JPH0563640B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ejector device, and more specifically, an ejector body is formed of at least two block bodies, and a nozzle part and a diffuser part are integrally constructed by combining these block bodies. The present invention further relates to an ejector device in which a surface serving as a fluid passage is formed to have a smooth surface.

BACKGROUND ART Ejectors have been conventionally used as devices for ejecting steam, air, or suction from a nozzle to suction air to create a vacuum. This type of ejector can generally be divided into a nozzle section and a diffuser section, and is configured to generate negative pressure by the pressure drop at the outlet of the nozzle section and kinetic energy.

By the way, in the ejector device according to the prior art, the nozzle part is configured separately from the diffuser part, and the nozzle itself is configured to be fitted into a plurality of wall parts, respectively, so that the assembly is difficult. It has been pointed out that it is not easy to assemble, and that a special sealing member is required to ensure airtightness, making assembly difficult and increasing manufacturing costs. Furthermore, if the surfaces of the nozzle section and the diffuser section are not smooth, the smooth flow of fluid may be hindered, which may reduce the negative pressure generation efficiency of the ejector device.
In other words, since the surface precision of the nozzle part and the diff user part affects the negative pressure generation efficiency of the ejector device, surface finishing of the nozzle part and the diff user part is required, and it has been pointed out that there is a drawback that the manufacturing specifications for the ejector device are complicated. .

Therefore, as a result of intensive studies and efforts, the present inventors configured the ejector separately from the first block body and the second block body, and the first block body and the second block body were made into a structure that was substantially linear. The shape is selected to form a symmetrical cubic or rectangular parallelepiped shape, and when these are combined, a nozzle part and a diffuser part are formed along the fluid flow direction, and the fluid flow in the first block body and the second block body is Coating the passageway surface with metal or plastic provides excellent airtightness, eases assembly, and reduces the number of parts, making it cheaper to manufacture. It has been found that the ejector device can be easily incorporated into the system, and the fluid flow is extremely smooth, so that an ejector device with high efficiency in generating negative pressure can be obtained, and the various disadvantages mentioned above can be eliminated.

Therefore, the object of the present invention is to have a simple structure, easy to assemble, easy to incorporate into other devices, and can be manufactured at low cost, and in addition, fluid can flow extremely smoothly and vacuum can be efficiently obtained. The purpose of the present invention is to provide an ejector device.

In order to achieve the above object, the present invention comprises an ejector main body separated into a symmetrically formed first block body and a second block body, and wherein the first block body and the second block body are separated from each other. The first block body and the second block body are joined along the flow direction of the fluid, and the bulges and slopes formed in the first block body and the second block body correspond to each other to form a nozzle part and a diffuser part, and the first block body and a fluid introduction port, a vacuum port, and a fluid exhaust port extending in a direction perpendicular to the flow direction of the fluid from the nozzle portion and facing each other in each of the second block bodies; The inner wall surface of the complete body that is surrounded by the first block body and the second block body and forms a fluid passage is subjected to a surface treatment to have a smooth surface.

Next, preferred embodiments of the ejector device according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates an ejector device, and this ejector device 10 is basically composed of a first block body 14a and a second block body 14b. As can be easily understood from the figure, the first block body 14a and the second block body 14b are constructed substantially line-symmetrically. Therefore, the first block body 14a will be explained here. In addition,
Regarding the second block body 14b, the reference numeral ``b'' for the constituent parts explained in the first block body 14a will be added, and redundant explanation of the same constituent parts will be omitted.

First, an air introduction port 20a is formed at one end of the first block body 14a, a vacuum port 22a is formed approximately at the center thereof, and an exhaust port 24a is formed at the other end. A nozzle part 26 is defined between the upper part of the first block body 14a and the second block body 14b by expanding the body part, and a chamber 28 and a chamber 30 are defined around this nozzle part 26. Ru. That is, the internal bulges 25a, 25b of the respective block bodies 14a, 14b
The nozzle portion 26 is formed by the slanted surfaces 27a and 27a of the bulging portions 25a and 25b that widen from each other.
A chamber 30 is formed by 27b. The chamber 28 includes a flat surface 31a having a hole communicating with the air introduction port 20a and a slope 31b inclined with respect to the nozzle portion 26. Further, as can be easily understood from the figure, the chamber 30 is configured to gradually expand in its cross section via an inclined surface 31a extending from the nozzle section 26, and thereby the diff user section will be formed. As shown in FIG. 2, the nozzle portion 26 has a rectangular cross section rather than the cylindrical nozzle that constitutes the ejector of the prior art, and its side portions meet the surface 31d.
and 31e.

