Two-stage reverse type non-unloading high-pressure oxygen pressure reducing valve

Abstract

A two-stage reverse type non-unloading high-pressure oxygen pressure reducing valve, comprising: a primary pressure reducing valve and a secondary pressure reducing valve; the outlet of the primary pressure reducing valve and the inlet of the secondary pressure reducing valve are communicated to form a gas flow channel; a valve core structure is arranged in the primary pressure reducing valve and the secondary pressure reducing valve; the valve core structure comprises a primary valve and a secondary valve which are used in cooperation to control the gas pressure in the gas flow channel; the primary valve is installed at the inlet of the primary pressure reducing valve; and the secondary valve is installed at the inlet of the secondary pressure reducing valve. The device product adopts a two-stage reverse type non-unloading pressure reducing structure design, which is compact and simple, can fully utilize the force of the gas pressure at the inlet of the primary pressure reducing valve and the force of the gas pressure at the outlet of the secondary pressure reducing valve as the sealing force of the valve, realizes the good cutoff function of the primary valve and the secondary valve in the zero-flow working state, and at the same time, the output pressure of the gas can be stabilized after the secondary pressure reducing, and the output pressure precision of the product is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas pressure reducing valve, and particularly relates to a two-stage reverse type non-unloading high-pressure oxygen pressure reducing valve. BACKGROUND

[0002] In the field of aerospace, high-pressure oxygen source is still one of the necessary resources, which needs to be reduced to a specified pressure by a reliable and stable pressure reducing device. At present, the oxygen pressure reducing valve is mostly of single-stage structure, and the device itself is difficult to meet the reliability design requirements.

[0003] The high-pressure oxygen source is mainly used for realizing the functions of aircraft cabin pressure maintaining and crew breathing in the field of aerospace. The pressure reducing valve, as a pure mechanical device, can reduce the high-pressure oxygen source to a specific pressure for the downstream gas pipeline system, and is not affected by energy problems in harsh environments, and is an essential important component when using high-pressure oxygen source. Since the chemical and physical properties of high-pressure oxygen source are extremely active, the reliability and safety of the pressure reducing valve are required to be high, and redundancy design is needed. At present, the high-pressure gas pressure reducing valve is mostly of single-stage structure, and only a few two-stage pressure reducing valves are just a combination of two identical single-stage pressure reducing mechanisms. The high-pressure gas is reduced to medium pressure by the first-stage pressure reducing valve, and then enters the second-stage pressure reducing valve through the orifice plate between the two valves, and is reduced to a specific pressure.

[0004] The current single-stage gas pressure reducing valve has the disadvantage that redundancy design is not performed. When the sealing performance of the valve is reduced, irreversible failure modes such as pressure reducing function failure may occur during use. If the pressure bearing capacity of the downstream gas pipeline is weak, there may be a safety hazard of large-area leakage or even explosion of the entire pipeline.

[0005] The current two-stage gas pressure reducing valve has the disadvantage that the high-pressure oxygen source is not adaptively designed. The high-pressure oxygen source has the characteristics of being easily explosive and combustible, and is essentially different from high-pressure nitrogen, air and helium. Therefore, the generation of excess substances should be minimized.

[0006] Therefore, the current market pressure reducing valves either lack redundancy design or lack adaptability design for oxygen source, and cannot meet the high reliability and high safety design requirements of high-pressure oxygen source pressure reducing valves in the field of aerospace. From the system point of view, only multiple single-stage pressure reducing valves can be connected and combined, which is contrary to the overall lightweight design. SUMMARY

[0007] In order to solve the problem that the existing pressure reducing valve cannot meet the high reliability and high safety design requirements of high-pressure oxygen source pressure reducing valves in the field of aerospace, the present application provides a two-stage reverse type non-unloading high-pressure oxygen pressure reducing valve, which comprises a first-stage pressure reducing valve and a second-stage pressure reducing valve.

[0008] The outlet of the primary pressure reducing valve and the inlet of the secondary pressure reducing valve are communicated to form a gas flow channel;

[0009] The primary pressure reducing valve and the secondary pressure reducing valve are provided with a valve core structure;

[0010] The valve core structure comprises a primary valve and a secondary valve which are used in cooperation to control the gas pressure in the gas flow channel;

[0011] The primary valve is installed at the inlet of the primary pressure reducing valve;

[0012] The secondary valve is installed at the inlet of the secondary pressure reducing valve.

[0013] Preferably, the primary pressure reducing valve comprises a primary valve body assembly;

[0014] The valve core structure of the primary pressure reducing valve is installed in the primary valve body assembly and comprises a primary pressure regulating assembly, a primary valve seat and a primary valve core assembly arranged in sequence;

[0015] The primary valve core assembly and the primary valve seat are both installed in the gas flow channel along the gas flow direction;

[0016] The end of the primary pressure regulating assembly passes through the primary valve seat towards the primary valve core assembly;

[0017] The end of the primary pressure regulating assembly is covered by the primary valve seat, and the end of the primary pressure regulating assembly elastically abuts against the primary valve core assembly.

