Filtering device, valve and fracturing fluid tank

Abstract

The invention relates to the field of petroleum industry fracturing operation, and discloses a filtering device, a valve and a fracturing fluid tank. The filter device comprises a filter cartridge, a cleaning assembly and a storage assembly, wherein a filter screen is arranged in the filter cartridge; the cleaning assembly comprises a detection part, a cleaning part and a loosening part which are arranged in the filter cartridge, the detection part is used for detecting the pressure of fluid flowing through the filter cartridge, and the cleaning part cleans the filter screen when it is detected that the pressure of the fluid flowing through the filter cartridge is larger than first preset pressure; when it is detected that the pressure of the fluid flowing through the filter cartridge is larger than second preset pressure, the loosening piece acts on the filter screen so that impurities blocked on the filter screen can be loosened; the storage assembly comprises a storage box arranged at the bottom of the filter cartridge, and the storage box is used for receiving impurities cleaned by the cleaning part. Based on the filtering device provided by the invention, the phenomenon that the liquid supply channel is blocked due to impurity accumulation can be avoided, and the fluid conveying effect is ensured.

Description

Technical Field

[0001] The invention relates to the field of fracturing operations in the petroleum industry, and in particular to a filtering device, a valve and a fracturing fluid tank. Background Art

[0002] In the current production and development of oil and gas fields, fracturing is a common measure to increase oil and gas production. Its main purpose is to inject high-pressure fracturing fluid into the well to create or expand cracks in the oil layer, so as to increase the fluidity of oil and gas and improve the production of the well. During the fracturing operation, large fracturing fluid tanks are often used to meet the fluid supply of the sand mixer. The fracturing fluid tank is usually equipped with a butterfly valve to open and close the tank filling port on a daily basis. During the preparation of water-based guar fracturing fluid, due to uneven stirring, too fast precipitation and other reasons, the prepared liquid often contains gel-like impurities. After these impurities enter the sand mixer through the sand mixer supply pipeline, they will affect the mixing effect of the fracturing fluid and the proppant. After the sand mixer is pumped into the formation, it will affect the fracturing effect.

[0003] In the prior art, usually only horizontally and vertically staggered wire meshes are placed at the joint of the liquid supply hose line of the sand mixer to achieve the effect of blocking the colloidal impurities. However, when there are many colloidal impurities, the liquid supply channel will be blocked, which seriously affects the liquid supply effect. Summary of the invention

[0004] In order to solve the above technical problem or at least partially solve the above technical problem, the present invention provides a filtering device, a valve and a fracturing fluid tank.

[0005] The present invention provides a filtering device, comprising:

[0006] A filter cartridge having a filter screen inside;

[0007] a cleaning assembly, comprising a detection member, a cleaning member and a loosening member arranged in the filter cartridge, wherein the detection member is used to detect the pressure of the fluid flowing through the filter cartridge and is configured such that: when it is detected that the pressure of the fluid flowing through the filter cartridge is greater than a first preset pressure, the cleaning member cleans the filter screen, and when it is detected that the pressure of the fluid flowing through the filter cartridge is greater than a second preset pressure, the loosening member acts on the filter screen to loosen impurities blocking the filter screen; and

[0008] The storage assembly comprises a storage box arranged at the bottom of the filter cartridge, and the storage box is used to receive the impurities cleaned by the cleaning member.

[0009] Optionally, the cleaning member includes a scraper disposed in the filter cylinder and a first driving member for driving the scraper to reciprocate along a vertical direction, and the scraper can scrape impurities on the filter screen during the vertical movement.

[0010] Optionally, the scraper includes a fixing rod connected to the driving end of the first driving member and a scraper body arranged at the bottom of the fixing rod, and two corresponding sides of the scraper body along the horizontal direction are arc-shaped.

[0011] Optionally, the detection component includes a pressure sensor arranged on the filter cartridge, the pressure sensor is provided with a detection probe, and the detection probe is located at the liquid inlet side of the filter screen.

[0012] Optionally, one side of the scraper body facing the liquid inlet end of the filter cartridge protrudes from the fixing rod, and a receiving cavity for receiving the detection probe is formed between the protruding portion of the scraper body and the fixing rod.

