An annular jet device and a fog cannon

Abstract

The present invention belongs to the technical field of atomization devices, and in particular relates to an annular jet device and a fog cannon. The annular jet device includes a spray pipe and an air pipe connected to the spray pipe. The spray pipe includes an inner pipe, an outer pipe sleeved outside the inner pipe, an air flow cavity arranged between the outer pipe and the inner pipe, a jet channel arranged inside the inner pipe, a diversion ring arranged at the end of the inner pipe and curling into the air flow cavity until it is connected to the inner pipe, and a gas jet orifice in a slit shape is arranged between the diversion ring and the outer pipe. After the air flow passes through the annular jet device, it can drive the surrounding air into the air flow, and finally double the air flow of the wind force at the fog cannon outlet.

Description

Technical Field

[0001] The present invention belongs to the technical field of atomization devices, and in particular relates to an annular jet device and a fog cannon machine. Background Art

[0002] Fog cannon machines are often mounted on sanitation vehicles for dust suppression on urban roads and construction sites. A fog cannon machine mainly includes a wind barrel, a flow guiding cone coaxially fixed inside the wind barrel, an axial flow fan connected to one end of the flow guiding cone, and atomizing nozzles arranged in an annular distribution at the opening edge of the wind barrel. The working process of the fog cannon machine is mainly to transport water to the atomizing nozzles through a specific pipeline by a high-pressure water pump, and then the axial flow fan drives and pressurizes the outside air flow to be sucked into the wind barrel through the rotation of the fan blades, and sprays out at a high speed from the other end of the wind barrel through the guiding action of the guiding blades. At the same time, the high-speed jet gas ejected blows the water mist generated by the atomizing nozzles into the distance. The water mist combines with the dust particles in the air and aggregates into a group, and finally falls to the ground under the action of gravity, so as to achieve the purpose of dust removal.

[0003] At present, the common fog cannons for sanitation are classified by spray range into three specifications: 60 meters, 80 meters, and 120 meters. The axial flow fan is used for air supply. The axial flow fan has a large outer dimension and a long axial dimension. The fog cannon generally reaches 1.5 meters to 3 meters in the axial length, and the overall weight reaches 1.5 to 3 tons. It is not only huge in volume but also very heavy. The effective space of the whole vehicle is small, and the space available for arranging the water tank is small. The single water filling operation time of the whole vehicle is short. Secondly, although axial guiding blades are designed at the air outlet of the axial flow fan, the wind speed coming out is still a rotating air flow, which is not conducive to long-distance spraying. In addition, the existing fog cannons are heavy, resulting in a series of inevitable defects such as high energy consumption during the driving of the whole vehicle and short spray range. Most manufacturers have to increase the outer dimension of the fog cannon or increase the operating speed in order to improve the spray range, which further increases the weight and reduces the available space for other accessories such as the water tank. At the same time, it brings greater operating noise. In order to reduce the operating noise, the existing solution is to add a sound insulation layer on the outer barrel wall of the axial flow fan. This sound insulation layer not only increases the diameter of the wind barrel but also increases the overall weight and the driving energy consumption of the whole vehicle operation. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide an annular jet device and its fog cannon machine to increase the final air flow rate finally ejected by the fog cannon equipped with an axial flow fan, so as to solve the problems of small spray range and air supply distance.

[0005] The technical solution adopted by the present invention to solve its technical problems is to provide an annular jet device, including a nozzle, and an air pipe connected to the nozzle. The nozzle includes an inner pipe, an outer pipe sleeved outside the inner pipe, an air flow cavity arranged between the outer pipe and the inner pipe, a jet channel arranged inside the inner pipe, a guide ring arranged at the end of the inner pipe and curled into the air flow cavity until it is connected to the inner pipe, and a gas jet orifice in a slit shape is arranged between the guide ring and the outer pipe.

[0006] Furthermore, the inner pipe further includes a reduced-diameter pipe connected to the other end of the jet pipe, and a flared pipe connected to the reduced-diameter pipe.

[0007] Furthermore, the guide ring is connected in an O shape below the reduced-diameter pipe and bent into the air flow cavity until it reversely contacts the pipe wall of the reduced-diameter pipe.

[0008] Furthermore, the outer pipe includes an outer spray pipe inclined with the inner pipe, and an arc-shaped pipe connected to one end of the outer spray pipe.

