JPH0757804A - Isolation method for terminal base and one system in singnal loop using the same - Google Patents

Abstract

PURPOSE:To provide a terminal base capable of insertion connection of electronic elements between terminals without loosing the terminals. CONSTITUTION:This is a terminal base where first terminal 21 on the input side and a third terminal 23 on the output side are conductively connected to each other while a second terminal 22 on the input side and a fourth terminal 24 on the output side are conductively connected to each other. On a terminal base 20B insertion parts 27, 28 of electronic element accomodation parts 30 are arranged, which part 30 is constituted in an insertion style while provided with a first connector part 31 to which one end of the electronic element 33 is connected and a second connector part 32 to which the other end thereof is connected. When the parts 30 are inserted in the insertion parts 27, 28, the first connector part 31 is connected to a conductor part costituting part of conductive connection part between the first terminal 21 and the third terminal 23, while the second connector part 32 is connected to a conductor part constituting part of conductive connection part between the second terminal 22 and the fourth terminal 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal block structure and
The present invention relates to a method for realizing isolation between a processing system inserted in a signal loop and a signal loop system by using this terminal block.

[0002]

2. Description of the Related Art For example, in a power plant, various signal loop systems are provided for monitoring output power and control system. FIG. 4 shows a block diagram of an example of the signal loop system.

In the system of FIG. 4, reference numeral 1 is a sensor, and the output of this sensor 1 is supplied to a monitor circuit 2 so that the sensor 1
A direct current having a value (for example, 4 to 20 mA) corresponding to the detection output of 1 is obtained from the monitor circuit 2.

The direct current output from the monitor circuit 2 is supplied to the recorder 4 via the control circuit 3 to record the sensor output. The control circuit 3 forms a predetermined control signal from the DC current value from the monitor circuit 2 to perform feedback control or feedforward control. In this case, as shown in FIG. 4, the output current of the monitor circuit 2 constitutes a direct current loop LP.

When a processing system 5 for diagnosing the loop DC, for example, is connected to the output DC current loop LP of the monitor circuit 2 later, a terminal block 10 is generally used. That is, a part of the loop LP is cut, one end of the cut portion is connected to the input-side first terminal 11 of the terminal block 10, and the other end is connected to the input-side second terminal 12 of the terminal block 10. To be done.

The third terminal 13 on the output side of the terminal block 10 is
The first terminal 11 on the input side is conductively connected, and the fourth terminal 14 on the output side is conductively connected to the second terminal 12 on the input side. In the case of the example shown in the figure, the third terminal 13 on the output side is connected to the input terminal 5i of the processing system 5, and the fourth terminal 14 on the output side is connected to the output terminal 5o of the processing system 5. .

Each of the terminals 11 to 14 of the terminal base 10 is generally constructed by providing crimp terminals 11t to 14t on a terminal base 15 as shown in FIG.
1a to 14a lead wires to crimp terminals 11t to 14t
It is fixed to.

The processing system 5 is composed of, for example, a personal computer 5P, and displays the value of output power and other necessary information on the display 5D, and performs system abnormality diagnosis.

By the way, when it is necessary to perform maintenance and inspection of the processing system 5 while the loop LP is in operation (actually, bringing down the loop LP leads to down of the power plant. The system must always be in an operating state), so it is necessary to take so-called isolation so that the processing system 5 is separated and independent of the loop LP. This is because when the processing system 5 is not separated from the loop LP, the terminal 5 is
This is because the loop LP system goes down when i and 5o are opened. Also, terminals 5i and 5o
This is because, even when the space is not opened, the balance of the loop LP may be lost during the inspection work, which may cause an abnormal state.

In order to realize the above isolation, a diode D may be connected between the first and second terminals on the input side of the terminal block 10 when performing maintenance and inspection. Conventionally, this isolation diode D has the structure shown in FIG.
As shown in, two crimp terminals 1 on the input side of the terminal block 10
It was connected to 1t and 12t.

[0011]

By the way, as in the prior art, the isolation diode D is connected to the terminals 11, 1
In the case of attaching directly to 2, the crimp terminal 11
Loosen the screws 11a, 12 of
Must be connected. However, when the crimp terminals 11t and 12t are loosened in this way, there is a risk that the connection portion between these terminals and the loop LP becomes incomplete.
For this reason, it is very troublesome to perform work carefully so as not to affect the loop LP side.

A first object of the present invention is to provide a novel terminal block which is very suitable for use when realizing the above isolation. A second object of the present invention is to provide a method by which this novel terminal block can be used to easily realize the isolation of the processing system from the system of the loop LP while avoiding the above-mentioned conventional drawbacks. That is.

