Two-stage oxygen supply pressure reducing valve with negative feedback pressure control

Abstract

The utility model provides a two-stage oxygen supply pressure reducing valve with negative feedback pressure control, 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 utility model belongs to valve technical field, concretely relates to a two-stage oxygen supply pressure reducing valve with negative feedback pressure control. BACKGROUND

[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 the plateau hypoxic environment, mountaineering, sports, old heart, lung and brain hypoxia rescue, various types of portable oxygen supply equipment with pressure reducing valve device are also in great demand. The working principles and structures of these equipment are various, but few of them can achieve automatic sensing pressure output change, negative feedback automatic control, visualization, stable pressure oxygen supply output and stable pressure oxygen supply output.

[0003] The existing mature pressure reducing valves with negative feedback control are generally pressure reducing control valves with pilot or direct pilot valves, such as pilot negative feedback pressure reducing valves and direct pilot negative feedback pressure reducing valves. These pressure reducing valves feed the pressure after pressure reduction to the pilot valve or the direct pilot valve, and compare the pilot valve with the set pressure to control the opening and closing degree of the gate valve, so as to control the size of the output pressure after pressure reduction. These pressure reducing valves are generally used in liquid, large-flow and large-diameter pipe networks of chemical industry and urban water supply systems.

[0004] In the medical, welding and other industries, high-pressure gases such as oxygen, nitrogen and acetylene generally use one-stage or two-stage pressure reducing valves. The high-pressure gas is reduced in pressure by diffusing in the diffusion chamber after throttling. There is no low-pressure negative feedback after pressure reduction to control the opening and closing degree of the pressure reducing valve gate. The pressure after pressure reduction will decrease with the decrease of the pressure of the high-pressure cylinder. Therefore, it is necessary to artificially adjust the control pressure. Most portable pressure reducers are derived structures of this structure.

[0005] In the medical, welding and other industries, high-pressure gases such as oxygen, nitrogen and acetylene generally use one-stage or two-stage pressure reducing valves. The high-pressure gas is reduced in pressure by diffusing in the diffusion chamber after throttling. There is no low-pressure negative feedback after pressure reduction to control the opening and closing degree of the pressure reducing valve gate. The pressure after pressure reduction will decrease with the decrease of the pressure of the high-pressure cylinder. Therefore, it is necessary to artificially adjust the control pressure. Most portable pressure reducers are derived structures of this structure.

[0006] Among them, the publication number CN114949529 A discloses a kind of oxygen supply valve with multi-stage pressure reducing function. Although the oxygen supply valve can realize multi-stage pressure reduction on the oxygen output by gas cylinder, makes the oxygen supply more stable, improves the use effect of user oxygen inhalation. However, the oxygen supply valve has the following defects:

[0007] This is a portable pressure reducing valve, the back pressure of the primary pressure reducing valve controlling the opening and closing of the valve core is formed by throttling the cylinder pressure through the side of the valve core, transmitting the reduced pressure to the back of the primary valve core, and comparing the resultant force of the set spring force and the high pressure of the small diameter of the valve core, to form the opening and closing of the gate valve, when the back pressure and force is less than the set spring force, the gate tends to open, when the back pressure and force is greater than the set spring force, the gate tends to close, and the pressure of the small diameter of the valve core is the same as the cylinder pressure and decreases with the decrease of the cylinder pressure, so the primary pressure reducing pressure has no feedback relationship with the opening and closing of the primary pressure reducing gate, and with the decrease of the cylinder pressure, the output pressure of the primary pressure reducing valve also decreases, the pressure of the primary pressure reducing valve is unstable during use, and it is a gradual decrease process; at the same time, since the control valve entering the primary pressure reducing valve is a gate valve, the opening and closing degree is large, the relative high pressure gas has good flowability and is difficult to seal, the throttling pressure reducing effect is poor, with the opening and closing of the gate valve, high pressure gas with high gradient and large pulsation enters the primary pressure reducing chamber, which further aggravates the instability of the output pressure of the primary pressure reducing valve, and the output pressure has large gradient and pulsation.

[0008] The secondary pressure reducing process is similar to that of the primary pressure reducing valve, the secondary spring sets the secondary pressure reducing force, and the combined force of the secondary output pressure and the primary output pressure acting on the outer end face of the secondary gate valve is needed to open the secondary gate valve, and the pressure after the primary pressure reducing is gathered and released to the secondary pressure reducing space through the opened secondary gate valve, instead of being throttled and reduced, in the process of opening and closing of the valve, the output pressure after pressure reducing forms a stepped and pulsed impact pressure and output, and the secondary pressure output is unstable.

