Double-suction centrifugal pump

Abstract

The invention relates to the technical field of centrifugal pumps, in particular to a double-suction centrifugal pump which comprises a pump body and a driving motor fixed to the side face of the pump body and used for driving the pump body to operate. The emptying assembly is mounted on one side of the water inlet pipe of the pump body and communicated with the water inlet pipe; the emptying assembly comprises a mounting pipeline communicated with a water inlet pipe of the pump body, a communicating box is arranged above the mounting pipeline in a communicating mode, a sealing plate is fixedly installed in the middle of the communicating box, a negative pressure box is fixedly installed on the sealing plate, the negative pressure box is communicated with the space below the sealing plate, and an air filtering film is fixedly installed in the negative pressure box. A negative pressure barrel and a rotating frame which are communicated with the negative pressure box are fixedly mounted at the top of the negative pressure box; according to the centrifugal pump, air sucked into the water flow conveying pipe is released before entering the pump body, the air in the water flow is prevented from entering the impeller of the pump body, the situation that the impeller of the pump body is damaged by a large amount of energy released by bubble formation and breakage in the centrifugal process is avoided, and too large noise is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of centrifugal pumps, and in particular to a double-suction centrifugal pump. Background Art

[0002] The double-suction centrifugal pump is a widely used type of centrifugal pump. Its characteristic is that the impeller sucks liquid from both sides at the same time. During the use of the double-suction centrifugal pump, the rotation of the impeller drives the water gathered from both sides to the middle of the impeller to flow to the outside of the impeller, squeezing the water into the drainage pipe.

[0003] During the use of a double-suction centrifugal pump, the liquid flows faster in the suction area of ​​the pump. Due to the centrifugal force, the liquid pressure in the middle of the impeller will drop sharply. If too much air is mixed in the water flow, the formation and rupture of bubbles during the centrifugal process will release a large amount of energy, which will not only generate noise, but also cause damage to the pump body and impeller if air continues to enter the centrifugal pump during long-term operation (the presence of air will increase friction and wear inside the pump). Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a double-suction centrifugal pump, which can effectively solve the problem that during the use of the double-suction centrifugal pump in the prior art, due to pipeline leakage or excessive air entering the suction port, not only will the centrifugal pump generate excessive noise during operation, but if air continues to enter the centrifugal pump, it may cause damage to the pump body and impeller.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: The present invention provides a double-suction centrifugal pump, comprising a pump body and a driving motor fixed to the side of the pump body and used to drive the pump body to operate; The emptying assembly is installed on one side of the water inlet pipe of the pump body and is connected to the water inlet pipe, and is used to empty the air inside the water inlet pipe; The emptying assembly includes an installation pipe connected to the water inlet pipe of the pump body, a connecting box is connected above the installation pipe, a sealing plate is fixedly installed in the middle of the connecting box, the horizontal height of the sealing plate is higher than the top height of the installation pipe, a negative pressure box is fixedly installed on the sealing plate, the negative pressure box is connected to the space below the sealing plate, an air filter membrane for filtering air is fixedly installed inside the negative pressure box, a negative pressure barrel connected to the negative pressure box is fixedly installed on the top of the negative pressure box, and a sliding piston for creating a negative pressure environment is installed inside the negative pressure barrel so as to slide up and down; The rotating frame is used to drive the sliding piston to move up and down.

[0006] Furthermore, a lifting frame is installed above the sealing plate for lifting, and the lower end of the lifting frame is sealed downward through the sealing plate. A floating plate is fixedly installed at the bottom of the lifting frame. The floating plate is used to float inside the installation pipe to drive the lifting frame to move up and down, and the upper end of the lifting frame is used to drive the rotating frame to rotate.

[0007] Furthermore, the rotating frame includes a rotating rod rotatably installed inside the connecting box, and a first connecting rod and a second connecting rod are fixedly installed on both sides of the rotating rod. The first connecting rod and the second connecting rod are respectively rotatably and slidably connected to the lifting frame and the top of the sliding piston.

