CN203655346U - Cavitation jet slotting pressure relief device - Google Patents
Cavitation jet slotting pressure relief device Download PDFInfo
- Publication number
- CN203655346U CN203655346U CN201420021732.4U CN201420021732U CN203655346U CN 203655346 U CN203655346 U CN 203655346U CN 201420021732 U CN201420021732 U CN 201420021732U CN 203655346 U CN203655346 U CN 203655346U
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- China
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- pressure relief
- relief device
- cavitation jet
- drill bit
- cavitation
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Abstract
The utility model provides a cavitation jet slotting pressure relief device. The cavitation jet slotting pressure relief device comprises a drill rod and a slotting drill bit with a plurality of cavitation nozzles, wherein the drill rod is formed by sleeving a thick steel pipe and a thin steel pipe by virtue of a porous annular disc and in threaded connection with the slotting drill bit; high-pressure water is injected into the drill rod by virtue of a high-pressure pump station, and the high-pressure water can be formed into double beams of multi-angle cavitation jet flows with strong erosion attack ability after being jetted out by virtue of the cavitation nozzles. The double beams of multi-angle cavitation jet flows formed by the cavitation jet slotting pressure relief device are used for slotting in a bore, so that the depth and the width of a slot cut by the jet flows can be effectively increased, and therefore, the slotting rate is increased and the operation time is saved, and moreover, the operation pressure of the system can be effectively reduced and the safe reliability of the device can be improved so that the improvement of the extraction efficiency of coal gas and the elimination of the outburst danger of coal and gas can be achieved remarkably. The device is simple in structure, convenient to operate, and has the characteristics of safety, water saving, high working efficiency and the like, and further has wide application value in the fields of coal seam gas extraction and coal-gas outburst elimination.
Description
Technical field
The utility model relates to a kind of cavitation jet slot pressure relief device, is particularly useful for the soft complicated seam release of high gas anti-reflection and eliminate coal seam coal and gas outburst risk.
Background technology
The major measure that China administers mine gas is take drilling gas extraction way as main gas pumping measure.A large amount of experimental studies and scene are applied and are shown, hydraulic slotted liner technique strengthening gas pumping method can draw out methane effectively, reaches the object of eliminating coal and Gas Outburst.Early stage high-pressure water jet slot technology in the application in colliery mainly take abradant jet as working media, but because abrasive material easily causes spray nozzle clogging and comparatively serious to the loss of equipment, the main working media of high-pressure water jet slot technology of application is pure water jets or pulse water jet at present.This technology exists in operation process that system pressure is higher, backwater returns the problems such as ickings process is not smooth, has directly affected safety in operation process and to the anti-reflection effect of coal body.CN103075180A disclosed " a kind of bubble-liquid two-phase jet slotting system and method ", although can improve jet cutting power, reduce operation water supply volume, reduce and suppress hole and spray orifice phenomenon, but in the time carrying out slot operation, need to use injector and connect high-pressure air source, having increased complexity and the danger of system.In order effectively to address the above problem, simultaneously in order to improve the application of the anti-reflection technology of hydraulic slotted liner technique release in high gas weak seam gas pumping, research and improve the water jet structure in water conservancy slot process, and the jet slot pressure relief device of development of new is very necessary, this is significant to improving mine gas extraction efficiency and strengthening security reliability of hydraulic slotted liner technique technology.
Utility model content
Technical problem: the purpose of this utility model is to overcome defect of the prior art, provides a kind of easy and simple to handle, and security reliability is strong, cavitation jet slot pressure relief device and method that slot efficiency is high.
Technical scheme:
A kind of cavitation jet slot of the utility model pressure relief device, comprises drilling rod and the seam cutting drill bit that is provided with multiple cavitating nozzles, and drilling rod and seam cutting drill bit are threaded connection.
