JPS6367234B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a differential sensor testing device. The differential type sensor has the configuration shown in Figure 1, and when there is a sudden temperature rise in the event of a fire, the air inside the heat sensitive chamber 1 expands, pressurizing the diaphragm 2 and closing the contact 3. In response to slow temperature changes due to heating or the like, the leak hole 4 maintains a balance with the external pressure and prevents non-fire alarms.
In other words, it is activated when the ambient temperature exceeds a certain temperature increase rate, and is activated by the local thermal effect. By the way, the operation and non-operation tests of such differential sensors are now conducted based on the inspection service regulations by the Certification Association, and the table below shows the test items.

[Table] Here, the operation test includes stair climbing and straight-line climbing, and in the former, the wind speed is Vcm/
In the latter case, it is tested that the device operates within N seconds when exposed to an air flow of 2 seconds, and in the latter case, it is tested that it operates within M minutes when an air flow that linearly rises from room temperature at a rate of T°C/minute is applied. . In addition, in the inoperability test, there is a stair-climb test to test that the device does not operate within n minutes when the airflow is placed in an airflow with a wind speed of Vcm/sec that is K°C higher than room temperature, and an airflow that linearly rises from room temperature at a rate of t°C/min. There is an item called linear rise that tests that it does not operate within m minutes when applied. Among these tests, the equipment used to perform the stair climbing test is the one shown in Figure 2, which was previously set up by the Certification Association.
I found a device like the one shown in ab. The device shown in the figure has nichrome wires 6 arranged in a lattice pattern in two tiers, upper and lower, in the bottom of a rectangular cylinder 5 with a square cross section that constitutes a wind tunnel section, and generates heat by generating heat from these nichrome wires 6. A differential sensor 8 generates a natural hot air flow x and is placed in the center of the upper part of the rectangular cylinder 5 by a bridge body 7.
The velocity of the natural hot air stream By adjusting the gap y between them and adjusting the flow of air flowing in from below the rectangular cylinder 5, the values determined in the table above can be set. In the figure, 11 is a rod-shaped thermometer for measuring the temperature near the differential sensor 8, and 12 is an indicator thermometer. By the way, since this conventional device uses a natural air flow system, it is sensitive to changes in ambient temperature and wind speed, and the variation range is large. Conditions need to be improved. Furthermore, in order to maintain temperature and wind speed accuracy, it is necessary to make the wind tunnel section longer, and the length of the wind tunnel section set by the Certification Association is 180 cm as shown in the diagram.
was also necessary. Therefore, as shown in Fig. 3a, it must be recessed into the floor, or it must be installed in a location that takes into account the influence of the ceiling height, and the work scaffold 13 must be installed as shown in Fig. 3b. It was hot. Furthermore, when setting the temperature and wind speed to predetermined values in each sensor type (1 type, 2 type), activation, and non-operation test, adjust the gap y by moving the adjustment screw 10 as described above. Since this was done using a method, it took a long time to set up and had the drawbacks of poor stability. Furthermore, since the rectangular tube 5 is long due to its structure, it is difficult to take out the sensor 8 to be tested if it falls into the rectangular tube 5, and it is also difficult to replace it if the nichrome wire 6 of the heat source breaks, making maintenance difficult. There was a problem. Furthermore, the sensor 8 to be tested is attached to the lower center of the bridging body 7 and the bridging body 7 is placed in the upper opening of the rectangular cylinder 5 by a so-called throwing method. This has disadvantages in that workability is poor because of the setting position, and in addition, the airflow may vary depending on the deviation or inclination of the setting position, causing variations in operating time. Furthermore, because of the above-mentioned method, the inspector had to work standing up, as shown in Figures 3a and 3b, which caused great fatigue. Furthermore, since temperature control is performed by adjusting the voltage supplied to the nichrome wire 6 using a slide transformer, it is susceptible to voltage fluctuations, etc. Furthermore, depending on the way the nichrome wire 6 is stretched, it may be used in places where the winding density is high. There was a drawback that the temperature distribution inside the rectangular tube body 5 was different due to the occurrence of low temperatures. Conventional equipment has many problems as mentioned above, and in particular, it takes too much time to adjust temperature and wind speed to the optimum values when testing a large number of sensors. Ta. The present invention has been made in view of the above-mentioned drawbacks.
