Pre-filtering device of heat exchanger for underground hot dry rock exploitation and utilization

Abstract

The invention relates to the field of geothermal energy exploitation, in particular to a heat exchanger front filtering device for underground hot dry rock exploitation and utilization. The device comprises a connecting shell, the connecting shell is provided with a water inlet and a water outlet, two filtering cavities are formed in the connecting shell, sliding shells are slidably connected into the filtering cavities, and filtering plates are arranged in the sliding shells; the switching shell is connected into the connecting shell in a sliding mode, and three through holes are formed in the switching shell; and the plugging piece is connected into the switching shell in a sliding mode, and the plugging piece is used for plugging the two through holes of the switching shell at the same time. The working states of the two filtering cavities are switched by moving the switching shell, plugging of the through holes in the switching shell is relieved by combining the plugging piece when a large number of particles appear in water flow, and meanwhile, the two filtering plates are used for filtering, so that the stability of the filtering efficiency of the device is guaranteed, and the situation that the abrasion degree of the filtering plates is increased, and the filtering effect of the filtering plates is affected is avoided.

Description

Technical Field

[0001] The invention relates to the field of geothermal energy exploitation, and in particular to a heat exchanger pre-filter device for exploitation of underground hot dry rocks. Background Art

[0002] Underground hot dry rock mining and utilization technology is a method of developing deep geothermal resources through artificial means. It aims to extract high-temperature heat from the earth's interior for power generation or direct heating. Most underground hot dry rocks are sandstone or conglomerate. In this process, deep wells are first drilled to reach the hot dry rock layer thousands of meters underground, and then the rock cracks are enlarged by methods such as hydraulic fracturing. After that, the ground pump station will inject high-pressure cold water into the ground. When the cold water flows through these enlarged cracks, it absorbs the heat in the rock and becomes high-temperature and high-pressure hot water before being pumped back to the ground. In the existing underground hot dry rock mining and utilization process, the high-temperature and high-pressure water flow drawn from the underground first passes through a simple filtering mechanism to remove larger stones and other solid impurities. Subsequently, the water flow enters the pre-filter device, further removes tiny particles, sand and minerals, and then enters the heat exchanger. The heat exchanger extracts and utilizes the heat in the water flow.

[0003] However, during the operation of the existing pre-filter device of the heat exchanger, since the type of hot dry rock is sandstone or conglomerate, a large amount of sand or minerals will be produced from time to time in all the water flowing out from the ground, so that a large number of particles will appear from time to time in the water flowing into the filter device, causing the filter screen of the filter device to be quickly blocked, increasing the working load of the filter screen, accelerating the damage of the filter screen, and shortening the service life of the filter screen. At the same time, the blockage of the filter screen will cause the working efficiency of the filter device to decrease, thereby reducing the overall efficiency of the system and affecting the heat extraction effect. Summary of the invention

[0004] In order to solve the problem that a large number of particles appearing irregularly in the water flow may cause the filter to work at a high load and be damaged, the present invention provides a pre-filter device for a heat exchanger used in underground hot dry rock mining.

[0005] Technical solution: A pre-filter device for a heat exchanger used for underground hot dry rock mining, comprising: a connecting shell, the connecting shell being provided with a water inlet and a water outlet, two filter chambers being arranged in the connecting shell, a one-way valve being arranged at the lower part of the filter chamber, a sliding shell being slidably connected in the filter chamber, a filter plate being arranged in the sliding shell; a switching shell being slidably connected in the connecting shell, the switching shell being provided with three through holes, the through holes of the switching shell being used to control the alternating operation of the two filter chambers; a blocking member being slidably connected in the switching shell, the blocking member being used to simultaneously block the two through holes of the switching shell; two recoil mechanisms, both arranged on the connecting shell, for cleaning impurities on the filter plate by recoil; and two replacement mechanisms, both arranged on the connecting shell, for automatically replacing the damaged filter plate.

[0006] As a preferred embodiment of the present invention, the recoil mechanism includes: a water pump, fixedly connected to the connecting shell, the water pump is connected to two guide pipes, one of the guide pipes is connected to the water outlet of the connecting shell, and the other of the guide pipes is connected to the filter chamber; a sliding bent plate, slidably connected to the filter chamber, a first spring is fixedly connected between the sliding bent plate and the filter chamber, and the sliding bent plate is used to block the filter chamber; a fixed plate, fixedly connected to the upper part of the sliding shell, two second springs are fixedly connected between the sliding shell and the filter chamber, a through hole is provided on the fixed plate, the filter chamber is connected to a drain pipe, and the fixed plate is used to block the drain pipe; a fixed baffle, fixedly connected to the filter chamber; a control component, arranged on the connecting shell, for controlling the movement of the switching shell and the blocking member.

