JP5749702B2 - Liquid dilution device - Google Patents

Description

  The present invention relates to a liquid agent dilution device that mixes a liquid agent with water supplied from a water supply facility, and more particularly, to a device having a so-called ejector jet pump structure that sucks a liquid agent by generating a negative pressure in a main flow path.

Conventionally, in order to dilute and use liquid fertilizers, agricultural chemicals, detergents and other liquid agents in water, liquid agent diluting devices have been used.
Some conventional liquid agent diluting apparatuses have a main channel that allows water to pass therethrough and a liquid agent channel that joins the main channel and introduces the liquid agent into the main channel, as in Patent Document 1. At the junction of the main flow path and the liquid agent flow path, an ejector part is formed by forming a large-diameter diffusion part on the downstream side of the small-diameter venturi part. Negative water generated when water passes through this ejector part. The liquid was sucked from the liquid flow path by the pressure.
Moreover, in the liquid agent dilution apparatus of Patent Document 1, in order to adjust the introduction amount of the liquid agent, a constriction part (jet) is provided in the liquid agent flow path, and a plurality of constriction parts having different diameters on one rotatable member And one of these jets can be selectively placed in the liquid agent flow path.

Since the liquid agent flow path is formed to be relatively narrow in order to enable suction of the liquid agent by negative pressure, there is a possibility that clogging may occur due to small dust or the like mixed in the liquid agent. In addition, there is a possibility that clogging may occur due to the liquid agent being dried and sticking, or the component of the liquid agent being deposited.
In particular, in a liquid agent dilution apparatus in which a constricted portion (jet) is provided in a liquid agent flow channel as in Patent Document 1, this problem is remarkable.

  Therefore, in the liquid agent diluting device of Patent Document 1, a cleaning flow path branched from the main flow path is provided, and in this cleaning flow path, a narrow portion (jet) that is not arranged in the liquid flow path is positioned, The narrow portion (jet) that is not disposed in the liquid agent flow path is washed with water that passes through the cleaning flow path.

However, in Patent Document 1, there is a problem that the size of the apparatus increases because it is necessary to provide a special cleaning passage.
In addition, the cleaning flow path has a complicated structure in which it is branched from the main flow path upstream of the ejector section, goes back in the opposite direction to the main flow path, and merges with the main flow path further upstream. The processing cost increased with the increase.
Furthermore, since a large number of sealing members are required to keep the constriction (jet) disposed in the liquid agent flow path and the constriction (jet) disposed in the cleaning flow path in a non-communication state, the material cost is reduced. There was a risk of malfunction due to wear as the amount of wear increased.

Japanese Patent No. 4197887

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a liquid agent diluting apparatus that can effectively clean the liquid agent flow path with a simple configuration.

In the present invention, means for solving the above problems are as follows.
1st invention has the main flow path which lets water pass, and the liquid agent flow path which joins this main flow path, and introduce | transduces a liquid agent into this main flow path, The said main flow path, the said liquid supply flow path, In the liquid agent diluting device provided with an ejector part for sucking the liquid agent from the liquid agent flow path by the negative pressure of water passing through the main flow path, the junction part is connected to and / or near the ejector part. The liquid agent flow path is formed between the mating surfaces of two liquid agent flow path dividing members that can approach and separate from each other, and passes through the main flow path when one of the liquid agent flow path dividing members is separated from the other. The liquid agent flow path connected to the ejector section and / or disposed in the vicinity thereof with water is washed.

  According to a second aspect of the present invention, when one of the liquid agent flow path dividing members is separated from the other, the liquid agent is not introduced into the main flow path, and a raw water state in which water passes through the main flow path can be obtained. Features.

  According to a third aspect of the present invention, when one of the liquid channel dividing members is separated from the other, all or a part of the water branches from the main channel, and the mating surfaces of the two liquid channel dividing members A cleaning bypass flow path is formed, which flows into a gap formed between the main flow paths and joins the main flow path along the mating surface.

  A fourth invention is characterized in that a check valve for preventing a back flow of the liquid agent or the water is provided at a position upstream of the mating surface of the two liquid agent flow path dividing members in the liquid agent flow path.

