JP2762387B2 - Ceiling mounted temperature sensor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceiling-mounted type temperature sensor which is embedded in a ceiling of a building such as an office, in particular, a ceiling behind a ceiling constituting a return chamber for indoor air.

[0002]

2. Description of the Related Art In buildings such as offices, hotels, hospitals, etc., a temperature control detector is generally installed at a corner or wall in a room or inside a return duct. Controls the air-conditioning equipment and adjusts the indoor living area temperature to the optimal temperature. The temperature detector is generally configured by housing and arranging a temperature sensor in a case, and has a circulation hole through which room air flows in the front of the case. When such a temperature detector is installed on a wall, it is 1.2m from the floor.
It is installed at a height of about 1.5m. Recently, detectors can no longer be mounted on walls, partitions, pillars, etc. due to beautification of walls, efficient use of walls, and the adoption of pillar-free space building structures. There is also. When installing on the ceiling, especially in the interior part where the vertical temperature difference is small because there is a concern that the temperature differs from the living area temperature due to the problem of vertical temperature distribution difference during heating with high air-conditioning temperature and the effect of lighting load. It is desirable to install. However, if the perimeter section (area on the window side in the building) is also expected to have a small vertical temperature difference (inside the perimeter section slit blowout on the ceiling, etc., where perimeterless is provided by double windows, etc.) Can be installed.

[0003]

A detector for temperature control should be installed at a place where the representative temperature of the zone to be controlled can be detected. However, if it is installed on a wall surface or a pillar surface which is a corner in a room, it may be difficult to detect the representative temperature of the indoor living area. In addition, there are many cases where there is no surface to be installed for fine zoning such as a VAV system (variable air volume system). For example, when installed in a return duct, the temperature of the air after the air in the multiple zones is combined will be detected, and when installed in the return chamber, the air in the multiple zones will be detected. Since the temperature of the combined air and the heat generation of the lighting fixture are detected, it is meaningless to finely zone by VAV in any case.

On the other hand, when installing on the ceiling, attention must be paid to the installation location because the temperature differs from the living area temperature due to the vertical temperature difference, especially the problem of heating with a high blowing temperature and the influence of the lighting load as described above. However, when there is no guideline on where to install or should not be installed, and when the supply air temperature during heating is high and the air volume is small, a short circuit occurs between the ceiling outlet and the ceiling intake, and the detection of the installation on the ceiling The vessel is not representative of the living room temperature. In some cases, the sensor output value is corrected for this error, but it is a correction that simply subtracts the seasonal constant value from the sensor output. Also,
The vertical temperature difference in the room changes every moment depending on the difference between the outlet temperature and the room temperature, the outlet wind speed, the state of load generation, and the like. Therefore, it cannot be corrected by simply correcting a constant value in each season. Further, a method for determining the correction value has not been established.

The inventors of the present invention measured the room temperature by changing the structure and installation location of the detector in various ways. When the inside of the ceiling constituted the return chamber, the room and the return chamber were connected via the detector. Then, it was confirmed that the temperature of the living area in the room could be accurately detected with a small error even near the ceiling because air flow occurred in the detector. In particular, the interior section (the inner area of the building)
In, it was possible to make the error extremely small.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems and measurement results, and can detect a living area temperature on a ceiling surface with a small error and improve the response of a sensor. SUMMARY OF THE INVENTION It is an object of the present invention to provide a ceiling-mounted type temperature detector which can be operated.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a case in which the backside of a ceiling is installed on a ceiling forming a return chamber for returning indoor air to an air conditioner.
The air stored in the case and used for controlling the air conditioner
A temperature sensor for detecting temperature;
A communication passage connecting the side and the indoor side is provided in the case.
In addition, the temperature sensor is arranged near the communication path.

