A pressure relief valve

Abstract

The application discloses a pressure relief valve, comprising: a fixed assembly installed on an oxygen cabin and provided with a threaded hole; an upper knob part, comprising a threaded section and an upper cover knob arranged at one end of the threaded section, the threaded section being provided with a pressure relief hole, a first radial hole and a second radial hole, the first radial hole and the second radial hole being arranged at intervals along the axial direction of the pressure relief hole; the upper cover knob being provided with a mounting groove in communication with the pressure relief hole; a hole plate, installed in the mounting groove and provided with an air outlet hole; a wheel disc, rotatably installed between the hole plate and the groove bottom of the mounting groove about the central axis of the wheel disc, used for controlling the opening degree of the air outlet hole; wherein, when the fixed assembly is located between the first radial hole and the second radial hole, the oxygen cabin is subjected to emergency pressure relief; when the second radial hole is located in the threaded hole, rotating the wheel disc can realize the adjustment of the pressure relief speed. According to the pressure relief valve, the pressure relief speed can be adjusted, and the pressure relief valve has an emergency pressure relief mode; the mode for adjusting the pressure relief speed is simple and suitable for various groups of people; the pressure relief valve can realize silent pressure relief and has good comfort.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oxygen cabin equipment, and in particular to a pressure relief valve. BACKGROUND

[0002] With the development of modern medicine, the beneficial effects of hyperbaric oxygen chambers on the human body are becoming more and more prominent. Studies have shown that hyperbaric oxygen chambers have significant effects on the prevention and treatment of cardiovascular and cerebrovascular diseases. With the advancement of technology, the cost of manufacturing hyperbaric oxygen chambers has been decreasing year by year, and hyperbaric oxygen chambers and equipment have shifted from luxury goods to daily necessities and are gradually accepted by ordinary consumers.

[0003] The amount of oxygen carried by blood is proportional to the pressure. When the ambient pressure increases, it helps to increase the oxygen-carrying capacity of the blood, thereby improving the metabolism of various organs in the human body. The mechanism of action of hyperbaric oxygen chambers can be simply described as follows: a closed space is artificially created, the internal pressure is increased to be higher than the atmospheric pressure, and when a person is in it, the oxygen-carrying capacity of the blood in the body will increase. This closed space is called an oxygen chamber. The basic function of the oxygen chamber is to provide changes in internal pressure. The process of changing the internal pressure of the oxygen chamber includes normal pressure, pressurization, stable pressure, pressure relief, and normal pressure. In the above process, more effort is put into the pressurization and stable pressure stages, and there are more related valve components and products on the market. However, most of them ignore the pressure relief process, and there are relatively few corresponding pressure relief valve products.

[0004] To ensure comfort, the pressurization and stable pressure processes need to ensure smooth pressure transition and avoid sudden pressure increases and decreases. Similarly, during the pressure relief stage, the pressure should also be released smoothly. Most existing oxygen chamber pressure relief valves use threaded connections and only have simple opening and closing functions. The opening size is not easy to control, that is, they only have a simple pressure relief function. This results in poor pressure control during pressure relief, which can cause discomfort to the experimenter. Moreover, since there is no silencing device, the pressure relief valve often produces a whistling sound during pressure relief. At the same time, it should be noted that this rotating thread type usually achieves switching. Due to the presence of the thread pair and the presence of a certain air pressure in the cabin, a larger force is required to initially rotate the knob, which poses a safety hazard to the weak. SUMMARY

[0005] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application proposes a pressure relief valve that can adjust the pressure relief speed and retain an emergency pressure relief mode. The pressure relief speed adjustment method is simple and easy to operate, and is suitable for various groups of people.

[0006] According to an embodiment of the present application, a pressure relief valve comprises: a fixed component installed in an oxygen cabin, the fixed component being provided with a threaded hole communicating the inside and outside of the oxygen cabin; an upper knob component comprising a threaded segment and an upper cover knob provided at one end of the threaded segment, the threaded segment being provided with a pressure relief hole and first and second radial holes communicating with the pressure relief hole, the first and second radial holes being arranged along the axial direction of the pressure relief hole; the upper cover knob being provided with a mounting groove communicating with the pressure relief hole; a hole plate installed in the mounting groove and provided with an air outlet hole; a wheel disc rotatably installed between the hole plate and the groove bottom of the mounting groove for controlling the opening degree of the air outlet hole; wherein the fixed component is located between the first and second radial holes to perform emergency pressure relief for the oxygen cabin; and when the second radial hole is located in the threaded hole, rotating the wheel disc can adjust the pressure relief speed.