  According to the first invention, the liquid agent flow path connected to and / or in the vicinity of the ejector portion is formed between the mating surfaces of the two liquid agent flow path dividing members that can approach and separate from each other. When one of the flow path dividing members is separated from the other, water that passes through the main flow path is connected to the ejector section and / or the liquid flow path disposed in the vicinity thereof is washed, so that small dust is collected. And clogging of the liquid agent flow path due to components deposited from the liquid agent or the like can be automatically prevented.

  According to the second invention, when one of the liquid agent flow path dividing members is separated from the other, the liquid agent is not introduced into the main flow path, and the raw water state allows water to pass through the main flow path. By being able to do so, whenever a user switches a liquid agent dilution apparatus from a dilution state to a raw | natural water state, the liquid agent flow path near an ejector part can be automatically wash | cleaned.

  According to the third invention, when one of the liquid channel dividing members is separated from the other, all or a part of the water branches from the main channel, and the two liquid channel dividing members By forming a cleaning bypass channel that flows into the gap formed between the mating surfaces and merges with the main channel along the mating surface, the gap between the mating surfaces of the two liquid agent channel members is reduced. Since the amount of flowing water increases, cleaning performance can be improved.

  According to the fourth aspect of the present invention, a check valve for preventing a back flow of the liquid agent or the water is provided at a position upstream from the mating surface of the two liquid agent flow path dividing members, thereby providing a liquid supply source (for example, It is possible to prevent the backflow of water or liquid into a tank containing the liquid.

It is sectional drawing which shows the liquid agent dilution apparatus which concerns on 1st embodiment of this invention, (a) is a diluted state, (b) has shown the raw | natural water state. It is sectional explanatory drawing which shows the flow of the water and liquid agent vicinity of the ejector part of the liquid agent dilution apparatus, (a) has shown the diluted state, (b) has shown the raw | natural water state. It is a partially notched perspective view which shows the groove-shaped flow path of the mating surface of the downstream pipe | tube of the same liquid agent dilution apparatus. (A)-(h) is explanatory drawing which shows the example of the cross-sectional shape of the same groove-shaped flow path, respectively. It is a partial notch sectional view which shows the non-return valve arrange | positioned at the liquid agent flow path of the liquid agent dilution apparatus. It is a perspective view which shows the liquid agent dilution water spraying apparatus with a watering nozzle as an example of use of the same liquid material dilution apparatus. It is sectional explanatory drawing which shows the flow of the water and liquid agent vicinity of the ejector part of the liquid agent dilution apparatus which concerns on 2nd embodiment of this invention, (a) is a diluted state, (b) has shown the raw | natural water state.

Hereinafter, the liquid agent dilution apparatus according to the first embodiment of the present invention will be described.
The liquid agent dilution apparatus 1 is used for diluting a liquid agent in water.
Various liquid agents such as liquid fertilizers, chemicals such as agricultural chemicals, detergents used for car washing, and the like can be used and are not particularly limited.
“Water” includes tap water and other water as well as other liquids that can serve as a solvent for the liquid agent. Moreover, what dissolved substances other than a liquid agent beforehand in these may be used.

The liquid agent diluting device 1 of the present invention is built in the diluting water using device itself such as a gardening watering nozzle, or connected to the using device 2 via a hose or the like as shown in FIG. You may make it do. Further, instead of connecting the liquid agent diluting device to the using device, the obtained diluting water may be stored in a container, and the container may be stored and transported so that the diluting water can be used at the transportation destination.
That is, the configuration on the upstream side of the water intake port and the configuration on the downstream side of the ejector portion described later are not particularly limited.
Further, the supply source of the liquid agent may be any one such as a liquid agent tank and is not particularly limited.

As shown in FIG. 1, the liquid agent dilution apparatus 1 includes a main flow path 3 through which water passes and a liquid agent flow path 4 that joins the main flow path 3 and introduces the liquid agent into the main flow path 3. .
As shown by the arrow in FIG. 2A, water passes through the main channel 3 from right to left in the figure, and the liquid agent passes through the liquid agent channel 4 from bottom to top in the figure.
Although the upstream side of the main flow path 3 is connected to water supply etc., as above-mentioned, it is not limited to this.
The upstream side of the liquid agent flow path 4 is connected to a liquid agent supply source such as the liquid agent tank 5 shown in FIG. 6, but is not limited to this as described above.