[0008] Furthermore, an elongated supporting through hole is provided at the end of the second connecting rod away from the rotating rod, and the connecting rod at the top of the sliding piston passes through the supporting through hole and is rotatably and slidably connected to the inner wall of the supporting through hole.

[0009] Furthermore, the length of the first connecting rod is greater than that of the second connecting rod, and a rotating connecting through hole is provided at the end of the first connecting rod away from the rotating rod. The rotating rod is driven to rotate by the first connecting rod during the up and down movement of the lifting frame.

[0010] Furthermore, an inclined surface is provided on one side of the lower end surface of the floating plate, and the inclined surface is inclined upward toward the direction of the water flow inlet in the installation pipe.

[0011] Furthermore, a display component is fixedly installed above the lifting frame, and the display component is used to display the horizontal height of the floating board.

[0012] Furthermore, the display assembly includes a lifting rod fixedly installed above the lifting frame and extending upward from the connecting box, the outer peripheral surface of the lifting rod is provided with a spiral guide groove, the outer side of the lifting rod is sleeved with a rotating cylinder, the bottom of the rotating cylinder is rotatably connected to the upper end surface of the connecting box through a plane bearing, and the inner wall of the rotating cylinder is fixedly installed with a limiting ball for sliding inside the spiral guide groove.

[0013] Furthermore, an indicator plate for displaying the rotation position of the rotating cylinder is fixedly installed on one side of the rotating cylinder, and the lifting rod drives the rotating cylinder to rotate to different angles by moving up and down. A display panel is fixedly installed on the upper end surface of the connecting box along the outer side of the rotating cylinder, and scale lines are set on the display panel.

[0014] Furthermore, a push-type alarm is fixedly installed on the top of the lifting rod, and the push-type alarm is used to sound an alarm when the lifting rod descends to the lowest point.

[0015] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects: 1. The present invention arranges an emptying component on one side of the water inlet pipe of the pump body. When the water flow and air are delivered to the connecting box, the lighter air will be squeezed under the sealing plate inside the connecting box. Then, as the sliding piston moves up and down, negative pressure is generated inside the negative pressure box, so that the air under the sealing plate is squeezed through the air filter membrane, and the air sucked into the water flow delivery pipe is released before entering the pump body, thereby preventing the air in the water flow from entering the impeller of the pump body, preventing the formation and rupture of bubbles in the centrifugal process, releasing a large amount of energy to damage the impeller of the pump body, and avoiding excessive noise.

[0016] 2. In the present invention, a floating plate is provided below the sealing plate. When air is collected below the sealing plate, the floating plate moves downward under the action of gravity, driving the lifting frame to move downward. When the lifting frame moves downward, it drives one end of the rotating frame to move downward, causing the other end of the rotating frame to tilt upward. At this time, the tilted end of the rotating frame drives the sliding piston located inside the negative pressure barrel to move upward, thereby generating negative pressure inside the negative pressure box, and quickly sucking the air below the sealing plate into the negative pressure box.

[0017] 3. In the present invention, an inclined surface is provided below the floating plate so that the inclined surface faces the flow direction of the water flow, so that the water flowing in the installation pipe can exert an inclined upward thrust on the floating plate, which can make the floating plate float more easily. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the internal structure of the pipeline of the present invention; Figure 3 It is a side view of the internal structure of the pipeline of the present invention; Figure 4 It is a schematic diagram of the installation structure of the lifting frame of the present invention; Figure 5 It is a schematic diagram of the overall structure of the rotating frame of the present invention; Figure 6 It is a schematic diagram of the internal structure of the negative pressure barrel and the negative pressure box of the present invention; Figure 7 It is a schematic diagram of the bottom structure of the sealing plate of the present invention; Figure 8It is a schematic structural diagram of the display assembly of the present invention.

