Portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve

Abstract

The invention provides a portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve, and belongs to the technical field of valves. A first-stage pressure reducing cavity and a second-stage pressure reducing cavity are formed in the valve body, a first-stage pressure reducing valve assembly is arranged in the first-stage pressure reducing cavity, and a second-stage pressure reducing valve assembly is arranged in the second-stage pressure reducing cavity. The first-stage pressure reducing valve assembly and the second-stage pressure reducing valve assembly conduct negative feedback according to set pressure reducing target pressure to automatically control pressure output and form two-stage negative feedback pressure reducing output. The lower end of the valve body is provided with an air inlet channel, the upper end of the valve body is provided with an oxygen supply cavity, the air inlet channel is communicated with an input port of the first-stage pressure reduction cavity, an output port of the first-stage pressure reduction cavity is communicated with an input port of the second-stage pressure reduction cavity through a first-stage pressure reduction rear air channel, and an output port of the second-stage pressure reduction cavity is communicated with the oxygen supply cavity through a second-stage pressure reduction rear air channel. Pressure output is controlled through two-stage control pressure negative feedback, and oxygen supply output with stable pressure required by corresponding states is provided under the conditions of medical treatment, heart, lung and brain hypoxia rescue of old people, exercise, mountaineering and plateau hypoxia.

Description

Technical Field

[0001] The invention belongs to the technical field of valves, and in particular relates to a portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve. Background Art

[0002] In actual production and life, various types of pressure reducing valves are widely used in the fields of medical treatment, welding, chemical industry, and urban water supply; in plateau hypoxia environments, mountaineering, sports, and elderly heart, lung, and brain hypoxia rescue, various types of portable oxygen supply equipment with pressure reducing valve devices are also in great demand. There are many types of working principles and structures, but few can achieve automatic sensing of pressure output changes, negative feedback automatic control, visualization, and provide the required and stable pressure oxygen supply output for the corresponding state.

[0003] The existing mature pressure reducing valves with negative feedback control are generally pressure reducing control valves with pilot or direct-operated valves, such as pilot negative feedback pressure reducing valves and direct-operated negative feedback pressure reducing valves. This type of pressure reducing valve feeds back the pressure after pressure reduction to the pilot valve or direct-operated valve, and the pilot valve controls the opening and closing degree of the gate valve by comparing it with the set pressure to control the size of the output pressure after pressure reduction. This type of pressure reducing valve is generally used in liquid, large-flow, and large-diameter pipe networks in chemical and urban water supply systems.

[0004] For high-pressure gases such as oxygen, nitrogen, and acetylene in the medical and welding industries, the pressure reducing valve generally adopts a one-stage or two-stage pressure reducing valve. The high-pressure gas is reduced by diffusing in the diffusion chamber after throttling to reduce the pressure. There is no negative feedback of the low pressure after the pressure reduction to control the opening and closing degree of the pressure reducing valve gate. The pressure after the pressure reduction will decrease with the decrease of the pressure of the high-pressure end cylinder, and the pressure needs to be manually adjusted. Most portable pressure reducers are derivative structures of this structure.

[0005] In medical treatment, plateau hypoxia environment, mountaineering, sports, elderly heart, lung, brain hypoxia rescue, there are also a large number of various types of portable oxygen supply equipment with pressure reducing valve devices. The pressure reducing principle is similar to that of high-pressure gas pressure reducing valves for medical, welding, oxygen, nitrogen, acetylene, etc. Generally, one-stage or two-stage pressure reducing valves are used. There is no low-pressure negative feedback after pressure reduction to control the opening and closing degree of the pressure reducing valve gate. The output pressure after pressure reduction is unstable, and some require manual adjustment to control the output pressure.

[0006] Among them, publication number CN114949529A discloses an oxygen supply valve with a multi-stage decompression function. Although the oxygen supply valve can achieve multi-stage decompression of the oxygen output from the gas cylinder, making the oxygen supply more stable and improving the oxygen inhalation effect of the user, the oxygen supply valve has the following defects:

[0007] This is a portable pressure reducing valve. The back pressure of the first-stage pressure reducing valve that controls the opening and closing of the valve core is to throttle the cylinder pressure through the side of the valve core, and then transfer the reduced pressure to the back of the first-stage valve core, forming a back pressure. Compared with the combined force of the set spring force and the small diameter high pressure of the valve core, the gate valve is opened and closed. When the back pressure and force are less than the set elastic force of the spring, the gate tends to open, and when the back pressure and force are greater than the set elastic force of the spring, the gate tends to close. The small diameter pressure of the valve core is the same as the cylinder pressure and decreases with the decrease of the cylinder pressure. Therefore, the pressure of the first-stage pressure reduction is the same as that of the first-stage pressure reduction. There is no feedback relationship between the opening and closing of the pressure reducing gate, and as the cylinder pressure decreases, the output pressure of the first-stage pressure reducing valve also decreases. The pressure of the first-stage pressure reducing valve is unstable during use and is a gradually decreasing process. At the same time, since the valve controlling the entry into the first-stage pressure reducing valve is a gate valve, the opening and closing degrees are relatively large, and the relatively high-pressure gas has good fluidity and is difficult to seal, the throttling pressure reducing effect is relatively poor. With the opening and closing of the gate valve, a high-pressure gas with a high gradient and large pulsation enters the first-stage pressure reducing chamber, which further aggravates the instability of the output pressure of the first-stage pressure reducing valve, with a large gradient and pulsating pressure output.

