JP3115073U - Liquid leakage prevention mechanism and liquid ejecting apparatus using the liquid leakage prevention mechanism - Google Patents

Abstract

A liquid leakage prevention mechanism capable of preventing liquid from leaking between a terminal portion of a liquid supply path and an ejection head, and a liquid ejection apparatus using the liquid leakage prevention mechanism.
A base portion (front wall 81) provided at a terminal portion of a liquid supply path (straight channel 28) is provided, and the base portion surrounds the terminal portion of the liquid supply path. 1 liquid leakage prevention part (small diameter O-ring 84) and 2nd liquid leakage prevention part (large diameter O ring 82) surrounding the 1st liquid leakage prevention part are provided. The two liquid leakage prevention unit is provided on the downstream side of the liquid supply path, and is configured to be able to contact an ejection head (sprinkling head 2) that ejects the liquid supplied from the liquid supply path. In addition, the first liquid leakage prevention part and / or the second liquid leakage prevention part is configured so that the abutting part that abuts the ejection head is flush with the base part.
[Selection] Figure 1

Description

  The present invention relates to a liquid leakage prevention mechanism and a liquid ejecting apparatus using the liquid leakage prevention mechanism.

  A water spray gun is an example of a liquid jetting device used for watering garden trees. In this type of water spray gun, the water spray mode (by switching the rotation position of the water spray head attached to the tip of the water supply pipe ( It is possible to freely switch between a shower mode, a straight injection mode, a diffusion injection mode, and the like, and an O-ring is provided at the communication portion between the tip of the water supply pipe and the nozzle hole for sealing (see Patent Document 1). ).

Registered utility model 3018671

  By the way, the O-ring provided at the communicating portion between the tip of the water supply pipe and the nozzle hole is of a small diameter. If the nozzle hole and the water supply pipe are connected with the watering head bent, the contact of the O-ring will deteriorate and the water Leakage is likely to occur, which adversely affects the jetting performance. Further, since the small-diameter O-ring is merely brought into contact with the surface on the watering head side, it is impossible to expect stabilization of the turning operation of the watering head due to the elasticity of the O-ring.

  In view of the above circumstances, the present invention provides a liquid leakage prevention mechanism that can prevent liquid from leaking between the terminal portion of the liquid supply path and the ejection head, and a liquid ejection apparatus that uses the liquid leakage prevention mechanism. With the goal.

  The liquid leakage prevention mechanism according to claim 1 has a base portion provided at a terminal portion of a liquid supply path, and the base portion surrounds the terminal portion of the liquid supply path. And a second liquid leakage prevention part surrounding the first liquid leakage prevention part, wherein the first liquid leakage prevention part and the second liquid leakage prevention part are provided downstream of the liquid supply path. It is configured to be capable of contacting an ejection head that ejects liquid supplied from the liquid supply path. According to a second aspect of the present invention, there is provided the liquid leakage prevention mechanism according to the first aspect, wherein the first liquid leakage prevention portion and / or the second liquid leakage prevention portion is in contact with the ejection head. The portion is configured to be flush with each other. According to a third aspect of the present invention, in the device according to the first or second aspect, the base is configured separately from the liquid supply member that forms the liquid supply path. It is characterized by that. According to a fourth aspect of the present invention, there is provided the liquid leakage prevention mechanism according to any one of the first to third aspects, wherein the first liquid leakage prevention portion is the terminal portion of the liquid supply path. It is characterized by being able to be in close contact with the outer periphery of the. According to a fifth aspect of the present invention, there is provided the liquid leakage prevention mechanism according to any one of the first to fourth aspects, wherein the first liquid leakage prevention section and / or the second liquid leakage prevention section. Is configured separately from the base portion. According to a sixth aspect of the present invention, there is provided the liquid leakage prevention mechanism according to any one of the first to fifth aspects, wherein the first liquid leakage prevention unit and / or the second liquid leakage prevention unit. Is provided in a substantially annular shape. According to a seventh aspect of the present invention, there is provided the liquid leakage prevention mechanism according to any one of the first to sixth aspects, wherein the first liquid leakage prevention portion and the second liquid leakage prevention portion are flexible. It is characterized by comprising a member having properties. The liquid ejecting apparatus according to claim 8 includes at least a liquid supply path and an ejection head that is provided on the downstream side of the liquid supply path and ejects the liquid supplied from the liquid supply path. The liquid leakage prevention mechanism according to any one of claims 1 to 7 is provided between the liquid supply path and the ejection head. According to a ninth aspect of the present invention, there is provided the liquid ejecting apparatus according to the eighth aspect, wherein the ejecting head is capable of ejecting liquid by at least the first ejecting method and the second ejecting method. And a second injection port that is rotatably provided at a terminal portion of the liquid supply path, and the partition wall portion facing the liquid leakage prevention mechanism of the injection head includes the first injection port and the second injection port. A first communication port and a second communication port that communicate with the ejection port are spaced apart from each other on substantially the same circumference around the rotation axis of the ejection head, and the ejection head rotates with respect to the liquid leakage prevention mechanism. By switching the position, the liquid supply path is selectively communicated with the first communication port or the second communication port, and the first injection method and the second injection method can be switched. It is characterized by. A liquid ejecting apparatus according to a tenth aspect is the device according to the ninth aspect, wherein the first liquid leakage preventing portion and the second liquid leakage preventing portion of the liquid leakage preventing mechanism are arranged on the ejection head. It is characterized in that it can be brought into contact with the partition wall. The liquid ejecting apparatus according to an eleventh aspect is the device according to the ninth or tenth aspect, wherein the first liquid leakage preventing portion of the liquid leakage preventing mechanism surrounds the first communication port. It is characterized by being set to a possible size. A liquid ejecting apparatus according to a twelfth aspect is the device according to any one of the ninth to eleventh aspects, wherein the second leakage preventing portion of the leakage preventing mechanism includes The size is set so as to be able to contact the outer edge of the partition wall of the ejection head.

