JP6567579B2 - Spray nozzle unit with built-in diaphragm valve - Google Patents

Description

  The present invention relates to a spray nozzle unit for spraying chemical liquid, water, etc., and more specifically, a natural outflow (so-called bottling) when spraying of spray liquid remaining in the main body casing is stopped by incorporating a diaphragm valve functioning as a check valve. The present invention relates to a spray nozzle unit designed to prevent (falling).

  Among conventional techniques of the main spray nozzle unit, there is one shown in Patent Document 1 below. The spray nozzle unit (nozzle switching valve device) disclosed in Patent Document 1 includes a diaphragm valve (in the present invention, this is referred to as a diaphragm check valve) incorporated in a main body casing on which the spray nozzle is mounted. Thus, the flow path is shut off to prevent the dropping of the sprayed liquid while the sprayed liquid remaining inside the main casing is stopped.

  When the spray liquid is introduced into the main body casing from the second flow path formed between the inner pipe portion and the outer pipe portion, the diaphragm valve is opened by the pressure of the spray liquid. The two flow paths are connected to the first flow path, and the liquid is ejected from the spray nozzle connected to the first flow path.

  Further, when the supply of the spray liquid to the second flow path is stopped, the diaphragm valve is closed to prevent the residual liquid in the spray nozzle unit from dropping out.

JP2012-237389A

  In the spray nozzle unit (nozzle switching valve device) of Patent Document 1, a diaphragm valve is disposed at an end portion of an outer tube portion, and a part of the first flow path is disposed inside the inner tube portion, and the remaining portion. Are provided inside one end of the main casing.

  Further, one end side of the main body casing is connected to the outer periphery of the outer tube portion by changing the direction by 90 °, and a rotating head is provided on the outer periphery of the one end side, and a plurality of nozzle mounting ports provided in the rotating head are provided. Each spray nozzle is attached.

  Since it is such a structure, it is difficult for the spray nozzle unit of patent document 1 to shorten the length of a 1st flow path, and the quantity of the liquid which remains in a 1st flow path at the time of a spraying stop increases. The residual liquid in the first flow channel naturally flows out from the spray nozzle (spraying occurs) while the spraying is stopped. For this reason, the spray liquid (chemical solution, etc.) is consumed wastefully and excessive spraying to a specific location also occurs.

  In addition, when an attempt is made to add a diaphragm valve for preventing dropping of a conventional structure shown in Patent Document 1 to a spray nozzle unit without a diaphragm valve that is attached to the side surface of the injection tube, the diaphragm valve is connected to the spray nozzle. It is necessary to arrange it between the jet tube, and it becomes difficult to replace the diaphragm valve.

  Furthermore, by disposing a diaphragm valve between the spray nozzle and the nozzle tube, the distance from the nozzle tube to the spray nozzle varies, and when the existing nozzle tube is used as it is, the spraying position is deviated from the optimum position. Moreover, since the full length of a main body casing becomes long, the intensity | strength of a spray nozzle also falls.

  For this reason, it has been difficult to replace an existing spray nozzle unit that does not have a diaphragm valve while using an existing nozzle tube with one having a diaphragm valve.

  The present invention aims to improve the spray nozzle unit with a built-in non-return diaphragm valve in order to eliminate waste of spray liquid and excessive spraying to a specific location, and to improve the flow between the diaphragm valve and the spray nozzle. It is an object of the present invention to reduce the amount of residual liquid in the road, and at the same time, to make it easy to replace the diaphragm valve and to replace the existing spray nozzle unit with a spray nozzle unit equipped with a diaphragm valve.

  In order to solve the above-described problems, in the present invention, a first casing provided with a spray liquid introduction path therein, a second casing mounted on the outer periphery of the first casing, a spray liquid delivery path, When the internal pressure of the introduction path exceeds a predetermined value, the introduction path communicates with the delivery path, and when the internal pressure of the introduction path is equal to or less than a predetermined value, a diaphragm valve that disconnects the communication, and an outer periphery of the second casing A spray nozzle that is mounted and sprays the sprayed liquid flowing into the delivery path to the outside, and the delivery path is formed between the outer diameter surface of the first casing and the inner diameter surface of the second casing, A spray nozzle unit with a built-in diaphragm valve in which the volume of the delivery path is set smaller than the volume of the introduction path is provided.

  In this spray nozzle unit, the entire first casing is straight and the inlet center and the outlet center of the introduction path are on a straight axis. The entire first casing is L-shaped, and the introduction path is directed to the inlet side. Two forms of the outlet side having a shape bent by 90 ° are conceivable.

