Centrifugal sewage high-pressure pump

Abstract

A centrifugal high-pressure liquid pump for sewage discharge includes a fixed plate with high and low pressure outlets and a swashplate axial piston pump connected to its lower side. The pump pressurizes the drawn liquid and outputs it through the high-pressure outlet. A filter assembly is connected to the lower side of the swashplate axial piston pump to filter impurities entering it. A casing assembly with an inlet and a flow chamber is disposed outside the filter assembly. A motor is connected to the fixed plate to drive a transmission shaft connecting the swashplate axial piston pump and a centrifugal impeller. The centrifugal impeller is located inside the inlet to generate negative pressure, drawing external liquid into the inlet and discharging the liquid containing impurities from the flow chamber through the low-pressure outlet. This invention allows for the filtration of impurities in the liquid before pressurization and output at high pressure, and the structure is not easily damaged and is easy to maintain.

Claims

1. A centrifugal high-pressure sewage pump, comprising: A fixed plate has an upper shaft hole and a high-pressure outlet and a low-pressure outlet around its perimeter. The lower side of the fixed plate has a high-pressure inlet and a low-pressure inlet, the high-pressure inlet leading to the high-pressure outlet and the low-pressure inlet leading to the low-pressure outlet. A swashplate axial piston pump is attached to the fixed plate at its upper side and has at least one pressure port and at least one suction port, the at least one pressure port leading to the high-pressure inlet. The lower side of the swashplate axial piston pump has a pump cover with a central shaft hole and at least one inlet hole, the at least one inlet hole leading to the at least one suction port. A filter assembly includes an inner filter screen and a sealing cap. The inner filter screen is a tubular mesh body with its upper end attached to the pump cover. The sealing cap is attached to the lower end of the inner filter screen and has a lower shaft hole. A filter chamber is formed between the pump cover, the sealing cap, and the inner filter screen, the filter chamber communicating with the at least one inlet hole. A housing assembly includes a lower housing and a chassis; the lower housing is fitted around the inner filter and its upper end is connected to the pump cover; the chassis is located directly below the cover and connected to the lower end of the lower housing, and the chassis has a liquid inlet; a flow cavity is formed between the pump cover, the chassis, the lower housing and the inner filter, and the flow cavity leads to the low-pressure inlet; a motor is connected to the fixed plate and has a drive shaft, which pivots sequentially through the upper shaft hole, the middle shaft hole and the lower shaft hole and is connected to the swashplate axial piston pump; a turbine impeller is connected to the lower end of the drive shaft, the turbine impeller is located in the flow cavity and surrounds the inner filter; and a centrifugal impeller is centrally connected to the lower end of the drive shaft, the centrifugal impeller is located between the cover and the chassis.

2. The centrifugal high-pressure hydraulic pump for sewage discharge as described in claim 1, wherein the swashplate axial piston pump has a pump housing, the upper end of which is connected to the fixed plate, and the lower end of which is connected to the pump cover. The pump cover has a lower annular portion around its periphery, the lower annular portion protruding radially from the pump housing and having a connecting hole. The at least one inlet hole communicates with the interior of the pump housing. A groove is formed on the bottom surface of the fixed plate, the inner side of which communicates with the at least one suction port, and the outer side of which communicates with the interior of the pump housing. The tubular assembly further includes an upper tubular shell, which is looped around the pump housing and its upper end is connected to the fixed plate. The lower end of the upper tubular shell is connected to the periphery of the lower annular portion. A connecting cavity is formed between the pump housing and the upper tubular shell, the connecting cavity communicating with the low-pressure inlet. The two ends of the connecting hole are respectively connected to the connecting cavity and the flow cavity.

3. The centrifugal high-pressure pump for sewage discharge as described in claim 2, wherein a motor seat and a plunger pump seat are formed on the upper and lower sides of the fixed plate, an upper annular portion is connected to the outer periphery of the plunger pump seat, a high-pressure inlet is formed on one side of the plunger pump seat, and a groove is formed on the other side of the plunger pump seat; a low-pressure inlet is formed on the upper annular portion; a swashplate seat is formed on the upper side of the middle portion of the pump cover; the motor is coupled to the motor seat, the upper side of the swashplate axial plunger pump is coupled to the lower side of the plunger pump seat, the upper end of the pump housing is coupled to the periphery of the plunger pump seat, and the lower end of the pump housing is coupled to the periphery of the swashplate seat; the upper end of the upper casing is coupled to the periphery of the upper annular portion.

4. The centrifugal high-pressure pump for sewage discharge as described in claim 3, wherein an inner filter screen seat is formed on the lower side of the middle portion of the pump cover; the connecting hole is formed between the upper surface of the lower annular portion and the lower surface of the peripheral portion of the inner filter screen seat; a slot ring is attached to the peripheral portion of the inner filter screen seat, the slot ring is surrounding the lower end of the at least one liquid inlet hole, and the lower end of the connecting hole is recessed inward at the periphery of the slot ring to form a recess, the space in the recess leading to the connecting hole; the slot ring has a slot; the upper end of the inner filter screen is inserted into the slot for fixation; the upper end of the lower tube shell is attached to the peripheral portion of the inner filter screen seat.

5. The centrifugal high-pressure sewage pump as claimed in claim 1, wherein the turbine impeller includes a blade support disk and a blade support, the blade support disk being sleeved around the lower end of the drive shaft, the lower part of the blade support disk contacting the upper part of the centrifugal impeller, and the centrifugal impeller being coupled to the blade support disk; the blade support is tubular and has multiple perforations, the lower end of the blade support being coupled to the periphery of the blade support disk, such that the blade support is located within the flow cavity and surrounds the inner filter screen, and multiple inclined blades are coupled to the blade support, the extension direction of the inclined blades being inclined relative to the axial direction of the drive shaft.

6. The centrifugal high-pressure pump for sewage discharge as claimed in claim 5, wherein a plurality of helical blades are incorporated into the blade support, the extension direction of which is a helical segment with the axial direction of the drive shaft as the center of rotation; the blade support includes a plurality of rings spaced apart along the axial direction of the drive shaft, wherein the lowermost ring is incorporated into the periphery of the blade support disc, and a plurality of inclined ribs are connected between the rings, the inclined ribs being arranged in a manner surrounding the drive shaft, and the extension direction of each inclined rib being inclined relative to the axial direction of the drive shaft; each of the openings is formed between two adjacent rings and two adjacent inclined ribs; each ring except the lowermost ring is connected to a plurality of the helical blades in a circumferential arrangement; and each of the inclined ribs is connected to one of the inclined blades at the portion located between two adjacent rings.

7. The centrifugal high-pressure pump for sewage discharge as claimed in claim 1, wherein an annular conical surface is formed on the upper surface of the chassis, and the inlet penetrates the middle of the annular conical surface; the centrifugal impeller has a blade disk, the center of which is connected to the lower end of the drive shaft, the inlet is located directly below the middle portion of the blade disk, and a plurality of blades are connected in a circumferential arrangement around the blade disk, the lower edge of each blade being inclined adjacent to the annular conical surface.

8. The centrifugal high-pressure pump for sewage discharge as described in claim 1, wherein a base plate is provided directly below the chassis, and a primary filter screen is connected between the periphery of the chassis and the periphery of the base plate.

9. The centrifugal high-pressure pump for sewage discharge as described in claim 8, wherein the motor is a DC motor, a frequency converter motor, a stepper motor or a servo motor; and the filtration accuracy of the inner filter is higher than that of the primary filter.

Images