High-sealing-performance non-variable-capacity pump and components thereof

Abstract

The invention relates to the technical field of centrifugal pumps, and particularly discloses a high-leakproofness non-variable-capacity pump and a component thereof, the high-leakproofness non-variable-capacity pump comprises a pump shell and an impeller, the pump shell is provided with a water inlet and a water outlet, the pump shell is in a volute shape, the volute shape comprises a wide section and a narrow section, and the high-leakproofness non-variable-capacity pump further comprises a flow aiding mechanism; the flow dividing device comprises a flow dividing opening and a flow dividing sleeve which are formed in the narrow section of the pump shell, a plurality of liquid inlet holes are formed in the water inlet in a circumferential array mode, and the flow dividing opening and the liquid inlet holes are covered with the two ends of the flow dividing sleeve respectively. According to the centrifugal pump, in the operation process of the impeller, fluid is guided to enter the flow dividing sleeve along the flow dividing opening at the volute-shaped narrow section with the maximum pressure through the flow dividing sleeve, then the flow dividing sleeve supplements the fluid to the water inlet of the pump shell, the negative pressure at the water inlet is supplemented, the cavitation condition is relieved, and the service life of the whole centrifugal pump is prolonged.

Description

Technical Field

[0001] The present invention relates to centrifugal pump technology, in particular to a high-sealing non-variable displacement pump and components thereof. Background Art

[0002] As is known to all, non-variable displacement pumps are non-positive displacement pumps, also known as dynamic pumps. This type of pump does not rely on the volume change of a closed working chamber to transport fluid, but transports fluid through a high-speed rotating impeller. Centrifugal pumps are non-variable displacement pumps.

[0003] For example, the invention patent application with the publication number CN116104764A and the publication date of May 12, 2023, entitled "A Centrifugal Pump," comprises: a pump casing and an impeller mounted in the pump casing, the impeller comprising n blades, with an impeller flow channel formed between adjacent blades, a volute flow channel with a rectangular cross-section provided on the inner periphery of the pump casing, an annular guide ring provided between the inner ring of the volute flow channel and the outer diameter of the impeller, the annular guide ring comprising m guide blades, with a guide flow channel formed between adjacent guide blades; n and m are both positive integers. The centrifugal pump of the present invention has the advantages of compact structure, easy installation, high reliability, and low kinetic energy loss, and can greatly reduce the vortex formed in the flow channel of the pump, thereby significantly improving the overall efficiency of the pump.

[0004] The shortcoming of the existing technology is that the centrifugal pump throws the fluid to the edge through the high-speed rotation of the impeller, creating negative pressure in the center for suction. However, when the suction height of the centrifugal pump is large and the diameter is increased (that is, when the required negative pressure is increased), cavitation is likely to occur, resulting in a significant reduction in the service life of the pump casing. Summary of the Invention

[0005] The object of the present invention is to provide a highly sealed non-variable displacement pump and components thereof to address the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a highly sealed non-variable displacement pump, comprising a pump casing and an impeller, wherein the pump casing is respectively provided with a water inlet and a water outlet, the pump casing being a volute type, the volute type comprising a wide section and a narrow section, and further comprising a flow-aiding mechanism, comprising a diverter port and a diverter sleeve provided on the narrow section of the pump casing, a plurality of liquid inlet holes being provided in a circumferential array on the water inlet, and the two ends of the diverter sleeve respectively covering the diverter port and the liquid inlet hole.

[0007] As a further description of the above technical solution, a centralizing ring is provided on the inner wall of the water inlet, and the liquid inlet hole corresponds to the centralizing ring.

[0008] As a further description of the above technical solution, a liquid flow groove is provided on the diversion sleeve, and the liquid flow groove is connected with the liquid inlet and the diversion port.

[0009] As a further description of the above technical solution, a sealing plate is provided on one side of the pump casing, a side flow channel is formed between the impeller and the sealing plate, and a through groove connected to the side flow channel is opened on the impeller.

[0010] As a further description of the above technical solution, the pump casing is in a volute shape, and an inner annular groove is provided on the inner wall of the volute, and the inner annular groove limits the fluid.

[0011] As a further description of the above technical solution, a movable baffle for shielding the through slot is slidably connected to the impeller, and the movable baffle moves as the impeller accelerates its rotation.

[0012] As a further description of the above technical solution, the movable baffle includes a shielding plate slidably connected to the impeller, an extension rod is provided on the shielding plate, and a spring is provided between the extension rod and the through groove.

