JPS5868576A - Selector switch for pneumatic controller - Google Patents

Abstract

PURPOSE:To facilitate manufacture and assembling operation of the titled apparatus, by holding a diaphragm between a pair of plate-like members, forming switches consisting of a plurality of chambers in the form of recesses formed in the surfaces of the plate-like members facing toward each other, and fastening the diaphragm, plate-like members and an outermost metal plate together in a unitary manner. CONSTITUTION:A cover 43 and a base 44, both shaped in the form of a plate, are disposed on the opposite sides of a plate-like diaphragm 42. Further, a capacity plate 46 of a metal plate is disposed on the outside of the cover 43 by the intermediary of a packing 45 while a bottom plate 48 is disposed on the outside of the base 44 by the intermediary of a packing 47. A selector switch used for a pneumatic controller, of this invention, is constituted by fastening these component parts together in a unitary manner. Here, four signalling chambers 54-57 and four control chambers 63-66 are formed in the surfaces of the cover 43 and the base 44 facing towrd each other, and switches 83-86 are constituted respectively by a pair of mating control chamber and signalling chamber. In the above arrangement, the switch 86 is constituted as an inverted switch by disposing a compressive coil spring 81 in the chamber 56 for urging the diaphragm 42 in a direction closing a connecting port 70.

Description

DETAILED DESCRIPTION OF THE INVENTION This control system is equipped with a balance unit and has a changeover switch for nine pneumatic controllers. A balance unit is often provided to eliminate the bang of the adjustment unit that occurs when switching from manual to automatic.

1111a This is a pneumatic circuit diagram showing an example of a large control system equipped with this type of balance unit. 1. To explain, in the control system, there are a friend adjustment unit 1, a hand*-knit 2, and a rose/soot unit 3, which are connected by piping.
bellows 4 where v is input and set value SP is input
A beam 6 is provided with a bellows 5 at one end. Further, the manual unit 2 is provided with a manual recess T, a nine switch 8, and a manual valve 9 into which the manual operating pressure FAS4 is input. A bellows 12 is connected to the nozzle 10 of the manual unit 3 by a pipe 11, and a bellows 14 is connected to the switch 8 of the manual unit 3 by a pipe 13. , also the adjustment unit lK
At the other end of the beam 6, there is a feedback bellows 17 connected to the back pressure side of the nozzle 10 through a pipe 11.
18 is installed in 9, and piping 1 is provided with differentiation unit 1.
9 and an integral unit 2a are provided. Furthermore, the back pressure side of the nozzle 21 installed on the beam 1s of the balance unit 2 and the feed batter bellows IT in the joint unit 1 are connected by a pipe 22, and a changeover switch 23, which will be described later, is connected in the pipe 22. It is provided. Note that there is a risk that the response to the operation of the manual valve (s) will be poor and a bump may occur due to a type of element consisting of an internal bellows and a variable throttle in this circuit, which may be switched before it stabilizes. , a changeover switch 2S is also provided in the bypass 24 provided in the I circuit. The aperture slows down the movement. 2T is the pressure supplied to maintain the automatic position of the changeover switch 23 when the manual unit 3 is removed for maintenance or other reasons. M8. When the supply pressure is not needed manually, it is throttled to reduce air consumption.

As described above, in the pneumatic circuit configured as above, the figure shows a manual state, and each switch 8,230 ports are opened and closed as shown. In this state, the measurement pressure P
When v and the set pressure BP are input to the bellows 4°5, the displacement of the beam 60 corresponding to the deviation is detected by the nozzle #1a. The characteristic is added to the feed pack to the bellows 16 and is also applied to one of the bellows 12 in the balance unit 2. On the other hand, since the other bellows 14 of the balance unit 2 is given the manual operating pressure FASa by the manual ff9, both bellows 12
．． 14 pressure difference at nozzle 21! 2 detected n% is applied to the feedback bellows 18 of the adjustment unit 1.

This pressure causes a displacement of the beam 6, which is also detected by the nozzle 10, so that a closed loop is formed in this circuit. This loop is a negative feedback loop that tries to lower the output of the balance unit 2 when the manual pressure is 1lli higher than the pressure detected at the nozzle. A relationship is formed such that the internal pressures of the bellows 12 and 14 are equal.

Therefore, when the manual control γ is pressed to switch the switch 8, the supply pressure FA84 is guided to the actuator 28 of the changeover switch 23 and remotely controlled.

The circuit is switched from manual to automatic and the adjusted air signal is output via amplifier 29. When switching to automatic mode in this way, since the internal pressures of the bellows 12 and 14 during manual operation differ by equal pressure as described above, a pressure equal to #i manual pressure and b pressure is applied to contacts 3G and 31 of changeover switch 23. Since they are applied at the same time, automatic switching does not involve sudden pressure fluctuations, making it possible to switch without bumps.