[0007] As a preferred embodiment of the present invention, turbidity detectors are provided at the water inlet and the water outlet of the connecting shell, a pressure sensing sheet is provided on the lower side of the fixed baffle, and a third spring is fixedly connected between the pressure sensing sheet at the fixed plate and the fixed baffle, and the filtering effect of the filter plate is judged according to the movement of the sliding shell to assist the turbidity detection device.

[0008] As a preferred embodiment of the present invention, the control component includes: a first electric push rod fixedly connected to the connecting shell, the telescopic end of the first electric push rod fixedly connected to the switching shell; a second electric push rod fixedly connected to the switching shell, the telescopic end of the second electric push rod fixedly connected to the sealing member.

[0009] As a preferred embodiment of the present invention, the replacement mechanism includes: a fixed shell, fixedly connected to the connecting shell, the fixed shell is communicated with the filter chamber; a guide shell, fixedly connected to the connecting shell, the guide shell is communicated with the filter chamber; a pushing rack, slidably connected to the fixed shell, two limit blocks are slidably connected in the pushing rack, a fourth spring is fixedly connected between the limit blocks and the pushing rack, positioning plates are provided on both sides of the sliding shell, the positioning plates are used to position the filter plate at the center of the filter chamber and assist in the replacement of the filter plate; a partition assembly is provided on the connecting shell, for assisting in adjusting the position of the positioning plate; a delay assembly is provided on the connecting shell, for controlling the switching sequence of the filter plates.

[0010] As a preferred embodiment of the present invention, the partition assembly includes: two partition plates, both of which are slidably connected to the connecting shell, one of the partition plates is slidably connected between the connecting shell and the fixed shell, and the other of the partition plates is slidably connected between the connecting shell and the guide shell, the opposite ends of the fixed shell and the guide shell are slidably connected with sliding baffles, tension springs are fixed between the fixed shell and the guide shell and the adjacent sliding baffles, and the sliding baffles are used to seal the connecting shell.

[0011] As a preferred embodiment of the present invention, the upper ends of the two partition plates are provided with inclined surfaces, and the distance between the inclined surfaces of the two partition plates gradually decreases from top to bottom. The inclined surfaces of the partition plates are used to assist the two positioning plates in adjusting the position of the sliding shell in the filter plate.

[0012] As a preferred embodiment of the present invention, the delay component includes: a third electric push rod, fixedly connected to the connecting shell, the telescopic end of the third electric push rod is fixedly connected to a connecting bent plate, and the connecting bent plate is fixedly connected to the two partition plates; a first telescopic rod, fixedly connected to the connecting shell, a fifth spring is fixedly connected between the telescopic end of the first telescopic rod and the connecting bent plate; a second telescopic rod, fixedly connected to the fixed shell, the telescopic end of the second telescopic rod is fixedly connected to the pushing rack, the second telescopic rod is connected to the first telescopic rod by a pipeline, and the first telescopic rod and the second telescopic rod are both filled with hydraulic oil.

[0013] As a preferred embodiment of the present invention, it also includes: two buffer mechanisms, both of which are arranged in the corresponding filter chambers, for reducing the impact of the high-pressure water flow entering the filter chamber on the filter plate, the buffer mechanism includes: a fixed cylinder, fixedly connected to the filter chamber, the fixed cylinder is sealingly and slidably connected with a sliding rod, the part of the sliding rod located in the fixed cylinder is provided with two through holes, a one-way valve is provided in one of the through holes of the sliding rod, the sliding rod is limitedly and slidably connected with a sliding support plate, a sixth spring is fixed between the sliding support plate and the fixed cylinder, the sliding support plate cooperates with the fixed baffle to block the filter chamber, and the fixed cylinder is filled with hydraulic oil.

[0014] As a preferred embodiment of the present invention, the sliding support plate has the same shape as the fixed baffle, and the area of ​​the fixed baffle is larger than half of the cross-sectional area of ​​the filter chamber, so as to change the flow path of the water flow in the filter chamber.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] 1. The present invention switches the working states of the two filter chambers by moving the switching shell, and releases the blocking of the through holes on the switching shell when a large number of particles appear in the water flow by combining with the blocking piece, and uses two filter plates for filtering at the same time, thereby ensuring the stability of the filtering efficiency of the device and avoiding the increased wear of the filter plates, which affects the filtering effect of the filter plates.

[0017] 2. The present invention actively replaces the filter plate in the sliding shell through the pusher rack, thereby avoiding the situation where the filter plate continues to work after being damaged, causing minerals to enter the heat exchanger and shortening the service life of the heat exchanger.

