Large core-pulling type axial flow pump convenient to overhaul

Abstract

The invention relates to the technical field of axial flow pumps, and particularly discloses a large core-pulling type axial flow pump convenient to overhaul, which comprises a pump main body, the pump main body comprises an adapting pipe, a pump shaft, a shaft protection pipe, a delivery pipe, a liquid outlet elbow and an impeller pipe, a liquid guide pipe is mounted below the delivery pipe, a lower plugging mechanism is mounted below the liquid guide pipe, and a lower plugging mechanism is mounted below the lower plugging mechanism. The lower plugging mechanism is installed above the impeller pipe, a middle guide pipe and a feedback mechanism are arranged in the liquid guide pipe, and the periphery of the shaft protection pipe is sleeved with a floating ring. Through mutual cooperation of the liquid guide pipe, the middle guide pipe, the partition plate, the floating ring, the upper plugging mechanism, the feedback mechanism and the lower plugging mechanism, the pipe diameter when liquid flows through is reduced, so that water flow is more concentrated, the water flow reaches a discharge port of the axial flow pump from the bottom of the axial flow pump, the initial pressure and flow speed of the water flow can be rapidly established, and the water flow efficiency is improved. Therefore, the working efficiency at the time of initial use and small flow is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of axial flow pumps, and in particular relates to a large core-pulling axial flow pump which is easy to repair. Background Art

[0002] The core-pulling axial flow pump is a fluid mechanical equipment widely used in water conservancy, agriculture, construction, municipal administration, petroleum, chemical industry and other fields. Its basic principle is to use the centrifugal force generated by the rotation of the impeller and the inclination angle of the blades to push the liquid toward the axis. This pump has the characteristics of large flow, low head, high efficiency and stable operation. It is particularly suitable for occasions with large flow and low head, such as irrigation, drainage, flood control, etc. Most of the existing core-pulling axial flow pumps can be easily pulled out for maintenance. The extraction procedure is to evenly loosen the connecting bolts and nuts of the motor coupling and the water pump coupling one by one, so that the rotor slowly sinks to rest on the side of the impeller chamber, and then remove the coupling and the connecting bolts → remove the motor, base plate, and main shaft sealing components → remove the pump cover, guide cover, and exhaust valve assembly → lift the remaining extractable parts out at one time and place them on the maintenance bracket → remove the coupling, upper guide bearing, inner cylinder (upper), snap ring coupling between the upper and lower shafts, inner cylinder (middle), inner cylinder (lower), upper pump shaft, middle guide bearing, impeller chamber, impeller, lower pump shaft, lower guide bearing, etc. from top to bottom in turn;

[0003] However, when the above-mentioned existing core-pulling axial flow pump is used for the first time, since the flow rate is small after the bottom impeller starts to rotate, it takes a while for the water at the bottom to be transported to the upper cylinder through the middle cylinder and discharged from the liquid outlet elbow, so the working efficiency during initial use needs to be limited. Summary of the invention

[0004] The purpose of the present invention is to provide a large-scale core-pulling axial flow pump which is easy to repair, so as to solve the problems existing in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A large core-pulling axial flow pump that is easy to repair, comprising a pump body, the pump body comprising a receiving pipe, a pump shaft, a shaft protection pipe, a delivery pipe, a liquid outlet elbow and an impeller pipe, a liquid guide pipe is installed below the delivery pipe, a lower plugging mechanism is installed below the liquid guide pipe, the lower plugging mechanism is installed above the impeller pipe, a middle guide pipe and a feedback mechanism are arranged inside the liquid guide pipe, a floating ring is sleeved on the periphery of the shaft protection pipe, an upper plugging mechanism is movably connected inside the top end of the liquid guide pipe, and the floating ring is used to trigger the upper plugging mechanism;

[0007] A partition is fixedly connected around the periphery of the middle conduit, and a side of the partition away from the middle conduit is fixedly connected to the inner wall of the liquid guiding tube, and a gap between the middle conduit, the partition and the liquid guiding tube constitutes a contraction zone;

[0008] The contraction zone cooperates with the upper blocking mechanism, the lower blocking mechanism and the feedback mechanism to allow the liquid to flow only through the inside of the middle conduit and to retain part of the liquid;

[0009] The upper blocking mechanism comprises a blocking plate 1, and the upper blocking mechanism is used to block the upper port of the contraction zone;

[0010] The lower plugging mechanism comprises an upper connecting pipe, a lower connecting pipe and a second plugging plate, and the lower plugging mechanism is used to plug the lower port of the contraction zone;

[0011] The feedback mechanism includes unit component one, unit component two and unit component three. Sensors are installed inside the unit components one, two and three. The unit component one includes a sealing box, a plug rod and an external airbag. The unit component two includes a receiving box and a linkage plug rod. The unit component three is consistent with the unit component two. The feedback mechanism is used to trigger the blocking or opening of the upper blocking mechanism and the lower blocking mechanism after feedback.