In the liquid agent dilution apparatus 1, the main flow path 3 is formed of an upstream pipe 6, a movable pipe 7, and a downstream pipe 8 in order from the upstream side.
Plastic, metal, glass, and elastic material (rubber or elastomer) can be used for the material of each of these parts.
It is more preferable to use plastic, stainless steel, or aluminum because it is lightweight, does not rust, is not easily broken, and is easy to process. Among these, it is particularly preferable to use plastic because raw materials and processing costs are low.
Among plastics, thermoplastics with high versatility for industrial products are preferred. ABS (Acrylonitrile / Butadiene / Styrene Copolymer) resins are preferred when emphasizing appearance and dimensional accuracy, and emphasis is placed on chemical resistance against detergents. In this case, PP (polypropylene), PE (polyethylene), PVC (polyvinyl chloride), and fluororesin are preferable, and POM (polyacetal) is preferable when strength is important.
Moreover, when an elastic material is used, the sealing performance between components can be improved and the precision of the dilution rate of dilution water can be improved.
Furthermore, SUS (stainless steel), which has high corrosion resistance and high versatility, is particularly preferable for metals.
In the first embodiment, an ABS resin having high sealing performance at the mating surface between components and excellent in appearance and strength is used as the material of each component.

As shown in FIG. 1, the movable tube 7 is held in a space formed between the upstream tube 6 and the downstream tube 8 so as to be movable in the upstream and downstream directions. A plurality of O-rings 9 a, 9 b, 9 c are fitted on the outer periphery of the movable tube 7, and the respective O-rings 9 a, 9 b, 9 c are always in contact with the inner peripheral surface of the upstream side tube 6 or the downstream side tube 8. Further, water leakage to the operation member 10 side described later is prevented.
The upstream pipe 6 and the downstream pipe 8 are each formed in a stepped shape in order to incorporate the movable pipe 7.

Outside the movable tube 7, a cylindrical operation member 10 for operating the movable tube 7 is rotatably held between the upstream tube 6 and the downstream tube 8. From the movable tube 7, a thin plate-like male screw portion 7a projects vertically. A screw groove is formed at the tip of the male screw portion 7 a and engages with a screw groove of a female screw portion formed on the inner peripheral surface of the operation member 10.
The operation member 10 may be appropriately protruded with an operation lever 10a (see FIG. 6).

Between the operation member 10 and the movable tube 7, a pair of co-rotation prevention members 11 having a vertically-divided cylinder is disposed, and the side surface of the male threaded portion 7 a of the movable tube 7 is sandwiched. Since the co-rotation prevention member 11 is fixed so as not to rotate with respect to the upstream side pipe 6 and the downstream side pipe 8, the movable pipe 7 sandwiched between the co-rotation prevention members 11 cannot also rotate and cannot be rotated together with the operation member 10. There is no turning.
Therefore, when the operation member 10 is rotated in the circumferential direction, the movable tube 7 does not rotate but moves closer to and away from the downstream tube 8 along the female screw portion.
The movable tube 7 is restricted in the upstream side of the movable range by contacting the stepped portion of the upstream tube 6 (FIG. 1A), and the downstream side of the movable range by contacting the stepped portion of the downstream tube 8. Is limited (FIG. 1B).

The shape of the operation member 10 is not particularly limited, and is a lever type using a screw connection, a cam or a valve, a push button type, a slide button type, a seesaw type switch type, or a rotary type (dial Any shape that can be moved closer to and away from the downstream side pipe by interlocking the movable pipe can be adopted.
In the first embodiment, the lever type operation member 10 using the screw coupling as described above is used.

In the diluted state shown in FIGS. 1 (a) and 2 (a), an ejector section 12 for generating a negative pressure is formed at the junction of the main flow path 3 with the liquid agent flow path 4. The ejector section 12 includes a small diameter venturi section 13 provided at the downstream end of the movable pipe 7 and a flow path (diffusion section) of a large diameter downstream pipe 8 positioned immediately downstream of the venturi section 13 in a diluted state. 14).
When the water accelerated when passing through the venturi part 13 diffuses while maintaining the flow rate in the diffusion part 14, a negative pressure is generated in the ejector part 12, and the negative pressure causes the liquid agent 4 to be sucked from the liquid agent flow path 4. it can.

