CN213926330U - Small-aperture double-slurry mixer - Google Patents

Abstract

The application discloses two thick liquid blenders of aperture, including the shell body, fixed the setting is in be used for in the shell body dividing into the reverse valve of independent and inclosed first passageway and second passageway with the shell body inner chamber, reverse valve has one-way conduction the case of first passageway, first passageway and second passageway are terminal through setting up in the hybrid chamber intercommunication of shell body afterbody, the hybrid chamber has the structure of expanding and axial cross section along fluid flow direction convergence gradually. This application is fixed through the hydraulic plug, can fix the blender in appointed degree of depth section position for the pertinence and the accuracy that the water was gushed in two thick liquid shutoff are higher. The mixer adopts near the target area to mix the cement paste and the water glass paste, can solve simultaneously and solidify in advance and lead to stifled pipe and the downthehole inhomogeneous problem of mixing of two thick liquid, the targeted solution is two thick liquid and is poured the industry pain point and the technological difficulty in the shutoff technique.

Description

Small-aperture double-slurry mixer

Technical Field

The utility model relates to a water conservancy geological processing technology field especially relates to the required instrument field of geological grouting drilling, concretely relates to two liquid thick liquids mixers of aperture.

Background

Before grouting construction is carried out on a target area, drilling needs to be carried out, and a channel for slurry to enter is used in subsequent grouting operation. In the drilling process, water gushing, hole collapse and other phenomena may occur in different geological environments, and particularly, water gushing occurs in the drilling process, so that the drilling operation is greatly not facilitated. The water gushing problem is not effectively controlled and solved, and the preset drilling depth can not be achieved, and even underground hole collapse can be caused. In order to avoid the problem that the drilling cannot be continued due to water burst in the drilling process, in the prior art, slurry is mostly adopted and added to be matched with the drilling construction, so that the underground pressure is balanced, meanwhile, the slurry can form wall protection in the drilling process, and the problems of water burst and hole collapse are avoided. However, when severe gushing conditions are encountered, then conventional muds have been unable to read the gushing water to effect plugging, requiring the cooperation of water glass grout and cement slurry for downhole plugging gushing water to avoid hole collapse and enable continued drilling to the specified depth.

However, in order to realize plugging under a large water burst condition, the water glass slurry and the cement slurry need to be sent to a specified depth according to a specified proportion, so that effective plugging on water burst can be realized, and a tool capable of accurately mixing the water glass solution and the cement slurry under a hole with a specified depth is needed.

Prior art 1: chinese patent No. CN205314085U discloses a two-fluid grouting system for cement and water glass solution, which comprises a pipe a, a pipe B and a pipe C; the pipe A is a sleeve valve pipe for injecting cement paste; the pipe B is used for injecting water glass, and the pipe C is used for injecting casing slurry. The technology has a simple structure, is only suitable for plugging a drill hole with shallow depth, and can not realize accurate control on the water burst plugging with specified depth.

Prior art 2: the invention patent application with the publication number of CN106639973A discloses a grouting structure for surface ultra-deep hole double-liquid grouting and a grouting method thereof, and provides a double-liquid grouting structure. The basic principle of the method is that cement paste and water glass slurry are independently delivered into a hole with a specified depth, a stopper is used for taking a limited section of hole space as a mixing cavity, and the independent cement paste and the independent water glass slurry are delivered into the mixing cavity to realize mixing. Although prior art 2 is more scientific than prior art 1 and can reach a greater depth, its drawbacks are also very obvious and mainly appear as follows: first, the water glass slurry and the cement slurry, which are manually fed, cannot be mixed in a predetermined ratio due to various slurry impurities in the pores, which are mixed in the pores. Secondly, the natural mixing of the inner space of the hole is adopted, and no control mechanism for ensuring the uniformity of the double-slurry mixing is provided, so that the uneven mixing is easily caused, and the advantage of double-slurry filling is lost.

SUMMERY OF THE UTILITY MODEL

In order to solve prior art and realize gushing the easy jam of mixing in advance that water shutoff in-process exists in the two thick liquid drilling that adopt water glass thick liquid and cement thick liquid, mix after filling and can not guarantee the degree of consistency, and it is shallow to be suitable for the degree of depth, control accuracy is low, can not realize the problem of the accurate shutoff of specific degree of depth section, the application provides a two thick liquid blender of aperture, can realize the accurate thick liquid that send of specific degree of depth section, send into the target area immediately after utilizing the two thick liquid proportion mixes of predetermineeing, it solidifies the jam easily to have solved mixing in advance, and can't be the problem of accuse mixing proportion and homogeneous degree in the downthehole mixing of target area. This application adopts and to mix in the blender before sending into the target hole with two thick liquids, can ensure through the mixing chamber of the inside setting of blender that two thick liquids are abundant, even mixture according to preset proportion, send into the appointed degree of depth section of target hole immediately after mixing for all mixed thick liquids are all sent to appointed degree of depth section downtheholely, and the problem of water shutoff is gushed in the pertinence solution. Adopt the two thick liquids blender consumption thick liquids total amount of this application few, the shutoff is effectual. The expected plugging effect can be achieved by one-time pipe laying, the problem of water burst in drilling is solved, and the phenomenon of water burst and hole collapse is fundamentally avoided.

