JPH0454492Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a pressure reducing valve that reduces the pressure of fluid supplied from a fluid pressure source to a device using fluid to a substantially constant value along the way, and in particular, the invention relates to a pressure reducing valve that reduces the pressure of fluid supplied from a fluid pressure source to a device using fluid to a substantially constant value. This invention relates to a pressure reducing valve with an improved structure of the part that adjusts the value.

Problems to be solved by conventional techniques and inventions This type of pressure reducing valve generally has a primary chamber on the inflow side of the fluid and a secondary chamber on the outflow side communicating with each other via a valve port on the outer surface of the body. By fixing the housing cylinder with the diaphragm in between, interposing an adjustment spring between the diaphragm and a spring retainer that is freely movable in the axial direction within the housing cylinder, and changing the amount by which the spring retainer is pressed. The secondary pressure is adjusted by adjusting the elasticity of the adjusting spring and moving the valve body connected to the diaphragm to change the opening degree of the valve port in balance between the elasticity of the adjusting spring and the pressure in the secondary chamber acting on the diaphragm. The elasticity of the adjustment spring is maintained at a set approximately constant value, and conventionally, the adjustment part of the elasticity of the adjustment spring is a screw hole with a T-shaped handle connected to a screw hole provided on the protruding end surface of the housing cylinder. It is known that the elasticity of the adjustment spring is adjusted by screwing together a rod and placing the tip of the rod against a spring holder, and then rotating the handle to advance the threaded rod and changing the amount by which the spring holder is pressed. Since the threaded rod with the handle is directly screwed forward, the height of the handle changes each time the spring elasticity, that is, the secondary pressure set value, is adjusted, and since adjustment cannot be performed at a fixed position, the height of the handle may vary depending on the conditions such as the installation location. However, it had the disadvantage that its use was limited. Also,
Separately, a screw hole is formed in the spring holder itself so that it can be freely slid into the housing cylinder, and a threaded rod that is screwed into the screw hole is inserted into an insertion hole formed on the protruding end surface of the housing cylinder. The threaded rod is inserted into the threaded rod, and the flange that protrudes on the outer periphery is placed against the edge of the insertion hole to support the screw rod so that it can rotate freely in a fixed position. They are fitted together so that they can rotate together using a hexagonal connection, etc., and are freely attached to the outer periphery of the protruding end of the housing cylinder, and the threaded rod is rotated integrally by rotating the adjustment knob to slide the spring holder inside the housing cylinder. It is also known that the elasticity of the adjustment spring is adjusted by moving the adjustment knob.However, although this structure has the advantage that the adjustment knob can always be rotated at a constant height during adjustment, Frictional resistance due to the restoring elasticity of the adjustment spring when rotating occurs not only at the threaded part of the threaded rod and the screw hole of the spring holder, but also at the part of the collar of the threaded rod that touches the rim of the insertion hole of the housing cylinder. In particular, when the setting value of the elasticity of the adjustment spring is in a high range, a large torque is required to rotate the threaded rod, making it difficult to rotate the adjustment knob.

Means for Solving the Problems The pressure reducing valve of the present invention was devised in view of the above points, and a threaded rod for pressing a spring retainer is inserted into a threaded hole provided on the protruding end surface of the housing cylinder. A cylindrical adjustment knob with a fitting part that is screwed together and can be rotated integrally with the threaded rod and slidably fitted is attached to the outer periphery of the protruding end of the housing cylinder so that it can only rotate freely. And so.

