JPS6357632B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a side vent type water ring pump, and more specifically, an elastic and flexible plate-shaped valve body is attached to the discharge hole of the pump, and a protective body is provided behind the valve body. related to things.

Working water is sealed in a circular or oval casing, and an internal impeller is rotated to create a crescent-shaped air chamber that performs suction and compression within the impeller.
So-called water ring pumps, which function as pumps, are widely used industrially for vacuum pumps or compressors.

This water ring pump is divided into side air port type and internal air port type depending on the setting positions of the intake port, discharge hole, and discharge port inside the pump, and the present invention provides an effective check valve structure for the former type. It is something.

For side-vent type water ring pumps, high-vacuum pumps are manufactured that have a check valve structure on the discharge side to prevent overcompression and backflow compression of the gas, and the check valve is spherical. A valve body is used.

The check valve structure using a spherical valve body has a structure in which a ball is placed close to the outlet of the discharge hole for each of the multiple discharge holes drilled in the control plate on the side of the impeller. Proper structural design can have a significant effect on performance, but on the other hand, the pressure loss when the gas passes through is large, resulting in an increase in shaft power, and the rolling of the ball increases wear on the ball and other parts. Furthermore, there are drawbacks such as the fact that adhesive substances tend to adhere to the ball, requiring time-consuming disassembly and cleaning.

On the other hand, in place of the spherical valve body which has such drawbacks, research and trial production of a check valve system using a plate-shaped valve body has recently begun.

This is a structure in which a plate-shaped valve body is arranged for a plurality of discharge holes so that it can come into contact with the discharge holes.
Compared to the former, it was expected to have the following advantages: it is less likely to attract adhesive substances, is less likely to cause malfunctions even if it does, and has lower manufacturing costs. However, when the valve is opened due to being blown by the discharged gas body, the valve body itself vibrates and deteriorates, leading to a decrease in its strength and causing malfunction when the valve is closed. It has been found that adding strength to the valve body has disadvantages such as increased rigidity and increased pressure loss.

In order to solve the above-mentioned conventional drawbacks, the present invention provides a protective body behind the plate-shaped valve body to eliminate the vibration of the valve body when the valve is opened, and allows the gas body and liquid to flow out from the discharge hole with little resistance. This was done for the purpose of increasing the durability of the valve body and increasing the efficiency of the pump.

The gist of the present invention is to cover the outlet side upper surface of a control plate 6 attached to the side of a water ring pump with a large number of discharge holes 5 bored on the compression side, the low compression side having a small rotation angle being fixed. A substantially semi-crescent-shaped elastically flexible plate-shaped valve body 10 having a width sufficient to
It has an opening 18 of a certain height on the inner circumferential side 13 and an opening 19 of a higher height than the above height on the outer circumferential side 14, with a certain space behind the outer circumferential side 1.
4 is formed with an inclination that increases from the discharge hole 5 on the low compression side to the discharge hole 5 on the high compression side with a large rotation angle, and is set at a constant height from an appropriate position at an intermediate rotation angle. In addition, a protector 11 having a continuous rising slope from the inner wall surface of the inner circumferential side 13 to the inner wall surface of the outer circumferential side 14 is positioned, and the low compression side is located at the same position as the plate-shaped valve body 10 is attached. The plate-shaped valve body 10 is fixed by the same means, and the other side is fixed at an outer position where the rotation angle is larger than the high-compression side end of the plate-shaped valve body 10, with the end of the plate-shaped valve body 10 serving as a free end. It is a side vent type water ring pump featuring.

The details of the present invention will be explained below based on the embodiments shown in the drawings, but the present invention is suitable for use in a one-rotation, one-action type, a one-rotation, two-action type, a vacuum pump, a compressor, etc. Since the gist is the same, the explanation will be given as an example of a vacuum pump, which accounts for most of the demand for water ring pumps, and a one-rotation, one-operation-side air port type.

Figures 1 and 2 show the main parts of the side air type water ring pump before installing the check valve structure.
A control plate 6 includes an impeller 3 attached to a rotating shaft 2 inside a cylindrical casing 1, and has an intake port 4, a discharge port 5d, and a plurality of discharge holes 5 bored in the side surface of the impeller 3. A cover 7 is attached to the outside of the control plate 6, and the intake chamber (not shown) is partitioned between the control plate 6 and the cover 7, and has a discharge opening 8a for the pump itself on one side. A discharge chamber 8 is formed therein.

The state in which the intake port 4, the discharge hole 5, and the discharge port 5d are formed in the control plate 6 is as shown in FIG. Along the shaped air chamber 9 (shown by imaginary lines in Figure 2), an intake port 4 is provided on the intake side 9a of the air chamber 9, and a plurality of discharge holes 5..., and discharge ports 5d are provided on the compression side 9b. This is what I did.

