CN216745851U - NPT pipe thread external screw thread major diameter detects ring gage - Google Patents
NPT pipe thread external screw thread major diameter detects ring gage Download PDFInfo
- Publication number
- CN216745851U CN216745851U CN202123260733.3U CN202123260733U CN216745851U CN 216745851 U CN216745851 U CN 216745851U CN 202123260733 U CN202123260733 U CN 202123260733U CN 216745851 U CN216745851 U CN 216745851U
- Authority
- CN
- China
- Prior art keywords
- step surfaces
- quincunx
- thread
- npt pipe
- pipe thread
- 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.)
- Active
Links
Images
Landscapes
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The utility model provides a NPT pipe thread external screw thread major diameter detects ring gage, wholly is short cylinder, includes: a bottom surface, a conical hole, a quincunx step surface, an axe-shaped step surface and a cylindrical surface; the middle part of the ring gauge is a conical hole, three quincunx step surfaces are uniformly distributed on the end surface of a small hole of the conical hole, three axe-shaped step surfaces are formed between adjacent quincunx step surfaces, and the heights of the three quincunx step surfaces and the three axe-shaped step surfaces from six step surfaces to the bottom surface are different. The taper of the conical hole is the same as the taper of the measured NPT pipe thread, and is 1: 16. the diameter of the large hole end of the conical hole is a standard size for calculating and determining the distance from the three quincunx step surfaces and the three axe-shaped step surfaces to the bottom surface. The utility model discloses simple structure, convenient to use, measurement are accurate. The large diameter and the taper of the external thread of the NPT pipe thread can be ensured to be completely qualified, and reliable conditions are provided for solving the three-leakage faults of oil leakage, water leakage and air leakage at the thread part of the NPT pipe.
Description
Technical Field
The utility model belongs to the check out test set field relates to a measuring tool, especially relates to a NPT pipe thread external screw thread major diameter detects ring gage.
Background
As is well known, the machine manufacturing industry often uses NPT pipe thread seals. The NPT thread is an American standard 60-degree taper pipe thread and is divided into a general sealed cylindrical pipe thread and a general sealed conical pipe thread, and the matching mode is a 'taper/cone' matching mode and a 'column/taper' matching mode. Because the NPT pipe thread is in transition fit, during installation, fillers such as locking agent, pipe thread sealant or precoating glue are required to be coated on the NPT pipe thread to close the gap between the screwed parts of the thread, thereby ensuring the sealing property. When the diameter of a blank for manufacturing the NPT pipe thread external thread is out of tolerance to cause the large diameter of the NPT pipe thread to be too small, or the taper of the external thread is unqualified, the NPT pipe thread ring gauge detects the pitch diameter of the NPT pipe thread external thread, so the NPT pipe thread ring gauge detects the NPT pipe thread external thread, and the NPT pipe thread external thread is still possibly qualified. However, because the normal glue application amount is not enough to close the gap between the screwed parts, the three-leakage faults of oil leakage, water leakage and air leakage often occur.
In the prior art, no special measuring tool for measuring the taper and the major diameter of the external thread of the NPT pipe thread exists.
In summary, in order to solve the problem of measuring the taper and the major diameter of the external thread of the NPT pipe in practical application, a NPT pipe thread major diameter detection ring gauge is designed, and is specially used for detecting the taper and the major diameter of the external thread of the NPT pipe thread, so that the manufacturing quality of the external thread is checked, and the problem of 'three leaks' is solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a simple structure, convenient to use, measure accurate NPT pipe thread external screw thread major diameter and detect ring gage.
The utility model discloses can reach above-mentioned purpose through following technical scheme: the utility model provides a NPT pipe thread external screw thread major diameter detects ring gage, wholly is short cylinder, includes: a bottom surface, a conical hole, a quincunx step surface, an axe-shaped step surface and a cylindrical surface; the middle part of the ring gauge is a conical hole, three quincunx step surfaces are uniformly distributed on the end surface of a small hole of the conical hole, three axe-shaped step surfaces are formed between adjacent quincunx step surfaces, and the heights of the three quincunx step surfaces and the three axe-shaped step surfaces from six step surfaces to the bottom surface are different.
The taper of the conical hole is the same as the taper of the measured NPT pipe thread, and is 1: 16.
the diameter of the large hole end of the conical hole is a standard size for calculating and determining the distance from the three quincunx step surfaces and the three axe-shaped step surfaces to the bottom surface.
Different letters are printed on six step surfaces of the small hole end of the ring gauge, wherein the letters are B, BT, MN, MNT, MX and MXT; wherein: b is the minimum size of the basic size section, BT is the maximum size of the basic size section, MN is the minimum size of the small size section, MNT is the maximum size of the small size section, MXT is the maximum size of the large size section, and MX is the minimum size of the large size section.
The outer surface of the ring gauge is a cylindrical surface, and knurling is processed on the cylindrical surface.