[0008] Its secondary pressure reduction process is similar to that of the primary pressure reducing valve. Its secondary spring sets the secondary pressure reduction force, which needs to overcome the combined force of the secondary output pressure and the primary output pressure acting on the outer end face of the secondary gate; only then can the secondary gate be opened, and the accumulated pressure after the primary pressure reduction is instantly released to the secondary pressure reduction space through the opened secondary gate, rather than throttling pressure reduction through a narrow gap. During the opening and closing process of the valve, the output pressure after pressure reduction forms a stepped, pulsed impact pressure and output, and the secondary pressure output is unstable.

[0009] Since high-pressure gas has good fluidity and is difficult to seal, if the first-level pressure reducing gate valve is not sealed well and leaks occur, the high pressure of the gas cylinder will directly reach the outer end face of the second-level gate valve, and the second-level pressure reducing spring will not be able to overcome the pressure of the sum of the pressure in the second-level pressure reducing chamber and the pressure of the second-level gate valve. The second-level gate valve will not be able to open, and the reduced-pressure gas cannot enter the second-level pressure reducing chamber, resulting in pressure in the high-pressure gas cylinder. The second-level pressure reducing valve cannot effectively reduce the pressure, and the pressure reducing valve will not release gas at the outlet, resulting in failure of the pressure reducing valve.

[0010] Based on the above-mentioned problems of various high-pressure gas pressure reducing valves, it is urgent to design a portable two-stage negative feedback and pressure automatic control oxygen supply pressure reducing valve. Summary of the invention

[0011] The technical problem solved by the present invention is to provide a portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve. The purpose of the present invention is to utilize the automatic control principle to automatically control the pressure output through two-stage control pressure negative feedback, so as to achieve a pressure reducing valve and equipment for oxygen supply output with a stable pressure required for medical treatment, elderly heart, lung, and brain hypoxia rescue, exercise, mountaineering, and plateau hypoxia.

[0012] In order to achieve the above object, the technical solution adopted by the present invention is:

[0013] A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve, comprising a valve body, wherein a primary pressure reducing chamber and a secondary pressure reducing chamber are arranged inside the valve body, a primary pressure reducing valve assembly is arranged inside the primary pressure reducing chamber, and a secondary pressure reducing valve assembly is arranged inside the secondary pressure reducing chamber, wherein both the primary pressure reducing valve assembly and the secondary pressure reducing valve assembly automatically control the pressure output by performing negative feedback according to a set pressure reducing target pressure and form a two-stage negative feedback pressure reducing output, wherein the throttle hole is arranged in the radial direction of the valve core to avoid interference of the controlled high-pressure end gas pressure on the pressure negative feedback pressure automatic control of the valve core end face;

[0014] An air inlet passage is provided at the lower end of the valve body, and an oxygen supply chamber is provided at the upper end of the valve body. The air inlet passage is communicated with the input port of the first-level decompression chamber, the output port of the first-level decompression chamber is communicated with the input port of the second-level decompression chamber through the air channel after the first-level decompression, and the output port of the second-level decompression chamber is communicated with the oxygen supply chamber through the air channel after the second-level decompression.

[0015] To further define the above scheme, the first-level pressure reducing valve assembly includes a first-level valve sleeve, a first-level valve core and a first-level spring, the first-level valve sleeve is fixed in the first-level pressure reducing chamber, the outer wall of the first-level valve sleeve is in sealing contact with the inner wall of the first-level pressure reducing chamber, the first-level valve sleeve throttle hole is formed on the first-level valve sleeve, and the first-level valve sleeve throttle hole is directly connected with the outlet of the air inlet channel; the first-level valve core is sleeved inside the first-level valve sleeve, the outer surface of the first-level valve core is in dynamic sealing contact with the inner surface of the first-level valve sleeve, the first-level spring is sleeved between the first-level valve sleeve and the first-level valve core, and the The lower end of the first-stage spring is pressed against the step surface of the inner wall of the first-stage valve sleeve, and the upper end of the first-stage spring is pressed against the step surface of the outer wall of the first-stage valve core; a first-stage valve core center hole is provided through the center of the first-stage valve core, and a first-stage valve core throttling hole is provided on the side wall of the first-stage valve core. The first-stage valve core throttling hole can adjust the opening and closing degree of the first-stage valve sleeve throttling hole as the first-stage valve core moves up and down; a first-stage valve core lower air pressure cavity is formed between the lower end surface of the first-stage valve core and the bottom surface of the first-stage decompression chamber, and a first-stage valve core upper air pressure cavity is formed between the upper end surface of the first-stage valve core and the top surface of the first-stage decompression chamber.

