JP2004169663A - Separator for liquid seal type vacuum pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a miniaturized and inexpensive separator for a liquid seal type vacuum pump. <P>SOLUTION: A vapor-liquid introducing pipe 32 is inserted into a tank body 31 from the under part of the sealed tank body 31, the vapor-liquid introducing pipe 32 is raised upward, and a vapor-liquid mixing phase discharged from the liquid seal type vacuum pump into the tank body 31 by the vapor-liquid introducing pipe 32. The upper opening hole 34 for releasing the vapor-liquid mixing phase in the upper part of the tank body 31 is opened in the upper part of the vapor-liquid introducing pipe 32. A liquid draining port 35 for discharging liquid L reserved in the tank body 31 to the outside is disposed in the tank body 31 on the downside of the upper opening hole 34 of the introducing pipe 32. An in-liquid opening hole 36 for releasing the vapor-liquid mixing phase in the tank body 31 is opened in an erected part 33 of the vapor-liquid introducing pipe 32 on the downside of the liquid draining port 35. An exhaust port 42 of an exhaust pipe 41 for discharging gas to the outside is faced to the ceiling surface of the tank body 31 and opened upwardly. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid ring vacuum pump separator for separating a gas-liquid mixed phase.
[0002]
[Prior art]
As shown in FIG. 4, the liquid ring vacuum pump VP puts a liquid such as water into a casing 1 and rotates an impeller 2 eccentrically supported in the casing 1 so that the liquid is supplied to the inner wall of the casing 1. To form a reflux 3, forming a crescent-shaped space 4 at the center of the reflux 3. The crescent-shaped space 4 is finely divided by the respective blades 5 of the impeller 2 to form cells, and repeats expansion and contraction by rotation. By providing the intake port 7 at the expansion cycle position of the control plate 6 provided on the side surface of the impeller 2 and providing the exhaust port 8 at the contraction cycle position, the gas sucked from the vacuum target can be continuously output. The air is sucked into the cells of the expansion cycle from the intake port 7 and is exhausted to the exhaust port 8 from the cells of the contraction cycle.
[0003]
Such a liquid ring vacuum pump VP needs a sealing liquid to generate a vacuum, and therefore, a gas-liquid mixed phase in which the exhaust gas and the sealing liquid are mixed is discharged from the exhaust port 8.
[0004]
Therefore, it is necessary to connect a device for separating gas and liquid to the exhaust port 8 (for example, see Patent Document 1).
[0005]
FIG. 5 shows a system for operating the liquid ring vacuum pump VP. The check valve for suction is connected to the suction port 7 of the liquid ring vacuum pump VP driven by the motor 11 by piping connected to a vacuum object. A valve 12 is provided, and a separator 14 as a device for separating gas and liquid is connected to the exhaust port 8 via a pipe 13. The separator 14 has a drain port for discharging the separated liquid. 15 and an exhaust port 16 for discharging gas, a liquid injection pipe 18 is inserted through a liquid injection electromagnetic valve 17 for supplying liquid, and the liquid is supplied to a liquid ring vacuum pump VP. A pipe 19 for circulation is drawn out, and a heat exchanger 21 and a flow meter 22 for cooling the liquid are provided in the pipe 19.
[0006]
As shown in FIGS. 6 and 7, a conventional separator 14 is connected to the pipe 13 for introducing a gas-liquid mixed phase from a liquid ring vacuum pump VP into a lower portion of a cylindrical tank body 23. The inserted inlet pipe 24 is inserted, and as shown in FIG. 7, the tip is curved tangentially, and a downwardly curved drain pipe 25 having the drain port 15 is inserted. Further, an exhaust pipe 26 having the exhaust port 16 is inserted into the center of the upper plate portion of the tank body 23, and a punching metal 27 is welded between a lower portion of the exhaust pipe 26 and the tank body 23. Is filled with a sound absorbing material 28 such as glass wool. A gas-liquid separation space 29 is provided between the inlet pipe 24 and the exhaust pipe 26 to secure a sufficient height for gas-liquid separation.
[0007]
By providing a gas-liquid separation space 29 having a sufficient size for gas-liquid separation, the superficial velocity is reduced, the height of the gas phase is secured, and the sound absorbing material 28 reduces the exhaust noise. Mute.
[0008]
[Patent Document 1]
JP-A-6-147167 (page 1, FIG. 1)
[0009]
[Problems to be solved by the invention]
As described above, conventionally, since the sound absorbing material 28 and the gas-liquid separation space 29 are required, there is a problem that the separator 14 becomes large and expensive.
[0010]
The present invention has been made in view of such a point, and an object of the present invention is to provide a compact and inexpensive liquid ring vacuum pump separator.
