CN213419056U - One-way valve for double-wall drilling tool - Google Patents
One-way valve for double-wall drilling tool Download PDFInfo
- Publication number
- CN213419056U CN213419056U CN202021186698.8U CN202021186698U CN213419056U CN 213419056 U CN213419056 U CN 213419056U CN 202021186698 U CN202021186698 U CN 202021186698U CN 213419056 U CN213419056 U CN 213419056U
- Authority
- CN
- China
- Prior art keywords
- valve body
- inner tube
- valve
- drilling tool
- spring
- 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.)
- Expired - Fee Related
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 36
- 239000011324 bead Substances 0.000 claims abstract description 6
- 238000012856 packing Methods 0.000 claims abstract description 6
- 125000006850 spacer group Chemical group 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 13
- 230000001174 ascending effect Effects 0.000 claims description 2
- 239000007788 liquid Substances 0.000 abstract description 7
- 239000011435 rock Substances 0.000 abstract description 3
- 239000002893 slag Substances 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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- Earth Drilling (AREA)
Abstract
The utility model provides a double-walled check valve for drilling tool, installs between interconnect's upper and lower connector and inner tube, the check valve includes valve body, combination seal, spring, packing ring, the circular bead in being equipped with in the lower connector, equipartition inner tube lug on the inner tube outer wall, inner tube lug are located the circular bead, and the packing ring is located the inner tube lug, the spring is located between lower connector and the inner tube, and the spring upper end touches and connects the valve body, and the spring lower extreme touches and presses the retaining ring, is equipped with the annular valve pocket of interval change between upper connector and the inner tube, and the valve body is located annular valve pocket department. The one-way valve of the utility model can ensure the smooth flow of high-pressure air when the drilling machine works normally; when the drilling is stopped, external circulating liquid and rock slag can be effectively prevented from flowing back to annular gaps of the inner pipe and the outer pipe of the double-wall drilling tool, and the blockage and the damage of a high-pressure air channel are avoided. The utility model discloses simple structure, the equipment is swift convenient, and can require to change different springs according to the gas pressure of difference.
Description
Technical Field
The utility model relates to a drilling tool, especially a check valve for double-walled drilling tool.
Background
The down-the-hole hammer reverse circulation drilling efficiency is high, the well forming period is short, and the cost is low, so that the down-the-hole hammer reverse circulation drilling method is widely applied to the drilling of hydrological wells, the construction of mine ventilation holes and rescue holes. The double-wall drilling tool is a drilling tool necessary for drilling construction, high-pressure air is a power source, the high-pressure air moves downwards through an annular gap between an inner pipe and an outer pipe in the double-wall drilling tool to drive the down-the-hole hammer to work, and a drill bit of the down-the-hole hammer breaks rocks under the action of rotation and impact. The waste gas reaches the bottom of the hole through the down-the-hole hammer drill bit and then is acted with the circulating liquid together to return the drill cuttings to the ground through the central channel of the inner pipe. During the drill stopping period of the drilling machine, circulating liquid and drill cuttings between the drill rod and the annular gap of the hole wall often flow back to the annular gap between the inner pipe and the outer pipe of the double-wall drilling tool under the action of pressure difference, so that the normal use of the drilling tool and the down-the-hole hammer is influenced, the blockage can be caused in serious conditions, the construction efficiency is reduced, and the construction period is delayed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the drawback of prior art, provide one kind and can guarantee to prevent to circulate liquid and drill chip to flow back to the check valve for double-walled drilling tool of double-walled drilling tool inner tube and outer tube annular gap during the drill stopping period.
The problem of the utility model is solved by the following technical scheme:
the utility model provides a double-walled check valve for drilling tool, installs between interconnect's upper and lower connector and inner tube, the check valve includes valve body, combination seal, spring, packing ring, the circular bead in being equipped with in the lower connector, equipartition inner tube lug on the inner tube outer wall, inner tube lug are located the circular bead, and the packing ring is located the inner tube lug, the spring is located between upper and lower connector and the inner tube, and the spring upper end touches and connects the valve body, and the spring lower extreme touches and presses the retaining ring, is equipped with the annular valve pocket of interval change between upper connector and the inner tube, and the valve body is located annular valve pocket department.
