WO2009052674A1

WO2009052674A1 - A coanda-effect jet type sprinkler

Info

Publication number: WO2009052674A1
Application number: PCT/CN2007/003823
Authority: WO
Inventors: Shouqi Yuan; Hong Li; Xingye Zhu; Qingjiang Xiang; Jie Zhang; Junping Liu
Original assignee: Jiangsu University
Priority date: 2007-10-26
Filing date: 2007-12-27
Publication date: 2009-04-30
Also published as: CN101224444B; CN101224444A

Abstract

A Coanda-effect jet type sprinkler includes a sprinkler body (5), a spraying pipe (6), a rotary sealing mechanism, a limiting ring (3), a directional selecting mechanism (4) and a jet element (8),wherein the jet element (8) is composed of a reversing air-supply joint (9), a signal-water joint (10), an outlet cover plate (11), a signal-water nozzle inlet (12) and a flow-induction pipe (13). The signal-water joint (10) and the reversing air-supply joint (9) under the signal-water joint (10) are provided on one side of the outer wall of the jet element (8), and the signal-water nozzle inlet (12) is arranged on the other side. The signal-water joint (10) is connected with the signal water nozzle inlet (12) via the flow-induction pipe (13). The outlet cover plate (11) is mounted on the jet element (8). Signal water from the signal-water nozzle inlet (12) acts on one side of the main jet to form discontinuously a low-pressure vortex area. When the reversing air-supply joint (9) opens or closes, the other side of the main jet switches between high and low pressure. This causes a pressure difference to form on either side of the main jet, and causes Coanda-effect flow which induces the sprinkler to turn from straight to intermediate to reverse outlet flow.

Description

Wall jet nozzle

Technical field

The invention belongs to the key equipment in the water-saving irrigation sprinkler irrigation system, and particularly refers to the wall-mounted jet nozzle.

Background technique

At present, the shortage of fresh water resources is a major global issue, and sprinkler irrigation has become an important means of sustainable agricultural development. The nozzle is the key equipment of the sprinkler irrigation system, and its performance directly affects the sprinkler irrigation effect. The rotary nozzle with more applications is a rocker type nozzle, which has a complicated structure and low energy conversion rate. Nowadays, jets have established a new position in control technology. Foreign scholars have not used jet technology to develop nozzles.

After the search, the relevant related patents include Han Xiaoyang et al. Utility model patent "Double-click synchronous full-jet nozzle" 90200784. X, Xie Fuqi et al. Utility model patent "All-jet nozzle" 03222424, Li Hong et al. Invention patent "Full jet" Micro sprinklers" 200610096781. 4. The "double-click synchronous full-jet nozzle" adopts the orifice control signal to intercept the signal water in the water nozzle, and the reverse mechanism is complicated. In the "full jet nozzle", the air supply hole of the gas-water separator is used to fill in the air, and the gas-water separator may not work properly due to the blockage. "Full jet micro-sprinkler" The nozzle rotates by the taper to drive the nozzle, and the fan-shaped spray function cannot be completed.

Summary of the invention

SUMMARY OF THE INVENTION The object of the present invention is to provide a wall-mounted jet nozzle which is simple in structure and reliable in operation in view of the deficiencies in the above spraying work.

The invention includes a swivel joint, a hollow shaft, a spray body, a spout, a rotary seal mechanism, a limit ring, a reversing mechanism, a reverse plastic tube, and a fluidic element body. The hollow shaft is connected to the pipeline through the rotating joint, the spray body is connected with the hollow shaft, and the nozzle is connected with the spray body. The rotary sealing mechanism is located inside the spray body to prevent the nozzle from leaking. The reversing mechanism is located in the middle of the spray body, and is connected to the reverse air supply nozzle through the reverse plastic tube. The limit ring is located on both sides of the reversing mechanism to control the rotation angle of the reversing mechanism. The utility model is characterized in that the fluid element body is composed of a reverse air supply nozzle, a signal water nozzle, an outlet cover plate, a signal water inlet nozzle and a flow guiding tube. On the outer wall of the fluidic element body, one side is provided with a signal water nozzle and a reverse air supply nozzle located below, and the other side is provided with a signal water inlet nozzle, and the signal water nozzle is connected with the signal water inlet nozzle through the flow guiding tube. An outlet cover is disposed at an upper end of the fluidic element body. By using the water wall attachment effect, the interception and flow of the signal water in the signal water nozzle makes the low-pressure vortex area intermittently formed on one side of the main jet, and the reverse air supply nozzle opens and closes to switch between the high and low pressures on the other side of the main jet. Thereby, a pressure difference is formed between the left and right ends of the main jet, the wall of the water flow is realized, and the direct, stepping and reverse running of the nozzle are completed.