In order to achieve the purpose, the technical scheme adopted by the application is as follows:

a small-aperture double-slurry mixer comprises an outer shell and a reverse valve fixedly arranged in the outer shell and used for dividing an inner cavity of the outer shell into a first channel and a second channel which are independent and closed, wherein the reverse valve is provided with a valve core for conducting the first channel in a one-way mode, the tail ends of the first channel and the second channel are communicated through a mixing cavity arranged at the tail of the outer shell, the mixing cavity is provided with an expanding structure, and the axial section of the mixing cavity gradually converges along the flowing direction of a fluid;

the inlet end of the first channel is connected with a cement slurry inlet pipe, and the outlet end of the first channel is close to the mixing cavity and is arranged in a converging manner along the axial section of the fluid flowing direction; the inlet end of the second channel is connected with a water glass slurry inlet pipe, the outlet end of the second channel is provided with a wire drawing nozzle, and the mixing cavity is connected with a mixed slurry outlet pipe.

Slurry mixing principle: as for the principle of cement slurry conveying in the first channel, cement slurry is pressurized by the slurry conveying pump and then sequentially reaches the valve core position from the cement slurry inlet pipe and the reverse valve, and the valve core has the function of blocking the cement slurry from entering, when the pressure of the cement slurry conveyed by the slurry conveying pump is greater than the pressure of the valve core, the cement slurry overcomes the resistance of the valve core and enters the valve core and then enters the mixing cavity. Meanwhile, the water glass is pressurized and conveyed into the water glass slurry inlet pipe through the slurry conveying pump so as to enter the second channel, and finally the water glass is conveyed into the mixing cavity through the wire drawing nozzle according to a preset form and mixed with the cement slurry in the first channel. The wire drawing nozzle has the function of preventing backflow, and the problem that the water glass pipeline is blocked due to the fact that cement slurry flows back into the wire drawing nozzle after pressurization of the water glass pipeline is stopped is avoided. Because the hybrid chamber has the structure of expanding, can reduce the velocity of flow after grout gets into the structure of expanding and fully mix with the sodium silicate thick liquid after the wire drawing, moreover, the hybrid chamber is the convergence structure setting along fluid circulation direction, further forms the extrusion to the thick liquid after the mixture, changes the misce bene state of mixed thick liquid, further promotes thick liquid misce bene degree. The double-slurry is fully mixed in the mixing cavity and then enters the preset depth section in the hole through the slurry mixing outlet pipe to be used for plugging the hole wall of the water burst hole section.

It is worth noting that the proportion of the double-slurry mixing is irrelevant to the mixer provided by the present application, and the preset proportion is determined by the delivery flow rates of the delivery pumps respectively providing the cement slurry and the water glass slurry. Regarding the depth of delivery, the grout pipe is advanced with the drilling rod defeated thick liquid pipeline intercommunication to the grout of the blender that this application provided, can be according to actual construction demand down to the mixed double thick liquid of appointed degree of depth, is not restricted to shallow surface layer and mixes thick liquid and send thick liquid. In order to improve the stability, the mixer can be fixed by matching with the existing water pressure plug pipe, so that the effect of accurate plugging can be better exerted.

As the preferred scheme that sets up of this application, first passageway advances thick liquid pipe, case and intercommunication by the grout that connects gradually the grout pipe of penetrating of hybrid chamber is constituteed, the case include high pressure spring, and with high pressure spring supports to lean on the steel ball that the contact is used for preventing the grout backward flow, penetrate the inside grout flow direction of following of pipe gradually converge and with the crossing critical plane of hybrid chamber is minimum cross section. The spherical steel ball is adopted as the valve element member, so that the effects of reliable sealing and backflow prevention can be provided in cement slurry containing granular impurities, the steel ball is sealed by a line, particles in the cement slurry can be naturally avoided, and the valve element has better practicability and environmental adaptability compared with a one-way valve with a sealed surface. The inner channel is arranged to form the convergent grout injection pipe, so that the grout can be accelerated when flowing in the grout injection pipe, the cross section of the grout leaving the grout injection pipe and passing through the grout injection pipe at the moment is the smallest, the flow rate of the grout is the fastest at the moment, when the grout enters the mixing cavity at the maximum speed, local negative pressure can be formed, the grout is sucked into the side of the grout injection pipe at the moment to form local rotational flow, the internal rotational flow is similar to the Venturi effect, and the grout injection pipe can play a positive promoting role in fully mixing the grout and the cement grout. After the rotational flow, the mixing cavity is expanded compared with the slurry injection pipe and can be rapidly decelerated, a limited turbulence effect is formed in the mixing cavity, and the slurry is further uniformly mixed by matching with the mixing cavity with the convergent tail section.

