CN201195138Y - Spray nozzle - Google Patents

Abstract

The utility model provides a nozzle, this nozzle include inflow passageway, vortex chamber and the passageway of effluenting, the inflow passageway along the tangential with vortex chamber intercommunication, the passageway of effluenting is followed the axial in vortex chamber with vortex chamber intercommunication, wherein, the through-flow cross-section of inflow passageway reduces. According to the nozzle provided by the utility model, because the inflow passageway has the cross-section of one part at least along the direction towards vortex chamber promptly to be greater than the through-flow cross-section of another part, that is to say, the through-flow cross-section of inflow passageway is uniform unanimous, and the through-flow cross-section of this inflow passageway apart from the nearer part of vortex chamber is less than the through-flow cross-section of another part apart from the farther of vortex chamber. Thus, at a constant flow rate, the flow rate of the liquid when passing through the other portion is greater than the flow rate when passing through the one portion, thereby increasing the flow rate of the liquid when flowing into the scroll chamber.

Description

a nozzle

technical field

The utility model relates to a nozzle, in particular to a nozzle for atomizing liquid.

Background technique

Nozzles that atomize liquids are widely used in many practical situations. For example, in agriculture, the nozzles can be used to evenly spray liquid pesticide solutions on crops; in the dust removal or desulfurization operations of flue gas, spraying A liquid that combines dust or sulfur dioxide with the liquid droplets that become mist, thereby achieving the effect of removing dust or sulfur dioxide. In a word, the role of this kind of nozzle is to convert a large amount of liquid into mist droplets and spray it to a predetermined area.

1 and 2 show a conventional nozzle 1 . As can be seen from Figures 1 and 2, the nozzle 1 includes an inflow channel 2, a vortex cavity 3 and an outflow channel 4, wherein the vortex cavity 3 is cylindrical, and the inflow channel 2 is along the circumference of the vortex cavity 3. Tangentially communicates with the vortex cavity 3 .

When working, the liquid flows into the vortex chamber 3 from the inflow passage 2 at a high speed through a conduit (not shown) communicating with the inflow passage 2, because the inflow passage 2 communicates with the vortex chamber 3 along the tangential direction of the circumference of the vortex chamber 3, thus After the liquid enters the vortex chamber 3, its flow direction is forcibly changed, and it can only rotate at high speed along the inner wall of the vortex chamber 3, and a high-speed rotating liquid film is formed on the surface of the inner wall. At the same time, there is little liquid distributed in the central part of the vortex chamber 3 , so that an air column is formed in the central part of the vortex chamber 3 . When the liquid is ejected from the outflow channel 4 in the form of a liquid film, the liquid film is broken, and then forms tiny droplets to be sprayed out. Since the center part of the vortex chamber 3 is basically a hollow air column, the liquid is formed into a hollow conical mist after being sprayed out from the nozzle 2 .

However, in this conventional nozzle 1, since the cross-sectional area of the inflow channel 2 is uniform before entering the vortex chamber 3, the flow rate of the liquid entering the vortex chamber 3 directly depends on the flow rate of the liquid passing through the conduit, and also That is to say, the flow velocity when the liquid just flows into the flow channel 2 from the conduit is equal to the flow velocity when the liquid just flows into the vortex chamber 3 from the inflow channel 2 .

When it is necessary to increase the flow velocity of the liquid in the vortex chamber 3 so that the droplets sprayed by the nozzle 1 are more uniform and distributed more uniformly, the driving device (such as a pump) that drives the liquid into the nozzle 1 can only be increased. ) driving force to increase the flow into the inflow channel 2, but it also increases the load of the driving device. However, under a certain flow rate, it is difficult for conventional nozzles to increase the flow rate of the liquid entering the vortex cavity 3 .

Utility model content

The purpose of the utility model is to overcome the defect that the traditional nozzle is difficult to increase the flow rate of the liquid entering the vortex cavity when the flow rate is constant, and to provide a nozzle that can increase the flow rate of the liquid entering the vortex cavity.

The utility model provides a nozzle, which comprises an inflow channel, a vortex cavity and an outflow channel, the inflow channel communicates with the vortex cavity along the tangential direction, and the outflow channel is along the vortex cavity Axially communicates with the vortex chamber, wherein the flow cross section of the inflow channel is reduced.

