JPH09178010A - Check valve for water jet room - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability of a check valve to be used for a pump, which is interposed between a constant water-level tank and a lateral installation nozzle in a water jet room, and to lower the generation of abrasion and pressure loss. SOLUTION: A valve is formed of a combination of a valve stopper 2, a valve element 3 and a valve seat 4. The valve stopper 2 is formed with a water leading hole 21 passing through a housing, which is formed of the valve stopper 2 itself and the valve seat 4, and the valve element 3 is provided with a valve element body 32 crossing the stroke direction, and the valve seat 4 is provided with a valve seat surface 42, which is arranged opposite to the valve element surface 32 for surface contact, and a water supplying hole 41, which is opened in the valve seat surface 42 and passed through it for extension. At the non- contact time of the valve element surface 32 and the valve seat surface 42, the water supplying hole 41 is communicated with the water leading hole 21 through an interposed communication passage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for a water jet loom, and more particularly, it is used in a water jet loom in a pressure water supply path for weft insertion from a constant water tank to a weft insertion nozzle. The present invention relates to improvement of the check valve.

[0002]

2. Description of the Related Art Conventionally, as a check valve as described above, a combination of a spherical valve body and a valve seat having a conical valve seat surface is generally used. However, in such a configuration, since the contact between the valve body and the valve seat is a line contact, it is unavoidable that the stress concentrated on the contact portion at the time of water stop becomes excessive. As a result, the contact area is heavily worn.

As the wear progresses in this way, the stroke of the valve element increases, and as a result, the responsiveness of the valve deteriorates. Therefore, when such a structure is applied to the pump for supplying the pressure water of the loom, it becomes impossible to properly follow the speed increase of the loom. Further, water leakage at the worn portion causes the weft injection force of the weft insertion nozzle to decrease, leading to weft insertion failure.

In order to avoid the drawbacks common to the prior arts as described above, the invention of JP-A-6-313239 discloses:
It has been proposed to bring the valve body and valve seat into surface contact. That is, a valve is formed by combining a valve body having a conical contact surface and a conical valve seat. According to this structure, since the contact is a conical surface, the above-mentioned wear due to stress concentration is reduced. Further, by making the conical surface contact in this way, the cross-sectional area through which the pressure water passes can be widened, so that the pressure loss can also be reduced.

[0005]

Generally, pump valves are required to be machined with extremely high accuracy. For example, the gap between the valve stopper and the valve body is 1 mm or less, and processing of the valve stopper and the valve seat requires an accuracy of 1/100 mm unit. However, in the case of the conventional technique proposed above, it is necessary to process the conical surface on the valve body or the valve seat, but in this case, it is very difficult in practice to process with high accuracy. If the processing accuracy at the time of manufacturing is low, the desired proper surface contact cannot be obtained, resulting in a state close to line contact and wear progressing. A hard material may be used in order to improve wear resistance, but the use of a hard material makes the processing itself difficult.

Further, in the case of the configuration proposed above, the stroke length of the valve body does not become the width of the intermediary communication path between the valve body and the valve seat itself, and the stroke length cos (conical inclination angle) is It is the width of the intermediary communication path. That is, the increase in the stroke length does not directly and effectively reflect the intermediary communication path width. Therefore, even if the stroke length is increased, some pressure loss due to the passage of the pressure communication passage cannot be avoided.

In view of the above-mentioned conventional state of the art, an object of the present invention relates to a check valve used in a weft inserting pressure water supply path from a constant water tank to a weft inserting nozzle in a water jet room. Then, the workability is improved, and the wear is reduced and the pressure loss is also reduced.

[0008]

Therefore, in the present invention, therefore, a valve is constructed by a combination of a valve stopper, a valve body and a valve seat, and the valve stopper is opened in a housing composed of itself and the valve seat. And a water guiding hole extending therethrough is provided, and a valve body surface orthogonal to the stroke direction is provided on the valve body,
The valve seat is provided with a valve seat surface facing the valve body surface and capable of face-to-face contact, and a water supply hole that extends through the valve seat surface and penetrates the valve seat surface when the valve body surface and the valve seat surface are not in contact. The gist is that it is configured so as to be in communication with the above water guiding hole via the intermediary communication path.