Here, chromium plating 32 is applied to the fluid passage formed inside the ejector device 10. That is, since the first block body 14a and the second block body 14b are formed of cast metal or the like, their surfaces are not quite smooth and may impede the smooth flow of fluid.

Therefore, this fluid passage, that is, a surface from the air introduction ports 20a, 20b to the nozzle part 26 via a narrow passage, a surface from the vacuum ports 22a, 22b to the chamber 30 via a narrow passage, and a flat surface. 31a, slopes 31b, 31c and side surfaces 31d,
By applying chromium plating 32 to 31e, etc., it becomes possible to smooth the flow of this fluid. Note that this plating step can also be performed separately before joining the first block body 14a and the second block body 14b.

In the above configuration, air introduction port 2
When compressed air is discharged from 0a and 20b toward the chamber 28, this compressed air is throttled by the nozzle part 26, and the air introduced from the vacuum ports 22a and 22b is sucked, and finally the air is discharged from the exhaust port 24a. and is led out from 24b. Therefore, the desired negative pressure can be obtained on the vacuum ports 22a, 22b side.

In this embodiment, the first block body 14
a. The second block body 14b is divided in the direction along the air flow path, and furthermore, inside them, that is, all the flow paths through which this fluid flows,
Specifically, the surface from the air introduction ports 20a, 20b to the nozzle part 26 via a narrow passage, and the surface from the vacuum ports 22a, 22b to the actual 30 via a narrow passage.
, a surface extending from the chamber 30 to the exhaust ports 24a and 24b via a narrow passage, and a bulging portion 25.
Since the surfaces extending from a and 23b to the inclined surfaces 27a and 27b, which expand in diameter, are plated with chrome 32, the fluid flows extremely smoothly. If it is made of precision machined finish such as casting, there is an advantage that if a sealing member is applied, a normal sealing member can be used instead of a special sealing member.

Furthermore, another embodiment of the present invention is shown in FIGS. 3 and 4, and the same reference numerals as in the embodiment in FIG. 1 indicate the same components. Unlike the embodiment described above, the nozzle section and the diffuser section are each configured to have a perfect circular cross section. Of course, even in such a configuration, the same effects as in the second embodiment can be obtained.

In the above two embodiments, the respective blocks 14a and 14b may be mechanically joined using bolts or the like, but they may also be sealed using various strong adhesives currently being developed. Alternatively, the blocks may be connected to each other.

According to the present invention, as described above, the ejector device is composed of block bodies, each of the block bodies is formed so as to be connected along the fluid flow direction, and furthermore, the ejector device has a surface serving as a fluid passage. , that is,
Since the nozzle part, diffuser part, etc. are coated with metal or the like, assembly is easy and airtight. Further, it can be manufactured at a low cost, the degree of vacuum is further improved, and the fluid flow is extremely smooth, so that an efficient ejector device can be obtained. Furthermore, if each block is made of a molded product such as a casting, precision will be further increased, and since it is formed into a rectangular parallelepiped or cube shape, it can be easily incorporated into other equipment. It will be done.

In particular, the narrow passages from the air introduction port to the nozzle section, etc. are treated with chrome plating to create a smooth surface. This has the advantage that fluid can be smoothly introduced or discharged.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments. For example, as part of the surface treatment, other metals or plastics may be used instead of chromium plating. Within the scope of the present invention, it is possible to apply a coating to the surface that serves as a fluid passage, or to configure the port section and the differential user section separately as shown by the broken line in FIG. 3. Of course, various improvements and changes in design are possible.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of an ejector device showing an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line -- in FIG. 1, and FIG. 3 is a longitudinal cross-sectional view showing another embodiment of the ejector device of the present invention. , FIG. 4 is a sectional view taken along the line -- in FIG. 3. 10... Ejector device, 14a... First block body, 14b... Second block body, 20a, 20
b...Air introduction port, 22a, 22b...Vacuum port, 24a, 24b...Exhaust port, 26...
...Nozzle part, 28, 30... Chamber, 32... Chrome plating.

Claims (1)

[Claims] 1. The ejector main body is constructed by separating a first block body and a second block body which are formed symmetrically, the first block body and the second block body are joined along the fluid flow direction, and the The bulges and slopes formed on the first block body and the second block body are made to correspond to each other to constitute a nozzle part and a diffuser part, and the first block body and the second block body are provided with air from the nozzle part, respectively. A fluid introduction port, a vacuum port, and a fluid exhaust port are arranged to extend in a direction perpendicular to the fluid flow direction and face each other, and a fluid passage is surrounded by the first block body and the second block body. An ejector device characterized in that the inner wall surface of the entire chamber to be formed is subjected to surface treatment to have a smooth surface.