Self-priming starting device for centrifugal pump

Patent metadata

Field	Value
Publication number	US-11480180-B2
Application number	US-201917598287-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Jul 19, 2019
Publication date	Oct 25, 2022
Grant date	Oct 25, 2022

Abstract

A self-priming starting device for a centrifugal pump is mounted on a water inlet pipe of the centrifugal pump and includes an outer housing, an inner housing, a primary spacer, a secondary spacer, an opening and closing disc and a tertiary spacer which are sequentially provided in the outer housing from top to bottom, and an elastic steel plate provided in the water inlet pipe. A drum is provided in the inner housing, and air inlet pipes and air discharging pipes are provided on the inner housing. The drum is provided with drum chambers and a three-blade support is provided in the drum. The opening and closing disc is provided with a vertical rod. A gas-liquid cutter is provided between the primary spacer and the secondary spacer. The primary spacer, the secondary spacer, the opening and closing disc and the tertiary spacer are provided with through-holes.

First claim

What is claimed is:

1. A self-priming starting device for a centrifugal pump, wherein the self-priming starting device is mounted on a water inlet pipe of the centrifugal pump and comprises an outer housing, an inner housing, a drum, a three-blade support, a primary spacer, a secondary spacer, a tertiary spacer, an opening and closing disc, and an elastic steel plate;
the outer housing has a bottom being in communication with the water inlet pipe, and the primary spacer, the secondary spacer and the tertiary spacer are provided sequentially in the outer housing—from top to bottom;
the primary spacer is provided with a primary spacer through-hole, the inner housing is provided above the primary spacer through a support, an outer wall of the inner housing forms an outer self-priming chamber with an inner wall of the outer housing and a top wall of the primary spacer, the inner housing is provided with a plurality of air inlet pipes and a plurality of air discharging pipes, the air inlet pipes are in communication with the outer self-priming chamber, and the air discharging pipes are in communication with an atmosphere;
the drum is provided in the inner housing and fits within an inner wall of the inner housing, the drum is provided with a. plurality of drum chambers, and the air inlet pipes, the air discharging pipes and the drum chambers have an equal number and are evenly distributed in a circumferential direction, the drum forms an inner self-priming chamber inside, the three-blade support has a rotating body and three support rods evenly distributed on the rotating body in a circumferential direction, the three-blade support is rotatably arranged in the inner self-priming chamber, the drum is provided with two limit blocks on an inner wall of the drum, a. top of a support rod of the three support rods is located between the two limit blocks, each of the drum chambers is provided with a piston, and the piston is connected to the rotating body via a connecting rod;
the secondary spacer and the primary spacer form a gas-liquid separation chamber-therebetween, and a gas-liquid cutter is provided in the gas-liquid separation chamber, the gas-liquid cutter has spiral blades attached to a surface of the gas-liquid cutter, the secondary spacer is provided with a secondary spacer through-hole, the secondary spacer has a plurality of gas-liquid inlets near the inner wall of the outer housing, and a gas-liquid separation plate is provided beside the gas-liquid inlets;
the secondary spacer, the tertiary spacer and the outer housing form a gas-liquid chamber therebetween, the opening and closing disc is installed in the gas-liquid chamber and is configured to slide up and down along a wall surface of the outer housing and divide the gas-liquid chamber into an upper gas-liquid chamber and a lower gas-liquid chamber, the opening and closing disc is provided with a plurality of secondary drainage holes, the opening and closing disc is provided with a vertical rod in a middle, and the vertical rod is provided with a transverse through-hole and a longitudinal through-hole, a first end of the longitudinal through-hole is in communication with the transverse through-hole, and a second end of the longitudinal through-hole is in communication with the water inlet pipe, and the opening and closing disc has a bottom wall being configured to fit completely against an upper wall of the tertiary spacer; and
the tertiary spacer is provided with a plurality of tertiary spacer through-holes, the tertiary spacer through-holes communicate the lower gas-liquid chamber with the water inlet pipe, the elastic steel plate in a curved shape is fixed on an inner wall surface of the water inlet pipe, the elastic steel plate is provided with a plurality of elastic steel plate through-holes, a bottom end of the vertical rod extends through the tertiary spacer and the elastic steel plate, and the bottom end of the vertical rod is provided with a limit boss.

