CN219317721U - High-precision nitrogen seal valve controlled by low pressure - Google Patents
High-precision nitrogen seal valve controlled by low pressure Download PDFInfo
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- CN219317721U CN219317721U CN202320094756.1U CN202320094756U CN219317721U CN 219317721 U CN219317721 U CN 219317721U CN 202320094756 U CN202320094756 U CN 202320094756U CN 219317721 U CN219317721 U CN 219317721U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The utility model relates to the technical field of valves, in particular to a high-precision nitrogen seal valve controlled by low pressure. The valve comprises a valve body assembly, a pressure balance assembly and a diaphragm control assembly, wherein the valve body assembly comprises a valve body, a valve core, a nitrogen inlet connecting pipe and a nitrogen outlet connecting pipe; the pressure balance assembly comprises a shell, a spring and a lower pressing plate, the diaphragm control assembly comprises a shell, a diaphragm, a conducting mechanism and a pressure taking pipe, the conducting mechanism is arranged on the diaphragm, the uppermost end of the conducting mechanism is propped against the lower end face of the valve core, the pressure taking pipe is arranged at the bottom of the shell, the pressure taking pipe is communicated with the second cavity, and the other end of the pressure taking pipe is connected to the top of storage tank equipment needing nitrogen sealing. The utility model has the advantages of accurate pressure setting, small opening and closing pressure difference range, small control fluctuation of nitrogen pressure range, large circulation capacity, nitrogen saving and cost saving under low setting pressure.
Description
Technical Field
The utility model relates to the technical field of valves, in particular to a high-precision nitrogen seal valve controlled by low pressure.
Background
Along with the continuous improvement of the safety and environmental protection requirements of the storage tank field, the requirements of the old storage tank transformation and the newly-built storage tank on the nitrogen sealing system are also continuously improved. The nitrogen seal valve is mainly used for keeping the pressure of protective gas (generally nitrogen) at the top of the container constant so as to avoid direct contact between materials in the container and air, prevent the materials from volatilizing and being oxidized and ensure the safety of the container. The high-precision nitrogen seal valve is particularly suitable for air seal protection systems of various large storage tanks, and is used for improving old storage tanks, in order to reduce nitrogen consumption, the nitrogen seal set pressure of the storage tank is continuously reduced, so that the pressure adjusting range of the nitrogen seal system of the storage tank is more accurate and lower, and the requirement on precision is higher. Therefore, the setting pressure of the nitrogen seal valve is required to be lower, the reaction is more sensitive, the circulation capacity is also higher, and the nitrogen seal system is required to be more stable and reliable.
The existing nitrogen seal valve is mainly a self-operated regulating valve, which is divided into a nitrogen inlet device and a nitrogen discharge device, has large pressure control deviation, and consists of a control valve, an actuator, a pressure spring, a director, a pulse tube and other parts, and a pressure taking port is arranged on a pipeline. The following disadvantages are mainly present:
1. the existing nitrogen control valve has the defects of low machining precision, no custom machining, relatively complex valve structure, large component assembly deviation, unstable spring performance and the like, so that the set pressure fluctuation range is large, the control is inaccurate, the pressure fluctuation range is large, and the nitrogen waste is serious.
2. The existing nitrogen control valve is divided into a nitrogen inlet valve and a nitrogen outlet valve, and has the defects of low processing precision, inaccurate set pressure, relatively complex structure, short service life and more hidden dangers brought to a using unit.
3. Because the pressure difference ratio is too high, the traditional valve cannot select, and the pressure of an external air source is reduced by adding a pressure reducing valve.
Disclosure of Invention
The utility model solves the problems that: the nitrogen control valve in the prior art has the problems of large fluctuation range of pressure range, serious nitrogen waste, complex structure, need of a pressure reducing valve and the like, and provides the high-precision nitrogen seal valve with stable pressure control and simple structure and low pressure control.
