Abstract To a housing with an inlet and an outlet and one or two end walls there is detachably attached a support for a bearing box to mount a shaft in bearings outside the housing. A bushing is projecting through one end wall of the housing and supporting an impeller at the end inside the housing. The other end is in endwise friction contact with the shaft which has a threaded hole coaxially in this end and a bore communicating with a circumferential groove in the bushing which groove is limited by the shaft end and the bushing. The bushing is mounted in bearings attached to the housing end wall and the shaft, bushing an impeller are connected to a rigid coaxial unit with a screw running through the bushing, the head of the screw being pressed against the impeller and the opposite end being threaded to provide a thread joint the shaft having a correspondingly threaded hole. The pitch of the thread is so great that the joint is not self-locking, but is easily opened by pressing a lubricant between the shaft and the bushing through the bore and the recess.
A centrifugal pump comprising in combination: a housing having an inlet and an outlet for the media to be pumped and at least one end wall; a rotatable shaft having in one end thereof a bore and a coaxial threaded hole; a support detachably attached to the housing; a bearing box attached to the support for mounting the shaft in bearings; a shaft bushing in endwise friction contact with the shaft end having the threaded hole and the boring, the end of the bushing facing the shaft having a circumferential groove limited by the shaft end and the bushing and communicating with the boring, the other end of the bushing projecting through the housing end wall; bearings attached to the housing end wall for supporting the bushing; an impeller fixed to the other end of the bushing; and a screw running through the bushing for connecting the impeller, bushing and shaft to a coaxial unit, the screw being provided at one end thereof with a thread the pitch of which is from 5*-12* and corresponding to the thread in the shaft end to provide a thread joint the pitch of which is not self-locking.
Claim 4
Dependent Claim
194 words
A centrifugal pump comprising in combination: a housing having an inlet and an outlet for the media to be pumped and at least one end wall; a rotatable shaft having in one end thereof a bore and a coaxial threaded hole; a support detachably attached to the housing; a bearing box attached to the support for mounting the shaft in bearings; a shaft bushing in endwise friction contact with the shaft end having the threaded hole and the boring, the end of the bushing facing the shaft having a circumferential groove limited by the shaft end and the bushing and communicating with the boring, the other end of the bushing projecting through the housing end wall; bearings attached to the housing end wall for supporting the bushing; an impeller fixed to the other end of the bushing; and a screw running through the bushing for connecting the impeller, bushing and shaft to a coaxial unit, the screw being provided at one end thereof with a thread the pitch of which is from 5*-12* and corresponding to the thread in the shaft end to provide a thread joint the pitch of which is not self-locking.
Claim 5
Dependent Claim
49 words
The centrifugal pump as recited in claim 2 having two end walls opposite each other, wherein the end wall facing the impeller is detachable and the screw head, which is exposed when the detachable end wall is removed, is provided with recesses to enable the removing of the screw.