JPH071036B2 - Check valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a check valve used in a liquid ring type gas pump or the like, and more particularly, to prevent a plate-shaped valve body from reversing, to ensure its operation, and to speed it up. The present invention relates to a check valve suitable for improving the property.

[Prior Art] As a check valve using a plate-shaped valve body, there are technologies disclosed in Japanese Utility Model Laid-Open No. 52-119506 and Japanese Patent Laid-Open No. 55-5428.

In the prior art disclosed in Japanese Utility Model Laid-Open No. 52-119506, a plurality of discharge ports formed in a port plate are provided with a sheet with a cut for each discharge port as a plate-shaped valve body. It is laid outside the plate, and the outer edge of each sheet is fixed to this port plate.

On the other hand, in the prior art disclosed in Japanese Patent Laid-Open No. 55-5428, a plate-shaped valve body having a unit plate-shaped body provided with a plurality of rows of discharge ports on a control plate and extending from the valve body to the discharge ports of each row is disclosed. Laying,
A protective body having a shape capable of forming a constant space is attached to the back of the plate-shaped valve body.

[Problems to be Solved by the Invention] However, in the prior art disclosed in Japanese Utility Model Laid-Open No. 52-119506, each sheet is merely stopped at the outer edge portion. Therefore, a concentrated load is applied to the outer edge,
There is a problem that each seat is excessively warped and permanently deformed, so that it does not function as a check valve. Further, in the specification in which the discharge ports are formed finely and densely, one sheet is attached to each discharge port, and in this conventional technique, there is a problem that it is difficult to secure a seat attachment space, and moreover, the seat attachment work is often performed. There is also a problem that it takes time.

Further, in the prior art disclosed in Japanese Patent Laid-Open No. 55-5428, a protective plate having a special shape is used in addition to the plate-shaped valve body. Therefore, a lot of man-hours are required to manufacture this protective plate, which causes a problem of increasing cost.

By the way, for example, in a specification in which three or more discharge holes are arranged in a row, the pressure applied to each discharge hole may be different. Therefore, even if the discharge holes are in the same row, the plate-shaped valve body must be operated reliably in accordance with the pressure applied to each discharge hole. On the other hand, in the prior art, in each case, the plate is made to correspond to the difference in pressure applied to a large number of discharge holes densely arranged in the same row, and particularly to the pressure applied to the discharge holes at the intermediate position. No consideration is given to ensuring the operation of the valve body.

The object of the present invention is to solve the above-mentioned problems of the prior art, to prevent the plate-shaped valve body from reversing, and even in a specification in which many discharge holes are densely arranged in the same row, the plate-shaped valve body The purpose of the present invention is to provide a check valve that operates reliably and quickly, has excellent durability, and is easy to manufacture and install.

[Means for Solving the Problems] The intake / exhaust control plate is provided with a plurality of rows in a regular order, and at least each row has a discharge hole at a position closer to the center and a discharge hole at an outer position. A plurality of plate-shaped valve bodies are attached in a stacked manner in the fluid discharge direction so as to be able to open and close three discharge holes consisting of both discharge holes.

The laminated plate-shaped valve element includes an inner layer plate-shaped valve element that is in contact with the discharge hole row of the intake / exhaust control plate, an intermediate layer plate-shaped valve element that is laminated on the inner layer plate-shaped valve element, and the intermediate layer plate-shaped element. An outer layer plate-shaped valve body laminated on the valve body, and each root has a fork shape that is commonly attached to the suction / discharge control plate.

Among them, the inner-layer plate-shaped valve body is formed with a flap extending from one end of the root portion along each row to a position that closes the discharge hole near the central portion from the discharge hole at the outer position of each row, Each flap is provided with a hole portion communicating with the discharge hole at the intermediate position and the discharge hole at the inner position. The plate valve body of the intermediate layer is formed with a flap extending at one end of the root portion to a position that closes the hole portion at the outer position and the hole portion at the intermediate position in the outer layer plate valve body along each row, Each flap is provided with a hole communicating with the discharge hole at the inner position through the hole of the outer plate valve body. The plate valve body of the outer layer has a flap formed at one end of the root portion extending along each row to a position where the discharge hole at the outer position of the intermediate layer plate valve body of each row is closed.