  According to the present invention, the first leakage preventing portion and the second leakage preventing portion are provided in the base portion of the leakage preventing mechanism, and the first leakage preventing portion and the second leakage preventing portion are provided in the ejection head. Since it is configured to abut, it is possible to prevent water leakage to the outer peripheral side regardless of the rotation position of the ejection head. Moreover, since the 2nd liquid leakage prevention part maintains the relationship between the base part and the partition part of the watering head appropriately, the hit of the 1st liquid leakage prevention part can be optimized. Therefore, it is possible to ensure a reliable communication state without leakage from the liquid supply path to the ejection head. Further, by properly providing the relationship between the surfaces, the ejection head can be stably rotated, and unnecessary backlash can be prevented.

  Hereinafter, an embodiment in which the present invention is applied to a watering gun as a liquid ejecting apparatus will be described with reference to the drawings. In addition to the watering gun, the liquid ejecting apparatus also includes a sprinkler, a sprayer, and the like.

  1 is an exploded perspective view of a water spray gun according to an embodiment, FIG. 2 is a side cross-sectional view of the water spray gun, FIGS. 3 and 4 are side cross-sectional views used for explaining the operation, and FIGS. FIG. 7 is an enlarged side sectional view of the watering head portion, FIG. 8 is a view used for explaining the operation of the relationship between the watering head and the seal plate, and FIG. 9 is a front view of the tip of the water supply pipe.

  As shown in FIGS. 1 and 2, the water spray gun according to the present embodiment has a substantially pistol shape, and includes a gun main body 1 and a water spray head 2 as an ejection head attached to the tip of the gun main body 1. The gun body 1 includes a grip portion 3 that is a portion to be gripped by a hand and extends in the vertical direction, and a water spray head mounting portion 4 that extends forward in the horizontal direction at an upper portion thereof, and a water spray head at a front end of the water spray head mounting portion 4. 2 is attached.

  The exterior housing 10 of the gun body 1 is configured as a halved structure made of a transparent resin molded product. When the exterior housing 10 is made transparent (skeleton), the inside can be seen from the outside, so that it is easy to assemble and disassemble, and when the inside parts are damaged, there is an advantage that the broken part can be easily found from the outside. is there.

  Inside the gun body 1, a water supply pipe 20 and a horizontal pipe portion 22 are accommodated as liquid supply path members. Along the shape of the gun body 1 is a bent portion in the middle of the direction of water flow. The water supply pipe 20 is constituted by an assembly in which two parts, that is, the grip side water supply pipe 20A and the head side water supply pipe 20B are connected by a joint 20C. However, these may be integrally formed. The water supply pipe 20 is substantially located inside the grip part 3 to form a vertical pipe part 21, and the horizontal pipe part 22 is almost located inside the watering head mounting part 4, and the vertical pipe part 21 and the horizontal pipe part The water spray head 2 is connected to the tip of the horizontal pipe portion 22.

  A flow rate adjusting chamber 23 is provided in a bent portion formed by the vertical tube portion 21 and the horizontal tube portion 22, and a flow rate adjusting mechanism is provided inside the flow rate adjusting chamber 23 from the rear end opening of the horizontal tube portion 22. A cap-shaped flow rate adjusting member 71 constituting 70 is inserted. The flow rate adjusting member 71 is rotatably attached to the rear end opening of the horizontal pipe portion 22 with an attachment nut 72 and can be rotated by operating a knob 73 connected to the rear end. A notch 71 a is provided in a part of the cylindrical peripheral wall of the flow rate adjusting member 71, and the flow path extending from the vertical tube portion 21 to the horizontal tube portion 22 by operating the knob 73 to rotate the flow rate adjusting member 71. It is possible to adjust the degree of engagement of the notch 71a with respect to the flow rate, thereby adjusting the flow rate flowing through the flow path. In the present embodiment, the flow rate adjusting mechanism 70 is provided in the bent portion formed by the vertical tube portion 21 and the horizontal tube portion 22, but may be provided in addition to the bent portion. The flow rate adjusting mechanism 70 also functions as an opening / closing mechanism that opens and closes the water supply pipe 20 as a liquid supply path member or a flow path (straight flow paths 28, 38, etc.) in the horizontal pipe section 22.

