Coupling structure of pump shaft and impeller and centrifugal pump

Abstract

The utility model discloses a connection structure of a pump shaft and an impeller and a centrifugal pump, a hub of the impeller is configured in a way that the end part matched with an inlet runner of the impeller is closed, the other end part is open, and a shaft groove used for being connected and matched with the pump shaft is formed, so that when the pump shaft is arranged in the shaft groove, the pump shaft cannot penetrate through the hub; meanwhile, the connecting end of the pump shaft is arranged in the shaft groove and is connected with the shaft groove through a fixed connecting piece, so that a connecting structure of the pump shaft and the impeller is integrally arranged in the shaft groove, an impeller nut cannot be formed in an inlet runner of the impeller, and the inlet runner structure of the impeller cannot be damaged; the end portion, matched with the inlet of the impeller, of the hub is closed, the hub and the rear cover plate can be connected and matched to form a flow channel partition plate in an inlet flow channel of the impeller according to the hydraulic performance requirement of the impeller, meanwhile, liquid in the impeller cannot leak into a shaft groove, and therefore the hydraulic performance of the impeller is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of centrifugal pumps, in particular to a connection structure between a pump shaft and an impeller for improving an impeller inlet flow channel of a small centrifugal pump. Background Art

[0002] Small centrifugal pumps can be used for the transportation and circulation of chemical liquids containing acid and alkali corrosive components, domestic water, industrial water, etc., and are widely used in electroplating, chemical industry, dyeing and finishing wastewater, waste gas and other industries. The basic principle of a centrifugal pump is to drive the impeller to rotate at high speed through the pump shaft, so that the liquid forms a centrifugal force inside the impeller, sucking the liquid from the pump inlet and then outputting it to the outlet. Therefore, the flow channel structure of the impeller in the centrifugal pump is particularly important.

[0003] The connection structure between the impeller and the pump shaft in a traditional small centrifugal pump is as follows: Figure 1 As shown, the end of the pump shaft 1' is arranged in the shaft hole 21' in the middle of the impeller 2', passing through the hub 22' of the impeller 1', and keyways are provided in the shaft hole 21' and on the outer wall of the pump shaft 1', so that the pump shaft 1' and the hub 22' can be connected by a key 3'. In order to fix the axial position of the pump shaft 1', an impeller nut 4' is provided on the end surface where the pump shaft 1' and the impeller 2' cooperate, so that the pump shaft 1' and the hub 22' are fixed, thereby connecting the pump shaft 1' and the impeller 2'.

[0004] However, in the connection structure between the traditional impeller and the pump shaft, the impeller nut 4' is arranged at the inlet of the impeller 2', and the structure of the impeller nut 4' is inconsistent with the hydraulic structure of the inlet of the impeller 2', resulting in a change in the inlet flow channel of the impeller 2', thereby reducing the hydraulic performance of the impeller when the centrifugal pump is actually running; at the same time, the pump shaft 1' passes through the impeller hub 22'. In order to fix the pump shaft 1', it is usually necessary to process the hub 22', resulting in damage to the structure of the hub 22', further damaging the inlet flow channel of the impeller 2'.

[0005] Therefore, how to effectively connect the impeller to the pump shaft to ensure the rotation performance of the impeller and the pump shaft while not affecting the inlet flow channel of the impeller, thereby improving the hydraulic performance of the impeller has become an urgent problem to be solved in this field. Utility Model Content

[0006] In view of the defects of the prior art, the purpose of the utility model is to provide a connection structure between a pump shaft and an impeller and a centrifugal pump, which can effectively connect the pump shaft and the impeller without affecting the inlet flow channel of the impeller, thereby improving the hydraulic performance of the impeller.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a connection structure between a pump shaft and an impeller.

[0008] One end of the impeller hub located inside the inlet flow channel is configured to be closed with an end portion that cooperates with the inlet flow channel of the impeller, and the other end forms an axial groove, and the transverse axis direction of the axial groove is consistent with the axis direction of the pump shaft so as to cooperate with the connecting end of the pump shaft and be fixedly connected through a fixed connecting piece.

