A high-pressure oxygen charging and discharging valve group for ships

Abstract

The present invention discloses a high-pressure oxygen charging and discharging valve group for ships, including a main stop valve, a charging auxiliary valve and a discharging auxiliary valve, wherein the main stop valve is provided with three mutually connectable interfaces C, interface D and interface E; the charging auxiliary valve is provided with an interface A and an interface F which are mutually connectable; the discharging auxiliary valve is provided with an interface B and an interface G which are mutually connectable; the interface C of the main stop valve is connected with a downstream high-pressure oxygen system pipeline; the interface D of the main stop valve is connected with the interface F of the charging auxiliary valve through a first pipeline; the interface G of the main stop valve is connected with the interface G of the discharging auxiliary valve through a second pipeline; and a protective shell is provided outside the first pipeline and the second pipeline. The beneficial effects of the present invention are as follows: the valve group of the present invention integrates the three valve blocks of the main stop valve, the charging auxiliary valve and the discharging auxiliary valve into a plug-in integrated design, realizes the functional integration of charging and discharging, is safe to operate, and is convenient for modular replacement and maintenance.

Description

Technical Field

[0001] The invention relates to pipeline fittings of a high-pressure oxygen system of a ship system, and in particular to a high-pressure oxygen charging and discharging valve group for ships. Background Art

[0002] In the high-pressure oxygen system for underwater manned vehicles such as ships and deep-sea manned platforms, it is necessary to set up a valve group to control valves and interfaces for filling and discharging high-pressure oxygen. When the underwater manned vehicle is on the surface of the water, the filling port of the valve group is connected to the oxygen filling pipeline of the high-pressure oxygen filling equipment to achieve safe filling and control of high-pressure oxygen; when the underwater manned vehicle needs to be repaired and the high-pressure oxygen in the high-pressure oxygen system is removed, the oxygen inside the high-pressure oxygen system is discharged through the valve group to meet the oxygen filling and discharge requirements of the underwater manned vehicle. However, during the oxygen filling process, when the upstream filling hose ruptures, burns, or other faults occur, the existing valve group is difficult to cut off the oxygen passage in time, causing the high-pressure oxygen that has been filled into the high-pressure oxygen system to flow back. In severe cases, the combustion will continue and the high-pressure oxygen will flow back at a high speed, causing greater harm. In addition, the sealing performance of the existing valve group is poor. When subjected to the impact, vibration and swaying of the ship, the high-pressure oxygen inside it is prone to leakage. Since extremely high-pressure oxygen flows through the inside of the valve, it is a high-pressure oxygen valve. High-pressure oxygen is an extremely strong oxidant and can easily oxidize the valve group. Seawater corrosion will also reduce the service life of the existing valve group. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic non-return, safe and reliable high-pressure oxygen charging and discharging valve group for ships in view of the deficiencies in the prior art.

[0004] The technical solution adopted by the present invention is: a high-pressure oxygen charging and discharging valve group for ships, including a main stop valve, a charging auxiliary valve and a discharging auxiliary valve, the main stop valve is provided with three mutually connectable interfaces C, interface D and interface E; the charging auxiliary valve is provided with an interface A and an interface F that are interconnected; the discharging auxiliary valve is provided with an interface B and an interface G that are interconnected; the interface C of the main stop valve is connected to the downstream high-pressure oxygen system pipeline; the interface D of the main stop valve is connected to the interface F of the charging auxiliary valve through a first pipeline; the main stop valve Interface G is connected to interface G of the discharge auxiliary valve through a second pipeline; a protective shell is provided on the outside of the first pipeline and the second pipeline; interface A of the charging auxiliary valve is the charging port; interface B of the discharge auxiliary valve is the discharge port; when high-pressure oxygen is charged, interface A of the charging auxiliary valve is connected to the high-pressure oxygen charging equipment, the main stop valve is opened, and the charging auxiliary valve is connected to the downstream high-pressure oxygen system pipeline; when high-pressure oxygen is discharged, the discharge tool is connected to interface B of the discharge auxiliary valve, the main stop valve is opened, and the discharge auxiliary valve is connected to the downstream high-pressure oxygen system pipeline.

