A high sealability non-variable displacement pump and components thereof

Abstract

The application relates to the technical field of centrifugal pumps, and particularly discloses a high-sealing non-variable-volume pump and components thereof, which comprises a pump shell and an impeller, a water inlet and a water outlet are respectively arranged on the pump shell, the pump shell is in a volute type, the volute type comprises a wide section and a narrow section, and the pump shell further comprises a flow assisting mechanism which comprises a flow distribution port and a flow distribution sleeve arranged on the narrow section of the pump shell, a plurality of liquid inlet holes are arranged in a circular array on the water inlet, and the flow distribution sleeve is covered on the flow distribution port and the liquid inlet hole at two ends respectively. In the application, the flow distribution sleeve guides the fluid into the flow distribution sleeve along the flow distribution port at the narrow section of the volute type with the largest pressure during the operation of the impeller, then the flow distribution sleeve supplements the fluid to the water inlet of the pump shell, and the negative pressure at the water inlet is supplemented to reduce the cavitation and prolong the service life of the centrifugal pump.

Description

Technical Field

[0001] This invention relates to centrifugal pump technology, specifically a high-sealing non-variable displacement pump and its components. Background Technology

[0002] As is generally known, non-volumetric pumps are also called dynamic pumps. These pumps do not rely on changes in the volume of a closed working chamber to transport fluids, but instead transport fluids through a high-speed rotating impeller. Centrifugal pumps belong to the category of non-volumetric pumps.

[0003] For example, the invention patent with publication number CN116104764A, publication date May 12, 2023, entitled "A Centrifugal Pump," includes: a pump casing and an impeller installed inside the pump casing. The impeller includes n blades, and an impeller flow channel is formed between adjacent blades. The inner circumference of the pump casing is provided with a volute flow channel with a rectangular cross-section. An annular guide ring is provided between the inner ring of the volute flow channel and the outer diameter of the impeller. The annular guide ring includes m guide blades, and a guide flow channel is formed between adjacent guide blades; n and m are both positive integers. The centrifugal pump of this invention has the advantages of compact structure, easy installation, high reliability, and low kinetic energy loss. It can greatly reduce the eddies formed in the pump flow channel, 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 by rotating the impeller at high speed, so that the center generates negative pressure for suction. However, when the suction height of the centrifugal pump is large and the inlet diameter is increased (that is, when the required negative pressure is increased), cavitation is prone to occur, which leads to a significant reduction in the service life of the pump casing. Summary of the Invention

[0005] The purpose of this invention is to provide a high-sealing non-variable displacement pump and its components to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a high-sealing non-variable displacement pump, comprising a pump casing and an impeller, wherein an inlet and an outlet are respectively provided on the pump casing, the pump casing is a volute type, the volute type includes a wide section and a narrow section, and further includes a flow-aiding mechanism, which includes a flow-dividing port and a flow-dividing sleeve provided on the narrow section of the pump casing, wherein a plurality of liquid inlet holes are provided in a circumferential array on the inlet, and the two ends of the flow-dividing sleeve are respectively covered on the flow-dividing port and the liquid inlet holes.

[0007] As a further description of the above technical solution, a concentrating ring is provided on the inner wall of the water inlet, and the liquid inlet hole corresponds to the concentrating 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 to 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 is provided on the impeller that communicates with the side flow channel.

[0010] As a further description of the above technical solution, the pump casing is volute-shaped, and an inner annular groove is formed on the inner wall of the volute-shaped casing to restrict the fluid.

[0011] As a further description of the above technical solution, a movable baffle for blocking 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 baffle plate slidably connected to the impeller, an extension rod is provided on the baffle 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 groove opened on the impeller.

[0014] A high-sealing non-variable displacement pump component further includes an extension ring disposed on the impeller, a sealing ring slidably connected to the extension ring, and the sealing ring being driven toward the sealing plate.

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

[0016] In the above technical solution, the present invention provides a high-sealing non-variable displacement pump and its components. During the impeller operation, the flow divider guides the fluid into the flow divider through the flow divider port at the narrow section of the volute where the pressure is greatest. Subsequently, the flow divider replenishes the fluid to the water inlet of the pump casing, replenishing the negative pressure at the water inlet, thereby reducing cavitation and improving the overall service life of the centrifugal pump. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0019] Figure 2This is an exploded view of the pump casing and flow-aiding mechanism provided in an embodiment of the present invention;

[0020] Figure 3 This is an exploded view of the pump body structure provided in an embodiment of the present invention;

[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of the movable baffle provided in an embodiment of the present invention;

[0023] Figure 6 This is a schematic cross-sectional view of the pump casing and the flow divider provided in an embodiment of the present invention;

[0024] Figure 7 This is a schematic cross-sectional view of the overall structure provided in an embodiment of the present invention;