[0016] To further define the above scheme, the secondary pressure reducing valve assembly includes a secondary valve sleeve, a secondary valve core, a secondary spring and a pressure cover, the secondary valve sleeve is fixed in the secondary pressure reducing chamber, the outer wall of the secondary valve sleeve is in sealing contact with the inner wall of the secondary pressure reducing chamber, the secondary valve sleeve is formed with a secondary valve sleeve throttle hole, and the secondary valve sleeve throttle hole is directly connected with the airway outlet after the primary pressure reduction; the secondary valve core is sleeved inside the secondary valve sleeve, the outer surface of the secondary valve core is in dynamic sealing contact with the inner surface of the secondary valve sleeve, the secondary valve core center hole is provided in the center of the secondary valve core, the secondary valve core throttle hole is provided on the side wall of the secondary valve core, and the The throttle hole of the secondary valve core moves left and right along the axis of the secondary valve core to adjust the opening and closing degree of the throttle hole of the secondary valve sleeve; the pressure cover is fixed on the port of the secondary decompression chamber, and the secondary spring is arranged inside the pressure cover, one end of the secondary spring is pressed on the spring seat in the pressure cover, and the other end of the secondary spring is connected to the secondary valve core through the spring seat; a left air pressure chamber of the secondary valve core is formed between the left end surface of the secondary valve core and the bottom surface of the left end of the secondary decompression chamber, and a right air pressure chamber of the secondary valve core is formed between the middle step surface of the outer wall of the secondary valve core and the middle step surface of the inner wall of the secondary valve sleeve, and the right air pressure chamber is connected with the center hole of the secondary valve core through the side air hole.

[0017] As a further limitation of the above scheme, the primary spring and the secondary spring are selected according to a set decompression target pressure.

[0018] To further limit the above scheme, a cover plate is provided at the bottom of the oxygen supply chamber, a fixed seat II is provided in the oxygen supply chamber, an air gap is formed between the lower surface of the fixed seat II and the cover plate, and the output port of the secondary decompression chamber is connected with the air gap through the secondary decompression rear airway; an air outlet channel is provided on the side wall of the valve body, an air outlet valve plate is fixed on the fixed seat II by a pressure cap, the air outlet valve plate is connected with the air outlet channel through the airway provided on the fixed seat II, and an air outlet nozzle is provided on the air outlet channel.

[0019] To further limit the above scheme, a bead is provided on the upper part of the fixing seat II, the upper opening of the oxygen supply chamber is covered by the fixing seat I, an indicator plate is provided on the upper part of the fixing seat I, a mode selection handle is provided on the upper part of the indicator plate, and a status indicator is provided on the mode selection handle.

[0020] To further limit the above scheme, a stop valve is provided on the air intake passage, and the stop valve adopts a needle valve core or a ball valve core. An adjusting knob for adjusting the stop valve is provided on one side of the lower part of the valve body to open or close the supply of the high-pressure gas cylinder to the pressure reducing valve.

[0021] As a further limitation of the above scheme, a pressure gauge is provided on one side of the valve body, and the pressure gauge is connected to the air inlet channel through an air passage.

[0022] As a further limitation of the above scheme, a pressure relief hole is provided on the side wall of the valve body, the pressure relief hole is communicated with the air intake passage, a safety valve is provided on the pressure relief hole; and a filter is provided on the air intake passage.

[0023] The advantages of the present invention compared with the prior art are:

[0024] 1. The oxygen supply pressure reducing valve of this scheme is to automatically control the output through two-stage pressure reduction negative feedback pressure, set the pressure reduction target pressure for negative feedback, and automatically control the pressure output, feedback the high and low changes of the gas pressure after pressure reduction, control the size of the opening of the first and second stage exhaust throttle ports, and achieve a stable target output pressure, thus realizing a lightweight, portable, and highly integrated pressure reducing valve, and providing a pressure-stabilized oxygen supply output system. Under the oxygen supply state of the high-pressure gas cylinder, it automatically senses the pressure change of the gas cylinder, realizes visualization, and provides the oxygen supply output with the stable pressure required for the corresponding state after pressure reduction;