[0009] Since the high pressure gas has good flowability and is difficult to seal, if the primary pressure reducing gate valve is not sealed well and leaks, the high pressure of the cylinder will directly reach the outer end face of the secondary gate valve, the secondary pressure reducing spring will not be able to overcome the pressure of the sum of the pressure in the secondary pressure reducing chamber and the pressure of the secondary gate valve, the secondary gate valve will not be able to open, the pressure reducing gas will not be able to enter the secondary pressure reducing chamber, there will be pressure in the high pressure cylinder, the secondary pressure reducing valve will not be able to work effectively, the pressure reducing valve will not be able to output gas from the outlet, and the pressure reducing valve will fail.

[0010] Based on the 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. Invention content

[0011] The utility model solves technical problem: provide a kind of two-stage oxygen supply pressure reducing valve with negative feedback pressure control, the utility model aims at using automatic control principle, and pressure output is automatically controlled by two-stage control pressure negative feedback, realizes pressure reaches medical, old heart, lung, brain hypoxia rescue, sports, mountain climbing, plateau hypoxia state, provides the stable pressure of the oxygen supply output of the required pressure reducing valve equipment of corresponding state.

[0012] To achieve the above object, the utility model adopts technical scheme:

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

[0014] The lower end of the valve body is provided with an air inlet channel, and the upper end of the valve body is provided with an oxygen supply chamber.

[0015] Further limit to the above scheme, the primary pressure reducing valve assembly includes a primary valve sleeve, a primary valve core and a primary spring, the primary valve sleeve is fixed in the primary pressure reducing chamber, the outer wall of the primary valve sleeve is in sealing contact with the inner wall of the primary pressure reducing chamber, the primary valve sleeve is provided with a primary valve sleeve throttle hole, and the primary valve sleeve throttle hole is in direct communication with the outlet of the air inlet channel;The primary valve core is sleeved in the primary valve sleeve, the outer surface of the primary valve core is in dynamic sealing contact with the inner surface of the primary valve sleeve, the primary spring is sleeved between the primary valve sleeve and the primary valve core, the lower end of the primary spring is on the stepped surface of the inner wall of the primary valve sleeve, and the upper end of the primary spring is on the stepped surface of the outer wall of the primary valve core;The primary valve core is provided with a primary valve core center hole in the center, and the primary valve core is provided with a primary valve core throttle hole on the side wall, the primary valve core throttle hole adjusts the opening and closing degree of the primary valve sleeve throttle hole by moving up and down;The lower end surface of the primary valve core and the bottom surface of the primary pressure reducing chamber form a primary valve core lower air pressure chamber, and the upper end surface of the primary valve core and the top surface of the primary pressure reducing chamber form a primary valve core upper air pressure chamber.

[0016] In furtherance of the above-mentioned solution, the secondary pressure reducing valve assembly comprises a secondary valve sleeve, a secondary valve core, a secondary spring and a gland. The secondary valve sleeve is fixed in the secondary pressure reducing chamber, and the outer wall of the secondary valve sleeve is in sealing contact with the inner wall of the secondary pressure reducing chamber. A secondary valve sleeve throttling hole is formed on the secondary valve sleeve, and the secondary valve sleeve throttling hole is in communication with the outlet of the first-stage pressure reducing gas channel. The secondary valve core is sleeved in the secondary valve sleeve, and the outer surface of the secondary valve core is in dynamic sealing contact with the inner surface of the secondary valve sleeve. A secondary valve core center hole is arranged in the center of the secondary valve core, and a secondary valve core throttling hole is arranged on the side wall of the secondary valve core. The opening and closing degree of the secondary valve core throttling hole is adjusted by moving the secondary valve core axially left and right. The gland is fixed on the port of the secondary pressure reducing chamber, and the secondary spring is arranged in the interior of the gland. One end of the secondary spring is abutted against a spring seat in the interior of the gland, and the other end of the secondary spring is connected with the secondary valve core through the spring seat. The left end surface of the secondary valve core and the left end bottom surface of the secondary pressure reducing chamber form a secondary valve core left gas pressure chamber, and the middle stepped surface of the outer wall of the secondary valve core and the middle stepped surface of the inner wall of the secondary valve sleeve form a secondary valve core right gas pressure chamber. The right gas pressure chamber is in communication with the secondary valve core center hole through a side gas hole.