[0018] 3. The present invention cooperates with the sliding support plate and the fixed baffle in the buffer mechanism to temporarily block and guide the water flow when it initially enters the filter chamber, thereby reducing the impact of the water flow on the filter plate, protecting the safety of the filter plate, and thus achieving the purpose of extending the service life of the filter plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0020] Figure 2 It is a three-dimensional structural schematic diagram of the connection shell internal mechanism of the present invention;

[0021] Figure 3 It is a cross-sectional view of the parts at the connecting shell and the switching shell of the present invention;

[0022] Figure 4 It is a three-dimensional structural schematic diagram of the parts of the sliding shell and the filter plate of the present invention;

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the parts at the partition plate and the sliding baffle of the present invention;

[0024] Figure 6 It is a three-dimensional structural schematic diagram of the parts at the filter plate and the positioning plate of the present invention;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the parts at the limit block and the positioning plate of the present invention;

[0026] Figure 8 It is a three-dimensional structural schematic diagram of the parts at the fixed plate and the fixed baffle of the present invention;

[0027] Fig. 9 It is a cross-sectional view of the parts at the fixed baffle and the sliding support plate of the present invention.

[0028] Reference numerals:

[0029] 1-connecting shell, 2-filter chamber, 3-sliding shell, 4-filter plate, 5-switching shell, 6-blocking piece, 21-water pump, 22-guide pipe, 23-sliding bent plate, 24-fixed plate, 25-drain pipe, 26-fixed baffle, 31-first electric push rod, 32-second electric push rod, 41-fixed shell, 42-guide shell, 43-push rack, 44-limiting block, 45-positioning plate, 51-partition plate, 52-sliding baffle, 61-third electric push rod, 62-connecting bent plate, 63-first telescopic rod, 64-second telescopic rod, 71-fixed cylinder, 72-sliding rod, 73-sliding support plate. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 -Attached Fig. 9, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] Example 1: During the operation of the existing pre-filter device of the heat exchanger, a large amount of dust will appear in the water flow entering the filter device from time to time, causing the filter in the filter device to work at high load, greatly increasing the degree of blockage and wear of the filter, shortening the service life of the filter. When the filter is blocked, the working efficiency of the filter device will be greatly reduced, affecting the efficiency of the heat exchanger in extracting heat.

[0032] A pre-filter device for heat exchanger used in underground hot dry rock mining. Please refer to the attached Figure 1 -Attached Figure 4As shown, it comprises: a connecting shell 1, the connecting shell 1 is provided with a water inlet and a water outlet, two filter chambers 2 are provided in the connecting shell 1, a one-way valve is provided at the lower part of the filter chamber 2, a sliding shell 3 is slidably connected in the filter chamber 2, and a filter plate 4 is provided in the sliding shell 3; a switching shell 5 is slidably connected in the connecting shell 1, the switching shell 5 is provided with three through holes, and the through holes of the switching shell 5 are used to control the two filter chambers 2 to work alternately; a blocking member 6 is slidably connected in the switching shell 5, and the blocking member 6 is used to simultaneously block the two switching shells 5 through hole; two recoil mechanisms, both arranged on the connection shell 1, for cleaning impurities on the filter plate 4 by recoil; two replacement mechanisms, both arranged on the connection shell 1, for automatically replacing the damaged filter plate 4, the recoil mechanism comprising: a water pump 21, fixedly connected to the connection shell 1, the water pump 21 is connected to two guide pipes 22, one guide pipe 22 is connected to the water outlet of the connection shell 1, and the other guide pipe 22 is connected to the filter chamber 2; a sliding bent plate 23, slidably connected to the filter chamber 2, the sliding bent plate 23 and the filter chamber 2 is fixedly connected with a first spring, and the sliding curved plate 23 is used to block the filter chamber 2; a fixed plate 24 is fixedly connected to the upper part of the sliding shell 3, and two second springs are fixedly connected between the sliding shell 3 and the filter chamber 2. A through hole is provided on the fixed plate 24, and the filter chamber 2 is connected with a drain pipe 25, and the fixed plate 24 is used to block the drain pipe 25; a fixed baffle 26 is fixedly connected to the filter chamber 2; a control component is provided on the connecting shell 1, and is used to control the movement of the switching shell 5 and the blocking member 6. The water inlet and the water outlet of the connecting shell 1 are both provided with A turbidity detector is provided, a pressure sensing sheet is provided on the lower side of the fixed baffle 26, a third spring is fixedly connected between the pressure sensing sheet at the fixed plate 24 and the fixed baffle 26, and the turbidity detection device is assisted by the movement of the sliding shell 3 to judge the filtering effect of the filter plate 4. The control component includes: a first electric push rod 31, which is fixedly connected to the connecting shell 1, and the telescopic end of the first electric push rod 31 is fixedly connected to the switching shell 5; a second electric push rod 32, which is fixedly connected to the switching shell 5, and the telescopic end of the second electric push rod 32 is fixedly connected to the blocking member 6.

