A nitrogen spring loaded pressure reducing valve and its preset regulating device

Abstract

The present invention relates to a nitrogen spring loading force type pressure reducing valve and its preset adjustment device, wherein the valve core comprises: an upper core, a threaded air charging channel is arranged at the top; a connecting gasket is arranged at the inner circumference of the bottom of the upper core; a bellows, a first end of which is fixed to the bottom of the upper core and the connecting gasket; a lower core, a top of which is connected to the second end of the bellows circumferentially, and an air chamber is formed between the upper core, the bellows and the lower core; a guide sleeve is arranged at the middle of the lower core, a sliding elastic structure movably connected to the threaded air charging channel is arranged in the guide sleeve, and an air path connected to the threaded air charging channel is arranged at the lower part of the guide sleeve to fill nitrogen into the air chamber; a valve stem is arranged at the bottom of the lower core, and a lifting valve core is arranged at the bottom of the valve stem. And, an air charging control structure, the output end of which is connected to the threaded air charging channel, the upper part of the upper base is provided with an air charging control structure, and a spherical accommodating cavity is provided between the upper base and the lower base for accommodating the valve core, completely simulating the environment of a spherical pressure reducing valve.

Description

Technical Field

[0001] The invention relates to the technical field of nitrogen pressure regulating valves, in particular to a nitrogen spring loading force type pressure reducing valve and a preset regulating device thereof. Background Art

[0002] A nitrogen spring is an elastic component that uses high-pressure nitrogen as the working medium. It seals the high-pressure nitrogen in a certain container. External force compresses the nitrogen through the plunger rod. When the external force is removed, the high-pressure nitrogen expands to obtain a certain elastic force. The existing nitrogen springs on the market are inconvenient to set and calibrate the internal gas pressure when in use, and it is inconvenient to increase or decrease the pressure inside the nitrogen spring, and it is inconvenient to adjust, which makes the actual use of nitrogen springs still have certain defects. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a nitrogen spring loaded force type pressure reducing valve and a preset adjustment device thereof, which can preset and adjust the inflation and deflation of the nitrogen spring in the valve and perform pressure adjustment calibration on the pressure regulating valve.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a nitrogen spring loaded pressure reducing valve, comprising a valve core and a valve body, wherein the valve core is arranged in the valve body; the valve core comprises: an upper core, a threaded air charging channel integrally formed therewith is arranged at the top thereof; a connecting gasket is arranged on the inner circumference of the bottom of the upper core and is located at the same horizontal plane as the end of the upper core; a bellows, a first end of which is fixed to the bottom of the upper core and the connecting gasket; a lower core, a top of which is connected to the second end of the bellows in the circumference, and an air chamber is formed between the upper core, the bellows and the lower core; a guide sleeve is arranged in the middle of the lower core, a sliding elastic structure movably connected to the threaded air charging channel is arranged in the guide sleeve, and an air path connected to the threaded air charging channel is arranged in the lower part of the guide sleeve to fill nitrogen into the air chamber; a valve stem is arranged at the bottom of the lower core, and a lifting valve core is arranged at the bottom of the valve stem.

[0005] Furthermore, the valve core also includes a conical top screw; the conical top screw is arranged in the threaded inflation channel, and its bottom conical end is arranged corresponding to the air outlet of the threaded inflation channel, and a gas flow channel connected to the threaded inflation channel is opened in the conical top screw.

[0006] Furthermore, the valve core also includes an air guide tube; the first end of the air guide tube is threadedly connected to the outside of the threaded inflation channel, the second end of the air guide tube is located at the center of the lower core, and there is an installation space between the air guide tube and the guide sleeve.

[0007] Furthermore, the sliding elastic structure includes an annular slide rail, a sliding ring and a first spring; the annular slide rail is arranged on the upper part of the installation space; the sliding ring is embedded in the annular slide rail, one side of which contacts the outer wall of the air duct and slides up and down along the outer wall of the air duct; the first spring is arranged in the installation space below the annular slide rail, the first end of the first spring is connected to the bottom of the annular slide rail, and the second end of the first spring is connected to the air duct.