The upper joint of the one-way valve for the double-wall drilling tool is provided with an upper limiting platform for limiting the ascending of the valve body, and the inner pipe is provided with a lower limiting platform for limiting the descending of the valve body.
According to the one-way valve for the double-wall drilling tool, the inner diameter of the valve body is in clearance fit with the inner pipe, the outer diameter of the valve body is matched with the upper joint sealing section, three combined seals are arranged on the inner wall of the valve body, two combined seals are arranged on the inner wall of the valve body, and one combined seal is arranged on the outer wall of the valve body.
The lower part of the valve body of the one-way valve for the double-wall drilling tool is provided with the guide section, and the guide section is inserted into the inner hole of the spring.
The check valve for the double-wall drilling tool further comprises a spacer bush and an elastic check ring, wherein the spacer bush is a thin-wall bush, the spacer bush is sleeved on the inner side of the lower connector, the lower end of the spacer bush is in contact with the inner pipe bump, and the elastic check ring is positioned on the upper portion of the spacer bush and embedded on the inner wall of the lower connector.
The above-mentioned double-walled check valve for drilling tool, inner tube lug set up four.
The utility model is designed for solving the problem of backflow of circulating liquid and drilling cuttings, and the one-way valve can ensure smooth flow of high-pressure air when the drilling machine works normally; when the drilling is stopped, external circulating liquid and rock slag can be effectively prevented from flowing back to annular gaps of the inner pipe and the outer pipe of the double-wall drilling tool, and the blockage and the damage of a high-pressure air channel are avoided. The utility model discloses simple structure, the equipment is swift convenient, and can require to change different springs according to the gas pressure of difference.
Drawings
The present invention will be further explained with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
fig. 3 is a sectional view B-B of fig. 1.
The reference numbers in the figures are: 1. the sealing device comprises an upper joint 1-1, an upper limiting table 2, an inner pipe 2-1, an inner pipe convex block 2-2, a lower limiting table 3, a valve body 3-1, a guide section 4, a spring 5, an annular valve cavity 6, an elastic retainer ring 7, a spacer bush 8, a gasket 9, a lower joint 9-1, an inner shoulder 10 and a sealing ring.
Detailed Description
Referring to fig. 1-3, the present invention is installed between the upper and lower joints of the screw connection and the inner pipe, and a ventilation annular channel is arranged between the inner hole of the upper and lower joints and the outer wall of the inner pipe. The check valve comprises a valve body 3, a combined seal 10, a spring 4, a gasket 8, a spacer 7 and an elastic retainer ring 6. An inner shoulder 9-1 is arranged in the lower joint 9, a plurality of inner pipe lugs 2-1 are uniformly distributed on the outer wall of the middle part of the inner pipe 2, four inner pipe lugs are arranged in the embodiment shown in the figure, the inner pipe lugs are supported by the inner shoulder, and a gasket 8 is positioned on the inner pipe lugs. The spring is arranged between the connecting section of the upper joint and the lower joint and the inner pipe 2, the upper end of the spring is in contact with the valve body, and the lower end of the spring is in contact with the check ring. A transverse valve cavity 5 with a distance decreasing from bottom to top is arranged between the upper joint and the inner pipe, and the valve body is positioned at the annular valve cavity 5. The upper and lower strokes of the valve body are respectively limited by an upper limit platform 1-1 arranged on the upper joint and a lower limit platform 2-2 arranged on the inner pipe. The inner diameter of the valve body is in clearance fit with the inner pipe, the outer diameter of the valve body is matched with the upper joint sealing section, three combined seals 10 are arranged on the valve body, and two combined seals are arranged on the inner wall of the valve body and used for sealing between the valve body and the inner pipe; and the outer wall of the valve body is provided with a combined seal for sealing between the valve body and the upper joint sealing section. The lower part of the valve body is provided with a guide section 3-1 which is inserted into an inner hole of the spring. The check valve further comprises a spacer 7 and an elastic check ring 6, the spacer is a thin-wall sleeve, the spacer is sleeved on the inner side of the lower connector, the lower end of the spacer is in contact with the inner pipe bump, and the elastic check ring is positioned on the upper portion of the spacer and is embedded on the inner wall of the lower connector. The function of the spacer and the circlip is to axially fix the inner tube against axial movement.