[0012] Preferably: the unit component three is used to allow the upper sealing mechanism and the lower sealing mechanism to simultaneously seal the upper and lower ports of the contraction zone after feedback; the unit component two is used to allow the upper sealing mechanism to open the upper port of the contraction zone and keep the lower sealing mechanism sealing the lower port of the contraction zone after feedback; the unit component one is used to allow the lower sealing mechanism to first seal the lower port of the contraction zone after feedback, and allow the upper sealing mechanism to seal the upper port of the contraction zone.

[0013] Preferably: one end of the sealing box and the receiving box are fixedly connected to the inner wall of the catheter tube and both pass through the middle catheter tube, one end of the connecting rod and the linkage connecting rod are both in contact with the outer wall of the shaft protection tube, and one end of the connecting rod is inserted into the interior of the sealing box and is in contact with a spring 1.

[0014] Preferably: a bottom plate is fixedly connected below the outer airbag, an inner airbag is installed inside the sealing box, the outer airbag is connected to the inner airbag, one end of the linkage plug rod is plugged into the inside of the receiving box and is fitted with spring 2, and the sensors are located at one end of the plug rod and the linkage plug rod.

[0015] Preferably: the upper port of the middle conduit is circular, and the lower port thereof is a regular hexagon; the middle conduit is used to cooperate with the upper blocking mechanism and the lower blocking mechanism for blocking; the blocking plate 1 is located at the upper end of the partition; a receiving block is fixedly connected to the bottom of the blocking plate 1; two ends of the receiving block are rotatably connected to the outer wall of the middle conduit and the inner wall of the catheter through an axis; one end of the receiving block is fixedly connected to a linkage gear through an axis.

[0016] Preferably: the linkage gear is located inside the catheter, the catheter is rotatably connected to a driving gear ring inside, the driving gear ring is meshed with the linkage gear, the lower part of the driving gear ring is meshed with a driving gear, a driving motor is installed outside the upper end of the catheter, the driving gear is fixedly connected to the output end of the driving motor, and a seal is installed on the periphery of the sealing plate.

[0017] Preferably: the upper connecting tube is connected to the lower connecting tube by bolts, a slide groove is provided at the bottom of the upper connecting tube, both sides of the second sealing plate are slidably connected to the inside of the slide groove, and a seal 2 is installed on the periphery of the second sealing plate, and the seal 2 is used to fit the inner wall of the contraction zone.

[0018] Preferably: a servo motor is installed on the periphery of the lower connecting tube, a linkage ring is rotatably connected on the top of the lower connecting tube, the output end of the servo motor is meshedly connected to the bottom of the linkage ring, there are limiting grooves distributed all around the top of the linkage ring, a convex column is fixedly connected on the bottom of the second sealing plate, and the convex column is slidably connected to the inside of the limiting groove.

[0019] Preferably, the liquid outlet elbow is integrated with the outlet pipe, a lower end of the liquid outlet elbow is connected to the liquid guide pipe, and the other end is connected to the outside.

[0020] Preferably: the outer periphery of the pump shaft is sleeved with a shaft protection tube, the shaft protection tube is used to protect the pump shaft, the bottom end of the pump shaft is fixedly connected with an impeller body, the impeller body is located inside the impeller tube, the shaft protection tube passes through the receiving tube, the outlet pipe, the liquid outlet elbow, the middle duct and the impeller tube, the top end of the pump shaft is connected to a large motor through a coupling, the top end of the receiving tube is provided with an end cover, the bottom of the impeller tube is installed with a horn, and the outer periphery of the shaft protection tube is installed with a bearing seat.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention cooperates with the liquid guide tube, the middle guide tube, the partition, the floating ring, the upper blocking mechanism, the feedback mechanism and the lower blocking mechanism. When the impeller body is used for the first time and the flow rate is small, the upper blocking mechanism and the lower blocking mechanism can block the upper and lower ports of the contraction zone under the feedback of the feedback mechanism, so that the liquid can only pass through the inside of the middle guide tube and be discharged from the liquid outlet elbow, thereby reducing the pipe diameter when the liquid flows through, so that the water flow is more concentrated, and then the water flow reaches the discharge port of the axial flow pump from the bottom of the axial flow pump, so that the water flow can quickly build up initial pressure and flow rate, thereby improving the working efficiency during initial use and when the flow rate is small.