[0033] In the above scheme, it is intended to solve the problem that when a large number of particles appear irregularly in the water flow entering the filter, the load on the filter plate 4 in the filter increases rapidly, resulting in a decrease in the working efficiency of the filtering device; the water pump 21, the pressure sensing plate on the lower side of the fixed baffle 26, the turbidity detector, the first electric push rod 31, the second electric push rod 32 and the replacement mechanism are all electrically connected to the control panel, the water inlet of the connecting shell 1 is located on its right side, the water outlet of the connecting shell 1 is located at its lower part, the two filter chambers 2 in the connecting shell 1 are mirror-imaged on the left and right, the three through holes of the switching shell 5 are all located on its lower side, the apertures of the three through holes on the switching shell 5 are the same, the one-way valve at the bottom of the filter chamber 2 only allows the water flow in the filter chamber 2 to flow out from the water outlet of the connecting shell 1, initially the blocking member 6 blocks the left and right two through holes of the three through holes on the switching shell 5, and the water flow entering the connecting shell 1 passes through the through hole in the middle of the switching shell 5 and only enters the right filter chamber 2, By moving the switching shell 5 left and right, the two filter chambers 2 work alternately, and the impurities filtered out of the filter plate 4 are cleaned by backflushing. The elastic coefficient of the second spring connected to the lower side of the sliding shell 3 is greater than the elastic coefficient of all other springs in the device. When high-temperature and high-pressure water flows in the filter chamber 2, the accumulation degree of impurities on the filter plate 4 is judged according to the moving distance of the sliding shell 3, and it is judged whether it is necessary to switch the working filter chamber 2 and perform backflushing cleaning, so as to ensure the continuity of the operation of the device and the stability of the working efficiency. The third spring between the pressure sensing sheet on the lower side of the fixed baffle 26 and the fixed plate 24 is initially in a compressed state. The fixed plate 24 is located on the upper side of the sliding shell 3. The through hole on the fixed plate 24 is connected to the drain pipe 25 only when backflushing is performed in the filter chamber 2. The backflushing water entering the filter chamber 2 pushes the sliding bent plate 23 to move, and cooperates with the movement of the switching shell 5 to block the filter chamber 2, so that the backflushing water flows in one direction.

[0034] Working process: When the device is used as a pre-filtering device of the heat exchanger to exploit and utilize underground hot dry rocks, the high-temperature and high-pressure water flow drawn from the underground enters the water inlet of the connecting shell 1 after simple filtration, and the water flows into the right filter chamber 2 through the through hole in the middle of the switching shell 5. After being filtered by the filter plate 4, the water flows into the heat exchanger from the water outlet of the connecting shell 1. The heat exchanger utilizes and recycles the heat. As the filter plate 4 filters, the filtered impurities accumulate on the filter plate 4, and some filter holes of the filter plate 4 are gradually blocked. The sliding shell 3 and the filter plate 4 gradually move downward and compress the connected second spring. The fixed plate 24 moves downward synchronously with the sliding shell 3, and the third spring between the pressure sensing sheet on the lower side of the fixed baffle 26 and the fixed plate 24 relaxes. The pressure of the pressure sensing sheet on the lower side of the fixed baffle 26 is reduced by the connected third spring, and the movement process of the sliding shell 3 changes slowly and evenly.

[0035] When the filter plate 4 is blocked to a certain extent (if the filter holes on the filter plate 4 continue to be blocked, it will affect the critical point of the heat recovery efficiency of the subsequent heat exchanger), the pressure sensing sheet on the lower side of the fixed baffle 26 determines that the filter plate 4 has reached the set position based on the pressure change of the third spring connected to it, and the control panel starts the first electric push rod 31, the telescopic end of the first electric push rod 31 shrinks, the switching shell 5 moves to the left, the middle through hole of the switching shell 5 is connected to the left filter chamber 2, and the right filter chamber 2 is blocked. Then the control panel closes the first electric push rod 31, and the water entering the connection shell 1 is filtered through the filter plate 4 in the left filter chamber 2. At this time, the control panel starts the water pump 21 on the right, and the water pump 21 draws the water flow from the water outlet of the connection shell 1 through the guide pipe 22 and injects it into the right filter chamber 2. The water flow entering the filter chamber 2 pushes the sliding curved plate 23 to move to the left and compresses the first spring connected to it. The lower part of the filter chamber 2 is closed, and the water flows through the filter plate 4 from bottom to top to achieve the purpose of backwashing. The sliding shell 3 moves upward and compresses the second spring connected to it. The fixed plate 24 moves upward synchronously with the sliding shell 3. The through hole of the fixed plate 24 is connected to the drain pipe 25. Then the water flow carries impurities and is discharged from the drain pipe 25. Then the control panel turns off the water pump 21. The sliding shell 3 moves and resets under the elastic force of the second spring connected to it. The sliding curved plate 23 moves and resets under the elastic force of the first spring connected to it. The drain pipe 25 resumes the blocked state. By switching the left and right movement of the shell 5, the two filter chambers 2 work alternately to ensure the filtering efficiency of the device.

