A guide vane body with cooling channel, an axial flow pump and a manufacturing method thereof

Abstract

The present invention relates to a guide vane body with a cooling channel, comprising a blade and a guide vane hub, wherein a first channel is provided inside the blade, which runs from one end away from the guide vane hub to one end connected to the guide vane hub, and a second channel is provided inside the guide vane hub, wherein the inlet of the second channel is connected to the first channel, and the outlet of the second channel is located at the end surface of the guide vane hub. The guide vane body with a cooling channel of the present invention can provide a cooling channel for circulating cooling water for a water-lubricated bearing without changing the external shape of the guide vane body, thereby overcoming the technical problems of small cooling water volume and poor cooling effect of existing water-lubricated bearings.

Description

Technical Field

[0001] The invention relates to the field of cavitation water tunnel experiments, in particular to a guide vane body with a cooling channel, an axial flow pump and methods for manufacturing the same. Background Art

[0002] The axial flow pump system of the large cavitation water tunnel test bench consists of a drive motor, shaft system, water-lubricated bearings, impellers, guide vanes and thrust bearings. Figure 1 As shown, two water-lubricated bearings are arranged on the front and rear sides of the impeller to support the impeller and the transmission shaft. The front water-lubricated bearing is installed in the front hub, which is welded to the cylinder through a support arm. The force of the front water-lubricated bearing is transmitted to the cylinder through the support arm. The rear water-lubricated bearing is installed in the hub of the guide vane body, that is, the rear hub. The load borne by the rear water-lubricated bearing is transmitted to the cylinder through the blades of the guide vane body. The two bearings are arranged to support the rotation of the shaft system and the impeller.

[0003] Water-lubricated bearings are made of polymer materials. Since the bearings bear a large load, they need to be cooled during the operation of the impeller. Since the bearings work in a water hole and are surrounded by flowing water, it is best to lubricate and cool the bearings with flowing water. Figure 1 The arrow in the figure shows the flow path of the cooling water. However, the axial clearance between the front end face of the hub of the guide vane body and the rear end face of the impeller is small, and the amount of cooling water passing through the clearance for cooling and lubricating the rear bearing is small, resulting in a poor cooling effect on the bearing. Summary of the invention

[0004] The present invention provides a guide vane body with a cooling channel, which can provide a cooling channel for circulating cooling water for a water-lubricated bearing without changing the external shape of the guide vane body, thereby overcoming the technical problems of small cooling water volume and poor cooling effect of existing water-lubricated bearings.

[0005] The guide vane body with a cooling channel of the present invention comprises a blade and a guide vane hub, wherein a first channel is provided inside the blade and runs from an end thereof away from the guide vane hub to an end thereof connected to the guide vane hub, and a second channel is provided inside the guide vane hub, wherein an inlet of the second channel is communicated with the first channel, and an outlet of the second channel is located at the end face of the guide vane hub.

[0006] Preferably, the first channel comprises a groove opened on the blade and a pipe buried in the groove, and the groove is filled by surfacing welding.

[0007] Preferably, the second passage includes a radial portion extending in the radial direction of the guide vane hub and an axial portion extending parallel to the axial direction of the guide vane hub.

[0008] Preferably, the guide vane hub is provided with a cylindrical portion at the edge of one end where the outlet of the first passage is provided.

[0009] Preferably, two or more blades are provided with first channels, and the guide vane hub is provided with second channels corresponding one-to-one to the two or more first channels.

[0010] The present invention also provides an axial flow pump, comprising:

[0011] A cylinder, wherein a first water inlet hole is provided on a wall of the cylinder;

[0012] a guide vane body fixed to the inner wall of the cylinder, the guide vane body being the guide vane body as described above, and the first channel of the blades of the guide vane body being in communication with the first water inlet hole, and a rear water lubricated bearing being installed in the guide vane hub of the guide vane body, and the first water inlet hole, the first channel and the second channel forming a first cooling water channel;

[0013] A shaft, located in the cylinder, passes through the inner ring of the rear water-lubricated bearing and can rotate synchronously therewith;

[0014] An impeller, comprising a rotating hub and rotating blades, wherein the impeller is mounted on the shaft through the rotating hub and can rotate under the drive of the shaft;

[0015] A cooling water pump, which delivers water outside the cylinder into the first cooling water channel;

[0016] The cylindrical portion of the guide vane hub, the front end surface of the guide vane hub, the rear end surface of the impeller rotating hub and the shaft together form a cooling water space, and the cooling water space is communicated with the outlet of the second channel.

