CN215640602U

CN215640602U - Impeller air pressure testing device

Info

Publication number: CN215640602U
Application number: CN202121571959.2U
Authority: CN
Inventors: 刘龙; 冉仕兵; 吴俊力
Original assignee: Shanghai East Pump Group Co Ltd
Current assignee: Shanghai East Pump Group Co Ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-01-25
Anticipated expiration: 2031-07-12

Abstract

The utility model provides an impeller air test pressure device which comprises a press, a pressure rod, a pressure plate, an impeller, a supporting plate and a base which are coaxially arranged in sequence, wherein the pressure rod is telescopically arranged at the bottom of the press, the supporting plate is arranged on the top end face of the base, the impeller is placed between the pressure plate and the supporting plate, and the impeller comprises an axle hole and an impeller piece. By the aid of the centrifugal pump impeller pressure testing device, pressure testing can be carried out on the impeller independently before the impeller is installed in the centrifugal pump, so that whether a shaft hole has casting defects or not is rapidly detected, and workload of subsequent assembly, disassembly and assembly is reduced.

Description

Impeller air pressure testing device

Technical Field

The utility model relates to the field of casting, in particular to an impeller air pressure testing device.

Background

The impeller of the centrifugal pump is generally a casting, and casting defects such as shrinkage cavities, cracks and the like are easily generated inside the impeller. When the defect runs through the shaft hole and the outer surface of the impeller, liquid enters the shaft hole, corrodes the shaft and even leaks to the environment along the surface of the shaft, so that the pressure test of the impeller is needed.

The prior art is generally:

1. the impeller casting is directly processed, and the pump is assembled and then is subjected to pressure test by the whole machine. The disadvantages are that: when the whole machine is tested and leaks, the workload of disassembly and reassembly is large, and the impeller repair can also influence the assembly fit size precision.

2. Some manufacturers have a part pressure test procedure, that is, a hydrostatic pressure test of the impeller is performed before assembly. However, the hydrostatic test pressure of the impeller is higher and is generally 1.5 times of the maximum working pressure of the pump.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a pressure testing device which can be used for independently testing an impeller before the centrifugal pump is integrally assembled, so that subsequent work such as disassembly is reduced.

In order to achieve the purpose, the utility model provides an impeller air test pressure device which comprises a press, a pressure rod, a pressure plate, an impeller, a supporting plate and a base which are coaxially arranged in sequence, wherein the pressure rod is telescopically arranged at the bottom of the press, the supporting plate is arranged on the end surface of the top of the base, the impeller is placed between the pressure plate and the supporting plate, and the impeller comprises a shaft hole and a wheel piece.

Preferably, a first sealing gasket is arranged between the pressure plate and the impeller.

Preferably, a second sealing gasket is arranged between the impeller and the supporting plate.

Preferably, a conical head is arranged at the bottom of the pressure lever in a protruding mode.

Preferably, the top end surface of the pressure plate comprises a conical recess.

Preferably, the size of the conical groove on the top end surface of the pressure plate corresponds to the size of the conical head at the bottom of the pressure rod.

Preferably, the bottom of the pressure plate is provided with a first boss protruding downwards, and the bottom edge of the first boss shrinks inwards to form a first guide angle.

Preferably, the top of the supporting plate is provided with a second boss protruding upwards, the top edge of the second boss shrinks inwards to form a second guide angle, and the axial channel extends to the top end face of the second boss.

Preferably, the diameter of the upper edge of the first boss is equal to the inner diameter of the shaft hole, and the diameter of the lower edge of the second boss is equal to the inner diameter of the shaft hole.

Preferably, the first sealing gasket and the second sealing gasket have the same inner diameter as the inner diameter of the shaft hole, and the first sealing gasket and the second sealing gasket have the same outer diameter as the outer diameter of the shaft hole.