2. The self-priming starting device for the centrifugal pump according to claim 1 , wherein the opening and closing disc has a concave cross-section, the opening and closing disc has a stepped bottom, and a top of the tertiary spacer is provided with a groove being configured to engage with the stepped bottom of the opening and closing disc, so that the bottom wall of the opening and closing disc is configured to fit closely to the upper wall of the tertiary spacer.

3. The self-priming starting device for the centrifugal pump according to claim 1 , wherein a number of the air inlet pipes, a number of the air discharging pipes and a number of the drum chambers are all three.

4. The self-priming starting device for the centrifugal pump according to claim 1 , wherein in a direction from the outer self-priming chamber to the drum, the air inlet pipes each have a tapering inner diameter with a tapering angle of 20°, and in a direction from the inner housing to the outer housing, the air discharging pipes each comprise a constricted section and a cylindrical section, and the constricted section has a constriction angle of 40°.

5. The self-priming starting device for the centrifugal pump according to claim 1 , wherein a resilient deformation valve is provided on a top of the vertical rod, the resilient deformation valve has a trapezoidal cross-section, the resilient deformation valve is provided with a resilient deformation valve through-hole at a top, the resilient deformation valve has a primary drainage hole at a bottom of a side wall, and a ratio of a diameter of the resilient deformation valve through-hole to a diameter of the primary drainage hole is 4:1.

6. The self-priming starting device for the centrifugal pump according to claim 1 , wherein the gas-liquid cutter has a circular cross-section, and a diameter of the gas-liquid cutter gradually decreases from a middle to two ends, the spiral blades on the two ends of the gas-liquid cutter are spiraled in opposite directions, and a distance between adjacent two of the spiral blades gradually increases in a direction from the two ends to the middle of the gas-liquid cutter.

7. The self-priming starting device for the centrifugal pump according to claim 5 , wherein a ratio of a diameter of the primary spacer through-hole, a diameter of the secondary spacer through-hole and the diameter of the resilient deformation valve through-hole is 1:1:1.

8. The self-priming starting device for the centrifugal pump according to claim 5 , wherein a plurality of impact curved holes are provided on the opening and closing disc near the inner wall of the outer housing, and the impact curved holes are symmetrical two by two with respect to the vertical rod, and the secondary drainage holes are symmetrical two by, two with respect to the vertical rod, the impact curved holes, the secondary drainage holes and the primary drainage hole have an equal number, the impact curved holes each are an equidiameter curved hole, the impact curved holes each have an arc of 25°, the impact curved holes each have a diameter that is twice a diameter of each of the secondary drainage holes, and an angle between an axis of a top outlet of each of the impact curved holes and a wall surface of the gas-liquid chamber is 15°.

9. The self-priming starting device for the centrifugal pump according to claim 5 , wherein the piston, the gas-liquid cutter, and the resilient deformation valve are made of a rubber material, and the elastic steel plate is made of 45# steel, and the remaining components are formed by processing a graphene material.

Assignees

• Univ Jiangsu

Inventors

• Li Wei
• Chang Hao
• Shi Weidong
• Zhou Ling
• Cao Weidong
• Zhu Yong
• Lang Tao
• Wei Yangyang

Classifications

• F04D9/02 Primary

  Self-priming pumps · CPC title

• F04B27/065

  having cylinders in star- or fan-arrangement, the connection of the pistons with an actuating element being at the inner ends of the cylinders · CPC title

• F04D1/00

  Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps (adapted for pumping specific fluids F04D7/00; priming or boosting F04D9/00) · CPC title

• F04D29/007

  especially adapted for liquid pumps · CPC title

• F04D9/04 Primary

  using priming pumps; using booster pumps to prevent vapour-lock · CPC title