Leakage-proof centrifugal pump

Abstract

The utility model discloses an anti-leakage centrifugal pump which comprises a pump body, a pump shell is installed at the end of the pump body, a water inlet pipe is installed on one side of the pump shell, meanwhile, a water conveying pipe is installed on the top of the pump shell, and backflow pressure reduction is conducted between the water inlet pipe and the water conveying pipe on the pump body through a backflow pressure reduction assembly. The backflow pressure reduction assembly is composed of a backflow pipe, a branch pipe, a backflow valve, a connecting pipe and a connecting assembly, the end of the backflow pipe and the branch pipe are welded and fixed, meanwhile, the backflow valve is installed on the backflow pipe in a threaded connection mode, and the end of the backflow valve and the connecting pipe are fixed in a threaded connection mode. According to the water leakage prevention centrifugal pump, when the internal pressure of the water conveying pipe is too large, a medium can enter the backflow pipe at the moment and flow back to the interior of the expansion part through the backflow valve, the water conveying pressure of the water conveying pipe can be reduced through the backflow pipe, pressure relief is conducted on the interior of the pump shell, and the situations of leakage and leakage caused by pressure building in the pump shell are avoided.

Description

Technical Field

[0001] The utility model relates to the field of centrifugal pumps, in particular to a water-leakage-proof centrifugal pump. Background Art

[0002] A centrifugal pump works by using the rotation of the impeller to cause water to move centrifugally. Before starting the pump, the pump casing and the suction pipe must be filled with water, and then the motor is started so that the pump shaft drives the impeller and water to rotate at high speed. The water moves centrifugally and is thrown to the outer edge of the impeller, flowing into the water pressure pipeline of the pump through the flow channel of the volute pump casing.

[0003] In the prior art, when a centrifugal pump is transporting liquid, it often happens that the outlet flow rate of the centrifugal pump is less than the inlet flow rate, resulting in pressure build-up inside the centrifugal pump, causing leakage at various connections of the centrifugal pump. Utility Model Content

[0004] The purpose of the utility model is to provide a water-leakage-proof centrifugal pump to solve the defects mentioned in the above background technology.

[0005] To achieve the above object, a water-leakage-proof centrifugal pump is provided, comprising a pump body, a pump casing is installed at the end of the pump body, a water inlet pipe is installed on one side of the pump casing, and a water delivery pipe is installed on the top of the pump casing. The water inlet pipe and the water delivery pipe on the pump body are refluxed and depressurized through a reflux pressure reduction assembly, the reflux pressure reduction assembly is composed of a reflux pipe, a branch pipe, a reflux valve, a connecting pipe and a connecting assembly, and the end of the reflux pipe is welded and fixed to the branch pipe, and the reflux valve is screwed and installed on the reflux pipe, and the end of the reflux valve is screwed and fixed to the connecting pipe;

[0006] Connecting components are installed at the ends of the connecting pipe and the branch pipe, and the connecting pipe is screwed and installed with the water inlet pipe through the connecting component. At the same time, the branch pipe is screwed and installed with the water delivery pipe through the connecting component. The connecting component consists of a positioning piece, bolts and a sealing gasket, and the end of the connecting pipe is welded and fixed to the positioning piece. At the same time, the positioning piece covers the surface of the water inlet pipe and is screwed and fixed through four sets of bolts.

[0007] Preferably, an expansion portion is provided at the bottom of the water inlet pipe, and the cross-section of the expansion portion is "C"-shaped, and the expansion portion is arranged opposite to the connecting pipe.

[0008] Preferably, the positioning piece is an arc-shaped structure made of metal material, and the positioning piece covers the outside of the water inlet pipe. At the same time, the curvature of the positioning piece is consistent with the surface curvature of the water inlet pipe, and the positioning piece is screwed to the surface of the water inlet pipe and sealed by a sealing gasket.

[0009] Preferably, the reflux valve is composed of a reflux cylinder, a connecting pipe, a sealing seat, a flow port, a hollow ball, an arc groove, a guide cylinder, a guide seat, a spring and a connecting seat, and the sealing seat is fixedly installed inside the reflux cylinder, and a flow port is opened in the middle of the sealing seat, and a hollow ball is movably installed inside the flow port.

[0010] Preferably, an arc groove is provided on the surface of the hollow ball, and the end of the hollow ball is fixed to the guide cylinder, while the guide cylinder is movably inserted into the inside of the guide seat, and the guide seat and the guide cylinder are connected by a spring.

[0011] Preferably, the bottom of the guide seat is fixed to the connecting seat, and the two side ends of the connecting seat are fixedly connected to the inner wall of the reflux cylinder, and holes are opened on the connecting seat.

