Mixed discharging device and mixed discharging system

Abstract

The utility model relates to a mixed discharging device and a mixed discharging system.The mixed discharging device comprises a tank body, a feeding port is formed in one end of the tank body in the axis direction, and a liquid inlet and a discharging port are formed in the side wall of the tank body; the inner bottom wall of the tank body is a slope surface, and the discharge port is positioned on the low-position side of the slope surface; the impeller is rotatably arranged in the tank body, and the impeller is arranged at the feeding hole; wherein the impeller is of a hollow structure and communicates with the feeding port, a plurality of centrifugal through holes are formed in the side wall of the impeller, and the interior of the impeller communicates with the interior of the tank body. The proppant is conveyed into the tank body through the impeller to be mixed with fracturing base fluid, the sand mixing process is short in time, immediate mixing and immediate discharging are achieved, the continuity and timeliness of sand mixing are improved, the requirements for large-displacement and high-sand-ratio mixing are met, and certain discharging pressure can be kept.

Description

Technical Field

[0001] The present application relates to the technical field of petroleum equipment, and in particular to a mixing device and a mixing system. Background Art

[0002] In the oil field, fracturing technology has become the main means of increasing oil and gas well production. During the fracturing operation at the well site, there are operational requirements for large displacement and high sand ratio. In the related technology, the sand mixing equipment is mostly a blade stirring sand mixing tank, which uses blades to stir the fracturing base fluid and proppant at a low speed to mix them. However, the above mixing method has the problems of insufficient mixing, uneven mixing, and easy sand deposition, and is limited by the external size of the mixing equipment, and cannot achieve high displacement. Utility Model Content

[0003] The present application provides a mixing and discharging device and a mixing and discharging system, which make the mixing of fracturing base fluid and proppant more uniform and sufficient, are less likely to cause sand deposition, and can achieve high displacement.

[0004] In the first aspect, the present application provides a mixing and discharge device, comprising: a tank body, one end of which along the axial direction is provided with a feed port, and the side wall of the tank body is provided with a liquid inlet and a discharge port; the inner bottom wall of the tank body is a slope, and the discharge port is located on the low side of the slope; an impeller, rotatably arranged in the tank body, and the impeller is located at the feed port; wherein the impeller is a hollow structure and is connected to the feed port, the side wall of the impeller is provided with a plurality of centrifugal through holes, and the interior of the impeller is connected to the interior of the tank body.

[0005] In a possible implementation, the impeller includes an impeller upper cover, an impeller body and an impeller lower cover, the impeller body is cylindrical, and its internal space is constructed as the hollow structure; the impeller upper cover is connected to the upper side of the impeller body, and the impeller lower cover is connected to the lower side of the impeller body; wherein, the impeller upper cover is provided with a first through hole to connect the feed port; wherein, a plurality of the centrifugal through holes are arranged along the circumferential side wall of the impeller body, and each of the centrifugal through holes is provided with an auxiliary blade, one side of the auxiliary blade is connected to the impeller body, and the other side of the auxiliary blade is bent toward the inner side of the impeller body.

[0006] In a possible implementation, there is a preset ratio between the total axial height of the impeller and the outer diameter of the impeller, and the preset ratio is greater than a threshold value;

[0007] Wherein, the outer diameter of the impeller body is greater than the outer diameter of the impeller upper cover; and / or, the outer diameter of the impeller body is greater than the outer diameter of the impeller lower cover.

[0008] In one possible implementation, the impeller includes a first blade arranged on the impeller upper cover, the first blade is located on a side of the impeller upper cover away from the impeller body; and / or the impeller includes a second blade arranged on the impeller lower cover, the second blade is located on a side of the impeller lower cover away from the impeller body.

[0009] In a possible implementation, it also includes a wear-resistant disc structure, which is arranged between the impeller cover and the inner top wall of the tank body, and the wear-resistant disc structure can move along the axial direction of the tank body to adjust the gap between the wear-resistant disc structure and the impeller.