In FIG. 2, the discharge hole 5 shown as an example,
The discharge ports 5d are bored at the positions of the control plate 6 corresponding to the compression side 9b having a substantially half-crescent shape, and only the discharge ports 5d at the top position, that is, the position where the so-called rotation angle θ is maximum, are made into elongated tapered holes. , the discharge holes 5, that is, 5a, 5b, 5c located below are formed in pairs in the direction along the blades in relation to the cross-sectional shape of the blades of the impeller 3, and are spaced at appropriate intervals. The shape and arrangement of the discharge holes 5 are the same as those described above. Not limited to only
The round holes may be provided as square holes, or the two-row arrangement may be provided as a single-row arrangement, etc. Furthermore, instead of perpendicularly drilling the discharge holes 5 and the discharge ports 5d in the control plate 6, they are also diagonally drilled with a slight inclination toward the outer periphery, so that the gas body can smoothly flow through the discharge holes 5 and the discharge ports 5d. It can also be designed to flow out from the source.

As described above, through the intake port 4, discharge hole 5, and discharge port 5d drilled in the control board 6, the gas from outside the pump is transferred from the intake chamber (not shown) in the cover 7 to the intake port 4.
It enters the air chamber 9 in the impeller 3 through the discharge hole 5,
It reaches the discharge chamber 8 through the discharge port 5d, and the discharge opening 8
A conductive path is formed that flows out of the pump from a.

3 to 6 show the mounting state of the plate-shaped valve body 10 and the protector 11 applied to the discharge hole 5,
The plate-shaped valve body 10 is made of an elastically flexible material such as tetrafluoroethylene resin, rubber, or metal.
It is designed to have a sufficient width to cover a large number of discharge holes 5. Further, the protector 11 is attached to the back of the plate-shaped valve body 10 using a plate at an appropriate interval, and when the valve is opened, the plate-shaped valve body 10 is brought into contact with the inner surface of the plate-shaped valve body 10, so that the valve body 10 is The first function is to prevent the body from vibrating when blown onto the body, and the second function is to appropriately curve and incline the shape of the protective body 11 to prevent the discharged gas body from vibrating, especially liquids that generate high pressure loss. The discharged gas body containing water is allowed to smoothly flow out into the discharge chamber 8, and furthermore, it is directed so as to smoothly face the discharge opening 8a of the pump, thereby reducing pressure loss.

More specifically, a plate-shaped valve body 10 having a substantially half-crescent shape is used, and one side thereof is connected to the uppermost discharge port 5.
The entire remaining discharge hole 5 is connected to the discharge hole 5, leaving only the discharge hole d.
It is attached to the control plate 6 together with the protector 11 with bolts 12, so as to cover it from the gas outlet side. An example of the mounting position of the bolts 12 when the plate-shaped valve body 10 is approximately half-crescent-shaped as described above is the position shown in the figure, that is, near the lower part of the discharge hole 5a in the lower part where the rotation angle θ is the minimum. The upper part of the protector 11 is connected to the valve body 10 by a bolt 12a.
It is attached to the control board 6 apart from the main body.

The shape of the protector 11 is shown as a plate, and its size is large enough to sufficiently cover the plate-shaped valve element 10 located below, so that the plate-shaped valve element 10 blows into the gas body when the valve is opened. The entire protective body 11 is prevented from protruding even if it is bent, bent or twisted. In addition, the plate-shaped valve body 10 is brought into sufficient contact with the
In addition, in order to allow the gas to flow smoothly into the discharge chamber 8 and furthermore to smoothly direct it to the discharge opening 8a of the pump, a certain height H is provided on the inner circumferential side 13 of the protector 11, as shown in FIGS. ₁ opening 18, and an opening ₁ having a height _H2 higher than the height H1 on the outer peripheral side 14.
9, and the inner surface height H ₂ of the outer peripheral side 14 ranges from the discharge hole 5a with the small rotation angle θ to the discharge hole 5c with the large rotation angle θ.
As the angle increases, the height increases to form an inclination T ₂ , and it reaches a constant height from a certain rotation angle θ (see the imaginary diagram in Figure 6, this is a position A where the rotation angle is even larger than the position A-A in Figure 3). '-A') and from the inner opening 18 to the outer opening 19.
The slope T ₁ is formed by applying the slope T1.

The reason why the protector 11 is shaped as described above is to ensure that the valve body 10 comes into contact with the valve sufficiently effectively when the valve is opened.
This is also because the shape is optimal for allowing the gas to flow out smoothly. Furthermore, in the protector 11 having the shape shown in FIG. 4, it is also effective that the slope _T2 is not made halfway, but is sloped continuously from the lower discharge hole 5a to the upper discharge hole 5c.