  The diameter of the venturi portion 13 is preferably set to 0.5 to 10 mm. If the diameter is less than 0.5 mm, the pressure loss of the flow path becomes too large and the production amount of dilution water is reduced. The diameter is more preferably 1 mm or more, and particularly preferably 1.5 mm or more. Further, if the diameter is larger than 10 mm, the material cost increases due to the increase in size, and the dilution performance becomes unstable when the main channel has a low water pressure. The diameter is more preferably 8 mm or less, and particularly preferably 5 mm or less.

  The diameter of the flow path in the movable tube 7 on the upstream side of the venturi section 13 is preferably set larger than the diameter of the venturi section 13 and is preferably 1 to 30 mm. If the diameter is less than 1 mm, the pressure loss of the flow path becomes too large. The diameter is more preferably 3 mm or more, and particularly preferably 5 mm or more. Moreover, if the diameter is larger than 30 mm, the material cost increases due to the increase in size. The diameter is more preferably 20 mm or less, and particularly preferably 10 mm or less.

  The diameter of the flow path of the downstream pipe 8 in which the small diameter part of the movable pipe 7 including the venturi portion 13 is accommodated is 3 to 35 mm in consideration of the outer diameter of the movable pipe 7, the size of the O-ring 9a, and the material. Is preferable. If the diameter is smaller than 3 mm, the pressure loss of the flow path becomes too large. The diameter is more preferably 5 mm or more, and particularly preferably 8 mm or more. If the diameter is larger than 35 mm, the material cost increases due to the increase in size. The diameter is preferably 25 mm or less, and particularly preferably 20 mm or less.

  Further, the diameter of the diffusion portion 14 of the downstream side pipe 8 is preferably set to 1.5 to 3 times the diameter of the venturi portion 13. If the diameter of the venturi portion 13 is less than 1.5 times, the liquid agent may not be sucked due to variations in component accuracy. Further, if the diameter is larger than three times the diameter of the venturi portion 13, there is a possibility that the liquid suction amount is lowered. In the first embodiment, the diameter of the diffusion part is set to 1.5 times the diameter of the venturi part 13 in order to stabilize the dilution rate when the main flow path 3 is at a low water pressure.

  As shown in FIG. 3, a groove-like flow path 15 is engraved from the bottom to the top in the step portion of the downstream pipe 8 that contacts the downstream end face of the movable pipe 7. In the middle of the groove-like flow path 15, a narrowed portion 16 having a groove width narrower than other portions is provided in order to increase the pressure loss and adjust the amount of the liquid agent introduced into the main flow path 3. The narrowed portion 16 and other portions are connected by a gentle inclination.

The cross-sectional area of the narrowed portion 16 and the ratio of the length between the narrowed portion 16 and the groove-like flow path 15 are set according to the necessary dilution factor. The smaller the cross-sectional area of the narrowed portion 16 and the longer the length of the narrowed portion 16, the smaller the amount of liquid agent introduced into the main flow path 3 with respect to a certain negative pressure. On the other hand, when the length of the narrowed portion 16 is increased, the mold for forming the narrowed portion 16 is likely to be deteriorated and damaged, and the narrowed portion 16 is liable to be clogged. There is a problem that it takes a long time to obtain diluted water having a desired dilution concentration after switching from the raw water state to the diluted state.
In the first embodiment, the length of the narrowed portion 16 is set to 1 mm.

The cross-sectional area of the narrowed portion 16 is preferably 0.005 to 0.5 mm ² . If the cross-sectional area is less than 0.005 mm ^2, the dispersion of the dilution ratio due to the water pressure in the main flow path 3 becomes large. More preferably to the cross-sectional area 0.006 mm ² or more, particularly preferably to 0.008 mm ² or more. On the other hand, if the cross-sectional area is larger than 0.5 mm ² , the amount of the liquid agent introduced becomes large and the dilution factor becomes low. The cross-sectional area is more preferably 0.3 mm ² or less, and particularly preferably 0.1 mm ² or less.
For example, when it is desired to obtain diluted water having a dilution ratio of 250, the cross-sectional area of the narrowed portion 16 is preferably set to 0.008 to 0.070 mm ² . In the first embodiment, the cross-sectional area of the narrowed portion 16 is 0.050 mm ² in order to obtain a dilution factor of about 250 times.