  In the spray nozzle unit of the present invention, the second casing is rotatably fitted to the first casing, and a plurality of spray nozzles are mounted on the outer periphery of the second casing at different positions in the circumferential direction. It is conceivable that a flow path switching valve for selectively communicating the delivery path with any one of the spray nozzles by rotation of the second casing is disposed between the first casing and the second casing.

  Further, it is conceivable that the second casing is fixed to the outer periphery of the first casing so as not to rotate, and one spray nozzle is mounted on the second casing.

  The diaphragm valve is described in Patent Document 1, that is, a valve portion provided at the outlet of the introduction path, and a diaphragm that is held by the second casing and receives the hydraulic pressure in the introduction path on one side. The valve press provided with a guide shaft in the center of the back surface pressed against the other surface of the diaphragm, and a spring that applies a pressing force to the valve portion against the diaphragm via the valve press may be combined. .

  The diaphragm valve described in Patent Document 1 is provided with a valve cap fixed by using a union nut at the end of the outer tube portion of the main body casing, and the outer periphery of the diaphragm is defined by the valve cap and the end surface of the outer tube portion. Further, the guide shaft of the valve presser is slidably inserted into the shaft hole of the valve cap, and the spring is contracted between the valve cap and the valve presser.

  In the present invention, the diaphragm valve is detachably assembled to the end of the second casing that is externally fitted to the first casing. Specifically, a union nut is screwed onto the end portion of the second casing, and the valve cap is tightened with the union nut, and the outer periphery of the diaphragm is sandwiched between the valve cap and the end surface of the second casing. Further, a valve pressing guide shaft is inserted into the shaft hole of the valve cap, and a spring for pressing the diaphragm against the valve portion is contracted between the valve cap and the valve pressing.

  In the spray nozzle unit of the present invention, the delivery path is formed between the outer diameter surface of the first casing and the inner diameter surface of the second casing fitted on the first casing, and is arranged on the outer periphery of the introduction path. .

  Therefore, the distance from the diaphragm valve to the spray nozzle can be shortened and the volume of the delivery path can be set smaller than the volume of the introduction path.

  With this setting, it is possible to reduce the amount of residual liquid in the delivery path that is unavoidable due to the fact that it is downstream from the diaphragm valve, compared to conventional products, and waste of spray liquid or excessive spraying to specific locations. It becomes possible to reduce.

  In addition, when the spray nozzle is in the spraying posture (downward), the second casing is in a nearly horizontal posture, and the diaphragm valve is assembled at the end of the second casing. Can be performed without being obstructed by the spray nozzle, and is excellent in maintainability.

  Further, since the diaphragm valve is assembled at the end of the second casing, there is no problem of a change in the distance from the existing jet tube to the spray nozzle, and the diaphragm valve of the existing spray nozzle unit not provided with the diaphragm valve is provided. It is possible to replace the spray nozzle unit.

It is sectional drawing which shows an example of the spray nozzle unit of this invention in the state which the diaphragm valve closed. It is a disassembled perspective view of the spray nozzle unit of FIG. It is sectional drawing which shows another example of the spray nozzle unit of this invention in the state which the diaphragm valve closed. FIG. 6 is a cross-sectional view showing still another example of the spray nozzle unit of the present invention in a state in which a diaphragm valve is closed.

  Embodiments of a spray nozzle unit according to the present invention will be described below with reference to FIGS.

  The spray nozzle unit 1 shown in FIGS. 1 and 2 includes a first casing 2, a union nut 3, a second casing 4, a diaphragm valve 5, a retaining pin 6, a flow path switching valve 7, and a plurality of spray nozzles 8. It is configured in combination.

  The first casing 2 is a cylindrical casing having an outer diameter changed at several places, and has a spray liquid introduction path 9 therein.

  The union nut 3 is a fastener for connecting the first casing 2 to the injection tube 20 and is used by being engaged with a flange 2 a provided on the outer periphery of the first casing 2.

  A pipe joint 21 is attached to the jet pipe 20 in a liquid-tight manner, and the union nut 3 is screwed onto a male thread portion of the pipe joint 21 extending to the side of the jet pipe 20. In addition, the 1st casing 2 and the pipe joint 21 have the convex part 2b and the recessed part 21a which were shown in FIG. 2 in the corresponding position, By fitting the convex part 2b and the recessed part 21a mutually, pipe fitting The first casing 2 is positioned with respect to 21.

