JP2561699Y2 - Air regulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an air regulator for adjusting a discharge secondary pressure, and particularly to an air regulator of a type in which a flow rate is controlled by a vertical position of a floating piston. Regarding the coupling structure.

"Prior art and its problems" Air regulators with floating pistons are
Between the primary pressure inlet and the secondary pressure outlet, a valve body normally urged in the closing direction is provided, while the floating piston which moves by the pressure difference between the secondary pressure outlet and the pilot pressure chamber is connected to the main piston. The floating piston is urged in a direction opposite to the valve, and an exhaust hole provided in the floating piston is opened and closed by a relief valve integrally provided coaxially with the main valve.

When the floating piston moves due to the fluctuation of the secondary pressure,
When the relief valve and the exhaust hole of the floating piston are in contact with each other, the main valve opens and closes via the relief valve, and when the exhaust hole of the floating piston separates from the relief valve, air in the secondary pressure extraction chamber is released. Escape from exhaust vent. By this operation, the secondary pressure and the pressure at the outlet are kept substantially constant. The pressure in the pilot pressure chamber can be controlled by a pressure regulating mechanism that controls the introduction of the pressure of the secondary pressure outlet into the pilot pressure chamber, and the adjustment can adjust the extraction secondary pressure.

In this air regulator, the main valve and the relief valve located on the same axis must be connected via a connecting rod, and this connecting rod is used to prevent air from the primary pressure chamber from directly hitting the floating piston. Must pass through a small hole in the baffle. For this reason, conventionally, a small-diameter connecting rod is provided integrally with the main valve, and after inserting this connecting rod through a small hole of the baffle plate, a relief valve is caulked to the end of the connecting rod. However, since the connecting rod has a small diameter, the connecting rod may be deformed at the time of caulking, and when deformed, the closing operation of both valves becomes uncertain and leakage occurs. This leakage causes vibration of the floating piston or the main valve (relief valve), and the withdrawal secondary pressure does not reach the set value.

[Purpose of the Invention] Accordingly, an object of the present invention is to obtain a coupling structure in which the coupling rod is not likely to be deformed, based on the above awareness of the conventional coupling structure of the main valve and the relief valve.

"Outline of the invention" In the present invention, a connecting rod was provided integrally with one of the main valve and the relief valve, and when connecting the other valve to this connecting rod, the two were connected by melting and caulking. It is characterized by.

That is, the present invention provides a primary pressure inlet, a secondary pressure outlet, a main valve that opens and closes between the primary pressure inlet and the secondary pressure outlet, and a pressure difference between the secondary pressure outlet and the pilot pressure chamber. A floating piston having an exhaust hole moving therewith; when the floating piston is moving to the secondary pressure extraction chamber side, the floating piston contacts and closes the exhaust hole, and when the floating piston moves to the pilot pressure chamber side, the floating piston is closed. One of a main valve and a relief valve in an air regulator having an opening, a relief valve coaxially and integrally provided with a main valve; and a pressure regulating mechanism for controlling introduction of pressure of a secondary pressure outlet to a pilot pressure chamber. A connecting rod is integrally provided on one of the valve bodies, a step portion and a small-diameter end portion following the step portion are provided on the connecting rod, and the other valve body has a center through which the small-diameter portion of the connecting rod is inserted. The hole and the end face where the step When the step of the connecting rod is in contact with the end face of the other valve body, an electric spark is generated between the tip of the small diameter portion and the discharge electrode between the tip of the small diameter portion and the discharge electrode. A welding voltage is applied under arc welding conditions such that the tip of the small diameter portion is melted and electric spark does not fly between the other valve body and the discharge electrode, and the connecting rod and the other valve body are integrated. It is characterized by having.

According to this structure, when connecting the valve bodies, there is no possibility that the connecting rod is deformed, and the other valve body is not deformed by the electric spark. Therefore, the closing operation of the main valve and the relief valve is uncertainly performed. It is possible to prevent the floating piston from vibrating and to take out an accurate secondary pressure.

"Embodiments of the Invention" The present invention will be described below with reference to the illustrated embodiments. First 4
The overall structure of the air regulator according to the present invention will be described with reference to the drawings.

