CN217029961U - Small-flow ultralow-temperature regulating valve for liquid helium temperature zone - Google Patents
Small-flow ultralow-temperature regulating valve for liquid helium temperature zone Download PDFInfo
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- CN217029961U CN217029961U CN202220775503.6U CN202220775503U CN217029961U CN 217029961 U CN217029961 U CN 217029961U CN 202220775503 U CN202220775503 U CN 202220775503U CN 217029961 U CN217029961 U CN 217029961U
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Abstract
The utility model discloses a small-flow ultralow temperature regulating valve for a liquid helium temperature zone, which comprises a valve body, wherein a valve core is arranged in the valve body; the valve body is connected with the valve body through an outer pipe, a valve rod is arranged in the outer pipe in a sliding mode, and a first end of the valve rod is connected with the valve core; an upper flange is arranged on the lower flange, the second end of the valve rod penetrates through the upper flange, at least two concentric sealing rings are arranged between the lower flange and the upper flange, and the valve rod is positioned on the inner sides of all the sealing rings; and the lower flange is provided with a gas channel, and the inner end of the gas channel is communicated with the space between two adjacent sealing rings. The utility model has the advantages that: the regulating valve has the advantages of good sealing performance, small minimum flow, good adjustability at small flow, easiness in operation, small size, simplicity in installation and small heat leakage, and can be sealed under negative pressure.
Description
Technical Field
The utility model relates to the field of low-temperature regulating valves, in particular to a low-flow ultralow-temperature regulating valve for a liquid helium temperature zone.
Background
A super-low temperature regulating valve is a valve which works in a low temperature medium. Among the prior art, chinese utility model patent that publication number is CN211039735U for example discloses an overall detachable type ultra-low temperature regulating valve, which comprises a valve body, the valve gap is installed to the upper end of valve body, the double-screw bolt nut is installed to the upper end of valve gap, the bottom of valve gap is provided with the gasket, the valve gap is through enclosing welding sealing connection with the valve body, the internally mounted of valve gap has the disk seat, gland nut is installed to the upper end of disk seat, the strengthening rib is evenly installed, per two to the one end of disk seat the centre of strengthening rib is provided with the throttle window, the internally mounted of disk seat has the connecting rod, the case is installed to the one end of connecting rod, actuating mechanism is installed to the upper end of disk seat, the disk seat is provided with the sealing ring with the centre of valve body, the sealing ring includes the fin.
With the rapid development of domestic economy, the demand and yield of low-temperature products are increasing day by day, and liquid oxygen, liquid nitrogen, liquid helium, liquefied natural gas and the like are widely applied. The temperature of liquid helium is-254 ℃, the temperature of liquid nitrogen is-196 ℃, the temperature of liquid oxygen is-183 ℃, the temperature of liquefied natural gas is-162 ℃, and a large number of ultralow-temperature valves are required for fractionation, storage and transportation of the products. The using amount of the ultra-low temperature adjusting valve is gradually increased, and the technical performance requirements of users on the ultra-low temperature adjusting valve are also gradually improved.
The existing low-temperature regulating valve has a high working temperature area, is generally used in a liquid nitrogen temperature area (77K), is sealed by using a filler, is complex to operate, poor in sealing performance, low in control precision, large in volume and heat leakage, and easy to frost when the valve rod is too short and is at a lower temperature. Moreover, the Kv value of the minimum flow of the existing low-temperature regulating valve is generally larger than 0.01, the requirement cannot be completely met, and the valve adjustability is poor under the condition of micro flow.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows:
the technical problem of poor sealing performance of the ultralow temperature regulating valve in the prior art is solved.
