranged around the exhaust cavity, wherein the vent cavity is located between the air inlet port and the air outlet port, and the sealing actuator is arranged in the receiving groove and connected to the driving member in the receiving groove; When the pressure gas sufficient to move the sealing actuator is input into the air inlet port, the sealing actuator is actuated by the pressure gas to move to the first position in the receiving groove; when the pressure gas sufficient to move the sealing actuator is not input into the air inlet port, the sealing actuator is actuated by the driving member to move in the opposite direction to the second position in the receiving groove; Wherein, when the sealing actuator is located in the first position, the first sealing surface of the sealing actuator seals the exhaust cavity, and the air inlet port is fluidly connected with the air outlet port through the ventilation cavity; when the sealing actuator is located in the second position, the second sealing surface of the sealing actuator seals the ventilation cavity, and the exhaust cavity is fluidly connected with the exhaust port.

3. The pressure protection valve according to claim 2, characterized in that: The driving member is an elastic element or a magnetic element, and the driving member is arranged at the closed end of the accommodating groove.

4. The pressure protection valve according to claim 2 or 3, characterized in that: The sealing actuator comprises: A sealing disk, wherein two opposite side walls thereof are respectively a first sealing surface and a second sealing surface; a guide rod extending from the first sealing surface and adapted to cooperate with the receiving groove, wherein one end of the guide rod is connected to the driving member; and A positioning rib, which is arranged on the circumferential side wall of the guide rod and extends along the axial direction of the guide rod, and the number of the positioning ribs is multiple, and the multiple positioning ribs are respectively arranged at intervals along the circumference of the guide rod; The receiving groove is provided with a plurality of notches extending along its axial direction, and when the guide rod is matched with the receiving groove, the positioning rib is matched with the corresponding notches.

5. The pressure protection valve according to claim 2 or 3, characterized in that: The first sealing surface is also provided with a conical protrusion protruding toward the air inlet port.

6. The pressure protection valve according to claim 2 or 3, characterized in that: The exhaust cavity is configured as a columnar structure or a conical structure whose diameter increases in a direction away from the exhaust port.

7. The pressure protection valve according to claim 1 or 2, characterized in that: The second valve body includes a main body, and anti-skid ribs extending circumferentially or axially are arranged on the circumferential outer wall of the main body. The number of the anti-skid ribs is multiple, and the multiple anti-skid ribs are arranged at intervals along the circumference of the main body.

8. The pressure protection valve according to claim 7, characterized in that: The second valve body further comprises an air outlet connector, the air outlet port is arranged on the air outlet connector, and the main body is connected to the air outlet connector via a flat portion or a conical portion.

9. The pressure protection valve according to claim 8, characterized in that: The exhaust port is arranged on the main body and / or the tapered portion, and there are multiple exhaust ports, which are arranged at intervals along the circumference of the main body.

10. The pressure protection valve according to claim 2 or 3, characterized in that: The first valve body comprises an air inlet interface and a connecting groove, the air inlet port and the connecting groove are respectively arranged at two ends of the air inlet interface and are fluidly connected through the air inlet interface, the connecting groove accommodates a part of the second valve body, and an end of the second valve body abuts against a bottom wall of the connecting groove; Wherein, when the sealing actuator is located at the second position, the second sealing surface of the sealing actuator abuts against the end surface of the air inlet interface communicating with the connecting groove to seal the ventilation cavity.

11. A positive airway pressure device, characterized in that: The invention comprises an airflow generating device and a breathing mask which are fluidly connected, and further comprises a pressure protection valve according to any one of claims 1 to 10, wherein the pressure protection valve is arranged on a pipeline between the airflow generating device and the breathing mask.

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