CN216759513U - Sand blasting gun - Google Patents

Abstract

The application discloses a sand blasting gun, which comprises a sand inlet pipe, a sand outlet pipe, a gun barrel and an inner lining pipe, wherein a sand inlet channel is arranged in the sand inlet pipe, a sand outlet channel is arranged in the sand outlet pipe, an air inlet channel and an exhaust channel are arranged in the gun barrel, at least part of the inner lining pipe and at least part of the sand inlet pipe are arranged in the exhaust channel, and the outlet end of the sand inlet pipe is arranged in a confluence channel; the sand inlet pipe is provided with a flow equalizing part, the flow equalizing part is positioned between the air inlet channel and the sand outlet pipe, and the flow equalizing part is provided with a flow guide hole; the inlet end of the confluence passage is communicated with the flow guide holes, and the outlet end of the confluence passage is communicated with the sand outlet passage; compressed air receives the restriction of the portion of flow equalizing after via inlet channel, entering exhaust passage, can carry out flow distribution through the water conservancy diversion hole to gas gets into the passageway that converges uniformly, when the compressed air in the passageway that converges flows into sand pipe, can form the negative pressure before the exit end of advancing sand pipe, so that attract the sand material in advancing sand pipe, make sand material spout from sand outlet channel along with compressed air.

Description

Sand blasting gun

Technical Field

The application relates to the technical field of sand blasting equipment, in particular to a sand blasting gun.

Background

The sand blasting guns on the market at present have the defects of low shooting speed and small flow.

First, conventional negative pressure sand blasting gun adopts the structure of middle air admission, has restricted the bore of nozzle, has further restricted the maximum sand discharge of sand blasting gun. Secondly, the flow pipeline of the compressed air is a straight-through pipe core, so that the flow speed of the compressed air is completely controlled by an external air compressor, and the sand blasting gun does not have the function of accelerating the compressed air. Third, conventional negative pressure sand blasting gun adopts the side to advance the structure of sand for the sand way is more tortuous, causes the pipeline to block up easily, still wears to go out the part near sand mouth easily.

Disclosure of Invention

The utility model aims at providing a sand blasting gun forms the negative pressure zone before advancing the export of sand passageway, attracts the sand material directly to get into out the sand passageway to overcome the not enough that exists among the prior art.

In order to realize the above technical objective, the present application provides a sand blasting gun, including: the sand inlet pipe is internally provided with a sand inlet channel; the sand outlet pipe is internally provided with a sand outlet channel which is communicated with the sand inlet channel; the gun barrel is internally provided with an air inlet channel and an air exhaust channel, and the air inlet channel is communicated with the air exhaust channel; the inner lining pipe is internally provided with a confluence channel, and the outlet end of the sand inlet pipe is arranged in the confluence channel; at least part of the sand inlet pipe is arranged in the exhaust channel, the sand inlet pipe is provided with a flow equalizing part, the flow equalizing part is positioned between the air inlet channel and the sand outlet pipe, and the flow equalizing part is provided with a flow guide hole; at least part of the lining pipes are arranged in the exhaust channel, the inlet end of the confluence channel is communicated with the flow guide holes, and the outlet end of the confluence channel is communicated with the sand outlet channel; compressed air enters the exhaust channel through the air inlet channel and flows towards the sand outlet pipe, is limited by the flow equalizing part, passes through the flow guide holes and enters the confluence channel, and forms negative pressure in front of the outlet end of the sand inlet channel after passing through the confluence channel; the sand material in the sand inlet channel is sucked by negative pressure and can be flushed out of the sand outlet channel along with the compressed air.

Further, the sand channel includes: the inlet area is communicated with the sand inlet channel and the confluence channel; an outlet zone communicating with the inlet zone; from the sand inlet channel to the outlet area, the caliber of the inlet area is gradually reduced, and negative pressure is formed in the inlet area.

Further, the confluence passage includes: the overflow area is communicated with the diversion holes; the jet flow area is communicated with the overflow area and the sand outlet channel; the caliber of the overflow area is gradually reduced from the diversion hole to the jet flow area.

Furthermore, the portion of flow equalizing is the rectangle ring, has seted up a plurality of water conservancy diversion holes in the portion of flow equalizing, and a plurality of water conservancy diversion holes set up along the circumferencial direction interval, and the centre of a circle of circumference is in on advancing sand channel's the axle center.

Furthermore, one side of the flow equalizing part close to the lining pipe is provided with a limiting wall which surrounds the flow guide hole; one side of the lining pipe close to the flow equalizing part is provided with a limiting groove, and the limiting wall can extend into the limiting groove.

