CN216519728U - Low-stress guide pin shaft of forced sealing ball valve - Google Patents
Low-stress guide pin shaft of forced sealing ball valve Download PDFInfo
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- CN216519728U CN216519728U CN202123415397.5U CN202123415397U CN216519728U CN 216519728 U CN216519728 U CN 216519728U CN 202123415397 U CN202123415397 U CN 202123415397U CN 216519728 U CN216519728 U CN 216519728U
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Abstract
The utility model discloses a low-stress guide pin shaft of a forced sealing ball valve, which comprises a valve rod body, wherein two axially extending spiral grooves are arranged on the valve rod body, two ends of each spiral groove are respectively connected with a straight groove, the rotating directions of the two spiral grooves are opposite, one end of the valve rod body is connected with a threaded screw rod, and each spiral groove is composed of at least two spiral groove sections with different pitches. The valve rod structure of the forced sealing ball valve is improved, and the two or more sections of spiral grooves with different pitches are used for replacing the existing spiral groove with single constant pitch, so that the axial stroke of the spiral groove on the valve rod is shortened while the valve rod is prevented from obviously colliding with the guide pin shaft in the opening and closing rotating process, the operation time of the valve opening and closing process is effectively shortened, and the operation efficiency of the valve is improved.
Description
Technical Field
The utility model relates to the technical field of forced sealing ball valves, in particular to a low-stress guide pin shaft of a forced sealing ball valve.
Background
The forced sealing ball valve is a ball valve with a liftable valve rod. Under the normal condition, two valve rod grooves which are uniformly distributed at 180 degrees are arranged on a valve rod of the forced sealing ball valve, the valve rod grooves are right-handed spiral grooves with constant thread pitch, and two straight grooves are respectively connected at two ends of each spiral groove; the axial span of the spiral groove is 90 degrees, so that the opening and closing characteristics of the forced sealing ball valve 1/4 are guaranteed. The valve rod groove of the forced sealing ball valve is matched with the fixed guide pin shaft, and the valve rod can realize the actions of ascending, rotating ascending, descending, rotating descending and the like of the valve rod under the driving of the trapezoidal thread screw rod. The circumferential surface of the existing guide pin shaft is provided with a plurality of planes for matching with the side surface of the valve rod groove, wherein the planes comprise a plane matched with the side surface of the straight groove and a plane matched with the side surface of the spiral groove.
When the guide pin shaft with a plurality of planes is adopted to be matched with the valve rod groove, the abrasion is very easy to occur, and the reason is that: the side surface of the spiral groove is a spiral curved surface, and the spiral curved surface and the plane can not be completely attached, so that the side surface of the spiral groove can not be in surface contact with the plane of the guide pin shaft, only line contact can be realized between the spiral curved surface and the plane, and the contact part of the guide pin shaft and the side surface of the spiral groove is an intersection line between the planes. In practical application, even if a brand-new unused forced sealing ball valve is adopted, a very serious abrasion problem is found at the plane intersection line of the guide pin shaft of the forced sealing ball valve, which indicates that the valve starts to be abraded when being tested in a manufacturing factory, and the abrasion problem cannot be solved no matter how the valve is hardened at the part, the fundamental reason is that the contact area between the side surface of the spiral groove and the guide pin shaft approaches zero due to line contact, and extremely large contact stress is generated even if the valve is subjected to small acting force, and the contact stress is far greater than the strength of the contact part; and, because the guide pin axle is fixed in the valve stem lift in-process, the position that the guide pin axle contacts with the helicla flute side is fixed unchangeable, and the position that the helicla flute side contacts with the guide pin axle can change along with the lift of valve stem, therefore the last wearing and tearing that take place on the guide pin axle, what the helicla flute side of valve stem takes place is instantaneous wearing and tearing, this has just led to the degree of wear of guide pin axle to be more serious than the degree of wear and tear of helicla flute side.
In the working process of the forced sealing ball valve high-frequency switch, the abrasion of the guide pin shaft can be further aggravated, and the service performance of the forced sealing ball valve can be seriously influenced.
SUMMERY OF THE UTILITY MODEL
The technical problem to be solved by the utility model is as follows: the low-stress guide pin shaft of the forced sealing ball valve is long in service life.
In order to solve the technical problems, the utility model adopts the technical scheme that: the guide pin shaft of the forced sealing ball valve is matched with the matching structure of the valve rod, the forced sealing ball valve comprises a valve rod and a guide pin shaft, a valve rod groove is arranged on the valve rod and consists of a spiral groove and two straight grooves connected to the head end and the tail end of the spiral groove, the spiral groove spirally extends along the axial direction of the valve rod, the guide pin shaft extends into the valve rod groove and is in sliding fit with the valve rod groove, two groups of guide curved surfaces are respectively arranged on two side surfaces of the guide pin shaft, each guide curved surface consists of a first plane, a second plane and at least one spiral curved surface which are continuously arranged, and the spiral curved surfaces are matched with the side surfaces of the spiral groove; the two groups of guide curved surfaces are centrosymmetric by taking the central axis of the guide pin shaft as the center.
