JPH0316519B2 - - 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 by combining these blocks, a nozzle part and a diffuser part can be formed in multiple stages and integrally. The present invention relates to an ejector device configured to.

2. Description of the Related Art Ejectors have been conventionally used as devices for ejecting steam, air, or water from a nozzle to suck air and 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.

An example of a prior art ejector device of this type is shown in FIG. In this embodiment, the nozzle 2 and the
The differential user part 4 of the second stage is assembled into the first ejector main body 6, and the differential users 8, 10, 12 of the second stage, third stage, and fourth stage are assembled into the second ejector main body 14 and the third ejector main body. 16 and the fourth ejector main body 18, and these ejector main bodies 6, 14, 16, and 18 are screwed together to form an integrated structure.

Therefore, such a configuration is complicated to assemble, and since the threaded portion is deviated by 90 degrees in the fluid flow direction, fluid leakage is likely to occur.On the other hand, in order to avoid this, sealing is required on the assembly surface. It is also extremely difficult to apply Furthermore, there is also the disadvantage that the overall device requires a large number of parts.

Therefore, the inventors of the present invention, as a result of intensive studies and efforts, constructed the ejector separately into a first block body and a second block body, and combined these into the first block body and second block body. If the shape of the nozzle part and the diffuser part is selected so as to be formed in multiple stages, and the first block body and the second block body are divided along the fluid flow direction, excellent airtightness can be achieved. It has been found that an ejector device which is easy to assemble and can be manufactured at low cost due to the reduced number of parts is obtained, and the various disadvantages mentioned above are further alleviated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an ejector device that has a simple structure, is easy to assemble, has excellent airtightness, is suitable for mass production, and is inexpensive to produce.

In order to achieve the above object, the present invention is configured such that the ejector body is formed separately from two block bodies, and the first block body and the second block body are divided along the fluid flow direction. However, the inner wall of one of the block bodies is made flat, and the inner wall of the other block body is formed with a bulge to form a multi-stage nozzle portion that also serves as a diffuser portion between the other block body and the opposite block body. The present invention is characterized in that an introduction port, a plurality of vacuum ports, and a fluid exhaust port are provided, and a check valve is connected to at least the second and subsequent stages of the plurality of vacuum ports.

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

In FIG. 2, reference numeral 20 indicates an ejector device, and this ejector device 20 is basically composed of a first block body 22 and a second block body 24. As can be easily understood from the figure, the first block body 22 has a substantially flat plate shape.

On the other hand, an air introduction port 26 is formed at one end of the second block body 24, vacuum ports 28, 30, and 32 are formed in parallel approximately at the center thereof, and an exhaust port 34 is formed at the other end. is formed. As can be seen from the figure, the upper part of the second block body 24 has a bulging main body portion to form a nozzle portion 36.
a is defined between the nozzle portion 36a and the smooth bottom surface of the first block body 22, and a chamber 38 is defined around this nozzle portion 36a. In this case, the vacuum port 2
Passages 40, 42 and 44 are defined between 8, 30, 32 and chamber 38 to communicate them with each other. Passages 40, 42, and 44 are each selected to increase in diameter as they are directed downstream. As can be easily understood from the figure, the chamber 38 is configured to gradually expand in its cross section via a linear inclined surface extending from the nozzle portion 36a, thereby gradually expanding the diff user. Multistage nozzle portions 36b, 36c, and 36d that also serve as the nozzle portions are formed. In addition, in the figure, reference number 4
Reference numerals 6 and 48 designate check valves interposed in a conduit 50 communicating with the vacuum port 28.

Therefore, in the above configuration, if compressed air is supplied from the air introduction port 28 and air is released from the vacuum port 26 toward the chamber 38 side,
The air introduced from the air introduction port 26 by the compressed air is throttled by the nozzle portion 36a and then discharged into the chamber 38 as a jet stream. As a result, air supplied from vacuum port 28 is rapidly drawn through passageway 40. Next, the air that has reached the nozzle portion 36b has a weakened degree of compression due to its expanding cross-sectional area, but the air from the vacuum port 30 is sucked, and the air from the vacuum port 32 is also sucked in the same way. In this way, air is ultimately led to the outside through exhaust ports 18 and 24. Therefore, the desired negative pressure can be obtained on the vacuum port side.

In this embodiment, as described above, the ejector device 20 is formed of a flat plate-shaped first block body 22 and a second block body 24. That is, the first
The block body 22 can be formed very easily, and
The shape of the second block body 24 can also be easily obtained by a molded product such as a casting or a die-cast product. Therefore, it is possible to secure an ejector device that is easy to assemble, can reduce production costs, is suitable for mass production, and can easily obtain the desired negative pressure.

Furthermore, according to this ejector device 20,
Since the first block body 22 and the second block body 24 are configured to be separated along the fluid flow direction, it is extremely easy to apply sealing to each joint, and the airtightness is also sufficient. It has the advantage of being able to be secured.

FIG. 3 and FIG. 4 show another embodiment of the ejector device according to the present invention.

