CN113531172A - Cryogenic axial flow type check valve - Google Patents
Cryogenic axial flow type check valve Download PDFInfo
- Publication number
- CN113531172A CN113531172A CN202010323613.4A CN202010323613A CN113531172A CN 113531172 A CN113531172 A CN 113531172A CN 202010323613 A CN202010323613 A CN 202010323613A CN 113531172 A CN113531172 A CN 113531172A
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- CN
- China
- Prior art keywords
- valve
- bushing
- flow guide
- guide body
- positioning step
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- 238000010079 rubber tapping Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims description 3
- 239000003949 liquefied natural gas Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000007769 metal material Substances 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/025—Check valves with guided rigid valve members the valve being loaded by a spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/005—Particular materials for seats or closure elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
- F16K47/16—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths the throttling member being a cone
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
A cryogenic axial flow check valve comprises a valve body, a valve core, a flow guide body, a front bushing, a fairing and a rear bushing, wherein a front support ring is arranged on the inner wall of the middle part of an inner cavity of the valve body; the inner wall of the rear part of the inner cavity of the valve body is provided with a positioning step which is in a conical ring shape, the flow guide body is arranged in the positioning step, the outer wall of the flow guide body has the same taper as the end face of the front end of the positioning step and is fixed with the end face of the front end of the positioning step, the rear end of the flow guide body is provided with a flow guide body central hole, and the rear bushing is fixed in the flow guide body central hole; the valve core consists of a valve clack and a valve shaft, the valve clack is sleeved outside the valve shaft, two ends of the valve shaft are respectively inserted into the front bushing and the rear bushing, and the valve shaft can slide in the front bushing and the rear bushing; the contact part of the front end surface of the valve clack and the inner cavity of the valve body is respectively provided with a valve clack sealing surface and a valve body sealing surface; a spring is arranged between the valve clack and the flow guiding body.
Description
Technical Field
The invention relates to a check valve, in particular to a cryogenic axial flow type check valve.
Background
The axial flow check valve has the characteristics of strong flow capacity, small flow resistance, no blockage when opened and closed, no impact when closed, reliable sealing and the like, and is widely applied to various industries. In recent years, with the increase of clean energy consumption in China, the demand of Liquefied Natural Gas (LNG) is increasing day by day. The need for cryogenic axial flow check valves for LNG transfer also increases. Conventional axial-flow type check valve generally uses in normal atmospheric temperature operating mode, and to low temperature operating modes such as LNG, the main shortcoming of traditional axial-flow type check valve has:
1. under the low-temperature working condition, the conventionally designed composite sealing structure cannot adapt to the low-temperature working condition, so that the sealing of the valve fails, and the satisfactory sealing effect cannot be achieved;
2. under the condition of low temperature, the metal material will generate low-temperature phase transformation, the austenite is transformed to the martensite, and simultaneously, due to the reason of low-temperature cold contraction, the deformation amount of different metal materials under the condition of low temperature is inconsistent due to different structures, so that the check valve is expected to obtain ideal sealing performance and simultaneously has ideal action performance difficulty.
Once the sealing performance of the check valve fails or the valve clack is jammed due to low-temperature uneven deformation, the check valve cannot be closed, the pump can be reversely rotated, and large loss can be caused.
Disclosure of Invention
In order to solve the above problems, the present invention provides the following solutions:
a cryogenic axial flow check valve comprises a valve body, a valve core and a flow guide body, and also comprises a front bushing, a fairing and a rear bushing, wherein a front support ring is arranged on the inner wall of the middle part of an inner cavity of the valve body; the inner wall of the rear part of the inner cavity of the valve body is provided with a positioning step, the positioning step is in a conical ring shape with the diameter gradually reduced from the rear end to the front end, the front end surface of the positioning step is a conical surface with the inner diameter gradually reduced from the front end to the rear end, the flow guide body is arranged in the positioning step, the outer wall of the flow guide body has the same conicity as that of the front end surface of the positioning step and is fixed with the front end surface of the positioning step, the rear end of the flow guide body is provided with a flow guide body central hole, and the rear bushing is fixed in the flow guide body central hole; the valve core consists of a valve clack and a valve shaft, the valve clack is sleeved outside the valve shaft, two ends of the valve shaft are respectively inserted into the front bushing and the rear bushing, and the valve shaft can slide in the front bushing and the rear bushing; the contact part of the front end surface of the valve clack and the inner cavity of the valve body is respectively provided with a valve clack sealing surface and a valve body sealing surface; a spring is arranged between the valve clack and the flow guiding body.