[0008]

According to the present invention, the air in the room is sucked by the negative pressure in the return chamber behind the ceiling. Therefore, the air near the indoor ceiling does not stay on the ceiling surface, and the vertical temperature difference is reduced. Since the sensor is exposed to the room air passing through the communication passage, the sensor detects the temperature near the ceiling without being affected by the temperature of the ceiling surface, the ceiling, and the lighting. Since the room air passing through the communication path hits the sensor, the responsiveness of the sensor is improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a sectional view showing an embodiment of a ceiling-mounted temperature detector according to the present invention, FIG. 2 is a partially cutaway front view of the detector, FIG. 3 is a plan view of a case, and FIG. −
FIG. 4 is a sectional view taken along line IV. In these figures, reference numeral 1 denotes a ceiling plate (made of iron), and the back side of the ceiling plate 1 is a return chamber 2
The air blown into the room 3 from the duct on the ceiling is sucked into the return chamber 2 from behind the ceiling lighting device. Reference numeral 4 denotes a temperature detector embedded and installed in the ceiling plate 1. The temperature detector 4 is incorporated through a case 5, a front cover 6 covering a front opening of the case 5, and a substrate mounting plate 8 in the case 5. And a sensor 9 mounted on the wiring board 7.

The case 5 is integrally formed of a flame-retardant material such as ABS resin, and is integrally formed with a body 5a formed of a cylindrical body open at both ends and an outer peripheral surface of a front opening of the body 5a. And a rectangular flange portion 5b provided.
A case mounting hole 10 provided in the ceiling plate 1
The mounting bracket 1 is inserted from the indoor 3 side and has a plurality of flange portions 5 b, for example, two set screws 11, disposed behind the ceiling plate 1 via a rubber magnet 12.
It is fixed to 3. For this reason, a pair of arc-shaped long holes 14 through which the set screw 11 is inserted are formed in the flange portion 5b, and an insertion hole 15 through which the body portion 5a penetrates and a screw hole (not shown) are formed in the mounting bracket 13. Is formed. A large number of slits 16 are provided at the rear end of the body 5a projecting rearward from the mounting bracket 13 to reduce the resistance of the case 5 against the flow of air in the return chamber 2 and communicate the inside and outside of the case 5. While being formed at predetermined intervals in the direction, a step surface 17 and a pair of mounting portions 18 are provided on the inner peripheral surface. The step surface 17 and the front surface 18a of the mounting portion 18 form the same plane.

The front cover 6 is formed in the shape of a square dish slightly smaller than the flange portion 5b, so that a square front portion 6a is provided on each side of the front portion 6a with a predetermined angle inclined rearward. Of the oblique portion 6b, the tip of the oblique portion 6b is fitted into a fitting recess 20 formed in the front of the flange portion 5b, and an engaging claw 21 provided at the center of each oblique portion 6b. Are fitted and locked in engagement holes 22 formed near the outer periphery of the flange portion 5b. A large number of ventilation slits 23 are formed in the front portion 6a of the front cover 6 and the respective oblique side portions 6b so as to communicate the inside and the outside.

The board mounting plate 8 is fitted and disposed so as to partition the inside of the case 5 back and forth, the back surface of the outer peripheral portion is in close contact with the step surface 17 and the front surface 18a of each mounting portion 18, and the set screw 24 is provided. Is fixed to the mounting portion 18. At the center of the front surface of the board mounting plate 8, the sensor 9
The wiring board 7 on which a resistor 26 and the like are mounted to form a predetermined circuit is provided.
Are connected at one end. External code 27 is case 5
Is inserted into the case 5 through an opening on the back side of the case 5 and an intermediate portion is held by an appropriate cord clamp 28. Further, the board mounting plate 8 has a code insertion hole 29 through which the external cord 27 is inserted, and a communication hole 30 for communicating the front and rear inside the case 5. Due to the presence of the communication hole 30, the case 5, in other words, the temperature The entire interior of the detector 4 forms a communication path 31 that connects the return chamber 2 and the chamber 3. The sensor 9 is mounted at the center of the front surface of the wiring board 7.

When mounting the temperature detector 2 having such a configuration, the wiring board 7 on which the sensor 9 is mounted is mounted.
Of the case 5 in which the
Then, the flange portion 5b is fitted into the insertion hole 15 of the mounting bracket 13 from the indoor 3 side to closely position the flange portion 5b on the indoor side surface 1a of the ceiling plate 1, and the flange portion 5b is fixed to the mounting bracket 13 by the set screw 11. Next, the front cover 6 may be fitted into the concave portion 20 of the flange portion 5b, and the engaging claw 21 may be inserted and locked into the engaging hole 22.