  The flow path inside the horizontal pipe portion 22 is constituted by a straight flow path 28 extending from the bent portion (flow rate adjusting chamber 23) to the downstream end, and the inner wall of the straight flow path 28 has an inner wall of the straight flow path 28. A straightening rib 28A as a straightening member for straightening the water flow flowing along the axial direction is provided by integral molding. The length of the rectifying rib 28A in the direction along the straight flow path 28 is set to 20 to 100% of the length of the straight flow path 28 (in the illustrated example, 100%). As shown in FIG. It is preferable that the width d is set to 10 to 30% of the width or diameter of the straight flow path 28, and the height h of the cross section is set to 30 to 70% of the height or diameter of the straight flow path 28.

  In addition, an opening / closing valve 30 serving as an opening / closing mechanism for opening / closing the flow path is provided at an intermediate portion in the length direction of the vertical pipe portion 21 of the water supply pipe 20. The on-off valve 30 has a valve seat 31 provided at a step portion in the middle of the flow path in the vertical pipe portion 21 of the water supply pipe 20 and a valve body 32 corresponding to the valve seat 31 at the tip, and is upstream of the valve seat 31. And a hollow valve rod 36 that is slidably accommodated in the vertical tube portion 21 on the side and that has its own internal space as a straight water supply channel 37 for water supply. An O-ring 33 that is in close contact with the valve seat 31 is fitted to the outer periphery of the valve body 32, and an O-ring 34 that is in close contact with the inner peripheral wall of the vertical tube portion 21 is provided in the sliding portion of the valve rod 36.

  Then, the water that is positioned between the seals 33 and 34 and that has passed through the linear flow path 37 in the valve rod 36 when the valve body 32 is separated from the valve seat 31 on the outer periphery of the tip of the valve rod 36. A communication window 35 is opened to allow the air to flow into the flow path on the downstream side of the valve seat 31 through the gap with the inner peripheral wall of the vertical pipe portion 21. Further, the valve rod 36 is urged by a valve spring 39 in a direction in which the valve body 32 is in close contact with the valve seat 31 (a direction in which the valve is closed). Therefore, the on-off valve 30 can be opened by sliding the valve rod 36 away from the valve seat 31 against the force of the valve spring 39.

  As means for operating the opening / closing valve 30, the operation lever 11 and the internal lever 12 are arranged outside the water supply pipe 20, and an annular rib 38 that also serves as a valve spring receiver is formed on the outer periphery of the valve rod 36, and the vertical pipe portion 21. An opening 13 for allowing the operating end of the internal lever 12 to reach the annular rib 38 of the valve rod 36 is formed in the peripheral wall.

  The operation lever 11 is swingably attached to the outer housing 10, and the internal lever 12 is swingably attached to the vertical pipe portion 21. Then, by firmly grasping the operating lever 11, the inner lever 12 is swung by the swinging operation of the operating lever 11, and the annular rib 38 of the valve rod 36 is pushed down by the operating end of the inner lever 12, thereby opening and closing the valve. 30 can be opened, and by releasing the operation lever 11, the valve rod 36 can be returned to the closed position and the internal lever 12 and the operation lever 11 can be returned to their initial positions by the restoring force of the valve spring 39. It can be done.

  A terminal member 50 is attached to the terminal portion on the upstream side of the vertical tube portion 21 (the lower end side of the grip portion 3). The terminal member 50 includes a nut-shaped connection bracket 51 directly fixed to the lower end of the vertical pipe portion 21, and an upper limit stopper for a seal body and a piston body 61, which will be described later, inserted into the connection bracket 51 via a packing 58. The sleeve 52 also has a function, and a water supply hose joint member 53 that is screwed to the opening end of the connection bracket 51 via a packing 55 and has a water supply hose connection portion 59 at the lower end.

  The water supply hose joint member 53 is formed with a flow passage 56 penetrating the flow passage in the vertical pipe portion 21, that is, in this case, the straight flow passage 37 in the valve rod 36. A half part is an expansion absorption chamber 54 having a diameter larger than that of the straight flow path 37. A large-diameter portion of the piston body 61 constituting the expansion absorption mechanism 60 is accommodated inside the expansion absorption chamber 54 through an O-ring 63 so as to be slidable. The expansion absorption mechanism 60 expands the volume when water remaining in the flow path in the water supply pipe 20 upstream of the open / close valve 30 (particularly the straight flow path 37 in the valve rod 36) freezes. It is for absorbing.

