CN215804498U - Sand washing device - Google Patents

Abstract

The application provides a sand washing device, relates to oil development technical field. Wherein, this sand washing device includes: the first connecting pipe is used for connecting the coiled tubing; the second connecting pipe is relatively fixed with the lower end of the first connecting pipe; the upper end of the lower pressing body is rotatably connected with the lower end of the second connecting pipe, and the inner cavity of the lower pressing body is sequentially communicated with the inner cavities of the first connecting pipe and the second connecting pipe to form a flow inlet channel from top to bottom; the sand washing head is relatively fixed with the lower end of the lower pressing body and is provided with a sand washing pore passage communicated with the inflow channel; the sand washing pore passage is configured into a channel which is in a spiral streamline type from top to bottom. The technical scheme of this application can solve the sand washing effect that present sand washing head exists poor, the long technical problem of reciprocating operation time.

Description

Sand washing device

Technical Field

The application relates to the technical field of oil exploitation, in particular to a sand washing device.

Background

The hydraulic sand fracturing technology is more and more widely applied to yield increasing operation of a horizontal well at present, and in the construction process, the problem of sand blocking often occurs, so that fracturing fluid and propping agent cannot enter the stratum due to sand blocking, the fracturing construction effect is influenced, and the material is seriously wasted; meanwhile, the formed high pressure can damage ground equipment and pipelines, disturb normal construction processes, damage stratum seepage conditions, cause fracturing construction failure and possibly cause safety accidents.

After sand blockage occurs, blockage removal and sand washing operation is generally required to be performed immediately, the conventional process is to use a coiled tubing to lower a sand washing head to a sand blockage position for sand washing operation, but the currently used sand washing head has the problems of small overflowing discharge capacity, single sand washing direction and the like, so that the sand washing effect is poor, the reciprocating operation time is long, and the field use requirement cannot be met.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application aims to provide a sand washing device to solve the technical problems that the existing sand washing head is poor in sand washing effect and long in reciprocating operation time.

In order to solve the above technical problem, an embodiment of the present application provides the following technical solutions:

the application provides a sand washing device, this sand washing device includes: the first connecting pipe is used for connecting the coiled tubing;

the second connecting pipe is relatively fixed with the lower end of the first connecting pipe;

the upper end of the lower pressing body is rotatably connected with the lower end of the second connecting pipe, and the inner cavity of the lower pressing body is sequentially communicated with the inner cavities of the first connecting pipe and the second connecting pipe to form a flow inlet channel from top to bottom;

the sand washing head is relatively fixed with the lower end of the lower pressing body and is provided with a sand washing pore passage communicated with the inflow channel;

the sand washing pore passage is configured to be a channel in a conical spiral line shape from top to bottom, and the winding diameter of the sand washing pore passage is gradually increased from top to bottom.

In some variants of the application, the number of sand washing ports is 3, and they are arranged helically with the same pitch and diameter and coaxially with the sand washing head.

In some variations of the present application, the angle of taper of the sand wash port is 2.5 °.

In some variations of the present application, the second connecting tube has an inner annular land inside;

the upper end of the lower pressing body is provided with an outer ring platform, and the outer ring platform is matched with the inner cavity of the second connecting pipe and is lapped on the upper side of the inner ring platform.

In some modified embodiments of the present application, the method further includes: and the bearing body is arranged between the outer ring platform of the lower pressing body and the inner ring platform of the second connecting pipe.

In some variations of the present application, a first bearing retainer mounted between the inner race table and the bearing body and a second bearing retainer mounted between the outer race table and the bearing body.

In some modified embodiments of the present application, the lower end inner wall of the first connection pipe, the outer wall of the outer annular table, and the middle outer wall of the pressing body are respectively provided with a sealing groove for accommodating a sealing ring.

In some modified embodiments of the present application, the upper end surface of the outer ring table of the hold-down body has a plurality of tool holes.

In some modified embodiments of the present application, the upper end of the sand washing head has a connecting groove, and the connecting groove is respectively communicated with the inflow channel and the sand washing hole;

the groove wall of the connecting groove is provided with internal threads and is used for being in threaded connection with external threads on the outer wall of the lower end of the lower pressing body;

and the side part of the connecting groove is provided with a threaded hole for connecting a set screw so as to lock the sand flushing head and the lower pressing body.