[0020] The numbers in the figure represent: 1. Pump body; 2. Drive motor; 3. Emptying assembly; 31. Installation pipeline; 32. Connecting box; 33. Rotating frame; 3301. Support through hole; 331. Rotating rod; 332. First connecting rod; 333. Second connecting rod; 34. Negative pressure box; 3401. Negative pressure chamber; 341. Air filter membrane; 35. Negative pressure barrel; 351. Sliding piston; 36. Floating plate; 361. Inclined surface; 37. Lifting frame; 38. Display assembly; 3801. Spiral guide groove; 381. Lifting rod; 382. Rotating cylinder; 383. Limiting ball; 384. Display panel; 385. Indicator board; 386. Push-type alarm; 39. Sealing plate. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are 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.

[0022] The present invention will be further described below in conjunction with the embodiments.

[0023] To this end, an embodiment of the present invention provides a double-suction centrifugal pump, whose purpose is at least to drive the sliding piston 351 to slide up and down inside the negative pressure barrel 35 through the up and down movement of the floating plate 36, so as to generate negative pressure inside the negative pressure box 34, absorb the air under the sealing plate 39 into the negative pressure box 34, and reduce the air entering the pump body 1.

[0024] Example: A double suction centrifugal pump, such as Figure 1 - Figure 4 As shown, it includes a pump body 1 and a driving motor 2 fixed to the side of the pump body 1 for driving the pump body 1 to operate; The emptying assembly 3 is installed on one side of the water inlet pipe of the pump body 1 and is connected to the water inlet pipe, and is used to empty the air inside the water inlet pipe; The emptying assembly 3 includes an installation pipe 31 connected to the water inlet pipe of the pump body 1, a connecting box 32 is connected to the top of the installation pipe 31, a sealing plate 39 is fixedly installed in the middle of the connecting box 32, the horizontal height of the sealing plate 39 is higher than the top height of the installation pipe 31, a negative pressure box 34 is fixedly installed on the sealing plate 39, the negative pressure box 34 is connected to the space below the sealing plate 39, an air filter membrane 341 (for example, a polytetrafluoroethylene (PTFE) filter membrane or a polyvinylidene fluoride (PVDF) filter membrane) for filtering air is fixedly installed inside the negative pressure box 34, a negative pressure barrel 35 connected to the negative pressure box 34 is fixedly installed on the top of the negative pressure box 34, the air filter membrane 341, the negative pressure barrel 35 and the negative pressure box 34 together form a negative pressure chamber 3401, and a sliding piston 351 for creating a negative pressure environment is slidably installed up and down inside the negative pressure barrel 35; The rotating frame 33 is used to drive the sliding piston 351 to move up and down.

[0025] In the present invention, an emptying assembly 3 is provided on one side of the water inlet pipe of the pump body 1. When the water flow and air are delivered to the connecting box 32, the lighter air will be squeezed to the bottom of the sealing plate 39 inside the connecting box 32. Then, as the sliding piston 351 moves up and down, a negative pressure is generated inside the negative pressure box 34, so that the air below the sealing plate 39 is squeezed through the air filter membrane 341, so that the air sucked into the water flow delivery pipe is released before entering the pump body 1, thereby preventing the air in the water flow from entering the impeller of the pump body 1, preventing the formation and rupture of bubbles during the centrifugation process to release a large amount of energy to damage the impeller of the pump body 1, and avoiding excessive noise.

[0026] Furthermore, if Figure 3 and Figure 4 As shown, a lifting frame 37 is installed above the sealing plate 39 for lifting. The lower end of the lifting frame 37 seals downward through the sealing plate 39. A floating plate 36 is fixedly installed at the bottom of the lifting frame 37. The floating plate 36 is used to float inside the installation pipe 31 to drive the lifting frame 37 to move up and down. The upper end of the lifting frame 37 is used to drive the rotating frame 33 to rotate.