  The piston body 61 has a narrow rod portion under the neck of the large diameter portion and has a through channel 62 that penetrates the entire length in the axial direction. The small rod portion is connected to the small diameter of the flow passage 56. It is slidably inserted through the O-ring 64 into the lower half of the lower half. The piston body 61 is expanded by an expansion absorbing spring 65 as an elastic member interposed between the step portion at the boundary between the upper half portion and the lower half portion of the flow passage 56 and the back surface of the large diameter portion of the piston body 61. Is urged upward to a position (initial position) where it hits the lower end of the sleeve 52. With this configuration, the pressure receiving portion 61 a of the large-diameter portion of the piston body 61 faces in a posture perpendicular to the linear flow path 37 in the valve rod 36. Accordingly, when the expansion pressure acts on the pressure receiving portion 61 a and the piston body 61 slides downward, the expansion absorption spring 65 absorbs the expansion pressure via the piston body 61. In the present embodiment, the pressure receiving portion 61a of the piston body 61 is configured in a planar shape, but may be any configuration that can receive the expansion pressure, and is particularly limited to a planar shape. is not. Further, although the liquid absorption mechanism 60 of the present embodiment is provided on the upstream side of the on-off valve 30, it may be provided on the downstream side.

  Next, the structure of the watering head 2 as an ejection head is demonstrated. At the tip of the water supply pipe 20 (straight channel 28), there is a head body 100 and a shower plate 120 as an injection part arranged on the front surface thereof, and the rotational position of the water supply pipe 20 with respect to the tip is switched. The watering head 2 capable of switching the spraying method is rotatably attached, and a cover ring 110 as a cover member for protecting the shower plate 120 is attached to the outer periphery of the head main body 100.

  More specifically, referring to FIGS. 5 and 6 together, the tip of the horizontal pipe portion 22 of the water supply pipe 20 communicates with the straight flow path 28 in the horizontal pipe portion 22 at a position eccentric from its center. A seal plate 80 having a water discharge port 83 as a liquid leakage prevention mechanism is connected substantially vertically, and is supported on the front side of the seal plate 80 so as to be rotatable about an axis concentric with the center of the seal plate 80. The watering head 2 which can switch an injection method by switching the rotation position with respect to the board 80 is arrange | positioned.

  The watering head 2 includes a head body 100, a shower plate 120, and a cover ring 110. In addition, although what was comprised separately in this Embodiment is demonstrated, any or all may be comprised integrally. The head main body 100 has a substantially cup shape in which the rear end of the cylindrical peripheral wall 101 is closed with a partition wall 102, and an attachment boss 108 with a screw hole 108 a substantially parallel to the peripheral wall 101 is formed at the center of the front surface of the partition wall 102. The straight injection nozzle 104, the diffusion injection nozzle 105, and the shower injection nozzle 106 are arranged on the same circumference centering on the same and spaced apart from each other. In addition, about the injection method, it can adopt suitably other than a straight, spreading | diffusion, and a shower.

  The straight injection nozzle 104 and the diffusion injection nozzle 105 are rod-shaped having penetrating nozzle holes 104 a and 105 a, are provided in parallel with the mounting boss 108, and extend to a position protruding from the peripheral wall 101. A cross groove 105b that crosses the nozzle hole 106a is provided at the tip of the diffusion spray nozzle 106, so that the water flow can be diffused and sprayed.

  The shower spray nozzle 106 has a short cylindrical shape in which the tip is closed by the abutting wall 106 a and a plurality of openings 106 b are formed in the peripheral wall portion, and communicates with the buffer space 109 inside the head body 100.

  A fitting flange 103 is provided at the rear end of the head body 100 with a slight gap between the head body 100 and the partition wall 102. The watering head 2 including the head main body 100 is rotatably attached to the gun main body 1 by fitting the fitting flange 103 into the annular groove on the inner periphery of the front end of the outer housing 10. Further, on the outer periphery of the peripheral wall 101 of the head main body 100, an engaging convex portion 107 is provided as an engaged portion that protrudes at a slight height corresponding to the position of each nozzle 104, 105, 106. .

  The seal plate 80 facing the back surface of the partition wall 102 of the head main body 100 is substantially disk-shaped, and has a front wall 81 as a base portion as shown in FIG. A large-diameter annular convex portion 81a formed on the peripheral portion of the spout 83 and a small-diameter annular convex portion 81b formed on the peripheral edge of the water discharge port 83 are provided. In each groove formed in the large-diameter annular convex portion 81a and the small-diameter annular convex portion 81b, a large-diameter O-ring 82 as a second liquid leakage preventing portion and a first liquid leakage preventing portion as A small-diameter O-ring 84 is fitted. In the present embodiment, the large-diameter O-ring 82 and the small-diameter O-ring 84 are configured separately from the front wall 81, but may be configured integrally or the large-diameter O-ring 82. The small-diameter O-ring 84 is preferably formed of rubber or other flexible member.