[0023] 2. The present invention cooperates with each other through the arrangement of the liquid guiding tube, the middle guiding tube, the partition, the floating ring, the upper blocking mechanism, the feedback mechanism and the lower blocking mechanism. When the floating ring moves upward according to its own buoyancy and the flow velocity of the liquid flowing through, it triggers the upper blocking mechanism, and then the lower blocking mechanism can be started first and then the upper blocking mechanism. In summary, after the pressure and flow velocity of the upper and lower water flows of the axial flow pump are established, the upper and lower ports of the contraction zone are opened, so that the liquid can gradually increase the space when flowing through the middle guiding tube until the flow zone inside the liquid guiding tube is fully utilized, thereby maintaining the original flow rate.

[0024] 3. The present invention cooperates with each other through the arrangement of the liquid guide tube, the middle guide tube, the partition, the floating ring, the upper blocking mechanism, the feedback mechanism and the lower blocking mechanism. When the core-pulling axial flow pump is used up, the floating ring will gradually move down due to the reduction in flow velocity when the liquid flows through the middle guide tube. At this time, the floating ring passes through the unit assembly 1, the unit assembly 2 and the unit assembly 3 in sequence. When the floating ring triggers the unit assembly 3, the upper blocking mechanism and the lower blocking mechanism will block the upper and lower ports of the contraction zone. At this time, part of the liquid will be retained inside the contraction zone, thereby further reducing the time required for the next start of the axial flow pump, thereby further improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall stereogram of the present invention;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention as a whole;

[0027] Figure 3 It is a top view of the liquid guiding tube and the lower blocking mechanism of the present invention;

[0028] Figure 4 It is a schematic diagram of a partial cross-sectional structure of the liquid guiding tube, the upper blocking mechanism and the feedback mechanism of the present invention from a side view;

[0029] Figure 5 It is a structural schematic diagram of the upper blocking mechanism of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the feedback mechanism of the present invention;

[0031] Figure 7 A top view of the catheter of the present invention;

[0032] Figure 8 It is a structural schematic diagram of the lower blocking mechanism of the present invention;

[0033] Fig. 9 For the present invention Figure 8 The structural diagram of the middle part;

[0034] Fig.10 For the present invention Figure 8The structural diagram of the middle part;

[0035] Fig.11 For the present invention Figure 8 Schematic diagram of the structure of the middle part.

[0036] In the figure:

[0037] 1. Pump body; 2. Receiver tube; 3. Pump shaft; 4. Shaft protection tube; 5. Outlet pipe; 6. Liquid outlet elbow; 7. Impeller tube; 8. Impeller body;

[0038] 9. Catheter; 10. Middle catheter; 11. Partition; 12. Floating ring;

[0039] 13. Upper blocking mechanism; 131. Drive gear ring; 132. Drive gear; 133. Drive motor; 134. Blocking plate 1; 135. Receiver block; 136. Seal 1; 137. Linkage gear;

[0040] 14. Feedback organization;

[0041] 141, unit assembly 1; 1411, sealing box; 1412, plug-in rod; 1413, spring 1; 1414, sensor; 1415, inner airbag; 1416, bottom plate; 1417, outer airbag;

[0042] 142, unit component 2; 1421, receiving box; 1422, linkage plug rod; 1423, spring 2;

[0043] 143, unit component three;

[0044] 15. Lower blocking mechanism; 151. Upper connecting tube; 152. Slide groove; 153. Lower connecting tube; 154. Servo motor; 155. Linkage ring; 156. Limiting groove; 157. Blocking plate 2; 158. Boss; 159. Seal 2. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] Reference Figure 1-Figure 11As shown, the present invention provides a large-scale core-pulling axial flow pump that is easy to repair, including a pump body 1, the pump body 1 includes a receiving tube 2, a pump shaft 3, a shaft protection tube 4, a guide tube 5, a liquid outlet elbow 6 and an impeller tube 7, a liquid guide tube 9 is installed below the guide tube 5, a lower plugging mechanism 15 is installed below the liquid guide tube 9, and the lower plugging mechanism 15 is installed above the impeller tube 7, a middle guide tube 10 and a feedback mechanism 14 are arranged inside the liquid guide tube 9, a floating ring 12 is sleeved on the periphery of the shaft protection tube 4, and an upper plugging mechanism 13 is movably connected inside the top of the liquid guide tube 9, and the floating ring 12 is used to trigger the upper plugging mechanism 13; the pump body 1 is a core-pulling axial flow pump in the prior art, and is easy to repair;