[0009]

[Function] When pressure water flows into the check valve from the water supply hole side and the valve body surface and the valve seat surface are in a non-contact state, a cylindrical gap is formed between both surfaces, and the water supply hole and the water guide hole are separated from each other. The pressure water flowing from the water supply hole flows out from the water guiding hole through the communication path including the cylindrical gap. Also, when pressure water flows into the check valve from the water guide hole and the valve body surface and the valve seat surface come into contact with each other, a cylindrical gap is not formed between both surfaces and the water supply hole and the water guide hole do not communicate with each other. Then, the pressure water is prevented from flowing out of the water supply hole.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an application of the present invention to a pump for supplying pressure water as an example of application of the present invention. The weft insertion nozzle side of the pump 1 (hereinafter, this direction is referred to as "downstream side"). The check valve 11 supported by the valve holding body 12 is also referred to as a check valve 11 supported by the valve holding body 12 on the constant water level tank side (hereinafter, this direction is also referred to as “upstream side”).
Are provided respectively. The present invention can be applied to any one of the check valves 11.

FIGS. 2 and 3 show a first embodiment of the check valve according to the present invention, in which a valve body surface and a valve seat surface are brought into contact with one shaft hole formed in the valve body. A communication path is formed by the cylindrical gap formed therebetween.

That is, as shown in FIG. 2, the check valve comprises a valve stopper 2, a valve body 3 and a valve seat 4.
These are appropriately combined in the order described from the downstream side to the upstream side.

As shown in FIGS. 2 and 3, a cylindrical space is formed on the upstream side of the valve stopper 2, and the vertical space of the valve body 3 is restricted by the cylindrical space and the valve seat surface 42. A housing for guiding sliding contact is formed. Further, in the valve stopper 2, one water guide hole 21 diverging toward the upstream side is formed so as to open in the cylindrical space and extend through the axial center portion. Also, the valve body 3 has 1
A single shaft hole 31 is formed so as to extend through the shaft center portion. Further, six water supply holes 41 are formed in the valve seat 4 so as to extend therethrough so as to surround the axial center portion in a concentric equiangular arrangement. However, the number of water supply holes 41 is not limited to six,
It is possible to appropriately form a plurality. Further, in order to make the pressure distribution uniform, it is preferable that the water supply holes 41 are concentrically equiangularly arranged, but the present invention is not limited to this. Further, on the side of the valve body facing the valve seat, a valve body surface 32 orthogonal to the stroke direction is provided.
Is provided. To face this, the valve seat 4 has a valve seat surface 4
2 is formed so that the valve body surface 32 can be contacted.

When the valve body surface 32 and the valve seat surface 42 are not in contact with each other, a cylindrical gap is formed between the two surfaces, and the cylindrical gap and the shaft hole 31 of the valve body 3 form a communication path. That is, the shaft hole 31 of the valve body 3 and the water supply hole 41 of the valve seat 4 are both open at their ends. Therefore, the water supply hole 41 and the water guide hole 21
And are in communication with each other via this communication path, and pressure water flows from the former to the latter.

When the valve body surface 32 and the valve seat surface 42 are in contact with each other, no columnar gap is formed between the two surfaces and no connecting path is formed. That is, the shaft hole 31 of the valve body 3 and the valve seat 4
Both ends of the water supply hole 41 are closed. Therefore, the water supply hole 41 and the water guide hole 21 are in a non-communication state, and pressure water does not flow from the former to the latter.

FIG. 4 and FIG. 5 show a second embodiment of the check valve according to the present invention, in which a valve body surface and a valve seat surface are brought into contact with a plurality of shaft holes formed in the valve body. A communication path is formed by the cylindrical gap formed therebetween.

That is, as shown in FIG. 4, the check valve is composed of a valve stopper 2, a valve body 3 and a valve seat 4 as in the case of the first embodiment. These are appropriately combined in the order described from the downstream side to the upstream side.