[0027] Among them, by setting a floating plate 36 under the sealing plate 39, when air is collected under the sealing plate 39, the floating plate 36 moves downward under the action of gravity, which will drive the lifting frame 37 to move downward. When the lifting frame 37 moves downward, it will drive one end of the rotating frame 33 to move downward, so that the other end of the rotating frame 33 will tilt upward. At this time, the upwardly tilted end of the rotating frame 33 will drive the sliding piston 351 located inside the negative pressure barrel 35 (the top of the negative pressure barrel 35 is sealed, and the bottom of the negative pressure barrel 35 is connected to the inside of the negative pressure box 34) to move upward, so that negative pressure is generated inside the negative pressure box 34, and the air below the sealing plate 39 is quickly sucked into the inside of the negative pressure box 34.

[0028] Furthermore, if Figure 4 and Figure 5 As shown, the rotating frame 33 includes a rotating rod 331 rotatably installed inside the connecting box 32, and a first connecting rod 332 and a second connecting rod 333 are fixedly installed on both sides of the rotating rod 331. The first connecting rod 332 and the second connecting rod 333 are respectively rotatably and slidably connected to the lifting frame 37 and the top of the sliding piston 351.

[0029] By respectively arranging the first connecting rod 332 and the second connecting rod 333 on both sides of the rotating rod 331 , the sliding piston 351 can be driven to move up and down more stably through the second connecting rod 333 .

[0030] Furthermore, if Figure 5 As shown, the end of the second connecting rod 333 away from the rotating rod 331 is provided with a long strip-shaped supporting through hole 3301, and the connecting rod on the top of the sliding piston 351 passes through the supporting through hole 3301 and is rotatably and slidably connected with the inner wall of the supporting through hole 3301.

[0031] Furthermore, if Figure 5 As shown, the length of the first connecting rod 332 is greater than that of the second connecting rod 333 , and a rotating connecting through hole is provided at the end of the first connecting rod 332 away from the rotating rod 331 . The rotating rod 331 is driven to rotate by the first connecting rod 332 during the up and down movement of the lifting frame 37 .

[0032] By making the length of the first connecting rod 332 greater than that of the second connecting rod 333, the first connecting rod 332 can use easier force to drive the second connecting rod 333 to move up and down away from the end of the rotating rod 331, thereby more easily driving the sliding piston 351 to move up and down.

[0033] Furthermore, if Figure 3 As shown, an inclined surface 361 is provided on one side of the lower end surface of the floating plate 36 , and the inclined surface 361 is inclined upward toward the water flow inlet direction in the installation pipe 31 .

[0034] By setting an inclined surface 361 below the floating plate 36 so that the inclined surface 361 faces the flow direction of the water, the water flowing in the installation pipe 31 can exert an inclined upward thrust on the floating plate 36, making the floating plate 36 float more easily.

[0035] Furthermore, if Figure 6 and Figure 7 As shown, a display assembly 38 is fixedly installed above the lifting frame 37 , and the display assembly 38 is used to display the horizontal height of the floating plate 36 .

[0036] Furthermore, if Figure 7 and Figure 8 As shown, the display assembly 38 includes a lifting rod 381 fixedly installed above the lifting frame 37 and extending upward from the connecting box 32. The outer peripheral surface of the lifting rod 381 is provided with a spiral guide groove 3801. The outer side of the lifting rod 381 is sleeved with a rotating cylinder 382. The bottom of the rotating cylinder 382 is rotatably connected to the upper end surface of the connecting box 32 through a plane bearing. The inner wall of the rotating cylinder 382 is fixedly installed with a limiting ball 383 for sliding inside the spiral guide groove 3801.

