Hydraulic drive and its application hydraulic fan

Abstract

The present invention relates to a hydraulic drive and a hydraulic fan applied thereto, comprising a pump body, a first cavity, a water inlet and a water outlet on the cavity wall of the first cavity; a hydraulic impeller rotatably arranged in the first cavity; a pump shaft connected to the hydraulic impeller; the hydraulic impeller comprising a first wheel body and a first blade; the center height of the water inlet is located at a quarter to a half of the first blade from the outside to the inside when the first blade rotates to the highest point; the water inlet and the water outlet are arranged up and down relative to the pump shaft and are arranged on the same side, and the water inlet is above the pump shaft. The hydraulic drive obtained by the present invention and the hydraulic fan applied thereto have the advantages that the water inlet and the water outlet are arranged on the same side, the water flow impact distance is long, the energy utilization rate is high, and there are many solid parts filled with water flow, the distance between the water inlet and the water outlet is small, the space with sparse water flow is small, and vibration can be effectively prevented; the overall energy utilization rate is high, and it is a water energy conversion method suitable for high head and ultra-low flow.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic application, in particular to a hydraulic driver and a hydraulic fan using the same. Background Art

[0002] In the prior art, water with a certain pressure can be used as a power output source, and the hydraulic energy is converted into mechanical energy through a hydraulic drive device to drive the mechanical equipment to operate. The traditional hydraulic drive device uses a centrifugal impeller, and the energy conversion efficiency is low for a hydraulic source with a small flow and a high head. Summary of the invention

[0003] An object of the present application is to provide a hydraulic drive and a hydraulic fan used therein, which have high energy utilization rate.

[0004] The technical solution adopted in this application is: a hydraulic drive, comprising:

[0005] The pump body is provided with a first cavity with a circular cross section, the first cavity is provided with a first axial opening, and a water inlet and a water outlet are provided on the cavity wall of the first cavity;

[0006] A pump cover, used to block the first opening and detachably connected to the pump body;

[0007] A hydraulic impeller is rotatably disposed in the first cavity and arranged coaxially with the first cavity;

[0008] A pump shaft connected to a hydraulic impeller;

[0009] The pump cover is provided with a second axial opening, and the pump shaft is passed through the second opening; the hydraulic impeller includes a first wheel body and a first blade; the extension direction of the water inlet is perpendicular to the radial direction of the highest point of the hydraulic impeller, and the center height of the water inlet is located at one-quarter to one-half of the first blade from the outside to the inside when it rotates to the highest point; the height of the lower end of the water outlet is located at one-quarter to one-half of the first blade from the outside to the inside when it rotates to the lowest point, and the height of the upper end of the water outlet is not higher than the height of the center of the hydraulic impeller; the water inlet and the water outlet are arranged up and down relative to the pump shaft and are set on the same side, and the water inlet is above the pump shaft.

[0010] Compared with the prior art, the advantages of the present application are that the water inlet and the water outlet are arranged on the same side, the water flow impact distance is long, the energy utilization rate is high, and there are more solid parts filled with water, the distance between the water inlet and the water outlet is small, and the space with sparse water flow is small, which can effectively prevent vibration and improve operational stability; the overall energy utilization rate is high, and it is a water energy conversion method suitable for high head and ultra-low flow.

[0011] In some embodiments of the present application, the water inlet is a circular hole; the diameter of the water inlet is the same as the thickness of the first blade; the center of the water inlet and the midpoint of the thickness of the first blade are on the same plane; the cross-section of the water outlet is rectangular; the thickness of the water outlet is greater than the thickness of the first blade; the cross-sectional area of ​​the water outlet gradually decreases from the inside to the outside; and the bottom surface of the water outlet directly connected to the first cavity is parallel to the horizontal plane.

[0012] In some embodiments of the present application, a water inlet cavity is provided on the first cavity, the water inlet cavity includes a first surface and a second surface perpendicular to each other, the second surface is tangent to the highest point of the first cavity, and the water inlet is arranged on the first surface.

[0013] In some embodiments of the present application, the pump body is provided with a water inlet pipe extending outward, the water inlet pipe is provided with a water inlet channel, the water inlet channel is connected to the water inlet through a conical surface, and the radial cross-sectional area of ​​the conical surface gradually increases from the inside to the outside; the pump body is provided with a water outlet pipe extending outward, the water outlet pipe is provided with a water outlet channel, the water outlet channel is connected to the water outlet, and the radial cross-sectional area of ​​the water outlet channel gradually increases from the inside to the outside.

[0014] In some embodiments of the present application, the center height of the water inlet is located at one-third of the first blade from the outside to the inside when it rotates to the highest point; the height of the lower end of the water outlet is located at one-third of the first blade from the outside to the inside when it rotates to the lowest point.