[0007] According to the pressure relief valve of the present application, at least the following beneficial effects are achieved:

[0008] The first and second radial holes and the interval therebetween are larger than the thickness of the fixed component, so that the pressure relief valve has emergency pressure relief capability; the hole plate and the wheel disc capable of relative rotation with the hole plate are provided, so that the pressure relief rate can be adjusted during normal pressure relief, greatly improving the comfort of the user; the wheel disc is not threadedly connected with the upper knob component, and the wheel disc can still be easily rotated when there is air pressure in the oxygen cabin, so that people of all ages can easily perform pressure relief under any circumstances.

[0009] According to some embodiments of the present application, the hole plate is provided with an annular groove at the outer periphery, and a limiting bolt is threadedly connected with the side wall of the mounting groove, the limiting bolt being capable of being partially embedded in the annular groove to communicate the hole plate and the upper cover knob.

[0010] According to some embodiments of the present application, the wheel disc is provided with a plurality of adjustment holes of different diameters at intervals around the circumference, and rotating the wheel disc can align the adjustment holes of different diameters with the air outlet hole to adjust the opening degree of the air outlet hole.

[0011] According to some embodiments of the present application, a sound attenuation structure is installed in the air outlet hole.

[0012] According to some embodiments of the present application, the side of the wheel disc away from the hole plate is provided with an outwardly extending retaining ring, and the end of the retaining ring is in contact with the groove bottom of the mounting groove to form a gap between the wheel disc and the groove bottom of the mounting groove for air flow.

[0013] According to some embodiments of the present application, an outer knob is connected with the wheel disc to drive the rotation of the wheel disc, the outer knob being partially provided in the hole plate and being in transmission connection with the wheel disc.

[0014] According to some embodiments of the present application, the outer knob is provided with a connecting rod extending towards one side, the hole plate is provided with a through hole for the connecting rod to pass through, the wheel disc is provided with an embedding block towards one side of the hole plate, the end of the connecting rod is provided with a clamping groove, and the embedding block is embedded in the clamping groove and connected with the connecting rod through a screw.

[0015] According to some embodiments of the present application, the pressure relief hole penetrates the upper knob part, and the wheel disc is connected with an inner knob sealing one end of the pressure relief hole located in the oxygen cabin.

[0016] According to some embodiments of the present application, the wheel disc is provided with a central rod extending towards one side, the central rod penetrates the pressure relief hole, the inner knob is connected to the end of the central rod and sealingly connected with one end of the pressure relief hole located in the oxygen cabin, and the outer peripheral wall of the central rod has a gap with the inner peripheral wall of the pressure relief hole.

[0017] According to some embodiments of the present application, the lower cover knob is connected to the end of the upper cover knob away from the threaded section, the lower cover knob is provided with a cylindrical groove, and the inner knob is installed in the cylindrical groove.

[0018] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be understood through practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described below in conjunction with the drawings and embodiments, in which:

[0020] Figure 1 Structure schematic diagram of the embodiment of the present application in the adjustable pressure relief state;

[0021] Figure 2 Structure schematic diagram of the embodiment of the present application in the emergency pressure relief state;

[0022] Figure 3 Structure exploded view of the embodiment of the present application;

[0023] Figure 4 Structure exploded view of the embodiment of the present application from another angle.

[0024] Reference numerals:

[0025] Fixed assembly 100, threaded hole 110, first connecting part 120, second connecting part 130;

[0026] Upper knob part 200, threaded section 210, pressure relief hole 211, first radial hole 212, second radial hole 213, upper cover knob 220, installation groove 221, limiting bolt 222, lower cover knob 230, cylindrical groove 231, connecting bolt 232, stop block 233;

[0027] Orifice plate 300, air outlet hole 310, ring groove 320, through hole 330, sound attenuation structure 340;

[0028] Wheel disc 400, adjusting hole 410, blocking ring 420, embedded block 430, center rod 440, center screw hole 441, limiting groove 442;

[0029] Outer knob 500, connecting rod 510, clamping groove 511;

[0030] Inner knob 600, through hole 610, cylindrical segment 620, limiting block 630, locking bolt 640, positioning block 650. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, for the purpose of explaining the present application, and should not be understood as a limitation of the present application.

[0032] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as a limitation of the present application.

[0033] In the description of the present application, the plural refers to two or more. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.