[0008] Furthermore, a first limiting groove is provided on the inner side of the top of the guide sleeve, and a second limiting groove is provided on the outer side of the top of the air guide tube, and the travel of the annular slide rail is limited by the first limiting groove and the second limiting groove.

[0009] Furthermore, a rotation-stopping boss is arranged on the outer side of the bottom of the upper core.

[0010] A preset adjustment device for a nitrogen spring loaded force pressure reducing valve, which is used to perform pressure adjustment calibration on a valve core of the nitrogen spring loaded force pressure reducing valve, and comprises: an inflation control structure, whose output end is connected to the threaded inflation channel of the valve core, and a first NPT interface is provided on the inflation control structure, and the first NPT interface is an air inlet; a base, which comprises a lower base and an upper base, the inflation control structure is provided on the upper part of the upper base, and the upper base is provided on the top of the lower base, and a spherical receiving cavity is provided between the two for accommodating the valve core, and the spherical receiving cavity completely simulates the environment of a spherical pressure reducing valve.

[0011] Furthermore, the cross-section of the lower base adopts a convex structure, and an arc-shaped lower groove is arranged on the top of the lower base, and a second NPT interface connected to the arc-shaped lower groove is arranged at the bottom, and the second NPT interface is the working pressure inlet and outlet interface of the pressure reducing valve; the top of the upper base has a connecting boss, and the bottom is provided with a two-stage groove, the first-stage groove is an arc-shaped upper groove, which is arranged corresponding to the arc-shaped lower groove, and the arc-shaped upper groove and the arc-shaped lower groove form the spherical receiving cavity; the second-stage groove is a stepped groove, which is used to cooperate with the top of the lower base.

[0012] Furthermore, a third NPT interface communicating with the first-stage groove is provided on the side of the upper base, and the third NPT interface is a pressure-regulated air outlet interface; an upper connecting channel communicating with the first-stage groove is provided on the top of the boss of the upper base.

[0013] Furthermore, the inflation control structure includes an inflation lower cover, an inflation upper cover, an inflation pin and a second spring; a connecting protrusion is provided in the middle of the bottom of the inflation lower cover, the connecting protrusion is provided in the upper connecting channel of the upper base, and a control channel is provided in the inflation lower cover, and the first NPT interface is provided on the side of the inflation lower cover and communicated with the control channel; the inflation upper cover is provided on the top of the inflation lower cover; the inflation pin is provided in the control channel, and its top is located at the upper part of the control channel, and the second spring is provided in the upper control channel, and the bottom of the second spring is connected to the top of the inflation pin; the bottom of the inflation pin passes through the control channel and extends into the threaded inflation channel, and cooperates with the top hexagonal groove of the conical top screw to control the movement of the conical top screw.

[0014] The present invention adopts the above technical solution, which has the following advantages:

[0015] 1. The present invention is easy to operate, and on-site operators can operate it by themselves according to the operating instructions. It has high charging and discharging efficiency and is safe and stable.

[0016] 2. The present invention completely simulates the internal environment of the pressure reducing valve, adopts the same cavity and the same flow channel environment, so that the pressure can be adjusted online, and the preset pressure adjustment calibration is accurate. After the nitrogen spring is preset in the device, it is implanted in the pressure reducing valve, which effectively improves the production efficiency and success rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the valve core structure of the nitrogen spring loading force type pressure reducing valve in the embodiment of the present invention;

[0018] Figure 2 1 is a schematic diagram of the structure of a preset adjustment device of a nitrogen spring loading force type pressure reducing valve in an embodiment of the present invention;

[0019] Figure 3 It is a partial enlarged view of the spherical receiving cavity of the preset adjustment device in the embodiment of the present invention;

[0020] Reference numerals:

