JPH0545833Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a shaft sealing device in a water pump for engine cooling.

[Conventional technology]

The water pump used for cooling the engine is a centrifugal impeller pump, which is small, lightweight, and suitable for high-speed rotation. As shown in FIG. 4, the shaft sealing device in this water pump includes a bearing chamber 8 of a casing 3 containing a ball bearing 2 that supports the drive shaft 1, and a bearing chamber 8 of a casing 3 that is connected to the casing 3 and is connected to one side of the drive shaft 1. In order to isolate the pump chamber 6 containing the emperor 5 fixed to the end edge 4, the outer circumferential surface of the drive shaft 1 contacts the inner circumferential surface of the seal chamber 7 of the casing 3 and the inner surface of the emperor 5, respectively. Shaft seal 11 consisting of a mechanical seal or seal ring that prevents leakage of water or steam at the contact surface
It is formed by providing Also, this shaft seal 11
An outlet hole 9 that opens from the vicinity of the seal chamber 7 to the lower outer surface of the casing 3 for discharging leaked water or steam from the bearing chamber 8 to the outside of the casing 3
and a steam hole 1 opening on the upper outer surface of the casing 3
0 is provided. For example, Utility Model Publication No. 63-32907 exists as such a technique.

[The problem that the idea aims to solve]

The outlet hole and steam hole in the conventional example are formed by opening directly on the outer surface of the casing, and at the same time communicate with the side edge of the shaft seal. There is a problem in that it also has the effect of drawing in muddy water or ducts from the outside.

[Means to solve the problem]

This idea was made to solve the problems of the conventional example, and a bottomed groove was formed from the vicinity of the seal chamber to the end surface of the bearing chamber, where the outlet hole and steam hole opened to the inner peripheral surface of the bearing chamber. It is formed by providing a lead-out groove and a steam groove. Further, the lead-out groove and the steam groove are formed in a straight line parallel to the drive shaft, and are formed to open at the end face of the bearing chamber. At the same time, the shaft end of the drive shaft is provided with a bottom part facing the end surface of the bearing chamber and a cylinder part parallel to the drive shaft, forming a bottomed cylinder, and a V-shaped pulley with a V-shaped groove in the opening edge. It was formed by providing

[Effect]

Since the lead-out groove and the steam groove open at the end face of the bearing chamber perpendicular to the drive shaft, the amount of muddy water and dust drawn in from the outlet of the lead-out groove and the steam groove outlet is extremely reduced. Further, since the outlet of the outlet groove and the outlet of the steam groove face the bottom of the bottomed cylindrical V-shaped pulley, the amount of muddy water or dust drawn in from these parts is extremely reduced. Although the outlet groove and the steam groove communicate with the bearing chamber, the amount of water or steam leaking through the seal is originally small, and the leaked water is vaporized and discharged from the steam groove together with the steam.

〔Example〕

Examples will be described with reference to the drawings.

In FIG. 1, the drive shaft 10 has one end 4
1, the emperor 50 is fixed and rotates integrally with the emperor 50, the other edge 42 is made to protrude outward from the casing 30, and a V-pulley 180 for driving is fixed to this part. .
The casing 30 includes a bearing chamber 80 and this bearing chamber 80.
A through hole portion 150 is connected to the through hole portion 150 in the axial direction, and a seal chamber 70 is formed by connecting to the through hole portion 150.
A pump chamber 60 is provided and formed in connection with the seal chamber 70. The pump chamber 60 is sealed with a lid 160. The bearing chamber 80 is formed long in the axial direction and has a smooth inner peripheral surface. Two ball bearings 20 are inserted and fixed into the bearing chamber 80 in a spaced-apart manner via a spacer ring 81, and are formed so as to support the drive shaft 10 in a cantilevered manner. Further, a narrow ring groove 82 having an inner diameter larger than the inner diameter of the bearing chamber 80 is provided near the opening of the bearing chamber 80, and an elastic ring 83 is inserted thereinto to prevent the ball bearing 20 from disengaging. do. The through hole portion 150 passes through the center of the bottom wall of the bearing chamber 80 and is connected to the seal chamber 70, and the drive shaft 10 passes through this portion in a loosely fitted manner. The through hole portion 150 is formed short in the axial direction, and is formed to be smaller than the inner circumferential diameter of the bearing chamber 80 and larger than the inner circumferential diameter of the seal chamber 70. In addition, as shown in FIG. 2, the through hole portion 150 and the bearing chamber 80 are located vertically, that is, when the Ooter pump is mounted and fixed, the plane passing through the lowest position and the highest position is taken vertically. 1
50 and the bearing chamber 80, a lead-out groove 120 and a steam groove 140 are formed as a cut-out circular groove or a bottomed open groove. Just as a slotter is inserted from the opening edge of the bearing chamber 80 and the wall portion is removed, the outlet groove 120 and the steam groove 140 are formed to face each other in pairs with the same spacing.

