Portable anti-leakage oxygen supply device and oxygen supply control method

Abstract

The present invention belongs to the technical field of medical oxygen supply equipment, and specifically relates to a portable anti-leakage oxygen supply device and an oxygen supply control method, including a shell, a liquid storage tank, a liquid phase pipe, a gas phase pipe, a first gasification coil and a second gasification coil; a vacuum interlayer is formed between the liquid storage tank and the inner wall of the shell; the first end of the liquid phase pipe extends to the bottom of the liquid storage tank, and the second end is connected to the first end of the first gasification coil; the first end of the gas phase pipe extends to the top of the liquid storage tank, and the second end is connected to the first end of the second gasification coil; the oxygen supply device is also provided with a flow regulating valve and a control valve assembly; the pressure regulating valve and the flow regulating valve cooperate with each other, so that the liquid oxygen vaporization speed can be automatically adjusted according to the use requirements, thereby controlling the oxygen supply flow; the pressure regulating valve and the second gasification coil cooperate with each other to prevent the leakage of liquid oxygen when the oxygen supply device is inverted. The present invention aims to solve the problem of liquid oxygen leakage in existing portable liquid oxygen supply equipment.

Description

Technical Field

[0001] The present invention belongs to the technical field of medical oxygen supply equipment, and in particular relates to a portable leak-proof oxygen supply device and an oxygen supply control method. Background Art

[0002] With the increase of medical care, outdoor extreme sports and plateau outdoor work, portable oxygen supply equipment is increasingly recognized by people. Among the many different types of portable oxygen supply equipment, the equipment that uses liquid oxygen (also called liquid oxygen) to store and gasify it to supply oxygen to the user has the advantages of simple structure, large oxygen storage capacity, long oxygen supply time, small size and easy to carry, so it is widely used.

[0003] However, due to its small size, this portable liquid oxygen supply equipment often tilts or even inverts during use, or the liquid oxygen continues to vaporize in the storage tank, causing the internal pressure to exceed the limit; in the above case, the liquid oxygen stored in the storage tank of the oxygen supply equipment will leak to the outside through the gas phase pipeline or the liquid phase pipeline under the action of internal pressure. A large amount of liquid oxygen leakage makes it impossible for the liquid oxygen to be heated up and vaporized into oxygen. The temperature of liquid oxygen is extremely low (below -183°C). Once a leak occurs, on the one hand, it will cause damage to the control valve body in the equipment and loss of oxygen; on the other hand, if it occurs in the process of supplying oxygen to the user, liquid oxygen will splash directly from the oxygen supply valve to the human body, causing severe frostbite.

[0004] Based on the above, there is an urgent need to provide a device that can solve the liquid oxygen leakage problem of existing portable liquid oxygen supply equipment while meeting the needs of being compact and portable and providing high-quality oxygen supply. Summary of the invention

[0005] The present invention provides a portable anti-leakage oxygen supply device, which has a shell, a liquid storage tank, a liquid phase pipe, a gas phase pipe, a first gasification coil, a second gasification coil, a flow regulating valve and a control valve assembly, which can meet the requirements of being compact and portable and solve the liquid oxygen leakage problem existing in existing portable liquid oxygen supply equipment under the premise of providing high-quality oxygen supply. The specific contents are as follows:

[0006] A portable anti-leakage oxygen supply device comprises a shell, a liquid storage tank, a liquid phase pipe, a gas phase pipe, a first gasification coil, a second gasification coil, a flow regulating valve and a control valve assembly;

[0007] The liquid storage tank has a cavity for accommodating liquid oxygen and is mounted inside the shell, with a vacuum interlayer formed between its outer wall and the inner wall of the shell;

[0008] The liquid phase pipe has a first end which passes through the shell and the liquid storage tank in sequence from top to bottom and extends to the bottom of the liquid storage tank, and a second end which is connected to the first end of the first vaporization coil installed at the upper end of the shell;

[0009] The gas phase pipe has a first end which passes through the shell and the liquid storage tank in sequence from top to bottom and extends to the top of the liquid storage tank, and a second end which is connected to the first end of the second gasification coil installed at the upper end of the shell;

[0010] The second gasification coil is coiled and sleeved on the outer end surface of the first gasification coil;

[0011] The control valve assembly is arranged at the upper end of the shell, and includes a control valve body, a pressure regulating valve, a first air inlet and a first air outlet; the first air inlet is arranged at one end of the control valve body and connected to the second end of the second gasification coil; the first air outlet is arranged at the other end of the control valve body and connected to the flow regulating valve through a pipeline; the pressure regulating valve is arranged at the upper end of the control valve body and is communicated with the first air inlet and the first air outlet respectively;

[0012] The flow regulating valve is arranged at the upper end of the shell, and has a second air inlet and a second air outlet, wherein the second air inlet is connected to the second end of the first gasification coil, and the second air outlet is connected to an external breathing mask;

[0013] The pressure regulating valve cooperates with the flow regulating valve to adjust the oxygen supply flow; the pressure regulating valve cooperates with the second gasification coil to prevent leakage of liquid oxygen when the oxygen supply device is in an inverted state.

[0014] Further, the control valve assembly also includes a pressure relief valve;

[0015] The pressure relief valve is arranged at the upper end of the control valve body, and is connected to the first air inlet and the outside atmosphere respectively, so as to limit the pressure difference between the first air inlet and the outside atmosphere.

[0016] Furthermore, the control valve body is internally provided with a first air passage connecting the first air inlet, the pressure relief valve and the pressure regulating valve, a second air passage connecting the pressure regulating valve and the first air outlet, and a third air passage connecting the pressure relief valve and the outside atmosphere.

[0017] Furthermore, the liquid phase tube is nested inside the gas phase tube, and a gap is formed between the outer wall of the liquid phase tube and the inner wall of the gas phase tube.

[0018] Furthermore, the flow regulating valve also includes a regulating valve body and a flow regulating mechanism;

[0019] The flow regulating mechanism is adjustably installed in the regulating valve body and can adjust the opening of the channel between the second air inlet and the second air outlet.

[0020] Furthermore, the oxygen supply device further comprises an exhaust valve arranged at the upper end of the shell;

[0021] The exhaust valve comprises an exhaust valve body, a third air inlet, a third air outlet, an exhaust port and a valve stem;

[0022] The second end of the gas phase pipe is connected to the third gas inlet;

[0023] The first end of the second gasification coil is connected to the third gas outlet, and the third gas inlet, the third gas outlet and the gas outlet are interconnected inside the exhaust valve body;

[0024] The second end of the liquid phase pipe is connected to the first end of the first gasification coil after passing through the exhaust valve body via the third gas inlet;

[0025] The valve stem is adjustably installed inside the exhaust valve body, and is used to connect or block the passage between the exhaust port and the third air inlet and the third air outlet.

[0026] Furthermore, the oxygen supply device also includes a filling interface and a filling conduit;

[0027] The filling interface is arranged at the bottom end of the shell, passes through the shell and the liquid storage tank from bottom to top and extends to the inside of the liquid storage tank;

[0028] The filling conduit is arranged inside the liquid storage tank, with a first end connected to the upper end of the filling interface and a second end extending to the upper end inside the liquid storage tank.

[0029] Furthermore, the oxygen supply device also includes a filtering tee;

[0030] The filtering tee comprises a fourth air inlet, a fifth air inlet and a fourth air outlet which are interconnected, and a filter screen installed inside the fourth air inlet and the fourth air outlet;

[0031] The fourth air inlet is connected to the second end of the first gasification coil;

[0032] The fifth air inlet is connected to the first air outlet through a first pipeline;

[0033] The fourth air outlet is connected to the second air inlet through a second pipeline;

[0034] The filter screen is used to oxygenate the mist liquid;

[0035] The liquid oxygen layer inside the liquid storage tank, the liquid phase pipe, the first gasification coil, the filtering tee, the first pipeline, the first gas outlet and the second gas channel form a first pressure passage;

[0036] The oxygen layer inside the liquid storage tank, the gas phase pipe, the second gasification coil, the first air inlet and the first air channel form a second pressure passage.

