Flow regulating valve capable of precisely regulating continuous flow and emergency flow of oxygen in stepless manner

Abstract

The invention discloses a flow regulating valve capable of precisely regulating continuous flow and emergency flow of oxygen in a stepless manner, which belongs to the technical field of production of gas flow regulating valves and comprises a valve body, a valve cover, a valve core, a valve rod, a valve rod seat, a continuous valve core push block, an emergency valve core push block, a continuous valve core pressure spring and an emergency valve core pressure spring. The continuous oxygen supply valve element and the emergency oxygen supply valve element are arranged in a continuous oxygen supply inner cavity and an emergency oxygen supply inner cavity in the valve body respectively, the continuous oxygen supply valve element is connected with a continuous valve element push block, the emergency oxygen supply valve element is connected with an emergency valve element push block, and the continuous valve element push block and the emergency valve element push block both make contact with the valve rod base. The valve rod seat is in threaded connection with the cavity wall of the inner cavity of the valve body, and the valve rod is connected with the valve rod seat. According to the invention, the function of synchronous precise stepless regulation of continuous flow and emergency flow of oxygen can be realized, the oxygen flow regulation function of a continuous oxygen supply mode and an emergency oxygen supply mode can be realized only by one flow regulation valve, the use is convenient, and the space is saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of gas flow control valve production, and specifically relates to an oxygen flow control valve, and in particular to a flow control valve capable of accurately and steplessly adjusting continuous oxygen flow and emergency flow. Background Art

[0002] In the aerospace onboard oxygen supply system, an oxygen flow regulator is generally connected between the oxygen concentrator and the breathing mask. A lung-type flow regulator is usually used as a commonly used oxygen flow regulator, which can automatically adjust the oxygen supply flow according to the breathing state of the oxygen-inhaling personnel. This is the normal oxygen inhalation mode.

[0003] In order to prevent the oxygen flow regulator from being unable to automatically adjust the oxygen flow due to power outages or failures, and to prevent the oxygen concentrator from being unable to supply oxygen due to power outages or failures, in actual applications, two oxygen supply modes with independent oxygen supply channels, namely continuous oxygen supply mode and emergency oxygen supply mode, will be added. The continuous oxygen supply mode is an oxygen supply mode that is directly connected between the oxygen concentrator and the breathing mask, and the emergency oxygen supply mode is an oxygen supply mode that is directly connected between the oxygen cylinder and the breathing mask, so as to ensure that oxygen-receiving personnel have oxygen to breathe under any circumstances.

[0004] At present, in both the continuous oxygen supply mode and the emergency oxygen supply mode, the oxygen supply flow rates are fixed, that is, the continuous flow rate in the continuous oxygen supply mode and the emergency flow rate in the emergency oxygen supply mode are fixed. Oxygen-receiving personnel cannot adjust the oxygen supply during the oxygen inhalation process. Due to individual differences in human lung capacity and breathing process, the fixed flow rate of oxygen-rich gas causes different breathing sensations in the human body, which may reduce breathing comfort in mild cases and may cause excessive blood oxygen concentration, respiratory system damage or hypoxia in severe cases. If a general regulating valve is used for adjustment, there are problems such as only being able to adjust the continuous flow rate or the emergency flow rate separately and the low adjustment accuracy, resulting in unchanged use. Summary of the invention

[0005] The object of the present invention is to provide a flow control valve which can accurately and steplessly adjust the continuous flow rate and emergency flow rate of oxygen in order to solve the above problems.