[0009] Furthermore, the arc-shaped pipe is in a semi-circular groove shape, and the arc-shaped pipe is bent into the air flow cavity in an arc shape and forms a slit-shaped gas jet orifice with the inner pipe.

[0010] Furthermore, the gas jet orifice is arranged between the guide ring and the arc-shaped pipe.

[0011] Furthermore, the annular jet fog cannon further includes a water spray ring connected to the nozzle head of the nozzle.

[0012] Furthermore, the water spray ring includes a spray ring pipe in a ring shape along the circumference of the nozzle head, and atomizing nozzles evenly spaced on the spray ring pipe.

[0013] Furthermore, the atomizing nozzles of the high-pressure water spray ring are arranged at an angle of 30° with the axis of the spray ring pipe.

[0014] On the other hand, an annular jet device is provided, including the annular jet device as described above, and the annular jet device is arranged at the front end of the fog cannon.

[0015] The beneficial effects of the present invention are as follows: An air flow cavity is provided between the inner pipe and the outer pipe of the fog cannon of the present invention, and an annular slit-shaped gas injection port is provided between the inner pipe wall and the outer pipe wall. According to the wall attachment effect of fluid mechanics, the high-pressure gas will jet along the inner pipe at high speed from the slit. According to Bernoulli's principle, the high-speed flowing gas will form a low-pressure area, which will suck in the outside air and drive the surrounding air to form a wind force with a doubled flow rate. Therefore, under the same power of the fan, the fog cannon of the present invention has a longer air supply distance and spray range, and the operating energy consumption required to achieve the same effect is reduced. At the same time, the fog cannon of the present invention uses a centrifugal fan to provide wind force. The centrifugal fan with the same power is often quieter than the axial flow fan, so the operating noise can be greatly reduced. Moreover, compared with the axial flow fan, the centrifugal fan has the characteristics of high operating efficiency and can further achieve energy conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is a schematic structural diagram of the jet device of the present invention;

[0018] Figure 2 is Figure 1 a top view of the jet device shown;

[0019] Figure 3 is Figure 2 a cross-sectional view of the jet device shown along A-A;

[0020] Figure 4 is Figure 3 an enlarged view of the position B shown;

[0021] In the figure: air pipe 1, spray pipe 2, inner pipe 21, guide ring 211, reduced-diameter pipe 212, flared pipe 213, jet channel 22, air flow cavity 23, outer pipe 24, outer spray pipe 241, arc pipe 242, gas injection port 25, water spray ring 3, atomizing nozzle 31, spray ring pipe 32. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the present invention will now be described in detail with reference to the drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, so it only shows the components related to the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0023] As Figures 1 - 3As shown in the figure, this embodiment provides an annular jet device and a fog cannon machine thereof, including a spray pipe 2, an air pipe 1 connected to the spray pipe 2, and a water spray ring 3 connected to the outlet of the spray pipe 2. The spray pipe 2 includes an inner pipe 21 and an outer pipe 24. The outer pipe 24 is sleeved outside the inner pipe 21 in a tubular shape. There is an air flow cavity 23 between the inner pipe 21 and the outer pipe 24. The air flow cavity 23 is a high-pressure gas channel. The inner cavity of the annular inner pipe 21 is a jet channel 22. The air pipe 1 is connected to the outer pipe 24.

[0024] The inner pipe 21 includes a flared pipe 213 in a funnel shape, a reduced-diameter pipe 212 connected to one end of the flared pipe 213, and a diversion ring 211 connected to the reduced-diameter pipe 212 and curled into the air flow cavity 23 until it is connected to the reduced-diameter pipe 212. The diversion ring 211, the flared pipe 213, and the reduced-diameter pipe 212 are integrally formed. The diameter of the reduced-diameter pipe 212 is smaller than that of the flared pipe 213. The diversion ring 211 is in an O shape. The diversion ring 211 is connected below the reduced-diameter pipe 212 and bent into the air flow cavity 23 until it reversely contacts the pipe wall of the reduced-diameter pipe 212. The setting of the diversion ring 211 can reduce the air flow turning angle, reduce gas flow separation and internal flow loss, increase the gas jet speed, and play a role in making the gas flow from the inner pipe 21 along the diversion ring 211 to the gas jet port 25 and jetting out to the spray pipe 2.