[0034] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0035] Referring to Figures 1 to 4 , a pressure relief valve of an embodiment of the present application comprises a fixed assembly 100 mounted in an oxygen cabin, an upper knob member 200 penetrating the fixed assembly 100, an orifice plate 300 and a wheel disc 400 mounted in the upper knob member 200.

[0036] Referring to Figure 1 , Figure 2As shown, the fixing assembly 100 consists of a first connector 120 and a second connector 130. The first connector 120 has a threaded hole 110 at its center, connecting the interior and exterior of the oxygen chamber, and external threads on its outer peripheral wall. The second connector 130 is threaded onto the first connector 120. The first connector 120 can be understood as a hollow bolt, and the second connector 130 as a nut.

[0037] Reference Figure 1 , Figure 2 As shown, the upper knob component 200 includes a threaded section 210 and an upper cover knob 220 located at one end of the threaded section 210. The upper cover knob 220 and the threaded section 210 are fixedly connected. The threaded section 210 has a pressure relief hole 211 and a first radial hole 212 and a second radial hole 213 communicating with the pressure relief hole 211. The first radial hole 212 and the second radial hole 213 are spaced apart along the axial direction of the pressure relief hole 211. Both the first radial hole 212 and the second radial hole 213 communicate with the pressure relief hole 211 in the radial direction. The first radial hole 212 is located at the end of the threaded section 210 away from the upper cover knob 220, and the second radial hole 213 is located at the end of the threaded section 210 close to the upper cover knob 220. The upper cover knob 220 has a mounting groove 221 communicating with the pressure relief hole 211. The perforated plate 300 and the wheel 400 are both installed in the mounting groove 221. Both the orifice plate 300 and the wheel 400 are cylindrical, and their diameters are the same as the inner diameter of the mounting groove 221.

[0038] The orifice plate 300 is provided with an air outlet 310, which is located at an eccentric position on the orifice plate 300. A wheel 400 is rotatably mounted between the orifice plate 300 and the bottom of the mounting groove 221 around its own central axis, used to control the opening degree of the air outlet 310. Specifically, the wheel 400 has multiple adjusting holes 410 of different diameters spaced around its circumference. Rotating the wheel 400 aligns the adjusting holes 410 of different diameters with the air outlet 310, thereby adjusting the opening degree of the air outlet 310. (Refer to...) Figure 3 , Figure 4 As shown, the centers of multiple adjustment holes 410 are on the same circle. By rotating the wheel 400 to control the overlap area between the adjustment holes 410 and the air outlet 310, the depressurization rate can be adjusted. In addition, the wheel 400 can also completely close the air outlet 310 to maintain the stability of the air pressure in the oxygen chamber.

[0039] In some specific embodiments of the present invention, a silencing structure 340 is installed inside the vent 310. The silencing structure 340, installed inside the vent 310, can significantly reduce the whistling noise generated by the rapid airflow when the airflow in the oxygen chamber passes through the vent 310, thereby further improving comfort during depressurization. The silencing structure can take various forms, such as a wind grille or sound-absorbing cotton.

[0040] In some embodiments of the present application, the fixed assembly 100 is located between the first radial hole 212 and the second radial hole 213 to perform emergency decompression of the oxygen cabin; when the upper cover knob 220 abuts against the fixed assembly 100, the rotating wheel 400 can adjust the decompression speed. It should be noted that, as shown in Figure 1 、 Figure 2 the upper cover knob 220 is provided with a groove near the outer periphery of the threaded section 210, and a sealing ring is arranged in the groove; when the bottom of the upper cover knob 220 abuts against the first fixed frame, the second radial hole 213 is located in the threaded hole 110, and since the upper cover knob 220 is in sealing connection with the first connecting piece 120, the gas in the oxygen cabin cannot escape through the second radial hole 213, and thus can only escape through the rotating wheel 400 and the hole plate 300, so that the rotating wheel 400 can adjust the decompression speed.

[0041] It can be understood that, if the groove is not arranged on the upper cover knob 220 to place the sealing ring, when the second radial hole 213 is located in the threaded hole 110, the threaded hole 110 can also block part of the gas from escaping, and the rotating wheel 400 can also adjust the decompression speed; however, since the thread cannot achieve good sealing, the second radial hole 213 will always be in a state of gas leakage, thereby increasing the power consumption of the oxygen cabin.

[0042] Figure 1 As shown in the figure, it is a schematic view of the decompression valve in the adjustable decompression state; at this time, the gas in the oxygen cabin enters the decompression hole 211 from the first radial hole 212, and then escapes after passing through the rotating wheel 400 and the hole plate 300.