[0037] An oxygen supply control method, the method comprising:

[0038] S1. respectively set the opening thresholds of the pressure regulating valve and the pressure relief valve, and keep the opening threshold of the pressure relief valve greater than the opening threshold of the pressure regulating valve;

[0039] S2, adjusting the flow regulating mechanism to keep the flow regulating valve in a state of closing the oxygen supply; adjusting the valve stem to keep the third air inlet and the exhaust port in a connected state;

[0040] S3, connecting the external liquid oxygen storage tank to the filling interface to fill the liquid oxygen;

[0041] S4. When liquid oxygen is ejected from the exhaust port, disconnect the liquid oxygen storage tank from the filling interface, adjust the valve stem, and use the valve stem to close the passage between the third air inlet and the exhaust port to complete the filling of liquid oxygen;

[0042] S5, the liquid oxygen filled into the liquid storage tank is vaporized in real time to generate oxygen, and the generated oxygen is directed to the pressure regulating valve by using the second pressure passage; the liquid oxygen in the liquid storage tank is directed to the first vaporizing coil by using the liquid phase pipe, and the liquid oxygen is vaporized by using the first vaporizing coil to obtain vaporized oxygen; the oxygen is reversely directed to the liquid storage tank by using the first vaporizing coil and the liquid phase pipe, and the pressure value in the second pressure passage increases;

[0043] S6, when the pressure in the second pressure passage is less than or equal to the opening threshold of the pressure regulating valve, the second air inlet and the second air outlet are disconnected, and the oxygen supply device is not inverted, executing S7;

[0044] When the pressure in the second pressure passage is greater than the opening threshold of the pressure regulating valve, the second air inlet and the second air outlet are disconnected, and the oxygen supply device is not inverted, executing S8;

[0045] When the pressure in the isobaric circuit is greater than the opening threshold of the pressure relief valve, the second air inlet and the second air outlet are disconnected, and the oxygen supply device is not inverted, executing S9;

[0046] When the pressure of the isobaric circuit is less than or equal to the opening threshold of the pressure relief valve, the second air inlet and the second air outlet are disconnected, and the oxygen supply device is not inverted, executing S10;

[0047] When the flow regulating mechanism is adjusted to connect the second air inlet and the second air outlet, executing S11;

[0048] When the oxygen supply device is inverted, executing S12;

[0049] S7, the pressure regulating valve remains closed, and the process returns to S6;

[0050] S8, the pressure regulating valve is opened; the first pressure passage is connected with the second pressure passage to form an isobaric circuit, and the process returns to S6;

[0051] S9, the pressure relief valve is opened to connect the isobaric circuit with the outside atmosphere, and the process returns to S6;

[0052] S10, the pressure relief valve is closed to disconnect the third airway from the isobaric circuit, and the process returns to S6;

[0053] S11, the oxygen supply device implements oxygen supply;

[0054] S12. Preventing liquid oxygen leakage by using the control valve assembly and the second vaporization coil.

[0055] Furthermore, the oxygen supply device implements oxygen supply, including:

[0056] S111, the oxygen gasified in the liquid storage tank is guided to the external breathing mask for oxygen supply through the second pressure passage, the pressure regulating valve, the first pipeline, the filtering tee, the second pipeline and the flow regulating valve under the action of the pressure difference between the isobaric circuit and the outside, and the pressure of the isobaric circuit is reduced;

[0057] S112, when the pressure of the isobaric circuit is less than or equal to the opening threshold of the pressure regulating valve, the pressure regulating valve is closed; the liquid oxygen in the liquid storage tank is pressed into the liquid phase pipe and the first vaporizing coil for vaporization to generate oxygen by utilizing the pressure difference between the first pressure passage and the second pressure passage, and the oxygen is directed to the external breathing mask for oxygen supply by utilizing the first pressure passage, the filtering tee, the second pipeline and the flow regulating valve;

[0058] S113, when the flow regulating mechanism is adjusted to increase the opening of the channel between the second air inlet and the second air outlet, executing S114;

[0059] When the flow regulating mechanism is adjusted to reduce the opening of the channel between the second air inlet and the second air outlet, S115 is executed;

[0060] When the flow regulating mechanism is adjusted to disconnect the second air inlet and the second air outlet, return to S6;

[0061] S114, the pressure difference between the first pressure passage and the second pressure passage is increased, and the pressure difference is used to pressurize more liquid oxygen into the liquid phase pipe and the first vaporization coil to accelerate vaporization and produce more oxygen, so as to obtain more oxygen supply flow, and return to S112;

[0062] S115, the pressures of the first pressure passage and the second pressure passage are both increased; and the pressure difference between the first pressure passage and the second pressure passage is reduced; the liquid oxygen in the liquid storage tank is reduced to be pressed into the first vaporizing coil for vaporization, so as to slow down the oxygen supply;

[0063] S116. When the pressure of the second pressure passage is greater than the opening threshold of the pressure regulating valve, the pressure regulating valve is opened, the first pressure passage and the second pressure passage are connected to form the isobaric circuit, and the process returns to S111.

[0064] Further, the method of preventing liquid oxygen leakage by using the control valve assembly and the second vaporizing coil comprises:

[0065] S121, when the flow regulating valve is in an open state and the pressure regulating valve is in an open state, execute S122;

[0066] When the flow regulating valve is in an open state and the pressure regulating valve is in a closed state, executing S123;

[0067] When the flow regulating valve is in a closed state and the pressure regulating valve is in an open state, executing S124;

[0068] When the pressure in the isobaric circuit gradually increases to a value greater than the pressure relief valve opening threshold, executing S125;

[0069] When the pressure in the isobaric circuit gradually decreases to a value less than or equal to the opening threshold of the pressure relief valve, executing S126;

[0070] When the oxygen supply device returns to normal, return to step S6;

[0071] S122, the first pressure passage is connected to the second pressure passage to form the isobaric circuit; the oxygen in the inverted liquid storage tank is diverted to the external breathing mask for oxygen supply by using the liquid phase pipe, the first gasification coil, the filter tee, the second pipeline and the flow regulating valve; the liquid oxygen in the inverted liquid storage tank is gasified by the gas phase pipe through the second gasification coil to form oxygen, and this part of oxygen is diverted to the external breathing mask for oxygen supply by using the pressure regulating valve, the first pipeline, the filter tee, the second pipeline and the flow regulating valve, and then returns to S121;

[0072] S123, the first pressure passage is disconnected from the second pressure passage; the oxygen in the inverted liquid storage tank is diverted to the external breathing mask for oxygen supply by using the liquid phase pipe, the first gasification coil, the filter tee, the second pipeline and the flow regulating valve; the liquid oxygen in the inverted liquid storage tank is gasified by the second gasification coil through the gas phase pipe to form oxygen, and this part of oxygen is then returned to the liquid storage tank through the second gasification coil and the gas phase pipe, and returns to S121;

[0073] S124, the first pressure passage is connected to the second pressure passage to form the isobaric circuit; the liquid oxygen in the liquid storage tank enters the second vaporizing coil through the gas phase pipe under the action of gravity to be vaporized, and returns to S121;

[0074] S125, the pressure relief valve is opened, and the isobaric circuit is connected to the third airway by opening the pressure relief valve, and oxygen is discharged to the outside for pressure relief, and the process returns to S121;

[0075] S126, the pressure relief valve is closed, the isobaric circuit and the third air channel are disconnected, and the process returns to S121.

[0076] The beneficial effects of the present invention are:

[0077] 1. The double-layer structure with a vacuum interlayer between the shell and the liquid storage tank can reduce the heat exchange between liquid oxygen and the outside world while strengthening the strength, thereby reducing the gasification rate of liquid oxygen and preventing the danger of excessive internal pressure caused by excessive gasification, resulting in liquid oxygen leakage or even tank rupture;

[0078] 2. The oxygen supply device is provided with a first vaporizing coil and a second vaporizing coil, so that the liquid oxygen layer and the oxygen layer in the liquid storage tank can be supplied with oxygen separately under different conditions; and in the event that the liquid storage tank is inverted, the second vaporizing coil can cooperate with the pressure regulating valve to prevent leakage of liquid oxygen;

[0079] 3. A control valve assembly is provided in the oxygen supply device, wherein the pressure regulating valve can cooperate with the flow regulating valve to realize on-demand adjustment of the oxygen supply flow, that is, the gasification speed of liquid oxygen can be automatically controlled according to the size of the opening of the flow regulating valve; thereby providing an oxygen flow that meets the oxygen supply demand;

[0080] 4. The second gasification coil is coiled and sleeved on the outer end surface of the first gasification coil, and the first gasification coil, the second gasification coil, the flow regulating valve and the control valve assembly are all arranged on the upper end of the shell; so that the overall structure of the oxygen supply device is compact, the space utilization rate is high, and the portability requirement of the oxygen supply device can be met;

[0081] 5. Through structural optimization, the external volume of the oxygen supply device can be reduced to 2L; the liquid oxygen volume reaches 600ml; compared with the existing technology, the liquid oxygen volume and oxygen supply can be increased by 60% while the overall volume is reduced by 30%. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained based on these drawings without creative work.