[0017] Preferably, the axial flow pump is provided with two first cooling water channels, and the first channels of the two first cooling water channels are respectively located at different blades of the guide vane body.

[0018] Preferably, the axial flow pump also includes a front hub fixed to the inner wall of the cylinder and to the bearing support arm, and a front water-lubricated bearing installed in the front hub, the wall of the cylinder is provided with a second water inlet hole, the bearing support arm is provided with a first cooling hole communicated with the second water inlet hole, the front hub is provided with a second cooling hole communicated with the first cooling hole, the water outlet of the second cooling hole is opened on the end face of the front hub, the second water inlet hole, the first cooling hole and the second cooling hole constitute a second cooling water channel, and the cooling water pump delivers water outside the cylinder into the second cooling water channel.

[0019] Preferably, the axial flow pump has multiple bearing arms, one end of each bearing arm is fixedly connected to the inner wall of the cylinder, and the other end is fixedly connected to the outer wall of the front hub, and at least one bearing arm is provided with a first cooling hole.

[0020] The present invention also provides a method for manufacturing a guide vane body, which is used to manufacture the guide vane body as described above, comprising the following steps:

[0021] S1, manufacturing blade blanks and guide vane hubs;

[0022] S2, a groove is opened on the blade blank, a pipe is buried in the groove, and the groove is filled by surfacing welding to leave room for subsequent processing of the blade;

[0023] S3, further processing the blade blank to give it a final blade shape;

[0024] S4, drilling a hole on the guide vane hub to form a second channel, so that the first channel is connected to the second channel.

[0025] Preferably, in step S1, the blade blank and the guide vane hub are manufactured separately, and in step S4, the first channel is connected to the second channel by assembling and fixing the blade and the guide vane hub together; or in step S1, the blade blank and the guide vane hub are cast as one piece.

[0026] The present invention also provides a method for manufacturing an axial flow pump. Based on the above-mentioned method for manufacturing a guide vane body, the method further includes the following steps: making a first water inlet hole on the cylinder body, installing the guide vane body in the cylinder body, and making the first water inlet hole correspond to and communicate with the first channel.

[0027] Preferably, the following steps are also included: manufacturing a bearing arm and a front axle hub, opening a first cooling hole in the bearing arm, opening a second cooling hole in the front axle hub, opening a second water inlet hole in the cylinder, fixing one end of the bearing arm to the inner wall of the cylinder, fixing the front axle hub to the other end of the bearing arm, and connecting the second water inlet hole, the second cooling hole and the first cooling hole to form a second cooling water channel, and connecting a cooling water pump to the second water inlet hole to deliver cooling water outside the cylinder into the second cooling water channel.

[0028] Compared with the prior art, the present invention has the following beneficial effects: the guide vane body of the present invention has a cooling channel, and the cooling channel passes through the inside of the blade and the guide vane hub, and sends cooling water to the end face of the guide vane hub, thereby cooling and lubricating the rear water-lubricated bearing arranged in the guide vane hub. Compared with the prior art, the flow rate of cooling water can be increased, and at the same time, the water flow in the cylinder is not disturbed, so the quality of the flow field of the cylinder can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of an axial flow pump system in the prior art.

[0030] Figure 2 The present invention is a schematic structural diagram of a guide vane body with a cooling channel installed in one direction behind a cylinder according to an embodiment of the present invention.

[0031] Figure 3 The present invention is a schematic structural diagram of a guide vane body with a cooling channel after being installed on a cylinder body and cut along a cross section according to an embodiment of the present invention.

[0032] Figure 4 The axial flow pump of one embodiment of the present invention is Figure 3 Schematic diagram of the structure after cutting along the AA line.

[0033] Figure 5 A route map of a first cooling water channel is provided for a method for manufacturing an axial flow pump according to an embodiment of the present invention.

[0034] Figure 6 The blade is formed by the manufacturing method of an axial flow pump according to an embodiment of the present invention.

