CN106872158B - Experimental device for be used for studying venturi ejector and draw characteristic - Google Patents

Abstract

The invention discloses an experimental device for studying the ejection characteristics of a Venturi ejector, which includes a Venturi tube, a suction pipe, an air intake pipe, an exhaust pipe and a second air pump, wherein the Venturi tube Both ends are connected to the intake pipe and the exhaust pipe respectively; the front end of the suction pipe is connected to the contraction section of the venturi tube; the second air pump is connected to the intake pipe or the exhaust pipe; the intake pipe is provided with A first flowmeter; a second flowmeter is provided on the exhaust pipe; a first pressure gauge is installed on the exhaust end of the venturi tube; a third pressure gauge is installed on the inlet end of the venturi tube; the venturi tube A second pressure gauge is installed on the contraction section; a fourth pressure gauge is installed on the suction pipe. This experimental device solves the problem of optimizing the existing Venturi ejector to improve the ejector efficiency.

Description

An experimental device for studying the ejection characteristics of Venturi ejector

Technical field

The invention belongs to the technical field of fluid machinery and relates to an experimental device for studying the ejection characteristics of a Venturi ejector.

Background technique

Ejectors are widely used in industrial production. If a gas nozzle is located at the end of another thicker pipe, the gas (spray medium) can bring the surrounding gas (the sprayed medium) into the thicker pipe when it is sprayed out; and cause a certain amount of gas at the inlet end of the thick pipe. The negative pressure causes external gas to be sucked into the tube through the opening of the thick tube. This device is called an ejector. According to the interacting fluid state in the ejector, it is divided into three categories: gas ejector (the working fluid and the ejector fluid are in the same state), water-air ejector (the working fluid and the ejector fluid are in different states) ), steam-water ejector (ejector in which the fluid state changes). Ordinary ejector has the advantages of simple structure, easy processing and low cost, but there is a large energy loss when the two fluids are mixed. In addition, since there are no moving parts, it is not easy to adjust during operation. In contrast, the Venturi ejector not only has a simple structure and low manufacturing and maintenance costs, but also has the advantage of high efficiency in energy transfer. Therefore, it is necessary to optimize the injection characteristics of the Venturi ejector to obtain the optimal structural parameters and flow parameters under the maximum injection flow rate to improve the efficiency of the Venturi ejector.

Contents of the invention

In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an experimental device for studying the ejection characteristics of a Venturi ejector to solve the optimization of the existing Venturi ejector ejection, thereby improving the ejection Efficiency issues.

The present invention is achieved through the following technical solutions:

An experimental device for studying the ejection characteristics of a Venturi ejector, which includes a Venturi tube, a suction tube, an air inlet pipe, an exhaust pipe and a first air pump, wherein the two ends of the Venturi tube are connected respectively The air inlet pipe and the exhaust pipe; the front end of the suction pipe is connected to the contraction section of the venturi tube; the first air pump is connected to the air inlet pipe or the exhaust pipe; a first flow meter is provided on the air inlet pipe ; A second flow meter is provided on the exhaust pipe; a first pressure gauge is installed on the exhaust end of the venturi pipe; a third pressure gauge is installed on the inlet end of the venturi pipe; the contraction section of the venturi pipe is installed There is a second pressure gauge; a fourth pressure gauge is provided on the suction pipe.

Preferably, the suction pipe is provided with a stop valve.

Further preferably, the stop valve is provided between the venturi tube and the fourth pressure gauge.

Preferably, the exhaust pipe is provided with an exhaust valve, and the intake pipe is provided with an air intake valve.

Further preferably, the exhaust valve is arranged between the second flow meter and the venturi tube; the first flow meter is arranged between the intake valve and the venturi tube.

Preferably, the end of the suction pipe is connected to a second air pump.

Preferably, the first air pump is provided at the end of the air intake pipe.

Compared with the existing technology, the present invention has the following beneficial technical effects:

The invention provides an experimental device for studying Venturi ejection characteristics. By constructing Venturi tubes with different shrinkage ratios, passing mainstream gas into the Venturi tube, and using an air pump to adjust the pressure in the Venturi tube and the flow rate of the mainstream gas, thereby The vacuum suction of the venturi throat section is used to eject fluid. This experimental device can obtain the influence of the pressure difference between the inlet and outlet of the venturi tube, the inlet pressure of the suction tube and the contraction ratio of the venturi tube on the ejection amount. The experimental device has a reasonable structural design, is simple and compact, has a pressure of 0.1 to 1MPa, and a large adjustment range. Energy saving, environmental protection and low cost.

More advancedly, the air pump and the opening of the inlet and outlet valves of the venturi tube are used to change the jet inlet pressure and flow rate, and the ejection law of the venturi tube is further studied.

Description of the drawings

Figure 1 is a schematic structural diagram of an experimental device for studying the ejection characteristics of a Venturi ejector provided by an embodiment of the present invention.