[0005] According to the above scheme, the main stop valve includes a stop valve body, a stop valve core, a main shaft sleeve, a valve stem main shaft and a handle; the interface C, the interface D and the interface E are all opened on the stop valve body; the stop valve body is provided with a first flow channel connected to the interface C, a second flow channel connected to the interface D, and a third flow channel connected to the interface E, and the first flow channel, the second flow channel and the third flow channel are connected in sequence; the stop valve body is provided with a mounting groove, the stop valve core and the valve stem main shaft are both assembled in the mounting groove, the end of the stop valve core is hinged with the main shaft sleeve, the main shaft sleeve is threadedly connected to one end of the valve stem main shaft, and the other end of the valve stem main shaft is connected to the external handle after extending out of the stop valve body and the stop valve cover; when the handle is turned, the valve stem main shaft rotates accordingly, and drives the main shaft sleeve to rotate and rise and fall, and the main shaft sleeve drives the stop valve core to move non-rotatably along the direction of the valve stem main shaft through the hinge connection structure, so that the stop valve core closes or opens the connecting port between the first flow channel and the second flow channel.

[0006] According to the above solution, the stop valve core is a cone structure. When the stop valve core moves to the connecting port between the first flow channel and the second flow channel, the stop valve core can block the connecting port and form a metal wire seal.

[0007] According to the above scheme, an end screw sleeve is installed between the protruding part of the valve stem main shaft and the mounting groove, the outside of the end screw sleeve protrudes out of the stop valve body, and a sealing gasket is provided on the inner end face of the end screw sleeve; a friction sealing ring, a lower sealing ring, an upper sealing ring, a pressure plate and a clamping screw sleeve are provided in sequence from the inside to the outside along the axial direction between the end screw sleeve and the valve stem main shaft.

[0008] According to the above scheme, the filling auxiliary valve is a check valve, including a filling valve body, a check valve seat, a check valve core and a check spring, and the interface A and the interface F are both provided on the filling valve body; an inner cavity is provided in the filling valve body, and the inner cavity is divided into an upper inner cavity portion connected to the connecting interface A, and a lower inner cavity portion connected to the interface F; the check valve seat is installed in the upper inner cavity portion, and a flow channel is arranged therein, and the check valve core is installed in the lower inner cavity portion, and the upper end of the check valve core blocks the flow channel of the check valve seat; the lower part of the check valve core is connected to one end of the check spring, and the other end of the check spring is connected to the lower inner cavity portion, and the initial state of the check spring is a compressed state; when the pressure on the interface A side is higher than the pressure on the interface F side, the check valve core is pressed downward, detached from the flow channel of the check valve seat, and the interface A is connected with the interface F; when the pressure on the interface A side is lower than the pressure on the interface F side, the check valve core automatically resets under the action of the check spring, blocks the flow channel of the check valve seat, and the interface A is disconnected from the interface F.

[0009] According to the above scheme, the filling auxiliary valve is also provided with a filtering module, and the filtering assembly includes a filter, a filter clamping spring and a filter clamping screw sleeve; the filter is installed on the upper part of the inner cavity, the lower end outlet of the filter is connected to the upper end of the flow channel of the check valve seat, and the upper end of the filter is equipped with a filter clamping spring and a filter clamping screw sleeve.

[0010] According to the above solution, a valve core sealing gasket is arranged on the stop valve core.