Then, the plate-shaped valve bodies of the inner layer, the middle layer, and the outer layer are independently responsive to the pressure of the discharge hole at the position near the center of the suction / discharge control plate, the discharge hole at the intermediate position, and the discharge hole at the outer position. It is configured to open and close.

[Operation] In the present invention, when the pressure inside the discharge hole formed in the intake / exhaust control plate becomes higher than the pressure outside, the excess pressure is discharged from the plate-shaped valve body through each discharge hole. That is, as described above, in the plate-shaped valve body, flaps are formed at one end of the root portion by extending from the discharge holes at the outer position of each row to the position at which the discharge hole near the center is closed along each row. Along with each of the flaps, an inner layer plate-shaped valve body provided with a discharge hole at an intermediate position and a hole communicating with a discharge hole at an inner position, and an outer position on the outer layer plate-shaped valve body along each row at one end of the root part. Flaps are formed extending to the position where the holes at the center and the holes at the intermediate position are closed, and each of the flaps is provided with a hole communicating with the discharge hole at the inner position and the hole of the outer layer plate valve body. The intermediate-layer plate-shaped valve element and the outer-layer plate-shaped element that extends along the rows at one end of the root and extends to the position that closes the discharge hole at the outer position of the intermediate-layer plate-shaped valve element in each row Since it consists of a valve body, it is closed by the flap of the inner layer plate valve body. In the discharge hole near the core, the tip of the flap of the inner layer plate-shaped valve body is pushed open and discharged to the outside, and in the discharge hole at the intermediate position closed by the flap of the intermediate layer plate-shaped valve body, the inner layer plate is Through the hole of the flap of the valve body of the valve body, the tip of the flap of the valve plate of the intermediate layer plate is pushed open and released to the outside, and in the discharge hole at the outer position which is closed by the flap of the valve plate plate of the outer layer, It passes through the holes provided in the inner-layer plate-shaped valve body and the intermediate-layer plate-shaped valve body, and pushes the tip end of the flap of the outer-layer plate-shaped valve body to release it to the outside.

That is, since each plate-shaped valve element is attached to each of the discharge holes so as to be independently openable and closable, the plate-shaped valve element is surely opened to the set opening without interfering with other plate-shaped valve elements. Therefore,
Even in the specification where at least three discharge holes are provided in the same row, each plate valve element including the plate valve element for the discharge hole at the intermediate position operates in response to the pressure of the discharge hole. Can be made.

Further, during the opening operation of the plate-shaped valve body, the inner layer plate-shaped valve body is prevented from being warped by the intermediate layer plate-shaped valve body and the outer layer plate-shaped valve body which are sequentially stacked on the inner-layer plate-shaped valve body, and the intermediate-layer plate-shaped valve body is closed. The body is restrained from excessive warping by an outer layer plate-shaped valve body laminated on the body. As a result, it is possible to prevent permanent deformation of each plate-shaped valve element due to extreme bending strain, and the direction in which each plate-shaped valve element closes when the pressure inside the discharge hole row changes to negative pressure with respect to the pressure outside. Therefore, the plate-shaped valve bodies can be improved in durability.

Moreover, in the present invention, it is not necessary to use a protective plate having a special shape, and the plate-shaped valve bodies of the inner layer, the intermediate layer, and the outer layer may be sequentially laminated, and the roots thereof may be collectively fixed. Installation can be done easily. Furthermore, since the plate-shaped valve bodies of the inner layer, the intermediate layer, and the outer layer are laminated and attached together and have a fork shape, each row has 3
Even if the specification has more than one discharge hole, it does not require much space for mounting the plate-shaped valve body.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the check valve according to the present invention. FIG. 1 is a vertical sectional front view, FIG. 2 is a plan view, and FIG.
It is a vertical cross-sectional front view of the sheet-shaped valve body. FIG. 4 is a vertical side view of a liquid ring gas pump to which the check valve of the present invention is applied, and FIG. 5 is a sectional view taken along line VV of FIG.

