JP2006223945A - Washing nozzle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing nozzle constituted so as to automatically exclude foreign matter by utilizing a rise in the water sending pressure caused by clogging when the washing nozzle is clogged to eliminate the cause of the clogging of the washing nozzle. <P>SOLUTION: The washing nozzle is constituted so that the inside of an outer cylinder 11 is divided into a water guide passage 12 and a cylinder chamber 13 in a communication state, a water sending pipe (a) is connected to the water guide passage 12, a jet orifice 11d becoming a takeout orifice at the time of exclusion of foreign matter is formed to a part of the side peripheral surface of the leading end side 13a of the cylinder chamber 13, a piston 14 which varies the opening area of the jet orifice 11d is mounted in the cylinder chamber 13, a jet groove 14b is formed to the leading end surface 14a of the piston 14, a spring 16, which always exerts the piston under pressure ranging from the water pressure acting on the leading end surface 14a of the piston 14 at usual time to the water pressure raised at an abnormal time, is arranged in the cylinder chamber 13, a fixed plate 17 for supporting the spring 16 is attached to the cylinder chamber 13 and the stopper surface 11c which locks the piston 14 at the position of the minimum opening area of the jet orifice 11d is formed to the inner peripheral side of the boundary of the water guide passage 12 with the cylinder chamber 13. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cleaning nozzle that is used when attached to a subject, for example, a net type dust remover, and is used when a dust trapped by a net is ejected by dropping pressure water to a predetermined location, and in particular, The present invention relates to a cleaning nozzle that can eliminate the cause of clogging by automatically removing foreign matter by utilizing an increase in water supply pressure due to clogging when the cleaning nozzle is clogged.

Conventionally, for example, a net type dust remover or the like is installed in a channel such as a river in order to eliminate the litter that settles. In the net type dust remover, for example, a cleaning nozzle is attached and used to remove dust trapped by the net by spraying pressure cleaning water and dropping it to a predetermined location. In the cleaning nozzle used by being attached to the net type dust remover, the pressure washing water is obtained by absorbing the river water in which the net type dust remover is installed with a submersible pump or the like and feeding it under pressure.
However, the river water that absorbs water contains floating dust, and the filter removes the floating dust contained in the water absorption. However, the micro floating dust cannot be completely removed. Since the pressure washing water supplied under pressure to the nozzle sucks the fine floating dust that has not been removed by the filter at the same time, there is a problem that the washing nozzle is likely to be clogged.
Therefore, the patent applicant of the present application, when clogging occurs in the cleaning nozzle, a cleaning nozzle that can easily remove foreign matters and eliminate the cause of clogging by manually pulling and moving the slide ring of the cleaning nozzle. Invented and applied for a patent on March 5, 2001 (Japanese Patent Laid-Open No. 2002-253993).
JP 2002-253993

  However, the above-mentioned Japanese Patent Application Laid-Open No. 2002-253993 has an advantage that foreign matters can be easily removed when clogging occurs in the cleaning nozzle. However, it is necessary to manually move the slide ring of the cleaning nozzle to move it. There has been a demand for a cleaning nozzle that can automatically eliminate clogging without depending on the above.

  In view of the above-described problems, the present invention was created to solve the problems. The object of the present invention is to increase the water supply pressure due to clogging when the cleaning nozzle is clogged. It is an object of the present invention to provide a cleaning nozzle capable of eliminating clogging by automatically removing foreign matters using the nozzle.

  In order to achieve the above object, the invention according to claim 1 divides the hollow cylindrical interior of the outer cylinder into a water conduit and a cylinder chamber having a diameter larger than that of the water conduit and communicates with the inlet of the water conduit. One end of the outer cylinder that is the side of the outer cylinder is connected to a water supply pipe to which pressure washing water is pumped, and the outlet of the pressure washing water that serves as an outlet when removing foreign matter inside the hollow cylinder of the outer cylinder is connected to the outlet side of the water conduit. A piston that is formed on a part of the side peripheral surface on the front end side of the cylinder chamber, which is the boundary side of the cylinder chamber, and is slidably mounted in the cylinder chamber to change the opening area of the jet outlet, An injection groove which is smaller than the jet outlet and becomes an jet outlet at the time of jetting is formed from the central portion toward a predetermined peripheral edge, and the jet groove formed on the piston front end surface is disposed on the inner peripheral side of the jet outlet. Install the piston in the cylinder chamber and open the spout. In order to minimize the area, a spring that is constantly biased above the normal water pressure and below the rising water pressure at the time of abnormalities acting on the piston tip surface with the piston facing the tip of the cylinder chamber is placed in the cylinder chamber on the rear side of the piston. A stopper that locks the urged piston at the position of the smallest opening area of the jet outlet by installing a fixed plate that supports the spring that urges the piston on the other end of the outer cylinder that is the rear end side of the cylinder chamber The surface is formed by means formed on the inner peripheral side of the boundary between the water conduit and the cylinder chamber.

  Further, the invention of claim 2 divides the hollow cylindrical interior of the outer cylinder into a water conduit and a cylinder chamber having a diameter larger than that of the water conduit and communicates with one end of the outer cylinder serving as an inlet side of the water conduit. Is connected to a water pipe to which pressure wash water is pumped, and the outlet of the pressure wash water, which serves as an outlet when removing foreign matter inside the hollow cylinder of the outer cylinder, A piston that is formed in a state of being connected to a part of a side peripheral surface on the outflow side and the front end side of the cylinder chamber, and that slidably mounts a piston that changes the opening area of the ejection port into the cylinder chamber. In order to minimize the pressure, a spring that is constantly energized above the normal water pressure and below the rising water pressure at the time of abnormalities acting on the piston tip surface with the piston facing the tip of the cylinder chamber is placed in the cylinder chamber on the rear side of the piston. To the other end of the outer cylinder, which is the rear end A fixed plate that supports the spring that urges the ston is installed, and a stopper surface that locks the urged piston at the position of the minimum opening area of the jet outlet is formed on the inner peripheral side of the boundary between the water conduit and the cylinder chamber It consists of means.

  Further, as a preferable aspect of the first and second aspects, an annular hole is formed in the stationary platen, and the tip end side of the piston rod connected to the rear portion of the piston is made to penetrate the annular hole of the stationary platen, and the other end side of the outer cylinder. It is preferable that a manual handle for forcibly retracting the piston is attached to the end of the projecting piston rod so as to widen the opening area of the ejection port.

  In the invention of claim 4, the hollow cylindrical interior of the outer cylinder is divided into a water conduit and a cylinder chamber in communication with each other, and pressure wash water is pumped to one end of the outer cylinder that becomes the inlet side of the water conduit. Connected to the water pipe, the pressure wash water jetting port, which becomes the outlet when removing foreign matter inside the hollow cylinder of the outer cylinder, is a part of the peripheral surface on the tip side of the cylinder chamber that is the boundary between the water conduit and the cylinder chamber. A piston that is formed in a portion and is slidably mounted in the cylinder chamber to change the opening area of the jet port, and the piston is located on the boundary side with the water conduit in order to minimize the opening area of the jet port. A spring that is normally biased to the tip side of the piston, which is higher than the normal water pressure and lower than the normal rising water pressure, is placed in the cylinder chamber on the rear side of the piston and becomes the rear end side of the cylinder chamber. A spring that biases the piston is supported on the other end of the outer cylinder. A piston-shaped fixed plate is attached, and the tip end of the piston rod connected to the rear part of the piston passes through the annular hole of the fixed plate and protrudes from the other end of the outer cylinder to contact the fixed plate via the piston rod. Comprising an opening width adjusting annular plate that adjustably locks the piston opening area at the position of the desired minimum area, and is a means that is adjustably screwed to the side peripheral surface on the tip end side of the piston rod that projects. It is.

  As a preferred aspect of the present invention, it is preferable to attach a manual handle for forcibly retracting the piston to widen the opening area of the jet outlet at the tip of the protruding piston rod.

  As apparent from the above description, according to the cleaning nozzle of the first aspect of the present invention, the hollow cylindrical interior of the outer cylinder is divided into a water conduit and a cylinder chamber having a diameter larger than that of the water conduit. The one end side of the outer cylinder, which is the inlet side of the water conduit, is connected to the water supply pipe to which the pressure washing water is pumped, and the pressure washing water jet outlet that serves as an outlet when removing foreign matter inside the hollow cylinder of the outer cylinder is introduced. A piston that is formed on a part of the side peripheral surface on the tip side of the cylinder chamber that is the boundary side with the outlet side of the water channel and that has a variable opening area of the jet port is slidably mounted in the cylinder chamber. An injection groove which is smaller than the above-described injection port and serves as an injection port at the time of injection is formed on the piston front end surface facing the nozzle from the central portion to the predetermined peripheral edge, and the injection groove formed on the piston front end surface is within the injection port. Place the piston in the cylinder chamber so that it is arranged on the circumferential side A spring that is mounted and constantly energized above the normal water pressure acting on the piston tip surface with the piston facing the tip side of the cylinder chamber to minimize the opening area of the jet port and below the rising water pressure at the time of abnormality A fixed plate that supports the spring that urges the piston is attached to the other end of the outer cylinder, which is the rear end of the cylinder chamber. The stopper surface that locks in the area position is formed on the inner peripheral side of the boundary between the water guide channel and the cylinder chamber, so that when the cleaning nozzle is clogged, the water pressure acting on the piston tip surface in the cylinder chamber increases. Then, the rising water pressure acting on the piston tip surface becomes larger than the pressing force of the spring that constantly biases the piston, and the piston is pushed out by overcoming the pressing force of the spring. Move the inside of the linder chamber toward the rear end to increase the opening area of the jet nozzle, and remove the foreign matter clogged in the cleaning nozzle by the pressure of the pressure washing water pumped through the water pipe. It can be pushed out automatically and discharged. In this way, the foreign matter can be automatically removed by utilizing the water pressure that rises when the cleaning nozzle is clogged, and the cause of clogging can be automatically eliminated.