[0083] Figure 1 This is a schematic diagram of the structural principle of a portable leak-proof oxygen supply device;

[0084] Figure 2 This is a front view of the external structure of the portable leak-proof oxygen supply device;

[0085] Figure 3 The front view, left view and top view of the external structure of the portable leak-proof oxygen supply device after removing the upper cover;

[0086] Figure 4 A perspective view of the internal structure of a control valve assembly of a portable leak-proof oxygen supply device;

[0087] Figure 5 A cross-sectional view of the filter tee of a portable leak-proof oxygen supply device;

[0088] In the figure: 1. Shell; 2. Liquid storage tank; 3. Liquid phase pipe; 4. Gas phase pipe; 5. First gasification coil; 6. Second gasification coil; 7. Flow control valve; 701. Second air inlet; 702. Second air outlet; 703. Regulating valve body; 704. Flow control mechanism; 8. Control valve assembly; 801. Control valve body; 802. Pressure regulating valve; 803. First air inlet; 804. First air outlet; 805. Pressure relief valve; 806. First air duct; 807. First Second air channel; 808. Third air channel; 9. Drain valve; 901. Drain valve body; 902. Third air inlet; 903. Third air outlet; 904. Air outlet; 905. Valve stem; 10. Filling interface; 11. Filling conduit; 12. Filter tee; 121. Fourth air inlet; 122. Fifth air inlet; 123. Fourth air outlet; 124. Filter screen; 13. First pipeline; 14. Second pipeline; 15. Liquid oxygen layer; 16. Oxygen layer; 17. Upper cover. DETAILED DESCRIPTION

[0089] 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.

[0090] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0091] It should be noted that when an element is referred to as being "fixed to", "placed on", "disposed with", "provided with", "set to", "arranged to" or "connected to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0092] It should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0093] Please refer to Figure 1 to Figure 5 A portable leak-proof oxygen supply device is shown, comprising a housing 1, a liquid storage tank 2, a liquid phase pipe 3, a gas phase pipe 4, a first gasification coil 5, a second gasification coil 6, a flow regulating valve 7 and a control valve assembly 8;

[0094] like Figure 1 As shown, the liquid storage tank 2 has a cavity for accommodating liquid oxygen and is mounted inside the shell 1, with a vacuum interlayer formed between its outer wall and the inner wall of the shell 1;

[0095] The first end of the liquid phase pipe 3 passes through the shell 1 and the liquid storage tank 2 in sequence from top to bottom and extends to the bottom of the liquid storage tank 2, and the second end is connected to the first end of the first gasification coil 5 installed on the upper end of the shell 1;

[0096] The gas phase pipe 4 has a first end that passes through the shell 1 and the liquid storage tank 2 in sequence from top to bottom and extends to the top of the liquid storage tank 2, and a second end that is connected to a first end of the second gasification coil 6 installed at the upper end of the shell 1;

[0097] The second gasification coil 6 is coiled and sleeved on the outer end surface of the first gasification coil 5;

[0098] The control valve assembly 8 is arranged at the upper end of the shell 1, and includes a control valve body 801, a pressure regulating valve 802, a first air inlet 803 and a first air outlet 804; the first air inlet 803 is arranged at one end of the control valve body 801, and is connected to the second end of the second gasification coil 6; the first air outlet 804 is arranged at the other end of the control valve body 801, and is connected to the flow regulating valve 7 through a pipeline; the pressure regulating valve 802 is arranged at the upper end of the control valve body 801, and is communicated with the first air inlet 803 and the first air outlet 804 respectively;

[0099] The flow regulating valve 7 is arranged at the upper end of the housing 1, and has a second air inlet 701 and a second air outlet 702. The second air inlet 701 is connected to the second end of the first gasification coil 5, and the second air outlet 702 is connected to an external breathing mask;

[0100] The pressure regulating valve 802 cooperates with the flow regulating valve 7 to adjust the oxygen supply flow; the pressure regulating valve 802 cooperates with the second gasification coil 6 to prevent leakage of liquid oxygen when the oxygen supply device is in an inverted state.

[0101] It should be noted that the shell 1 is mounted on the outside of the liquid storage tank 2, and the two are supported by a number of aerogel pads to prevent mutual collision and damage; after the liquid storage tank 2 is installed in the shell 1, the top of the shell 1 is welded and packaged to form a closed interlayer, and then vacuumed; the shell 1 and the liquid storage tank 2 are preferably made of austenitic stainless steel.

[0102] Need to explain yes, if Figure 2 As shown, the upper end of the housing 1 also has an upper cover 17, and the components at the upper end of the housing 1 can be buckled and installed in the upper cover 17 to play a protective role.

[0103] It should be noted that the liquid phase pipe 3 and the gas phase pipe 4 are preferably made of aluminum alloy pipes, and the holes of the gas phase pipe 4 passing through the liquid storage tank 2 and the shell 1 must be welded and sealed.

[0104] It should be noted that the first vaporization coil 5 and the second vaporization coil are preferably made of aluminum alloy tubes. The tube diameter of the first vaporization coil 5 is preferably 4 mm, and the tube diameter of the second vaporization coil 6 is preferably 3 mm. The vaporization effect of the first vaporization coil 5 is stronger than that of the second vaporization coil 6. Their function is to extend the heat exchange time with the outside when the liquid oxygen passes through a longer pipeline with better thermal conductivity, and absorb a large amount of heat to accelerate the vaporization of the liquid oxygen.

[0105] In a specific implementation, a double-layer structure with a vacuum interlayer between the shell 1 and the liquid storage tank 2 is adopted, which can reduce the heat exchange between the liquid oxygen and the outside world while strengthening the strength, thereby reducing the vaporization speed of the liquid oxygen, preventing the danger of excessive internal pressure caused by excessive vaporization, resulting in liquid oxygen leakage or even tank rupture;

[0106] The oxygen supply device is provided with a first vaporizing coil 5 and a second vaporizing coil 6, so that the liquid oxygen layer 15 and the oxygen layer 16 in the liquid storage tank 2 can be supplied with oxygen separately under different conditions; and when the liquid storage tank 2 is inverted, the second vaporizing coil 6 can cooperate with the pressure regulating valve 802 to prevent leakage of liquid oxygen;

[0107] The oxygen supply device is provided with a control valve assembly 8, wherein the pressure regulating valve 802 can cooperate with the flow regulating valve 7 to realize the on-demand regulation of the oxygen supply flow, that is, the gasification speed of the liquid oxygen can be automatically controlled according to the size of the opening of the flow regulating valve 7; thereby providing an oxygen flow that meets the oxygen supply demand;

[0108] The second gasification coil 6 is coiled and sleeved on the outer end surface of the first gasification coil 5, and the first gasification coil 5, the second gasification coil 6, the flow regulating valve 7 and the control valve assembly 8 are all arranged at the upper end of the shell 1; so that the overall structure of the oxygen supply device is compact and the space utilization rate is high, and the portability requirement of the oxygen supply device can be met;

[0109] like Figure 3 As shown, through structural optimization, the external volume of the oxygen supply device can be reduced to 2L; the liquid oxygen volume reaches 600ml; compared with the existing technology, the liquid oxygen volume and oxygen supply can be increased by 60% while the overall volume is reduced by 30%.

[0110] In the embodiment provided by the present invention, the control valve assembly 8 further includes a pressure relief valve 805;

[0111] The pressure relief valve 805 is disposed at the upper end of the control valve body 801 and is connected to the first air inlet 803 and the outside atmosphere respectively, and is used to limit the pressure difference between the first air inlet 803 and the outside atmosphere;

[0112] In addition, the control valve body 801 is internally provided with a first air passage 806 that can connect the first air inlet 803, the pressure relief valve 805 and the pressure regulating valve 802, a second air passage 807 that can connect the pressure regulating valve 802 and the first air outlet 804, and a third air passage 808 that can connect the pressure relief valve 805 and the outside atmosphere.

