JPH0359533B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a support means for an electronic component such as a reed switch of a control device having a controlled object.

Configuration of conventional example and its problems Reed switches are used as magnetic proximity switches, etc., and the conventional example of how to install them is described in Part 1.
As shown in the figure. 101 is a printed circuit board, 102 is a glass tube of a reed switch, and 103 is a lead, which is shown as examples A, B, and C of mounting to the printed circuit board 101. Means for holding and fixing the lead 103 on the printed circuit board 101, B is a means for placing the glass tube 102 on the printed circuit board, forming the lead 103 as appropriate, and fixing it. Furthermore, since the reed switch is a magnetic proximity switch, it is necessary to apply a magnetic field from the outside to activate it, and depending on the conditions for applying the magnetic field, it may be necessary to float the glass tube 102 above the printed circuit board and bring it closer to the magnetic field. As a fixing means, as shown in C, there is a means of forming the lead 103 and providing foot portions of the lead to float the glass tube and fixing the lead. In both cases, the glass tube 10 is
This is an example of installation with part 2 exposed, but there are problems such as the glass tube being easily damaged by even a slight external impact, or in the case of example C, the fixing of the reed switch is unstable. As a means to prevent this, there is a conventional method of embedding a glass tube and lead in a resin package 104 as shown in FIG. 2, but when mounting it as shown in FIG. There is a means for fixing by further providing a printed circuit board for mounting the reed switch on top, or a means for providing a separate part and fixing it by floating it above the printed circuit board 101. These conventional mounting and fixing means first make the reed switch package-type, which makes it 2 to 3 times more expensive than a single unit.Furthermore, if the mounting position is raised above the printed circuit board, separate parts are required, making the structure more complicated. It was getting expensive.

OBJECTS OF THE INVENTION The present invention is a control device that uses a reed switch, and provides a means for firmly fixing the reed switch at a position where it is easily activated by a magnetic field and for supporting it at low cost and reliably.

Structure of the Invention In order to achieve the above object, the present invention includes a control means for controlling a controlled object, a display means for displaying the operation of the control means, and an inspection means for checking the operation of the control means and the display means. The display means also serves as an operation display for the inspection means, and a magnetic sensing type switch means for operating the inspection means is located on the same side as and near the display means, and further comprises: This is a control device in which a magnetic sensing type switch means is embedded and fixed in the same support body, and only the switch means is hidden from the outside, and the switch means can be firmly supported and its position is clear, making it easy to operate from the outside. It becomes the composition.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, gas passes through a metal tank 2 of a gas supply line 1, passes through a shutoff device 3, and is supplied into the house after the flow rate is integrated by a gas meter 4. Since the gas meter 4 has a mechanical operating part that responds to the instantaneous flow rate, it is possible to obtain a flow rate signal by detecting this movement, and this is the flow rate measuring device 5. The flow rate measurement device 5 continues to send an instantaneous flow rate signal to the control device 6. This signal is sent in the form of pulses, so the control device 6
Then, the gas flow rate value at that time can be determined from the number of pulses per unit time. On the other hand, the control device 6 stores in advance limit values that are determined to be appropriate for the gas usage method. Criteria for this judgment include the instantaneous maximum flow rate when a consumer uses multiple gas appliances at the same time, and the maximum duration of continuous use without any temporal change in gas flow rate. In this way, the control device 6 determines the current flow rate value based on the flow rate signal sent from the flow rate measuring device 5, and compares it with its own stored proper usage conditions, and determines that there is an abnormality if the conditions deviate from these conditions. If it is determined that there is an abnormality, a cutoff signal is sent to the cutoff device 3 to cut off the gas supply, and a display signal is sent to the display 7 to display the reason for the judgment that the abnormality has occurred. Furthermore, it is possible to detect a small amount of gas leak inside a house by continuing to measure the flow rate for a certain period of time, and in this case as well, it is possible to only shut off or display. 8 is the power supply for these devices.

The interrupting device 3 is of a self-holding type so as not to consume power in the open state, and is effective when using a battery as the power source if it is of an instantaneous current operation type in which current is supplied only for the moment of closing. The flow measuring device 5 has a simple means for detecting the mechanical operation of the gas meter 4, such as a reed switch, a semiconductor sensor,
A power generation type element or the like is used. In this case as well, low power consumption is advantageous when configured as a device. Further, it is suitable to use a low power consumption type microcomputer as a part of the control device 6. Further, the display 7 can display the reason for the abnormality by using an LED, LCD, etc., and by the type of lighting, number, or number of lights.

In addition, the control device 6 is used to check whether the above-mentioned functions are working properly when the safety device is installed.
Alternatively, an intermediate check is required when an abnormality occurs, and an inspection device is provided for this purpose. By operating the inspection circuit, it is possible to perform functional inspections of control devices, shutoff valves, indicators, etc. can. An example of this is shown in FIG. 4. Reference numeral 9 is a circuit example of an inspection device for testing the shutoff valve 3 provided in a part of the control device 6;
11 is a resistor, 12 is a transistor, 13 is a reed switch, and 14 is a permanent magnet that operates the reed switch. When the contact of the reed switch 13 is driven by the permanent magnet, a one-shot current flows through the circuit of the cutoff valve 3, and the valve operates. become. At the same time, it is also possible to display the test interruption on the display 7 through another control circuit 6' including a main circuit or the like.

The system configuration has been described above, and next, an embodiment in which the gas meter 4 and each of these devices are provided in an integrated structure will be described.