[0018] Preferably, the primary pressure regulating assembly comprises a primary pressure regulating main body, a primary guide rod and a primary inlet steel ball which are fixedly connected in sequence;

[0019] The primary pressure regulating main body is installed in the primary valve body assembly;

[0020] A primary through hole is formed in the primary valve seat;

[0021] The primary guide rod is arranged in the primary through hole;

[0022] The diameter of the primary inlet steel ball is greater than the inner diameter of the primary through hole, and the primary inlet steel ball is located at the end of the primary through hole towards the primary valve core assembly;

[0023] The primary inlet steel ball elastically abuts against the primary valve core assembly.

[0024] Preferably, the primary valve core assembly comprises a primary inlet spring in a contracted state;

[0025] The primary inlet spring is arranged along the flow direction of the gas in the gas flow channel;

[0026] One end of the primary inlet spring is mounted in the primary valve body assembly, and the other end elastically abuts against the primary inlet steel ball.

[0027] Preferably, the primary spool assembly further comprises a cylindrical primary inlet guide seat;

[0028] The primary inlet guide seat is arranged along the flow direction of the gas in the gas flow passage;

[0029] The primary inlet guide seat elastically abuts against the primary inlet spring, and the other end abuts against the primary inlet steel ball.

[0030] Preferably, the secondary pressure reducing valve comprises a secondary valve body assembly;

[0031] The spool structure of the secondary pressure reducing valve is mounted in the secondary valve body assembly, and comprises a secondary pressure regulating assembly, a secondary valve seat and a secondary spool assembly arranged in sequence;

[0032] The secondary valve seat and the secondary spool assembly are both mounted in the gas flow passage along the gas flow direction;

[0033] The end of the secondary pressure regulating assembly towards the secondary spool assembly passes through the secondary valve seat;

[0034] The end of the secondary pressure regulating assembly is covered by the secondary valve seat, and the end of the secondary pressure regulating assembly elastically abuts against the secondary spool assembly.

[0035] Preferably, the secondary pressure regulating assembly comprises a secondary pressure regulating body, a secondary guide rod and a secondary inlet steel ball fixedly connected in sequence;

[0036] The secondary pressure regulating body is mounted in the secondary valve body assembly;

[0037] The secondary valve seat is provided with a secondary through hole;

[0038] The secondary guide rod passes through the secondary through hole;

[0039] The diameter of the secondary inlet steel ball is greater than the inner diameter of the secondary through hole, and the secondary inlet steel ball is located at the end of the secondary through hole towards the secondary spool assembly;

[0040] The secondary inlet steel ball elastically abuts against the secondary spool assembly.

[0041] Preferably, the secondary spool assembly comprises a secondary inlet spring in a contracted state;

[0042] The secondary inlet spring is arranged along the flow direction of the gas in the gas flow passage;

[0043] One end of the secondary inlet spring is installed inside the secondary valve body assembly, and the other end elastically abuts against the secondary inlet steel ball.

[0044] Preferably, the secondary valve core assembly further includes a secondary inlet guide seat with a columnar structure;

[0045] The secondary inlet guide seat is arranged along the gas flow direction in the gas flow channel;

[0046] The secondary inlet guide seat is elastically abutted against the secondary inlet spring, and the other end abuts against the secondary inlet steel ball.

[0047] Preferably, the secondary valve body assembly is further provided with a damping structure;

[0048] The damping structure is arranged along the direction of movement of the secondary inlet steel ball;

[0049] The damping structure is located at the end of the secondary voltage regulating body away from the secondary guide rod and is elastically connected to the secondary voltage regulating body.

[0050] Preferably, a filter structure is installed at the inlet of the primary pressure reducing valve.

[0051] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0052] This invention provides a two-stage reverse non-unloading high-pressure oxygen pressure reducing valve, comprising: a primary pressure reducing valve and a secondary pressure reducing valve; the outlet of the primary pressure reducing valve and the inlet of the secondary pressure reducing valve are connected to form a gas flow channel; valve core structures are provided inside the primary and secondary pressure reducing valves; the valve core structure includes a primary valve and a secondary valve that cooperate with each other to control the gas pressure in the gas flow channel; the primary valve is installed at the inlet of the primary pressure reducing valve; the secondary valve is installed at the inlet of the secondary pressure reducing valve. The device provided by this invention adopts a two-stage reverse non-unloading pressure reducing structure design, which is compact and simple. It can fully utilize the force of the gas pressure at the inlet of the primary pressure reducing valve and the force of the gas pressure at the outlet of the secondary pressure reducing valve as the sealing force of the valves, achieving good shut-off function of the primary and secondary valves under zero-flow operating conditions; at the same time, the gas output pressure can achieve high stability after secondary pressure reduction, improving the output pressure accuracy of the product. Attached Figure Description

[0053] Figure 1 This is a longitudinal sectional view of the two-stage reverse non-unloading high-pressure oxygen pressure reducing valve of the present invention.