[0015] In some embodiments of the present application, a step is provided on the pump shaft; a sleeve is provided on the pump shaft, one end of the sleeve abuts against the first wheel body, and the other end abuts against the step; a mechanical seal is used between the pump cover and the sleeve; the mechanical seal includes a stationary ring assembly and a dynamic ring assembly, the stationary ring assembly is connected and fixed to the pump cover, the stationary ring assembly is sleeved on the sleeve, the dynamic ring assembly is arranged between the stationary ring assembly and the first wheel body, and the dynamic ring assembly is sleeved on the sleeve; an oil channel is provided on the pump cover.

[0016] In some embodiments of the present application, a second cavity is provided on the pump body, the second cavity is connected to the first cavity, the first opening and the second cavity are respectively arranged on both sides of the hydraulic impeller, and part of the pump shaft is arranged in the second cavity; the cross-section of the second cavity is circular; the maximum diameter of the second cavity is smaller than the diameter of the first wheel body.

[0017] In some embodiments of the present application, the cross-section of the first blade includes a first arc group that is recessed inward, and the first arc group is symmetrically arranged on both sides; the angle between the tangent on one side of the first arc group and the tangent on the other side that is symmetrical gradually decreases as the tangent point moves from the center to both sides; the cross-section of the first blade includes a second arc group that is protruding outward, and the second arc group is symmetrically arranged on both sides; the second arc group is equidistant from the first arc group; the first arc group is connected to the first wheel body through a third arc group, and the third arc group is recessed inward; the ratio of the recess depth of the first arc group to the width of the first arc group is 0.4-0.5; the ratio of the thickness of the first blade to the height of the first blade is 0.5.

[0018] A hydraulic fan obtained by the present invention includes the above-mentioned hydraulic driver and a fan assembly, the fan assembly includes a wind impeller, and the wind impeller is connected to the pump shaft; the fan assembly also includes a shell, the shell is provided with a fan guide vane, and the wind impeller is arranged between the fan guide vane and the pump cover; the shell is cylindrical, and the wind impeller is arranged in the shell.

[0019] In some embodiments of the present application, a bearing box is provided between the pump cover and the wind impeller, one end of the bearing box is connected to the pump cover, and the other end is provided with a bearing cover, the bearing cover and the bearing box are detachably connected, a third opening is provided on the bearing cover, and the pump shaft is passed through the third opening; a bearing is provided between the pump shaft and the bearing box, and both sides of the bearing are respectively abutted against the pump shaft and the bearing box; a first mounting foot extending outward is provided on the pump body; a second mounting foot is provided on the shell; and a support frame is also included, and the first mounting foot and the second mounting foot are both connected and fixed to the support frame.

[0020] In some embodiments of the present application, the wind impeller includes a second wheel body and at least two groups of wind blades, adjacent wind blades are arranged at intervals along the radial direction of the second wheel body, the wind blades are connected to the second wheel body, and the second wheel body is connected to the pump shaft.

[0021] Furthermore, the fan guide vane includes a third wheel body and a guide vane group, the outer end of the guide vane group is fixedly connected to the shell, and the third wheel body is connected to the outermost guide vane group; the number of guide vane groups is the same as the number of wind blade groups; the wind blade groups and the guide vane groups are arranged at intervals; the diameter of the second wheel body is the same as the diameter of the third wheel body.

[0022] Furthermore, the shell includes an upper shell and a lower shell, and the upper shell and the lower shell are relatively disassembled; the third wheel body includes an upper wheel body and a lower wheel body, and the upper wheel body and the lower wheel body are relatively disassembled, the upper wheel body is connected to the upper shell, and the lower wheel body is connected to the lower shell; part of the guide vane group is arranged between the upper wheel body and the upper shell, and the remaining part is arranged between the lower wheel body and the lower shell.

[0023] Furthermore, the radial projections of adjacent wind blade groups along the second wheel body all overlap; the wind blade group includes a second blade, the width of the second blade gradually decreases from the center to the outer end, and the second blade is evenly distributed around the second wheel body; the radial projections of adjacent guide vane groups along the third wheel body all overlap; the guide vane group includes a third blade, and the third blade is evenly distributed around the third wheel body; the ratio of the innermost diameter of the second blade to the outermost diameter of the second blade is 1:4.

[0024] The hydraulic fan obtained by the present invention has a hydraulic driver and a wind impeller integrated into one, and has the advantages of high pressure, low flow, large air volume, low wind pressure and high static pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0026] Figure 2 is a top view of embodiment 1 of the present invention;

[0027] Figure 3 yes Figure 2 The rotated cross-sectional view in the AA direction;

[0028] Figure 4 yes Figure 2 Sectional view in the middle BB direction;

[0029] Figure 5 is a schematic structural diagram of a hydraulic impeller of Embodiment 1 of the present invention;

[0030] Figure 6 is a streamline distribution diagram of Example 1 of the present invention;

[0031] Figure 7 Schematic diagram of the internal flow of the hydraulic impeller of Example 1 of the present invention;

[0032] Figure 8 is a schematic diagram of energy loss caused by the collision between the axial vortex and the first blade in Example 1 of the present invention;

[0033] Fig. 9 Schematic diagram of energy loss caused by the collision between the longitudinal vortex and the first wheel body in Example 1 of the present invention;