The cross-sectional shape of the groove-like flow path 15 is a square shape as shown in FIG. 4A, a rectangular shape as shown in FIG. 4B, a triangular shape as shown in FIG. 4C, and as shown in FIG. Various trapezoidal shapes, semicircular shapes as shown in FIG. 4 (e), semi-elliptical shapes as shown in FIG. 4 (f), arc shapes, and shapes formed by combinations of arcs and straight lines as shown in FIG. 4 (g). Shape can be adopted.
In the first embodiment, the trapezoidal shape shown in FIG.
As shown in FIG. 4 (h), the cross-sectional shape in which the bottom of the groove-like flow path 15 is formed wider than the other part is difficult to draw out the mold and is not suitable for mold forming. In the case where the groove-like flow path 15 is formed by shaping into a flat surface and then shaving, the cross-sectional shape as shown in FIG.

A part of the liquid agent flow path 4 is formed between the mating surfaces where the stepped portion of the downstream pipe 8 in which the groove-shaped flow path 15 is formed and the downstream end face of the movable pipe 7 are in contact with each other. The downstream side pipe 8 and the movable pipe 7 have a function as a liquid agent channel dividing member that forms the liquid agent channel 4 between the mating surfaces by contact.
In the following, the mating surface means the mating surface between the surface of the downstream side tube 8 on which the groove-like flow path 15 is formed and the downstream side end surface of the movable tube 7.

In the first embodiment, the groove-like flow path 15 is formed on the mating surface of the downstream side pipe 8, but on the contrary, the groove-like flow path may be formed on the mating surface of the movable pipe 7, A groove-like channel may be formed on the mating surfaces of both the downstream pipe 8 and the movable pipe 7.
When the groove-like channel 15 is formed on the mating surface of the downstream side pipe 8, the groove-like channel 15 faces the upstream side of the main channel 3, and the momentum of the water colliding with the groove-like channel 15 in the raw water state described later. Is preferable, and the cleaning performance is improved.

  Further, in the first embodiment, the downstream pipe 8 located downstream is fixed and the movable pipe 7 located upstream is approached and separated. On the contrary, among the liquid agent flow dividing members, the upstream pipe 8 is located upstream. It is also possible to fix the one located on the side and approach the one located on the downstream side.

Further, the liquid agent flow path 4 may be configured by sandwiching another member between the downstream side pipe 8 and the movable pipe 7.
For example, a structure in which the liquid agent flow channel 4 is formed on the mating surface of the movable tube 7 and another part in which a groove-shaped channel is formed instead of the downstream tube 8, and an end surface serving as a mating surface is formed instead of the movable tube 7. It can be set as the structure which forms the liquid agent flow path 4 in the mating surface of another part and the downstream pipe | tube 8. FIG.
Further, neither the downstream pipe 8 nor the movable pipe 7 is used as a liquid channel dividing member, and the first separate part fixed to the downstream pipe 8 and the second separate part fixed to the movable pipe 7 are combined. It is good also as a structure which forms a liquid agent flow path in the surface.
In this way, by using another component as the liquid agent channel dividing member, the processing accuracy of the component can be improved, and the dimensional accuracy of the liquid agent channel and the sealing performance of the mating surface can be improved.
In order to improve the sealing performance of the mating surfaces, it is particularly preferable to use an elastic material such as rubber or elastomer as the material of the separate part.

  In the diluted state shown in FIG. 1A and FIG. 2A, the liquid agent flow path 4 includes a liquid agent pipe 17 integrally formed on the peripheral surface of the downstream pipe 8 in order from the upstream side, and a downstream pipe 8. It is formed of a space formed between the inner surface and the outer surface of the movable tube 7 and a groove-like flow path 15 formed between the downstream surface of the downstream tube 8 and the movable tube 7.