[0113] It should be noted that if Figure 4As shown, a pressure regulating valve 802 and a pressure relief valve 805 are installed in the control valve assembly 8. The two valves are arranged side by side at the upper end of the control valve assembly 8 and have the same internal structure. Both are preferably the same structure as the existing pressure control valve, with original parts such as elastic components and valve plates. It is a common structure for technical personnel in this field and is not limited here.

[0114] It should be noted that both the pressure regulating valve 802 and the pressure relief valve 805 are provided with opening thresholds, and both thresholds are adjustable. The preload force of the elastic component can be increased or decreased by the adjusting knob provided at the upper end of the elastic component, thereby achieving adjustment of the opening threshold; the opening threshold of the pressure regulating valve 802 can be set to 50-100 kPa, preferably 80 kPa here, and the opening threshold of the pressure relief valve 805 can be set to 110-180 kPa, preferably 150 kPa here.

[0115] It should be noted that when the pressure in the first air inlet 803 and the first air duct 806 is greater than 80 kPa, the pressure regulating valve 802 is opened, and the first air inlet 803 and the first air duct 806 are connected to the second air duct 807 and the first air outlet 804; when the pressure in the first air inlet 803 and the first air duct 806 is ≤80 kPa, the pressure regulating valve 802 is closed, and the first air inlet 803 and the first air duct 806 are disconnected from the second air duct 807 and the first air outlet 804; when the pressure in the first air inlet 803 and the first air duct 806 is greater than 150 kPa, the pressure relief valve 805 is opened, and the first air inlet 803 and the first air duct 806 are connected to the third air duct 808 and the outside atmosphere for pressure relief.

[0116] In a specific implementation, the pressure regulating valve 802 can cooperate with the second vaporizing coil 6. When the oxygen supply device is inverted or tilted at a large angle (because the overall volume is small, it is easy for the device to be inverted or tilted during carrying and use), it can prevent liquid oxygen from leaking from the pressure relief valve 805 or from the external breathing mask through the flow regulating valve 7; since liquid oxygen has an extremely low temperature (-183°C), once liquid oxygen leaks, the rubber valve sheet in the pressure relief valve 805 will be frozen and damaged at best, and it will be sprayed out from the breathing mask and freeze the user at worst; therefore, in order to prevent the leakage of liquid oxygen, the present invention proposes to use the pressure regulating valve 802 to limit the amount of liquid oxygen entering the second vaporizing coil 6, so that the liquid oxygen flowing into the second vaporizing coil 6 is fully vaporized and heated before oxygen supply is implemented (the specific method is described below).

[0117] The pressure regulating valve 802 can cooperate with the flow regulating valve 7 to automatically adjust the oxygen supply according to the user's oxygen demand (the specific method is described below).

[0118] In one embodiment, if Figure 1As shown, the liquid phase tube 3 is nested inside the gas phase tube 4 , and a gap is formed between the outer wall of the liquid phase tube 3 and the inner wall of the gas phase tube 4 .

[0119] It should be noted that a nested structure is adopted between the gas phase tube 4 and the liquid phase tube 3, that is, the inner diameter of the gas phase tube 4 is larger than the diameter of the outer wall of the liquid phase tube 3; the inner tube wall of the liquid phase tube 3 forms a liquid oxygen outlet channel, and the gap between the outer tube wall of the liquid phase tube 3 and the inner tube wall of the gas phase tube 4 forms an oxygen outlet channel, and the gap can be 0.3 to 1 mm, preferably 0.5 mm here; the gas phase tube 4 passes through the holes of the shell 1 and the liquid storage tank 2 from top to bottom, and is preferably sealed by welding.

[0120] In specific implementation, this structural design reduces the number of opening welding points between the shell 1 and the liquid storage tank 2, reduces leakage points, and improves the reliability of the device; the liquid phase tube 3 is nested in the gas phase tube 4, which reduces the number of heat conduction channels in the vacuum layer between the shell 1 and the liquid storage tank 2, and effectively reduces the vaporization rate of liquid oxygen in the liquid storage tank 2.

[0121] In the embodiment provided by the present invention, Figure 1 As shown, the flow regulating valve 7 further includes a regulating valve body 703 and a flow regulating mechanism 704;

[0122] The flow regulating mechanism 704 is adjustably installed in the regulating valve body 703 , and can adjust the opening of the channel between the second air inlet 701 and the second air outlet 702 .

[0123] It should be noted that the flow regulating mechanism 704 preferably adopts a threaded adjustment mechanism and is equipped with a rotating handle, which can be manually rotated to adjust the flow rate, and the handle is preferably arranged on the outside of the upper cover 17 to facilitate the user to easily adjust it; other existing similar adjustment mechanisms can also be used, as long as it can adjust the opening of the channel between the second air inlet 701 and the second air outlet 702, and there is no limitation here.

[0124] In a specific implementation, the flow regulating valve 7 is provided with a flow regulating mechanism 704, which can conveniently allow a user to manually adjust the opening of the channel between the second air inlet 701 and the second air outlet 702, so as to obtain different oxygen supply flow rates.

[0125] In one embodiment, if Figure 1 As shown, the oxygen supply device further includes an exhaust valve 9 arranged at the upper end of the housing 1;

[0126] The exhaust valve 9 includes an exhaust valve body 901, a third air inlet 902, a third air outlet 903, an exhaust port 904 and a valve stem 905;

[0127] The second end of the gas phase pipe 4 is connected to the third gas inlet 902;

[0128] The first end of the second gasification coil 6 is connected to the third gas outlet 903, and the third gas inlet 902, the third gas outlet 903 and the gas outlet 904 are interconnected inside the exhaust valve body 901;

[0129] The second end of the liquid phase pipe 3 passes through the third gas inlet 902 and then passes through the drain valve body 901 to be connected to the first end of the first gasification coil 5;

[0130] The valve stem 905 is adjustably installed inside the exhaust valve body 901 to connect or block the passage between the exhaust port 904 and the third air inlet 902 and the third air outlet 903 .

[0131] It should be noted that the drain valve 9 is used to discharge the gas in the upper layer of the liquid storage tank 2 to the outside when liquid oxygen is filled, so as to prevent gas blockage in the liquid storage tank 2; the valve stem 905 is preferably a threaded adjustment structure, and the passage between the exhaust port 904 and the third air inlet 902 and the third air outlet 903 can be closed or adjusted by rotating the valve stem 905; when filling liquid oxygen, it is necessary to manually rotate the valve stem 905 to open the passage, and the gas in the liquid storage tank 2 is discharged to the outside through the gas phase pipe 4 and the exhaust port 904; the valve stem 905 structure can also use other existing technical structures, as long as it can achieve closing or adjusting the passage between the exhaust port 904 and the third air inlet 902 and the third air outlet 903, and there is no limitation here.

[0132] In a specific implementation, the drain valve 9 can discharge the gas in the liquid storage tank 2 to prevent gas blockage and provide conditions for the normal operation of the oxygen supply device.

[0133] In the embodiment provided by the present invention, Figure 1 As shown, the oxygen supply device further includes a filling interface 10 and a filling conduit 11;

[0134] The filling interface 10 is arranged at the bottom end of the housing 1, and passes through the housing 1 and the liquid storage tank 2 from bottom to top and extends to the inside of the liquid storage tank 2;

[0135] The filling conduit 11 is arranged inside the liquid storage tank 2 , with a first end connected to the upper end of the filling interface 10 and a second end extending to the upper end inside the liquid storage tank 2 .

[0136] It should be noted that the filling interface 10 preferably adopts a one-way valve structure, which can only fill liquid oxygen inward, while the internal liquid oxygen cannot come out; the filling interface 10 has a special interface that cooperates with the external liquid oxygen storage and transportation tank, and the liquid oxygen storage and transportation tank can be directly connected to the special interface for liquid oxygen filling, and the connection can be disconnected after completion, and liquid oxygen leakage will not occur; and the holes through which the filling interface 10 and the shell 1 and the liquid storage tank 2 pass are preferably sealed by welding.

[0137] In a specific implementation, a filling interface 10 and a filling conduit 11 are provided, so that liquid oxygen can be filled conveniently without leakage of liquid oxygen.