[0021] 1-valve core, 2-upper core, 3-threaded inflation channel, 4-connecting gasket, 5-bellows, 6-lower core, 7-air chamber, 8-guide sleeve, 9-valve stem, 10-lift valve core, 11-conical top screw, 12-air guide tube, 13-annular slide rail, 14-sliding ring, 15-first spring, 16-elastic retaining ring, 17-first limiting groove, 18-second limiting groove, 19-positioning retaining ring, 20-stop rotation boss, 21-first NPT interface, 22-lower base, 23-upper base, 24-spherical placement cavity, 25-second NPT interface, 26-third NPT interface, 27-sealing plug, 28-inflatable lower cover, 29-inflatable upper cover, 30-inflatable spring pin, 31-second spring, 32-sealing pad. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the embodiment of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0023] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0024] In order to solve the problems of inflation and deflation of the nitrogen spring in the valve and pressure regulation calibration of the pressure reducing valve when the nitrogen spring loaded pressure regulating valve is preset, the present invention proposes a nitrogen spring loaded pressure reducing valve and a preset adjustment device thereof, wherein the valve core comprises: an upper core, a threaded inflation channel is arranged on the top; a connecting gasket is arranged on the inner circumference of the bottom of the upper core; a bellows, a first end of which is fixed to the bottom of the upper core and the connecting gasket; a lower core, a top of which is connected to the second end of the bellows circumferentially, and an air chamber is formed between the upper core, the bellows and the lower core; a guide sleeve is arranged in the middle of the lower core, a sliding elastic structure movably connected to the threaded inflation channel is arranged in the guide sleeve, and an air path connected to the threaded inflation channel is arranged at the lower part of the guide sleeve to fill nitrogen into the air chamber; a valve stem is arranged at the bottom of the lower core, and a lifting valve core is arranged at the bottom of the valve stem. And, the inflation control structure, whose output end is connected to the threaded inflation channel, is provided with an inflation control structure on the upper part of the upper base, and a spherical receiving cavity is provided between the upper base and the lower base for accommodating the valve core, which completely simulates the environment of a spherical pressure reducing valve. The present invention can preset and adjust the inflation and deflation of the nitrogen spring in the valve, and calibrate the pressure regulating valve.

[0025] In one embodiment of the present invention, a nitrogen spring loading force type pressure reducing valve is provided. In this embodiment, the pressure reducing valve comprises a valve core 1 and a valve body, the valve core 1 is arranged in the valve body, and both are spherical mechanisms. Figure 1 As shown, the valve core 1 comprises:

[0026] The upper core 2 adopts a hemispherical structure, and a threaded air-filling channel 3 integrally formed therewith is provided on its top, and the threaded air-filling channel 3 extends downward to form an extension portion, and the end of the extension portion is located in the same horizontal plane as the end of the upper core 2;

[0027] The connecting gasket 4 is arranged on the inner circumference of the bottom of the upper core 2 and is located at the same level as the end of the upper core 2;

[0028] A bellows 5, a first end of which is fixed to the bottom of the upper core 2 and the connecting gasket 4;

[0029] The lower core 6 has a top portion circumferentially connected to the second end of the bellows 5, and an air chamber 7 is formed between the upper core 2, the bellows 5 and the lower core 6; a guide sleeve 8 is provided in the middle of the lower core 6, a sliding elastic structure movably connected to the threaded air charging channel 3 is provided in the guide sleeve 8, and an air path connected to the threaded air charging channel 3 is provided at the lower portion of the guide sleeve 8, so as to fill the air chamber 7 with nitrogen;

[0030] The valve stem 9 is arranged at the bottom of the lower core 6 , and a lifting valve core 10 is arranged at the bottom of the valve stem 9 .

[0031] When in use, the bellows 5 is used to replace the traditional valve body diaphragm for gas sensing, nitrogen is filled into the air chamber 7 through the threaded gas charging channel 3, and the bellows 5 and the sliding elastic structure jointly drive the lower core 6 to move downward, thereby driving the valve stem 9 and the lifting valve core 10 to move downward; when exhausting, the nitrogen in the air chamber 7 is transmitted to the threaded gas charging channel 3 through the gas path at the lower part of the guide sleeve 8, and the nitrogen in the air chamber 7 is discharged. At this time, the bellows 5 and the sliding elastic structure jointly drive the lower core 7 to move upward, thereby driving the valve stem 9 and the lifting valve core 10 to move upward. By lifting the valve core 10 up and down, the size of the air inlet gap between the valve core and the valve body is changed, thereby adjusting the outlet pressure.