[0013]

In order to solve the above-mentioned problems, the terminal block according to the present invention has first and second input terminals for input to the base 20B when the reference numerals of the embodiments described later are made to correspond.
Terminals 21 and 22 and third and fourth terminals 2 for output
3 and 24 are provided, the first terminal 21 and the third terminal 23 are conductively connected to each other, and the second terminal 2
A terminal block in which the second and fourth terminals 24 are conductively connected to each other, and accommodates an electronic element 33.
Of the plug-in type electronic element housing section 30 including the first connector section 31 to which one end of the electronic element 33 is connected and the second connector section 32 to which the other end of the electronic element 33 is connected, 20B, the electronic element housing 3
When 0 is inserted into the insertion portion, the first connector portion 31, the conductor portion forming a part of the conductive connection portion of the first terminal 21 and the third terminal 23 are connected, and Two
The connector portion 32, the second terminal 22, and the conductor portion forming a part of the conductive connection portion of the fourth terminal 24 are connected to each other.

The isolation method according to the present invention uses the first and second terminals 21 and 22 of the terminal block 20.
Is connected in series in the signal loop LP, and the third and fourth terminals 23 and 24 are connected to the input end and the output end of a predetermined processing system so that the processing system 5 is inserted in the signal loop LP. In the system described above, the electronic element housing portion 30 housing the electronic element 33 for isolation is inserted into the insertion portion, and the third and fourth terminals 23 and 2 are inserted.
It is characterized in that the state of the system of the signal loop LP is maintained via the electronic element 33 regardless of the state of the processing system 5 connected to 4.

[0015]

In the terminal block according to the present invention having the above-mentioned structure, the electronic element housing section is inserted into the insertion section so that the electronic element is inserted between the first and second terminals or between the third and fourth terminals. Can be connected.

Therefore, by inserting the electronic element housing portion containing the isolation diode as the electronic element into the insertion portion, the signal loop for the signal loop connected to the input side can be operated without slackening the terminals of the terminal block.
Isolation of the processing system connected to the output side is realized.

[0017]

1 is a top view of an embodiment of a terminal block according to the present invention, and FIG. 2 is a sectional view taken along line XX of FIG.

In FIG. 1, 20 is a terminal block as a whole, and 20B is a terminal block base. On the base 20B, the first and second terminals 21 and 2 on the input side are provided.
2 and output side third and fourth terminals 23 and 24 are provided. In this example, the terminals 21 to 24 have the structure of crimp terminals as in the conventional example described above, and each of the screws 2
The lead wires are crimped and fixed to the terminals 21 to 24 by 1a, 22a, 23a and 24a.

In this example, the terminals 21 and 23 are conductively connected by the conductor plate 25, and the terminals 22 and 24 are conductively connected by the conductor plate 26. The conductor plates 25 and 26 have a T-shape in a top view in which the intermediate portions 25m and 26m on the side opposite to each other in the longitudinal direction thereof project toward the other conductor plate side. Then, as shown in FIG. 2, the projecting portion is bent into a U-shape so that the insertion concave portions 27, 28 can be formed.
Are formed.

The insertion recesses 27 and 28 have insertion pins 31 and 32 provided in the electronic element housing portion 30.
Is press-fitted. Then, if the electronic element housing portion 30 is grasped and pulled out, the housing portion 30 can be easily detached from the insertion recesses 27 and 28 and inserted.

The electronic element accommodating portion 30 is formed, for example, in a box shape. An electronic element 33 is accommodated in the accommodating portion 30, one end of the electronic element 33 is conductively connected to the insertion pin 31, and the electronic element 33. The other end of is electrically connected to the insertion pin 32. In the example of FIG. 2, a diode is housed as the electronic element 33.

Using this terminal block 20, the processing system 5 inserted in the signal loop LP as in the example of FIG.
An example in which isolation is taken for the signal loop LP is shown below.

That is, FIG. 3 is a block diagram showing a state in which the terminal block 20 is connected to the above-mentioned signal loop system. The first and second terminals 21 and 22 on the input side of the terminal block 20 are
It is connected in series to the loop LP. Further, the third and fourth terminals 23 and 24 on the output side of the terminal block 20 are connected to the input terminal 5i and the output terminal 5o of the processing system 5.

Then, when performing maintenance and inspection of the processing system 5, the insertion pins 31, 32 of the electronic element housing 30 to which the diode is connected as the transmission element 33 are inserted into the insertion recesses 27, 28. As a result, the processing system 5
The side is separated from the loop LP and isolation is achieved. Therefore, the maintenance and inspection of the processing system 5 can be performed without considering the influence on the loop LP.

In this case, unlike the conventional case, the isolation can be realized by simply inserting the storage section 30 without touching the connection terminals 21 and 22 on the loop LP side at all. .

