Closed diving respirator with emergency breathing gas supply function and supply method

Abstract

According to the closed diving respirator with the emergency breathing gas supply function and the supply method, an oxygen bottle, an oxygen pressure reducing valve, an electromagnetic valve and an inspiration bag form an automatic oxygen supply pipeline, and a dilution gas bottle, a dilution gas pressure reducing valve, an automatic gulp valve and the inspiration bag form an automatic gulp pipeline; an emergency breathing gas supply device composed of two manual switching valves, an oxygen supply nozzle and a diluent gas nozzle is additionally arranged, a diluent gas pressure reducing valve is of a constant proportion type, and the oxygen supply nozzle is a fixed mass flow nozzle; the input end of the manual switching valve 1 is connected with an oxygen pressure reducing valve pipeline, the output switching end 1 is connected with an electromagnetic valve pipeline, the output switching end 2 is connected with an oxygen supply nozzle pipeline, the input end of the manual switching valve 2 is connected with a proportional pressure reducing valve pipeline, the output switching end 1 is connected with an automatic gulp valve pipeline, and the output switching end 2 is connected with a diluted gas nozzle pipeline. When the constant oxygen partial pressure control fails, a warning is displayed and sent out, and a diver manually switches the two manual switching valves to achieve the emergency breathing gas supply function.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of closed-circuit breathing apparatus, in particular to a constant partial pressure closed-circuit breathing apparatus with emergency breathing gas supply function. BACKGROUND

[0002] The constant partial pressure closed-circuit breathing apparatus is used for deep diving, and if the oxygen partial pressure control fails, an emergency open-circuit breathing apparatus needs to be used. The oxygen concentration in the emergency open-circuit breathing apparatus is difficult to be appropriate. If 1.3 ata is used as the maximum oxygen partial pressure, the oxygen concentration in the emergency gas cylinder can only be 12% at most when diving to 100 m (US Navy Diving Manual MK16), otherwise it cannot play a dilution role. However, using this oxygen concentration gas for emergency breathing will have the risk of oxygen deficiency when decompressed to 5 m or more.

[0003] Foreign countries have not proposed a better solution to this problem: the M16 constant partial pressure closed-circuit breathing apparatus of the United States, which has a maximum depth of 90 m, does not carry an emergency gas cylinder itself. When the breathing apparatus fails, a water surface signal operator needs to lower an emergency breathing apparatus to the first stop station, and the diver needs to quickly ascend to the first stop station and use the emergency breathing apparatus for breathing. Since the first stop station at 300 fsw (91.4 m) in the MK16 decompression table is 180 fsw (54.9 m) at the deepest, the emergency breathing apparatus filled with 21% oxygen concentration gas can ensure the safety of the entire decompression, but during the period from the failure at 300 fsw to the first stop station, the diver is actually using the failed breathing apparatus, which is extremely unsafe. SUMMARY

[0004] The present application provides a constant partial pressure closed-circuit breathing apparatus with emergency breathing gas supply function.

[0005] The present application solves the above technical problems by the following technical solutions: The present application provides a closed-circuit diving breathing apparatus with emergency breathing gas supply function, which comprises an oxygen cylinder, an oxygen decompression valve, an electromagnetic valve, an automatic oxygen supply pipeline composed of an air bag, a dilution gas cylinder, a dilution gas decompression valve, an automatic air supplement valve, and an automatic air supplement pipeline composed of an air bag, characterized in that it further comprises an emergency breathing gas supply device composed of a manual switching valve 1, an oxygen supply nozzle, a manual switching valve 2, and a dilution gas nozzle, the dilution gas decompression valve is selected as a constant ratio decompression valve, and the oxygen supply nozzle is a constant mass flow nozzle. The input end of the manual switching valve 1 is connected to the oxygen pressure reducing valve pipeline, the output switching end 1 is connected to the solenoid valve pipeline, and the output switching end 2 is connected to the oxygen supply nozzle pipeline. The output switching end 1 of the manual switching valve 1 and the solenoid valve are in a normally open state. The input end of the manual switching valve 2 is connected to the proportional pressure reducing valve pipeline, the output switching end 1 is connected to the automatic gas replenishment valve pipeline, and the output switching end 2 is connected to the dilution gas nozzle pipeline. The output switching end 1 of the manual switching valve 2 and the automatic gas replenishment valve are in a normally open state. The controller of the closed-circuit diving breathing apparatus is used to display and issue an emergency warning when the constant oxygen partial pressure control fails. Under the warning, the diver manually switches and adjusts the manual switching valve 1 and manual switching valve 2 to open the emergency oxygen supply pipeline consisting of the oxygen cylinder, oxygen pressure reducing valve, manual switching valve 1, oxygen supply nozzle and inhalation bag, and to open the emergency dilution gas supply pipeline consisting of the dilution gas cylinder, constant ratio pressure reducing valve, manual switching valve 2, dilution gas nozzle and inhalation bag.