[0054] The components are as follows: 1. Inlet connector; 2. Primary inlet spring; 3. Primary inlet guide seat; 4. Primary inlet steel ball; 5. Primary valve seat; 6. Primary valve seat pressure block; 7. Piston; 8. Valve body; 9. Primary pressure regulating spring; 10. Primary top cover; 11. Primary spring seat; 12. Rotating steel ball; 13. Primary pressure regulating stud; 14. Plug; 15. Secondary inlet spring; 16. Secondary inlet guide seat; 17. Secondary inlet steel ball; 18. Secondary valve seat; 19. Secondary guide rod; 20. Secondary valve seat pressure block; 21. Filter screen; 22. Outlet connector; 23. Gasket; 24. Diaphragm; 25. Secondary spring seat; 26. Diaphragm pressure block; 27. Secondary pressure regulating spring; 28. Secondary top cover; 29. ​​Secondary pressure regulating stud; 30. Filter structure; 31. Damping structure. Detailed Implementation

[0055] To better understand this invention, the following description, in conjunction with the accompanying drawings and examples, will further illustrate the invention.

[0056] This invention provides a two-stage reverse non-unloading high-pressure oxygen pressure reducing valve. It adopts a two-stage reverse non-unloading pressure reducing structure design, which is compact and simple. It can make full use of the inlet gas pressure of the first-stage pressure reducing valve and the outlet gas pressure of the second-stage pressure reducing valve as the sealing force of the valve, so as to achieve good shut-off function of the first-stage valve and the second-stage valve under zero flow operation. At the same time, the output pressure of the gas can achieve high stability after the second-stage pressure reduction, which improves the output pressure accuracy of the product.

[0057] Example:

[0058] A two-stage reverse non-unloading high-pressure oxygen pressure reducing valve, such as Figure 1 As shown, it includes: a primary pressure reducing valve and a secondary pressure reducing valve; the primary pressure reducing valve is installed in the correct direction, and the secondary pressure reducing valve is installed in the reverse direction; the outlet of the primary pressure reducing valve and the inlet of the secondary pressure reducing valve are connected to form a gas flow channel; the primary and secondary pressure reducing valves are equipped with valve core structures; the valve core structure includes a primary valve and a secondary valve that work together to control the gas pressure in the gas flow channel; the primary valve is installed at the inlet of the primary pressure reducing valve; the secondary valve is installed at the inlet of the secondary pressure reducing valve.

[0059] The pressure reducing valve provided in this embodiment is suitable for gases with inlet pressures in the range of 2-35 MPa, and has a stable outlet pressure.

[0060] The primary pressure reducing valve comprises a primary valve body assembly; a valve core structure of the primary pressure reducing valve is installed in the primary valve body assembly, and comprises: a primary pressure regulating assembly, a primary valve seat 5 and a primary valve core assembly arranged in sequence; the primary valve core assembly and the primary valve seat 5 are both installed in a gas flow passage along a gas flow direction; an end of the primary pressure regulating assembly towards the primary valve core assembly penetrates through the primary valve seat 5; an end of the primary pressure regulating assembly is covered by the primary valve seat 5, and the end of the primary pressure regulating assembly elastically abuts against the primary valve core assembly.

[0061] The primary pressure regulating assembly comprises a primary pressure regulating main body, a primary guide rod and a primary inlet steel ball 4 fixedly connected in sequence; the primary pressure regulating main body is installed in the primary valve body assembly; the primary valve seat 5 is provided with a primary through hole; the primary guide rod penetrates through the primary through hole; the diameter of the primary inlet steel ball 4 is greater than the inner diameter of the primary through hole, and the primary inlet steel ball 4 is located at an end of the primary through hole towards the primary valve core assembly; the primary inlet steel ball 4 elastically abuts against the primary valve core assembly.

[0062] In the embodiment, the main body of the pressure reducing valve is a valve body 8, the valve body 8 comprises a primary pressure reducing valve body 8 and a secondary pressure reducing valve body 8 both arranged along a vertical direction, the primary pressure reducing valve body 8 and the secondary pressure reducing valve body 8 are both columnar structures and are both provided with a gas flow passage inside; the opening and the outlet of the primary pressure reducing valve are both arranged at a lower end of the primary pressure reducing valve body 8 and are communicated through the gas flow passage inside the primary pressure reducing valve body 8; the gas flow passage inside the primary pressure reducing valve body 8 comprises two horizontal gas flow passages and one vertical gas flow passage, the two horizontal gas flow passages are respectively located at two ends of the vertical gas flow passage, and the opening and the outlet of the primary pressure reducing valve are respectively located at ends of the vertical gas flow passage far away from the two horizontal gas flow passages.