In some modified embodiments of the present application, the method further includes: the lower end face of the second connecting pipe is provided with an outer ring groove, and the red copper sleeve is accommodated in the outer ring groove;

when the sand flushing head is locked with the lower pressing body, the upper end face of the sand flushing head is in contact with the red copper sleeve.

Compared with the prior art, the sand washing device provided by the application is mainly composed of a first connecting pipe, a second connecting pipe, a lower pressing body and a sand washing head which are sequentially connected from top to bottom, inner cavities of the first connecting pipe, the second connecting pipe and the lower pressing body are sequentially communicated to form an inflow channel which can be used for flowing sand washing liquid from top to bottom, and 3 sand washing pore canals which are communicated with the inflow channel and are in a conical spiral line shape from top to bottom are arranged on the sand washing head. Through setting up the frictional resistance that produces when reduction towards sand head and the co-rotation of pushing down the body that the bearing body can be by a wide margin, can avoid the condition that the tubular column winding auto-lock caused the card of hindering, and be favorable to towards the high-speed rotation of sand head.

Drawings

The above and other objects, features and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings and in which like reference numerals refer to similar or corresponding parts and in which:

fig. 1 schematically shows a half-section structure schematic diagram of a sand washing device provided by an embodiment of the utility model;

fig. 2 schematically shows a schematic top structural view of a first connecting pipe of a sand washing device provided by the embodiment of the utility model;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is a schematic top view of a pressing body of the sand washing device according to the embodiment of the utility model;

FIG. 5 is a schematic cross-sectional view taken along line A-A of FIG. 4;

fig. 6 schematically shows a main structure diagram of a sand washing head of the sand washing device provided by the embodiment of the utility model;

fig. 7 is a perspective schematic structural view schematically illustrating a sand washing head of the sand washing device provided by the embodiment of the utility model;

fig. 8 is a front view schematically illustrating a sand washing head of the sand washing device according to the embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view taken along line A-A of FIG. 8;

FIG. 10 is a schematic cross-sectional view of section B-B of FIG. 8;

FIG. 11 is a schematic cross-sectional view of section C-C of FIG. 8;

FIG. 12 is a schematic cross-sectional view of section D-D of FIG. 8;

fig. 13 is a schematic top view illustrating a copper bushing of the sand washing device according to the embodiment of the present invention;

FIG. 14 is a schematic cross-sectional view taken along line A-A of FIG. 13;

the reference numbers illustrate:

the bearing comprises a first connecting pipe 1, a second connecting pipe 2, an inner ring platform 201, an outer ring groove 202, a lower pressing body 3, an outer ring platform 301, a tool hole 302, a sand washing head 4, a sand washing pore channel 401, a connecting groove 402, a threaded hole 403, a bearing body 5, a first bearing retainer 6, a second bearing retainer 7, a red copper sleeve 8, a sealing ring 9 and a sealing groove 10.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which this application belongs.

Example one

Referring to fig. 1 to 14, a sand washing apparatus according to an embodiment of the present invention includes: the first connecting pipe 1 is used for connecting a coiled tubing; a second connection pipe 2 fixed to a lower end of the first connection pipe 1; the upper end of the lower pressing body 3 is rotatably connected with the lower end of the second connecting pipe 2, and the inner cavity of the lower pressing body is sequentially communicated with the inner cavities of the first connecting pipe 1 and the second connecting pipe 2 to form a top-down flow inlet channel; the sand washing head 4 is relatively fixed with the lower end of the lower pressing body 3 and is provided with a sand washing pore passage 401 communicated with the inflow channel; the sand washing duct 401 is configured as a channel in a conical spiral line shape from top to bottom, and the winding diameter of the sand washing duct 401 gradually increases from top to bottom.