[0035] Figure 7 A guide vane hub is formed by a manufacturing method of an axial flow pump according to an embodiment of the present invention.

[0036] Attached photos

[0037] Figure 1

[0038] a cylinder, b driving motor, c shaft system, d guide vane body, e impeller, f front water-lubricated bearing, g front hub, h rear water-lubricated bearing, i rear hub, j support arm.

[0039] Figure 2-7

[0040] 1 guide vane body, 11 blade, 111 first channel, 1111 groove, 1112 pipeline, 12 guide vane hub, 121 second channel, 1211 radial portion, 1212 axial portion, 122 cylindrical portion, 13 rear water-lubricated bearing;

[0041] 2 cylinder, 21 first water inlet hole, 22 second water inlet hole;

[0042] 3 axes;

[0043] 4 impeller, 41 rotating blades, 42 rotating hub;

[0044] 5 rear cone, 51 mounting through hole;

[0045] 6 Cooling water space. DETAILED DESCRIPTION

[0046] The present invention provides a guide vane body 1 with a cooling channel, such as Figure 2 and Figure 3As shown, it includes a blade 11 and a guide vane hub 12. The blade 11 is fixed to the outer cylindrical surface of the guide vane hub 12. The blade 11 and the guide vane hub 12 can be integrally formed, or they can be manufactured separately and then installed and fixed together. The blade 11 is provided with a first channel 111 that runs from one end away from the guide vane hub 12 to the end connected to the guide vane hub 12. On the same horizontal plane, the extension direction of the first channel 111 is the same as the extension direction of the blade 11, and the first channel 111 is maintained inside the blade 11. A second channel 121 is provided inside the guide vane hub 12. The inlet of the second channel 121 is connected to the first channel 111, and the outlet of the second channel 121 is located at the front end face of the guide vane hub 12, which is the end face of the guide vane hub 12 that is close to and opposite to the impeller in the present invention.

[0047] The first channel and the second channel of the guide vane body 1 of the present invention form a cooling channel, and the cooling channel passes through the inside of the blade 11 and the guide vane hub 12, and sends cooling water to the end face of the guide vane hub 12, that is, the end of the rear water-lubricated bearing 13, so that it can enter the bearing water tank between the rear water-lubricated bearing 13 and the 3rd axis, thereby cooling and lubricating the rear water-lubricated bearing 13 arranged in the guide vane hub 12. Compared with the existing technology, the flow rate of cooling water can be increased, and at the same time, the water flow in the cylinder 2 is not disturbed, so the quality of the water flow field in the cylinder 2 can be maintained.

[0048] like Figure 3 As shown, the first channel 111 includes a groove 1111 opened on the blade 11 and a pipe 1112 buried in the groove 1111. The direction of the groove 1111 changes with the shape of the blade 11, from the end of the blade away from the guide vane hub 12 to the end close to the guide vane hub 12. The width and depth of the groove 1111 are slightly larger than the diameter of the pipe 1112. The pipe 1112 is generally made of a stainless steel pipe, and the shape of the stainless steel pipe changes with the shape of the groove 1111. Figure 5 As shown, the groove 1111 is filled by surfacing, so that the pipe 1112 is completely enclosed in the blade 11, and a smooth transition is formed between the surfacing portion and the position where the blade 11 is connected, and a processing margin is reserved for the surfacing portion, and subsequent grinding and other processing can be performed to make the blade 11 reach the designed shape.

[0049] In this embodiment, the second channel 121 of the guide vane hub 12 includes a radial portion 1211 extending along the radial direction of the guide vane hub 12 and an axial portion 1212 extending parallel to the axial direction of the guide vane hub 12, and the outlet of the axial portion 1212 is located at one end surface of the guide vane hub 12, and the end surface of the guide vane hub 12 is opposite to one end surface of the hub of the impeller 4 of the axial flow pump. In this embodiment, the two blades 11 are provided with a first channel 111, and the guide vane hub 12 is provided with two second channels 121 corresponding to the first channel 111, that is, two cooling channels are formed on the guide vane body 1, and the two cooling channels can transport cooling water at the same time, thereby further increasing the flow rate of cooling water, thereby improving the cooling and lubrication effects.