The utility model solves the technical problems through the following technical means:
a small-flow ultralow temperature regulating valve for a liquid helium temperature zone comprises a valve body, wherein a valve core is arranged in the valve body;
the valve body is connected with the valve body through an outer pipe, a valve rod is arranged in the outer pipe in a sliding mode, and a first end of the valve rod is connected with the valve core;
an upper flange is arranged on the lower flange, the second end of the valve rod penetrates through the upper flange, at least two concentric sealing rings are arranged between the lower flange and the upper flange, and the valve rod is positioned on the inner sides of all the sealing rings;
and the lower flange is provided with a gas channel, and the inner end of the gas channel is communicated with the space between two adjacent sealing rings.
When the small-flow ultralow-temperature regulating valve for the liquid helium temperature zone is actually applied, the regulating valve can be opened and closed by driving the valve rod through the peripheral power mechanism, fluid can enter and exit through the valve body, and the flow and the pressure of the valve can be controlled according to the moving distance of the valve rod. The sealing washer between lower flange and the last flange can realize the plane soft seal between the two to at governing valve in-service operation, the sealing washer can realize isolated air's purpose, and for prior art, this governing valve leakproofness is better, and this governing valve can seal under the negative pressure, and minimum flow is little and have better regulation nature under small flow, easily operation, and the volume is less, and the installation is simple, and the heat leakage is little.
Preferably, the valve rod is sleeved with a corrugated pipe, and two ends of the corrugated pipe are connected to the valve rod and the upper flange respectively.
The corrugated pipe plays a role in sealing and can be matched with the valve rod to move up and down by elasticity.
Preferably, two ends of the corrugated pipe are respectively welded with the valve rod and the upper flange.
Preferably, one end of the outer pipe close to the lower flange is a large-diameter end, the diameter of the large-diameter end is larger than that of the rest part of the outer pipe, and the corrugated pipe is located inside the large-diameter end.
Preferably, the valve rod comprises an upper valve rod and a lower valve rod, and the upper valve rod, the lower valve rod and the valve core are welded in sequence;
the bellows cover is established on last valve rod, and the both ends of bellows are connected to valve rod tip and upper flange respectively.
Preferably, the outer pipe is in sliding fit with the valve rod.
Optimized, all set up on valve body, the lower flange with outer pipe tip complex shrinkage pool, the both ends of outer tube insert respectively in the shrinkage pool that corresponds and with the shrinkage pool edge between the welding.
The outer pipe end part is positioned in the concave hole and connected with the valve body and the lower flange in a welding mode, so that the connection is firm and reliable, and the sealing performance is good.
Optimally, the position of contact between the valve body and the valve core is plated with nickel.
The nickel plating can enhance the wear resistance between the valve body and the valve core and prolong the service life of the valve body and the valve core.
Preferably, isolated gas can be introduced into the space between two adjacent sealing rings through the gas channel, and the isolated gas is helium.
High-purity helium is introduced into the space between two adjacent sealing rings through the gas passage, so that the air can be effectively isolated, and the sealing property is better.
Preferably, the outer disc is connected with the lower flange through threads, and the upper flange is clamped between the outer disc and the lower flange.
The utility model has the advantages that:
1. when the small-flow ultralow-temperature regulating valve for the liquid helium temperature zone is practically applied, the regulating valve can be opened and closed by driving the valve rod through the peripheral power mechanism, fluid can enter and exit through the valve body, and the flow and the pressure of the valve can be controlled according to the moving distance of the valve rod. The sealing washer between lower flange and the last flange can realize the soft seal in plane between the two to at governing valve in-service operation, the sealing washer can realize isolated air's purpose, and for prior art, this governing valve leakproofness is better, and this governing valve can seal under the negative pressure, and minimum flow is little and have better regulation nature under little flow, easily operation, and the volume is less, and the installation is simple, and the heat leakage volume is little.
2. The bellows has a sealing function and can be elastically matched with the valve rod to move up and down.
3. The outer pipe end part is positioned in the concave hole and connected with the valve body and the lower flange in a welding mode, so that the connection is firm and reliable, and the sealing performance is good.
4. The nickel plating can enhance the wear resistance between the valve body and the valve core and prolong the service life of the valve body and the valve core.