In order to further optimize the structural arrangement, preferably, the outer shell comprises a first shell section and a second shell section, the first shell section and the second shell section are connected through a connecting sleeve which is detachably and fixedly connected, the connecting sleeve is provided with a plurality of through holes which are communicated with the first shell section and the second shell section, and one end of any through hole, which is close to the mixing cavity, is provided with the wire drawing nozzle; the second channel consists of an annular space formed between the inner wall of the first shell section and the outer side wall of the first channel and a plurality of through holes; the first channel and the second channel are intersected in a mixing cavity arranged in the second shell section.

In order to further improve the mixing efficiency of the mixer, preferably, the second casing section is provided with a plurality of sets of helical guides alternately arranged on the pipe wall of the second casing section downstream of the mixing cavity along the fluid flow direction, and the directions of the helical guides of the adjacent two sets are opposite. After the double slurry is mixed by the mixing cavity, when the double slurry flows through the downstream pipe wall, the mixed double slurry flows along the guide of the spiral guide due to the contact with the spiral guide; however, the spiral guider is provided with a plurality of groups, and the guiding directions between two adjacent groups are opposite, namely the front group of spiral guider is used for guiding clockwise, the rear group of spiral guider is used for guiding anticlockwise, and so on. The circulation of the forward flow → the turbulent flow → the reverse flow → the turbulent flow → the forward flow is repeated while the mixed slurry flows, and the mixed slurry is mixed more uniformly after a plurality of circulations.

In order to better achieve the mixing effect and simplify the structural arrangement, it is preferable that any one set of the helical guides is composed of at least three helical blades which are located at the same axial position and are uniformly distributed on the inner wall of the second casing section. The guide direction of any helical blade of the same group is the same, and each helical blade is fixedly arranged on the pipe wall. The structure is compact, simple and reliable without any movable component.

In order to achieve targeted and accurate delivery of the double-slurry mixed slurry into a hole with a specified depth, on the basis of the structure, the double-slurry mixer preferably further comprises a hydraulic plug for fixing the double-slurry mixer, and a mixed slurry inlet pipe detachably and fixedly connected with the mixed slurry outlet pipe through a wire connector penetrates through the hydraulic plug; fixed and relative set up in mix thick liquid advances a pair of fixed joint on the thick liquid circumference lateral wall, connect two fixed joint's rubber tube to and set up arbitrary be used for the intercommunication on the fixed joint the rubber tube inner wall advances the water pressure stopper pipe in the space between the thick liquid outer wall with mixed thick liquid.

Preferably, a fixed joint which is not provided with a water pressure plug pipe is replaced by a movable joint which is fixedly connected with the rubber pipe, and the movable joint is connected with the outer side wall of the night milk inlet pipe in a sliding and sealing manner through the mixing pipe.

In order to satisfy the back and forth slip demand of activity structure, the sealed effect of realization that can be better simultaneously again, preferably, the activity connects the inside wall be provided with a plurality ofly with the sealing washer of mixed thick liquid advances the thick liquid pipe laminating. The mode that sets up the sealing washer can be further reduce the movable joint internal diameter and mix the thick liquid and advance the roughness requirement and the cooperation tolerance requirement between the thick liquid pipe external diameter for the processing degree of difficulty is lower, and follow-up convenient degree of maintaining is higher, and the maintenance cost is cheaper, and is convenient.

