Oxygen supply valve with multi-stage pressure reduction function

Abstract

An oxygen supply valve with multi-stage pressure reduction function, comprising an oxygen supply valve body, a first pressure reduction chamber, a second pressure reduction chamber, a first pressure reduction channel and a second pressure reduction channel are arranged inside the oxygen supply valve body, a pressure plate is fixedly arranged above the first pressure reduction chamber, a first valve core group is arranged in the first pressure reduction chamber, a second valve core group is arranged in the second pressure reduction chamber, a cover plate is arranged at the top end of the oxygen supply valve body, an oxygen supply chamber is formed between the cover plate and the pressure plate, an air inlet channel is arranged at the lower end of the oxygen supply valve body and communicated with the first pressure reduction chamber, the first pressure reduction chamber and the second pressure reduction chamber are communicated through the first pressure reduction channel, the second pressure reduction chamber and the oxygen supply chamber are communicated through the second pressure reduction channel, an air outlet channel is arranged on the outer wall of the oxygen supply valve body and communicated with the oxygen supply chamber, a flow limiting piece for adjusting the air outlet pressure of the air outlet channel is arranged in the oxygen supply chamber, the oxygen output by the gas cylinder can be multi-stage pressure reduced, the oxygen supply is more stable, and the use effect of the user inhaling oxygen is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of valves, in particular to an oxygen supply valve with multi-stage pressure reduction function. BACKGROUND

[0002] The oxygen supply valve is installed on the gas cylinder for reducing the pressure of the oxygen in the gas cylinder. The oxygen supply valve on the market generally adopts a one-stage pressure reduction mode for oxygen supply pressure reduction. Such an oxygen supply valve has large pressure fluctuation and unstable oxygen supply pressure in actual use, mainly manifested in that when the pressure of the gas cylinder is large, the oxygen outlet pressure is also large, and when the pressure in the gas cylinder decreases with use, the oxygen outlet pressure of the oxygen supply valve also decreases, which is not good for use. In addition, the existing oxygen supply valve switch has large resistance when being opened or closed due to the fact that the pressure in the gas cylinder is much larger than the atmospheric pressure, and has certain use limitations. SUMMARY

[0003] The present application aims at overcoming the deficiencies of the prior art, and providing an oxygen supply valve with multi-stage pressure reduction function to solve the problems in the above technical background.

[0004] The purpose of the present application is achieved by the following technical scheme:

[0005] The oxygen supply valve with multi-stage pressure reduction function comprises an oxygen supply valve body, a first pressure reduction chamber, a second pressure reduction chamber, a first pressure reduction channel and a second pressure reduction channel are arranged in the oxygen supply valve body, a pressure plate is fixedly arranged above the first pressure reduction chamber, a first valve core group is arranged in the first pressure reduction chamber, a second valve core group is arranged in the second pressure reduction chamber, a cover plate is arranged at the top end of the oxygen supply valve body, an oxygen supply chamber is formed between the cover plate and the pressure plate, an air inlet channel is arranged at the lower end of the oxygen supply valve body and communicates with the first pressure reduction chamber, the first pressure reduction chamber and the second pressure reduction chamber are communicated through the first pressure reduction channel, the second pressure reduction chamber and the oxygen supply chamber are communicated through the second pressure reduction channel, an air outlet channel is arranged on the outer wall of the oxygen supply valve body and communicates with the oxygen supply chamber, and a flow limiting member for controlling the opening and closing of the oxygen supply valve is arranged in the oxygen supply chamber.

[0006] In the above summary, further, the first valve core group comprises a valve needle and a first spring, the valve needle comprises a ring-shaped portion and a needle portion arranged on the lower surface of the ring-shaped portion, a recessed portion is arranged on the upper surface of the ring-shaped portion, the recessed portion and the pressure plate form an air containing chamber, the needle portion is arranged opposite to the air inlet channel, a needle channel communicating with the air containing chamber is arranged in the needle portion, and the first spring is sleeved in the first pressure reduction chamber and abuts against the lower surface of the ring-shaped portion. The valve needle moves back and forth along the height direction of the first pressure reduction chamber under the action of the first spring, thereby controlling the opening and closing of the air inlet channel.