  According to the cleaning nozzle of the second aspect of the invention, the hollow cylindrical interior of the outer cylinder is divided into a water guide channel and a cylinder chamber having a diameter larger than that of the water guide channel, and is connected to the inlet side of the water guide channel. One end of the outer cylinder is connected to a water supply pipe to which pressure wash water is pumped, and the outlet of the pressure wash water that serves as an outlet when removing foreign matter inside the hollow cylinder of the outer cylinder serves as the boundary between the conduit and the cylinder chamber. Formed in a connected state on a part of the side peripheral surface on the outlet side of the water conduit and the tip end side of the cylinder chamber, and a piston that varies the opening area of the jet port is slidably mounted in the cylinder chamber, A spring that always urges the piston at the front end side of the cylinder chamber to minimize the opening area of the jet port and is normally urged above the normal water pressure and below the rising water pressure at the time of abnormalities. Placed in the side cylinder chamber and after the cylinder chamber A fixed plate that supports a spring that urges the piston is attached to the other end of the outer cylinder that is the side, and a stopper surface that locks the urged piston at the position of the minimum opening area of the outlet is provided with the water conduit and the cylinder chamber. When the cleaning nozzle is clogged, the water pressure acting on the piston tip surface in the cylinder chamber rises, and the rising water pressure acting on the piston tip surface causes the piston to move. It is larger than the pressing force of the spring that is constantly energized, pushes the piston against the spring pressing force, moves the cylinder chamber toward the rear end, and enlarges the opening area of the jet outlet for cleaning. The foreign matter clogged in the nozzle can be automatically pushed out of the jet outlet and discharged by the water pressure of the pressure washing water pumped through the water pipe. In this way, the foreign matter can be automatically removed by utilizing the water pressure that rises when the cleaning nozzle is clogged, and the cause of clogging can be automatically eliminated. In addition, since the injection groove is not formed on the piston tip surface as in the first aspect, the structure of the piston tip surface is simplified correspondingly.

  According to a third aspect of the present invention, an annular hole is formed in the stationary platen, and the tip end side of the piston rod connected to the rear part of the piston is made to pass through the annular hole of the stationary platen and project outside from the other end side of the outer cylinder. When a manual handle that forcibly retracts the piston is attached to the tip of the protruding piston rod, the handle is gripped by hand when the cleaning nozzle becomes clogged. By overcoming the urging force of the tension spring and forcibly moving the piston in the cylinder chamber of the outer cylinder toward the rear end side of the cylinder chamber through the piston rod, The piston that has closed the inner circumference can be temporarily moved from that point to maximize the opening area of the outlet, and foreign matter can be easily removed from the outlet with the largest opening area. It is possible to eliminate the cause.

  According to the cleaning nozzle of the fourth aspect of the present invention, the hollow cylindrical interior of the outer cylinder is divided into a water conduit and a cylinder chamber in communication with each other, and one end of the outer cylinder serving as the inlet side of the water conduit is pressurized. Connected to the water pipe to which the cleaning water is pumped, the outlet of the pressure cleaning water, which serves as the outlet when removing foreign matter inside the hollow cylinder of the outer cylinder, serves as the boundary side between the water conduit and the cylinder chamber. A piston that is formed on a part of the side peripheral surface of the nozzle and that is slidably mounted in the cylinder chamber so as to change the opening area of the outlet, and the piston is bounded with the water conduit so as to minimize the opening area of the outlet. A spring that is always urged above the normal water pressure acting on the piston tip surface and below the rising water pressure at the time of abnormality is arranged in the cylinder chamber on the rear side of the piston toward the tip of the cylinder chamber on the side, and the cylinder chamber Piston on the other end of the outer cylinder Attach an annular fixed plate that supports the spring to be energized, and let the tip of the piston rod connected to the rear part of the piston pass through the annular hole of the fixed plate and project outside from the other end of the outer cylinder, so that it touches the fixed plate. The piston is contacted via the piston rod, and the opening area of the orifice is adjusted to be locked at the position of the desired minimum area. As a result, when the cleaning nozzle is clogged, the water pressure acting on the piston tip surface in the cylinder chamber rises, and the rising water pressure acting on the piston tip surface constantly urges the piston. The pushing force of the spring is greater than the pushing force of the spring, and the piston is pushed out to move the cylinder chamber toward the rear end, increasing the opening area of the jet outlet and cleaning nozzle Foreign matter clogged in the, by pressure of the pressure washing water is pumped through the water pipe, it is possible to discharge automatically extruded to the outside of the spout. In this way, the foreign matter can be automatically removed by utilizing the water pressure that rises when the cleaning nozzle is clogged, and the cause of clogging can be automatically eliminated. In addition, since the injection groove is not formed on the piston tip surface as in the first aspect, the structure of the piston tip surface is simplified correspondingly. In addition, since the position of the piston front end surface can be adjusted by adjusting the opening width adjusting annular disc, the size of the injection port during normal injection can be easily adjusted to a desired size.

Further, as in claim 5, when a manual handle for forcibly retracting the piston to expand the opening area of the jet outlet is attached to the tip of the protruding piston rod, the cleaning nozzle is clogged. In some cases, the opening area of the spout is increased by grasping the handle by hand and overcoming the urging force of the tension spring and forcibly moving the piston in the cylinder chamber of the outer cylinder toward the rear end side of the cylinder chamber through the piston rod. The piston that has blocked the inner peripheral side of the injection port to minimize it can be temporarily moved from that position to maximize the opening area of the injection port, and foreign objects can be easily removed from the injection port that has the maximum opening area. This can eliminate the cause of clogging.

  Hereinafter, the present invention will be described more specifically based on the best mode for carrying out the invention described in the drawings.

[Best Mode-1]
Here, FIG. 1 (A) is a side sectional view of the cleaning nozzle at the time of injection, FIG. 1 (B) is a view taken along arrow B-B in FIG. 1 (A), and FIG. 1 (C) is FIG. FIG. 2 is a side sectional view of the cleaning nozzle when foreign matter is removed, FIG. 3A is a side sectional view of the outer cylinder, and FIG. 3B is a side sectional view of the piston and piston rod. 3 (C) is a front view of the piston front end surface, FIG. 3 (D) is a side sectional view of the spring, FIG. 3 (E) is a side sectional view of the stationary platen, and FIG. 3 (F) is a side view of the handle.

  1 to 3, the cleaning nozzle 1 is used by being attached to, for example, a net-type dust remover (not shown), in order to remove the dust trapped by the net by spraying pressure-washing water and dropping it to a predetermined location. The outer cylinder 11, the piston 14 slidably mounted in the cylinder chamber 13 inside the outer cylinder 11, the spring 16 that urges the piston 14 toward the tip side 13 a of the cylinder chamber 13, It is mainly composed of a fixed platen 17 attached to the other end 11b of the outer cylinder 11.

  The outer cylinder 11 is divided into a hollow cylindrical interior in communication with a water conduit 12 and a cylinder chamber 13 having a diameter larger than that of the water conduit 12. One end side 11a of the outer cylinder 11 serving as an end portion on the water conduit 12 side and the other end side 11b serving as an end portion on the cylinder chamber 13 side are opened. The outer cylinder 11 has a cylindrical outer shape.

  The water conduit 12 is a passage through which the cleaning water just before being sprayed from the cleaning nozzle 1 is pumped, and the internal cross section has, for example, a circular shape. One end side of the water conduit 12 is an inlet side 12a, and the other end side is an outlet side 12b. The inlet side 12a of the water conduit 12 is the one end side 11a of the outer cylinder 11, and the one end side 11a of the outer cylinder 11 serving as the inlet side 12a is on the side peripheral surface of the water supply pipe a to which pressure wash water is pumped. Open connection.

  The pressure washing water fed through the water feeding pipe a is pumped into the water guiding path 12 from the inlet side 12a of the water guiding path 12 serving as the one end side 11a of the outer cylinder 11, and from the injection groove 14b of the piston front end surface 14a to the cylinder chamber 13. The structure is such that the fuel is injected from the injection port 15 formed by a part of the stopper surface 11c and the injection groove 14b through the injection port 11d having a minimum area by the biasing of the piston 14 on the side peripheral surface.

  The cylinder chamber 13 is formed in a circular cross-sectional shape having a diameter larger than that of the water conduit 12, for example, and the tip side 13 a of the cylinder chamber 13 that is a boundary side with the outlet side 12 b of the water conduit 12 has an inner diameter thereof. Is larger in steps. The outflow side 12b of the water conduit 12 on the boundary side and the tip side 13a of the cylinder chamber 13 are in communication.

  A stopper surface 11c that forms a stepped annular surface orthogonal to the inner peripheral surface of the cylinder chamber 13 is formed on the annular inner peripheral side of the tip end side 13a of the cylinder chamber 13 that is enlarged in a step shape. That is, the stopper surface 11 c is formed in parallel with the cut surface of the cylinder chamber 13. The stopper surface 11c is formed in an annular shape along the circumferential edge of the end portion on the outlet side 12b of the water conduit 12, and the surface is formed in an annular flat surface. The stopper surface 11c functions to lock the piston 14 by contacting the peripheral side of the piston tip surface 14a of the piston 14 biased toward the tip side.