[0013] As a further description of the above technical solution, a slider is provided on the extension rod, and the slider is slidably connected to a sliding groove provided on the impeller.

[0014] A high-sealing non-variable displacement pump component further comprises an extension ring arranged on the impeller, a sealing ring is slidably connected to the extension ring, and the sealing ring is driven to approach the sealing plate.

[0015] As a further description of the above technical solution, a push ring is slidably connected to the extension ring, and a slope is provided on the push ring. The movable baffle is driven to move and push against the slope, so that the push ring approaches the sealing ring.

[0016] In the above technical solution, the present invention provides a highly sealed non-variable displacement pump and its components, which guide the fluid along the diverter port into the diverter sleeve at the narrow section of the volute where the pressure is the highest during the operation of the impeller through the diverter sleeve. The diverter sleeve then replenishes the fluid to the water inlet of the pump casing to replenish the negative pressure at the water inlet, thereby reducing cavitation and improving the overall service life of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0018] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention; Figure 2A schematic diagram of an exploded structure of a pump housing and a flow-assisting mechanism provided in an embodiment of the present invention; Figure 3 An exploded schematic diagram of a pump structure provided by an embodiment of the present invention; Figure 4 for Figure 3 A in the middle is an enlarged schematic diagram; Figure 5 A schematic structural diagram of a movable baffle provided in an embodiment of the present invention; Figure 6 A schematic cross-sectional view of the structure of a pump housing and a diversion port provided in an embodiment of the present invention; Figure 7 A schematic cross-sectional view of the overall structure provided by an embodiment of the present invention; Figure 8 for Figure 7 The enlarged schematic diagram of point B in the middle; Figure 9 for Figure 7 The enlarged schematic diagram of point C in the middle; Figure 10 for Figure 7 Enlarged schematic diagram at point D in the middle.

[0019] Description of reference numerals: 1. Pump casing; 10. Inner ring groove; 11. Water inlet; 111. Concentrating ring; 12. Water outlet; 13. Diverter port; 14. Impeller; 141. Extension ring; 142. Through groove; 143. Slide; 15. Sealing plate; 2. Flow-aiding mechanism; 21. Diverter sleeve; 211. Liquid flow groove; 22. Liquid inlet hole; 31. Movable baffle; 311. Slider; 321. Shielding plate; 313. Extension rod; 314. Spring; 32. Sealing ring; 33. Push ring; 331. Inclined surface. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. Example 1

[0021] See also Figure 1-10 An embodiment of the present invention provides a technical solution: a highly sealed non-variable displacement pump, comprising a pump casing 1 and an impeller 14, wherein a water inlet 11 and a water outlet 12 are respectively provided on the pump casing 1, the pump casing 1 is a volute type, the volute type comprises a wide section and a narrow section, and further comprises a flow-aiding mechanism 2, which comprises a diverter port 13 and a diverter sleeve 21 provided on the narrow section of the pump casing 1, a plurality of liquid inlet holes 22 are provided in a circumferential array on the water inlet 11, and the two ends of the diverter sleeve 21 are respectively covered with the diverter port 13 and the liquid inlet hole 22.

[0022] Specifically, the volute type is as follows Figure 1As shown, with the left end of the water outlet 12 of the pump casing 1 as the starting point, the diameter of the disc gradually increases. The water outlet 12 is opened at the center of the volute, and a diverter port 13 is opened on the narrow section of the volute. When the impeller 14 is driven to rotate, the rotating impeller 14 drives the fluid in the volute to be thrown out by centrifugal force, thereby forming a negative pressure in the center of the impeller 14. When the fluid is thrown to the narrow section, the narrow section guides the fluid to flow to the wide section and is discharged from the water outlet 12. The fluid in the narrow section is restricted, thereby increasing the pressure, and the negative pressure bubbles are more likely to cause cavitation when they reach the high-pressure position. The diverter port 13 guides the fluid in the narrowest section into the diverter sleeve 21 and into the liquid inlet hole 22 on the water inlet 11, diverting the high-pressure pressure and replenishing the water intake of the water inlet 11, reducing the negative pressure, so as to reduce the cavitation phenomenon and increase the service life of the pump casing 1.

[0023] Preferably, a liquid flow groove 211 is provided on the diverter sleeve 21, and the liquid flow groove 211 is connected to the liquid inlet 22 and the diverter port 13 for fluid flow. The diverter port 13 occupies 10% to 17% of the pump housing 1, and the diverter port 13 is opened on the central axis.