[0007] In the above summary of the invention, further, the secondary valve core group comprises an upper cover, a second spring, a secondary valve core rod, a secondary valve core and a secondary valve core seat, the upper cover is fixed on the outer wall of the oxygen supply valve body through an elastic diaphragm, an installation cavity is formed between the upper cover and the elastic diaphragm, a spring sleeve is arranged at the upper end of the installation cavity, the upper end of the second spring is sleeved in the spring sleeve, the lower end of the second spring abuts against the elastic diaphragm through a spring washer, the upper end of the secondary valve core rod passes through the elastic diaphragm and the spring washer vertically in sequence and is fixed on the spring washer through a locking nut, the secondary valve core seat is installed in the second pressure reduction chamber, the secondary valve core is installed at the lower end of the secondary valve core rod and forms a first air passing gap with the secondary valve core seat, the secondary valve core moves back and forth along the secondary valve core rod under the action of the second spring, and then the opening and closing of the first air passing gap are controlled.

[0008] In the above summary of the invention, further, the flow limiting piece comprises a flow limiting plate and a rotating shaft integrally formed on the flow limiting plate, air permeable holes are arranged on the surface of the flow limiting plate, flow limiting valve plates are arranged in the air permeable holes, the cover plate comprises a top plate and a boss integrally formed on the lower surface of the top plate, a through hole penetrating through the top plate and the boss is arranged at the center of the cover plate, an air passing hole is arranged on the lower surface of the boss, an air outlet hole communicating with the air passing hole is arranged on the side wall of the boss, the flow limiting piece is sleeved in the through hole and can rotate along the through hole, the air passing hole can communicate with the air permeable hole through the rotation of the flow limiting piece, a second air passing gap is formed between the flow limiting plate and the upper surface of the pressing plate, a third air passing gap is formed between the side wall of the boss and the inner wall of the oxygen supply chamber, and the air outlet channel communicates with the third air passing gap.

[0009] In the above summary of the invention, further, a plurality of air permeable holes are arranged on the surface of the flow limiting plate at equal intervals in the circumferential direction, flow limiting valve plates are arranged in the plurality of air permeable holes, the air passing amount of the flow limiting valve plate in each air permeable hole is different, and the air passing hole communicates with the plurality of air permeable holes one by one through the rotation of the flow limiting piece.

[0010] In the above summary of the invention, further, a pair of mounting holes are symmetrically arranged on the side wall of the boss, corrugated steel balls are arranged in the mounting holes, a plurality of grooves matched with the steel balls of the corrugated steel balls are arranged at equal intervals in the circumferential direction of the rotating shaft, and the rotating positioning between the cover plate and the flow limiting piece is realized through the grooves and the corrugated steel balls.

[0011] In the above summary of the invention, further, an identification plate is fixed on the upper surface of the top plate, a rotating handle fixed on the rotating shaft is arranged above the identification plate, an annular limiting groove is arranged on the lower surface of the rotating handle, a limiting protrusion is arranged on the upper surface of the top plate, and a compass is further nested on the upper surface of the rotating handle.

[0012] Further, the gas outlet channel is connected with a gas outlet nozzle fixed on the oxygen supply valve body, and the oxygen supply valve body is further provided with a gas filling channel communicated with the gas inlet channel, and the gas filling channel is connected with a gas filling nozzle fixed on the oxygen supply valve body.

[0013] Further, the oxygen supply valve body is further provided with a pressure measuring channel communicated with the gas inlet channel, and the pressure measuring channel is provided with a pressure gauge fixed on the oxygen supply valve body, and the pressure measuring channel is further connected with an explosion-proof valve fixed on the oxygen supply valve body.

[0014] Further, the pressure plate is provided with a perforation, and the perforation is oppositely arranged with the second pressure reducing channel, and the second pressure reducing channel is communicated with the oxygen supply chamber through the perforation.

[0015] The oxygen supply valve body is provided with a first pressure reducing chamber and a second pressure reducing chamber, and the first pressure reducing chamber and the second pressure reducing chamber are respectively provided with a first valve core group and a second valve core group, and the first valve core group and the second valve core group are used to control the gas outlet pressure through multi-stage pressure reduction, so that the pressure of the reduced oxygen will not fluctuate greatly with the gas pressure in the gas cylinder, and the purpose of stable oxygen supply can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective view of the present application;

[0017] Figure 2 It is a front view of the present application;

[0018] Figure 3 It is Figure 2 A-A sectional view of the present application;

[0019] Figure 4 It is a side view of the present application;

[0020] Figure 5 It is Figure 4 B-B sectional view of the present application;

[0021] Figure 6 It is a front view of the oxygen supply valve body of the present application;