Further, the outer wall of the lining pipe is provided with a sealing groove for installing the first sealing ring, so that compressed air in the exhaust channel is prevented from overflowing through a gap between the lining pipe and the exhaust channel.

Furthermore, an installation channel is also arranged in the lining pipe and is communicated with the outlet end of the confluence channel; at least part of the sand outlet pipe is arranged in the installation channel.

Furthermore, the sand blasting gun also comprises a pressing sleeve for fastening the sand outlet pipe and the lining pipe.

Furthermore, a flow choking part is also arranged on the sand inlet pipe, and the air inlet channel is positioned between the flow choking part and the flow equalizing part; and an exhaust passage between the flow resisting part and the flow equalizing part forms a gas collecting area.

Furthermore, the sand blasting gun also comprises a second sealing ring which is arranged between the flow choking part and the exhaust channel and used for preventing the compressed air in the exhaust channel from overflowing through a gap between the flow choking part and the exhaust channel.

The application provides a sand blasting gun, which comprises a sand inlet pipe, a sand outlet pipe, a gun barrel and an inner lining pipe, wherein a sand inlet channel is arranged in the sand inlet pipe, a sand outlet channel is arranged in the sand outlet pipe, an air inlet channel and an air exhaust channel are arranged in the gun barrel, at least part of the inner lining pipe and at least part of the sand inlet pipe are arranged in the air exhaust channel, and the outlet end of the sand inlet pipe is arranged in a confluence channel; the sand inlet pipe is provided with a flow equalizing part, the flow equalizing part is positioned between the air inlet channel and the sand outlet pipe, and the flow equalizing part is provided with a flow guide hole; the inlet end of the confluence passage is communicated with the flow guide holes, and the outlet end of the confluence passage is communicated with the sand outlet passage; compressed air receives the restriction of the portion of flow equalizing after via inlet channel, entering exhaust passage, can carry out flow distribution through the water conservancy diversion hole to gas gets into the passageway that converges uniformly, when the compressed air in the passageway that converges flows into sand pipe, can form the negative pressure before the exit end of advancing sand pipe, so that adsorb the sand material in advancing sand pipe, make sand material spout from sand outlet channel along with compressed air.

Drawings

FIG. 1 is a cross-sectional view of a sand blast gun according to the present disclosure;

FIG. 2 is an enlarged view of the inner structure of FIG. 1;

FIG. 3 is a schematic structural view of the sand inlet pipe in FIG. 1;

FIG. 4 is a structural sectional view in the direction A-A of the sand inlet pipe in FIG. 3;

FIG. 5 is a schematic view of the liner tube of FIG. 1.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may mean that the first feature is directly above or obliquely above the second feature, or that only the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The application provides a sand blasting gun, include: a sand inlet pipe 10, wherein a sand inlet channel 11 is arranged in the sand inlet pipe 10; the sand outlet pipe 20 is provided with a sand outlet channel 21, and the sand outlet channel 21 is communicated with the sand inlet channel 11; a barrel 30, wherein an air inlet channel 31 and an air outlet channel 32 are arranged in the barrel 30, and the air inlet channel 31 is communicated with the air outlet channel 32; and the lining pipe 40 is provided with a confluence channel 41, and the outlet end of the sand inlet pipe 10 is arranged in the confluence channel 41.

The sand material enters the sand blasting gun through the sand inlet channel 11, and the compressed air enters the sand blasting gun through the air inlet channel 31. After entering the discharge passage 32, the compressed air can enter the confluence passage 41 along the discharge passage 32.

Because the outlet end of the sand inlet pipe 10 is located in the confluence channel 41, when the compressed gas flows through the confluence channel 41, the compressed gas can only flow along the gap between the inner wall of the confluence channel 41 and the sand inlet pipe 10; therefore, the compressed air in the confluence passage 41 is annular; especially, when the compressed air flows through the sand inlet pipe 10, due to the inertia effect, the compressed air is in a state of avoiding the sand inlet pipe 10 before the outlet end of the sand inlet pipe 10, so that no compressed air or a small amount of compressed air is provided at the position facing the outlet end of the sand inlet pipe 10, and a negative pressure is formed in front of the outlet end of the sand inlet pipe 10.

Because the outlet end of the sand inlet pipe 10 is arranged in the confluence channel 41, the volume of the pipeline through which the compressed air can pass through the confluence channel 41 is reduced, and the flow velocity of the compressed air is increased along with the reduction of the passing flow area under the condition that the flow rate of the compressed air is unchanged, thereby being beneficial to the formation effect of the front negative pressure of the outlet end of the sand inlet pipe 10. The sand in the sand inlet channel 11 is sucked by negative pressure and can be flushed out of the sand outlet channel 21 along with the compressed air.

