JPH0312355Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention is applicable to dust, chips, water droplets, fiber waste, gas,
This invention relates to a fume nozzle for obtaining a fume stream used for removing smoke, etc., or for drying, cooling, etc.

(Prior art and problems) Compressed gas is allowed to flow through one of the two converging channels, and its ejector action attracts and accompanies the fluid in the other channel, and the fluid is ejected from the injection port in an increased amount. There are various types of fume nozzles, but
The compressed gas injection part of conventional jet nozzles of this kind is generally provided with a plurality of small diameter holes or narrow grooves, which not only easily cause clogging but also is inconvenient to clean.
Moreover, the flow rate is adjusted using a pressure regulating device or a throttle valve provided upstream, resulting in expensive equipment.

(Objective of the present invention) An object of the present invention is to provide an inexpensive ejector-type jet nozzle with a simple structure that allows easy cleaning of compressed gas injection ports and allows fine and easy flow rate adjustment. The purpose is to

(Means for solving the problem) In order to achieve the above object, the present invention provides the injection port and the secondary gas inlet in the same axial relationship, and also directs the injection port of the compressed primary gas diagonally inward in the direction of travel. The injection port is formed in an annular shape oriented toward the direction of the injection port, and the gap between the annular injection ports can be adjusted using a screw.

(Example) The details of the present invention will be explained below based on the illustrated example.

On the inner peripheral surface of the cylindrical main body 1, there is a tapered secondary gas inlet 2 that gradually narrows from the rear end to the front, a throat part 3, a forward step part 4, and a primary gas inlet having a larger diameter than the throat part 3. In addition to sequentially forming a gas inflow chamber 5 and a female threaded portion 6, a primary gas supply pipe 7 communicating with the inflow chamber 5 is screwed and connected at right angles, and a spout 8 is provided at the front end thereof. In addition, a generally cylindrical nozzle member 10 with an inlet port 9 having a larger diameter than the throat portion 3 is attached at the rear end to a female threaded portion 6 from the front of the main body 1 at a male threaded portion 11 carved near the center of its outer periphery. Not only are screws inserted in the same axial relationship to form a flow path in the front-rear direction leading from the inlet 2 to the jet outlet 8, but the inlet 9 of the nozzle member 10 is provided with a two-stage groove that gradually narrows forward. This guide part 1 is provided with a guide part 12 consisting of a tapered surface.
A diagonally inward annular primary gas injection port 13 is formed between the nozzle member 2 and the forward step portion 4 of the main body 1, and an annular groove 14 is provided on the outer periphery near the rear end of the nozzle member 10 to inject the primary gas. The gas supplied from the supply pipe 7 is supplied to the jet port 13 in an averaged state.

A handle 15 with a knurled outer periphery is provided at a portion near the front end of the nozzle member 10, and a lock nut 16 with a knurled outer periphery is provided behind the handle 15 by screwing into the male threaded portion 11, and the main body 1 In order to visually check the degree of depth adjustment of the nozzle member 10, that is, the degree of gap adjustment of the primary gas jet ports 13, a plurality of scales 17 are provided on the outer circumferential portion of the main body 1 near the front end, and indicators 18 corresponding thereto are placed on the nozzle member. An O-ring 19 for airtightness is provided on the outer periphery of the handle 15 at 10, and an O-ring 19 for airtightness is interposed at an appropriate position of the sliding portion between the main body 1 and the nozzle member 10.

Based on the above configuration, the primary gas supply pipe 7 is connected to a pressure gas source (not shown) such as a compressor.
For example, by supplying compressed air or other pressure gas of about several kg/cm ³ to the inflow chamber 5,
A forward conical jet air stream is injected from the annular ejection port 13 in a uniform state in the inflow chamber 5, and a large amount of jet air is ejected from the inflow port 2 due to the ejector action accompanying the injection of this primary gas. The secondary gas can be sucked and ejected forward from the ejection port 8, and when adjusting the amount and pressure of the jet from the ejection port 8, it is necessary to adjust the movement of the main body 1 and the nozzle member 10. Annular injection port 1 under regulation
3. Narrow the gap as shown in Figure 2, or
This can be effectively done by adjusting the width as shown in the figure, and generally speaking, by narrowing the annular injection port 13, the ejection pressure and amount of ejection from the ejection port 8 can be increased.

The main body 1 and nozzle member 10 are preferably made of lightweight aluminum or aluminum alloy and anodized, and the secondary gas inlet 2 is preferably tapered at about 30 degrees to reduce inflow resistance. It is.

(Effects of the invention) As explained above, according to the invention, in addition to providing an annular injection port that faces obliquely inward and is formed by a step part and a guide part in the middle of the flow path at the center of the main body and the nozzle member, By making it possible to adjust and fix the opening degree of the injection port with a screw, it is possible to obtain a significantly increased amount of jet air based on the highly efficient ejector action. The amount of fumes can be obtained at a rate of 22 times higher than the amount of gas supplied, and the primary gas injection port can be easily expanded or contracted with a screw, so the pressure etc. of the primary gas supply source can be changed. Not only can the jet flow be arbitrarily adjusted to match the usage conditions, but even if the slit-shaped jet nozzle becomes clogged with foreign matter, it can be easily cleaned by widening the nozzle with a screw without disassembling it. There are effects such as being able to.

[Brief explanation of the drawing]

The drawings show the fume nozzle of the present invention in one embodiment, in which Fig. 1 is a perspective view, Fig. 2 is a vertical side view, and Fig. 3 shows only the main parts with the injection port expanded. FIG. DESCRIPTION OF SYMBOLS 1... Main body, 2... Secondary gas inlet, 4... Step part, 5... Inflow chamber, 6... Threaded part, 7... Supply pipe, 8... Spout port, 10... Nozzle member, 11...
...Threaded portion, 12...Guide portion, 13...Primary gas injection port, 16...Lock nut.

Claims (1)

[Scope of utility model registration request] In addition to providing a cylindrical nozzle member with an ejection port and a cylindrical main body with a secondary gas inlet so that they can be adjusted forward and backward in the same axial relationship by screwing together the screw portions of both, the main body A diagonally inward annular primary gas injection port formed by a stepped portion and a guide portion is provided inside the main body and faces forward in a state that expands and contracts as the main body and the nozzle member move forward and backward, and this injection port has a A blow nozzle comprising an inflow chamber and a supply pipe for primary gas so as to communicate with each other, and a lock nut for fixing the forward and backward positions of the main body and the nozzle member screwed onto the threaded portion.