Specifically, the sand washing device that this embodiment provided mainly includes: the sand washing device comprises a first connecting pipe 1, a second connecting pipe 2, a lower pressing body 3 and a sand washing head 4 which are sequentially connected from top to bottom; wherein, first connecting pipe 1 can adopt 42CrMo alloy steel material to process, first connecting pipe 1 and second connecting pipe 2 can adopt threaded connection's connected mode, refer to figure 3, the internal thread of the upper end of first connecting pipe 1 can adopt the design of AMMT quick-connect buckle, be convenient for carry out the high-speed joint with coiled tubing, also can carry out the self sealss simultaneously, the lower extreme of first connecting pipe 1 can adopt the structural design of ordinary internal thread with the sealing washer, it is provided with sealed slot 10 just to be located ordinary internal thread upside in first connecting pipe 1, be used for holding sealing washer 9, be used for with the external screw thread connection of the upper end of second connecting pipe 2, and the installation is adopted screw thread fastening to glue and is locking. The lower pressing body 3 is rotatably connected with the lower end of the second connecting pipe 2, and the inner cavities of the first connecting pipe 1, the second connecting pipe 2 and the lower pressing body 3 are sequentially communicated to form a flow inlet channel for sand washing liquid to flow from top to bottom; the lower pressing body 3 can be made of 42CrMo alloy steel material; towards sand head 4 and lower pressure body 3 adopt the mode of can dismantling the connection with the two fixed connection, for example: the connection manner may be a screw connection, but is not limited thereto, and the specific connection manner is not particularly limited thereto, and will be described in detail below. The sand washing head 4 is provided with a sand washing hole 401 communicated with the inflow channel, sand washing liquid can be ejected out through the outlet end at the lower end of the sand washing hole 401, and the number of the sand washing holes 401 can be set to be a plurality, for example: there may be, but are not limited to, 3 sand wash channels 401 arranged to increase the displacement and efficiency of the washing operation. In order to further improve the sand washing effect, in the technical scheme adopted in this embodiment, referring to fig. 7, the sand washing duct 401 is configured as a spiral passage from top to bottom, the spiral duct has a taper expanding outward, the winding diameter of the spiral duct gradually increases from top to bottom, the sand washing liquid can be used for directly driving and accelerating the rotation of the sand washing head 4, the sand washing liquid sprayed from the outlet end at the lower end of the sand washing head can be obliquely ejected, and the accumulated sand can be directly washed, so that the effect of omnibearing washing without dead angles is achieved; taking the configuration of 3 sand washing channels 401 as an example, the sand washing head 4 may adopt a cast steel ZG340-640 material to perform casting preliminary molding on 3 conical spiral flow-shaped sand washing channels 401, and specifically, the spiral flow line parameters of the sand washing channels 401 may be specifically configured as follows: the thread pitch is 75mm, the taper flaring angle is 2.5 degrees, the diameter of the duct is 3mm, and the specific parameters of the sand washing duct 401 are not limited to the configuration mode; in order to reduce the friction force of the tool when the tool is put into the well, referring to fig. 6, the lower end surface of the sand washing head 4 can be configured to be a spherical surface, and after the mechanical processing of the sand washing head 4 is completed, in order to increase the wear resistance of the lower end of the sand washing head 4, the surface of the ball head can be subjected to high-frequency quenching treatment or surface chromium plating of 150-.

When sand washing operation is carried out, a tool is well connected with the lowest external thread of the coiled tubing string through the internal thread arranged at the upper end of the first connecting pipe 1, then the coiled tubing truck group is used for descending to a sand blocking position (sand washing can be carried out while descending in the descending process), high-pressure sand washing liquid is pumped from the interior of the coiled tubing, the sand washing liquid sequentially passes through the inflow channel and the designed sand washing pore channel 401, when the sand washing liquid passes through the sand washing pore channel 401 in a conical spiral line shape, the rotation of the sand washing head 4 can be pushed and accelerated, meanwhile, the sand washing liquid can be obliquely ejected at the outlet end of the sand washing pore channel 401 to carry out all-directional washing on accumulated sand, the sand carrying liquid is returned to a well head through the annular space between the coiled tubing and the production tubing, and finally the blocking and unblocking operation is finished.

According to the above list, the embodiment of the utility model provides a sand washing device, which mainly comprises a first connecting pipe 1, a second connecting pipe 2, a lower pressing body 3 and a sand washing head 4 which are sequentially connected from top to bottom, wherein inner cavities of the first connecting pipe 1, the second connecting pipe 2 and the lower pressing body 3 are sequentially communicated to form an inflow channel which can be used for flowing sand washing liquid from top to bottom, and the sand washing head 4 is provided with a sand washing pore channel 401 which is communicated with the inflow channel and is in a conical spiral shape from top to bottom, so that the sand washing liquid can be used for directly driving and accelerating the rotation of the sand washing head 4, jet flow can be obliquely generated, accumulated sand is directly washed in an all-around way without dead angles, the sand washing effect can be improved, the reciprocating washing is avoided, the operation time is saved, the construction risk is reduced, and the operation efficiency is improved.