[0022] Figure 7 It is Figure 6 C-C sectional view of the present application;

[0023] Figure 8 It is a side view of the oxygen supply valve body of the present application;

[0024] Figure 9 It isFigure 8 D-D sectional view of the present application;

[0025] Figure 10 E-E sectional view of the present application;

[0026] Figure 11 F-F sectional view of the present application; Figure 10

[0027] G-G sectional view of the present application; Figure 12

[0028] H-H sectional view of the present application; Figure 13 Figure 12 I-I sectional view of the present application;

[0029] Figure 14 J-J sectional view of the present application;

[0030] K-K sectional view of the present application; Figure 15

[0031] In the figure, 1 - oxygen supply valve body; 1.1 - first pressure reduction chamber; 1.2 - second pressure reduction chamber; 1.3 - first pressure reduction passage; 1.4 - second pressure reduction passage; 1.5 - oxygen supply chamber; 1.6 - air inlet passage; 1.7 - air outlet passage; 1.8 - inflation passage; 1.9 - pressure measurement passage; 2 - pressure plate; 2.1 - perforation, 3 - primary valve core group; 3.1 - valve needle; 3.11 - annular part; 3.12 - thimble part; 3.13 - recessed part; 3.14 - air containing chamber; 3.15 - valve needle passage; 3.2 - first spring; 4 - secondary valve core group, 4.1 - upper cover; 4.2 - second spring; 4.3 - secondary valve core rod; 4.4 - secondary valve core; 4.5 - secondary valve core seat; 4.6 - elastic diaphragm; 4.7 - mounting cavity; 4.8 - spring sleeve; 4.9 - spring gasket; 4.10 - locking nut; 4.11 - first air passage gap; 5 - cover plate; 5.1 - top plate; 5.2 - boss; 5.3 - through hole; 5.4 - air passage hole; 5.5 - air outlet hole; 5.6 - mounting hole; 5.7 - limiting protrusion; 6 - flow limiting member; 6.1 - flow limiting plate; 6.2 - rotating shaft; 6.3 - air permeable hole; 6.4 - flow limiting valve piece; 6.5 - groove, 7 - second air passage gap; 8 - third air passage gap; 9 - corrugated steel ball; 10 - identification plate; 11 - rotating handle; 11.1 - annular limiting groove 11.1; 12 - compass; 13 - air outlet nozzle, 14 - inflation nozzle; 15 - pressure gauge; 16 - explosion-proof valve; 17 - valve core pad; 18 - Teflon sealing pad. DETAILED DESCRIPTION

[0032] ​Following, the embodiments of the present application are illustrated by specific examples, and other advantages and effects of the present application can be easily understood by those skilled in the art from the disclosure of the present specification. The present application can also be implemented or applied by other different embodiments, and the details in the present specification can be modified or changed in various ways based on different views and applications without departing from the spirit of the present application. It should be noted that the following examples and features in the examples can be combined with each other without conflict.

[0033] It should be noted that the drawings provided in the following examples only illustrate the basic concept of the present application in a schematic manner, and only the components related to the present application are shown in the drawings, not the number, shape and size of the components when actually implemented. The actual implementation of each component can be a random change, and the component layout pattern can be more complex.

[0034] Example 1

[0035] An oxygen supply valve with multi-stage pressure reduction function, please refer to the attached Figure 1 -attached Figure 9 As shown, including the oxygen supply valve body 1, the first pressure reduction chamber 1.1, the second pressure reduction chamber 1.2, the first pressure reduction channel 1.3 and the second pressure reduction channel 1.4 are arranged inside the oxygen supply valve body 1, the pressure plate 2 is fixed above the first pressure reduction chamber 1.1, the first pressure reduction chamber 1.1 is provided with a first-stage valve core group 3, the second pressure reduction chamber 1.2 is provided with a second-stage valve core group 4, the top end of the oxygen supply valve body 1 is provided with a cover plate 5, the cover plate 5 and the pressure plate 2 form an oxygen supply chamber 1.5, the lower end of the oxygen supply valve body 1 is provided with an air inlet channel 1.6 which is in communication with the first pressure reduction chamber 1.1, the first pressure reduction chamber 1.1 and the second pressure reduction chamber 1.2 are in communication through the first pressure reduction channel 1.3, the second pressure reduction chamber 1.2 and the oxygen supply chamber 1.5 are in communication through the second pressure reduction channel 1.4, and the outer wall of the oxygen supply valve body 1 is provided with an air outlet channel 1.7 which is in communication with the oxygen supply chamber 1.5. In the specific use process of the present application, high-pressure oxygen enters the first pressure reduction chamber 1.1 through the air inlet channel 1.6, the first-stage valve core group 3 in the first pressure reduction chamber 1.1 performs the first pressure reduction on the high-pressure oxygen, the oxygen after the first pressure reduction enters the second pressure reduction chamber 1.2 through the first pressure reduction channel 1.3, the second-stage valve core group 4 in the second pressure reduction chamber 1.2 performs the second pressure reduction on the high-pressure oxygen, the oxygen after the second pressure reduction enters the oxygen supply chamber 1.5 through the second pressure reduction channel 1.4, and finally is discharged through the air outlet channel 1.7.