[0017] In furtherance of the above-mentioned solution, the first-stage spring and the secondary spring are selected according to the set pressure reducing target pressure.

[0018] In furtherance of the above-mentioned solution, the bottom of the oxygen supply chamber is provided with a cover plate, a fixed seat II is arranged in the oxygen supply chamber, an air passing gap is formed between the lower surface of the fixed seat II and the cover plate, and the outlet of the secondary pressure reducing chamber is in communication with the air passing gap through a secondary pressure reducing gas channel. An air outlet channel is arranged on the side wall of the valve body, an air outlet valve piece is fixed on the fixed seat II through a pressure cap, the air outlet valve piece is in communication with the air outlet channel through an air channel arranged on the fixed seat II, and an air outlet nozzle is arranged on the air outlet channel.

[0019] In furtherance of the above-mentioned solution, a pearl hitting device is arranged on the upper portion of the fixed seat II, the upper opening of the oxygen supply chamber is covered by a fixed seat I, an indication plate is arranged on the upper portion of the fixed seat I, a mode selection handle is arranged on the upper portion of the indication plate, and a state prompter is arranged on the mode selection handle.

[0020] In furtherance of the above-mentioned solution, a stop valve is arranged on the air inlet channel. The stop valve adopts a needle valve core or a ball valve core. An adjusting knob for adjusting the stop valve is arranged on one side of the lower portion of the valve body, so as to open or close the high-pressure gas cylinder to supply the pressure reducing valve.

[0021] In furtherance of the above-mentioned solution, a pressure gauge is arranged on one side of the valve body, and the pressure gauge is in communication with the air inlet channel through an air channel.

[0022] Further, the valve body side wall is provided with a pressure relief hole, the pressure relief hole is communicated with the air inlet channel, and the pressure relief hole is provided with a safety valve; and the air inlet channel is provided with a filter screen.

[0023] Compared with the prior art, the utility model has the advantages of:

[0024] 1. The oxygen supply pressure reducing valve of the scheme is automatically controlled to output by two-stage pressure reduction negative feedback, sets a pressure reduction target pressure for negative feedback, automatically controls pressure output, feeds back high and low changes of the gas pressure after pressure reduction, controls sizes of opening degrees of first-stage and second-stage exhaust throttles, reaches stable target output pressure, realizes lightweight, portable and highly integrated pressure reducing valve, provides stable pressure oxygen supply output system, automatically senses pressure changes of the gas cylinder in the oxygen supply state of the high-pressure cylinder, realizes visualization, and provides required stable pressure oxygen output after pressure reduction in the corresponding state;

[0025] 2. The portable automatic control stable pressure oxygen supply pressure reducing valve of the scheme is used for medical treatment, old heart, lung and brain hypoxia, high altitude hypoxia, mountain climbing, sports oxygen supply, life guarantee and rescue system. By using the negative feedback pressure reduction automatic control principle, pressure output is automatically controlled by two-stage control pressure negative feedback, stable pressure oxygen output required in the corresponding state is provided under the conditions of normal pressure, sports, mountain climbing and high altitude hypoxia. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model;

[0027] Figure 2 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model; Figure 1 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model;

[0028] Figure 3 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model;

[0029] Figure 4 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model;

[0030] Figure 5 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model; Figure 4 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model;

[0031] Figure 6 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model;

[0032] Figure 7 It is a two-stage negative feedback pressure control oxygen supply pressure reducing valve (needle valve) structural schematic view of the utility model;

[0033] Figure 8 Figure 2 is a schematic diagram of a two-stage negative feedback pressure control in the oxygen supply pressure reducing valve of the present application;

[0034] Figure 9 Figure 3 is a schematic diagram of an oxygen suction and exhaust device of the pressure reducing valve in the oxygen supply pressure reducing valve of the present application. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it should not be understood as a limitation on the present application.

[0037] It should be noted that in this document, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0038] Please refer to Figures 1-9 for detailed description of the embodiments of the present application.

