Novel sleeve coupler

The utility model provides a novel sleeve coupler. The novel sleeve coupler comprises an upper sleeve and a lower sleeve. The novel sleeve coupler is characterized in that the external diameter of the tail segment of the upper sleeve is equal to the internal diameter of the front segment of the lower sleeve, the outer side of the tail segment of the upper sleeve is provided with outer threads, the inner wall of the front segment of the lower sleeve is provided with inner threads, and the tail segment of the upper sleeve is located in the front segment of the lower sleeve and connected with the front segment of the lower sleeve in a threaded mode. The tail segment of the upper sleeve is sleeved with a nut and a gasket. The front segment of the lower sleeve is connected with a set screw in a penetrating mode, and the set screw is fixedly located in the upper sleeve which is arranged in the front segment of the lower sleeve. The novel sleeve coupler has the advantages that under the circumstance that water pumps with the same series and different types are tested, the length of the sleeve coupler can be changed, pump shafts are not needed to be produced anew, and the cost is saved.