[0006] The present invention achieves the above-mentioned purpose through the following technical solutions: A flow regulating valve capable of accurately and steplessly regulating the continuous flow and emergency flow of oxygen comprises a valve body, a valve cover, a valve core and a valve stem, and further comprises a valve stem seat, a continuous valve core push block, an emergency valve core push block, a continuous valve core compression spring and an emergency valve core compression spring. The valve body is provided with a valve body cavity with an opening at one end, the valve cover is connected to the open end of the valve body and takes the open end as the rear end, the valve stem seat with an external thread on the circumferential outer wall is placed at the rear part of the valve body cavity and is connected to the internal thread on the circumferential cavity wall at the rear part of the valve body cavity, the front end of the valve stem passes through the corresponding through hole on the valve cover and is connected to the valve stem seat, and the middle part of the front end cavity wall of the valve body cavity extends backwards to form a partition The valve core comprises a continuous oxygen supply valve core and an emergency oxygen supply valve core. The front side cavity wall of the continuous oxygen supply cavity is provided with a continuous oxygen inlet. The front end cavity wall of the continuous oxygen supply cavity is provided with a continuous oxygen outlet hole. The continuous oxygen supply valve core is placed in the continuous oxygen supply cavity and is in sealing contact with the cavity wall of the continuous oxygen supply cavity and can slide back and forth. A continuous valve core control rod is provided in the middle of the front end of the continuous oxygen supply valve core. The front section of the continuous valve core control rod is located in the rear section of the continuous oxygen outlet hole. A continuous valve core control rod with a smaller outer diameter at the front and a larger outer diameter at the rear is provided on the continuous valve core control rod. A conical section of the continuous valve core, the front end of the continuous valve core push block located in the middle of the inner cavity of the valve body is connected to the continuous oxygen supply valve core, and the rear end is in contact with the front end plane of the valve stem seat, the rear end of the continuous valve core push block is provided with a boss with an increased outer diameter, the front end of the continuous valve core compression spring sleeved outside the continuous valve core push block is in contact with the corresponding cavity wall of the inner cavity of the valve body, and the rear end is in contact with the boss at the rear end of the continuous valve core push block, the front side cavity wall of the emergency oxygen supply inner cavity is provided with an emergency oxygen inlet, the front end cavity wall of the emergency oxygen supply inner cavity is provided with an emergency oxygen outlet through hole, the emergency oxygen supply valve core is placed in the emergency oxygen supply inner cavity and is sealed with the cavity wall of the emergency oxygen supply inner cavity. The emergency oxygen supply valve core is in contact with and can slide back and forth, an emergency valve core control rod is provided in the middle of the front end of the emergency oxygen supply valve core, the front section of the emergency valve core control rod is located in the rear section of the emergency oxygen outlet through hole, and the emergency valve core control rod is provided with an emergency valve core conical section with a smaller outer diameter at the front and a larger outer diameter at the rear. The front end of the emergency valve core push block located in the middle of the inner cavity of the valve body is connected to the emergency oxygen supply valve core, and the rear end is in contact with the front end plane of the valve stem seat, and the rear end of the emergency valve core push block is provided with a boss with an increased outer diameter, and the front end of the emergency valve core compression spring sleeved outside the emergency valve core push block is in contact with the corresponding cavity wall of the inner cavity of the valve body, and the rear end is in contact with the boss at the rear end of the emergency valve core push block.

[0007] Preferably, in order to facilitate more reliable positioning of the valve stem seat and increase the torque of the rotating valve stem to increase stability during oxygen flow control, the diameter of the middle and front sections of the through hole on the valve cover for the valve stem to pass through is enlarged to form a large-diameter hole in the valve cover, the front section of the valve stem seat is threadedly connected to the rear circumferential cavity wall of the inner cavity of the valve body, and the outer diameter of the middle and rear sections of the valve stem seat is reduced to form a cylindrical small-diameter section of the valve stem seat, the front end of the valve stem is connected to the rear end of the small-diameter section of the valve stem seat, and the small-diameter section of the valve stem seat is placed in the large-diameter hole of the valve cover and is in close contact with the circumferential hole wall of the large-diameter hole of the valve cover.

[0008] Preferably, in order to further increase the torque of the rotating valve stem to offset the torque change caused by the pressure change in the inner cavity of the valve body, thereby achieving a higher precision and more stable oxygen flow regulation function, the hole walls on the opposite sides of the large-diameter hole of the valve cover are respectively provided with radially through-going clamping holes, two clamping nuts are respectively placed in the two clamping holes near the outer ends and are threadedly connected to the corresponding hole walls of the clamping holes, two clamping plugs are respectively placed in the two clamping holes near the inner ends, two clamping springs are respectively placed in the middle of the two clamping holes, and the two ends of the clamping springs are respectively in contact with the corresponding clamping nuts and the clamping plugs.