As shown in FIGS. 4 and 5, a cylindrical space is formed on the upstream side of the valve stopper 2, and the vertical space of the valve body 3 is restricted by the cylindrical space and the valve seat surface 42. A housing for guiding sliding contact is formed. Further, six water guide holes 21 are formed in the valve stopper 2 so as to open in the columnar space and surround the axial center portion in each arrangement such as concentric and extend therethrough. Further, the valve body 3 is also formed with six shaft holes 31 so as to surround the shaft center portion in a concentric equiangular arrangement and extend therethrough. Further, one water supply hole 41 is formed in the valve seat 4 so as to extend through the axial center portion. However, the number of the water guiding holes 21 and the shaft holes 31 is not limited to six, and a plurality of holes can be appropriately formed. Further, in order to make the pressure distribution uniform, it is preferable to arrange them concentrically and equiangularly, but it is not limited to this. Further, a valve body surface 32 orthogonal to the stroke direction is provided on the side of the valve body facing the valve seat. In opposition to this, a valve seat surface 42 is formed on the valve seat 4 so as to be in contact with the valve body surface 32.

In the case of this embodiment, it is preferable to provide a rotation stopping mechanism for matching the positions of the water guide hole 21 of the valve stopper 2 and the shaft hole 31 of the valve body 3. For example, in the illustrated example, one or more radial grooves 2 are formed on the bottom surface of the valve stopper 2.
2 is formed and the same number of radial projections 33 are formed on the upper surface of the valve body 3 to prevent relative rotation between the valve stopper 2 and the valve body 3 by fitting the two.

When the valve body surface 32 and the valve seat surface 42 are not in contact with each other, a cylindrical gap is formed between the two surfaces, and the cylindrical gap and the shaft hole 31 of the valve body 3 form a communication path. That is, the shaft hole 31 of the valve body 3 and the water supply hole 41 of the valve seat 4 are both open at their ends. Therefore, the water supply hole 41 and the water guide hole 21
And are in communication with each other via this communication path, and pressure water flows from the former to the latter.

When the valve body surface 32 and the valve seat surface 42 are in contact with each other, no columnar gap is formed between the two surfaces and no connecting path is formed. That is, the shaft hole 31 of the valve body 3 and the valve seat 4
Both ends of the water supply hole 41 are closed. Therefore, the water supply hole 41 and the water guide hole 21 are in a non-communication state, and pressure water does not flow from the former to the latter.

FIG. 6 and FIG. 7 show a third embodiment of the check valve of the present invention, in which a valve body surface and a valve seat surface are brought into contact with a plurality of shaft holes formed in the valve body. A communication path is formed by the cylindrical gap formed therebetween.

That is, as shown in FIG. 6, the check valve is composed of the valve stopper 2, the valve body 3 and the valve seat 4 as in the case of the first embodiment. These are appropriately combined in the order described from the downstream side to the upstream side.

As shown in FIGS. 6 and 7, the valve stopper 2 is provided with a cylindrical space on the upstream side, and the cylindrical space and the valve seat surface 42 regulate the vertical movement of the valve body 3. A housing for guiding sliding contact is formed. Further, in the valve stopper 2, six water guide holes 21 are formed so as to open in the cylindrical space and surround the axial center portion in a concentric equiangular arrangement so as to extend therethrough. Further, the valve body 3 is also formed with six axial holes 31 in the peripheral portion thereof so as to extend therethrough in a concentric and equiangular arrangement. As shown, these shaft holes 31 are opened in the peripheral edge of the valve body 3. Further, one water supply hole 41 is formed in the valve seat 4 so as to extend through the axial center portion. A valve body surface 32 orthogonal to the stroke direction is provided on the side of the valve body 3 facing the valve seat 4. Valve seat 4 facing this
A valve seat surface 42 is formed so as to be in contact with the valve body surface 32.

Also in the case of this embodiment, it is preferable to provide a rotation stopping mechanism for matching the positions of the water guide hole 21 of the valve stopper 2 and the shaft hole 31 of the valve body 3. For example, a valve stopper 2 and a valve body 3 are provided by a rotation stopping mechanism as shown in FIG.
Prevent relative rotation with.

When the valve body surface 32 and the valve seat surface 42 are not in contact with each other, a cylindrical gap is formed between both surfaces, and the cylindrical gap and the shaft hole 31 of the valve body 3 form a communication path. That is, the shaft hole 31 of the valve body 3 and the water supply hole 41 of the valve seat 4 are both open at their ends. Therefore, the water supply hole 41 and the water guide hole 21
And are in communication with each other via this communication path, and pressure water flows from the former to the latter.