A plurality of sets of the groove-like flow path 15 and the narrowed portion 16 can be provided, but it is preferable to provide only one set because there is a possibility that the dilution water cannot be set to a desired dilution ratio depending on the processing accuracy of the parts.
Even when a plurality of constrictions 16 having different widths are provided and a variable mechanism for dilution ratio is provided by selectively disposing one constriction 16 in the liquid agent flow path 3, the number of constrictions 16 is different for each width. It is preferable to minimize the required number, such as one each.

  The diameter of the flow path of the liquid agent pipe 17 in the downstream pipe 8 is preferably set to 0.2 to 10 mm. If the diameter is 0.2 mm, pressure loss may occur depending on the specific gravity and viscosity of the liquid agent, and the liquid agent may not be introduced into the main flow path 3. The diameter is more preferably 0.5 mm or more, and particularly preferably 1.0 mm or more. If the diameter is larger than 10 mm, the material cost increases due to the increase in size. The diameter is more preferably 7 mm or less, and particularly preferably 3 mm or less.

  The cross section of the main flow path 3 and the liquid agent tube 17 is not necessarily limited to a circular shape. However, if the cross section has an angular shape, dust easily collects at the corners. Therefore, the circular shape or the elliptical shape is preferable. In the first embodiment, since plastic is used as a material, a circular shape is used for ease of molding by a mold.

  In order to assemble such a liquid agent diluting device 1, first, the male threaded portion 7a of the movable tube 7 is sandwiched by the co-rotation preventing member 11, and then the movable tube 7 and the operation member 10 are attached by screw coupling, and upstream from the front and back The side pipe 6 and the downstream pipe 8 are assembled.

In the liquid agent dilution apparatus 1 according to the first embodiment, the liquid agent flow path 4 is formed as described above in the diluted state in which the mating surfaces of the downstream pipe 8 and the movable pipe 7 are in contact with each other as shown in FIG. Then, due to the negative pressure of the water passing through the ejector section 12, the liquid agent is sucked from the liquid agent flow path, and diluted water having a predetermined dilution rate can be obtained.
At this time, small dust contained in the liquid agent, components deposited from the liquid agent, or the like may be deposited in the groove-like flow path 15, particularly in the narrow constricted portion 16.

As shown in FIG. 2B, in the raw water state in which the movable tube 7 is separated from the downstream side tube 8, it is relatively large between the groove-like flow path 15 and the downstream end surface (mating surface) of the movable tube 7. A gap is formed. For this reason, the liquid agent is not introduced from the liquid agent channel 4 into the main channel 3, and water flows out through the main channel 3 to the downstream side.
Further, when the operation member 10 is rotated from the diluted state to switch to the raw water state, the water passing through the main flow path 3 flows into the gap between the groove-shaped flow path 15 and the downstream end face of the movable tube 7 and pushes the deposit. Thus, the liquid agent flow path near the ejector portion can be washed.
Furthermore, at this time, water also flows into the space that has formed the liquid agent flow path 4 between the groove-like flow path 15 and the liquid agent pipe 17 in the diluted state, and the inner surface of the downstream side pipe 8 and the movable pipe 7 The outer surface can be cleaned.

In order to prevent water from flowing back from the main flow path 3 to the upstream side of the liquid agent flow path 4 in this raw water state, a check valve shown in FIG. Is provided.
The check valve includes a valve seat 18 provided in the liquid agent flow path 4, a check valve body 19 disposed on the downstream side of the valve seat 18 and having a curved surface larger than the valve seat 18, It comprises a coil spring 20 that urges the valve stop 19 to the valve seat 18.

In the diluted state in which the liquid agent is sucked into the main flow path 3, the check valve body 19 is separated from the valve seat 18 against the biasing force of the coil spring 20 due to the negative pressure, and the liquid agent can flow.
On the other hand, when water or liquid flows backward through the liquid flow path 4 in a raw water state or the like, the check valve body 19 is pressed against the valve seat 18 by water or liquid in addition to the urging force of the coil spring 20, so The flow to the side is cut off.
The check valve is not limited to this form, and any valve that allows the flow from the liquid agent channel 4 to the main channel 3 and prevents the reverse flow of water or the liquid agent to the liquid agent channel 4 can be used.