Further, referring to fig. 7-12, in the specific implementation, the number of the sand flushing ports 401 is 3, and the sand flushing ports are arranged in a spiral manner with the same pitch and diameter and coaxial with the sand flushing head 4.

Specifically, in order to improve the sand washing efficiency, the technical scheme adopted by the utility model can be provided with 3 sand washing pore channels 401, so that the sand washing operation of a large-displacement machine can be realized, the sand carrying capacity of sand washing liquid is improved, the flowback of large-particle substances is facilitated, and the blockage removing effect is enhanced; meanwhile, in order to improve the stability of the rotation of the sand washing head 4, the 3 sand washing channels 401 are uniformly distributed, the pitch and the winding diameter of each sand washing channel 401 are equal, and the spiral axis of each sand washing channel is superposed with the central axis of the sand washing head 4, specifically referring to the attached drawing 7, so that the rotation of the sand washing head 4 is more stable.

Further, referring to fig. 1 and 5, in a specific implementation, the second connection pipe 2 has an inner ring platform 201 inside; the upper end of the lower pressing body 3 is provided with an outer ring platform 301, and the outer ring platform 301 is matched with the inner cavity of the second connecting pipe 2 and is lapped on the upper side of the inner ring platform 201.

Further, referring to fig. 1, in a specific implementation, the sand washing apparatus provided in this embodiment further includes: and a bearing body 5 disposed between an outer ring stage 301 of the pressing body 3 and the inner ring stage 201 of the second connection pipe 2.

Specifically, in this embodiment, the inner annular platform 201 is disposed inside the lower end of the second connecting pipe 2, the outer annular platform 301 is correspondingly disposed outside the upper end of the pressing body 3, and the outer annular platform 301 is adapted to the inner cavity of the main body of the second connecting pipe 2, when the pressing body 3 is installed, the pressing body 3 is installed inside the inner cavity of the second connecting pipe 2 from top to bottom, so that the outer annular platform 301 of the pressing body 3 is located on the upper side of the inner annular platform 201 of the second connecting pipe 2; in order to reduce the friction when the sand washing head 4 and the lower pressing body 3 rotate together, in the technical scheme adopted by the utility model, the bearing body 5 can be arranged between the outer ring platform 301 of the lower pressing body 3 and the inner ring platform 201 of the second connecting pipe 2, the bearing body 5 can comprise a plurality of bearing monomers, the friction resistance generated when the sand washing head 4 and the lower pressing body 3 rotate together can be greatly reduced by arranging the bearing body 5, the blocking condition caused by winding and self-locking of a pipe column can be avoided, and the high-speed rotation of the sand washing head 4 is facilitated. Further, referring to fig. 1 and 5, by respectively providing a sealing groove 10 on an outer wall of the outer ring table 301 and an outer wall of a middle portion of the pressing body 3, and providing a sealing ring 9 in the sealing groove 10, the self-sealing of the bearing body 5 can be realized, the service life of the bearing body 5 can be prolonged, and the sealing ring 9 may specifically be an O-ring 9; when the lower pressing body 3 is processed, the surface chrome plating of 150 and 200 μm is required to be performed at the groove surfaces of the two sealing grooves 10 of the lower pressing body 3.

Further, referring to fig. 1, in an implementation, a first bearing retainer 6 and a second bearing retainer 7, the first bearing retainer 6 is installed between the inner ring platform 201 and the bearing body 5, and the second bearing retainer 7 is installed between the outer ring platform 301 and the bearing body 5.

Specifically, in the technical scheme adopted by the utility model, the upper end surface and the lower end surface of the bearing body 5 are respectively provided with the first bearing retainer 6 and the second bearing retainer 7, the first bearing retainer 6 and the second bearing retainer 7 can be processed by adopting GCr15 material, and the hardness requirement of the material after heat treatment is HRC 40-45.

Further, referring to fig. 4 and 5, in an implementation, the upper end surface of the outer ring table 301 of the lower press body 3 is provided with a plurality of tool holes 302.