[0006] This invention also provides an emergency breathing gas replenishment method for a closed-circuit diving respirator, which utilizes the aforementioned closed-circuit diving respirator and includes the following steps: S1. Configure the constant ratio pressure reducing valve and the oxygen supply nozzle, wherein the oxygen supply nozzle is a constant mass flow nozzle; S2. The controller of the closed-loop diving breathing apparatus displays and issues an emergency warning when the constant oxygen partial pressure control fails. S3. Under warning, the diver manually switches and adjusts the manual switching valve 1 and manual switching valve 2 to connect the emergency oxygen supply pipeline consisting of the oxygen cylinder, oxygen pressure reducing valve, manual switching valve 1, oxygen supply nozzle and inhalation bag, and the emergency dilution gas supply pipeline consisting of the dilution gas cylinder, constant ratio pressure reducing valve, manual switching valve 2, dilution gas nozzle and inhalation bag.

[0007] The positive and progressive effects of this invention are as follows: This invention designs a novel closed-circuit diving respirator, incorporating an emergency breathing gas replenishment device on a constant oxygen partial pressure respirator. This device is activated by two manually operated switching valves. When the oxygen partial pressure control of the closed-circuit diving respirator fails, the two manually operated switching valves disconnect the oxygen partial pressure control circuit and simultaneously activate the emergency breathing gas replenishment device. This device can replenish the breathing circuit with an appropriate ratio of oxygen and dilution gas carried by the constant oxygen partial pressure respirator according to changes in depth, maintaining the oxygen partial pressure within a safe range (0.2 ata-1.8 ata), eliminating the need to carry a separate emergency respirator. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of a closed-loop diving respirator with emergency breathing gas replenishment function, which is a preferred embodiment of the present invention.

[0009] Figure 2 The following is a coordinate system diagram of lines 11, 12, 21 and 22, which are preferred embodiments of the present invention.

[0010] Figure 3 The following is a coordinate system diagram of lines 1, 2, 3 and 4, which are preferred embodiments of the present invention. Detailed Implementation

[0011] like Figure 1 As shown, this embodiment of the invention provides a closed-circuit diving respirator with emergency breathing gas replenishment function. It includes an automatic oxygen supply pipeline consisting of an oxygen cylinder, an oxygen pressure reducing valve, a solenoid valve, and an inhalation bag; and an automatic air replenishment pipeline consisting of a dilution gas cylinder, a dilution gas pressure reducing valve, an automatic air replenishment valve, and an inhalation bag. An emergency breathing gas replenishment device consisting of a manual switching valve 1, an oxygen supply nozzle, a manual switching valve 2, and a dilution gas nozzle is also added. The dilution gas pressure reducing valve is a proportional pressure reducing valve; the oxygen supply nozzle is a constant mass flow nozzle, designed to be 1.2 L / min.

[0012] The input end of manual switching valve 1 is connected to the oxygen pressure reducing valve pipeline, the output switching end 1 is connected to the solenoid valve pipeline, and the output switching end 2 is connected to the oxygen supply nozzle pipeline. The output switching end 1 of manual switching valve 1 and the solenoid valve are in the normally open state, that is, manual switching valve 1 and the solenoid valve are connected. The input end of manual switching valve 2 is connected to the proportional pressure reducing valve pipeline, the output switching end 1 is connected to the automatic gas replenishment valve pipeline, and the output switching end 2 is connected to the dilution gas nozzle pipeline. The output switching end 1 of manual switching valve 2 and the automatic gas replenishment valve are in the normally open state, that is, manual switching valve 2 and the automatic gas replenishment valve are connected.

[0013] The controller of the closed-circuit diving breathing apparatus is used to display and issue an emergency warning when the constant oxygen partial pressure control fails. Under the warning, the diver manually switches and adjusts manual switching valve 1 and manual switching valve 2 to connect manual switching valve 1 and the oxygen supply nozzle, thereby connecting the emergency oxygen supply pipeline consisting of the oxygen cylinder, oxygen pressure reducing valve, manual switching valve 1, oxygen supply nozzle and breathing bag. It also connects manual switching valve 2 and dilution gas nozzle, thereby connecting the emergency dilution gas supply pipeline consisting of the dilution gas cylinder, constant ratio pressure reducing valve, manual switching valve 2, dilution gas nozzle and breathing bag.

