Axially split pump impeller and axially split pump

Abstract

The utility model relates to the technical field of axially split pumps, in particular to an axially split pump impeller and an axially split pump. The axially split pump impeller comprises a front cover plate, a hub and a plurality of blades, the hub is arranged in the front cover plate, the blades are arranged between the hub and the front cover plate, and the blades are evenly arranged around the axis of the hub; one side, close to the center of the hub, of each blade is an inlet side, and the other side of each blade is an outlet side; each blade is provided with a suction surface and a pressure surface which are opposite to each other, and a flow channel is formed between the suction surface of one blade and the pressure surface of the adjacent blade; and a bent part is formed at one end, close to the inlet edge, of each blade along the width direction of the blade. According to the axially split pump impeller, the local cavitation phenomenon of the suction surfaces of the blades close to the inlets of the adjacent blades can be greatly relieved, and the cavitation resistance of the impeller is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of split case pumps, in particular to a split case pump impeller and a split case pump. Background Art

[0002] Anti-cavitation performance is one of the important performance indicators of water pumps. The quality of anti-cavitation performance not only affects the actual application scenarios of water pumps, but also plays a decisive role in the safe and stable operation of water pumps. On the premise of ensuring that the efficiency reaches the expected level, further improving the anti-cavitation performance of water pumps has become an important part of water pump design and optimization.

[0003] The fundamental reason for cavitation is that the local pressure of the fluid is too low when it flows in the flow channel. When the local pressure is lower than the vaporization pressure of the fluid at that temperature, cavitation will occur. Once cavitation occurs, the efficiency of the split pump will be affected during operation. In severe cases, it will cause flow interruption and the pump will not be able to continue working. At the same time, cavitation will also cause great damage to the components. Long-term cavitation will significantly shorten the service life of the corresponding components.

[0004] At present, in the impeller of the split case pump, a flow channel is formed between the pressure surface of one blade and the suction surface of the other blade in two adjacent blades. The local area formed by the pressure surface side of the blade inlet and the suction surface of the adjacent blade is the narrowest part of the entire inter-leaf flow channel, and the local flow velocity is relatively large, which will cause the local pressure of the flow channel to be too low, and cavitation is very likely to occur. Utility Model Content

[0005] (I) The problem to be solved by the utility model is that in the impeller of a split pump, the front end of the flow channel formed between adjacent blades is prone to cavitation due to the high flow velocity and low pressure.

[0006] (II) Technical solution

[0007] A split pump impeller comprises a front cover plate, a hub and a plurality of blades, wherein the hub is arranged inside the front cover plate, the plurality of blades are arranged between the hub and the front cover plate, and the plurality of blades are evenly arranged around the axis of the hub;

[0008] One side of the blade close to the center of the hub is the inlet side, and the other side is the outlet side;

[0009] The blade has a suction surface and a pressure surface opposite to each other, and a flow channel is formed between the suction surface of one blade and the pressure surface of an adjacent blade;

[0010] A curved portion is formed along the width direction of the blade at one end close to the inlet edge to expand the flow area between the end of the blade close to the inlet edge and an adjacent blade, and the curved portion on the blade is bent toward the pressure surface of the blade.

[0011] According to an embodiment of the utility model, the inlet edge of the blade is an arc-shaped edge, and the inlet edge protrudes toward the incoming flow direction.

[0012] According to an embodiment of the utility model, along the width direction of the blade, the protruding vertex of the inlet edge toward the incoming flow direction is located in the middle of the width of the blade.

[0013] According to an embodiment of the utility model, the impeller has two impeller inlets in the axial direction, and the impeller is provided with a plurality of impeller outlets in the radial direction.

[0014] According to an embodiment of the utility model, a mounting hole is provided at the center of the hub, and the mounting hole is used to be connected to the pump shaft.

[0015] According to an embodiment of the utility model, the inner walls at both ends of the mounting hole are respectively provided with keyways.

[0016] A split case pump comprises the split case pump impeller mentioned above.

[0017] Beneficial effects of the utility model:

[0018] The utility model provides a split pump impeller, comprising a front cover plate, a hub and a plurality of blades, wherein the hub is arranged inside the front cover plate, the plurality of blades are arranged between the hub and the front cover plate, and the plurality of blades are evenly arranged around the axis of the hub; one side of the blade close to the center of the hub is an inlet side, and the other side is an outlet side; the blade has a relative suction surface and a pressure surface, and a flow channel is formed between the suction surface of a blade and the pressure surface of an adjacent blade; a curved portion is formed along the width direction of the blade at one end close to the inlet side to expand the flow area between the end of the blade close to the inlet side and the adjacent blade, and the curved portion on the blade is curved toward the pressure surface of the blade.