The liquid ring gas pump shown in FIGS. 4 and 5 includes a casing 1, a side plate 2 fixed to one side of the casing 1, a main shaft 4 supported by a bearing 3 on the side plate 2, An impeller 5 attached to the main shaft 4, a suction / discharge control plate 7 fixed to the other side of the casing 1, and a suction / discharge control plate 7
Suction port 8, discharge port 9 and a plurality of discharge holes 10 provided in
A check valve 11 attached to the intake / exhaust control plate 7 corresponding to the discharge holes 10 and an intake / exhaust casing 20 fixed to the other side of the casing 1 with the intake / exhaust control plate 7 interposed therebetween. And is configured.

The casing 1 is formed in a cylindrical shape as shown in FIG. A liquid is sealed inside the casing 1.

The main shaft 4 and the impeller 5 are supported in an eccentric position with respect to the casing 1, as shown in FIG. When the impeller 5 is rotated, the liquid circulates to form a liquid ring 6. A crescent-shaped space is formed between the impeller 5 and the liquid ring 6. This space expands as the impeller 5 rotates, and then contracts.

As shown in FIG. 4, the suction / discharge control plate 7 is sandwiched between the casing 1 and the suction / discharge casing 20.

The suction port 8 is formed at a position where a space formed between the impeller 5 and the liquid ring 6 in the suction / discharge control plate 7 expands.

The discharge port 9 is formed at a position where the space in the suction control plate 7 is reduced.

Each of the discharge holes 10 is formed at a position where the space is reduced in the suction / discharge control plate 7 and upstream of the discharge port 9 in a certain order. That is, in this embodiment, the discharge hole 10
As shown in FIGS. 5 and 2, a plurality of rows are arranged on a straight line such that there are two rows closest to the ejection port 9 side and three rows from the next row. Therefore, the most discharge port 9
There are three discharge holes 10 in each of the rows other than the row closer to the center, and there are three discharge holes 10 near the center of the intake / exhaust control plate 7, ones located outside, and ones located in the middle of these. Has become.

The check valve 11 is, as shown in FIG. 1 and FIG. 2 in an enlarged manner, provided with a plate-shaped valve body of an inner layer corresponding to the row of the discharge holes 10.
It is composed of a laminated plate-shaped valve body in which a plate 12, a plate-shaped valve body 13 as an intermediate layer, and a plate-shaped valve body 14 as an outer layer are stacked in the discharge direction. Each of the plate-shaped valve bodies 12, 13, 14 is made of a material having an elastic property, and has a wide base portion 15 having a support portion 16 and a sealing portion 17.
The book flap is formed in a fork shape extending. Sealing part 17 in the flap of each plate-shaped valve body 12, 13, 14
Is curved in a streamlined manner from the end of the support 16 as shown in FIG. Each sealing part 17 of the plate-shaped valve body 12 of the inner layer
Is configured to close the discharge hole 10 located near the center of the suction / discharge control plate 7. Therefore, the flap of the plate-shaped valve body 12 has a discharge hole near the center of the suction / discharge control plate 7 from the root portion 15.
It is formed to extend to the position where 10 is closed. In addition, in the support portion 16 of the flap of the plate-shaped valve body 12, the discharge hole at the intermediate position of the suction / discharge control plate 7 in the row having three discharge holes 10.
The suction / discharge control plate 7 is provided in a row in which a hole portion 18 that communicates with the discharge hole 10 at the outer position is provided and two discharge ports 10 are provided.
Only the hole portion 18 communicating with the discharge port 10 at the outer position is provided.