[0009] Furthermore, the shaft walls on both sides of the connecting end are connected to the shaft groove via fixing screws.

[0010] Furthermore, the shaft walls on both sides of the connecting end are connected to the shaft groove via fixing screws, wherein a key is provided on one side of the shaft wall, and the key and the fixing screw are arranged in a staggered manner.

[0011] Furthermore, the fixing screw is flush with the outer edge of the hub.

[0012] Furthermore, the closed end of the hub extends along the inlet flow channel of the impeller, and is connected and cooperated with the rear cover plate of the impeller to form a flow channel partition.

[0013] Furthermore, the rear cover plate and the wheel hub are an integrated structure.

[0014] Furthermore, the rear cover plate and the wheel hub are split structures that cooperate with each other.

[0015] In order to achieve the above-mentioned purpose, the centrifugal pump provided by the utility model includes a pump body and a pump body assembly arranged in the pump body, and the pump body assembly includes the connection structure of the pump shaft and the impeller as described in the claims.

[0016] The coupling structure of the pump shaft and the impeller and the centrifugal pump provided by the utility model close the end where the impeller hub cooperates with the impeller inlet flow channel, and opens the other end so that a shaft groove is formed in the middle of the hub. When the pump shaft is set in the shaft groove, it will not penetrate the hub; at the same time, the pump shaft is connected in the shaft groove by a fixed connecting piece, so that the coupling structure of the pump shaft and the impeller is placed in the shaft groove as a whole, and an impeller nut will not be formed in the impeller inlet flow channel, thereby not damaging the inlet flow channel structure of the impeller; and because the end where the hub cooperates with the impeller inlet is closed, the hub and the rear cover plate can be connected and cooperated to form a flow channel partition in the inlet flow channel of the impeller according to the hydraulic performance requirements of the impeller, and at the same time, the liquid in the impeller will not leak into the shaft groove, thereby improving the hydraulic performance of the impeller. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0018] Figure 1 It is a schematic diagram of the connection structure between the existing pump shaft and the impeller;

[0019] Figure 2 A schematic diagram of a first embodiment of the coupling structure between a pump shaft and an impeller provided by the utility model;

[0020] Figure 3 A schematic diagram of a second embodiment of the connection structure between the pump shaft and the impeller provided by the utility model;

[0021] Figure 4 A schematic diagram of a third embodiment of the coupling structure between the pump shaft and the impeller provided by the utility model;

[0022] Reference numerals:

[0023] 1. Impeller; 11. Hub; 111. Closed end; 12. Shaft groove; 121. First groove wall; 122. Second groove wall; 13. Inlet flow channel; 131. First flow channel; 132. Second flow channel; 14. Front cover plate; 15. Rear cover plate; 16. Blade; 161. First blade; 162. Second blade;

[0024] 2. Pump shaft; 21. Connection end; 211. First shaft wall; 212. Second shaft wall;

[0025] 3. Fixed connector; 31. Fixed screw; 311. Screw hole; 32. Key; 321. First keyway; 322. Second keyway;

[0026] 4. Flow channel partition. DETAILED DESCRIPTION

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific illustrations.

[0028] See also Figures 2 to 4 , which is a schematic diagram of the pump shaft and impeller connection structure provided by the utility model.

[0029] As can be seen from the figure, in the connection structure of the pump shaft and the impeller in this example, the impeller 1 and the pump shaft 2 are connected and matched through the shaft groove 12 set on the hub 11 of the impeller 1, so that the pump shaft 2 does not pass through the hub 11 of the impeller 1 and will not affect the inlet flow channel 13 of the impeller 1.

[0030] The impeller 1 further includes a front cover plate 14, a rear cover plate 15 and blades 16. The front cover plate 14 and the rear cover plate 15 are connected to form an inner cavity capable of accommodating the blades 16. The blades 16 are arranged in the inner cavity. The hub 11 is arranged at the end of the rear cover plate 15 and connected to the blades 11, so that the liquid enters the impeller 1 from the end of the front cover plate 14 and flows to the blades 16. It can rotate at high speed with the blades 16, so that the path of the liquid flowing from the end of the front cover plate 14 to the blades 16 constitutes the inlet flow channel 13 of the impeller 1.