[0032] In a feasible embodiment, the valve core 1 of the present invention further includes a conical top screw 11. The conical top screw 11 is arranged in the threaded air charging channel 3, and its bottom conical end is arranged corresponding to the air outlet of the threaded air charging channel 3, and the outer surface of the conical top screw 11 is provided with an external thread matching the threaded air charging channel 3.

[0033] A hexagonal groove for adjustment is provided at the top of the conical top screw 11 , and a gas flow channel is opened in the conical top screw 11 , and the gas flow channel is communicated with the threaded inflation channel 3 .

[0034] In a feasible embodiment, the valve core 1 of the present invention further includes an air guide tube 12. The first end of the air guide tube 12 is threadedly connected to the outside of the threaded inflation channel 3, and the second end of the air guide tube 12 is located at the center of the lower core 6. When not inflated, the second end of the air guide tube 12 contacts the center of the lower core 6 to form a closed state. When inflated, the second end of the air guide tube 12 is away from the lower core 6 to output the charged nitrogen. There is an installation space between the air guide tube 12 and the guide sleeve 8.

[0035] In a feasible embodiment, the sliding elastic structure includes an annular slide rail 13, a sliding ring 14 and a first spring 15. The annular slide rail 13 is arranged in the upper part of the installation space between the guide sleeve 8 and the air duct 12; the sliding ring 14 is embedded in the annular slide rail 13, one side of which contacts the outer wall of the air duct 12 and slides up and down along the outer wall of the air duct 12. A first spring 15 is arranged in the installation space below the annular slide rail 13, the first end of the first spring 15 is connected to the bottom of the annular slide rail 13, and the second end of the first spring 15 is connected to the air duct 12. When in use, when the sliding ring 14 moves downward, the first spring 15 is compressed, the air duct 12 is away from the lower core 6, and the lower core 6 moves downward; conversely, the elastic force of the first spring 15 pushes the sliding ring 14 to move upward.

[0036] Optionally, an elastic retaining ring 16 is provided on the top of the guide sleeve 8 to limit the position of the annular slide rail 13 and prevent the sliding ring 14 from slipping.

[0037] Optionally, a first limiting groove 17 is provided on the inner side of the top of the guide sleeve 8, and a second limiting groove 18 is provided on the outer side of the top of the air guide tube 12. The stroke of the annular slide rail 13 is limited by the first limiting groove 17 and the second limiting groove 18, and the stroke is arranged corresponding to the telescopic stroke of the bellows 5.

[0038] In an optional embodiment, the valve core of the present invention further includes a positioning spring 19. The top of the valve stem 9 is connected to the bottom of the lower core 6 through the positioning spring 19. Specifically, an annular mounting groove is provided at the bottom of the lower core 6 for facilitating the installation of the positioning spring 19; the top of the valve stem 9 is a T-shaped structure, and the head of the T-shaped structure is used to install the positioning spring 19, and then the valve stem 9 is installed at the bottom of the lower core 6 by the positioning spring 19.

[0039] In an optional embodiment, a rotation-stopping boss 20 is further provided on the outer side of the bottom of the upper core 2. In this embodiment, preferably, two rotation-stopping bosses 20 are provided, symmetrically arranged on both sides of the upper core 2. When in use, the rotation-stopping bosses 20 effectively improve the stability of the valve core.

[0040] In summary, when the valve core of the present invention is in use, the conical top screw 11 is loosened by external force, the threaded inflation channel 3 is opened, and nitrogen enters the air guide pipe 12 through the threaded inflation channel 3. The air guide pipe 12 is moved away from the lower core 6 by the nitrogen gas pressure, so that the nitrogen enters the air chamber 7 through the installation space and the air path on the guide sleeve 8 in turn, and the air chamber 7 is filled with nitrogen to drive the valve stem 9 and the lifting valve core 10 to perform pressure regulation.