[0039] Embodiment 1: Two-stage oxygen supply pressure reducing valve with negative feedback pressure control, as shown in Figures 1-2 Figure 1, comprising a valve body 1, a first-stage pressure reducing chamber 1-2 and a second-stage pressure reducing chamber 1-4 are arranged inside the valve body 1, a first-stage pressure reducing valve assembly is arranged inside the first-stage pressure reducing chamber 1-2, a second-stage pressure reducing valve assembly is arranged inside the second-stage pressure reducing chamber 1-4, the first-stage pressure reducing valve assembly and the second-stage pressure reducing valve assembly are both controlled by negative feedback according to the set pressure reducing target pressure to control the pressure output and form two-stage negative feedback pressure reducing output.

[0040] The lower end of the valve body 1 is provided with an air inlet channel 1-1, and the upper end of the valve body 1 is provided with an oxygen supply chamber 1-6. The air inlet channel 1-1 is connected to the input port of the primary pressure reducing chamber 1-2. The output port of the primary pressure reducing chamber 1-2 is connected to the input port of the secondary pressure reducing chamber 1-4 through the primary pressure reducing airway 1-3. The output port of the secondary pressure reducing chamber 1-4 is connected to the oxygen supply chamber 1-6 through the secondary pressure reducing 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, a two-stage negative feedback pressure reduction output is achieved by setting a target pressure for pressure reduction and using negative feedback to control the pressure output. The feedback of high and low gas pressure changes after pressure reduction controls the size of the opening of the first and second stage exhaust throttle ports, realizing a lightweight, portable, and highly integrated pressure reducing valve. It provides a stable pressure 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 stable pressure oxygen supply output required for the corresponding state after pressure reduction.

[0042] Example 2: As Figure 1 As shown, the primary pressure reducing valve assembly includes a primary valve sleeve 2, a primary valve core 3, and a primary spring 4. The primary valve sleeve 2 is fixed in the primary pressure reducing chamber 1-2. The outer wall of the primary valve sleeve 2 is in sealed contact with the inner wall of the primary pressure reducing chamber 1-2 through a sealing ring. The primary valve sleeve 2 has a primary valve sleeve throttling orifice 2-1, which is directly connected to the outlet of the intake channel 1-1. The primary valve core 3 is sleeved inside the primary valve sleeve 2. The outer surface of the primary valve core 3 is in dynamic sealing contact with the inner surface of the primary valve sleeve 2 through a dynamic sealing ring. The primary spring 4 is sleeved between the primary valve sleeve 2 and the primary valve core 3. The lower end of the spring 4 rests on the stepped surface of the inner wall of the first-stage valve sleeve 2, and the upper end of the first-stage spring 4 rests on the stepped surface of the outer wall of the first-stage valve core 3. The first-stage valve core 3 has a through-hole 3-1, and a throttling orifice 3-2 is provided on the side wall of the first-stage valve core 3. The opening and closing degree of the throttling orifice 3-2 is adjusted with the up and down movement of the first-stage valve core 3. The lower end face of the first-stage valve core 3 and the bottom surface of the first-stage pressure reducing chamber 1-2 form a lower pressure chamber 1-2-2, and the upper end face of the first-stage valve core 3 and the top surface of the first-stage pressure reducing chamber 1-2 form an upper pressure chamber 1-2-1.

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

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

[0045] The high-pressure oxygen P0 from the cylinder is opened by the shut-off valve knob and reaches the first-stage valve sleeve of the pressure reducing valve. After symmetrical flow distribution through the first-stage valve sleeve, the high-pressure oxygen reaches the shut-off position of the first-stage valve core evenly. When the differential resultant force generated by the pressure P1 after pressure reduction of the first-stage valve core is less than the upward thrust set by the spring, P1 pushes the first-stage valve core upward. When the throttling orifice of the first-stage valve core moves to connect with the throttling orifice of the first-stage valve sleeve, the high-pressure oxygen P0 passes through the throttling side hole gap, generating the pressure P1 after pressure reduction, and flows into the center hole of the first-stage valve core, reaching the upper and lower pressure chambers of the first-stage valve core. The pressure P1 gradually increases, forming a relatively opposing differential pressure difference in the first-stage valve core. P1 feedback occurs, and when the resultant force of the differential pressure difference is greater than the upward thrust of the first-stage spring, the first-stage spring is compressed and moves downward, the lateral throttle orifice is cut off, and high-pressure oxygen stops flowing into the first-stage valve core. As the depressurized gas from the first stage continuously flows into the second-stage pressure reducing valve core, the pressure P1 of the first-stage pressure reducing valve continuously decreases. When the resultant force of the differential pressure difference is less than the upward thrust of the first-stage spring, the aforementioned P1 feedback is activated again, the first-stage valve core moves upward, and the lateral throttle orifice is connected. The pressure P1 is maintained within a stable range around the set target pressure, and the pressure P1 tends to stabilize.