[0043] Figure 2 As shown in the figure, it is a schematic view of the decompression valve in the emergency decompression state; at this time, the gas in the oxygen cabin enters the decompression hole 211 from the first radial hole 212, and then escapes from the second radial hole 213; since there is no obstruction in the middle, and the diameters of the first radial hole 212 and the second radial hole 213 are not small, the rapid decompression of the oxygen cabin can be achieved.

[0044] In some embodiments of the present application, the hole plate 300 is provided with a ring groove 320, and the limiting bolt 222 is threadedly connected to the side wall of the mounting groove 221; the limiting bolt 222 can be partially embedded in the ring groove 320 to connect the hole plate 300 and the upper cover knob 220. Specifically, as shown in Figure 1 、 Figure 4 the side wall of the mounting groove 221 is provided with a screw hole for the limiting bolt 222 to pass through; during installation, the rotating wheel 400 is first installed in the mounting groove 221, and then the hole plate 300 is installed; at this time, the ring groove 320 of the hole plate 300 is aligned with the height screw hole of the mounting groove 221, and the limiting bolt 222 can be screwed in at this time.

[0045] It is conceivable that the outer peripheral wall of the annular groove 320 can also be provided with a threaded hole for the limiting bolt 222 to pass through, but the threaded hole is not easy to align compared with the annular groove 320, and the installation of the annular groove 320 can more efficiently achieve the installation of the hole plate 300.

[0046] In some embodiments of the present application, the side of the wheel disc 400 facing away from the hole plate 300 is provided with an outwardly extending retaining ring 420, the end of the retaining ring 420 is in contact with the groove bottom of the mounting groove 221 to form a gap between the wheel disc 400 and the groove bottom of the mounting groove 221 for the gas flow to pass through. Specifically, during normal pressure relief, the gas in the oxygen cabin enters the pressure relief hole 211 through the first radial hole 212, then enters the retaining ring 420, and finally escapes through the wheel disc 400 and the hole plate 300.

[0047] In some embodiments of the present application, the wheel disc 400 is connected with an outer knob 500 for driving the rotation of the wheel disc 400, the outer knob 500 is partially provided in the hole plate 300 and is in transmission connection with the wheel disc 400. Specifically, referring to Figure 3 、 Figure 4 As shown in the figure, the outer knob 500 is provided with a connecting rod 510 extending to one side, the hole plate 300 is provided with a through hole 330 in the center for the connecting rod 510 to pass through, the wheel disc 400 is provided with an embedded block 430 on the side facing the hole plate 300, the end of the connecting rod 510 is provided with a clamping groove 511, the embedded block 430 is embedded in the clamping groove 511 and is connected with the connecting rod 510 through a screw.

[0048] Further, the outer periphery of the connecting rod 510 is also provided with a groove for installing a sealing ring, the connecting rod 510 is inserted into the through hole 330 and is in sealing connection with the through hole 330. The through hole 330 is arranged at the center position of the hole plate 300, the embedded block 430 is arranged at the center position of the wheel disc 400, and the connecting rod 510 is arranged at the center position of the outer knob 500. The side of the outer knob 500 facing away from the hole plate 300 is provided with a protruding cross plate to facilitate the rotation of the outer knob 500.

[0049] In some embodiments of the present application, the bottom of the clamping groove 511 is provided with a threaded hole, the center position of the embedded block 430 is provided with a through hole corresponding to the threaded hole, and the screw is screwed into the threaded hole at the bottom of the clamping groove 511 through the embedded block 430 to connect the wheel disc 400 and the outer knob 500.

[0050] It is conceivable that the embedded block 430 can also be arranged on the outer knob 500, and the clamping groove 511 can be arranged on the wheel disc 400.

[0051] It should be noted that the diameter of the outer knob 500 should be avoided to be large enough to prevent the outer knob 500 from blocking the gas outlet hole 310 when the outer knob 500 is pressed on the hole plate 300; or a protrusion is arranged on the side of the outer knob 500 facing the hole plate 300 to abut against the hole plate 300, so that the outer knob 500 will not be directly pressed on the hole plate 300.

[0052] In some embodiments of the present application, the pressure relief hole 211 penetrates the upper knob 200, and the inner knob 600 is connected to the wheel disc 400 to seal the end of the pressure relief hole 211 inside the oxygen cabin. Specifically, the purpose of the upper knob 200 is to achieve convenient adjustment of the pressure relief rate from the inside of the oxygen cabin to obtain a better feeling.