[0011] According to the above scheme, the discharge auxiliary valve includes a discharge valve body, a discharge valve core and a discharge sleeve, and the interface B and the interface G are both opened on the discharge valve body; the upper part of the discharge valve body is provided with a cavity connected with the interface B, and the lower part of the discharge valve body is provided with a discharge channel connected with the cavity and the interface G respectively; the discharge sleeve and the discharge valve core are both installed in the cavity, the upper part of the discharge valve core is connected with the discharge sleeve, and the discharge sleeve drives the discharge valve core to move, blocking or detaching from the upper opening of the discharge channel.

[0012] According to the above scheme, the structures of the main stop valve, charging auxiliary valve and discharge auxiliary valve are all made of copper-nickel alloy material, and the stop valve body is integrally formed by nickel-copper alloy forgings; the charging valve body and the discharge valve body are connected by bolts.

[0013] According to the above scheme, the interface A of the charging auxiliary valve and the interface B of the discharge auxiliary valve are both threaded interfaces, and are respectively provided with sealing protection caps.

[0014] The beneficial effects of the present invention are:

[0015] 1) The valve group of the present invention integrates the three valve blocks of the main stop valve, the charging auxiliary valve and the discharge auxiliary valve into a plug-in integrated design, thereby realizing the functional integration of charging and discharging, being safe to operate and convenient for modular replacement and maintenance.

[0016] 2) The filling auxiliary valve described in the present invention integrates an automatic check valve. During the oxygen filling process, when the upstream filling hose ruptures, burns, or other faults occur, the oxygen passage is automatically cut off, which can effectively avoid the continuation of combustion and the high-pressure oxygen high-speed backflow causing greater harm, and is safe and reliable.

[0017] 3) The copper-nickel alloy material mainly used in the present invention not only has good oxygen compatibility and can withstand the requirements of oxygen filling and discharge under extremely high oxygen pressure, but also has good corrosion resistance for use in marine environments and can work reliably in high temperature, high humidity and high salt marine environments.

[0018] 4) The main stop valve of the valve group described in the present invention is connected between the valve core and the valve stem through a main shaft sleeve. The main shaft sleeve adopts a micro-stroke transmission thread and forms a hinge connection structure with the valve core. When the valve stem rotates, the main shaft sleeve is driven to rotate and rise. The main shaft sleeve drives the valve core to slowly open and close without rotation through the hinge connection. This connection form can avoid the impact of high-pressure oxygen gas path and the friction between the valve core and the valve seat, thereby ensuring the safety and reliability of the valve group and effectively preventing oxygen leakage.

[0019] 5) The valve core of the main stop valve of the valve group of the present invention adopts a cone structure, which forms a metal wire sealing structure with the valve seat when closed, has good sealing performance, and can effectively isolate the high-pressure oxygen stored downstream when closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a specific embodiment of the present invention.

[0021] Figure 2 Schematic diagram of the structure of the main stop valve in this embodiment.

[0022] Figure 3 It is a structural schematic diagram of the filling auxiliary valve in this embodiment.

[0023] Figure 4 It is a schematic diagram of the structure of the discharge auxiliary valve in this embodiment.

[0024] Among them: 1-main stop valve, 2-charging auxiliary valve, 3-discharge auxiliary valve, 4-stop valve body, 5-stop valve core, 6-main shaft sleeve, 7-sealing gasket, 8-valve stem main shaft, 9-friction sealing ring, 10-end screw sleeve, 11-lower sealing ring, 12-upper sealing ring, 13-pressure plate, 14-compression screw sleeve, 15-handle, 16-charging valve body, 17-check valve seat, 18-valve core sealing gasket, 19-check valve core, 20-check spring, 21-check sealing gasket, 22-filter, 23-filter pressing spring, 24-filter pressing screw sleeve, 25-charging plug, 26-discharge valve body, 27-discharge valve core, 28-discharge shaft sleeve, 29-discharge plug, 30-protective shell. DETAILED DESCRIPTION