[0046] Example 3: As 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 cap 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 sealed contact with the inner wall of the secondary pressure reducing chamber 1-4 through a sealing ring. The secondary valve sleeve 13 has a secondary valve sleeve throttling orifice 13-1, which is directly connected to the outlet of the air passage 1-3 after the primary pressure reducing process. 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. The secondary valve core 14 has a secondary valve core center hole 14-1 at its center and a secondary valve core throttling orifice 14-2 on its side wall. The opening and closing degree of the throttling orifice 14-2 of the secondary valve core is adjusted by the axial left and right movement of the secondary valve core 14 and the throttling orifice 13-1 of the secondary valve sleeve. The pressure cap 16 is fixed on the port of the secondary pressure reducing chamber 1-4. The secondary spring 15 is set inside the pressure cap 16. One end of the secondary spring 15 rests on the spring seat inside the pressure cap 16, and the other end of the secondary spring 15 is connected to the secondary valve core 14 through the spring seat. The left end face of the secondary valve core 14 and the bottom left end face of the secondary pressure reducing chamber 1-4 form the left air pressure chamber 1-4-1 of the secondary valve core. The middle stepped surface of the outer wall of the secondary valve core 14 and the middle stepped surface of the inner wall of the secondary valve sleeve 13 form the right air pressure chamber 1-4-2 of the secondary valve core. 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.

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

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

[0049] After the pressure P1 of the oxygen gas after the primary negative feedback control is reduced, the pressure P1 of the oxygen gas reaches the secondary valve sleeve, is symmetrically divided through the secondary valve sleeve, and reaches the secondary valve core stop position. When the secondary valve core is reduced, the resultant force of the pressure P2 is less than the reverse thrust of the secondary spring, the P2 feedback pushes the secondary valve core to move to the left, when the secondary valve core orifice moves to the secondary valve sleeve orifice, the pressure oxygen P1 passes through the orifice gap, the pressure P2 after the orifice pressure reduction is generated, flows into the secondary valve core center hole, reaches the secondary valve core left gas pressure cavity and the secondary valve core right gas pressure cavity, and the P2 pressure gradually rises, the secondary valve core forms a counteracting force, 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 orifice is cut off, and the high-pressure oxygen gas stops flowing into the secondary valve core. When the secondary reduced gas continuously flows into the oxygen inhalation exhaust device, the pressure P2 of the secondary reduced gas continuously decreases, 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, the secondary lateral orifice is connected, the P2 pressure is kept in the set target pressure, and the stable range is repeatedly fluctuated, and the P2 pressure tends to be stable.

[0050] As shown in Figure 1 , the oxygen supply chamber 1-6 is provided with a cover plate 17 at the bottom, a fixed seat II 23 is arranged 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 secondary pressure reducing chamber 1-4 output port is communicated with the air gap 1-7 through a secondary reduced gas passage 1-5; an air outlet channel 1-8 is arranged on the side wall of the valve body 1, an air outlet valve piece 6 is fixed on the fixed seat II 23 through a pressure cap 7, the air outlet valve piece 6 is communicated with the air outlet channel 1-8 through an air passage arranged on the fixed seat II 23, and an air outlet nozzle 8 is arranged on the air outlet channel 1-8.

[0051] As shown in Figure 2 , the upper part of the fixed seat II 23 is provided with a pearl hitting device 19, the upper opening of the oxygen supply chamber 1-6 is covered by a fixed seat I 18, the upper part of the fixed seat I 18 is provided with an indicator plate 20, the indicator plate 20 is limited by a limiting pin 5, the upper part of the indicator plate 20 is provided with a mode selection handle 21, and the mode selection handle 21 is provided with a state prompter 22.