[0063] The primary pressure reducing valve body 8 is coaxially provided with a primary pressure regulating accommodating cavity in the vertical direction gas flow channel, and a primary pressure regulating body is installed in the primary pressure regulating accommodating cavity; in this embodiment, the primary pressure regulating accommodating cavity is communicated with the gas flow channel inside the primary pressure reducing valve. The primary pressure regulating body includes a primary pressure regulating stud 13, a rotating steel ball 12, a primary spring seat 11, a primary pressure regulating spring 9, a piston 7, a primary valve seat pressing block 6, a primary valve seat 5 and a primary inlet steel ball 4, which are sequentially arranged from top to bottom. The primary pressure regulating stud 13 is a rotatable handle and is threadedly connected with the primary pressure reducing valve body 8. In order to reduce the friction between the primary spring seat 11 and the primary pressure regulating stud 13, the rotating steel ball 12 is arranged, which is a spherical body and is pressed between the primary spring seat 11 and the primary pressure regulating stud 13. With the threaded transmission of the primary pressure regulating stud 13 and the primary pressure reducing valve body 8, the primary spring seat 11 only receives the axial thrust transmitted by the primary pressure regulating stud 13 through the rotating steel ball 12, and is not subjected to the friction transmitted by the primary pressure regulating stud 13. The piston 7 is slidably installed in the primary pressure regulating accommodating cavity and is fixedly connected with the primary guide rod at the lower end. The upper end of the primary pressure regulating spring 9 is installed on the primary spring seat 11, and the lower end is in abutment with the piston 7 to provide elastic force for the piston 7. In this embodiment, the piston 7 is a T-shaped block, the lower end small diameter rod end is fixedly connected with the primary guide rod in a coaxial manner, and the primary pressure regulating spring 9 is always in a compressed state. The primary valve seat pressing block 6 and the primary valve seat 5 are both annular structures and are installed in the primary pressure regulating accommodating cavity, and the primary valve seat pressing block 6 is fixedly connected with the primary pressure reducing valve body 8, and the lower end of the primary valve seat pressing block 6 is pressed against the upper surface of the primary valve seat 5. A through hole is formed in the primary valve seat pressing block 6, and the lower part of the piston 7 is arranged in the through hole of the primary valve seat pressing block 6. A through hole is also formed in the primary valve seat 5, and the primary guide rod is arranged in the through hole of the primary valve seat 5, and the lower part of the primary guide rod is fixedly connected with the primary inlet steel ball 4. The diameter of the primary inlet steel ball 4 is greater than the inner diameter of the through hole of the primary valve seat 5, and the center of the primary inlet steel ball 4 is collinear with the axis of the through hole of the primary valve seat 5. In order to increase the service life of the equipment and the convenience during use, a primary upper cover 10 is further arranged on the primary pressure reducing valve body 8, which is an annular structure, is sleeved outside the primary pressure regulating stud 13, the rotating steel ball 12, the primary spring seat 11 and the primary pressure regulating spring 9, is threadedly connected with the primary pressure reducing valve body 8, and the primary pressure regulating stud 13 is threadedly connected with the primary upper cover 10. In this embodiment, the gas flow channel in the primary pressure reducing valve includes the through hole in the primary valve seat 5.

[0064] In order to prevent the lower end of the piston 7 from abutting against the primary valve seat 5, causing the gas flow passage in the primary pressure reducing valve to be blocked, a primary valve core assembly is provided in the device. The primary valve core assembly includes a primary inlet spring 2 in a contracted state; the primary inlet spring 2 is arranged along the flow direction of the gas in the gas flow passage; one end of the primary inlet spring 2 is installed in the primary valve body assembly, and the other end is in elastic abutment with the primary inlet steel ball 4.

[0065] The primary valve core assembly also includes a primary inlet guide seat 3 in a columnar structure; the primary inlet guide seat 3 is arranged along the flow direction of the gas in the gas flow passage; the primary inlet guide seat 3 is in elastic abutment with the primary inlet spring 2, and the other end is in abutment with the primary inlet steel ball 4.

[0066] In this embodiment, the primary inlet guide seat 3 and the primary inlet spring 2 are coaxially arranged from top to bottom, and when not in use, the primary inlet steel ball 4 is in abutment with the upper end of the primary inlet guide seat 3; the lower end of the primary inlet spring 2 is fixedly connected to the gas flow passage in the primary pressure reducing valve. The upper end of the primary inlet guide seat 3 is provided with a groove, and when the primary inlet steel ball 4 is in abutment with the groove of the primary inlet guide seat 3, the primary inlet steel ball 4 has a spacing with the bottom wall of the groove of the primary inlet guide seat 3. In order to increase the flow of gas, the groove of the primary inlet guide seat 3 is square, and the primary inlet steel ball 4 is in abutment or not in abutment with the primary inlet guide seat 3. The gas from the outside can enter between the primary inlet guide seat 3 and the primary valve seat 5 through the primary inlet guide seat 3. The primary pressure reducing valve balances the pressure reduction by the piston 7 and drives the primary inlet steel ball to move, has a small volume, bears a large pressure, and allows a large stroke of the piston 7.

[0067] An inlet connector 1 is installed at the inlet of the primary pressure reducing valve, the inlet connector 1 is in a circular ring structure, and is threadedly connected to the inlet of the primary pressure reducing valve. The end of the inlet connector 1 towards the valve body 8 of the primary pressure reducing valve is provided with a filtering structure 30, the filtering structure 30 is a cylindrical bushing, and the periphery is provided with a plurality of circular holes, effectively increasing the effective diameter range of the gas, so that the effective diameter of the gas flow meets the use requirements; at the same time, a double-layer designed filter screen 21 is welded along the outer periphery of the bushing, the outer layer is a coarse filter with a pore size of 15μm-40μm, and the inner layer is a fine filter with a pore size of 5μm-10μm. The filtering structure 30 blocks the excess in the gas flow, ensures the sealing effect of the valve and the valve seat, and ensures that the product is not accidentally contaminated. In order to facilitate the debugging of the equipment, a plug 14 is provided at the outlet of the primary pressure reducing valve, and the plug 14 is threadedly connected to the outlet of the primary pressure reducing valve. During the equipment assembly and debugging process, the plug 14 is replaced with a conversion connector for connecting a pressure measuring device to test the primary pressure reducing pressure, and after the product test is completed, the process hole is plugged with the plug 14.