[0014] In this embodiment, if a pure nitrogen or pure helium cylinder is used as the dilution gas, then pure nitrogen or pure helium can be used directly as the dilution gas. In the event of an oxygen circuit failure, as long as the oxygen cylinder and the dilution gas cylinder are normal, the breathing circuit can be safely supplied with gas through the emergency breathing gas supply device without the need for an additional emergency breathing apparatus.

[0015] When the constant oxygen partial pressure control malfunctions, the diver stops diving. At this point, the diver's oxygen consumption C is typically set as [minimum oxygen consumption, maximum oxygen consumption], specifically [0.5 L / min, 1 L / min]. To maintain a safe oxygen partial pressure in the breathing circuit, it is set as [minimum oxygen partial pressure, maximum oxygen partial pressure], specifically [0.2 ata, 1.8 ata]. The flow rate of the dilution gas at different depths is determined based on the oxygen consumption. The calculation formula is as follows: It can be deduced that: P = Diving depth / 10 + 1 In the above formula, P represents the partial pressure of oxygen at a certain depth, and C represents the oxygen consumption of a diver, in L / min. The pure oxygen supply flow rate of the oxygen supply nozzle. The dilution gas flow rate for the dilution gas nozzle.

[0016] Based on the design depth of 100 meters for the respirator, the dilution gas flow rate at different depths was calculated using the formula under the conditions of minimum oxygen consumption (0.5 L / min) and minimum oxygen partial pressure (0.2 ata). And draw a straight line in the coordinate system as line 11 (see Figure 2 In the coordinate system, the horizontal axis represents depth (m), and the vertical axis represents flow rate (L / min).

[0017] The dilution gas flow rate at different depths was calculated using the formula under the conditions of minimum oxygen consumption (0.5 L / min) and maximum oxygen partial pressure (1.8 ata). And draw a straight line in the coordinate system as line 12 (see Figure 2 (The dilution gas flow rate corresponding to a depth of 100 meters). = (1.2 - 0.5) * (11 / 1.8 - 1) = 3.577.

[0018] The dilution gas flow rate at different depths was calculated using the formula under the conditions of maximum oxygen consumption (1 L / min) and minimum oxygen partial pressure (0.2 ata). And draw a straight line in the coordinate system as line 21 (see Figure 2 (The dilution gas flow rate corresponding to a depth of 100 meters). = (1.2 - 0.5) * (11 / 1.8 - 1) = 10.8.

[0019] The dilution gas flow rate at different depths was calculated using the formula under the conditions of maximum oxygen consumption (1 L / min) and maximum oxygen partial pressure (1.8 ata). And draw a straight line in the coordinate system as line 22 (see Figure 2 ).

[0020] In the coordinate system, the two lines corresponding to the overlapping range between lines 11 and 12 and between lines 21 and 22 are lines 12 and 21, respectively. The lower line (line 12) and the upper line (line 21) are respectively designated as line 1 (minimum oxygen consumption, maximum oxygen partial pressure) and line 2 (maximum oxygen consumption, minimum oxygen partial pressure) (see...). Figure 3 ).

[0021] Line 1 represents the minimum oxygen consumption and maximum oxygen partial pressure. Based on the coordinates at the design depth of line 1 (design depth 100), Draw a straight line as line 3 using the coordinates of 3.577 and the origin (0, 0). Figure 3 ).

[0022] Line 2 represents the maximum oxygen consumption and minimum oxygen partial pressure. Based on the coordinates at the design depth of line 2 (design depth 100), 10.8) and the origin coordinates (0, 0) to draw a straight line as line 4 (see Figure 3 ).

[0023] The proportional range of the proportional pressure reducing valve is determined to be [0.036, 0.108] based on the slopes K=0.036 and K=0.108 of line 3 and line 4, respectively.

[0024] This invention also provides an emergency breathing gas replenishment method for a closed-circuit diving respirator, which utilizes the aforementioned closed-circuit diving respirator and includes the following steps: S1. Configure a constant ratio pressure reducing valve and an oxygen supply nozzle. The oxygen supply nozzle is a constant mass flow nozzle.