[0034] Fig.10 is a schematic structural diagram of Embodiment 2 of the present invention;

[0035] Fig.11 is a cross-sectional view of embodiment 2 of the present invention;

[0036] Fig.12 is a schematic diagram of the structure of Embodiment 3 of the present invention;

[0037] Fig.13is a cross-sectional view of embodiment 3 of the present invention;

[0038] Fig.14 is a schematic structural diagram of a wind impeller according to Embodiment 3 of the present invention;

[0039] Fig.15 is a schematic structural diagram of a housing according to Embodiment 3 of the present invention;

[0040] Fig.16 is a velocity vector diagram of the blades of the two-stage series structure under rated conditions of embodiment 3 of the present invention;

[0041] Fig.17 It is the velocity streamline diagram of the two-stage series structure under rated conditions of Example 3 of the present invention.

[0042] In the figure: 1, pump body; 2, first cavity; 3, first opening; 4, water inlet; 5, water outlet; 6, pump cover; 7, hydraulic impeller; 8, pump shaft; 9, second opening; 10, first wheel body; 11, first blade; 12, water inlet cavity; 13, first surface; 14, second surface; 15, water inlet pipe; 16, water inlet channel; 17, conical surface; 18, water outlet pipe; 19, water outlet channel; 20, step; 21, shaft sleeve; 22, stationary ring assembly; 23, dynamic ring assembly; 24, oil channel; 25, second cavity; 26, fan unit Components; 27, wind impeller; 28, shell; 29, fan guide vane; 30, bearing box; 31, bearing cover; 32, third opening; 33, bearing; 34, first mounting foot; 35, second mounting foot; 36, support frame; 37, second wheel body; 38, fan blade group; 39, third wheel body; 40, guide vane group; 41, upper shell; 42, lower shell; 43, upper wheel body; 44, lower wheel body; 45, second blade; 46, third blade; 111, first arc group; 112, second arc group; 113, third arc group. DETAILED DESCRIPTION

[0043] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0044] Embodiment 1:

[0045] This embodiment provides a hydraulic drive, such as Figure 1-Figure 4 As shown, including:

[0046] The pump body 1 is provided with a first cavity 2 with a circular cross section, the first cavity 2 is provided with a first axial opening 3, and the cavity wall of the first cavity 2 is provided with a water inlet 4 and a water outlet 5;

[0047] A pump cover 6, used for sealing the first opening 3 and detachably connected to the pump body 1;

[0048] A hydraulic impeller 7 is rotatably disposed in the first cavity 2 and is coaxially arranged with the first cavity 2;

[0049] A pump shaft 8 connected to a hydraulic impeller 7;

[0050] The pump cover 6 is provided with a second axial opening 9, and the pump shaft 8 is passed through the second opening 9; the hydraulic impeller 7 includes a first wheel body 10 and a first blade 11; the extension direction of the water inlet 4 is perpendicular to the radial direction of the highest point of the hydraulic impeller 7, and the center height of the water inlet 4 is located at a quarter to a half of the first blade 11 from the outside to the inside when it rotates to the highest point; the height of the lower end of the water outlet 5 is located at a quarter to a half of the first blade 11 from the outside to the inside when it rotates to the lowest point, and the height of the upper end of the water outlet 5 is not higher than the height of the center of the hydraulic impeller 7. The highest point of the water inlet 4 is not higher than the top of the first blade 11 when it rotates to the highest point, and the lowest point of the water inlet 4 is not lower than the highest point of the first wheel body 10; the water inlet 4 and the water outlet 5 are arranged up and down relative to the pump shaft 8 and are set on the same side, and the water inlet 4 is above the pump shaft 8. In this embodiment, the height of the upper end of the water outlet 5 is the same as the height of the center of the hydraulic impeller 7.

[0051] The extension direction of the water inlet 4 is perpendicular to the radial direction of the highest point of the hydraulic impeller 7, so that the water flow in the first cavity 2 can vertically push the highest first blade 11, and the first blade located below the highest first blade 11 and close to the water inlet 4 can also be pushed toward the highest first blade 11. The energy utilization rate of the water flow is high, and the water inlet height is at one-fourth to one-half of the first blade 11 from the outside to the inside at the highest point, so that the main point where the first blade 11 is pushed is at the upper half of the first blade 11, and the lever arm is long, which is convenient for driving the hydraulic impeller 7 to rotate, and can make most of the water flow in the first cavity 2 push the first blade 11, and part of the water flow in the first blade 11 will not impact the first blade 11 due to the excessively long lever arm. The outlet 5 has a large opening range, which is convenient for water to flow out. The lower end height of the outlet 5 can be higher than the lowest point of the first blade 11, so that its energy utilization rate for the water flow is high. When the first blade 11 is at the lowest point, the gravitational potential energy has just been fully converted, and the water flow still has a large impact force. By continuing to push the first blade 11 up, the energy of the water flow is further reduced, the energy utilization rate is improved, and the impact force on the outlet 5 is reduced at the same time; the inlet 4 and the outlet 5 are arranged on the same side, the water flow impact distance is long, the energy utilization rate is high, and the solid part filled with water flow is large. The distance between the inlet 4 and the outlet 5 is small, and the space with sparse water flow is small, which can effectively prevent vibration and improve the operation stability. When in use, the inlet water flow pushes the first blade 11, so that the hydraulic impeller 7 rotates, and the hydraulic impeller 7 drives the pump shaft 8 to rotate, so that the pump shaft 8 outputs power to the outside.