[0041] In one embodiment of the present invention, a preset adjustment device for a nitrogen spring loading force pressure reducing valve is provided. In this embodiment, the preset adjustment device completely simulates the internal environment of the pressure reducing valve, uses the same cavity and the same flow channel environment to perform online pressure adjustment on the valve core 1 of the nitrogen spring loading force pressure reducing valve in the above embodiment, and after the preset pressure adjustment of the valve core 1 is accurately calibrated, it is implanted in the pressure reducing valve. Specifically, Figure 2 , Figure 3 As shown, the preset adjustment device includes:

[0042] The inflation control structure has an output end connected to the threaded inflation channel 3 of the upper core 2 of the valve core 1 to control the delivery of nitrogen into the threaded inflation channel 3, and a first NPT interface 21 is provided on the inflation control structure, and the first NPT interface 21 is an air inlet;

[0043] The base is arranged at the lower part of the inflation control structure, and includes a lower base 22 and an upper base 23. The upper part of the upper base 23 is provided with an inflation control structure, and the upper base 23 is arranged on the top of the lower base 22, and there is a spherical receiving cavity 24 between the two for accommodating the valve core 1. The spherical receiving cavity 24 completely simulates the environment of the spherical pressure reducing valve.

[0044] In a feasible implementation, the cross section of the lower base 22 adopts a convex structure, and an arc-shaped lower groove is provided on the top of the lower base 22, and a second NPT interface 25 connected to the arc-shaped lower groove is provided at the bottom, and the second NPT interface 25 is a gas inlet and outlet interface of the working pressure of the pressure reducing valve. When in use, after the gas of the nitrogen spring valve core is preset, the gas of the set working pressure is input through the second NPT interface 25 to simulate the pressure regulation and calibration process of the pressure reducing valve.

[0045] Optionally, a pressure tester is provided at the first NPT interface 21 to detect the gas pressure in the valve core 1, and then cooperate with the second NPT interface 25 to adjust the pressure of the pressure reducing valve.

[0046] In a feasible embodiment, the top of the upper base 23 has a connecting boss, and the bottom is provided with a two-stage groove, the first-stage groove is an arc-shaped upper groove, which is arranged corresponding to the arc-shaped lower groove on the lower base 22, and the arc-shaped upper groove and the arc-shaped lower groove form a spherical receiving cavity 24; the second-stage groove is a stepped groove, which is used to cooperate with the top of the lower base 22, and a sealing ring is provided between the second-stage groove and the top of the lower base 22 to seal the spherical receiving cavity 24.

[0047] Optionally, a third NPT interface 26 connected to the first-stage groove is provided on the side of the upper base 23, and the third NPT interface 26 is a pressure regulating outlet interface. When in use, after the nitrogen spring valve core 1 is filled with gas, the assembled internal environment in the spherical receiving chamber 24 is completely restored to simulate the internal environment of the pressure reducing valve, and the pressure reducing valve outlet demand pressure is directly simulated online through the third NPT interface 26 to test the pressure regulating and calibrating the internal pressure of the nitrogen spring valve core.

[0048] A sealing plug 27 is provided at the third NPT interface 26 , and the sealing plug 27 ensures that the spherical receiving cavity 24 is in a sealed state during inflation.

[0049] Optionally, an upper connecting channel connected to the first-stage groove is provided on the top of the boss of the upper base 23 to connect with the inflation control structure and ensure that the nitrogen transported in the inflation control structure enters the valve core 1.

[0050] Optionally, a first groove is provided at the connection of the two-stage grooves of the upper base 23, and correspondingly, a second groove is provided on the inner side of the top of the arc-shaped lower groove of the lower base 22, and the first groove and the second groove form a stop groove, and the stop boss 20 of the valve core 1 is provided in the stop groove.

[0051] In a feasible implementation manner, the inflation control structure includes an inflation lower cover 28 , an inflation upper cover 29 , an inflation spring pin 30 and a second spring 31 .