Specifically, because the lower pressing body 3 can rotate relative to the second connecting pipe 2, when the sand washing head 4 is connected with the lower pressing body 3, in order to avoid the rotation of the lower pressing body 3, in the technical scheme adopted by the utility model, a plurality of tool holes 302 can be arranged on the upper end surface of an outer ring platform 301 of the lower pressing body 3, specifically, 4 tool holes 302 can be arranged, when the sand washing head 4 is installed, a tool is inserted into the plurality of tool holes 302 of the lower pressing body 3 to be fixed, so that the sand washing head 4 and the lower pressing body 3 can be reliably installed; the specific shape and number of the tool holes 302 are not particularly limited.

Further, referring to fig. 7 and fig. 9, in an implementation, the upper end of the sand washing head 4 has a connecting groove 402, and the connecting groove 402 is respectively communicated with the inflow channel and the sand washing hole 401; the groove wall of the connecting groove 402 is provided with an internal thread for being in threaded connection with an external thread on the outer wall of the lower end of the lower pressing body 3; the side of the connecting groove 402 has a threaded hole 403 for connecting a set screw to lock the sand washing head 4 and the lower pressure body 3.

Specifically, in order to realize the relative fixed connection of the sand washing head 4 and the lower pressing body 3, in the technical scheme adopted by the utility model, the upper end of the sand washing head 4 is provided with a connecting groove 402, the connecting groove 402 can be communicated with the inflow channel and the sand washing duct 401, and an internal thread is processed in the connecting groove 402 and can realize threaded connection with an external thread on the outer wall of the lower end of the lower pressing body 3; because the sand washing head 4 and the lower pressing body 3 need to rotate at high speed in the sand washing operation, in order to further lock the lower pressing body 3 and the sand washing head 4, the side part of the connecting groove 402 can be provided with a threaded hole 403 which can be respectively connected with a set screw so as to realize the reliable locking and fixing of the sand washing head 4 and the lower pressing body 3; in order to ensure the reliability of the connection between the pressing body 3 and the sand washing head 4, referring to fig. 7, the number of the threaded holes 403 may be two, and the two threaded holes 403 are symmetrically arranged with respect to the sand washing head 4; it should be noted that the threads in the connecting slot 402 and the threaded hole 403 are not shown in fig. 7.

Further, referring to fig. 1, 13 and 14, in a specific implementation, the sand washing apparatus according to this embodiment further includes: a red copper sleeve 8, wherein the lower end face of the second connecting pipe 2 is provided with an outer ring groove 202, and the red copper sleeve 8 is accommodated in the outer ring groove 202; when the sand flushing head 4 is locked with the lower pressing body 3, the upper end face of the sand flushing head 4 is in contact with the red copper sleeve 8.

Specifically, in order to reduce friction between the sand flushing head 4 and the second connecting pipe 2, in the technical scheme adopted by the utility model, an outer ring groove 202 is arranged on the lower end surface of the second connecting pipe 2, the red copper sleeve 8 is arranged in the outer ring groove 202, after the sand flushing head 4 is arranged and the sand flushing head 4 is in threaded connection with the lower pressing body 3, the upper end surface of the sand flushing head 4 is in contact with the lower end surface of the red copper sleeve 8, after the pretightening force of the bearing is adjusted, the sand flushing head 4 and the lower pressing body 3 are locked and fixed through a set screw, and when the sand flushing head 4 rotates in the punching operation, the red copper sleeve 8 can effectively play a role in reducing the friction between the sand flushing head 4 and the second connecting pipe 2; the red copper sleeve 8 can be made of red copper materials, the tolerance of the inner diameter of the red copper sleeve can adopt interference fit M7, and the requirement of the smoothness of two end surfaces of the red copper sleeve 8 can be set to be 0.8 mu M.