[0031] Furthermore, the hub 11 of the impeller 1 is connected to the pump shaft 2 so that the pump shaft 2 can drive the impeller 1 to rotate. In order to improve the hydraulic performance of the impeller 1, it is necessary to ensure that the flow path of the liquid in the inlet channel 13 is consistent with the structure of the inlet channel 13, that is, it is necessary to ensure that the structure of the inlet channel 13 is complete, and the connection between the impeller 1 hub 11 and the pump shaft 2 cannot affect the structure of the inlet channel 13.

[0032] Specifically, the hub 11 is configured to have a closed end that cooperates with the inlet flow channel 13 and an open end, thereby forming a shaft groove 12 in the hub 11 for connecting and cooperating with the pump shaft 2, and the transverse axis direction of the shaft groove 12 is consistent with the axis direction of the pump shaft 2, so that the connecting end 21 of the pump shaft 2 is arranged in the shaft groove 12 and connected to the shaft groove 12 through the fixed connecting member 3, so that the pump shaft 2 can drive the impeller 1 to rotate.

[0033] At the same time, the connection structure between the pump shaft 2 and the impeller 1 is placed in the shaft groove 12 as a whole, the pump shaft 2 will not pass through the hub 11, and the connecting end 21 of the pump shaft 2 will not be arranged in the inlet flow channel 13 of the impeller 1. It is not necessary to arrange an impeller nut in the inlet flow channel 13 for fixing the pump shaft 2 and the hub 11, so that the structure of the inlet flow channel 13 is intact and not affected, thereby improving the hydraulic performance of the impeller 1.

[0034] Furthermore, since the end of the hub 11 that cooperates with the inlet channel 13 forms a closed end 111, the liquid in the inlet channel 13 will not leak into the shaft groove 12, thereby improving the sealing of the impeller 1 and further improving the hydraulic performance of the impeller 1.

[0035] In order to illustrate the specific composition of this scheme, corresponding examples are given below.

[0036] Embodiment 1

[0037] See also Figure 2 , which shows the first embodiment of the pump shaft and impeller connection structure provided by the utility model.

[0038] In the first embodiment, the connection end 21 of the pump shaft 2 is disposed in the shaft groove 12 , and the fixed connection member 3 for connecting the connection end 21 and the shaft groove 12 is composed of a fixing screw 31 .

[0039] Specifically, screw holes 311 are preferably provided at corresponding positions in the middle of the first groove wall 121 and the second groove wall 122 on both sides of the shaft groove 12 and in the middle of the first shaft wall 211 and the second shaft wall 212 on both sides of the connecting end 21, so that the fixing screw 31 can respectively pass through the screw holes 311 on the first groove wall 121 and the first shaft wall 211, and the screw holes 311 on the second groove wall 122 and the second shaft wall 212 to fix the shaft groove 12 to the connecting end 21.

[0040] Therefore, the first shaft wall 211 and the second shaft wall 212 on both sides of the connecting end 21 are connected to the shaft groove 12 through the fixing screws 31, so that the pump shaft 2 and the wheel hub 11 are firmly connected.

[0041] Furthermore, the fixing screw 31 is preferably flush and smooth with the outer edge of the hub 11 so that the fixing screw 31 will not affect the arrangement of other components in the pump body.

[0042] Here, the size, length and number of the fixing screws 31 are not limited and can be adaptively adjusted according to specific circumstances.

[0043] In some embodiments, a plurality of fixing screws 31 are evenly distributed in the connection end 21 and the shaft groove 12 around the circumference of the pump shaft 2 to improve the connection stability between the pump shaft 2 and the impeller 1 .

[0044] Embodiment 2

[0045] See also Figure 3 , which shows the second embodiment of the pump shaft and impeller connection structure provided by the utility model.

[0046] In the second embodiment, the connection end 21 of the pump shaft 2 is disposed in the shaft groove 12 , and the fixed connection member 3 for connecting the connection end 21 and the shaft groove 12 is composed of a fixing screw 31 and a key 32 .