[0025] The outer pipe 24 includes an outer spray pipe 241 arranged at an inclined angle with the inner pipe 21, and an arc-shaped pipe 242 that is arcuately bent into the air flow cavity 23 from the outer spray pipe 241. There is a gas jet port 25 between the diversion ring 211 and the arc-shaped pipe 242. High-pressure gas is blown in from the air pipe 1, and the high-pressure gas jets to the jet channel 22 from the gas jet port 25.

[0026] The water spray ring 3 includes an annular spray ring pipe 32 connected to the pipe head of the spray pipe 2, and atomizing nozzles 31 uniformly arranged on the spray ring pipe 32. The atomizing nozzles 31 atomize high-pressure water into micron-level water mist particles. The outlet of the atomizing nozzles 31 of the water spray ring 3 is arranged at an angle of 30° with the axis of the spray ring pipe 32, which is beneficial to the formation of a clustered mist, with good spraying effect and long spraying distance.

[0027] The fog cannon of the present invention is provided with high-pressure air flow by a centrifugal fan. The air outlet of the centrifugal fan is connected to the air pipe 1, and high-pressure air flow is blown in from the air pipe 1. The high-pressure air flow flows into the high-pressure gas channel. The high-pressure air flow is extruded from the slit-shaped gas ejection port 25. According to the wall attachment effect of fluid mechanics, the high-pressure air flow will flow at high speed along the inner walls of the diversion ring 211, the reduced-diameter pipe 212 and the flared pipe 213. According to Bernoulli's principle, the high-speed flowing gas will form a low-pressure area at the air flow. This low-pressure area will suck the high-pressure gas provided by the centrifugal fan into the jet channel 22 of the fog cannon, and then drive the movement of this part of the air by the viscosity of the gas. After the high-pressure gas sprays out of the nozzle of the fog cannon, it will also drive the external air movement around the nozzle, and converge it into the total air flow. The amount of the total moving air is much larger than the high-pressure gas itself, and finally the water mist sprayed out from the atomizing nozzle 31 is shot into the distance by the high-pressure air flow.

[0028] The air flow cavity 23 between the inner pipe 21 and the outer pipe 24 of the fog cannon of the present invention, that is, the cross-sectional area of the high-pressure gas channel is much larger than the size of the gas ejection port 25. Generally, the cross-sectional area of the high-pressure gas channel is 5 to 10 times that of the gas ejection port 25. The high-speed air flow carries the surrounding air forward. The total air flow passing through the cross-section of the flared pipe 213 will be several times the air flow rate of the gas ejection port 25δ of the gas ejection port 25, and the air flow direction is a uniform axial air flow. The velocity decay rate in the atmospheric environment is much smaller than the decay rate of the outlet spiral air flow of the existing axial flow fan. Therefore, under the condition of the same total outlet air flow rate, the fog cannon of the present invention has a farther spraying distance.

[0029] As Figure 3 shown, the dimensions of the fog cannon of the present invention have the following relationships:

[0030] D2 / D1 = (1.05 - 1.1), R3 / R1 = 2.3 - 2.8, R4 / R1 = 6.5 - 7, R2 / R1 = 0.4 - 0.6;

[0031] L1 = (0.4 - 0.6)D1.

[0032] Wherein: L1 is the distance from the bottom of the arc-shaped pipe 242 to the spray ring pipe 32, D1 is the diameter at the gas ejection port 25 of the outer pipe 24, D2 is the diameter of the inner pipe 21 nozzle, R1 is the cross-sectional radius of the arc-shaped pipe 242, R2 is the cross-sectional radius of the diversion ring 211, R3 is the radius of the reduced-diameter pipe 212, R4 is the maximum radius of the flared pipe 213, δ is the width of the gas ejection port 25, and α is the inclination angle at the jet ring.

[0033] Taking the finished products prepared according to the dimensional relationships in this embodiment as a comparison, they are processed into different dimensions for performance testing. The test results are shown in Table 1.

[0034] First, the rotational speed of the air supply impeller is given as 3000 rpm, the power of the fan is 35 kw, the air flow rate of the air supply fan is 9846 m 3 / h, the average outlet flow velocity is 51 m / s, and the total air flow rate is 82760 m 3 / h.