According to the nozzle provided by the utility model, since the flow section of the inflow channel is reduced, the flow velocity in the inflow channel of the liquid becomes larger when the flow rate is constant, thereby increasing the flow velocity of the liquid when it flows into the vortex cavity. .

Description of drawings

Fig. 1 is the schematic diagram of the external shape of traditional nozzle;

Fig. 2 is a schematic diagram of the internal cavity structure of the nozzle shown in Fig. 1;

Fig. 3 is a schematic diagram of the external shape of the nozzle according to an embodiment of the present invention;

Fig. 4 is a schematic diagram of the internal cavity structure of the nozzle shown in Fig. 3;

Fig. 5 is a side view of the inner cavity structure of the nozzle shown in Fig. 4;

Fig. 6 is a top view of the inner cavity structure of the nozzle shown in Fig. 4;

Fig. 7 is an exploded view of the internal cavity structure of the nozzle shown in Fig. 4 .

Detailed ways

Specific embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

As shown in Figure 3 and Figure 4, the nozzle provided by the utility model includes an inflow channel 5, a vortex cavity 6 and an outflow channel 7, the inflow channel 5 communicates with the vortex cavity 6 along the tangential direction, and the outflow channel 7 is connected to the vortex cavity along the vortex. The axial direction of the swirl chamber 6 communicates with the swirl chamber 6 , wherein the flow cross section of the inflow channel 5 is reduced.

In the inflow channel 5, since the flow cross section of the inflow channel 5 is reduced, the flow velocity is naturally increased when the liquid flows through the portion with a smaller flow cross section.

According to one embodiment of the present invention, the inflow channel 5 includes a first port 8 and a second port 9 located at the intersection of the inflow channel 5 and the vortex chamber 6, and the flow cross section of the second port 9 is smaller than that of the first port 8. Flow cross section. In this way, the velocity of the liquid flowing through the second port 9 is greater than that of the first port 8 , thereby increasing the flow velocity of the liquid entering the vortex cavity 6 .

The change of the flow section of the inflow channel 5 can be realized in various forms. According to an embodiment of the present utility model, as shown in FIG. 4 and FIG. 7 , the inflow channel 5 is between the first port 8 and the second port 9 It also includes a first cylindrical passage 10, a truncated cone passage 11, a second cylindrical passage 12 and a third passage 14 connected in sequence, and the flow cross section of the first cylindrical passage 10 is larger than that of the second cylindrical passage 12. In this way, through the truncated conical channel 11 , the flow rate of the liquid flowing through the second cylindrical channel 12 is greater than the flow rate when flowing through the first cylindrical channel 10 , so that the flow rate can be increased.

The flow cross section of the second cylindrical channel 12 and the third channel 14 may be equal, in which case the flow velocity of the liquid in the second cylindrical channel 12 is equal to the flow velocity in the third channel 14 .

In a preferred situation, the flow section of the third channel 14 is smaller than the flow section of the second cylindrical channel 12, and the third channel 14 is composed of a cylindrical channel 15 with a rectangular cross-sectional shape and a semicircular semicircular cross-sectional shape. A channel 16 is formed, one side 17 of the cylindrical channel being tangential to the circumferential side of the swirl chamber 6 .

In this case, since the flow cross-section of the third passage 14 is smaller than the flow cross-section of the second cylindrical passage 12, the flow velocity of the liquid in the third passage 14 is greater than that in the second cylindrical passage 12, thereby further improving the flow rate of the liquid. At the same time, in order to realize the positional relationship between the inflow passage 5 and the vortex chamber 6 along the tangential communication, the third passage 14 is formed by a columnar passage 15 whose cross-sectional shape is a prism and a semicircular passage 16 whose cross-sectional shape is a semicircle. , one side 17 of the cylindrical passage is tangent to the circumferential side of the vortex cavity 6 . The tangency between the plane as side surface 17 and the circumferential surface as swirl chamber 6 is thus achieved.

The central axes of the first cylindrical channel 10 , the second cylindrical channel 12 and the third channel 14 may be the same or different to meet different applications.