[0047] Specifically, a first key groove 321 is provided on the first groove wall 121 of the shaft groove 12, and a second key groove 322 is provided on the first shaft wall 211 of the connecting end 21 corresponding to the first groove wall 121, so that the key 32 can be set in the first key groove 321 and the second key groove 322, thereby connecting the first groove wall 121 of the shaft groove 12 and the first shaft wall 211 of the connecting end 21.

[0048] Furthermore, corresponding screw holes 311 are respectively provided on the first groove wall 121 of the shaft groove 12 and the first shaft wall 211 of the connecting end 21, and the screw holes 311 are staggered with the first key groove 321 and the second key groove 322, so that the fixing screw 31 and the key 32 are staggered with each other, providing space for each other's arrangement, and no collision occurs during installation, so that the fixing screw 31 can pass through the screw holes 311 on the first groove wall 121 and the first shaft wall 211 respectively.

[0049] Thus, the first shaft wall 211 of the connecting end 21 cooperates with the connecting shaft groove 12 through the fixing screw 31 and the key 32 , so that the key 32 can reduce the force of the fixing screw 31 in the circumferential direction when the impeller 1 rotates.

[0050] In order to further fix the axial position of the impeller 1, screw holes 311 are provided at corresponding positions in the middle of the second groove wall 122 of the shaft groove 12 and the middle of the second shaft wall 212 of the connecting end 21, so that the fixing screw 31 can pass through the screw holes 311 on the second groove wall 122 and the second shaft wall 212, thereby connecting the second groove wall 122 of the shaft groove 12 and the second shaft wall 212 of the connecting end 21, thereby connecting the shaft groove 12 with the other side of the connecting end 21 to fix the axial position of the impeller 1.

[0051] Therefore, the first shaft wall 211 of the connecting end 21 is connected to the shaft groove 12 through the fixing screw 31 and the key 32 and transmits torque to reduce the force on the fixing screw 31. The second shaft wall 212 of the connecting end 21 is connected to the shaft groove 12 through the fixing screw 31 to fix the axial position of the pump shaft 2 and the impeller 1, thereby improving the connection performance between the pump shaft 2 and the impeller 1, and the pump shaft 2 can stably drive the impeller 1 to rotate.

[0052] Furthermore, the fixing screw 31 is preferably flush with the outer edge of the hub 11 so that the fixing screw 31 does not affect the arrangement of other components in the pump body.

[0053] Here, the size, length and number of the fixing screws 31 are not limited and can be adaptively adjusted according to specific circumstances.

[0054] In some embodiments, a plurality of fixing screws 31 are evenly distributed in the connection end 21 and the shaft groove 12 around the circumference of the pump shaft 2 and are staggered with the key 32 to improve the connection stability between the pump shaft 2 and the impeller 1 .

[0055] Furthermore, there is no limitation on the setting positions of the key 32 and the fixing screw 31. In some embodiments, the key 32 can also be configured to be set between the second shaft wall 212 of the connecting end 21 and the second groove wall 122 of the shaft groove 12, and at the same time, fixing screws 31 staggered with the key 32 are set in the second shaft wall 212 of the connecting end 21 and the second groove wall 122 of the shaft groove 12, so that the second shaft wall 212 of the connecting end 21 is connected to the shaft groove 12 through the key 32 and the fixing screw 31. Correspondingly, the fixing screw 31 can be set between the first shaft wall 211 of the connecting end 21 and the first groove wall 121 of the shaft groove 12, so that the first shaft wall 211 of the connecting end 21 is connected to the shaft groove 12 through the fixing screw 31.

[0056] Embodiment 3

[0057] See also Figure 4 , which shows the third embodiment of the pump shaft and impeller connection structure provided by the utility model.