In this case, the same reference numerals as in the previous embodiment indicate the same components.

In this embodiment, unlike the previous embodiment, the plurality of nozzle portions that also serve as differential users are configured so that their heights are lowered in a stepped manner rather than in a straight line. The structure is slanted so that the fluid is more easily sucked in with respect to the compressed air from the pipe. Therefore, it is easy to obtain the desired degree of vacuum, and also in this case, the main body portion and the ejector nozzle can be integrally molded.
Moreover, it has the advantage of being easy to incorporate.

FIG. 5 further shows an embodiment of the present invention, and in this embodiment, the same reference numerals as in the previous embodiment indicate the same components.

This embodiment is substantially the same as the embodiments shown in FIGS. 3 and 4, but the nozzle parts 36a to 36d, which also serve as diff user parts, are connected to partition walls 52a, 52b,
52c and 52d.

This configuration further simplifies the molding process, and as for the first-stage nozzle 36a, which requires exact dimensions, a separately molded rectangular nozzle 54 is formed on the partition wall 52a as shown in the figure. It may fit into the groove provided. Of course, other partition walls 52b
Similarly, rectangular nozzles can be fitted to the nozzles 52d to 52d.

Next, FIG. 6 shows yet another embodiment of the present invention. In this case as well, the same reference numerals as in the above embodiment indicate the same components.

Therefore, as can be easily understood from Figure 6,
In this embodiment, the second block bodies 24 of the second embodiment are constructed so as to overlap each other. That is, the blocks 24a and 2
4b are formed symmetrically, thus air introduction ports 26a, 26b, vacuum ports 28a, 28b,
30a, 30b, 32a, 32b and exhaust ports 34a, 34b are also symmetrically arranged. Therefore, a nozzle portion 62 is formed by the internal bulges 60a, 60b of the respective block bodies 24a, 24b, and step portions 62a, 62b, 64a, 6
4b, 66a, 66b, 68a, and 68b form a nozzle portion and a chamber 70 that also serves as a diffuser.

In addition, the block bodies 24a and 24b may be attached as necessary.
Of course, a sealing member can be provided between the two.

Also in this embodiment, the block bodies 24a, 24
Since b is divided in the direction along the air flow path, the fluid flows extremely smoothly, and if the block bodies 24a and 24b are made of precision machined finish such as casting, the sealing member can be easily installed. This sealing member has the advantage that a normal sealing member is sufficient.

According to the present invention, as described above, the ejector device is constituted by block bodies, and each block body is formed so as to be connected along the fluid flow direction, and the nozzle portion which also serves as a diffuser is formed in multiple stages. Therefore, it is possible to obtain an ejector that is easy to assemble, has excellent airtightness, can be manufactured at a low cost, and has a further improved degree of vacuum. Furthermore, if each block body is molded with a molded product such as a casting, it is suitable for mass production, and the production cost can be reduced.

Although the present invention has been described above with reference to a preferred embodiment, the present invention is not limited to this embodiment. For example, the differential user section and the port section may be separated as shown by broken lines in FIG. It goes without saying that various improvements and changes in design are possible without departing from the gist of the present invention, such as being able to be configured as follows.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of an ejector device according to the prior art, FIG. 2 is a vertical cross-sectional view of an ejector device showing an embodiment of the present invention, and FIG. 3 is a vertical cross-sectional view of an ejector device according to another embodiment of the present invention. FIG. 4 is a longitudinal sectional view, FIG. 4 is a - line sectional view of the ejector device shown in FIG. 3, FIG. 5 is a perspective view showing another embodiment of the present invention, and FIG. 6 is another embodiment of the present invention. FIG. 2...Nozzle, 4...Diff user section, 6...
Ejector device, 8, 10, 12... differential user section, 14, 16, 18... ejector body, 20...
...Ejector device, 22...First block body, 24
...Second block body, 26...Air introduction port,
28, 30, 32... Vacuum port, 34... Exhaust port, 36a to 36d... Nozzle part, 38...
Room, 40, 42, 44... Passage, 46, 48...
Check valve, 50... Pipe line, 52a to 52d...
Partition wall, 54... Nozzle part, 60a, 60b... Internal bulging part, 62... Nozzle part, 62a, 62b...
...Stepped portion, 64a, 64b...Stepped portion, 66a, 66
b...Stepped portion, 68a, 68b...Stepped portion, 70...
Room.

Claims (1)

[Scope of Claims] 1. The ejector body is formed separately from two block bodies, and the first block body and the second block body are configured to be divided along the fluid flow direction, and either one The inner wall of one block body is made flat, and the inner wall of the other block body is formed in a bulging manner to form a multi-stage nozzle portion which also serves as a diffuser portion between the opposing block body and a fluid introduction port and a plurality of nozzle portions. An ejector device comprising a vacuum port and a fluid exhaust port, and further comprising a check valve connected to at least the second and subsequent stages of the plurality of vacuum ports. 2. The ejector device according to claim 1, wherein the passage from the vacuum port to the nozzle section is inclined in accordance with the flow direction of the compressed fluid.