When the sand washing device provided by the embodiment is assembled, firstly, the red copper bush 8 is installed in the outer ring groove 202 at the lower end of the second connecting pipe 2 in a hot-fitting manner; the second connecting pipe 2 is erected on the assembling platform, then the second bearing retainer 7 is arranged at the upper part of the inner ring platform 201 of the second connecting pipe 2, after the No. 2 lithium grease is coated on the bearing body 5, the bearing body 5 is adhered to the upper end surface of the second bearing retainer 7, the first bearing retainer 6 is arranged in the second connecting pipe 2, and the lower end surface of the first bearing retainer 6 is in close contact with the bearing body 5; two sealing rings 9 are respectively arranged in a sealing groove 10 on an outer ring platform 301 of the lower pressing body 3 and a sealing groove 10 in the middle of the lower pressing body 3, and then the outer ring platform 301 of the lower pressing body 3 with the sealing rings 9 arranged is upwards arranged from an upper end hole of the second connecting pipe 2, so that the outer ring platform 301 of the lower pressing body 3 is in close contact with the upper end surface of the first bearing retainer 6; the tool is inserted into a plurality of tool holes 302 on the upper end surface of an outer ring platform 301 of the lower pressing body 3 to be fixed, the upper internal thread of the sand washing head 4 is in threaded connection with the lower external thread of the lower pressing body 3, the upper end surface of the sand washing head 4 is in contact with the lower end surface of the red copper sleeve 8, and after the pretightening force of the bearing body 5 is adjusted, the bearing body is installed in a threaded hole 403 of the sand washing head 4 by using a set screw so as to lock and fix the sand washing head 4 and the lower pressing body 3; and (3) a sealing ring 9 is arranged in a sealing groove 10 at the lower end of the first connecting pipe 1, thread fastening glue is uniformly coated on the internal thread at the lower end of the first connecting pipe 1, the assembled external thread at the upper end of the second connecting pipe 2 is connected with the internal thread at the lower end of the first connecting pipe 1 and is screwed up according to specified torque, and the sand washing device is assembled.

It should be noted that in the description of the present specification, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A sand washing device, comprising:

the first connecting pipe is used for connecting the coiled tubing;

the second connecting pipe is relatively fixed with the lower end of the first connecting pipe;

the upper end of the lower pressing body is rotatably connected with the lower end of the second connecting pipe, and the inner cavity of the lower pressing body is sequentially communicated with the inner cavities of the first connecting pipe and the second connecting pipe to form a flow inlet channel from top to bottom;

the sand washing head is relatively fixed with the lower end of the lower pressing body and is provided with a sand washing pore passage communicated with the inflow channel;

the sand washing pore passage is configured to be a channel in a conical spiral line shape from top to bottom, and the winding diameter of the sand washing pore passage is gradually increased from top to bottom.

2. A sand washing device according to claim 1,

the number of the sand washing pore canals is 3, and the sand washing pore canals and the sand washing head are coaxially and spirally arranged with the same pitch and winding diameter.

3. A sand washing device according to claim 2,

the taper angle of the sand washing duct is 2.5 degrees.

4. A sand washing device according to claim 1,

the second connecting pipe is internally provided with an inner annular table;

the upper end of the lower pressing body is provided with an outer ring platform, and the outer ring platform is matched with the inner cavity of the second connecting pipe and is lapped on the upper side of the inner ring platform.

5. A sand washing device according to claim 4, further comprising:

and the bearing body is arranged between the outer ring platform of the lower pressing body and the inner ring platform of the second connecting pipe.

6. A sand washing device according to claim 5, further comprising:

the bearing comprises a first bearing retainer and a second bearing retainer, wherein the first bearing retainer is arranged between the inner ring platform and the bearing body, and the second bearing retainer is arranged between the outer ring platform and the bearing body.

7. A sand washing device according to claim 4,

the lower end inner wall of the first connecting pipe, the outer wall of the outer ring platform and the middle outer wall of the lower pressing body are respectively provided with a sealing groove for accommodating a sealing ring.

8. A sand washing device according to claim 4,

the upper end face of the outer ring table of the lower pressing body is provided with a plurality of tool holes.

9. A sand washing device according to claim 1,

the upper end of the sand washing head is provided with a connecting groove which is respectively communicated with the inflow channel and the sand washing pore passage;

the groove wall of the connecting groove is provided with internal threads and is used for being in threaded connection with external threads on the outer wall of the lower end of the lower pressing body;

and the side part of the connecting groove is provided with a threaded hole for connecting a set screw so as to lock the sand flushing head and the lower pressing body.

10. A sand washing device according to claim 9, further comprising:

the lower end face of the second connecting pipe is provided with an outer ring groove, and the red copper sleeve is accommodated in the outer ring groove;

when the sand flushing head is locked with the lower pressing body, the upper end face of the sand flushing head is in contact with the red copper sleeve.

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