JP6807101B2 - Nozzle switching valve device - Google Patents

Description

The present invention relates to a nozzle switching valve device having a plurality of nozzle connection ports.

To control vegetables, a large number of nozzle switching valve devices are attached to a long boom, and a disinfectant is sprayed on a large number of vegetables at once. This nozzle switching valve device is, for example, a three-way cock valve device, and an appropriate nozzle can be selected according to the type of disinfectant and the like.

In the nozzle switching valve device described in Patent Document 1, as shown in FIG. 7, a cylindrical seal member 2 is interposed on the outer circumference of the pipe body 1, and the rotary head 3 has an axis on the pipe body 1. It is rotatably provided as the center. The rotary head 3 is provided with three nozzle connection ports 4. Various nozzles are attached to each nozzle connection port 4. By rotating the rotary head 3, each nozzle connection port 4 connects the flow path 4a of the nozzle connection port 4 to the flow path of the pipe body 1 through the through hole 2a of the seal member 2 and the through hole 1a of the pipe body 1. It is possible to connect.
In the nozzle switching valve device shown in Patent Document 1, a cylindrical seal member 2 is press-fitted between the outer peripheral surface of the pipe body 1 and the inner peripheral surface of the rotary head 3 to seal between the two. It is designed to do.

Further, in the nozzle switching valve device shown in Patent Document 2, as shown in FIG. 8, a seal member 2 having a substantially crescent-shaped cross section is used.

Japanese Unexamined Patent Publication No. 2012-237389 Japanese Unexamined Patent Publication No. 2009-22830

In the nozzle switching valve device shown in Patent Document 1, as described above, the cylindrical seal member 2a is press-fitted between the outer peripheral surface of the pipe body 1 and the inner peripheral surface of the rotary head 3. I try to seal between them. However, in the case of a method in which the cylindrical seal member 2 is press-fitted between the two members to be sealed, the amount of compression (press-fitting allowance) of the seal member 2 is determined by the dimensional relationship between the pipe body 1, the seal member 2, and the rotary head 3. ) Is liable to fluctuate, and there is a problem that the sealing property and operability are adversely affected. That is, if the press-fitting allowance of the seal member 2 is too large, the slidability of the rotary head 3 deteriorates, and there is a problem that the rotation of the rotary head 3 becomes hard and heavy. On the other hand, if the press-fitting allowance of the sealing member 2 is too small, the sealing property is deteriorated and water leakage occurs.

As described above, the nozzle switching valve device shown in Patent Document 2 uses the sealing member 2 having a crescent-shaped cross section, so that the contact area with the inner peripheral surface of the rotating head 3 is small and the slidability is good. , There is an advantage that the rotation operability of the rotation head 3 is good. However, on the other hand, as shown in FIG. 8, since only one nozzle connection port 4 can be sealed with the crescent-shaped sealing member 2, when the nozzle connection port 4 is switched, the conventional nozzle connection port 4 can be sealed. When the residual liquid disappears and enters between the outer peripheral surface of the tube body 1 and the inner peripheral surface of the rotary head 3 and flows out to the outside of the apparatus, or when it dries, the disinfectant residue remains between the two, and the rotary head There is a problem that the rotation of 3 is hindered.

Therefore, the present invention has been made to solve the above problems, and an object of the present invention is to provide a nozzle switching valve device capable of maintaining sealing performance and having good rotational operability of a rotating head. ..

In order to achieve the above object, the present invention includes the following configurations.
That is, in the nozzle switching valve device according to the present invention, one end side is formed in a connecting portion and the other end portion is closed by a lid body, and the nozzle switching valve device rotates about an axis on the outer periphery of the other end portion side of the pipe body. A nozzle connection that can be freely mounted, is provided at a required interval in the circumferential direction, is sequentially connected to the through holes provided in the pipe body at a rotational position, and can communicate with the flow path in the pipe body. A rotary head having a mouth is arranged between the outer peripheral surface of the pipe body and the inner peripheral surface of the rotary head so as to be prevented from rotating in the circumferential direction, and the through hole of the pipe body and the nozzle connection port are arranged. having a through hole that connects the to a channel, a cylindrical sealing member made of an elastic member, on the outer peripheral surface of the tube body, a groove provided in a ring shape so as to surround said hole, recess disposed in the groove, the the sealing member elastically abuts from the inside of the sealing member, and a ring-shaped elastic body which presses the sealing member to the inner peripheral surface of the part on the rotating head It is characterized by doing.