[0011]
[Means for Solving the Problems]
According to the first aspect of the present invention, a closed-type tank body and a gas-liquid mixed phase inserted into the tank body from the lower part of the tank body and formed to rise upward and discharged from the liquid ring vacuum pump are formed in the tank body. A gas-liquid introduction pipe, an upper opening hole opened at the top of the gas-liquid introduction pipe to open the gas-liquid mixed phase into the upper part of the tank body, and a tank below the upper opening hole of the gas-liquid introduction pipe. A drain port provided on the body for discharging the liquid stored in the tank body to the outside, and a gas-liquid mixed phase opened in the rising portion of the gas-liquid introduction pipe below the drain port to allow the liquid inside the tank body A liquid-sealed vacuum pump separator comprising: a submerged release hole that opens to, and an exhaust pipe that has an exhaust port opened upward facing the ceiling surface of the tank body and exhausts gas to the outside, The exhaust sound is loud when only the upper open hole in the gas phase is used. Although it is easy to occur, by providing both the upper open hole and the submerged open hole as described above and balancing the relationship between the upper open hole and the submerged open hole, the mist caused by the waving of the liquid surface while suppressing the exhaust noise In addition, by making the exhaust port of the exhaust pipe upward, it is possible to prevent mist moving along with the exhaust flow from flowing directly into the exhaust port. For this reason, the distance between the liquid discharge port and the exhaust port can be reduced by the configuration that suppresses the waving of the liquid surface and the upward configuration of the exhaust port, and a compact separator can be provided. Further, since a sound-absorbing function can be provided by the opening in the liquid, a sound-absorbing material or the like is not required, and an inexpensive and compact separator can be provided.
[0012]
According to a second aspect of the present invention, in the liquid ring vacuum pump separator according to the first aspect, a mist trap that is connected to the exhaust pipe and removes mist in the gas by a stagnant chamber having a larger sectional area than the exhaust pipe, A liquid return pipe for returning the liquid trapped in the mist trap to the inside of the tank, and having a configuration in which an upward opening of the exhaust port and a configuration in which the mist trap is provided, the liquid phase in the gas-liquid mixed phase And the liquid collected in the mist trap is returned to the tank body by the liquid return pipe, whereby the mist can be reliably prevented from flowing out.
[0013]
According to a third aspect of the present invention, in the separator for a liquid ring vacuum pump according to the first or second aspect, the liquid in the tank body is circulated and supplied to the liquid ring vacuum pump provided below the tank body as a sealed liquid. The tank has a circulating tank function to store the sealing liquid of the liquid ring vacuum pump in the tank body, and the pool liquid in the tank body is used as a circulating liquid from the circulation port to the liquid ring vacuum pump. Available.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to an embodiment shown in FIGS.
[0015]
FIG. 1 shows a separator for a liquid ring vacuum pump. Reference numeral 31 denotes a sealed tank body. From the lower part of the tank body 31, a gas-liquid introduction pipe 32 is inserted into the tank body 31 and stands up. The gas-liquid mixed phase discharged from the liquid ring vacuum pump VP is introduced into the tank 31 by the gas-liquid introduction pipe 32.
[0016]
An upper opening 34 is opened above the rising portion 33 of the gas-liquid introduction pipe 32, and the gas-liquid mixed phase is opened into the upper part of the tank 31 through the upper opening 34.
[0017]
A drain port 35 is provided in the tank body 31 below the upper opening hole 34 of the gas-liquid introduction pipe 32, and the liquid L stored in the tank body 31 overflows from the drain port 35 to the outside. Is discharged.
[0018]
Below the drain port 35, a plurality of submerged open holes 36 are opened in the rising portion 33 of the gas-liquid introduction pipe 32, and a gas-liquid mixed phase is formed in the liquid through the submerged open holes 36. It is opened in the tank body 31.
[0019]
An exhaust port 42 on the inner end side of the exhaust pipe 41 is opened upward facing the ceiling surface of the tank body 31, and gas is discharged from the exhaust port 42 to the outside of the tank body 31 through the exhaust pipe 41. Is done.
[0020]
A mist trap 43 is connected to the outer end of the exhaust pipe 41. The mist trap 43 removes a liquid phase such as mist mixed in the gas by a stagnation chamber 44 having a larger sectional area than the exhaust pipe 41. An external exhaust pipe 41 a located above the exhaust pipe 41 is connected to a side surface of the mist trap 43 facing the connection surface of the exhaust pipe 41.
[0021]
A liquid return pipe 45 for returning the liquid captured in the mist trap 43 to the inside of the tank 31 is connected to the bottom of the mist trap 43.