[0009] Preferably, in order to increase the friction between the small diameter section of the valve stem seat and the wall of the large diameter hole of the valve cover and the tightening plug, thereby facilitating increasing the torque of the rotating screw and improving the stability during the control process, the circumferential outer wall of the small diameter section of the valve stem seat is provided with a plurality of anti-slip convex grooves which are convex outward and have a length direction in the front-to-back direction.

[0010] Preferably, in order to facilitate the rapid positioning and connection of the valve stem and the valve stem seat, the small diameter section of the valve stem seat is provided with a valve stem seat blind hole with a rear end opening, the front end of the valve stem is placed in the valve stem seat blind hole, the hole wall of the valve stem seat blind hole is provided with a radially through screw hole and a stud is placed in the screw hole and threadedly connected, a positioning groove is provided at a position on the valve stem corresponding to the stud and the inner end of the stud is placed in the positioning groove.

[0011] Preferably, in order to limit the rotation angle of the valve stem so as to avoid the problem of excessive or insufficient oxygen flow caused by a too large rotation range, a circular arc-shaped limit ring protruding backwards is provided in the middle part of the rear end of the valve cover, and a circular ring-shaped limit sleeve is mounted on the position of the valve stem corresponding to the circular arc-shaped limit ring. A blocking portion protruding toward the circumferential direction is provided on the outer wall of the limit sleeve, and the blocking portion can be blocked by the two open ends of the circular arc-shaped limit ring during the rotation of the valve stem.

[0012] Preferably, in order to better limit the rotation angle of the valve stem, the arc-shaped limiting ring is semicircular.