To ensure the connection stability of the sand inlet pipe 10, the barrel 30 and the liner pipe 40, at least a portion of the liner pipe 40 is disposed in the vent passage 32, and at least a portion of the sand inlet pipe 10 is disposed in the vent passage 32. Wherein at least the portion of the lining pipe 40 connected with the sand inlet pipe 10 is located in the air discharge passage 32, so that the compressed air flows into the confluence passage 41 through the air discharge passage 32, is accelerated in the confluence passage 41, and finally forms a negative pressure in front of the outlet end of the sand inlet pipe 10.

The exhaust passage 32 is provided at both ends thereof with an inlet and an outlet, respectively. The sand inlet pipe 10 is provided in the inlet and the lining pipe 40 is provided in the outlet.

In one embodiment, the sand feed pipe 10 is disposed entirely within the exhaust passage 32.

In another embodiment, referring to fig. 1, a portion of the sand inlet pipe 10 is disposed in the exhaust passage 32, and another portion of the sand inlet pipe 10 is protruded out of the inlet of the exhaust passage 32. At this time, the inlet end of the sand inlet pipe 10 is positioned outside the exhaust passage 32 so as to communicate with the sand supply device. And the outlet end of the sand inlet pipe 10 is positioned in the exhaust passage 32, so that the sand material is driven by the compressed air.

Similarly, the liner tube 40 may be completely disposed in the exhaust channel 32, or may be partially disposed in the exhaust channel 32, and the other portion may be protruded out of the exhaust channel 32. Details are not repeated.

It is easy to think that when the compressed air enters the exhaust channel 32 through the air inlet channel 31, the gas in the exhaust channel 32 is mainly concentrated near the outlet of the air inlet channel 31, which easily causes the uneven distribution of the gas in the exhaust channel 32, and further affects the adsorption force of the negative pressure and the position where the negative pressure is formed, and finally affects the sand blasting effect.

Therefore, the sand inlet pipe 10 is provided with a flow equalizing part 12, the flow equalizing part 12 is positioned between the air inlet channel 31 and the sand outlet pipe 20, and the flow equalizing part 12 is provided with a flow guide hole 12 a; the inlet end of the confluence channel 41 is communicated with the diversion hole 12a, and the outlet end of the confluence channel 41 is communicated with the sand outlet channel 21.

Specifically, referring to fig. 1, in the illustrated embodiment, the flow equalizing portion 12 is protruded from the surface of the sand inlet pipe 10, the air inlet channel 31 is located on the right side of the flow equalizing portion 12, and the sand outlet pipe 20 is located on the left side of the flow equalizing portion 12. With combined reference to fig. 3 and 4, the flow equalizing portion 12 is disposed in a ring around the sand inlet pipe 10, and at the same time, the flow equalizing portion 12 extends from the sand inlet pipe 10 toward the inner wall of the exhaust passage 32. Thereby, the flow equalizing portion 12 can block the flow of the compressed air, and the guide holes 12a can guide the flow of the compressed air to the collecting duct 41.

As can be easily imagined, the flow rate, the flow velocity and the flow direction of the compressed air can be controlled by controlling the number, the positions and the sizes of the diversion holes 12a on the flow equalizing part 12. For example, when only one diversion hole 12a is provided on the flow equalizing part 12, the compressed air mainly flows towards the sand outlet pipe 20 through the diversion hole 12 a; at this time, since the compressed air has a small flow area and a fixed flow position, the compressed air has a strong flow velocity and can rapidly impact the duct corresponding to the flow position. For another example, when the plurality of flow guiding holes 12a are uniformly arranged on the flow equalizing portion 12, the compressed air can uniformly enter the confluence channel 41 through the plurality of flow guiding holes 12 a.

The number, position and size of the diversion holes 12a are not limited in the present application.

The flow equalizing portion 12 may be integrally formed with the sand inlet pipe 10, or may be fixedly mounted on the sand inlet pipe 10.

Specifically, the compressed air enters the exhaust channel 32 through the air inlet channel 31 and flows towards the sand outlet pipe 20, is limited by the flow equalizing part 12, passes through the diversion holes 12a and enters the confluence channel 41, and forms negative pressure in front of the outlet end of the sand inlet channel 11 after passing through the confluence channel 41; the sand in the sand inlet channel 11 is sucked by negative pressure and can be flushed out of the sand outlet channel 21 along with the compressed air.