[0047] A partition 11 is fixedly connected around the periphery of the middle conduit 10, and a side of the partition 11 away from the middle conduit 10 is fixedly connected to the inner wall of the liquid guiding tube 9, and the gap between the middle conduit 10, the partition 11 and the liquid guiding tube 9 constitutes a contraction zone;

[0048] The contraction zone cooperates with the upper blocking mechanism 13, the lower blocking mechanism 15 and the feedback mechanism 14 to allow the liquid to flow only through the interior of the middle conduit 10 and also to retain part of the liquid;

[0049] The upper blocking mechanism 13 includes a blocking plate 134, and the upper blocking mechanism 13 is used to block the upper port of the contraction zone;

[0050] The lower plugging mechanism 15 includes an upper connecting pipe 151, a lower connecting pipe 153 and a second plugging plate 157. The lower plugging mechanism 15 is used to plug the lower port of the contraction zone.

[0051] The feedback mechanism 14 includes unit component one 141, unit component two 142 and unit component three 143. Sensors 1414 are installed inside unit component one 141, unit component two 142 and unit component three 143. Unit component one 141 includes a sealing box 1411, a plug rod 1412 and an external airbag 1417. Unit component two 142 includes a receiving box 1421 and a linkage plug rod 1422. Unit component three 143 is consistent with unit component two 142. The feedback mechanism 14 is used to trigger the blocking or opening of the upper blocking mechanism 13 and the lower blocking mechanism 15 after feedback.

[0052] Reference Figure 2-Figure 6 In a further embodiment, unit component three 143 is used to allow the upper sealing mechanism 13 and the lower sealing mechanism 15 to simultaneously block the upper and lower ports of the contraction zone after feedback, unit component two 142 is used to allow the upper sealing mechanism 13 to open the upper port of the contraction zone and keep the lower sealing mechanism 15 blocking the lower port of the contraction zone after feedback, and unit component one 141 is used to allow the lower sealing mechanism 15 to block the lower port of the contraction zone first after feedback, and allow the upper sealing mechanism 13 to block the upper port of the contraction zone.

[0053] In this embodiment, the sensor 1414 is a pressure sensor in the prior art, which can be fed back to the external PLC device through the line after being subjected to pressure, thereby driving the operation of the upper blocking mechanism 13 and the lower blocking mechanism 15; the outer periphery of the shaft protection tube 4 is also provided with a limit ring for limiting the height of the floating ring 12; the interior of the floating ring 12 is hollow, and a certain amount of sand is placed, thereby increasing the weight of the floating ring 12, so that the floating ring 12 can float, but a certain flow rate is required; when the plug-in rod 1412 is squeezed and contracted to the inside of the sealing box 1411 by the floating ring 12, the bottom plate 1416 is waited for to squeeze the outer air bag 1417 due to the buoyancy, so that the gas in the outer air bag 1417 enters the interior of the inner air bag 1415 and expands it, thereby allowing the sensor 1414 to contact one end of the plug-in rod 1412, and when the end of the sensor 1414 contacts the plug-in rod 1412, it will be fed back to the external PLC, so that the driving circuit The machine 133 and the servo motor 154 operate; when the linkage rod 1422 is squeezed and shrunk to the inside of the receiving box 1421 by the floating ring 12, one end of the linkage rod 1422 will contact the sensor 1414 in the receiving box 1421, thereby feeding back to the external PLC, so that the drive motor 133 and the servo motor 154 operate; when the sensor 1414 in the unit component 1 141 feeds back, the servo motor 154 will first operate to open the lower port of the contraction zone, and then the drive motor 133 will operate to open the upper port of the contraction zone; when the sensor 1414 in the unit component 2 142 feeds back, the servo motor 154 will operate to block the lower port of the contraction zone, and keep the drive motor 133 open the upper port of the contraction zone; when the sensor 1414 in the unit component 3 143 feeds back, the servo motor 154 will keep blocking the lower port of the contraction zone, and the drive motor 133 will operate to block the upper port of the contraction zone.