Next, in order to simplify the installation, the plate-shaped valve body 10 is attached together with the protector 11 using bolts 12 in the previous model, but the valve body 10 and the protector 11 are attached separately. , may be done separately, and they may be attached to the cover 7 instead of the control plate 6. In particular, when the protector 11 is attached to the cover 7 rather than to the control board 6, the protector 11 and the cover 7 are manufactured as one piece from the beginning instead of attaching the protector 11 to the cover 7 with mounting bolts. For example, in the case of a single-blade type small-sized aircraft, there is only one cover 7, so manufacturing it as an integrated unit has the advantage that it is cheaper in terms of manufacturing cost.

FIG. 7 shows another embodiment of the present invention, in which a cover 7 of a water ring pump is provided with an inspection window 16, and a plate-shaped valve body 10 and a protector 11 are individually attached to a control plate 6. The lower part of the body 10 is bent and extended to the cover 7 position near the casing 1 side, that is, near the outer circumference, and an inspection window 16 is provided at the cover 7 position corresponding to the lower part of the valve body 10.

Regarding the installation position of the inspection window 16, it is difficult to install the inspection window 16 closer to the center of rotation because of the shaft seal and bearing part, and it is easier to install the inspection window 16 closer to the outer periphery of the cover 7.
6 flange cover and valve body 10 from inspection window 16
This makes it easier to remove and install. If the inspection window 16a is further provided on the outermost side wall of the cover 7 as shown by the imaginary line, manufacturing and processing will be a little more complicated than in the case of the inspection window 16, but the handling will be simpler. In particular, in order to take out the protector 11 from the inspection window 16a, the protector 11 is
There is no need to twist and remove the inspection window 1.
It's easier to do than in case 6. At this time, the valve body 10
Since it is elastic and flexible, it can be bent appropriately when taking it out, and the inspection window 1
If only the valve body 10 is to be taken out using the inspection windows 16 and 16a, the size of the inspection windows 16 and 16a may be quite small.

Although FIG. 7 shows only the valve body 10 extending toward the inspection window 16, the protector 11 is also extended together with the valve body 10, and the extending ends of both are the same. Instead of attaching it to the control plate 6 with bolts, or extending the lower part of both the protector 11 and the plate-shaped valve body 10 toward the inspection window 16,
It is also possible to leave the installation state as shown in FIG. 3 and to provide only the inspection window 16 near the outer periphery of the cover 7 or on the side wall of the outer periphery.

The configuration of the water ring pump of the present invention is as described above, and as described above, this pump is used as a vacuum pump or a compressor, but it is mostly used as a vacuum pump. The operation of the water ring pump of the present invention will also be described as a vacuum pump. Note that even when used as a compressor, the operating condition of the pump itself does not change at all, only the pressure conditions of the gas body, that is, the suction and discharge pressures, change.

The water ring pump of the present invention is operated by first filling the casing 1 with working water and using a driving device (not shown).
If the impeller 3 is rotated together with the rotating shaft 2, a crescent-shaped air chamber 9 having an intake side 9a and a compression side 9b is formed near the center of the impeller 3.
The gas enters the intake side 9a in the air chamber 9 from the intake chamber (not shown) in the cover 7 through the intake port 4, is compressed by a certain amount and reaches the compression side 9b, and then passes through the discharge holes 5...discharge port 5d. It is discharged through the discharge chamber 8 and flows out of the pump.

When used as a vacuum pump, the initial suction pressure is usually atmospheric pressure, and as the gas at atmospheric pressure flows into the intake port 4, the compression side 9b of the air chamber 9 has a pressure higher than atmospheric pressure. The pressure increases, and therefore the discharge holes 5 become fully open. Therefore, most of the discharged gas body is discharged from the discharge hole 5 at the lower position.
It is discharged from a, etc., and excessive compression is not performed.
At this time, the valve body 10 is blown by the discharged gas body and comes into contact with the protection body 11, as shown in FIG _.
Due to T ₂ , it flows smoothly toward the outer periphery as shown by arrows E and F.

Next, when the intake pressure becomes lower than atmospheric pressure and the degree of vacuum starts to rise, the pressure in the discharge chamber 8 on the outflow side of the discharge hole 5 is atmospheric pressure, while the air chamber 9 on the inside of the discharge hole 5 is compressed. On side 9b, the lower the rotation angle θ is, the lower the pressure is, and sufficient compression is not performed.
The lower the suction pressure at the intake port 4, the lower the compression side 9.
The lower part of b is also at a low pressure, lower than atmospheric pressure, and the plate-shaped valve body 10 is pressed against the control plate 6 due to the pressure difference, and the discharge hole 5a in the lower part is closed.