[0025] 2. This portable automatic control pressure-stabilizing oxygen supply pressure reducing valve is used for medical treatment, elderly heart, lung, brain hypoxia, plateau hypoxia, mountaineering, sports oxygen supply, life support, and rescue systems. It uses the negative feedback pressure reduction automatic control principle and automatically controls the pressure output through two-level control pressure negative feedback to achieve the stable pressure oxygen supply output required for the corresponding state when the pressure reaches normal, sports, mountaineering, and plateau hypoxia. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the two-stage negative feedback pressure-controlled oxygen supply pressure reducing valve (needle valve) of the present invention;

[0027] Figure 2 For the present invention Figure 1 The structural schematic diagram shown in the AA direction;

[0028] Figure 3 It is a schematic diagram of the structure of the pressure relief hole and the safety valve in the present invention;

[0029] Figure 4 It is a structural schematic diagram of a two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve (ball valve) of the present invention;

[0030] Figure 5 For the present invention Figure 4 A schematic diagram of the structure shown in the A′-A′ direction;

[0031] Figure 6 It is a schematic diagram of the decompression negative feedback automatic control decompression principle of the oxygen supply decompression valve in the present invention;

[0032] Figure 7 This is a schematic diagram of the first-level negative feedback pressure reduction control in the oxygen supply pressure reducing valve of the present invention;

[0033] Figure 8It is a schematic diagram of the secondary negative feedback pressure reduction control in the oxygen supply pressure reducing valve of the present invention;

[0034] Fig. 9 It is a schematic diagram of the oxygen absorption and exhaust device of the pressure reducing valve in the oxygen supply pressure reducing valve of the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the present invention.

[0037] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0038] See also Figure 1-9 , details of the embodiments of the present invention.

[0039] Embodiment 1: A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve, such as Figure 1-2 As shown, it includes a valve body 1, wherein a primary decompression chamber 1-2 and a secondary decompression chamber 1-4 are provided inside the valve body 1, wherein a primary decompression valve assembly is provided inside the primary decompression chamber 1-2, and wherein a secondary decompression valve assembly is provided inside the secondary decompression chamber 1-4, wherein both the primary decompression valve assembly and the secondary decompression valve assembly perform negative feedback according to a set decompression target pressure to control the pressure output and form a two-stage negative feedback decompression output.

[0040] An air inlet channel 1-1 is provided at the lower end of the valve body 1, and an oxygen supply chamber 1-6 is provided at the upper end of the valve body 1. The air inlet channel 1-1 is communicated with the input port of the first-level decompression chamber 1-2, the output port of the first-level decompression chamber 1-2 is communicated with the input port of the second-level decompression chamber 1-4 through the first-level decompression rear airway 1-3, and the output port of the second-level decompression chamber 1-4 is communicated with the oxygen supply chamber 1-6 through the second-level decompression rear airway 1-5.

[0041] The negative feedback control pressure reduction principle of the oxygen supply pressure reducing valve in this embodiment is as follows Figure 6 As shown, through the two-stage negative feedback pressure reduction output, the pressure reduction target pressure is set for negative feedback to control the pressure output, feed back the high and low changes of the gas pressure after pressure reduction, control the size of the opening of the first and second stage exhaust throttle ports, realize a lightweight, portable, highly integrated pressure reducing valve, provide a pressure-stabilized oxygen supply output system, and automatically sense the pressure changes of the cylinder under the oxygen supply state of the high-pressure cylinder to realize visualization and provide the oxygen supply output with the stable pressure required for the corresponding state after pressure reduction.

[0042] Example 2: Figure 1 As shown, the first-level pressure reducing valve assembly includes a first-level valve sleeve 2, a first-level valve core 3 and a first-level spring 4. The first-level valve sleeve 2 is fixed in the first-level pressure reducing chamber 1-2. The outer wall of the first-level valve sleeve 2 is in sealing contact with the inner wall of the first-level pressure reducing chamber 1-2 through a sealing ring. A first-level valve sleeve throttle hole 2-1 is formed on the first-level valve sleeve 2. The first-level valve sleeve throttle hole 2-1 is directly connected with the outlet of the intake channel 1-1; the first-level valve core 3 is sleeved inside the first-level valve sleeve 2, and the outer surface of the first-level valve core 3 is in dynamic sealing contact with the inner surface of the first-level valve sleeve 2 through a dynamic sealing ring. The first-level spring 4 is sleeved between the first-level valve sleeve 2 and the first-level valve core 3. The lower end of the spring 4 is pressed against the stepped surface of the inner wall of the primary valve sleeve 2, and the upper end of the primary spring 4 is pressed against the stepped surface of the outer wall of the primary valve core 3; a primary valve core center hole 3-1 is provided through the center of the primary valve core 3, and a primary valve core throttling hole 3-2 is provided on the side wall of the primary valve core 3, and the primary valve core throttling hole 3-2 is adjusted to the opening and closing degree with the primary valve sleeve throttling hole 2-1 as the primary valve core 3 moves up and down; a primary valve core lower air pressure chamber 1-2-2 is formed between the lower end surface of the primary valve core 3 and the bottom surface of the primary decompression chamber 1-2, and a primary valve core upper air pressure chamber 1-2-1 is formed between the upper end surface of the primary valve core 3 and the top surface of the primary decompression chamber 1-2.