[0022]
In addition, a circulation port 46 for circulating and supplying the liquid L in the tank body 31 to the liquid ring vacuum pump VP as a sealed liquid is provided below the tank body 31.
[0023]
As shown in FIG. 2, the upper part of the gas-liquid introduction pipe 32 is provided in a T-shape, the upper end part 47 is closed, and the upper opening holes 34 are opened on the left and right parts, respectively. Therefore, the gas-liquid mixed phase collides with the upper end portion 47 of the gas-liquid introduction pipe 32, turns right and left, and is discharged from the upper open hole 34, so that the gas-liquid mixed There is an effect that the mixed phase is easily changed to the liquid phase and the liquid phase having inertia is hard to rise.
[0024]
Next, the operation of the embodiment shown in FIGS. 1 and 2 will be described.
[0025]
When the gas-liquid mixed phase discharged from the liquid ring vacuum pump VP enters the gas-liquid introduction pipe 32, when rising in the rising portion 33, a part of the gas-liquid mixed phase enters the tank body 31 through the submerged opening 36. Out of the liquid L, the liquid phase is absorbed in the liquid L, and only the gas phase floats on the liquid surface. At this time, a gentle wave occurs on the liquid surface, and a slight mist is generated.
[0026]
The remaining gas-liquid mixed phase in the gas-liquid introduction pipe 32 further rises and is discharged from the upper open hole 34 into the gas phase in the tank 31. At this time, the gas-liquid mixed phase collides with the upper end portion 47 of the gas-liquid introduction pipe 32, turns right and left, and is discharged from the upper opening hole 34. Since the liquid mixed phase is easily changed to the liquid phase and the liquid phase having inertia is hard to rise, the separation of the liquid phase from the gas phase proceeds.
[0027]
Further, the gas-liquid mixed phase discharged from the upper opening hole 34 is sucked into the exhaust port 42 of the exhaust pipe 41 while moving in the gas phase. At this time, since the exhaust port 42 of the exhaust pipe 41 is configured to face upward, a liquid phase such as mist that moves on the exhaust flow does not directly flow into the exhaust port 42, and the liquid phase Separation progresses.
[0028]
When the gas-liquid mixed phase moves to the mist trap 43 via the exhaust pipe 41, the separation of the liquid phase proceeds from the gas flow decelerated in the stagnant chamber 44. At this time, since the external exhaust pipe 41a located above the exhaust pipe 41 prevents the straight flow of the airflow, the separation of the liquid phase from the gas phase also proceeds here.
[0029]
The liquid in the mist trap 43 is collected in the tank 31 by the liquid return pipe 45. The liquid L in the tank body 31 overflows from the drain port 35 to the outside, the liquid level is maintained at a constant level, and is circulated from the circulation port 46 to the liquid ring vacuum pump VP via the heat exchanger. You.
[0030]
Next, effects of the embodiment shown in FIGS. 1 and 2 will be described.
[0031]
(A) When only the upper opening hole 34 is provided, exhaust noise is loud, but mist is hardly generated. On the other hand, when only the submerged opening 36 is used, the exhaust sound is small, but mist is easily generated because the liquid surface is wavy. In contrast, by providing both a submerged open hole 36 in the liquid and an upper open hole 34 in the gas phase, and by balancing the relationship between the upper open hole 34 and the submerged open hole 36, The generation of mist due to the waving of the liquid surface can be suppressed while suppressing the exhaust sound.
[0032]
(B) By configuring the exhaust port 42 of the exhaust pipe 41 to face upward, it is possible to prevent mist moving along with the exhaust flow from directly flowing into the exhaust port 42.
[0033]
For this reason, the distance between the drain port 35 and the exhaust port 42 can be reduced by the configuration of suppressing the waving of the liquid level in (a) and the upward configuration of the exhaust port 42 in (b), and the separator can be used. Can be downsized.
[0034]
Further, the configuration of the submerged opening 36 shown in FIG. This eliminates the need for a sound absorbing material or the like, and makes it possible to manufacture an inexpensive and compact separator.
[0035]
Further, the configuration of the upward opening of the exhaust port 42 in (b) and the configuration in which (c) the mist trap 43 is provided and the exhaust is exhausted to the outside from the external exhaust pipe 41a located above the exhaust pipe 41 are mixed gas and liquid. The liquid phase in the phase can be reliably captured, and the liquid collected in the mist trap 43 is returned to the inside of the tank body 31 by the liquid return pipe 45, so that the mist can be reliably prevented from flowing out.
