CN105952661A - Visual experiment device for centrifugal pump impeller - Google Patents

Abstract

The invention discloses a visual experiment device for a centrifugal pump impeller. The visual experiment device comprises a support and an impeller chamber installed on the support, wherein the impeller chamber is provided with a hollow water diversion chamber and prepared from a transparent organic glass material. The visual experiment device further comprises a servo motor, a water storage groove and a transmission shaft, wherein the servo motor is connected with the transmission shaft through a coupling, and the transmission shaft sequentially penetrates through the water storage groove and the impeller chamber and then is in transmission connection with the impeller; a plurality of outlet runners are formed in the circumferential sidewall of the impeller chamber and connected with water delivery tubes respectively, a plurality of water inlet ports are correspondingly formed in the water storage groove, and the water delivery tubes are connected with the corresponding water inlet ports; a water outlet port is formed in the sidewall of the water storage groove opposite to an inlet runner of the impeller chamber, an upper pore plate and a lower pore plate are installed at the water outlet port, and the upper pore plate is capable of rotating relative to the lower pore plate; and the impeller is arranged at the centre of the tail end of the inlet runner. According to the visual experiment device disclosed by the invention, the internal flowing of the impeller is conveniently and intuitively observed through a particle image velocimetry technology.

Description

Centrifugal pump impeller visualization test device

technical field

The invention relates to a visual test device for a centrifugal pump impeller, which belongs to the technical field of internal flow of a centrifugal pump.

Background technique

The centrifugal pump impeller is a hydraulic element that transfers the energy from the prime mover to the conveying medium liquid, and the energy increases after the liquid flows through the impeller. As the core component of the centrifugal pump, its design directly determines the performance of the entire centrifugal pump unit. The impeller designed with theoretical knowledge needs to be tested to verify its performance. However, with the development of modern optics, computer technology, CCD camera and other technologies, people are no longer satisfied with just obtaining performance parameters such as head and efficiency. To know the root cause of these performance parameters changes, it is necessary to test the internal flow of the impeller. . Particle image velocimetry technology is a flow measurement technology developed gradually from qualitative to quantitative by using image processing technology and particle tracer flow display method. It has been widely used in the internal flow test research of pump impeller.

Internal flow testing of centrifugal pump impellers begins with consideration of the centrifugal pump test setup. At present, the centrifugal pump test device mainly includes two types: open type and closed type. Closed test devices usually include complex circulation pipelines, water collection tanks, cavitation tanks and vacuum pumps. The open test device is slightly simpler, but in order to stabilize the liquid flow, the open test device generally uses a longer pipeline and a larger open sump. It can be seen that the traditional centrifugal pump test device has complex structure, large volume and high cost.

Secondly, most of the current centrifugal pumps use the main shaft to directly protrude from the pump body, and then the camera directly takes pictures of the flow field inside the impeller from the front of the water absorption chamber. The shooting area will be blocked by the drive shaft or motor of the pump unit, and the entire impeller area cannot be photographed. , cannot guarantee the shooting effect.

In addition, when adjusting the inlet valve of the impeller, the water flow will generate a vortex after passing through the valve, which will cause the flow at the inlet of the impeller to be unstable, and a long pipeline is usually required to stabilize the water flow.

Based on the above problems, the present invention provides a centrifugal pump impeller visualization test device, which can directly capture the flow field in the entire impeller channel through the particle image velocity measurement technology, and can observe the internal flow of the impeller more conveniently and intuitively.

Contents of the invention

In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a centrifugal pump impeller visual test device with simple structure, compact structure, reliable performance, convenient use and low cost.

The technical scheme adopted in the present invention is:

Centrifugal pump impeller visual test device, including a bracket and an impeller chamber installed on the bracket. The impeller chamber has a hollow water diversion chamber and is made of transparent organic glass material. The center of the water diversion chamber is equipped with an impeller. It is characterized in that : also includes servo motor, water storage tank and transmission shaft, described servo motor is connected with described transmission shaft through shaft coupling, and described transmission shaft passes through described water storage tank, impeller chamber and then is connected with impeller transmission ;

The circumferential side wall of the impeller chamber is provided with a number of outlet flow channels, which are respectively connected to the water delivery pipes, and the water storage tank is correspondingly provided with a number of water inlets, and the water delivery pipes are connected to the corresponding connected to the water inlet;

A water outlet is provided on the side wall of the water storage tank opposite to the inlet channel of the impeller chamber, and an upper orifice plate and a lower orifice plate are installed at the water outlet, and the upper orifice plate can be opposite to the lower hole. The plate rotates; the center of the end of the inlet channel is provided with the impeller.