[0013] The beneficial effects of the present invention are: The present invention provides a continuous oxygen supply inner cavity and an emergency oxygen supply inner cavity in the valve body, and respectively places the continuous oxygen supply valve core and the emergency oxygen supply valve core in the continuous oxygen supply inner cavity and the emergency oxygen supply inner cavity, and the continuous oxygen supply valve core and the emergency oxygen supply valve core are in contact with the valve stem seat through the continuous valve core pushing block and the emergency valve core pushing block respectively, so that the valve stem seat can be driven to move forward and backward when the valve stem is rotated, thereby pushing the continuous oxygen supply valve core and the emergency oxygen supply valve core to move forward synchronously, and the continuous oxygen supply valve core and the emergency oxygen supply valve core to move backward synchronously under the action of the continuous valve core compression spring and the emergency valve core compression spring, thereby achieving the purpose of synchronously adjusting the continuous oxygen flow rate and the emergency oxygen flow rate, and through the existing The technology uses precision machining between the front section of the continuous valve core control rod and the rear section of the continuous oxygen outlet hole, and between the front section of the emergency valve core control rod and the rear section of the emergency oxygen outlet hole, so that the synchronous and precise stepless regulation function of the continuous oxygen flow and the emergency flow can be realized. Only one flow regulating valve is needed to realize the oxygen flow regulation function of the continuous oxygen supply mode and the emergency oxygen supply mode, which significantly improves the oxygen breathing comfort of oxygen-breathing personnel and is conducive to healthy oxygen breathing. It is easy to use and saves space compared to two independent regulating valves. It is especially suitable for use in connection with a breathing mask in the continuous oxygen supply mode and the emergency oxygen supply mode of aerospace equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a stereoscopic diagram of the flow control valve capable of accurately and steplessly adjusting the continuous flow and emergency flow of oxygen according to the present invention; Figure 2 It is a front sectional view of the flow control valve capable of accurately and steplessly adjusting the continuous flow rate and emergency flow rate of oxygen according to the present invention, in which the arc-shaped limiting ring is omitted; Figure 3 yes Figure 2 A magnified view of "A" in the figure; Figure 4 yes Figure 2 Enlarged view of "B" in the figure; Figure 5 yes Figure 2 Magnified view of the CC section in . DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings: like Figure 1-Figure 5As shown, the flow regulating valve capable of accurately and steplessly regulating the continuous flow and emergency flow of oxygen according to the present invention comprises a valve body 1, a valve cover 4, a valve core, a valve stem 8, a valve stem seat 20, a continuous valve core push block 15, an emergency valve core push block 23, a continuous valve core compression spring 14 and an emergency valve core compression spring 24. A valve body inner cavity 18 with an opening at one end is provided in the valve body 1, the valve cover 4 is connected to the open end of the valve body 1 and takes the open end as the rear end, a valve stem seat 20 with an external thread on the circumferential outer wall is disposed at the rear part of the valve body inner cavity 18 and is connected to the internal thread on the rear circumferential cavity wall of the valve body inner cavity 18, the front end of the valve stem 8 passes through the corresponding through hole on the valve cover 4 and is connected to the valve stem seat 20, and the middle part of the front end cavity wall of the valve body inner cavity 18 extends backward to form a partition portion 16 and the partition part 16 separates the front part of the valve body cavity 18 into a continuous oxygen supply cavity 11 and an emergency oxygen supply cavity 21, the valve core includes a continuous oxygen supply valve core 13 and an emergency oxygen supply valve core 19, the front side cavity wall of the continuous oxygen supply cavity 11 is provided with a continuous oxygen inlet 2, the front end cavity wall of the continuous oxygen supply cavity 11 is provided with a continuous oxygen outlet hole 9, the continuous oxygen supply valve core 13 is placed in the continuous oxygen supply cavity 11 and is in sealing contact with the cavity wall of the continuous oxygen supply cavity 11 and can slide forward and backward, a continuous valve core control rod 12 is provided in the middle of the front end of the continuous oxygen supply valve core 13, the front section of the continuous valve core control rod 12 is located in the rear section of the continuous oxygen outlet hole 9, and a continuous valve core control rod 12 is provided with a continuous valve core with a smaller outer diameter at the front and a larger outer diameter at the rear. The valve core conical section 26, the front end of the continuous valve core push block 15 located in the middle of the valve body inner cavity 18 is connected to the continuous oxygen supply valve core 13 by threaded connection, and the rear end is in contact with the front end plane of the valve stem seat 20, and the rear end of the continuous valve core push block 15 is provided with a boss with an increased outer diameter (not marked in the figure), the front end of the continuous valve core compression spring 14 sleeved on the outside of the continuous valve core push block 15 is in contact with the corresponding cavity wall of the valve body inner cavity 18, and the rear end is in contact with the boss at the rear end of the continuous valve core push block 15, the front side cavity wall of the emergency oxygen supply cavity 21 is provided with an emergency oxygen inlet 25, the front end cavity wall of the emergency oxygen supply cavity 21 is provided with an emergency oxygen outlet through hole 10, the emergency oxygen supply valve core 19 is placed in the emergency oxygen supply cavity 21 and is in contact with the cavity wall of the emergency oxygen supply cavity 21 Sealed contact and able to slide back and forth, an emergency valve core control rod 17 is provided in the middle of the front end of the emergency oxygen supply valve core 19, the front section of the emergency valve core control rod 17 is located in the rear section of the emergency oxygen outlet through hole 10, and the emergency valve core control rod 17 is provided with an emergency valve core conical section 27 with a smaller outer diameter at the front and a larger outer diameter at the rear. The front end of the emergency valve core push block 23 located in the middle of the valve body inner cavity 18 is connected to the emergency oxygen supply valve core 19, and the rear end is in contact with the front end plane of the valve stem seat 20, and the rear end of the emergency valve core push block 23 is provided with a boss with an increased outer diameter (not marked in the figure), and the front end of the emergency valve core compression spring 24 sleeved on the outside of the emergency valve core push block 23 is in contact with the corresponding cavity wall of the valve body inner cavity 18, and the rear end is in contact with the boss at the rear end of the emergency valve core push block 23.

[0016] like Figure 1-Figure 5 As shown, the present invention also discloses the following more optimized specific structures: In order to facilitate more reliable positioning of the valve stem seat 20 and increase the torque of the rotating valve stem 8 to increase the stability during the oxygen flow control process, the diameter of the middle and front sections of the through hole on the valve cover 4 for the valve stem 8 to pass through is increased to form a large diameter hole of the valve cover (not marked in the figure), the front section of the valve stem seat 20 is threadedly connected to the rear circumferential cavity wall of the inner cavity 18 of the valve body, and the outer diameter of the middle and rear sections of the valve stem seat 20 is reduced to form a cylindrical valve stem seat small diameter section (not marked in the figure), the front end of the valve stem 8 is connected to the rear end of the valve stem seat small diameter section, and the valve stem seat small diameter section is placed in the large diameter hole of the valve cover and is in close contact with the circumferential hole wall of the large diameter hole of the valve cover.