[0025] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] like Figure 1 A high-pressure oxygen charging and discharging valve group for ships is shown, comprising a main stop valve 1, a charging auxiliary valve 2 and a discharging auxiliary valve 3, wherein the main stop valve 1 is provided with three interfaces C, D and E which can be connected to each other; the charging auxiliary valve 2 is provided with an interface A and an interface F which are connected to each other; the discharging auxiliary valve 3 is provided with an interface B and an interface G which are connected to each other; the interface C of the main stop valve 1 is connected to the downstream high-pressure oxygen system pipeline; the interface D of the main stop valve 1 is connected to the interface F of the charging auxiliary valve 2 through a first pipeline; the interface G of the main stop valve 1 is connected to the interface G of the discharging auxiliary valve 3 through a second pipeline; a protective shell 30 is provided on the outside of the first pipeline and the second pipeline; the interface A of the charging auxiliary valve 2 is a charging port, which can be connected to a high-pressure oxygen charging device; the interface B of the discharging auxiliary valve 3 is a discharging port, which can be connected to a discharging tool.

[0027] In the present invention, the main stop valve 11 is used to control the on-off of the downstream high-pressure oxygen system pipeline connected to its C interface, the filling auxiliary valve 2 realizes the filling function of the valve group, and the discharge auxiliary valve 3 realizes the discharge function of the valve group. When high-pressure oxygen is filled, the interface A of the filling auxiliary valve 2 is connected to the filling hose of the high-pressure oxygen filling equipment, and the main stop valve 1 is opened, and the filling auxiliary valve 2 is connected to the downstream high-pressure oxygen system pipeline to realize the filling function of the valve group; when high-pressure oxygen is discharged, the discharge tool is connected to the interface B of the discharge auxiliary valve 3, and the main stop valve 1 is opened, and the discharge auxiliary valve 3 is connected to the downstream high-pressure oxygen system pipeline to realize the discharge function of the valve group. After the filling and discharge operations are completed, the main stop valve 1 is closed to disconnect the connection with the downstream high-pressure oxygen system pipeline.

[0028] In the present invention, Figure 2 As shown, the main stop valve 1 includes a stop valve body 4, a stop valve core 5, a main shaft sleeve 6, a valve stem main shaft 8 and a handle 15; the interface C, the interface D and the interface E are all opened on the stop valve body 4; the stop valve body 4 is provided with a first flow channel connected to the interface C, a second flow channel connected to the interface D, and a third flow channel connected to the interface E, and the first flow channel, the second flow channel and the third flow channel are connected in sequence; the stop valve body 4 is provided with a mounting groove, and the stop valve core 5 and the valve stem main shaft 8 are both assembled in the mounting groove The end of the stop valve core 5 is hinged with the main shaft sleeve 6, the main shaft sleeve 6 is threadedly connected to one end of the valve stem main shaft 8, and the other end of the valve stem main shaft 8 extends out of the stop valve body 4 and the stop valve cover arranged at the end of the stop valve body 4, and is connected to the external handle 15; when the handle 15 is turned, the valve stem main shaft 8 rotates accordingly, and drives the main shaft sleeve 6 to rotate and rise and fall, and the main shaft sleeve 6 drives the stop valve core 5 to move non-rotatably along the direction of the valve stem main shaft 8 through the hinge connection structure, so that the stop valve core 5 closes or opens the connecting port between the first flow channel and the second flow channel.

[0029] Preferably, the stop valve core 5 is a cone structure. When the stop valve core 5 slowly moves to the connection port between the first flow channel and the second flow channel, the main stop valve 1 is closed. At this time, the stop valve core 5 can block the connection port and form a metal wire seal. After the filling and discharge operations are completed, the operating handle 15 closes the main stop valve 1 to isolate the high-pressure oxygen in the downstream high-pressure oxygen system pipeline.

[0030] Preferably, an end screw sleeve 10 is assembled between the protruding part of the valve stem main shaft 8 and the mounting groove, the outside of the end screw sleeve 10 protrudes out of the stop valve body 4, and a sealing gasket 7 is provided on the inner end face of the end screw sleeve 10; a friction sealing ring 9, a lower sealing ring 11, an upper sealing ring 12, a pressure plate 13 and a clamping screw sleeve 14 are provided in sequence from the inside to the outside along the axial direction between the end screw sleeve 10 and the valve stem main shaft 8.

