JP3425662B2 - Pressure regulating valve - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulating valve for adjusting the discharge pressure of a pump, and more particularly to a pressure regulating valve for performing a wide range of pressure control from low pressure control work to high pressure cleaning work.

[0002]

2. Description of the Related Art When performing a low pressure control work and a high pressure cleaning work with the same pump, it is necessary to set the discharge pressure suitable for each. In the normal pump discharge pressure setting, low pressure control work is performed by the pressure control valve, and high pressure cleaning work is performed by the unloader in addition to the pressure control valve.

On the other hand, Japanese Utility Model Publication No. 6-7238 discloses a pressure regulating valve in which the pressure regulating value can be changed from low pressure spraying to medium pressure weeding to high pressure cleaning by rotating the grip portion. In this pressure regulating valve, a groove is provided corresponding to each predetermined pressure regulating value, and during rotation of the grip portion, a ball is partially inserted into each groove as appropriate, and rotation of the grip portion is lightly locked, The setting for each pressure adjustment value is simplified.

Japanese Utility Model Laid-Open No. 60-102558 also discloses a pressure regulating valve in which the pressure regulating value is changed by the rotation of the grip portion. In this pressure regulating valve, the guide shaft is rotated as the grip portion rotates. Sliding in the cam groove, and the step portion is appropriately provided in the cam groove, and when the guide shaft is fitted into each step portion, the rotation of the grip portion is lightly locked, and it is easy to set each pressure adjustment value. It has been adapted.

[0005]

The operator sets the pressure adjustment value to 0 at the time of starting the pump, and after the start, increases the pump discharge pressure to the pressure adjustment value according to the work. When it is possible to regulate the pump discharge pressure from the low-pressure control work to the high-pressure cleaning work by rotation, the worker should normally gradually rotate the rotating member or stop it at the intermediate pressure adjustment value. In spite of this, the pressure adjustment value may unnecessarily suddenly become a high pressure for cleaning due to rapid rotation or the like, which is not preferable.

An object of the present invention is to provide a pressure regulating valve which can overcome the above problems.

[0007]

The pressure regulating valve (26) of the present invention has the following (a) to (h). (A) A valve body (46) that opens and closes to control the connection between the residual liquid port (28) and the pressure regulating port (38) (b) A valve body biasing force that biases the valve body (46) in the closing direction Member (52) (c) Body (36, 44) for accommodating valve body (46) and valve body biasing member (52) inside (d) Body body (36, 44) Rotating member (54) for increasing / decreasing the preload of the valve biasing member (52) by advancing and retreating due to rotation (e) A locked body provided on one of the body body (36, 44) and the rotating member (54) (60) (f) Radial urging member (62) for urging the locked body (60) in the radial direction (g) Relative rotation of the body body (36, 44) and the rotating member (54) in the relative rotating direction. When the position of the locking body (60) matches the locked body (60)
Body body (36,44) and rotating member (54) so as to lock the body body (36,44) and rotating member (54) in the relative rotation direction.
(7) Locking part provided on the other side (h) Locked body against the biasing force of the radial biasing member (62)
An unlocking member (78) for releasing the (60) from the locking part (74) and unlocking the locked body (60) by the locking part (74)

The valve body (46) is opened and closed by the relationship between the urging force of the valve body urging member (52) and the hydraulic force of the pressure regulating port (38), and the hydraulic pressure of the pressure regulating port (38) is opened. Is controlled to a pressure adjustment value corresponding to the preload of the valve body biasing member (52). When changing the pressure adjusting value of the pressure adjusting valve (26), the rotating member (54) is rotated relative to the body body (36, 44). The locked body (60) slides on the other of the body body (36, 44) and the rotating member (54) while being biased in the radial direction by the radial biasing member (62). The locked body (60) is a locking portion in the relative rotation direction of the body body (36, 44) and the rotating member (54).
When it reaches the position of (74), it is locked by the locking portion (74), and the relative rotation of the body body (36, 44) and the rotating member (54) is restricted. When releasing this restraint and restarting the relative rotation of the body (36, 44) and the rotating member (54),
(78) is operated to lock the locked body (60) in the radial direction (62).
It is disengaged from the locking portion (74) against the urging force of. In this way, the relative rotation of the rotating member (54) with respect to the body body (36, 44) is interrupted by the locking of the locked body (60) by the locking portion (74), so that the pressure adjustment value is inadequate. It is possible to prevent a large value from being set at once.

The number of the engaging portions (74) is not limited to one. Properly provided in the relative rotation direction of the rotating member (54) with respect to the body body (36, 44), the plurality as a whole, the body body (36, 44)
It is also possible to provide a plurality of interruption positions for relative rotation of the rotating member (54).

According to the pressure regulating valve (26) of the present invention, the locked body
Reference numeral (60) is a ball (60), and the locking portion (74) is a fitting hole (74).

According to the pressure regulating valve (26) of the present invention, the body (36, 36) in the direction of decreasing the preload of the valve body biasing member (52).
A guide portion (90) for guiding the ball (60) from the inside of the fitting hole (74) to the outside with respect to the relative rotation of the rotation member (44) and the rotation member (54) is provided in the unlocking member (78).

In the relative rotation of the body (36, 44) and the rotating member (54) in the direction of increasing the preload of the valve biasing member (52), the ball (60) is inserted into the fitting hole (74). The lock is released by the lock releasing member (78) in order to be fitted and locked and to restart the relative rotation. On the other hand, in the relative rotation of the body body (36, 44) and the rotating member (54) in the direction in which the preload of the valve body biasing member (52) is reduced, the ball (60) is inserted into the insertion hole ( Despite the insertion into the 74), the guiding portion (90) guides it to the outside of the insertion hole (74), and the ball (60) is not locked by the insertion hole (74). In this way, when the pressure regulation value is reduced, the pressure regulation value can be reduced without operating the locking release member (78).

According to the pressure regulating valve (26) of the present invention, the stopper (94) and the stopper (94) for restricting the relative rotation of the body body (36, 44) and the rotating member (54) against each other in the relative rotation direction. Protrusion
(96) is provided, and the relative rotational positions of the body body (36, 44) and the rotating member (54) when the stopper (94) is in contact with one side surface and the other side surface of the protrusion (96) respectively adjust the pressure. It corresponds to the minimum and maximum values.

Rotating member (54) with respect to the body (36, 44)
The rotation of is limited to almost one rotation, and within this one rotation, the pressure regulating valve
It is possible to set the entire range of pressure regulation value by (26).

According to the pressure regulating valve (26) of the present invention, the ball (6
0) and the fitting hole (74) are provided in the body body (36, 44) and the rotating member (54), respectively. The inner peripheral surface of the rotating member (54) is provided with a plurality of recesses (70) having an arcuate cross section into which the balls (60) are fitted at appropriate intervals in the circumferential direction of the rotating member (54).

When the ball (60) is fitted into the recess (70), the ball (60) is removed from the recess (70), so that the body (36,
The relative rotational force of 44) and the rotating member (54) increases. Recess (7
By associating 0) with the predetermined pressure adjustment value of the pressure adjustment valve (26), it becomes easy to change the pressure adjustment valve (26) to the predetermined pressure adjustment value.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 12, FIG. 13, and FIG. 14 are a front view, a plan view, and a right side view of the power pump set 10 used for work from control to cleaning. The frame 12 is made of a pipe and has a plurality of vibration isolator 14 at the lower side.
And is placed on the ground with the vibration isolator 14 interposed. The engine 16 is mounted and fixed on the lower side of the frame 12, and is supplied with fuel from a fuel tank 18 on the upper side. The reciprocating pump 20 is fixed to the vertical side portion of the frame 12 on one side, fixed to the engine 16 on the other side, and receives rotational power from the engine 16. Reciprocating pump
The suction port 22 and the discharge port 24 of 20 are opposite in the horizontal direction, and a suction hose and a discharge hose are attached thereto, respectively. The pressure regulating valve 26 is provided in the vicinity of the discharge port 24 and has a residual liquid port 28 for discharging the residual liquid.

FIG. 1 is a detailed vertical sectional view of the pressure regulating valve 26. The pressure regulating valve connection pipe 34 is interposed between the reciprocating pump 20 and the discharge port 24 and guides the discharge liquid from the reciprocating pump 20 to the discharge port 24. The body 36 is attached to the upper part of the pressure regulating valve connecting pipe 34 at the lower end thereof so that the pressure regulating port 38 faces the inside of the pressure regulating valve connecting pipe 34 and the residual liquid port 28 is opened in the horizontal direction. Body 36
Inside the valve, the valve seat 40 and the cylinder
42 is inserted, and the guide 44 is screwed onto the inner peripheral portion of the body 36 to press the valve seat 40 and the cylinder 42 against the stepped portion of the body 36. The guide set screw 45 is installed from the outside of the body 36.
The guide 44 is screwed into the wall portion of the guide 36, and the peripheral portion of the guide 44 is pressed inward in the radial direction at the tip end thereof to prevent the guide 44 from rotating with respect to the body 36. The valve body 46 is fitted with a seal packing 48, is slidable in the seal packing 48 on the inner peripheral surface of the cylinder 42 in the axial direction, and sits on the valve seat 40 at a position on the valve seat 40 side. The washer 50 is slidably arranged in the guide 44 in the axial direction of the guide 44, and the compression coil spring 52 is provided between the valve body 46 and the washer 50 in a contracted manner. The grip 54 is screwed into the thread groove 55 on the outer circumference of the guide 44 at the thread groove 57 on the inner circumference side. The inserter nut 56 is attached to the end wall portion of the grip portion 54, the bolt 58 is screwed into the inserter nut 56, abuts the washer 50 at the tip of the shaft portion, and the head is attached to the end surface portion of the grip portion 54. Exposed.

When the force acting on the valve element 46 from the hydraulic pressure of the pressure adjusting port 38 is lower than the urging force from the compression coil spring 52 to the valve element 46, the valve element 46 is urged by the compression coil spring 52. As a result, the valve seat 40 is seated, the pressure adjusting port 38 is disconnected from the residual liquid port 28, and the liquid pressure of the pressure adjusting port 38 is maintained. On the other hand, the force acting on the valve body 46 from the hydraulic pressure of the pressure adjusting port 38 is the compression coil spring.
When the biasing force from 52 to the valve element 46 is exceeded, the valve element 46 will move to the valve seat 40.
Away from the pressure control valve connection pipe 34, a part of the liquid in the pressure control valve connection pipe 34 is discharged from the residual liquid port 28, and the liquid pressure in the pressure control valve connection pipe 34 decreases. In this way, the hydraulic pressure in the pressure regulating valve connecting pipe 34 is maintained at the pressure regulating value corresponding to the preload of the compression coil spring 52.

When the pressure adjustment value of the pressure adjusting valve 26, that is, the preload of the compression coil spring 52 is changed, the grip portion 54 is gripped and the grip portion 54 is rotated with respect to the body 36. This makes the thread groove
The screwing positions of 55 and 57 change, and the grip portion 54 changes the axial position with respect to the body 36. As a result, the distance between the valve body 46 and the washer 50 changes, and the preload of the compression coil spring 52 changes,
The pressure regulating value of the pressure regulating valve 26 changes. When finely adjusting the pressure adjustment value, turn the head of the bolt 58, and the bolt 58
It rotates with respect to the insert nut 56 and moves relative to the grip 54 in the axial direction of the grip 54, so that the preload of the compression coil spring 52 is slightly changed.

In FIG. 1, the ball 60 and the compression coil spring 62 are disposed in a radial through hole formed in the wall portion of the body 36 at a predetermined circumferential position around the center line of the residual liquid port 28, The ball 60 is pressed against the inner surface of the thin portion 72 at the tip of the grip portion 54 by the biasing force of the compression coil spring 62. The ring 68 is fitted on the outer surface side of the thin portion 72.

FIG. 2 is a view of the grip 54 seen from the opening side, and FIG.
Is the grip 54 when the upper half is a cross section and FIG. 2 is a front view.
2 is a left side view, and FIG. 4 is a side view of the grip 54 seen from the direction in which the square hole 74 of FIG. 2 is on the center line. 1 in FIG.
A total of nine bow-shaped grooves 70 except the uppermost bow-shaped groove 70 are formed on the inner surface of the thin portion 72 at intervals of 33 °. The top bow-shaped groove 70 and the bow-shaped grooves 70 on the left and right in the circumferential direction are each 30 °.
And 66 ° apart. All arcuate grooves 70 extend axially of the grip 54. The square hole 74 is formed so as to penetrate the thin portion 72 at the position of the sixth arc-shaped groove 70 located from the uppermost arc-shaped groove 70 in FIG.

FIG. 5 shows a state where the ball 60 is fitted in the arcuate groove 70. The arcuate groove 70 has an arcuate cross section that is smaller than the semicircle of the ball 60. The position of each arcuate groove 70 in the circumferential direction of the grip 54 corresponds to each predetermined pressure adjustment value of the pressure regulating valve 26, and when the grip 54 is rotated with respect to the body 36,
When the ball 60 reaches the position corresponding to each arcuate groove 70 in the circumferential direction, the ball 60 is partially fitted into the arcuate groove 70 by the radial outward biasing force of the compression coil spring 62. In order for the ball 60 to slip out in the rotational direction of the grip 54, a radially inward force that opposes the biasing force of the compression coil spring 62 is required. Therefore, when the ball 60 is released from the arcuate groove 70,
Since the rotational operation force of 54 will increase, each bow-shaped groove
It becomes easy to set each pressure adjustment value corresponding to 70.

FIG. 6 is a view of the assembled body of the grip portion 54 and the ring 68 as seen from the opening side of the grip portion 54, and FIG. 7 is a left side view when FIG. 6 is a front view. 8 is a side view of the assembly of the grip portion 54 and the ring 68 of FIG. 6 seen from the direction in which the through hole 92 is on the center, FIG. 9 is an enlarged view of the range of the square hole 74 of FIG. 6, and FIG. 9 is a perspective view of a push rod 78. FIG. The circular hole 76 is formed at a predetermined position of the ring 68, and the ring 68 is fitted to the thin portion 72 of the grip portion 54 so that the circular hole 76 circumferentially overlaps the square hole 74 of the grip portion 54. The push rod 78 includes a column portion 86 and a regular square column portion 88 that is continuous with the column portion 86. The end surface of the regular square pole portion 88 is a curved surface 90, and the curved surface 90 is a curved surface from the cylindrical portion 86.
It is formed so that the distance to 90 gradually increases from one side of the regular square column portion 88 to the opposite side thereof. The column portion 86 and the regular square column portion 88 have the same dimensions as the circular hole 76 and the square hole 74, respectively.
They have the same contour, and the column portion 86 is an inscribed circle of the regular square column portion 88, that is, the diameter of the column portion 86 is equal to one side of the regular square column portion 88. The push rod 78 is inserted into the square hole 74 from the inner peripheral side of the grip portion 54, and the cylindrical portion 86 penetrates the circular hole 76 and is exposed to the outside of the ring 68 in the radial direction. The spring seat 80 is fitted on the exposed end portion of the push rod 78 from the ring 68, and is fixed to the push rod 78 by a screw 82. The compression coil spring 84 is fitted into the columnar portion 86, contacts both ends of the outer peripheral surface of the ring 68 and the spring seat 80, and urges the push rod 78 radially outward. Since one side of the regular square column portion 88 is equal to the diameter of the column portion 86, and thus the circular hole 76, the regular square column portion 88 is prevented from entering the circular hole 76. 6 and 7, A and B indicate the directions of rotation of the grip portion 54 and the ring 68 with respect to the body 36, and correspond to the increasing direction and the decreasing direction of the pressure regulating value of the pressure regulating valve 26, respectively. Curved surface 90 is A rather than B side
It is formed so as to project inward in the radial direction on the side.
The through-holes 92 are formed only at the bisectors of the two arcuate grooves 70 having an interval of 30 °. When the ball 60 is in the rotational position of the square hole 74, the pressure regulating valve 26 corresponds to the pressure regulating value corresponding to the spray, and when the ball 60 is in the rotational position on both sides of the through hole 92 in the circumferential direction, the pressure regulating valve 26 Corresponds to the regulated value 0 at the start of the reciprocating pump 20 and the maximum regulated value for cleaning.

FIG. 11 is a transverse sectional view showing a structure for limiting the rotation range of the grip portion 54 with respect to the body 36. Screw 94
It is inserted into the through hole 92 of the ring 68, is screwed into the screw hole of the grip portion 54, and protrudes from the inner peripheral surface of the grip portion 54 toward the body 36. The protrusion 96 protrudes outward in the radial direction and can come into contact with the screw 94 in the rotational direction of the grip 54 with respect to the body 36. The directions A and B in FIG. 11 are the same as those in FIGS. 6 and 7, and correspond to the direction in which the pressure regulating value of the pressure regulating valve 26 is increased or decreased with respect to the rotation direction of the grip 54 with respect to the body 36. The screw 94 abuts on one side surface and the other side surface of the protrusion 96 of the body 36, thereby restricting the rotation of the grip portion 54 with respect to the body 36. As a result, the rotation of the grip portion 54 with respect to the body 36 is limited to about one rotation, and when the screw 94 is in contact with one and the other side surfaces of the protrusion 96, the pressure regulating valve.
The pressure regulation value of 26 corresponds to 0 (= starting) and the maximum pressure (cleaning).

When the reciprocating pump 20 is started, the pressure regulating value of the pressure regulating valve 26 is set to zero. With the start of the reciprocating pump 20, the grip 54
Is rotated in the direction of A with respect to the body 36. The ball 60 slides on the inner surface of the grip 54 in the circumferential direction, and the rotational operation force of the body 36 is slightly increased each time the ball 60 is fitted into each arcuate groove 70. When the square hole 74 of the grip 54 comes to the position of the ball 60,
Is fitted into the square hole 74 by almost half, and the side wall of the square hole 74 abuts on the ball 60 in the A direction, so that the grip portion in the A direction is
The rotation of 54 is blocked. At this time, the pressure regulating value of the pressure regulating valve 26 becomes almost the maximum pressure of the spraying work. Regular square column 88, circular hole 76
The end is abutted against the inner end in the radial direction of, and does not enter the circular hole 76. To restart the rotation of the grip 54 in the A direction,
Push the push rod 78 inward in the radial direction,
60 is removed from the square hole 74 by a push rod 78.

When the pressure adjustment value is reduced from the value at the time of cleaning work, the body 36 is rotated in the B direction. When the square hole 74 reaches the position of the ball 60, the ball 60 enters the square hole 74. However, since the end of the curved surface 90 on the A side is almost continuous with the inner peripheral surface of the grip portion 54, For rotation in the B direction, the ball 60 exits the square hole 74 in the A direction by guiding the curved surface 90 without contacting the side wall of the square hole 74. Therefore, in the rotation of the grip 54 when reducing the pressure regulation value,
The pressure regulation value can be reduced to 0 without interrupting the rotation in the middle.

[Brief description of drawings]

FIG. 1 is a detailed vertical sectional view of a pressure regulating valve.

FIG. 2 is a view of a grip portion viewed from the opening side.

FIG. 3 is a left side view of the grip when the upper half is taken as a cross section and FIG. 2 is a front view.

FIG. 4 is a side view of the grip portion viewed from the direction in which the square hole of FIG. 2 is on the center line.

FIG. 5 is a view showing a state in which a ball is fitted in the bow-shaped groove.

FIG. 6 is a view of the assembled body of the grip portion and the ring as viewed from the opening side of the grip portion.

FIG. 7 is a left side view when FIG. 6 is a front view.

FIG. 8 is a side view of the assembled body of the grip portion and the ring of FIG. 6 as viewed from the direction in which the through hole is on the center.

FIG. 9 is a perspective view of a push rod.

FIG. 10 is a perspective view of a push rod.

FIG. 11 is a cross-sectional view showing a structure for limiting the rotation range of the grip portion with respect to the body.

FIG. 12 is a front view of a power pump set used for work from control to cleaning.

FIG. 13 is a plan view of a power pump set used for operations from control to cleaning.

FIG. 14 is a right side view of a power pump set used for work from control to cleaning.

[Explanation of symbols]

26 Regulator 28 Spill port 36 body (body itself) 38 Pressure regulator 44 guide (body) 46 valve body 52 Compression coil spring (biasing member for valve body) 54 Grip (rotating member) 60 balls 60 balls (locked body) 62 Compression coil spring (radial urging member) 70 Bow-shaped groove (recess) 74 Square hole (locking part, fitting hole) 78 Push rod (lock release member) 90 Curved surface (guidance part) 94 screw (stopper) 96 protrusions

Continuation of the front page (56) References Japanese Patent Laid-Open No. 7-20946 (JP, A) Actual Opening 1-94681 (JP, U) Actual Opening 59-187553 (JP, U) Actual Public Opening 6-7238 (JP , Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) G05D 16/10 F16K 17/06

Claims (5)

(57) [Claims] 1. (a) Open and close to open a residual liquid port (28) and a pressure adjusting port (38).
Valve body (46) for controlling connection with the valve body, (b) valve body biasing member (52) for biasing the valve body (46) in the closing direction, (c) the valve body (46) and the valve body Body for accommodating the urging member (52) inside
(36,44), (d) A rotating member (54), which is connected to the body body (36, 44) by screwing and increases or decreases the preload of the valve member biasing member (52) by advancing and retracting due to rotation. e) The body body (3
6,44) and a locked body (60) provided on one of the rotating member (54), (f) a radial biasing member (62) for biasing the locked body (60) in the radial direction. ), (G) The body body (36,
44) and the rotating member (54) relative to each other in the rotational direction of the locked body (60) when the position of the locked body (60) the body (36, 44) and the rotary member ( A locking portion (74) provided on the other of the body (36, 44) and the rotating member (54) so as to lock in the relative rotation direction of (54), and (h) the radial biasing member. The locked body against the biasing force of (62)
An unlocking member (7) for releasing (60) from the locking part (74) to unlock the locked body (60) by the locking part (74).
8), A pressure regulating valve characterized by having. 2. The locked body (60) is a ball (60),
The pressure regulating valve according to claim 1, wherein the locking portion (74) is a fitting hole (74). 3. The body body (36, 44) and the rotating member in a direction to reduce a preload of the valve body biasing member (52).
The ball (60) is inserted into the insertion hole (7
4) The guide portion (90) for guiding the inside to the outside is provided with the locking release member (7).
The pressure regulating valve according to claim 2, which is provided in 8). 4. A stopper (94) and a protrusion (96) for limiting the relative rotation of the body body (36, 44) and the rotating member (54) by mutually abutting each other in the relative rotation direction, The relative rotational positions of the body body (36, 44) and the rotating member (54) when the stopper (94) is in contact with one side surface and the other side surface of the protrusion (96) respectively have the minimum pressure adjustment value. The pressure regulating valve according to any one of claims 1 to 3, which corresponds to a value and a maximum value. 5. The ball (60) and the fitting hole (74) are provided in the body body (36, 44) and the rotating member (54), respectively, and an inner peripheral surface of the rotating member (54) is provided. The adjustment according to claim 2 or 3, wherein a plurality of recesses (70) having an arcuate section into which the balls (60) are fitted are provided at appropriate intervals in the circumferential direction of the rotating member (54). Pressure valve.