JPH0510799U - Bush for impeller - Google Patents

Abstract

(57) [Summary] [Purpose] To improve strength and durability. A bush for an impeller, which is provided with a shaft insertion hole 2 and is fixed to an impeller 3 and transmits the rotation of the shaft 5 to the impeller 3, wherein the shaft 5 has a polygonal cross section and the shaft insertion The shape of the hole 2 is made to match the shaft 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This invention relates to a bush for an impeller, which has improved strength and durability. The present invention relates to an impeller bush.

[0002]

[Prior Art and Problems to be Solved]

  Conventionally, as an impeller bush used for a cooling water circulation pump or the like, as shown in FIG. An impeller bush as shown in FIG. 5 is known.

[0003]   The impeller bush 51 is made of a resin material or the like, and at six locations. A circle fixed to the inner peripheral side of the impeller 53 having the blade portion 54 and formed in the central portion A key groove 59 is formed in the shaft-shaped insertion hole 52.

[0004]   Then, the shaft 55 having the key 60 is inserted into the shaft insertion hole 52. -The key 60 is inserted into the groove 59, and the shaft 55 rotates It is adapted to be transmitted to the impeller 53 through the propeller bush 51.   Further, as shown in FIG. 5, the impeller 53 fixed to the shaft 55 flows in. It is rotatably supported in a housing 56 provided with a mouth 57 and an outlet 58.

[0005]   In the impeller bush 51 configured as described above, the shaft 5 When 5 rotates, the impeller bush 51 and the impeller 53 rotate together. And then sucked into the housing 56 from the inflow port 57 according to the rotation of the shaft 55. The fluid such as water to be discharged passes through the inside of the housing 56 and flows out from the outflow port 58. Growling.

[0006]   However, the rotational force of the shaft 55 is transmitted through the impeller bush 51. Is transmitted to the impeller 53, the key 60 provided on the shaft 55 and the key Stress is concentrated between the key groove 59 provided in the impeller bush 51, and Since the part where the key groove 59 is provided is structurally weak, the key groove 59 part may crack or be polished. There is a problem that the shaft 55 is worn and the shaft 55 runs idle.

[0007]   This invention solves the problems of the conventional ones as described above, and The purpose is to provide a bush for impeller with improved durability and durability. Of.

[0008]

[Means for Solving the Problems]

  In order to achieve the above object, the present invention is provided with a shaft insertion hole. Is fixed to the impeller and transmits the rotation of the shaft to the impeller. And a shaft for making the cross section into a polygonal shape, The shape of the shaft insertion hole should match the shape of the shaft, and   It adopts a means that the shape of the surface and the shaft insertion hole is hexagonal. It

[0009]

[Action]

  This device is installed in the impeller bush by adopting the above means. The shaft insertion hole is formed in a polygonal shape. It is polygonal to match the shape, so it occurs as the shaft rotates. Since stress is evenly applied to the shaft insertion hole, stress is collected in one place as in the past. If the impeller bush is damaged or worn out, the shaft will spin. Is eliminated and durability is improved.

[0010]

【Example】

  An embodiment of the present invention shown in the drawings will be described below.   1 and 2 show an embodiment of an impeller bush according to the present invention. 3, a schematic diagram of a pump using the impeller bushing is shown.   The impeller bush 1 is made of a resin material or the like, and It is fixed to the inner peripheral side of 3, and the shaft insertion hole 2 is provided in the central portion, and The shaft insertion hole 2 has a hexagonal shape.   Further, the impeller 3 has six blade portions 4 at predetermined intervals in the circumferential direction. The shaft insertion hole 2 is provided with six sides facing the blade portion 4, respectively. .

[0011]   Then, as shown in FIG. 3, the shaft insertion hole 2 is provided with the shaft insertion hole. The shaft 5 with a hexagonal cross section that matches 2 is inserted, and the shaft Housing 6 having an inlet 7 and an outlet 8 It is rotatably supported within.

[0012]   In the impeller bush 1 configured as described above, the shaft 5 is When rotated, the rotational force of the shaft 5 is transmitted through the impeller bush 1 to the impeller. 3, the impeller 3 rotates according to the rotation of the shaft 5.

[0013]   Then, when the impeller 3 rotates in the housing 6, the housing 7 comes out from the inlet 7. The fluid such as water sucked into the casing 6 is rotated by the impeller 3 and the fluid It passes through the inside of the ging 6 and flows out from the outlet 8.   Further, the shaft insertion hole 2 provided in the impeller bush 1 has a hexagonal shape. The shaft 5 has a hexagonal cross section according to the shape of the shaft insertion hole 2. Since it has a shape, the stress generated by the rotation of the shaft 5 is Bushing for impeller is applied evenly to the holes 2 and stress is concentrated in one place as in the past. It will not be damaged or worn and will not spin idle.

[0014]   In the embodiment, the shape of the shaft insertion hole of the impeller bush is 6 Although the shape is square, the cross-sectional shape of the shaft is not limited to this and is polygonal. At the same time, the shape of the shaft insertion hole is also polygonal so as to match the shape of this shaft. And it is sufficient.   Also, match the number of impeller blades with the number of polygonal sides of the shaft insertion hole. It is preferable that the impeller blades and the sides of the shaft insertion hole face each other. Good

[0015]

[Effect of device]

  The present invention is configured as described above, so that it is provided in the impeller bush. The shaft insertion hole is formed in a polygonal shape. It is polygonal to match the shape, so it occurs as the shaft rotates. Since stress is evenly applied to the shaft insertion hole, stress is collected in one place as in the past. If the impeller bush is damaged or worn out, the shaft will spin. And has an excellent effect that durability is improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing an embodiment of an impeller bush according to the present invention.

FIG. 2 is a schematic sectional view taken along line AA of FIG.

FIG. 3 is a schematic cross-sectional view of a pump using an impeller bush in an embodiment of the impeller bush according to the present invention.

FIG. 4 is a schematic plan view showing a conventional impeller bush.

FIG. 5 is a schematic cross-sectional view of a pump using a conventional impeller bush.

[Explanation of symbols]

1,51 ... Bush for impeller 2, 52 ... Shaft insertion hole 3, 53 ... Impeller 4, 54 ... feather part 5,55 …… Shaft 6,56 ... Housing 7, 57 ... Inlet 8, 58 ... Outlet 59 ... Key groove 60 ... key

Claims (2)

[Scope of utility model registration request] 1. A bush for an impeller, which is provided with a shaft insertion hole (2), is fixed to an impeller (3), and transmits the rotation of the shaft (5) to the impeller (3), the shaft (5). The impeller bush having a polygonal cross section and a shaft insertion hole (2) conforming to the shaft (5). 2. A bush for an impeller according to claim 1, wherein the cross section of the shaft (5) and the shape of the shaft insertion hole (2) are hexagonal.