In other words, it is formed so as to communicate from the side edge of the seal chamber 70 to the inner circumferential surface of the bearing chamber 80. Seal chamber 70
are formed to have the same diameter, which is smaller than that of the through-hole portion 150, and are formed to penetrate into the pump chamber 60. A seal 11 formed by a seal ring or a mechanical seal is inserted into the seal chamber 70 to prevent water or steam from leaking from the pump chamber 60 to the bearing chamber 80. Further, a coupling 170 having a flange 171 is fixed to the other end edge 42 of the drive shaft 10 . The coupling ring 170 is formed so that the boss 172 is inserted into the drive shaft 10 and rotates together with the drive shaft 10 . Further, the flange portion 171 is integrally formed with a bottom portion 181 perpendicular to the drive shaft 10 and a cylindrical portion 182 parallel to the drive shaft 10, and a V-shaped groove 183 is formed in the opening edge of the cylindrical portion 182.
Fix the pulley 180. In other words, the flange surface of the flange part 171 and the bottom part 181 are removably screwed and fixed in a state where they are in contact with each other. Exactly the bottom 181 of the casing 30
The cylindrical body portion 183 is formed so as to face the opening surfaces of the lead-out groove 120 and the steam groove 140 and cover the outside of the bearing chamber 80 of the casing 30. V pulley 180
may be formed by bending two steel plates, as shown in FIG. 1, or may be formed by bending one steel plate, as shown in FIG.

〔effect〕

Since this invention is constructed as explained above, it produces the following effects.

Since the outlets of the lead-out groove and steam groove are located on the end face of the casing, there is less muddy water and dust entering from the outside.
At the same time, since the bottomed cylindrical V-pulley is located opposite the outlet of the groove, there is no risk of water leakage or dust intrusion.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a water pump according to this invention with a part removed, Fig. 2 is an explanatory diagram of a lead-out groove and a steam groove, and Fig. 3 is a partially removed water pump according to another embodiment. FIG. 4 is a partially cutaway sectional view of a conventional water pump. 10... Drive shaft, 30... Casing, 80...
...Bearing chamber, 120...Leading groove, 140...Steam groove, 180...V pulley.

Claims (1)

[Scope of utility model registration request] In the casing, a bearing chamber that opens at the end face of the casing, a through hole connected to the bearing chamber, a seal chamber connected to the through hole, a pump chamber connected to the seal chamber, and a cantilever shape are provided. In a centrifugal water pump with a drive shaft supported on the
50 and the bearing chamber 80, open to the opening surface of the bearing chamber 80 of the casing 30, and formed in the highest position of the bearing chamber 80, and a pair facing the steam groove 140. None, the casing 30 is provided with an open channel-like outlet groove 120 formed at the lowest position of the bearing chamber 80, and the bottom part 181 is fixed to the drive shaft 10 and faces the opening surfaces of the steam groove 140 and the outlet groove 120 of the casing 30. and bearing chamber 8 of casing 80
V pulley 180 with a cylindrical body part 182 covering the outside of 0 and a V groove part 183 formed on the opening edge of the cylindrical body part 182
A water pump characterized by being provided with.