Has the advantages that:

this application is fixed through the hydraulic plug, can fix the blender in appointed degree of depth section position for the pertinence and the accuracy that the water was gushed in two thick liquid shutoff are higher. The mixer adopts near the target area to mix the cement paste and the water glass paste, can solve simultaneously and solidify in advance and lead to stifled pipe and the downthehole inhomogeneous problem of mixing of two thick liquid, the targeted solution is two thick liquid and is poured the industry pain point and the technological difficulty in the shutoff technique. Simultaneously, this application designs unique two thick liquid injection structure and hybrid chamber structure based on venturi principle, can realize the intensive mixing of thick liquid. Moreover, this application has still add multiunit spiral director very much, can realize the mixed action to the thick liquid by many gradients, ensures that the mixed thick liquid of output is even, abundant.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a schematic perspective view of a dual slurry mixer for use with a hydraulic plug;

FIG. 2 is an axial cross-sectional view of the mixer of FIG. 1;

FIG. 3 is an enlarged view of the structure of region A in FIG. 2 (a schematic view of the mixing of slurry by the venturi principle);

FIG. 4 is an enlarged view of the structure of region A in FIG. 2 (another embodiment);

FIG. 5 is an enlarged view of the structure in area B of FIG. 2;

FIG. 6 is an axial cross-sectional view of the hydraulic plug of FIG. 1;

FIG. 7 is a schematic structural view of a hydraulic plug in a fixed state;

FIG. 8 is a schematic structural view of example 5;

fig. 9 is an enlarged view of the structure of region C in fig. 8.

In the figure: 1-an outer shell; 2-water pressure plugging; 3-cement slurry inlet pipe; 4-a water glass slurry inlet pipe; 5-water pressure plug pipe; 6-a reverse valve; 7-steel ball; 8-a high-pressure spring; 9-connecting sleeves; 10-a through via; 11-a wire drawing nozzle; 12-a mixing chamber; 13-pair wire connectors; 14-slurry inlet pipe for mixed slurry; 15-fixing the joint; 16-a rubber tube; 17-a sealing ring; 18-a movable joint; 19-a slit; 20-ball check valve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

the small-aperture double-slurry mixer shown in the attached drawings 1-6 in the specification comprises an outer shell 1 and a reverse valve 6 fixedly arranged in the outer shell 1 and used for dividing an inner cavity of the outer shell 1 into a first channel and a second channel which are independent and closed, wherein the reverse valve 6 is provided with a valve core for conducting the first channel in a one-way mode, the tail ends of the first channel and the second channel are communicated through a mixing cavity 12 arranged at the tail part of the outer shell 1, the mixing cavity 12 is provided with an expanding structure, and the axial section of the mixing cavity is gradually converged along the flowing direction of a fluid;

the inlet end of the first channel is connected with a cement slurry inlet pipe 3, and the outlet end of the first channel is close to the mixing cavity 12 and is arranged in a converging manner along the axial section of the fluid flowing direction; the inlet end of the second channel is connected with a water glass slurry inlet pipe 4, the outlet end of the second channel is provided with a wire drawing nozzle 11, and the mixing cavity 12 is connected with a mixed slurry outlet pipe.

Slurry mixing principle: as for the principle of cement slurry conveying in the first channel, cement slurry is pressurized by a slurry conveying pump and then sequentially reaches the valve core position from a cement slurry inlet pipe 3 and a reverse valve 6, and as the valve core has the function of blocking the cement slurry from entering, when the pressure of the cement slurry conveyed by the slurry conveying pump is greater than the pressure of the valve core, the cement slurry overcomes the resistance of the valve core and enters the mixing cavity 12 after entering the valve core. Meanwhile, the water glass is pressurized and conveyed to the water glass slurry inlet pipe 4 through the slurry conveying pump, enters the second channel, and is finally conveyed into the mixing cavity 12 through the wire drawing nozzle 11 according to a preset form to be mixed with the cement slurry in the first channel. Because mixing chamber 12 has the structure of expanding, can reduce the velocity of flow after grout gets into the structure of expanding and fully mix with the sodium silicate thick liquid after the wire drawing, moreover, mixing chamber 12 is the convergence structure setting along the fluid circulation direction, further forms the extrusion to the thick liquid after the mixture, changes the misce bene state of mixed thick liquid, further promotes thick liquid misce bene degree. The double slurry is fully mixed in the mixing cavity 12 and then enters the hole through the slurry outlet pipe of the mixed slurry to form a preset depth section for plugging the hole wall of the water gushing hole section.

It is worth noting that the proportion of the double-slurry mixing is irrelevant to the mixer provided by the present application, and the preset proportion is determined by the delivery flow rates of the delivery pumps respectively providing the cement slurry and the water glass slurry. According to the concrete pouring requirement of cement-water glass double-liquid slurry, the pouring flow rate of the cement slurry is 60L/min, and the flow rate of the water glass slurry is about 15% of the cement slurry, namely the flow rate is 12L/min. According to a pipeline flow calculation formula, considering the relation between the liquid flow rate and the viscosity, the calculation formula is as follows:

Q＝πd⁴ρgP/(128μL)

wherein: q-flow, L/min; d-pipe diameter, m; a pi-circumference ratio; rho-fluid density/kg/m³；

g-acceleration of gravity, 9.8N/kg; p-pressure difference/MPa between two ends of the pipeline; μ -fluid viscosity/pas; l-pipe length/m.