[0138] In one embodiment, if Figure 1 and Figure 5 As shown, the oxygen supply device further includes a filtering tee 12;

[0139] The filtering tee 12 comprises a fourth air inlet 121, a fifth air inlet 122 and a fourth air outlet 123 which are interconnected, and a filter screen 124 installed inside the fourth air inlet 121 and the fourth air outlet 123;

[0140] The fourth air inlet 121 is connected to the second end of the first gasification coil 5;

[0141] The fifth air inlet 122 is connected to the first air outlet 804 through the first pipeline 13;

[0142] The fourth air outlet 123 is connected to the second air inlet 701 through the second pipeline 14;

[0143] The filter 124 is used to oxygenate the mist liquid;

[0144] The liquid oxygen layer 15 inside the liquid storage tank 2, the liquid phase pipe 3, the first gasification coil 5, the filtering tee 12, the first pipeline 13, the first gas outlet 804 and the second gas channel 807 form a first pressure passage;

[0145] The oxygen layer 16 inside the liquid storage tank 2, the gas phase pipe 4, the second gasification coil 6, the first air inlet 803 and the first air channel 806 form a second pressure passage.

[0146] It should be noted that if the amount of oxygen used is large, a large amount of liquid oxygen will enter the first vaporization coil 5, forming a small amount of misty liquid oxygen, which needs to be vaporized again through the filter 124 to form oxygen.

[0147] In a specific implementation, the filtering tee 12 can connect the first pressure passage and the second pressure passage to the flow regulating valve 7 at the same time, providing conditions for oxygen supply; the filter screen 124 can further vaporize the unvaporized mist liquid oxygen to prevent liquid oxygen from hurting people.

[0148] An oxygen supply control method, the method comprising:

[0149] S1. respectively set the opening thresholds of the pressure regulating valve 802 and the pressure relief valve 805, and keep the opening threshold of the pressure relief valve 805 greater than the opening threshold of the pressure regulating valve 802;

[0150] It should be noted that the opening thresholds of the pressure regulating valve 802 and the pressure relief valve 805 are preferably 80 kPa and 150 kPa, respectively.

[0151] S2, adjusting the flow regulating mechanism 704 to keep the flow regulating valve 7 in a state of closing the oxygen supply; adjusting the valve stem 905 to keep the third air inlet 902 and the exhaust port 904 in a connected state; that is, keeping the exhaust valve 9 in an open state;

[0152] S3, connecting the external liquid oxygen storage tank to the filling interface 10 to fill the liquid oxygen;

[0153] It should be noted that, under the pressure of the liquid oxygen storage tank, the liquid oxygen enters the liquid storage tank 2 along the filling conduit 11; the air inside the liquid storage tank 2 and the oxygen formed after the liquid oxygen is vaporized are discharged to the outside through the gas phase pipe 4 and the exhaust port 904 of the exhaust valve 9 under the pressure;

[0154] It should be noted that liquid oxygen will be vaporized to generate oxygen at a temperature greater than -183°C; therefore, during the filling process, vaporization will occur when the liquid oxygen enters the liquid storage tank 2.

[0155] S4. When liquid oxygen is ejected from the exhaust port 904, disconnect the liquid oxygen storage tank from the filling interface 10, adjust the valve stem 905, and use the valve stem 905 to close the passage between the third air inlet 902 and the exhaust port 904, thereby completing the filling of liquid oxygen;

[0156] It should be noted that when the liquid oxygen in the liquid storage tank 2 is full, liquid oxygen will be ejected from the exhaust port 904. After the liquid oxygen is full, it will be discharged to the outside from the gas phase pipe 4 through the exhaust valve 9. Therefore, once the phenomenon of ejecting liquid oxygen occurs, it means that the liquid oxygen is full.

[0157] S5, the liquid oxygen filled into the liquid storage tank 2 is gasified in real time to generate oxygen, and the generated oxygen is directed to the pressure regulating valve 802 by using the second pressure passage; the liquid oxygen in the liquid storage tank 2 is directed to the first gasification coil 5 by using the liquid phase pipe 3, and the first gasification coil 5 is used to gasify this part of liquid oxygen to obtain gasified oxygen; the first gasification coil 5 and the liquid phase pipe 3 are used to reversely direct this part of oxygen to the liquid storage tank 2, and the pressure value in the second pressure passage increases;

[0158] It should be noted that the liquid oxygen in the liquid storage tank 2 is gasified in real time, causing the pressure in the liquid storage tank 2 to continue to increase, and the pressurized oxygen is directed to the pressure regulating valve 802 by the second pressure passage; at the same time, under the action of pressure, the liquid oxygen is directed to the first gasification coil 5 by the liquid phase pipe 3, and the first gasification coil 5 is used to gasify this part of the liquid oxygen; the oxygen generated after gasification is reversely directed to the liquid storage tank 2 by the first gasification coil 5 and the liquid phase pipe 3, and the pressure in the liquid storage tank 2 continues to increase;

[0159] It should be noted that, at this time, since oxygen supply to the user has not started, the flow regulating valve 7 is in a closed state, so the oxygen generated by gasification in the first gasification coil 5 can only return to the liquid storage tank 2.

[0160] S6, when the pressure in the second pressure passage is less than or equal to the opening threshold of the pressure regulating valve 802, the second air inlet 701 and the second air outlet 702 are disconnected, and the oxygen supply device is not inverted, execute S7;

[0161] When the pressure in the second pressure passage is greater than the opening threshold of the pressure regulating valve 802, the second air inlet 701 and the second air outlet 702 are disconnected, and the oxygen supply device is not inverted, executing S8;

[0162] When the pressure in the isobaric circuit is greater than the opening threshold of the pressure relief valve 805, the second air inlet 701 and the second air outlet 702 are disconnected, and the oxygen supply device is not inverted, execute S9;

[0163] When the pressure of the isobaric circuit is less than or equal to the opening threshold of the pressure relief valve 805, the second air inlet 701 and the second air outlet 702 are disconnected, and the oxygen supply device is not inverted, executing S10;

[0164] When the flow regulating mechanism is adjusted to connect the second air inlet 701 and the second air outlet 702, S11 is executed;

[0165] When the oxygen supply device is inverted, executing S12;

[0166] S7, the pressure regulating valve 802 remains closed, and the process returns to S6;

[0167] It should be noted that at this time, the first pressure passage and the second pressure passage are in a disconnected state.

[0168] It should be noted that due to the continuous gasification of liquid oxygen, the pressure in the second pressure passage will increase rapidly. Within a very short period of time after the liquid oxygen is filled, it is possible that the pressure in the second pressure passage is greater than the opening threshold of the pressure regulating valve 802 and the pressure regulating valve 802 will be opened. Therefore, the pressure regulating valve 802 is usually in a normally open state when there is no oxygen supply to the user (i.e., in standby state, the same below).

[0169] S8, the pressure regulating valve 802 is opened; the first pressure passage is connected with the second pressure passage to form an isobaric circuit, and the process returns to S6;

[0170] It should be noted that, as the internal pressure of the liquid storage tank 2 continues to increase, when the pressure in the second pressure passage is greater than the opening threshold of the pressure regulating valve 802, the pressure regulating valve 802 opens; the first pressure passage is connected to the second pressure passage by opening the pressure regulating valve 802 to form an isobaric loop; in the isobaric loop, liquid oxygen will not enter the first vaporization coil 5 along the liquid phase pipe 3 to be vaporized in the absence of a pressure difference.

[0171] It should be noted that in the isobaric loop, since the pressure at each position is equal and there is no pressure difference, the liquid oxygen in the isobaric loop will not continue to be pressed into the first vaporization coil 5 for vaporization, and the liquid oxygen that previously entered the liquid phase pipe 3 will also flow back to the liquid storage tank 2 under the action of gravity; in this way, in the standby state, only a small amount of liquid oxygen will be vaporized in the liquid storage tank 2, and will not enter the first vaporization coil 5 for large-scale vaporization, thereby reducing the loss of liquid oxygen in the standby state.

[0172] S9, the pressure relief valve 805 is opened to connect the isobaric circuit with the outside atmosphere, and the process returns to S6;

[0173] It should be noted that as the liquid oxygen continues to gasify, the internal pressure of the liquid storage tank 2 continues to increase. When the pressure in the isobaric circuit is greater than the opening threshold of the pressure relief valve 805, the pressure relief valve 805 is opened; the isobaric circuit is connected to the outside atmosphere by opening the pressure relief valve 805; the oxygen in the isobaric circuit is discharged to the outside by using the third airway 808 to reduce the pressure in the isobaric circuit.