  The second casing 4 is mounted on the outer periphery of the first casing 2 so as to be rotatable and not movable in the axial direction. In order to prevent the second casing 4 from moving in the axial direction, in the illustrated spray nozzle unit 1, the retaining pin 6 with a return is inserted into the pin hole 4 c provided in the second casing 4, and the retaining pin 6 is inserted. It is made by inserting into a groove 2 c formed on the outer periphery of the first casing 2.

  The second casing 4 employed in the illustrated spray nozzle unit 1 is provided with a plurality of (three in the figure) nozzle mounting ports 4a at a constant pitch in the circumferential direction on the outer periphery. A spray nozzle 8 having a different spray pattern is attached to each.

  Each of the nozzle attachment ports 4a has a radial through hole 4b provided in the second casing 4 so as to correspond to each nozzle attachment port.

  Between the outer diameter surface of the first casing 2 and the inner diameter surface of the second casing 4, a spray liquid delivery path 10 whose volume is smaller than the volume of the introduction path 9 is created. The connection state of the delivery path 10 to the introduction path 9 is switched by the diaphragm valve 5.

  The diaphragm valve 5 includes a valve portion 5a provided at the outlet of the introduction passage 9, a diaphragm 5b that is held by the second casing 4 and receives the hydraulic pressure in the introduction passage 9, and a valve that presses against the other surface of the diaphragm. A combination of a presser 5c and a spring 5d that applies a pressing force against the valve part 5a to the diaphragm 5b via the valve presser 5c is provided.

  The valve retainer 5c has a guide shaft Ga at the center of the back surface. The illustrated valve portion 5 a is formed in the tubular piece 11 by fitting the tubular piece 11 to the end of the first casing 2 in a liquid-tight manner.

  A plurality of ribs 14 are arranged between the cylindrical piece 11 and the inner diameter surface of the second casing 4 with a gap in the circumferential direction. The rib 14 is integrally formed on the inner diameter surface of the second casing 4, but may be formed on the outer diameter surface of the cylindrical piece 11 as shown in FIG. 3. The rib 14 also serves to reduce the volume of the delivery path 10.

  The diaphragm valve 5 is provided with a valve cap 12 and sandwiches the outer periphery of the diaphragm 5b between the valve cap 12 and the end surface of the second casing 4 so as to ensure an airtight state. The valve cap 12 is fixed to the end of the second casing 4 using a union nut 13.

  A shaft hole 12a is formed in the center of the valve cap 12. A guide shaft Ga of the valve presser 5c is slidably inserted into the shaft hole 12a, and a spring 5d is interposed between the valve cap 12 and the valve presser 5c. The diaphragm 5b is pressed and the diaphragm 5b is pressed against the valve portion 5a by the force of the spring 5d to cut off the communication between the delivery path 10 and the introduction path 9.

  When the internal pressure of the introduction path 9 received on one surface exceeds a predetermined value, the diaphragm 5b compresses the spring 5d and separates from the valve portion 5a. As a result, the introduction path 9 and the delivery path 10 communicate with each other. The introduced spray liquid flows into the delivery path 10 and is sprayed from the spray nozzle 8.

  The flow path switching valve 7 is a cylindrical valve that is mounted on the outer periphery of the first casing 2 so as not to be relatively rotatable, and has a valve hole 7a that penetrates in a radial direction at one lowermost portion of the outer periphery.

  When the second casing 4 is rotated and one of the through holes 4b moves to the installation portion of the valve hole 7a, the nozzle hole 4a provided with the through hole 4b is connected to the valve hole 7a of the second casing 4. It communicates with the inner delivery path 10. Thereby, the liquid is sprayed from the spray nozzle 8 attached to the nozzle attachment port 4 a communicating with the delivery path 10.

  The spray nozzle 8 is a known nozzle. The illustrated spray nozzle 8 is provided with a nozzle plate 8a having nozzle holes and a filter 8b for scrubbing foreign matter inside, but is not limited to the illustrated structure.

  1 and 2, 16 is an O-ring, and 17 is a seal packing, which are interposed at a place where a liquid-tight seal is necessary.

  The spray nozzle unit 1 of FIG. 1 has an existing spray without a diaphragm valve that is used by attaching a distance L (see FIG. 1) from the center of the jet tube 20 to the center of the spray nozzle 8 to the side surface of the jet tube 20. It can be the same length as the nozzle unit.