[0052] In order to ensure reliable water inlet, the water inlet 4 is a circular hole; the diameter of the water inlet 4 is the same as the thickness of the first blade 11; the center of the water inlet 4 and the midpoint of the thickness of the first blade 11 are on the same plane. The circular hole-shaped water inlet 4 has more concentrated water inlet energy; the diameter of the water inlet 4 is the same as the thickness of the first blade 11, so that most of the incoming water flow reaches the first blade 11, reducing energy loss.

[0053] In order to ensure reliable water discharge, the cross section of the water outlet 5 is rectangular; the thickness of the water outlet 5 is greater than the thickness of the first blade 11; the cross-sectional area of ​​the water outlet 5 gradually decreases from the inside to the outside; the bottom surface of the water outlet 5 directly connected to the first cavity 2 is parallel to the horizontal plane. The rectangular cross-sectional water outlet 5 increases the water discharge area and is more convenient for water discharge; the thickness of the water outlet 5 is also the width of the water outlet 5. The large width of the water outlet 5 allows the water flow brought by the first blade 11 to directly enter the water outlet 5, reducing the collision between the water flow driven by the first blade 11 and the cavity wall, reducing energy loss; the cross-sectional area of ​​the water outlet 5 gradually decreases from the inside to the outside, which can increase the water discharge pressure and facilitate the output of water flow; the bottom surface of the water outlet 5 connected to the first cavity 2 is a horizontal plane, which is convenient for the transportation of water flow, and part of the water flow can just flow out horizontally after pushing the lowest point first blade 11 up.

[0054] For stable operation, a water inlet cavity 12 is provided on the first cavity 2, and the water inlet cavity 12 includes a first surface 13 and a second surface 14 which are perpendicular to each other, the second surface 14 is tangent to the highest point of the first cavity 2, and the water inlet 4 is provided on the first surface 13. Part of the water flow will diffuse and move in the opposite direction after impacting the first blade 11, which will affect the continuous impact of the subsequent water flow on the first blade 11 in a narrow space. The design of the water inlet cavity 12 enables this part of the water flow to diffuse into the water inlet cavity 12 without directly affecting the subsequent water flow, thereby improving the stability of operation.

[0055] In order to ensure reliable water inlet, the pump body 1 is provided with an outwardly extending water inlet pipe 15, and the water inlet pipe 15 is provided with a water inlet channel 16, which is connected to the water inlet 4 through a conical surface 17, and the radial cross-sectional area of ​​the conical surface 17 gradually increases from the inside to the outside. The design of the water inlet pipe 15 facilitates the connection of the water inlet pipe; the cross-sectional area of ​​the water inlet channel 16 is larger than the cross-sectional area of ​​the water inlet 4 to ensure the water inlet flow; the design of the conical surface 17 increases the water inlet pressure, so that the pressure of the water inlet on the first blade 11 is greater, and the power is increased.

[0056] In order to ensure reliable water discharge, the pump body 1 is provided with a water outlet pipe 18 extending outward, and a water outlet channel 19 is provided on the water outlet pipe 18. The water outlet channel 19 is connected to the water outlet 5, and the radial cross-sectional area of ​​the water outlet channel 19 gradually increases from the inside to the outside. The design of the water outlet pipe 18 facilitates the connection of the water outlet pipe; the cross-sectional area of ​​the water outlet channel 19 is larger than the cross-sectional area of ​​the water outlet 5, so as to ensure the water discharge flow.

[0057] For reliable water inlet, the center height of the water inlet 4 is located at one third of the first blade 11 from the outside to the inside when it rotates to the highest point. Being set at one third can ensure a longer force arm and ensure that most of the inlet water flow is used to push the first blade 11.

[0058] For reliable water discharge, the height of the lower end of the water outlet 5 is located at one-third of the first blade 11 from the outside to the inside when it rotates to the lowest point. Being arranged at one-third can not only improve the energy utilization of the water flow, but also ensure that most of the water flows out.

[0059] In order to run more stably, the pump shaft 8 is provided with a step 20; the pump shaft 8 is sleeved with a sleeve 21, one end of the sleeve 21 abuts against the first wheel body 10, and the other end abuts against the step 20; a mechanical seal is used between the pump cover 6 and the sleeve 21; the mechanical seal includes a stationary ring assembly 22 and a dynamic ring assembly 23, the stationary ring assembly 22 is connected and fixed to the pump cover 6, the stationary ring assembly 22 is sleeved on the sleeve 21, the dynamic ring assembly 23 is set between the stationary ring assembly 22 and the first wheel body 10, and the dynamic ring assembly 23 is sleeved on the sleeve 21; an oil passage 24 is provided on the pump cover 6. The mechanical seal has good sealing performance; the oil passage 24 is connected to the outside world and the outer surface of the sleeve 21 respectively, which is convenient for oiling and lubrication.