The utility model is realized by the following technical proposal, the high-precision nitrogen seal valve controlled by low pressure comprises a valve body component, a pressure balance component and a diaphragm control component,
the valve body assembly comprises a valve body, a valve core, a nitrogen inlet connecting pipe and a nitrogen outlet connecting pipe; the valve body is internally provided with a valve seat and a valve core, the middle part of the valve core is provided with a sealing surface matched with the valve seat, the upper surface and the lower surface of the valve body are provided with mounting holes, the upper end and the lower end of the valve core are in sliding sealing connection with the mounting holes of the valve body, the valve seat and the valve core divide the interior of the valve body into an upper cavity and a lower cavity, the nitrogen inlet connecting pipe and the nitrogen outlet connecting pipe are arranged on the valve body and communicated with the lower cavity, the nitrogen outlet connecting pipe is communicated with the upper cavity and connected with a nitrogen supply pipeline, the nitrogen outlet connecting pipe is connected to the top of storage tank equipment needing nitrogen sealing,
the pressure balance component comprises a shell, a spring and a lower pressure plate, wherein the upper end of the shell is connected with the upper end of the valve body in a sealing way, the spring and the lower pressure plate are arranged in the shell, the upper surface of the lower pressure plate is propped against the spring, the lower surface is propped against the upper end face of the valve core,
the diaphragm control assembly comprises a shell, a diaphragm, a conducting mechanism and a pressure taking pipe, wherein the lower ends of the shell and the valve body are in sealing connection, the diaphragm is arranged in the shell, the conducting mechanism is installed on the diaphragm, the uppermost end of the conducting mechanism is abutted against the lower end face of the valve core, the diaphragm is downwards raised under the pressure action of the conducting mechanism, the diaphragm is used for separating the shell into a first cavity and a second cavity which are mutually sealed, the conducting mechanism is located in the first cavity, the pressure taking pipe is arranged at the bottom of the shell, the pressure taking pipe is communicated with the second cavity, and the other end of the pressure taking pipe is connected to the top of storage tank equipment needing nitrogen sealing.
Further, the sealing surface department in the middle part of the valve core is provided with the ring channel, install O shape sealing washer in the ring channel, the case overcoat is equipped with the stop collar, the stop collar is from upwards overlapping from the lower outside the valve core of establishing, the locating surface of stop collar and valve core offsets, the upper end of stop collar forms the spacing shielding of at least half diameter height to O shape sealing washer, the lower surface of stop collar is spacing through the jump ring, disk seat and O shape sealing washer offset when the valve is closed.
Further, the pressure balance component is also provided with a nut, an adjusting screw and an upper pressing plate, the upper end of the shell is provided with a guide groove, the top of the guide groove is fixedly provided with the nut, the adjusting screw is slidably arranged in the guide groove and is in threaded fit with the nut, the lower end of the adjusting screw is propped against the upper pressing plate, the spring is arranged between the lower pressing plate and the upper pressing plate,
further, a dust cover is sleeved on the outer side of the part, extending out of the shell, of the adjusting screw.
Further, the upper pressing plate and the lower pressing plate are both provided with bosses limiting the springs.
Further, the bottom of the adjusting screw is arranged to be conical, a conical groove is formed in the center of the matching surface of the upper pressing plate, and the cone angle of the conical groove is slightly larger than that of the bottom of the screw.
Further, the shell of the diaphragm control assembly is of a detachable two-flap structure, the diaphragm is detachably arranged between the two-flap shell through a fastener, and the diaphragm is provided with various replaceable different thickness specifications.
The beneficial effects of the utility model are as follows:
1. the utility model is provided with the diaphragm control assembly and the pressure balance assembly to control the valve core to move, and the diaphragm can convert the nitrogen pressure in the oil tank into an amplified pressure signal due to the large area, so that the valve core can be flexibly controlled, the nitrogen pressure in the oil tank is ensured to be stable in a certain interval, and the control is very sensitive. The nitrogen seal valve provided by the utility model has the advantages that under the condition of low set pressure, the pressure setting is accurate, the opening and closing pressure difference range is small, the control fluctuation of the nitrogen pressure range is small, the circulation capacity is large, the nitrogen is saved, and the cost is saved.
2. The inlet of the nitrogen sealing valve can be directly connected with an external nitrogen source without installing a pressure reducing valve, and the set pressure of nitrogen can be as low as 0.2kpa, so that the pressure reducing ratio is high.
3. The nitrogen seal valve can accurately set pressure by rotating the adjusting screw or replacing membranes with different specifications, and is very convenient to adjust.
Drawings
FIG. 1 is a schematic diagram of a low pressure controlled high precision nitrogen seal valve according to the present utility model;
fig. 2 is an enlarged view of a portion of a valve body assembly according to the present utility model.