Furthermore, the valve clack sealing surface is formed by overlaying hard alloy on the valve clack, and the valve body sealing surface is formed by overlaying hard alloy in an inner cavity of the valve body.
Furthermore, the rear end of the front bushing extends outwards to form a front bushing clamping surface, and the front bushing clamping surface is clamped on the end surface of the rear end of the front support ring.
Furthermore, the front end of the rear bushing extends outwards to form a rear bushing clamping surface, and the rear bushing clamping surface is clamped on the front end face of the central hole of the flow guide body.
Furthermore, tapping is carried out on the outer wall of the front end of the front bushing, and fastening is carried out through screwing in of a locking nut; the fairing is fixedly connected with the front bushing through threads.
Furthermore, a locking device is arranged at the rear end of the rear bushing to fix the rear bushing and the flow guide body.
Furthermore, after the valve clack and the valve shaft are connected in a threaded connection mode, the valve clack and the valve shaft are fixed through welding.
The invention has the beneficial effects that:
1. the valve body is directly welded with the hard alloy in an overlaying mode to form a valve body sealing surface, the valve clack is welded with the hard alloy in the overlaying mode to form a valve clack sealing surface, the valve body sealing surface and the valve clack sealing surface are matched to form a metal sealing pair, metal sealing is achieved, the problem that the conventional soft sealing material cannot be used under a low-temperature condition is solved, and the problem of service life of the sealing pair under the low-temperature condition is solved.
2. The valve core is of a valve clack and valve shaft integrated structure, the phenomenon that a sealing surface and a valve shaft are not concentric due to assembly gaps of a conventional valve clack and a valve shaft is avoided, and the centering performance and the reliability of sealing are ensured.
3. The front support comprises a front bushing and a fairing which are connected with the front end of the valve body in a threaded manner, and the concentricity of the front support and the valve body is ensured in a conical surface matching manner; the guide body is arranged from the rear part of the valve body, is connected by threads and ensures the concentricity of the guide body and the valve body by a conical surface matching mode; the central hole of the flow guiding body is provided with a rear bushing matched with the central hole of the flow guiding body, and the rear bushing is provided with a locking device. The front end of the valve shaft is matched with the front bushing, the rear end of the valve shaft is matched with the rear bushing, and the concentricity of the sealing surface of the valve body and the sealing surface of the valve clack is ensured by the measures.
4. The front bushing is of a uniform thickness structure, and the matching part of the front bushing and the front end of the valve shaft is of a short matching length, so that the valve shaft and the front bushing are prevented from being jammed due to the fact that the matching length is too long in the movement process; the back bush sets up to even thickness structure, and the cooperation part of back bush and valve shaft rear end sets up to short cooperation length, avoids leading to valve shaft and back bush jam because of cooperation length overlength in the motion process.
Drawings
FIG. 1 is a schematic structural view of the present invention; .
In the figure: 1. a valve body; 2. a cowling; 3. locking the nut; 4. a front support ring; 5. a front bushing; 6. a valve core; 61. a valve flap; 62. a valve shaft; 7. a spring; 8. a flow conductor; 9. a rear bushing; 10. a locking device; 11. positioning a step; 12. a valve flap sealing surface; 13. a valve body sealing surface; 14. a front bushing clamping surface; 15. the back lining is clamped with the surface.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
Example 1: as shown in figure 1 of the drawings, in which,
a cryogenic axial flow check valve comprises a valve body 1, a valve core 6, a flow guide body 8, a front bushing 5, a fairing 2 and a rear bushing 9, wherein the inner wall of the middle part of an inner cavity of the valve body 1 is provided with a front support ring 4, the front half part of the inner wall of the front support ring 4 is in a conical surface shape with gradually reduced inner diameter from the front end to the middle part, the rear half part of the inner wall of the support ring 4 is in a ring shape with uniform inner diameter, the front bushing 5 is arranged in the front support ring 4, and the fairing 2 is sleeved at the front end of the front bushing 5; a positioning step 11 is arranged on the inner wall of the rear part of the inner cavity of the valve body 1, the positioning step 11 is in a conical ring shape with the diameter gradually reduced from the rear end to the front end, the front end surface of the positioning step 11 is a conical surface with the inner diameter gradually reduced from the front end to the rear end, the flow guide body 8 is arranged in the positioning step 11, the outer wall of the flow guide body 8 has the same conicity as the front end surface of the positioning step 11 and is fixed with the front end surface of the positioning step 11, the rear end of the flow guide body 8 is provided with a flow guide body central hole, and the rear bushing 9 is fixed in the flow guide body central hole; the valve core 6 consists of a valve clack 61 and a valve shaft 62, the valve clack 61 is sleeved outside the valve shaft 62, two ends of the valve shaft 62 are respectively inserted into the front bushing 5 and the rear bushing 9, and the valve shaft 62 can slide in the front bushing 5 and the rear bushing 9; the mutual contact part of the front end surface of the valve clack 61 and the inner cavity of the valve body 1 is respectively provided with a valve clack sealing surface 12 and a valve body sealing surface 13; a spring 7 is arranged between the valve clack 61 and the flow guiding body 8.