Functions and Effects of the Invention The present invention has the above-mentioned configuration, and when the adjustment knob is rotated, the threaded rod slides with respect to the adjustment knob and rotates integrally with the adjustment knob, thereby threading the spring presser. The elasticity of the adjustment spring is adjusted by changing the pushing amount of the adjustment knob, and by rotating the adjustment knob, the threaded rod screwed into the screw hole of the housing cylinder is advanced, and the tip of the rod is pushed into the spring holder. Because I'm getting older,
The frictional resistance due to the restoring elasticity of the adjustment spring when rotating the threaded rod is mainly limited to the threaded area between the threaded rod and the threaded hole in the housing cylinder, so the torque required to rotate the screw rod, that is, the adjustment knob, is reduced. It's small,
Even when setting a large elasticity for the adjustment spring, the adjustment knob can be easily rotated, and the threaded rod is fitted to the adjustment knob so that it can slide freely, allowing the adjustment knob to be rotated at a fixed position. Since it can be moved and screwed, the position of the adjustment knob can be kept unchanged throughout the adjustment range, eliminating the problem of limited use due to changing the operating position as with conventional handle type knobs. There is an effect that can be done.

Embodiment Hereinafter, an embodiment of the present invention will be described based on FIG.

The pressure reducing valve to which this embodiment is applied has a primary chamber 3 communicating with an air inlet 2 and a secondary chamber 5 communicating with an air outlet 4 inside a body 1, and a valve opening 7 in the vertical direction.
A housing cylinder 10 with a top plate 11 stretched over the edge of a recess 9 formed on the top surface of the body 1 is separated by a partition wall 6 with a diaphragm 12 formed therein.
A spring holder 14 is housed in the accommodating cylindrical body 10 so as to be freely movable up and down, and an adjustment spring 15 is installed between the spring holder 14 and the diaphragm 12. Spring presser 1
Adjustment spring 15 by changing the pushing amount of 4.
The elasticity of the valve rod is adjusted by balancing the elasticity of the adjustment spring 15 with the pressure of the pressure chamber 18 on the lower surface side of the diaphragm 12 that communicates with the secondary chamber 5 through the through hole 17. A valve body 20, which is movable integrally with the diaphragm 12 via a valve 19, moves up and down to change the opening degree of the valve port 7,
The flow rate of air flowing from the primary chamber 3 to the secondary chamber 5 is controlled to maintain the secondary pressure at a substantially constant value determined by the elasticity of the adjustment spring 15.

Next, the structure of the elastic adjustment portion of the adjustment spring 15 will be explained.
A screw hole 21 is formed in the center of the screw hole 21, and a screw rod 22 having a hexagonal head 23 and a spherical tip is screwed into the screw hole 21. An adjustment knob 25 made of synthetic resin that rotates the threaded rod 22 is placed on the upper surface of the spring presser 14 and at the upper end of the housing cylinder 10.
The adjustment knob 25 is formed into a substantially cylindrical shape with a closed top surface, and the head 23 of the threaded rod 22 is held substantially tightly in a hanging portion 26 formed at the center of the top surface. A hexagonal hole 27 is formed to fit freely in a slidable manner, and a fitting cylinder part 30 is provided around the hanging part 26 to fit into an annular protrusion 29 formed on the upper surface of the housing cylinder 10. Serrations 31 are formed on the outer periphery of the lower end of the fitting cylinder 30 over the entire circumference, and the housing cylinder 10
On the inner periphery of the upper end of the annular protrusion 29, locking teeth 32 that engage with the serrations 31 are formed at four locations at 90 degree intervals. A plurality of elastic locking pieces 34 having locking portions 35 at their tips are projected downward, and the locking portions 35 of the elastic locking pieces 34 are attached to the outer periphery of the annular protrusion 29 of the housing cylinder 10. , the adjustment knob 25 can be moved to a rotational operation position where the serrations 31 are disengaged from the locking teeth 32 as shown by the chain line, and a locking position where the serrations 31 are engaged with the locking teeth 32 as shown by the solid line. to be held respectively,
Two upper and lower fitting grooves 37 and 38 are provided around the circumference.