[0017] In order to further increase the torque of the rotating valve stem 8 to offset the torque change caused by the pressure change in the inner cavity 18 of the valve body, thereby achieving a more precise and stable oxygen flow regulation function, the hole walls on the opposite sides of the large-diameter hole of the valve cover are respectively provided with radially penetrating clamping holes (not marked in the figure), and the two clamping nuts 3 are respectively placed in the two clamping holes near the outer ends and are threadedly connected to the corresponding hole walls of the clamping holes, and the two clamping plugs 29 are respectively placed in the two clamping holes near the inner ends, and the two clamping springs 28 are respectively placed in the middle of the two clamping holes, and the two ends of the clamping springs 28 are respectively in contact with the corresponding clamping nuts 3 and the clamping plugs 29.

[0018] In order to increase the friction between the small diameter section of the valve stem seat and the wall of the large diameter hole of the valve cover and the tightening plug 29, thereby more conducive to increasing the torque of the rotating screw 8 and improving the stability during the control process, the circumferential outer wall of the small diameter section of the valve stem seat is provided with a plurality of anti-slip convex grooves which are convex outward and have a length direction in the front-to-back direction (not shown in the figure because they are relatively thin).

[0019] In order to facilitate the rapid positioning and connection of the valve stem 8 and the valve stem seat 20, the small-diameter section of the valve stem seat is provided with a valve stem seat blind hole (not marked in the figure) with a rear end opening, the front end of the valve stem 8 is placed in the valve stem seat blind hole, the hole wall of the valve stem seat blind hole is provided with a radially through screw hole, and the stud 22 is placed in the screw hole and threadedly connected, and a positioning groove (not marked in the figure) is provided at a position on the valve stem 8 corresponding to the stud 22, and the inner end of the stud 22 is placed in the positioning groove.

[0020] In order to limit the rotation angle of the valve stem 8 and avoid the problem of excessive or insufficient oxygen flow caused by a too large rotation range, a circular arc-shaped limit ring 7 protruding backwards is provided in the middle of the rear end of the valve cover 4, and a circular ring-shaped limit sleeve 6 is mounted on the valve stem 8 at a position corresponding to the circular arc-shaped limit ring 7. A blocking portion 5 protruding toward the outer circumferential direction is provided on the outer wall of the limit sleeve 6. The blocking portion 5 can be blocked by the two open ends of the circular arc-shaped limit ring 6 during the rotation of the valve stem 8.

[0021] In order to better limit the rotation angle of the valve stem 8, the arc-shaped limiting ring 7 is semicircular.

[0022] like Figure 3 and Figure 4 As shown, the oxygen flow rate in the continuous oxygen supply mode is significantly greater than the oxygen flow rate in the emergency oxygen supply mode, so the corresponding aperture of the continuous oxygen outlet hole 9 is significantly larger than the aperture of the emergency oxygen outlet hole 10, the taper of the continuous valve core conical section 26 is significantly larger than the taper of the emergency valve core conical section 27, and the gap between the continuous valve core control rod 12 and the hole wall of the continuous oxygen outlet hole 9 is significantly larger than the gap between the emergency valve core control rod 17 and the hole wall of the emergency oxygen outlet hole 10, so as to realize the precise control function of the continuous oxygen flow rate and the emergency flow rate, and the relevant dimensions between the components can be easily realized by the existing technology, so precise control is completely achievable.