The air blown into the room 3 from the duct on the ceiling is sucked into the return chamber 2 from behind the ceiling lighting equipment. A part of the room air near the ceiling enters the temperature detector 4 from the slit 23 of the front cover 6 and is sucked into the return chamber 2 through the communication passage 31, and the temperature of the room air is detected by the sensor 9. To detect. In this case, since the sensor 9 is exposed to the flow of room air, the responsiveness is improved, and the detection accuracy is improved.

FIG. 5 is a diagram showing an outline of an air conditioner. In the figure, 40 is a ceiling plate, 41 is a lighting fixture, 42 is an outdoor, 43 is a wall, 44 is a window glass, 45 is a perimeter part of the room 3, 46 is a room interior part, 47 is a floor, 48 is a suction port, 49 is an air conditioner, 50 is a return chamber, 51
Is a VAV unit, 52 is an air outlet duct, and 53 is an air outlet. 1 to 4 are denoted by the same reference numerals. The air whose temperature has been adjusted by the air conditioner 49 is sent to the VAV unit 51 through the outlet duct 52, the air volume is adjusted, and sent to the room 3 from the outlet 53. The indoor air is sucked into the space above the ceiling (return chamber 2) through the suction port 48 provided near the lighting fixture 41 and the inside of the ceiling-mounted temperature detector 4, and is passed through the return duct 50 to the air conditioner 49. Return. The temperature detector 4
The temperature detected by is sent to a control device (not shown),
Based on this temperature, the control device controls the air conditioner 49 and V
The AV unit 51 is controlled.

Next, in order to evaluate the temperature detector 4 according to the present invention, the present inventors installed the back of the ceiling on the ceiling surface of a general office floor constituting a return chamber and performed various measurements. 6 (a) is a plan view of a standard floor, (b)
Is an A-A 'enlarged sectional view of (a). In the figure,
The same components as those in FIG. 5 are denoted by the same reference numerals. 54 is a thermocouple provided at the temperature measuring point, 55 is a wire, 56 is a fan, 57 is a data recording device, I is a north side perimeter zone, II is an interior north system zone, I
II is the interior central system zone, IV is the interior south system zone, and V is the south side perimeter zone. The thermocouple 54 suspended from the ceiling and the data recording device 57 are specially set for data measurement. Further, the temperature detector 4 is permanently provided.

FIG. 7 shows three points of the upper and lower temperatures (0.1 m, 1.2 m, and 0.1 m from the floor) of the interior part on the reference floor shown in FIG.
2.4m) and the upper and lower temperature distribution charts showing the average values of the air conditioning time zones in which the temperatures detected by the temperature detector 4 are measured for each season, where (A) is the south interior system, (B) is the central interior system, and (B) is the central interior system. C) is the north interior system. In addition,
Dashed line 60 in winter season, the broken line 61 fall, a solid line 62 is the summer season. From this measurement result, the vertical temperature difference between 2.4m and 0.1m in the north interior system in summer is 1.5 ° C at best, and the other temperature is 1 ° C or less, and a large vertical temperature difference occurs. You can see that it is not. This can be caused by
Heating in the building to be measured is limited only to the rise in the morning in winter, and it is considered that a major difference is that there is no large difference in outlet temperature.

FIG. 8 is a diagram showing the temperature distribution of the cross section of the southern zone in the afternoon in winter. From this figure, it can be confirmed that the vertical temperature difference in the interior part is hardly observed. However, in the perimeter section near the window surface, the window surface is heated by the solar radiation, and the heated room air flows to the ceiling surface, causing a large vertical temperature difference.Therefore, there is a problem in installing the sensor on the perimeter ceiling. It appears to be.

FIG. 9 is a diagram showing the frequency distribution of the temperature difference between the ceiling sensor output of the north interior system and the living area 1.2 m in winter. The horizontal axis shows the value obtained by subtracting the temperature of 1.2 m from the sensor output. The vertical axis shows the frequency at which the temperature difference on the horizontal axis appears in the air conditioning time zone. According to this, the temperature difference is within about ± 1 ° C., and it can be said that the ceiling sensor output is representative of the living area temperature.

FIG. 10 shows the measurement of the temperature of 1.2 m of the living area and the temperature set value in order to evaluate the final environmental control.
It is a figure which shows the frequency distribution of the value which subtracted the set value from the living area 1.2m temperature of the air-conditioning time zone. And the temperature difference is ±
Indicates the probability of falling within 1 ° C.