Just to going out sand passageway 21 through making into sand inlet channel 11, during the sand blasting gun sandblast that this application provided, sand material in sand inlet channel 11 can directly get into out sand passageway 21, from this, can avoid sand material wearing and tearing part, can also avoid the pipeline that sand material direction of motion change leads to block up.

By providing the liner pipe 40 such that the outlet end of the sand inlet passage 11 is in the confluence passage 41 and the portion of the sand inlet passage 11 connected to the confluence passage 41 is in the air discharge passage 32, it is possible to increase the flow velocity of the compressed air in the confluence passage 41 by using different flow areas of the air discharge passage 32 and the confluence passage 41, thereby enhancing the adsorption effect of the negative pressure.

By providing the flow equalizing portion 12, the flow rate, flow velocity, and flow direction of the compressed air can be controlled so that the compressed air uniformly enters the confluence passage 41, thereby ensuring the formation of negative pressure and the stability of the formation position.

In addition, the position and the size of the air inlet channel 31 are not limited, so that the sand blasting gun provided by the application cannot limit the sand discharging amount. The required sand spitting amount can be realized by adjusting the air inflow of the compressed air and regulating the adsorption force of the negative pressure.

Optionally, the sand inlet channel 11 and the sand outlet channel 21 extend in the same direction.

For example, referring to fig. 1, in the illustrated embodiment, the sand inlet channel 11 and the sand outlet channel 21 are both extended in the left-right direction, and the axes of the sand inlet channel 11 and the sand outlet channel 21 are arranged in a collinear manner, so that sand in the sand inlet channel 11 can rapidly and accurately enter the sand outlet channel 21, and can flush out of the sand outlet channel 21 along with compressed air to perform sand blasting.

Alternatively, the extending direction of the intake passage 31 intersects the extending direction of the exhaust passage 32.

For example, referring to fig. 1, in the illustrated embodiment, the air intake passage 31 is provided below the air discharge passage 32 and is inclined from bottom to top toward the sand discharge pipe 20. So that the air inlet passage 31 is inclined toward the sand outlet pipe 20, facilitating the flow of the compressed air toward the sand outlet pipe 20.

Optionally, the sand channel 21 comprises: an inlet area 21a communicating the sand inlet passage 11 and the confluence passage 41; an outlet zone 21b communicating with the inlet zone 21 a; from the sand inlet channel 11 to the outlet zone 21b, the aperture of the inlet zone 21a is gradually reduced, and negative pressure is formed in the inlet zone 21 a.

Referring specifically to fig. 1 and 2, in the illustrated embodiment, the inlet area 21a is disposed on the right side of the outlet area 21b, and the inlet area 21a gradually decreases from right to left; the sand inlet channel 11 and the outlet of the confluence channel 41 are disposed at the right side of the inlet area 21a and face the inlet area 21 a. Further, the outlet end of the sand inlet pipe 10 is close to the inlet area 21a, and the opening of the inlet area 21a is slightly larger than the outlet of the confluence channel 41. When the compressed air is output from the confluence passage 41, the compressed air mainly impacts the inner wall of the inlet area 21a, and the position of the inlet area 21a facing the sand inlet pipe 10 (i.e. in front of the outlet end of the sand inlet passage 11) forms a low-pressure area because of small gas amount; because the air pressure around the inlet area 21a is high and the air pressure in the middle is low, negative pressure is formed in the low-pressure area, and then the sand material is adsorbed. After being sucked into the low pressure zone, the sand material will move along the outlet zone 21b with the compressed air under the influence of inertia and air flow.

The inlet area 21a that tapers can increase the negative pressure area, guarantee to spit the sand volume, can guide compressed air again to converge in order to drive the sand material blowout of being sucked out, can also avoid sand material to block up sand outlet channel 21.

Alternatively, the confluence passage 41 includes: the overflow area 41a is communicated with the diversion hole 12 a; the jet flow area 41b is communicated with the overflow area 41a and the sand outlet channel 21; the diameter of the overflow area 41a gradually decreases from the orifice 12a to the jet area 41 b.

Referring specifically to fig. 1, 2 and 5, in the illustrated embodiment, the overflow area 41a is disposed on the right side of the jet area 41b, and the overflow area 41a gradually decreases from right to left. It is easy to understand, behind the compressed air passed through water conservancy diversion hole 12a, get into overflow area 41a, because overflow area 41a convergent, compressed air's velocity of flow increases gradually, existing flow that is favorable to the air current, ensure that the air current can take the sand material blowout, is favorable to the formation of negative pressure again, can also strengthen the negative pressure effect, and then guarantee the injection effect of sand blasting gun.