[0013] Optionally, the loosening member includes a plurality of elastic struts extending along the vertical direction, the elastic struts are bent and extended, the filter screen is connected to the filter cylinder through the plurality of elastic struts, and as the elastic struts are bent and extended, the filter cylinder is provided with a second driving member for driving the plurality of elastic struts to stretch or reset.

[0014] Optionally, the second driving member includes a driving motor and a plurality of pull ropes, a reel is provided at the output end of the driving motor, the bottom ends of the plurality of pull ropes are respectively connected to the top ends of a plurality of the elastic support rods, and the top ends of the plurality of pull ropes are wound around the reel.

[0015] Optionally, a plurality of guide wheels are provided on the filter cartridge, the guide wheels are vertically opposite to the top ends of the plurality of elastic support rods, and the plurality of pull ropes pass around the corresponding guide wheels.

[0016] Optionally, the elastic support rod is made of shape memory alloy, shape memory polymer, graphene or carbon fiber composite material.

[0017] Optionally, a rotating plate is provided at the entrance of the storage box, and the rotating plate can be flipped downward by force and reset after the force disappears.

[0018] Optionally, the storage box protrudes toward the liquid inlet end of the filter cartridge.

[0019] Optionally, the cross-section of the filter cartridge is circular or rectangular.

[0020] Optionally, flange joints are respectively provided at both ends of the filter cartridge.

[0021] The present invention further provides a valve, comprising a valve body and the above-mentioned filtering device arranged on the valve body.

[0022] The present invention also provides a fracturing fluid tank, comprising a tank body and the above-mentioned valve arranged at the liquid outlet end of the tank body.

[0023] The technical solution provided by the embodiment of the present invention has the following advantages compared with the prior art:

[0024] Based on the filter device provided by the present invention, impurities in the fluid can be filtered through the filter screen, and when the filter screen is blocked, the pressure of the liquid inlet of the filter cartridge will increase, and when the detection component detects that the pressure of the fluid flowing through the filter cartridge is greater than the first preset pressure, the cleaning component cleans the filter screen to avoid clogging of the filter screen, and when the filter screen is seriously clogged and the cleaning component cannot clean the impurities on the filter screen, the clogging will be aggravated, and the pressure of the fluid flowing through the filter cartridge continues to increase. When the detection component detects that the pressure of the fluid flowing through the filter cartridge is greater than the second preset pressure, the loosening component group is used for the filter screen to loosen the impurities on the filter screen, and then the impurities on the filter screen can be removed by the filter assembly, and the impurities are collected by the storage box to avoid the phenomenon of impurity accumulation leading to clogging of the liquid supply channel, thereby ensuring the fluid delivery effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] 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.

[0026] In order to more clearly illustrate the implementation mode of the present invention or the technical solution in the prior art, the drawings required for use in the implementation mode 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 work.

[0027] Figure 1 This is a schematic diagram of the structure of the filtering device according to an embodiment of the present invention;

[0028] Figure 2 It is a cross-sectional view of the filtering device described in the embodiment of the present invention.

[0029] Description of Reference Numerals

[0030] 1. Filter cartridge; 11. Filter screen; 12. Flange joint; 2. Cleaning assembly; 21. Detection piece; 211. Detection probe; 22. Cleaning piece; 221. Scraper; 2211. Fixing rod; 2212. Scraper body; 2213. Accommodating chamber; 23. Loose piece; 231. Elastic support rod; 232. Pull rope; 233. Reel; 3. Storage assembly; 31. Storage box; 311. Turn plate; 4. Integrated box. DETAILED DESCRIPTION

[0031] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0032] The following description sets forth many specific details to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; obviously, the implementation methods in the specification are only part of the implementation methods of the present invention, rather than all of the implementation methods.

[0033] Combination Figure 1 and Figure 2 As shown, the filtering device provided in the embodiment of the present invention includes a filter cartridge 1, a cleaning component 2 and a storage component 3.

[0034] A filter screen 11 is provided inside the filter cartridge 1. The filter cartridge 1 is a metal ring to increase its service life. The filter screen 11 may be perpendicular to the axis of the filter cartridge 1, or there may be a certain angle between the filter screen 11 and the axis of the filter cartridge 1, and it may be designed according to actual needs. In addition, in order to ensure the filtering effect, the filter screen 11 should cover the cross section of the filter cartridge 1 as much as possible. It is understandable that in some cases, when the position or state of the filter screen 11 needs to be changed, additional space needs to be left to avoid the position change or state change of the filter screen 11. The edge of the filter screen 11 may also form a certain gap with the inner wall of the filter cartridge 1, which may be selected according to actual needs.