  The stopper surface 11c locks the piston 14 and cooperates with an injection groove 14b formed in a part of the piston tip surface 14a to form an injection port 15. For example, when the injection port 15 has a square shape consisting of four sides, the injection grooves 14b form the three sides of the injection port 15, and the remaining one side forms part of the stopper surface 11c.

  A jet outlet 11d is formed in a part of the side peripheral surface of the tip end side 13a of the cylinder chamber 13 in contact with the boundary side of the water conduit 12 with the outlet side 12b. The jet outlet 11d is an opening hole through which the pressure wash water immediately before being jetted from the jet port 15 passes. The pressure wash water that has passed through the jet outlet 11d is jetted from the jet port 15 narrower than this to the outside.

  The spout 11d is also used as an outlet for removing foreign matter when the foreign matter is clogged inside the outer cylinder 11. For this reason, the spout 11d is formed in an opening hole having a size that allows foreign substances clogged inside the outer cylinder 11 to be easily taken out. The width of the ejection port 11d is wider than the maximum width of the ejection groove 14b, and the length is, for example, 10 mm.

  The piston 14 makes the jet outlet 11d have a minimum opening area at the time of injection in order to inject pressure washing water from the injection port 15, and foreign substances clogged in the water conduit 12 of the outer cylinder 11 when the washing nozzle 1 is clogged. In order to remove, the ejection port 11d can be changed to the maximum opening area at the time of foreign object removal.

  The piston 14 has a cylindrical shape, and the circular outer diameter of the piston 14 is substantially the same as the inner diameter of the cylinder chamber 13 and is slidably mounted in the cylinder chamber 13. A piston tip surface 14a is formed at the tip of the piston 14, an injection groove 14b is formed in the piston tip surface 14a, and a piston rod 14c extending rearward is connected to the rear portion of the piston 14. The front end side of the piston rod 14c extending rearward penetrates the stationary platen 17 on the other end side 11b of the outer cylinder 11 which is the rear end side of the cylinder chamber 13, and protrudes to the outside. A guide groove 14d is formed in a part of the side peripheral surface of the intermediate portion of the piston rod 14c sliding in the cylinder chamber 13 in the length direction.

  A piston tip surface 14a, which is the tip of the piston 14, is formed as a flat surface, and an injection groove 14b is formed in a part thereof. The injection groove 14b is formed from the central portion of the piston tip surface 14a toward a predetermined peripheral edge. That is, the injection groove 14b formed in the piston front end surface 14a of the piston 14 slidably mounted in the cylinder chamber 13 is mounted so as to be positioned inside the ejection port 11d. The ejection groove 14b moves in the front-rear direction along the length direction of the ejection port 11d when the piston 14 slides.

  The piston 14 is slidably mounted in the cylinder chamber 13 so that the opening area in the length direction of the ejection port 11d is variable. That is, when the foreign matter is removed, the piston 14 is moved from the front end side 13a toward the rear side in the cylinder chamber 13 to maximize the opening area of the ejection port 11d. At the time of injection, the piston 14 is moved to the front end of the cylinder chamber 13 by the spring 16 described later. The piston tip surface 14a moves to the side 13a and the peripheral edge side of the piston tip surface 14a abuts on the stopper surface 11c having an annular flat surface to make the opening area of the injection port 11d the same as the injection port 15 having the same size as the minimum injection groove 14b. .

  The injection groove 14b is formed from the center of the piston front end surface 14a toward the lower outer peripheral edge in the drawing. For example, the upper side of the central portion is formed in an arc shape, and the groove widths on both sides thereof are directed toward the lower outer peripheral edge. It expands on both sides at an angle of 30 degrees.

  Moreover, the groove depth of the injection groove 14b is 3 mm, for example, and this groove depth becomes the minimum opening area of the outlet 11d at the time of injection. That is, at the time of injection, the piston front end surface 14a in which the injection groove 14b is formed is in contact with the stopper surface 11c having an annular flat surface at the peripheral side, and the pressure washing water pumped through the water guide passage 12 of the outer cylinder 11 is injected. The fuel is ejected vigorously from the ejection port 15 of the ejection groove 14b having a narrower groove depth through the outlet 11d.

  The spring 16 serves to constantly urge the piston 14 toward the tip end side 13a of the cylinder chamber 13 to minimize the opening cross section of the ejection port 11d. For example, a coil spring is used. The spring 16 is spirally inserted into an annular space portion on the outer periphery of the piston rod 14 c of the cylinder chamber 13 on the rear side of the piston 14.

  The spring 16 constantly urges the piston 14 toward the tip end side 13a of the cylinder chamber 13. However, in the present invention, when the water feed pressure in the water guide passage 12 rises due to foreign matter clogging in the water guide passage 12, the rising pressure is increased. Thus, the piston 14 overcomes the spring pressure of the spring 16 and moves to the spring 16 side.

  For this reason, the spring 16 is required to have a spring strength (spring coefficient) sufficient to press the piston tip surface 14a of the piston 14 against the stopper surface 11c over the water pressure acting on the piston tip surface 14a during normal injection. On the other hand, the spring 16 loses the rising water pressure acting on the piston tip surface 14a when the water supply pressure rises due to the clogging of foreign matter in the water conduit 12, and the piston tip surface 14a of the piston 14 stops the stopper surface 11c. The spring strength (spring coefficient) is required to allow the piston 14 pressed against to move backward.

  When the normal water pressure acting on the piston tip surface 14a is P1, the abnormally rising water pressure acting on the piston tip surface 14a is P2, and the spring strength (spring coefficient) of the spring 16 is K, the spring 16 has its spring strength. The length (spring coefficient) is in the range of P1 <K <P2. In other words, the spring strength (spring coefficient) of the spring 16 to be used is a strength higher than the normal water pressure acting on the piston tip surface 14a of the piston 14 and also a strength lower than the rising water pressure at the time of abnormality. Is required.

  The outer periphery of the outer cylinder 11 connected to the side surface of the water pipe a is a male screw 11e spirally threaded on the cylindrical outer periphery of the one end side 11a. A part of the side surface of the water pipe a is screwed in and connected. Since the outer periphery of the one end side 11a of the outer cylinder 11 is a male screw 11e, it can be easily screwed and connected to the side peripheral surface of the water pipe a.

  An air inlet / outlet hole 11f is formed on the side circumferential surface of the cylinder chamber 13 on the side where the piston rod 14c and the spring 16 are inserted. When the piston 14 moves while sliding back and forth, the air inlet / outlet hole 11f is sealed so that the inside of the cylinder chamber 13 on the rear side of the piston 14 is sealed so that the internal air does not become a sliding resistance. It is a hole for making it communicate with.

  A fixed platen 17 that supports the rear end of the spring 16 is attached to the opening of the other end side 11 b of the outer cylinder 11 that is the rear end side of the cylinder chamber 13. The fixed platen 17 is attached in a state where the front half side is inserted into the opening of the other end side 11b. The front half side of the fixed platen 17 is formed in a circular cross section having substantially the same diameter as the inner diameter of the cylinder chamber 13, and the rear half side is formed in a circular cross section substantially the same as the outer diameter of the outer cylinder 11.

  A circular annular hole 17 a is formed in the center of the fixed platen 17. The diameter of the annular hole 17a is smaller than the diameter of the coiled spring 16 disposed in the cylinder chamber 13, and the coiled spring 16 is prevented from coming out of the annular hole 17a. The piston rod 14c penetrates through the annular hole 17a, and the tip side protrudes outside the fixed platen 17.

  The fixed platen 17 is inserted in the opening portion of the other end side 11 b of the outer cylinder 11 on the rear end side of the cylinder chamber 13, and the side peripheral surface of the other end side 11 b of the outer cylinder 11 The fixing screw 17b is fixedly attached to the other end side 11b of the outer cylinder 11, that is, the rear end side of the cylinder chamber 13 by this mounting screw 17b. The board 17 is structured to support the rear end of a coiled spring 16 that biases the piston 14. One end of the mounting screw 17b for fixing the fixing plate 17 is engaged with the guide groove 14d formed on the side peripheral surface of the piston rod 14c. When the tip of one mounting screw 17b is engaged in the guide groove 14d, the sliding range of the piston 14 in the front-rear direction is restricted.

  A manual handle 18 is attached to the tip of the piston rod 14 c protruding from the annular hole 17 a of the fixed platen 17. The handle 18 is a portion that is manually gripped when the piston 14 is forcibly retracted via the piston rod 14c in order to manually widen the opening area of the ejection port 11d. For example, a circular ring is used. For example, the handle 18 formed of a circular ring is attached in a state of passing through a mounting hole at the rear portion of the connecting tool 18a in which a front half portion is screwed into a connecting hole formed at the tip of the piston rod 14c. ing.

Next, the operation based on the configuration of the embodiment of the invention will be described below.
The cleaning nozzle 1 is used by being attached to, for example, a net-type dust remover (not shown), and is used for removing dust trapped by the net by spraying pressure cleaning water and dropping it to a predetermined location. The pressure washing water supplied to the washing nozzle 1 is absorbed by a submersible pump or the like from a river where a net type dust remover is installed.

  When the cleaning nozzle 1 absorbs water, coarse foreign matters contained in the water absorption are removed by a filter or the like, but minute foreign matters contained in the water absorption are not excluded by the filter or the like. There is a case where water is passed through the water guide path 12 inside the outer cylinder 11 constituting the cleaning nozzle 1 by being pumped to clog the jet outlet 11d.

  By the way, most of the jet outlet 11d formed on a part of the side peripheral surface of the tip end side 13a of the cylinder chamber 13 is usually covered by the piston 14 biased by the spring 16 on the inner peripheral side. It becomes the minimum opening area, becomes the injection port 15 having the same size as the injection groove 14b, and foreign matter in the outer cylinder 11 cannot be excluded.