[0068] The secondary pressure reducing valve comprises a secondary valve body assembly; a valve core structure of the secondary pressure reducing valve is installed in the secondary valve body assembly, and comprises a secondary pressure regulating assembly, a secondary valve seat 18 and a secondary valve core assembly arranged in sequence; the secondary valve core assembly and the secondary valve seat 18 are both installed in a gas flow passage along a gas flow direction; an end of the secondary pressure regulating assembly passes through the secondary valve seat 18 towards the secondary valve core assembly; an end cover of the secondary pressure regulating assembly is arranged on the secondary valve seat 18, and the end of the secondary pressure regulating assembly is in elastic abutment with the secondary valve core assembly.

[0069] The secondary pressure regulating assembly comprises a secondary pressure regulating main body, a secondary guide rod 19 and a secondary inlet steel ball 17 fixedly connected in sequence; the secondary pressure regulating main body is installed in the secondary valve body assembly; a secondary through hole is arranged on the secondary valve seat 18; the secondary guide rod 19 is arranged in the secondary through hole; the diameter of the secondary inlet steel ball 17 is greater than the inner diameter of the secondary through hole, and the secondary inlet steel ball 17 is arranged at an end of the secondary through hole towards the secondary valve core assembly; the secondary inlet steel ball 17 is in elastic abutment with the secondary valve core assembly.

[0070] In the embodiment, the opening and the outlet of the secondary pressure reducing valve are both arranged at the upper end of the secondary pressure reducing valve body 8 and are communicated through a gas flow passage in the secondary pressure reducing valve body 8; the gas flow passage in the secondary pressure reducing valve body 8 is L-shaped, comprising a vertical gas flow passage and a horizontal gas flow passage; the opening of the secondary pressure reducing valve is arranged at the upper end of the vertical gas flow passage and is communicated with the gas flow passage in the primary pressure reducing valve; and the outlet is arranged at the end of the horizontal gas flow passage away from the vertical gas flow passage.

[0071] The secondary pressure reducing valve body 8 is coaxially provided with a secondary pressure regulating cavity in the gas flow passage in the vertical direction, and a secondary pressure regulating body is installed in the secondary pressure regulating cavity. In this embodiment, the secondary pressure regulating cavity is in communication with the gas flow passage inside the secondary pressure reducing valve. The secondary pressure regulating body includes a secondary pressure regulating stud 29, a secondary pressure regulating spring 27, a secondary spring seat 25, a diaphragm 24, a gasket 23, a secondary valve seat pressing block 20, a secondary guide rod 19, a secondary valve seat 18, and a secondary inlet steel ball 17, which are sequentially arranged from bottom to top. The secondary pressure regulating stud 29 is threadedly connected with the secondary pressure reducing valve body 8, and the upper end of the secondary pressure regulating stud 29 abuts against the lower end of the secondary pressure regulating spring 27. The secondary spring seat 25 has a T-shaped structure, including a horizontal direction stepped circular plate and a vertical direction vertical rod, the vertical rod is arranged in the secondary pressure regulating spring 27, the lower surface of the circular plate abuts against the upper end of the secondary pressure regulating spring 27, the gasket 23 and the diaphragm 24 are both circular soft pads, the upper surface of the circular plate abuts against the lower surface of the diaphragm 24, the secondary valve seat 18 and the secondary valve seat pressing block 20 are both provided with vertical direction through holes, the secondary guide rod 19 is arranged in the vertical direction, and the secondary guide rod 19 is arranged in the through holes of the secondary valve seat 18 and the secondary valve seat pressing block 20, the lower end of the secondary guide rod 19 abuts against the gasket 23, and the upper end is fixedly connected with the secondary inlet steel ball 17. In this embodiment, the diameter of the upper end of the secondary inlet steel ball 17 is smaller than the inner diameter of the through hole of the secondary valve seat 18, and the lower end is matched with the vertical direction through hole on the secondary valve seat pressing block 20. The secondary valve seat pressing block 20 is also provided with a horizontal direction through hole, the vertical direction through hole and the horizontal direction through hole on the secondary valve seat pressing block 20 are in communication, and the gas flow passage in the secondary pressure reducing valve includes the through hole on the secondary valve seat 18, the vertical direction through hole and the horizontal direction through hole on the secondary valve seat pressing block 20. The inner diameter of the through hole on the secondary valve seat 18 is smaller than the diameter of the secondary inlet steel ball 17, and the through hole on the secondary valve seat 18 is a cylindrical through hole, the axis of the through hole on the secondary valve seat 18 is collinear with the center of the secondary inlet steel ball 17. The secondary pressure reducing valve uses the diaphragm 24 as a sensitive element, has high sensitivity, small stroke, and can obtain high output pressure accuracy

[0072] In order to increase the service life of the equipment and the convenience during use, the secondary pressure reducing valve is further sequentially provided with a diaphragm pressing block 26 and a secondary upper cover 28 from top to bottom, the diaphragm pressing block 26 and the secondary upper cover 28 are both annular structures, the diaphragm pressing block 26 is sleeved on the circular plate of the secondary spring seat 25, the secondary upper cover 28 is sleeved outside the secondary pressure regulating stud 29 and the secondary pressure regulating spring 27, the secondary upper cover 28 extends into the secondary pressure regulating cavity, and is threadedly connected with the secondary pressure reducing valve body 8, and the upper end of the secondary upper cover 28 abuts against the lower surface of the diaphragm 24.