Each of the sealing portions 17 of the plate valve body 13 of the intermediate layer is different from the hole portion 18 provided in the plate valve body 12 of the inner layer except the hole portion 18 near the center of the intake / discharge control plate 7. The hole 18 is closed. Therefore, the flap of the plate-shaped valve body 13 has two discharge holes 10.
The outermost position of the plate-shaped valve body 12 extends to a position that closes only the hole portion 18 at the outer position of the plate-shaped valve body 12 in the row closest to the discharge port 9 and the row of three discharge holes 10 is located. The hole 18 and the hole 18 at the intermediate position are extended to the positions where they are closed. Further, the support portion 16 in the flap of the plate-shaped valve body 13
Is provided with a hole portion 18 that communicates with the hole portion 18 at the outer position of the plate-shaped valve body 12 in a row having three discharge holes 10.

The sealing portion 17 of the plate-shaped valve body 14 of the outer layer is a hole provided in the plate-shaped valve body 13 of the intermediate layer in a row having three discharge holes 10.
18 is closed, and in the row in which the number of the discharge holes 10 is two, it is extended to the vicinity of the discharge holes 10 at the outer position on the plate-shaped valve body 13. The laminated plate-shaped valve bodies in which the plate-shaped valve bodies 12, 13, 14 are stacked are attached to the reverse discharge control plate 7 by the set bolts 19 commonly inserted in the root portion 15, and each plate-shaped valve body 12 , 13,14 can be opened and closed independently. The plate valve body 12 of the inner layer is pressed by the plate valve body 13 of the intermediate layer so as not to reverse, and the plate valve body 13 of the intermediate layer is pressed by the plate valve body 14 of the outer layer so as not to reverse. Has been.

The suction / discharge casing 20 is provided with a suction / discharge port 21 that communicates with a suction port 8 formed in the suction / discharge control plate 7 and a discharge port (not shown) that communicates with a discharge port 9.

The check valve of the above-described embodiment operates as follows with the operation of the liquid ring gas pump.

When the impeller 5 is rotated via the main shaft 4, the casing 1
The liquid enclosed inside circulates to form a liquid ring 6. Further, a crescent-shaped space is created between the impeller 5 and the liquid ring 6, and the space first expands and then contracts.

Then, while the crescent-shaped space moves, gas is sucked in through the suction ports 21 and 8 at a position where this space expands, and gas is discharged through a discharge port 9 at a position where the space shrinks, and the impeller 5 The gas is continuously sucked and discharged in accordance with the continuous rotation of.

By the way, the gas in the casing 1 (hereinafter referred to as “internal gas”)
When the pressure of () is greater than the pressure outside the discharge port 9, it is necessary to discharge the internal gas to avoid overcompression and reduce the required power.

In this case, in a row in which the discharge control plate 7 has three discharge holes 10, among the discharge holes 10 near the center, the discharge holes 10 at the intermediate position, and the discharge holes 10 at the outer position, By the pressure of the gas, the sealing portion 17 in the flap of the plate valve body 12 in the inner layer is pushed open through the discharge hole 10 near the center, and the discharge hole 10 at the intermediate position and the plate valve body 12 in the inner layer are provided. The sealing portion 17 in the flap of the plate valve body 13 of the intermediate layer is pushed open through the opened hole portion 18, and further the discharge hole 10 at the outer position,
The plate-shaped valve element 13 of the outer layer is passed through the hole 18 provided in the plate-shaped valve element 12 of the inner layer and the hole 18 provided in the plate-shaped valve element 13 of the intermediate layer.
The sealing portion 17 of the flap is pushed open and excess pressure is released to the outside through the check valve 11. Therefore,
Since each plate-shaped valve element 12, 13, 14 is independently pushed according to the discharge hole 10 near the center, the discharge hole 10 at the middle position, and the discharge hole 10 at the outer position, there are three discharge holes in each row. Even if 10 is provided, the plate-shaped valve element reliably operates in response to the pressure applied to each discharge hole 10.