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

[0053] In this embodiment, the oxygen absorption exhaust principle of the pressure reducing valve is as shown in Figure 9

[0054] After two times of negative feedback control and pressure reduction, the pressure of the high-pressure cylinder is greatly reduced and is relatively stable. The secondary pressure P2 enters the oxygen absorption exhaust device and is again expanded and released for pressure reduction in a large space, and the pressure is more stable. After the adjustment mode selection handle passes through different gas outlet aperture valve pieces, different modes of gas outlet pressure P3 and gas outlet amount can be obtained. By adjusting the mode to the corresponding state of medical treatment, high-altitude hypoxia environment, mountaineering, sports, old age heart, lung, and brain hypoxia rescue, the corresponding state of gas outlet pressure P3 and corresponding gas outlet amount can be obtained, thereby meeting the needs of different groups of people.

[0055] In this embodiment, the state prompter provides basic information needs of people, such as time, place, position, direction, altitude, movement distance, movement step number, and heat consumption.

[0056] In embodiment 5, a stop valve 12 is arranged on the gas inlet channel 1-1, the stop valve 12 adopts a needle valve spool or a ball valve spool, and an adjustment knob 11 for adjusting the stop valve 12 is arranged 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 shown in Figure 1 and 2 When the stop valve adopts a ball valve, the structure is as shown in Figure 4 and 5 The rest of the structure is designed to be universal, standardized, and modularized. The front stop valve ensures that the pressure reducer is in a normal pressure state when the pressure reducing valve does not work. In the state of long-term non-use of the pressure reducing valve, the service life of the sealing ring of the pressure reducing valve is improved, fatigue damage is prevented, and the high-pressure cylinder is ensured not to leak.

[0058] In this embodiment, a pressure gauge 24 is arranged on one side of the valve body 1, the pressure gauge 24 is communicated with the gas inlet channel 1-1 through a gas channel, and is used for monitoring and displaying the gas pressure in the high-pressure oxygen cylinder.

[0059] In this embodiment, a gas filling nozzle 9 is arranged on one side of the valve body 1, the gas filling nozzle 9 is communicated with the gas inlet channel 1-1 through a gas channel, and is used for filling gas in the cylinder.

[0060] In this embodiment, as shown in Figure 3 A pressure relief hole 25 is arranged on the side wall of the valve body 1, the pressure relief hole 25 is communicated with the gas inlet channel 1-1, a safety valve 26 is arranged on the pressure relief hole 25, and a filter screen 10 is arranged on the gas inlet channel 1-1.

[0061] ​The portable automatic control pressure supply oxygen pressure reducing valve is used for medical treatment, old heart, lung, brain hypoxia, high altitude hypoxia, mountain climbing, sports oxygen supply, life guarantee, rescue system. The pressure is controlled by two-stage control pressure negative feedback to control pressure output, and the stable pressure oxygen output required in normal, sports, mountain climbing, high altitude hypoxia state is realized.

[0062] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be realized in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0063] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can be properly combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. Two-stage pressure reducing valve with negative feedback pressure control for oxygen supply, comprising a valve body (1), characterized in that: The valve body (1) is internally provided with a first-stage pressure reduction chamber (1-2) and a second-stage pressure reduction chamber (1-4), the first-stage pressure reduction chamber (1-2) is internally provided with a first-stage pressure reduction valve assembly, the second-stage pressure reduction chamber (1-4) is internally provided with a second-stage pressure reduction valve assembly, and the first-stage pressure reduction valve assembly and the second-stage pressure reduction valve assembly are both automatically controlled in pressure output by negative feedback according to a set pressure reduction target pressure and form two-stage negative feedback pressure reduction output. The valve body (1) is internally provided with a first-stage pressure reduction chamber (1-2) and a second-stage pressure reduction chamber (1-4), the first-stage pressure reduction chamber (1-2) is internally provided with a first-stage pressure reduction valve assembly, the second-stage pressure reduction chamber (1-4) is internally provided with a second-stage pressure reduction valve assembly, and the first-stage pressure reduction valve assembly and the second-stage pressure reduction valve assembly are both automatically controlled in pressure output by negative feedback according to a set pressure reduction target pressure and form two-stage negative feedback pressure reduction output.