In the figure:
1, a valve body assembly; 101, nitrogen inlet connection pipe; 102, nitrogen outlet connection pipe; 103 valve body; 1031 valve seats; 1032 upper cavity; 1033 lower cavity; 104 valve core; 105O-ring seal; 106 annular grooves; 107 spacing sleeve; 108 clamping springs;
2 a pressure balancing assembly; 201 a housing; 202 springs; 203 lower pressing plates; a 204 nut; 205 adjusting the screw; 206 upper press plate; 207 dust cap;
3 a diaphragm control assembly; 301 a housing; 302 a membrane; 303 conductive mechanisms; 304 a pressure taking tube; 305 a first cavity; 306 a second cavity.
Detailed Description
The technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some of the embodiments of the present utility model, i.e. Shi Li, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1-2, a high-precision nitrogen seal valve for low-pressure control comprises a valve body assembly 1, a pressure balance assembly 2 and a diaphragm control assembly 3,
the valve body assembly 1 comprises a valve body 103, a valve core 104, a nitrogen inlet connecting pipe 101 and a nitrogen outlet connecting pipe 102; a valve seat 1031 and a valve core 104 are arranged in the valve body 103, a sealing surface matched with the valve seat 1031 is arranged in the middle of the valve core 104, mounting holes are arranged on the upper surface and the lower surface of the valve body 103, the upper end and the lower end of the valve core 104 are in sliding sealing connection with the mounting holes of the valve body 103, the valve seat 1031 and the valve core 104 divide the interior of the valve body 103 into an upper cavity 1033 and a lower cavity 1033, the nitrogen inlet connecting pipe 101 and the nitrogen outlet connecting pipe 102 are arranged on the valve body 103, the nitrogen inlet connecting pipe 101 is communicated with the lower cavity 1033, the nitrogen outlet connecting pipe 102 is communicated with the upper cavity 1033, the nitrogen inlet connecting pipe 101 is connected to a nitrogen supply pipeline, the nitrogen outlet connecting pipe 102 is connected to the top of a storage tank device needing nitrogen sealing,
the pressure balance assembly 2 comprises a shell 201, a spring 202 and a lower pressing plate 203, wherein the shell 201 is in sealing connection with the upper end of the valve body 103, the spring 202 and the lower pressing plate 203 are arranged in the shell 201, the upper surface of the lower pressing plate 203 is abutted against the spring 202, the lower surface is abutted against the upper end face of the valve core 104,
the diaphragm control assembly 3 comprises a shell 301, a diaphragm 302, a conducting mechanism 303 and a pressure taking pipe 304, wherein the lower ends of the shell 301 and the valve body 103 are in sealing connection, the diaphragm 302 is arranged in the shell 301, the conducting mechanism 303 is installed on the diaphragm 302, the uppermost end of the conducting mechanism 303 is abutted against the lower end face of the valve core 104, the diaphragm 302 is pressed by the conducting mechanism 303 to bulge downwards, the diaphragm 302 divides the interior of the shell 301 into a first cavity 305 and a second cavity 306 which are mutually sealed, the conducting mechanism 303 is positioned in the first cavity 305, the pressure taking pipe 304 is arranged at the bottom of the shell 301, the pressure taking pipe 304 is communicated with the second cavity 306, and the other end of the pressure taking pipe 304 is connected to the top of a storage tank device needing nitrogen sealing.
In this scheme, the diaphragm 302 of the diaphragm control assembly 3 has an upward thrust to the valve core 104 through the transmission mechanism 303, the lower pressing plate 203 of the pressure balance assembly 2 is under the action of the spring 202, and has a downward thrust to the valve core 104, under the normal state, the valve core 104 is in a balanced state, the sealing surface of the valve core 104 is against the valve seat 1031, no nitrogen is provided at this time, when the oil in the oil tank is continuously pumped, the nitrogen pressure above the oil tank is reduced, and the second cavity 306 of the diaphragm control assembly 3 is connected with the oil tank through the pressure taking pipe 304, so that the pressure of the second cavity 306 is reduced, the pressure difference between the second cavity 306 and the first cavity 305 is increased, and when the sum of the thrust generated by the spring thrust provided by the pressure balance assembly 2 and the pressure difference between the second cavity 306 and the first cavity 305 is greater than the thrust generated by deformation of the diaphragm 302, the deformation of the downward bulge of the diaphragm becomes larger, the valve core 104 moves downwards, the nitrogen inlet connecting pipe 101 is communicated with the nitrogen outlet connecting pipe 102, nitrogen is supplemented in the oil tank, when the nitrogen pressure in the oil tank is supplemented to a set value, the pressure difference between the first cavity 305 and the second cavity 306 is reduced, the deformation becomes smaller, the valve core 104 is pushed to move upwards to form a seal with the valve seat 1031, at the moment, nitrogen supply is stopped, the area of the valve core 302 is larger, the nitrogen pressure in the oil tank can be converted into an amplified pressure signal, the valve core can be flexibly controlled, the nitrogen pressure in the oil tank is ensured to be stable in a certain interval, the control is very sensitive, the pressure setting is accurate under a low set pressure, the opening and closing pressure difference range is small, the control fluctuation of the nitrogen pressure range is small, the flow capacity is large, the nitrogen is saved, and the cost is saved.