[0050] In this embodiment, if Figure 7 As shown, the guide vane hub 12 is provided with a cylindrical portion 122 at the edge of one end of the outlet of the first channel 111, and the second channel 121 guides water to the internal space of the cylindrical portion 122, and enters the bearing water tank between the rear water-lubricated bearing 13 and the 3rd axis from this space. The bearing water tank is an existing structure and is not described in detail in the present invention.

[0051] The present invention also provides an axial flow pump, which includes: a barrel 2, a guide vane body 1, a shaft 3, an impeller 4 and a cooling water pump (not shown in the figure), wherein the wall of the barrel 2 is provided with a first water inlet hole 21, and the guide vane body 1 is fixed to the inner wall of the barrel 2, and the fixing relationship between the two is conventional. The structure of the guide vane body 1 is as described above, such as Figure 4-5 As shown, the first channel 111 of the guide vane body 1 is communicated with the first water inlet hole 21, a rear water-lubricated bearing 13 is installed in the guide vane hub 12 of the guide vane body 1, the first water inlet hole 21, the first channel 111 and the second channel 121 form a first cooling water channel, and the first channel 111 does not have an inflection point to prevent the water pressure from being reduced when the water flow turns.

[0052] like Figure 4 As shown, the shaft 3 is located in the cylinder 2 and passes through the rear water-lubricated bearing 13, and can rotate relative to the rear water-lubricated bearing 13. The rear water-lubricated bearing 13 supports the shaft 3. The impeller 4 includes rotating blades 41 and a rotating hub 42. The impeller 4 is installed on the shaft 3 through the rotating hub 42 and can rotate under the drive of the shaft 3. The structure and connection relationship of the shaft 3 and the impeller 4 are the same as those of the existing axial flow pump.

[0053] The cylindrical portion 122 of the guide vane hub 12 is sleeved outside the shaft 3, and there is a certain distance between the inner wall of the cylindrical portion 122 and the outer wall of the shaft 3. The cylindrical portion 122, the front end surface of the guide vane hub 12, the rear end surface of the rotating hub of the impeller 4 and the shaft 3 together form a cooling water space 6, and the cooling water space 6 is communicated with the outlet of the second channel 121. Figure 4As shown by the arrow in , the cooling water in the cooling water space 6 passes through the bearing water groove of the rear water-lubricated bearing 13 and finally flows out from the mounting through hole of the rear cone 5 connected to the rear end of the guide vane hub 12. The structure of the rear cone 5 is existing.

[0054] like Figure 4 and Figure 5 As shown, the axial flow pump is provided with two first cooling water channels, namely, two first water inlet holes 21, two first channels 111 and two second channels 121, wherein the first channels 111 of the two cooling water channels are respectively located at different blades 11, and the two first cooling water channels can inject cooling water into the cooling water space at different positions at the same time, which can further increase the amount of cooling water.

[0055] The axial flow pump of the present invention delivers cooling water outside the barrel 2 to the cooling water space through the cooling water pump and the first cooling water channel, cools and lubricates the rear water-lubricated bearing 13, and forms forced cooling. Compared with the existing cooling method, the flow rate of cooling water is increased, thereby improving the cooling and lubrication effects. At the same time, since the shape of the guide impeller 4 does not change, it will not affect the water flow in the barrel 2, so that the quality of the water flow field in the barrel 2 can be maintained.

[0056] In this embodiment, the axial flow pump also includes a bearing support arm (not shown in the figure) fixed to the inner wall of the cylinder 2, a front hub (not shown in the figure) fixed to the bearing support arm, and a front water-lubricated bearing (not shown in the figure) installed in the front hub. The shaft 3 passes through the front water-lubricated bearing and can rotate relative to the front water-lubricated bearing. The bearing support arm, the front hub and the front water-lubricated bearing form a front support for the shaft 3. The wall of the cylinder 2 is provided with a second water inlet hole 22, the bearing support arm is provided with a first cooling hole 1 communicating with the second water inlet hole 22, the front axle hub is provided with a second cooling hole 1 communicating with the first cooling hole 1, the water outlet of the second cooling hole 1 is opened on the end face of the front axle hub, the second water inlet hole 22, the first cooling hole 1 and the second cooling hole 1 constitute a second cooling water channel, the cooling water pump sends water outside the cylinder 2 into the second cooling water channel, compared with the existing scheme of cooling with water in the cylinder 2, the flow rate of cooling water can be increased, thereby improving the cooling and lubrication effects, and because the water temperature outside the cylinder 2 is low, the cooling efficiency can be further improved, and at the same time, the second cooling water channel is located in the front support, which will not affect the quality of the water flow field of the cylinder 2. The axial flow pump can be provided with a plurality of bearing support arms, one end of each bearing support arm is fixedly connected to the inner wall of the cylinder 2, and the other end is fixedly connected to the outer wall of the front axle hub, at least one bearing support arm is provided with a first cooling hole 1, preferably two second cooling water channels are provided, and the two cooling water channels are located in different bearing support arms.