[0037] Among them, by arranging a lifting rod 381 above the lifting frame 37, the lifting rod 381 can be synchronously driven to move up and down during the up and down movement of the lifting frame 37. By arranging a rotating cylinder 382 on the outside of the lifting rod 381, when the lifting rod 381 is located at different heights, the rotating cylinder 382 can be rotated to different positions, so that the staff can more intuitively understand the situation of the floating plate 36 inside the installation pipe 31, and can better judge the water flow situation inside the installation pipe 31 (containing more or less air).

[0038] It should be noted that the center of gravity of the lifting frame 37, the center of gravity of the floating plate 36 and the center of gravity of the lifting rod 381 are on the same vertical line, so that the dead weight of the lifting frame 37 and the dead weight of the lifting rod 381 both act on the floating plate 36, so that when the water level under the floating plate 36 drops, the lifting frame 37, the floating plate 36 and the lifting rod 381 can be dropped in time.

[0039] Furthermore, if Figure 8 As shown, an indicator plate 385 for displaying the rotation position of the rotating cylinder 382 is fixedly installed on one side of the rotating cylinder 382, ​​and the lifting rod 381 drives the rotating cylinder 382 to rotate to different angles by moving up and down. A display disk 384 is fixedly installed on the upper end surface of the connecting box 32 along the outer side of the rotating cylinder 382, ​​and scale lines are set on the display disk 384.

[0040] Among them, by setting an indicator plate 385 on the side of the rotating cylinder 382 and setting a display panel 384 on the connecting box 32, the indicator plate 385 can point to different scales when the rotating cylinder 382 is rotated to different angles, so that the staff can more accurately identify the air content inside the installation pipeline 31 and check the delivery pipeline in time according to the situation.

[0041] Furthermore, if Figure 8As shown, a push-type alarm 386 is fixedly installed on the top of the lifting rod 381. The push-type alarm 386 is used to sound an alarm when the lifting rod 381 drops to the lowest point. When there is too much air inside the installation pipeline 31, it can promptly remind the staff to inspect the entire conveying pipeline to avoid continuous entry of air into the centrifugal pump, which may cause damage to the pump body 1 and the impeller.

[0042] It should be noted that this solution is aimed at the use case where there is a small amount of air in the water flow, such as when there is a large amount of air inside the installation pipe 31, and triggers an alarm to remind the staff to check the interface and the pipe mouth of the delivery pipe.

[0043] Working principle: During use, the installation pipe 31 is first fixedly installed at the water inlet pipe of the pump body 1, and the pipe for conveying water flow is connected to the installation pipe 31 and installed. Then, as the pump body 1 works, the water flow is driven into the installation pipe 31. When the installation pipe 31 is full of water, the float plate 36 moves to the highest point under the action of buoyancy. At this time, the float plate 36 drives the lifting frame 37 and the lifting rod 381 above to move to the highest point. When there is a small amount of air in the installation pipe 31, the float plate 36 will move downward at this time, driving the lifting frame 37 to move downward, so that the lifting frame 37 drives one end of the rotating frame 33 to move downward, and the other end of the rotating frame 33 is tilted upward, and then the other end of the rotating frame 33 drives the sliding piston 351 to move upward, so that a negative pressure environment is generated inside the negative pressure barrel 35 and the negative pressure box 34, and the air below the sealing plate 39 can be squeezed into the negative pressure box 34 above the sealing plate 39, so as to achieve the purpose of discharging the air inside the installation pipe 31.

[0044] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-suction centrifugal pump, characterized in that: include: A pump body (1) and a drive motor (2) fixed to a side of the pump body (1) and used to drive the pump body (1) to operate; An exhaust assembly (3) is mounted on one side of the water inlet pipe of the pump body (1) and is connected to the water inlet pipe, and is used to exhaust the air inside the water inlet pipe; The emptying assembly (3) comprises an installation pipe (31) connected to the water inlet pipe of the pump body (1); a connecting box (32) is arranged above the installation pipe (31); a sealing plate (39) is fixedly installed in the middle of the connecting box (32); the sealing plate (39) is at a higher level than the top of the installation pipe (31); a negative pressure box (34) is fixedly installed on the sealing plate (39); the negative pressure box (34) is connected to the space below the sealing plate (39); an air filter membrane (341) for filtering air is fixedly installed inside the negative pressure box (34); a negative pressure barrel (35) connected to the negative pressure box (34) is fixedly installed on the top of the negative pressure box (34); a sliding piston (351) for creating a negative pressure environment is slidably installed inside the negative pressure barrel (35); The rotating frame (33) is used to drive the sliding piston (351) to move up and down.