[0035] The cleaning assembly 2 includes a detection member 21, a cleaning member 22 and a loosening member 23 arranged in the filter cartridge 1. The detection member 21 is used to detect the pressure of the fluid flowing through the filter cartridge 1. In the use state, the filter cartridge 1 can be installed between the liquid outlet and the liquid outlet pipe. At this time, after the filter screen 11 intercepts impurities, the impurities will accumulate on the side of the filter screen 11 facing the liquid inlet end of the filter cartridge 1. As the impurities accumulate, the pressure on the liquid inlet side of the filter screen 11 will gradually increase. At this time, when the detection member 21 detects that the pressure of the fluid flowing through the filter cartridge 1 is greater than the first preset pressure, it proves that there are too many impurities accumulated on the filter screen 11, and the cleaning member 22 cleans the filter screen 11 to ensure the cleaning effect of the cleaning member 22. When it is detected that the pressure of the fluid flowing through the filter cartridge 1 is greater than the second preset pressure, it proves that the impurities accumulated on the filter screen 11 are closely attached to the filter screen, and the cleaning member 22 alone cannot remove the impurities on the filter screen 11. At this time, the loosening member 23 acts on the filter screen 11 to loosen the impurities blocked on the filter screen 11, and at the same time, the loose impurities can be cleaned with the cleaning member 22 to ensure the filtering effect of the filter screen 11. It can be understood that the second preset pressure is greater than the first preset pressure.

[0036] The storage assembly 3 includes a storage box 31 arranged at the bottom of the filter cartridge 1, and the storage box 31 is used to receive impurities cleaned by the cleaning member 22, wherein the storage box 31 has a storage groove, and an inlet is provided at the top of the storage groove, and the inlet is opposite to the filter screen 11 in the vertical direction, so that the cleaned impurities can be collected by the storage box 31, and it is prevented that the impurities continue to stay in the filter cartridge 1 after leaving the filter screen 11, resulting in continued clogging of the filter screen 11, and the storage box 31 can be cleaned regularly to ensure the use effect of the filtering device.

[0037] Based on the filtering device provided by the present invention, impurities in the fluid can be filtered through the filter screen 11, and when the filter screen 11 is blocked, the pressure of the liquid inlet of the filter cartridge 1 will increase, and when the detection member 21 detects that the pressure of the fluid flowing through the filter cartridge 1 is greater than the first preset pressure, the cleaning member 22 cleans the filter screen 11 to avoid the blockage of the filter screen 11, and when the filter screen 11 is seriously blocked and the cleaning member 22 cannot clean the impurities on the filter screen 11, the blockage will be aggravated, and the pressure of the fluid flowing through the filter cartridge 1 continues to increase. When the detection member 21 detects that the pressure of the fluid flowing through the filter cartridge 1 is greater than the second preset pressure, the loosening member 23 group is used for the filter screen 11 to loosen the impurities on the filter screen 11, and then the impurities on the filter screen 11 can be removed by the filter assembly, and the impurities are collected by the storage box 31 to avoid the phenomenon of impurity accumulation leading to blockage of the liquid supply channel, thereby ensuring the fluid delivery effect.

[0038] In some embodiments, in combination Figure 1 and Figure 2 As shown, the cleaning member 22 includes a scraper 221 disposed in the filter cartridge 1 and a first driving member for driving the scraper 221 to reciprocate along the vertical direction. The scraper 221 can scrape impurities on the filter screen 11 during the vertical movement.

[0039] Specifically, the scraper 221 is located on one side of the liquid inlet end of the filter screen 11, and the scraper 221 is vertically opposite to one side of the liquid inlet end of the filter screen 11, so that when the first driving member drives the scraper 221 to move along the vertical direction, the scraper 221 can scrape the liquid inlet end of the filter screen 11, thereby scraping off impurities on the filter screen 11, and can push the impurities through the opening of the storage box 31 and fall into the storage box 31.

[0040] The cleaning member 22 of this design has a simple structure and is easy to operate, and can scrape the filter screen 11 back and forth to increase the cleaning effect of impurities.

