CN209909249U - Low-temperature axial flow type check valve - Google Patents
Low-temperature axial flow type check valve Download PDFInfo
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- CN209909249U CN209909249U CN201920856787.XU CN201920856787U CN209909249U CN 209909249 U CN209909249 U CN 209909249U CN 201920856787 U CN201920856787 U CN 201920856787U CN 209909249 U CN209909249 U CN 209909249U
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- external thread
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- check valve
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Abstract
The utility model relates to a low temperature valve technical field, concretely relates to axial-flow type check valve under low temperature operating mode. The tail part of a flow guide part of the low-temperature axial flow check valve is provided with an external thread section, and the external thread section is in threaded fit with the wall of the valve cavity; the external thread fixing piece is arranged at the rear end of the flow guide component and is abutted against the flow guide component; at least one of the external thread section of the flow guide component and the external thread fixing piece is radially and eccentrically provided with an eccentric structure, and the self-locking of the flow guide component is ensured through the eccentric nut design of the external thread section and the external thread fixing piece, so that the assembled flow guide component cannot be loosened in the use process in a low-temperature state. And the guide component and the valve body are manufactured separately, so that the casting process is good, the casting forming precision is high, and the processing and the manufacturing are convenient.
Description
Technical Field
The utility model relates to a low temperature valve technical field, concretely relates to axial-flow type check valve under low temperature operating mode.
Background
The traditional middle-small caliber axial flow check valve generally adopts a disc structure and has the function of preventing media in a pipeline from flowing backwards. The existing axial-flow check valve is provided with a flow guide part (flow guide cone) in a valve cavity, the flow guide part can be installed on a valve body by means of threads at the tail part, the structure can be used for normal-temperature media, but for ultra-low-temperature media such as LNG (liquefied natural gas), the cold shrinkage of materials under a low-temperature state is inconsistent due to the fact that the wall thickness of a structural member of the valve is uneven, the thread installation structure has the problem that the structure is loose under the low-temperature working condition, and meanwhile, the positioning is inaccurate due to the fact.
In order to solve the problem of the loose structure, the check valve structure with the integrally formed flow guide part and the valve body is arranged in the prior art, the check valve structure has higher requirements on the casting process of the valve body, and the forming precision of the flow guide part and the valve body is difficult to ensure in actual production.
SUMMERY OF THE UTILITY MODEL
Therefore, the to-be-solved technical problem of the present invention is to overcome the loose defect of the stop valve diversion component in the prior art, thereby providing a low temperature axial flow check valve.
In order to solve the technical problem, the utility model discloses a technical scheme as follows:
the utility model provides a low temperature axial-flow type check valve, it includes:
a valve body having a valve cavity therein, the valve cavity extending in an axial direction;
a valve seat disposed within the valve cavity;
the flow guide component is provided with an axial through hole, the tail part of the flow guide component is provided with an external thread section, and the external thread section is in threaded fit with the wall of the valve cavity; the external thread section is provided with a circular groove;
a valve plate assembly reciprocally movable along the axial through hole to open or close the check valve;
the external thread fixing piece is arranged at the rear end of the flow guide component and is abutted against the flow guide component, the external thread fixing piece is in threaded fit with the wall of the valve cavity, an annular bulge is arranged at one end of the external thread fixing piece abutted against the flow guide component, and the annular bulge is suitable for being inserted into the circular groove;
or the external thread section is provided with an annular bulge, one end of the external thread fixing piece, which is abutted against the flow guide component, is provided with a circular groove, and the annular bulge is suitable for being inserted into the circular groove;
wherein at least one of the circular groove and the annular protrusion is radially eccentrically disposed.
In the above low-temperature axial-flow check valve, the valve plate assembly includes a valve plate; the guide shaft is fixedly connected with the valve plate and penetrates through the axial through hole; and the elastic piece is arranged between the valve plate and the guide shaft.
In the low-temperature axial flow check valve, the valve seat and the valve body are integrally formed.
In the above low-temperature axial flow type check valve, the valve seat surface has a valve seat sealing surface.
In the low-temperature axial-flow check valve, the surface of the valve plate matched with the valve seat is provided with a flow guide cone structure.
In the low-temperature axial-flow check valve, the elastic member is a pre-compression spring. Preferably, the pre-pressure spring is a double coil spring.
In the low-temperature axial-flow check valve, the outer wall of the valve body is cylindrical.