  However, when the foreign matter in running water is clogged in the jet outlet 11d, the opening area of the jet outlet 11d is further reduced by the foreign matter, so that the water pressure acting on the jet groove 14b of the piston tip surface 14a increases. When the rising water pressure acting on the piston tip surface 14a becomes larger than the pressing force of the spring 16 that constantly biases the piston 14, the piston 14 is pushed out by overcoming the pressing force of the spring 16 and the inside of the cylinder chamber 13 is moved backward. Move toward the end.

  When the piston 14 starts to move backward in the cylinder chamber 13, the opening area of the ejection port 11d gradually increases. The foreign matter clogged in the narrow gap of the spout 11d is pushed out of the spout 11d by the water pressure of the pressure washing water that is pumped through the water supply pipe a by increasing the opening area of the spout 11d. Discharged.

  When the foreign matter clogged in the ejection port 11d is discharged, the water pressure that has risen in the outer cylinder 11 starts to decrease. When the urging force of the spring 16 that urges the piston 14 becomes relatively higher than the water pressure that has started to decrease pressing the piston tip surface 14a, the normal water pressure that the urging force of the spring 16 presses the piston tip surface 14a. The piston 14 is pushed and moved toward the distal end side 13a of the cylinder chamber 13 overcoming the above. The piston 14 that has moved toward the distal end side 13a of the cylinder chamber 13 is locked when the peripheral side of the piston distal end surface 14a hits a stopper surface 11c formed on the inner peripheral side of the distal end side 13a.

  When the piston 14 is locked by the stopper surface 11c, most of the inner peripheral side of the ejection port 11d is again covered with a part of the side peripheral surface of the piston 14, and the opening area is minimized. The injection groove 14b formed on the piston front end surface 14a in contact with the stopper surface 11c forms an injection port 15 having a minimum opening area together with the stopper surface 11c, and is injected vigorously from the injection port 15 having the minimum opening area. The pressure-washing water drops the dust trapped in the net and rinses it away.

  When the clogging occurs again, the above operation is repeated, and the clogging of the cleaning nozzle 1 is automatically eliminated and eliminated by using the rising water pressure.

  The clogging of the cleaning nozzle 1 can be arbitrarily eliminated by manual operation in addition to the above automatic elimination.

  When the cleaning nozzle 1 is clogged with foreign matter that has flowed into the water conduit 12 of the cleaning nozzle 1, the handle 18 attached to the tip of the piston rod 14c protruding outward from the other end 11b of the outer cylinder 11 is grasped. By pulling, the tip end side of the piston rod 14c is pulled out from the other end side 11b of the outer cylinder 11 to the outside.

At this time, the piston 14 to which the piston rod 14c is connected to the rear portion is constantly urged toward the distal end side 13a of the cylinder chamber 13 by the spring 16, so that the urging force of the spring 16 is overcome and the piston 14 is connected. The piston rod 14c is forcibly pulled toward the outside of the other end 11b of the outer cylinder 11.

  When the piston rod 14c is pulled and moved toward the other end side 11b of the outer cylinder 11, the piston 14 connected to the piston rod 14c is also integrated and interlocked with the other end side 11b of the outer cylinder 11, that is, the cylinder chamber 13. Move toward the rear end.

  When the piston 14 moves toward the other end side of the cylinder chamber 13, the opening area of the ejection port 11d gradually increases. The foreign matter clogged in the narrow gap of the spout 11d is pushed out of the spout 11d by the water pressure of the pressure washing water that is pumped through the water supply pipe a by increasing the opening area of the spout 11d. Discharged.

  When the foreign matter clogged inside the outer cylinder 11 is discharged, the piston rod 14c that overcomes the urging force of the spring 16 and is forcibly pulled out to the outside of the stationary platen 17 on the other end side 11b of the outer cylinder 11. The piston 14 and the piston rod 14c are moved toward the distal end side 13a of the cylinder chamber 13 by the biasing force of the spring 16 when the hand holding the grip 18 at the distal end is released. And the piston 14 is latched by the peripheral side of the piston front end surface 14a of the piston 14 coming into contact with the stopper surface 11c formed on the annular inner peripheral side of the front end side 13a of the cylinder chamber 13.

When the piston 14 is locked by the stopper surface 11c, most of the inner peripheral side of the ejection port 11d is again covered by the side peripheral surface of the piston 14, and the opening area is minimized. The injection groove 14b formed on the piston front end surface 14a in contact with the stopper surface 11c forms an injection port 15 having a minimum opening area together with the stopper surface 11c, and is injected vigorously from the injection port 15 having the minimum opening area. The pressure washing water drops the dust trapped in the net and rinses it away.

[Best Mode-2]
4A is a side sectional view of the cleaning nozzle at the time of injection, FIG. 4B is a view taken along the line BB in FIG. 4A, and FIG. 4C is the view in FIG. CC arrow view, FIG. 5 is a side sectional view of the cleaning nozzle when foreign matter is excluded, FIG. 6 (A) is a side sectional view of the outer cylinder, and FIG. 6 (B) is a side sectional view of the piston and piston rod. 6 (C) is a side sectional view of the spring, FIG. 6 (D) is a side sectional view of the stationary platen, and FIG. 6 (E) is a side view of the handle.

  4 to 6, the cleaning nozzle 2 is used by being attached to, for example, a net-type dust remover (not shown), in order to remove the dust trapped by the net by spraying pressure cleaning water and dropping it to a predetermined location. An outer cylinder 21, a piston 24 slidably mounted in a cylinder chamber 23 inside the outer cylinder 21, a spring 26 that biases the piston 24 toward the distal end side 23 a of the cylinder chamber 23; It is mainly composed of a fixed platen 27 attached to the other end 21b of the outer cylinder 21.

  The outer cylinder 21 is divided into a hollow cylindrical interior in communication with a water conduit 22 and a cylinder chamber 23 having a diameter larger than that of the water conduit 22. One end side 21a of the outer cylinder 21 serving as an end portion on the water conduit 22 side and the other end side 21b serving as an end portion on the cylinder chamber 23 side are opened. The outer cylinder 21 has an outer shape that is cylindrical.

  The water conduit 22 is a passage through which the cleaning water immediately before being jetted from the cleaning nozzle 2 is pumped, and has an internal cross section having a circular shape, for example. One end side of the water conduit 22 is an inlet side 22a, and the other end side is an outlet side 22b. The inlet side 22a of the water conduit 22 is the one end side 21a of the outer cylinder 21, and the one end side 21a of the outer cylinder 21 that becomes the inlet side 22a is on the side peripheral surface of the water pipe a to which pressure wash water is pumped. Open connection.

  The pressure wash water fed through the water feed pipe a is pumped into the water guide path 22 from the inlet side 22a of the water guide path 22 serving as one end side 21a of the outer cylinder 21, and from the piston front end surface 24a to the side peripheral surface of the cylinder chamber 23. The structure is such that the fuel is injected from an injection port 25 formed by a part of the outlets 21d and a part of the piston front end surface 24a through the outlet 21d having a minimum area due to the urging of the piston 24.

  The cylinder chamber 23 is formed in, for example, a circular cross-sectional shape whose diameter is larger than that of the water conduit 22, and the front end side 23 a of the cylinder chamber 23 which is a boundary side with the outlet side 22 b of the water conduit 22 has an inner diameter thereof. Is larger in steps. The outflow side 22b of the water guide path 22 on the boundary side and the front end side 23a of the cylinder chamber 23 are in communication with each other.

  A stopper surface 21c is formed on the annular inner peripheral side of the tip end side 23a of the cylinder chamber 23, which is enlarged in a stepped shape, to form a stepped partial annular surface orthogonal to the inner peripheral surface of the cylinder chamber 23 except for a part. ing. That is, the stopper surface 21 c is formed in parallel with the cut surface of the cylinder chamber 23. Further, the stopper surface 21c has a part of the jet port 21d formed on the lower side thereof, and is not completely annular, that is, a partly open type non-open type in which the part where the jet port 21d is formed is opened. It is formed in a complete partial annular surface. The stopper surface 21c is formed in a partial annular shape along the peripheral edge of the end portion on the outlet side 22b of the water conduit 22, and the surface is formed in an annular flat surface. The stopper surface 21c functions to lock the piston 24 by contacting the peripheral side of the piston front end surface 24a of the piston 24 biased toward the front end side.

  A jet port 21 d is formed on a part of the side peripheral surface between the outlet side 22 b of the water conduit 22 and the tip side 23 a of the cylinder chamber 23. The jet outlet 21 d is formed in a connected state between a part of the outlet side 22 b of the water conduit 22 and a part of the tip side 23 a of the cylinder chamber 23. Then, as will be described later, the portion of the jet outlet 21d formed in a part of the side peripheral surface of the outlet side 22b of the water conduit 22 becomes the jet outlet 25 at the time of normal injection. The jet outlet 21d is an opening hole through which the pressure washing water immediately before being jetted from the jet nozzle 25 passes, and the pressure washing water that has passed through the jet nozzle 21d is jetted from the jet nozzle 25 narrower than this to the outside.

  Further, the ejection port 21d is also used as an outlet for removing the foreign matter when the foreign matter is clogged inside the outer cylinder 21. For this reason, the spout 21d is formed in an opening hole that is large enough to allow the foreign matter clogged inside the outer cylinder 21 to be easily taken out. The jet outlet 21d has a total length of, for example, 10 mm. Among these, the length on the side of the water conduit 22 is 3 mm, and the length on the cylinder chamber 23 side is 7 mm. That is, the jet outlet 21d has a short length on the side of the water conduit 22 and a long length on the side of the cylinder chamber 23, and the portion formed on the short length of the water guide path 22 is the normal outlet 25. Become.