  These O-rings 82 and 84 seal the space between the back wall of the watering head 2 (the partition wall 102 of the head main body 100) and the front wall 81 of the seal plate 80, and the large-diameter O-ring 82 is a nozzle. It is located on the circumference centering on the rotating shaft (mounting boss 108) of the watering head 2 on the outer peripheral side from the position where 104, 105, 106 is arranged. The small-diameter O-ring 84 is located in a region inside the large-diameter O-ring 82 and is located so as to surround the water outlet 83.

  An annular convex portion 86 is formed on the back wall 85 of the seal plate 80 at the periphery of the water discharge port 83, and a positioning notch 86 a is provided at one circumferential position of the annular convex portion 86. Yes. On the other hand, on the outer periphery of the distal end portion of the horizontal pipe portion 22 of the water supply pipe 20, there is provided an annular flange 26 fitted to the inner periphery of the annular convex portion 86 of the seal plate 80, and at one place in the circumferential direction of the annular flange 26. Is provided with a protrusion 26 a that fits into the notch 86 a of the annular protrusion 86. Then, the notch 86a and the projection 26a are combined to fit the annular flange 26 to the annular convex portion 86, and the tip of the horizontal pipe portion 22 is inserted into the water outlet 83, so that the horizontal pipe portion 22 of the water supply pipe 20 is A seal plate 80 is attached to the tip so as not to rotate.

  By combining in this way, the nozzle 106 on the head body 100 side and the nozzle holes 104a and 105a as the communication port and the water discharge port 83 of the seal plate 80 are selectively communicated according to the rotational position of the water spray head 2, Thereby, a water flow can be jetted by a predetermined jetting method.

  The cover ring 110 is preferably configured as a cylindrical molded body made of a flexible resin. Examples of the material include EVA (ethylene acetate copolymer), thermoplastic elastomer, soft polyethylene, soft vinyl chloride, and the like. Can be mentioned.

  The cover ring 110 includes a cylindrical peripheral wall portion 111 and an annular fitting wall 112 as a locking portion extending on the inner periphery of the front end thereof. A fitting groove 112a into which the tip of the peripheral wall 101 fits is formed. The peripheral wall 111 is provided with a circular engagement hole (notch) 113 as an engagement portion into which the engagement protrusion 107 on the head main body 100 side is fitted. In the present embodiment, the engagement hole 113 is a notch that penetrates the cover ring 110, but it is sufficient that the head body 100 is visible from the engagement portion of the cover ring 110. Only the engaging part may be constituted by a transparent member and closed, and may be not cut out as described above.

  The cover ring 110 has its own peripheral wall 111 attached to the peripheral wall 101 of the head main body 100 in a state where the engagement hole 113 formed in the peripheral wall 111 and the engagement convex portion 107 formed in the head main body 100 are engaged with each other. Is fixed to the head main body 100 by being fitted to the outer periphery of the head.

  The shower plate 120 is fixed to the head body 100 by fitting the outer periphery thereof to the inner periphery of the fitting wall 112 of the cover ring 110. The shower plate 120 includes a gently convex curved face plate 121 having a pore array 125 for watering the shower, a short cylindrical portion 122 connected to the outer periphery of the face plate 121, and an extension of the outer peripheral edge of the face plate 121. The outer peripheral flange portion 123 is provided, and the short cylindrical portion 122 is fitted to the inner periphery of the fitting wall 112 of the cover ring 110 while the outer peripheral flange portion 123 is applied to the front surface of the fitting wall 112. Accordingly, the head ring 100 is fixed to the cover ring 110 and is fixed to the head main body 100 via the cover ring 110.

  Further, an attachment boss 126 with a screw passage hole 126 a is provided at the center of the cover ring 110, and the tip of the attachment screw 150 passed through the screw passage hole 126 a of the attachment boss 126 projects to the center of the head body 100. It is directly fixed to the head main body 100 by being fastened to the screw hole 108a of the mounting boss 108 provided.

  By fixing the shower plate 120 to the head main body 100 in this way, the tip of the straight injection nozzle 104 of the head main body 100 is exposed to the front from an exposure hole 127 as an injection port formed in the face plate 121 of the shower plate 120. Similarly, the tip of the diffusion spray nozzle 105 of the head main body 100 is exposed to the front from an exposure hole 128 as a spray port formed in the face plate 121 of the shower plate 120.