The housing 11 is denoted by reference numerals 11a, 11b,
It is composed of four members 11c and 11d. In the lowermost housing 11d, a primary pressure inlet 12 and a secondary pressure outlet 13 are opened, and a secondary pressure chamber communicating with the secondary pressure outlet 13 is provided.
14 are formed. A communication passage 16 between the primary pressure inlet 12 and the secondary pressure outlet 13 (secondary pressure chamber 14) is opened and closed by a main valve 17, and the main valve 17 is normally operated by the force of a compression spring 18. 17 closes the communication passage 16.

A control chamber 20 is formed between the uppermost housings 11a and 11b and communicates with the secondary pressure chamber 14 via a communication passage 19, and a measuring capsule 21 is located in the control chamber 20.
The measuring capsule 21 is a hollow container made of an elastic body, and its size is changed according to a pressure difference with the outside. The measuring capsule 21 is fixed to a lower end of a screw shaft 22 screwed to a shaft portion of the housing 11a, and by changing a screwing position of the screw shaft 22, the control chamber 20 is moved.
Change position within. 23 is an adjustment knob fixed to the upper end of the screw shaft 22, and 24 is a lock nut for fixing the screw shaft 22 to the adjusted position.

The measuring capsule 21 opens and closes the pilot valve 30 by moving its floating valve 31 up and down by adjusting its expansion / contraction or vertical position, and further moves the floating piston 31 up and down to further move the main valve 17 and the primary pressure inlet 12 and the secondary pressure inlet 12. It opens and closes the space between the next pressure outlets 13.

That is, the pilot diaphragm is provided between the housings 11b and 11c and between the housings 11c and 11d, respectively.
33 and the periphery of the control diaphragm 34 are sandwiched therebetween, and a pilot pressure chamber 35 is formed by the housing 11b and the pilot diaphragm 33. A floating piston 31 is supported at the center of the pilot diaphragm 33 and the control diaphragm.

The upper end of the pilot valve 30 is a measuring capsule.
The lower end of the valve unit 21 contacts the lower surface of the housing 21 and faces the pilot pressure chamber 35 through a communication passage 36 formed in the housing 11b. The pilot valve 30 has a ball body 37 at the upper end thereof.
7, i.e. the pilot valve 30 is always a measuring capsule 2
1 is pressed against the lower surface. The leaf spring 38 is fixed to the housing 11b by a fixing screw 39. The pilot valve 30 changes the flow passage area of the communication passage 36, that is, the flow passage area between the control chamber 20 and the pilot pressure chamber 35, according to its vertical position. The pilot pressure chamber 35 communicates with the outside air through a bleed hole 40.

The floating piston 31 has a retainer plate 41 along the pilot diaphragm 33, a retainer plate 42 along the control diaphragm 34, a center block 43 sandwiched between these plates, and a balance weight 44. Exhaust hole 45 opened to the pressure chamber 14 side
Is pierced. The exhaust hole 45 communicates with a relief chamber 47 formed by the pilot diaphragm 33 and the control diaphragm 34 via a radial passage 46, and the relief chamber 47 further communicates with outside air via a relief hole 48.

The opening end of the exhaust hole 45 to the secondary pressure chamber 14 is opened and closed by a relief valve 49, and the relief valve 49 is integrated with the main valve 17 by a connecting rod 17a. The gist of the present invention is the connection structure of the main valve 17 and the relief valve 49. 1 to 3 show the embodiment.

The main valve 17 has a small-diameter portion 17d formed at the tip of a connecting rod 17a via a step 17b. No screw is formed in the small diameter portion 17d. The tip of this small diameter portion 17d is
Various shapes as shown in FIGS. FIG. 2A shows a conical shape, FIG. 2B shows a hemispherical shape, and FIG. 2C shows a truncated conical shape.