[0010] In a possible implementation manner, the wear-resistant disc structure is provided with a third through hole, and the third through hole is provided with a convex ring, and the convex ring is inserted into the first through hole.

[0011] In a possible implementation, the tank body includes a feed hopper, a sand mixing shell, a sand mixing upper cover and a sand mixing lower cover, the sand mixing upper cover is buckled on the upper side of the sand mixing shell, and the sand mixing lower cover is buckled on the lower side of the sand mixing shell; wherein the sand mixing shell is cylindrical in shape to construct a sand mixing space, the slope is formed on the sand mixing lower cover, the sand mixing upper cover is provided with a fourth through hole, the feed hopper is installed on the fourth through hole, and the feed port is provided on the feed hopper.

[0012] In a possible implementation, a guide plate is provided on the inner side wall of the sand mixing housing, and the guide plate is spiral-shaped.

[0013] In a possible implementation, it also includes a shaft, and the impeller is rotatably connected to the tank body through the shaft; wherein the shaft includes a shaft body and a support portion, the support portion is installed on the upper side of the tank body or the lower side of the tank body, one end of the shaft body is rotatably connected to the support portion, and the other end of the shaft body extends into the tank body; the impeller is sleeved on the shaft body, and the impeller is spaced apart from the inner bottom wall of the tank body.

[0014] In the second aspect, the present application provides a mixing system, comprising a suction device, a sand adding device, a discharge device and the mixing device as described in the first aspect; the suction device is connected to the liquid inlet of the mixing device, the sand adding device is connected to the feed port of the mixing device, and the discharge device is connected to the discharge port of the mixing device.

[0015] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0016] The sand mixing device and sand mixing system provided in the embodiments of the present application deliver proppant into the tank body through an impeller and mix it with the fracturing base fluid. The sand mixing process takes a short time and can achieve mixing and discharging immediately, thereby improving the continuity and timeliness of sand mixing, meeting the needs of large displacement and high sand ratio mixing, and being able to maintain a certain discharge pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0020] Figure 1 A schematic diagram of the structure of a mixing device provided in an embodiment of the present application;

[0021] Figure 2 A cross-sectional schematic diagram of a mixing device provided in an embodiment of the present application;

[0022] Figure 3 A cross-sectional schematic diagram of a mixing device provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of the shaft member provided in an embodiment of the present application;

[0024] Figure 5 A schematic cross-sectional view of an impeller provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of the structure of an impeller provided in an embodiment of the present application;

[0026] Figure 7 A schematic diagram of the structure of an impeller provided in an embodiment of the present application;

[0027] Figure 8 A schematic diagram of the structure of an impeller provided in an embodiment of the present application;

[0028] Fig. 9 A schematic diagram of the structure of the first blade provided in an embodiment of the present application;

[0029] Fig.10 A schematic diagram of a wear-resistant disc structure provided in an embodiment of the present application;

[0030] Fig.11 A schematic diagram of a wear-resistant disc structure provided in an embodiment of the present application;

[0031] Fig.12 A schematic diagram of a mixed arrangement system provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 1. Mixing and discharging device; 11. Tank body; 111. Feed hopper; 1111. Feed inlet; 112. Sand mixing shell; 1121. Sand mixing space; 1122. Liquid inlet; 1123. Discharging outlet; 113. Sand mixing upper cover; 1131. Fourth through hole; 114. Sand mixing lower cover; 1141. Slope; 115. Guide plate; 12. Impeller; 121. Impeller upper cover; 1211. First through hole; 122. Impeller body; 1221. Centrifugal through hole; 12 22. Auxiliary blade; 123. Impeller lower cover; 1231. Shaft hole; 124. First blade; 125. Second blade; 13. Shaft member; 131. Shaft body; 132. Supporting part; 1321. Bearing; 1322. Supporting frame; 14. Wear-resistant disc structure; 141. Wear-resistant disc body; 1411. Third through hole; 1412. Convex ring; 142. Push bolt; 143. First limiting nut; 144. Tightening bolt; 145. Second limiting nut;