2. A double-suction centrifugal pump according to claim 1, characterized in that: A lifting frame (37) is installed above the sealing plate (39) for lifting, and the lower end of the lifting frame (37) seals downward through the sealing plate (39). A floating plate (36) is fixedly installed at the bottom of the lifting frame (37). The floating plate (36) is used to float inside the installation pipe (31) to drive the lifting frame (37) to move up and down, and the upper end of the lifting frame (37) is used to drive the rotating frame (33) to rotate.

3. A double-suction centrifugal pump according to claim 2, characterized in that: The rotating frame (33) comprises a rotating rod (331) rotatably mounted inside the connecting box (32), a first connecting rod (332) and a second connecting rod (333) being fixedly mounted on both sides of the rotating rod (331), and the first connecting rod (332) and the second connecting rod (333) are respectively rotatably and slidably connected to the lifting frame (37) and the top of the sliding piston (351).

4. A double-suction centrifugal pump according to claim 3, characterized in that: An elongated supporting through hole (3301) is provided at the end of the second connecting rod (333) away from the rotating rod (331), and the connecting rod at the top of the sliding piston (351) passes through the supporting through hole (3301) and is rotatably and slidably connected to the inner wall of the supporting through hole (3301).

5. A double-suction centrifugal pump according to claim 4, characterized in that: The length of the first connecting rod (332) is greater than that of the second connecting rod (333); an end of the first connecting rod (332) away from the rotating rod (331) is provided with a rotating connection through hole; and the rotating rod (331) is driven to rotate by the first connecting rod (332) during the upward and downward movement of the lifting frame (37).

6. A double-suction centrifugal pump according to claim 5, characterized in that: An inclined surface (361) is provided on one side of the lower end surface of the floating plate (36), and the inclined surface (361) is arranged to be inclined upwards towards the direction of the water flow inlet in the installation pipe (31).

7. A double-suction centrifugal pump according to claim 6, characterized in that: A display assembly (38) is fixedly mounted above the lifting frame (37), and the display assembly (38) is used to display the horizontal height of the floating plate (36).

8. A double-suction centrifugal pump according to claim 7, characterized in that: The display assembly (38) comprises a lifting rod (381) fixedly mounted above the lifting frame (37) and extending upwardly out of the connecting box (32); the outer peripheral surface of the lifting rod (381) is provided with a spiral guide groove (3801); the outer side of the lifting rod (381) is sleeved with a rotating cylinder (382); the bottom of the rotating cylinder (382) is rotatably connected to the upper end surface of the connecting box (32) via a plane bearing; and a limiting ball (383) for sliding inside the spiral guide groove (3801) is fixedly mounted on the inner wall of the rotating cylinder (382).

9. A double-suction centrifugal pump according to claim 8, characterized in that: An indicator plate (385) for displaying the rotation position of the rotating cylinder (382) is fixedly mounted on one side of the rotating cylinder (382); the lifting rod (381) drives the rotating cylinder (382) to rotate to different angles by moving up and down; a display plate (384) is fixedly mounted on the upper end surface of the connecting box (32) along the outer side of the rotating cylinder (382); and scale lines are provided on the display plate (384).

10. A double-suction centrifugal pump according to claim 9, characterized in that: A push-type alarm (386) is fixedly mounted on the top of the lifting rod (381), and the push-type alarm (386) is used to sound an alarm when the lifting rod (381) descends to the lowest point.

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