[0025] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0026] Figure 9 for Figure 7 Enlarged view of point C in the middle;

[0027] Figure 10 for Figure 7 Enlarged diagram of point D in the middle.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Pump casing; 10. Inner annular groove; 11. Inlet; 111. Concentrating ring; 12. Outlet; 13. Diverter; 14. Impeller; 141. Extension ring; 142. Through groove; 143. Slide groove; 15. Sealing plate; 2. Flow aid mechanism; 21. Diverter sleeve; 211. Liquid flow groove; 22. Liquid inlet hole; 31. Movable baffle; 311. Slider; 321. Baffle plate; 313. Extension rod; 314. Spring; 32. Sealing ring; 33. Push ring; 331. Inclined surface. Detailed Implementation

[0030] 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

[0031] Please see Figure 1-10The present invention provides a technical solution: a high-sealing non-variable displacement pump, including a pump casing 1 and an impeller 14. The pump casing 1 is provided with an inlet 11 and an outlet 12. The pump casing 1 is a volute type, which includes a wide section and a narrow section. It also includes a flow aid mechanism 2, which includes a flow divider 13 and a flow divider sleeve 21 opened on the narrow section of the pump casing 1. The inlet 11 is provided with a plurality of liquid inlet holes 22 in a circumferential array. The two ends of the flow divider sleeve 21 are respectively covered by the flow divider 13 and the liquid inlet holes 22.

[0032] Specifically, volute-type, such as Figure 1 As shown, starting from the left end of the outlet 12 of the pump casing 1, the diameter of the disc gradually increases. The outlet 12 is located at the center of the volute. A diversion port 13 is provided on the narrow section of the volute. When the impeller 14 is driven to rotate, the rotating impeller 14 causes the fluid in the volute to be thrown out by centrifugal force, thereby forming a negative pressure at 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 discharges from the outlet 12. The fluid in the narrow section is restricted, thereby increasing the pressure. The air bubbles under negative pressure are more likely to cause cavitation at the high pressure position. The diversion port 13 guides the fluid in the narrowest section into the diversion sleeve 21 and into the inlet hole 22 on the inlet 11, diverting the high pressure and supplementing the water intake of the inlet 11, reducing the negative pressure, thereby reducing cavitation and increasing the service life of the pump casing 1.

[0033] Preferably, the flow divider sleeve 21 is provided with a flow channel 211, which is connected to the inlet hole 22 and the flow divider port 13 to allow fluid flow. The flow divider port 13 occupies 10% to 17% of the pump casing 1 and is located on the central axis.

[0034] In the above scheme, during the operation of the impeller 14, the flow divider 21 guides the fluid into the flow divider 21 along the flow divider port 13 at the volute-type narrow section where the pressure is greatest. Then the flow divider 21 replenishes the fluid to the inlet 11 of the pump casing 1, replenishing the negative pressure at the inlet 11.

[0035] In one embodiment of the present invention, a concentration ring 111 is provided on the inner wall of the water inlet 11, and the liquid inlet hole 22 corresponds to the concentration ring 111.

[0036] Specifically, such as Figure 9 As shown, the diameter of the concentrating ring 111 is smaller than that of the inlet 11, and the concentrating ring 111 is arc-shaped to guide the fluid to move towards the central axis of the inlet 11. The inlet hole 22 corresponds to the concentrating ring 111. After the fluid entering the inlet 11 enters the pump casing 1 along the concentrating ring 111, the fluid in the diverting sleeve 21 enters the inlet 11 along the inlet hole 22 and merges with the fluid. Thus, under the condition that the original negative pressure of the inlet remains unchanged, the fluid is supplemented to alleviate the negative pressure of the fluid reaching the impeller 14 and to alleviate the cavitation phenomenon.

[0037] In another embodiment of the present invention, a sealing plate 15 is provided on one side of the pump casing 1, and a side flow channel is formed between the impeller 14 and the sealing plate 15. A through groove 142 communicating with the side flow channel is provided on the impeller 14.

[0038] Specifically, the pump casing 1 has an inlet 11 and a sealing plate 15 on each side. The sealing plate 15 is fixed to one side with screws, so that the pump casing 1 forms a cavity for fluid flow. There is a gap 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 through groove 142, thereby splitting the two streams of fluid that are thrown out. After the flow is split, it is guided separately to reduce the situation of fluid collision and reduce the pressure on the blades on the impeller 14, thus alleviating the phenomenon of cavitation. The other side of the impeller 14 does not have blades (that is, the side flow channel part). The width of the side flow channel is 3mm~10mm, so that the fluid is thrown out by friction and centrifugal force.