[0036] Please refer to the attached Figure 10 and attached Figure 11As shown, the primary valve core group 3 comprises a valve needle 3.1 and a first spring 3.2, the valve needle 3.1 comprises a ring part 3.11 and a thimble part 3.12 arranged on the lower surface of the ring part 3.11, the upper surface of the ring part 3.11 is provided with a recessed part 3.13, the recessed part 3.13 and the pressing plate 2 form a gas containing chamber 3.14, the thimble part 3.12 is arranged opposite to the gas inlet channel 1.6, the thimble part 3.12 is internally provided with a valve needle channel 3.15 which is in communication with the gas containing chamber 3.14, the first spring 3.2 is sleeved in the first pressure reducing chamber 1.1 and abuts against the lower surface of the ring part 3.11, the valve needle 3.1 moves back and forth along the height direction of the first pressure reducing chamber 1.1 under the action of the first spring 3.2, thereby controlling the opening and closing of the gas inlet channel 1.6, specifically, the high-pressure oxygen in the oxygen cylinder enters the first pressure reducing chamber 1.1 through the gas inlet channel 1.6, then the high-pressure oxygen enters the gas containing chamber 3.14 formed by the recessed part 3.13 and the pressing plate 2 through the valve needle channel 3.15, when the pressure in the gas containing chamber 3.14 is greater than the pressure of the first spring 3.2, the pressure in the gas containing chamber 3.14 overcomes the pressure of the first spring 3.2 and pushes the valve needle 3.1 downward, the valve needle 3.1 blocks the gas inlet channel 1.6 downward, preferably, the bottom end of the valve needle 3.1 is nested with a valve core pad 17, which enhances the blocking effect of the valve needle 3.1 on the gas inlet channel 1.6, when the oxygen in the first pressure reducing chamber 1.1 is discharged through the first pressure reducing channel 1.3, the pressure in the first pressure reducing channel 1.3 decreases, the first spring 3.2 pushes the valve needle 3.1 upward again, the high-pressure oxygen in the oxygen cylinder flows into the first pressure reducing chamber 1.1 through the gas inlet channel 1.6 again, thereby achieving the effect of primary pressure reduction, the pressure of the oxygen after primary pressure reduction can be stabilized within a certain range, which is convenient for secondary pressure reduction.