In the liquid agent diluting device 1 of the first embodiment, when the movable tube 7 is separated from the downstream tube 8 as shown in FIG. 2B, the liquid agent flow channel in the vicinity of the ejector portion 12 is caused by water passing through the main flow channel 3. By washing 4, it is possible to automatically prevent clogging of the liquid agent flow path 4 due to small dust or components deposited from the liquid agent.
Further, the liquid agent channel 4 and the narrowing portion 16 for adjusting the flow rate are narrow and difficult to clean, but the groove-like channel 15 of the first embodiment has a shape in which the channel is broken during cleaning, and the groove-like channel Since a large space is formed in the vicinity of the path 15, the cleaning performance can be improved.

Further, when the movable tube 7 is separated from the downstream side tube 8, the liquid agent is not introduced into the main flow channel 3, and the water enters a raw water state through which the main flow channel 3 is passed. The liquid agent flow path 4 in the vicinity of the ejector section 12 can be automatically washed every time switching from the diluted state to the raw water state. For this reason, even if a user does not care about washing | cleaning of the liquid agent flow path 4 regularly, the liquid agent flow path 4 can be wash | cleaned in normal use.
Further, since the cleaning is performed in the raw water state instead of the diluted state, there is no possibility of affecting the dilution rate and quality of the diluted water in the diluted state.

Furthermore, in the liquid agent flow path 4, by providing a check valve upstream from the mating surface of the downstream pipe 8 and the movable pipe 7, water to the liquid supply source (for example, a tank containing the liquid agent) or the like The back flow of the liquid agent can be prevented.
Further, in order to form the constricted portion 16 for adjusting the flow rate of the liquid agent, it is only necessary to form a groove on the mating surface of the downstream side tube 8, so that it is easier than in the case where the constricted portion is provided in the tube as in the past. Can be manufactured.
Furthermore, in order to provide the constricted part of the liquid agent flow path 4 as a tubular member as in the prior art, the shape of the mold is an elongated tube shape, so that the mold was easily damaged, but the liquid agent dilution of the first embodiment In the apparatus 1, since the constricted portion 16 is provided in the groove-like flow path 15, the mold has a minute convex shape and can be made less painful.

<Second embodiment>
As shown in FIG. 7 (b), the liquid agent dilution apparatus 1 according to the second embodiment of the present invention branches from the main flow path 3 when the movable tube 7 is separated from the downstream tube 8, and the movable tube 7. The cleaning bypass flow path 21 is formed, which flows into the gap between the mating surfaces of the pipe and the downstream pipe 8 and merges with the main flow path 3 along the mating surfaces.
In addition, about the structure which is not demonstrated especially in the following, it is the same as that of 1st embodiment.

  In the second embodiment, a part of the outer peripheral surface on the downstream side of the movable tube 7 is formed with a smaller diameter than the upstream side. In accordance with this, the inner shape of the downstream pipe 8 is also a multi-stage shape including a diffusion portion 14, a portion circumscribing the small diameter portion of the movable tube 7, and a portion contacting the large diameter portion of the movable tube 7. It has become.

In the small diameter portion of the movable tube 7, two bypass ports 22 are opened at positions above and below the peripheral surface.
An O-ring 9 a is externally fitted at a position downstream from the bypass port 22 and upstream from the liquid agent flow path 4. Further, when the O-ring 9b is externally fitted to the position of the large-diameter portion upstream from the bypass port 22, water cannot flow out of the bypass port 22 when the O-rings 9a and 9b are in contact with the downstream pipe 8. (FIG. 7A).
Further, similarly to the first embodiment, an O-ring 9c for preventing water leakage is externally fitted to the movable tube 7 at a position upstream of the operation member 10 (see FIG. 1).

As shown in FIG. 7A, also in the second embodiment, in the diluted state in which the mating surfaces of the movable tube 7 and the downstream tube 8 are brought into contact with each other, the liquid agent is caused by the negative pressure of the water passing through the ejector portion 12. The liquid agent is sucked from the flow path 4, and dilution water having a predetermined dilution ratio can be obtained.
At this time, the O-rings 9a and 9b are in contact with the downstream pipe upstream and downstream of the bypass port 22 to block outflow of water.