[0058] On the basis of Embodiment 1 and Embodiment 2, since the end of the hub 11 that cooperates with the inlet flow channel 13 forms a closed end 111, in order to improve the hydraulic performance of the impeller 1, the closed end 111 of the hub 11 is configured to extend along the inlet flow channel 13, and is connected to and cooperates with the rear cover plate 15 to form a flow channel partition 4, so that the flow channel partition 4 is arranged in the inlet flow channel 13, changing the structure of the inlet flow channel 13, thereby improving the hydraulic performance of the impeller 1.

[0059] Specifically, in the third embodiment, the hub 11 and the rear cover plate 15 are an integrated structure, and cooperate to form a conical flow channel partition 4, so that the inlet flow channel 13 is divided into N flow channels (N = the number of blades 16) by the front cover plate 14, the flow channel partition 4 and the blades 16, so that after the liquid enters the inlet flow channel 13, it is divided into N flow streams (N = the number of blades 16) by the flow channel partition 4, and enters the corresponding blades along the N flow channels respectively.

[0060] by Figure 4 The flow passages corresponding to the first blade 161 and the second blade 162 are shown as an example.

[0061] The inlet flow channel 13 is divided by the flow channel partition 4 into a first flow channel 131 and a second flow channel 132 extending to the first blade 161 and the second blade 162 respectively, so that after the liquid enters the inlet flow channel 13, it is divided into two flow streams by the flow channel partition 4 and enters the first blade 161 and the second blade 162 on both sides along the first flow channel 131 and the second flow channel 132 respectively, thereby improving the hydraulic performance of the impeller 1.

[0062] Here, the specific structural shape of the flow channel baffle 4 is not limited, and can be adaptively adjusted according to the hydraulic performance requirements of the impeller 1.

[0063] Furthermore, the rear cover plate 15 and the hub 11 may be configured as an integrated structure to improve the structural integrity of the impeller 1 , or may be configured as a split structure that cooperates with each other to facilitate maintenance of the rear cover plate 15 and the hub 11 .

[0064] The utility model also provides a centrifugal pump, comprising a pump body and a pump body assembly arranged in the pump body, wherein the pump body assembly comprises a connection structure of a pump shaft and an impeller formed by the above scheme.

[0065] Here, the pump body and pump body assembly of the centrifugal pump are prior art and should be well known to those skilled in the art, and will not be described in detail here.

[0066] The pump shaft and impeller connection structure and the centrifugal pump provided by the utility model adopt a semi-enclosed shaft groove 12 arranged on the hub 11 to cooperate with the pump shaft 2, so that the connection structure of the pump shaft 2 and the impeller 1 is placed in the shaft groove 12 as a whole, which will not affect the inlet flow channel structure of the impeller 1, thereby improving the hydraulic performance of the impeller 1.

[0067] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection of the utility model is defined by the attached claims and their equivalents.

Claims

1. A connection structure between a pump shaft and an impeller, characterized in that: One end of the hub (11) of the impeller (1) located inside the inlet flow channel (13) is configured to be closed at the end that matches the inlet flow channel (13) of the impeller (1), and the other end forms an axis groove (12), and the transverse axis direction of the axis groove (12) is consistent with the axis direction of the pump shaft (2) so as to match with the connection end (21) of the pump shaft (2) and be fixedly connected through the fixing connection member (3). The shaft walls on both sides of the connection end (21) are connected to the shaft groove (12) via fixing screws (31), one side of the shaft wall is provided with a key (32), and the key (32) and the fixing screw (31) are arranged in a staggered manner. The closed end (111) of the hub (11) extends along the inlet flow channel (13) of the impeller (1), and is connected and matched with the rear cover plate (15) of the impeller (1) to form a flow channel partition plate (4).

2. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: The fixing screw (31) is flush with the outer edge of the wheel hub (11).

3. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: The rear cover plate (15) and the wheel hub (11) are an integrated structure.

4. The connection structure between the pump shaft and the impeller according to claim 1, characterized in that: The rear cover plate (15) and the wheel hub (11) are split structures that cooperate with each other.

5. A centrifugal pump, comprising a pump body and a pump body assembly arranged in the pump body, characterized in that: The pump body assembly comprises a coupling structure between a pump shaft and an impeller according to any one of claims 1 to 4.

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