The changeover switch 23 used in such a location has conventionally been constructed as shown in FIG. That is, the changeover switch 23 is turned into a so-called spool valve, and the changeover switch 23 is inserted into the body 32.
At one end, a pressure chamber 33 is separated by an actuator 28 formed by a bellows 2 ram that is extendable and retractable. An integral piston 35 is fixed. Further, a plurality of metal rings 34 are fitted around the spool 34, and each metal ring 311
and the body 32 and the spool 34,
0-rings sr, ss for sealing gaps
is loaded. By doing this, the operating air pressure is guided to the pressure chamber 33 as described above, and the actuator 2
8 extends, the seal 34 slides and the path of the female air is switched to the automatic side.

However, such a conventional changeover switch 23,
In addition to the spool 34, many parts such as the metal ring 31 and the O-ring 37 are required, and the structure is complicated, which not only makes it impossible to construct a small and compact rotator, but also makes it impossible to maintain airtightness of many parts. However, they rarely have the drawbacks that they are difficult to process, and the assembly work is not easy and takes a long time. Furthermore, since the spool 34 must be moved forward and backward while maintaining airtightness, a large operating pressure is required, which is a problem.

Therefore, there is a demand for the development of a small and compact changeover switch to replace the spool valve type, but in developing such a switch, it is necessary to have a structure that is particularly robust, has high precision, and can be provided at a low cost. desired.

The present invention was developed in view of the above points, and a diaphragm is sandwiched between a pair of plate-like bodies, and the diaphragm is placed on the opposing surfaces of both plate-like bodies!
! A plurality of switches are formed, each consisting of an l-hole-shaped signal chamber and a control chamber, and by supplying pressure to the signal chamber, a diaphragm opens and closes the communication hole with the outside to operate nine air circuits. One of the switches is used as a reversing switch, and one of the other switches is configured to operate in the opposite direction, making bumpless switching possible with a small and compact structure with a small number of parts, and combining both plate-like bodies. By forming a resin molded product and superimposing a metal body on the outside and fastening it, it has a sturdy and highly accurate surface that does not bend, and the material cost is low. If we bulge out to make an air capacity chamber, then K
Make switching possible with less pressure fluctuations*? ! Ruru provides a pneumatic cylinder control meter exchange switch. Embodiments of the present invention will be described in detail below with reference to the drawings.

3 to 6 show actual examples of the changeover switch O according to the present invention, FIG. 3 is a cut-away diagram showing its basic configuration, FIG. 4 is an explanatory diagram of operation in manual mode, and FIG. 5 is an automatic FIG. 6 is an exploded II+ perspective view showing the embodiment. Since the configuration of the entire air conditioning circuit has been explained with reference to FIG. 1, a detailed explanation thereof will be omitted, and the explanation will be made with reference to the same figure when necessary. In the figure, the changeover switch 41 is a combination of the two changeover switches 23 and 25 shown in FIG. Toniso n
A cover 43 and a base 44 as plate-like bodies, respectively.
, a capacitor plate 46 as a metal body stacked on the outside 113 of the cover 430 via the packing 45, and the outside 113 of the base 44.
The main body is made up of a substrate 48 as a metal body which is stacked on top of the main body A7'h through a gasket 4T, and four bolts 49 that integrally fasten these entire members. Of these, the diaphragm 42 is formed into a rectangular flat plate shape from a thin plate material made of soft rubber, and has bolt holes 50 and 51 drilled at the four corners, the center, and the bottom. An air hole 52 is bored at a location that is offset toward the bottom. Next, the cover 43 is formed into a rectangular flat plate shape from a molded material made of hard synthetic resin, and has a bolt hole 53 bored in its center. Further, on the surface of the cover 43 facing the diaphragm 42, four signal chambers 5 are formed in the shape of circular concave holes.
4,55°ss and sr are arranged in a square shape at the center of each other, of which 311 signal rooms 54
55.56U, connected by a communication passage 58.59, and communicated with the outside by a pressure supply port 60.81 opened in the connection passage 58. Apertures 21i and 27 are provided as narrow portions with the same reference numerals as shown in FIG. In addition, the signal chambers 54, 55, and 57 are marked with n codes, B, and C, respectively, in accordance with FIG.
How many pieces?