Compared with the prior art, the utility model has the advantages that: before the impeller is installed in the centrifugal pump, the impeller is subjected to pressure test detection independently, and the hydraulic test of the whole machine is not leaked after the impeller is subjected to rough machining and pressure test; once rough machining leaks, measures can be taken in time to save or scrap the leakage, the leakage is avoided when the whole machine is tested, the labor is wasted in assembling and disassembling, and the time is delayed, so that whether the shaft hole has casting defects or not is quickly detected, and the workload of subsequent assembling and disassembling is reduced.

Drawings

Fig. 1 is a schematic sectional view of the whole structure of an impeller test gas pressure device according to the present invention.

FIG. 2 is a schematic cross-sectional view of a platen according to the present invention.

FIG. 3 is a schematic cross-sectional view of a pallet of the present invention.

Fig. 4 is a schematic cross-sectional view of an impeller according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be further described below.

The utility model provides an impeller 4 air test pressure device, which comprises a press 1, a pressure lever 2, a pressure plate 3, an impeller 4, a supporting plate 5 and a base 6 which are coaxially arranged in sequence, wherein the pressure lever 2 is telescopically arranged at the bottom of the press 1, the supporting plate 5 is arranged on the top end surface of the base 6, the impeller 4 is arranged between the pressure plate 3 and the supporting plate 5, and the impeller 4 comprises a shaft hole 41 and a wheel piece 42. The specific operation mode is as follows: firstly, a pressing rod 2 is lifted through a press 1, then an operator places an impeller 4 on a supporting plate 5, the lower end of a shaft hole 41 of the impeller 4 is blocked by the supporting plate 5, then a pressing plate 3 is placed at the upper end of the shaft hole 41 of the impeller 4, so that the upper end of the shaft hole 41 is covered by the pressing plate 3, then the press 1 is started, the pressing rod 2 is pressed downwards, the pressing plate 3 is pressed through the pressure of the pressing rod 2, and the pressing plate 3 and the supporting force formed by the supporting plate 5 on a base 6 form bidirectional extrusion, so that the inside of the shaft hole 41 is ensured to form a closed state; the screw port 52 on the side surface of the supporting plate 5 is connected with an air source, and after the compression bar 2 is pressed in place, the air source is opened to check whether obvious leakage exists.

And then closing the air source, maintaining the pressure for a certain time, and if the pressure is not obviously reduced after the valve is closed, the fact that the shaft hole 41 of the impeller 4 has no leakage can be proved. By the mode, a lower air pressure test can be adopted, and the same effect of a hydrostatic pressure test with higher pressure can be achieved.

Placed first sealed pad 7 between clamp plate 3 and the impeller 4, placed second sealed pad 8 between impeller 4 and the layer board 5, first sealed pad 7 and second sealed pad 8 set up respectively in the upper end and the lower extreme of the shaft hole 41 of impeller 4, and the purpose of sealed pad is in order to form airtight environment in letting shaft hole 41 more easily, reduces the influence of gas leakage that the wearing and tearing of clamp plate 3 and layer board 5 lead to the pressure result of trying.

The bottom of the pressure lever 2 is provided with a conical head 21 in a protruding way, and the top end surface of the pressure plate 3 comprises a conical groove 31; the size of the conical recess 31 of 3 top end faces of clamp plate is corresponding with the conical head 21 of 2 bottoms of depression bar, the conical head 21 of the 2 bottoms of depression bar that corresponds the setting and the recess 31 of 3 top end faces of clamp plate, the purpose is in order to prevent that too big pressure from leading to depression bar 2 and clamp plate 3 to produce the displacement, thereby make depression bar 2 when pushing down, can be more stable, make clamp plate 3 can not produce the displacement, conical head 21 is the same with the size of recess 31 is in order to let do not have the space between the conical head 21 of depression bar 2 and the recess 31 of clamp plate 3, increase area of contact, thereby guarantee that clamp plate 3 atress is even, be difficult to produce the condition such as warp.