Described drilling rod is that a thick steel pipe and a fine steel tube are socketed to form by two circular disks, between thick steel pipe and fine steel tube, forms annular space; Described circular disk is provided with eight symmetrical air vents; There are respectively male thread joint and box thread joint in described fine steel tube rear and front end, and male thread joint and box thread joint have the male and female screw thread of mutual coupling; Described seam cutting drill bit is provided with the annular space matching with drilling rod; Described cavitating nozzle is merged and is formed by two conic nozzles, wherein, near the jet expansion cylindrical section of drilling rod one side, is 15 degree angles, and two jet expansion cylindrical section both sides, is respectively equipped with two air inlet ports that are communicated with annular space with vertical seam cutting drill bit direction; Described cavitating nozzle is three, and to be 120 degree angles arranged evenly, and be threaded with described seam cutting drill bit.
Beneficial effect: the two-beam multi-angle cavitation jet that the utility model forms is compared with pure water jets, there is very strong erosion attack ability, the slot degree of depth and the width of jet are greatly improved, effectively improve slot speed, save the activity duration, there is significant effect to improving coal gas extraction efficiency and elimination coal and gas outburst risk; And, completing under identical slot effect prerequisite, can effectively reduce system job pressure, improve the security reliability of equipment.Apparatus of the present invention are simple in structure, easy to operate, have water saving, the feature such as practical, are with a wide range of applications at coal bed gas extraction and coal and gas extinction field.
Accompanying drawing explanation
Fig. 1 is the structure sectional view of cavitation jet slot pressure relief device of the present utility model.
Fig. 2 is the structure sectional view of cavitating nozzle of the present utility model.
Fig. 3 be in the utility model drilling rod in the cross-sectional view at the section 1-1 place of cavitation jet slot pressure relief device.
Fig. 4 be in the utility model seam cutting drill bit in the cross-sectional view at the section 2-2 place of cavitation jet slot pressure relief device.
In figure: 1-drilling rod, 2-seam cutting drill bit, 3-cavitating nozzle, 4-thick steel pipe, 5-fine steel tube, 6-circular disk, 7-air vent, 8-male thread joint, 9-box thread joint, 10-annular space, 11-air inlet port, 12-jet expansion cylindrical section.
The specific embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further described:
A kind of cavitation jet slot of the utility model pressure relief device, is mainly made up of drilling rod 1 and seam cutting drill bit 2, and drilling rod 1 is threaded connection with seam cutting drill bit 2, and seam cutting drill bit 2 is provided with three and is 120 degree angles cavitating nozzle 3 arranged evenly.Described drilling rod 1 is that a thick steel pipe 4 and a fine steel tube 5 are socketed to form by two circular disks 6, between thick steel pipe 4 and fine steel tube 5, forms annular space 10, is provided with eight symmetrical air vents 7 on circular disk 6; There are respectively male thread joint 8 and box thread joint 9 in described fine steel tube 4 rear and front ends, and male thread joint 8 and box thread joint 9 have the male and female screw thread of mutual coupling; Described seam cutting drill bit 2 is provided with the annular space 10 matching with drilling rod 1; Described cavitating nozzle 3 is merged and is formed by two conic nozzles, the wherein jet expansion cylindrical section 12 of close drilling rod 1 one sides, be 15 degree angles with the direction vertical with seam cutting drill bit 2, and two jet expansion cylindrical section 12 both sides, be respectively equipped with two air inlet ports 11 that are communicated with annular space 10;
Case study on implementation:
A kind of cavitation jet slot pressure relief device of the utility model and rig, high pressure pumping station system cooperating, in the time carrying out slot operation, first according to design scheme, layer mash gas pumping drilling of wearing of the routine of constructing to coal seam in the base plate extraction tunnel in coal seam, then cavitation jet slot pressure relief device of the present invention is connected with rig, utilize rig that seam cutting drill bit 2 is delivered to after the interior projected depth of boring, start pumping station system, to the interior injection water under high pressure of drilling rod 1, the pressure limit of water under high pressure is conventionally at 5MPa～15Mpa, water under high pressure is in the time that cavitating nozzle 3 sprays, produce negative pressure at jet expansion cylindrical section, make air inlet port 11 air amounts of water under high pressure through cavitating nozzle 3, the introducing of appropriate air increases the quantity of microbubble in jet, impel water jet to produce cavitation, thereby form the very capable cavitation jet of slot, in addition, because cavitating nozzle 3 has two jet expansion cylindrical sections 12 that are mutually 15 degree angles, therefore can form the cavitation jet of two-beam multi-angle, can effectively expand slot width, drive drilling rod 1 to be rotated cutting damage coal body by rig, in boring, front and back move back and forth drilling rod 1 simultaneously, when the cinder amount of discharging boring reaches 2t～4t, or every meter of drilling depth slot time is while reaching 10min～20min, close pumping station system, and exit drilling rod 1, complete slot operation.
