JP2597330Y2 - Ejector - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ejector that allows a pressurized fluid to pass therethrough to suck and mix gas into the pressurized fluid, and more particularly to an ejector that has a small pressure loss, a simple structure, and a low manufacturing cost. It is.

[0002]

2. Description of the Related Art In a conventional ejector, as shown in FIG. 3, for example, a mixing chamber 1B is provided at a location where a suction fluid is sucked into a pressurized fluid, and the pressurized fluid and the suction fluid are mixed in the mixing chamber 1B. It was squirting toward the outlet while being mixed. That is, the ejector 1 shown in FIG. 3 comprises a main body 1A having a throat portion 4 and a diffuser portion 5, a nozzle 3A inserted into the inlet end of the main body 1A, and a nozzle presser 3B. The 3A mating location required machining. On the other hand, the production by such a cast product is expensive and the production period is long. As an alternative, an ejector 1 finished to a predetermined shape by cutting a round bar as shown in FIG. 4 is also used. It became so.

[0003]

[Problems to be Solved by the Invention] However, in the ejector of FIG. 3 described above, the structure of the suction part is complicated because the mixing chamber is provided, and a casting process and many machining processes are required. Delivery time increases. Further, since the structure of the suction section is complicated, the pressure loss of the fluid flowing in the ejector increases, and the pump power cost and equipment cost increase. In addition, in the ejector of FIG. 4, there is no casting process due to the cutting of round steel, and the production period is shortened accordingly, so that the production cost is lower than that of FIG. The nozzle 3A is still separate from the main body 1A, and high fitting accuracy is required in order to increase the concentricity of the two, and there has been a problem that the manufacturing cost and the manufacturing period are correspondingly increased.

[0004]

In order to solve the above-mentioned problems, an ejector according to the present invention comprises a cylinder and flanges joined to both ends of the cylinder, and the cylinder faces downstream in the axial direction. A through hole comprising a nozzle portion that is reduced in diameter and a throat portion connected to the nozzle portion and having the same inner diameter as the minimum diameter of the nozzle portion, and a diffuser portion connected to the throat portion and having a starting end that has the same inner diameter as the throat portion and expands in diameter. And a suction hole communicating with the throat portion and orthogonal to the axis of the cylinder is provided, and a screw hole for screwing a suction port fitting coaxially with the suction hole is provided on the outer periphery of the suction hole.

[0005]

In the ejector of the present invention, the pressurized fluid is injected from the nozzle of the ejector, so that the suction fluid is sucked from the suction hole provided at the throat connected to the end of the nozzle and orthogonal to the throat. Are mixed and stirred in a diffuser section connected to a throat section and discharged from an outlet. In the suction hole of the throat portion, a nozzle pipe having an arbitrary inner diameter is fitted to select a nozzle pipe inner diameter suitable for the pressure, flow velocity and suction fluid flow rate of the pressurized fluid.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. 1 and 2 relate to an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of an ejector, and FIG. 2 is an enlarged longitudinal sectional view of a main part of the ejector. In the figure, a flange 2A, 2B is welded to both ends of a cylindrical main body 1 of an ejector 1, and inside the main body 1A, a nozzle portion 3 whose diameter decreases toward the downstream side in the axial direction and the same diameter as the nozzle portion 3 The throat portion 4 has a through hole formed of a diffuser portion 5 having the same diameter as the throat portion 4 and having a diameter increasing toward the downstream side. The position of the throat portion 4 is arranged closer to the inlet side at 20 to 30% of the entire length of the ejector 1, and the outer periphery of the suction hole 6 orthogonal to the throat portion 4 is threaded to form a screw hole 6A.
In the screw hole 6A, as shown in FIG.
The nozzle tube 7 having an appropriate inner diameter matching the speed and the suction amount of the suction fluid can be detachably screwed.

In the ejector 1 configured as described above, the pressurized fluid flows through the nozzle portion 3 at a high speed, so that the pressurized fluid has the highest speed in the throat portion 4 having the minimum diameter, and the pressure is reduced to reduce the negative pressure. Then, the suction fluid is sucked from the nozzle tube 7 having a very small diameter fitted into the suction hole 6, mixed with the pressurized fluid in the throat portion 4 and the diffuser portion 5 connected thereto, and integrally discharged from the outlet. You.

[0008] The ejector 1 of the present invention has a simple structure compared to a conventional ejector and is a cutting process with less shaving, so that the production cost is low and the production period is short. Further, since the flow path of the pressurized fluid inside the ejector 1 is continuous and there is no sudden change in cross section, the flow pressure loss of the fluid is extremely small. Also, the gas inflow hole to the throat section where the negative pressure is the largest
Has a structure that allows direct connection. Further, since the flow path diameter of the suction fluid can be changed according to the flow conditions (flow rate, pressure, suction volume) of the fluid, the versatility is high.

[0009]

[Effects of the Invention] As described above, the ejector of the present invention has a simple structure and a low manufacturing cost.
Low pressure loss and high versatility.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an ejector according to an embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a main part of the ejector according to the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional ejector.

FIG. 4 is a longitudinal sectional view of a conventional ejector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ejector 1A Main body 1B Mixing chamber 2A flange 2B flange 3 Nozzle part 3A nozzle 4 Throat part 5 Diffuser part 6 Suction hole 6A Screw hole 7 Nozzle tube

Claims (1)

(57) [Scope of request for utility model registration] The present invention comprises a cylinder and a flange joined to both ends of the cylinder. The cylinder has a nozzle portion that reduces in diameter toward a downstream side in an axial center direction and a minimum diameter of the nozzle portion connected to the nozzle portion. A throat portion having the same inner diameter and a through hole formed of a diffuser portion connected to the throat portion and having a starting end expanding at the same inner diameter as the throat portion are provided, and a suction hole communicating with the throat portion and orthogonal to the axis of the cylinder is provided. An ejector provided with a screw hole on an outer periphery of the suction hole, the screw hole being screwed concentrically with the suction hole.