In the row having two discharge holes 10 provided in the suction / discharge control plate 7, the sealing portion 17 of the plate-shaped valve body 12 in the inner layer is pushed open through the discharge hole 10 near the center, and the outside Since the sealing portion 17 of the plate valve body 13 of the intermediate layer is pushed open through the discharge hole 10 at the position and the hole portion 18 of the plate valve body 12 of the inner layer, the inner layer of these two discharge holes 10 is also pushed. The plate-shaped valve bodies 12 and 13 in the intermediate layer operate independently. Further, the plate-shaped valve body 12 of the inner layer is prevented from reversing by the plate-shaped valve body 13 of the intermediate layer, and the plate-shaped valve body 13 of the intermediate layer is prevented from reversing by the plate-shaped valve body 14 of the outer layer. The valve bodies 12, 13, 14 are regulated to have proper opening degrees.

On the other hand, when the pressure of the internal gas becomes a negative pressure with respect to the pressure on the outside of the discharge port 9, the check valve is opened to cause reverse suction, and the gas of this suction is compressed, Since the required power increases, it is necessary to close the check valve promptly.

In this case, the plate-shaped valve bodies 12, 13, 14 are prevented from reversing each other, so that the plate-shaped valve bodies 12, 13 and 14 are quickly closed. In addition, each plate-shaped valve body
12,13,14 are held down so that they don't turn over,
Permanent deformation of the plate-shaped valve body due to extreme bending strain can be prevented, so that the check valve 11 can be operated reliably and durability can be improved.

Next, FIGS. 6 and 7 show another embodiment of the present invention. FIG. 6 is a longitudinal front view and FIG. 7 is a plan view.

In this embodiment, the check valve 23 is attached at a predetermined position of the intake / exhaust control plate 7 in correspondence with the discharge holes provided in three sets in the horizontal direction and three sets in the vertical direction. .

The discharge hole is a set of two small holes 22 in the lateral direction,
It is formed by a set of three small holes 22 and a set of two small holes 22.

The check valve 23 is formed by stacking plate-shaped valve bodies 24, 25, and 26 of an inner layer, an intermediate layer, and an outer layer, which are formed in a substantially Y shape, in the discharge direction.

With regard to other configurations and operations of this embodiment, FIG.
This is similar to that of the embodiment shown in FIG.

The check valve according to the present invention can be applied not only to the liquid ring gas pump shown in the drawings but also to fluid devices in general.

Further, the shape and mounting structure of the plate-like valve body are not limited to those shown in the drawings, and may be any one having a desired function.

[Effects of the Invention] According to the present invention described above, the discharge control plate is formed in a plurality of rows in a regular order, and at least each row has a discharge hole at a position closer to the center and a discharge at an outer position. A plurality of plate-shaped valve bodies are attached in a stack in the fluid discharge direction so that the three discharge holes consisting of the holes and the discharge holes between the two can be opened and closed. Along each row, a flap is formed extending from the discharge hole at the outer position of each row to the position at which the discharge hole near the center is closed, and at each flap, a discharge hole at an intermediate position and an inner position are formed. An inner layer plate-shaped valve body provided with a hole that communicates with the discharge hole, and extends to a position that closes the hole at the outer position and the hole at the intermediate position in the outer layer plate-shaped valve body along each row at one end of the root Flaps are formed, and the discharge holes at the inner position and the outer layer plate are formed in each flap. -Shaped valve body provided with a hole communicating with the hole of the valve body, and the discharge hole at the outer position of the intermediate-layer plate-shaped valve body of each row is closed along one row at one end of the root Consisting of an outer layer plate-shaped valve body with flaps extended to the position where
The plate-shaped valve bodies of the inner layer, the middle layer, and the outer layer independently open and close according to the pressures of the discharge holes near the center of the suction / discharge control plate, the discharge holes at the middle position, and the discharge holes at the outer position. Therefore, in the specification in which three discharge holes are provided in each row, each plate-shaped valve element, including the plate-shaped valve element for the discharge hole at the intermediate position, corresponds to the pressure of the discharge hole. Even if the specification is such that each row has three or more discharge holes, it does not require much mounting space for the plate-shaped valve body.