[0036] When the water flow carries a large amount of particles into the connecting shell 1, the filter plate 4 is quickly blocked, and the filter plate 4 moves instantly. The pressure sensing sheet on the lower side of the fixed baffle 26 detects that the movement pattern of the filter plate 4 changes (the speed of the filter plate 4 moves suddenly increases). Combined with the turbidity detector at the water inlet of the connecting shell 1, it detects that the turbidity of the incoming water flow increases, indicating that the number of particles in the water flow suddenly increases. The control panel controls the telescopic end of the second electric push rod 32 to contract, and the blocking member 6 moves to lose the blockage of the through hole on the switching shell 5. The water flows into the two filter chambers 2 at the same time, ensuring the stability of the filtering efficiency of the device. After the turbidity of the flow is restored, the control panel controls the second electric push rod 32 to move and reset the blocking member 6, and the device restores the state of alternating operation of the two filter chambers 2. When the moving speed of the filter plate 4 changes (the moving speed of the filter plate 4 suddenly decreases, or the filter plate 4 suddenly moves in the opposite direction), and at the same time, the turbidity detector at the water outlet of the connecting shell 1 detects an increase in the amount of particles in the water flow, it means that the filter plate 4 is damaged under the impact of the particles in the water flow, and the control panel controls the corresponding replacement mechanism to automatically replace the corresponding filter plate 4, thereby ensuring the continuity of the operation of the device and extending the continuous working time of the device.

[0037] Please refer to the attached Figure 1 -Attached Figure 7As shown, the replacement mechanism includes: a fixed shell 41, fixedly connected to the connecting shell 1, the fixed shell 41 is connected to the filter chamber 2; a guide shell 42, fixedly connected to the connecting shell 1, the guide shell 42 is connected to the filter chamber 2; a pushing rack 43, slidably connected to the fixed shell 41, two limit blocks 44 are slidably connected in the pushing rack 43, a fourth spring is fixedly connected between the limit blocks 44 and the pushing rack 43, and positioning plates 45 are provided on both sides of the sliding shell 3, and the positioning plates 45 are used to position the filter plate 4 at the center of the filter chamber 2 and assist in the replacement of the filter plate 4; a partition assembly is provided on the connecting shell 1, and is used to assist in adjusting the position of the positioning plate 45; a delay assembly is provided on the connecting shell 1, and is used to control the switching sequence of the filter plate 4, and the partition assembly includes: two partition plates 51, both of which are slidably connected to the connecting shell 1, one partition plate 51 is slidably connected between the connecting shell 1 and the fixed shell 41, and the other partition plate 51 is slidably connected between the connecting shell 1 and the guide shell 42, and the fixed shell 41 and the guide shell 42 are opposite to each other. The ends are slidably connected with sliding baffles 52, and tension springs are fixedly connected between the fixed shell 41 and the guide shell 42 and the adjacent sliding baffles 52. The sliding baffles 52 are used to block the connecting shell 1. The upper ends of the two partition plates 51 are provided with inclined surfaces, and the inclined surface spacing of the two partition plates 51 gradually decreases from top to bottom. The inclined surfaces of the partition plates 51 are used to assist the two positioning plates 45 in adjusting the position of the sliding shell 3 in the filter plate 4. The delay component includes: a third electric push rod 61, which is fixed to the connecting shell 1, and the third electric push rod The telescopic end of 61 is fixedly connected to a connecting bent plate 62, and the connecting bent plate 62 is fixedly connected to the two partition plates 51; the first telescopic rod 63 is fixedly connected to the connecting shell 1, and a fifth spring is fixedly connected between the telescopic end of the first telescopic rod 63 and the connecting bent plate 62; the second telescopic rod 64 is fixedly connected to the fixed shell 41, and the telescopic end of the second telescopic rod 64 is fixedly connected to the pushing rack 43, and the second telescopic rod 64 is connected to the first telescopic rod 63 through a pipeline, and the first telescopic rod 63 and the second telescopic rod 64 are both filled with hydraulic oil.

[0038] In the above scheme, the problem that the filter plate 4 may be damaged under the influence of continuous impact of particles carried by water flow is solved, resulting in particles and minerals entering the heat exchanger with the water flow, reducing the service life of the heat exchanger, and the filter plate 4 needs to be shut down when replaced, affecting the efficiency of hot dry rock mining and utilization; the third electric push rod 61 is electrically connected to the control panel, the horizontal plane where the fixed shell 41 and the guide shell 42 are located is flush with the initial position of the sliding shell 3, the upper sides of the two sliding baffles 52 are both provided with inclined surfaces, the inclination direction of the inclined surfaces of the two sliding baffles 52 is the same, the inclined surfaces of the sliding baffles 52 are inclined to the right from top to bottom, the inclined surfaces of the sliding baffles 52 on the fixed shell 41 are used to assist the positioning plate 45 and the filter plate 4 to enter therein, and the inclined surfaces of the sliding baffles 52 on the guide shell 42 are used to assist the positioning plate 45 and the filter plate 4 to be automatically discharged, and the limit block 44 is provided with an inclined surface, and the distance between the inclined surfaces of the two limit blocks 44 gradually decreases from right to left.