The water intake of the signal water nozzle includes two ways of water intake in the working area and outside the cover. The water extraction method outside the cover plate can be Overcoming the shortcomings of the nozzle that the nozzle does not work properly due to the wear of the signal water nozzle makes the nozzle work more stable and reliable. The invention has the advantages that: due to the effective and convenient control of the interception of the signal water in the signal water nozzle, the limit ring can effectively control the opening or closing of the reverse air supply nozzle, and the nozzle can be self-controlled to complete the discontinuity. The stepping and reverse working, realizing the fan-shaped spraying function, the work is stable and reliable, and the endurance test proves that the nozzle can work for more than 3,000 hours.

DRAWINGS

Figure 1 is a schematic view of the structure of a wall-mounted jet nozzle.

Fig. 2 is a schematic view showing the fluid element body of the first embodiment.

Fig. 3 is a schematic view showing the fluid element body of the second embodiment.

Figure 4 is a view taken along line A of Figure 2 or Figure 3.

Figure 5 is a schematic view of the direct state of the present invention

6 is a schematic diagram of a step state of the present invention

Figure 7 is a schematic view of the reverse state of the present invention

Figure 8 is a comparison of rainfall distribution in different embodiments.

In the figure, 1. swivel joint, 2. hollow shaft, 3. limit ring, 4. reversing mechanism, 5. spray body, 6. nozzle, 7. reverse plastic tube, 8. jet element body, 9. Reverse air supply, 10. Signal water nozzle, 11. Exit cover, 12. Signal water into the nozzle, 13. Guide tube

detailed description

As shown in Figures 1, 2, and 3, the present invention includes a flow passage composed of a hollow shaft (2), a spray body (5), and a nozzle (6), a swivel joint (1), and a limit ring (3). , a reversing mechanism (4), a reverse plastic tube (7), a fluid element body (8), etc., wherein the fluid element body (8) is composed of a signal water nozzle (10), a signal water inlet nozzle (12), a counter It consists of a gas supply nozzle (9), an outlet cover plate (11), and a draft tube (13). The reverse plastic tube (7) is connected to the reverse air supply nozzle (9), and the working state of the nozzle includes three states: direct, step, and reverse.

Embodiment 1: The signal water nozzle is set in the working area of the component chamber to take water as follows - direct state: as shown in Fig. 5, water flow is sprayed from the hole D into the active area, from the A-direction view shown in Fig. 4. It can be seen that the main jet is ejected from the central circular hole, and the left and right ends of the main jet are separated from each other, and the air at both ends cannot be circulated. The reverse air supply nozzle (9) on the left side of the water jet element body is opened, thereby supplying air to the left cavity, and the gap C between the right side outlet of the component and the water beam is filled with air, so that the pressures on the left and right sides are substantially equal. The main jet is in a direct state and the nozzle is stationary. At the same time, the signal water nozzle (10) obtains signal water on the left edge of the water beam, and the obtained signal water flows in the direction of the signal water inlet nozzle (12) in the draft tube (13).

Stepping state: As shown in Fig. 6, the signal water in the signal water nozzle (10) is taken out into the water nozzle (12), the gap C is getting smaller and smaller, and finally blocked, the right side causes a low pressure vortex zone, and the left side pressure is stronger than Right. When the differential pressure reaches a certain value, the main jet flows to the right side of the wall, and the water flow passes through the chamfer of the outlet cover (11) to generate a driving force to the nozzle to rotate the nozzle to the right. In the Coanda state, due to the bending of the main jet, the signal water nozzle (10) is emptied without any signal water and only receives air. After the signal water in the draft tube (13) is pumped out, the air enters the water inlet hole (12) through the draft tube (13), the pressure on both sides is equal, and the main jet returns to direct radiation, so that the nozzle repeats itself, and the nozzle automatically completes the direct step by one step. Directly ... action.

Reverse state: As shown in Figure 7, the reverse plastic tube (7) is connected to the reversing mechanism (4), the adjustment limit ring (3) can control the angle of the nozzle spray, and the nozzle is stepped to the reversing mechanism (4) When the limit ring is used, (3) is restricted, the reverse air supply nozzle (9) is blocked, no air is added in the left cavity, a low-pressure vortex area is formed, and air is still filled in from the gap C in the right cavity. The right side pressure is stronger on the left side, the main jet is attached to the left side, and the left side of the nozzle is continuously rotated in the opposite direction. Rotate to the other side of the limit ring, the reverse air supply (9) is reopened, the air enters the left chamber, and the pressure difference with the right chamber is balanced, and the reverse operation is terminated and the direct light is restored. Repeatedly cycled, the wall-mounted jet nozzle automatically completes the direct step by one step... the reverse direction always shoots a step... spray operation.