The main purpose is to be able to stably control temperature and wind speed to meet the set values for the specified test without being affected by environmental changes, and to reduce the overall height dimension. Our objective is to provide a differential type sensor testing device that can be used easily and is not limited to the location where it can be used.A secondary purpose is to provide a differential type sensor test device that is easy to maintain and inspect, is highly workable, and can be automated for testing. To provide sensor testing equipment. The present invention will be explained below with reference to Examples. FIG. 4 shows a schematic configuration diagram of one embodiment, and in the figure, 14 is a cylinder made of a material with excellent heat insulation properties, such as wood. It is erected on the inner bottom and forms a wind tunnel section together with the four-period cover 15. In the example, this wind tunnel section has a height of approximately
It is set in the range of 0.7 to 1.5m. Although the cylindrical body 14 has a rectangular cylindrical shape in the embodiment, it may of course have another shape such as a cylindrical shape. Now, the inner circumference of the four-circle covering body 15,
There is a gap between the cylindrical body 14, this gap forms an air flow passage, and the upper end opening of the gap constitutes the air sulfur inlet 16 into the wind tunnel section. A filter 17 is disposed at the bottom of the cylindrical body 14, a motor 19 for driving a blower fan 18 is disposed slightly above the filter 17, a rectifier unit 20 is disposed above the blower fan 18, and A heat source heater 21 is provided above the rectifier unit 20, and rectifier units 22, 2 are further provided above the heat source heater 21.
There are 3. At the top of the cylinder 14, a conveyor 25 is provided, which is made up of a linear motor 24, for moving the differential sensor 8 to be tested to a predetermined position within the cylinder 14. 26 is a guide rail of the carrier 25. A temperature sensor 26 is installed at a position slightly below the fixed position where the differential sensor 8 to be tested is placed to detect the temperature inside the cylinder 14, and a temperature sensor 26 is installed at a position slightly below the temperature sensor 26 to measure the wind speed. Wind speed sensors 27 are respectively arranged for detection. 2
8 is a known digital thermometer, and this digital thermometer 28 is used to calculate and display the difference temperature between the temperature detected by the temperature sensor 29 that detects the room temperature and the temperature detected by the temperature sensor 29 inside the cylinder body 14. The temperature controller 30 that outputs the calculated signal to the temperature controller 30 has a temperature control circuit using known phase control, and as shown in FIG. The conduction phase angle of the thyristor is controlled to control the electric power of the heat source heater 21, so that the temperature inside the cylinder body 14 is controlled to a predetermined value. 33 in Figure 5 is a recorder, digital thermometer 2
This is a recorder that records the temperature inside the cylindrical body 14 on recording paper based on the calculated signal of 8. By the way, the above-mentioned temperature controller 30 automatically controls the temperature inside the cylindrical body 14 based on the calculated signal from the digital thermometer 28. It goes without saying that a manual method of adjusting the conduction phase angle of the thyristor 35 using the voltage adjustment variable resistor 34 of the controller section 32 as shown in FIG. be. 36 in FIGS. 5 and 6 is a stabilized power supply section of the temperature controller 30. In FIG. In FIG. 4, 37 is a so-called anemo master anemometer that uses the detection signal of the wind speed sensor 27 to calculate and display the wind speed.
The calculated signal is input to the speed controller 38, and the speed controller 3
Reference numeral 8 is used to control the rotational speed of a motor 19, such as a DC servo motor, which drives the blower fan 18, so that the wind speed is constant.As shown in FIG. 7, a control unit 39 and a comparator 40 are used. The anemometer 37
The calculation signal inputted from the motor 19 is compared with a reference value, and the rotation speed of the motor 19 is controlled through a control unit 39 so that the calculation signal and the reference value match. Control unit 39
is constituted by a known circuit that varies the rotational speed of the motor 19 by controlling the voltage applied to the motor 19 in accordance with the comparison output of the comparator 40, for example. Of course, the control unit 3 monitors the recorder 42 connected to the anemometer 37.
A manual control method may be used in which the wind speed can be set to a predetermined value using a manual variable means provided at 9, or it may be possible to select and switch between automatic control and manual control. FIG. 8 shows a circuit block diagram for manual control. By the way, the above rectifier unit 2
For example, if the length of one side of the cylindrical body 14 is approximately 30 cm, a metal plate 4 with a thickness of about 1 to 2 mm is placed in a frame 43 with a side of 30 cm as shown in FIG.