Further, according to the present invention, since the respective plate-shaped valve bodies are laminated so as not to reverse each other, when the pressure inside the discharge hole is negative with respect to the pressure outside the discharge hole, In addition to the effect that the closing operation can be performed quickly, the plate-shaped valve body can be prevented from being permanently deformed due to extreme bending strain, so that the durability can be improved.

Furthermore, according to the present invention, it is not necessary to use a protective plate having a special shape, and the plate-shaped valve bodies of the inner layer and the intermediate layer having the sealing portion and the hole and the plate-shaped valve body of the outer layer having the sealing portion are used. Since it suffices to sequentially laminate and to fix the root part at once, there is an effect that manufacturing and mounting can be easily performed.

[Brief description of drawings]

1 to 3 show an embodiment of the check valve according to the present invention. FIG. 1 is a vertical sectional front view, FIG. 2 is a plan view, and FIG.
FIG. 4 is a vertical sectional side view of a liquid-sealed gas pump to which the check valve of the present invention is applied. FIG. 5 is a sectional view taken along line VV of FIG. 7 and 8 show another embodiment of the present invention, in which FIG. 6 is a vertical sectional front view and FIG. 7 is a plan view. 7 ... Suction control plate, 10 ... Discharge port, 11 ... Check valve, 12,1
3,14 …… Inner layer, middle layer, outer layer of plate-shaped valve bodies, 15 …… Root of plate-shaped valve bodies, 16 …… Same support section, 17 …… Same sealing section, 18 ……
Same hole, 19 ...... same set bolt, 22 ...... small hole forming discharge hole, 23 ...... check valve, 24, 25, 26 ...... plate valve body of inner layer, middle layer, outer layer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Kobayashi 7-1, 1-1 Higashi Narashino, Narashino City, Chiba Prefecture Hitachi Ltd. Narashino Factory (56) Reference JP-A-55-5428 (JP, A) Showa 52-119506 (JP, U) Showa 51-13684 (JP, Y1)

Claims (1)

[Claims] 1. A discharge control plate is provided in a plurality of rows in a regular order, and at least each row has a discharge hole at a position closer to the center and a discharge hole at an outer position, and discharge between them. A plurality of plate-shaped valve bodies capable of opening and closing three discharge holes consisting of holes are attached by laminating a plurality of plate-shaped valve bodies in the fluid discharge direction, and the laminated plate-shaped valve bodies are arranged in the discharge hole row of the suction / discharge control plate. An inner layer plate-shaped valve body, an intermediate layer plate-shaped valve body laminated on the inner layer plate-shaped valve body, and an outer layer plate-shaped valve body laminated on the intermediate layer plate-shaped valve body,
Each root has a fork shape attached to the intake / exhaust control plate at a time, and the plate-shaped valve body of the inner layer is
Along each row at one end of the root portion, a flap is formed by extending from the discharge holes at the outer position of each row to the position at which the discharge hole near the center is closed, and at each flap, the discharge hole at the intermediate position, the inner side A hole communicating with the discharge hole at the position is provided, and the plate valve of the intermediate layer closes the hole at the outer position and the hole at the intermediate position of the outer plate valve along each row at one end of the root. The flaps are extended to the positions, and each flap is provided with a hole communicating with the discharge hole at the inner position through the hole of the outer layer plate-shaped valve body, and the outer layer plate-shaped valve body has one end of the root portion. Along each row, a flap is formed by extending to the position that closes the discharge hole at the outer position of the intermediate layer plate valve body of each row, and each plate valve body of the inner layer, the middle layer and the outer layer controls the intake and discharge. The pressure of the discharge hole near the center of the plate, the discharge hole at the middle position, and the discharge hole at the outside position A check valve, characterized by Flip independently opened and closed.