The tube body can be made of synthetic resin.
The lid is attached to a plug that fits into the center hole of the other end of the tube body and the other end of the tube body, and is in contact with the plug to position the plug in the tube body. It can be damaged by the pressure caused by the liquid in the pipe body freezing and expanding, and can be composed of a support that allows the plug body to come out of the pipe body.

In this case, a through hole is provided at the other end of the tube body so as to protrude outward from the mounting portion of the rotary head, and the support is provided in the through hole. It can be inserted.
Further, it is preferable that the support is elastically deformed and inserted into the through hole, and a protrusion that elastically returns and locks to the edge of the through hole is provided at the tip.
Further, the support can be brought into contact with the end face of the rotating head to prevent the rotating head from coming off from the tube body.

According to the present invention, since the seal member is provided in a cylindrical shape, when the rotary head is rotated and the nozzle is switched, the liquid remaining in the conventional nozzle is the inner peripheral surface of the rotary head. It is possible to prevent backflow between the and, and the sealing property is improved. Further, an elastic body such as an O-ring or packing is arranged in a concave groove provided in a ring shape so as to surround the through hole, and the elastic body elastically contacts the seal member from the inside to partially contact the seal member. The pressure is applied to the inner peripheral surface of the rotating head (stronger than other parts). As a result, the sealing property between the flow path of the nozzle connection port and the through hole of the pipe body is good, and the sealing member is press-fitted between the pipe body and the rotary head over the entire circumference as in the conventional case. Since the seal member is partially strongly pressed against the inner peripheral surface of the rotating head, the sliding resistance of the rotating head can be reduced and the operability is improved.

It is sectional drawing of the nozzle switching valve device. It is sectional drawing in the nozzle connection port part. It is an assembly drawing which shows the seal structure by a seal member. It is explanatory drawing which shows the nozzle connection port. It is a partially enlarged sectional view of the nozzle switching valve device. It is explanatory drawing which shows the state which the support was inserted through the through hole. It is sectional drawing which shows the seal structure by the conventional seal member. It is sectional drawing which shows the other sealing structure by the conventional sealing member.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of the nozzle switching valve device 10 according to the present embodiment, and FIG. 2 is a cross-sectional view of a nozzle connection port portion. FIG. 3 is an assembly drawing showing a seal structure made of a seal member.
Since the basic structure of the nozzle switching valve device 10 may be a known one, it will be briefly described below.
Reference numeral 12 denotes a tube main body, which is integrally formed of a synthetic resin in a substantially T shape in the present embodiment.

One end side of the pipe body 12 is formed in a connecting portion 13 which is a portion connected to a chemical solution supply pipe (not shown) such as a boom. Further, the other end side of the pipe body 12 is formed in the ejection portion 14, and the end portion of the flow path 14a of the ejection portion 14 is closed by the lid body 15. The lid 15 will be described in detail later.
The portion of the pipe body 12 opposite to the connecting portion 13 is formed in a double pipe portion 18 composed of an inner pipe 16 and an outer pipe 17.

A diaphragm valve 20 having an open end of the inner pipe 16 as a valve seat is provided at the end of the double pipe portion 18. The diaphragm valve 20 closes the open end of the outer pipe 17, and when the diaphragm valve 20 opens and closes the valve seat, the flow path 17a of the outer pipe 17 leading to the connection portion 13 and the ejection portion 14 The communication with the flow path 16a of the inner pipe 16 leading to the flow path 14a of the above is interrupted.

Reference numeral 22 is a pressing body, and 23 is a valve supporting member. A coil spring 24 is interposed between the pressing body 22 and the valve supporting member 23, and the coil spring 24 causes the diaphragm valve 20 to be attached to the valve seat via the pressing body 22. It is being pressed. Reference numeral 25 denotes a cap, which is screwed to the double pipe portion 18 to tighten the valve support member 23 so as to sandwich the outer peripheral portion of the diaphragm valve 20 between the valve support member 23 and the end face of the outer pipe 17. It has become.