[0073] In order to prevent the secondary inlet steel ball 17 from blocking the gas flow channel in the secondary pressure reducing valve, a secondary valve core assembly is arranged in the device. The secondary valve core assembly comprises a secondary inlet spring 15 in a contracted state; the secondary inlet spring 15 is arranged along the flow direction of the gas in the gas flow channel; one end of the secondary inlet spring 15 is installed in the secondary valve body assembly, and the other end is in elastic abutment with the secondary inlet steel ball 17.

[0074] The secondary valve core assembly further comprises a cylindrical secondary inlet guide seat 16; the secondary inlet guide seat 16 is arranged along the flow direction of the gas in the gas flow channel; the secondary inlet guide seat 16 is in elastic abutment with the secondary inlet spring 15, and the other end is in abutment with the secondary inlet steel ball 17.

[0075] In the embodiment, the secondary inlet guide seat 16 and the secondary inlet spring 15 are coaxially arranged from bottom to top, and when not in use, the secondary inlet steel ball 17 is in abutment with the lower end of the secondary inlet guide seat 16; the upper end of the secondary inlet spring 15 is fixedly connected to the gas flow channel in the secondary pressure reducing valve. The lower end of the secondary inlet guide seat 16 is provided with a groove, and when the secondary inlet steel ball 17 is in abutment with the groove of the secondary inlet guide seat 16, the secondary inlet steel ball 17 has a spacing with the bottom wall of the groove of the secondary inlet guide seat 16. In order to increase the flow of the gas, the groove of the secondary inlet guide seat 16 is square, and the secondary inlet steel ball 17 is in abutment or not in abutment with the secondary inlet guide seat 16. The gas from the outside can enter between the secondary inlet guide seat 16 and the secondary inlet steel ball 17.

[0076] The secondary valve body assembly is further provided with a damping structure 31; the damping structure 31 is arranged along the movement direction of the secondary inlet steel ball 17; the damping structure 31 is arranged at the end of the secondary pressure regulating main body away from the secondary guide rod 19, and is elastically connected with the secondary pressure regulating main body.

[0077] In the embodiment, the damping structure 31 is sleeved on the vertical rod of the secondary spring seat 25 and is installed in the secondary pressure regulating stud 29. The damping structure 31 is a spring seat that moves with the sensitive element and a four-fluorine sleeve that is sleeved on the outer side of the spring seat shaft diameter. The sleeve can change the size of the hole diameter under the action of the spring force, so as to adjust the damping force of the movement device, so that the product not only maintains the high sensitivity of the output pressure, but also improves the high stability of the output pressure. At the same time, it can also effectively avoid abnormal sound such as whistling of the product, and improve the life reliability of the equipment.

[0078] The outlet of the secondary pressure reducing valve is provided with an outlet connector 22, and a filter screen 21 is installed in the outlet connector 22 to block the excess in the gas flow, so as to protect the sealing function of the valve and the valve seat and prevent the product from being accidentally contaminated.

[0079] The valve body 8 of the pressure reducing valve provided by the embodiment is made of lead brass material, which has high compatibility with oxygen, and improves the use safety and reliability of the equipment. The outlet of the secondary pressure reducing valve is connected to the equipment for testing pressure and flow, which is used for testing the output pressure and flow of the secondary output gas.

[0080] The product adopts a two-stage reverse non-unloading pressure reducing structure design, which is compact and simple, fully utilizes the force of the inlet pressure as the sealing force of the valve, realizes good cutoff function of the valve in zero flow working state, and reduces the load of the pressure regulating spring; meanwhile, the output pressure can be highly stable after two-stage pressure reduction, which improves the output pressure precision of the product.

[0081] The pressure reducing valve adjusts the opening amount of the primary valve seat 5 and the primary valve seat pressure block 6, the secondary inlet ball and the secondary valve seat 18 of the product by adjusting the pre-tightening force of the pressure regulating spring, to adjust the output pressure of the product. When the product is not assembled with the pressure regulating stud, the primary pressure regulating spring 9 is not compressed and is in a free state, at this time, the primary inlet spring 2 assembled afterwards is in a compressed state, the primary inlet ball is pushed by the primary inlet spring 2 to make the primary inlet ball contact with the primary valve seat 5 and be in a sealed state, the communication between the inlet and the gas flow channel is cut off, and the gas cannot flow. The secondary pressure regulating spring 27 is not compressed and is in a free state, at this time, the secondary inlet spring assembled afterwards is in a compressed state, the secondary inlet ball is pushed by the secondary inlet guide seat to make the secondary inlet ball contact with the secondary valve seat 18 and be in a sealed state, the communication between the inlet and the gas flow channel is cut off, and the gas cannot flow. In the embodiment, the primary inlet spring 2, the primary inlet guide seat 3, the primary inlet ball, and the primary valve seat 5 are provided as a primary valve, the primary inlet ball and the primary valve seat 5 are sealed and connected as a primary valve port closed, the primary inlet ball and the primary valve seat 5 are not in contact as a primary valve port opened, and the opening degree of the primary valve port is realized by adjusting the distance between the primary inlet ball and the primary valve seat 5; the secondary inlet spring, the secondary inlet guide seat, the secondary inlet ball, and the secondary valve seat 18 are provided as a secondary valve, the secondary inlet ball and the secondary valve seat 18 are sealed and connected as a secondary valve port closed, the secondary inlet ball and the secondary valve seat 18 are not in contact as a secondary valve port opened, and the opening degree of the secondary valve port is realized by adjusting the distance between the secondary inlet ball and the secondary valve seat 18.