[0037] Please refer to the accompanying drawings Figure 12 and the accompanying drawings Figure 13As shown, the second valve core group 4 includes an upper cover 4.1, a second spring 4.2, a second valve core rod 4.3, a second valve core 4.4, and a second valve core seat 4.5, the upper cover 4.1 is fixed on the outer wall of the oxygen supply valve body 1 by an elastic diaphragm 4.6, there is a mounting cavity 4.7 between the upper cover 4.1 and the elastic diaphragm 4.6, the upper end of the mounting cavity 4.7 is provided with a spring sleeve 4.8, the upper end of the second spring 4.2 is sleeved in the spring sleeve 4.8, the lower end of the second spring 4.2 abuts against the elastic diaphragm 4.6 through a spring washer 4.9, the upper end of the second valve core rod 4.3 passes through the elastic diaphragm 4.6 and the spring washer 4.9 in sequence and is fixed on the spring washer 4.9 by a locking nut 4.10, the second valve core seat 4.5 is installed in the second pressure reduction chamber 1.2, the second valve core 4.4 is installed at the lower end of the second valve core rod 4.3 and forms a first air passage gap 4.11 with the second valve core seat 4.5, the second valve core 4.4 moves back and forth along the second valve core rod 4.3 under the action of the second spring 4.2, thereby controlling the opening and closing of the first air passage gap 4.11, specifically, in the normal state, the second spring 4.2 is in a compressed state, the second spring 4.2 presses the elastic diaphragm 4.6 downward, the second valve core 4.4 moves downward under the push of the second valve core rod 4.3, at this time, the second valve core 4.4 does not contact the second valve core seat 4.5, the oxygen gas after the first pressure reduction enters the first air passage gap 4.11 through the first pressure reduction channel 1.3, since the second valve core 4.4 does not contact the second valve core seat 4.5, the oxygen gas can enter the cavity between the elastic diaphragm 4.6 and the second valve core seat 4.5 through the gap between the second valve core 4.4 and the second valve core seat 4.5, with the continuous entry of the oxygen gas, the pressure in the cavity between the elastic diaphragm 4.6 and the second valve core seat 4.5 will gradually increase, in the process of increasing, the elastic diaphragm 4.6 will be pressed upward, thereby driving the second valve core rod 4.3 to move upward, in the process of moving upward, the second valve core rod 4.3 drives the second valve core 4.4 to move upward and abut against the second valve core seat 4.5 (as shown in the attached Figure 13 As a preferred embodiment, a fluorine sealing gasket 18 is sleeved on the second valve core 4.4, which strengthens the sealing and closing effect between the second valve core 4.4 and the second valve core seat 4.5, after the oxygen gas in the cavity between the elastic diaphragm 4.6 and the second valve core seat 4.5 is discharged through the second pressure reduction channel 1.4, the pressure in the cavity decreases, the second spring 4.2 pushes the second valve core rod 4.3 downward again, and the second valve core 4.4 is separated from the second valve core seat 4.5, then the oxygen gas can enter the cavity between the elastic diaphragm 4.6 and the second valve core seat 4.5 through the first air passage gap 4.11, thereby achieving the purpose of the second pressure reduction, finally, the oxygen gas after the second pressure reduction enters the oxygen supply cavity 1.5 through the second pressure reduction channel 1.4, and is finally discharged through the air outlet channel 1.7.

[0038] Further explanation of the above embodiments is needed. Since the oxygen pressure in the oxygen cylinder is relatively high when it is first used, the first-stage valve core group 3 can first depressurize the oxygen in the cylinder, and then the second-stage valve core group 4 can depressurize it a second time. As the cylinder continues to be used, when the oxygen pressure in the cylinder decreases to below the depressurization pressure of the first-stage valve core group, the oxygen pressure in the cylinder is insufficient to push the valve needle 3.1, and the oxygen in the cylinder can directly enter the first depressurization channel 1.3 for depressurization by the second-stage valve core group. The advantage of this design is that the oxygen pressure after depressurization will always be maintained in a stable range, overcoming the disadvantage of the traditional depressurization valve that the oxygen pressure discharged at the beginning is relatively high and gradually decreases with use.

[0039] Example 2

[0040] In this implementation, the oxygen supply chamber 1.5 is equipped with a flow restrictor 6 for controlling the opening and closing of the oxygen supply valve. Please refer to the attached document for further details. Figure 3 Appendix Figure 5 , see attached Figure 14 and appendix Figure 15 As shown, the flow restrictor 6 includes a flow restrictor plate 6.1 and a rotating shaft 6.2 integrally formed on the flow restrictor plate 6.1. The surface of the flow restrictor plate 6.1 is provided with vent holes 6.3, and each vent hole 6.3 is provided with a flow restrictor valve plate 6.4. The cover plate 5 includes a top plate 5.1 and a boss 5.2 integrally formed on the lower surface of the top plate 5.1. A through hole 5.3 penetrating the top plate 5.1 and the boss 5.2 is provided at the center of the cover plate 5. The lower surface of the boss 5.2 is provided with an air passage hole 5.4, and the side wall of the boss 5.2 is provided with an air outlet hole 5.5 communicating with the air passage hole 5.4. The flow restrictor 6 is sleeved in the through hole 5.3 via the rotating shaft 6.2 and can rotate along the through hole 5.3. The air passage hole 5.4 can communicate with the vent hole 6.3 through the rotation of the flow restrictor 6. A second air passage gap 7 exists between the flow restrictor plate 6.1 and the upper surface of the pressure plate 2. (Continue to refer to the appendix...) Figure 3 and attached Figure 5 As shown, there is a third air passage 8 between the side wall of the boss 5.2 and the inner wall of the oxygen supply chamber 1.5, and the air outlet channel 1.7 is connected to the third air passage 8.