Among them, 1 second air pump; 2 suction pipe; 3 stop valve; 4 venturi tube; 5 exhaust pipe; 6 exhaust valve; 7 second flow meter; 8 first pressure gauge; 9 second pressure gauge; 10 The third pressure gauge; 11 the fourth pressure gauge; 12 the first flow meter; 13 air inlet valve; 14 air inlet pipe; 15 the first air pump.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings:

Referring to Figure 1, the experimental device disclosed by the present invention for studying the ejection characteristics of a Venturi ejector includes a Venturi tube 4, a suction pipe 2 and a first air pump 15; the left side of the Venturi tube 4 is connected with an inlet in sequence. The air pipe 14 and the first air pump 15 are installed with an air inlet valve 13 and a first flow meter 12 on the air inlet pipe 14 . A suction pipe 2 is installed above the contraction section of the venturi tube 4. The other end of the suction pipe 2 is connected to a second air pump 1. A fourth pressure gauge 11 and a stop valve 3 are installed on the suction pipe 2. A first pressure gauge 8 is installed at the exhaust end of the venturi tube 4; a third pressure gauge 10 is installed at the inlet end of the venturi tube 4; and a second pressure gauge 9 is installed at the contraction section of the venturi tube 4. An exhaust pipe 5 is installed at the outlet of the venturi tube 4 , and an exhaust valve 6 and a second flow meter 7 are installed on the exhaust pipe 5 .

The experimental device disclosed by the present invention for studying the emission characteristics of a Venturi ejector, when used:

At the beginning of the measurement test, pressurize the first air pump 15 and the second air pump 1 to P, first open the intake valve 13, then adjust the exhaust valve 6, and observe the first pressure gauge 8, the second pressure gauge 9 and the third pressure The values shown in Table 10. When the pressure stabilizes, adjust the opening of the stop valve 3 and observe the indication values of the first flow meter 12 and the second flow meter 7. When the indication value of the second flow meter 7 is greater than the indication value of the first flow meter 12, start Record the indications of the first and second flow meters (7,12) and the first, second, third and fourth pressure gauges (8,9,10,11). At this time, the air flow flowing into the venturi tube 4 through the intake pipe 14 is accelerated at the throat section of the venturi tube 4, the pressure drops, and the air flow from the suction pipe 2 is sucked. By adjusting the opening of the intake valve 13 and the exhaust valve 6 and changing the indications of the first, second and third pressure gauges (8, 9, 10), different inlet and outlet pressure differences can be changed. At the same time, adjust the opening of the stop valve 3, change the indication value of the fourth pressure gauge 11, and change the pressure of the suction pipe 2. In addition, the above measurement was repeated while changing the contraction ratio of the venturi tube 4. The main factors that determine the injection amount F2-F1 (the difference between the second flow meter indication value and the first flow meter indication value) are thus obtained. The main factors that affect the injection volume are the pressure difference between the inlet and outlet of the Venturi, the inlet pressure of the suction pipe and the contraction ratio of the Venturi tube. Based on the experimental data, the main factors affecting the injection amount are analyzed to obtain the optimal parameters under the maximum injection amount.

Claims (4)

1. An experimental device for studying the ejection characteristics of a Venturi ejector, characterized in that it includes a Venturi tube (4), a suction pipe (2) and a first air pump (15); the Venturi tube The two ends of (4) are connected to the air inlet pipe (14) and the exhaust pipe (5) respectively; the front end of the suction pipe (2) is connected to the contraction section of the venturi pipe (4); the first air pump (15) is connected to On the intake pipe (14) or exhaust pipe (5); where: The air inlet pipe (14) is provided with a first flow meter (12); the exhaust pipe (5) is provided with a second flow meter (7); The first pressure gauge (8) is installed at the exhaust end of the venturi tube (4); the second pressure gauge (9) is installed at the contraction section of the venturi tube (4); the air inlet end of the venturi tube (4) is installed There is a third pressure gauge (10); a fourth pressure gauge (11) is provided on the suction pipe (2); The suction pipe (2) is provided with a stop valve (3), and the stop valve (3) is provided between the Venturi tube (4) and the fourth pressure gauge (11); the exhaust pipe (5) An exhaust valve (6) is provided on the upper body, and the exhaust valve (6) is arranged between the second flow meter (7) and the venturi tube (4); the first flow meter (12) is arranged on the intake valve (6) Between the Venturi tube (4); The end of the suction pipe (2) is connected to the second air pump (1). 2. The experimental device for studying the ejection characteristics of a Venturi ejector according to claim 1, characterized in that an air inlet valve (13) is provided on the air inlet pipe (14). 3. The experimental device for studying the ejection characteristics of a Venturi ejector as claimed in claim 2, characterized in that the first flow meter (12) is arranged between the air inlet valve (13) and the Venturi tube ( 4) between. 4. The experimental device for studying the emission characteristics of a Venturi ejector according to any one of claims 1 to 3, characterized in that the first air pump (15) is arranged at the end of the air inlet pipe (14) .