4 are combined in a grid pattern to form a 5 cm square grid, and the airflow generated by the blower fan 18 is rectified by each grid section of this rectification unit 20 to create a uniform upward airflow. It is intended to form a Another rectifier unit 22 is the first rectifier unit 22.
As shown in Figure 0, a frame body 43' is made by stacking a plurality of mesh bodies (wire mesh bodies) 45 having meshes of 1 mm square or 2 to 3 mm.
This rectifier unit 22 rectifies the air flow more finely and uniformly, and also applies frictional force to the air flow in each mesh lattice part to suppress its speed and generate the desired minute wind speed. I'm starting to do that. Further, the upper rectifier unit 23 is the 11th rectifier unit 23.
As shown in the figure, a honeycomb-shaped window hole 46 is provided to further rectify the air flow rectified by the above-mentioned rectifier units 20 and 22, and the differential sensor 8 to be tested is placed. This is to prevent turbulence of airflow within the upper part of the cylinder 14. The heat source heater 21 is formed into a unit shape by arranging nichrome wires in parallel, for example, and is for heating the air flow rising through the rectifier unit 20. controlled as follows. Of course, various heaters such as a micro heater, a honeycomb heater, an infrared heater, etc. may be used as the heat source heater 21. These rectifier units 20, 22, 23, heat source heater 21, and the filter 17
The door body 51, which is pivotably mounted to open and close, is opened and placed in the cylinder 14, making it easy to perform periodic inspections and replace the unit. Reference numeral 47 in FIGS. 9 and 10 is a unit locking pawl, which locks onto a guide 48 within the cylindrical body 14. As shown in FIGS. 49 is a caster provided on the external bottom surface of the four-period covering body 15;
The casters 49 allow the device to move freely. Of course Caster 4
9 is unnecessary when this device is fixedly installed. When the device is turned on, the temperature sensor 26 detects the room temperature. Here, if the set value of the temperature controller 30 is set in advance so as to obtain a predetermined temperature rise, the temperature controller 30 will be controlled by the thyristor 35 in the controller section 32.
By setting a large conduction phase angle, a large amount of power is given to the heat source heater 21. On the other hand, in the speed controller 38, the initial wind speed sensor 27
Since the detection speed of motor 19 is small (no wind), motor 19
The controller unit 3
9 to control the motor 19. Therefore, air flows in from the air inlet 16, and a strong columnar air flow is generated from between the filter 17 and the bottom of the four-ring cover 15 upward through the filter 17. The wind speed detected by the wind speed sensor 27 is thus displayed by the anemometer 37, recorded by the recorder 42, and fed back to the speed controller 38 via the anemometer 37, and the speed controller 38 receives the feedback signal. The rotation speed of the motor 19 is continuously controlled so that the wind speed sensor 27 detects the set value based on the set value. On the other hand, the temperature of the air flow is detected by the temperature sensor 26, and this detected temperature and the temperature sensor 2 for detecting the room temperature
The difference between the temperature and the detected temperature of 6 is calculated by the digital thermometer 28 and displayed, and is also recorded by the recorder 33. Feedback is also sent to the temperature controller 30 via the digital thermometer 28, and the temperature controller 30 controls the conduction phase angle of the thyristor 35 of the controller section 32 based on the comparison output of the comparator 31 between the set value and the input calculation signal. The power supply to the heat source heater 21 is continuously controlled. In this way, each sensor 26, 27
To obtain stable wind speed and temperature by continuously controlling the wind speed and temperature based on feedback signals from the air flow, and to obtain uniform temperature distribution and undisturbed uniform air flow by each rectifier unit 20, 22, and 23. will be possible. In other words, even if the room temperature changes, this change is detected by the temperature sensor 26 for room temperature detection, and the digital thermometer 26 immediately detects the change.
8 is given to the temperature controller 30, and the temperature controller 30 immediately starts the heat source heater 2.
1 can be controlled to an appropriate value. Furthermore, even if changes in air flow occur due to the movement of people outside, the air inlet 16 is raised above the floor, so the inside of the wind tunnel will not be directly affected, and even if it is affected, each rectifier unit 20, 2
2 and 23, and the rotational speed of the motor 19 can be immediately controlled to an appropriate value based on the feedback signal from the wind speed sensor 27. Furthermore, the flow of the airflow is rectified and suppressed by the rectification units 20, 22, and 23, thereby making it possible to generate an airflow without turbulence. Now, when the wind speed and temperature are stabilized at the set values, the differential sensor 8 to be tested is mounted on the carrier 25 using the mounting jig 50.