5. High-purity helium is introduced into the space between the two adjacent sealing rings through the gas channel, so that the air can be effectively isolated, and the sealing performance is better.
Drawings
FIG. 1 is a perspective view of a low flow ultra-low temperature regulator for a liquid helium temperature zone in an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a low flow ultra-low temperature regulator for a liquid helium temperature zone in an embodiment of the present invention;
wherein the content of the first and second substances,
a valve body-1;
a valve core-2;
a lower flange-3; a gas passage-31;
an outer tube-4; a large-diameter end-41;
a valve stem-5; an upper valve stem-51; a lower valve stem-52;
an upper flange-6;
a seal ring-7;
a bellows-8;
outer disc-9.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in figures 1 and 2, the small-flow ultralow-temperature regulating valve for the liquid helium temperature zone belongs to an internal and external coaxial straight-stroke angle valve and comprises a valve body 1, a valve core 2, a lower flange 3, an outer pipe 4, a valve rod 5, an upper flange 6, a sealing ring 7, a corrugated pipe 8 and an outer disc 9.
As shown in fig. 2, the bottom of the valve body 1 is provided with an inlet, the right side is provided with an outlet, the inlet and the outlet of the valve body 1 are both welded with corresponding low-temperature pipelines, the inner space of the valve body 1 is a valve cavity, and liquid helium enters the valve cavity from the inlet and flows out from the outlet after being regulated.
As shown in fig. 2, the valve core 2 is located in the valve body 1, the upper portion of the valve core 2 is in a step-type cylindrical shape with a small top and a large bottom, the lower portion of the valve core 2 is in a needle-like structure with a large top and a small bottom, the upper end of the needle-like structure and the cylindrical shape are transited through a truncated cone, the needle tip portion of the valve core 2 is inserted into an inlet at the bottom of the valve body 1, and the position of contact between the valve body 1 and the valve core 2 is plated with nickel. The upper end of the valve core 2 is welded with the lower end of the valve rod 5.
As shown in fig. 2, a flange is provided at the bottom of the lower flange 3, and mounting holes 32 are uniformly distributed in the circumferential direction on the flange.
As shown in fig. 2, the lower flange 3 is connected with the valve body 1 through an outer tube 4, a valve rod 5 is slidably arranged in the outer tube 4, and the outer tube 4 is in sliding fit with the valve rod 5. The length of both the outer tube 4 and the valve stem 5 is greater than 500 MM. The first end of the valve rod 5 is connected with the valve core 2, and the valve rod 5 is filled with heat insulation materials.
Specifically, as shown in fig. 2, a bellows 8 is sleeved on the valve rod 5, and two ends of the bellows 8 are respectively connected to the valve rod 5 and the upper flange 6. And two ends of the corrugated pipe 8 are respectively welded with the valve rod 5 and the upper flange 6.
Specifically, as shown in fig. 2, the valve rod 5 includes an upper valve rod 51 and a lower valve rod 52, the upper valve rod 51 is integrally of a solid cylindrical rod-shaped structure, a flange is arranged at the lower end of the upper valve rod 51 and is used for being welded with the lower end of the corrugated pipe 8, the lower valve rod 52 is of a slender cylinder structure, the lower end of the upper valve rod 51 is inserted into the upper end of the lower valve rod 52, the lower end of the lower valve rod 52 is inserted into the upper end of the valve core 2, and the upper valve rod 51, the lower valve rod 52 and the valve core 2 are sequentially welded; bellows 8 overlaps and establishes on last valve rod 51, and the both ends of bellows 8 are connected respectively supreme valve rod 51 tip and last flange 6, and is specific, on the flange of going up the valve rod 51 lower extreme and go up flange 6 bottom all be provided with 8 tip complex welding grooves of bellows, the both ends of bellows 8 and the welding groove welding that corresponds.