Thereafter, as the intake pressure further decreases and the degree of vacuum increases, the valve body 10 opens the discharge hole 5 from below, that is, as the degree of vacuum increases.
A, 5b, and 5c are closed in this order, and when the expected operating vacuum degree is reached at a fairly high vacuum, the valve body 10 closes all the discharge holes 5 except for the valveless discharge port 5d at the top. Alternatively, only the upper discharge hole 5 near the uppermost discharge port 5d is closed, and the lower discharge holes 5 are closed.

In this way, the plate-shaped valve body 10 functions to open only the necessary discharge holes 5 and close the rest, so that not only overcompression but also reverse compression of the gas body occurs, that is, the discharged gas in the discharge chamber 8 is moved to the lower part where the pressure is lower. It is possible to prevent the gas from flowing back into the impeller 3 from the discharge hole 5 and compressing the gas inside the impeller 3. Further, since the valve body 10 in the open state contacts the protector 11 and does not vibrate, deterioration of the valve body 10 due to vibration can be prevented.

By providing the inspection windows 16, 16a on the pump of the present invention, the valve body 10 and the protector 11 can be easily inspected, cleaned, and replaced without disassembling the pump. A location that is easy to inspect, that is, near the outer periphery of the cover 7.
Alternatively, since it is provided on the outer periphery of the cover 7 and the minimum necessary size is sufficient to take out the protector 11 and the valve body 10, its manufacture is simple. In particular, by extending the lower part of the valve element 10 or the lower part of the valve element 10 and the protector 11 to the vicinity of the inspection windows 16, 16a, inspection, cleaning, etc. are extremely facilitated.

As described above, the protective body 1 is placed behind the plate-shaped valve body 10.
1, it is possible to prevent the plate-shaped valve body 10 from vibrating, increase the durability of the plate-shaped valve body 10, and make the inner wall surface of the protector 11 slope upward toward the discharge opening 8a. Shape, i.e. control board 6
Since the space created by the inner wall surface of the protector 11 is formed in a shape that expands in the direction of the discharge opening 8a, the discharged gas body containing liquid can be efficiently guided to the discharge opening 8a while suppressing pressure loss as much as possible. By suppressing the pressure increase in the discharge chamber 8 due to the discharged gas body, the efficiency of the side-port type water ring pump itself can be increased, and furthermore, it is possible to reduce the number of operation stoppages due to deterioration and replacement of the plate-shaped valve body 10. Furthermore, the present invention can be applied not only to newly manufactured products, but also to existing side-vent type water ring pumps by simply modifying the control board thereof.The provision of this invention will be extremely useful to those skilled in the art. Become something.

[Brief explanation of the drawing]

Figure 1 is a partial cross-sectional view showing the main parts of the side air port type water ring pump before the check valve structure is installed, Figure 2 is a side view of the same pump with the cover removed, Figure 3
The figure is an explanatory plan view of the attached state of the plate-shaped valve body and the protector, Figure 4 is the left side view of Figure 3, Figure 5 is the right side view of Figure 3, and Figure 6 is the A-- A end view and FIG. 7 are explanatory diagrams of another embodiment in which an inspection window is provided, showing a cover partially cut away. DESCRIPTION OF SYMBOLS 1... Casing, 2... Rotating shaft, 3... Impeller, 4... Inlet port, 5... Discharge hole, 6... Control board, 7... Cover, 9... Air chamber, 10... Board Valve body, 11... protection body, 16... inspection window.

Claims (1)

[Claims] 1 The control plate 6 attached to the side of the water ring pump has a large number of discharge holes 5 drilled on the compression side, and on the upper surface of the outlet side, there is enough water to cover the discharge holes 5 fixed on the low compression side with a small rotation angle. A plate-shaped valve body 10 having elasticity and flexibility is positioned in a roughly half-crescent shape with a wide area, and a certain space is placed behind the plate-shaped valve body 10, and a constant space is provided on the inner circumferential side 13. Height opening 18
and has an opening 19 on the outer circumferential side 14 with a height higher than the above height, and the inner height of the outer circumferential side 14 is from the discharge hole 5 on the low compression side to the discharge hole 5 on the high compression side with a large rotation angle. It forms an inclination that becomes higher as the rotation angle increases, and is set at a constant height from an appropriate position at an intermediate rotation angle, and further forms a continuous rising inclination from the inner wall surface of the inner circumferential side 13 to the inner wall surface of the outer circumferential side 14. The protective body 11 is positioned, and the low compression side is fixed at the same position and by the same means as the plate-shaped valve body 10,
The side air is characterized in that the other side of the plate-shaped valve body 10 is fixed at an outer position where the rotation angle is larger than the high-compression side end of the plate-shaped valve body 10, with the end of the plate-shaped valve body 10 serving as a free end. Mouth type water ring pump.