2. The two-stage oxygen-reducing pressure valve with negative feedback pressure control according to claim 1, characterized in that: The first-stage pressure reduction 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 reduction 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 reduction chamber (1-2), a first-stage valve sleeve throttling hole (2-1) is formed on the first-stage valve sleeve (2), and the first-stage valve sleeve throttling hole (2-1) is in communication with the outlet of the air inlet channel (1-1); the first-stage valve core (3) is sleeved in 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 abutted against the stepped surface of the inner wall of the first-stage valve sleeve (2), and the upper end of the first-stage spring (4) is abutted against the stepped surface of the outer wall of the first-stage valve core (3); a first-stage valve core center hole (3-1) is formed in the center of the first-stage valve core (3), a first-stage valve core throttling hole (3-2) is formed on the side wall of the first-stage valve core (3), and the first-stage valve core throttling hole (3-2) is adjusted in opening and closing degree with the first-stage valve sleeve throttling hole (2-1) by moving up and down; a first-stage valve core lower air pressure chamber (1-2-2) is formed between the lower end surface of the first-stage valve core (3) and the bottom surface of the first-stage pressure reduction chamber (1-2), and a first-stage valve core upper air pressure chamber (1-2-1) is formed between the upper end surface of the first-stage valve core (3) and the top surface of the first-stage pressure reduction chamber (1-2).

3. The two-stage oxygen delivery pressure reducing valve with negative feedback pressure control 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 gland (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), and the secondary valve sleeve throttling hole (13-1) is in communication with the outlet of the first-stage pressure reducing gas passage (1-3); the secondary valve core (14) is sleeved in 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 arranged in the center of the secondary valve core (14), a secondary valve core throttling hole (14-2) is arranged on the side wall of the secondary valve core (14), and the secondary valve core throttling hole (14-2) is adjusted in opening and closing degree with the secondary valve sleeve throttling hole (13-1) by moving axially and leftward and rightward; the gland (16) is fixed on the port of the secondary pressure reducing chamber (1-4), the secondary spring (15) is arranged in the gland (16), one end of the secondary spring (15) is abutted against a spring seat in the gland (16), and the other end of the secondary spring (15) is connected with the secondary valve core (14) through the spring seat; a secondary valve core left gas pressure chamber (1-4-1) is formed between the left end surface of the secondary valve core (14) and the left end bottom surface of the secondary pressure reducing chamber (1-4), a secondary valve core right gas pressure chamber (1-4-2) is formed between the middle stepped surface of the outer wall of the secondary valve core (14) and the middle stepped surface of the inner wall of the secondary valve sleeve (13), and the right gas pressure chamber (1-4-2) is in communication with the secondary valve core center hole (14-1) through a side gas hole.

4. The two-stage oxygen delivery pressure reducing valve with negative feedback pressure control according to claim 3, characterized in that: The first-stage spring (4) and the secondary spring (15) are selected according to the set pressure reducing target pressure.

5. The two-stage oxygen delivery pressure reducing valve with negative feedback pressure control of claim 1, wherein: A cover plate (17) is arranged at the bottom of the oxygen supply chamber (1-6), a fixed seat II (23) is arranged in the oxygen supply chamber (1-6), an air passing gap (1-7) is formed between the lower surface of the fixed seat II (23) and the cover plate (17), and the outlet of the secondary pressure reducing chamber (1-4) is in communication with the air passing gap (1-7) through a secondary pressure reducing gas passage (1-5); an air outlet passage (1-8) is arranged on the side wall of the valve body (1), an air outlet valve piece (6) is fixed on the fixed seat II (23) through a pressing cap (7), the air outlet valve piece (6) is in communication with the air outlet passage (1-8) through a gas passage arranged on the fixed seat II (23), and an air outlet nozzle (8) is arranged on the air outlet passage (1-8).

6. The two-stage oxygen delivery pressure reducing valve with negative feedback pressure control of claim 5, wherein: A pearl hitting device (19) is arranged on the upper portion of the fixed seat II (23), the upper opening of the oxygen supply chamber (1-6) is covered by a fixed seat I (18), an indicating plate (20) is arranged on the upper portion of the fixed seat I (18), a mode selection handle (21) is arranged on the upper portion of the indicating plate (20), and a state prompter (22) is arranged on the mode selection handle (21).

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

8. The two-stage pressure reducing valve with negative feedback pressure control for oxygen supply according to claim 1, characterized in that: One side of the valve body (1) is provided with a pressure gauge (24), and the pressure gauge (24) is communicated with the air inlet channel (1-1) through an air passage.

9. The two-stage pressure reducing valve with negative feedback pressure control for oxygen supply according to claim 1, characterized in that: A relief hole (25) is arranged on the side wall of the valve body (1), the relief hole (25) is communicated with the air inlet channel (1-1), a safety valve (26) is arranged on the relief hole (25), and a filter screen (10) is arranged on the air inlet channel (1-1).

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