The utility model adopts the above technical scheme can reach following positive effect after: the utility model discloses simple structure, convenient to use, measurement are accurate. For detecting the major diameter and the taper of the NPT pipe thread external thread, on the basis that the pitch diameter of the NPT pipe thread external thread is qualified, the major diameter and the taper of the detected NPT pipe thread external thread can be ensured to be completely qualified, and reliable conditions are provided for solving the three-leakage faults of oil leakage, water leakage and gas leakage at the detected NPT pipe thread part.
Drawings
Fig. 1 is a schematic structural view of a NPT pipe thread external thread major diameter detection ring gauge of the present invention in a front view;
figure 2 is the utility model relates to a NPT pipe thread external screw thread major diameter detects overlooking structure schematic diagram of ring gauge.
In the figure: 1, a bottom surface, 2, a conical hole, 3, a quincuncial step surface, 4, an axe-shaped step surface and 5, a cylindrical surface.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples. As shown in fig. 1-2: the utility model provides a NPT pipe thread external screw thread major diameter detects ring gage, wholly is short cylinder, includes: the bottom surface 1, the conical hole 2, the quincunx step surface 3, the axe step surface 4 and the cylindrical surface 5; the middle part of the ring gauge is a conical hole 2, three quincunx step surfaces 3 are uniformly distributed on the end surface of a small hole of the conical hole 2, and three axe-shaped step surfaces 4 are formed between the adjacent quincunx step surfaces 3.
The six step surfaces are printed with different letters, namely B, BT, MN, MNT, MX and MXT. Showing the step surfaces corresponding to different limit sizes. The diameter of the large hole end of the conical hole 2 is a reference size and is used for calculating and determining the distances from the three quincunx step surfaces 3 and the three axe-shaped step surfaces 4 to the bottom surface 1 respectively.
The axial distances from each pair of two adjacent step surfaces B and BT, MN and MNT, MX and MXT to the bottom surface 1 are respectively the limit dimension corresponding to 1/3 of the reference distance tolerance dimension of the NPT pipe thread; in order to measure accurately, the reference distance of the NPT pipe thread external thread is divided into three equal sections according to tolerance, namely a large-size section, a basic-size section and a small-size section, wherein each section corresponds to two step surfaces of the ring gauge. Therefore, the small hole end of the NPT pipe thread external thread major diameter detection ring gauge has three pairs of six step surfaces for detecting whether the external thread major diameter is qualified, different letters are printed on the top of each step surface for distinguishing the limit sizes corresponding to different step surfaces, as shown in FIG. 2, MXT is the maximum size of a large-size section, MX is the minimum size of the large-size section, BT is the maximum size of a basic-size section, B is the minimum size of the basic-size section, MNT is the maximum size of a small-size section, and MN is the minimum size of the small-size section.
The heights from the six step surfaces to the bottom surface 1 are not equal, and the calculation method is as follows: after the size of the large end of the taper hole of each specification is determined, the maximum distance (MXT distance to the bottom surface 1), the middle distance and the minimum distance (MN distance to the bottom surface 1) from the small end surface of the NPT pipe thread to the bottom surface 1 are calculated according to the taper tolerance of the NPT pipe thread. And dividing the reference distance tolerance of the NPT pipe thread into three sections equally, and calculating the upper deviation and the lower deviation. The upper deviation and the lower deviation are added to each segment length, and the height difference of each pair of step surfaces is obtained. The maximum distance minus the height difference is the distance of MX from the bottom surface 1. The minimum distance (distance of MN to the bottom surface 1) plus the height difference is the distance of MNT to the bottom surface 1. The intermediate distance is added to half of the height difference, i.e., the distance from BT to the bottom surface 1, and the intermediate distance is subtracted to half of the height difference, i.e., the distance from B to the bottom surface 1.
The taper of the conical hole 2 is the same as that of the NPT pipe thread, and is 1: 16.
the outer surface of the ring gauge is a cylindrical surface 5, and knurling is processed on the cylindrical surface 5, so that detection operation is facilitated
When the major diameter of the NPT pipe thread external thread is measured, firstly, the pitch diameter of the NPT pipe thread external thread is detected by using a thread taper working ring gauge, and after the pitch diameter is qualified, the distance from the end face of the external thread to the middle value of the thread taper working ring gauge is detected by using a caliper; dividing the reference distance tolerance of the NPT pipe thread external thread into three sections equally, wherein each section is 1/3 of tolerance value; and judging the size section where the reference distance of the NPT pipe thread external thread is located according to the data detected by the calipers. And finally, sleeving the NPT pipe thread external thread large-diameter detection ring gauge with the corresponding specification on the external thread, wherein if the shaking amount is large, the taper of the external thread is unqualified, and if the NPT pipe thread external thread large-diameter detection ring gauge does not shake basically, the end face of the external thread is positioned between the corresponding pair of two size section step faces, and the large diameter of the external thread is qualified. Otherwise, the major diameter of the external thread is unqualified.