[0174] It should be noted that the opening of the pressure relief valve 805 discharges the oxygen in the isobaric circuit to the outside. This part of oxygen is a small amount of oxygen produced by the vaporization of liquid oxygen in the liquid storage tank 2, but not a large amount of oxygen produced by liquid oxygen passing through the vaporization coil, so there will be no large loss of liquid oxygen.

[0175] S10, the pressure relief valve 805 is closed to disconnect the third airway from the isobaric circuit, and the process returns to S6;

[0176] It should be noted that, by repeatedly opening and closing the pressure relief valve 805 , the pressure in the isobaric circuit can be maintained at ≤ the opening threshold of the pressure relief valve 805 .

[0177] In a specific implementation, the pressure of the isobaric circuit can be controlled by the pressure relief valve 805 to always be maintained at a level less than or equal to the opening threshold of the pressure relief valve 805, thereby protecting the entire oxygen supply device.

[0178] S11, the oxygen supply device implements oxygen supply;

[0179] S12. Prevent liquid oxygen leakage by using the control valve assembly 8 and the second vaporization coil 6.

[0180] It should be noted that, since the oxygen supply device is small in size and is usually carried around, it often tilts or inverts; once tilted or inverted, the liquid oxygen in the liquid storage tank 2 will sway or flow to the end of the liquid storage tank 2 close to the upper cover 17, and the first end of the liquid phase tube 3 is no longer connected to the liquid oxygen, but is connected to the oxygen in the liquid storage tank 2; on the other hand, the first end of the gas phase tube 4 is connected to the liquid oxygen, and the liquid oxygen flows out of the liquid storage tank 2 through the gas phase tube 4 under pressure; in the absence of corresponding structure and method, the oxygen supply device is very prone to liquid oxygen leakage.

[0181] The oxygen supply device implements oxygen supply, including:

[0182] S111, the oxygen gasified in the liquid storage tank 2 is guided to the external breathing mask for oxygen supply through the second pressure passage, the pressure regulating valve 802, the first pipeline 13, the filtering tee 12, the second pipeline 14 and the flow regulating valve 7 under the action of the pressure difference between the isobaric circuit and the outside, and the pressure of the isobaric circuit is reduced;

[0183] It should be noted that at this time, the pressure regulating valve 802 is still in the open state, and the liquid oxygen will not be pressed into the first vaporization coil 5 for vaporization. The oxygen provided to the user comes from the oxygen generated by the vaporization of the liquid oxygen in the liquid storage tank 2; since the flow regulating valve 7 is open, the isobaric circuit is connected to the outside world; and the pressure in the isobaric circuit is greater than the external atmospheric pressure. Therefore, under the action of the internal pressure, the oxygen in the liquid storage tank 2 is diverted to the external breathing mask through the second pressure passage, the pressure regulating valve 802, the first pipeline 13, the filtering tee 12, the second pipeline 14 and the flow regulating valve 7 to supply oxygen to the user.

[0184] S112, when the pressure of the isobaric circuit is less than or equal to the opening threshold of the pressure regulating valve 802, the pressure regulating valve 802 is closed; the liquid oxygen in the liquid storage tank 2 is pressed into the liquid phase pipe 3 and the first gasification coil 5 for gasification to generate oxygen by utilizing the pressure difference between the first pressure passage and the second pressure passage, and the oxygen is guided to the external breathing mask for oxygen supply by utilizing the first pressure passage, the filtering tee 12, the second pipeline 14 and the flow regulating valve 7;

[0185] It should be noted that after the pressure regulating valve 802 is closed, the second pressure passage forms a closed pipeline, so its internal pressure basically does not change and remains at ≤ the opening threshold of the pressure regulating valve 802; while the first pressure passage is still connected to the outside world, and its internal pressure is equal to the external atmospheric pressure, so there will be a pressure difference between the first pressure passage and the second pressure passage; this is reflected between the oxygen layer 16 and the liquid oxygen layer 15 inside the liquid storage tank 2, and the liquid oxygen is pressed into the liquid phase pipe 3 by the pressure of the oxygen layer 16, and then enters the first gasification coil 5 to accelerate gasification.

[0186] S113, when the flow regulating mechanism 704 is adjusted to increase the opening of the channel between the second air inlet 701 and the second air outlet 702, execute S114;

[0187] When the flow regulating mechanism 704 is adjusted to reduce the opening of the channel between the second air inlet 701 and the second air outlet 702, S115 is executed;

[0188] When the flow regulating mechanism 704 is adjusted to disconnect the second air inlet 701 and the second air outlet 702 , the process returns to S6 ;

[0189] S114, the pressure difference between the first pressure passage and the second pressure passage is increased, and the pressure difference is used to pressurize more liquid oxygen into the liquid phase pipe 3 and the first vaporization coil 5 to accelerate vaporization and produce more oxygen, so as to obtain more oxygen supply flow, and return to S112;

[0190] S115, the pressures of the first pressure passage and the second pressure passage are both increased; and the pressure difference between the first pressure passage and the second pressure passage is reduced; the liquid oxygen in the liquid storage tank 2 is reduced to be pressed into the first vaporizing coil 5 for vaporization, so as to slow down the oxygen supply;

[0191] S116. When the pressure of the second pressure passage is greater than the opening threshold of the pressure regulating valve 802, the pressure regulating valve 802 is opened, the first pressure passage is connected to the second pressure passage to form the isobaric circuit, and the process returns to S111.

[0192] In specific implementation, in this way of regulating the oxygen supply flow rate, the user only needs to adjust the flow regulating mechanism 704 of the flow regulating valve 7 to obtain the required oxygen supply flow rate, which is simple and convenient; adjusting the flow regulating mechanism 704 does not simply reduce or increase the opening of the pipeline, but as the opening decreases, the oxygen generated inside decreases accordingly, and as the opening increases, the oxygen generated inside also increases accordingly; this oxygen supply control method can prevent the oxygen supply flow rate from decreasing while the amount of oxygen generated inside the device remains unchanged, and the pressure increases and is discharged from the pressure relief valve 805, causing oxygen loss; and the oxygen supply flow rate increases while the amount of oxygen generated inside the device remains unchanged, causing the user to be unable to obtain the required amount of oxygen.

[0193] The method of preventing liquid oxygen leakage by using the control valve assembly 8 and the second vaporizing coil 6 includes:

[0194] S121, when the flow regulating valve 7 is in an open state and the pressure regulating valve 802 is in an open state, execute S122;

[0195] When the flow regulating valve 7 is in the open state and the pressure regulating valve 802 is in the closed state, execute S123;

[0196] When the flow regulating valve 7 is in the closed state and the pressure regulating valve 802 is in the open state, execute S124;

[0197] When the pressure in the isobaric circuit gradually increases to a value greater than the opening threshold of the pressure relief valve 805, S125 is executed;

[0198] When the pressure in the isobaric circuit gradually decreases to a value less than or equal to the opening threshold of the pressure relief valve 805, executing S126;

[0199] When the oxygen supply device returns to normal, return to step S6;

[0200] S122, the first pressure passage is connected to the second pressure passage to form the isobaric circuit; the oxygen in the inverted liquid storage tank 2 is diverted to the external breathing mask for oxygen supply by using the liquid phase pipe 3, the first gasification coil 5, the filter tee 12, the second pipeline 14 and the flow regulating valve 7; the liquid oxygen in the inverted liquid storage tank 2 is gasified by the gas phase pipe 4 through the second gasification coil 6 to form oxygen, and this part of oxygen is diverted to the external breathing mask for oxygen supply by using the pressure regulating valve 802, the first pipeline 13, the filter tee 12, the second pipeline 14 and the flow regulating valve 7, and returns to S121;

[0201] It should be noted that this state is when the user is inverted during the oxygen supply process (the tilting situation is consistent with this control method, the same below).

[0202] It should be noted that when inverted or tilted, oxygen is supplied to users. If the second vaporization coil 6 is not provided, the liquid oxygen entering the gas phase pipe 4 will not be vaporized, and will be diverted to the pressure relief valve 805 and the pressure regulating valve 802; since the temperature of liquid oxygen is extremely low, the valve plates of the pressure relief valve 805 and the pressure regulating valve 802 (the valve plates are made of low-temperature resistant rubber material, but will be frozen and cracked in direct contact with liquid oxygen) will be frozen and damaged, thereby causing damage to the pressure regulating valve 802 and leakage of liquid oxygen from the pressure relief valve 805 to the outside.

[0203] It should be noted that if the second vaporization coil 6 and the pressure regulating valve 802 are not provided and the gas phase pipe 4 and the external breathing hood are directly connected by a pipeline, the liquid oxygen will not pass through the vaporization link under the action of pressure, but will be directly guided to the external breathing hood for discharge through the gas phase pipe 4, causing liquid oxygen leakage and even injury to personnel.

[0204] It should be noted that, since the pressure regulating valve 802 and the flow regulating valve 7 are both in the open state, the isobaric circuit is connected to the outside world, and only a small amount of liquid oxygen is vaporized by the gas phase pipe 4 through the second vaporization coil 6 under the action of gravity to form oxygen; the oxygen generated and accumulated by the vaporization of liquid oxygen in the liquid storage tank 2 is diverted to the external breathing mask for oxygen supply through the liquid phase pipe 3, the first vaporization coil 5, the filtering tee 12, the second pipeline 14 and the flow regulating valve 7, which will rapidly reduce the pressure of the isobaric circuit; when the pressure of the isobaric circuit is ≤ the opening threshold of the pressure regulating valve 802, the pressure regulating valve 802 is closed.

[0205] S123, the first pressure passage is disconnected from the second pressure passage; the oxygen in the inverted liquid storage tank 2 is diverted to the external breathing mask for oxygen supply by using the liquid phase pipe 3, the first gasification coil 5, the filter tee 12, the second pipeline 14 and the flow regulating valve 7; the liquid oxygen in the inverted liquid storage tank 2 is gasified by the gas phase pipe 4 through the second gasification coil 6 to form oxygen, and this part of oxygen is then returned to the liquid storage tank 2 through the second gasification coil 6 and the gas phase pipe 4, and returns to S121;

[0206] It should be noted that if the second vaporization coil 6 is not provided, the liquid oxygen entering the gas phase pipe 4 will not be vaporized and will be directed to the pressure relief valve 805; since the temperature of the liquid oxygen is extremely low, the valve plate of the pressure relief valve 805 (the valve plate is made of low-temperature resistant rubber material, but will be frozen and cracked in direct contact with the liquid oxygen) will be frozen and damaged, thereby causing the liquid oxygen to leak from the pressure relief valve 805 to the outside.

[0207] S124, the first pressure passage is connected to the second pressure passage to form the isobaric circuit; the liquid oxygen in the liquid storage tank 2 enters the second vaporizing coil 6 through the gas phase pipe 4 under the action of gravity to be vaporized, and returns to S121;

[0208] It should be noted that when the flow regulating valve 7 is closed and the device is in standby mode, the gasification of liquid oxygen in the liquid storage tank 2 causes the pressure to rise rapidly, so the pressure regulating valve 802 will also open rapidly and be in a normally open state; in the standby state, when the oxygen supply device is tilted or inverted, the pressure regulating valve 802 is usually in an open state.

[0209] It should be noted that if the second vaporization coil 6 is not provided, in the standby state, as the internal pressure increases, the pressure relief valve 805 opens, and the liquid oxygen entering the gas phase pipe 4 will leak to the outside through the pressure relief valve 805 without being vaporized.

[0210] S125, the pressure relief valve 805 is opened, and the isobaric circuit is connected to the third airway 808 by opening the pressure relief valve 805, and oxygen is discharged to the outside for pressure relief, and the process returns to S121;

[0211] It should be noted that what is discharged to the outside at this time is gasified oxygen, and there will be no leakage of liquid oxygen, thereby reducing the loss of liquid oxygen and preventing damage to equipment caused by liquid oxygen leakage. In addition, the flow regulating valve 7 is in a closed state, and the oxygen supply device will not injure personnel due to liquid oxygen leakage.

[0212] S126, the pressure relief valve 805 is closed, the isobaric circuit and the third air channel 808 are disconnected, and the process returns to S121.

[0213] In a specific implementation, the oxygen supply device is provided with a second vaporization coil 6 and a control valve assembly 8, which can vaporize the liquid oxygen entering the gas phase pipe 4 when the device is tilted or inverted, thereby preventing the liquid oxygen from leaking from the pressure relief valve 805 or the external breathing mask without being vaporized, causing damage to the equipment or injury to personnel.

[0214] 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.

[0215] 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 may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A portable leak-proof oxygen supply device, characterized in that: It includes a shell, a liquid storage tank, a liquid phase pipe, a gas phase pipe, a first gasification coil, a second gasification coil, a flow regulating valve and a control valve assembly; The liquid storage tank has a cavity for accommodating liquid oxygen and is mounted inside the shell, with a vacuum interlayer formed between its outer wall and the inner wall of the shell; The first end of the liquid phase pipe passes through the shell and the liquid storage tank in sequence from top to bottom and extends to the bottom of the liquid storage tank, and the second end is connected to the first end of the first vaporization coil installed on the upper end of the shell; The gas phase pipe has a first end which passes through the shell and the liquid storage tank in sequence from top to bottom and extends to the top of the liquid storage tank, and a second end which is connected to the first end of the second gasification coil installed at the upper end of the shell; The second gasification coil is coiled and sleeved on the outer end surface of the first gasification coil; The control valve assembly is arranged at the upper end of the shell, and includes a control valve body, a pressure regulating valve, a first air inlet and a first air outlet; the first air inlet is arranged at one end of the control valve body and connected to the second end of the second gasification coil; the first air outlet is arranged at the other end of the control valve body and connected to the flow regulating valve through a pipeline; the pressure regulating valve is arranged at the upper end of the control valve body and is communicated with the first air inlet and the first air outlet respectively; The flow regulating valve is arranged at the upper end of the shell, and has a second air inlet and a second air outlet, the second air inlet is connected to the second end of the first gasification coil, and the second air outlet is connected to an external breathing mask; The pressure regulating valve cooperates with the flow regulating valve to adjust the oxygen supply flow; the pressure regulating valve cooperates with the second gasification coil to prevent leakage of liquid oxygen when the oxygen supply device is in an inverted state; The control valve assembly also includes a pressure relief valve; The pressure relief valve is arranged at the upper end of the control valve body and is connected to the first air inlet and the outside atmosphere respectively, and is used to limit the pressure difference between the first air inlet and the outside atmosphere; The control valve body is provided with a first air passage connecting the first air inlet, the pressure relief valve and the pressure regulating valve, a second air passage connecting the pressure regulating valve and the first air outlet, and a third air passage connecting the pressure relief valve and the outside atmosphere. A contact area between the first air passage and the pressure regulating valve is greater than a contact area between the second air passage and the pressure regulating valve.

2. The portable anti-leakage oxygen supply device according to claim 1, characterized in that: The liquid phase tube is nested inside the gas phase tube, and a gap is formed between the outer wall of the liquid phase tube and the inner wall of the gas phase tube.

3. The portable leak-proof oxygen supply device according to claim 1, characterized in that: The flow regulating valve also includes a regulating valve body and a flow regulating mechanism; The flow regulating mechanism is adjustably installed in the regulating valve body and can adjust the opening of the channel between the second air inlet and the second air outlet.

4. The portable anti-leakage oxygen supply device according to claim 1, characterized in that: The oxygen supply device further comprises an exhaust valve arranged at the upper end of the housing; The exhaust valve comprises an exhaust valve body, a third air inlet, a third air outlet, an exhaust port and a valve stem; The second end of the gas phase pipe is connected to the third gas inlet; The first end of the second gasification coil is connected to the third gas outlet, and the third gas inlet, the third gas outlet and the gas outlet are interconnected inside the exhaust valve body; The second end of the liquid phase pipe is connected to the first end of the first gasification coil after passing through the exhaust valve body via the third gas inlet; The valve stem is adjustably installed inside the exhaust valve body, and is used to connect or block the passage between the exhaust port and the third air inlet and the third air outlet.