[0057] The present invention also provides a method for manufacturing a guide vane body 1, which is used for the guide vane body 1 as described above, and comprises the following steps:

[0058] S1, manufacturing a blade blank and a guide vane hub; in this step, the blade blank and the guide vane hub 12 may be integrally cast, or may be manufactured separately and then assembled and fixed; in addition, before manufacturing the blade blank and the guide vane hub, a three-dimensional image of the blade may be presented by three-dimensional software, and a first channel 111 may be designed in the software to pass through the blade 11 of the guide vane body 1, and a second channel 121 may be designed to pass through the guide vane hub 12, so that the second channel 121 is connected to the first channel 111 to guide water to the end surface of the guide vane hub 12, and it is determined that no inflection point is generated in the first channel 111; Figure 5 The routes of the first channel 111 and the second channel 121 are shown; the position and size of the first channel 111 can also be determined on the blade 11, and the position and size of the second channel 121 can be determined on the guide vane hub 12 in the three-dimensional software;

[0059] S2, opening a groove on the blade blank according to the determined position and size, burying a pipe in the groove, and filling the groove by surfacing welding to leave room for subsequent processing of the blade;

[0060] S3, further processing the blade blank to obtain the final blade shape, and this processing process is generally grinding;

[0061] S4, drilling a hole on the guide vane hub to form a second channel, so that the first channel is connected to the second channel.

[0062] The present invention also provides a method for manufacturing an axial flow pump. On the basis of completing the manufacturing method of the guide vane body 1 as described above, the method further includes the following steps: making a first water inlet hole 21 on the cylinder 2, fixing the guide vane body 1 in the cylinder 2, and making the first water inlet hole 21 correspond to and communicate with the first channel 111.

[0063] In this embodiment, the following steps are also included: manufacturing a bearing arm and a front axle hub, opening a first cooling hole in the bearing arm, opening a second cooling hole in the front axle hub, the outlet of the second cooling hole is arranged on the end face of the front axle hub, opening a second water inlet hole in the cylinder 2, fixing one end of the bearing arm to the inner wall of the cylinder 2, fixing the front axle hub to the other end of the bearing arm, and connecting the second water inlet hole, the second cooling hole and the first cooling hole in sequence to form a second cooling water channel, and connecting a cooling water pump to the second water inlet hole 22 to deliver cooling water outside the cylinder 2 into the second cooling water channel.

[0064] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Various modifications or equivalent substitutions made by those skilled in the art to the present invention within the essence and protection scope of the present invention also fall within the protection scope of the present invention.

Claims

1. An axial flow pump with a cooling channel for cavitation water tunnel experiments, characterized in that: include: A cylinder, wherein a first water inlet hole is provided on a wall of the cylinder; A guide vane body is fixed to the inner wall of the cylinder, the guide vane body comprises blades and a guide vane hub, a first channel is provided inside the blade from one end away from the guide vane hub to one end connected to the guide vane hub, a second channel is provided inside the guide vane hub, an inlet of the second channel is communicated with the first channel, an outlet of the second channel is located at the end surface of the guide vane hub, the first channel of the blade of the guide vane body is communicated with the first water inlet hole, a rear water lubricated bearing is installed in the guide vane hub of the guide vane body, and the first water inlet hole, the first channel and the second channel form a first cooling water channel; A shaft, located in the cylinder, passing through the rear water-lubricated bearing, and rotatable relative to the rear water-lubricated bearing; An impeller, comprising a rotating hub and rotating blades, wherein the impeller is mounted on the shaft through the rotating hub and can rotate under the drive of the shaft; A cooling water pump, which delivers water outside the cylinder into the first cooling water channel; The cylindrical portion of the guide vane hub, the front end face of the guide vane hub, the rear end face of the impeller's rotating hub and the shaft together form a cooling water space, and the cooling water space is connected to the outlet of the second channel. The cooling water in the cooling water space lubricates and cools the rear water-lubricated bearing, and the cooling water passing through the rear water-lubricated bearing flows out from the mounting through hole of the rear cone connected to the rear end of the guide vane hub.