When a liquid of a required pressure flows into the flow path 17a of the outer pipe 17, the diaphragm valve 20 is pushed against the urging force of the coil spring 24 by this liquid pressure, the valve seat is opened, and the liquid flows into the inner pipe 16. It flows from the flow path 16a into the flow path 14a of the ejection portion 14 at a constant pressure.

The end portion of the ejection portion 14 is formed in a small diameter portion 14b having a diameter smaller than that of the ejection portion 14.
A rotating head 27 is rotatably mounted around the axis of the ejection portion (tube body) 14 between the outer circumference of the ejection portion 14 and the outer circumference of the small diameter portion 14b. The end portion of the small diameter portion 14b projects outward from the mounting portion of the rotary head 27.
A plurality of nozzle connection ports 28 (three in the figure) are provided on the outer periphery of the rotary head 27 at equal intervals in the circumferential direction. The rotary head 27 and the nozzle connection port 28 are integrally formed of synthetic resin.

O-rings 29 and 30 are interposed between the inner peripheral surface of the rotary head 27 and the outer peripheral surface of the ejection portion 14 and between the inner peripheral surface of the rotary head 27 and the outer peripheral surface of the small diameter portion 14b, respectively, and liquid is interposed between the two. It is tightly sealed. An appropriate nozzle (not shown) is attached to each nozzle connection port 28.

A through hole 14c leading to the flow path 14a is provided at an appropriate position on the circumference of the ejection portion 14 where the nozzle connection port 28 rotates.
A cylindrical sealing member 31 made of an elastic member such as rubber is arranged between the outer peripheral surface of the small diameter portion (tube body) 14b and the inner peripheral surface of the rotating head 27. As shown in FIG. 3, the sealing member 31 is prevented from rotating with respect to the small diameter portion 14b by fitting the convex portion 14d formed in the small diameter portion 14b into the notch portion 31a formed at the end portion of the seal member 31. Has been done.

The seal member 31 is formed with a through hole 31b that connects the through hole 14c of the small diameter portion (tube body) 14b and the flow path 28a of the nozzle connection port 28.
Further, as shown in FIG. 3, a ring-shaped concave groove 14e is provided on the outer peripheral surface of the small diameter portion 14b so as to surround the through hole 14c. An O-ring made of an elastic member such as rubber and an elastic body such as packing (hereinafter referred to as an O-ring) 32 are arranged in the ring-shaped concave groove 14e. The O-ring 32 elastically contacts the seal member 31 from the inside and partially presses the seal member 31 against the inner peripheral surface of the rotary head 27.

By rotating the rotation head 27 around the axis, each flow path 28a communicating with the nozzle connection port 28 communicates with the flow path 14a of the ejection portion 14 sequentially through the through hole 31b and the through hole 14c at the required rotation position. .. By attaching different types of nozzles (not shown) to each nozzle connection port 28, the rotary head 27 can be rotated to select and use a required nozzle, and the chemical solution can be used according to an appropriate ejection mode. Can be sprayed.

In the present embodiment, since the seal member 31 is provided in a cylindrical shape as described above, when the rotary head 27 is rotated and the nozzle is switched, the liquid remaining in the conventional nozzle is the rotary head 27. It is possible to prevent backflow between the inner peripheral surface and the outer peripheral surface of the small diameter portion (tube body) 14b, and the sealing property is improved.
Further, as described above, the O-ring 32 is arranged in the concave groove 14e provided in a ring shape so as to surround the through hole 14c, and the O-ring 32 elastically contacts the seal member 31 from the inside to form the seal member. The 31 is partially pressed against the inner peripheral surface of the rotating head 27 (stronger than other parts). As a result, the sealing property between the flow path 28a and the through hole 14c is good, and the sealing member is press-fitted between the pipe body and the rotary head over the entire circumference as in the conventional case. Since the seal member 31 is partially strongly pressed against the inner peripheral surface of the rotary head 27, the sliding resistance of the rotary head 27 can be reduced and the operability is improved.