[0039] Working process: when the pressure sensing sheet on the lower side of the fixed baffle 26 detects a change in the movement pattern of the filter plate 4 (the speed of the filter plate 4 suddenly decreases, or the filter plate 4 suddenly moves in the opposite direction), and at the same time, the turbidity detector at the water outlet of the connecting shell 1 detects an increase in the amount of particles in the water flow, it indicates that the filter plate 4 in the filter chamber 2 is damaged. At this time, the control panel first controls the switching shell 5 to perform the above-mentioned movement operation, so that the upper part of the filter chamber 2 is blocked, and the lower part of the filter chamber 2 is blocked by the one-way valve on its lower side. Then the control panel starts the third electric push rod 61. The telescopic end of the third electric push rod 61 extends out and drives the two partition plates 51 to move downward through the connecting bent plate 62. The fixed shell 41 and the guide shell 42 are both connected to the filter chamber 2. When the connecting bent plate 62 just starts to move downward, the right partition plate 51 hinders the movement of the positioning plate 45 and the filter plate 4 in the fixed shell 41, and the pushing rack 43 does not move. When the connecting bent plate 62 moves, it is connected to the first extending The fifth spring between the telescopic ends of the retractable rod 63 is compressed. When the fixed shell 41 is connected to the filter chamber 2, the telescopic end of the first telescopic rod 63 contracts under the elastic force of the fourth spring connected thereto, and the hydraulic oil in the first telescopic rod 63 flows into the second telescopic rod 64 through the pipeline. The telescopic end of the second telescopic rod 64 contracts and drives the push rack 43 to move leftward. The push rack 43 pushes the positioning plate 45 and the filter plate 4 in the fixed shell 41 to move into the filter chamber 2 through the limit block 44. The positioning plate 45 and the filter plate 4 in the filter chamber 2 are pushed into the guide shell 42. At this point, the replacement of the filter plate 4 in the sliding shell 3 is completed. Subsequently, the control panel controls the third electric push rod 61 to move and reset the connecting bent plate 62, and the partition plate 51 moves and resets and blocks the fixed shell 41 and the guide shell 42. The connecting bent plate 62 drives the telescopic end of the first telescopic rod 63 to contract through the fifth spring, and the hydraulic oil in the pipeline flows in the opposite direction. The telescopic end of the second telescopic rod 64 pushes the push rack 43 to move and reset.

[0040] After the telescopic end of the third electric push rod 61 is reset, the operator can insert the two positioning plates 45 and a new filter plate 4 into the fixed shell 41. During this process, the positioning plate 45 squeezes the inclined surface of the right sliding baffle 52, and the sliding baffle 52 moves downward and stretches the tension spring connected thereto. After the positioning plate 45 and the filter plate 4 are inserted into the fixed shell 41, the sliding baffle 52 moves and resets under the tension of the tension spring connected thereto, so that the fixed shell 41 remains in a closed state. During the movement, the positioning plate 45 squeezes the inclined surface of the limit block 44, so that the limit block 44 The fourth spring is compressed and moves in opposite directions. When the positioning plate 45 is inserted into the fixed shell 41, the limit block 44 moves and resets under the elastic force of the fourth spring connected thereto. Subsequently, when the filter plate 4 in the sliding shell 3 is damaged again, the above-mentioned operation of replacing the filter plate 4 is repeated. The replaced positioning plate 45 and filter plate 4 in the filter chamber 2 push out the positioning plate 45 and filter plate 4 in the guide shell 42. The inclined surface of the left sliding baffle 52 is squeezed and the above-mentioned movement is repeated. Finally, the closed state is restored in the guide shell 42. At this point, all parts in the device are restored to their initial states.

[0041] Example 2: Based on Example 1, please refer to the attached Figure 3 , Attachment Figure 5 , Attachment Figure 8 and attached Fig. 9 As shown, it also includes: two buffer mechanisms, both of which are arranged in the corresponding filter chamber 2, and are used to reduce the impact of the high-pressure water flow entering the filter chamber 2 on the filter plate 4. The buffer mechanism includes: a fixed cylinder 71, fixedly connected to the filter chamber 2, the fixed cylinder 71 is sealingly and slidably connected with a sliding rod 72, the part of the sliding rod 72 located in the fixed cylinder 71 is provided with two through holes, a one-way valve is provided in one of the through holes of the sliding rod 72, the sliding rod 72 is limitedly and slidably connected with a sliding support plate 73, a sixth spring is fixedly connected between the sliding support plate 73 and the fixed cylinder 71, the sliding support plate 73 cooperates with the fixed baffle 26 to block the filter chamber 2, the fixed cylinder 71 is filled with hydraulic oil, the sliding support plate 73 has the same shape as the fixed baffle 26, the area of ​​the fixed baffle 26 is larger than half of the cross-sectional area of ​​the filter chamber 2, and is used to change the flow path of the water flow in the filter chamber 2.