The insulation material is filled inside the lower valve stem 52, and the insulation material is prior art.
As shown in fig. 2, an end of the outer tube 4 near the lower flange 3 is a large diameter end 41 for accommodating the upper valve rod 51 and the bellows 8, the diameter of the large diameter end 41 is larger than that of the rest of the outer tube 4, the large diameter end 41 and the rest of the outer tube 4 are integrated, and the bellows 8 is located inside the large diameter end 41. Lower valve stem 52 is slidably engaged with the lower thin portion of outer tube 4, thereby guiding lower valve stem 52.
As shown in fig. 2, recessed holes matched with the end portions of the outer tubes 4 are formed in the valve body 1 and the lower flange 3, and two ends of each outer tube 4 are inserted into the corresponding recessed holes and welded to the edges of the recessed holes.
As shown in fig. 2, an upper flange 6 is arranged on the lower flange 3, the upper flange 6 is a disc structure with a hole in the middle, the second end of the valve rod 5 penetrates through the upper flange 6 and is in sliding fit with the upper flange 6, at least two concentric sealing rings 7 are arranged between the lower flange 3 and the upper flange 6, the number of the sealing rings 7 can be set according to actual requirements, in this embodiment, two ring grooves are formed in the top surface of the lower flange 3 for placing the sealing rings 7, and the valve rod 5 is located on the inner sides of all the sealing rings 7; the lower flange 3 is provided with a gas channel 31, as shown in fig. 2, the gas channel 31 is a right-angle channel, the inner end of the gas channel 31 leads to the space between two adjacent sealing rings 7, and an isolated gas can be introduced into the space between two adjacent sealing rings 7 through the gas channel 31, the isolated gas is helium gas, specifically, in actual application, when the regulating valve actually works, high-purity helium gas can be introduced into the regulating valve through the gas channel 31 to isolate air, and the sealing effect is good.
As shown in fig. 2, the outer disk 9 is screwed to the lower flange 3, and the upper flange 6 is held between the outer disk 9 and the lower flange 3.
Furthermore, the pneumatic control valve further comprises a pneumatic actuator and a valve positioner (not shown in the figure), wherein the pneumatic actuator and the valve positioner are both in the prior art, and can be installed on other parts above the regulating valve or directly connected with the regulating valve. The pneumatic actuator may adopt a driving component such as an air cylinder to connect with the top end of the upper valve rod 51, so as to drive the upper valve rod 51 to move up and down, and the working stroke, flow characteristics and optimal working state of the valve are determined according to specific requirements. The pneumatic actuator changes the stroke of the upper valve rod 51 according to the control signal so as to drive the valve core 2 to move axially, further change the flow cross section area of the valve core 2 and the valve body 1, and achieve the purpose of controlling parameters such as flow, opening and closing, pressure and the like of the valve.
The working principle is as follows:
as shown in FIG. 2, when the small-flow ultralow temperature regulating valve for the liquid helium temperature zone is practically used, the valve rod 5 is driven by an external power mechanism to open and close the regulating valve, fluid can enter and exit through the valve body 1, and the flow and the pressure of the valve can be controlled according to the moving distance of the valve rod 5. When the valve works, the bottom of the low-temperature medium is liquid, and the top of the low-temperature medium is affected by heat leakage to evaporate the liquid into gas. Lower flange 3 and last sealing washer 7 between the flange 6 can realize the soft seal in plane between the two, and at governing valve in-service operation, let in isolated gas to the space between two adjacent sealing washers 7 through gas passage 31, and then can realize isolated air's purpose, for prior art, this governing valve leakproofness is better, this governing valve can seal under the negative pressure, minimum flow is little and have better regulation nature under small flow, easy operation, small in size, simple installation, the heat leakage is little.