[0082] The specific implementation method is as follows:

[0083] After the pressure of the primary pressure reducing valve and the secondary pressure reducing valve is adjusted, the primary valve port and the secondary valve port are in an open state under the working condition of not contacting the medium, and the inlet, the gas flow channel, and the outlet are in a communication state.

[0084] After the pressure of the primary and secondary pressure reducing valves is properly adjusted, when the pressure is higher than the set primary output pressure and the outlet of the secondary pressure reducing valve is closed with no gas output, the primary and secondary valves are in a sealed state, and the primary and secondary output pressures of the product are stable within the adjusted static pressure range.

[0085] When gas is discharged from the gas passage of the secondary pressure reducing valve, the pressure in the gas passage decreases, and the gas pressure on diaphragm 24 decreases. Under the pressure of the adjusting spring, diaphragm 24 moves towards the gas passage of the secondary pressure reducing valve, causing the secondary guide rod 19 to push the secondary inlet steel ball 17 away from the secondary valve seat 18. At this time, the gas in the gas passage of the primary pressure reducing valve enters the gas passage of the secondary pressure reducing valve through the secondary valve seat. As gas flows out of the gas passage of the primary pressure reducing valve, the gas pressure in the gas passage of the primary pressure reducing valve decreases. At this time, the gas pressure on piston 7 decreases, and under the action of the primary pressure adjusting spring 9, the force is transmitted to the primary inlet steel ball 4 through piston 7, causing the primary inlet steel ball 4 to disengage from the primary valve seat 5. The gas passage of the primary pressure reducing valve opens, and gas enters the gas passage of the primary pressure reducing valve from the primary pressure reducing valve inlet.

[0086] When the amount of gas entering the gas flow channel of the primary pressure reducing valve through the secondary valve valve is less than the amount of gas discharged from the secondary pressure reducing valve valve, the pressure in the gas flow channel of the secondary pressure reducing valve continues to decrease. The secondary valve valve will continue to expand, and the amount of gas entering the gas flow channel of the primary pressure reducing valve through the secondary valve valve will increase until the amount of gas entering the gas flow channel of the secondary pressure reducing valve through the secondary valve valve is the same as the amount of gas discharged from the secondary pressure reducing valve valve. Then, the output pressure and flow rate of the secondary pressure reducing valve remain stable. Similarly, when the amount of gas entering the gas flow channel of the primary pressure reducing valve through the secondary valve valve is greater than the amount of gas discharged from the secondary pressure reducing valve valve, the pressure in the gas flow channel of the secondary pressure reducing valve will increase, the secondary valve valve will narrow, and the amount of gas entering the gas flow channel of the primary pressure reducing valve through the secondary valve valve will decrease until the amount of gas entering the gas flow channel of the primary pressure reducing valve through the secondary valve valve is the same as the amount of gas discharged from the gas flow channel of the secondary pressure reducing valve. Then the output pressure and flow rate of the secondary pressure reducing valve will remain stable.

[0087] Similarly, when the amount of gas flowing into the gas flow passage of the first pressure reducing valve from the gas flow passage of the second pressure reducing valve through the second valve port is less than the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the first valve port, the pressure of the gas flow passage of the second pressure reducing valve continues to decrease, the second valve port continues to expand, the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the second valve port increases, until the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the second valve port is equal to the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the first valve port, the output pressure and the output flow of the second pressure reducing valve remain stable. When the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the second valve port is greater than the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the first valve port, the pressure of the gas flow passage of the second pressure reducing valve increases, the second valve port decreases, the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the second valve port decreases, until the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the second valve port is equal to the amount of gas flowing into the gas flow passage of the second pressure reducing valve from the gas flow passage of the first pressure reducing valve through the first valve port, the output pressure and the output flow of the second pressure reducing valve remain stable.

[0088] Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0089] The above is only an embodiment of the present application and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application is included in the scope of claims of the present application.