  When a diaphragm valve for preventing dropping of a conventional structure shown in Patent Document 1 is attached to an existing spray nozzle unit without a diaphragm valve attached to the side surface of a jet tube, the diaphragm valve is sprayed to the spray nozzle. 8 and the jet tube 20, and the distance from the center of the jet tube 20 to the center of the spray nozzle 8 is considerably larger than L in FIG.

  For this reason, the problem described in the section of the problem to be solved by the invention occurs, but according to the present invention, the problem is solved.

  The spray nozzle unit 1 of FIG. 1 is configured to selectively switch any one of the three spray nozzles 8 to the delivery path 10 so that the spray pattern can be switched, but is attached to the second casing 4. The number of spray nozzles may be one, and in that form, the second casing 4 is externally fitted to the first casing 2 so as not to rotate.

  As shown in FIGS. 3 and 4, the spray nozzle unit 1 of the present invention has an L shape as a whole of the first casing 2, and the introduction path 9 has a shape in which the outlet side is bent by 90 ° with respect to the inlet side. It may be.

  Further, the engagement of the union nut 3 with the first casing 2 may be performed via a joint 15 such as a bamboo shoot nipple as shown in FIGS.

  Furthermore, in the form of FIGS. 1 and 3, the valve portion 5 a is formed in a cylindrical piece 11 that is detachable with respect to the first casing 2. However, as shown in FIG. 4, the valve portion 5 a is integrated with the first casing 2. In this embodiment, the rib 14 is not necessary.

  In addition, in the illustrated spray nozzle unit, a plurality of spray nozzles 8 are mounted on the second casing 4, and any one of the plurality of spray nozzles 8 is selectively communicated with the delivery path 10 by the rotation of the second casing 4. Although it is a thing, the number of the spray nozzle 8 with which the 2nd casing 4 is mounted | worn may be one.

In the spray nozzle unit 1 having one spray nozzle 8, the flow path switching valve 7 has a plurality of valve holes 7a, and the second casing 4 rotates so that the through holes 4b have different circumferential positions. A mode in which the spraying direction is switched in communication with 7a, and a switching valve (not shown) provided in the spray liquid supply path to the spray nozzle unit 1 in which the second casing 4 is fixed to the outer periphery of the first casing 2 so as not to rotate. Two forms are possible, in which only the start and stop of spraying are switched by the above operation.
Both of these two forms are included in the application target of the present invention.

DESCRIPTION OF SYMBOLS 1 Spray nozzle unit 2 1st casing 2a Flange 2b Protruding part 2c Groove 3 Union nut 4 2nd casing 4a Nozzle attachment port 4b Through-hole 4c Pin hole 5 Diaphragm valve 5a Valve part 5b Diaphragm 5c Valve presser Ga Guide shaft 5d Spring 6 Detachment Stop pin 7 Flow path switching valve 7a Valve hole 8 Spray nozzle 8a Spray plate 8b Filter 9 Introduction path 10 Delivery path 11 Tubular piece 12 Valve cap 12a Shaft hole 13 Union nut 14 Rib 15 Joint 16 O ring 17 Seal packing 20 Jet pipe 21 Pipe joint 21a Recess

Claims (3)

  A first casing (2) having a spray liquid introduction passage (9) therein; a second casing (4) mounted on the outer periphery of the first casing (2); and the first casing (2). When the internal pressure of the spray passage (10) formed between the outer diameter surface and the inner diameter surface of the second casing (4) exceeds the predetermined value, the introduction path ( 9) is connected to the delivery path (10), and is attached to the outer circumference of the diaphragm valve (5) and the second casing (4) for disconnecting the communication when the internal pressure of the introduction path (9) is below a predetermined value. A spray nozzle (8) for ejecting the sprayed liquid flowing into the delivery path (10) to the outside, and the volume of the delivery path (10) is set smaller than the volume of the introduction path (9). Spray nozzle unit with built-in diaphragm valve.   The second casing (4) is rotatably fitted to the first casing (2), and a plurality of spray nozzles (8) are changed in the circumferential direction on the outer periphery of the second casing (4). The delivery path (10) is turned to any one of the spray nozzles (8) by rotation of the second casing (4) between the first casing (2) and the second casing (4). A spray nozzle unit having a built-in diaphragm valve according to claim 1, wherein a flow path switching valve (7) for selective communication is arranged.   The spray nozzle unit incorporating the diaphragm valve according to claim 1 or 2, wherein the diaphragm valve (5) is detachably assembled to an end of the second casing (4).

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