The quantities in the formula are substituted into calculation, 64 nozzles are designed, Q is 3L/min, pi is 3.14, rho is 1.373kg/m3, P is 3MPa, mu is 1.8 Pa.s, and L is 15 m. The nozzle diameter d is calculated to be 1.504mm, and is selected to be 1.6mm in consideration of practical use. Indeed, the above data are the better data parameters obtained after practical verification by the applicant, and the content listed in this embodiment is only to illustrate the authenticity and reliability of the above data, and does not exclude the existence of other preferred parameter matching schemes.

Regarding the depth of delivery, the grout pipe 3 is advanced with the drilling rod defeated thick liquid pipeline intercommunication to the grout of the blender that this application provided, can be according to actual construction demand down to the mixed double thick liquid of appointed degree of depth, is not restricted to shallow surface layer and mixes thick liquid and send thick liquid. In order to improve the stability, the mixer can be fixed by matching with the existing water pressure plug pipe, so that the effect of accurate plugging can be better exerted.

Example 2:

the embodiment is an optimized design scheme, and specifically, on the basis of the structure and the principle of embodiment 1, further with reference to fig. 2, the first channel is composed of a cement slurry inlet pipe 3, a valve core and a slurry injection pipe communicated with the mixing cavity 12, which are sequentially connected, the valve core comprises a high-pressure spring 8 and a steel ball 7 which is in abutting contact with the high-pressure spring 8 and used for preventing backflow of cement slurry, the slurry injection pipe is internally gradually converged along the flow direction of the cement slurry, and a critical surface intersected with the mixing cavity 12 is a minimum cross section. The spherical steel ball is adopted as the valve element member, so that the effects of reliable sealing and backflow prevention can be provided in cement slurry containing granular impurities, the steel ball is sealed by a line, particles in the cement slurry can be naturally avoided, and the valve element has better practicability and environmental adaptability compared with a one-way valve with a sealed surface. The inner channel is arranged to form the convergent grout injection pipe, so that the grout can be accelerated when flowing in the grout injection pipe, the cross section of the grout leaving the grout injection pipe and passing through the grout injection pipe at the moment is the smallest, the flow rate of the grout is the fastest at the moment, when the grout enters the mixing cavity 12 at the maximum speed, local negative pressure can be formed, the grout sucking the side of the grout injection pipe at the moment forms local rotational flow, the internal rotational flow is similar to the Venturi effect, and the grout injection pipe can play a positive promoting role in fully mixing the grout injection pipe and the grout injection pipe. After the rotational flow, the mixing cavity 12 is expanded compared with the shooting pipe and then rapidly decelerated, a limited turbulent flow effect is formed in the mixing cavity 12, and then the mixing cavity 12 with a convergent tail section is matched, so that the slurry is further uniformly mixed. As shown in fig. 3.

On the basis of the above inventive concept, the present embodiment further provides another structure, specifically, as shown in fig. 4, a through hole is further disposed on the shooting pipe, the through hole is disposed closer to the end of the shooting pipe according to the venturi principle as the flow direction of the cement slurry in the shooting pipe is faster and faster, the water glass in the side space can more easily enter the shooting pipe to mix with the cement slurry, and when the cement slurry and the water glass slurry are mixed, they are ejected together into the mixing chamber 12, and the secondary mixing process shown in fig. 3 is repeated, so that the dual slurry mixing is more sufficient.

In this embodiment, the outer casing 1 includes a first casing section and a second casing section, the first casing section and the second casing section are connected by a detachable and fixedly connected connecting sleeve 9, the connecting sleeve 9 has a plurality of through holes 10 communicating the first casing section and the second casing section, and one end of any through hole 10 close to the mixing chamber 12 is provided with the wire drawing nozzle 11; the second channel consists of an annular space formed between the inner wall of the first shell section and the outer side wall of the first channel and a plurality of through holes 10; the first and second channels intersect in a mixing chamber 12 provided in the second housing section.