Next, the base 44 is formed into a rectangular flat plate shape from a molded material made of hard synthetic resin, and a screw hole 62 is bored in the center thereof. In addition, a circular concave hole is formed on the surface of the base 44 facing the diaphragm 42.
control rooms 63, 64, 65, 66 are signal rooms 54, 55
, 56 and 57, and are arranged opposite to each other.
The symbols M, B, C, and R are also attached to correspond to the signal rooms. A circular boss 67 is protruded from the center of the bottom of each control chamber 63, 64, 85.6g, and a communication hole ss, ss communicating with the outside is provided at the center of the boss 67.

70.71 are opened each time. The communication hole 68 of the control chamber 63 (C) is connected to the back pressure side of the nozzle 21 of the balance unit p2 in FIG. , the adjustment unit 10 in FIG. 1 is connected to the back pressure side of the nozzle 10. In addition, the communication hole 70 of the control chamber 65@) is connected to the aperture 7
It is open to the atmosphere after 0 m. Furthermore, the control room 6
3Φ), 64(C) communication holes 88, 89 are provided with narrow portions 72.89 for obtaining a diaphragm effect. T3 is provided of
In addition, another communication hole 74.75.76.77 that communicates with the outside is opened in the eccentric part of each control chamber 83, 64, 85.66, and the communication hole T4 of the control chamber 83@ It is connected to the feedback base 18 of the harp clause unit 1, and a small pinching portion T8 is provided in the communication hole T4 to obtain a squeezing effect. In addition, the narrow part of the socket is also shown in Figure 1 with aperture T8.
It is shown as.

It is connected to the other feedback bellows 1γ of unit 1. Furthermore, the communication hole T6 of the control chamber 65 (6) is the first! ! 11K is connected to another air supply path (not shown), and the communication hole 77 of the control room 66 is connected to the bellows 14tC of the balance 22 P2. and,
As shown in Fig. 6 KIJ+ view, connect each communication hole to KII
The air circuit and the pinched portions 78, 711, which are connected to the base 44 and exposed to the atmosphere, are formed by molding at the same time as the base 44 is molded. Furthermore, from the middle of the communication hole To of the control room @5, the air hole 5 of the diaphragm 42
A connection hole 80 passing through 2 is branched, and the other end of this connection hole 1O receives a signal IE5? (4) is opened. In front of you, the signal room! ! A compression coil spring 81 that biases the diaphragm 42 in the closing direction of the communication hole TO (D) is loaded in the metal 82 and - in the switch (T) @3 with the above configuration. , switch (B) 84, switch (
C) IIs, and a reversing switch (b) 86 are formed. Then, the diaphragm 42, cover 43, and base 44 are inserted into the hole 53 with the compression coil spring 81 and washer 82 loaded inside the reversing switch.
! A countersunk screw $T is passed through 51 and screwed into the threaded hole 62, thereby integrating the parts.

Next, the packing 45 is formed into a rectangular frame shape from soft rubber or plastic, and has a shape on both sides.
Fine mesh-like protrusions are integrally formed during molding.

In addition, the capacity plate 46 is made of metal and formed into a rectangular shape.
By bulging outward, a capacity chamber 461 is formed which communicates with the throttle 26 between the control chamber 55 of the switching switch) and the control chamber 56 of the reversing switch. In addition, in the basic configuration diagram in Figure 3, the connection j
i! The pressure supply ports 60 and 81 are shown as being provided on the cover 43 and the capacity plate 4B, but in reality, as shown in FIG. A vertical hole 88 provided in the base 44,
It communicates with an air circuit 91 provided on the back side of the base 44 through 819.90, and is connected to the manual unit 3 and the pressure supply path. On the other hand, the gasket 47a is made of soft rubber or plastic and is formed into a rectangular plate shape, and both sides thereof are provided with large protrusions f'L formed in a fine mesh shape, and a communicating hole in the base 44. 68-71
．． 14 to γT are provided with air holes 92 corresponding to the terminals of the air circuit 81, etc. In addition, the board 48 on the controller main body side
Also, an air hole 93 corresponding to this air hole 82 is provided.

The capacitor plate 46 configured in this way, the packing 45,
The assembly of the cover 43, the diaphragm 42, the base 44, the cover 47, and the substrate 48 are stacked on top of this and are tightly fastened while maintaining airtightness.

The production of the n-death changeover switch 41 configured as described above will be explained. First, in Figure 4, which shows the manual mode, the switch 俤)
14 and switch (C) SS, air pressure FAlilfi is introduced from the pressure feed port @O, and this air is discharged to the atmosphere from the pressure boost port 81 via the throttle 61 and the switch 8 shown in FIG. It's being carried away. Therefore, the diaphragm 42
Since no pressure is applied to the switch (B) 84 and the boss @T of the switch (B) 85 are open, each circuit facing the control room 63, 6411 is open. On the other hand, another supply pressure FA8° is supplied from the communication path 76 to the reversing switch (8) 86, and the compression spring 81
Since the diaphragm 42 is pressed against the elastic force of
The signal is sent to the signal chamber 5γ of T, and the diaphragm 42 is pressed to close the opening of the boss 61. Therefore, switch prisoner 81
The circuit facing the control room 66 is closed.