After the liquid enters the vortex cavity 6 (cylindrical cavity) at high speed, the farther the central axis of the vortex cavity 6 is, the more liquid is distributed, and the liquid basically moves at a high speed along the circumferential side of the vortex cavity 6. Rotating movement, and the closer to the central axis of the vortex cavity 6, the less liquid is distributed, and there are almost no liquid droplets at the central axis, thereby forming a hollow air column. In order to adapt to the movement characteristics of the liquid in the vortex chamber 6, so that the droplets sprayed from the nozzle are distributed more evenly in the spray area, in the preferred case, the vortex chamber 6 is far away from the outflow channel. 7 and the inner surface opposite to the outflow channel 7 is a convex dome-shaped surface 18, as shown in FIG. 5 .

The outflow channel of the nozzle is described below. As shown in FIGS. 4 and 5 , the outflow channel 7 has a trumpet-shaped outlet 19 whose flow cross-section gradually increases in the direction of liquid flow. In this way, the distribution angle of the spray from the nozzle can be controlled by the opening angle of the trumpet-shaped outlet 19 .

Preferably, in order to increase the flow rate of the liquid flowing out of the vortex chamber 6 , the outflow channel 7 further includes a truncated conical channel 20 and a cylindrical channel 21 between the vortex chamber 6 and the outlet 19 in sequence. The flow section of the tapered channel 20 is reduced from the flow section of the vortex cavity 6 to the flow section of the cylindrical channel 21 along the direction of liquid flow. Through the conical channel 20, the liquid flow rate is increased, so that the distribution of the liquid droplets is more uniform, and at the same time, the size of the numerous liquid droplets is also more uniform.

According to the nozzle provided by the utility model, the flow velocity of the liquid entering the vortex chamber is increased through the reduction of the flow section of the inflow channel, thereby reducing the pressure drop level and improving the atomization level of the nozzle.

Claims (9)

1. A nozzle comprising an inflow channel (5), a vortex cavity (6) and an outflow channel (7), the inflow channel (5) is communicated with the vortex cavity (6) in a tangential direction, The outflow channel (7) is in communication with the vortex cavity (6) along the axial direction of the vortex cavity (6), and it is characterized in that the inflow channel (5) is directed toward the vortex cavity (6) The flow cross section in the direction decreases. 2. The nozzle according to claim 1, characterized in that, the inflow channel (5) comprises a first port (8) and a second port located at the intersection of the inflow channel (5) and the vortex cavity (6). Two ports (9), the flow cross section of the second port (9) is smaller than the flow cross section of the first port (8). 3. The nozzle according to claim 2, characterized in that, the inflow passage (5) further comprises first cylindrical passages ( 10), truncated cone channel (11), second cylindrical channel (12) and the third channel (14), the flow cross-section of the first cylindrical channel (10) is greater than the flow section of the second cylindrical channel (12) flow section. 4. The nozzle according to claim 3, characterized in that, the first cylindrical channel (10), the second cylindrical channel (12) and the third channel (14) have the same or different central axes. 5. The nozzle according to claim 3 or 4, characterized in that, the flow cross section of the third passage (14) is smaller than the flow cross section of the second cylindrical passage (12), and the third passage (14) is formed by the cylindrical channel (15) that cross-section shape is rectangular and the semicircular channel (16) that cross-section shape is semicircle, and one side (17) of described columnar channel and described vortex cavity ( 6) is tangent to the sides of the circumference. 6. The nozzle according to claim 1 or 2, characterized in that, the inner surface of the vortex cavity (6) away from the outflow channel (7) and opposite to the outflow channel (7) is Convex domed surface (18). 7. The nozzle according to claim 1 or 2, characterized in that, the outlet channel (7) has a trumpet-shaped outlet (19), and the flow section of the outlet (19) gradually changes along the direction of liquid flow. big. 8. The nozzle according to claim 7, characterized in that, the outflow channel (7) further comprises a truncated conical cone between the vortex cavity (6) and the outlet (19) channel (20) and cylindrical channel (21). 9. The nozzle according to claim 8, characterized in that, the flow section of the tapered channel (20) is narrowed from the flow section of the vortex cavity (6) to the cylinder along the direction of liquid flow. The flow cross section of the channel (21).

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