[0034] 2. Suction device; 21. Centrifugal pump; 22. First pipeline; 23. First flow meter; 24. First valve; 3. Sand adding device; 31. Sand bucket; 32. Sand conveying auger; 4. Discharge device; 41. Second flow meter; 42. Second valve; 43. Second pipeline. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0036] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0037] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0038] In order to solve the technical problems in the related art such as insufficient and uneven mixing, easy sand sedimentation, and inability to achieve high displacement, the present application provides a sand mixing device, which transports the proppant to the sand mixing space through an impeller and mixes it with the fracturing base fluid. The sand mixing process is short and mixing and discharging can be achieved immediately, thereby improving the continuity and timeliness of sand mixing, meeting the needs of large displacement and high sand ratio mixing, and being able to maintain a certain discharge pressure.

[0039] In some exemplary embodiments, Figure 1 , Figure 2 As shown, a mixing device 1 is used to mix the fracturing base fluid and the proppant, wherein the mixing device 1 comprises a tank body 11 and an impeller 12 .

[0040] The tank body 11 is placed in a vertical direction, that is, its axis extends in a vertical direction. The interior of the tank body 11 is a hollow structure, for example, it can serve as a sand mixing space 1121 to provide space for mixing the fracturing base fluid and the proppant.

[0041] Among them, the interior of the tank body 11 is a hollow structure, having an inner top wall, an inner bottom wall, an inner side wall, etc. In this application, the sand mixing space 1121 is described as an example, and the inner top wall, inner bottom wall, inner side wall, etc. of the sand mixing space 1121 correspond to the inner top wall, inner bottom wall, inner side wall, etc. of the tank body 11.

[0042] The tank body 11 is provided with a feed port 1111 at one end along the axial direction. The feed port 1111 is provided at the upper end of the tank body 11, for example, and is connected to the sand mixing space 1121. The feed port 1111 is used to place proppant. The side wall of the tank body 11 is provided with a liquid inlet 1122 and a discharge port 1123. The liquid inlet 1122 and the discharge port 1123 are provided along its tangent direction, for example. The liquid inlet 1122 is used to place fracturing base fluid, and the discharge port 1123 is used to discharge sand-containing fracturing fluid. The tank body 11 provides a circulation channel for the fracturing base fluid. At the same time, the fracturing base fluid and the proppant can be mixed in the annular space between the inner wall of the sand mixing space 1121 and the outer diameter of the impeller 12.

[0043] The inner bottom wall of the sand mixing space 1121 is a slope 1141, and the discharge port 1123 is located at the lower side of the slope 1141. The discharge port 1123 can be set at the lowest point of the slope 1141, so that the sand-containing fracturing fluid can be discharged from the discharge port 1123 to prevent sand from accumulating at the bottom of the inner bottom wall of the sand mixing space 1121. Of course, it can be understood that the discharge port 1123 is set at the lower end of the tank body 11 (refer to Figure 3 As shown), that is, the opposite side of the feed port 1111 along the axial direction can also facilitate the discharge of the sand-containing fracturing fluid and prevent sand accumulation, which is subject to actual conditions.

[0044] In this embodiment, if Figure 1 , Figure 2 As shown, the impeller 12 is rotatably connected to the tank body 11 and is located in the sand mixing space 1121 to mix and stir the fracturing base fluid and the proppant. The impeller 12 covers the feed port 1111. The impeller 12 is a hollow structure, and its internal cavity is connected to the feed port 1111 to receive the proppant. The side wall of the impeller 12 is provided with a plurality of centrifugal through holes 1221. The interior of the impeller 12 is connected to the sand mixing space 1121, so that the proppant in the hollow structure can flow into the sand mixing space 1121 and mix with the fracturing base fluid.