[0053] It can be understood that the upper knob 200 can not be provided, and the pressure relief hole 211 can be directly provided without penetrating the upper knob 200, and the opening of the pressure relief hole 211 is directed away from the side of the oxygen cabin.

[0054] In some embodiments of the present application, the wheel disc 400 is provided with a center rod 440 extending to one side, the center rod 440 is provided in the pressure relief hole 211, the inner knob 600 is connected to the end of the center rod 440 and is in sealing connection with the end of the pressure relief hole 211 inside the oxygen cabin; the outer peripheral wall of the center rod 440 and the inner peripheral wall of the pressure relief hole 211 have a gap therebetween. Referring to Figure 1 、 Figure 2 、 Figure 4 As shown in the drawings, the diameter of the center rod 440 is smaller than the diameter of the pressure relief hole 211, so as to facilitate the flow of gas between the outer peripheral wall of the center rod 440 and the inner peripheral wall of the pressure relief hole 211. The center rod 440 is provided at the center position of the wheel disc 400.

[0055] In some specific embodiments of the present application, the inner knob 600 is in transmission connection with the center rod 440 and is connected through a locking bolt 640. Referring to Figure 3 、 Figure 4 As shown in the drawings, the end of the center rod 440 away from the wheel disc 400 is provided with a center screw hole 441, and the end of the center rod 440 away from the wheel disc 400 is provided with a limiting groove 442; the side of the inner knob 600 facing the center rod 440 is provided with a protruding cylindrical segment 620, the cylindrical segment 620 is provided at the center position of the inner knob 600, and the end of the cylindrical segment 620 is provided with a limiting block 630 corresponding to the limiting groove 442. The side of the inner knob 600 away from the center rod 440 is provided with a cross plate consistent with the outer knob 500 to facilitate rotation, and the center of the inner knob 600 is further provided with a through hole 610 penetrating the inner knob 600 and the cylindrical segment 620, and the locking bolt 640 penetrates the through hole 610 and is in threaded connection with the center screw hole 441.

[0056] It should be noted that the cylindrical segment 620 is inserted into the pressure relief hole 211 to position the inner knob 600.

[0057] In some embodiments of the present application, the threaded segment 210 is connected with a lower cap knob 230 at one end away from the upper cap knob 220, the lower cap knob 230 is provided with a cylindrical groove 231, and the inner knob 600 is installed in the cylindrical groove 231. Specifically, the lower cap knob 230 is sleeved on the end of the threaded segment 210, the groove bottom of the cylindrical groove 231 is flush with the one end of the threaded segment 210 away from the upper cap knob 220; the lower cap knob 230 and the threaded segment 210 are connected by a connecting bolt 232 which penetrates the lower cap knob 230 in the radial direction and abuts against the threaded segment 210, and the lower cap knob 230 and the threaded segment 210 connected by the connecting bolt 232 can be rotated synchronously when the upper knob 200 is rotated.

[0058] In some specific embodiments of the present application, the purpose of providing the lower cap knob 230 is to facilitate the rotation of the upper knob 200 from the inside of the oxygen cabin, so that the pressure relief valve can also be rotated to the emergency pressure relief state from the inside.

[0059] In some embodiments of the present application, the side of the inner knob 600 facing the lower cap knob 230 is further provided with a positioning block 650, and the lower cap knob 230 is provided with a stop block 233 to block the positioning block 650, so as to position the rotation end point of the inner knob 600. The positioning block 650 is arranged on the outer periphery of the cylindrical segment 620, and the stop block 233 protrudes from the groove bottom of the cylindrical groove 231. The positioning block 650 and the stop block 233 work as follows: for example, when the inner knob 600 is rotated clockwise to the position where it contacts the stop block 233, the pressure relief valve is completely closed; when the inner knob 600 is rotated counterclockwise to the position where it contacts the stop block 233, the pressure relief valve has the fastest pressure relief speed; and in the case that the rotation direction of the pressure relief valve or the oxygen cabin is marked, the adjustment of the pressure relief speed can be better and more convenient.

[0060] According to the pressure relief valve of the embodiments of the present application, the first radial hole 212 and the second radial hole 213, and the interval between the first radial hole 212 and the second radial hole 213 being greater than the thickness of the fixing assembly 100, enable the pressure relief valve to have the emergency pressure relief capability; the hole plate 300 and the wheel disc 400 capable of rotating relative to the hole plate 300 are provided, so that the pressure relief rate can be adjusted during normal pressure relief, greatly improving the comfort of the experimenter; the wheel disc 400 is not threadedly connected with the upper knob 200, and the wheel disc 400 can still be easily rotated when there is gas pressure in the oxygen cabin, so that all kinds of people can easily realize pressure relief in any case, and the mute structure is provided, which can effectively avoid the whistling sound generated during the pressure relief process.