The utility model discloses technical scheme has following advantage:
1. the utility model provides a low-temperature axial flow check valve, the tail part of a flow guide part of which is provided with an external thread section which is matched with the wall thread of a valve cavity; the external thread fixing piece is arranged at the rear end of the flow guide component and is abutted against the flow guide component; at least one of the external thread section of the flow guide component and the external thread fixing piece is radially and eccentrically provided with an eccentric structure, and the self-locking of the flow guide component is ensured through the eccentric nut design of the external thread section and the external thread fixing piece, so that the assembled flow guide component cannot be loosened in the use process in a low-temperature state. And the guide component and the valve body are manufactured separately, so that the casting process is good, the casting forming precision is high, and the processing and the manufacturing are convenient.
2. The utility model provides a low temperature axial-flow type check valve, disk seat and valve body integrated into one piece, this fixed disk seat set up the mode, satisfy the adaptability problem of ultra-low temperature medium such as LNG, can not appear the lax problem of structure under the end temperature operating mode, guarantee that sealed face does not take place to leak.
3. The utility model provides a low temperature axial-flow type check valve, its valve plate with that one side of disk seat complex has water conservancy diversion cone structure, and the flow state emulation valve clack line type of this water conservancy diversion awl accords with fluidic law of motion, and the flow resistance is little, can postpone the boundary layer separation. For a high-pressure-grade valve, the medium flow velocity is generally higher when the valve is fully opened, and the flow velocity at the center of the valve clack is the lowest according to the simulation analysis of a fluid trace.
4. The utility model provides a low temperature axial-flow type check valve, its valve plate pre-compaction spring are double helical spring structure, and double spring forms accurate positioning on arranging the spring holder of water conservancy diversion awl in. The two springs have different spring stiffness, and through accurate calculation and finite element analysis, the valve is ensured to be opened under low dielectric pressure, the requirement of opening the valve under low pressure difference is met, and the valve clack can be pushed into the valve seat by the springs under the action of no reverse dielectric pressure. Meanwhile, the springs with different stiffness have the shock absorption function when the system differential pressure pulsates, and the service lives of the protection valve and the system are prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a cross-sectional view of a cryogenic axial flow check valve provided in an embodiment of the present invention;
fig. 2 is a cross-sectional view of a flow guide member provided in an embodiment of the present invention;
fig. 3 is a cross-sectional view of an external thread fastener provided in embodiment 1 of the present invention.
Description of reference numerals:
1-a valve body; 11-a valve cavity; 12-a valve seat; 121-valve seat sealing surface; 2-a flow guide component; 21-external thread section; 211-circular grooves; 22-axial through hole; 3-a valve plate; 4-a guide shaft; 5-an elastic member; 6-external thread fixing piece.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1 to 3, the present embodiment provides a low temperature axial flow check valve, which includes:
the valve comprises a valve body 1, a valve cavity 11 is arranged in the valve body 1, and the valve cavity 11 extends along the axial direction;
a valve seat 12 arranged in the valve cavity 11;
the flow guide component 2 is provided with an axial through hole 22, the tail part of the flow guide component 2 is provided with an external thread section 21, and the external thread section 21 is in threaded fit with the wall of the valve cavity 11; the external thread section 21 is provided with a circular groove 211, and the center of the circular groove 211 is coincided with the axis of the flow guide part 2;
a valve plate assembly reciprocally movable along the axial through hole 22 to open or close the check valve; the valve plate assembly comprises a valve plate 3; the guide shaft 4 is fixedly connected with the valve plate 3, and the guide shaft 4 is arranged in the axial through hole 22 in a penetrating manner; an elastic member 5 provided between the valve plate 3 and the guide shaft 4;
the external thread fixing piece 6 is arranged at the rear end of the flow guide component 2 and is abutted against the flow guide component 2, the external thread fixing piece 6 is in threaded fit with the wall of the valve cavity 11, an annular bulge 61 is arranged at one end of the external thread fixing piece 6 abutted against the flow guide component 2, and the annular bulge 61 is suitable for being inserted into the circular groove 211; and the center of the circular protrusion is eccentric to the axis of the flow guide part 2, as shown in fig. 3, that is, the circular protrusion 61 is radially and eccentrically arranged. The radial eccentric arrangement means that the center line of the conical surface does not coincide with the center line of the protrusion.