[0041] In some embodiments, a clearance opening is provided at the top of the inner wall of the filter cartridge 1, and the scraper 221 is located in the clearance opening, so that the filter screen 11 can occupy the entire interface of the filter cartridge 1, ensuring the filtering effect of impurities and the fluid circulation effect of the filter cartridge 1. An integrated box 4 is provided at the top of the filter cartridge 1, and the first driving member includes an electric push rod arranged in the integrated box 4, and the telescopic rod of the electric push rod extends vertically downward, and the telescopic rod of the electric push rod extends downward into the filter cartridge 1 and is connected to the scraper 221, so that the scraper 221 can be driven to move in the vertical direction through the telescopic rod. In order to avoid fluid leakage, a sealing member is provided at the connection position between the telescopic rod and the filter cartridge 1, and the sealing member can be a sealing ring or other sealing materials, etc., to ensure the sealing of the filtering device.

[0042] In some embodiments, the scraper 221 includes a fixed rod 2211 connected to the driving end of the first driving member and a scraper body 2212 disposed at the bottom of the fixed rod 2211, and the two corresponding sides of the scraper body 2212 along the horizontal direction are arc-shaped. Among them, the top end of the fixed rod 2211 is connected to the bottom end of the telescopic rod, so that the telescopic rod drives the fixed rod 2211 and the scraper body 2212 to move along the vertical direction. The outer diameter of the scraper body 2212 is smaller than the inner diameter of the filter cartridge 1, but will not differ too much from the inner diameter of the filter cartridge 1, so as to ensure the scraper 221 to remove impurities on the filter screen 11.

[0043] In this design, the two corresponding sides of the scraper body 2212 along the horizontal direction are set to an arc structure to adapt to the arc structure of the filter screen 11, increase the scraping range of the scraper body 2212 in the horizontal direction, and thus increase the cleaning effect of impurities.

[0044] In some embodiments, the detection member 21 includes a pressure sensor disposed on the filter cartridge 1 . The pressure sensor is provided with a detection probe 211 . The detection probe 211 is located at the liquid inlet side of the filter screen 11 .

[0045] In this design, the pressure of the fluid flowing through the filter cartridge 1 can be detected by the detection probe 211, and the detected pressure information is transmitted to the pressure sensor. When the pressure information detected by the pressure sensor is greater than the first preset pressure value, the cleaning member 22 cleans the filter screen 11; when the pressure information detected by the pressure sensor is greater than the second preset pressure value, the loosening member 23 acts on the filter screen 11 to loosen the impurities blocking the filter screen 11. During this process, the cleaning member 22 continues to clean the filter screen 11 to increase the impurity removal effect of the filter screen 11. The structure is simple and the measurement results are accurate. Among them, the way in which the pressure sensor detects the fluid pressure through the detection probe 211 is a conventional technology in the field and is not described in detail here.

[0046] In some embodiments, Figure 2 As shown, one side of the scraper body 2212 facing the liquid inlet end of the filter cartridge 1 protrudes from the fixing rod 2211 , and a receiving cavity 2213 for receiving the detection probe 211 is formed between the protruding portion of the scraper body 2212 and the fixing rod 2211 .

[0047] Under this design, a accommodating cavity 2213 can be formed between the scraper body 2212 and the filter cartridge 1, and the detection probe 211 is arranged in the accommodating cavity 2213, so that the overall structure is more compact, and the accommodating cavity 2213 is in the shape of a groove. When the fluid flowing into the filter cartridge 1 acts on the groove, the detection probe 211 can detect the pressure of the fluid to ensure the accuracy of the detection result.

[0048] In some embodiments, the loosening member 23 includes a plurality of elastic struts 231 extending in the vertical direction, the elastic struts 231 are bent and extended, the filter screen 11 is connected to the filter cartridge 1 through the plurality of elastic struts 231, and as the elastic struts 231 are bent and extended, the filter cartridge 1 is provided with a second driving member for driving the plurality of elastic struts 231 to stretch or reset. The filter screen 11 is arranged in the middle of the filter cartridge 1, and the scraper 221 fits the center line of the filter screen 11 to ensure the cleaning effect of the scraper 221 on the filter screen. The 3-5 equidistant nodes of the elastic strut 231 are each provided with a bending portion, and the bending portion makes the elastic strut 231 folded in a normal state.