In order to further improve the mixing efficiency of the mixer, in this embodiment, the second casing section is provided with a plurality of sets of helical guides alternately arranged on the pipe wall of the second casing section downstream of the mixing chamber 12 in the fluid flow direction, and the directions of the helical guides of the adjacent sets of helical guides are opposite. After the double slurry is mixed by the mixing cavity 12, when the double slurry flows through the downstream pipe wall, the mixed double slurry flows along the guide of the spiral guide due to the contact with the spiral guide; however, the spiral guider is provided with a plurality of groups, and the guiding directions between two adjacent groups are opposite, namely the front group of spiral guider is used for guiding clockwise, the rear group of spiral guider is used for guiding anticlockwise, and so on. The circulation of the mixed slurry flow → the forward flow → the turbulent flow → the reverse flow → the turbulent flow → the forward flow is repeated, as shown in fig. 5, and the arrow in fig. 5 indicates the spiral direction of the slurry flow, and the mixed slurry is mixed more uniformly after a plurality of circulations.

In order to better realize the mixing effect and simplify the structure, any group of the spiral guider at least consists of three spiral blades which are positioned at the same axial position and are uniformly distributed on the inner wall of the second shell section. The guide direction of any helical blade of the same group is the same, and each helical blade is fixedly arranged on the pipe wall. The structure is compact, simple and reliable without any movable component. It is worth noting that the greater the number of helical blades, the greater the resistance, which makes the flow slower; the larger the radial length of the helical blade is, the closer the helical blade is to the circle center position, the better the guiding and mixing effects are, and the larger the resistance is; and vice versa. Because of the adoption of multiple groups of guides, in order to be compatible with the uniformity of mixing and the fluidity of the slurry, a single group of three sheets is adopted, and the radial length of each sheet is preferably one fourth of the inner diameter of the pipe wall.

In this embodiment, the mixed slurry will undergo a maximum of three times of mixing, the first primary mixing being by suction mixing according to the venturi principle through the through-holes provided in the shooting pipe as shown in fig. 4; the second mixing is mixing in the mixing chamber 12, as shown in FIG. 3; the third mixing is mixing through a spiral guider, as shown in fig. 5, so that the sufficiency of double-slurry mixing can be ensured, the effectiveness of gushing water plugging is ensured, and the problem of poor plugging or secondary gushing water is solved.

Example 3:

the embodiment is a preferred embodiment of the present application, and is intended to achieve targeted and accurate delivery of a dual slurry mixed slurry into a hole with a specified depth, and on the basis of the above structure, the present application further includes a hydraulic plug 2 for fixing the dual slurry mixer, as shown in fig. 6 and 7, a mixed slurry inlet pipe 14 detachably and fixedly connected to the mixed slurry outlet pipe through a wire connector 13 is penetratingly arranged in the hydraulic plug 2; the fixed and relative setting in mix thick liquid advances a pair of fixed joint 15 on the thick liquid pipe 14 circumference lateral wall, connect two the rubber tube 16 of fixed joint 15 to and set up arbitrary fixed joint 15 is last to be used for the intercommunication the water pressure stopper pipe 5 in the space between the thick liquid pipe 14 outer wall is advanced to the rubber tube 16 inner wall and the mixed thick liquid.

The working principle is as follows: after the mixer is sent to a specified depth, clear water is conveyed into the water pressure plug pipe 5 through a pipeline by ground pressurization equipment, the rubber pipe 16 is continuously stressed and expanded with the increase of clear water injection, and the rubber pipe 16 is continuously expanded and enlarged under the action of water pressure until the rubber pipe is contacted with the hole wall because a closed structure is arranged between the fixed structure 15 and the mixed slurry inlet pipe 14. As shown in fig. 7, at this time, as the rubber tube 16 continuously increases, the outer surface of the rubber tube 16 collides with the hole wall to form a large extrusion force, so that the rubber tube 16 and the hole wall are stationary due to a large static friction force to perform a fixing function. At this time, the slurry mixed by the mixer enters the hole with the designated depth section through the slurry mixing inlet pipe 14 to implement water gushing blocking. Due to the action of the water pressure plug pipe 5, the hole is divided into an upper section and a lower section, specifically as shown in fig. 7, when the lower section is plugged, the mixed slurry cannot enter the hole of the upper section, and therefore the pertinence and the accuracy of plugging are achieved. By adopting the operation, the plugging technical effect is obvious, and the consumed slurry amount can be minimized. When deep hole construction is needed, when water gushes from the porous section, a section can be constructed and blocked up to a preset depth. The method of the embodiment can meet the requirements of the existing drilling holes with various large depths and various difficult and complicated geological conditions.

Example 4:

based on the embodiment 3, the further optimization is carried out, and as shown in the attached fig. 7, in this embodiment, the fixed joint 15 which is not provided with the water pressure plug pipe 5 in the embodiment 3 is replaced by the movable joint 18 which is fixedly connected with the rubber pipe 16, and the movable joint 18 is connected with the outer side wall of the night soil feeding pipe 14 in a sliding and sealing manner through the mixing pipe.