[0043] In this embodiment, the primary spring 4 is selected according to the set decompression target pressure.

[0044] In this embodiment, the first-level negative feedback control pressure reduction working principle and process are as follows: Figure 7 As shown,

[0045] The high-pressure oxygen high-pressure pressure P0 of the gas cylinder is turned on by the stop valve knob and reaches the first-stage valve sleeve of the pressure reducing valve. It is symmetrically diverted through the first-stage valve sleeve and the high-pressure oxygen reaches the first-stage valve core cut-off position in a balanced manner. When the differential force generated by the pressure P1 after the first-stage valve core is decompressed is less than the upward thrust set by the spring, P1 feedback pushes the first-stage valve core upward. When the throttle hole of the first-stage valve core moves to the line and connects with the throttle hole of the first-stage valve sleeve, the high-pressure oxygen P0 passes through the gap of the throttling side hole, generates the pressure P1 after throttling and decompression, flows into the center hole of the first-stage valve core, and reaches the first-stage valve core upper pressure cavity and the first-stage valve core lower pressure cavity at the top and bottom of the first-stage valve core. The P1 pressure gradually increases, forming a relatively antagonistic, differential pressure difference on the first-stage valve core, and P1 feedback. When the differential pressure difference force is greater than the upward thrust of the first-stage spring, the first-stage spring is compressed and moves downward, the lateral throttle hole is cut off, and the high-pressure oxygen stops flowing into the first-stage valve core. When the first-stage decompression gas continues to flow into the second-stage pressure reducing valve core, the first-stage decompression pressure p1 continues to decrease. When the differential force is less than the upward thrust of the first-stage spring, the aforementioned P1 feedback is started again, the first-stage valve core moves upward, and the lateral throttle hole is connected, so that the P1 pressure fluctuates repeatedly around the set target pressure and within a stable range, and the P1 pressure tends to be stable.

[0046] Example 3: Figure 2 As shown, the secondary pressure reducing valve assembly includes a secondary valve sleeve 13, a secondary valve core 14, a secondary spring 15 and a pressure cover 16. The secondary valve sleeve 13 is fixed in the secondary pressure reducing chamber 1-4. The outer wall of the secondary valve sleeve 13 is in sealing contact with the inner wall of the secondary pressure reducing chamber 1-4 through a sealing ring. A secondary valve sleeve throttle hole 13-1 is formed on the secondary valve sleeve 13. The secondary valve sleeve throttle hole 13-1 is directly connected with the outlet of the primary pressure reducing airway 1-3. The secondary valve core 14 is sleeved inside the secondary valve sleeve 13. The outer surface of the secondary valve core 14 is in dynamic sealing contact with the inner surface of the secondary valve sleeve 13 through a dynamic sealing ring. A secondary valve core center hole 14-1 is provided at the center of the secondary valve core 14. A secondary valve core throttle hole 14-2 is provided on the side wall of the secondary valve core 14. The throttle hole 14-2 of the secondary valve core moves axially left and right with the secondary valve core 14 to adjust the opening and closing degree with the throttle hole 13-1 of the secondary valve sleeve; the pressure cover 16 is fixed on the port of the secondary decompression chamber 1-4, and the secondary spring 15 is arranged inside the pressure cover 16, one end of the secondary spring 15 is pressed on the spring seat in the pressure cover 16, and the other end of the secondary spring 15 is connected to the secondary valve core 14 through the spring seat; a left air pressure chamber 1-4-1 of the secondary valve core is formed between the left end face of the secondary valve core 14 and the bottom face of the left end of the secondary decompression chamber 1-4, and a right air pressure chamber 1-4-2 of the secondary valve core is formed between the middle step surface of the outer wall of the secondary valve core 14 and the middle step surface of the inner wall of the secondary valve sleeve 13, and the right air pressure chamber 1-4-2 is connected with the center hole 14-1 of the secondary valve core through the side air hole.

[0047] In this embodiment, the secondary spring 15 is selected according to the set decompression target pressure.