On the other hand, a center hole 49c is formed at the center of the hemispherical relief valve 49 to fit precisely with the small diameter portion 17d.
The central hole 49c can be a straight hole as shown by a solid line in FIGS. 1 and 2, or a counterbore hole 49d as shown by a chain line in the same figure. Each small diameter part 17d has a center hole
If 49c is a straight hole, it protrudes from the relief valve 49, and if it has a counterbore 49d at the tip, it is determined to protrude from the bottom of the counterbore, and the length of the small diameter portion 17d, each shape of the tip, The arc welding voltage conditions, such as the combination of the hole shape with the center hole 49c and the magnitude of the welding voltage, are determined when an electric spark (arc) is generated between the discharge electrode E and the small diameter portion 17d (the coupling rod 17a). , So that the spark does not fly to the relief valve.

Therefore, in this embodiment, the center hole 49c of the relief valve 49 is fitted into the small diameter portion 17d of the main valve 17, and the end surface 49b is in contact with the step portion 17b, and the small diameter portion 17d (the coupling rod 17a) and the discharge electrode are connected. When an electric spark is generated between the two, the tip of the small diameter portion 17d melts and flows around the center hole 49c. Therefore, the connecting rod 17a and the relief valve 49 can be fixed by the fusion caulking. At this time, no force that deforms the connecting rod 17a is applied to the connecting rod 17a. Further, since the electric spark does not fly between the discharge electrode E and the relief valve 49, the relief valve 49 is not deformed, so that the operation of closing the exhaust hole 45 of the center block 43 does not become uncertain. .

3A to 3F show another example of the relief valves 49A to 49F, particularly another example of the shape of the end of the center hole 49a. When an electric spark is generated between the discharge electrode E and the small-diameter portion 17d in consideration of the length and the shape of the tip of the small-diameter portion 17d of the connecting rod 17a, the spark does not fly to the relief valve 49. The relief valve 49 is securely connected to the connecting rod 17a by the molten material of the small diameter portion 17d.

The pressure receiving area of the pilot diaphragm 33 and the control diaphragm 34 is
Is set larger. The floating piston 31
Compression spring 5 inserted between its upper surface and housing 11b
By 0, the main valve 17 is urged in a direction opposite to the urging direction. The force of the compression spring 50 is stronger than the force of the compression spring 18.

Positioned between the housings 11c and 11d on the lower surface of the control diaphragm 34, the peripheral flange of the buffer 51
51a is pinched and supported. The buffer 51 defines a diaphragm chamber 53 between itself and the control diaphragm 34. The diaphragm chamber 53 communicates with the secondary pressure chamber 14 through a communication hole 51b formed in the buffer 51. Further, the buffer 51 has a central hole 51c through which a relief valve 49 passes in a shaft portion thereof, and an annular bellows 55 is provided outside the central hole 51c. This annular bellows 55 is located outside the center hole 51c of the buffer 51 and inside the communication hole 51b, and its upper end is integrally connected to the center block 43 or the control diaphragm 34 of the floating piston 31, and Are integrally connected to the periphery of the center hole 51c of the buffer 51. The annular bellows 55 has the function of cutting off the communication between the diaphragm chamber 53 and the exhaust hole 45 (secondary pressure chamber 14) regardless of the vertical position of the floating piston 31.

A baffle plate 60 is fixed to the lower surface of the buffer 51. The baffle plate 60 prevents air flowing into the secondary pressure chamber 14 through the communication passage 16 when the main valve 17 is opened from directly hitting the floating piston 30.
17a passes through a small hole 60a formed in the center of the baffle plate 60. Therefore, the fixing of the relief valve 49 to the connecting rod 17a is performed after the connecting rod 17a is inserted into the small hole 60a.

The air regulator with the above configuration is connected to the primary pressure inlet 12
And in the state where no air pressure acts on the secondary pressure outlet 13,
The force of the compression spring 50 overcomes the force of the compression spring 18 and the floating piston
The main valve 17 opens the communication passage 16 through the relief valve 31 and the relief valve 49. From this state, when the primary pressure is supplied to the primary pressure inlet 12 and supplied to the secondary pressure chamber 14 through the communication passage 16, the pressure in the secondary pressure chamber 14 eventually increases. The pressure in the secondary pressure chamber 14 is applied to the diaphragm chamber 53 via the communication hole 51b of the buffer 51, and when the pressure exceeds a certain value, the floating piston 31 rises against the force of the compression spring 50. . Then, the main valve 17 rises by the force of the compression spring 18, and
The communication area with the communication passage 16 was reduced, and the main valve 17 eventually became
Close. When the floating piston 31 further rises, the relief valve 49 separates from the exhaust hole 45 of the floating piston 31, and the air in the secondary pressure chamber 14 is discharged from the bleed hole 48.