Referring to fig. 1, the working process of the present invention is as follows: after high-pressure air enters from the annular channel between the upper connector and the inner pipe, the valve body moves downwards under the action of pressure to compress the spring, the valve body enters a larger cavity of the annular valve cavity, the one-way valve is opened, the lower limiting table of the inner pipe limits the valve body to continue moving downwards, and the spring is protected from being compressed excessively; the high-pressure air continues to move downwards through the annular gap between the check ring, the spacer bush and the inner pipe, and the high-pressure air can continue to move downwards through the gap beside the inner pipe convex block due to the design of 4 inner pipe convex blocks outside the inner pipe. When the air compressor stops working, the valve body rapidly moves upwards under the action of the spring force and is contacted with the upper limiting table of the upper connector, the valve body enters the position of the smaller cavity of the valve cavity, the one-way valve is closed, the combined seal plays a role in sealing, circulating liquid is prevented from flowing back, and the blockage and the damage of a high-pressure air channel are avoided. The spring has the replaceability, and different springs can be used to different pressures to guarantee the passing of large-traffic high-pressure air during operation, and the leakproofness is good when closing.
Claims (6)
1. A check valve for a double-wall drilling tool, characterized in that: including interconnect's upper and lower connector, the inner tube is located upper and lower connector, the check valve is located between lower connector and the inner tube, the check valve includes valve body (3), sealing washer (10), spring (4), packing ring (8), circular bead (9-1) in being equipped with in lower connector (9), equipartition inner tube lug (2-1) on inner tube (2) outer wall, inner tube lug are located on the circular bead, and the packing ring is located the inner tube lug, the spring is located between the linkage segment of upper and lower connector and the inner tube, and the contact connects the valve body on the spring, and the spring lower extreme touches presses the retaining ring, is equipped with annular valve chamber (5) that the interval changes between upper connector and the inner tube, and the valve body is located annular valve chamber (5) department.
2. The check valve for a double wall drilling tool as recited in claim 1, wherein: the upper joint is provided with an upper limiting platform (1-1) for limiting the ascending of the valve body, and the inner pipe is provided with a lower limiting platform (2-2) for limiting the descending of the valve body.
3. The check valve for a double wall drilling tool as recited in claim 2, wherein: the inner diameter of the valve body is in clearance fit with the inner pipe, the outer diameter of the valve body is matched with the upper joint sealing section, three sealing rings (10) are arranged on the inner wall of the valve body, two sealing rings are arranged on the inner wall of the valve body, and one sealing ring is arranged on the outer wall of the valve body.
4. A one-way valve for a double wall drilling tool according to claim 3, wherein: the lower part of the valve body is provided with a guide section (3-1) which is inserted into an inner hole of the spring.
5. The check valve for a double wall drilling tool as recited in claim 4, wherein: the inner pipe connector further comprises a spacer bush (7) and an elastic check ring (6), the spacer bush is sleeved on the inner side of the lower connector, the lower end of the spacer bush is in contact with the inner pipe bump, and the elastic check ring is positioned on the upper portion of the spacer bush and is embedded on the inner wall of the lower connector.
6. The check valve for a double wall drilling tool as recited in claim 5, wherein: the inner tube protruding blocks are provided with four blocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021186698.8U CN213419056U (en) | 2020-06-24 | 2020-06-24 | One-way valve for double-wall drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021186698.8U CN213419056U (en) | 2020-06-24 | 2020-06-24 | One-way valve for double-wall drilling tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213419056U true CN213419056U (en) | 2021-06-11 |
Family
ID=76224450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021186698.8U Expired - Fee Related CN213419056U (en) | 2020-06-24 | 2020-06-24 | One-way valve for double-wall drilling tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213419056U (en) |
-
2020
- 2020-06-24 CN CN202021186698.8U patent/CN213419056U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210611 |