JPH10390A - Swing sprinkler - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To perform a control work and a watering work, and to easily switch between them. SOLUTION: A liquid discharge unit is arranged on a swing case D, the swing case is configured to be able to swing up and down at a set angle, and a drive unit that is driven to rotate by a water flow is arranged in the swing case. The swinging case is driven by this driving force, and a relief valve 35 is attached to the swinging case, and a pressure chamber A for storing pressurized water in the swinging case and water is supplied to the liquid discharge section. A water supply chamber C is provided, the relief valve 35 is disposed between the pressure chamber and the water supply chamber, a release mechanism is provided in the relief valve,
The release mechanism is configured to be operable from outside the swing case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an orchard,
The present invention relates to a portable oscillating water sprinkler capable of performing control and water spraying, spraying water in a horizontal or horizontal direction in a circular or fan shape in a field such as a golf course or a field, and performing control.

[0002]

2. Description of the Related Art Conventionally, control work in an orchard is performed manually by drawing a spray hose or by using a speed sprayer having a chemical solution tank, a power sprayer, an engine, a nozzle and the like arranged on a traveling machine body. In the meantime, the chemicals were sprayed from nozzles to control the insects. Sprinklers have been used to spray water on large fields such as golf courses and fields, and boom sprayers and the like have been used for control.

[0003]

However, when performing control in an orchard, if the orchard is large, manual work requires a great deal of labor, and in a pest control operation using a traveling control device such as a speed sprayer, it is possible to run. Limited to the orchard. In other words, in a steep orchard, it may not be possible to climb or fall down, and in a weak field, the vehicle may be stuck and unable to travel. Also, when sprinklers are used for watering large fields such as golf courses and fields, it is necessary to install sprinklers in advance. In doing so, it was necessary to remove or avoid the sprinkler and piping. In addition, the sprayed chemicals were sometimes exposed. Therefore, an attempt is made to provide a watering control apparatus in which the control operation and the watering operation can be easily switched and the installation can be easily performed.

[0004]

The present invention uses the following means in order to solve the above problems. That is, the liquid discharge unit is arranged on the swing case D, the swing case is configured to be able to swing up and down at a set angle, and a drive unit that is driven to rotate by water flow is arranged in the swing case. The swing case is driven to swing by a driving force, a relief valve 35 is attached to the swing case, a pressure chamber A for storing pressurized water in the swing case, and a water supply for sending water to a liquid discharge unit. A chamber C was provided, the relief valve 35 was disposed between the pressure chamber and the water supply chamber, a release mechanism was provided in the relief valve, and the release mechanism was configured to be operable from outside the swing case.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram showing a state in which a control operation is performed using a portable rocking and sprinkling control apparatus, FIG. 2 is a front sectional view of the portable rocking and spraying control apparatus, FIG. 3 is a plan view, and FIG. FIG. 5 is a side view, FIG.
6 is a sectional view taken along the line VV in FIG. 2, FIG. 7 is a sectional view taken along the line WW in FIG. 2, FIG. 8 is a sectional view taken along the line XX in FIG. 2, and FIG. FIG. 10 is a sectional view taken along the arrow Y.
Is a bottom view showing the release knob portion of the relief valve, FIG. 11 is a bottom sectional view of the same, FIG. 12 is a view taken in the direction of arrow Z in FIG.
FIG. 13 is a front view of the sprinkler, and FIG. 14 is a plan view of the same.

First, the portable rocking and sprinkling control apparatus 1 of the present invention.
Can be used for pest control work and watering work in orchards and the like. As shown in FIG. 1, a hose 3 communicating with a water supply port such as a power sprayer 2 or a pump is connected to a chemical tank 6 or a river or well. A hose 4 connected to and connected to the discharge port is connected to the suction port of the portable oscillating water sprinkler 1 via a branch pipe 5. The portable oscillating sprinkler 1 according to the present invention includes a oscillating case D, which will be described later, swinging back and forth (reciprocating back and forth), and a horizontal reciprocation of a sprinkler 14 provided on the oscillating case D and serving as a liquid discharge unit. By rotating, a chemical solution or water is discharged in a hemispherical shape so that crops above, behind, left, right and above can be controlled and watered. In addition, by disposing the medicine tank 6 at a high place, it is possible to spray without using the power sprayer 2. In addition, instead of the hose 4, piping on a shelf or piping in the ground can be performed.