[0048] In this embodiment, the oxygen supply pressure reducing valve secondary negative feedback control pressure reducing working principle and process: Figure 8 As shown,

[0049] After the first-stage negative feedback control, the pressure P1 oxygen reaches the secondary valve sleeve after the pressure reduction, and is symmetrically diverted through the secondary valve sleeve. The pressure P1 oxygen reaches the secondary valve core cut-off position in a balanced manner. When the resultant force of the pressure P2 generated by the secondary valve core after the pressure reduction is less than the reverse thrust set by the secondary spring, the P2 feedback pushes the secondary valve core to move to the left. When the throttle hole of the secondary valve core moves to connect with the throttle hole of the secondary valve sleeve, the pressure oxygen P1 passes through the gap of the throttle side hole, generates the pressure P2 after the throttle pressure reduction, flows into the center hole of the secondary valve core, and reaches the left air pressure chamber of the secondary valve core and the right air pressure chamber of the secondary valve core on the left side of the secondary valve core. P2 The pressure gradually increases, forming a relative force on the secondary valve core, P2 feedback. When the resultant force is greater than the leftward thrust of the secondary spring, the secondary spring is compressed, the secondary valve core moves to the right, the lateral throttle hole is cut off, and the high-pressure oxygen stops flowing into the secondary valve core. When the secondary decompression gas continues to flow into the oxygen breathing and exhaust device, the secondary decompression pressure P2 continues to decrease. When the resultant force is less than the leftward thrust of the secondary spring, the aforementioned P2 feedback is started again, the secondary valve core moves to the left, and the secondary lateral throttle hole is connected, so as to keep the P2 pressure fluctuating repeatedly within the set target pressure and stable range, and the P2 pressure tends to be stable.

[0050] Example 4: Figure 1 As shown, a cover plate 17 is provided at the bottom of the oxygen supply chamber 1-6, a fixed seat Ⅱ23 is provided in the oxygen supply chamber 1-6, an air gap 1-7 is formed between the lower surface of the fixed seat Ⅱ23 and the cover plate 17, and the output port of the secondary decompression chamber 1-4 is connected with the air gap 1-7 through the secondary decompression rear airway 1-5; an air outlet channel 1-8 is provided on the side wall of the valve body 1, an air outlet valve plate 6 is fixed on the fixed seat Ⅱ23 by a pressure cap 7, and the air outlet valve plate 6 is connected with the air outlet channel 1-8 through the airway provided on the fixed seat Ⅱ23, and an air outlet nozzle 8 is provided on the air outlet channel 1-8.

[0051] In this embodiment, Figure 2 As shown, a bead 19 is provided on the upper portion of the fixing seat II 23, the upper opening of the oxygen supply chamber 1-6 is covered by the fixing seat I 18, an indicator plate 20 is provided on the upper portion of the fixing seat I 18, the indicator plate 20 is limited by a limit pin 5, a mode selection handle 21 is provided on the upper portion of the indicator plate 20, and a status indicator 22 is provided on the mode selection handle 21.

[0052] In this embodiment, other structures in the oxygen supply pressure reducing valve are manufactured according to conventional settings in the prior art and will not be described in detail in this embodiment.

[0053] In this embodiment, the oxygen absorption and exhaust principle of the pressure reducing valve is as follows Fig. 9 As shown:

[0054] After two negative feedback control decompressions, the pressure in the high-pressure gas cylinder is greatly reduced and relatively stable. After the second-level decompression P2 enters the oxygen inhalation and exhaust device, it enters the large space again to expand and release the decompression, and the pressure is more stable. Adjust the mode selection handle, and after passing through different air outlet aperture valves, you will get different modes of air outlet pressure P3 and air outlet volume. Adjust the mode to the corresponding state of medical treatment, plateau hypoxia environment, mountaineering, sports, elderly heart, lung, and brain hypoxia rescue, you can get the corresponding state of air outlet pressure P3 and corresponding air outlet volume to meet the needs of different groups of people.

[0055] In this embodiment, the status prompter will provide people with basic information needs such as time, place, location, direction, altitude, exercise distance, exercise steps, and calorie consumption.

[0056] Embodiment 5: A stop valve 12 is provided on the air intake passage 1 - 1 . The stop valve 12 adopts a needle valve core or a ball valve core. An adjusting knob 11 for adjusting the stop valve 12 is provided on one side of the lower part of the valve body 1 .

[0057] In this embodiment, when the stop valve adopts a needle valve, the structure is as follows: Figure 1 and 2 As shown; when the stop valve adopts a ball valve, the structure is as follows Figure 4 and 5 As shown, the rest of the structure is universal, standardized and modular. The front stop valve ensures that the pressure reducer is in a normal pressure state when the pressure reducing valve is not working. When the pressure reducing valve is not used for a long time, the service life of the sealing ring of the pressure reducing valve is increased, fatigue damage is prevented, and the high-pressure gas cylinder is ensured not to leak.