  Further, depending on the combination of the cover ring 110 and the head main body 100, the engaging portions of the engaging convex portion 107 and the engaging hole 113 serve as marks for realizing the respective ejection methods. A reference mark portion 29 exposed from the outer housing 10 by providing an identification mark (for example, a character or a figure) for identifying each injection method and protruding from the upper surface of the horizontal pipe portion 22 of the water supply pipe 20. In addition, by rotating the watering head 2 so that the identification mark is matched, the straight injection mode, the diffusion injection mode, and the shower injection mode can be selectively switched. The cover ring 110 and the head main body 100 have a distinct color difference in molding material, so that the engaging protrusion 103 exposed on the cover ring 110 is visually noticeable. Yes.

  Next, the operation will be described. In order to use the watering gun according to the present embodiment, a water supply hose (not shown) is connected to the water supply hose connection part 59 of the water supply hose joint member 53, and the operation lever 11 is firmly gripped in this state. Then, as shown in FIG. 3, the inner lever 12 is swung by swinging the operating lever 11, and the annular rib 38 moves downward by being pushed by the operating end of the inner lever 12, so that the valve rod 36 is moved. Slide down. When the valve body 32 is separated from the valve seat 31, the opening / closing valve 30 is opened, and water supplied from the water supply hose is supplied to the watering head 2 through the opening / closing valve 30.

  The watering head 2 ejects water forward in a predetermined watering mode by selecting the watering mode according to its rotational position. For example, when the straight injection mode is selected, water is injected through the straight injection nozzle 104 by connecting the straight injection nozzle 104 to the straight flow path 28 of the horizontal pipe line 22. When the diffusion injection mode is selected, water is injected through the diffusion injection nozzle 105 by connecting the diffusion injection nozzle 105 to the straight flow path 28 of the horizontal pipe line 22. When the shower injection mode is selected, water is introduced from the shower injection nozzle 106 into the buffer space 109 by connecting the shower injection nozzle 106 to the straight flow path 28 of the horizontal pipe 22, and from there the shower plate It is sprayed in the form of a shower through 120 example pores 125.

  After use, by releasing the hand that grips the operation lever 11, the restoring force of the valve spring 39 causes the valve rod 36 to return to the closed position, and at the same time, the internal lever 12 and the operation lever 11 return to the initial position. As shown, the open / close valve 30 is closed.

  Further, the water spray gun according to the present embodiment has a function of absorbing expansion during freezing, and can exert an effect of preventing the water supply pipe 20 from being damaged particularly in a cold region. For example, when the opening / closing valve 30 of the water spray gun is closed, the water remaining in front of the opening / closing valve 30 in the water supply pipe 20 (upstream side) does not escape as long as the opening / closing valve 30 is closed even if the water spray gun is shaken. . Therefore, when the remaining water freezes, the water supply pipe 20 may be damaged due to the expansion of the volume accompanying the freezing.

  However, since this water spray gun is provided with an expansion absorbing mechanism 60 that absorbs the expansion of the volume when the remaining water freezes on the upstream side of the opening / closing valve 30 of the flow path in the water supply pipe 20, it absorbs the expansion. The mechanism 60 can absorb the freezing and expansion of the residual water, and can prevent the water supply pipe 20 from being damaged.

  Specifically, when water accumulated in the straight flow path 37 in the valve rod 36 is frozen, the expansion pressure acts in the axial direction of the straight flow path 37, and the pressure receiving portion of the expansion absorption mechanism 60 at the end of the water supply pipe 20. It reaches 61a smoothly. Therefore, the expansion absorption mechanism 60 can reliably absorb the expansion pressure acting on the pressure receiving portion 61a, and can prevent the water supply pipe 20 from being damaged. In particular, since an expansion absorption chamber 54 having a diameter larger than that of the straight flow path 37 is provided at the upstream end portion of the straight flow path 37, the expansion pressure due to freezing of residual water is caused in the expansion absorption chamber 54. The piston body 61 can be surely received, and as shown in FIG. 4, the piston body 61 is moved by the expansion pressure, so that the expansion absorption spring 65 at the back can absorb the expansion pressure.

  At the time of freezing, it begins to freeze from a thin part (straight flow path 37) that is easily affected by outside air, and the freezing gradually proceeds to the terminal side and reaches into the expansion absorption chamber 54. Therefore, the expansion pressure due to freezing effectively acts on the pressure receiving portion of the piston body 61 in the expansion absorption chamber 54 from the straight flow path 37, whereby the expansion is reliably absorbed and the water pipe 20 is prevented from being damaged. Can be demonstrated.

  Further, the water spray gun has a function of preventing vortex flow generated in the flow path until jetting. That is, a straight flow path 28 is formed from the bent portion (flow rate adjusting chamber 23) to the downstream end of the horizontal pipe line 22, and a flow regulating rib 28A for rectifying the flowing water flow on the inner wall of the straight flow path 28. Therefore, it is possible to prevent the generation of vortices and create a linear flow. In particular, since the flow straightening ribs 28A are provided at the downstream portion of the bent portion where the flow is likely to be disturbed, the generation of vortex can be effectively prevented. Therefore, it is possible to prevent the water flow to be ejected from being biased or bent, and a stable and uniform ejection state can be obtained.