When the valve body surface 32 and the valve seat surface 42 are in contact with each other, no columnar gap is formed between the two surfaces and no connecting path is formed. That is, the shaft hole 31 of the valve body 3 and the valve seat 4
Both ends of the water supply hole 41 are closed. Therefore, the water supply hole 41 and the water guide hole 21 are in a non-communication state, and pressure water does not flow from the former to the latter.

8 and 9 show a fourth embodiment of the check valve according to the present invention, in which a plurality of shaft holes formed in the valve body, a cylindrical gap, and a radiation formed in the valve body 3 are shown. A communication path is formed by the hole and the axial hole.

That is, as shown in FIG. 8, the check valve is composed of the valve stopper 2, the valve body 3 and the valve seat 4 as in the case of the first embodiment. These are appropriately combined in the order described from the downstream side to the upstream side. However, in the case of this embodiment, the lower portion of the valve body 3 is fitted in the valve seat 4 when the valve body surface 32 and the valve seat surface 42 are in contact with each other.

As shown in FIGS. 8 and 9, a cylindrical space is formed on the upstream side of the valve stopper 2, and the cylindrical space and the valve seat surface 42 regulate the vertical movement of the valve body 3. A housing for guiding sliding contact is formed. Further, in the valve stopper 2, six water guide holes 21 are formed so as to open in the cylindrical space and surround the axial center portion in a concentric equiangular arrangement so as to extend therethrough. Further, one water supply hole 41 is formed in the valve seat 4 so as to extend through the axial center portion.

The valve body 3 in this embodiment has a structure slightly different from that of the above-mentioned embodiments. That is, the valve body 3
Is composed of a large-diameter upper part that fits into the cylindrical space of the valve stopper 2 and a smaller-diameter lower part that fits into the water supply hole 41 of the valve seat 4. Six shaft holes 31 are formed in the upper portion and open to the peripheral edge so as to extend through the peripheral portion in a concentric and equiangular arrangement. Further, six radiation holes 34 are concentrically equiangularly arranged to extend through the lower portion in the radial direction. These radiation holes 34 communicate with the shaft center hole 35 at the shaft center portion, and the shaft center hole 35 opens into the water supply hole 41 of the valve seat 4.

A valve body surface 32 orthogonal to the stroke direction is provided on the side of the valve body 3 facing the valve seat 4. In opposition to this, a valve seat surface 42 is formed on the valve seat 4 so as to be in contact with the valve body surface 32.

Also in this embodiment, it is preferable to provide a rotation stopping mechanism for matching the positions of the water guide hole 21 of the valve stopper 2 and the shaft hole 31 of the valve body 3. For example, a valve stopper 2 and a valve body 3 are provided by a rotation stopping mechanism as shown in FIG.
Prevent relative rotation with.

When the valve body surface 32 and the valve seat surface 42 are not in contact with each other, a cylindrical gap is formed between both surfaces, and the valve body 3
The radiating holes 34 of are opened in this cylindrical gap. Therefore, the cylindrical gap, the shaft hole 31, the radial hole 34, and the shaft center hole 35 of the valve body 3 form a communication path. That is, the shaft hole 3 of the valve body 3
Both 1 and the radiation hole 34 are open at their ends. Therefore, the water supply hole 41 and the water guide hole 21 are in communication with each other through this communication path, and the pressure water flows from the former to the latter.

When the valve body surface 32 and the valve seat surface 42 are in contact with each other, no columnar gap is formed between the two surfaces and no connecting path is formed. That is, both the axial hole 31 and the radiation hole 34 of the valve body 3 are closed at their ends. Therefore, the water supply hole 4
1 and the water guide hole 21 are in a non-communication state, and pressure water does not flow from the former to the latter.

FIGS. 10 to 12 show a fifth embodiment of the check valve according to the present invention, in which six water guiding holes and a cylindrical space are formed in the end wall of the cylindrical space of the valve stopper. The communication path is composed of and.

That is, as shown in FIG. 10, the check valve is
As in the case of the first embodiment, the valve stopper 2 and the valve body 3
And the valve seat 4. These are appropriately combined in the order described from the downstream side to the upstream side.