[0007] The overall structure of the portable oscillating sprinkler 1 according to the present invention will be described. As shown in FIGS. 2, 3, and 4,
Bearing cases 10L and 10R are disposed on both left and right sides, and the bearing cases 10L and 10R are integrally supported by a stand 13. A swing case D is provided between the bearing cases 10L and 10R with a first shaft center in the left-right direction. It is swingably supported about P. The swing case D is a sprinkler case 11
And the gear case 12.
The R and sprinkler case 11 and the gear case 12 are assembled into a cylindrical or egg shape. A plug 17 is communicated outside the position of the axis P of the bearing case 10R so that a hose communicating with the branch pipe 5 can be connected so that water or a chemical solution can be sent.

In the swing case D, a pressure chamber A and a gear chamber B are arranged in a gear case 12 and a sprinkler case 11 is provided.
The water supply chamber C is arranged inside. A water flow pipe 2 is provided in the pressure chamber A.
The 2F / 22R and the valve mechanism are housed, the reduction mechanism 9 is housed in the gear chamber B, and the water wheel 23 is housed in the water supply chamber C. A sprinkler 14 is disposed on the sprinkler case 11, and a base pipe 15 of the sprinkler 14 is provided.
Has its axis (second axis) Q disposed at right angles to the first axis P, and the nozzle 16 of the sprinkler 14 is disposed at right angles to the first axis P. Are arranged so as to be rotatable around the second axis Q. In this way, by connecting the hose to the plug 17 and sending water to the plug 17, the water flow is used to swing the sprinkler case 11 and the gear case 12, and the sprinkler 14 also reciprocates at the same time. Sprayed, or
The swing about the first axis P is stopped, and the swing case D is manually turned to turn the second axis Q in the vertical direction. It is rotated 360 ° continuously in the direction to spray or control water in a horizontal plane circular shape.

Next, a specific configuration will be described. As shown in FIG. 4, the stand 13 is formed by bending a steel pipe or a pipe made of synthetic resin into a U-shape in a side view, and having an upper end in a bearing case 10L.
・ Fixed to 10R, and installed and supported on the ground at the lower horizontal part.
When the sprinkler 14 is rotated left and right, the stand 13 is rotated.
So that spraying is not impeded by

As shown in FIG. 2, the bearing case 10L is provided with a through-hole 10 at the position of the axis (first axis P) in the left-right direction.
a, and rotatably supports a support shaft 11a protruding laterally at a left axial position of the sprinkler case 11,
It is prevented from coming off by the screw 18. Bearing case 10R
A through hole 10b is opened at an axial position, and a communication hole is opened at an axial position on the right side surface of the gear case 12 to form a female screw portion 12a.
To form a pipe-shaped connecting pipe 19 through the through-hole 10a.
The bearing case 10L and the gear case 12 are prevented from coming off. The strainer 20 is inserted into the through hole 10a, and the plug 17 is screwed.

The left side of the gear case 12 is open,
The open portion is closed by a gear case lid 21. As shown in FIG. 6, a partition wall 12b is provided in the gear case 12 in a diametric direction, and the inside of the gear case 12 is divided into a pressure chamber A and a gear chamber B by the partition wall 12b. Is divided into Then, the sprinkler case 11 is replaced with the gear case 12.
The gear case cover 21 is fixed at the same time by fixing the gear case cover 21 to the sprinkler case 11 and the gear case cover 21.
This forms a water supply chamber C. The pressure chamber A is communicated with the connection pipe 19 through a communication hole 12c opened at the axial center of the right side surface of the gear case 12, and water flow pipes 22F and 22R are provided in the pressure chamber A in parallel with the first axis P. A pair is arranged.

The left ends of the water flow pipes 22F and 22R are fixed to the gear case cover 21, and as shown in FIG.
Discharge ports 22Fa and 22Ra are provided on the left surface of 22R. Discharge port 22Fa is directed toward one side (front) of a blade of water turbine 23 described later, and discharge port 22Ra is disposed on the other side (rear) of the blade. The water turbine 23 is configured to discharge toward one side, so that the water wheel 23 can be rotated by discharging from any one of them. At the right end of the water flow pipes 22F and 22R, suction ports 22Fb and 22Rb are provided.
A switching valve 24 is disposed on the right side of 2Rb.
Reference numeral 4 denotes a seesaw shape, and the front and rear center is a suction port 22Fb.
・ Pivot by pin 24a on the side of 22Rb, and switch valve 24
Is tilted to close one of the suction ports 22Fb and 22Rb and open the other.