[0049] Specifically, the bottom end of the elastic support rod 231 is connected to the bottom wall of the filter cartridge 1, and the top end of the elastic support rod 231 is connected to the bottom end of the second driving member. Under normal conditions, the elastic support rod 231 is in a bent state, and the bending positions of the multiple elastic support rods 231 are opposite in the horizontal direction. The filter screen 11 is fixedly connected to the corresponding position of the elastic support rod 231, so that the filter screen 11 can bend along with the elastic support rod 231. The second driving member is arranged in the integrated box 4 at the top of the filter cartridge 1, and the top of the bent elastic support rod 231 is located in the avoidance port, so that the top of the bent filter screen 11 is located in the avoidance port, ensuring that the filter screen 11 can cover the entire cross-section of the filter cartridge 1 and ensure the filtering effect of impurities. In addition, the avoidance port should have a certain size to avoid the stretching of the elastic support rod 231 and the filter screen 11. Among them, the first driving member and the second driving member are opposite in the horizontal direction, and the elastic support rod 231 and the scraper 221 are opposite in the horizontal direction, but they will not interfere with each other.

[0050] Under this design, the elastic support rod 231 is stretched by the second driving member, so that the elastic support rod 231 can drive the top of the filter screen 11 to move upward and stretch the filter screen 11. In addition, the elastic support rod 231 is lowered by the second driving member, and the elastic support rod 231 is reset under the action of its own elastic force, thereby driving the filter screen 11 to bend. The elastic support rod 231 and the filter screen 11 can be repeatedly stretched and bent by the second driving member, thereby changing the position of impurities on the filter screen 11, so as to cooperate with the scraper body 2212 to remove impurities on the filter screen 11 and ensure the impurity removal effect.

[0051] In some embodiments, the second driving member includes a driving motor and a plurality of pull ropes 232, a reel 233 is provided at the output end of the driving motor, the bottom ends of the plurality of pull ropes 232 are respectively connected to the top ends of the plurality of elastic struts 231, and the top ends of the plurality of pull ropes 232 are wound around the reel 233. The driving motor is arranged in the integrated box 4, the rotating shaft of the driving motor extends in the horizontal direction, and the reel 233 is arranged on the rotating shaft of the driving motor so that the reel 233 can be driven to rotate by the driving motor. It is understandable that, in order to facilitate the control of the rotation speed, a gearbox can also be provided at the output end of the driving motor, and the reel 233 is provided at the output end of the gearbox. The pull rope 232 is passed through the top of the filter cartridge 1, and the pull rope 232 is sealed and connected to the filter cartridge 1 to ensure the sealing effect of the filter cartridge 1.

[0052] In this design, the reel 233 can be driven to rotate by the driving motor, so that the pull rope 232 can be wound around the reel 233 as the reel 233 rotates, so that the elastic support rod 231 is pulled upward by the bottom end of the pull rope 232 to achieve the stretching of the elastic support rod 231, and the pull rope 232 can be gradually loosened by the reverse rotation of the reel 233, so that the pull rope 232 releases the elastic support rod 231, and the elastic support rod 231 is reset under the action of its own elastic force. The elastic support rod 231 can be stretched or bent by the forward and reverse rotation of the driving motor, which is convenient to operate.

[0053] In some embodiments, a plurality of guide wheels are disposed on the filter cartridge 1 , and the guide wheels are vertically opposite to the top ends of the plurality of elastic support rods 231 , and a plurality of pull ropes 232 are passed around the corresponding guide wheels.

[0054] In this design, the guide wheel is provided to guide the pulling direction of the pull rope 232 , so that the pull rope 232 can provide a vertical upward force to the top of the elastic support rod 231 , thereby ensuring the stretching effect of the elastic support rod 231 .

[0055] In some embodiments, the elastic support rod 231 is made of shape memory alloy, shape memory polymer, graphene or carbon fiber composite material.

[0056] The elastic support rod 231 of this material has a certain elasticity, so that the elastic support rod 231 can be stretched under the action of external force and reset under its own elasticity, so as to drive the reciprocating stretching and bending of the filter screen 11 to meet the use requirements of the filter screen 11.