[0060] The pump cover 6 and the pump body 1 are sealed by a sealing ring; the pump cover 6 is provided with a boss that matches the first opening 3, and the boss is inserted into the first opening 3, which has better sealing and higher installation accuracy; the shaft sleeve 21 and the pump shaft 8 are sealed by a sealing ring.

[0061] In order to make the operation more stable, the pump body 1 is provided with a second cavity 25, which is communicated with the first cavity 2, the first opening 3 and the second cavity 25 are respectively arranged on both sides of the hydraulic impeller 7, and part of the pump shaft 8 is arranged in the second cavity 25; the cross section of the second cavity 25 is circular; the maximum diameter of the second cavity 25 is smaller than the diameter of the first wheel body 10. The second cavity 25 is used to accommodate the pump shaft 8, so that both sides of the pump shaft 8 can extend out of the hydraulic impeller 7, and the rotation of the hydraulic impeller 7 is more stable; the maximum diameter of the second cavity 25 is smaller than the diameter of the first wheel body 10, which can prevent the water flow pushed by the first blade 11 from entering the second cavity 25 to cause energy waste.

[0062] To improve efficiency, Figure 5As shown, the cross section of the first blade 11 includes a first arc group 111 that is concave inwards, and the first arc group 111 is symmetrically arranged on both sides; the angle between the tangent on one side of the first arc group 111 and the tangent on the other side of the symmetry gradually decreases from the tangent point moving from the center to both sides; the cross section of the first blade 11 includes a second arc group 112 that is convex outwards, and the second arc group 112 is symmetrically arranged on both sides; the second arc group 112 is equidistantly arranged from the first arc group 111; the first arc group 111 is connected to the first wheel body 10 through the third arc group 113, and the third arc group 113 is concave inwards; the ratio of the concave depth of the first arc group 111 to the width of the first arc group 111 is 0.4-0.5; the ratio of the thickness of the first blade 11 to the height of the first blade 11 is 0.5. In this embodiment, the concave depth of the first arc group 111 is 2.4mm, and the width of the first arc group 111 is 5mm. The first arc group 111 , the second arc group 112 and the third arc group 113 may be a single arc or a connection of multiple arcs.

[0063] See also Figure 6 , Figure 6 is the flow line distribution diagram within the hydraulic actuator;

[0064] See also Figure 7 , Figure 7 is a schematic diagram of the internal flow of the hydraulic impeller 7;

[0065] See also Figure 8 , Figure 8 is a schematic diagram of energy loss caused by the collision between the axial vortex and the first blade 11;

[0066] See also Fig. 9 , Fig. 9 It is a schematic diagram of energy loss caused by the collision between the longitudinal vortex and the first wheel body 10.

[0067] Depend on Figure 6-Figure 9 It can be concluded from the simulation that the first blade 11 is in a three-dimensional twisted shape with a large inclination angle as a whole, mainly to strengthen the longitudinal vortex, thereby enhancing the energy exchange of the fluid outside the first blade 11 and the fluid inside the first blade 11, and reducing radial and axial vortex losses. The space between adjacent first blades 11 is a non-uniform cross-section, mainly to improve the flow change law from the water inlet 4 to the water outlet 5 and reduce the loss during energy exchange.

[0068] Embodiment 2:

[0069] This embodiment provides a hydraulic fan, such as Fig.10 , Fig.11As shown, it includes a hydraulic driver and a fan assembly 26 described in Example 1, the fan assembly 26 includes a wind impeller 27, and the wind impeller 27 is connected to the pump shaft 8; the fan assembly 26 also includes a housing 28, and a fan guide vane 29 is provided on the housing 28, and the wind impeller 27 is arranged between the fan guide vane 29 and the pump cover 6; the housing 28 is cylindrical, and the wind impeller 27 is arranged in the housing 28. The wind impeller 27 is used to rotate to generate wind power; the fan guide vane 29 is used to guide the wind power generated by the wind impeller 27; the housing 28 is cylindrical and has good adaptability to the wind impeller 27, and the wind impeller 27 is in the housing 28, which can concentrate the wind power generated by the wind impeller 27; the fan assembly 26 can be connected to the hydraulic driver to convert hydraulic power into wind power, with large wind volume and low wind pressure, and no electric power is required to drive the fan assembly 26, which is convenient for use in explosion-proof places such as mines.