A valve arm 25 is arranged on the right side of the gear case 12 so as to face the switching valve 24 (on the right side) so that the switching valve 24 can be switched. That is, the valve arm 25 is formed in a T-shape in plan view, and both ends of the contact portion 25a in the front-rear direction are portions that contact the switching valve 24, and the contact protrudes rearward from the center of the contact portion 25a. The tip of the contact portion 25b serves as a contact portion with the cam 26 described later, and a pivot pin 25c is provided at the base of the contact portion 25b (the front and rear center of the contact portion 25a).
Is swingably supported in the front-rear direction on the right side of the camera. The support hole 12d guides the swing of the contact portion 25b as a fan-shaped hole in plan view.

Then, as shown in FIG.
A ring-shaped recess 10c is provided on the left side surface of the OR, and cams 26 are fixed to the recess 10c with a set interval. This interval is the vertical swing angle θ1 about the first axis P, and as shown in FIG. 4, in the present embodiment, the swing is set at θ1 of about 160 °. Therefore, the swing angle can be changed by changing the mounting position of the cams 26 on the same circumference or by changing the width of the cams 26 in the circumferential direction. Further, a point symmetrical position with respect to the valve arm 25, that is, 18
A stopper is provided at a position shifted by 0 ° to form a stopper 27. The stopper 27 is provided so as to protrude from the right side surface of the gear case 12, and does not rotate in the opposite direction even when the switching valve 24 is switched by the valve arm 25. For example, when it is not possible to switch the valve arm 24, the stopper 27 abuts on the cam 26 to stop the swinging rotation, thereby preventing the valve arm 25 and the like from being damaged.

A bearing 28 is fixed to the shaft center of the gear case cover 21, and a drive shaft 29 is rotatably supported by the bearing 28 and the gear case cover 21. A water wheel 23 is fixed to the left end of the drive shaft 29. And it is arranged in the water supply chamber C. Drive shaft 2
A drive gear 30 is fixedly provided on the right side of the drive gear 9, and the drive gear 30 meshes with a reduction gear 31 at the left end of the reduction mechanism 9. As shown in FIG. 8, the reduction mechanism 9 has transmission shafts 33F and 33R suspended in parallel between the gear case lid 21 and the left side surface of the bearing case 10R, and the reduction gears are alternately provided on the transmission shafts 33F and 33R. .. And the final reduction gear 32 are loosely fitted and housed in the gear chamber B. The reduction gear 31.3
Reference numeral 2 denotes a double gear, and one of the front and rear large-diameter gears is arranged so as to mesh with the other small-diameter gear so that the driving force is sequentially reduced and the driving force is transmitted to the reduction gear 32.

A small-diameter gear of the final reduction gear 32 is a fixed gear 34 fixed to the shaft center on the left side surface of the bearing case 10R.
Is engaged. The fixed gear 34 is formed in a ring shape, and the right side is fixed to the left side of the bearing case 10R, and the upper half is exposed to the gear chamber B. That is, as shown in FIG. 6, the gear case 12 is provided with an opening 12e at the upper part of the partition wall 12b at the axis of the gear chamber B.
The right side surface of the gear chamber B is formed so as to protrude to the right side of the right side surface of the pressure chamber A, so that the upper half of the fixed gear 34 can be exposed in the gear chamber B.

With this configuration, when water is sent to the plug 17, the water is filtered by the strainer 20, enters the pressure chamber A, and is selected by the switching valve 24. Water enters one of the 22R and the discharge port 22Fa (or 22Ra) on that side.
More water blows toward the blades of the water turbine 23,
To rotate. This rotation is performed by the drive shaft 29 from the drive gear 3.
0, the reduction gear 31 is transmitted to the reduction gear 31.
And is transmitted to the reduction gear 32. Since the reduction gear 32 is engaged with the fixed gear 34, the reduction gear 32 tries to transmit the rotating power to the fixed gear 34. However, since the fixed gear 34 is fixed to the bearing case 10R, the rotating power is The swing case D (the gear case 12 and the sprinkler case 11) pivotally supported by the fixed-side bearing cases 10L and 10R is rotated about the first axis P.