[0031] In the present invention, Figure 3As shown, the filling auxiliary valve 2 is a check valve, including a filling valve body 16, a check valve seat 17, a check valve core 19 and a check spring 20. The interface A and the interface F are both provided on the filling valve body 16; an inner cavity is provided in the filling valve body 16, and the inner cavity is divided into an upper inner cavity portion connected to the connecting interface A and a lower inner cavity portion connected to the interface F; the check valve seat 17 is installed in the upper inner cavity portion, and a flow channel is provided therein (the flow channel is connected to the upper inner cavity portion), and the check valve core 19 is installed in the lower inner cavity portion, and the upper end of the check valve core 19 blocks the flow channel of the check valve seat 17; the lower part of the check valve core 19 is connected to one end of the check spring 20, and the other end of the check spring 20 is connected to the lower inner cavity portion, and the initial state of the check spring 20 is a compressed state. A valve core sealing gasket 18 is provided on the stop valve core 5. A check sealing gasket 21 is provided at the end of the check valve seat 17. The interface A is a threaded interface, equipped with a filling plug 25, which is a sealing protective cap of the interface A. After filling, tighten the filling plug 25 to prevent the external marine environment from polluting the interface A. When the pressure on the interface A side is higher than the pressure on the interface F side, the check valve core 19 moves downward under pressure, detaches from the flow channel of the check valve seat 17, and the interface A is connected with the interface F; when the pressure on the interface A side is lower than the pressure on the interface F side, the check valve core 19 automatically resets under the action of the check spring 20, blocks the flow channel of the check valve seat 17, and the interface A is disconnected from the interface F, preventing the high-pressure oxygen that has been filled from flowing back.

[0032] Preferably, the filling auxiliary valve 2 is further provided with a filter module, and the filter assembly includes a filter 22, a filter pressing spring 23 and a filter pressing screw sleeve 24; the filter 22 is installed at the upper part of the inner cavity, and the lower end outlet of the filter 22 is connected to the upper end of the flow channel of the check valve seat 17, and the upper end of the filter 22 is equipped with a filter pressing spring 23 and a filter pressing screw sleeve 24. In this embodiment, the filter module filters the particles in the filling gas to prevent the valve group and the downstream oxygen system from being contaminated by particles, resulting in oxygen system accidents.

[0033] In the present invention, Figure 4 The discharge auxiliary valve 3 includes a discharge valve body 26, a discharge valve core 27 and a discharge shaft sleeve 28, and the interface B and the interface G are both opened on the discharge valve body 26; the upper part of the discharge valve body 26 is provided with a cavity connected with the interface B, and the lower part of the discharge valve body 26 is provided with a discharge channel connected with the cavity and the interface G respectively; the discharge shaft sleeve 28 and the discharge valve core 27 are both installed in the cavity, and the upper part of the discharge valve core 27 is connected with the discharge shaft sleeve 28, and the discharge shaft sleeve 28 drives the discharge valve core 27 to move, and blocks or separates from the upper opening of the discharge channel.

