JPS581212A - Reducing valve - Google Patents

Abstract

PURPOSE:To reduce wear in set pressure regulating part, and to simplify the regulating operation surely, by switching a pair of popet valves 30 and 31 through the use of a balancing beam rotated for a prescribed angle with the pressure of supplied fluid. CONSTITUTION:A balancing beam 37 inserted between popet valves 30 and 31 and provided lengthwise to them orthogonally is provided with a control rod 38. A turning point 37a of the beam 37 is provided to a tip of an adjusting screw 39 screwed from the outside of a body 32 and its rotating part 37b is linked with a rod 41 to a moving part of a diaphragm 40 as a pressure sensing element displaced in response to the supplied fluid pressure. The set pressure is determined with a supoprting position of the point 37a, the balancing beam 37 is turned with the diaphragm 40 when the fluid pressure is greater than the set pressure, the valve 30 is closed and the valve 31 is opened for pressure reduction. When the fluid pressure in a pressure chamber 33 is lowered, the beam 37 is turned inversely to keep the fluid pressure constant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel pressure reducing valve that employs a displacement balance type.

Generally, pressure reducing valves are used at sites equipped with various pneumatic devices to reduce the high pressure of air supplied from an air compressor, etc.
After reducing the pressure according to the purpose of use, it is used for fc to maintain the pressure after the reduction at a constant level. As such a pressure reducing valve, a force balance type as shown in FIG. 4 has conventionally been adopted.

To explain this simply, the reference numeral 1 in the figure is the main body, and a cup-shaped bonnet 2 is fixed to the upper end of the main body with bolts, etc., and the internal space formed by this is the body 1 and the bonnet 2. The upper and lower two chambers, 3mm, 3BK&, are formed by the diamond 7hum 3 interposed between them. At the center of this diaphragm 3, a support plate 5 having a pre-dna [, 4 is attached,
It is pressed downward by a coil spring 6 housed in an upper chamber 3 mm inside the bonnet 2.

The upper end of the coil spring 6 is supported by a spring receiver 1, and the lower end of a screw shaft 8 screwed onto the upper end of the bonnet 2 and having a knob 5at is in contact with the spring receiver 7. The pressing force of the coil spring 6 against the plate 5 can be adjusted by rotating the screw shaft 8 and moving it forward and backward. A 2Ka air hole 2a is bored, thereby communicating the upper chamber of the diaphragm 3 with the outside air.

On the other hand, in the center of the main body 1 is the diamond 72 mm 3.
A central passage 9 is bored into the lower chamber KH2, and a small diameter passage 1o is formed in the middle of the central passage 9.

A plug 11 is disposed below the small diameter passage 10 so as to close the small diameter passage 10, and a small spring 12 constantly applies an upward force to the small diameter passage 1o. The tip portion 11a extending through the bleed hole 4 of the plate 5 is supported by the diamond 7 rim 3.
The bleed hole 4 faces the lower opening side and is configured to be able to open and close.

Further, a cup-shaped filter cover 13 is fixed to the lower end of the main body 1 like the bonnet 2, and a cylindrical air filter 14 is arranged inside the filter cover 13 so as to surround the opening of the central passage 9. There is. An inlet portion 15 bored at the side of the main body 1 communicates with the external space of the air filter 14 through a mineral passage 16, and an outlet portion 1T is connected through a passage 18 above the small diameter passage 10 of the central passage 9. It is connected to &1Iyru+ of the air filter 14.

Furthermore, reference numeral 19 indicates a buoy, which is attached to the filter 14 side of the central passage 9 and has a plurality of passage holes 20a. 20KI! It is fixed to the body 1 side with a rod 21 provided. Further, 22 is a drain cock screwed into a drain hole 13a formed in the lower end of the filter cover 13.

In such a configuration, the plug 11 is compressed and supported by the coil spring 6 and the small spring 12, and the air pressure supplied from the inlet portion 15 is supplied to the lower chamber 3B.
Since the force is determined by the balance with the force applied against the coil spring 6 through the diamond 7 ham 3, a so-called force balance type structure is adopted.

Therefore, in such a state, the air supplied from the inlet 15 is sent into the central passage 9 via the stone air lamp and air filter 14, and is further passed through the busy small diameter passage 1° so that a part of it is below the diaphragm 3*. While being led to 3B, passage 18
is sent to the exit section IT. At this time, if the air pressure exceeds the set pressure of the coil spring 6, the diamond 7
The plate 5 moves upward with the knob 3, and the tip 111 of the plug 11! L is opened to the bleed hole 4, air enters the upper chamber 3m through the bleed hole 4-IP, and is discharged outward from the air hole 2a, thereby reducing the pressure.

That is, in the above-described force-balanced structure, the spring 6.1
2, the plug 11, the small diameter passage 1o, and the plug tip 11
a and the opening device of the bleed hole 4 are adjusted, the air pressure is reduced to the desired pressure, and with that pressure maintained, the outlet section 1T is opened.
It is taken from.