[0025] When the constant oxygen partial pressure control malfunctions, the diver stops diving. At this point, the diver's oxygen consumption C is typically set as [minimum oxygen consumption, maximum oxygen consumption], specifically [0.5 L / min, 1 L / min]. To maintain a safe oxygen partial pressure in the breathing circuit, it is set as [minimum oxygen partial pressure, maximum oxygen partial pressure], specifically [0.2 ata, 1.8 ata]. The flow rate of the dilution gas at different depths is determined based on the oxygen consumption. The calculation formula is as follows: It can be deduced that: P = Diving depth / 10 + 1 In the above formula, P represents the partial pressure of oxygen at a certain depth, and C represents the oxygen consumption of a diver, in L / min. The pure oxygen supply flow rate of the oxygen supply nozzle. The dilution gas flow rate for the dilution gas nozzle.

[0026] Based on the design depth of 100 meters for the respirator, the dilution gas flow rate at different depths was calculated using the formula under the conditions of minimum oxygen consumption (0.5 L / min) and minimum oxygen partial pressure (0.2 ata). And draw a straight line in the coordinate system as line 11 (see Figure 2 ).

[0027] The dilution gas flow rate at different depths was calculated using the formula under the conditions of minimum oxygen consumption (0.5 L / min) and maximum oxygen partial pressure (1.8 ata). And draw a straight line in the coordinate system as line 12 (see Figure 2 (The dilution gas flow rate corresponding to a depth of 100 meters). = (1.2 - 0.5) * (11 / 1.8 - 1) = 3.577.

[0028] The dilution gas flow rate at different depths was calculated using the formula under the conditions of maximum oxygen consumption (1 L / min) and minimum oxygen partial pressure (0.2 ata). And draw a straight line in the coordinate system as line 21 (see Figure 2 (The dilution gas flow rate corresponding to a depth of 100 meters). = (1.2 - 0.5) * (11 / 1.8 - 1) = 10.8.

[0029] The dilution gas flow rate at different depths was calculated using the formula under the conditions of maximum oxygen consumption (1 L / min) and maximum oxygen partial pressure (1.8 ata). And draw a straight line in the coordinate system as line 22 (see Figure 2 ).

[0030] The two lines corresponding to the overlapping range between lines 11 and 12 and between lines 21 and 22 are designated as line 1 (minimum oxygen consumption, maximum oxygen partial pressure) and line 2 (maximum oxygen consumption, minimum oxygen partial pressure), respectively (see...). Figure 3 ).

[0031] Line 1 represents the minimum oxygen consumption and maximum oxygen partial pressure. Based on the coordinates at the design depth of line 1 (design depth 100), Draw a straight line as line 3 using the coordinates of 3.577 and the origin (0, 0). Figure 3 ).

[0032] Line 2 represents the maximum oxygen consumption and minimum oxygen partial pressure. Based on the coordinates at the design depth of line 2 (design depth 100), 10.8) and the origin coordinates (0, 0) to draw a straight line as line 4 (see Figure 3 ).

[0033] The proportional range of the proportional pressure reducing valve is determined to be [0.036, 0.108] based on the slopes of line 3 (0.036) and line 4 (0.108).

[0034] S2. The controller of the closed-circuit diving breathing apparatus displays and issues an emergency warning when the constant oxygen partial pressure control malfunctions.

[0035] S3. Under warning, the diver manually switches and adjusts manual switching valve 1 and manual switching valve 2 to connect the emergency oxygen supply pipeline consisting of oxygen cylinder, oxygen pressure reducing valve, manual switching valve 1, oxygen supply nozzle and breathing bag, and the emergency dilution gas supply pipeline consisting of dilution gas cylinder, fixed ratio pressure reducing valve, manual switching valve 2, dilution gas nozzle and breathing bag.