[0023] like Figure 1-Figure 5 As shown, when in use, the continuous oxygen inlet 2 is connected to the outlet of the oxygen concentrator (not shown in the figure), the emergency oxygen inlet 25 is connected to the outlet of the oxygen cylinder (not shown in the figure), and the continuous oxygen outlet hole 9 and the emergency oxygen outlet hole 10 are respectively connected to the breathing mask (not shown in the figure). Before the oxygen inhaler starts to inhale oxygen through the continuous oxygen supply mode or the emergency oxygen supply mode, he first rotates the valve stem 8 according to his own lung capacity and breathing habits, driving the valve stem seat 20 to rotate synchronously. Since the valve stem seat 20 is threadedly connected to the circumferential cavity wall of the inner cavity 18 of the valve body and the valve body 1 will not rotate, the valve stem seat 20 will move forward or backward. If the valve stem seat 20 moves forward, the continuous oxygen supply valve core 13 and the emergency oxygen supply valve core 19 are pushed forward synchronously by the continuous valve core push block 15 and the emergency valve core push block 23, and the continuous valve core The gap between the control rod 12 and the hole wall of the continuous oxygen outlet hole 9, and the gap between the emergency valve core control rod 17 and the hole wall of the emergency oxygen outlet hole 10 will both be reduced, thereby achieving the purpose of reducing the continuous oxygen flow rate and the emergency flow rate; if the valve stem seat 20 moves backward, the continuous valve core compression spring 14 and the emergency valve core compression spring 24 will push the continuous valve core push block 15 and the emergency valve core push block 23 to move backward, thereby driving the continuous oxygen supply valve core 13 and the emergency oxygen supply valve core 19 to move backward synchronously, and the gap between the continuous valve core control rod 12 and the hole wall of the continuous oxygen outlet hole 9, and the gap between the emergency valve core control rod 17 and the hole wall of the emergency oxygen outlet hole 10 will both be increased, thereby achieving the purpose of increasing the continuous oxygen flow rate and the emergency flow rate, and finally achieving the purpose of synchronous regulation of the continuous oxygen flow rate and the emergency flow rate.

[0024] During the process of rotating the valve stem 8, there is sufficient friction between the small diameter section of the valve stem seat 20 and the large diameter hole wall of the valve cover 4 and the two clamping plugs 29. The torque is large and stable, which can offset the torque change caused by the pressure change in the inner cavity 18 of the valve body, thereby achieving a higher precision and more stable oxygen flow regulation function.

[0025] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A flow control valve capable of accurately and steplessly adjusting the continuous flow and emergency flow of oxygen, comprising a valve body, a valve cover, a valve core and a valve stem, characterized in that: The valve body is provided with a valve inner cavity with an opening at one end, the valve cover is connected to the open end of the valve body and takes the open end as the rear end, the valve stem seat with an external thread on the circumferential outer wall is placed at the rear part of the inner cavity of the valve body and is connected to the internal thread on the circumferential cavity wall at the rear part of the inner cavity of the valve body, the front end of the valve stem is connected to the valve stem seat after passing through the corresponding through hole on the valve cover, the middle part of the front end cavity wall of the inner cavity of the valve body extends backward to form a partition part, and the partition part separates the front part of the inner cavity of the valve body into a continuous oxygen supply cavity and an emergency oxygen supply cavity. The inner cavity, the valve core includes a continuous oxygen supply valve core and an emergency oxygen supply valve core, the front side cavity wall of the continuous oxygen supply inner cavity is provided with a continuous oxygen inlet, the front end cavity wall of the continuous oxygen supply inner cavity is provided with a continuous oxygen outlet through hole, the continuous oxygen supply valve core is placed in the continuous oxygen supply inner cavity and is in sealing contact with the cavity wall of the continuous oxygen supply inner cavity and can slide back and forth, a continuous valve core control rod is provided at the middle part of the front end of the continuous oxygen supply valve core, the front section of the continuous valve core control rod is located in the rear section of the continuous oxygen outlet through hole, a continuous valve core conical section with a smaller outer diameter at the front and a larger outer diameter at the rear is provided on the continuous valve core control rod, and the continuous valve core conical section located in the middle part of the inner cavity of the valve body is provided with a continuous valve core conical section with a smaller outer diameter at the front and a larger outer diameter at the rear. The front end of the continuous valve core push block is connected to the continuous oxygen supply valve core, and the rear end is in contact with the front end plane of the valve stem seat. The rear end of the continuous valve core push block is provided with a boss with an increased outer diameter. The front end of the continuous valve core compression spring sleeved outside the continuous valve core push block is in contact with the corresponding cavity wall of the inner cavity of the valve body, and the rear end is in contact with the boss at the rear end of the continuous valve core push block. The front side cavity wall of the emergency oxygen supply inner cavity is provided with an emergency oxygen inlet, and the front end cavity wall of the emergency oxygen supply inner cavity is provided with an emergency oxygen outlet hole. The emergency oxygen supply valve core is placed in the emergency oxygen supply inner cavity and is in sealing contact with the cavity wall of the emergency oxygen supply inner cavity and can slide back and forth. An emergency valve core control rod is provided in the middle of the front end of the emergency oxygen supply valve core, and the front section of the emergency valve core control rod is located in the rear section of the emergency oxygen outlet through hole. The emergency valve core control rod is provided with an emergency valve core conical section with a smaller outer diameter at the front and a larger outer diameter at the rear. The front end of the emergency valve core push block located in the middle of the valve body cavity is connected to the emergency oxygen supply valve core, and the rear end is in contact with the front end plane of the valve stem seat. The rear end of the emergency valve core push block is provided with a boss with an increased outer diameter. The front end of the emergency valve core compression spring sleeved outside the emergency valve core push block is in contact with the corresponding cavity wall of the valve body cavity, and the rear end is in contact with the boss at the rear end of the emergency valve core push block.