2. The axial flow pump according to claim 1, characterized in that: The first channel includes a groove opened on the blade and a pipe buried in the groove, and the groove is filled by surfacing.

3. The axial flow pump according to claim 1 or 2, characterized in that: The second passage includes a radial portion extending in a radial direction of the guide vane hub and an axial portion extending parallel to an axial direction of the guide vane hub.

4. The axial flow pump according to claim 1, characterized in that: The guide vane hub has a cylindrical portion at its edge at one end where the outlet of the first passage is provided.

5. The axial flow pump according to claim 1, characterized in that: Two or more blades are provided with first channels, and the guide vane hub is provided with second channels corresponding to the two or more first channels one by one.

6. The axial flow pump according to claim 1, characterized in that: The axial flow pump is provided with two first cooling water channels, and the first channels of the two first cooling water channels are respectively located at different blades of the guide vane body.

7. The axial flow pump according to claim 6, characterized in that: The axial flow pump also includes a plurality of bearing arms, a front axle hub fixed to the inner wall of the cylinder and to the bearing arms, and a front water-lubricated bearing installed in the front axle hub, the wall of the cylinder is provided with a second water inlet hole, the bearing arm is provided with a first cooling hole communicated with the second water inlet hole, the front axle hub is provided with a second cooling hole communicated with the first cooling hole, the water outlet of the second cooling hole is opened on the end face of the front axle hub, the second water inlet hole, the first cooling hole and the second cooling hole constitute a second cooling water channel, and the cooling water pump delivers water outside the cylinder into the second cooling water channel.

8. The axial flow pump according to claim 7, characterized in that: One end of each bearing support arm is fixedly connected to the inner wall of the cylinder, and the other end is fixedly connected to the outer wall of the front hub. At least one bearing support arm is provided with a first cooling hole.

9. A method for manufacturing an axial flow pump, characterized in that: The method for manufacturing a guide vane body of an axial flow pump according to any one of claims 1 to 8 comprises the following steps: S1, manufacturing blade blanks and guide vane hubs; S2, a groove is opened on the blade blank, a pipe is buried in the groove, and the groove is filled by surfacing welding to leave room for subsequent processing of the blade; S3, further processing the blade blank to give it a final blade shape; S4, drilling a hole on the guide vane hub to form a second channel, so that the first channel is connected to the second channel, and the outlet of the second channel is located at the end surface of the guide vane hub.

10. The method for manufacturing an axial flow pump according to claim 9, characterized in that: In step S1, the blade blank and the guide vane hub are manufactured separately, and in step S4, the first channel is connected to the second channel by assembling and fixing the blade and the guide vane hub together; or in step S1, the blade blank and the guide vane hub are integrally cast.

11. The method for manufacturing an axial flow pump according to claim 9 or 10, characterized in that: On the basis of completing steps S1-S4, the following steps are also included: making a first water inlet hole on the cylinder, installing the guide vane body in the cylinder, and making the first water inlet hole correspond to and communicate with the first channel.

12. The method for manufacturing an axial flow pump according to claim 11, characterized in that: The following steps are also included: A bearing arm and a front axle hub are manufactured, a first cooling hole is opened in the bearing arm, a second cooling hole is opened in the front axle hub, and a second water inlet hole is opened in the cylinder; one end of the bearing arm is fixedly connected to the inner wall of the cylinder, the front axle hub is fixed to the other end of the bearing arm, and the second water inlet hole, the second cooling hole and the first cooling hole are connected to form a second cooling water channel; a cooling water pump is connected to the second water inlet hole to deliver cooling water outside the cylinder into the second cooling water channel.

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