  The piston 24 sets the jet outlet 21d to a minimum opening area at the time of jetting in order to jet pressure washing water from the jet nozzle 25, and removes clogged foreign matter in the water conduit 22 of the outer cylinder 21 when the washing nozzle 2 is clogged. In order to remove it, the ejection port 21d can be changed to the maximum opening area at the time of foreign object removal.

  The piston 24 has a cylindrical shape, and the circular outer diameter of the piston 24 is substantially the same as the inner diameter of the cylinder chamber 23 and is slidably mounted in the cylinder chamber 23. The piston 24 has a piston front end surface 24a formed of a flat surface at the front end, and a piston rod 24b extending rearward is connected to the rear portion of the piston 24. The front end side of the piston rod 24b that extends rearward penetrates the stationary platen 27 on the other end side 21b of the outer cylinder 21 that is the rear end side of the cylinder chamber 23 and protrudes to the outside.

  The piston 24 is slidably mounted in the cylinder chamber 23 so that the opening area in the length direction of the jet outlet 21d can be changed. That is, when the foreign matter is removed, the piston 24 is moved from the front end side 23a toward the rear side in the cylinder chamber 23 to maximize the opening area of the jet outlet 21d. At the time of injection, the piston 24 is moved to the front end of the cylinder chamber 23 by the spring 26 described later. It moves to the side 23a side, and the peripheral edge side of the piston front end surface 24a abuts on the stopper surface 21c of the annular flat surface, so that the opening area of the ejection port 21d becomes the ejection port 25 of the minimum size.

  The spring 26 constantly urges the piston 24 toward the tip end side 23a of the cylinder chamber 23 to perform the function of minimizing the opening cross section of the jet outlet 21d. For example, a coil spring is used. The spring 26 is spirally inserted into an annular space portion on the outer periphery of the piston rod 24 b of the cylinder chamber 23 on the rear side of the piston 24.

  The spring 26 constantly urges the piston 24 toward the distal end side 23a of the cylinder chamber 23. In the present invention, when the foreign water is clogged in the water guide passage 22 and the water supply pressure in the water guide passage 22 is increased, the rising pressure is increased. Thus, the piston 24 overcomes the spring pressure of the spring 26 and moves to the spring 26 side.

  For this reason, the spring 26 is required to have a spring strength (spring coefficient) sufficient to press the piston tip surface 24a of the piston 24 against the stopper surface 21c over the water pressure acting on the piston tip surface 24a during normal injection. On the other hand, the spring 26 loses the rising water pressure acting on the piston tip surface 24a when the water supply pressure rises due to the clogging of foreign matter in the water conduit 22, and the piston tip surface 24a of the piston 24 stops the stopper surface 21c. The spring strength (spring coefficient) is required so that the piston 24 pressed against can be moved backward.

  When the normal water pressure acting on the piston tip surface 24a is P1, the abnormally rising water pressure acting on the piston tip surface 24a is P2, and the spring strength (spring coefficient) of the spring 26 is K, the spring 26 has its spring strength. The length (spring coefficient) is in the range of P1 <K <P2. That is, the spring strength (spring coefficient) of the spring 26 to be used is a strength that is higher than the normal water pressure acting on the piston tip surface 24a of the piston 24 and that is lower than the rising water pressure at the time of abnormality. Is required.

  The outer periphery of the outer cylinder 21 connected to the side peripheral surface of the water pipe a is a male screw 21e spirally threaded on the cylindrical outer periphery of the one end side 21a. A part of the side surface of the water pipe a is screwed in and connected. Since the outer periphery of the one end side 21a of the outer cylinder 21 is a male screw 21e, it can be easily screwed and connected to the side peripheral surface of the water pipe a.

  An air inlet / outlet hole 21f is formed on the side peripheral surface of the cylinder chamber 23 on the side where the piston rod 24b and the spring 26 are inserted. When the piston 24 moves while sliding back and forth, the air inlet / outlet hole 21f is sealed so that the inside of the cylinder chamber 23 on the rear side of the piston 24 is sealed so that the internal air does not become a sliding resistance. It is a hole for making it communicate with.

  A fixed plate 27 that supports the rear end of the spring 26 is attached to the opening of the other end 21 b of the outer cylinder 21 that is the rear end of the cylinder chamber 23. The stationary platen 27 is attached in a state where the front half side is inserted into the opening of the other end side 21b. The front half of the fixed plate 27 is formed in a circular cross section having the same diameter as the inner diameter of the cylinder chamber 23, and the rear half is formed in a circular cross section substantially the same as the outer diameter of the outer cylinder 21.

  A circular annular hole 27 a is formed in the center of the fixed platen 27. The diameter of the annular hole 27a is smaller than the diameter of the coiled spring 26 disposed in the cylinder chamber 23, so that the coiled spring 26 does not come out of the annular hole 27a. The piston rod 24b passes through the annular hole 27a, and the tip end protrudes outside the stationary platen 27.

  The fixed platen 27 is inserted into the opening portion of the other end side 21 b of the outer cylinder 21 that is the rear end side of the cylinder chamber 23, and the side peripheral surface of the other end side 21 b of the outer cylinder 21 The fixing screw 27b is fixedly attached to the other end side 21b of the outer cylinder 21, that is, the rear end side of the cylinder chamber 23 by this attaching screw 27b. The board 27 is configured to support the rear end of a coiled spring 26 that biases the piston 24.

  A manual handle 28 is attached to the tip of the piston rod 24 b protruding from the annular hole 27 a of the fixed platen 27. The handle 28 is a portion that is gripped by hand when the piston 24 is forcibly retracted via the piston rod 24b in order to manually increase the opening area of the ejection port 21d. For example, a circular ring is used. For example, the handle 28 made of a circular ring is attached in a state where it passes through the attachment hole at the rear part of the connection tool 28a in which the front half is screwed into the connection hole formed at the tip of the piston rod 24b. ing.

Next, the operation based on the configuration of the embodiment of the invention will be described below.
The cleaning nozzle 2 is used by being attached to, for example, a net-type dust remover (not shown), and is used for removing dust trapped by the net by spraying pressure cleaning water and dropping it to a predetermined location. The pressure washing water supplied to the washing nozzle 2 is absorbed by a submersible pump or the like from a river where a net type dust remover is installed.

  When the washing nozzle 2 absorbs water, coarse foreign matters contained in the water absorption are removed by a filter or the like, but minute foreign matters contained in the water absorption are not excluded by the filter or the like, and the water pipe a is connected with the water absorption. There is a case where the jet port 21d is clogged by flowing in the water guide path 22 inside the outer cylinder 21 which is pumped and constitutes the cleaning nozzle 2.

  By the way, most of the jet outlet 21d formed on a part of the side peripheral surface of the tip end side 23a of the cylinder chamber 23 is usually covered by the piston 24 biased by the spring 26. The minimum opening area is the same size of the injection port 25, and foreign matter in the outer cylinder 21 cannot be excluded.

  However, if the foreign matter in running water is clogged in the jet outlet 21d, the opening area of the jet outlet 21d is further reduced by the foreign matter, so that the water pressure acting on the piston tip surface 24a increases. When the rising water pressure acting on the piston front end surface 24a becomes larger than the pressing force of the spring 26 that constantly biases the piston 24, the piston 24 is pushed out by overcoming the pressing force of the spring 26 and the inside of the cylinder chamber 23 is moved backward. Move toward the end.

  When the piston 24 starts to retreat in the cylinder chamber 23, the opening area of the jet port 21d gradually increases. The foreign matter clogged in the narrow gap of the jet outlet 21d is pushed out of the jet outlet 21d by the pressure of the pressure washing water that is pumped through the water supply pipe a by increasing the opening area of the jet outlet 21d. Discharged.

  When the foreign matter clogged in the jet outlet 21d is discharged, the water pressure that has risen in the outer cylinder 21 starts to decrease. When the urging force of the spring 26 that urges the piston 24 becomes relatively higher than the water pressure that starts to decrease pressing the piston tip surface 24a, the normal water pressure that the urging force of the spring 26 presses the piston tip surface 24a is used. The piston 24 is pushed and moved toward the front end side 23a of the cylinder chamber 23 overcoming the above. The piston 24 that has moved toward the distal end side 23a of the cylinder chamber 23 is locked when the peripheral side of the piston distal end surface 24a hits a stopper surface 21c formed on the inner peripheral side of the distal end side 23a.

  When the piston 24 is locked by the stopper surface 21c, most of the inner peripheral side of the jet port 21d is again covered by a part of the side peripheral surface of the piston 24, and the opening area is minimized. The piston tip surface 24a forms an injection port 25 having a minimum opening area together with the injection port 21d formed on the outlet side 22b of the water conduit 22, and the pressure that is vigorously injected from the injection port 25 having the minimum opening area. Washing water is washed by dropping the dust trapped in the net.

  When the clogging occurs again, the above operation is repeated, and the clogging of the cleaning nozzle 2 is automatically eliminated by using the rising water pressure and eliminated.

  The clogging of the cleaning nozzle 2 can be arbitrarily eliminated by a manual operation in addition to the above automatic elimination.

  When the cleaning nozzle 2 is clogged with foreign matter that has flowed into the water conduit 22 of the cleaning nozzle 2, the handle 28 attached to the tip of the piston rod 24 b protruding from the other end 21 b of the outer cylinder 21 to the outside is held. By pulling, the tip end side of the piston rod 24b is pulled out from the other end side 21b of the outer cylinder 21 to the outside and moved.