[0036] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A closed-circuit diving respirator with emergency breathing gas replenishment function, comprising an automatic oxygen supply pipeline consisting of an oxygen cylinder, an oxygen pressure reducing valve, a solenoid valve, and an inhalation bag, and an automatic air replenishment pipeline consisting of a dilution gas cylinder, a dilution gas pressure reducing valve, an automatic air replenishment valve, and an inhalation bag, characterized in that, It also includes an emergency breathing gas supply device consisting of a manual switching valve 1, an oxygen supply nozzle, a manual switching valve 2, and a dilution gas nozzle. The dilution gas pressure reducing valve is a ratio pressure reducing valve, and the oxygen supply nozzle is a constant mass flow nozzle. The input end of the manual switching valve 1 is connected to the oxygen pressure reducing valve pipeline, the output switching end 1 is connected to the solenoid valve pipeline, and the output switching end 2 is connected to the oxygen supply nozzle pipeline. The output switching end 1 of the manual switching valve 1 and the solenoid valve are in a normally open state. The input end of the manual switching valve 2 is connected to the proportional pressure reducing valve pipeline, the output switching end 1 is connected to the automatic gas replenishment valve pipeline, and the output switching end 2 is connected to the dilution gas nozzle pipeline. The output switching end 1 of the manual switching valve 2 and the automatic gas replenishment valve are in a normally open state. The controller of the closed-circuit diving breathing apparatus is used to display and issue an emergency warning when the constant oxygen partial pressure control fails. Under the warning, the diver manually switches and adjusts the manual switching valve 1 and manual switching valve 2 to open the emergency oxygen supply pipeline consisting of the oxygen cylinder, oxygen pressure reducing valve, manual switching valve 1, oxygen supply nozzle and inhalation bag, and to open the emergency dilution gas supply pipeline consisting of the dilution gas cylinder, constant ratio pressure reducing valve, manual switching valve 2, dilution gas nozzle and inhalation bag.

2. The closed-circuit diving breathing apparatus with emergency breathing gas replenishment function as described in claim 1, characterized in that, When the constant oxygen partial pressure control malfunctions, the diver stops diving. At this point, the diver's oxygen consumption C is set as [minimum oxygen consumption, maximum oxygen consumption]. To maintain a safe oxygen partial pressure in the breathing circuit, it is set as [minimum oxygen partial pressure, maximum oxygen partial pressure]. The flow rate of the dilution gas at different depths is determined based on the oxygen consumption. The calculation formula is as follows: It can be deduced that: P = Diving depth / 10 + 1 In the above formula, P represents the partial pressure of oxygen at a certain depth, and C represents the oxygen consumption of a diver, in L / min. This refers to the pure oxygen supply flow rate of the oxygen supply nozzle. The dilution gas flow rate for the dilution gas nozzle; Based on the design depth of the respirator, the dilution gas flow rate at different depths under the conditions of minimum oxygen consumption and minimum oxygen partial pressure was calculated using a calculation formula. A straight line, designated as line 11, is plotted in the coordinate system. The dilution gas flow rate at different depths under the conditions of minimum oxygen consumption and maximum oxygen partial pressure is then calculated using the formula. A straight line, designated as line 12, is plotted on a coordinate system. The dilution gas flow rate at different depths under conditions of maximum oxygen consumption and minimum oxygen partial pressure is then calculated using the appropriate formula. A straight line, designated as line 21, is plotted in the coordinate system. The dilution gas flow rate at different depths under the conditions of maximum oxygen consumption and maximum oxygen partial pressure is then calculated using the formula. And draw a straight line as line 22 in the coordinate system; The two lines corresponding to the overlapping range between lines 11 and 12 and between lines 21 and 22 are designated as line 1 and line 2, respectively. A line is drawn based on the coordinates of the design depth of line 1 and the origin coordinates as line 3, and a line is drawn based on the coordinates of the design depth of line 2 and the origin coordinates as line 4. The lower limit and upper limit of the proportional range of the proportional pressure reducing valve are determined based on the slopes of lines 3 and 4, respectively.

3. The closed-circuit diving breathing apparatus with emergency breathing gas replenishment function as described in claim 2, characterized in that, Assume the diver's oxygen consumption C, with the minimum oxygen consumption minus the maximum oxygen consumption, is 0.5-1 L / min, and the safe oxygen partial pressure... The minimum and maximum oxygen partial pressures are 0.2-1.8 ata, and the pure oxygen supply flow rate of the oxygen supply nozzle is... The flow rate is 1.2 L / min, and the design depth of the respirator is 100 meters. Line 1 represents the minimum oxygen consumption and maximum oxygen partial pressure. Based on the coordinates at the design depth of line 1 (design depth 100), Draw a straight line as line 3 using the coordinates of 3.577 and the origin (0, 0); Line 2 represents the maximum oxygen consumption and minimum oxygen partial pressure. Based on the coordinates at the design depth of line 2 (design depth 100), Draw a straight line as line 4 using the coordinates of 10.8 and the origin (0, 0); The proportional range of the proportional pressure reducing valve is determined to be [0.036, 0.108] based on the slopes of line 3 (0.036) and line 4 (0.108).