[0041] In the embodiment, the pressing plate 2 is further provided with a through hole 2.1, which is arranged opposite to the second pressure reduction channel 1.4, and the second pressure reduction channel 1.4 is communicated with the oxygen supply chamber 1.5 through the through hole 2.1. After the oxygen with secondary pressure reduction enters the oxygen supply chamber 1.5 through the second pressure reduction channel 1.4, the oxygen enters the air hole 6.3 through the second air gap 7 between the flow limiting plate 6.1 and the pressing plate 2, and the flow limiting valve piece 6.4 of the air hole 6.3 further reduces the pressure of the oxygen entering the air hole 6.3. When the air hole 6.3 is aligned with the air hole 6.3 through the rotation of the flow limiting plate 6.1, the air hole 6.3 enters the air outlet hole 5.5 through the air hole 5.4, and the air outlet hole 5.5 discharges the oxygen into the third air gap 8 between the side wall of the convex block 5.2 and the inner wall of the oxygen supply chamber 1.5, and finally discharges the oxygen through the air outlet nozzle 13 on the air outlet channel 1.7.

[0042] In the embodiment, the flow limiting piece 6 is connected to the cover plate 5 by rotation, and the air hole 6.3 on the flow limiting plate 6.1 of the flow limiting piece 6 is aligned with the air hole 5.4, so that the oxygen can be discharged through the air outlet hole 5.5 to achieve the purpose of opening the oxygen supply valve. Correspondingly, when the air hole 6.3 on the flow limiting plate 6.1 of the flow limiting piece 6 is misaligned with the air hole 5.4 through the rotation of the flow limiting piece, the oxygen in the air hole 6.3 cannot be discharged through the air outlet hole 5.5, thereby achieving the purpose of closing the oxygen valve. Through the above scheme, the problem of large resistance in opening or closing the oxygen supply valve due to high oxygen pressure in the traditional oxygen supply valve is overcome.

[0043] Example 3

[0044] In the embodiment, please continue to refer to the accompanying Figure 14 and the accompanying Figure 15 , which is different from the embodiment 2. The surface of the flow limiting plate 6.1 is provided with a plurality of air holes 6.3 at equal intervals in the circumferential direction, and the plurality of air holes 6.3 are each provided with a flow limiting valve piece 6.4. The air flow amount of the flow limiting valve piece 6.4 in each air hole 6.3 is different. The air hole 5.4 is communicated with the plurality of air holes 6.3 one by one through the rotation of the flow limiting piece 6. Through the above scheme, when the flow limiting piece 6 is rotated, the air hole 5.4 on the lower surface of the convex block 5.2 can be aligned with the plurality of air holes 6.3 for air communication, and because the air flow amount of the flow limiting valve piece 6.4 in each air hole 6.3 is different, the purpose of controlling different air outlet amounts can be achieved when the flow limiting piece 6 is rotated, so that the flow limiting piece 6 has the function of gear adjustment.

[0045] In the above embodiment, as a more optimal scheme, a pair of mounting holes 5.6 are symmetrically arranged on the side wall of the convex block 5.2, and please continue to refer to the accompanying Figure 5As shown, the mounting hole 5.6 is provided with a corrugated steel ball 9, and the rotating shaft 6.2 is provided with a plurality of grooves 6.5 equidistantly arranged in the circumferential direction and matched with the steel ball of the corrugated steel ball 9, and the limiting member 6 is rotationally positioned between the grooves 6.5 and the corrugated steel ball 9 and the cover plate 5. More preferably, the rotating shaft 6.2 is provided with six grooves 6.5 equidistantly arranged in the circumferential direction, two grooves 6.5 symmetrically arranged with each other form a group, and the six grooves 6.5 include three groups, each group corresponds to one gear, and the purpose of positioning each air outlet gear is achieved.