[0057] In some embodiments, a rotating plate 311 is provided at the entrance of the storage box 31, and the rotating plate 311 can be turned downward by force and reset after the force disappears. A spring is provided on the rotating shaft side of the rotating plate 311, and the spring can provide an upward force on the non-rotating shaft side of the rotating plate 311, so that the rotating plate 311 can be reset and extended in the horizontal direction when no external force is applied (the end position of the rotating plate 311 can be limited by the baffle at the entrance of the storage box 31, so that the rotating plate 311 extends horizontally), so as to block the entrance of the storage box 31, prevent the impurities in the storage box 31 from escaping from the storage box 31, and ensure the collection effect of the impurities.

[0058] In some embodiments, the non-rotation axis side of the rotating plate 311 extends upwardly at an angle to prevent the rotating plate 311 from folding under the force of the fluid, thereby preventing the impurities in the storage box 31 from escaping from the storage box 31 .

[0059] It is understandable that the rotating plate 311 may also extend in the horizontal direction. In this case, the spring provides sufficient support force for the rotating plate 311 to prevent the plate from folding under the force of the fluid.

[0060] In some embodiments, the storage box 31 protrudes toward the liquid inlet end of the filter cartridge 1 .

[0061] In this design, when the filter cartridge 1 is connected to the valve body, the raised position of the storage box 31 extends to the bottom of the valve body, thereby reducing space occupation.

[0062] In some embodiments, the cross section of the filter cartridge 1 is circular or rectangular. It can be seen that the shape of the filter cartridge 1 is not limited and can be selected according to actual needs. Figure 1 and Figure 2 As shown, the cross section of the filter cartridge 1 is circular to reduce space occupation and ensure the fluid transmission effect.

[0063] In some embodiments, flange joints 12 are respectively provided at both ends of the filter cartridge 1. The flange joints 12 can be replaced by joints such as oil-free joints.

[0064] In this design, both ends of the filter cartridge 1 are fixedly connected to the valve body of the fracturing fluid tank and the fluid supply hose of the sand mixing vehicle through the flange joints 12, so as to increase the firmness of the connection and the sealing effect of the connection.

[0065] The working process of the filtration device is as follows:

[0066] When the colloidal impurities or other impurities pass through the annular filter cylinder 1 of the filter device, they will be blocked on the filter screen 11. When the filter screen 11 is further blocked by subsequent impurities, the pressure in the pipeline will increase due to the unchanged suction displacement of the sand mixing truck. When the pressure reaches the fixed first preset pressure, the pressure sensor issues a command to make the scraper 221 slide up and down, pushing the colloidal impurities at the filter screen 11 into the storage box 31. When the colloidal impurities at the filter screen 11 have strong adhesion and the scraper 221 cannot peel them off the filter screen 11 and push them into the storage box 31, the pressure is further increased. When it reaches the second preset pressure, the pressure sensor issues a command to make the second driving member drive the elastic support rod 231 to expand and bend back and forth, and then drive the filter screen 11 to expand and bend back and forth through the elastic support rod 231, so that the adhesion of the colloidal impurities decreases. At this time, the scraper 221 is opened again, or the scraper 221 always slides up and down during the reciprocating expansion and bending process of the filter screen 11, so as to push the gelatinous impurities at the filter screen 11 into the storage box 31, thereby ensuring the cleaning effect of the impurities.

[0067] The present invention also provides a valve, including a valve body and the above-mentioned filter device arranged on the valve body. The filter device here includes all the technical features of the above-mentioned filter device. Among them, the valve body is connected to the above-mentioned filter cartridge 1 flange joint 12 to increase the firmness of the connection and the sealing effect of the connection.

[0068] The present invention also provides a fracturing fluid tank, including a tank body and the above-mentioned valve arranged at the liquid outlet of the tank body. The valve here includes all the technical features of the above-mentioned valve, and further includes all the technical features of the above-mentioned filtering device. Among them, one side of the valve body is connected to the liquid outlet flange of the tank body, and the other side of the valve body is connected to the flange joint 12 of the filter cartridge 1, and the other side of the filter cartridge 1 is fixedly connected to the liquid supply hose through the flange joint 12 to increase the firmness of the connection and the sealing effect of the connection.

[0069] The fracturing fluid tank with this design is used for filtering the fracturing fluid during the fracturing operation. The filtration device connected between the valve of the fracturing fluid tank and the fluid supply hose line of the sand mixing truck can filter and store the gel-like impurities and other types of impurities in the fracturing fluid tank, thereby purifying the fracturing fluid, enhancing the sand mixing performance of the fracturing fluid, and thus improving the fracturing transformation effect.