[0045] The impeller 12 may be rotatably connected to the tank body 11 via a shaft 13 , for example. The shaft 13 may include a shaft body 131 and a support portion 132 , and the support portion 132 may include a bearing 1321 and a support frame 1322 .

[0046] Some examples include Figure 1 , Figure 2As shown, the support part 132 is installed on the upper side of the tank body 11, for example, the lower end of the support frame 1322 is connected to the feed port 1111, and the upper end of the support frame 1322 is installed with a bearing 1321 to provide support therefor. Among them, a gap is set at the lower end of the support frame 1322 to avoid part of the feed port 1111 to ensure the normal placement of the proppant.

[0047] One end of the shaft 131 is rotatably connected to the bearing 1321 of the support 132, and the shaft 131 can pass through the bearing 1321 to facilitate connection with an external power mechanism. The power mechanism is, for example, a drive motor, a hydraulic motor, etc. The drive motor is, for example, a variable frequency motor, which is used to adjust the speed of the impeller 12 to meet the needs of different displacements.

[0048] The other end of the shaft 131 passes through the feed port 1111 and enters the sand mixing space 1121. The impeller 12 is sleeved on the shaft 131, and the shaft 131 can drive the impeller 12 to rotate at high speed. Among them, there is a certain distance between the other end of the shaft 131 and the inner bottom wall of the sand mixing space 1121, realizing a cantilever structure, so that the impeller 12 and the inner bottom wall of the sand mixing space 1121 are spaced apart. The impeller 12 and the shaft 131 together constitute a rotor system, and a gap is left between the rotor system and the inner bottom wall of the sand mixing space 1121, and no connection structure is provided, effectively avoiding a complex shaft system. In addition, the bottom of the tank body 11 does not need to be sealed, which simplifies the repair and maintenance process and improves reliability.

[0049] In other examples, such as Figure 1 , Figure 4 As shown, the support part 132 is installed at the lower side of the tank body 11, the support frame 1322 is inverted, and its lower end is connected to the bottom wall of the tank body 11, and the bearing 1321 is installed on the support frame 1322. One end of the shaft body 131 is rotatably connected to the bearing 1321 of the support part 132, and the shaft body 131 can pass through the bearing 1321 to facilitate connection with an external drive motor, thereby realizing a bottom-driven structure.

[0050] The other end of the shaft 131 can rotatably pass through the bottom of the tank 11 and extend into the sand mixing space 1121. The bearing 1321 provides support for the rotor system composed of the shaft 131 and the impeller 12. The impeller 12 is sleeved on the shaft 131, and the impeller 12 and the inner bottom wall of the sand mixing space 1121 are spaced or fitted, depending on the actual situation. The connection between the shaft 131 and the bottom of the tank 11 needs to be sealed to prevent leakage.

[0051] In some exemplary embodiments, Figure 5-Figure 7 As shown, the impeller 12 includes an impeller upper cover 121, an impeller body 122 and an impeller lower cover 123. The impeller body 122 is cylindrical, and its internal space is constructed as a hollow structure to accommodate the proppant.

[0052] The impeller upper cover 121 is connected to the upper side of the impeller body 122 to close the upper end of the impeller body 122. The impeller upper cover 121 is provided with a first through hole 1211, which is arranged corresponding to the feed port 1111. The diameter of the first through hole 1211 is larger than the diameter of the shaft 131, which ensures that the shaft 131 can pass through the first through hole 1211 and that the proppant in the feed port 1111 can enter the hollow structure of the impeller 12 through the first through hole 1211.

[0053] The impeller lower cover 123 is connected to the lower side of the impeller body 122 to close the lower end of the impeller body 122. The impeller lower cover 123 may be provided with a shaft hole 1231, into which the other end of the shaft body 131 is inserted, to improve the reliability of the connection between the impeller 12 and the shaft body 131.