When the pressure in the secondary pressure chamber 14 increases, the pressure is applied to the control chamber 20 via the communication passage 19, and the measuring capsule 21 is contracted by the pressure. Then, the pilot valve 30 reduces or closes the communication area with the communication passage 36. Then, since the pilot pressure chamber 35 communicates with the atmosphere via the bleed hole 40, the pressure in the pilot pressure chamber 35 decreases, and the pressure difference between the pilot pressure chamber 35 and the diaphragm chamber 53 increases. Further increases the upward trend. Therefore, the main valve 17 closes the communication passage 16 and the secondary pressure chamber 14
Pressure drops.

When the pressure in the secondary pressure chamber 14 drops, the diaphragm chamber 53
The pressure of the piston also drops, and the force of the compression spring 50 causes the floating piston to move.
31 descends to the relief valve 49 side. Then, first, the exhaust hole 45 of the floating piston 31 is closed by the relief valve 49, and when the floating piston 31 is further lowered, the relief valve 49 and the main valve 17 are lowered to open the communication passage 16. Therefore, air flows again from the primary pressure inlet 12 to the secondary pressure chamber 14, and the pressure in the secondary pressure chamber 14 increases. Further, the decrease in the pressure in the secondary pressure chamber 14 is also applied to the control chamber 20, and as a result, the measuring capsule 21
Expands, the pilot valve 30 opens, and the pressure in the pilot pressure chamber 35 also decreases.
53, so that the floating piston 31 is
It operates sensitively to the pressure drop of, falls and opens the main valve 17. As a result of the above operations being performed continuously, the secondary pressure taken out from the secondary pressure outlet 13 becomes constant. The vertical position of the measuring capsule 21 in the control chamber 20 can be adjusted by changing the screwing position of the screw shaft 22 with the housing 11a. The vertical position of the measuring capsule 21 changes the opening of the pilot valve 30. Changes, the magnitude of the secondary pressure of the discharge can also be adjusted. Further, if the signal pressure is introduced into the measuring capsule 21, a secondary pressure having a magnitude corresponding to the signal pressure can be obtained.

In particular, in the present invention, since the connecting rod 17a of the main valve 17 and the relief valve 49 are connected by melting and caulking as described above, the opening and closing of the communication passage 16 by the main valve 17 and the exhaust hole 45 by the relief valve 49 are provided. Opening and closing, especially the closing operation thereof, can be reliably performed, and air leakage and vibration of the floating piston 30 resulting from the air leakage can be prevented beforehand. Therefore, an accurate secondary pressure can be obtained.

FIG. 5 shows a conventional connecting rod 17a and a relief valve 49.
FIG. Conventionally, connecting rod 17a
The protruding portion from the relief valve 49 at the front end of the rim was caulked by the caulking tool T. In this caulking structure, in particular, since the connecting rod 17a is thin and long,
7a may bend. On the other hand, it is clear that the connecting structure of the present invention has no possibility that the connecting rod 17a is bent.

"Effects of the Invention" As described above, the present invention places the main valve that opens and closes between the primary pressure inlet and the secondary pressure outlet and the relief valve that opens and closes the exhaust hole of the floating piston on the same axis. In a pneumatic regulator coupled through a coupling rod, a coupling rod is provided integrally with one of the valve body of the main valve and the relief valve. The other valve body is provided with a center hole through which the small-diameter portion of the connecting rod is inserted and an end face with which the step abuts, and the step portion of the connecting rod is abutted on the end face of the other valve body. In the state, between the tip of the small diameter portion and the discharge electrode, an electric spark is generated between the tip of the small diameter portion and the discharge electrode, and the tip of the small diameter portion is melted. Voltage under arc welding conditions that does not cause electric sparks Is applied to unify the connecting rod and the other valve body, so that air leakage occurs due to deformation of the connecting rod or deformation of the other valve body due to electric spark flying on the other valve body. There is no danger and therefore no vibration of the floating piston occurs, and no fluctuations in the withdrawal secondary pressure due to the vibration.