[0070] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0071] The above description is only a specific embodiment of the present invention, so that those skilled in the art can 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 described herein, but should conform to the widest scope consistent with the principles and novel features of the invention described herein.

Claims

1. A filtering device, characterized in that: include: A filter cartridge (1) having a filter screen (11) disposed therein; A cleaning component (2), comprising a detection member (21), a cleaning member (22) and a loosening member (23) arranged in the filter cartridge (1), wherein the detection member (21) is used to detect the pressure of the fluid flowing through the filter cartridge (1), and is configured such that: when it is detected that the pressure of the fluid flowing through the filter cartridge (1) is greater than a first preset pressure, the cleaning member (22) cleans the filter screen (11); when it is detected that the pressure of the fluid flowing through the filter cartridge (1) is greater than a second preset pressure, the loosening member (23) acts on the filter screen (11) to loosen impurities blocking the filter screen (11); as well as The storage assembly (3) comprises a storage box (31) arranged at the bottom of the filter cartridge (1), and the storage box (31) is used to receive impurities cleaned by the cleaning member (22).

2. The filtering device according to claim 1, characterized in that: The cleaning member (22) comprises a scraper (221) arranged in the filter cartridge (1) and a first driving member for driving the scraper (221) to move back and forth in a vertical direction, wherein the scraper (221) is capable of scraping impurities on the filter screen (11) during the vertical movement.

3. The filtering device according to claim 2, characterized in that: The scraper (221) comprises a fixing rod (2211) connected to the driving end of the first driving member and a scraper body (2212) arranged at the bottom of the fixing rod (2211), and two corresponding sides of the scraper body (2212) along the horizontal direction are arc-shaped.

4. The filtering device according to claim 3, characterized in that: The detection element (21) comprises a pressure sensor arranged on the filter cartridge (1), the pressure sensor being provided with a detection probe (211), and the detection probe (211) being located at the liquid inlet side of the filter screen (11).

5. The filtering device according to claim 4, characterized in that: The scraper body (2212) protrudes from the fixing rod (2211) on one side of the liquid inlet end facing the filter cartridge (1); a receiving cavity (2213) for receiving the detection probe (211) is formed between the protruding portion of the scraper body (2212) and the fixing rod (2211).

6. The filtering device according to claim 1, characterized in that: The loosening member (23) comprises a plurality of elastic support rods (231) extending in a vertical direction, the elastic support rods (231) being bent and extended, the filter screen (11) being connected to the filter cartridge (1) via the plurality of elastic support rods (231), and being bent and extended as the elastic support rods (231), the filter cartridge (1) is provided with a second driving member for driving the plurality of elastic support rods (231) to stretch or reset.

7. The filtering device according to claim 6, characterized in that: The second driving member comprises a driving motor and a plurality of pull ropes (232); a reel (233) is provided at the output end of the driving motor; the bottom ends of the plurality of pull ropes (232) are respectively connected to the top ends of the plurality of elastic support rods (231); and the top ends of the plurality of pull ropes (232) are wound around the reel (233).

8. The filtering device according to claim 7, characterized in that: The filter cartridge (1) is provided with a plurality of guide wheels, the guide wheels being located opposite to the top ends of the plurality of elastic support rods (231) in the vertical direction, and the plurality of pull ropes (232) passing around the corresponding guide wheels.

9. The filtering device according to claim 6, characterized in that: The elastic support rod (231) is made of shape memory alloy, shape memory polymer, graphene or carbon fiber composite material.

10. The filtering device according to claim 1, characterized in that: A rotating plate (311) is provided at the entrance of the storage box (31), and the rotating plate (311) can be turned downward by force and return to its original position after the force disappears.

11. The filtering device according to claim 1, characterized in that: The storage box (31) protrudes toward the liquid inlet end of the filter cartridge (1).

12. The filtering device according to claim 1, characterized in that The cross section of the filter cartridge (1) is circular or rectangular.

13. The filtering device according to claim 1, characterized in that: Both ends of the filter cartridge (1) are respectively provided with flange joints (12).

14. A valve, characterized in that: The invention comprises a valve body and a filtering device as claimed in any one of claims 1 to 13 arranged on the valve body.

15. A fracturing fluid tank, characterized in that: The invention comprises a tank body and a valve as claimed in claim 14 arranged at the liquid outlet end of the tank body.

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