[0061] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge range of ordinary skilled in the art without departing from the purpose of the present application.

Claims

1. A pressure relief valve characterized by, The utility model relates to an emergency pressure relief device for oxygen cabin, comprising: a fixed assembly (100) installed in the oxygen cabin, the fixed assembly (100) is provided with a threaded hole (110) communicating the inside and outside of the oxygen cabin; an upper knob part (200) comprising a threaded segment (210) and an upper cover knob (220) provided at one end of the threaded segment (210), the threaded segment (210) is provided with a pressure relief hole (211) and a first radial hole (212) and a second radial hole (213) communicating with the pressure relief hole (211), the first radial hole (212) and the second radial hole (213) are arranged at intervals along the axial direction of the pressure relief hole (211); the upper cover knob (220) is provided with a mounting groove (221) communicating with the pressure relief hole (211); a hole plate (300) installed in the mounting groove (221) and provided with an air outlet hole (310); a wheel disc (400) rotatably installed between the hole plate (300) and the bottom of the mounting groove (221) around its central axis for controlling the opening degree of the air outlet hole (310); wherein, when the fixed assembly (100) is located between the first radial hole (212) and the second radial hole (213), the oxygen cabin is subjected to emergency pressure relief; when the second radial hole (213) is located in the threaded hole (110), rotating the wheel disc (400) can adjust the pressure relief speed.

2. A pressure relief valve according to claim 1, characterized in that: The hole plate (300) is provided with an annular groove (320) on its outer periphery, the mounting groove (221) is provided with a limiting bolt (222) threadedly connected to its side wall, and the limiting bolt (222) can be partially embedded in the annular groove (320) to communicate the hole plate (300) and the upper cover knob (220).

3. A pressure relief valve according to claim 1, wherein: The wheel disc (400) is provided with a plurality of adjusting holes (410) of different diameters at intervals around its circumference, and rotating the wheel disc (400) can align the adjusting holes (410) of different diameters with the air outlet hole (310) to adjust the opening degree of the air outlet hole (310).

4. A pressure relief valve according to claim 1, wherein: The air outlet hole (310) is provided with a sound attenuation structure (340) installed therein.

5. A pressure relief valve according to claim 1, wherein: The wheel disc (400) is provided with an outwardly extending retaining ring (420) on the side opposite to the hole plate (300), and the end of the retaining ring (420) is in contact with the bottom of the mounting groove (221) to form a gap for air flow between the wheel disc (400) and the bottom of the mounting groove (221).

6. A pressure relief valve according to claim 1, wherein: The wheel disc (400) is connected with an outer knob (500) for driving its rotation, and the outer knob (500) is partially provided in the hole plate (300) and is in transmission connection with the wheel disc (400).

7. A pressure relief valve according to claim 6, wherein: The outer knob (500) is provided with a connecting rod (510) extending to one side, the hole plate (300) is provided with a through hole (330) for the connecting rod (510) to pass through, the wheel disc (400) is provided with an embedded block (430) on the side facing the hole plate (300), the end of the connecting rod (510) is provided with a clamping groove (511), and the embedded block (430) is embedded in the clamping groove (511) and is connected with the connecting rod (510) through a screw.

8. A pressure relief valve according to claim 1, wherein: The pressure relief hole (211) penetrates the upper knob part (200), and the wheel disc (400) is connected with an inner knob (600) sealing one end of the pressure relief hole (211) in the oxygen cabin.

9. A pressure relief valve according to claim 8, wherein: The wheel disc (400) is provided with a center rod (440) extending to one side, the center rod (440) penetrates the pressure relief hole (211), the inner knob (600) is connected to the end of the center rod (440) and is in sealing connection with the one end of the pressure relief hole (211) in the oxygen cabin; the outer peripheral wall of the center rod (440) and the inner peripheral wall of the pressure relief hole (211) have a gap.

10. A pressure relief valve according to claim 9, wherein: The end of the threaded section (210) away from the upper cover knob (220) is connected with a lower cover knob (230), the lower cover knob (230) is provided with a cylindrical groove (231), and the inner knob (600) is installed in the cylindrical groove (231).

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