Then, by turning upward or downward,
When rotating to the end of the set range (top dead center or bottom dead center), the contact portion 25b of the valve arm 25 contacts the cam 26,
The contact portion 25a is rotated, and the switching valve 24 is rotated, so that the open suction port 22Fb (2) of the water flow pipe 22F (22R) is opened.
1Rb) and close the other inlet 21Rb (22Fb)
Is opened, water is discharged from the other discharge port 21Ra (22Fa), and the water is blown out toward the opposite surface of the blade of the water wheel 23 to rotate the water wheel 23 in the reverse direction. By this reverse rotation, the swing case D is rotated in the opposite direction about the first axis P. In this manner, the valve is switched between the top dead center and the bottom dead center to change the rotation direction and reciprocate.

As shown in FIG. 5, FIG. 10, FIG. 11, and FIG. 12, a relief valve 35 is provided on the gear case lid 21 for partitioning between the pressure chamber A and the water supply chamber C. The valve 35 opens a through hole in the gear case lid 21,
The periphery of the through hole on the side of the water supply chamber C is formed in a valve seat,
The valve shaft 35a is inserted and urged by a spring 35c to form a valve body 35b.
Is seated on the valve seat and closed. In order to release the relief valve 35 so that the two chambers can communicate with each other, a release mechanism operable from outside is provided. In other words, the operating shaft 3 is
6, a pressure plate 37 is fixed in the pressure chamber A at the distal end of the operating shaft 36, and is disposed so as to be able to contact the distal end of the valve shaft 35a. The knob 38 is provided with a projection 38a, and the operation shaft 36 of the gear case 12 is fixed.
The pressing plate 37 has a boss 39 supporting the valve shaft 3.
The concave portion 39 is provided between a release position for pressing 5a and an operation position for not pressing.
The protrusion 38a is fitted into the concave portion 39a at each position so that the position can be maintained.

In such a configuration, the pressing plate 3
When the valve 7 is in the operating position away from the valve shaft 35a, the relief valve 35 maintains the pressure chamber A at the set pressure, discharges the pressurized water from the discharge port 22Fa or 22Ra, rotates the water wheel 23, and oscillates. The moving case D is made to oscillate, and when a water pressure higher than the set pressure is generated due to an abnormality of the pump or a water hammer, the valve body 35b is pushed open by the water pressure to flow directly from the pressure chamber A to the water supply chamber C. , To prevent damage due to pressure.

Then, a projection 38a of the knob 38 is externally provided.
Is rotated to a release position where it is fitted into the concave portion 39a, and the pressing plate 37 is maintained at a position pressed against the valve shaft 35a.
When the relief valve 35 is forcibly opened, the pressure difference between the pressure chamber A and the water supply chamber C disappears, and the discharge port 22Fa or 22
The water is not discharged from Ra, the water wheel 23 does not rotate, and the power is not transmitted to the rocking drive unit (the water wheel 23, the reduction mechanism 9 and the gear 34), the rocking is stopped, and the watering work can be performed.

During the sprinkling, the sprinkler 1
4 is required to be located at the top dead center (at positions other than the top dead center, the sprinkler 14 is inclined and
When rotated by 60 °, the liquid is discharged downward toward the ground), and a detent mechanism 40 is provided between the bearing case 10 and the swing case D. That is, as shown in FIG. 2, the bearing case 10L (10R) and the sprinkler case 11
(Gear case 12), the bearing case 1
A concave portion 40a into which the ball is fitted is formed on the inner peripheral surface of 0L,
The spring 40b and the ball 40c are arranged in the sprinkler case 11, and are arranged so that the ball 40c fits into the concave portion 40a in accordance with the position where the sprinkler 14 is located at the top dead center. However, this detent force is smaller than the torque for rotating the water wheel 23 and rotating the sprinkler case 11.

The upper portion of the sprinkler case 11 forms a concave portion 11a to form a plane for mounting the sprinkler 14. An insertion hole communicating with the water supply chamber C is opened at the center of the concave portion 11a. The base pipe 15 is screwed. In this way, the sprinkler 14 is arranged as close to the first axis P as possible, so that the moment of vertical swing is reduced.

Next, the structure of the sprinkler 14 is shown in FIG.
3 and FIG. A shaft 41a at the lower part of the main body 41 is rotatably fitted on the base pipe 15, and the shaft 41
a spring 42 is interposed on the main body 4.
1 is urged at a constant pressure so as not to rotate. A nozzle 16 is disposed in the middle of the main body 41 so as to be discharged to the side at a set angle above a horizontal plane.

Further, on the upper portion of the main body 41, a gate-shaped support portion 4 is provided.
1b, a pivotal shaft 41c coinciding with the second axis Q is provided at the center of the support portion 41, and a reaction arm 43 is rotatably supported on the pivotal shaft 41c. It is urged to rotate toward the nozzle 16 by a spring 47 fitted on the outer periphery, and is stopped by the support portion 41b. One end of the reaction arm 43 is extended to the outlet of the nozzle 16 and provided with a guide portion 43a for taking in a part of the liquid to be discharged and guiding it as shown by an arrow in FIG.
The weight 43b is fixed, and a contact portion 43c is formed below the weight 43b.

The restricting body 44 is pivotally supported by a pivot 48 projecting from the side of the main body 41, and a restricting plate 44a at one end (right side in FIG. 13) of the restricting body 44 is provided with a rotation restricting protruding from the side of the main body. The other end is inserted between the pins 50U and 50D.
3c extends downward. A lever arm 49 is further pivotally supported on the pivot shaft 48. A regulating rod 49a at one end of the lever arm 49 is inserted between the rotation regulating pins 50U and 50D. Switching lever 45
Is rotatably mounted and protruded downward, and pivotally supports a rod 51 at the other end of the lever arm 49.
The other side is slidably inserted into the regulating body 44, and a spring 52 is fitted between the regulating bodies 44 on the rod 51.

The cams 46.4 for setting a rotation angle on the upper surface of the concave portion 11a of the sprinkler case 11 on the rotation locus of the switching lever 45 about the second axis Q.
6 (FIG. 3) are provided. The cams 46 are provided on the same circumference around the axis Q as sprinkler cases 11.
On the upper plane, the switching lever 45 is fixed at a position where the switching lever 45 abuts, and sets the rotation angle (θ2) of the sprinkler 14. A long hole 46a is opened in the cam 46 and is fixed by a screw. The rotation angle can be changed by changing the fixing position of the long hole. By providing the cam 46 on the sprinkler case 11 side, the height of the sprinkler 14 can be kept low and close to the first axis P, and the inertia moment due to the own weight of the sprinkler 14 itself and the reaction force due to discharge can be reduced. ing.

In such a configuration, the switching lever 45
Is in the J position (FIG. 13), a part of the liquid discharged from the nozzle 16 hits the guide portion 43a, and the water pressure causes the reaction arm 43 to oppose the spring 47 in the direction of arrow M (4).
3 '). In this position, the position is not hit by the water discharged from the nozzle 16, so that the main body 41 is rotated back to the original position by the force of the spring 47, and the reaction arm 43 hits the support portion 41b and the main body 41 is turned in the N direction by the inertia force. Move. At this time, the main body 41 can be stably rotated by being braked by the spring 42 fitted to the shaft portion 41a. Then, since the guide portion 43a returns to the original position, the guide portion 43a is again rotated in the M direction by the water discharge pressure. This operation is repeated, and the main body 41 is gradually rotated rightward.

When the switching lever 45 is rotated in such a manner as to come into contact with the cam 46, the lever arm 49 comes into contact with the rotation regulating pin 50U, and the switching lever 45 stops at the K position. At this time, the regulating rod 49b is pivoted downward so that the rod 51 exceeds the dead center, and the urging force of the spring 52 causes the regulating body 44 to pivot upward and the regulating plate 44 at the other end.
a is rotated downward, abuts against the rotation restricting pin 50D, and stops. When the regulating body 44 pivots upward in this manner, the contact portion 43c of the reaction arm 43 comes into contact with the regulation body 44, and the reaction arm 43 cannot rotate in the M direction due to water discharge. The rotating force in the M direction can rotate the main body 41 in the M direction and rotate the sprinkler 14 in the opposite direction. When the switching lever 45 comes into contact with the cam 46 and is rotated from the K position to the J position, the regulating body 44 is rotated.
Is lowered, and the sprinkler 14 rotates in the N direction. Thus, the reciprocating rotation is repeated. When the switching lever 45 is rotated to the H position, the switching lever 45 cannot contact the cam 46 and does not reverse. Therefore, the switching lever 45 rotates only in the same direction, and rotates the knob 38 to release the relief valve. By opening 35 and fixing the sprinkler 14 in the vertical position, watering work can be performed.

[0030]

As described above, the present invention has the following advantages. That is, a liquid discharge unit is arranged on a swinging case, the swinging case is configured to be able to swing up and down at a set angle, and a drive unit that is driven to rotate by water pressure is arranged in the swinging case. The swing case is driven to swing by force, and a relief valve is attached to the swing case. Therefore, even if abnormally high pressure water is sent or a water hammer or the like is generated, a relief valve is provided. To prevent the swing drive unit and the main body from being damaged.

Further, since the relief valve is arranged between the pressure chamber for storing the pressurized water in the swinging case and the water supply chamber for supplying the liquid to the liquid discharge section, the water pressure discharged from the pressure chamber is kept constant.
The swing drive is kept constant, the swing does not fluctuate, and the relief liquid is discharged to the water supply chamber, so that the liquid is not wasted and the liquid is not scattered outside.

Further, since the relief valve is provided with a release mechanism, and the release mechanism is configured to be operable from outside the swing case, it can be easily operated from the outside, and when the relief valve is forcibly released, the pressure chamber is released. The pressure difference between the water and the water supply chamber disappears, the water wheel stops rotating, the swing drive is stopped, the vertical rotation of the water discharge section is stopped, and water sprinkling work can be performed, and the vertical and horizontal swing drive This makes it possible to easily switch between the controlling operation and the watering operation performed by swinging only in the left-right direction by an external operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing a state in which a pest control operation is being performed using a portable oscillating water sprinkler.

FIG. 2 is a front sectional view of a portable oscillating water sprinkler.

FIG. 3 is a plan view of the same.

FIG. 4 is a side view of the same.

FIG. 5 is a sectional view taken along the line UU in FIG. 2;

FIG. 6 is a sectional view taken along the line VV in FIG. 2;

FIG. 7 is a sectional view taken along line WW in FIG.

8 is a sectional view taken along the line XX in FIG.

FIG. 9 is a sectional view taken along the line YY in FIG. 2;

FIG. 10 is a bottom view showing a release knob portion of the relief valve.

FIG. 11 is a bottom sectional view of the same.

FIG. 12 is a view as viewed in the direction of the arrow Z in FIG. 11;

FIG. 13 is a front view of the sprinkler.

FIG. 14 is a plan view of the same.

[Explanation of symbols]

 Reference Signs List A pressure chamber C water supply chamber D swing case 9 reduction mechanism 23 water turbine 35 relief valve 36 operation shaft 38 knob

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihisa Ono 1-32 Chayacho, Kita-ku, Osaka-shi, Osaka Inside Yanmar Agricultural Machinery Co., Ltd. (72) Inventor Shigeyoshi Yamashita 4-2-2 Nishinakajima, Yodogawa-ku, Osaka-shi No. 21 in Kyoritsu Metal Industry Co., Ltd. (72) Inventor Takashi Okuma 4-2-1, Nishinakajima, Yodogawa-ku, Osaka

Claims (3)

[Claims] 1. A liquid discharging section is arranged on a swing case, the swing case is configured to be able to swing at a set angle in a vertical direction, and a drive section that is driven to rotate by a water flow is arranged in the swing case. ,
With this driving force, the swing case is driven to swing,
An oscillating water spray control device, wherein a relief valve is attached to the oscillating case. 2. A pressure chamber for storing pressurized water in the oscillating case and a water supply chamber for supplying water to a liquid discharge section are provided, and the relief valve is disposed between the pressure chamber and the water supply chamber. The swing sprinkler according to claim 1. 3. The swing sprinkler according to claim 2, wherein a release mechanism is provided on the relief valve, and the release mechanism is configured to be operable from outside the swing case.