  Further, since the rectifying rib 28A is integrally formed on the inner wall of the horizontal pipe line 22 forming the straight flow path 28, there is no trouble in assembling and it is possible to prevent an increase in cost. Further, since the rectifying rib 28A is projected from the inner wall of the straight flow path 28, the cross-sectional dimension (width d and protruding height h) of the rectifying rib 28A is optimal to reduce the water flow resistance and effectively prevent vortex flow. Can be set to any value. Further, since the rectifying rib 28A protrudes from the inner wall on the outer peripheral side of the bent portion, the maximum eddy current preventing effect can be exhibited while reducing the water flow resistance.

  In this water spray gun, the flexible cover ring 110 is fitted and fixed to the head main body 100, and the outer periphery of the shower plate 120 is fitted and fixed to the cover ring 110, so that the cover ring 110 itself has a packing function. Can be made. Therefore, it is possible to obtain an action of preventing water leakage to the outer peripheral side of the shower plate 120 while no packing is required.

  Moreover, since it is not necessary to have a packing mounting portion that tends to be a weak point in strength when it is formed of a resin molded product, the strength can be improved. Further, since the impact absorbing action is obtained by the flexibility of the cover ring 110, the durability can be improved. In addition, since a ring nut and extra packing for fixing the shower plate 120 are not required as in the conventional example, the number of parts can be reduced, and the structure is simplified correspondingly, resulting in cost reduction and compactness. Can be achieved. Further, since it is not necessary to fix the shower plate 120 and the cover ring 110 with screws, assembly / disassembly is easy and maintenance can be improved.

  Further, in this water spray gun, the cover ring 110 is prevented from coming off by the engagement of the engagement hole 113 on the cover ring 110 side and the engagement convex portion 107 on the head main body 100 side. Since the combination of the engaging convex portions 107 is used as a mark when selecting an ejection method, it is not necessary to provide a dedicated alignment mark by printing or the like, which can contribute to cost reduction. Further, when the identification mark is provided on the engagement convex portion 107 by a method such as printing or sticking, the shape combination of the engagement hole 113 and the engagement convex portion 107 is used, so that the cover ring 11 is directly printed or pasted. Compared to the case where the identification mark is provided by the above method, the identification mark is less likely to deteriorate.

  Further, in this water spray gun, a larger-diameter O-ring 82 is provided outside the small-diameter O-ring 84 provided around the water outlet 83 of the seal plate 80, and the nozzle 106 and the nozzle hole 104, Since the region on the outer peripheral side of 105 is sealed, water leakage to the outer peripheral side can be prevented regardless of the rotation position of the water spray head 2.

  For example, as shown in FIG. 8 (a), there is no problem when the shower spray nozzle 106 and the water discharge port 83 of the seal plate 80 are properly matched, but the position is shifted to an intermediate position as shown in (b). In some cases, water from the spout 83 passes through the small-diameter O-ring 84 and leaks into the gap between the seal plate 80 and the back surface of the water spray head 2, but due to the large-diameter O-ring 82, Leakage can be prevented at the outer peripheral position.

  Further, the large-diameter O-ring 82 appropriately maintains the relationship between the front wall 81 of the seal plate 80 and the rear wall of the water spray head 2 (the rear surface of the partition wall 102 of the head main body 100). Can be optimized. That is, since the relationship between the surface on the seal plate 80 side and the surface on the water spray head 2 side can be properly achieved by the large diameter O-ring 82, the contact of the small diameter O-ring 84 with the water spray head 2 should be optimized. Therefore, a reliable communication state without leakage between the water discharge port 83 and the nozzles 104, 105, 106 can be ensured. In addition, when the relationship between the surfaces is properly set, the water spray head 2 can be stably rotated, and unnecessary backlash can be prevented.

  In the above-described embodiment, the case where one rectifying rib 28A is provided has been described. However, as shown in FIG. 10, a plurality of rectifying ribs 28B may be provided at appropriate angular intervals.

It is a disassembled perspective view of the watering gun of the embodiment of the present invention. It is a sectional side view of the watering gun. It is a sectional side view which shows the state of the on-off valve at the time of water injection of the watering gun. It is a sectional side view for an operation explanation at the time of freezing of the same spray gun. It is an expansion disassembled perspective view of the watering head in the watering gun. It is the expansion exploded perspective view seen from another direction of the watering head. It is an expanded sectional side view of the watering head part. It is a figure used for description of an effect | action of the relationship between the watering head and a seal board, (a) is a proper alignment state, (b) is a figure which shows the state in the middle. It is a front view of the front-end | tip of the water supply pipe | tube in the watering gun. It is a front view of the front-end | tip of the water supply pipe in another embodiment.