[0039] Preferably, the pump casing 1 is volute-shaped, and the inner wall of the volute-shaped casing has an inner annular groove 10, such as... Figure 10 As shown, the inner annular groove 10 has curved corners at both ends. The inner annular groove 10 and the curved corners work together to restrict the fluid to the outside of the pump casing 1, so that the fluid flows along the inner annular groove 10 with centrifugal force. The side flow channel faces one of the curved corners, guiding the diverted fluid to converge in the inner annular groove 10, and then flows out along the outlet 12 after convergence.

[0040] Preferably, an movable baffle 31 for blocking the through-slot 142 is slidably connected to the impeller 14. The movable baffle 31 moves as the impeller 14 accelerates its rotation to expand the area of ​​the through-slot 142 and increase the amount of fluid entering the side flow channel. When the rotational speed of the impeller 14 has not reached its maximum, the through-slot 142 is partially blocked by the movable baffle 31 to reduce the amount of fluid entering the side flow channel. When the rotational speed of the impeller 14 increases to its maximum, the movable baffle 31 moves to expand the unblocked portion of the through-slot 142 to increase the amount of fluid entering the side flow channel.

[0041] 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 and is slidably connected in the through groove 142 to assist 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 and is slidably connected in the slide groove 143 opened on the impeller 14. The slider 311 provides a counterweight effect while sliding. The spring 314 pushes the extension rod 313 to make the baffle 321 block the through groove 142.

[0042] When the centrifugal pump is running, the impeller 14 is driven to rotate. The rotating impeller 14 causes the fluid in the volute to be thrown out by centrifugal force, thereby creating a negative pressure at the center of the impeller 14 to draw the fluid from the inlet 11. At the same time, the fluid in the narrowest section is guided by the diverter 13 into the diverter sleeve 21 and into the liquid inlet hole 22 on the inlet 11 to replenish the negative pressure at the inlet 11. Another part of the liquid entering the impeller 14 will enter the side flow channel in advance along the through groove 142. The two liquids enter the inner ring groove 10 and flow out along the 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 through groove 142 to increase the fluid entering the side flow channel. Example 2

[0043] Please see Figure 1-5 The present invention provides a technical solution: a high-sealing non-variable displacement pump component, which further includes an extension ring 141 disposed on the impeller 14, a sealing ring 32 slidably connected on the extension ring 141, and the sealing ring 32 being driven to approach the sealing plate 15.

[0044] Specifically, the extension ring 141 is connected to the drive 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 mating part. The friction part is made of graphite and is mated to the sealing plate 15 for friction sealing. The mating part is made of a layer of polytetrafluoroethylene and a layer of rubber. One side of the polytetrafluoroethylene layer restricts the extension ring 141 from rotating together with the impeller 14.

[0045] 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 and push against the inclined surface 331, so that the push ring 33 moves closer to the sealing ring 32.

[0046] Specifically, the extension rod 313 on the movable baffle 31 has an angled opening. The angled opening 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 against the sealing ring 32 to compress the rubber layer of the fitting part and increase the sealing performance of the sealing ring 32.

[0047] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

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 an inlet (11) and an outlet (12), the pump casing (1) being a volute type, the volute type comprising a wide section and a narrow section, characterized in that, It also includes a flow aid mechanism (2), which includes a flow divider (13) and a flow divider sleeve (21) opened on the narrow section of the pump casing (1). The inlet (11) has a plurality of liquid inlet holes (22) arranged in a circumferential array. The two ends of the flow divider sleeve (21) are respectively covered by the flow divider (13) and the liquid inlet holes (22). A sealing plate (15) is provided on one side of the pump casing (1), and a side flow channel is formed between the impeller (14) and the sealing plate (15). A through groove (142) connected to the side flow channel is provided on the impeller (14). The impeller (14) is slidably connected to a movable baffle (31) for blocking the through slot (142), and the movable baffle (31) moves as the impeller (14) accelerates its rotation; The movable baffle (31) includes 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 groove (142). The extension rod (313) is provided with a slider (311), which is slidably connected to the groove (143) opened on the impeller (14).

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

3. The high-sealing non-variable displacement pump according to claim 1, characterized in that, The flow divider sleeve (21) is provided with a flow channel (211), which is connected to the inlet hole (22) and the flow divider (13).

4. A high-sealing non-variable displacement pump according to claim 1, characterized in that, The inner wall of the volute is provided with an inner annular groove (10), which restricts the fluid.

5. A high-sealing non-variable displacement pump component, comprising the high-sealing non-variable displacement pump according to any one of claims 1 to 4, 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) disposed on the impeller (14), on which a sealing ring (32) is slidably connected, and the sealing ring (32) is driven toward the sealing plate (15).

6. A high-sealing non-variable displacement pump component according to claim 5, characterized in that, A push ring (33) is slidably connected to the extension ring (141). An inclined surface (331) is provided on the push ring (33). The movable baffle (31) is driven to move and push against the inclined surface (331), so that the push ring (33) moves closer to the sealing ring (32).

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