Further, the valve flap sealing surface 12 is formed by overlaying hard alloy on the valve flap 61, and the valve body sealing surface 13 is formed by overlaying hard alloy on the inner cavity of the valve body 1.
Furthermore, a front bushing clamping surface 14 extends outwards from the rear end of the front bushing 5, and the front bushing clamping surface 14 is clamped on the end surface of the rear end of the front support ring 4.
Furthermore, the front end of the rear bushing 9 extends outwards to form a rear bushing clamping surface 15, and the rear bushing clamping surface 15 is clamped on the front end face of the central hole of the flow guide body.
Further, tapping is carried out on the outer wall of the front end of the front bushing 5, and the front bushing is fastened through screwing in of a locking nut 3; the fairing 2 and the front bushing 5 are fixedly connected through threads.
Furthermore, a locking device 10 is arranged at the rear end of the rear bushing 9 to fix the rear bushing 9 and the flow guiding body 8.
Further, the valve flap 61 and the valve shaft 62 are connected by a screw connection and then fixed by welding.
The hard alloy is directly overlaid on the valve body 1 to form a valve body sealing surface 13, the hard alloy is overlaid on the valve clack 62 to form a valve clack sealing surface 12, the valve body sealing surface 13 and the valve clack sealing surface 12 are matched to form a metal sealing pair, metal sealing is realized, the problem that the conventional soft sealing material cannot be used under a low-temperature condition is solved, and the service life of the sealing pair under the low-temperature condition is prolonged.
The valve core 6 is of a structure integrating the valve clack 61 and the valve shaft 62, the situation that the sealing surface and the valve shaft are not concentric due to assembly gaps of the conventional valve clack and the valve shaft is avoided, and the sealing centering performance and the sealing reliability are ensured.
The front bushing 5 and the rear bushing 9 are arranged to form a front support and a rear support, the front support comprises the front bushing 5 and the fairing 2 which are connected with the front end of the valve body 1 in a threaded connection mode, and the concentricity of the front support and the valve body 1 is ensured in a conical surface matching mode; the guide body 8 is arranged from the rear part of the valve body 1, is connected by threads, and ensures the concentricity of the guide body 8 and the valve body 1 by a conical surface matching mode; the central hole of the flow guiding body is provided with a rear bushing 9 matched with the central hole of the flow guiding body, and the rear bushing 9 is provided with a locking device 10. The front end of the valve shaft 62 is matched with the front bushing 5, and the rear end of the valve shaft 62 is matched with the rear bushing 9, so that the concentricity of the valve body sealing surface 13 and the valve clack sealing surface 12 is ensured by the measures.
The front bushing 5 is of a uniform thickness structure, and the matching part of the front bushing 5 and the front end of the valve shaft 62 is of a short matching length, so that the valve shaft 62 and the front bushing 5 are prevented from being jammed due to the fact that the matching length is too long in the moving process; the back bush 9 sets up to even thickness structure, and the cooperation part of back bush 9 and valve shaft 62 rear end sets up to short cooperation length, avoids leading to valve shaft 62 and back bush 9 jam because of cooperation length overlength in the motion process.