Next, the lid 15 will be described.
As shown in FIG. 5, the lid 15 has a metal plug 34 that fits into the central hole 33 of the small diameter portion 14b of the ejection portion 14, and the plug 34 that comes into contact with the plug 34 and is inserted into the pipe body 12. It has a support 36 that supports it so as to be located at.
By fitting the plug 34 into the central hole 33, the flow path 14a of the ejection portion 14 is closed.
The central hole 33 in the small diameter portion 14b has a small diameter hole 33a having the same diameter as the flow path 14a, a tapered hole 33b that gradually expands outward from the small diameter hole 33a, and the same diameter following the tapered hole 33b. It has a large diameter hole 33c that extends.

The plug body 34 has a small diameter portion 34a that fits into the small diameter hole 33a, a tapered portion 34b that fits into the tapered hole 33b, and a large diameter portion 34c that fits into the large diameter hole 33c. The plug body 34 is positioned by restricting the entry position into the central hole 33 by the tapered portion 34b abutting on the tapered surface of the tapered hole 33b.
An O-ring 35 is fitted in the peripheral groove provided on the outer periphery of the small diameter portion 34a, and the O-ring 35 seals between the outer peripheral surface of the plug body 34 and the inner peripheral surface of the center hole 33.

The plug body 34 is supported by the support body 36 in a state of being fitted into the central hole 33. The support body 36 supports the plug body 34 so that the plug body 34 does not come out of the central hole 33 due to the liquid pressure (maximum pressure) at the time of spraying the liquid, but the liquid in the tube body 12 is of course supported. The support 36 can be damaged by the pressure caused by freezing and expanding, and at that time, the plug 34 comes out of the central hole 33 of the small diameter portion 14b (tube body) by the pressure.

A specific example of the support 36 will be further described.
As shown in FIG. 6, a relatively wide through hole 38 that penetrates the small diameter portion 14b in the radial direction is formed in a portion of the small diameter portion 14b that protrudes outward from the mounting portion of the rotating head 27. Has been done. The width of the through hole 38 is set to be larger than the diameter of the large diameter hole 33c of the central hole 33.

As shown in FIG. 6, the support 36 in the present embodiment is formed in a wedge-shaped support inserted through the through hole 38, and the flange portion 36b is provided at the base end portion 36a. Further, three branch pieces 36c, 36d, and 36e extending from the base end portion 36a toward the tip end side are provided. Protrusions 37 protruding outward are provided at the tip portions of the branch pieces 36c and 36e on both end sides. The support 36 is integrally formed of synthetic resin.

When the support 36 is pushed so that the branch pieces 36c, 36d, 36e enter the through hole 38, the branch pieces 36c, 36e enter into the through hole 38 while being elastically deformed, and when they enter the depth, they return to elasticity. Then, the protrusion 37 is locked to the inner edge of the through hole 38, and at the same time, the flange portion 36b is also locked to the edge of the through hole 38 on the entrance side.

As a result, the support body 36 itself is prevented from coming off, and the branch piece 36d of the support body 36 comes into contact with the outer end surface of the large diameter portion 34c of the plug body 34 to prevent the plug body 34 from coming off. ing. Further, a part of the branch pieces 36c and 36e also presses a part of the outer circumference of the large diameter portion 34c of the plug body 34.

At the same time, as shown in FIG. 4, the flange portion 36b of the support 36 and the tip portions of the branch pieces 36c, 36d, 36e come into contact with the outer surface of the rotary head 27, and the support 36 causes the rotary head 27 to come into contact with the outer surface. It is designed to prevent it from coming off from the tube body (spouting portion) 12. Specifically, the flange portion 27a extending inward of the rotary head 27 is a step between the flange portion 36b of the support 36, the tip portions of the branch pieces 36c, 36d, and 36e, and the small diameter portion 14b and the ejection portion 14. The rotating head 27 is positioned and prevented from coming off by holding it between the wall and the wall.

The support 36 is configured as described above.
As described above, the support 36 prevents the plug 34 from coming off from the central hole 33 and the rotary head 27 from the pipe body 12. Further, in the support 36, when the liquid in the pipe body 12 freezes and expands during the winter, the branch pieces 36d and the branch pieces 36c and 36e are damaged by the pressure, whereby the plug 34 becomes the central hole. By escaping from 33 and releasing the pressure, damage to the pipe body 12 is prevented.