In practical application, in order to ensure that a good sealing effect is achieved between the valve core 104 and the valve seat 1031, an annular groove 106 is formed in the middle sealing surface of the valve core 104, an O-shaped sealing ring 105 is installed in the annular groove 106, a limiting sleeve 107 is sleeved outside the valve core 104 from bottom to top, the limiting sleeve 107 abuts against the positioning surface of the valve core 104, the upper end of the limiting sleeve 107 forms limiting shielding with at least half diameter height for the O-shaped sealing ring 105, the lower surface of the limiting sleeve 107 is limited by a clamp spring 108, and the valve seat 1031 abuts against the O-shaped sealing ring 105 when the valve is closed.
In practical application, in order to conveniently adjust the set pressure of the oil tank, the pressure balance assembly 2 is further provided with a nut 204, an adjusting screw 205 and an upper pressing plate 206, the upper end of the housing 201 is provided with a guide groove, the top of the guide groove is fixedly provided with the nut 204, the adjusting screw 205 is slidably arranged in the guide groove, the adjusting screw 205 is in threaded fit with the nut 204, the lower end of the adjusting screw 205 abuts against the upper pressing plate 206, and the spring 202 is arranged between the lower pressing plate 203 and the upper pressing plate 206. The adjusting screw 205 can be rotated to adjust the position of the upper pressing plate 206, and the compression amount of the spring is changed, so that the thrust value provided by the pressure balance assembly 2 to the valve core is adjusted, and finally the pressure threshold value of the pressure taking pipe required for opening the valve is changed.
In practical application, in order to prevent dust, the outer side of the portion of the adjusting screw 205 extending out of the housing 201 is sleeved with a dust cover 207.
In practical application, in order to prevent the position deviation of the upper pressing plate 206 and the lower pressing plate 203 from affecting the spring pressure, the upper pressing plate 206 and the lower pressing plate 203 are provided with bosses for limiting the spring 202.
In practical application, in order to ensure self-centering assembly of the upper pressing plate 206 and the screw 205, the bottom of the adjusting screw 205 is tapered, and a tapered groove is formed in the center of the mating surface of the upper pressing plate 206, and the taper angle of the tapered groove is slightly larger than that of the bottom of the screw.
In practical applications, in order to further adjust the pressure range, the housing 301 of the diaphragm control assembly 3 is in a detachable two-piece structure, the diaphragm 302 is detachably mounted between the two-piece housing 301 by a fastener, and the diaphragm 302 is provided with a plurality of replaceable different thickness specifications.
In summary, the high-precision nitrogen seal valve with low pressure control has the advantages of accurate pressure setting, small opening and closing pressure difference range, small control fluctuation of nitrogen pressure range, large circulation capacity, nitrogen saving and cost saving.
The foregoing has outlined and described the basic principles, features, and advantages of the present utility model. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical concept and features of the present utility model, and the present utility model can be implemented by those skilled in the art without limiting the scope of the utility model, therefore, all equivalent changes or modifications that are made according to the spirit of the present utility model should be included in the scope of the present utility model.