At this time, since the piston 24 having the piston rod 24b connected to the rear portion is always urged by the spring 26 toward the distal end side 23a of the cylinder chamber 23, the piston 24 is connected by overcoming the urging force of the spring 26. The piston rod 24b is forcibly pulled toward the outside of the other end 21b of the outer cylinder 21.

  When the piston rod 24 b is pulled and moved toward the other end 21 b of the outer cylinder 21, the piston 24 connected to the piston rod 24 b is also integrated and interlocked with the other end 21 b of the outer cylinder 21, that is, the cylinder chamber 23. Move toward the rear end.

  When the piston 24 moves toward the other end side of the cylinder chamber 23, the opening area of the jet outlet 21d gradually increases. The foreign matter clogged in the narrow gap of the jet outlet 21d is pushed out of the jet outlet 21d by the pressure of the pressure washing water that is pumped through the water supply pipe a by increasing the opening area of the jet outlet 21d. Discharged.

  When the foreign matter clogged in the outer cylinder 21 is discharged, the piston rod 24b that has overcome the urging force of the spring 26 and is forcibly pulled out to the outside of the stationary platen 27 on the other end side 21b of the outer cylinder 21. The piston 24 and the piston rod 24 b are moved toward the distal end side 23 a of the cylinder chamber 23 by the urging force of the spring 26 when the hand holding the grip 28 at the distal end is released. And the piston 24 is locked by the peripheral side of the piston front end surface 24 a of the piston 24 coming into contact with the stopper surface 21 c formed on the annular inner peripheral side of the front end side 23 a of the cylinder chamber 23.

When the piston 24 is locked by the stopper surface 21c, most of the inner peripheral side of the jet port 21d is again covered by the side peripheral surface of the piston 24, and the opening area is minimized. The piston tip surface 24a forms an injection port 25 having a minimum opening area together with the injection port 21d formed on the outlet side 22b of the water conduit 22, and the pressure that is vigorously injected from the injection port 25 having the minimum opening area. The washing water is washed by dropping the dust trapped in the net.

[Best Mode-3]
7A is a side sectional view of the cleaning nozzle at the time of injection, FIG. 7B is a view taken along the line BB in FIG. 7A, and FIG. 7C is the view in FIG. CC arrow view, FIG. 8 is a side sectional view of the cleaning nozzle when removing foreign matter, FIG. 9A is a side sectional view of the outer cylinder, FIG. 9B is a side sectional view of the piston and piston rod, FIG. 9 (C) is a side sectional view of the spring, FIG. 9 (D) is a side sectional view of the fixed platen, FIG. 9 (E) is a side sectional view of the opening width adjusting annular plate, and FIG. 3 (9) is a side view of the handle. It is.

  7 to 9, the cleaning nozzle 3 is used by being attached to, for example, a net-type dust remover (not shown), in order to remove the dust trapped by the net by spraying pressure-washing water and dropping it to a predetermined location. An outer cylinder 31, a piston 34 slidably mounted in a cylinder chamber 33 inside the outer cylinder 31, a spring 36 that biases the piston 34 toward the distal end side 33 a of the cylinder chamber 33, It is mainly composed of a fixed plate 37 attached to the other end 31b of the outer cylinder 31, an opening width adjusting annular plate 39 screwed to the protruding tip side of the piston rod 34b, and the like.

  The outer cylinder 31 is divided into a hollow cylindrical interior in communication with a water conduit 32 and a cylinder chamber 33 having a diameter larger than that of the water conduit 32. One end side 31a of the outer cylinder 31 serving as an end portion on the water conduit 32 side and the other end side 31b serving as an end portion on the cylinder chamber 33 side are opened. The outer cylinder 31 has a cylindrical outer shape.

  The water conduit 32 is a passage through which the cleaning water just before being sprayed from the cleaning nozzle 3 is pumped, and has an internal cross section having a circular shape, for example. One end side of the water conduit 32 is an inlet side 32a, and the other end side is an outlet side 32b. The inlet side 32a of the water conduit 32 is the one end side 31a of the outer cylinder 31, and the one end side 31a of the outer cylinder 31 serving as the inlet side 32a is on the side peripheral surface of the water pipe a to which pressure wash water is pumped. Open connection.

  The pressure wash water fed through the water feed pipe a is pumped into the water guide channel 32 from the inlet 32 a of the water guide channel 32, which is the one end side 31 a of the outer cylinder 31, and from the piston tip surface 34 a to the side circumferential surface of the cylinder chamber 33. The front surface is formed by a part of the stepped annular surface 31c, the rear surface is formed by a part of the piston front end surface 34a, and the left and right widths are partly passed through the ejection port 31d having a minimum area due to the bias of the piston 34. It has a structure in which it is ejected from an ejection port 35 formed with the left-right width of the ejection port 31d.

  The cylinder chamber 33 is formed in the shape of a circular cross section having a diameter larger than that of the water conduit 32, for example, and the distal end side 33a of the cylinder chamber 33 which is the boundary side with the outlet side 32b of the water conduit 32 has an inner diameter thereof. Is larger in steps. The outflow side 32b of the water conduit 32 on the boundary side and the tip side 33a of the cylinder chamber 33 are in communication.

  A stepped annular surface 31 c that is orthogonal to the inner peripheral surface of the cylinder chamber 33 is formed on the annular inner peripheral side of the tip end side 33 a of the cylinder chamber 33 that has increased in a stepped shape. That is, the step annular surface 31 c is formed in parallel to the cut surface of the cylinder chamber 33. The step annular surface 31 c is formed in an annular shape along the circumferential edge of the end portion on the outlet side 32 b of the water conduit 32, and the surface is formed in an annular flat surface.

  The step annular surface 31c forms an injection port 35 in cooperation with a part of the piston front end surface 34a and a part of the left and right width of the injection port 31d. For example, when the injection port 35 has a square shape consisting of four sides, a part of the step annular surface 31c forms the front surface, a part of the piston tip surface 34a forms the rear surface, and a part of the injection port 31d has a lateral width. To do.

  A jet outlet 31d is formed in a part of the side peripheral surface of the tip end side 33a of the cylinder chamber 33 in contact with the boundary side of the water conduit 32 with the outlet side 32b. The jet outlet 31d is an opening hole through which the pressure washing water just before being jetted from the jet opening 35 passes, and the pressure washing water that has passed through the jet outlet 31d is jetted to the outside from the jet nozzle 35 narrower than this.

  Further, the ejection port 31d is also used as an outlet for removing foreign matter when foreign matter is clogged inside the outer cylinder 31. For this reason, the spout 31d is formed in an opening hole having a size that allows foreign substances clogged inside the outer cylinder 31 to be easily taken out. The length of the ejection port 31d is, for example, 10 mm.

  The piston 34 makes the jet outlet 31d have a minimum opening area at the time of jetting in order to jet pressure washing water from the jetting port 35, and removes clogged foreign matter in the water conduit 32 of the outer cylinder 31 when the washing nozzle 3 is clogged. In order to remove, the ejection port 31d can be changed to the maximum opening area at the time of foreign object removal.

  The piston 34 has a cylindrical shape, and the circular outer diameter of the piston 34 is substantially the same as the inner diameter of the cylinder chamber 33 and is slidably mounted in the cylinder chamber 33. The piston 34 has a piston front end surface 34 a formed of a flat surface at the front end, and a piston rod 34 b extending rearward is connected to the rear portion of the piston 34.

  The front end side of the piston rod 34b extending backward penetrates through the stationary platen 37 on the other end side 31b of the outer cylinder 31 that is the rear end side of the cylinder chamber 33 and protrudes to the outside. A screw-shaped thread is engraved on the circular peripheral surface on the front end side of the piston rod 34b that passes through the fixed plate 37 and protrudes to the outside so that the opening width adjusting annular plate 39 is screwed in an adjustable manner. It is a male screw 34c.

  The piston 34 is slidably mounted in the cylinder chamber 33 so that the opening area of the jet port 31d in the length direction can be changed. That is, when the foreign matter is removed, the piston 34 is moved from the distal end side 33a to the rear side in the cylinder chamber 33 to maximize the opening area of the ejection port 31d. It moves to the side 33a side, and the front surface of the opening width adjusting annular disk 39 comes into contact with the rear surface of the fixed disk 37 so that the opening area of the injection port 31d becomes the injection port 35 of the minimum size.

  The spring 36 constantly urges the piston 34 toward the tip end side 33a of the cylinder chamber 33 to perform the function of minimizing the opening cross section of the ejection port 31d. For example, a coil spring is used. The spring 36 is spirally inserted into an annular space portion on the outer periphery of the piston rod 34 b of the cylinder chamber 33 on the rear side of the piston 34.

  The spring 36 constantly urges the piston 34 toward the tip end side 33a of the cylinder chamber 33. In the present invention, when the foreign water is clogged in the water guide passage 32 and the water supply pressure in the water guide passage 32 rises, the rising pressure is increased. As a result, the piston 34 overcomes the spring pressure of the spring 36 and moves to the spring 36 side.

  For this reason, the spring 36 has an opening width adjusting annular disc that is screwed to the male screw 34c on the front end side of the piston rod 34b that is connected to the rear portion of the piston 34 over the hydraulic pressure acting on the piston front end surface 34a during normal injection. The spring strength (spring coefficient) is required to press the front surface of 39 against the rear surface of the fixed plate 37. On the other hand, the spring 36 loses the rising water pressure acting on the piston tip surface 34a when the water supply pressure rises due to the clogging of foreign matter in the water guide channel 32, and the tip of the piston rod 34b connected to the piston 34. The spring strength (spring coefficient) is required so that the piston 34 that presses the front surface of the opening width adjusting annular disk 39 screwed to the side against the rear surface of the fixed disk 37 can be retracted.