[0052] A connecting protrusion is provided at the middle of the bottom of the inflatable lower cover 28, and the connecting protrusion is provided in the upper connecting channel of the upper base 23, and a control channel is provided in the inflatable lower cover 28, and the first NPT interface 21 is provided at the side of the inflatable lower cover 28, and communicates with the control channel; the control channel is a stepped structure, and the upper diameter is much larger than the lower diameter;

[0053] The inflatable upper cover 29 is arranged on the top of the inflatable lower cover 28, and a through hole is arranged on the top of the inflatable upper cover 29;

[0054] The inflatable spring pin 30 is arranged in the control channel, and its top is located at the upper part of the control channel. A second spring 31 is arranged in the upper control channel, and the bottom of the second spring 31 is connected to the top of the inflatable spring pin 30; the bottom of the inflatable spring pin 30 can extend into the threaded inflatable channel 3 after passing through the control channel, and cooperate with the top hexagonal groove of the conical top screw 11 to control the movement of the conical top screw 11.

[0055] A groove is provided at the top of the inflatable bullet 30 for pressing the inflatable bullet 30 downward and rotating it.

[0056] In this embodiment, a sealing gasket 32 ​​is provided in the spherical receiving cavity 24 at the inflation spring 30 between the spherical receiving cavity 24 and the top of the upper core 2 .

[0057] In summary, when in use, the nitrogen spring valve core 1 is inflated and exhausted and pressure calibrated through the first NPT interface 21. When inflating and exhausting, the conical top screw 11 is loosened through the inflating needle 30. After completion, the inflating needle 30 is pressed and tightened to close the seal. For example, when inflating the nitrogen spring valve core 1, the first NPT interface 21 is connected to a pure nitrogen gas source, and the inflating needle 30 is pressed downward through a tool such as an inner hexagonal wrench until the needle of the inflating needle 30 contacts and inserts into the hexagonal groove of the conical top screw 11, and then the inflating needle 30 is rotated counterclockwise to loosen the conical top screw 11, and then the air chamber 7 can be inflated. When the gas in the air chamber 7 reaches the required gas, the aforementioned process is repeated, and the inflating needle 30 is pressed downward until the needle of the inflating needle 30 is inserted into the hexagonal groove of the conical top screw 11, and the inflating needle 30 is rotated clockwise to lock the conical top screw 11 (the conical head seals the gas) to complete the inflation. Then, the environment inside the spherical cavity 24 is adjusted through the first NPT interface 21, the second NPT interface 25 and the third NPT interface 26 to completely simulate the internal environment of the pressure reducing valve, so as to perform online pressure regulation on the valve core 1 of the nitrogen spring loaded force type pressure reducing valve, and after the preset pressure regulation of the valve core 1 is accurately calibrated, it is implanted in the pressure reducing valve.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nitrogen spring loaded pressure reducing valve, comprising a valve core (1) and a valve body, wherein the valve core (1) is arranged in the valve body; characterized in that: The valve core (1) comprises: An upper core (2), the top of which is provided with a threaded air-filling channel (3) integrally formed therewith; A connecting gasket (4) is arranged on the inner circumference of the bottom of the upper core (2) and is located on the same horizontal plane as the end of the upper core (2); A bellows (5), a first end of which is fixed to the bottom of the upper core (2) and the connecting gasket (4); A lower core (6), the top of which is circumferentially connected to the second end of the bellows (5), and an air chamber (7) is formed between the upper core (2), the bellows (5) and the lower core (6); a guide sleeve (8) is provided in the middle of the lower core (6), a sliding elastic structure movably connected to the threaded air charging channel (3) is provided in the guide sleeve (8), and an air path connected to the threaded air charging channel (3) is provided at the bottom of the guide sleeve (8) so as to fill the air chamber (7) with nitrogen; A valve stem (9) is arranged at the bottom of the lower core (6), and a lifting valve core (10) is arranged at the bottom of the valve stem (9); The valve core (1) further comprises an air guide tube (12); a first end of the air guide tube (12) is threadedly connected to the outside of the threaded inflation channel (3), a second end of the air guide tube (12) is located at the center of the lower core (6), and an installation space is provided between the air guide tube (12) and the guide sleeve (8); The sliding elastic structure comprises an annular sliding rail (13), a sliding ring (14) and a first spring (15); The annular slide rail (13) is arranged in an annular manner on the upper part of the installation space; The sliding ring (14) is embedded in the annular slide rail (13), one side of which contacts the outer wall of the air guide tube (12) and slides up and down along the outer wall of the air guide tube (12); The first spring (15) is arranged in the installation space below the annular slide rail (13), the first end of the first spring (15) is connected to the bottom of the annular slide rail (13), and the second end of the first spring (15) is connected to the air guide pipe (12); A first limiting groove (17) is provided on the inner side of the top of the guide sleeve (8), and a second limiting groove (18) is provided on the outer side of the top of the air guide tube (12), and the travel of the annular slide rail (13) is limited by the first limiting groove (17) and the second limiting groove (18).