That is, in the present embodiment, the support 36 is intentionally damaged by the expansion pressure due to the freezing of the liquid, so that the pipe body 12 is prevented from being damaged.
To repair the broken nozzle device 10, a new plug body 34 and a new support body 36 may be used, the plug body 34 may be pushed into the central hole 33, and the support body 36 may be inserted through the through hole 38. But it can be done easily. In some cases, the conventional plug 34 can be used as it is. That is, it is not necessary to replace the entire nozzle switching valve device 10, and the pipe body 12 can be used as it is, so that the repair cost can be reduced.

In the above embodiment, the support 36 is used to position and prevent the rotary head 27 from coming off. However, the rotary head 27 can be positioned and prevented from coming off by a conventional mechanism other than the support 36. Good.
Further, the support 36 used has three branch pieces 36c, 36d, 36e, but is not limited to this, and is a locking piece having one or a plurality of breakable branch pieces as appropriate. Can be done.

Further, in the above embodiment, the support body 36 is inserted through the through hole 38 provided in the small diameter portion 14b to support the plug body 34, but the support body 36 is provided on the outer periphery of the small diameter portion 14b. It may be provided in the shape of a cap to be screwed into the male screw portion (not shown), and the outer end surface of the plug body 34 may be supported by the inner bottom surface thereof. Alternatively, the support 36 is provided in a form that is slidably fitted into parallel grooves (not shown) provided in the radial direction on both outer peripheral surfaces of the small diameter portion 14b to support the outer end surface of the plug 34. You may try to do it. Even in this case, it goes without saying that the support 36 is designed to have a strength that allows it to be damaged by the expansion pressure caused by the freezing of the liquid in the pipe body 12.

In the above embodiment, the lid body 15 is composed of the plug body 34, the support body 36, and the like, but the lid body is not limited to this, and the lid body is screwed to the small diameter portion 14b, which is a simple cap type (not shown). ) Etc. may be used.
Further, in the above embodiment, the tube main body 12 has a structure of a T-shaped tube main body, but the present invention is not limited to this, and various structures such as a linear tubular body are used depending on the application. Can be adopted. The valve body is not limited to the diaphragm valve, and may be a normal valve body, or in some cases, a valve device having a simple structure without a valve body.

10 Nozzle switching valve device, 12 pipe body, 13 connection part, 14 ejection part (tube body), 14a flow path, 14b small diameter part, 14c through hole, 14d convex part, 14e concave groove, 15 lid, 16 inner pipe , 16a flow path, 17 outer pipe, 17a flow path, 18 double pipe part, 20 diameter valve, 22 pressing body, 23 valve support member, 24 coil spring, 25 cap, 27 rotating head, 28 nozzle connection port, 28a flow Road, 29 O-ring, 30 O-ring, 31 seal member, 31a notch, 31b through hole, 32 elastic body, 33 center hole, 33a small diameter hole, 33b taper hole, 33c large diameter hole, 34 plug body, 34a small diameter part , 34b taper part, 34c large diameter part, 35 O-ring, 36 support, 36a base end part, 36b flange part, 36c branch piece, 36d branch piece, 36e branch piece, 38 through hole

Claims (1)

A tube body with one end formed in the connection and the other end closed by a lid.
It is rotatably mounted on the outer periphery of the other end side of the pipe body around the axis, and is provided in plurality at a required interval in the circumferential direction, and is sequentially connected to the through holes provided in the pipe body at the rotational position. Then, a rotating head having a nozzle connection port that can communicate with the flow path in the pipe body,
It is arranged so as to be prevented from rotating in the circumferential direction between the outer peripheral surface of the pipe body and the inner peripheral surface of the rotating head, and is connected to the through hole of the pipe body and the flow path of the nozzle connection port. A cylindrical seal member made of an elastic member having a through hole,
The outer peripheral surface of the tube body, a groove provided in a ring shape so as to surround said hole,
Disposed concave groove, and wherein the sealing member elastically abuts from the inside of the sealing member, the sealing member is pressed against the inner peripheral surface of the part on the rotating head ring-shaped elastic body A nozzle switching valve device characterized by being provided with.