[0034] In this embodiment, the discharge valve body 26, the discharge valve core 27 and the discharge shaft sleeve 28 constitute a needle valve without a valve stem structure (this is the prior art and will not be repeated here), the interface G of the discharge auxiliary valve 3 is connected to the interface E of the main stop valve 1 through a pipeline, and the interface B of the discharge auxiliary valve 3 is a threaded interface, that is, a discharge interface; the interface B can be connected to the discharge wrench, and after the connection, the internal transmission rod of the discharge wrench is docked with the card groove on the discharge shaft sleeve 28, and the operating handle of the discharge wrench can be rotated to drive the discharge shaft sleeve 28 to rotate; the discharge shaft sleeve 28 adopts a micro-stroke transmission thread and is hingedly connected to the discharge valve core 27 (a needle valve core). The rotation of the discharge shaft sleeve 28 can drive the discharge valve core 27 to slowly rise and fall, thereby realizing the control of the opening size of the discharge auxiliary valve 3 and opening and closing. The discharge auxiliary valve 3 is opened by a discharge wrench during discharge and is closed in other situations. Immediately after closing, the discharge plug 29 is used to seal and protect the interface B of the discharge auxiliary valve 3 to prevent contamination of the external marine environment interface A.

[0035] In this embodiment, an oil-free label is installed on the stop valve body 4 of the main stop valve 1 by rivets, and the opening rotation direction is marked on the handle 15; the stop valve body 4 of the main stop valve 1 is integrally formed by forging of nickel-copper alloy material. The filling valve body 16 and the discharge valve body 26 are connected by bolts. The interface A of the filling auxiliary valve 2 and the interface B of the discharge auxiliary valve 3 are both threaded interfaces, and are respectively provided with sealing protection caps. After filling or discharging is completed, the sealing protection caps are tightened to prevent contamination of the interface from the external marine environment. The structures of the main stop valve 1, the filling auxiliary valve 2, and the discharge auxiliary valve 3 are mainly made of copper-nickel alloy materials, and the gas flow channel and the sealing structure have good oxygen compatibility and corrosion resistance.

[0036] Finally, it should be noted that the above are only preferred embodiments of the present patent and are not intended to limit the present patent. Although the patent is described in detail with reference to the embodiments, technicians in this field can still modify the technical solutions recorded in the aforementioned embodiments or replace some of the technical features therein with equivalents. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the patent.

Claims

1. A high-pressure oxygen charging and discharging valve group for ships, characterized in that: It includes a main stop valve, a charging auxiliary valve and a discharge auxiliary valve, wherein the main stop valve is provided with three interfaces C, D and E which are interconnected; the charging auxiliary valve is provided with an interface A and an interface F which are interconnected; the discharge auxiliary valve is provided with an interface B and an interface G which are interconnected; the interface C of the main stop valve is connected to the downstream high-pressure oxygen system pipeline; the interface D of the main stop valve is connected to the interface F of the charging auxiliary valve through a first pipeline; the interface G of the main stop valve is connected to the interface G of the discharge auxiliary valve through a second pipeline; a protective shell is provided on the outside of the first pipeline and the second pipeline; the interface A of the charging auxiliary valve is a charging port; the interface B of the discharge auxiliary valve is a discharge port; when high-pressure oxygen is charged, the interface A of the charging auxiliary valve is connected to the high-pressure oxygen charging equipment, the main stop valve is opened, and the charging auxiliary valve is connected to the downstream high-pressure oxygen system pipeline; when high-pressure oxygen is discharged, the discharge tool is connected to the interface B of the discharge auxiliary valve, the main stop valve is opened, and the discharge auxiliary valve is connected to the downstream high-pressure oxygen system pipeline; The main stop valve comprises a stop valve body, a stop valve core, a main shaft sleeve, a valve stem main shaft and a handle; the interface C, the interface D and the interface E are all provided on the stop valve body; the stop valve body is provided with a first flow channel connected to the interface C, a second flow channel connected to the interface D, and a third flow channel connected to the interface E, and the first flow channel, the second flow channel and the third flow channel are connected in sequence; the stop valve body is provided with a mounting groove, the stop valve core and the valve stem main shaft are both assembled in the mounting groove, the end of the stop valve core is hinged with the main shaft sleeve, the main shaft sleeve is threadedly connected to one end of the valve stem main shaft, and the other end of the valve stem main shaft is connected to the external handle after extending out of the stop valve body and the stop valve cover; when the handle is turned, the valve stem main shaft rotates accordingly, and drives the main shaft sleeve to rotate and rise and fall, and the main shaft sleeve drives the stop valve core to move non-rotatably along the direction of the valve stem main shaft through the hinge connection structure, so that the stop valve core closes or opens the connecting port between the first flow channel and the second flow channel; The filling auxiliary valve is a check valve, including a filling valve body, a check valve seat, a check valve core and a check spring, and the interface A and the interface F are both provided on the filling valve body; an inner cavity is provided in the filling valve body, and the inner cavity is divided into an upper inner cavity portion connected to the connecting interface A, and a lower inner cavity portion connected to the interface F; the check valve seat is installed in the upper inner cavity portion, and a flow channel is arranged therein, and the check valve core is installed in the lower inner cavity portion, and the upper end of the check valve core blocks the flow channel of the check valve seat; the lower portion of the check valve core is connected to one end of the check spring, and the other end of the check spring is connected to the lower inner cavity portion, and the initial state of the check spring is a compressed state; when the pressure on the interface A side is higher than the pressure on the interface F side, the check valve core is pressed downward and disengaged from the flow channel of the check valve seat, and the interface A is connected with the interface F; when the pressure on the interface A side is lower than the pressure on the interface F side, the check valve core automatically resets under the action of the check spring, blocks the flow channel of the check valve seat, and the interface A is disconnected from the interface F; The discharge auxiliary valve includes a discharge valve body, a discharge valve core and a discharge shaft sleeve, and the interface B and the interface G are both opened on the discharge valve body; the upper part of the discharge valve body is provided with a cavity connected with the interface B, and the lower part of the discharge valve body is provided with a discharge channel connected with the cavity and the interface G respectively; the discharge shaft sleeve and the discharge valve core are both installed in the cavity, the upper part of the discharge valve core is connected with the discharge shaft sleeve, and the discharge shaft sleeve drives the discharge valve core to move, and blocks or separates from the upper opening of the discharge channel.