[0054] Reference Figure 2-Figure 6 In a further embodiment, one end of the sealing box 1411 and the receiving box 1421 are fixedly connected to the inner wall of the catheter 9 and both pass through the middle catheter 10. One end of the connecting rod 1412 and the linkage connecting rod 1422 are both in contact with the outer wall of the shaft protection tube 4. One end of the connecting rod 1412 is inserted into the interior of the sealing box 1411 and is in contact with a spring 1413.

[0055] In this embodiment, the sealing box 1411 and the receiving box 1421 are both provided with seals at their penetration points, and both have certain cut surfaces at their upper and lower ends to avoid blocking the water flow, and the same is true for the upper and lower ends of the floating ring 12; the upper end of the middle conduit 10 is concentric with the liquid guiding tube 9, and the partition 11 divides the gap between the middle conduit 10 and the liquid guiding tube 9 into six equal parts, thereby forming a contraction zone; the sensors 1414 are all connected to the external PLC device through lines.

[0056] Reference Figure 2-Figure 6In a further embodiment, a bottom plate 1416 is fixedly connected to the lower part of the outer airbag 1417, an inner airbag 1415 is installed inside the sealing box 1411, the outer airbag 1417 is connected to the inner airbag 1415, one end of the linkage plug rod 1422 is plugged into the inside of the receiving box 1421, and a spring 2 1423 is attached thereto, and the sensor 1414 is located at one end of the plug rod 1412 and the linkage plug rod 1422.

[0057] In this embodiment, after being retracted, one end of the connecting rod 1412 and the linkage connecting rod 1422 will contact the sensor 1414 for feedback, and there is a sealing ring at the connection; the ends of the connecting rod 1412 and the linkage connecting rod 1422 that contact the shaft protection tube 4 begin to have cut surfaces, thereby facilitating the squeezing of the floating ring 12 so that the connecting rod 1412 and the linkage connecting rod 1422 can enter passively.

[0058] Reference Figure 3-Figure 5 In a further embodiment, the upper port of the middle conduit 10 is circular, and the lower port thereof is a regular hexagon. The middle conduit 10 is used to cooperate with the upper blocking mechanism 13 and the lower blocking mechanism 15 for blocking. A blocking plate 134 is located at the upper end of the partition 11. A receiving block 135 is fixedly connected to the bottom of the blocking plate 134. Both ends of the receiving block 135 are rotatably connected to the outer wall of the middle conduit 10 and the inner wall of the catheter 9 through an axis. One end of the receiving block 135 is fixedly connected to a linkage gear 137 through an axis.

[0059] In this embodiment, when the driving motor 133 is in operation, the driving gear 132 causes the driving gear ring 131 to rotate inside the catheter 9, thereby causing the linkage gear 137 to rotate ninety degrees with the receiving block 135, the sealing plate 134 and the sealing member 136, thereby sealing the upper port of the contraction zone.

[0060] Reference Figure 3-Figure 5 In a further embodiment, the linkage gear 137 is located inside the catheter 9, and the inside of the catheter 9 is rotatably connected to a driving gear ring 131, the driving gear ring 131 is meshed with the linkage gear 137, and the lower part of the driving gear ring 131 is meshed with a driving gear 132, a driving motor 133 is installed on the outside of the upper end of the catheter 9, the driving gear 132 is fixedly connected to the output end of the driving motor 133, and a sealing member 136 is installed on the periphery of the sealing plate 134.

[0061] In this embodiment, the periphery of the sealing member 136 fits the shape of the sealing plate 134, so that the sealing can be maintained after sealing.

[0062] Reference Figure 2-Figure 11In a further embodiment, the upper connecting tube 151 is connected to the lower connecting tube 153 by bolts, a slide groove 152 is opened at the bottom of the upper connecting tube 151, and both sides of the second sealing plate 157 are slidably connected inside the slide groove 152. A second sealing member 159 is installed on the periphery of the second sealing plate 157, and the second sealing member 159 is used to fit the inner wall of the contraction zone.

[0063] In this embodiment, when the servo motor 154 is started, the linkage ring 155 is rotated inside the lower connecting tube 153, so that the second sealing plate 157 and the second sealing member 159 are gradually brought together from the periphery, thereby sealing the lower port of the contraction zone.

[0064] Reference Figure 2-Figure 11 In a further embodiment, a servo motor 154 is installed on the outer periphery of the lower connecting tube 153, and a linkage ring 155 is rotatably connected to the upper part of the lower connecting tube 153. The output end of the servo motor 154 is meshedly connected to the lower part of the linkage ring 155. There are limit grooves 156 distributed around the upper part of the linkage ring 155, and a boss 158 is fixedly connected to the lower part of the sealing plate 157, and the boss 158 is slidably connected to the inside of the limit groove 156.