In order to meet the back-and-forth sliding requirement of the movable structure 18 and better realize the sealing effect, preferably, the inner side wall of the movable joint 18 is provided with a plurality of sealing rings 17 attached to the mixed slurry inlet pipe 14. The mode that sets up sealing washer 17 can be further reduce the surface roughness requirement and the fit tolerance requirement between the movable joint 18 internal diameter and the mixed thick liquid advance thick liquid pipe 14 external diameter for the processing degree of difficulty is lower, and the convenient degree of follow-up maintenance is higher, and the maintenance cost is cheaper, and is convenient. The use of the movable joint 18 enables the pressure increase in the hydraulic plug tube 5 to be significantly reduced for the same fixed effect. Due to the adoption of the movable joint 18, after the rubber tube 16 is pressurized, the rubber tube 16 radially expands and becomes larger, and the axial length is further shortened, so that the deformation of the rubber tube 16 is facilitated, and the problem that the rubber tube 16 cannot be reliably abutted and fastened due to the fact that the hole wall of the rubber tube 16 is loose in geology and can only be caused by radial expansion because the rubber tube 16 cannot be axially shortened is greatly reduced. During the continuous pressurization process, the rubber tube 16 is subjected to a pressure exceeding the expansion limit and bursts. After the fixed joint 15 is replaced by the movable joint 18, the rubber tube 16 with the same material and size can obviously enlarge the effective radial expansion range while shortening the axial length, is more effective in dealing with loose geological conditions, and avoids the problem of explosion due to over-expansion. Meanwhile, after the movable joint 18 is adopted, the requirement on ground supercharging equipment is also obviously reduced, so that the requirement on a pipeline connected with the water pressure plug pipe 5 is also reduced, the investment on material cost is obviously reduced, and the service life is prolonged.

This embodiment is fixed through the hydraulic plug, can fix the blender in appointed depth section position for the pertinence and the accuracy that the water was gushed in two thick liquid shutoff are higher. The mixer adopts near the target area to mix the cement paste and the water glass paste, can solve simultaneously and solidify in advance and lead to stifled pipe and the downthehole inhomogeneous problem of mixing of two thick liquid, the targeted solution is two thick liquid and is poured the industry pain point and the technological difficulty in the shutoff technique. Simultaneously, this application designs unique two thick liquid injection structure and hybrid chamber structure based on venturi principle, can realize the intensive mixing of thick liquid. Moreover, this application has still add multiunit spiral director very much, can realize the mixed action to the thick liquid by many gradients, ensures that the mixed thick liquid of output is even, abundant.

Example 5:

the present embodiment is a technical solution parallel to embodiment 2, and specifically, as shown in fig. 8 and 9, the upper end of the connecting sleeve 9 is provided with a plurality of through holes 10, the lower end of the connecting sleeve is provided with a plurality of annularly arranged slits 19 communicated with any through hole 10, the slits 19 may be concentrically arranged in multiple layers to meet different water glass flow requirements, but any layer of slits 19 is communicated with the through holes 10 and used for discharging water glass slurry to the mixing chamber 12. The design using the slit 19 has advantages over the wire drawing nozzle 11 of embodiment 2: firstly, the cross section area of the end face of the same connecting sleeve 9 can have larger flow, and the limited maximum flow limit caused by the adoption of the wire-drawing nozzle 11 is avoided; secondly, the design of the slit 19 can be in a micron level, so that the backflow of cement paste is prevented, and the problem of coagulation and blockage in the connecting sleeve 9 is solved. When the minimum distance of the slit 19 is smaller than the particle size of cement paste particles, the backflow of the cement paste can be effectively blocked, and the occurrence of pipe blockage is avoided. When the design of the small-spacing slits 19 is adopted, the problem that the flow demand of the water glass slurry cannot be met can be solved by increasing the number of stages of the slits 19 or enlarging the spacing of the slits 19; when the distance between the slits 19 is enlarged to increase the flow rate of the water glass slurry, a spherical one-way valve 20 is required to be arranged at the upper end of the connecting sleeve 9 for performing a non-return function, so that the cement slurry is blocked at the downstream of the connecting sleeve 9, and further pipe blockage is avoided. Of course, as a person skilled in the art, when the dual-fluid slurry mixer of the present embodiment is used, the cement slurry pressurization pipeline must be turned off first, and then the water glass slurry pressurization pipeline must be turned off, so as to further avoid the occurrence of pipe blockage due to backflow mixing caused by the fact that the pressure of the cement slurry conveying pipeline is higher than the pressure of the water glass slurry conveying pipeline. Thus, triple insurance is formed to avoid pipe blockage.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A small-aperture double-slurry mixer is characterized in that: the device comprises an outer shell (1), and a reverse valve (6) fixedly arranged in the outer shell (1) and used for dividing an inner cavity of the outer shell (1) into a first independent and closed channel and a second channel, wherein the reverse valve (6) is provided with a valve core for conducting the first channel in a one-way manner, the tail ends of the first channel and the second channel are communicated through a mixing cavity (12) arranged at the tail part of the outer shell (1), the mixing cavity (12) is provided with an expanded structure, and the axial section of the mixing cavity is gradually converged along the flowing direction of a fluid;