[0046] In the above embodiment, as a more preferable scheme, the upper surface of the top plate 5.1 is fixed with an identification plate 10, the upper surface of the identification plate 10 is provided with a rotating handle 11 fixed on the rotating shaft 6.2, the lower surface of the rotating handle 11 is provided with an annular limiting groove 11.1, the upper surface of the top plate 5.1 is provided with a limiting protrusion 5.7, and the upper surface of the rotating handle 11 is further nested with a compass 12. In this embodiment, the identification plate is respectively provided with four identification positions of "health", "exercise", "emergency" and "off", wherein "health", "exercise" and "emergency" correspond to three gears respectively. In use, the limiting member 6 is rotated with the rotating handle 11 to be communicated with different air holes 6.3, so as to realize the effect of different gears and different air outlet of the oxygen supply valve. The current air outlet can be directly observed by the lack groove on the rotating handle 11. When the limiting member 6 is not communicated with the plurality of air holes 6.3, the oxygen valve is in the off state. The annular limiting groove 11.1 and the limiting protrusion 5.7 are matched with each other, so that the rotating handle 11 can only be switched between the four identification positions, so that the user can quickly rotate the oxygen supply valve to the desired air supply gear.

[0047] Example 4

[0048] In the embodiment, the outlet channel 1.7 is connected with an outlet nozzle 13 fixed on the oxygen supply valve body 1, which facilitates the connection of the oxygen inhalation tube with the oxygen supply valve. In addition, the oxygen supply valve body 1 is provided with a charging channel 1.8 in communication with the inlet channel 1.6, and the charging channel 1.8 is connected with a charging nozzle 14 fixed on the oxygen supply valve body 1. In order to prevent the damage of the valve element in the oxygen supply valve caused by the external high-pressure oxygen, the conventional oxygen supply valve generally does not have the charging function. When the gas cylinder is charged, the conventional oxygen supply valve is first removed from the gas cylinder, and then a special charging accessory is connected to the gas cylinder for charging. In the application, the charging channel 1.8 and the inlet channel 1.6 are in communication with each other. When charging, the high-pressure oxygen enters the charging channel 1.8 and the inlet channel 1.6 in sequence through the charging nozzle 14. When the high-pressure oxygen enters the first pressure reduction chamber 1.1 upward through the inlet channel 1.6, the valve needle 3.1 moves downward under the pressure and closes the inlet channel 1.6, so that the high-pressure oxygen cannot enter the second pressure reduction chamber 1.2 through the first pressure reduction chamber 1.1 to damage the secondary valve core group 4. The high-pressure oxygen can only be charged into the gas cylinder downward through the inlet channel 1.6. Therefore, the application has stronger practicability compared with the conventional oxygen supply valve.

[0049] In the above embodiment, as a more optimal solution, the oxygen supply valve body 1 is further provided with a pressure measuring channel 1.9 in communication with the inlet channel 1.6. The pressure measuring channel 1.9 is provided with a pressure gauge 15 fixed on the oxygen supply valve body 1. The pressure in the gas cylinder can be directly observed through the pressure gauge. The pressure measuring channel 1.9 is further connected with an explosion-proof valve 16 fixed on the oxygen supply valve body 1. When the valve core group in the oxygen supply valve fails and the internal pressure of the oxygen supply valve is abnormal, the explosion-proof valve 16 can be used for pressure relief and explosion prevention.

[0050] The above embodiments only express the specific implementation of the application, which is described in detail and specifically, but cannot be understood as the limitation of the patent scope of the application. It should be noted that, for those skilled in the art, without departing from the concept of the application, a number of modifications and improvements can be made, which are all within the protection scope of the application.