Further, a flow stabilizer is provided at the front end of the inlet channel of the impeller chamber.

Further, the upper orifice plate and the lower orifice plate have the same structure, and both the upper orifice plate and the lower orifice plate are provided with a plurality of circles of water passing holes arranged in a ring shape. By rotating the upper and lower orifice plates, the size of the water hole is changed to control the flow.

Further, the upper orifice plate is fixed on the water storage tank by screws, and a threaded through hole is provided on the lower orifice plate, and a threaded rotating head is arranged in the threaded through hole, and the rotating head can be Screw in or out of the threaded through hole, and the distance between the upper orifice plate and the lower orifice plate is adjusted by the rotating head.

Further, a buckle is provided between the water storage tank and the upper orifice plate, the buckle is an L-shaped structure, one end of the L-shaped knot is fixedly connected to the water storage tank, and the other end leans against the upper surface of the orifice plate.

Further, diversion plates for increasing fluid flow are arranged in a staggered manner in several outlet channels, and the outlet channels are divided into S-shaped channels by the diversion plates.

Further, the transmission shaft and the water storage tank are connected by bearings, and a bearing installation hole is opened on the water storage tank, one end of the bearing is abutted against the bearing installation hole, and the other end is abutted against the bearing cover plate, and the The above-mentioned bearing cover plate is fixedly installed on the water storage tank by screws.

Further, there are 8 outlet channels, which are evenly arranged on the circumferential side wall of the impeller chamber, that is, a water delivery pipe is installed every 45 degrees. .

Further, the servo motor is installed on the motor base.

The impeller chamber of the present invention is made of transparent plexiglass material, and the flow conditions of the flow field around the impeller can be photographed by using the particle image velocity measurement technology when the device is working. The water flows through the upper and lower orifice plates and enters the flow stabilizer, and finally flows back to the inlet of the impeller chamber. The impeller rotates to do work, and the water flow is thrown out by the centrifugal force and enters the impeller chamber, thus realizing a cycle.

Technical concept of the present invention has following characteristics:

(1) Visualization technology: The flow of the flow field around the impeller is photographed by a high-speed camera, and the performance of the impeller is measured from qualitative to quantitative by particle tracing, which is more conducive to the research of the impeller.

(2) Fluid drainage: Two drainage plates are installed at the impeller chamber, and the drainage plates divide the outlet flow channel into an S-shaped flow channel. While not increasing the radial dimension, the flow of the liquid is increased to make the flow more stable. Stablize.

(3) Flow control: Two orifice plates are installed at the outlet of the water storage tank, and the two orifice plates can be rotated relative to each other. When rotating, the size of the small holes will change, thereby changing the flow rate; A fastening device is developed. By turning the rotary head on the upper orifice plate downward until it bears against the lower orifice plate, the upper orifice plate is restricted by the buckle and cannot move upwards, so as to achieve the effect of fastening.

The beneficial effects of the present invention are reflected in:

1. The device of the present invention is simple and compact in structure, easy to operate, low in manufacturing cost and tooling cost, and occupies a small space.

2. In the present invention, the motor drives the impeller to rotate, and the impeller drives the entire fluid flow to realize circular flow.

3. The present invention adds two staggered diversion plates at the outlet flow channel of the impeller, without increasing the lateral size of the device, the outlet flow channel becomes longer, the outlet flow is more stable, and the water outlet pipe and the impeller are better eliminated. static and dynamic interference effect.

4. In order to control the flow at the inlet of the impeller, an upper and lower orifice plate is installed at the outlet of the water storage tank. By rotating the upper orifice plate, the area of the water passing hole is changed, thereby easily changing the flow rate, which not only plays the role of a valve, but also Can play a rectification effect.