[0054] In the related art, the sand mixing equipment generally adopts a closed sand mixing pump, and its impeller adopts a sand dividing impeller or a sand dividing blade, which increases the complexity of the structure. The impeller 12 in the present application does not need to be provided with a sand dividing impeller or a sand dividing blade, which effectively avoids the complex structural design, simplifies the production process of the product, provides more abundant sand discharging space, and ensures the sand discharging performance of the impeller. And because the impeller 12 has a large height-to-diameter ratio, the sand discharging performance can be guaranteed and the accumulation of the central structure can be avoided.

[0055] Among them, the centrifugal through hole 1221 is arranged on the circumferential side wall of the impeller body 122, and multiple centrifugal through holes 1221 can be evenly arranged in sequence around the circumferential side wall of the impeller body 122. Each centrifugal through hole 1221 is provided with an auxiliary blade 1222, one side of the auxiliary blade 1222 is connected to the impeller body 122, and the other side of the auxiliary blade 1222 is bent toward the inner side of the impeller body 122.

[0056] The side wall of the impeller body 122 and the auxiliary blades 1222 together constitute stirring blades, which can drive the proppant into the fracturing base fluid in the sand mixing space 1121 at high speed under the action of centrifugal force to achieve rapid mixing. In addition, the impeller body 122, under the action of centrifugal force, promotes the flow of materials from the center to the outside, which can effectively isolate the fracturing base fluid in the sand mixing space 1121, prevent the fracturing base fluid from flowing back into the hollow structure of the impeller body 122, and prevent it from escaping from the feed port 1111.

[0057] It should be noted that, in addition to the above-mentioned arrangement of the impeller body 122, the stirring blades formed by the side wall of the impeller body 122 and the auxiliary blades 1222 may also adopt different blade types, such as Figure 8As shown, for example, long and short blades or a backflow prevention structure are provided, similar to a closed pump impeller structure, to improve the sealing ability of the impeller 12, taking into account the effects of increasing liquid pressure and mixing solid and liquid.

[0058] The impeller 12 may be made of wear-resistant castings, or a wear-resistant coating may be added to the surface of the impeller 12. The wear-resistant coating may be amorphous metal ceramics, high molecular polymers, etc., thereby increasing the wear resistance of the impeller 12 and prolonging the service life of the impeller.

[0059] In this embodiment, if Figure 2 , Figure 5 As shown, there is a preset ratio between the total axial height h and the outer diameter d of the impeller 12, and the preset ratio is greater than a threshold value, such as 0.5, that is, the height-to-diameter ratio is greater than 0.5. Setting the height-to-diameter ratio can ensure the contact area between the impeller 12 and the proppant and the fracturing base fluid, which is beneficial to improving the sand mixing efficiency and ensuring the uniformity during sand mixing. At the same time, a larger height-to-diameter ratio can ensure that the proppant can flow from the hollow structure of the impeller 12 to the edge of the impeller 12 and enter the sand mixing space 1121 of the tank body 11, avoiding the problem of proppant accumulation in the hollow structure of the impeller 12.

[0060] In this embodiment, if Figure 5-Figure 7 As shown, the impeller 12 adopts a backward centrifugal structure, and the outer diameter of the impeller body 122 is larger than the outer diameter of the impeller cover 121, which is conducive to driving the fluid to rotate and discharge.

[0061] Of course, it is understandable that the outer diameter of the impeller body 122 is not limited to being larger than the outer diameter of the impeller upper cover 121. The outer diameter of the impeller body 122 may also be larger than the outer diameter of the impeller lower cover 123, which is also conducive to driving the fluid to rotate and discharge. The specific situation shall prevail.

[0062] In this embodiment, if Figure 5-Figure 7 As shown, the impeller 12 includes a first blade 124 disposed on the impeller upper cover 121, and the first blade 124 is located on a side of the impeller upper cover 121 away from the impeller body 122. The first blade 124 rotates with the impeller body 122 to generate centrifugal force to prevent liquid from flowing into the feed port 1111 from the gap between the first blade 124 and the top wall of the sand mixing space 1121, and then overflowing to the outside.