However, according to such a conventional force-balance type 0 pressure reducing valve, a strong force is applied to the tip of the threaded portion of the screw shaft 8 for adjusting the set pressure, which supports the spring receiver T.
When the screw shaft 8 is adjusted, it tends to wear out easily, causing problems such as rudders, and there are other problems such as poor operability.

In addition, for the reasons mentioned above, the can part requires a strong 111@, which not only makes the whole thing a failure, but also has the disadvantage of being heavy and bulky.

The present invention addresses these circumstances KII! It is a good thing to see,
The so-called displacement balance type uses a pair of poppet valves that serve as supply and exhaust valves facing each other, and a balance beam that opens and closes these poppet valves by turning and displacing them at a predetermined angle depending on the supply fluid pressure. Due to its simple configuration, the strong force of the supply air pressure is not applied to the set pressure adjustment section compared to the conventional force balance type, which results in less wear and improved operability. To provide a pressure reducing valve that can be expected to be smaller in size as a whole and to reduce costs by using lightweight parts for each component.
It is.

Hereinafter, the wA of the present invention will be explained in detail using drawings and examples.

Fig. 2 is for explaining the operating principle of the displacement balanced pressure reducing valve according to the present invention. A pair of poppet valves constitute a supply and exhaust valve, which are arranged facing each other facing the pressure chamber 33 inside the media 32. The supply fluid from the inlet 34 provided at the back of the air supply side poppet valve 30 is guided into the pressure chamber 33 via this poppet valve 30, and the magnitude of the fluid pressure is K.
Excess supply fluid is exhausted from the bleed hole 35 via the exhaust side poppet valve 31 which is opened and closed, and the supply fluid reduced to an appropriate pressure is taken out from the outlet 36.

Now, the feature of the present invention is that a displacement balance type is adopted instead of the conventional force balance type as a means for relatively opening/closing a pair of poppet valves according to the magnitude of supply fluid pressure. That's true.

To explain this in detail, 37 in the figure is the poppet valve 30.3.
A control rod 38 is provided on this balance beam 3T, which faces each of the poppets 30 and 31 and controls the relative opening and closing of the poppets 30 and 31. It is being Nine, this balanced beam 3
Pivotal point of T37. L is provided at the tip of an adjustment screw 39 screwed in from the outside of the body 32 so that the balance beam 3T can be moved from the outside in a direction perpendicular to the longitudinal direction, while the rotating portion 3Tb is 42 in the figure is connected by a rod 41 to a movable part of a diaphragm 40 as a pressure-sensitive element that engages in position depending on the magnitude of the supplied fluid pressure.
is a spring as a biasing means for maintaining the relative position of the balance beam 37, and atmospheric pressure is introduced to the opposite side of the diaphragm 40 from the pressure 1133.

According to such a displacement balanced type pressure reducing valve, the set pressure is fixed depending on the support position of the pivot point 37a by the adjusting screw 38, and when the supplied fluid pressure becomes larger than this set pressure, The balance beam 3T is rotated by the diaphragm 40,
When the air supply side poppet valve 30 closes, the exhaust side poppet valve 31 opens to reduce the pressure.Also, when the fluid pressure in the pressure chamber 33 decreases, it is also balanced at the diamond 7 hum 40. The beam 37 is rotated in the opposite direction, the exhaust pipe is closed,
Plow so that the air supply side opens and maintains the fluid pressure at a constant value.

When such a displacement balance type is adopted, compared to the conventional force balance type, strong force due to the supply fluid pressure is not applied to the adjustment section, which eliminates problems such as wear and steering, and improves operability. Since it is a tortoise, it has the advantage that each component can be lightweight and simple.

Figures 3 and 4 show an embodiment of a pressure reducing valve embodying the present invention, and the same or corresponding parts as in Figure 2 are given the same numbers, and detailed explanations W14 are omitted.

In these figures, to briefly describe the general structure of the pressure reducing valve, this pressure reducing valve consists of a main body So and an upper cover 51 and a lower cover 52 connected above and below the main body So, and is provided on the lower cover 52. The supply fluid from the ninth port 34 is interposed between the body 501 and the lower lid 52, passes through the nine filter 53t and the passage 54, and is led to the pressure chamber 33' formed in the upper M51, and further into the pressure chamber 33. From above 1i51 side exit 3
Sent from 6. An air supply side poppet valve 30 is provided in the passage s4 so as to face the pressure chamber 33, and an exhaust side poppet valve 31 is provided on the upper 11 side so as to face the air supply side poppet valve 30.
51 side.