The bellows 8 has a sealing function and can be elastically matched with the up-and-down movement of the valve rod. The end part of the outer tube 4 is positioned in the concave hole and is connected with the valve body 1 and the lower flange 3 in a welding mode, so that the connection is firm and reliable, and the sealing property is good. The nickel plating can enhance the wear resistance between the valve body 1 and the valve core 2 and prolong the service life of the valve body. High-purity helium is introduced into the space between two adjacent sealing rings 7 through the gas passage 31, so that the air can be effectively isolated, and the sealing property is better.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A low flow ultra-low temperature regulating valve for liquid helium temperature zone which characterized in that: the valve comprises a valve body (1), wherein a valve core (2) is arranged in the valve body (1);
the valve body (1) is connected with the lower flange (3) through an outer pipe (4), a valve rod (5) is arranged in the outer pipe (4) in a sliding mode, and the first end of the valve rod (5) is connected with the valve core (2);
an upper flange (6) is arranged on the lower flange (3), the second end of the valve rod (5) penetrates through the upper flange (6), at least two concentric sealing rings (7) are arranged between the lower flange (3) and the upper flange (6), and the valve rod (5) is positioned on the inner sides of all the sealing rings (7);
and a gas channel (31) is arranged on the lower flange (3), and the inner end of the gas channel (31) is communicated with the space between two adjacent sealing rings (7).
2. The low flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 1, characterized in that: the corrugated pipe (8) is sleeved on the valve rod (5), and two ends of the corrugated pipe (8) are connected to the valve rod (5) and the upper flange (6) respectively.
3. The small flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 2, characterized in that: and two ends of the corrugated pipe (8) are respectively welded with the valve rod (5) and the upper flange (6).
4. The low flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 2, characterized in that: one end of the outer pipe (4) close to the lower flange (3) is a large-diameter end (41), the diameter of the large-diameter end (41) is larger than that of the rest part of the outer pipe (4), and the corrugated pipe (8) is located inside the large-diameter end (41).
5. The low flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 4, characterized in that: the valve rod (5) comprises an upper valve rod (51) and a lower valve rod (52), and the upper valve rod (51), the lower valve rod (52) and the valve core (2) are welded in sequence;
bellows (8) are established on last valve rod (51) in the cover, and the both ends of bellows (8) are connected respectively to last valve rod (51) tip and upper flange (6).
6. The small flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 1, characterized in that: the outer pipe (4) is in sliding fit with the valve rod (5).
7. The low flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 1, characterized in that: all set up on valve body (1), lower flange (3) with outer tube (4) tip complex shrinkage pool, the both ends of outer tube (4) insert respectively corresponding shrinkage pool in and with weld between the shrinkage pool edge.
8. The low flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 1, characterized in that: and the position where the valve body (1) and the valve core (2) are contacted is plated with nickel.
9. The low flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 1, characterized in that: isolated gas can be introduced into the space between two adjacent sealing rings (7) through the gas channel (31), and the isolated gas is helium.
10. The low flow ultra-low temperature regulating valve for liquid helium temperature zone of claim 1, characterized in that: the flange structure is characterized by further comprising an outer disc (9), the outer disc (9) is in threaded connection with the lower flange (3), and the upper flange (6) is clamped between the outer disc (9) and the lower flange (3).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022207375037 | 2022-03-31 | ||
| CN202220737503 | 2022-03-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217029961U true CN217029961U (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220775503.6U Active CN217029961U (en) | 2022-03-31 | 2022-04-02 | Small-flow ultralow-temperature regulating valve for liquid helium temperature zone |
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| CN (1) | CN217029961U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704644A (en) * | 2022-03-31 | 2022-07-05 | 中国科学院合肥物质科学研究院 | Small-flow ultralow-temperature regulating valve for liquid helium temperature zone |
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2022
- 2022-04-02 CN CN202220775503.6U patent/CN217029961U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114704644A (en) * | 2022-03-31 | 2022-07-05 | 中国科学院合肥物质科学研究院 | Small-flow ultralow-temperature regulating valve for liquid helium temperature zone |
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