In the low-temperature axial-flow check valve provided by the embodiment, the tail part of the flow guide part is provided with an external thread section, and the external thread section is in threaded fit with the wall of the valve cavity; the external thread fixing piece is arranged at the rear end of the flow guide component and is abutted against the flow guide component; the external thread fixing piece of the flow guide component is radially and eccentrically provided with an eccentric structure, and the self-locking of the flow guide component is ensured through the design of eccentric nuts of the flow guide component and the external thread fixing piece, so that the assembled flow guide component cannot be loosened in the use process in a low-temperature state. And the guide component and the valve body are manufactured separately, so that the casting process is good, the casting forming precision is high, and the processing and the manufacturing are convenient.
Alternatively, in the low temperature axial flow type check valve described above, the valve seat 12 is integrally formed with the valve body 1. The valve body is a cylindrical valve body, can be cast or forged, and the manufacturing process is greatly optimized. The integrated valve seat and the venturi runner port are designed, the fluid resistance is small, the valve seat sealing surface is directly processed and formed after surfacing, the assembling link of the valve seat and the valve body is omitted, the leakage caused by looseness between the valve seat and the valve body is thoroughly eliminated, the leakage risk possibly caused by uneven material shrinkage particularly under the low-temperature working condition is solved, the adaptability problem of ultra-low-temperature media such as LNG (liquefied natural gas) is solved, and the problem of loose structure cannot occur under the low-temperature working condition.
Alternatively, in the low temperature axial flow type check valve, the valve seat 12 surface has a valve seat sealing surface 121. The valve seat sealing surface is directly processed and formed after surfacing, the assembling link of the valve seat and the valve body is omitted, leakage caused by looseness between the valve seat and the valve body is thoroughly eliminated, and the leakage risk possibly caused by uneven material shrinkage particularly under the low-temperature working condition is eliminated.
Alternatively, in the low-temperature axial-flow type check valve, the surface of the valve plate 3 matched with the valve seat 12 is provided with a flow guide cone structure. The flow state simulation valve clack line type with the flow guide cone, which meets the practical engineering application, is designed according to the theory of superposition of the constant-intensity line source and the uniform flow, accords with the motion rule of fluid, has small flow resistance, and can delay boundary layer separation. For a high-pressure-grade valve, the medium flow velocity is generally higher when the valve is fully opened, and the flow velocity at the center of the valve clack is the lowest according to the simulation analysis of a fluid trace. The guide shaft 4 is designed as a long guide shaft, the long guide handle of the valve plate enables the valve plate to be in a long supporting state in the working process, and the weight of the extending part of the valve rod (the large caliber can be added with a balance block) can balance the weight of the head of the valve plate, so that the valve clack is kept in sealing fit with the valve seat. The valve plate guide part is hardened, the fit clearance is small, and the operation is reliable. The valve plate is provided with a sealing surface which is designed in a spherical surface mode, and hard alloy is subjected to surfacing welding, so that the valve plate is good in positioning characteristic and high in repeated positioning precision.
Alternatively, in the low-temperature axial-flow type check valve, the elastic member 5 is a pre-compression spring; preferably, the pre-pressure spring is a double coil spring. The double spiral spring is arranged on the spring seat of the flow guide cone to form accurate positioning. The two springs have different spring stiffness, the valve is ensured to be opened under low dielectric pressure through accurate calculation and finite element analysis, the requirement of opening the valve under low pressure difference is met, and the valve plate can be pushed into the valve seat by the springs under the action of no reverse dielectric pressure. Meanwhile, the springs with different stiffness have the shock absorption function when the system differential pressure pulsates, and the service lives of the protection valve and the system are prolonged.
In addition, the valve sealing structure is a conical surface-to-spherical surface seal, the valve seat sealing surface is a small attack angle conical surface, the valve clack sealing surface is a centrosymmetric spherical surface, the positioning is reliable, even if the center of the valve plate is slightly eccentric to the center of the valve seat, the structure of the spherical surface-to-conical surface can also make up for the manufacturing error, and good sealing is formed under the combined action of medium pressure and spring pretightening force.
Optionally, in the low-temperature axial-flow check valve, the outer wall of the valve body is cylindrical, the appearance of the cylindrical valve body is adopted, the structure is simple, the valve body can be forged and cast, and the manufacturing process is greatly optimized.