5. The portable anti-leakage oxygen supply device according to claim 1, characterized in that: The oxygen supply device also includes a filling interface and a filling conduit; The filling interface is arranged at the bottom end of the shell, passes through the shell and the liquid storage tank from bottom to top and extends to the inside of the liquid storage tank; The filling conduit is arranged inside the liquid storage tank, with a first end connected to the upper end of the filling interface and a second end extending to the upper end inside the liquid storage tank.

6. The portable anti-leakage oxygen supply device according to claim 1, characterized in that: The oxygen supply device also includes a filtering tee; The filtering tee comprises a fourth air inlet, a fifth air inlet and a fourth air outlet which are interconnected, and a filter screen installed inside the fourth air inlet and the fourth air outlet; The fourth air inlet is connected to the second end of the first gasification coil; The fifth air inlet is connected to the first air outlet through a first pipeline; The fourth air outlet is connected to the second air inlet through a second pipeline; The filter screen is used to oxygenate the mist liquid; The liquid oxygen layer inside the liquid storage tank, the liquid phase pipe, the first gasification coil, the filtering tee, the first pipeline, the first gas outlet and the second gas channel form a first pressure passage; The oxygen layer inside the liquid storage tank, the gas phase pipe, the second gasification coil, the first air inlet and the first air channel form a second pressure passage.

7. An oxygen supply control method, applied to the portable anti-leakage oxygen supply device according to any one of claims 1 to 6, characterized in that: The method comprises: S1. respectively set the opening thresholds of the pressure regulating valve and the pressure relief valve, and keep the opening threshold of the pressure relief valve greater than the opening threshold of the pressure regulating valve; S2, adjusting the flow regulating mechanism to keep the flow regulating valve in a state of closing the oxygen supply; adjusting the valve stem to keep the third air inlet and the exhaust port in a connected state; S3, connecting the external liquid oxygen storage tank to the filling interface to fill the liquid oxygen; S4. When liquid oxygen is ejected from the exhaust port, disconnect the liquid oxygen storage tank from the filling interface, adjust the valve stem, and use the valve stem to close the passage between the third air inlet and the exhaust port to complete the filling of liquid oxygen; S5, the liquid oxygen filled into the liquid storage tank is vaporized in real time to generate oxygen, and the generated oxygen is directed to the pressure regulating valve by using the second pressure passage; the liquid oxygen in the liquid storage tank is directed to the first vaporizing coil by using the liquid phase pipe, and the liquid oxygen is vaporized by using the first vaporizing coil to obtain vaporized oxygen; the oxygen is reversely directed to the liquid storage tank by using the first vaporizing coil and the liquid phase pipe, and the pressure value in the second pressure passage increases; S6, when the pressure in the second pressure passage is less than or equal to the opening threshold of the pressure regulating valve, the second air inlet and the second air outlet are disconnected, and the oxygen supply device is not inverted, executing S7; When the pressure in the second pressure passage is greater than the opening threshold of the pressure regulating valve, the second air inlet and the second air outlet are disconnected, and the oxygen supply device is not inverted, executing S8; When the pressure in the isobaric circuit is greater than the opening threshold of the pressure relief valve, the second air inlet and the second air outlet are disconnected, and the oxygen supply device is not inverted, executing S9; When the pressure of the isobaric circuit is less than or equal to the opening threshold of the pressure relief valve, the second air inlet and the second air outlet are disconnected, and the oxygen supply device is not inverted, executing S10; When the flow regulating mechanism is adjusted to connect the second air inlet and the second air outlet, executing S11; When the oxygen supply device is inverted, executing S12; S7, the pressure regulating valve remains closed, and the process returns to S6; S8, the pressure regulating valve is opened; the first pressure passage is connected with the second pressure passage to form an isobaric circuit, and the process returns to S6; S9, the pressure relief valve is opened to connect the isobaric circuit with the outside atmosphere, and the process returns to S6; S10, the pressure relief valve is closed to disconnect the third airway from the isobaric circuit, and the process returns to S6; S11, the oxygen supply device implements oxygen supply; S12. Preventing liquid oxygen leakage by using the control valve assembly and the second vaporization coil.

8. The oxygen supply control method according to claim 7, characterized in that: The oxygen supply device implements oxygen supply, including: S111, the oxygen gasified in the liquid storage tank is guided to the external breathing mask for oxygen supply through the second pressure passage, the pressure regulating valve, the first pipeline, the filtering tee, the second pipeline and the flow regulating valve under the action of the pressure difference between the isobaric circuit and the outside, and the pressure of the isobaric circuit is reduced; S112, when the pressure of the isobaric circuit is less than or equal to the opening threshold of the pressure regulating valve, the pressure regulating valve is closed; the liquid oxygen in the liquid storage tank is pressed into the liquid phase pipe and the first vaporizing coil for vaporization to generate oxygen by utilizing the pressure difference between the first pressure passage and the second pressure passage, and the oxygen is directed to the external breathing mask for oxygen supply by utilizing the first pressure passage, the filtering tee, the second pipeline and the flow regulating valve; S113, when the flow regulating mechanism is adjusted to increase the opening of the channel between the second air inlet and the second air outlet, executing S114; When the flow regulating mechanism is adjusted to reduce the opening of the channel between the second air inlet and the second air outlet, S115 is executed; When the flow regulating mechanism is adjusted to disconnect the second air inlet and the second air outlet, return to S6; S114, the pressure difference between the first pressure passage and the second pressure passage is increased, and the pressure difference is used to pressurize more liquid oxygen into the liquid phase pipe and the first vaporization coil to accelerate vaporization and produce more oxygen, so as to obtain more oxygen supply flow, and return to S112; S115, the pressures of the first pressure passage and the second pressure passage are both increased; and the pressure difference between the first pressure passage and the second pressure passage is reduced; the liquid oxygen in the liquid storage tank is reduced to be pressed into the first vaporizing coil for vaporization, so as to slow down the oxygen supply; S116. When the pressure of the second pressure passage is greater than the opening threshold of the pressure regulating valve, the pressure regulating valve is opened, the first pressure passage and the second pressure passage are connected to form the isobaric circuit, and the process returns to S111.

9. The oxygen supply control method according to claim 7 or 8, characterized in that: The method of preventing liquid oxygen leakage by using the control valve assembly and the second vaporizing coil comprises: S121, when the flow regulating valve is in an open state and the pressure regulating valve is in an open state, execute S122; When the flow regulating valve is in an open state and the pressure regulating valve is in a closed state, executing S123; When the flow regulating valve is in a closed state and the pressure regulating valve is in an open state, executing S124; When the pressure in the isobaric circuit gradually increases to a value greater than the pressure relief valve opening threshold, executing S125; When the pressure in the isobaric circuit gradually decreases to a value less than or equal to the opening threshold of the pressure relief valve, executing S126; When the oxygen supply device returns to normal, return to step S6; S122, the first pressure passage is connected to the second pressure passage to form the isobaric circuit; the oxygen in the inverted liquid storage tank is diverted to the external breathing mask for oxygen supply by using the liquid phase pipe, the first gasification coil, the filter tee, the second pipeline and the flow regulating valve; the liquid oxygen in the inverted liquid storage tank is gasified by the gas phase pipe through the second gasification coil to form oxygen, and this part of oxygen is diverted to the external breathing mask for oxygen supply by using the pressure regulating valve, the first pipeline, the filter tee, the second pipeline and the flow regulating valve, and then returns to S121; S123, the first pressure passage is disconnected from the second pressure passage; the oxygen in the inverted liquid storage tank is diverted to the external breathing mask for oxygen supply by using the liquid phase pipe, the first gasification coil, the filter tee, the second pipeline and the flow regulating valve; the liquid oxygen in the inverted liquid storage tank is gasified by the second gasification coil through the gas phase pipe to form oxygen, and this part of oxygen is then returned to the liquid storage tank through the second gasification coil and the gas phase pipe, and returns to S121; S124, the first pressure passage is connected to the second pressure passage to form the isobaric circuit; the liquid oxygen in the liquid storage tank enters the second vaporizing coil through the gas phase pipe under the action of gravity to be vaporized, and returns to S121; S125, the pressure relief valve is opened, and the isobaric circuit is connected to the third airway by opening the pressure relief valve, and oxygen is discharged to the outside for pressure relief, and the process returns to S121; S126, the pressure relief valve is closed, the isobaric circuit and the third air channel are disconnected, and the process returns to S121.

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