Further, the method comprises the following steps: the spiral groove is formed by connecting a first spiral groove section and a second spiral groove section, and the guide curved surface on the guide pin shaft is formed by a first plane, a second plane, a first spiral curved surface and a second spiral curved surface which are continuously arranged; the first spiral curved surface is matched with the side surface of the first spiral groove section, and the second spiral curved surface is matched with the side surface of the second spiral groove section.
Further, the method comprises the following steps: the first helical curved surface and the second helical curved surface have different pitches.
Further, the method comprises the following steps: the distance between two first spiral curved surfaces in the two groups of guide curved surfaces is equal to or less than the pitch of the first spiral groove section, and the distance between two second spiral curved surfaces is equal to or less than the pitch of the second spiral groove section.
Further, the method comprises the following steps: and the first spiral curved surface and the second spiral curved surface in the two groups of guide curved surfaces are uniformly distributed at 180 degrees on two side surfaces of the guide pin shaft.
The utility model has the beneficial effects that: according to the utility model, the structure of the low-stress guide pin shaft of the forced sealing ball valve is improved, two groups of guide curved surfaces are arranged on the circumferential surface of the guide pin shaft, each guide curved surface comprises a spiral curved surface matched with the side surface of the spiral groove in the valve rod groove, so that the guide pin shaft and the side surface of the spiral groove are in surface contact instead of line contact, and the spiral curved surfaces on the guide pin shaft can be attached to the side surfaces of the spiral groove, so that the contact area between the guide pin shaft and the spiral groove is greatly increased, the contact stress between the guide pin shaft and the spiral groove is effectively reduced, the abrasion condition of the guide pin shaft is greatly improved, the service life of the guide pin shaft is prolonged, and the normal use of the forced sealing ball valve is ensured.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a top isometric view of a guide pin shaft;
FIG. 3 is a bottom isometric view of a guide pin shaft;
FIG. 4 is a schematic view of the engagement of a guide pin with a first spiral groove segment;
FIG. 5 is a schematic view of the engagement of a guide pin with a second spiral groove segment;
labeled as: 100-valve rod, 200-guide pin shaft, 300-spiral groove, 310-first spiral groove section, 320-second spiral groove section, 400-straight groove, 500-guide curved surface, 510-first plane, 520-second plane, 530-first spiral curved surface and 540-second spiral curved surface.
Detailed Description
In order to facilitate understanding of the utility model, the utility model is further described below with reference to the accompanying drawings.
As shown in fig. 1, the low stress guide pin shaft of the forced sealing ball valve disclosed by the utility model comprises a valve rod 100 and a guide pin shaft 200, wherein a valve rod groove is arranged on the valve rod 100, the valve rod groove is composed of a spiral groove 300 and a straight groove 400, the spiral groove 300 is axially and spirally arranged on the circumferential surface of the valve rod 100 in an extending manner, the two straight grooves 400 are respectively connected with the head end and the tail end of the spiral groove 300, the guide pin shaft 200 is in sliding fit with the spiral groove 300, and when the forced sealing ball valve is opened and closed, the guide pin shaft 200 is fixed, so that the valve rod 100 is lifted under the guide effect of the guide pin shaft 200 in a manner of being matched with the guide of the valve rod groove; in the lifting process of the valve rod 100, when the guide pin shaft 200 is positioned in the spiral groove 300 of the valve rod groove, the valve rod 100 is lifted rotationally, and when the guide pin shaft 200 is positioned in the straight groove 400 of the valve rod groove, the valve rod 100 is lifted vertically. In order to reduce the contact stress between the spiral groove 300 and the guide pin shaft 200, the present invention improves the structure of the guide pin shaft 200 to change the line contact between the spiral groove 300 and the guide pin shaft 200 into the surface contact, in order to avoid the friction between the side surface of the spiral groove 300 and the circumferential surface of the guide pin shaft 200 during the lifting and lowering of the valve rod 100.
As shown in fig. 2 and 3, the guide pin 200 used in the present invention has two sets of guide curved surfaces 500 on the circumferential surface thereof, the two sets of guide curved surfaces 500 are respectively disposed on both sides of the circumferential surface of the guide pin 200, and the guide curved surfaces 500 are formed by connecting a first plane 510, a second plane 520 and at least one spiral curved surface, wherein the spiral curved surface is a spiral surface matched with the side surface of the spiral groove 300; the two groups of guiding curved surfaces 500 are centrosymmetric with the central axis of the guiding pin shaft 200 as the center, that is, are uniformly distributed on the circumferential surface of the guiding pin shaft 200 at 180 degrees. The guide pin shaft 200 is provided with the guide curved surface 500, and the first plane 510 and the second plane 520 of the guide curved surface 500 are matched with the straight groove 400 of the valve rod groove, and the spiral curved surface is matched with the side surface of the spiral groove 300; as shown in fig. 4 and 5, when the guide pin 200 and the spiral groove 300 slide relatively, the spiral curved surface of the guide pin 200 contacts with the side surface of the spiral groove 300, and the spiral curved surface contacts with the side surface of the spiral groove 300 to realize surface contact, so that the contact stress between the guide pin 200 and the spiral groove 300 is effectively reduced, the abrasion of the guide pin 200 is improved, and the service lives of the guide pin 200 and the valve body 100 are prolonged.