The balance beam 37, which is disposed in a direction perpendicular to the poppet valves 30 and 31 with one end facing between the poppet valves 30 and 31, has an L-shaped plate spring 55 at its longitudinal center, and an upper cover via a ;-shaped bracket 56. 51 is fixed to an adjustment screw 311 screwed in from the upper end, and this portion is used as a pivot point 37a. Furthermore, the other end of this balance beam 370 is connected to a leaf spring ST.
, is connected to a support plate 59 fixed to the movable portion of the diaphragm 40 via a bracket s8, and this portion serves as a rotating portion 3Tb.

According to this embodiment, the rod portions 80 protrude from the valve bodies 3Qa, 31a constituting each poppet valve 30, 31.
b, 311> contacts the balance beam 37 and is controlled.

Furthermore, atmospheric pressure is introduced into the space defined by the pressure chamber 33 by the diaphragm 40 inside the body 1 through the through hole 60a, thereby forming an atmospheric chamber 60.

According to the above-mentioned configuration, depending on the magnitude of the supply fluid pressure, the pressure of the diaphragm 400 is transmitted to each poppet valve 30, 31 by the balance beam 37, and these are relatively opened and closed to perform pressure reduction. Therefore, it is easy to understand that the above-mentioned nine action effects are used.

In addition, according to the above-mentioned displacement balanced type P pressure reducing valve, the pressure detection instruction, which required a pressure gauge or other instrument in the force balanced type, can be replaced with a simple pressure detection instruction as shown in FIGS. 4 and 5, for example. The instruction mechanism has the advantage of being easy and reliable.

To explain this simply, reference numeral 61 in the figure is a bracket formed by bending into a box shape, 62 is a scale display plate fixed to a part of the bracket, a pointer 63 is pivoted on the bracket 81tC, and the dial is The 7-tum 400 is fixed on a rotation shaft 64 which is rotated by an extension rod s9 from the support plate 5s. The displacement of the diaphragm 40 can be easily and reliably read as pressure from the outside by this pressure indicating mechanism attached to the side of the body 1.

In the above-mentioned embodiment, the diamond 7-trim 40 is used as the pressure-sensitive element, and the bias spring 42 is used to apply the biasing force. Of course, it is better to use 4.

As explained above, according to the pressure reducing valve according to the present invention, the displacement balance formula is used instead of the conventional force balance formula, so that the following advantages are achieved.

(1) Compared to conventional systems, strong force from the supply fluid pressure is not applied to the set pressure adjustment section, which reduces wear and tear on that part.
There are no problems with the steering, and the adjustment can be done easily and reliably.

(2) Light and simple components can be used, making it possible to reduce the overall size, weight, and cost of the entire device.

(3) By simply attaching a pressure indicating mechanism, pressure indication can be performed easily and reliably, which is advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of a conventional force-balanced pressure reducing valve.
Figure 2 is a principle diagram for explaining the operating principle of the displacement balanced pressure reducing valve according to the present invention, Figure 3, and tI/! Fig. i4 is a vertical sectional view and a partially omitted sectional view showing a different embodiment, and Fig. 5 is a perspective view showing an example of the pressure indicating mechanism section. 30.31...Pair of poppet valves, 33...Pressure chamber, 34...Inlet, 35...Bleed hole, 3
6...Exit, 37...Equilibrium beam, 37a...
...Pivotal point, ayb...Rotating part, 38...Adjustment screw, 40...Diaphragm (pressure sensitive element), 42
... Spring (biasing means), 60 ... Atmosphere iii. Patent Applicant Yamatake Hanequel Co., Ltd. Agent Masaki Yamakawa (Kumori 1 person) Figure 1 Figure 2 Figure 4 Figure 3 Figure 1 Figure 4 Figure 5 Continued from page 1 0 Author Yoshio Kayama Nishirokugo, Ota-ku, Tokyo 4-1 Toto Yamabu Honeywell Co., Ltd. Kamide Tamaba 0 Author: Yosuke Masano 4-To 1 Nishirokugo, Ota-ku, Tokyo Yamabu Honeywell Co., Ltd. Kamade Tamaba 0 Author: Hirano Special note Nishirokugo, Ota-ku, Tokyo Inside Yamatake Honeywell Co., Ltd.'s Kamata Factory, 4-chome To-1, Yamatake Honeywell Co., Ltd. Kamata factory, No. 1, 4-2 Nishirokugo, Ota-ku, Tokyo 0 Inventor: Takuji Hosoya

Claims (1)

[Claims] A pair of poppet valves are arranged facing each other and have the supply fluid pressure and atmospheric pressure guided to their backs, and nine equilibrium valves are arranged longitudinally and interposed between these poppet valves and perpendicular to them. a beam, a pivot point that allows the balancing beam to be adjusted and moved from the outside in a direction perpendicular to the longitudinal direction; Forms a well-defined pressure chamber,
9. A pressure reducing valve comprising: a pressure sensitive element constituting a partition wall through which atmospheric pressure is guided to the opposite side; and bias means for maintaining the relative position of the balanced beam.