[0012] Compared with the prior art, the utility model has the following beneficial effects: when the internal pressure of the water pipe is too high, the medium can enter the interior of the reflux pipe and flow back to the interior of the expansion part through the reflux valve. The reflux pipe can be used to reduce the water pressure of the water pipe and relieve the pressure inside the pump casing, thereby avoiding pressure build-up inside the pump casing and causing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a schematic diagram of the installation structure of the structural connection assembly of the utility model;

[0015] Figure 3 This is a schematic diagram of the structural reflux valve of the utility model;

[0016] Figure 4 This is a schematic diagram of the axial cross-section structure of the reflux cylinder of the utility model.

[0017] Numbers in the figure: 1. Pump body; 2. Pump casing; 3. Water inlet pipe; 31. Expansion part; 4. Water delivery pipe; 5. Reflux pressure reducing assembly; 51. Reflux pipe; 52. Branch pipe; 53. Reflux valve; 530. Reflux cylinder; 531. Connecting pipe; 532. Sealing seat; 533. Flow port; 534. Hollow ball; 535. Arc groove; 536. Guide cylinder; 537. Guide seat; 538. Spring; 539. Connecting seat; 54. Connecting pipe; 55. Connecting assembly; 551. Positioning piece; 552. Bolt; 553. Sealing gasket. DETAILED DESCRIPTION

[0018] See also Figure 1-4The utility model provides a water-leakage-proof centrifugal pump, comprising a pump body 1, a pump casing 2 is installed at the end of the pump body 1, and a water inlet pipe 3 is installed on one side of the pump casing 2, and a water delivery pipe 4 is installed on the top of the pump casing 2. The water inlet pipe 3 and the water delivery pipe 4 on the pump body 1 are refluxed and depressurized through a reflux pressure reduction assembly 5, and the reflux pressure reduction assembly 5 is composed of a reflux pipe 51, a branch pipe 52, a reflux valve 53, a connecting pipe 54 and a connecting assembly 55, and the end of the reflux pipe 51 is welded and fixed to the branch pipe 52, and the reflux valve 53 is screwed and installed on the reflux pipe 51, and the end of the reflux valve 53 is screwed and fixed to the connecting pipe 54;

[0019] The ends of the connecting pipe 54 and the branch pipe 52 are both installed with connecting components 55, and the connecting pipe 54 is screwed and installed with the water inlet pipe 3 through the connecting component 55, and the branch pipe 52 is screwed and installed with the water pipe 4 through the connecting component 55. The connecting component 55 consists of a positioning piece 551, a bolt 552 and a sealing gasket 553, and the end of the connecting pipe 54 is welded and fixed to the positioning piece 551, and the positioning piece 551 covers the surface of the water inlet pipe 3 and is screwed and fixed by four sets of bolts 552.

[0020] Working principle: When in use, the medium enters the interior of the pump casing 2 from the water inlet pipe 3, and is discharged through the water pipe 4 under the centrifugal action of the impeller. When the internal pressure of the water pipe 4 is too high, the medium can enter the interior of the reflux pipe 51, and flow back to the interior of the expansion part 31 through the reflux valve 53. The reflux pipe 51 can be used to reduce the water delivery pressure of the water pipe 4, relieve the pressure inside the pump casing 2, and avoid the pressure build-up inside the pump casing 2, which may cause leakage.

[0021] As a preferred embodiment, an expansion portion 31 is provided at the bottom of the water inlet pipe 3 , and the cross-section of the expansion portion 31 is “C”-shaped, and the expansion portion 31 is arranged opposite to the connecting pipe 54 .

[0022] like Figure 1-3 As shown: the setting of the reflux pressure reduction component 5 forms a pressure relief work when the water delivery pipe 4 is discharging water, thereby realizing the pressure reduction work inside the centrifugal pump, which can avoid the centrifugal pump from leaking due to excessive internal pressure of the centrifugal pump.

[0023] As a preferred embodiment, the positioning piece 551 is an arc-shaped structure made of metal material, and the positioning piece 551 covers the outer side of the water inlet pipe 3. At the same time, the curvature of the positioning piece 551 is consistent with the surface curvature of the water inlet pipe 3, and the positioning piece 551 is screwed to the surface of the water inlet pipe 3 and sealed by the sealing gasket 553.

[0024] like Figure 1-2As shown: the curvature of the positioning piece 551 is consistent with the surface curvature of the water inlet pipe 3, the positioning piece 551 covers the surface of the water inlet pipe 3, and is screwed and fixed by four sets of bolts 552, so as to fix the reflux pressure reduction assembly 5 between the water inlet pipe 3 and the water delivery pipe 4.

[0025] As a preferred embodiment, the reflux valve 53 is composed of a reflux cylinder 530, a connecting pipe 531, a sealing seat 532, a flow port 533, a hollow ball 534, an arc groove 535, a guide cylinder 536, a guide seat 537, a spring 538 and a connecting seat 539, and the sealing seat 532 is fixedly installed inside the reflux cylinder 530, and the flow port 533 is opened in the middle of the sealing seat 532, and the hollow ball 34 is movably installed inside the flow port 533.