[0065] In this embodiment, the second blocking plate 157 is restricted by the slide groove 152 and is restricted by the limit groove 156 through the protruding column 158, so that when the linkage ring 155 rotates, multiple second blocking plates 157 can be simultaneously close to the middle conduit 10, thereby blocking the lower port of the contraction zone.

[0066] Reference Figure 1-Figure 2 In a further embodiment, the liquid outlet elbow 6 is integrated with the outlet pipe 5, the lower end of the liquid outlet elbow 6 is connected to the liquid guide pipe 9, and the other end is connected to the outside.

[0067] In this embodiment, when the large motor of the existing core-pulling axial flow pump drives the pump shaft 3 to rotate, thereby rotating the impeller body 8, the water at the bottom of the pump will pass through the impeller tube 7, the liquid guide tube 9, the middle guide tube 10 and the liquid outlet elbow 6 in sequence, thereby being pumped.

[0068] Reference Figure 1-Figure 2 In a further embodiment, a shaft protection tube 4 is sleeved on the periphery of the pump shaft 3, and the shaft protection tube 4 is used to protect the pump shaft 3. The bottom end of the pump shaft 3 is fixedly connected with an impeller body 8, and the impeller body 8 is located inside the impeller tube 7. The shaft protection tube 4 passes through the receiving tube 2, the outlet tube 5, the liquid outlet elbow 6, the middle duct 10 and the impeller tube 7. The top of the pump shaft 3 is connected to a large motor through a coupling, the top of the receiving tube 2 is provided with an end cover, a horn is installed at the bottom of the impeller tube 7, and a bearing seat is installed on the periphery of the shaft protection tube 4.

[0069] In this embodiment, a filter screen is provided at the bell mouth at the bottom of the existing impeller tube 7; when the pump body 1 is inspected, the bolts at the connection can be removed in sequence, and the impeller body 8 can be removed before the pump shaft 3 is pulled out.

[0070] The working principle of the present invention is as follows:

[0071] When the driving motor 133 is in operation, the driving gear 132 causes the driving gear ring 131 to rotate inside the catheter 9, thereby causing the linkage gear 137 to rotate 90 degrees with the receiving block 135, the blocking plate 134 and the sealing member 136, thereby blocking the upper port of the contraction zone;

[0072] When the servo motor 154 is started, the linkage ring 155 is rotated inside the lower connecting tube 153, so that the second blocking plate 157 and the second sealing member 159 are gradually brought together from the periphery, thereby blocking the lower port of the contraction zone;

[0073] When the plug-in rod 1412 is squeezed and shrunk into the sealing box 1411 by the floating ring 12, the bottom plate 1416 is allowed to squeeze the outer air bag 1417 due to the buoyancy, so that the gas in the outer air bag 1417 enters the inner air bag 1415 and expands it, so that the sensor 1414 can contact one end of the plug-in rod 1412. When the end of the sensor 1414 contacts the plug-in rod 1412, it will feedback to the external PLC, so that the drive motor 133 and the servo motor 154 can operate;

[0074] When the linkage rod 1422 is squeezed and retracted into the receiving box 1421 by the floating ring 12, one end of the linkage rod 1422 will contact the sensor 1414 in the receiving box 1421, thereby feeding back to the external PLC, so that the drive motor 133 and the servo motor 154 operate;

[0075] When the sensor 1414 in the unit component 141 gives feedback, the servo motor 154 is operated to open the lower port of the contraction zone first, and then the drive motor 133 is operated to open the upper port of the contraction zone;

[0076] When the sensor 1414 in the second unit component 142 gives feedback, the servo motor 154 will operate to block the lower port of the contraction zone, and the driving motor 133 will keep opening the upper port of the contraction zone;

[0077] When the sensor 1414 in the unit component 3 143 gives feedback, the servo motor 154 will keep blocking the lower port of the contraction zone, and the drive motor 133 will operate to block the upper port of the contraction zone;