[0063] Reference Figure 5-Figure 7 , Fig. 9 As shown, from left to right, the first blade 124 can be, for example, a straight blade type, an arc blade type, a labyrinth blade type, or a sickle blade type. By controlling the type of the first blade 124 and the gap between the first blade 124 and the sand mixing space 1121, the medium is sealed to prevent the pressurized fluid in the tank body 11 from overflowing from the feed port 1111.

[0064] Of course, it is understandable that blades can also be provided on the lower side of the impeller lower cover 123 to achieve the corresponding purpose. For example, the impeller 12 includes a second blade 125 provided on the impeller lower cover 123, and the second blade 125 is located on the side of the impeller lower cover 123 away from the impeller body 122. The second blade 125 can change the fluid pressure distribution at the impeller lower cover 123, reduce the axial force, and further balance part of the axial force. At the same time, the second blade 125 is located on the lower side of the sand mixing space 1121, and can stir the fluid at the bottom of the sand mixing space 1121 to prevent sand accumulation at the bottom of the sand mixing space 1121.

[0065] The second blade 125 may be a backward curved structure. Alternatively, to ensure a higher discharge pressure, the second blade 125 may be a forward curved blade or a radial blade, etc., depending on the actual situation.

[0066] In some exemplary embodiments, Fig.10 As shown, the mixing device 1 also includes a wear-resistant disc structure 14, which is arranged between the impeller upper cover 121 and the inner top wall of the sand mixing space 1121. The wear-resistant disc structure 14 can move along the axial direction of the tank body 11 to adjust the gap between the wear-resistant disc structure 14 and the impeller 12 to ensure a good non-contact sealing effect.

[0067] Some examples include Fig.10 , Fig.11 As shown, the wear-resistant disc structure 14 includes a wear-resistant disc body 141, a push bolt 142, a first limiting nut 143, a tension bolt 144 and a second limiting nut 145. The wear-resistant disc body 141 is, for example, an annular disc, and is sandwiched between the impeller cover 121 and the inner top wall of the sand mixing space 1121. The upper part of the wear-resistant disc body 141 is the sand mixing cover 113, that is, the lower surface of the sand mixing cover 113 is the inner top wall of the sand mixing space 1121, which will be described in detail later.

[0068] The connecting end of the pushing bolt 142 passes through the first limiting nut 143 and is screwed to the sand mixing cover 113, wherein the connecting end of the pushing bolt 142 passes through the sand mixing cover 113 and abuts against the wear-resistant disc body 141. Rotating the free end of the pushing bolt 142 can push the wear-resistant disc body 141 toward the impeller cover 121, thereby changing the gap between the wear-resistant disc body 141 and the impeller cover 121, thereby ensuring a good non-contact sealing effect.

[0069] The connecting end of the tension bolt 144 passes through the second limiting nut 145 and the sand mixing cover 113 in sequence, and is screwed to the wear-resistant disc body 141. When the free end of the tension bolt 144 is rotated, the wear-resistant disc body 141 can be lifted, so that the wear-resistant disc body 141 moves toward the sand mixing cover 113, changing the gap between the wear-resistant disc body 141 and the sand mixing cover 113 or the wear-resistant disc body 141 and the impeller cover 121, ensuring a good non-contact sealing effect.

[0070] In this embodiment, if Fig.10 As shown, the wear-resistant disc structure 14 is provided with a third through hole 1411, which is the center of the wear-resistant disc body 141. The third through hole 1411 is provided with a convex ring 1412, which is inserted into the first through hole 1211. A sealing ring structure, i.e., a convex ring 1412, is provided at the inner diameter of the wear-resistant disc body 141 and the inner diameter of the impeller upper cover 121 to form a labyrinth seal, further improving the sealing ability.