[Brief description of the drawings]

FIG. 1 is a front view in section of a main part showing an embodiment of a coupling structure of a main valve and a relief valve of the air regulator according to the present invention.
2A to 2C are front views showing examples of the shape of the tip of the connecting rod, and FIG.
3A to 3F are cross-sectional views showing other examples of the shape of the relief valve.
FIG. 5 is a longitudinal sectional view of the whole air regulator, and FIG. 5 is a front view in which a main part of a conventional coupling structure of a main valve and a relief valve is shown in section. 11 ... housing, 12 ... primary pressure inlet, 13 ... secondary pressure outlet, 14 ... secondary pressure chamber, 16 ... communicating passage, 17 ...
Main valve 17a Connection rod 17b Stepped portion 17d Small diameter portion 18 Compression spring 19 Communication passage 20 Control room 21
... measuring capsule, 22 ... screw shaft, 30 ... pilot valve, 31 ... floating piston, 33 ... pilot diaphragm, 34 ... control diaphragm, 35 ... pilot pressure chamber, 36 ... communication passage, 40 …… Bleed hole, 47…
… Relief chamber, 49, 49A to 49F …… Relief valve, 49b ……
End face, 49c: Center hole, 49d: Counterbore hole, 50: Compression spring, 51: Buffer, 51a: Peripheral flange, 51b: Communication hole, 51c: Center hole, 53: Diaphragm chamber, 55 ……
Annular bellows, 60 ... Baffle, 60a ... Small hole.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Juichi Aoki 1-840, Mitsuhashi, Omiya City, Saitama Prefecture Fujikura Rubber Industries Co., Ltd. Omiya Plant (72) Inventor: Mitsuru Hoshi (72) Inventor: Hisao Someya 1-840, Mihashi, Omiya City, Saitama Prefecture Fujikura Rubber Industries Co., Ltd. (72) Inventor: Takashi Ejiri 3-13-16, Nakano, Nakano-ku, Tokyo (56) References JP-A-62-157918 (JP, A) JP-A-62-159875 (JP, A) JP-A-60-87987 (JP, A) Fully open Showa 62-112714 (JP, U) Really open Showa 60 -10968 (JP, U) Jiko 62-39442 (JP, Y2)

Claims (2)

(57) [Scope of request for utility model registration] A primary pressure inlet; a secondary pressure outlet; a main valve for opening and closing the primary pressure inlet and the secondary pressure outlet; a pressure difference between the secondary pressure outlet and a pilot pressure chamber. A floating piston having an exhaust hole, which moves in accordance with the above condition; the floating piston comes into contact with and closes the exhaust hole when moving toward the secondary pressure extraction chamber, and the floating piston moves when moving toward the pilot pressure chamber. An air regulator, comprising: a relief valve that opens an exhaust hole and is provided coaxially and integrally with the main valve; and a pressure regulating mechanism that controls introduction of pressure of the secondary pressure outlet to the pilot pressure chamber. One of the valve body and the relief valve is provided with a connecting rod integrally with the valve body, and the connecting rod is provided with a step portion and a small-diameter end portion following the step portion. Center where the small diameter part is inserted When, the stepped portion is provided and an end face abuts the stepped portion of the coupling rod being in contact with the end face of the other valve body, between the discharge electrode tip of the small diameter portion,
An electric spark is generated between the tip of the small-diameter portion and the discharge electrode, and the tip of the small-diameter portion is melted, and a welding voltage is applied under an arc welding condition in which the electric spark does not fly between the other valve body and the discharge electrode. An air regulator wherein the connecting rod and the other valve element are integrated. 2. The air regulator as claimed in claim 1, wherein the connecting rod passes through a small hole in a baffle plate for preventing air from the primary pressure chamber from directly hitting the floating piston, and is connected to the other valve body. .