[0058] In this embodiment, a pressure gauge 24 is provided on one side of the valve body 1. The pressure gauge 24 is connected to the air inlet channel 1-1 through an air passage and is used to monitor and display the air pressure in the high-pressure oxygen cylinder.

[0059] In this embodiment, a gas filling nozzle 9 is provided on one side of the valve body 1. The gas filling nozzle 9 is connected to the air inlet channel 1-1 through an air channel and is used to fill the gas cylinder.

[0060] In this embodiment, Figure 3 As shown, a pressure relief hole 25 is provided on the side wall of the valve body 1, and the pressure relief hole 25 is communicated with the air intake channel 1-1. A safety valve 26 is provided on the pressure relief hole 25; and a filter screen 10 is provided on the air intake channel 1-1.

[0061] This portable automatic control pressure-stabilizing oxygen supply pressure reducing valve is used for medical treatment, elderly heart, lung, brain hypoxia, plateau hypoxia, mountaineering, sports oxygen supply, life support, and rescue systems. It uses the negative feedback pressure reduction automatic control principle and controls the pressure output through two-level control pressure negative feedback to achieve the stable pressure oxygen supply output required for the corresponding state when the pressure reaches normal, sports, mountaineering, and plateau hypoxia.

[0062] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0063] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve, comprising a valve body (1), characterized in that: The valve body (1) is provided with a primary pressure-reducing chamber (1-2) and a secondary pressure-reducing chamber (1-4) inside, the primary pressure-reducing chamber (1-2) is provided with a primary pressure-reducing valve assembly inside, the secondary pressure-reducing chamber (1-4) is provided with a secondary pressure-reducing valve assembly inside, the primary pressure-reducing valve assembly and the secondary pressure-reducing valve assembly both automatically control the pressure output by performing negative feedback according to a set pressure-reducing target pressure and form a two-stage negative feedback pressure-reducing output; An air inlet channel (1-1) is provided at the lower end of the valve body (1), and an oxygen supply chamber (1-6) is provided at the upper end of the valve body (1); the air inlet channel (1-1) is communicated with an input port of a first-stage decompression chamber (1-2); an output port of the first-stage decompression chamber (1-2) is communicated with an input port of a second-stage decompression chamber (1-4) via an airway (1-3) after the first-stage decompression; and an output port of the second-stage decompression chamber (1-4) is communicated with the oxygen supply chamber (1-6) via an airway (1-5) after the second-stage decompression; an air filling nozzle (9) is provided on one side of the valve body (1), and the air filling nozzle (9) is communicated with the air inlet channel (1-1) via an airway.

2. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve according to claim 1, characterized in that: The first-stage pressure reducing valve assembly comprises a first-stage valve sleeve (2), a first-stage valve core (3) and a first-stage spring (4); the first-stage valve sleeve (2) is fixed in the first-stage pressure reducing chamber (1-2); the outer wall of the first-stage valve sleeve (2) is in sealing contact with the inner wall of the first-stage pressure reducing chamber (1-2); a first-stage valve sleeve throttle hole (2-1) is formed on the first-stage valve sleeve (2); the first-stage valve sleeve throttle hole (2-1) is directly connected to the outlet of the air inlet passage (1-1); the first-stage valve core (3) is sleeved inside the first-stage valve sleeve (2); the outer surface of the first-stage valve core (3) is in dynamic sealing contact with the inner surface of the first-stage valve sleeve (2); the first-stage spring (4) is sleeved between the first-stage valve sleeve (2) and the first-stage valve core (3); the lower end of the first-stage spring (4) is pressed against the first-stage valve sleeve (2) and the first-stage valve core (3) is pressed against the first-stage valve sleeve (2) and the first-stage valve core (3) is pressed against the first-stage valve sleeve (2) and the first-stage valve core (3) is pressed against the first-stage valve sleeve (2) and the first-stage valve sleeve (3) is pressed against the first-stage valve sleeve (2) and the first-stage valve sleeve (3) is pressed against the first-stage spring (4) and the first-stage valve sleeve (2) is pressed against the first-stage valve sleeve (2) and the first-stage valve core (3) is pressed against the first-stage valve sleeve (2) and the first-stage valve sleeve ... spring (4) and the first-stage valve sleeve On the stepped surface of the inner wall of the primary valve sleeve (2), the upper end of the primary spring (4) is pressed against the stepped surface of the outer wall of the primary valve core (3); a primary valve core center hole (3-1) is provided through the center of the primary valve core (3), and a primary valve core throttling hole (3-2) is provided on the side wall of the primary valve core (3); the primary valve core throttling hole (3-2) can be adjusted in size with the primary valve sleeve throttling hole (2-1) as the primary valve core (3) moves up and down; a primary valve core lower air pressure chamber (1-2-2) is formed between the lower end surface of the primary valve core (3) and the bottom surface of the primary decompression chamber (1-2), and a primary valve core upper air pressure chamber (1-2-1) is formed between the upper end surface of the primary valve core (3) and the top surface of the primary decompression chamber (1-2).

3. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve according to claim 2, characterized in that: The secondary pressure reducing valve assembly comprises a secondary valve sleeve (13), a secondary valve core (14), a secondary spring (15) and a pressure cover (16); the secondary valve sleeve (13) is fixed in the secondary pressure reducing chamber (1-4); the outer wall of the secondary valve sleeve (13) is in sealing contact with the inner wall of the secondary pressure reducing chamber (1-4); a secondary valve sleeve throttling hole (13-1) is formed on the secondary valve sleeve (13); the secondary valve sleeve throttling hole (13-1) is directly connected with the outlet of the primary pressure reducing airway (1-3); the secondary valve core (14) is sleeved inside the secondary valve sleeve (13); the outer surface of the secondary valve core (14) is in dynamic sealing contact with the inner surface of the secondary valve sleeve (13); a secondary valve core center hole (14-1) is provided at the center of the secondary valve core (14); a secondary valve core throttling hole (14-2) is provided on the side wall of the secondary valve core (14); the secondary valve core throttling hole (14-3) is directly connected with the outlet of the primary pressure reducing airway (1-3); the secondary valve core (14) is sleeved inside the secondary valve sleeve (13); the outer surface of the secondary valve core (14) is in dynamic sealing contact with the inner surface of the secondary valve sleeve (13); a secondary valve core center hole (14-1) is provided at the center of the secondary valve core (14); a secondary valve core throttling hole (14-2) is provided on the side wall of the secondary valve core (14); 14-2) As the secondary valve core (14) moves axially to the left and right, the opening and closing degree of the secondary valve sleeve throttle hole (13-1) can be adjusted; the pressure cover (16) is fixed on the port of the secondary decompression chamber (1-4), and the secondary spring (15) is arranged inside the pressure cover (16), one end of the secondary spring (15) is pressed against the spring seat inside the pressure cover (16), and the other end of the secondary spring (15) is connected to the secondary valve core (14) through the spring seat; a left air pressure chamber (1-4-1) of the secondary valve core is formed between the left end surface of the secondary valve core (14) and the left end bottom surface of the secondary decompression chamber (1-4), and a right air pressure chamber (1-4-2) of the secondary valve core is formed between the middle step surface of the outer wall of the secondary valve core (14) and the middle step surface of the inner wall of the secondary valve sleeve (13), and the right air pressure chamber (1-4-2) is connected to the center hole (14-1) of the secondary valve core through the side air hole.

4. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve according to claim 3, characterized in that: The primary spring (4) and the secondary spring (15) are selected according to the set pressure reduction target pressure.

5. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve according to claim 1, characterized in that: A cover plate (17) is provided at the bottom of the oxygen supply chamber (1-6), a fixed seat II (23) is provided in the oxygen supply chamber (1-6), an air gap (1-7) is formed between the lower surface of the fixed seat II (23) and the cover plate (17), and the output port of the secondary decompression chamber (1-4) is connected with the air gap (1-7) through the secondary decompression rear airway (1-5); an air outlet channel (1-8) is provided on the side wall of the valve body (1), an air outlet valve plate (6) is fixed on the fixed seat II (23) through a pressure cap (7), the air outlet valve plate (6) is connected with the air outlet channel (1-8) through an airway provided on the fixed seat II (23), and an air outlet nozzle (8) is provided on the air outlet channel (1-8).

6. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve according to claim 1, characterized in that: A bead (19) is provided on the upper portion of the fixing seat II (23); the upper opening of the oxygen supply chamber (1-6) is covered by the fixing seat I (18); an indicator plate (20) is provided on the upper portion of the fixing seat I (18); a mode selection handle (21) is provided on the upper portion of the indicator plate (20); and a status indicator (22) is provided on the mode selection handle (21).

7. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve according to claim 1, characterized in that: The air inlet passage (1-1) is provided with a stop valve (12), the stop valve (12) adopts a needle valve core or a ball valve core, and a regulating knob (11) for regulating the stop valve (12) is provided on one side of the lower part of the valve body (1).

8. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve according to claim 1, characterized in that: A pressure gauge (24) is provided on one side of the valve body (1), and the pressure gauge (24) is connected to the air inlet channel (1-1) through an air passage.

9. A portable two-stage negative feedback pressure automatic control oxygen supply pressure reducing valve according to claim 1, characterized in that: A pressure relief hole (25) is provided on the side wall of the valve body (1), the pressure relief hole (25) is in communication with the air intake passage (1-1), a safety valve (26) is provided on the pressure relief hole (25); and a filter screen (10) is provided on the air intake passage (1-1).

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