Considering that the axial stroke of the valve stem groove is too long, the sliding path between the guide pin 200 and the spiral groove 300 is too long, and the contact time between the two is too long to improve the wear of the guide pin 200. Therefore, the spiral groove 300 is provided as a two-stage structure, the spiral groove 300 is formed by connecting the first spiral groove stage 310 and the second spiral groove stage 320, and the spiral angles of the two spiral groove stages are different, so that the spiral angle of the second spiral groove stage 320 is larger than that of the first spiral groove stage 310, and the axial formation of the spiral groove 300 on the valve body 100 can be shortened. Correspondingly, the two spiral curved surfaces are arranged on the guide curved surface 500 of the guide pin shaft 200, so that the guide curved surface 500 consists of a first plane 510, a second plane 520, a first spiral curved surface 530 and a second spiral curved surface 540, and the first spiral curved surface 530 and the second spiral curved surface 540 in the two groups of guide curved surfaces 500 are uniformly distributed at 180 degrees on the two side surfaces of the guide pin shaft 200; the first helical curved surface 530 is matched with the side of the first spiral groove section 310, and the second helical curved surface 540 is matched with the side of the second spiral groove section 320.
Further, in the present invention, the pitches of the two helical curved surfaces are further improved, so that the pitches of the first helical curved surface 530 and the second helical curved surface 540 are different; the horizontal distance between the two first spiral curved surfaces 530 of the two sets of guiding curved surfaces 500 is equal to or less than the pitch of the first spiral groove section 310, and the horizontal distance between the two second spiral curved surfaces 540 is equal to or less than the pitch of the second spiral groove section 320.
Claims (5)
1. Force sealed ball valve low stress guide pin axle, including valve rod (100) and guide pin axle (200), be equipped with the valve rod groove on valve rod (100), the valve rod groove comprises helicla flute (300) and two straight flutes (400) of connection at helicla flute (300) end to end, and helicla flute (300) extend along valve rod (100) axial spiral, guide pin axle (200) stretch into the valve rod inslot and with valve rod groove sliding fit, its characterized in that: two side surfaces of the guide pin shaft (200) are respectively provided with a group of guide curved surfaces (500), each guide curved surface (500) consists of a first plane (510), a second plane (520) and at least one spiral curved surface which are continuously arranged, and the spiral curved surfaces are matched with the side surfaces of the spiral grooves (300); the two groups of guiding curved surfaces (500) are centrosymmetric by taking the central axis of the guiding pin shaft (200) as the center.
2. A low stress guide pin for a positive seal ball valve as defined in claim 1, wherein: the spiral groove (300) is formed by connecting a first spiral groove section (310) and a second spiral groove section (320), and the guide curved surface (500) on the guide pin shaft (200) is formed by a first plane (510), a second plane (520), a first spiral curved surface (530) and a second spiral curved surface (540) which are continuously arranged; the first helical curved surface (530) is matched with the side surface of the first helical groove section (310), and the second helical curved surface (540) is matched with the side surface of the second helical groove section (320).
3. A low stress guide pin for a positive seal ball valve as defined in claim 2, wherein: the first helical curved surface (530) and the second helical curved surface (540) have different pitches.
4. A low stress guide pin for a positive seal ball valve as defined in claim 2, wherein: the distance between two first spiral curved surfaces (530) in the two groups of guide curved surfaces (500) is equal to or less than the thread pitch of the first spiral groove section (310), and the distance between two second spiral curved surfaces (540) is equal to or less than the thread pitch of the second spiral groove section (320).
5. A low stress guide pin for a positive seal ball valve as defined in claim 2, wherein: and a first spiral curved surface (530) and a second spiral curved surface (540) in the two groups of guide curved surfaces (500) are uniformly distributed at 180 degrees on two side surfaces of the guide pin shaft (200).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123415397.5U CN216519728U (en) | 2021-12-31 | 2021-12-31 | Low-stress guide pin shaft of forced sealing ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123415397.5U CN216519728U (en) | 2021-12-31 | 2021-12-31 | Low-stress guide pin shaft of forced sealing ball valve |
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| Publication Number | Publication Date |
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| CN216519728U true CN216519728U (en) | 2022-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123415397.5U Active CN216519728U (en) | 2021-12-31 | 2021-12-31 | Low-stress guide pin shaft of forced sealing ball valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264160A (en) * | 2022-06-23 | 2022-11-01 | 中国船舶重工集团公司第七一九研究所 | Double-guide-rail driving device for valve |
-
2021
- 2021-12-31 CN CN202123415397.5U patent/CN216519728U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115264160A (en) * | 2022-06-23 | 2022-11-01 | 中国船舶重工集团公司第七一九研究所 | Double-guide-rail driving device for valve |
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