[0035] Table 1 Test Results

[0036]

[0037]

[0038] Among them, for the annular jet device with serial number 15, the inclination angle α of its jet ring is set to 15°, the width δ of the gas injection port 25 is set to 10 mm, the maximum radius R of the flared pipe is set to 450 mm. Finally, through prototype test, it is obtained that the flow velocity of the gas injection port 25 is 113 m / s, the average wind speed V at the outlet of the jet channel 22 is 53.6 m / s, and the total flow rate Q at the outlet of the jet channel 22 is 85658 m 3 / h. Compared with the air flow rate directly blown by the air supply fan, the air amplification multiple of this device is 8.4 times, and its effect is the best.

[0039] The fog cannon of the present invention adopts an annular jet device, and the air flow rate after high-speed jet of the gas is doubled. Compared with fog cannons that can reach the same spray range, the axial dimension of the fog cannon of the present invention is only about 15% of the size of the fog cannon under the existing technology, reducing the occupied space and the overall weight; at the same time, this fog cannon uses a centrifugal fan to provide high-pressure gas, which is ejected at high speed through the narrow gap of the air jet port 25. According to the wall attachment effect, the high-speed air flow will drive the surrounding air to form a wind with a doubled flow rate, and send the water mist atomized by the atomizing nozzle 31 at the outlet of the water spray ring 3 to a distance. Since the high-speed air flow drives the surrounding air to flow forward together after ejecting from the air jet port 25, driving the water mist ejected from the water spray ring 3 to flow forward, the total air flow rate increases by an order of magnitude. Therefore, if a fan with the same power is used, the fog cannon of the present invention increases the air supply distance and the spray range. If the same air supply distance and spray range are required, the operating energy consumption can be reduced; at the same time, the fog cannon of the present invention can use a centrifugal fan. A centrifugal fan with the same power usually has lower noise than an axial flow fan, which can greatly reduce the operating noise. Moreover, compared with an axial flow fan, the centrifugal fan has the characteristics of high operating efficiency and can further achieve energy saving.

[0040] In the description of the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.

[0043] Taking the above-mentioned ideal embodiments of the present invention as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the scope of the present invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An annular jet device, characterized in that, It includes a nozzle and an air pipe connected to the nozzle. The nozzle includes an inner pipe, an outer pipe sleeved outside the inner pipe, an air flow cavity arranged between the outer pipe and the inner pipe, a jet channel arranged inside the inner pipe, a guide ring arranged at the end of the inner pipe and curled into the air flow cavity until it connects with the inner pipe, and a gas injection port in a slit shape is arranged between the guide ring and the outer pipe. The outer pipe includes an outer nozzle obliquely arranged with respect to the inner pipe and an arc-shaped pipe connected to one end of the outer nozzle. The arc-shaped pipe is in a semi-circular groove shape, and the arc-shaped pipe is bent into the air flow cavity in an arc shape, and a gas injection port in a slit shape is formed between the arc-shaped pipe and the inner pipe. The included angle of the gas injection port with the vertical direction is α, the inclination angle α of the jet ring is set to 15°, and the air flow blown out by the air supply fan is magnified by 8.4 times by this device.

2. The annular jet device according to claim 1, characterized in that, The inner pipe further includes a reduced-diameter pipe connected to the other end of the jet pipe and a flared pipe connected to the reduced-diameter pipe.

3. The annular jet device according to claim 2, characterized in that, The guide ring is connected in an O shape below the reduced-diameter pipe and is bent into the air flow cavity until it contacts the pipe wall of the reduced-diameter pipe in the reverse direction.

4. The annular jet device according to claim 1, characterized in that, The gas injection port is arranged between the guide ring and the arc-shaped pipe.

5. The annular jet device according to claim 1, characterized in that, The annular jet fog cannon further includes a water spray ring connected to the nozzle head of the nozzle.

6. The annular jet device according to claim 5, characterized in that, The water spray ring includes a spray ring pipe in a ring shape along the circumference of the nozzle head and atomizing nozzles evenly spaced on the spray ring pipe.

7. The annular jet device according to claim 5, characterized in that, The atomizing nozzles of the high-pressure water spray ring are arranged at an angle of 30° with respect to the axis of the spray ring pipe.

8. A fog cannon, characterized in that, It includes the annular jet device according to any one of claims 1-7, and the annular jet device is arranged at the front end of the fog cannon.

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