the inlet end of the first channel is connected with a cement slurry inlet pipe (3), and the outlet end of the first channel is close to the mixing cavity (12) and is arranged in a converging manner along the axial section of the fluid flowing direction; the inlet end of the second channel is connected with a water glass slurry inlet pipe (4), the outlet end of the second channel is provided with a wire drawing spray head (11), and the mixing cavity (12) is connected with a mixed slurry outlet pipe.

2. A small bore dual slurry mixer as claimed in claim 1, wherein: the first channel is advanced thick liquid pipe (3), case and intercommunication by the grout that connects gradually the penetrating pipe of hybrid chamber (12) is constituteed, the case include high-pressure spring (8), and with high-pressure spring (8) support to lean on steel ball (7) that the contact is used for preventing the grout backward flow, penetrate the intraduct along grout flow direction gradually converge and with the crossing critical plane of hybrid chamber (12) is minimum cross section.

3. A small bore dual slurry mixer as claimed in claim 2, wherein: and the side wall of the grout injection pipe is provided with a plurality of through holes for absorbing water glass grout.

4. A small bore dual slurry mixer as claimed in claim 2, wherein: the outer shell (1) comprises a first shell section and a second shell section, the first shell section and the second shell section are connected through a detachable and fixedly connected connecting sleeve (9), the connecting sleeve (9) is provided with a plurality of through holes (10) which are communicated with the first shell section and the second shell section, and one end, close to a mixing cavity (12), of any through hole (10) is provided with a wire drawing nozzle (11); the second channel consists of an annular space formed between the inner wall of the first shell section and the outer side wall of the first channel and a plurality of through holes (10); the first channel and the second channel intersect in a mixing chamber (12) arranged in the second housing section.

5. A small bore dual slurry mixer as claimed in claim 4, wherein: and a plurality of groups of spiral deflectors are alternately arranged on the pipe wall of the second shell section at the downstream of the mixing cavity (12) along the flow direction of the fluid, and the guiding directions of two adjacent groups of spiral deflectors are opposite.

6. A small bore dual slurry mixer as claimed in claim 5, wherein: any group of the spiral guider at least consists of three spiral blades which are positioned at the same axial position and are uniformly distributed on the inner wall of the second shell section.

7. A small bore dual slurry mixer according to any one of claims 1 to 6, wherein: the double-slurry mixer is characterized by also comprising a water pressure plug (2) used for fixing the double-slurry mixer, wherein a mixed slurry inlet pipe (14) detachably and fixedly connected with the mixed slurry outlet pipe through a screw connector (13) penetrates through the water pressure plug (2); fixed and relative set up in mix thick liquid advances a pair of fixed joint (15) on thick liquid pipe (14) circumference lateral wall, connect two rubber tube (16) of fixed joint (15) and set up arbitrary be used for the intercommunication on fixed joint (15) rubber tube (16) inner wall and mix thick liquid and advance water pressure cock pipe (5) in the space between thick liquid pipe (14) outer wall.

8. A small bore dual slurry mixer as claimed in claim 7, wherein: and replacing a fixed joint (15) which is not provided with a water pressure plug pipe (5) with a movable joint (18) which is fixedly connected with the rubber pipe (16), wherein the movable joint (18) is connected with the outer side wall of the mixed slurry inlet pipe (14) in a sliding and sealing manner.

9. A small bore dual slurry mixer as claimed in claim 8, wherein: the inner side wall of the movable joint (18) is provided with a plurality of sealing rings (17) which are attached to the mixed slurry inlet pipe (14).

10. A small bore dual slurry mixer as claimed in claim 2, wherein: the outer shell (1) comprises a first shell section and a second shell section, the first shell section and the second shell section are connected through a detachable and fixedly connected connecting sleeve (9), the connecting sleeve (9) is provided with a plurality of through holes (10) which are communicated with the first shell section and the second shell section, and one end, close to the mixing cavity (12), of each through hole (10) is communicated through at least one annular slit (19); the upper end of the through hole (10) is detachably connected with a ball-shaped one-way valve (20) for preventing backflow.

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