The bottom of the pressure plate 3 is provided with a first boss 33 protruding downwards, and the bottom edge of the first boss 33 shrinks inwards to form a first guide angle 34; the top of the supporting plate 5 is provided with a second boss 53 protruding upwards, the top edge of the second boss 53 shrinks inwards to form a second guide angle 54, the axial channel 51 extends to the top end face of the second boss 53, the first boss 33 and the second boss 53 are clamped in the hole cavity of the shaft hole 41 in the use process, the purpose is to prevent the pressing plate 3 and the supporting plate 5 from deviating from the impeller 4 and even separating from the shaft hole 41 in the extrusion process, and the first guide angle 34 and the second guide angle 54 are arranged to enable the pressing plate 3 and the first boss 33 and the second boss 53 of the supporting plate 5 to be clamped in the hole cavity of the shaft hole 41 of the impeller 4 more easily.

The upper edge diameter of the first boss 33 is equal to the inner diameter 411 of the shaft hole, and the lower edge diameter of the second boss 53 is equal to the inner diameter 411 of the shaft hole, so that the first boss 33 and the second boss 53 of the pressure plate 3 and the supporting plate 5 cannot generate any relative displacement after being clamped into the hole cavity of the shaft hole 41, thereby ensuring that the pressure plate 3, the supporting plate 5 and the impeller 4 are accurately coaxial, and ensuring that the air tightness of the shaft hole 41 is kept good in the whole test air pressure process.

The inner diameters of the first sealing gasket 7 and the second sealing gasket 8 are equal to the inner diameter 411 of the shaft hole, the outer diameters of the first sealing gasket 7 and the second sealing gasket 8 are equal to the outer diameter 412 of the shaft hole, the inner diameter and the outer diameter of the sealing gaskets correspond to the inner diameter and the outer diameter of the shaft hole 41, the purpose is to completely cover two ends of the shaft hole 41, namely, the air tightness of the shaft hole 41 in the process of testing air pressure is guaranteed, and the conditions that two ends of the shaft hole 41 of the impeller 4 cannot be abraded in the extrusion process are also guaranteed.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any way. It will be understood by those skilled in the art that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The impeller air test pressure device is characterized in that the diameter of the pressing plate and the diameter of the supporting plate are the same as the outer diameter of the shaft hole, an axial channel is arranged in the center of the end face of the top of the supporting plate, a screw is arranged on the side face of the supporting plate, and the screw is communicated with the channel.

2. The impeller air pressure testing device according to claim 1, wherein a first sealing gasket is placed between the pressure plate and the impeller.

3. The impeller gas testing pressure device according to claim 2, wherein a second gasket is placed between the impeller and the supporting plate.

4. The impeller air pressure testing device according to claim 1, wherein a conical head is protrusively provided at the bottom of the compression bar.

5. The impeller test plenum of claim 4, wherein the top end surface of the pressure plate includes a conical recess.

6. The impeller air pressure testing device according to claim 5, wherein the conical groove on the top end surface of the pressure plate corresponds in size to the conical head on the bottom of the pressure rod.

7. The impeller air pressure testing device according to claim 1, wherein the bottom of the pressure plate has a first boss protruding downward, and the bottom edge of the first boss is shrunk inward to form a first lead angle.

8. The impeller air pressure testing device according to claim 7, wherein the top of the supporting plate has a second boss protruding upward, the top edge of the second boss is shrunk inward to form a second lead angle, and the axial channel extends to the top end face of the second boss.

9. The impeller test air pressure device according to claim 8, wherein the upper edge diameter of the first boss is equal to the inner diameter of the shaft hole, and the lower edge diameter of the second boss is equal to the inner diameter of the shaft hole.

10. The impeller air pressure testing device according to claim 3, wherein the inner diameters of the first sealing gasket and the second sealing gasket are equal to the inner diameter of the shaft hole, and the outer diameters of the first sealing gasket and the second sealing gasket are equal to the outer diameter of the shaft hole.