When installed and the linear motor 14 is operated, the differential sensor 8 moves along the guide rail 26 together with the mounting jig 50 to a predetermined position in the upper center of the cylinder 14, and at a predetermined temperature and a predetermined wind speed, Tests are conducted to see if it works or not. In the above embodiment, the blower fan 18 and the motor 19
Although the air blowing means consisting of the above is provided at the lower part of the wind tunnel section to blow up the air, it is of course possible to suck the air up from the upper part of the wind tunnel section. Further, although the blower fan 18 is of a propeller type, it may be a Sirotskov fan. Also, as a rectifier unit, the
As shown in Figure 2, a large hole 53 is drilled in the center,
Fins 52 may be provided on the periphery of the opening of this large hole to give the airflow a spiral character, or fins may be provided on the inner wall of the cylinder 14 to achieve the same effect. Further, the number of rectifier units is not limited to the embodiments, and may be larger than the number of the embodiments, and the structure of the rectifier units may be of a structure that rectifies the airflow and suppresses turbulence. However, the present invention is not limited to the examples. Of course, it is desirable to arrange a rectifier unit above the heat source heater 21 so that the radiant heat of the heat source heater 21 does not directly affect the differential sensor 8 under test above, but the influence of the radiant heat This structure is not particularly limited as long as it can prevent this. Further, although the conveyor 25 is driven by the linear motor 24, other driving means may be used. Further, by uniformly distributing the airflow, the opening of the cylinder 14 may be made large so that a plurality of differential sensors 8 can be tested at one time. The starting signal for the carrier 25 may be manual or automatically controlled, and when the differential sensor 8 to be tested is mounted on the mounting jig 50 of the carrier 25, an air cylinder or the like may be used. Of course, it may be installed automatically by means of a driving means, or it may be installed manually. The present device may also be used as a testing device for other types of sensors than the differential type. FIG. 13 shows another embodiment of the present invention, in which, in addition to the heat source heater 21, another heat source heater 21' is provided, and this heat source heater 21' is an uncontrolled fixed heat source. Similarly to the embodiment in FIG. 4, the temperature is controlled by a temperature controller 30 based on the feedback signal from the temperature sensor 27. The heat source heater 21 of the embodiment in FIG. 13 and the embodiment in FIG. 4 is controlled by phase control of the thyristor 35, but as a control means,
Of course, PID semiconductor control means may also be used. The present invention includes a cylindrical wind tunnel section, a motor-driven blowing means for generating an air flow rising in the wind tunnel section, a heat source heater for heating the air flow generated by the blowing means, and a heat source heater for heating the air flow generated by the blowing means. A rectifier for controlling the rectification, a temperature sensor for detecting the temperature near the installation position of the differential type sensor to be tested in the upper part of the wind tunnel, and a wind speed sensor for detecting the wind speed are provided in the wind tunnel, and the motor of the blowing means is installed. Equipped with a speed controller that controls rotation and a temperature controller that controls the amount of power supplied to the heat source heater, the speed controller controls the detected wind speed value based on the detected wind speed value of the wind speed sensor so that it becomes the test set value. At the same time, the temperature controller controls the amount of power supplied to the heat source heater based on the temperature detected by the temperature sensor so that the detected temperature corresponds to the temperature rise value of the test setting. By rectifying and suppressing the airflow, the airflow can be uniformly distributed, and by using the temperature controller and speed controller, the temperature and wind speed can be forcibly set to appropriate condition values, making it possible to prevent changes in the external environment. Optimum test conditions with less variation in temperature and wind speed can be obtained without having to be exposed to any heat, and as a result, the operating time characteristics of the differential sensor under test are more stable than in tests using conventional test equipment. As a result, accurate testing can be carried out, which improves the yield of products.Furthermore, the air speed and temperature conditions can be set using electrical control, making it possible to perform one or two types of products, as well as whether they are active or inactive. Conditions corresponding to the test items can be quickly set, improving test work efficiency.Furthermore, since forced airflow is used, the length of the wind tunnel can be shortened, eliminating restrictions on where it can be used, and allowing for downsizing. This has the effect of making relocation easier. Furthermore, if a door is provided in the wind tunnel section, internal maintenance and inspection will be easier, and it will be especially convenient for replacing the heat source heater, rectifier unit, fan, and filter.