2. The flow control valve capable of accurately and steplessly adjusting the continuous flow and emergency flow of oxygen according to claim 1, characterized in that: The diameter of the middle front section of the through hole on the valve cover for the valve stem to pass through is enlarged to form a large diameter hole of the valve cover, the front section of the valve stem seat is threadedly connected to the rear circumferential cavity wall of the inner cavity of the valve body, and the outer diameter of the middle rear section of the valve stem seat is reduced to form a cylindrical small diameter section of the valve stem seat, the front end of the valve stem is connected to the rear end of the small diameter section of the valve stem seat, and the small diameter section of the valve stem seat is placed in the large diameter hole of the valve cover and is in close contact with the circumferential hole wall of the large diameter hole of the valve cover.

3. The flow control valve capable of accurately and steplessly adjusting the continuous flow and emergency flow of oxygen according to claim 2, characterized in that: The hole walls on opposite sides of the large-diameter hole of the valve cover are respectively provided with radially penetrating clamping holes, two clamping nuts are respectively placed in the two clamping holes near the outer ends and are threadedly connected to the corresponding hole walls of the clamping holes, two clamping plugs are respectively placed in the two clamping holes near the inner ends, two clamping springs are respectively placed in the middle of the two clamping holes, and both ends of the clamping springs are respectively in contact with the corresponding clamping nuts and the clamping plugs.

4. The flow control valve capable of accurately and steplessly adjusting the continuous flow and emergency flow of oxygen according to claim 3, characterized in that: The circumferential outer wall of the small diameter section of the valve stem seat is provided with a plurality of anti-skid convex patterns which are protruding outwards and whose length direction is the front-to-back direction.

5. The flow control valve capable of accurately and steplessly adjusting the continuous flow rate and emergency flow rate of oxygen according to any one of claims 2 to 4, characterized in that: The small diameter section of the valve stem seat is provided with a valve stem seat blind hole with a rear end opening, the front end of the valve stem is placed in the valve stem seat blind hole, the hole wall of the valve stem seat blind hole is provided with a radially through screw hole, and a stud is placed in the screw hole and threadedly connected, and a positioning groove is provided at a position on the valve stem corresponding to the stud, and the inner end of the stud is placed in the positioning groove.

6. The flow control valve capable of accurately and steplessly adjusting the continuous flow rate and emergency flow rate of oxygen according to any one of claims 1 to 4, characterized in that: A circular arc-shaped limit ring protruding backwards is provided in the middle part of the rear end of the valve cover, and a circular ring-shaped limit sleeve is mounted on the valve stem at a position corresponding to the circular arc-shaped limit ring. A blocking portion protruding toward the circumferential direction is provided on the outer wall of the limit sleeve, and the blocking portion can be blocked by the two open ends of the circular arc-shaped limit ring during the rotation of the valve stem.

7. The flow control valve capable of accurately and steplessly adjusting the continuous flow and emergency flow of oxygen according to claim 6, characterized in that: The arc-shaped limiting ring is semicircular.

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