JP3892069B2 - Low noise ejector - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an ejector, and more particularly, to a low-noise ejector that does not generate significant noise when a fluid flows down. The ejector ejects a driving fluid such as water to the nozzle portion with a driving force such as a circulation pump, generates a suction force by the velocity energy of the fluid, sucks a fluid such as gas, steam or hot water from the suction portion, This is a mixed fluid that is pumped from the diffuser to a predetermined location, and is used as a pump function.
[0002]
[Prior art]
As a conventional ejector device, for example, the one proposed as Japanese Patent Application No. 7-141214 has been used. This is one in which the ejector is arranged from the top to the bottom in the vertical direction, a partition member is arranged on the outer periphery of the diffuser, and a collision part where the fluid collides is attached below the outlet part of the diffuser. A sufficient suction force can be ensured by the ejector, and the mixed gas-liquid can be separated to prevent a reduction in pump efficiency.
[0003]
[Problems to be solved by the present invention]
The conventional ejector device has a problem that significant noise is generated by the fluid to be sucked. For example, when the fluid to be sucked is high-temperature water, bubbles generated due to the pressure drop at the nozzle portion are destroyed along with the pressure recovery at the diffuser portion, and a significant noise is generated.
[0004]
The noise of the ejector becomes a particular problem depending on the place where the ejector is installed, particularly when it is installed in the vicinity of an operator such as a factory, or when installed near a private house.
[0005]
Therefore, the technical problem of the present invention is to obtain an ejector that does not generate significant noise.
[0006]
[Means for Solving the Problems]
The configuration of the low noise ejector of the present invention is as follows. A nozzle portion, a suction portion 1 which is formed around of the nozzle portion, Ri consists diffuser portion 2 which was continuously provided to the suction unit 1 and the nozzle portion, the coating member 4 at least for covering the outer periphery of the diffuser portion 2 in a closed form Is attached, and the space 20 in the covering member 4 communicates with the suction portion 1 of the ejector, and a check valve 10 is provided at the communicating portion .
[0007]
[Action]
By attaching a covering member to the outer periphery of the diffuser portion and communicating the space in the covering member with the suction portion of the ejector, when an initial fluid flows down to the nozzle portion of the ejector, a suction force is generated, The space is in a reduced pressure state, that is, in a vacuum state. Since the outer periphery of the diffuser is in a vacuum state, noise generated in the diffuser is less likely to be transmitted to the outside, and noise around the ejector can be reduced.
[0008]
【Example】
The illustrated embodiment will be described in detail.
FIG. 1 shows an overall configuration diagram of a low noise ejector. An ejector 11 is formed by the suction part 1 incorporating the nozzle part and the diffuser part 2, and the ejector 11 and the straight tubular connection pipe line 3 are hermetically covered with a cylindrical covering member 4 to form a low noise ejector. To do.
[0009]
A driving fluid conduit 5 for allowing the driving fluid to flow down to the internal nozzle portion is connected to the suction portion 1, and a suction passage 6 is connected to the side to attach the suction conduit 7 and the opening / closing valve 8. The suction passage 6 is branched by a conduit 9 and the space 20 in the covering member 4 and the suction portion 1 of the ejector 11 are communicated with each other via a check valve 10. The check valve 10 allows the fluid to flow only in the direction indicated by the arrow, and does not allow the fluid to pass in the opposite direction. The connecting pipe 3 of the diffuser 2 is connected to a passage 15 and communicates with a pumping location of a mixed fluid such as a tank (not shown).
[0010]
When the covering member 4 is made of a vibration transmitting body such as a metal material, a vibration isolating material such as a synthetic rubber is provided at the contact portion between the covering member 4 and the ejector 11 so that vibration noise of the ejector portion 11 is not transmitted to the outside as much as possible. Attach 12,13,14.
[0011]
Next, the operation will be described.
When the on-off valve 8 is closed and the ejector 11 passes the initial fluid from the drive fluid line 5, a suction force is generated in the suction portion 1, and the air in the space 20 in the covering member 4 is sucked and depressurized. Due to this, a vacuum state is obtained. The air sucked into the suction part 1 is mixed with the initial fluid and reaches the outside of the system from the diffuser 2.
[0012]
Necessarily gastric When suction force is sufficiently large, on-off valve 8 of the ejector 11.
[0013]
When the space 20 in the covering member 4 is in a vacuum state, even if the ejector 11 sucks high-temperature water from the suction passage 6 to generate bubbles, and noise is generated due to the bubbles being destroyed in the diffuser portion 2. The noise vibration transmitted to the outside by the vacuum is reduced, and a low noise ejector can be obtained.
[0014]
【The invention's effect】
The outer periphery of the diffuser can be evacuated by the suction force of the ejector, so that noise generated in the diffuser is less transmitted to the outside and a low noise ejector can be obtained.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional configuration diagram of an embodiment of a low noise ejector of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Suction part 2 Diffuser part 4 Cover member 5 Drive fluid pipe line 6 Suction path 9 Pipe line 10 Check valve 11 Ejector 20 Space

Claims (1)

A nozzle portion, a suction portion 1 which is formed around of the nozzle portion, Ri consists diffuser portion 2 which was continuously provided to the suction unit 1 and the nozzle portion, the coating member 4 at least for covering the outer periphery of the diffuser portion 2 in a closed form A low noise ejector characterized in that a check valve 10 is provided in the communicating portion in which the space 20 in the covering member 4 communicates with the suction portion 1 of the ejector.

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