Claims (6)
1. a cavitation jet slot pressure relief device, it is characterized in that: it is made up of drilling rod (1) and seam cutting drill bit (2), drilling rod (1) is socketed to form by two circular disks (6) by thick steel pipe (4) and fine steel tube (5), between thick steel pipe (4) and fine steel tube (5), form annular space (10), drilling rod (1) is threaded connection with seam cutting drill bit (2), and seam cutting drill bit (2) is provided with the cavitating nozzle (3) of multiple inlets (11).
2. a kind of cavitation jet slot pressure relief device according to claim 1, it is characterized in that: described fine steel tube (4) rear and front end is respectively equipped with male thread joint (8) and box thread joint (9), and male thread joint (8) and box thread joint (9) have the male and female screw thread of mutual coupling.
3. a kind of cavitation jet slot pressure relief device according to claim 1, is characterized in that: described circular disk (6) is provided with eight symmetrical air vents (7).
4. a kind of cavitation jet slot pressure relief device according to claim 1, is characterized in that: one end that described seam cutting drill bit (2) is connected with drilling rod (1) is provided with the annular space (10) matching with drilling rod (1).
5. a kind of cavitation jet slot pressure relief device according to claim 1, it is characterized in that: described cavitating nozzle (3) is merged and formed by two conic nozzles, the wherein jet expansion cylindrical section (12) of close drilling rod (1) one side, be 15 degree angles with the direction vertical with seam cutting drill bit (2), and in two jet expansion cylindrical sections (12) both sides, be respectively equipped with two air inlet ports (11) that are communicated with annular space (10).
6. a kind of cavitation jet slot pressure relief device according to claim 1, it is characterized in that: described cavitating nozzle (3) has three, and it is arranged evenly on seam cutting drill bit (2) to be 120 degree angles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420021732.4U CN203655346U (en) | 2014-01-09 | 2014-01-09 | Cavitation jet slotting pressure relief device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420021732.4U CN203655346U (en) | 2014-01-09 | 2014-01-09 | Cavitation jet slotting pressure relief device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203655346U true CN203655346U (en) | 2014-06-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420021732.4U Expired - Fee Related CN203655346U (en) | 2014-01-09 | 2014-01-09 | Cavitation jet slotting pressure relief device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203655346U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653722A (en) * | 2019-01-21 | 2019-04-19 | 中煤科工集团重庆研究院有限公司 | A kind of mash gas extraction device and method of coal seam hydraulic slotted liner technique and the linkage of lower screen casing |
| CN113931608A (en) * | 2021-10-13 | 2022-01-14 | 中煤科工集团重庆研究院有限公司 | Rear-mounted binary channels abrasive material efflux slotting device |
-
2014
- 2014-01-09 CN CN201420021732.4U patent/CN203655346U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109653722A (en) * | 2019-01-21 | 2019-04-19 | 中煤科工集团重庆研究院有限公司 | A kind of mash gas extraction device and method of coal seam hydraulic slotted liner technique and the linkage of lower screen casing |
| CN113931608A (en) * | 2021-10-13 | 2022-01-14 | 中煤科工集团重庆研究院有限公司 | Rear-mounted binary channels abrasive material efflux slotting device |
| WO2023060668A1 (en) * | 2021-10-13 | 2023-04-20 | 中煤科工集团重庆研究院有限公司 | Rear-mounted dual-channel abrasive jet slotting device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140618 Termination date: 20150109 |
|
| EXPY | Termination of patent right or utility model |