[0070] In order to ensure reliable connection between the hydraulic drive and the fan assembly 26, a bearing box 30 is provided between the pump cover 6 and the wind impeller 27. One end of the bearing box 30 is connected to the pump cover 6, and the other end is provided with a bearing cover 31. The bearing cover 31 is detachably connected to the bearing box 30. The bearing cover 31 is provided with a third opening 32, and the pump shaft 8 is inserted through the third opening 32. A bearing 33 is provided between the pump shaft 8 and the bearing box 30. The two sides of the bearing 33 are respectively in contact with the pump shaft 8 and the bearing box 30. The bearing 33 is arranged at both ends of the bearing box 30. The design of the bearing box 30 can improve the protection and prevent debris from entering and contacting the pump shaft 8. The design of the bearing 33 can make the rotation of the pump shaft 8 smoother, and the bearing box 30 supports the bearing 33, thereby supporting the pump shaft 8.

[0071] In order to facilitate installation, the pump body 1 is provided with a first mounting foot 34 extending outward; the housing 28 is provided with a second mounting foot 35; and a support frame 36 is also included, and the first mounting foot 34 and the second mounting foot 35 are both connected and fixed to the support frame 36. The design of the first mounting foot 34 facilitates the installation and fixation of the hydraulic driver; the design of the second mounting foot 35 facilitates the installation and fixation of the fan assembly 26; the design of the support frame 36 fixes the hydraulic driver and the fan assembly 26 as a whole, and the error during the installation of the hydraulic driver and the fan assembly 26 is small, and the overall strength is high. The overall installation and fixation can be completed by fixing the support frame 36, which is convenient for installation on the construction site.

[0072] Embodiment 3:

[0073] This embodiment provides a hydraulic fan, such as Fig.12 , Fig.13As shown, in addition to the features described in Example 2, in order to increase the wind volume, the wind impeller 27 includes a second wheel body 37 and at least two groups of wind blade groups 38, adjacent wind blade groups 38 are arranged at intervals along the radial direction of the second wheel body 37, and the wind blade groups 38 are connected to the second wheel body 37, and the second wheel body 37 is connected to the pump shaft 8. In this embodiment, two groups of wind blade groups 38 are provided. The design of two groups of wind blade groups 38 can increase the wind force, and ensure that the hydraulic fan has a small volume and a high static pressure.

[0074] In order to guide the wind reliably, the fan guide vane 29 includes a third wheel body 39 and a guide vane group 40. The outer end of the guide vane group 40 is fixedly connected to the housing 28, and the third wheel body 39 is connected to the outermost guide vane group 40; the number of the guide vane groups 40 is the same as the number of the wind blade groups 38; the wind blade groups 38 and the guide vane groups 40 are arranged at intervals; the diameter of the second wheel body 37 is the same as the diameter of the third wheel body 39. The wind blade groups 38 and the guide vane groups 40 are arranged at intervals, so that the guide vane group 40 guides the airflow from each wind blade group 38 to ensure uniform flow of the airflow; the diameter of the second wheel body 37 is the same as the diameter of the third wheel body 39, so that the third wheel body 39 will not block the air duct, and the connection with the second wheel body 37 is flat to ensure smooth airflow.

[0075] For ease of assembly, Fig.15 As shown, the housing 28 includes an upper housing 41 and a lower housing 42, and the upper housing 41 and the lower housing 42 are relatively detachable; the third wheel body 39 includes an upper wheel body 43 and a lower wheel body 44, and the upper wheel body 43 and the lower wheel body 44 are relatively detachable, the upper wheel body 43 is connected to the upper housing 41, and the lower wheel body 44 is connected to the lower housing 42; part of the guide vane group 40 is arranged between the upper wheel body 43 and the upper housing 41, and the remaining part is arranged between the lower wheel body 44 and the lower housing 42; the upper housing 41 and the lower housing 42 are connected by bolts. The fan blade group 38 and the guide vane group 40 are arranged at intervals from each other, making it difficult to install the fan blade group 38 and the guide vane group 40. The upper housing 41 and the lower housing 42 are relatively detachable, which can facilitate the assembly of the fan blade group 38 and the guide vane group 40. The guide vane group 40 is divided into two parts with the upper housing 41 and the lower housing 42, and can be put on the wind impeller 27 from both sides for easy installation.

[0076] In order to improve the wind guiding effect, Fig.14As shown, the radial projections of adjacent wind blade groups 38 along the second wheel body 37 are all overlapped, that is, the sizes and angles of adjacent second blades 45 in the radial direction of the second wheel body 37 are all the same, and all wind blade groups 38 rotate coaxially, which can reduce the influence between the wind blade groups 38; the wind blade group 38 includes a second blade 45, the width of the second blade 45 gradually decreases from the center to the outer end, and the second blade 45 is evenly distributed around the second wheel body 37; the radial projections of adjacent guide vane groups 40 along the third wheel body 39 are all overlapped, that is, the sizes and angles of adjacent third blades 46 in the radial direction of the third wheel body 39 are all the same, which can reduce the influence between the guide vane groups 40 and ensure the wind guiding effect; the guide vane group 40 includes a third blade 46, and the third blade 46 is evenly distributed around the third wheel body 39; the ratio of the innermost diameter of the second blade 45 to the outermost diameter of the second blade 45 is 1:4.

[0077] Rated operating conditions: flow rate 603m3 / h, wind pressure 121.2Pa, static pressure 89.3Pa, speed 1950rpm, aerodynamic efficiency 61.4%.