[0024] In the above scheme, during the operation of the diverter sleeve 21 in the impeller 14, the fluid is guided along the diverter port 13 into the diverter sleeve 21 at the narrow section of the volute where the pressure is the highest. Then the diverter sleeve 21 replenishes the fluid to the water inlet 11 of the pump casing 1 to replenish the negative pressure at the water inlet 11.

[0025] In an embodiment provided by the present invention, a centralizing ring 111 is provided on the inner wall of the water inlet 11 , and the liquid inlet hole 22 corresponds to the centralizing ring 111 .

[0026] Specifically, such as Figure 9 As shown, the diameter of the concentrating ring 111 is smaller than that of the water inlet 11, and the concentrating ring 111 is arc-shaped to guide the fluid to move toward the central axis of the water inlet 11, and the liquid inlet hole 22 corresponds to the concentrating ring 111. After the fluid entering the water inlet 11 enters the pump casing 1 along the concentrating ring 111, the fluid in the diverter sleeve 21 enters the water inlet 11 along the liquid inlet hole 22 and merges with the fluid, thereby replenishing the fluid while the original negative pressure of the liquid inlet remains unchanged, so as to alleviate the negative pressure of the fluid reaching the impeller 14 and alleviate the phenomenon of cavitation.

[0027] In another embodiment provided by the present invention, a sealing plate 15 is provided on one side of the pump housing 1, a side flow channel is formed between the impeller 14 and the sealing plate 15, and a through groove 142 connected to the side flow channel is opened on the impeller 14.

[0028] Specifically, a water inlet 11 and a sealing plate 15 are respectively provided on both sides of the pump casing 1. The sealing plate 15 is fixed to one side by screws, so that the pump casing 1 forms a cavity for fluid flow. There is a distance between the impeller 14 and the sealing plate 15, which is the side flow channel. When the impeller 14 rotates, the fluid at the center will enter the side flow channel in advance along the groove 142, thereby diverting the two streams of fluid being thrown out. After diversion, they are guided separately to reduce the fluid collision and reduce the pressure on the blades on the impeller 14, thereby alleviating the cavitation phenomenon. The other side of the impeller 14 does not have blades (that is, the side flow channel part), and the width of the side flow channel is 3mm~10mm, so that the fluid can be thrown out through friction and centrifugal force.

[0029] Preferably, the pump housing 1 is provided with an inner ring groove 10 along the inner wall of the volute. Figure 10 As shown, curved corners are provided at both ends of the inner annular groove 10. The inner annular groove 10 and the curved corners cooperate to restrict the fluid to the outside of the pump casing 1, so that the fluid flows along the inner annular groove 10 due to centrifugal force, and the side flow channel faces one of the curved corners, guiding the diverted fluid to converge in the inner annular groove 10, and then flow out along the water outlet 12 after convergence.

[0030] Preferably, a movable baffle 31 is slidably connected to the impeller 14 for blocking the through groove 142. The movable baffle 31 moves as the impeller 14 accelerates to expand the area of the through groove 142 to increase the amount entering the side flow channel. When the rotation speed of the impeller 14 has not reached the maximum, the through groove 142 is partially blocked by the movable baffle 31 to reduce the fluid entering the side flow channel. When the rotation speed of the impeller 14 increases to the maximum, the movable baffle 31 moves to expand the unblocked part of the through groove 142 to increase the fluid entering the side flow channel.

[0031] Preferably, the movable baffle 31 includes a baffle 321 slidably connected to the impeller 14, an extension rod 313 is provided on the baffle 321, the extension rod 313 is slidably connected in the through groove 142, and assists in supporting the baffle 321, a spring 314 is provided between the extension rod 313 and the through groove 142, a slider 311 is provided on the extension rod 313, the slider 311 is slidably connected to the slide groove 143 opened on the impeller 14, the slider 311 has a counterweight effect while sliding, and the spring 314 pushes the extension rod 313 to make the baffle 321 block the through groove 142.

[0032] When the centrifugal pump is running, the impeller 14 is driven to rotate, and the rotating impeller 14 drives the fluid in the volute to be thrown out by centrifugal force, thereby forming a negative pressure in the center of the impeller 14 to suck the fluid from the water inlet 11. At the same time, the narrowest section of the fluid is guided into the diverter sleeve 21 by the diverter port 13, and then guided into the liquid inlet hole 22 on the water inlet 11 to supplement the negative pressure at the water inlet 11. The other part of the liquid entering the impeller 14 will enter the side flow channel in advance along the groove 142. The two streams of liquid enter the inner annular groove 10 and flow out along the water outlet 12. When the rotation speed of the impeller 14 increases to the maximum, the movable baffle 31 moves to expand the unblocked part of the groove 142 to increase the fluid entering the side flow channel. Example 2

[0033] See also Figure 1-5 An embodiment of the present invention provides a technical solution: a highly sealing non-variable displacement pump component, further comprising an extension ring 141 arranged on the impeller 14, on which a sealing ring 32 is slidably connected, and the sealing ring 32 is driven to approach the sealing plate 15.

