Pneumatic down-the-hole hammer drill bit with strong cold side teeth for dry-hot rock
A technology of dry hot rock and down-the-hole hammer, which is applied in construction and other fields, can solve the problems of low efficiency of dry hot rock crushing and shortened drill bit life, and achieve the effect of reducing rock mass strength, reducing quantity, and ensuring cooling effect
Pending Publication Date: 2018-10-09
JILIN UNIV
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Problems solved by technology
[0005] The purpose of the present invention is to provide a new type of reliable drilling speed for the existing hot dry rock drilling in order to provide a new type of reliable drilling speed for the existing DTH hammer drill bit edge tooth wear seriously lead to the shortage of drill bit life shortening and dry hot rock rock breaking efficiency is low. The side tooth strong cold type hot dry rock pneumatic down-the-hole hammer bit
Method used
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Embodiment 1
[0027] This example provides a side-teeth strong-cooling dry-hot-rock pneumatic down-the-hole hammer drill bit, the ratio of the diameter of the central air channel 2 located in the middle of the drill bit body 1 to the maximum radial diameter of the drill bit body 1 is 23% to 45% , not only to ensure the strength and rigidity of the drill body 1, but also to ensure that the air flows smoothly to the Laval nozzle 6, the gas in the central air channel 2 passes through the Laval nozzle 6, the speed increases, and the temperature decreases by 40°C to 70°C to become The supersonic low-temperature gas is injected from the injection hole 5 at a certain angle through the Laval nozzle 6 to the direction of motion of the drill body 1, and a local low-temperature air curtain can be formed around the tooth 4 during the drilling process to continuously cool the tooth 4. At the same time, the low-temperature gas can also perform cold cracking on the hot and dry rock mass around the tooth 4,...
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The invention provides a pneumatic down-the-hole hammer drill bit with strong cold side teeth for dry-hot rock, and relates to the technical field of dry-hot rock drilling tools. The pneumatic down-the-hole hammer drill bit comprises a drill bit body, a central air flow channel, an air flow channel for cleaning debris at the bottom of a hole, spherical teeth, the side teeth and laval nozzles, wherein the number of the laval nozzles is the same as the number of the side teeth and the laval nozzles correspond to the side teeth one by one; and the air inlet ends of the laval nozzles communicate with the central air flow channel, injection holes located at the end portions of the laval nozzles are formed near the side teeth, and the outlets flow lines of the laval nozzles have included angleswith the straight line on which the movement direction of the drill bit body is located during operation. In a process of drilling the dry-hot rock with a pneumatic down-hole hammer, part of the high-temperature airflow in the central air flow channel passes through the laval nozzles, the speed is increased, the temperature is reduced by 40 DEG C to 70 DEG C, supersonic low-temperature gas is sprayed by the laval nozzles to forcibly cool the side teeth, and meanwhile, the dry-hot rock around the side teeth can be rapidly cooled to reduce the damage strength of the dry-hot rock and generate cracks, and thus the drilling efficiency of the dry-hot rock is improved.
Description
technical field [0001] The invention relates to the technical field of hot dry rock drilling tools, in particular to a hot dry rock pneumatic down-the-hole hammer drill bit with side teeth and strong cooling for increasing the drilling speed of the hot dry rock and prolonging the life of the drill bit. Background technique [0002] Geothermal energy is a green, low-carbon, recyclable and renewable energy. It has the characteristics of large reserves, wide distribution, cleanness, environmental protection, stability and reliability. It is a feasible and competitive clean energy. Compared with hydrothermal geothermal resources, more geothermal energy is stored in underground high-temperature rock masses with no or little water to form hot dry rock geothermal resources. [0003] Drilling is a key link in the development of hot dry rock. At present, during the development of hot dry rock, drilling costs account for about 70% of the total cost. Excessive drilling costs and long...
Claims
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Login to View More IPC IPC(8): E21B10/61
CPCE21B10/61
Inventor 彭枧明李彦良程靖清葛东许天福王茂森张延军博坤黄朝阳廉墨客
Owner JILIN UNIV