Further, the aperture of the jet region 41b is constant, and the aperture of the jet region 41b is the minimum aperture of the overflow region 41 a. The outlet end of the sand inlet pipe 10 passes through the overflow area 41a and is located in the jet area 41 b.

It is easy to understand that, in the case where the outer diameter of the sand inlet pipe 10 is constant, since the caliber of the jet flow region 41b is minimum, the flow area between the sand inlet pipe 10 and the jet flow region 41b in the confluence passage 41 is minimum. The compressed air reaches the maximum flow rate after entering the jet zone 41 b. Because the caliber of the jet region 41b is not changed any more and the extending direction of the jet region 41b is not changed, the compressed air can form a high-speed and stable flowing state in the jet region 41b, thereby ensuring the forming effect of negative pressure.

Optionally, the flow equalizing portion 12 is a rectangular ring, a plurality of flow guiding holes 12a are formed in the flow equalizing portion 12, the flow guiding holes 12a are arranged at intervals in the circumferential direction, and the center of the circle is located on the axis of the sand inlet channel 11.

At this time, the sand inlet pipe 10 is a circular pipe (in the embodiment shown in fig. 1 and 3, the sand inlet pipe 10 is a circular pipe, but the pipe diameter of the sand inlet pipe 10 changes), the flow equalizing portion 12 surrounds the sand inlet pipe 10 for a circle, and with reference to fig. 3 and 4, the flow equalizing portion 12 is circular, and the outer diameter of the flow equalizing portion 12 does not change along the axial direction of the sand inlet pipe 10. Meanwhile, the exhaust passage 32 is a cylindrical passage. Through setting up the portion of flow equalizing 12 and being the rectangle ring, the outer peripheral face of portion of flow equalizing 12 can be everywhere pressed close to the inner wall of exhaust passage 32 to effectively restrict compressed gas's circulation direction, ensure that compressed gas mainly flows to sand outlet pipe 20 through water conservancy diversion hole 12 a.

The outer peripheral surface of the flow equalizing portion 12 can be attached to the inner wall of the exhaust passage 32, and a gap can be left between the outer peripheral surface of the flow equalizing portion and the inner wall of the exhaust passage 32.

By arranging the plurality of guide holes 12a at intervals in the circumferential direction, the compressed gas flowing out through the guide holes 12a can be uniformly distributed.

Optionally, a limiting wall 12b is disposed on one side of the flow equalizing portion 12 close to the lining pipe 40, and the limiting wall 12b surrounds the diversion hole 12 a.

Referring to fig. 1, in the illustrated embodiment, a limiting wall 12b is disposed on the left side of the flow equalizing portion 12, and the limiting wall 12b protrudes toward the lining pipe 40. Referring to fig. 3 and 4, when the flow equalizing portion 12 is a rectangular ring, the limiting wall 12b is wound by one turn along the outer circumference of the flow equalizing portion 12. On one hand, the limiting wall 12b can strengthen the structure of the flow equalizing part 12; on the other hand, the outer wall of the limiting wall 12b can match the outer peripheral surface of the flow equalizing part 12 to be close to the inner wall of the exhaust channel 32, so that the flowing direction of the compressed gas is better limited.

The limiting wall 12b may be integrally formed with the flow equalizing portion 12, or may be fixedly disposed on the flow equalizing portion 12.

Further, one side of the lining tube 40 close to the flow equalizing part 12 is provided with a limiting groove 42, and the limiting wall 12b can extend into the limiting groove 42.

Referring to fig. 1 and 5, in the illustrated embodiment, the limiting groove 42 is formed on the right end surface of the lining tube 40 and on the outer circumferential surface of the lining tube 40, and the limiting wall 12b can easily extend into the limiting groove 42 when the lining tube 40 and the flow equalizing portion 12 are installed. The inner wall surface of the limiting wall 12b is attached to the groove wall of the limiting groove 42, so that the mounting positions of the lining pipe 40 and the flow equalizing part 12 can be limited, and compressed air between the outer peripheral surface of the flow equalizing part 12 and the inner wall of the exhaust channel 32 can be prevented from entering the confluence channel 41.

Optionally, a reinforcing wall 12c is arranged on one side of the flow equalizing part 12 close to the lining pipe 40, and the reinforcing wall 12c is arranged to be attached to the sand inlet pipe 10.