Next, as described above, when the manual knob T of the manual unit 3 is pushed in to switch to automatic mode as shown in FIG.゜ is given n
As a result, the diaphragm 42 is pressed to close the opening of the boss 67 and close the circuit facing the control chambers 63 and 64. on the other hand,
Equal pressure is introduced into the receiving chamber 56 and the control chamber 65 that sandwich the diaphragm 42 at the reversing switch (6) 86, but the signal chamber! In SF, the elastic force of the compression coil spring 8-10 is added to this, so the opening of the boss 6T is closed and the opening of the boss 6T is opened. There is. Invert switch like this @)8
9 switches through 6 ■ 8T and switches without through @ 84
, (It is understood that Q85 and Hiro always operate in reverse, and the purpose is achieved when you want to obtain mutually reverse operation like the changeover switch 23 in Fig. 4. I have already explained it before, so I will omit that explanation.

As is clear from the above description, according to the present invention, in a changeover switch for a pneumatic controller, a diaphragm is sandwiched between a pair of plate-like bodies, and a concave-shaped signal chamber is formed on the opposing surfaces of both plate-like bodies. A control room forms a multi-region switch, and by supplying pressure to the signal room, a diaphragm opens and closes the communication hole with the outside to operate the air circuit, and one of the switches is used as a reversal switch to operate the other. By configuring one of the switches to operate in reverse, the number of parts is reduced compared to conventional changeover switches, the structure is significantly simplified, assembly is easier, and the overall size is extremely small. It can be configured compactly.

In addition, both plate-like bodies are made of synthetic resin molded products, and the
By stacking the metal bodies and fastening them together, a sturdy structure can be obtained without bending, and an extremely high-precision facing surface can be obtained without the need for machining, improving performance. can be provided at low cost. Furthermore, by bulging one metal body to form an air capacity chamber, pressure fluctuations can be alleviated, thereby improving the switching function.

[Brief explanation of drawings]

Fig. 1 is a pneumatic circuit diagram showing an example of a control system equipped with a balance unit, the wcz diagram is a sectional view of a conventional changeover switch, and Figs. Fig. 3 shows an example of a real plane, Fig. 4 is a sectional view showing its basic configuration, Fig. 4 is an explanatory diagram of operation in manual mode, Fig. 5 is an explanatory diagram of operation in automatic mode, and Fig. 6 is an exploded perspective view showing an embodiment. Illustrated. 41...Selector switch, 42...Diaphragm, 43...Cover, 44...Base, 46...
... Capacity plate, 41ia... Capacity chamber, 48...
Board, 54.55, 56.57...Signal room, @3,
64. f15,6B...Control room, 68,68. To
, 71... Communication hole, 83... Switch (2),
84...Switch (B), 85...Switch (
C), 118... Reversing switch (8). Patent Applicant Yamatake Hanewael Co., Ltd. Agent Kazuyoshi Yamakawa (and 1 other person) Figure 2 Figure 3/, 1 Figure 4

Claims (2)

[Claims] (1) A planar diaphragm is sandwiched between a pair of plate-shaped bodies, and a number of switches each consisting of a concave signal chamber and a control chamber are formed on the opposing surfaces of both plate-shaped bodies, and the switches are connected to the signal chamber. A communication hole with the outside that opens into the control chamber is opened and closed by supplying pressure to operate a circuit facing this communication hole, and one of the switches is used as a reversal switch to reversely operate one of the other switches. A changeover switch for a pneumatic adjusting needle, characterized in that both plate-like bodies are made of synthetic resin molded products, and a metal body is superimposed and fastened on the outside of these plate-like bodies. (2) A flat diaphragm is sandwiched between a pair of plate-like bodies, and a plurality of switches consisting of a recessed O signal chamber and a control chamber are formed on the opposing surfaces of both plate-like bodies, and a plurality of switches consisting of a concave O signal chamber and a control chamber are formed, and the switch is connected to the signal chamber. A communication hole with the outside that opens into the control chamber is opened and closed by pressure feeding, and one path through the communication hole 1cII is operated, and one of the switches is operated in the reverse direction by using the switch as a reversal switch. In addition, both plate-like bodies are formed of synthetic resin molded products, a metal body is stacked and fastened on the outside of these plate-like bodies, and one of the metal bodies is expanded so as to serve as an air capacity chamber. A changeover switch for a pneumatic controller, characterized in that the switch extends out and communicates with an internal air passage.