[0071] In some exemplary embodiments, Figure 1 , Figure 2 As shown, the tank body 11 includes a feed hopper 111, a sand mixing shell 112, a sand mixing upper cover 113 and a sand mixing lower cover 114, wherein the sand mixing shell 112 is cylindrical, and the sand mixing upper cover 113 is buckled on the upper side of the sand mixing shell 112 to close the upper end of the sand mixing shell 112. The sand mixing lower cover 114 is buckled on the lower side of the sand mixing shell 112 to close the lower end of the sand mixing shell 112.

[0072] The sand mixing housing 112 is a hollow structure, and its interior is constructed as a sand mixing space 1121. The slope 1141 is formed on the sand mixing lower cover 114, and the sand mixing upper cover 113 is provided with a fourth through hole 1131, which is convenient for the shaft 13 to pass through. The feed hopper 111 is installed in the fourth through hole 1131 to make it connected, so as to ensure that the fracturing base fluid can enter the sand mixing space 1121. Among them, the feed port 1111 is provided in the feed hopper 111.

[0073] In some examples, the feed hopper 111 adopts a funnel-shaped structure, and the enclosed area is the feed port 1111. The inner surface of the feed hopper 111 may be coated with a hydrophobic material, for example, to prevent water and proppant from adhering to the surface of the feed hopper 111 and affecting the sand.

[0074] In this embodiment, if Figure 1 , Figure 2 As shown, the inner wall of the sand mixing housing 112 is provided with a guide plate 115, which is spirally shaped and arranged from top to bottom around the inner wall of the sand mixing housing 112 to guide the fluid from the liquid inlet 1122 to the discharge port 1123 to reduce flow loss. The liquid inlet 1122 and the discharge port 1123 are both arranged on the side wall of the sand mixing housing 112.

[0075] The mixing and discharging device proposed in the present application adopts a centrifugal impeller for mixing. The sand mixing process is short in time, and mixing and discharging can be achieved immediately, thereby improving the continuity and timeliness of sand mixing, meeting the needs of large displacement and high sand ratio mixing, and being able to maintain a certain discharge pressure.

[0076] At the same time, automatic control can be easily achieved through speed regulation, which can meet the requirements of different displacements. The structure of the mixed displacement device is relatively compact, which can realize the arrangement of two tanks per vehicle, further increasing the displacement of the vehicle. The setting of the wear-resistant disc structure can improve the wear resistance and increase the service life.

[0077] The present application also provides a mixed arrangement system, such as Figure 1 , Figure 2 , Fig.12 As shown, it includes a suction device 2, a sand adding device 3, a discharge device 4 and a mixing device 1 as in any of the above embodiments.

[0078] The suction device 2 is connected to the liquid inlet 1122 of the mixing device 1, and the sand adding device 3 is connected to the feed port 1111 of the mixing device 1. The proppant flows into the sand mixing space 1121 through the sand adding device 3 and the feed hopper 111 and is mixed with the fracturing base fluid. The discharge device 4 is connected to the discharge port 1123 of the mixing device 1.

[0079] The suction device 2 comprises a suction centrifugal pump 21 , a first pipeline 22 , a first flow meter 23 and a first valve 24 , and is used to pump the fracturing base fluid into the mixing device 1 through the suction centrifugal pump 21 .

[0080] The sand adding device 3 comprises a sand hopper 31 and a sand conveying auger 32 , and is used for conveying the proppant into the mixing device 1 .

[0081] The mixing device 1 is used to mix the fracturing base fluid delivered by the suction centrifugal pump 21 with the proppant delivered by the sand conveying auger 32, and the fluid pressure in the tank 11 can be maintained during the mixing process. Therefore, the discharge device 4 does not need to be equipped with a centrifugal pump.

[0082] The discharge device 4 comprises a second flow meter 41, a second valve 42 and a second pipeline 43. There is no need to provide a discharge centrifugal pump, which simplifies the structure of the entire sand mixing system and improves the overall reliability of the system.