5. In order to control the rotation distance of the orifice plate easily and accurately, a rotatable rotating head with thread is installed on the orifice plate, and the rotating head can be turned in or out to control the tightness of the two orifice plates, so that The orifice plate does not rotate during operation.

6. The material of the impeller chamber of the present invention is made of visualized material, and the fluid flow around the impeller can be intuitively understood through the high-speed camera when the device is working.

Description of drawings

Figure 1 is a schematic diagram of a visual centrifugal pump impeller test device.

Figure 2 is a schematic diagram of the orifice plate.

detailed description

Referring to Fig. 1 and Fig. 2, the centrifugal pump impeller visual test device includes a bracket 1 and an impeller chamber 2 installed on the bracket 1. The impeller chamber 2 has a hollow water diversion chamber and is made of transparent organic glass material. The water diversion chamber is provided with a water injection port 6 and an impeller 3 is installed in the center, and also includes a servo motor 12, a water storage tank 11 and a transmission shaft 4, and the servo motor 12 is connected with the transmission shaft 4 through a coupling, and the The transmission shaft 4 passes through the water storage tank 11 and the impeller chamber 2 in turn and is connected with the impeller 3 in transmission;

The circumferential side wall of the impeller chamber 2 is provided with a number of outlet channels, and the several outlet channels are respectively connected with the water delivery pipe 7, and the water storage tank 11 is correspondingly provided with a number of water inlets, and the delivery The water pipe 7 is connected with the corresponding water inlet;

A water outlet is provided on the side wall of the water storage tank opposite to the inlet channel of the impeller chamber 2, and an upper orifice plate and a lower orifice plate are installed at the water outlet, and the upper orifice plate can be relatively lower. The orifice plate rotates; the impeller 3 is arranged at the center of the end of the inlet channel.

Further, a flow stabilizer 16 is provided at the front end of the inlet channel of the impeller chamber 2 .

Further, the upper orifice plate and the lower orifice plate have the same structure, and both the upper orifice plate and the lower orifice plate are provided with a plurality of circles of water passing holes arranged in a ring shape. By rotating the upper and lower orifice plates, the size of the water hole is changed to control the flow.

Further, the upper orifice plate is fixed on the water storage tank 11 by screws, and a threaded through hole is provided on the lower orifice plate, and a threaded rotating head 9 is arranged in the threaded through hole, and the rotating head 9 of the rotating The head 9 can be screwed into or out of the threaded through hole, and the distance between the upper orifice plate and the lower orifice plate can be adjusted by the rotating head 9 .

Further, a buckle 8 is provided between the water storage tank 11 and the upper orifice plate, the buckle 8 is an L-shaped structure, one end of the L-shaped knot is fixedly connected to the water storage tank, and the other end leans against the The upper surface of the upper orifice plate.

Further, diversion plates 5 for increasing fluid flow are arranged in a staggered manner in several outlet channels, and the outlet channels are divided into S-shaped channels by the diverter plates 5 .

Further, the transmission shaft 4 is connected to the water storage tank 11 through a bearing 15, and a bearing installation hole is provided on the water storage tank 11, and one end of the bearing 15 abuts against the bearing installation hole, and the other end of the bearing cover plate 14 against each other, and the bearing cover plate is fixedly installed on the water storage tank by screws.

Further, there are 8 outlet channels, which are evenly arranged on the circumferential side wall of the impeller chamber, that is, a water delivery pipe 7 is installed every 45 degrees.

Further, the servo motor 12 is installed on the motor base 13 .

During the specific implementation of this embodiment, the servo motor 12 is connected to the transmission shaft 4 through a coupling, and the transmission shaft 4 passes through the water storage tank 11, the upper orifice plate 10, the lower orifice plate, and the flow stabilizer 16 to be connected to the impeller 3, and then drives the impeller 3 rotates, and the centrifugal force generated by the rotation of impeller 3 will drive the fluid to flow to both sides. A drain plate 5 is installed at the outlet channel of the impeller chamber 1, and the drain plate is fixed on the outlet channel with glue. The drain plate 5 increases the flow of the fluid. While reducing the lateral dimension, the fluid flow is more stable. Fluid flows into the water storage tank 11 through the water delivery pipe 7. There are 8 water delivery pipes 7, one is installed every 45 degrees, and they are connected to the water storage tank 11 respectively. It consists of two circular upper and lower orifice plates with the same size and the same size and number of holes. As shown in FIG. 1 , the lower orifice plate is fixed on the water storage tank 11 by screws, and the upper orifice plate is not fixed on the water storage tank and can rotate freely.