[0026] like Figure 1-4 As shown: the setting of the reflux valve 53 can limit the flow direction inside the connecting pipe 54 so that the water flow inside the connecting pipe 54 can only move from bottom to top.

[0027] As a preferred embodiment, an arc groove 535 is opened on the surface of the hollow ball 534, and the end of the hollow ball 534 is fixed to the guide tube 536. At the same time, the guide tube 536 is movably inserted into the inside of the guide seat 537, and the guide seat 537 and the guide tube 536 are connected by a spring 538.

[0028] like Figure 3 As shown: when the reflux valve 53 is in use, water flows from the water pipe 4 into the interior of the reflux pipe 51, the water flows impacting the arc groove 535, and overcomes the elasticity of the spring 538, so that the hollow ball 534 is separated from the bottom of the flow port 533, so that the water flows from the flow port 533 into the interior of the connecting pipe 54, and merges with the liquid inside the water inlet pipe 3, thereby reducing the water outlet pressure of the water pipe 4 and avoiding pressure buildup inside the centrifugal pump.

[0029] As a preferred embodiment, the bottom of the guide seat 537 is fixed to the connecting seat 539 , and the two side ends of the connecting seat 539 are fixedly connected to the inner wall of the reflux tube 530 , and holes are opened on the connecting seat 539 .

Claims

1. A water-leakage-proof centrifugal pump, comprising a pump body (1), a pump casing (2) being mounted at the end of the pump body (1), a water inlet pipe (3) being mounted on one side of the pump casing (2), and a water delivery pipe (4) being mounted on the top of the pump casing (2), characterized in that: The water inlet pipe (3) and the water delivery pipe (4) on the pump body (1) are connected to each other through a reflux pressure reduction assembly (5), the reflux pressure reduction assembly (5) is composed of a reflux pipe (51), a branch pipe (52), a reflux valve (53), a connecting pipe (54) and a connecting assembly (55), and the end of the reflux pipe (51) is fixed to the branch pipe (52) by welding, and the reflux valve (53) is screwed on the reflux pipe (51), and the end of the reflux valve (53) is screwed to the connecting pipe (54); The ends of the connecting pipe (54) and the branch pipe (52) are both installed with a connecting assembly (55), and the connecting pipe (54) is screwed and installed with the water inlet pipe (3) through the connecting assembly (55), and the branch pipe (52) is screwed and installed with the water delivery pipe (4) through the connecting assembly (55). The connecting assembly (55) is composed of a positioning piece (551), a bolt (552) and a sealing gasket (553), and the end of the connecting pipe (54) is fixed to the positioning piece (551) by welding, and the positioning piece (551) covers the surface of the water inlet pipe (3) and is screwed and fixed by four groups of bolts (552).

2. A water-leakage-proof centrifugal pump according to claim 1, characterized in that: An expansion portion (31) is provided at the bottom of the water inlet pipe (3), and the cross-section of the expansion portion (31) is arranged in a "C" shape. At the same time, the expansion portion (31) and the connecting pipe (54) are arranged opposite to each other.

3. A water-leakage-proof centrifugal pump according to claim 1, characterized in that: The positioning piece (551) is an arc-shaped structure made of metal material, and the positioning piece (551) covers the outer side of the water inlet pipe (3). At the same time, the curvature of the positioning piece (551) is consistent with the curvature of the surface of the water inlet pipe (3), and the positioning piece (551) is screwed to the surface of the water inlet pipe (3) and sealed by a sealing gasket (553).

4. A water-leakage-proof centrifugal pump according to claim 1, characterized in that: The reflux valve (53) is composed of a reflux cylinder (530), a connecting pipe (531), a sealing seat (532), a flow port (533), a hollow ball (534), an arc groove (535), a guide cylinder (536), a guide seat (537), a spring (538) and a connecting seat (539), and the sealing seat (532) is fixedly installed inside the reflux cylinder (530), and the flow port (533) is opened in the middle of the sealing seat (532), and the hollow ball (534) is movably installed inside the flow port (533).

5. A water-leakage-proof centrifugal pump according to claim 4, characterized in that: An arc groove (535) is provided on the surface of the hollow ball (534), and the end of the hollow ball (534) is fixed to the guide tube (536). Meanwhile, the guide tube (536) is movably inserted into the inside of the guide seat (537), and the guide seat (537) and the guide tube (536) are connected via a spring (538).

6. A water-leakage-proof centrifugal pump according to claim 4, characterized in that: The bottom of the guide seat (537) is fixed to the connecting seat (539), and the two side ends of the connecting seat (539) are fixedly connected to the inner wall of the reflux cylinder (530), and holes are opened on the connecting seat (539).

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