[0042] In the above scheme, it is intended to solve the problem that when high-temperature and high-pressure water is initially injected into the connecting shell 1 or when the switching shell 5 is switched, the water instantly enters the filter chamber 2, causing the filter plate 4 to be instantly impacted by the water, thereby increasing the possibility of damage to the filter plate 4; the sliding support plate 73 cooperates with the fixed baffle 26 to close the upper part of the filter chamber 2, the fixed cylinder 71 and the sliding support plate 73 are both located above the sliding shell 3, and the sliding support plate 73 is located below the fixed baffle 26, which is used to buffer the water flow entering the filter chamber 2 from the connecting shell 1, and the one-way valve in the through hole of the sliding rod 72 only allows the hydraulic oil on its upper part to flow to its lower part.

[0043] Working process: When the water initially enters the filter chamber 2, taking the filter chamber 2 on the right side as an example, the water entering the filter chamber 2 first impacts the sliding support plate 73, and the sliding support plate 73 moves downward along the sliding rod 72 and compresses the sixth spring connected thereto. A small gap is separated between the sliding support plate 73 and the fixed baffle 26 to allow the water to flow downward. At the same time, the sliding support plate 73 drives the sliding rod 72 to move into the fixed cylinder 71 under the impact of the water flow. The hydraulic oil in the lower part of the fixed cylinder 71 flows to the upper part of the fixed cylinder 71 through a through hole of the sliding rod 72. The sliding rod 72 moves slowly, and the gap between the sliding support plate 73 and the fixed baffle 26 gradually increases. At the same time, the sliding support plate 73 An S-shaped path is formed between the fixed baffle 26 to further buffer the impact of water flow on the filter plate 4. When the switching shell 5 performs the above-mentioned movement operation, the filter chamber 2 is blocked, and the water flow stops entering the filter chamber 2. The above-mentioned backwash operation is performed in the filter chamber 2, and the water flow impacts the sliding support plate 73 from bottom to top. The sliding support plate 73 quickly moves and resets and blocks the upper part of the filter chamber 2 with the fixed baffle 26, guiding the water flow into the drain pipe 25, and the sixth spring connected to the sliding support plate 73 stretches, while driving the sliding rod 72 to move and reset, and the upper hydraulic oil in the fixed cylinder 71 flows to the lower part of the fixed cylinder 71 through the through hole and the one-way valve. At this point, all parts in the device are restored to their initial positions.

[0044] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that technicians in the relevant technical field can understand and use the present invention well. As long as they do not deviate from the structure of the invention or exceed the protection scope of the present invention, they should fall within the protection scope of the present invention.

Claims

1. A heat exchanger pre-filter device for underground hot dry rock mining and utilization, characterized in that: include: A connecting shell (1), the connecting shell (1) being provided with a water inlet and a water outlet, two filter chambers (2) being provided in the connecting shell (1), a one-way valve being provided at the lower part of the filter chamber (2), a sliding shell (3) being slidably connected in the filter chamber (2), and a filter plate (4) being provided in the sliding shell (3); A switching shell (5) is slidably connected in the connecting shell (1), the switching shell (5) being provided with three through holes, and the through holes of the switching shell (5) are used to control the two filter chambers (2) to work alternately; A blocking member (6) is slidably connected in the switching housing (5), and the blocking member (6) is used to simultaneously block the two through holes of the switching housing (5); Two backflushing mechanisms, both arranged on the connecting shell (1), are used to clean impurities on the filter plate (4) by backflushing; Two replacement mechanisms are both arranged on the connecting shell (1) and are used to automatically replace the damaged filter plate (4).

2. The heat exchanger pre-filter device for underground hot dry rock mining and utilization according to claim 1 is characterized in that: The recoil mechanism comprises: A water pump (21) is fixedly connected to the connecting shell (1), and the water pump (21) is connected to two flow guide pipes (22), one of the flow guide pipes (22) is connected to the water outlet of the connecting shell (1), and the other of the flow guide pipes (22) is connected to the filter chamber (2); A sliding bent plate (23) is slidably connected in the filter chamber (2), a first spring is fixedly connected between the sliding bent plate (23) and the filter chamber (2), and the sliding bent plate (23) is used to block the filter chamber (2); A fixed plate (24) is fixedly connected to the upper part of the sliding shell (3), two second springs are fixedly connected between the sliding shell (3) and the filter chamber (2), a through hole is provided on the fixed plate (24), the filter chamber (2) is connected to a drain pipe (25), and the fixed plate (24) is used to block the drain pipe (25); A fixed baffle (26) fixedly connected to the filter chamber (2); A control component is arranged on the connecting shell (1) and is used to control the movement of the switching shell (5) and the blocking member (6).

3. The pre-filter device for heat exchanger for underground hot dry rock mining and utilization according to claim 2 is characterized in that: Turbidity detectors are provided at the water inlet and the water outlet of the connecting shell (1), a pressure sensing sheet is provided on the lower side of the fixed baffle (26), a third spring is fixedly connected between the pressure sensing sheet at the fixed plate (24) and the fixed baffle (26), and the turbidity detection device is assisted in judging the filtering effect of the filter plate (4) according to the movement of the sliding shell (3).