Figure 2 is a schematic diagram of the structure of the upper orifice plate or the lower orifice plate, the size of the water passing hole can be changed by rotating the upper orifice plate, so that the flow rate can be changed. The rotating head 9 on the upper orifice plate is to fasten the two orifice plates so that the two orifice plates do not move relative to each other. When the rotating head rotates downward, the rotating head will withstand the lower orifice plate, and the upper orifice plate will be buckled by 8 It is restricted and cannot go upward, so that the two orifice plates are fastened and cannot move relative to each other, and the flow rate will not change during work. After flowing through the orifice, the fluid flows to the flow stabilizer 16, and then returns to the inlet of the impeller to realize a cycle.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. Equivalent technical means that a person can think of based on the concept of the present invention.

Claims (9)

1. Centrifugal pump impeller visualization test device, including a bracket and an impeller chamber installed on the bracket, the impeller chamber has a hollow water diversion chamber and is made of transparent organic glass material, and the center of the water diversion chamber is equipped with an impeller, which It is characterized in that it also includes a servo motor, a water storage tank and a transmission shaft, the servo motor is connected with the transmission shaft through a coupling, and the transmission shaft passes through the water storage tank and the impeller chamber in sequence and connects with the impeller transmission connection; The circumferential side wall of the impeller chamber is provided with a number of outlet flow channels, which are respectively connected to the water delivery pipes, and the water storage tank is correspondingly provided with a number of water inlets, and the water delivery pipes are connected to the corresponding connected to the water inlet; A water outlet is provided on the side wall of the water storage tank opposite to the inlet channel of the impeller chamber, and an upper orifice plate and a lower orifice plate are installed at the water outlet, and the upper orifice plate can be opposite to the lower hole. The plate rotates; the center of the end of the inlet channel is provided with the impeller. 2. The centrifugal pump impeller visualization test device according to claim 1, characterized in that: a flow stabilizer is provided at the front end of the inlet channel of the impeller chamber. 3. The centrifugal pump impeller visual test device according to claim 1 or 2, characterized in that: the upper orifice plate and the lower orifice plate have the same structure, and the upper orifice plate and the lower orifice plate are equipped with There are a plurality of circles of water passing holes arranged in a ring shape. 4. The centrifugal pump impeller visualization test device as claimed in claim 3, characterized in that: said upper orifice plate is fixed on the water storage tank by screws, said lower orifice plate is provided with a threaded through hole, said A threaded rotating head is arranged in the threaded through hole, and the rotating head can be screwed into or out of the threaded through hole, and the distance between the upper orifice plate and the lower orifice plate is adjusted by the rotating head. 5. The centrifugal pump impeller visualization test device as claimed in claim 4, characterized in that: a buckle is arranged between the water storage tank and the upper orifice plate, the buckle is an L-shaped structure, and the L One end of the type knot is fixedly connected with the water storage tank, and the other end leans against the upper surface of the upper orifice plate. 6. The centrifugal pump impeller visualization test device as claimed in claim 5, characterized in that: several outlet channels are staggered with diversion plates for increasing fluid flow, and said diversion plates divide the outlet channels into S type flow channel. 7. The centrifugal pump impeller visualization test device as claimed in claim 6, characterized in that: the transmission shaft and the water storage tank are connected by a bearing, the water storage tank is provided with a bearing installation hole, and one end of the bearing is It abuts against the bearing installation hole, and the other end abuts against the bearing cover plate, and the bearing cover plate is fixed and installed on the water storage tank by screws. 8. The centrifugal pump impeller visualization test device according to claim 7, characterized in that: there are 8 outlet channels, which are evenly arranged on the circumferential side wall of the impeller chamber. 9. The centrifugal pump impeller visual test device according to claim 8, characterized in that: said servo motor is installed on the motor base.