[0019] Since a curved portion is formed along the width direction of the blade at one end close to the inlet edge, and the curved portion is curved toward the pressure surface of the blade, the flow area of ​​the flow channel between the blade end close to the inlet edge and the suction surface of the adjacent blade is increased, thereby greatly alleviating the local cavitation phenomenon at the suction surface of the blade close to the inlet of the adjacent blade, effectively improving the cavitation resistance of the impeller, and achieving the purpose of improving the cavitation resistance of the impeller by changing the local structural characteristics of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A three-dimensional diagram of an impeller provided in Embodiment 1 of the present utility model;

[0022] Figure 2 A front view of an impeller provided in Embodiment 1 of the utility model;

[0023] Figure 3 A cross-sectional view of an impeller provided in Embodiment 1 of the utility model;

[0024] Figure 4 A distribution diagram of blades in an impeller provided in Embodiment 1 of the utility model;

[0025] Figure 5 A first perspective view of a blade provided in Embodiment 1 of the utility model;

[0026] Figure 6 A second viewing angle diagram of the blade provided in the first embodiment of the utility model;

[0027] Figure 7 This is a third viewing angle diagram of the blade provided in the first embodiment of the utility model.

[0028] Icons: 1. Front cover; 101. Impeller outlet; 2. Hub; 201. Keyway; 3. Blades; 301. Inlet edge; 302. Outlet edge; 303. Suction side; 304. Pressure side. DETAILED DESCRIPTION

[0029] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] like Figure 1-Figure 7As shown, an embodiment of the utility model provides a split pump impeller, including a front cover plate 1, a hub 2 and a plurality of blades 3, the hub 2 is arranged inside the front cover plate 1, the plurality of blades 3 are arranged between the hub 2 and the front cover plate 1, and the plurality of blades 3 are evenly arranged around the axis of the hub 2; one side of the blade 3 close to the center of the hub 2 is an inlet edge 301, and the other side is an outlet edge 302; the blade 3 has a relative suction surface 303 and a pressure surface 304, and a flow channel is formed between the suction surface 303 of a blade 3 and the pressure surface 304 of an adjacent blade 3; a curved portion is formed along the width direction of the blade 3 at one end close to the inlet edge 301 to expand the flow area between the end of the blade 3 close to the inlet edge 301 and the adjacent blade 3, and the curved portion on the blade 3 is curved toward the pressure surface 304 of the blade 3.

[0031] In the present embodiment, a curved portion is formed along the width direction of the blade 3 at one end close to the inlet edge 301, and the curved portion is curved toward the pressure surface 304 of the blade 3, thereby increasing the flow area of ​​the flow channel between the end of the blade 3 close to the inlet edge 301 and the suction surface 303 of the adjacent blade 3, thereby greatly alleviating the local cavitation phenomenon at the suction surface 303 of the blade 3 close to the inlet of the adjacent blade 3, effectively improving the cavitation resistance of the impeller, and achieving the purpose of improving the cavitation resistance of the impeller by changing the local structural characteristics of the blade 3.

[0032] It needs to be explained that Figure 4 As shown, multiple blades 3 are provided, and multiple blades 3 are evenly arranged on the surface of the hub 2 around the axis of the hub 2 to form a windmill-like structure. Among two adjacent blades 3, a flow channel is formed between the pressure surface 304 of one blade 3 and the suction surface 303 of the other blade 3. The area formed by the pressure surface 304 side of the inlet edge 301 of the blade 3 and the suction surface 303 of the adjacent blade 3 is the narrowest part of the entire inter-blade flow channel, and the local flow velocity is relatively large, so it will cause the local pressure of the flow channel to be too low, which is very easy to cause cavitation.

[0033] In the present embodiment, a curved portion is formed by bending the end of the blade 3 close to the inlet edge 301 along its width direction, and the curved portion is bent toward the pressure surface 304 of the blade 3, thereby increasing the flow area at the front end of the flow channel and effectively improving the anti-cavitation performance of the impeller.

[0034] Specifically, Figure 5 , Figure 6 and Figure 7 As shown, the curved portion of the blade 3 formed near the inlet edge 301 is curved toward the pressure surface 304 of the blade 3, so that the end of the blade 3 near the inlet edge 301 expands outward, thereby increasing the flow area at the front end of the flow channel.

[0035] As a preferred embodiment, Figure 7 As shown, the inlet edge 301 of the blade 3 is an arc-shaped edge, and the inlet edge 301 protrudes in the incoming flow direction. Furthermore, along the width direction of the blade 3, the protruding vertex of the inlet edge 301 in the incoming flow direction is located in the middle of the width of the blade 3. Specifically, the protruding vertex is located at 1 / 3-2 / 3 of the width direction of the inlet edge 301 of the blade 3. By appropriately extending the inlet edge 301 of the blade 3, the blade 3 performs work on the conveying medium in advance, so that the energy of the medium is increased when flowing through the low pressure (i.e., the front end of the flow channel), which is conducive to alleviating the local cavitation phenomenon.