  When the normal water pressure acting on the piston tip surface 34a is P1, the abnormal rising water pressure acting on the piston tip surface 34a is P2, and the spring strength (spring coefficient) of the spring 36 is K, the spring 36 has its spring strength. The length (spring coefficient) is in the range of P1 <K <P2. That is, the spring strength (spring coefficient) of the spring 36 to be used is a strength higher than the normal water pressure acting on the piston tip surface 34a of the piston 34, and is also a strength lower than the rising water pressure at the time of abnormality. Is required.

  The outer periphery of the outer cylinder 31 connected to the side peripheral surface of the water pipe a is a male screw 31e spirally engraved on the cylindrical outer periphery of the one end side 31a. A part of the side surface of the water pipe a is screwed in and connected. Since the outer periphery of the one end side 31a of the outer cylinder 31 is a male screw 31e, it can be easily screwed and connected to the side peripheral surface of the water pipe a.

  An air inlet / outlet hole 31f is formed on the side circumferential surface of the cylinder chamber 33 on the side where the piston rod 34b and the spring 36 are inserted. When the piston 34 moves while sliding back and forth, the air inlet / outlet hole 31f is sealed so that the inside of the cylinder chamber 33 on the rear side of the piston 34 is sealed so that the internal air does not become a sliding resistance. It is a hole for making it communicate with.

  A fixed plate 37 that supports the rear end of the spring 36 is attached to the opening of the other end 31 b of the outer cylinder 31 that is the rear end of the cylinder chamber 33. The fixed platen 37 is attached in a state where the front half side is inserted into the opening of the other end side 31b. The first half side of the fixed plate 37 is formed in a circular cross section having substantially the same diameter as the inner diameter of the cylinder chamber 33, and the second half side is formed in a circular cross section substantially the same as the outer diameter of the outer cylinder 31.

  A circular annular hole 37 a is formed in the center of the fixed plate 37. The diameter of the annular hole 37a is smaller than the diameter of the coiled spring 36 disposed in the cylinder chamber 33, and the coiled spring 36 is prevented from coming out of the annular hole 37a. The piston rod 34 b passes through the annular hole 37 a, and the tip side protrudes outside the fixed platen 37.

  The fixed plate 37 is inserted into the opening portion of the other end side 31 b of the outer cylinder 31 on the rear end side of the cylinder chamber 33, and the side peripheral surface of the other end side 31 b of the outer cylinder 31 is disposed on the side peripheral surface of the front half side. The fixing screw 37b is fixedly attached to the other end side 31b of the outer cylinder 31, that is, the rear end side of the cylinder chamber 33 by this attaching screw 37b. The board 37 is structured to support the rear end of a coiled spring 36 that urges the piston 34.

  A manual handle 38 is attached to the tip of the piston rod 34 b protruding from the annular hole 37 a of the fixed plate 37. The handle 38 is a portion that is manually gripped when the piston 34 is forcibly retracted via the piston rod 34b in order to manually increase the opening area of the jet port 31d. For example, a circular ring is used. For example, the handle 38 made of a circular ring is attached in a state of passing through a mounting hole at the rear portion of the connecting tool 38a in which the front half is screwed into a connecting hole formed at the tip of the piston rod 34b. ing.

  The opening width adjusting annular disc 39 adjusts the clearance of the piston tip surface 34a with respect to the step annular surface 31c, and the piston 34 urged by the spring 16 at the position of the desired minimum area of the opening area of the jet port 31d. The piston rod 34b and the stationary platen 37 are locked.

  That is, the front surface of the opening width adjusting annular disc 39 screwed with the male screw 34c on the tip side of the piston rod 34b penetrating through the annular hole 37a of the fixed plate 37 abuts on the rear surface of the fixed plate 37, so that the spring 16 The piston 34, which is constantly urged toward the tip end side 33 a of the cylinder chamber 33, is locked with a desired clearance with respect to the step annular surface 31 c.

  The opening width adjusting annular disc 39 is formed with a circular female screw 39a at the center thereof. A female screw thread is formed on the inner peripheral surface of the female screw 39a so as to be engaged with the male screw 34c on the distal end side of the piston rod 34b. The opening width adjusting annular disc 39 is adjustable in the front-rear direction of the piston rod 34b while being engaged with the male screw 34c on the distal end side of the piston rod 34b. For example, a nut is used for the opening width adjusting annular disc 39.

  When the opening width adjusting annular disc 39 screwed to the male screw 34c on the front end side of the piston rod 34b is moved in a direction approaching the piston 34, the piston front end surface 34a moves in a direction away from the step annular surface 31c, and the ejection port The minimum opening area of 31d is adjusted to increase.

  On the other hand, when the opening width adjusting annular disc 39 screwed to the male screw 34c on the distal end side of the piston rod 34b is moved away from the piston 34, the piston distal end surface 34a moves in a direction approaching the step annular surface 31c. Thus, the minimum opening area of the ejection port 31d is adjusted to be reduced.

Next, the operation based on the configuration of the embodiment of the invention will be described below.
The cleaning nozzle 3 is used by being attached to, for example, a net type dust remover (not shown), and is used for removing dust trapped by the net by spraying pressure cleaning water and dropping it to a predetermined location. The pressure washing water supplied to the washing nozzle 3 is absorbed by a submersible pump or the like from a river where a net type dust remover is installed.

  When the cleaning nozzle 3 absorbs water, coarse foreign matters contained in the water absorption are removed by a filter or the like, but minute foreign matters contained in the water absorption are not excluded by the filter or the like, and the water pipe a is connected with the water absorption. The jet port 31d may be clogged by flowing in the water guide path 32 inside the outer cylinder 31 that is pumped and forms the cleaning nozzle 3.

  By the way, most of the jet outlet 31d formed on a part of the side peripheral surface of the tip end side 33a of the cylinder chamber 33 is usually covered by the piston 34 biased by the spring 36. The minimum opening area is the same size of the injection port 35, and foreign matter in the outer cylinder 31 cannot be excluded.

  However, if the foreign matter in running water is clogged in the jet outlet 31d, the opening area of the jet outlet 31d is further reduced by the foreign matter, so that the water pressure acting on the piston tip surface 34a increases. When the rising water pressure acting on the piston front end surface 34a becomes larger than the pressing force of the spring 36 that constantly biases the piston 34, the piston 34 is pushed out by overcoming the pressing force of the spring 36, and the inside of the cylinder chamber 33 is moved backward. Move toward the end.

  When the piston 34 starts to retreat in the cylinder chamber 33, the opening area of the ejection port 31d gradually increases. The foreign matter clogged in the narrow gap of the jet outlet 31d is pushed out of the jet outlet 31d by the water pressure of the pressure washing water that is pumped through the water supply pipe a by increasing the opening area of the jet outlet 31d. Discharged.

  When the foreign matter clogged in the ejection port 31d is discharged, the water pressure that has risen in the outer cylinder 31 starts to decrease. When the urging force of the spring 36 that urges the piston 34 becomes relatively higher than the water pressure that starts to decrease pressing the piston front end surface 34a, the normal water pressure that the urging force of the spring 36 presses the piston front end surface 34a. The piston 34 is pushed and moved toward the distal end side 33a of the cylinder chamber 33 overcoming the above. The piston 34 moved toward the distal end side 33 a of the cylinder chamber 33 is attached to the other end side 31 b of the outer cylinder 31 with the front surface of the opening width adjusting annular disc 39 screwed to the male screw 34 c on the distal end side of the piston rod 34 b. The fixed plate 37 is locked by hitting the rear surface.

  When the piston 34 is locked by the opening width adjusting annular disc 39, most of the inner peripheral side of the ejection port 31d is again covered with a part of the side peripheral surface of the piston 34, and the opening area is minimized. The piston front end surface 34a and the step annular surface 31c form an injection port 35 having a minimum opening area, and the pressure washing water jetted from the injection port 35 having the minimum opening area vigorously collects dust trapped in the net. Drop and wash away.

  When the clogging occurs again, the above operation is repeated, and the clogging of the cleaning nozzle 3 is automatically eliminated and eliminated by using the rising water pressure.

  The clogging of the cleaning nozzle 3 can be arbitrarily eliminated by a manual operation in addition to the above automatic elimination.

  When the cleaning nozzle 3 is clogged by foreign matter that has flowed into the water conduit 32 of the cleaning nozzle 3, the handle 38 attached to the tip of the piston rod 34 b protruding from the other end 31 b of the outer cylinder 31 to the outside is grasped. By pulling, the tip end side of the piston rod 34b is pulled out from the other end side 31b of the outer cylinder 31 to the outside and moved.

  At this time, the piston 34 to which the piston rod 34b is connected to the rear portion is always urged by the spring 36 toward the distal end side 33a of the cylinder chamber 33, so that the urging force of the spring 36 is overcome and the piston 34 is connected. The piston rod 34b is forcibly pulled toward the outside of the other end 31b of the outer cylinder 31.

  When the piston rod 34 b is pulled and moved toward the other end 31 b of the outer cylinder 31, the piston 34 connected to the piston rod 34 b is also interlocked with the other end 31 b of the outer cylinder 31, that is, the cylinder chamber 33. Move toward the rear end.