The combination of the terminal block 20 and the electronic element housing portion 30 according to the present invention does not operate only for isolation as described above.

For example, when recording a signal on the recorder 4, a DC current of 4 to 20 mA is converted into a voltage, but before the recorder 4 in the loop LP, the first and second input sides of the terminal block are connected. This voltage conversion can be performed by connecting the terminals in series and inserting the pin of the electronic element housing portion 30 housing the resistor as the electronic element 33 into the insertion recess.

It is also possible to prepare an electronic element housing portion 30 in which a surge killer element is housed as an electronic element and insert it into the loop. In addition, the use as a terminal block is expanded.

The mode of conductive contact between the insertion portion of the terminal block 20 and the electronic element housing portion is not limited to the above-described coupling between the pin and the recess, and various configurations are possible. For example, a concave hole is formed between the conductor portions 25 and 26 of the terminal block 20 so that the electronic element housing portion can be pushed in, and the side surface of the concave hole is led out from the intermediate portion in the longitudinal direction of the conductor portions 25 and 26. The elastic contact piece is provided. On the other hand, elastic contact pieces connected to one end and the other end of the stored electronic element are provided on the side surface of the electronic element storage section 30. According to such a configuration, when the electronic element housing portion is pushed into the recessed hole of the terminal block 20, the elastic contact pieces of the electronic elements come into conductive contact with each other, and the same effect as described above can be obtained. Also in this case, the electronic element housing portion can be attached to and detached from the insertion portion.

In the above example, the first and second input side
The terminal and the third and fourth terminals on the output side are directly conductively connected by a conductive plate, but an electronic element is connected in advance between the terminal on the input side and the terminal on the output side. It is also applicable when it is.

[0031]

As described above, according to the present invention, the first terminal on the input side and the third terminal on the output are conductively connected to each other, and the second terminal on the input side and the output side are connected to each other. In the terminal block in which the fourth terminals are conductively connected to each other, the insertion portion of the electronic element storage portion is provided, and the electronic element storage portion is inserted into the insertion portion, so that between the first and second terminals, or Since the electronic element can be connected between the third and fourth terminals, it is not necessary to loosen the terminal portion in order to connect the electronic element between the terminals, and the electronic element is easily required. Electronic elements can be mounted.

Then, by using an electronic element housing portion which houses an element for isolation as an electronic element, and inserting this into the insertion portion, the processing inserted as a part of the signal loop through the terminal block. The system can be easily separated for the signal loop. At this time, there is no need to loosen the crimping terminal as in the conventional case, so the signal loop is not affected even when connecting the isolation element, ensuring safe and reliable isolation. can do.

[Brief description of drawings]

FIG. 1 is a top view of an embodiment of a terminal block according to the present invention.

FIG. 2 is a cross-sectional view taken along line XX of FIG. 1 and a diagram showing an electronic element housing portion.

FIG. 3 is a block diagram for explaining an embodiment of an isolation method according to the present invention.

FIG. 4 is a block diagram illustrating a conventional signal loop and isolation method.

FIG. 5 is a diagram for explaining a conventional isolation method using a terminal block.

[Explanation of symbols]

 20 Terminal Block 21 First Terminal on Input Side 22 Second Terminal on Input Side 23 Third Terminal on Output Side 24 Fourth Terminal on Output Side 25, 26 Conductive Plates 27, 28 Insertion Recess 30 Electronic Device Storage 31, 32 Insertion pin

Claims (2)

[Claims] 1. A base is provided with first and second terminals for input and third and fourth terminals for output, and the first terminal and the third terminal are conductively connected to each other. And a second connector block in which the second terminal and the fourth terminal are electrically conductively connected to each other, a first connector portion in which an electronic element is housed, and one end of the electronic element is connected; When the insertion part of the plug-in type electronic element storage portion having the second connector portion to which the other end of the element is connected is provided on the base, and the electronic element storage portion is inserted into the insertion portion. The first connector portion is connected to a conductor portion that constitutes a part of a conductive connection portion between the first terminal and the third terminal, and the second connector portion and the second terminal are connected. And a conductor part that constitutes a part of the conductive connection part of the fourth terminal A terminal block characterized by being continued. 2. The terminal block according to claim 1, wherein the first and second terminals are connected in series in a signal loop, and the third and fourth terminals are connected to an input end of a predetermined processing system and In a system in which the predetermined processing system is connected to the output end and the predetermined processing system is inserted into the signal loop, an electronic element storage section in which an electronic element for isolation is stored is inserted into the insertion section, and 3 and 4
An isolation method in which the state of the signal loop system is maintained via the electronic element regardless of the state of the processing system connected to the terminal.