[0078] See also Fig.16 , Fig.16 It is the velocity vector diagram of the blades of the two-stage series structure under rated working conditions. It can be seen from the figure that the flow velocity distribution between the rotor blades after the impeller is unfolded can be found that the meridian plane and the flow field between the blades are relatively uniform, and no secondary flow structure appears;

[0079] See also Fig.17 , Fig.17 This is the velocity streamline diagram of the two-stage series structure under rated working conditions. It can be seen from the figure that there is no obvious bypass phenomenon;

[0080] In this embodiment, a two-stage series structure is used, with two fan blade groups 38 and two guide vane groups 40 respectively provided. The fan blade groups 38 and the guide vane groups 40 are arranged in series, which can increase the static pressure of the product and avoid the situation where the local load is too large. The hydraulic drive is integrated with the wind impeller 27, and has the advantages of high pressure, low flow, large air volume, low wind pressure and high static pressure.

[0081] Of course, there can be multiple fan blade groups 38 and guide vane groups 40, and multiple fan blade groups 38 and guide vane groups 40 are arranged in series.

[0082] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A hydraulic drive, characterized in that: include: The pump body (1) is provided with a first cavity (2) with a circular cross section, the first cavity (2) is provided with a first axial opening (3), and the cavity wall of the first cavity (2) is provided with a water inlet (4) and a water outlet (5); A pump cover (6), used for sealing the first opening (3) and detachably connected to the pump body (1); A hydraulic impeller (7) is rotatably disposed in the first cavity (2) and is coaxially arranged with the first cavity (2); A pump shaft (8) connected to the hydraulic impeller (7); The pump cover (6) is provided with an axial second opening (9), and the pump shaft (8) is inserted into the second opening (9); the hydraulic impeller (7) comprises a first wheel body (10) and a first blade (11); the extension direction of the water inlet (4) is perpendicular to the radial direction of the highest point of the hydraulic impeller (7); the center height of the water inlet (4) is located at a position from one quarter to one half of the first blade (11) when the water inlet rotates to the highest point from the outside to the inside; the height of the lower end of the water outlet (5) is located at a position from one quarter to one half of the first blade (11) when the water inlet rotates to the lowest point ) from the outside to the inside at a quarter to a half, the height of the upper end of the water outlet (5) is not higher than the height of the center of the hydraulic impeller (7); the water inlet (4) and the water outlet (5) are arranged up and down relative to the pump shaft (8) and are arranged on the same side, and the water inlet (4) is above the pump shaft (8); the water inlet (4) is a circular hole; the pump body (1) is provided with a water inlet pipe (15) extending outward, and the water inlet pipe (15) is provided with a water inlet channel (16), and the water inlet channel (16) is connected to the water inlet (4).

2. A hydraulic actuator according to claim 1, characterized in that: The diameter of the water inlet (4) is the same as the thickness of the first blade (11); the center of the water inlet (4) and the midpoint of the thickness of the first blade (11) are located on the same plane; the cross section of the water outlet (5) is rectangular; the thickness of the water outlet (5) is greater than the thickness of the first blade (11); the cross-sectional area of ​​the water outlet (5) decreases gradually from the inside to the outside; and the bottom surface of the water outlet (5) directly connected to the first cavity (2) is parallel to the horizontal plane.

3. A hydraulic driver according to claim 1, characterized in that: The first cavity (2) is provided with a water inlet cavity (12), the water inlet cavity (12) comprises a first surface (13) and a second surface (14) which are perpendicular to each other, the second surface (14) is tangent to the highest point of the first cavity (2), and the water inlet (4) is arranged on the first surface (13).

4. A hydraulic driver according to claim 1, characterized in that: The water inlet channel (16) is connected to the water inlet (4) via a conical surface (17), and the radial cross-sectional area of ​​the conical surface (17) gradually increases from the inside to the outside. The pump body (1) is provided with a water outlet pipe (18) extending outward, and the water outlet pipe (18) is provided with a water outlet channel (19), which is connected to the water outlet (5), and the radial cross-sectional area of ​​the water outlet channel (19) gradually increases from the inside to the outside.

5. A hydraulic driver according to claim 1, characterized in that: The center height of the water inlet (4) is located at one third of the distance from the outside to the inside of the first blade (11) when it rotates to the highest point; the height of the lower end of the water outlet (5) is located at one third of the distance from the outside to the inside of the first blade (11) when it rotates to the lowest point.

6. A hydraulic driver according to claim 1, characterized in that: The pump shaft (8) is provided with a step (20); a shaft sleeve (21) is sleeved on the pump shaft (8), one end of the shaft sleeve (21) abuts against the first wheel body (10), and the other end abuts against the step (20); a mechanical seal is used between the pump cover (6) and the shaft sleeve (21); the mechanical seal comprises a stationary ring assembly (22) and a dynamic ring assembly (23), the stationary ring assembly (22) is connected and fixed to the pump cover (6), the stationary ring assembly (22) is sleeved on the shaft sleeve (21), the dynamic ring assembly (23) is arranged between the stationary ring assembly (22) and the first wheel body (10), and the dynamic ring assembly (23) is sleeved on the shaft sleeve (21); an oil passage (24) is provided on the pump cover (6).