Example 2
The present embodiment provides a low temperature axial flow check valve, which is different from the low temperature axial flow check valve provided in embodiment 1 in that the circular groove 211 of the external threaded section 21 is radially and eccentrically disposed from the external threaded section 21; the circle center of the annular bulge is superposed with the axis of the flow guide component 2. The annular bulge is eccentrically matched with the circular groove, and the self-locking fixation of the flow guide part is also realized.
Example 3
The present embodiment provides a low-temperature axial flow check valve, which is different from the low-temperature axial flow check valve provided in embodiment 1 in that the circular groove 211 of the external threaded section 21 and the external threaded section 21 are both radially and eccentrically disposed; the circle center of the annular bulge is eccentric with the axis of the flow guide component 2. The annular bulge is eccentrically matched with the circular groove, and the self-locking fixation of the flow guide part is also realized.
Example 4
The present embodiment provides a low-temperature axial flow check valve, which is different from the low-temperature axial flow check valves provided in embodiments 1 to 3, in that the external thread section has an annular protrusion, a circular groove is provided at one end of the external thread fixing member abutting against the flow guide member, and the annular protrusion is adapted to be inserted into the circular groove; wherein at least one of the circular groove and the annular protrusion is radially eccentrically disposed. The annular bulge is eccentrically matched with the circular groove, and the self-locking fixation of the flow guide part is also realized.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (8)
1. A cryogenic axial flow check valve comprising:
a valve body (1) having a valve cavity (11) therein, the valve cavity (11) extending in an axial direction;
a valve seat (12) arranged in the valve cavity (11);
the flow guide component (2) is provided with an axial through hole (22), the tail part of the flow guide component (2) is provided with an external thread section (21), and the external thread section (21) is in threaded fit with the wall of the valve cavity (11); the external thread section (21) is provided with a circular groove (211);
a valve plate assembly reciprocally movable along said axial through hole (22) to open or close said check valve;
the external thread fixing piece (6) is arranged at the rear end of the flow guide component (2) and is abutted against the flow guide component (2), the external thread fixing piece (6) is in threaded fit with the wall of the valve cavity (11), an annular bulge (61) is arranged at one end of the external thread fixing piece (6) abutted against the flow guide component (2), and the annular bulge is suitable for being inserted into the circular groove (211);
or the external thread section (21) is provided with an annular bulge, one end of the external thread fixing piece (6) which is abutted to the flow guide component (2) is provided with a circular groove, and the annular bulge is suitable for being inserted into the circular groove;
wherein at least one of the circular groove and the annular protrusion is radially eccentrically disposed.
2. The cryogenic axial flow check valve of claim 1 wherein the valve plate assembly comprises, a valve plate (3); the guide shaft (4) is fixedly connected with the valve plate (3), and the guide shaft (4) is arranged in the axial through hole (22) in a penetrating manner; an elastic member (5) provided between the valve plate (3) and the guide shaft (4).
3. The cryogenic axial flow check valve of claim 1 wherein the valve seat (12) is integrally formed with the valve body (1).
4. A cryogenic axial flow check valve according to claim 3 wherein the valve seat (12) surface has a seat sealing surface (121).
5. The cryogenic axial flow check valve of claim 2 wherein the face of the valve plate (3) that mates with the valve seat (12) has a inducer configuration.
6. The cryogenic axial flow check valve of claim 2 wherein the resilient member (5) is a pre-compression spring.
7. The low temperature axial flow check valve of claim 6, wherein the pre-load spring is a double coil spring.
8. The cryogenic axial flow check valve of claim 1 wherein the outer wall of the valve body is cylindrical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920856787.XU CN209909249U (en) | 2019-06-06 | 2019-06-06 | Low-temperature axial flow type check valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920856787.XU CN209909249U (en) | 2019-06-06 | 2019-06-06 | Low-temperature axial flow type check valve |
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| CN209909249U true CN209909249U (en) | 2020-01-07 |
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| CN201920856787.XU Active CN209909249U (en) | 2019-06-06 | 2019-06-06 | Low-temperature axial flow type check valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118274A (en) * | 2019-06-06 | 2019-08-13 | 慎江阀门有限公司 | A kind of low temperature axial flow type check valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110118274A (en) * | 2019-06-06 | 2019-08-13 | 慎江阀门有限公司 | A kind of low temperature axial flow type check valve |
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