  When the piston 34 moves toward the other end side of the cylinder chamber 33, the opening area of the ejection port 31d gradually increases. The foreign matter clogged in the narrow gap of the jet outlet 31d is pushed out of the jet outlet 31d by the water pressure of the pressure washing water that is pumped through the water supply pipe a by increasing the opening area of the jet outlet 31d. Discharged.

  When the foreign matter clogged inside the outer cylinder 31 is discharged, the piston rod 34b that has overcome the urging force of the spring 36 and is forcibly pulled out to the outside of the stationary platen 37 on the other end 31b of the outer cylinder 31. The piston 34 and the piston rod 34b are moved toward the distal end side 33a of the cylinder chamber 33 by the urging force of the spring 36. The piston 34 moved toward the distal end side 33a of the cylinder chamber 33 is such that the front surface of the opening width adjusting annular disc 39 screwed with the male screw 34c on the distal end side of the piston rod 34b is the other end side 31b of the outer cylinder 31. It is locked by hitting the rear surface of the fixed platen 37 attached to.

When the piston 34 is locked by the opening width adjusting annular disc 39, most of the inner peripheral side of the ejection port 31d is again covered with a part of the side peripheral surface of the piston 34, and the opening area is minimized. The piston front end surface 34a and the step annular surface 31c form an injection port 35 having a minimum opening area, and the pressure washing water jetted from the injection port 35 having the minimum opening area vigorously collects dust trapped in the net. Drop and wash away.

  Note that the present invention is not limited to the best mode for carrying out the invention, and various modifications can be made without departing from the spirit of the invention.

(A) is a sectional side view of the cleaning nozzle at the time of jetting showing the best mode-1 for carrying out the present invention. (B) is a BB arrow line view of FIG. 1 (A). (C) is a CC arrow line view of FIG. 1 (A). It is a sectional side view of the washing nozzle at the time of the foreign material exclusion which shows the best form-1 for implementing this invention. (A) is a side sectional view of an outer cylinder showing the best mode-1 for carrying out the present invention. (B) is a side sectional view of a piston and a piston rod showing the best mode-1 for carrying out the present invention. (C) is a front view of the piston front end surface showing the best mode-1 for carrying out the present invention. (D) is a sectional side view of a spring showing the best mode-1 for carrying out the present invention. (E) is a sectional side view of a fixed plate showing the best mode-1 for carrying out the present invention. (F) is a side view of a handle showing the best mode-1 for carrying out the present invention. (A) is side sectional drawing of the washing nozzle at the time of injection which shows the best form-2 for implementing this invention. (B) is a BB arrow line view of FIG. 4 (A). (C) is CC arrow line view of FIG. 4 (A). It is side sectional drawing of the washing nozzle at the time of the foreign material exclusion which shows the best form-2 for implementing this invention. (A) is a sectional side view of an outer cylinder showing the best mode-2 for carrying out the present invention. (B) is a sectional side view of a piston and a piston rod showing the best mode-2 for carrying out the present invention. (C) is a sectional side view of a spring showing the best mode-2 for carrying out the present invention. (D) is a sectional side view of the stationary platen showing the best mode-2 for carrying out the present invention. (E) is a side view of a handle showing the best mode-2 for carrying out the present invention. (A) is side sectional drawing of the washing nozzle at the time of injection which shows the best form-3 for implementing this invention. (B) is a BB arrow line view of FIG. 7 (A). (C) is CC arrow line view of FIG. 7 (A). It is a sectional side view of the washing nozzle at the time of the foreign material exclusion which shows the best form-3 for implementing this invention. (A) is a side sectional view of an outer cylinder showing the best mode-3 for carrying out the present invention. (B) is a side sectional view of a piston and a piston rod showing the best mode-3 for carrying out the present invention. (C) is a sectional side view of a spring showing the best mode-3 for carrying out the present invention. (D) is a sectional side view of the stationary platen showing the best mode-3 for carrying out the present invention. (E) is a sectional side view of an opening width adjusting annular disc showing the best mode-3 for carrying out the present invention. (F) is a side view of a handle showing the best mode-3 for carrying out the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Washing nozzle 11 Outer cylinder 11a One end side 11b The other end side 11c Stopper surface 11d Outlet 11e Male screw 11f Air inlet / outlet 12 Water conduit 12a Inlet side 12b Outlet side 13 Cylinder chamber 13a End side 14 Piston 14a Piston end surface 14b Injection groove 14c Piston rod 14d Guide groove 15 Injection port 16 Spring 17 Fixing plate 17a Annular hole 17b Mounting screw 18 Handle 18a Connector 2 Cleaning nozzle 21 Outer cylinder 21a One end side 21b Other end side 21c Stopper surface 21d Outlet 21e Male screw 21f Air inlet / outlet hole 22 Water conduit 22a Inlet side 22b Outlet side 23 Cylinder chamber 23a End side 24 Piston 24a Piston end surface 24b Piston rod 25 Injection port 26 Spring 27 Fixing plate 27a Annular hole 27b Mounting screw 28 Handle 2 8a connector 3 cleaning nozzle 31 outer cylinder 31a one end side 31b other end side 31c step annular surface 31d jet outlet 31e male screw 31f air inlet / outlet 32 water conduit 32a inlet side 32b outlet side 33 cylinder chamber 33a tip side 34 piston 34a Piston tip surface 34b Piston rod 34c Male thread 35 Injection port 36 Spring 37 Fixed plate 37a Annular hole 37b Mounting screw 38 Handle 38a Connecting tool 39 Opening width adjusting annular plate 39a Female screw a Water pipe

Claims (5)

The outer cylindrical interior of the outer cylinder is divided into a water conduit and a cylinder chamber having a diameter larger than that of the water conduit, and one end of the outer cylinder, which is the inlet side of the water conduit, is fed by pressure wash water. Connected to the water pipe, the pressure wash water outlet used to remove the foreign matter inside the hollow cylinder of the outer cylinder is connected to the outlet side of the water conduit. A piston that is formed in a portion and slidably mounted in the cylinder chamber, and that is slidably mounted in the cylinder chamber. A piston is mounted in the cylinder chamber so that an injection groove serving as an injection port at the time of injection is formed, and an injection groove formed on the piston tip surface is disposed on the inner peripheral side of the injection port. To minimize the piston at the end of the cylinder chamber Place a spring in the cylinder chamber on the rear side of the piston that is normally urged above the normal water pressure acting on the piston front surface and below the rising water pressure in the event of an abnormality. A fixed plate that supports the spring that urges the piston is attached to the other end of the cylinder, and the stopper surface that locks the urged piston at the position of the minimum opening area of the jet outlet is located within the boundary between the water conduit and the cylinder chamber. A cleaning nozzle formed on the circumferential side. The outer cylindrical interior of the outer cylinder is divided into a water conduit and a cylinder chamber having a diameter larger than that of the water conduit, and one end of the outer cylinder, which is the inlet side of the water conduit, is fed by pressure wash water. Connected to the water pipe, the outlet of the pressure wash water that serves as the outlet when removing the foreign matter inside the hollow cylinder of the outer cylinder is used as the outlet side of the water channel, which is the boundary between the water channel and the cylinder chamber, and the tip side of the cylinder chamber A piston that is formed in a state of being connected to a part of the side peripheral surface of the nozzle and slidably mounted in the cylinder chamber to change the opening area of the jet outlet, and the piston is installed in the cylinder chamber in order to minimize the opening area of the jet outlet. A spring that is normally urged above the normal water pressure acting on the piston front surface and below the rising water pressure at the time of abnormality is arranged in the cylinder chamber on the rear side of the piston toward the front end side of the piston, and the rear end side of the cylinder chamber A spring that biases the piston to the other end of the outer cylinder A cleaning nozzle that has a stopper plate that holds the fixed plate to be held and locks the urged piston at the position of the minimum opening area of the jet outlet on the inner peripheral side of the boundary between the water conduit and the cylinder chamber . An annular hole is formed in the fixed plate, and the tip end of the piston rod connected to the rear part of the piston passes through the annular hole of the fixed plate and protrudes to the outside from the other end of the outer cylinder. The cleaning nozzle according to claim 1 or 2, further comprising a manual handle for forcibly retracting the piston so as to widen an opening area of the jet port. The hollow cylindrical interior of the outer cylinder is divided into a water conduit and a cylinder chamber in communication with each other, and one end of the outer cylinder, which is the inlet side of the water conduit, is connected to a water supply pipe to which pressure wash water is pumped. A jet of pressure washing water that serves as an outlet when removing foreign matter inside the hollow cylinder is formed on a part of the side peripheral surface on the tip side of the cylinder chamber that is the boundary between the water conduit and the cylinder chamber. A piston with a variable opening area is slidably mounted in the cylinder chamber, and the piston is directed to the front end of the cylinder chamber toward the front end side of the cylinder chamber, which is the boundary side with the water conduit, in order to minimize the opening area of the jet outlet. A spring that is always energized above the normal working water pressure and below the abnormal rising water pressure is placed in the cylinder chamber on the rear side of the piston, and the piston is attached to the other end of the outer cylinder that is the rear end side of the cylinder chamber. Attach an annular fixed plate that supports the spring The front end of the piston rod connected to the rear part of the stone is made to pass through the annular hole of the fixed plate and protrude from the other end of the outer cylinder to the outside, and comes into contact with the fixed plate and opens the piston through the piston rod. A cleaning nozzle, wherein an opening width adjusting annular disc that adjustably locks an area at a position of a desired minimum area is screwed in an adjustable manner to a side peripheral surface on the tip end side of a protruding piston rod. The cleaning nozzle according to claim 4, wherein a handle for manual operation for forcibly retracting the piston is attached to the tip of the projecting piston rod to widen the opening area of the jet nozzle.

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