7. A hydraulic actuator according to claim 1, characterized in that: The pump body (1) is provided with a second cavity (25), the second cavity (25) is communicated with the first cavity (2), the first opening (3) and the second cavity (25) are respectively arranged on both sides of the hydraulic impeller (7), and part of the pump shaft (8) is arranged in the second cavity (25); the cross section of the second cavity (25) is circular; and the maximum diameter of the second cavity (25) is smaller than the diameter of the first impeller (10).

8. A hydraulic actuator according to claim 1, characterized in that: The cross section of the first blade (11) comprises a first arc group (111) that is concave inwards, and the first arc group (111) is symmetrically arranged on both sides; the angle between the tangent on one side of the first arc group (111) and the tangent on the other side that is symmetrical gradually decreases from the tangent point moving from the center to both sides; the cross section of the first blade (11) comprises a second arc group (112) that is convex outwards, and the second arc group (112) is symmetrically arranged on both sides; the second arc group (112) and the first arc group (111) are arranged equidistantly; the first arc group (111) is connected to the first wheel body (10) through a third arc group (113), and the third arc group (113) is concave inwards; the ratio between the concave depth of the first arc group (111) and the width of the first arc group (111) is 0.4-0.5; the ratio between the thickness of the first blade (11) and the height of the first blade (11) is 0.

5.

9. A hydraulic fan, characterized in that: The invention comprises a hydraulic driver and a fan assembly (26) as claimed in any one of claims 1 to 8, wherein the fan assembly (26) comprises a wind impeller (27), and the wind impeller (27) is connected to a pump shaft (8); the fan assembly (26) further comprises a housing (28), a fan guide vane (29) is provided on the housing (28), and the wind impeller (27) is arranged between the fan guide vane (29) and the pump cover (6); the housing (28) is cylindrical, and the wind impeller (27) is arranged in the housing (28).

10. A hydraulic fan according to claim 9, characterized in that: A bearing box (30) is provided between the pump cover (6) and the wind impeller (27); one end of the bearing box (30) is connected to the pump cover (6), and the other end is provided with a bearing cover (31); the bearing cover (31) and the bearing box (30) are detachably connected; a third opening (32) is provided on the bearing cover (31), and the pump shaft (8) is inserted through the third opening (32); a bearing (33) is provided between the pump shaft (8) and the bearing box (30), and two sides of the bearing (33) are respectively in contact with the pump shaft (8) and the bearing box (30); a first mounting foot (34) extending outward is provided on the pump body (1); a second mounting foot (35) is provided on the housing (28); and a support frame (36) is also included, and the first mounting foot (34) and the second mounting foot (35) are both connected and fixed to the support frame (36).

11. A hydraulic fan according to claim 9, characterized in that: The wind impeller (27) comprises a second wheel body (37) and at least two groups of wind blade groups (38), wherein adjacent wind blade groups (38) are arranged at intervals along the radial direction of the second wheel body (37), the wind blade groups (38) are connected to the second wheel body (37), and the second wheel body (37) is connected to the pump shaft (8).

12. A hydraulic fan according to claim 11, characterized in that: The fan guide vane (29) comprises a third wheel body (39) and a guide vane group (40); the outer end of the guide vane group (40) is fixedly connected to the housing (28); the third wheel body (39) is connected to the outermost guide vane group (40); the number of the guide vane groups (40) is the same as the number of the wind blade groups (38); the wind blade groups (38) and the guide vane groups (40) are arranged at intervals; and the diameter of the second wheel body (37) is the same as the diameter of the third wheel body (39).

13. A hydraulic fan according to claim 12, characterized in that: The shell (28) comprises an upper shell (41) and a lower shell (42), and the upper shell (41) and the lower shell (42) are relatively detachable; the third wheel body (39) comprises an upper wheel body (43) and a lower wheel body (44), and the upper wheel body (43) and the lower wheel body (44) are relatively detachable, the upper wheel body (43) is connected to the upper shell (41), and the lower wheel body (44) is connected to the lower shell (42); part of the guide vane group (40) is arranged between the upper wheel body (43) and the upper shell (41), and the remaining part is arranged between the lower wheel body (44) and the lower shell (42).

14. A hydraulic fan according to claim 12, characterized in that: The projections of adjacent fan blade groups (38) along the radial direction of the second wheel body (37) are all overlapped; the fan blade group (38) includes a second blade (45), the width of the second blade (45) gradually decreases from the center to the outer end, and the second blade (45) is evenly distributed around the second wheel body (37); the projections of adjacent guide vane groups (40) along the radial direction of the third wheel body (39) are all overlapped; the guide vane group (40) includes a third blade (46), and the third blade (46) is evenly distributed around the third wheel body (39); the ratio of the innermost diameter of the second blade (45) to the outermost diameter of the second blade (45) is 1:4.

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