[0083] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0084] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0085] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A mixed arrangement device, characterized in that: include: The tank body has a feed port at one end along the axial direction, and a liquid inlet and a discharge port are arranged on the side wall of the tank body; the inner bottom wall of the tank body is a slope, and the discharge port is located on the lower side of the slope; An impeller is rotatably disposed in the tank body, and the impeller is located at the feed port; wherein the impeller is a hollow structure and is connected to the feed port, a plurality of centrifugal through holes are disposed on the side wall of the impeller, and the interior of the impeller is connected to the interior of the tank body.

2. The mixing device according to claim 1, characterized in that: The impeller comprises an impeller upper cover, an impeller body and an impeller lower cover, the impeller body is cylindrical, and its internal space is constructed as the hollow structure; The impeller upper cover is connected to the upper side of the impeller body, and the impeller lower cover is connected to the lower side of the impeller body; wherein the impeller upper cover is provided with a first through hole to communicate with the feed port; Among them, multiple centrifugal through holes are arranged along the circumferential side wall of the impeller body, and each centrifugal through hole is provided with an auxiliary blade, one side of the auxiliary blade is connected to the impeller body, and the other side of the auxiliary blade is bent toward the inner side of the impeller body.

3. The mixing device according to claim 2, characterized in that: There is a preset ratio between the total axial height of the impeller and the outer diameter of the impeller, and the preset ratio is greater than a threshold value; Wherein, the outer diameter of the impeller body is greater than the outer diameter of the impeller upper cover; and / or, the outer diameter of the impeller body is greater than the outer diameter of the impeller lower cover.

4. The mixing device according to claim 2, characterized in that: The impeller comprises a first blade arranged on the impeller upper cover, wherein the first blade is located on a side of the impeller upper cover away from the impeller body; and / or, The impeller comprises a second blade arranged on the impeller lower cover, and the second blade is located on a side of the impeller lower cover away from the impeller body.

5. The mixed arrangement device according to claim 2, characterized in that: It also includes a wear-resistant disc structure, which is arranged between the impeller upper cover and the inner top wall of the tank body. The wear-resistant disc structure can move along the axial direction of the tank body to adjust the gap between the wear-resistant disc structure and the impeller.

6. The mixed arrangement device according to claim 5, characterized in that: The wear-resistant disc structure is provided with a third through hole, and the third through hole is provided with a convex ring, and the convex ring is inserted into the first through hole.

7. The mixed arrangement device according to claim 1, characterized in that: The tank body comprises a feed hopper, a sand mixing shell, a sand mixing upper cover and a sand mixing lower cover, wherein the sand mixing upper cover is buckled on the upper side of the sand mixing shell, and the sand mixing lower cover is buckled on the lower side of the sand mixing shell; Among them, the sand mixing shell is in a cylindrical shape to construct a sand mixing space, the slope is formed on the sand mixing lower cover, the sand mixing upper cover is provided with a fourth through hole, the feed hopper is installed on the fourth through hole, and the feed port is provided on the feed hopper.

8. The mixed arrangement device according to claim 7, characterized in that: The inner side wall of the sand mixing shell is provided with a guide plate, and the guide plate is spiral-shaped.

9. The mixing device according to claim 1, characterized in that: It also includes a shaft, through which the impeller is rotatably connected to the tank body; Wherein, the shaft member includes a shaft body and a support portion, the support portion is installed on the upper side of the tank body or the lower side of the tank body, one end of the shaft body is rotatably connected to the support portion, and the other end of the shaft body extends into the tank body; The impeller is sleeved on the shaft body, and the impeller is spaced apart from the inner bottom wall of the tank body.

10. A mixed arrangement system, characterized in that: It comprises a suction device, a sand adding device, a discharge device and a mixing device as claimed in any one of claims 1 to 9; The suction device is connected to the liquid inlet of the mixing device, the sand adding device is connected to the material feed port of the mixing device, and the discharge device is connected to the material discharge port of the mixing device.

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