Furthermore, even if the differential sensor under test falls into the wind tunnel, it is easy to take it out from above because the wind tunnel is short, but it can also be taken out easily through the door. Furthermore, by providing a transporter, the differential type sensor to be tested can be placed in a fixed position, so that the test can be performed without variation, the fatigue of the test operator is reduced, and automation is also possible.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram of a differential sensor, Figures 2a and b are longitudinal sectional views and top views of the conventional example, and Figures 3a and 3 are
Fig. 4 is a sectional view showing a schematic configuration of an embodiment of the present invention, Fig. 5 is a schematic circuit block diagram of the temperature controller shown above, and Fig. 6 shows a temperature controller other than the above temperature controller. FIG. 7 is a schematic circuit block diagram of the same speed controller as above, FIG. 8 is a schematic circuit block diagram of another example of the same speed controller, and FIGS. 9 to 12 are respectively the same as above. Perspective view of rectifier unit,
FIG. 13 is a sectional view showing a schematic configuration of another embodiment of the present invention. 8 is a differential sensor, 14 is a cylinder, 15 is a four-circle cover, 16 is an air inlet, 17 is a filter, 18 is a blower fan, 19 is a motor, 21 is a heat source heater,
20, 22, 23 are rectifier units, 25 is a conveyor, 26 is a temperature sensor, 27 is a wind speed sensor, 28
is a digital thermometer, 29 is another temperature sensor, 30
is a temperature controller, 37 is an anemometer, 38 is a speed controller, and 51 is a door.

Claims (1)

[Scope of Claims] 1. A motor-driven air blower that includes a cylindrical wind tunnel and generates an air flow rising inside the wind tunnel, a heat source heater that heats the air flow generated by the air blower, and A rectifying means for rectifying and suppressing the flow of air, a temperature sensor for detecting the temperature near the installation position of the differential type sensor to be tested in the upper part of the wind tunnel section, and a wind speed sensor for detecting the wind speed are provided in the wind tunnel section,
It is equipped with a speed controller that controls the rotation of the motor of the air blowing means and a temperature controller that controls the amount of power supplied to the heat source heater, so that the detected wind speed value becomes the test condition value based on the detected wind speed value of the wind speed sensor. In addition to controlling the temperature with a speed controller, the temperature controller controls the amount of power supplied to the heat source heater based on the temperature detected by the temperature sensor so that the detected temperature corresponds to the temperature increase value of the test conditions. Features: Differential sensor test equipment. 2. The differential sensor testing device according to claim 1, characterized in that the air blowing means is installed at the lower part of the wind tunnel section. 3 A first rectifier unit is placed above the air blowing means, a heat source heater is placed above this first rectifier unit, a second rectifier unit is placed above the heat source heater, and a third rectifier unit is placed above this heat source heater.
3. A differential sensor testing apparatus according to claim 1 or 2, characterized in that a rectifying unit is provided and these rectifying units constitute a rectifying means. 4. A wind tunnel section is constituted by a cylinder and a bottomed cylindrical four-circle cover arranged to surround approximately the lower half of the cylinder, and the outer circumference of the cylinder and the inner circumference of the four-circle cover are 2. The differential sensor testing device according to claim 1, wherein the gap between the gaps is used as an air inflow path, and the opening at the end of the air inflow path is used as an air inflow port. 5. Claim 1, characterized in that a digital thermometer is provided to calculate and display the difference between the temperature detected by the temperature sensor and the room temperature, and the temperature control is controlled based on the output of the thermometer. differential sensor test equipment. 6. The differential sensor testing device according to claim 1, characterized in that an anemometer is provided to display the detected wind speed of the wind speed sensor, and a speed controller is controlled by the output of the anemometer. 7. The differential sensor testing device according to claim 1, characterized in that the temperature controller is provided with manual operation means. 8. The differential sensor testing device according to claim 1, characterized in that the speed controller is provided with manual operation means. 9. The differential sensor testing device according to claim 1, characterized in that a filter for removing dust from the airflow is provided in the wind tunnel section. 10. A differential sensor testing device according to claim 1 or 9, characterized in that a door that can be opened and closed is provided in the wind tunnel section, and a filter, a rectifier, and a heat source heater can be taken out from the door. . 11. The differential sensor testing device according to claim 1, further comprising a conveying means for moving and placing the differential sensor under test at a predetermined position in the upper part of the wind tunnel section.