Claims (7)
1. A high-precision nitrogen seal valve controlled by low pressure is characterized in that: comprises a valve body component (1), a pressure balance component (2) and a diaphragm control component (3),
the valve body assembly (1) comprises a valve body (103), a valve core (104), a nitrogen inlet connecting pipe (101) and a nitrogen outlet connecting pipe (102); valve seat (1031) and valve core (104) are arranged in valve body (103), sealing surface matched with valve seat (1031) is arranged in the middle of valve core (104), mounting holes are arranged on the upper and lower surfaces of valve body (103), the upper end and lower end of valve core (104) are in sliding sealing connection with the mounting holes of valve body (103), valve seat (1031) and valve core (104) divide the interior of valve body (103) into upper cavity and lower cavity (1033), nitrogen inlet connecting pipe (101) and nitrogen outlet connecting pipe (102) are arranged on valve body (103), nitrogen inlet connecting pipe (101) is communicated with lower cavity (1033), nitrogen outlet connecting pipe (102) is communicated with upper cavity, nitrogen inlet connecting pipe (101) is connected to nitrogen supply pipeline, nitrogen outlet connecting pipe (102) is connected to the top of storage tank equipment needing nitrogen sealing,
the pressure balance assembly (2) comprises a shell (201), a spring (202) and a lower pressing plate (203), wherein the shell (201) is in sealing connection with the upper end of the valve body (103), the spring (202) and the lower pressing plate (203) are arranged in the shell (201), the upper surface of the lower pressing plate (203) is propped against the spring (202), the lower surface is propped against the upper end face of the valve core (104),
the diaphragm control assembly (3) comprises a shell (301), a diaphragm (302), a conducting mechanism (303) and a pressure taking pipe (304), wherein the lower ends of the shell (301) and the valve body (103) are in sealing connection, the diaphragm (302) is arranged in the shell (301), the conducting mechanism (303) is installed on the diaphragm (302), the uppermost end of the conducting mechanism (303) is abutted against the lower end face of the valve core (104), the diaphragm (302) is downwards raised under the pressure action of the conducting mechanism (303), the diaphragm (302) separates the interior of the shell (301) into a first cavity (305) and a second cavity (306) which are mutually sealed, the conducting mechanism (303) is located in the first cavity (305), the pressure taking pipe (304) is arranged at the bottom of the shell (301), the pressure taking pipe (304) is communicated with the second cavity (306), and the other end of the pressure taking pipe (304) is connected to the top of a storage tank device needing nitrogen sealing.
2. The low pressure controlled high precision nitrogen seal valve of claim 1, wherein: the sealing surface department is provided with ring channel (106) in the middle part of case (104), install O shape sealing washer (105) in ring channel (106), case (104) overcoat is equipped with stop collar (107), stop collar (107) are from upwards overlapping down to be established outside case (104), the locating surface of stop collar (107) and case (104) offsets, the upper end of stop collar (107) forms the spacing shielding of at least half diameter height to O shape sealing washer (105), the lower surface of stop collar (107) is spacing through jump ring (108), disk seat (1031) and O shape sealing washer (105) offset when the valve is closed.
3. The low pressure controlled high precision nitrogen seal valve of claim 1, wherein: the pressure balance assembly (2) is further provided with a nut (204), an adjusting screw (205) and an upper pressing plate (206), a guide groove is formed in the upper end of the shell (201), the nut (204) is fixedly arranged at the top of the guide groove, the adjusting screw (205) is slidably arranged in the guide groove, the adjusting screw (205) is in threaded fit with the nut (204), the lower end of the adjusting screw (205) abuts against the upper pressing plate (206), and the spring (202) is arranged between the lower pressing plate (203) and the upper pressing plate (206).
4. A low pressure controlled high precision nitrogen seal valve as claimed in claim 3 wherein: a dust cover (207) is sleeved on the outer side of the part, extending out of the shell (201), of the adjusting screw (205).
5. A low pressure controlled high precision nitrogen seal valve as claimed in claim 3 wherein: the upper pressing plate (206) and the lower pressing plate (203) are both provided with bosses for limiting the springs (202).
6. A low pressure controlled high precision nitrogen seal valve as claimed in claim 3 wherein: the bottom of the adjusting screw (205) is arranged to be conical, a conical groove is formed in the center of the matching surface of the upper pressing plate (206), and the cone angle of the conical groove is slightly larger than that of the bottom of the screw.
7. A low pressure controlled high precision nitrogen seal valve according to any one of claims 1-6, wherein: the shell (301) of the diaphragm control assembly (3) is of a detachable two-piece structure, the diaphragm (302) is detachably arranged in the middle of the two-piece shell (301) through a fastener, and the diaphragm (302) is provided with a plurality of replaceable different thickness specifications.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320094756.1U CN219317721U (en) | 2023-02-01 | 2023-02-01 | High-precision nitrogen seal valve controlled by low pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320094756.1U CN219317721U (en) | 2023-02-01 | 2023-02-01 | High-precision nitrogen seal valve controlled by low pressure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219317721U true CN219317721U (en) | 2023-07-07 |
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ID=87022680
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320094756.1U Active CN219317721U (en) | 2023-02-01 | 2023-02-01 | High-precision nitrogen seal valve controlled by low pressure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219317721U (en) |
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2023
- 2023-02-01 CN CN202320094756.1U patent/CN219317721U/en active Active
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