[0034] Specifically, the extension ring 141 is connected to the driving shaft of the centrifugal pump, and the sealing ring 32 is slidably connected to the extension ring 141. One side of the sealing ring 32 is a friction part, and the other side is a fitting part. The friction part is made of graphite, and the friction part fits the sealing plate 15 for friction sealing. The fitting part is made of a layer of polytetrafluoroethylene and a layer of rubber. One side of the polytetrafluoroethylene layer limits the extension ring 141 from rotating with the impeller 14.

[0035] In one embodiment of the present invention, a push ring 33 is slidably connected to the extension ring 141 . The push ring 33 has an inclined surface 331 . The movable baffle 31 is driven to move against the inclined surface 331 , so that the push ring 33 approaches the sealing ring 32 .

[0036] Specifically, an oblique angle is provided in the extension rod 313 on the movable baffle 31, and the oblique angle fits against the inclined surface 331. When the rotation speed increases, the moving extension rod 313 will push against the inclined surface 331. At this time, the pushing ring 33 pushes toward the sealing ring 32 to compress the rubber layer of the fitting part and increase the sealing performance of the sealing ring 32.

[0037] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A high-sealing non-variable displacement pump, comprising a pump casing (1) and an impeller (14), wherein the pump casing (1) is provided with a water inlet (11) and a water outlet (12), respectively; the pump casing (1) is a volute type, and the volute type comprises a wide section and a narrow section, and is characterized in that: It also includes a flow-assisting mechanism (2), which includes a diversion port (13) and a diversion sleeve (21) provided on the narrow section of the pump housing (1); a plurality of liquid inlet holes (22) are provided in a circumferential array on the water inlet (11); and two ends of the diversion sleeve (21) are respectively covered on the diversion port (13) and the liquid inlet holes (22).

2. A high sealing non-variable displacement pump according to claim 1, characterized in that: A centralizing ring (111) is provided on the inner wall of the water inlet (11), and the liquid inlet hole (22) corresponds to the centralizing ring (111).

3. A high sealing non-variable displacement pump according to claim 1, characterized in that: A liquid flow groove (211) is provided on the diversion sleeve (21), and the liquid flow groove (211) is connected to the liquid inlet hole (22) and the diversion port (13).

4. A high sealing non-variable displacement pump according to claim 1, characterized in that: A sealing plate (15) is provided on one side of the pump housing (1), a side flow channel is formed between the impeller (14) and the sealing plate (15), and a through groove (142) communicating with the side flow channel is provided on the impeller (14).

5. A high sealing non-variable displacement pump according to claim 4, characterized in that: The pump casing (1) is volute-shaped, and an inner ring groove (10) is provided on the inner wall of the volute, and the inner ring groove (10) limits the fluid.

6. A high-sealing non-variable displacement pump according to claim 4, characterized in that: A movable baffle (31) for shielding the through slot (142) is slidably connected to the impeller (14), and the movable baffle (31) moves as the impeller (14) accelerates its rotation.

7. A high sealing non-variable displacement pump according to claim 6, characterized in that: The movable baffle (31) comprises a baffle (321) slidably connected to the impeller (14); an extension rod (313) is provided on the baffle (321); and a spring (314) is provided between the extension rod (313) and the through slot (142).

8. A high sealing non-variable displacement pump according to claim 7, characterized in that: A slider (311) is provided on the extension rod (313), and the slider (311) is slidably connected to a sliding groove (143) provided on the impeller (14).

9. A high-sealing non-variable displacement pump component, comprising the high-sealing non-variable displacement pump according to any one of claims 1 to 8, comprising a pump casing (1), a movable baffle (31), an impeller (14) and a sealing plate (15), characterized in that: It also includes an extension ring (141) provided on the impeller (14), a sealing ring (32) being slidably connected to the extension ring (141), and the sealing ring (32) being driven to approach the sealing plate (15).

10. A high-sealing non-variable displacement pump component according to claim 9, characterized in that: A push ring (33) is slidably connected to the extension ring (141), and a slope (331) is provided on the push ring (33). The movable baffle (31) is driven to move and push against the slope (331), so that the push ring (33) approaches the sealing ring (32).

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