Referring specifically to fig. 1 and 3, in the illustrated embodiment, the outer diameter of the reinforcing wall 12c is smaller the closer the inner liner 40 is. Since the reinforcing wall 12c is convex with respect to the sand inlet pipe 10, on the one hand, the reinforcing wall 12c can reduce the flow area of the confluence passage 41, which is advantageous for accelerating the compressed air, and on the other hand, since the outer diameter of the reinforcing wall 12c is tapered, the compressed air can be guided to flow toward the sand outlet pipe 20.

The reinforcing wall 12c can also reinforce the connection between the flow equalizing part 12 and the sand inlet pipe 10, so that the flow equalizing part 12 is prevented from shaking, displacing or being damaged due to the impact of compressed gas on the flow equalizing part 12.

Optionally, a sealing groove 43 is provided on the outer wall of the lining pipe 40 for mounting the first seal ring 1, thereby preventing the compressed air in the exhaust passage 32 from escaping through a gap between the lining pipe 40 and the exhaust passage 32.

After the liner tube 40 is installed in the exhaust passage 32, the seal groove 43 enters the exhaust passage 32. The first seal ring 1 can be made of flexible materials such as rubber and plastic, so that the first seal ring 1 is located in the seal groove 43, after the seal groove 43 enters the exhaust channel 32, the first seal ring 1 is compressed between the lining pipe 40 and the exhaust channel 32, the first seal ring 1 deforms, a gap between the lining pipe 40 and the exhaust channel 32 can be filled, and a sealing effect is achieved. The first sealing ring 1 can prevent the compressed air between the outer peripheral surface of the flow equalizing part 12 and the inner wall of the exhaust channel 32 from flowing out through the outlet of the exhaust channel 32.

The seal groove 43 can define the mounting position of the first seal ring 1 and also can prevent the first seal ring 1 from being displaced.

Optionally, the lining tube 40 is further provided with a mounting channel 44, and the mounting channel 44 is communicated with the outlet end of the confluence channel 41; at least part of the sand outlet pipe 20 is arranged in the installation channel 44.

The installation channel 44 is provided to enhance the connection between the sand discharge pipe 20 and the lining pipe 40.

Referring specifically to fig. 1, in the illustrated embodiment, the portions of the liner tube 40 provided with the confluence passages 41 are all located in the exhaust passage 32, and the portions of the liner tube 40 provided with the installation passages 44 are located in the exhaust passage 32 and protrude from the exhaust passage 32. As the sand pipe 20 extends into the installation passage 44, a portion of the sand pipe 20 is also in the exhaust passage 32. At this time, the sand inlet pipe 10, the sand outlet pipe 20, the gun barrel 30 and the lining pipe 40 have a close connection relationship, so that the whole sand blasting gun has a more stable structure, and is beneficial to the motion stability of the compressed gas and the sand.

Optionally, the closer to the confluence passage 41, the smaller the aperture of the installation passage 44; the head of the sand discharge pipe 20 provided in the installation passage 44 is smaller in outer diameter as it approaches the confluence passage 41. The tapered mounting channel 44 can facilitate the installation of the sand discharge pipe 20 and also calibrate the installation location of the sand discharge pipe 20. The head of the sand outlet pipe 20 is matched with the shape of the mounting channel 44, so that the sand outlet pipe 20 is attached to the mounting channel 44, and the connection stability of the sand outlet pipe and the mounting channel is further ensured.

Alternatively, the bore of the installation channel 44 is larger than the bore of the confluence channel 41, and the sand discharge pipe 20 abuts against a step between the installation channel 44 and the confluence channel 41. The step can limit the installation position of the sand pipe 20, and avoid the sand outlet pipe 20 from being installed in place or being installed excessively.

Optionally, the sand blasting gun provided by the present application further comprises a compression sleeve 50 for fastening the sand outlet pipe 20 and the lining pipe 40.

The pressing sleeve 50 can be sleeved outside the connection position of the sand outlet pipe 20 and the lining pipe 40, so that the sand outlet pipe 20 and the lining pipe are fastened, and the sand outlet pipe and the lining pipe are prevented from being separated in the using process. Alternatively, the compression sleeve 50 can completely cover the connection position of the sand production pipe 20 and the lining pipe 40 and extend outwards.

The pressing sleeve 50 can be welded outside the sand outlet pipe 20 and the lining pipe 40, and can also be fastened and connected with the sand outlet pipe 20 and the lining pipe 40 through a connector such as a screw. The present application does not limit the specific configuration of the compression sleeve 50 nor the specific manner of mounting the compression sleeve 50.