In FIGS. 5 and 6, the gas meter 4 is mainly formed of a main case 15 and an upper case 16, and a counter mechanism is built in the center of the front of the upper case 16 to display the cumulative flow rate of gas by mechanical means. There is a counter case 17. Also, main case 1
5 has four measuring chambers divided by two diaphragms, and the measuring chambers on both sides are separated by two outer measuring chambers.
It is sealed by two belly plates 18. The upper case 16 has a mechanism section in the middle that converts the reciprocating motion of the diaphragm into rotational motion and transmits it to the aforementioned counter mechanism, as well as driving a timing valve that sequentially supplies gas to the aforementioned four metering chambers in order to continue the reciprocating motion of the diaphragm. is stored, and gas enters from the inlet 19 and exits from the outlet 20. Furthermore, 21 is a counter window for reading a counter.

The above gas meter configuration is well known and detailed explanation will be omitted.

The control device case 22 is provided in front of the belly plate 18 in front of the gas meter 4, and houses the control device 6, the display 7, and a power source 8 as a power source. Like the gas meter 4, the control device case 22 has a structure that protects these devices from wind and rain, and there is a display window 23 at the center of the upper front of the case 22 for viewing the internal display 7.

To explain in detail in FIGS. 7 and 8, the control device case 22 is made up of a bottom plate 24 and an upper case 25 having a display window 23 at the top, forming a box.The material may be resin or the like, but durability is taken into account. In this case, a metal plate is suitable. Inside the control device case 22, a printed circuit board 26 is fixed to the bottom plate 24, on which a control device 6 mainly consisting of a microcomputer is built in (not shown), an LED 27 as a display, and a control device A reed switch 13 as a contact for inspection is also connected to the board. Note that several LEDs 27 are provided at positions that can be seen through a transparent glass plate 28 used as a display window, and are used to display the reason for an abnormality. Furthermore, in order to be able to operate the reed switch 13 from the outside of the upper case 25 using the permanent magnet 14 or the like, if the upper case is made of a magnetic metal plate as described above, the reed switch 13 is placed at an opposite position near the inside of the transparent glass plate 28. It is provided. Therefore, LED2
7 and the reed switch 13 are located on the same side with respect to the transparent glass plate 28 and are close to each other, and it is necessary to support them at a certain distance from the printed circuit board 26. Only the necessary parts such as the reed switch 13 are embedded and fixed and inserted into the printed circuit board 26.
8 is a battery fixed on a printed circuit board.

In order to carry out an inspection operation in the above specific configuration, the reed switch 13 is buried in the support 29 and cannot be seen through the display window 23, but the positional relationship with respect to the display 27 is clearly defined in advance by the same support 29. In the above configuration, this is possible by bringing a permanent magnet close to the display window 23 below the LED 27.

As explained above, this device is an example in which a control device with a display and its inspection mechanism are applied to a gas meter with a shutoff device, and is a safety device that can check whether the function can operate normally. In order to provide a gas accident prevention device that will work reliably in an emergency, we will use the
A configuration in which the functions of the control device, shutoff valve, display, etc. can be easily inspected from outside the control device case without removing the control device case 22 or the upper case 25, and inspection work for safety devices that may occur in rare cases can be reliably carried out. This will further enhance safety.

Incidentally, the configuration in which the display device and the reed switch for inspection are formed and operated from the same support body, which is the main focus of the present invention, is not limited to the above-described embodiment of the gas meter.

Effects of the Invention As described above, according to the present invention, the following effects can be expected.

(1) The display means for displaying the operation of the control means can also serve as a confirmation display for inspection operations, and can be made compact with a simple structure that does not require a separate dedicated inspection display means.

(2) Since the magnetic sensing type switch means is located on the same side as the display means and is provided nearby, the inspection operation section is easy to understand and there is no need to provide a separate inspection operation section.

(3) Since the display means and the magnetic sensing type switch means are embedded and fixed on the same support, the structure is simple and can support both reliably, and the latter is also concealed, so it can withstand external forces. It has a protected structure and is effective in preventing tampering because it is operated from the outside using a magnet or the like.

(4) The position of the concealed switch means, which also prevents tampering, can be clarified in relation to the display means. In addition, only the person concerned can know the location.

(5) The normal and abnormal operating states of the switch means can be checked easily and easily from nearby display positions.

[Brief explanation of drawings]

1 and 2 are perspective views of a conventional reed switch support device, FIG. 3 is a block diagram showing a gas meter system with a shutoff device of a control device showing one embodiment of the present invention, and FIG. 4 is a diagram showing the same control device. FIG. 5 is a front view showing an embodiment in which a control device case including the control device of the present invention is integrated with a gas meter, FIG. 6 is a right side view of the same, and FIG. 7 is a circuit diagram showing the inspection mechanism of the device. 8 is a front view of the control device case, and FIG. 8 is a right side view of the control device case. 6...Control device, 27...Display device, 9
...Inspection device, 13...Reed switch, 29...
... Support body, 22 ... Control device case, 26 ... Printed circuit board, 28 ... Transparent glass plate.

Claims (1)

[Claims] 1. A control means for controlling a controlled object, a display means for displaying the operation of the control means, and an inspection means for checking the operation of the control means and the display means,
The display means also serves as an operation display for the inspection means, and a magnetic sensing type switch means for operating the inspection means is located on the same side as the display means and is provided in the vicinity thereof, A control device in which a type switch means is buried and fixed in the same support body, and only the switch means is hidden from the outside.