As shown in FIGS. 11 and 12, the valve stopper 2 has a cylindrical space on the upstream side.
The cylindrical space and the valve seat surface 42 form a housing that regulates the vertical movement of the valve body 3 and guides it in sliding contact. Further, the valve stopper 2 is formed with six water guide holes 21 which open in the cylindrical space and surround the axial center portion in a concentric equiangular arrangement so as to extend therethrough. Further, six water guiding grooves 36 are formed on the end wall of the cylindrical space so as to connect to the water guiding holes 21. Further, one water supply hole 41 is formed in the valve seat 4 so as to extend through the axial center portion. Further, the valve body 3 in this embodiment does not have a shaft hole unlike the case of the above-mentioned embodiments.

A valve body surface 32 orthogonal to the stroke direction is provided on the side of the valve body 3 facing the valve seat 4. In opposition to this, a valve seat surface 42 is formed on the valve seat 4 so as to be in contact with the valve body surface 32.

When the valve body surface 32 and the valve seat surface 42 are not in contact with each other, a cylindrical gap is formed between both surfaces, and the water guiding groove 36 formed in the end wall of the valve stopper 2 is opened in this cylindrical gap. To do. Therefore, this cylindrical gap and the water guide groove 36
And form a connecting path. That is, the end portions of both the annular hole 36 around the valve body 3 and the water supply hole 41 of the valve seat 4 are released. Therefore, the water supply hole 41 and the water guide hole 21 are in communication with each other through this communication path, and the pressure water flows from the former to the latter.

When the valve body surface 32 and the valve seat surface 42 are in contact with each other, no columnar gap is formed between the two surfaces and no connecting path is formed. That is, both the water guiding groove 36 and the water supply hole 41 are closed at their ends. Therefore, the water supply hole 41 and the water guide hole 21 are in a non-communication state, and pressure water does not flow from the former to the latter.

[0042]

According to the configuration of the present invention as described above,
The valve body and the valve seat do not need to be subjected to the conical surface processing, the workability is improved, and the one with excellent accuracy can be manufactured.
Further, since the valve body and the valve seat are in surface contact with each other, stress concentration is avoided, and wear is reduced accordingly.

In addition, in the connecting passage formed by the valve body and the valve seat, the stroke amount of the valve body becomes the width of the connecting passage as it is. Therefore, the passage cross section of the pressure water should be made sufficiently larger than that of the prior art. The pressure loss is reduced accordingly.

As shown in FIG. 13, if the outer circumference of the valve element 3 is rounded, the movement thereof becomes smooth.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional side view showing an example of a pump to which the present invention is applied.

FIG. 2 is a sectional side view showing a first embodiment of the valve of the present invention.

FIG. 3 is a bottom view showing its components.

FIG. 4 is a sectional side view showing a second embodiment of the valve of the present invention.

FIG. 5 is a bottom view showing its components.

FIG. 6 is a sectional side view showing a third embodiment of the valve of the present invention.

FIG. 7 is a bottom view showing its components.

FIG. 8 is a sectional side view showing a fourth embodiment of the valve of the present invention.

FIG. 9 is a bottom view showing the constituent elements.

FIG. 10 is a sectional side view showing a fifth embodiment of the valve of the present invention.

FIG. 11 is a bottom view showing the constituent elements.

FIG. 12 is a perspective view of the same.

FIG. 13 is a sectional side view showing still another example of the check valve of the present invention.

[Explanation of symbols]

 1: Pump 11: Check valve 2: Valve stopper 21: Water guiding hole 22: Radial groove 3: Valve body 31: Shaft hole 32: Valve body surface 33: Radial projection 34: Radiation hole 35: Shaft center hole 36: Water guiding groove 4 : Valve seat 41: Water supply hole 42: Valve seat surface

Claims (2)

[Claims] 1. A combination of a valve stopper, a valve body and a valve seat provided in a pressure water supply path for weft insertion of a water jet room, the valve stopper being a housing composed of itself and a valve seat. The valve body has a water guiding hole that opens and extends, the valve body has a valve body surface orthogonal to the stroke direction, the valve seat faces the valve body surface and is capable of face-to-face contact, and the valve It has a water supply hole that opens through the seat surface and extends therethrough, and when the valve body surface and the valve seat surface are not in contact with each other, the water supply hole is in communication with the above-mentioned water guide hole via the intermediary communication path. Check valve for water jet loom. 2. The valve stopper is formed with a plurality of water guide holes, the valve body is formed with the same number of shaft holes, and both are provided with relative rotation stop mechanisms. The check valve according to Item 1.