In one embodiment, the inner wall of the compression sleeve 50 is provided with internal threads 51, and the outer wall of the barrel 30 is provided with external threads 52; compression sleeve 50 is threadably connected to barrel 30 by internal threads 51 and external threads 52. At this time, the compressing sleeve 50 can fasten the connection among the sand outlet pipe 20, the lining pipe 40 and the barrel 30, and further ensure the structural stability of the whole sand blasting gun. In addition, the threaded connection is beneficial to the assembly and disassembly of the compression sleeve 50.

Further, referring to fig. 1 and 2, a supporting table 53 is arranged on one side of the pressing sleeve 50 close to the sand outlet pipe 20, a blocking table 54 is correspondingly arranged on the sand outlet pipe 20, and the supporting table 53 is close to and finally abuts against the blocking table 54 in the process of continuously matching and screwing the pressing sleeve 50 through the internal thread 51 and the external thread 52, so that the pressing sleeve 50 is favorably ensured to be installed in place and plays a fastening role.

Optionally, a flow blocking portion 13 is further disposed on the sand inlet pipe 10, and the air inlet channel 31 is located between the flow blocking portion 13 and the flow equalizing portion 12; the exhaust gas channel 32 between the flow-impeding part 13 and the flow-equalizing part 12 forms a gas collection area.

Referring to fig. 1, in the illustrated embodiment, the flow blocking portion 13 is protruded from the surface of the sand inlet pipe 10, and is similar to the flow equalizing portion 12 and disposed around the sand inlet pipe 10; the flow equalizing portion 12 is provided on the left side of the intake passage 31, and the flow blocking portion 13 is provided on the right side of the intake passage 31. The choke portion 13 extends from the sand inlet pipe 10 toward the inner wall of the exhaust passage 32, and can block the flow of the compressed air toward the outlet of the exhaust passage 32.

The outer side wall of the choke portion 13 may be attached to the inner wall of the exhaust duct 32, and may have a gap with the inner wall of the exhaust duct 32.

After the compressed air enters the exhaust channel 32 through the intake channel 31, the compressed air is blocked by the flow blocking part 13, and most of the compressed air flows towards the flow equalizing part 12. When the gas is in the gas collecting area, the gas can be convoluted and gathered in the gas collecting area, and can fill the gas collecting area, thereby being beneficial to reducing the fluctuation of the air pressure and being beneficial to uniformly distributing the compressed gas flowing out through the flow guide holes 12 a.

The airflow circulation area of the air collection area can be adjusted by adjusting the distance between the flow blocking part 13 and the flow equalizing part 12, so that the flow speed and other parameters of the airflow can be conveniently adjusted and controlled.

Alternatively, the closer to the flow equalizing part 12 in the axial direction of the sand inlet pipe 10, the smaller the outer diameter of the flow blocking part 13.

Referring to fig. 1 and 3, in the illustrated embodiment, the flow blocking portion 13 is a trapezoidal ring, so that the flow area of the gas collecting region can be increased, and the connection stability between the flow blocking portion 13 and the sand inlet pipe 10 can be ensured.

The choke portion 13 may be integrally formed with the sand inlet pipe 10, or may be fixedly mounted on the sand inlet pipe 10.

The sand blasting gun provided by the application further comprises a second sealing ring 2 which is arranged between the flow blocking part 13 and the exhaust channel 32 and used for preventing compressed air in the exhaust channel 32 from overflowing through a gap between the flow blocking part 13 and the exhaust channel 32.

Referring to fig. 1 in particular, in the illustrated embodiment, the first sealing ring 1 is used for preventing compressed air from overflowing from the outlet of the exhaust channel 32, and the second sealing ring 2 is used for preventing compressed air from overflowing from the inlet of the exhaust channel 32, so that the compressed air in the exhaust channel 32 can be better sealed by the two sealing rings, thereby ensuring the stable flow of the compressed air and ensuring the use effect.

Different from the first sealing ring 1, the second sealing ring 2 is sleeved on the sand inlet pipe 10, and the second sealing ring 2 abuts against the inlet of the exhaust passage 32. In order to define the position of the second sealing ring 2 and prevent the second sealing ring 2 from moving along the sand pipe 10, in an embodiment, a groove is provided on the sand pipe 10 for positioning the second sealing ring 2 so as to define the installation position of the second sealing ring 2. In another embodiment, referring to fig. 1, the left side of the second seal ring 2 abuts against the flow blocking portion 13, and the right side abuts against the pipe wall of the inlet of the exhaust passage 32, so that the installation position of the second seal ring 2 can be defined, the structure of the sand inlet pipe 10 can be simplified, and the installation position of the sand inlet pipe 10 in the exhaust passage 32 can be defined by the position state where the second seal ring 2 abuts against the flow blocking portion 13.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A sand blast gun, comprising:

the sand inlet pipe (10), wherein a sand inlet channel (11) is arranged in the sand inlet pipe (10);

the sand outlet pipe (20), a sand outlet channel (21) is arranged in the sand outlet pipe (20), and the sand outlet channel (21) is communicated with the sand inlet channel (11);

a barrel (30), wherein an air inlet channel (31) and an air outlet channel (32) are arranged in the barrel (30), and the air inlet channel (31) is communicated with the air outlet channel (32);

the sand inlet pipe (10) is provided with a converging channel (41), and the outlet end of the sand inlet pipe (10) is arranged in the converging channel (41);

at least part of the sand inlet pipe (10) is arranged in the exhaust channel (32), a flow equalizing part (12) is arranged on the sand inlet pipe (10), the flow equalizing part (12) is positioned between the air inlet channel (31) and the sand outlet pipe (20), and a flow guide hole (12 a) is formed in the flow equalizing part (12);

at least part of the lining pipe (40) is arranged in the exhaust channel (32), the inlet end of the confluence channel (41) is communicated with the flow guide hole (12 a), and the outlet end of the confluence channel (41) is communicated with the sand outlet channel (21);

compressed air enters the exhaust channel (32) through the air inlet channel (31) and flows towards the sand outlet pipe (20), the compressed air is limited by the flow equalizing part (12), the compressed air enters the confluence channel (41) through the flow guide holes (12 a), and negative pressure is formed in front of the outlet end of the sand inlet channel (11) after the compressed air passes through the confluence channel (41);

the sand material in the sand inlet channel (11) is sucked by negative pressure and can be flushed out of the sand outlet channel (21) along with compressed air.

2. The sand blast gun according to claim 1, wherein the sand outlet channel (21) comprises:

an inlet zone (21 a) communicating the sand inlet channel (11) and the confluence channel (41);

an outlet zone (21 b) communicating with said inlet zone (21 a);

from the sand inlet channel (11) to the outlet area (21 b), the caliber of the inlet area (21 a) is gradually reduced, and negative pressure is formed in the inlet area (21 a).

3. The sand blast gun according to claim 1, wherein the confluence passage (41) comprises:

an overflow area (41 a) communicated with the diversion hole (12 a);

a jet zone (41 b) communicating the overflow zone (41 a) and the sand channel (21);

from the diversion hole (12 a) to the jet flow area (41 b), the caliber of the overflow area (41 a) is gradually reduced.

4. The sand blast gun according to claim 1, wherein the flow equalizing portion (12) is a rectangular ring, the flow equalizing portion (12) is provided with a plurality of flow guiding holes (12 a), the flow guiding holes (12 a) are arranged at intervals along a circumferential direction, and a center of the circumference is located on an axis of the sand inlet channel (11).

5. The sand blast gun according to claim 4, wherein a side of the flow equalizing part (12) close to the lining pipe (40) is provided with a limiting wall (12 b), and the limiting wall (12 b) surrounds the diversion hole (12 a);

one side of the lining pipe (40) close to the flow equalizing part (12) is provided with a limiting groove (42), and the limiting wall (12 b) can extend into the limiting groove (42).

6. The sand blast gun according to claim 1, wherein the outer wall of the liner tube (40) is provided with a seal groove (43) for mounting the first seal ring (1) so as to prevent the compressed air in the discharge passage (32) from escaping through a gap between the liner tube (40) and the discharge passage (32).

7. The sand blast gun according to claim 1, wherein a mounting passage (44) is further provided in the liner tube (40), the mounting passage (44) communicating with an outlet end of the confluence passage (41);

at least part of the sand outlet pipe (20) is arranged in the installation channel (44).

8. The sand blast gun according to claim 7, further comprising a compression sleeve (50) for securing the sand discharge tube (20) and the inner liner tube (40).

9. The sand blast gun according to claim 1, wherein a flow blocking part (13) is further arranged on the sand inlet pipe (10), and the air inlet channel (31) is arranged between the flow blocking part (13) and the flow equalizing part (12);

the exhaust channel (32) between the flow-blocking section (13) and the flow-equalizing section (12) forms a gas collection area.

10. The sand blast gun according to claim 9, further comprising a second seal ring (2) provided between the flow blocking portion (13) and the discharge passage (32) for preventing compressed air in the discharge passage (32) from escaping through a gap between the flow blocking portion (13) and the discharge passage (32).

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