This embodiment has such a structure, and the adjustment spring 1
5, use the adjustment knob 25.
When it is pulled up from the lock position shown by the solid line, the elastic locking piece 34 elastically expands and its locking portion 35 is disengaged from the lower fitting groove 38, and then the restoring elasticity causes it to fit into the upper fitting groove 37. By being fitted, the adjustment knob 25 is held in a rotational operation position where its serrations 31 are disengaged from the locking teeth 32 of the housing cylinder 10 and can freely rotate, as shown by the chain line, and adjustment is performed in this state. When the knob 25 is rotated, the threaded rod 22 slides its head 23 inside the hexagonal hole 27 and rotates integrally, spiraling up and down inside the screw hole 21, and the pushing amount of the spring presser 14 changes. By doing this, the elasticity of the adjustment spring 15 is adjusted, and when the adjustment is completed,
When the adjustment knob 25 is pushed downward, the elastic locking piece 3
4 elastically expands and comes off from the upper fitting groove, and when the hanging part 26 hits the upper surface plate 11 of the housing cylinder 10, the elastic locking piece 34 is elastically restoring to the lower side, as shown by the solid line. At the same time, the serrations 31 are engaged with the locking teeth 32, so that the adjustment knob 25 is locked against the housing cylinder 10 so that it cannot easily be removed upwardly and cannot be rotated. be done.

That is, according to this embodiment, the threaded rod 22 screwed into the screw hole 21 of the top plate 11 of the housing cylinder 10 is rotated by the rotation of the adjustment knob 25, and the spring presser 14 is pushed in with its tip. Moreover, the tip of the threaded rod 22 is connected to the spring retainer 1.
Due to its spherical shape, which has a small contact area with the adjusting spring 15 when rotating the threaded rod 22,
Since the frictional resistance due to the expanding force of the restoring bullet is limited to only the threaded portion of the threaded rod 22 and the threaded hole 21 of the housing cylinder 10, the torque required to rotate the threaded rod 22, that is, the adjustment knob 25, is small, and the adjustment When setting the spring 15 to a large elasticity, it is easy to adjust the adjustment knob 2.
5 can be rotated, and the threaded rod 22
Since the adjustment knob 25 is designed to slide and screw forward with respect to the adjustment knob 25, the adjustment knob 25 can always be operated at a constant rotational operating position, and even after adjustment is completed, the adjustment knob 25 can be rotated at a slightly lower constant height. The height of the entire valve can be maintained constant over the entire range of the elasticity of the adjustment spring 15, that is, the set value of the secondary pressure.
This locking can be done extremely easily since it is sufficient to simply push the adjustment knob 25 from the rotation operating position against the elasticity of the elastic locking piece 34.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention. 1...Body, 2...Inlet, 3...Primary chamber,
4... Outlet, 5... Secondary chamber, 7... Valve port, 10
... Accommodation cylinder, 11 ... Top plate, 12 ... Diaphragm, 14 ... Spring holder, 15 ... Adjustment spring,
18... Pressure chamber, 20... Valve body, 21... Threaded hole, 22... Threaded rod, 23... Head, 25... Adjustment knob, 27... Hexagonal hole, 34... Elastic locking piece,
37... Fitting groove.

Claims (1)

[Scope of utility model registration request] A housing cylinder is fixed to the outer surface of a body with a diaphragm interposed between the body and the primary chamber on the inflow side of the fluid and the secondary chamber on the outflow side communicate with each other through a valve port. An adjustment spring is interposed between the diaphragm and a spring holder housed so as to be freely movable in the direction, and the elasticity of the adjustment spring is adjusted by changing the pushing amount of the spring holder, so that the elasticity of the adjustment spring and the diaphragm are The secondary pressure is maintained at a set substantially constant value by moving a valve body connected to the diaphragm and changing the opening degree of the valve port in balance with the pressure in the secondary chamber acting on the diaphragm. In the pressure reducing valve, a threaded rod for pressing the spring retainer is screwed into a threaded hole provided on a protruding end surface of the housing cylinder, and a fitting portion is provided so as to be rotatable and slidable integrally with the threaded rod. A pressure reducing valve characterized in that a cylindrical adjustment knob is freely rotatably attached to the outer periphery of the protruding end of the housing cylinder.