[0078] When the large motor of the core-pulling axial flow pump drives the pump shaft 3 to rotate, thereby rotating the impeller body 8 and starting to transport the liquid at the bottom of the pump, during this process, the initial drive of the impeller body 8 will cause part of the liquid to pass through the inside of the middle conduit 10, thereby passing above the floating ring 12, thereby triggering the sensor in the unit component three 143 and feeding back to the drive motor 133 and the servo motor 154, so that the upper and lower ports of the contraction zone are blocked, so that the liquid can only flow through the inside of the middle conduit 10, at this time, the space when the whole flow passes can be reduced, so that the liquid can reach the upper port of the middle conduit 10 more quickly and be discharged through the liquid outlet elbow 6, thereby improving the working efficiency;

[0079] When the liquid flows through the middle conduit 10, the flow rate increases, so that the floating ring 12 rises quickly. When the floating ring 12 moves up to the unit component 141, the lower port and the upper port of the contraction zone are opened successively, so that the bottom liquid can first enter the contraction zone and then flow out from the upper port of the contraction zone, connecting with the liquid that has flowed through before, thereby gradually expanding the flow area and maintaining the original pumping volume.

[0080] When the water at the bottom of the core-pulling axial flow pump gradually decreases and the flow rate inside the middle conduit 10 is reduced, the floating ring 12 will slowly move down to the unit component 2 142. At this time, the bottom port of the contraction zone is closed, but the upper port of the contraction zone is opened, so that the interior of the contraction zone can begin to store liquid, and the liquid can be retained continuously before the floating ring 12 reaches the unit component 3 143. When the floating ring 12 reaches the unit component 3 143, the upper port of the contraction zone will be blocked. Therefore, when the core-pulling axial flow pump stops operating, part of the liquid will be intentionally retained inside the contraction zone, and at this time, the upper and lower ports of the contraction zone are blocked, which can facilitate the next use, and when used next time, the time for the liquid to enter the contraction zone will be shortened, thereby further improving work efficiency.

[0081] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-scale core-pulling axial flow pump that is easy to maintain, comprising a pump body (1), characterized in that: The pump body (1) comprises a receiving tube (2), a pump shaft (3), a shaft protection tube (4), a delivery tube (5), a liquid outlet elbow (6) and an impeller tube (7); a liquid guide tube (9) is installed below the delivery tube (5); a lower blocking mechanism (15) is installed below the liquid guide tube (9); the lower blocking mechanism (15) is installed above the impeller tube (7); a middle guide tube (10) and a feedback mechanism (14) are arranged inside the liquid guide tube (9); a floating ring (12) is sleeved on the periphery of the shaft protection tube (4); an upper blocking mechanism (13) is movably connected inside the top end of the liquid guide tube (9); the floating ring (12) is used to trigger the upper blocking mechanism (13); A partition plate (11) is fixedly connected around the periphery of the middle conduit (10); a side of the partition plate (11) away from the middle conduit (10) is fixedly connected to the inner wall of the liquid guiding tube (9); and a gap between the middle conduit (10), the partition plate (11) and the liquid guiding tube (9) forms a contraction zone; The contraction zone cooperates with the upper blocking mechanism (13), the lower blocking mechanism (15) and the feedback mechanism (14) to allow the liquid to flow only through the interior of the middle conduit (10) and also to retain part of the liquid; The upper blocking mechanism (13) comprises a blocking plate 1 (134), and the upper blocking mechanism (13) is used to block the upper port of the contraction zone; The lower blocking mechanism (15) comprises an upper connecting pipe (151), a lower connecting pipe (153) and a second blocking plate (157), and the lower blocking mechanism (15) is used to block the lower port of the contraction zone; The feedback mechanism (14) comprises a unit component one (141), a unit component two (142) and a unit component three (143); each of the unit components one (141), two (142) and three (143) is provided with a sensor (1414); the unit component one (141) comprises a sealing box (1411), a plug rod (1412) and an external air bag (1417); the unit component two (142) comprises a receiving box (1421) and a linkage plug rod (1422); the unit component three (143) is consistent with the unit component two (142); the feedback mechanism (14) is used to trigger the blocking or opening of the upper blocking mechanism (13) and the lower blocking mechanism (15) after feedback.

2. A large-scale core-pulling axial flow pump that is easy to maintain according to claim 1, characterized in that: The unit component three (143) is used to allow the upper blocking mechanism (13) and the lower blocking mechanism (15) to simultaneously block the upper and lower ports of the contraction zone after feedback; the unit component two (142) is used to allow the upper blocking mechanism (13) to open the upper port of the contraction zone and keep the lower blocking mechanism (15) blocking the lower port of the contraction zone after feedback; and the unit component one (141) is used to allow the lower blocking mechanism (15) to block the lower port of the contraction zone first after feedback, and allow the upper blocking mechanism (13) to block the upper port of the contraction zone.