Finally, it should be noted that the above-mentioned list is only a specific embodiment of the present invention. It is obvious that the present invention is not limited to the above embodiments, but many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (8)
1. The utility model provides an axial-flow type check valve of cryrogenic, includes valve body, case, baffle, its characterized in that: the inner wall of the middle part of the inner cavity of the valve body is provided with a front support ring, the front half part of the inner wall of the front support ring is in a conical surface shape with the inner diameter gradually reduced from the front end to the middle part, the rear half part of the inner wall of the support ring is in a circular ring shape with the uniform inner diameter, the front bushing is arranged in the front support ring, and the front end of the front bushing is sleeved with the fairing; the inner wall of the rear part of the inner cavity of the valve body is provided with a positioning step, the positioning step is in a conical ring shape with the diameter gradually reduced from the rear end to the front end, the front end surface of the positioning step is a conical surface with the inner diameter gradually reduced from the front end to the rear end, the flow guide body is arranged in the positioning step, the outer wall of the flow guide body has the same conicity as that of the front end surface of the positioning step and is fixed with the front end surface of the positioning step, the rear end of the flow guide body is provided with a flow guide body central hole, and the rear bushing is fixed in the flow guide body central hole; the valve core consists of a valve clack and a valve shaft, the valve clack is sleeved outside the valve shaft, two ends of the valve shaft are respectively inserted into the front bushing and the rear bushing, and the valve shaft can slide in the front bushing and the rear bushing; the contact part of the front end surface of the valve clack and the inner cavity of the valve body is respectively provided with a valve clack sealing surface and a valve body sealing surface; a spring is arranged between the valve clack and the flow guiding body.
2. A cryogenic axial flow check valve as claimed in claim 1 wherein: the valve clack sealing surface is formed by overlaying hard alloy on the valve clack, and the valve body sealing surface is formed by overlaying hard alloy in an inner cavity of the valve body.
3. A cryogenic axial flow check valve as claimed in claim 1 wherein: the front bushing clamping surface extends outwards from the rear end of the front bushing and is clamped on the end face of the rear end of the front support ring.
4. A cryogenic axial flow check valve as claimed in claim 1 wherein: the front end of the rear bushing extends outwards to form a rear bushing clamping surface, and the rear bushing clamping surface is clamped on the front end face of the central hole of the flow guide body.
5. A cryogenic axial flow check valve as claimed in claim 1 wherein: tapping threads on the outer wall of the front end of the front bushing, and fastening the front bushing by screwing in a locking nut; the fairing is fixedly connected with the front bushing through threads.
6. A cryogenic axial flow check valve as claimed in claim 1 wherein: and a locking device is arranged at the rear end of the rear bushing to fix the rear bushing and the flow guide body.
7. A cryogenic axial flow check valve as claimed in claim 1 wherein: and after the valve clack is connected with the valve shaft in a threaded connection mode, the valve clack is fixed by welding.
8. A cryogenic axial flow check valve as claimed in claim 1 wherein: the outer wall of the air guide sleeve is fixedly connected with the positioning step through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010323613.4A CN113531172A (en) | 2020-04-22 | 2020-04-22 | Cryogenic axial flow type check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010323613.4A CN113531172A (en) | 2020-04-22 | 2020-04-22 | Cryogenic axial flow type check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113531172A true CN113531172A (en) | 2021-10-22 |
Family
ID=78094125
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010323613.4A Pending CN113531172A (en) | 2020-04-22 | 2020-04-22 | Cryogenic axial flow type check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113531172A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104455585A (en) * | 2014-12-04 | 2015-03-25 | 圣博莱阀门有限公司 | Ultralow-temperature axial-flow type check valve |
| CN205026202U (en) * | 2015-04-30 | 2016-02-10 | 自贡新地佩尔阀门有限公司 | Axial -flow type check valve anti -drop anti -sticking hinders radome fairing structure |
-
2020
- 2020-04-22 CN CN202010323613.4A patent/CN113531172A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104455585A (en) * | 2014-12-04 | 2015-03-25 | 圣博莱阀门有限公司 | Ultralow-temperature axial-flow type check valve |
| CN205026202U (en) * | 2015-04-30 | 2016-02-10 | 自贡新地佩尔阀门有限公司 | Axial -flow type check valve anti -drop anti -sticking hinders radome fairing structure |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211022 |