Claims

1. An oxygen supply valve having a multi-stage pressure reducing function, characterized by, The oxygen supply valve body is internally provided with a first pressure reduction chamber, a second pressure reduction chamber, a first pressure reduction channel and a second pressure reduction channel, a pressure plate is fixed above the first pressure reduction chamber, a first valve core group is arranged in the first pressure reduction chamber, a second valve core group is arranged in the second pressure reduction chamber, a cover plate is arranged at the top end of the oxygen supply valve body, an oxygen supply chamber is formed between the cover plate and the pressure plate, an air inlet channel is arranged at the lower end of the oxygen supply valve body and communicated with the first pressure reduction chamber, the first pressure reduction chamber and the second pressure reduction chamber are communicated through the first pressure reduction channel, the second pressure reduction chamber and the oxygen supply chamber are communicated through the second pressure reduction channel, an air outlet channel is arranged on the outer wall of the oxygen supply valve body and communicated with the oxygen supply chamber, a flow limiting piece for controlling the opening and closing of the oxygen supply valve is arranged in the oxygen supply chamber. The first valve core group comprises a valve needle and a first spring, the valve needle comprises a ring-shaped part and a top needle part arranged on the lower surface of the ring-shaped part, a recessed part is arranged on the upper surface of the ring-shaped part, the recessed part and the pressure plate form an air containing chamber, the top needle part is arranged opposite to the air inlet channel, the inside of the top needle part is provided with a valve needle channel communicated with the air containing chamber, the first spring is sleeved in the first pressure reduction chamber and abuts against the lower surface of the ring-shaped part, the valve needle moves back and forth along the height direction of the first pressure reduction chamber under the action of the first spring, thereby controlling the opening and closing of the air inlet channel. The second valve core group comprises an upper cover, a second spring, a second valve core rod, a second valve core and a second valve core seat, the upper cover is fixed on the outer wall of the oxygen supply valve body through an elastic diaphragm, the upper cover and the elastic diaphragm have a mounting cavity, a spring sleeve is arranged at the upper end of the mounting cavity, the upper end of the second spring is sleeved in the spring sleeve, the lower end of the second spring abuts against the elastic diaphragm through a spring washer, the upper end of the second valve core rod is vertically arranged through the elastic diaphragm and the spring washer in sequence and is fixed on the spring washer through a locking nut, the second valve core seat is arranged in the second pressure reduction chamber, the second valve core is arranged at the lower end of the second valve core rod and forms a first air passing gap with the second valve core seat, the second valve core moves back and forth along the second valve core rod under the action of the second spring, thereby controlling the opening and closing of the first air passing gap. The flow limiting piece comprises a flow limiting plate and a rotating shaft integrally formed on the flow limiting plate, the surface of the flow limiting plate is provided with air permeable holes, the air permeable holes are each provided with a flow limiting valve piece, the cover plate comprises a top plate and a boss integrally formed on the lower surface of the top plate, the center of the cover plate is provided with a through hole penetrating through the top plate and the boss, the lower surface of the boss is provided with an air passing hole, the sidewall of the boss is provided with an air outlet hole communicated with the air passing hole, the flow limiting piece is sleeved in the through hole and can rotate along the through hole, the air passing hole can be communicated with the air permeable holes through the rotation of the flow limiting piece, the flow limiting plate and the upper surface of the pressure plate have a second air passing gap, the sidewall of the boss and the inner wall of the oxygen supply chamber have a third air passing gap, the air outlet channel is communicated with the third air passing gap.

2. The oxygen supply valve having a multi-stage pressure reducing function according to claim 1, characterized by, The surface of the flow limiting plate is provided with a plurality of air permeable holes at equal intervals in the circumferential direction, the plurality of air permeable holes are each provided with a flow limiting valve piece, the air passing amount of the flow limiting valve piece in each air permeable hole is different, the air passing hole is communicated with the plurality of air permeable holes one by one through the rotation of the flow limiting piece.

3. The oxygen supply valve having a multi-stage pressure reducing function according to claim 1, characterized by, The side wall of the boss is symmetrically provided with a pair of mounting holes, the mounting holes are provided with corrugated steel balls, a plurality of grooves matched with the steel balls of the corrugated steel balls are equidistantly arranged in the circumferential direction of the rotating shaft, and the limiting member is rotationally positioned between the grooves and the corrugated steel balls and the cover plate.

4. The oxygen supply valve having a multi-stage pressure reducing function according to claim 1, characterized by, The upper surface of the top plate is fixed with an identification plate, a rotating handle fixed on the rotating shaft is arranged above the identification plate, the lower surface of the rotating handle is provided with an annular limiting groove, the upper surface of the top plate is provided with a limiting protrusion, and the upper surface of the rotating handle is further nested with a compass.

5. The oxygen supply valve having a multi-stage pressure reducing function according to claim 1, characterized in that, The air outlet channel is connected with an air outlet fixed on the oxygen supply valve body, the oxygen supply valve body is further provided with a gas filling channel communicated with the air inlet channel, and the gas filling channel is connected with a gas filling nozzle fixed on the oxygen supply valve body.

6. The oxygen supply valve having a multi-stage pressure reducing function according to claim 1, characterized in that The oxygen supply valve body is further provided with a pressure measuring channel communicated with the air inlet channel, the pressure measuring channel is provided with a pressure gauge fixed on the oxygen supply valve body, and the pressure measuring channel is further connected with an explosion-proof valve fixed on the oxygen supply valve body.

7. The oxygen supply valve having a multi-stage pressure reducing function according to any one of claims 2 to 6, characterized in that, The pressing plate is provided with a perforation, the perforation is oppositely arranged with the second pressure reduction channel, and the second pressure reduction channel is communicated with the oxygen supply cavity through the perforation.

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