JPH04136928U - temperature detection device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a small and low-cost temperature detection device that can issue an alarm when a set temperature is reached and display the temperature status up to that point. [Configuration] At least one temperature switch 3, and a receiving unit 8 that receives the open/close signal of this temperature switch 3 and issues an alarm.
In the temperature detection device, a temperature sensor 10 is provided in parallel to the temperature switch 3, and a display means 11 for displaying the temperature detected by the temperature sensor 10 is provided in the receiving section 8.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a temperature detection device using a temperature switch, and is particularly applicable to vehicle fire alarm systems. The present invention relates to a temperature detection device used in a device.

0002

[Conventional technology]

For example, a fire alarm system that detects the temperature around a car engine and issues an alarm, Conventionally, the configuration was as shown in FIGS. 3 and 4. In Figure 3, the engine of the vehicle body 1 is There are multiple, for example four, reed switch type temperature switches on the inner wall of engine room 2. 3 is installed. Then, the temperature in engine room 2 is lower than the predetermined set temperature. When the temperature reaches the top, the temperature switch 3 is turned on and an alarm is issued.

0003 FIG. 4 shows a conventional configuration of this type of temperature detection device. In Figure 4, four temperatures Both poles of switch 3 are connected to conductors 6 and 7 via connectors 4 and 5, respectively. Ru. One ends of the conductors 6 and 7 are connected to a receiving section 8 provided near the driver's seat. Inside the receiving unit 8, there is a power supply (not shown) that applies a voltage between both poles of the temperature switch 3, and a temperature switch. An alarm device (not shown) that is activated by the ON signal issued by the temperature switch 3 is provided. It is. Furthermore, a terminating resistor 9 having a constant resistance value R is connected between the conductors 6 and 7. ing.

0004 With the above configuration, if the temperature in engine room 2 is below the set value, each temperature step will be All switches 3 are OFF, and the current i flowing through the termination resistor 9 is detected. do. If this current i is detected, it is confirmed that the temperature detection device is operating normally. It has been recognized that failure diagnosis is possible. Also, at least a part of the engine room 2 When the temperature exceeds the set temperature, the temperature switch 3 near that part turns ON. , conductive wires 6 and 7 are connected. As a result, the current flowing through the conductors 6 and 7 changes and becomes I. The receiving section 8 issues an alarm due to this current change.

[0005]

[Problem that the idea aims to solve]

However, according to the conventional temperature detection device configured as described above, the engine Until the area around the temperature switch 3 in room 2 reaches the set temperature and an alarm is issued, the I don't know the temperature situation inside Gin Room 2. In other words, the set temperature is, for example, 130°C. In this case, as shown in FIG. 5(a), the temperature in the engine room 2 rises to 13 When the temperature reaches 0℃, the temperature switch 3 is turned on as shown in (b), and the temperature switch 3 is turned on as shown in (c). As shown, the alarm provided in the receiving section 8 is activated and issues an alarm.

[0006] This idea was made in consideration of the above points, and an alarm is generated when the set temperature is reached. A small, low-cost device that can send out warnings and display the current temperature status. The present invention aims to provide a temperature detection device.

[0007]

[Means to solve the problem]

In order to achieve the above object, this invention includes at least one temperature switch and Temperature detection device equipped with a receiver that receives the open/close signal of the temperature switch and issues an alarm. In the device, a temperature sensor is provided in parallel with the temperature switch, and the temperature sensor is provided in parallel with the temperature switch. The temperature sensor is characterized in that the sensor is provided with a display means for displaying the temperature detected by the temperature sensor. are doing.

[0008]

[Effect]

According to the above configuration, when the ambient temperature of the temperature switch exceeds the set temperature, the temperature When the switch is turned on, this signal is transmitted to the receiver and an alarm is issued. at the same time The temperature detected by the temperature sensor is displayed on the display means installed in the receiver, and temperature changes are You can know the situation.

[0009]

【Example】

Hereinafter, one embodiment of the temperature detection device of this invention will be described with reference to the drawings.

0010 FIG. 1 shows the configuration of an embodiment of this invention. In FIG. 1, the conventional example shown in FIG. The same reference numerals are given to the corresponding parts, and the explanation thereof will be omitted as appropriate.

[0011] The feature of this embodiment is that a thermistor is used as a temperature sensor instead of the resistor 9 shown in the conventional example. A table that detects the resistance change of the thermistor 10 and displays the temperature in the receiving section 8. The point is that an indicator 11 as an indicating means is provided. The resistance of the thermistor 10 is shown in the display section 8. A current detection circuit 12 detects a current change due to a resistance change and increases this detected current. An amplifier circuit 13 for outputting the signal to the indicator 11 is provided. Also, the current detection circuit In the path 12, the ambient temperature of at least one of the temperature sensors 3 exceeds the set temperature T, and the temperature A filter circuit that detects the current when the temperature sensor 3 is closed and activates the alarm 14. 15 is connected.

0012 Next, the operation of this embodiment will be explained with reference to FIG. Diagram of 4 temperature switches 3 As shown in Figure 3, install it on the inner wall of engine room 2, and install one of the temperature switches. Assume that one thermistor 10 is connected to the switch 3 in parallel. As shown in Figure 2(a) When the temperature in the engine room 2 gradually increases, the resistance of the thermistor 10 changes. However, a current change as shown in (b) occurs via the current detection circuit 12 and the amplifier circuit 13. can get. The pointer of indicator 11 swings as shown in (c) in proportion to this current value i. , the temperature inside the engine room 2 is displayed in analog form. Temperature inside engine room 2 When the temperature exceeds the set temperature T, at least one of the temperature switches 3 turns on and the power is turned on. The current detected by the current detection circuit is I. As a result, the pointer of the indicator 11 is in the alarm range A. At the same time, an alarm is issued as shown in (d).

[0013] According to this embodiment, the two conductors 6 and 7 are used to change the temperature in the engine room 2. Display the temperature detection and output an alarm when the temperature exceeds the set temperature at the same time. I can do it.

[0014] Note that the number of temperature switches 3 is not limited to four.

[0015]

[Effect of the idea] As explained above, according to this invention, a temperature sensor is connected in parallel to the temperature switch. Since the receiver is equipped with a display means to display the temperature detected by the temperature sensor, it is easy to use. Detection and display of temperature changes in the detected part with a simple configuration and alarm when the temperature exceeds the set temperature This can be done simultaneously with the output.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the temperature detection device of this invention.

FIG. 2 is a diagram illustrating the operation of an embodiment of this invention.

FIG. 3 is an explanatory diagram showing how the temperature detection device is attached to the vehicle body.

FIG. 4 is a wiring diagram showing the configuration of an example of a conventional temperature detection device.

FIG. 5 is a diagram illustrating the operation of the temperature detection device shown in FIG. 4.

[Explanation of symbols]

3 Temperature switch 8 Receiving section 10 Temperature sensor (thermistor) 11 Display means (indicator)

Claims (1)

[Scope of utility model registration request] 1. A temperature detection device comprising at least one temperature switch and a receiving section that receives an opening/closing signal of the temperature switch and issues an alarm, wherein a temperature sensor is provided in parallel with the temperature switch; A temperature detection device characterized in that the receiving section is provided with a display means for displaying the temperature detected by the temperature sensor.