2. The nitrogen spring loaded pressure reducing valve according to claim 1, characterized in that: The valve core (1) further comprises a conical top screw (11); the conical top screw (11) is arranged in the threaded air charging channel (3), the conical end of the bottom thereof is arranged corresponding to the air outlet of the threaded air charging channel (3), and a gas flow channel connected to the threaded air charging channel (3) is opened in the conical top screw (11).

3. The nitrogen spring loaded pressure reducing valve according to claim 1, characterized in that: A rotation-stopping boss (20) is arranged on the outer side of the bottom of the upper core (2).

4. A preset adjustment device for a nitrogen spring loaded force pressure reducing valve, the preset adjustment device is used to perform pressure adjustment calibration on the valve core (1) of the nitrogen spring loaded force pressure reducing valve as claimed in claim 2, characterized in that: include: An inflation control structure, the output end of which is connected to the threaded inflation channel (3) of the valve core (1), and a first NPT interface (21) is provided on the inflation control structure, and the first NPT interface (21) is an air inlet; A base, comprising a lower base (22) and an upper base (23), wherein the inflation control structure is arranged on the upper part of the upper base (23), and the upper base (23) is arranged on the top of the lower base (22), and a spherical receiving cavity (24) is provided between the two for accommodating the valve core (1), and the spherical receiving cavity (24) completely simulates the environment of a spherical pressure reducing valve; The inflation control structure comprises an inflation lower cover (28), an inflation upper cover (29), an inflation spring pin (30) and a second spring (31); A connecting protrusion is provided at the middle of the bottom of the inflatable lower cover (28), and the connecting protrusion is arranged in the upper connecting channel of the upper base (23), and a control channel is arranged in the inflatable lower cover (28), and the first NPT interface (21) is arranged on the side of the inflatable lower cover (28) and communicates with the control channel; The inflatable upper cover (29) is arranged on the top of the inflatable lower cover (28); The inflatable spring pin (30) is arranged in the control channel, and its top is located at the upper part of the control channel. The second spring (31) is arranged in the upper part of the control channel, and the bottom of the second spring (31) is connected to the top of the inflatable spring pin (30). The bottom of the inflatable spring pin (30) passes through the control channel and then extends into the threaded inflatable channel (3), and cooperates with the hexagonal groove at the top of the conical top screw (11) to control the movement of the conical top screw (11).

5. The preset adjustment device of the nitrogen spring loading force type pressure reducing valve as claimed in claim 4, characterized in that: The cross section of the lower base (22) adopts a convex structure, and an arc-shaped lower groove is arranged on the top of the lower base (22), and a second NPT interface (25) connected to the arc-shaped lower groove is arranged at the bottom, and the second NPT interface (25) is a working pressure inlet and outlet interface of the pressure reducing valve; The top of the upper base (23) is provided with a connecting boss, and the bottom is provided with a two-stage groove, wherein the first-stage groove is an arc-shaped upper groove, which is arranged correspondingly to the arc-shaped lower groove, and the arc-shaped upper groove and the arc-shaped lower groove form the spherical receiving cavity (24); the second-stage groove is a stepped groove, which is used to cooperate with the top of the lower base (22).

6. The preset adjustment device of the nitrogen spring loading force type pressure reducing valve as claimed in claim 5, characterized in that: A third NPT interface (26) communicating with the first-stage groove is provided on the side of the upper base (23), and the third NPT interface (26) is a pressure regulating air outlet interface; An upper connecting channel communicating with the first-stage groove is provided at the top of the boss of the upper base (23).

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