4. The heat exchanger pre-filter device for underground hot dry rock mining and utilization according to claim 3 is characterized in that: The control component comprises: A first electric push rod (31) is fixedly connected to the connecting shell (1), and a telescopic end of the first electric push rod (31) is fixedly connected to the switching shell (5); The second electric push rod (32) is fixedly connected to the switching housing (5), and the telescopic end of the second electric push rod (32) is fixedly connected to the blocking member (6).

5. The heat exchanger pre-filter device for underground hot dry rock mining and utilization according to claim 4 is characterized in that: The replacement mechanism comprises: A fixed shell (41) is fixedly connected to the connecting shell (1), and the fixed shell (41) is in communication with the filter chamber (2); A guide shell (42) is fixedly connected to the connecting shell (1), and the guide shell (42) is communicated with the filter chamber (2); A pusher rack (43) is slidably connected to the fixed shell (41), two limit blocks (44) are slidably connected inside the pusher rack (43), a fourth spring is fixedly connected between the limit blocks (44) and the pusher rack (43), and positioning plates (45) are provided on both sides of the sliding shell (3), and the positioning plates (45) are used to position the filter plate (4) at the center of the filter chamber (2) and assist in the replacement of the filter plate (4); A partition assembly, arranged on the connecting shell (1) and used to assist in adjusting the position of the positioning plate (45); A time delay component is arranged on the connection shell (1) and is used to control the switching sequence of the filter plates (4).

6. The heat exchanger pre-filter device for underground hot dry rock mining and utilization according to claim 5 is characterized in that: The partition assembly comprises: Two partition plates (51) are both slidably connected to the connecting shell (1), one of the partition plates (51) is slidably connected between the connecting shell (1) and the fixed shell (41), and the other of the partition plates (51) is slidably connected between the connecting shell (1) and the guide shell (42), and the opposite ends of the fixed shell (41) and the guide shell (42) are slidably connected with sliding baffles (52), and tension springs are fixedly connected between the fixed shell (41) and the guide shell (42) and the adjacent sliding baffles (52), and the sliding baffles (52) are used to block the connecting shell (1).

7. The pre-filter device for heat exchanger for underground hot dry rock mining and utilization according to claim 6 is characterized in that: The upper ends of the two partition plates (51) are both provided with inclined surfaces, and the distance between the inclined surfaces of the two partition plates (51) gradually decreases from top to bottom. The inclined surfaces of the partition plates (51) are used to assist the two positioning plates (45) in adjusting the position of the sliding shell (3) in the filter plate (4).

8. The heat exchanger pre-filter device for underground hot dry rock mining and utilization according to claim 7 is characterized in that: The delay component comprises: A third electric push rod (61) is fixedly connected to the connecting shell (1); a connecting bent plate (62) is fixedly connected to the telescopic end of the third electric push rod (61); and the connecting bent plate (62) is fixedly connected to both of the two partition plates (51); A first telescopic rod (63) is fixedly connected to the connecting shell (1), and a fifth spring is fixedly connected between the telescopic end of the first telescopic rod (63) and the connecting bent plate (62); The second telescopic rod (64) is fixedly connected to the fixed shell (41), the telescopic end of the second telescopic rod (64) is fixedly connected to the pusher frame (43), the second telescopic rod (64) is connected to the first telescopic rod (63) through a pipeline, and the first telescopic rod (63) and the second telescopic rod (64) are both filled with hydraulic oil.

9. The heat exchanger pre-filter device for underground hot dry rock mining and utilization according to claim 7 is characterized in that: include: Two buffer mechanisms are arranged in the corresponding filter chamber (2) to reduce the impact of the high-pressure water flow entering the filter chamber (2) on the filter plate (4), and the buffer mechanism comprises: A fixed cylinder (71) is fixedly connected to the filter chamber (2); the fixed cylinder (71) is sealingly slidably connected to a sliding rod (72); the portion of the sliding rod (72) located in the fixed cylinder (71) is provided with two through holes; a one-way valve is provided in one of the through holes of the sliding rod (72); the sliding rod (72) is limitedly slidably connected to a sliding support plate (73); a sixth spring is fixedly connected between the sliding support plate (73) and the fixed cylinder (71); the sliding support plate (73) cooperates with the fixed baffle (26) to block the filter chamber (2); and hydraulic oil is filled in the fixed cylinder (71).

10. The heat exchanger pre-filter device for underground hot dry rock mining and utilization according to claim 9, characterized in that: The sliding support plate (73) has the same shape as the fixed baffle (26); the area of ​​the fixed baffle (26) is greater than half the cross-sectional area of ​​the filter chamber (2) and is used to change the flow path of the water flow in the filter chamber (2).

Images