On the other hand, in the raw water state in which the movable tube 7 is separated from the downstream side tube 8 as shown in FIG. 7B, the liquid agent is not introduced from the liquid agent channel 4, and the water passes through the main channel 3 and flows downstream. Spill to
Furthermore, in the second embodiment, in this raw water state, the bypass port 22 and the O-ring 9a downstream from the bypass port 22 are retreated to the large diameter portion of the downstream side pipe 8, and this O-ring 9a is connected to the downstream side pipe 8 Will not abut.
Therefore, in the downstream pipe 8, a part of the water passing through the main flow path 3 flows out from the bypass port 22, passes outside the small diameter portion of the movable pipe 7, and the downstream pipe 8 and the movable pipe 7 The cleaning bypass flow path 21 that flows into the gap formed between the mating surfaces and merges with the main flow path 3 along the mating surface is formed.
The liquid agent passage 4 in the vicinity of the ejector section 12 is washed with water that passes through the washing bypass passage 21.

In the second embodiment, when the movable tube 7 is separated from the downstream tube 8 from the diluted state and the cleaning bypass channel 21 is opened, the cleaning bypass channel 21 is generated by the negative pressure generated in the ejector portion 12. The water passing through is sucked into the main flow path 3. Therefore, even if the gap between the downstream pipe 8 and the movable pipe 7 is small compared to the first embodiment, it is possible to switch to the raw water state in which the liquid agent is not introduced.
Therefore, the operation amount of the operation member 10 required for switching from the diluted state to the raw water state can be further reduced.

  Further, since the amount of water flowing through the gap between the mating surfaces of the downstream side pipe 8 and the movable pipe 7 in the raw water state, the cleaning performance can be improved as compared with the first embodiment.

  As a modification of the second embodiment, in the raw water state, the main flow path 3 between the bypass port 22 and the ejector portion 12 is closed by a device such as an on-off valve, and all of the water supplied to the main flow path 3 is You may make it pass the washing | cleaning bypass flow path 21, wash | clean the liquid agent flow path 4 near the ejector part 12, and may join the ejector part 12. FIG.

DESCRIPTION OF SYMBOLS 1 Liquid agent dilution apparatus 2 Use apparatus 3 Main flow path 4 Liquid agent flow path 5 Liquid agent tank 6 Upstream side pipe 7 Movable pipe 7a Male thread part 8 Downstream side pipes 9a, 9b, 9c O-ring 10 Operation member 10a Lever 11 Joint rotation prevention member 12 Ejector section 13 Venturi section 14 Diffusion section 15 Groove-shaped flow path 16 Narrow section 17 Liquid agent pipe 18 Valve seat 19 Check valve body 20 Coil spring 21 Bypass flow path for cleaning 22 Bypass port

Claims (4)

A main flow path for passing water;
A flow path that merges with the main flow path, and a liquid flow path that introduces the liquid into the main flow path,
In the liquid agent diluting device provided with an ejector part for sucking the liquid agent from the liquid agent flow path by the negative pressure of water passing through the main flow path at the junction of the main flow path and the liquid agent flow path,
The liquid agent flow path connected to and / or in the vicinity of the ejector portion is formed between the mating surfaces of the two liquid agent flow path dividing members that can approach and separate from each other.
When one of the liquid channel dividing members is separated from the other, the liquid channel that is connected to and / or arranged in the vicinity of the ejector portion by water passing through the main channel is washed , and The negative pressure is reduced by separating one of the liquid agent flow path dividing members from the other, so that the liquid agent is not introduced into the main flow path and water is in a raw water state that passes through the main flow path. Liquid solution diluting device. By separating the one of the liquid flow path dividing member relative to the other, all or part of the water is branched from the main channel, is formed between the mating surfaces of two of said liquid flow path dividing member flows into the gap, liquid dilution device according to claim 1, characterized in that cleaning bypass passage merging into the main flow path is formed along the mating surface. A liquid agent flow path connected to and / or in the vicinity of the ejector part is engraved on at least one of the liquid flow path dividing members between the two adhering surfaces of the two liquid agent flow path dividing members. 3. The liquid agent diluting device according to claim 1, wherein the liquid agent diluting device is formed as a groove-like channel.   A check valve for preventing a back flow of the liquid agent or the water is provided at a position upstream of the mating surface of the two liquid agent flow path dividing members in the liquid agent flow path. The liquid agent dilution apparatus in any one.

Images