Claims

1. A two-stage reverse type non-unloading high pressure oxygen reducing valve, characterized by, The utility model relates to a kind of gas pressure regulating valve, including: Primary pressure reducing valve and secondary pressure reducing valve; The outlet of the primary pressure reducing valve and the inlet of the secondary pressure reducing valve are communicated, forming a gas flow channel; The primary pressure reducing valve and the secondary pressure reducing valve are provided with valve core structure; The valve core structure includes a primary valve and a secondary valve that work together to control the gas pressure in the gas flow channel; The primary valve is installed at the inlet of the primary pressure reducing valve; The secondary valve is installed at the inlet of the secondary pressure reducing valve; The secondary pressure reducing valve includes a secondary valve body assembly; The valve core structure of the secondary pressure reducing valve is installed in the secondary valve body assembly, including: a secondary pressure regulating assembly, a secondary valve seat (18), and a secondary valve core assembly arranged in sequence; The secondary valve core assembly and the secondary valve seat (18) are both installed in the gas flow channel along the direction of gas flow; The end of the secondary pressure regulating assembly passes through the secondary valve seat (18) towards the secondary valve core assembly; The end of the secondary pressure regulating assembly is covered by the secondary valve seat (18), and the end of the secondary pressure regulating assembly elastically abuts against the secondary valve core assembly. The secondary pressure regulating assembly includes a secondary pressure regulating body, a secondary guide rod (19), and a secondary inlet steel ball (17) fixedly connected in sequence; The secondary pressure regulating body is installed in the secondary valve body assembly; A secondary through hole is formed in the secondary valve seat (18); The secondary guide rod (19) passes through the secondary through hole; The diameter of the secondary inlet steel ball (17) is greater than the inner diameter of the secondary through hole, and the secondary inlet steel ball (17) is located at the end of the secondary through hole towards the secondary valve core assembly; The secondary inlet steel ball (17) elastically abuts against the secondary valve core assembly. A damping structure (31) is further provided on the secondary valve body assembly; The damping structure (31) is arranged along the movement direction of the secondary inlet steel ball (17); The damping structure (31) is provided at the end of the secondary pressure regulating body away from the secondary guide rod (19) and is elastically connected with the secondary pressure regulating body. The secondary pressure regulating body further includes a secondary spring seat (25) and a secondary pressure regulating stud (29); The damping structure (31) is sleeved on the vertical rod of the secondary spring seat (25) and is installed in the secondary pressure regulating stud (29); the damping structure (31) is a spring seat moving with a sensitive element and a four-fluorine sleeve sleeved outside the shaft diameter of the spring seat, which can change the size of the hole diameter under the action of the spring force.

2. The two-stage reverse type non-unloading high-pressure oxygen pressure reducing valve according to claim 1, characterized by The primary pressure reducing valve includes a primary valve body assembly; The valve core structure of the primary pressure reducing valve is installed in the primary valve body assembly, including: a primary pressure regulating assembly, a primary valve seat (5), and a primary valve core assembly arranged in sequence; The primary valve core assembly and the primary valve seat (5) are both installed in the gas flow channel along the direction of gas flow; The end of the primary pressure regulating assembly passes through the primary valve seat (5) towards the primary valve core assembly; The end of the primary pressure regulating assembly is covered by the primary valve seat (5), and the end of the primary pressure regulating assembly elastically abuts against the primary valve core assembly.

3. The two-stage reverse type non-unloading high-pressure oxygen pressure reducing valve according to claim 2, characterized by The primary pressure regulating assembly comprises a primary pressure regulating main body, a primary guide rod and a primary inlet steel ball (4) fixedly connected in sequence; The primary pressure regulating main body is installed in the primary valve body assembly; A primary through hole is formed in the primary valve seat (5); The primary guide rod is arranged in the primary through hole; The diameter of the primary inlet steel ball (4) is greater than the inner diameter of the primary through hole, and the primary inlet steel ball (4) is located at the end of the primary through hole facing the primary valve core assembly; The primary inlet steel ball (4) elastically abuts against the primary valve core assembly.

4. The two-stage reverse type non-unloading high-pressure oxygen reducing valve according to claim 3, characterized in that, The primary valve core assembly comprises a primary inlet spring (2) in a contracted state; The primary inlet spring (2) is arranged along the flow direction of the gas in the gas flow passage; One end of the primary inlet spring (2) is installed in the primary valve body assembly, and the other end elastically abuts against the primary inlet steel ball (4).

5. The two-stage reverse type non-unloading high-pressure oxygen reducing valve according to claim 4, characterized in that, The primary valve core assembly further comprises a primary inlet guide seat (3) in a columnar structure; The primary inlet guide seat (3) is arranged along the flow direction of the gas in the gas flow passage; The primary inlet guide seat (3) elastically abuts against the primary inlet spring (2), and the other end abuts against the primary inlet steel ball (4).

6. The two-stage reverse type non-unloading high pressure reducing valve according to claim 1, wherein The secondary valve core assembly comprises a secondary inlet spring (15) in a contracted state; The secondary inlet spring (15) is arranged along the flow direction of the gas in the gas flow passage; One end of the secondary inlet spring (15) is installed in the secondary valve body assembly, and the other end elastically abuts against the secondary inlet steel ball (17).

7. The two-stage reverse type non-unloading high-pressure oxygen reducing valve according to claim 6, characterized by The secondary valve core assembly further comprises a secondary inlet guide seat (16) in a columnar structure; The secondary inlet guide seat (16) is arranged along the flow direction of the gas in the gas flow passage; The secondary inlet guide seat (16) elastically abuts against the secondary inlet spring (15), and the other end abuts against the secondary inlet steel ball (17).

8. The two-stage reverse type non-unloading high pressure reducing valve according to claim 1, wherein A filter structure (30) is installed at the inlet of the primary pressure reducing valve.

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