The utility model discloses whether the tapering of measurable quantity NPT pipe thread external screw thread is qualified with big footpath, carries out the quality with big footpath and closes outward the screw thread tapering, effectively avoids awl thread "three to leak" trouble, simple structure, convenient to use, measurement accuracy. In actual work, a set of ring gauges with different specifications needs to be manufactured to measure external threads with different specifications.
The present invention is not limited to the situation described in the present example in practical application, and all the technical solutions and improvements that do not depart from the substance of the present invention should fall within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a NPT pipe thread external screw thread major diameter detects ring gage, wholly is short cylinder, includes: the bottom surface (1), the conical hole (2), the quincunx step surface (3), the axe step surface (4) and the cylindrical surface (5); the method is characterized in that: the middle part of the ring gauge is a conical hole (2), three quincunx step surfaces (3) are uniformly distributed on the end face of a small hole of the conical hole (2), three axe-shaped step surfaces (4) are formed between the adjacent quincunx step surfaces (3), the outer surface of the ring gauge is a cylindrical surface (5), and knurling is processed on the cylindrical surface (5).
2. The NPT pipe thread external thread major diameter detection ring gauge of claim 1, wherein: the taper of the conical hole (2) is the same as the taper of the measured NPT pipe thread, and is 1: 16.
3. the NPT pipe thread external thread major diameter detection ring gauge of claim 1, wherein: the diameter of the large hole end of the conical hole (2) is a standard size for calculating and determining the distance from the three quincunx step surfaces (3) and the three ax step surfaces (4) to the bottom surface (1).
4. The NPT pipe thread external thread major diameter detection ring gauge of claim 1, wherein: the heights of the three quincunx step surfaces (3) and the three axe-shaped step surfaces (4) from six step surfaces to the bottom surface (1) are different.
5. The NPT pipe thread external thread major diameter detection ring gauge of claim 1, which is characterized in that: different letters are printed on six step surfaces of the small hole end of the ring gauge, wherein the letters are B, BT, MN, MNT, MX and MXT; wherein: b is the minimum size of the base size section, BT is the maximum size of the base size section, MN is the minimum size of the small size section, MNT is the maximum size of the small size section, MXT is the maximum size of the large size section, and MX is the minimum size of the large size section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123260733.3U CN216745851U (en) | 2021-12-23 | 2021-12-23 | NPT pipe thread external screw thread major diameter detects ring gage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123260733.3U CN216745851U (en) | 2021-12-23 | 2021-12-23 | NPT pipe thread external screw thread major diameter detects ring gage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216745851U true CN216745851U (en) | 2022-06-14 |
Family
ID=81937086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123260733.3U Active CN216745851U (en) | 2021-12-23 | 2021-12-23 | NPT pipe thread external screw thread major diameter detects ring gage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216745851U (en) |
-
2021
- 2021-12-23 CN CN202123260733.3U patent/CN216745851U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN216745851U (en) | NPT pipe thread external screw thread major diameter detects ring gage | |
| CN107202528A (en) | A kind of flareless pipe joint termination dimension measuring device | |
| CN202661020U (en) | Tool used for measuring depth of conical hole in deep hole | |
| CN109944281B (en) | Load box and measuring method thereof | |
| CN202255248U (en) | Embedded sleeve perpendicularity detection tool set | |
| CN216954328U (en) | NPT pipe screw thread taper hole path detects feeler gauge | |
| CN108061507B (en) | Detection tool for sealing oil port | |
| CN207035980U (en) | A kind of flareless pipe joint termination dimension measuring device | |
| CN205561738U (en) | Organism main bearing stud hole and terminal surface straightness detection device that hangs down | |
| CN217032343U (en) | Switching frock | |
| CN210147294U (en) | Pipeline groove detection sample plate | |
| CN208476108U (en) | A kind of zero clearance mechanical detection hole location device | |
| CN203203519U (en) | Oil well pipe knuckle thread length comparison template | |
| CN201803655U (en) | Incomplete thread plug gauge of petroleum pipe coupling | |
| CN218296947U (en) | Conical thread gauge | |
| CN117346618A (en) | Combined plug gauge for measuring 60-degree taper pipe internal threads and measuring method | |
| CN207600431U (en) | A kind of workpiece endoporus unicom situation pneumatic detection device | |
| CN219757166U (en) | Geothermal well casing high-pressure fluid seal thread pitch diameter detection proof mass block | |
| CN215262364U (en) | Device for detecting performance in working cylinder after spinning and sealing of shock absorber | |
| CN220039342U (en) | NPT pipe thread external screw thread cone angle detection measuring tool | |
| CN215893442U (en) | Gear ring jumping check tool | |
| CN101285672A (en) | Special threaded sleeve sealing face coning measurement method | |
| CN212109845U (en) | Oil pipe joint go-no go gauge checking fixture | |
| CN218895958U (en) | Device for testing torque performance of impact pneumatic trigger | |
| CN216815301U (en) | Sphere roundness detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |