JPH11167421A - Fluid pressure regulator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a screw thread from being damaged when a pressure adjust screw is rotated after a spring receiver is detached from the screw part of the pressure adjust screw without increasing man-hours and the number of parts. SOLUTION: In this fluid pressure regulator, a spring receiver sliding part 21b which slidably touches the screw hole 22 of the spring receiver 15 in the detached state from engagement with the screw part 21a without being engaged with the hole is formed at the tip side compared to the screw part 21a of the pressure screw 14. The spring receiver sliding part 21b has a tapered shape with the taper angle α of about 5-30 deg., which becomes thinner toward the tip side from the base part side of the pressure screw 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure regulator for regulating the pressure of a fluid such as compressed air.

[0002]

2. Description of the Related Art As a conventional air pressure regulator, FIG.
There is a configuration as shown in FIG. The pneumatic regulator includes a handle 2 rotatably mounted on an upper part of a main body 1.
A spring receiver 4 screwed to a pressure adjusting screw 3 fixed to the handle 2, a diaphragm 5 disposed in the main body 1 so as to face the spring receiver 4, and the spring receiver 4 and the diaphragm 5. And a pressure adjusting coil spring 6 interposed therebetween.

In such a diaphragm type, by operating the handle 2 to rotate the pressure adjusting screw 3 in the normal and reverse directions, the spring receiver 4 is moved up and down along the pressure adjusting screw 3 so that the pressure adjusting coil spring is moved. Diaphragm 5 by 6
Is adjusted, thereby adjusting the set pressure on the secondary side.

When the pressure adjusting screw 3 is continuously rotated so as to increase the set pressure on the secondary side, as shown in FIG. 6, the spring receiver 4 is moved from the distal end (the lower end in the figure) of the pressure adjusting screw 3. You will come out.

When the spring receiver 4 comes off from the pressure adjusting screw 3,
The spring receiver 4 is pressed against the distal end of the pressure adjusting screw 3 by a biasing force from the pressure adjusting spring 6 in a state where the spring receiver 4 is not screwed into the screw portion 3 a formed on the pressure adjusting screw 3. Become. In addition, since the pressure adjusting spring 6 has a large elastic force enough to increase and decrease the set pressure of the diaphragm 5, the pressure adjusting spring 6 is pressed against the distal end of the pressure adjusting screw 3. When the screw 3 is further rotated, a portion on the tip end side of the screw portion 3a rubs against the spring receiver 4 and is damaged.
Thereafter, there was a drawback that the spring receiver 4 and the screw portion 3a did not screw together, resulting in malfunction.

Therefore, as shown in FIG. 7, the lower end 7 'of the pressure adjusting screw 7 is crushed in advance so that the spring receiver 8 does not come off from the pressure adjusting screw 7.
As shown in FIG. 8, a nut 10 is screwed onto the lower end of the pressure adjusting screw 9 so that the spring receiver 11 does not come off.
Furthermore, as described in Japanese Utility Model Publication No. 64-7371, a pressure adjusting screw provided with a stop ring at the lower end thereof has been proposed.

[0007]

However, if the lower end 7 'of the pressure adjusting screw 7 itself is crushed, the number of man-hours for the lowering is increased, and the nut 10 is screwed onto the lower end of the pressure adjusting screw 9. With a fixed one, the man-hour increases and the cost increases. In addition, with a stop ring attached to the lower end of the pressure adjusting screw, a mounting groove is formed in the pressure adjusting screw,
In addition, there are disadvantages that the man-hour for mounting the stop ring is increased and the cost is increased, and the strength is insufficient when the stop ring is simply mounted on the pressure adjusting screw.

Therefore, the present invention prevents damage to the screw portion of the pressure adjusting screw even when the pressure adjusting screw is further rotated after the spring receiver is detached from the screw portion without increasing the number of steps or the number of parts. It is intended to provide a fluid pressure regulator that can be used.

[0009]

The fluid pressure regulator according to the present invention is arranged such that the pressure adjusting screw 14 has a tip portion closer to the tip than the threaded portion 21a.
A spring receiving sliding contact portion 21b is formed, which comes into sliding contact with the screw hole 22 of the spring receiver 15 in a state detached from the screw engagement with the screw portion 21a without being screwed.
b has a taper shape having a taper angle α of approximately 15 ° to 30 °, which becomes thinner from the base end side to the tip end side of the pressure adjusting screw 14. Note that the taper angle α is preferably 20 °. The screw threaded end 23a side of the screw hole 22 of the spring receiver 15 is formed with the same taper angle α as the spring receiver sliding contact part 21b.

[0010]

Embodiments of the present invention will be described with reference to the drawings. The pneumatic regulator shown in FIG. 1 includes a body 12, a cap-shaped handle 13 rotatably mounted on the body 12, a pressure adjusting screw 14 fixed to the handle 13, and a screw hole 22 in the pressure adjusting screw 14. A spring receiver 15 to be screwed in, a diaphragm 16 arranged so as to partition a diaphragm chamber A in the main body 12, and a relief valve body 17 fixed to the center of the diaphragm 16 and the spring receiver 15 are interposed. Pressure adjusting coil spring 1
8, the primary flow path 12a and the secondary flow path 12b formed in the lower part of the main body 12 according to the elastic deformation of the diaphragm 16.
And a valve 19 for opening and closing a communication flow path for communicating

The pressure adjusting screw 14 has a fixing portion 20 fixed to the handle 13 at a base end side and a spring receiving moving portion 21 at a distal end side with a flange portion 14a projecting and formed at an intermediate portion as a boundary. .

As shown in FIG. 2, the spring receiving moving portion 21 has a screw portion 21a formed on the base end side and a spring receiving sliding contact portion 21b formed on the distal end side. Screw part 2
1a is formed to have a constant diameter, so that the spring receiver 15 fitted thereto can be moved along the forward / reverse rotation of the pressure adjusting screw 14 in accordance therewith.

The spring receiving sliding contact portion 21b is adapted to be in sliding contact with the screw hole 22 of the spring receiving member 15 which has been detached from the screw engagement with the screw portion 21a without being screwed. Almost 2 with 21a thread pitch
The pressure adjusting screw 14 is formed in a tapered shape that is formed in a range of about the pitch and becomes thinner from the base end side to the tip end side of the pressure adjusting screw 14. The taper angle α of the spring receiving sliding contact portion 21b is set in a range of approximately 15 to 30 °, preferably 20 °.

When a thread is formed on a bar formed by forming the portion to be the spring receiving sliding contact portion 21b into a tapered shape having the taper angle α, the peak of the thread is formed at the spring receiving sliding contact portion 21b at an acute angle. Only the roots between the threads are gradually formed shallower from the base end side toward the tip end side. In other words, only the valley bottom between the screw threads is gradually formed shallow while the original peripheral surface of the spring receiving sliding contact portion 21b is left in a spiral band shape. Reference numeral 21c denotes a projecting portion protruding from the tip end side of the spring receiving sliding contact portion 21b, and has a cylindrical shape smaller in diameter than the screw portion 21a.

The spring receiver 15 is provided with the screw portion 2 of the pressure adjusting screw 14.
A cylindrical portion 2 formed around a screw hole 22 that can be screwed into 1a
A flange 23b abutting on the upper end of the pressure-adjusting coil spring 18 is formed so as to protrude from the periphery of the third screw-in end 23a. Also, the screw threaded end 23a side of the screw hole 22 is
The taper angle α corresponding to the spring receiving sliding contact portion 21b is formed.

The operation of the air pressure regulator having the above configuration will be described. When the handle 13 is rotated so as to increase the set pressure of the diaphragm 16, the spring receiver 15 screwed to the screw portion 12a is screwed toward the tip of the pressure adjusting screw 14 as shown in FIG. As the screw advances, the urging force of the pressure adjusting coil spring 18 against the diaphragm 16 increases.

The handle 13 is connected to the pressure adjusting coil spring 1
8 continues rotating in the direction in which the urging force of the diaphragm 8 against the diaphragm 16 increases, as shown in FIG.
After detaching from the screw portion 21 a of the pressure adjusting screw 14, the pressure adjusting screw 14 is in a state of being slid on the spring receiving sliding contact portion 21 b while being biased by the pressure adjusting coil spring 18. That is, in this state, the screw hole 22 of the spring receiver 15 and the screw portion 21a of the pressure adjusting screw 14 are not in contact.

Therefore, even when the pressure adjusting screw 14 is rotated in the sliding contact state, the spring receiver 15 and the spring receiving sliding contact portion 21b relatively slide and rotate, and the pressure adjusting screw 14 is formed. The screw portion 21a is not damaged.

In order to reduce the set pressure of the diaphragm 16 from the state where the spring receiver 15 is in sliding contact with the spring receiving sliding portion 21b, the spring receiver 15 is screwed toward the base end of the pressure adjusting screw 14. The handle 13 is rotated in the direction.

Due to the rotation, the spring receiver 15, which has been in sliding contact with the spring receiving sliding portion 21b, gradually starts screwing into the screw portion 21a, and the urging force of the pressure adjusting coil spring 18 against the diaphragm 16 according to the subsequent screwing. Is reduced. As a result, the set pressure of the diaphragm 16 can be reduced.

After the spring receiver 15 is separated from the screw part 21a as described above, the spring receiving sliding contact part 21b is
4 is allowed to rotate in the sliding direction without screwing with the spring receiver 15, while the pressure adjusting screw 14 is rotated in the pressure decreasing direction, and the screw portion 21a and the screw hole 22 are rotated. It becomes a guide to smooth the screwing again. According to experiments, when the taper angle α was set to 20 °, such a 2
Two actions were performed effectively.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the invention. In the above description, compressed air has been described as an example of the fluid, but the present invention can be applied even when the fluid is a liquid such as oil.

[0023]

According to the first to fourth aspects of the present invention, the pressure adjusting screw is screwed into the screw hole of the spring receiver separated from the screwing with the screw portion on the tip side from the screw portion. A spring receiving sliding contact portion that slides without contact is formed, and the spring receiving sliding contact portion is formed in a tapered shape that becomes thinner from the base end side to the distal end side of the pressure adjusting screw. Even when the pressure adjusting screw is further rotated after the spring receiver is detached from the screw part of the screw, the screw part can be prevented from being damaged by the screw receiver. Further, in order to prevent damage to the screw portion, the number of steps and the number of parts are not increased.

According to the third aspect of the present invention, in addition to the common effects obtained in the first to fourth aspects of the present invention, the taper angle of the spring receiving sliding contact portion is set to 20 °. For rotation in the pressure increase direction, sliding contact rotation without screwing with the spring receiver is allowed, and for rotation in the pressure reduction direction, smooth re-engagement of the screw portion and screw hole is guided. The two functions of performing the operations can be effectively performed.

According to the fourth aspect of the present invention, the threaded end side of the screw hole of the spring receiver is formed at the same taper angle as the sliding contact portion of the spring receiver. The contact area between the spring receiver disengaged from the spring receiving portion and the spring receiving sliding contact portion can be increased. Therefore, even when the urging force of the pressure adjusting coil spring is strong, damage to the screw portion of the pressure adjusting screw can be more effectively performed. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view of an air pressure regulator of the present invention;
The state in which the spring receiver is fitted to the thread portion of the pressure adjusting screw is shown.

FIG. 2 is a partially enlarged view showing a cross section of a tip end of a pressure adjusting screw and a spring receiver.

FIG. 3 is a cross-sectional view of the pneumatic regulator, showing a state in which a spring receiver is detached from a thread portion of a pressure adjusting screw.

FIG. 4 is a partially enlarged view of a state where a spring receiver is in sliding contact with a spring receiving sliding contact portion of the pressure adjusting screw.

FIG. 5 is a cross-sectional view showing an example of a conventional air pressure regulator, and shows a state in which a spring receiver is fitted to a thread portion of a pressure adjusting screw.

FIG. 6 is a cross-sectional view of the air pressure regulator, and is a partially enlarged view of a state where a spring receiver is separated from a pressure adjusting screw.

FIG. 7 is a sectional view of another example of the conventional air pressure regulator.

FIG. 8 is a cross-sectional view of still another example of the conventional air pressure regulator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Handle 14 Pressure adjusting screw 15 Spring receiver 16 Diaphragm 18 Pressure adjusting coil spring 21a Screw part 21b Spring receiving sliding contact part 22 Screw hole 23a Screw screw end α Taper angle

Claims (4)

[Claims] 1. A pressure adjusting spring for urging the diaphragm is interposed between a spring receiver for screwing a screw hole into a screw portion of the pressure adjusting screw and a diaphragm disposed opposite to the spring receiver. In the fluid pressure regulator mounted, a spring receiving slide that comes into sliding contact with a screw hole of a spring receiver that has been detached from the threaded portion on the tip end side of the screw portion of the pressure adjusting screw without being screwed. A fluid pressure regulator, wherein a contact portion is formed, and the spring receiving sliding contact portion has a tapered shape that becomes thinner from a base end side to a tip end side of the pressure adjusting screw. 2. The taper angle of the spring receiving sliding contact portion is approximately 1
The fluid pressure regulator according to claim 1, wherein the range is 5 to 30 degrees. 3. The taper angle of the spring receiving sliding contact portion is 20 °.
The fluid pressure regulator according to claim 1, wherein 4. The fluid pressure regulator according to claim 1, wherein the threaded end side of the screw hole of the spring receiver is formed to have the same taper angle as the spring receiving sliding contact portion.