2. The high-pressure oxygen charging and discharging valve group for ships according to claim 1, characterized in that: The stop valve core is a cone structure. When the stop valve core moves to the communication port between the first flow channel and the second flow channel, the stop valve core blocks the communication port and forms a metal wire seal.

3. The high-pressure oxygen charging and discharging valve group for ships according to claim 1 is characterized in that: An end screw sleeve is assembled between the protruding part of the valve stem main shaft and the mounting groove, the outer part of the end screw sleeve protrudes out of the stop valve body, and a sealing gasket is provided on the inner end face of the end screw sleeve; a friction sealing ring, a lower sealing ring, an upper sealing ring, a pressure plate and a clamping screw sleeve are provided in sequence from inside to outside along the axial direction between the end screw sleeve and the valve stem main shaft.

4. The high-pressure oxygen charging and discharging valve group for ships according to claim 1, characterized in that: The filling auxiliary valve is also provided with a filter module, and the filter assembly includes a filter, a filter clamping spring and a filter clamping screw sleeve; the filter is installed on the upper part of the inner cavity, the lower end outlet of the filter is connected to the upper end of the flow channel of the check valve seat, and the upper end of the filter is equipped with a filter clamping spring and a filter clamping screw sleeve.

5. The high-pressure oxygen charging and discharging valve group for ships according to claim 1, characterized in that: The stop valve core is provided with a valve core sealing gasket.

6. The high-pressure oxygen charging and discharging valve group for ships according to claim 1, characterized in that: The structures of the main stop valve, charging auxiliary valve and discharge auxiliary valve are all made of copper-nickel alloy material, and the stop valve body is integrally formed by nickel-copper alloy forgings; the charging valve body and the discharge valve body are connected by bolts.

7. The high-pressure oxygen charging and discharging valve group for ships according to claim 1, characterized in that: The interface A of the charging auxiliary valve and the interface B of the discharging auxiliary valve are both threaded interfaces, and are respectively provided with sealing protection caps.

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