3. A large-scale core-pulling axial flow pump that is easy to maintain according to claim 1, characterized in that: One end of the sealing box (1411) and the receiving box (1421) are both fixedly connected to the inner wall of the catheter tube (9) and both pass through the middle catheter tube (10); one end of the plug rod (1412) and the linkage plug rod (1422) are both in contact with the outer wall of the shaft protection tube (4); one end of the plug rod (1412) is plugged into the interior of the sealing box (1411) and is in contact with a spring 1 (1413).

4. A large-scale core-pulling axial flow pump that is easy to maintain according to claim 1, characterized in that: A bottom plate (1416) is fixedly connected to the lower part of the outer airbag (1417), an inner airbag (1415) is installed inside the sealing box (1411), the outer airbag (1417) is connected to the inner airbag (1415), one end of the linkage plug rod (1422) is plugged into the inside of the receiving box (1421), and a spring 2 (1423) is attached thereto, and the sensor (1414) is located at one end of the plug rod (1412) and the linkage plug rod (1422).

5. A large-scale core-pulling axial flow pump that is easy to maintain according to claim 1, characterized in that: The upper end of the middle conduit (10) is circular, and the lower end thereof is a regular hexagon. The middle conduit (10) is used to cooperate with the upper blocking mechanism (13) and the lower blocking mechanism (15) for blocking. The blocking plate (134) is located at the upper end of the partition (11). The bottom of the blocking plate (134) is fixedly connected to a receiving block (135). The two ends of the receiving block (135) are rotatably connected to the outer wall of the middle conduit (10) and the inner wall of the liquid guiding tube (9) via an axis. One end of the receiving block (135) is fixedly connected to a linkage gear (137) via an axis.

6. A large-scale core-pulling axial flow pump that is easy to maintain according to claim 5, characterized in that: The linkage gear (137) is located inside the catheter (9), and the inside of the catheter (9) is rotatably connected to a driving gear ring (131), and the driving gear ring (131) is meshedly connected to the linkage gear (137). The lower part of the driving gear ring (131) is meshedly connected to a driving gear (132). A driving motor (133) is installed on the outside of the upper end of the catheter (9), and the driving gear (132) is fixedly connected to the output end of the driving motor (133). A sealing member (136) is installed on the periphery of the sealing plate (134).

7. A large-scale core-pulling axial flow pump that is easy to maintain according to claim 1, characterized in that: The upper connecting tube (151) is connected to the lower connecting tube (153) by bolts. A slide groove (152) is provided at the bottom of the upper connecting tube (151). Both sides of the second sealing plate (157) are slidably connected to the inside of the slide groove (152). A second sealing member (159) is installed on the periphery of the second sealing plate (157). The second sealing member (159) is used to fit the inner wall of the contraction zone.

8. The large-scale core-pulling axial flow pump that is easy to maintain according to claim 1 is characterized in that: A servo motor (154) is installed on the periphery of the lower connecting tube (153); a linkage ring (155) is rotatably connected to the top of the lower connecting tube (153); an output end of the servo motor (154) is meshingly connected to the bottom of the linkage ring (155); a plurality of limiting grooves (156) are evenly distributed around the top of the linkage ring (155); a convex column (158) is fixedly connected to the bottom of the second sealing plate (157); and the convex column (158) is slidably connected to the inside of the limiting groove (156).

9. The large-scale core-pulling axial flow pump that is easy to maintain according to claim 1 is characterized in that: The liquid outlet curved pipe (6) is integrated with the outlet pipe (5); the lower end of the liquid outlet curved pipe (6) is connected to the liquid guide pipe (9), and the other end is connected to the outside.

10. The large-scale core-pulling axial flow pump that is easy to maintain according to claim 1 is characterized in that: The outer periphery of the pump shaft (3) is sleeved with a shaft protection tube (4), the shaft protection tube (4) is used to protect the pump shaft (3), the bottom end of the pump shaft (3) is fixedly connected with an impeller body (8), the impeller body (8) is located inside the impeller tube (7), the shaft protection tube (4) passes through the receiving tube (2), the outlet tube (5), the liquid outlet elbow (6), the middle duct (10) and the impeller tube (7), the top end of the pump shaft (3) is connected to a large motor through a coupling, the top end of the receiving tube (2) is provided with an end cover, the bottom of the impeller tube (7) is provided with a horn, and the outer periphery of the shaft protection tube (4) is provided with a bearing seat.

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