[0036]
Further, (d) the tank 31 is provided with a circulating tank function for storing the sealing liquid of the liquid ring vacuum pump VP, and the pool liquid in the tank 31 is circulated from the circulation port 46 to the liquid ring vacuum pump VP. Available.
[0037]
Next, FIG. 3 shows a modified example of the upper open hole 34 of the gas-liquid introduction pipe 32. The upper open hole 34 is opened upward. Since the umbrella-shaped collision plate 49 is provided through 48, the gas-liquid mixed phase discharged from the upper open hole 34 collides with the collision plate 49 and then turns obliquely downward. The gas-liquid mixed phase that has collided with the collision plate 49 is easily changed to a liquid phase, and the liquid phase having inertia is unlikely to rise.
[0038]
The present invention can be used as a separator of a liquid ring vacuum pump using a liquid such as water, oil, or a solvent.
[0039]
【The invention's effect】
According to the first aspect of the present invention, when only the upper open hole in the gas phase is used, the exhaust noise is loud, and when only the open hole in the liquid is used, the liquid surface is rippled, and mist is generated. Although it is easy to do, by providing both the upper open hole and the submerged open hole and balancing the relationship between the upper open hole and the submerged open hole, it is possible to suppress the generation of mist due to the ripple of the liquid surface while suppressing the exhaust sound. Also, by making the exhaust port of the exhaust pipe upward, it is possible to prevent the mist moving on the exhaust flow from flowing directly into the exhaust port. For this reason, the distance between the liquid discharge port and the exhaust port can be reduced by the configuration that suppresses the waving of the liquid surface and the upward configuration of the exhaust port, and a compact separator can be provided. Further, since a sound-absorbing function can be provided by the opening in the liquid, a sound-absorbing material or the like is not required, and an inexpensive and compact separator can be provided.
[0040]
According to the second aspect of the present invention, the configuration of the upward opening of the exhaust port and the configuration provided with the mist trap make it possible to reliably capture the liquid phase in the gas-liquid mixed phase, and to collect the liquid accumulated in the mist trap. The mist can be reliably prevented from flowing out of the tank by returning the mist into the tank body by the liquid return pipe.
[0041]
According to the third aspect of the present invention, the tank body is provided with a circulation tank function for storing the sealing liquid of the liquid ring vacuum pump, and the pool liquid in the tank body is used as a circulating liquid from the circulation port to the liquid ring vacuum pump. it can.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of a separator for a liquid ring vacuum pump according to the present invention.
FIG. 2 is a sectional view showing an example of an upper structure of a gas-liquid introduction pipe used in the separator.
FIG. 3 is a sectional view showing a modification of the upper structure of the gas-liquid introduction pipe used in the separator.
FIG. 4 is a sectional view showing an example of a liquid ring vacuum pump.
FIG. 5 is a circuit diagram showing an operating system of the liquid ring vacuum pump.
FIG. 6 is a vertical sectional view showing an example of a conventional liquid ring vacuum pump separator.
FIG. 7 is a horizontal sectional view of the conventional separator.
[Explanation of symbols]
31 tank body 32 gas-liquid introduction pipe 34 upper open hole 35 drain port 36 submerged open hole 41 exhaust pipe 42 exhaust port 43 mist trap 44 stagnant chamber 45 liquid return pipe 46 circulation port L liquid

Claims (3)

A closed tank,
A gas-liquid introduction pipe which is inserted into the tank body from the lower part of the tank body, rises upward and is formed, and introduces a gas-liquid mixed phase discharged from the liquid ring vacuum pump into the tank body;
An upper opening hole which is opened at an upper part of the gas-liquid introduction pipe and opens a gas-liquid mixed phase into an upper part of the tank body;
A drain port provided in the tank body below the upper opening hole of the gas-liquid introduction pipe to discharge the liquid stored in the tank body to the outside,
A submerged release hole which is opened at the rising portion of the gas-liquid introduction pipe below the drain port and opens the gas-liquid mixed phase into the tank body in the liquid;
A separator for a liquid ring vacuum pump, comprising: an exhaust pipe having an exhaust port opened upward facing the ceiling surface of the tank body and exhausting gas to the outside. A mist trap that is connected to the exhaust pipe and removes mist in the gas by a stagnation chamber having a larger cross-sectional area than the exhaust pipe;
2. The separator for a liquid ring vacuum pump according to claim 1, further comprising a liquid return pipe for returning a liquid trapped in the mist trap into the tank body. 3. The separator for a liquid ring vacuum pump according to claim 1, further comprising a circulation port provided at a lower portion of the tank body for circulating and supplying the liquid in the tank body as a sealing liquid to the liquid ring vacuum pump. .

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