Embodiment 2: The process of taking water from the signal water nozzle outside the cover is as follows:

The water flow is sprayed from the hole D into the action zone, and a low-pressure vortex zone is formed at the left and right ends of the action zone. The left side of the nozzle is ventilated by the reverse air supply nozzle (9) through the reverse plastic tube (7), and the right side is conditioned by the signal water nozzle (10). The pressure on both sides is equal, the water flow is direct, and the nozzle is stationary. In the signal water nozzle (10), the signal water is taken out into the signal water inlet nozzle (12), so that there is no air on the right side, and the low pressure vortex area is formed on the right side. The left side pressure is stronger on the right side, the main jet is attached to the right side, and the water flow passes. The chamfer of the outlet cover (11) exerts a driving force on the nozzle to cause the nozzle to rotate in steps. At this time, since the water flow is attached to the right side in the action area, the chamfering of the cover is deflected to the right side at the exit, and the signal water nozzle (10) is emptied to obtain any signal water, and only the air is received. After the signal water in the flow tube (13) is pumped out, the air enters the signal water into the water nozzle (12), the pressure on both sides is equal, the main jet returns to direct radiation, and thus the cycle is repeated, and the nozzle self-control completes the direct shot and shoots one step at a time. The reverse plastic tube (7) is connected to the reverse mechanism (4) when stepping to the reverse mechanism (4) Restricted by the limit ring (3), the reverse air supply (9) is blocked, the left side creates a low-pressure vortex zone, the right side pressure is stronger than the left side, the main jet reverses the wall, and the nozzle rotates in the opposite direction. On the other side of the limit ring (3), the reverse air supply (9) is reopened, the air enters the left chamber, and the pressure difference between the right chamber and the right chamber is balanced, and the reverse operation is terminated and the direct light is restored. Such repeated cycles, the external water intake wall jet nozzle automatically completes the direct one step by one... the reverse has been shooting a step... spray operation.

The invention is compared with the PY2 rocker arm nozzle produced by Zhejiang Xinchang Sprinkler Factory. The experimental data is shown in the following table. Among them, the experimental data of PY2 rocker arm nozzle is from the measured value, JB/T 7867-1997 is the machinery industry standard of the People's Republic of China released on June 20, 1997.

Table 1. Flow, range, sprinkler intensity comparison

Table 2. Raindrop end diameter It can be seen from the experimental results that the water jet performance of the water jet nozzle outside the cover plate is better than that of the water jet nozzle in the working area. They have reached the requirements of JB/T 7867-1997, and the spray head is evenly sprayed under the premise of meeting the required performance parameters. The performance of the sex and raindrops is significantly better than that of the PY2 rocker arm.

Claims

Rights request

1. A wall-mounted jet nozzle comprising a swivel joint (1), a hollow shaft (2), a spray body (5), a nozzle (6), a rotary sealing mechanism, a limit ring (3), a reversing direction The mechanism (4), the reverse plastic tube (7), and the fluid element body (8), wherein the hollow shaft (2) is connected to the pipe through the swivel joint (1), and the spray body (5) is connected to the hollow shaft (2) The nozzle (6) is connected to the spray body (5), the rotary sealing mechanism is located inside the spray body (5), the reversing mechanism (4) is located in the middle of the spray body (5), and the reverse plastic tube (7) and the reverse The air supply nozzles (7) are connected, and the limit ring (3) is located on both sides of the reversing mechanism (4), characterized in that the jet element body (8) is composed of a reverse air supply nozzle (9), and a signal water nozzle (10) The outlet cover plate (11), the signal water inlet nozzle (12), and the flow guiding tube (13) are formed on the outer wall of the fluid element body (8), and a signal water nozzle (10) is disposed on one side thereof and below The reverse air supply nozzle (9) is provided with a signal water inlet nozzle (12) on the other side, and the signal water nozzle (10) is connected to the signal water inlet nozzle (12) via the flow guiding tube (13), and the fluid element body (8) The upper end is provided with an outlet cover (11).

2. The wall-mounted jet nozzle according to claim 1, wherein the water receiving position of the signal water nozzle (10) is outside the working area or outside the cover.