Explanation of symbols

1 Gun body 2 Watering head (jet head)
20 Water supply pipe (liquid supply member)
22 Horizontal pipe (liquid supply member)
23 Flow control chamber (bent part)
28 Straight channel (liquid supply channel)
28A, 28B Rectification rib (rectification member)
30 Open / close valve (open / close mechanism)
31 Valve seat 32 Valve body 36 Valve rod 37 Linear flow path (liquid supply path)
DESCRIPTION OF SYMBOLS 50 Terminal member 53 Water supply hose coupling member 54 Expansion absorption chamber 59 Water supply hose connection part 60 Expansion absorption mechanism 61 Piston body 61a Pressure receiving part 62 Through flow path 65 Expansion absorption spring (elastic member)
71 Flow rate adjusting member (opening / closing mechanism)
80 Seal plate (leakage prevention mechanism)
81 Front wall (base)
83 Water outlet 82 Large diameter O-ring (second liquid leakage prevention part)
84 Small-diameter O-ring (first leakage prevention part)
DESCRIPTION OF SYMBOLS 100 Head main body 101 Perimeter wall 102 Partition part 104 Straight injection nozzle 104a Nozzle hole (1st communication port)
105 Diffusion nozzle 105a Nozzle hole (second communication port)
106 Shower injection nozzle (nozzle hole) (second communication port)
107 engaging convex part (engaged part)
110 Covering (cover member)
111 Peripheral wall part 112 Fitting wall (locking part, ridge wall)
112a Fitting groove 113 Engagement hole (notch) (engagement part)
120 Shower plate (jetting part)
121 Face plate 125 Example of pores (injection port, first injection port)
127,128 Exposed hole (jet port, second jet port)

Claims (12)

A base part provided at a terminal part of the liquid supply path, wherein the base part includes a first liquid leakage prevention part surrounding the terminal part of the liquid supply path, and the first liquid leakage prevention part. A second liquid leakage prevention part is provided,
The first liquid leakage prevention part and the second liquid leakage prevention part are provided on the downstream side of the liquid supply path and are configured to be able to contact an ejection head that ejects liquid supplied from the liquid supply path. A leakage prevention mechanism characterized by that.   2. The liquid leakage prevention mechanism according to claim 1, wherein the first liquid leakage prevention unit and / or the second liquid leakage prevention unit is configured such that a contact portion that contacts the ejection head is configured to be flush with each other. .   The liquid leakage prevention mechanism according to claim 1, wherein the base portion is configured separately from a liquid supply member that forms the liquid supply path.   The liquid leakage prevention device according to any one of claims 1 to 3, wherein the first liquid leakage prevention portion is configured to be in close contact with an outer periphery of the terminal portion of the liquid supply path. mechanism.   5. The device according to claim 1, wherein the first liquid leakage prevention unit and / or the second liquid leakage prevention unit is configured separately from the base unit. 6. Leakage prevention mechanism.   The liquid leakage prevention mechanism according to any one of claims 1 to 5, wherein the first liquid leakage prevention part and / or the second liquid leakage prevention part is provided in a substantially annular shape. .   The liquid leakage prevention mechanism according to any one of claims 1 to 6, wherein the first liquid leakage prevention unit and the second liquid leakage prevention unit are configured by members having flexibility. At least a liquid supply path, and an ejection head that is provided on the downstream side of the liquid supply path and ejects the liquid supplied from the liquid supply path,
A liquid ejecting apparatus according to claim 1, wherein the liquid leakage preventing mechanism according to claim 1 is provided between the liquid supply path and the ejecting head. The ejecting head has a first ejecting port and a second ejecting port capable of ejecting liquid by at least the first ejecting method and the second ejecting method, and is provided rotatably at a terminal portion of the liquid supply path. And
A first communicating port and a second communicating port that communicate with the first and second ejection ports, respectively, on the partition wall portion of the ejection head that faces the liquid leakage prevention mechanism are pivot shafts of the ejection head. Are spaced apart on substantially the same circumference centered on
By switching the rotation position of the ejection head with respect to the liquid leakage prevention mechanism, the liquid supply path is selectively communicated with the first communication port or the second communication port, and the first ejection method and the second The liquid ejecting apparatus according to claim 8, wherein the liquid ejecting method can be switched.   10. The liquid according to claim 9, wherein the first liquid leakage prevention unit and the second liquid leakage prevention unit of the liquid leakage prevention mechanism are configured to be able to contact the partition wall of the ejection head. Injection device.   11. The liquid ejecting apparatus according to claim 9, wherein the first liquid leakage preventing portion of the liquid leakage preventing mechanism is set to a size capable of surrounding the first communication port. . 12. The second liquid leakage prevention portion of the liquid leakage prevention mechanism is set to a size that can contact an outer edge portion of the partition wall portion of the ejection head. The liquid ejecting apparatus according to any one of the above.

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