[0036] In this way, when the impeller is working, the conveying medium will flow into the flow channel from the front end of the flow channel. Since the flow area at the front end of the flow channel is increased, the local cavitation phenomenon at the suction surface 303 of the blade 3 close to the inlet of the adjacent blade 3 can be greatly alleviated, and the anti-cavitation performance of the impeller is effectively improved. In addition, because the inlet edge 301 of the blade 3 is appropriately extended forward in the incoming flow direction, the blade 3 performs work on the conveying medium in advance, so that the energy of the medium flowing through the low pressure is increased, and the local cavitation phenomenon is further alleviated.

[0037] It should be noted that the present blade 3 is a further improvement made on the basis of the traditional blade structure. Specifically, one end of the blade 3 located at the inlet edge 301 is bent in the width direction to form a curved portion, and the curved portion is bent toward the pressure surface 304 of the blade 3. In addition, the inlet edge 301 of the blade 3 is protruded toward the incoming flow direction, so that the inlet edge 301 is set as an arc edge. That is, the middle and rear part of the original blade remains unchanged as a whole, and only the front part of the blade 3 is appropriately adjusted. In this way, the external characteristics of the water pump (such as head and efficiency) remain basically unchanged, while the anti-cavitation performance of the impeller is improved. That is, while ensuring that the overall efficiency of the water pump is not affected, the anti-cavitation performance of the water pump is effectively improved.

[0038] As a preferred embodiment, Figure 1 , Figure 2 and Figure 3 As shown, there are two impeller inlets on both sides of the impeller axial direction, a plurality of blades 3 are evenly arranged between the hub 2 and the front cover plate 1, and a plurality of impeller outlets 101 are arranged in the radial direction of the impeller. When the double-suction impeller is working, the fluid is sucked in from the two impeller inlets and enters each flow channel of the impeller. The blades 3 do work on the liquid in the flow channel, so that the fluid flows out of the impeller from the impeller outlet 101.

[0039] It should be noted that if Figure 2 As shown, a mounting hole is provided at the center of the hub 2, and the mounting hole is used to connect with the pump shaft, and the impeller is driven to rotate through the pump shaft. Figure 2 As shown, keyways 201 are provided at the ports at both ends of the mounting hole to facilitate connection with the pump shaft.

[0040] Embodiment 2:

[0041] The second embodiment of the present utility model provides a split-center pump, which includes the split-center pump impeller provided in the first embodiment.

[0042] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A split pump impeller, characterized in that: The invention comprises a front cover plate (1), a wheel hub (2) and a plurality of blades (3), wherein the wheel hub (2) is arranged inside the front cover plate (1), the plurality of blades (3) are arranged between the wheel hub (2) and the front cover plate (1), and the plurality of blades (3) are evenly arranged around the axis of the wheel hub (2); One side of the blade (3) close to the center of the hub (2) is an inlet side (301), and the other side is an outlet side (302); The blade (3) has a suction surface (303) and a pressure surface (304) opposite to each other, and a flow channel is formed between the suction surface (303) of one blade (3) and the pressure surface (304) of an adjacent blade (3); A curved portion is formed along the width direction of one end of the blade (3) close to the inlet edge (301) to expand the flow area between the end of the blade (3) close to the inlet edge (301) and an adjacent blade (3); the curved portion on the blade (3) is curved toward the pressure surface (304) of the blade (3).

2. A split pump impeller according to claim 1, characterized in that: The inlet edge (301) of the blade (3) is an arc-shaped edge, and the inlet edge (301) protrudes toward the incoming flow direction.

3. A split pump impeller according to claim 2, characterized in that: Along the width direction of the blade (3), the protruding apex of the inlet edge (301) facing the incoming flow direction is located in the middle of the width of the blade (3).

4. A split pump impeller according to claim 1, characterized in that: The impeller is provided with two impeller inlets in the axial direction and a plurality of impeller outlets (101) in the radial direction.

5. A split pump impeller according to claim 4, characterized in that: A mounting hole is provided at the center of the wheel hub (2), and the mounting hole is used to be connected to the pump shaft.

6. A split-case pump impeller according to claim 5, characterized in that: The inner walls at both ends of the mounting hole are respectively provided with key slots (201).

7. A split case pump, characterized in that: The split case pump comprises a split case pump impeller as described in any one of claims 1-6.

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