4. The closed-circuit diving breathing apparatus with emergency breathing gas replenishment function as described in claim 1, characterized in that, The dilution gas cylinder is a pure nitrogen cylinder or a pure helium cylinder.

5. A method for emergency breathing gas replenishment in a closed-circuit diving respirator, characterized in that, The method of achieving this using the closed-circuit diving respirator of claim 1 includes the following steps: S1. Configure the constant ratio pressure reducing valve and the oxygen supply nozzle, wherein the oxygen supply nozzle is a constant mass flow nozzle; S2. The controller of the closed-loop diving breathing apparatus displays and issues an emergency warning when the constant oxygen partial pressure control fails. S3. Under warning, the diver manually switches and adjusts the manual switching valve 1 and manual switching valve 2 to connect the emergency oxygen supply pipeline consisting of the oxygen cylinder, oxygen pressure reducing valve, manual switching valve 1, oxygen supply nozzle and inhalation bag, and the emergency dilution gas supply pipeline consisting of the dilution gas cylinder, constant ratio pressure reducing valve, manual switching valve 2, dilution gas nozzle and inhalation bag.

6. The emergency breathing gas replenishment method for a closed-circuit diving respirator as described in claim 5, characterized in that, In S1, when the constant oxygen partial pressure control malfunctions, the diver stops diving. At this time, the diver's oxygen consumption C is set as [minimum oxygen consumption, maximum oxygen consumption]. To maintain a safe oxygen partial pressure in the breathing circuit, it is set as [minimum oxygen partial pressure, maximum oxygen partial pressure]. The flow rate of the dilution gas at different depths is determined based on the oxygen consumption. The calculation formula is as follows: It can be deduced that: P = Diving depth / 10 + 1 In the above formula, P represents the partial pressure of oxygen at a certain depth, and C represents the oxygen consumption of a diver, in L / min. This refers to the pure oxygen supply flow rate of the oxygen supply nozzle. The dilution gas flow rate for the dilution gas nozzle; Based on the design depth of the respirator, the dilution gas flow rate at different depths under the conditions of minimum oxygen consumption and minimum oxygen partial pressure was calculated using a calculation formula. A straight line, designated as line 11, is plotted in the coordinate system. The dilution gas flow rate at different depths under the conditions of minimum oxygen consumption and maximum oxygen partial pressure is then calculated using the formula. A straight line, designated as line 12, is plotted on a coordinate system. The dilution gas flow rate at different depths under conditions of maximum oxygen consumption and minimum oxygen partial pressure is then calculated using the appropriate formula. A straight line, designated as line 21, is plotted in the coordinate system. The dilution gas flow rate at different depths under the conditions of maximum oxygen consumption and maximum oxygen partial pressure is then calculated using the formula. And draw a straight line as line 22 in the coordinate system; The two lines corresponding to the overlapping range between lines 11 and 12 and between lines 21 and 22 are designated as line 1 and line 2, respectively. A line is drawn based on the coordinates of the design depth of line 1 and the origin coordinates as line 3, and a line is drawn based on the coordinates of the design depth of line 2 and the origin coordinates as line 4. The lower limit and upper limit of the proportional range of the proportional pressure reducing valve are determined based on the slopes of lines 3 and 4, respectively.

7. The emergency breathing gas replenishment method for a closed-circuit diving respirator as described in claim 6, characterized in that, Assume the diver's oxygen consumption C, with the minimum oxygen consumption minus the maximum oxygen consumption, is 0.5-1 L / min, and the safe oxygen partial pressure... The minimum and maximum oxygen partial pressures are 0.2-1.8 ata, and the pure oxygen supply flow rate of the oxygen supply nozzle is... The flow rate is 1.2 L / min, and the design depth of the respirator is 100 meters. Line 1 represents the minimum oxygen consumption and maximum oxygen partial pressure. Based on the coordinates at the design depth of line 1 (design depth 100), Draw a straight line as line 3 using the coordinates of 3.577 and the origin (0, 0); Line 2 represents the maximum oxygen consumption and minimum oxygen partial pressure. Based on the coordinates at the design depth of line 2 (design depth 100), Draw a straight line as line 4 using the coordinates of 10.8 and the origin (0, 0); The proportional range of the proportional pressure reducing valve is determined to be [0.036, 0.108] based on the slopes of line 3 (0.036) and line 4 (0.108).

8. The emergency breathing gas replenishment method for a closed-circuit diving respirator as described in claim 5, characterized in that, In S3, the dilution gas cylinder is a pure nitrogen cylinder or a pure helium cylinder.

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