[0021]

[Table 1]

As evident from Table 1, the interior part has a low value except for the southern and central zones, which have low values in winter.
It falls within the set value ± 1 ° C with a probability of% or more. here,
The low probability is due to the fact that the lower limit of the blowing temperature during cooling in winter is set to a high value, and the room temperature did not decrease as set, and is not a sensor-related cause. That is, if a temperature sensor is installed on the ceiling of the interior part so that room air passes through the sensor, it can be said that there is no problem in temperature control. The Table 1 showed the results of Bae Rimeta portion, a very low probability compared to the interior portion. Perimeter section has a large disturbance from the outside,
It can be seen that the temperature distribution occurs horizontally and vertically, and the temporal variation is large, and a more stable environment is not maintained as in the interior. The symbols (A) to (E) in the table are shown in FIG.
They correspond to the symbols (A) to (E) in FIG.

FIG. 11 shows the sensor output depending on the presence or absence of the shielding plate.
It is a figure which shows the difference of the average value of the 1.2 m temperature difference of the living area of an interior part . No shield plate is the temperature detector according to the present invention,
The case with a shield plate is a conventional type, and shows a case where a detector that does not allow communication between the return chamber and the room is used. As is clear from this figure, the temperature difference of the detector of the present invention having no shield plate is only 0.5 ° C. or less, whereas the conventional detector having the shield plate has a temperature difference of 1 ° C. or more. It was found that the temperature difference was different depending on the place and season. The temperature difference tends to be higher in the north than in the south and in the summer than in the winter, and it is considered that the indoor surface does not pass through the detector and is greatly affected by the ceiling surface and the space above the ceiling.

In conclusion, even if the sensor is installed on the ceiling, the return chamber 2 and the room 3 communicate with each other through the communication passage 31 and the sensor 9 is arranged in the communication passage 31 to detect the living area temperature with a small error. It is possible to install the detector at the ceiling of the interior, and there is no problem with temperature control.To minimize the vertical temperature difference in the room as much as possible, strengthen the insulation of the building so that there is no large difference in the temperature of the blowing air. Or, it has been found that it is desirable to set the blowout temperature upper limit lower during heating.

[0025]

As described above, the ceiling-mounted temperature detector according to the present invention has a communication path in the case that connects the return chamber above the ceiling with the room, and a sensor is arranged near the communication path. Because it is configured to detect the temperature near the indoor ceiling, even in a room without a wall or the like on which a sensor representative of the living room temperature can be installed, the living room temperature can be detected with a small error, and the accurate indoor temperature can be detected. Enable control. Further, since the sensor is disposed near the flow passage through which the room air flows, the effect is very large, such as the responsiveness of the sensor is improved and the detection accuracy is improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a ceiling-mounted temperature detector according to the present invention.

FIG. 2 is a partially cutaway front view of the detector.

FIG. 3 is a plan view of a case.

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is a diagram showing an outline of an air conditioner.

6A is a plan view of a reference floor, and FIG. 6B is an enlarged cross-sectional view taken along line AA ′ of FIG.

FIG. 7: Three points of upper and lower temperatures (0.1 m, 1.2 m, and
(A) is a south interior system, (B) is a central interior system, and (C) is a north interior system. .

FIG. 8 is a diagram showing a temperature distribution of a cross section of a southern zone in winter.

FIG. 9 is a diagram illustrating a frequency distribution of a temperature difference between a ceiling sensor output of the northern system and a living area of 1.2 m in winter.

FIG. 10 is a diagram showing a frequency distribution of a value obtained by measuring a temperature and a temperature set value in a living area of 1.2 m and subtracting the set value from the temperature of the living area of 1.2 m in an air-conditioning time zone.

FIG. 11 is a diagram illustrating a difference between a sensor output and an average value of a 1.2 m temperature difference in a living area depending on the presence or absence of a shielding plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Ceiling board , 2 ... Return chamber , 3 ... Room , 4 ... Temperature detector , 5 ... Case , 9 ... Sensor , 31 ... Communication path.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshihisa Murayama 2-12-19 Shibuya, Shibuya-ku, Tokyo Yamatake Honeywell Co., Ltd. (56) References JP-A-4-236026 (JP, A) JP-A-63 −70745 (JP, A) Fully open sho 59-196610 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) E04B 9/02 E04B 1/70 F24F 11/02 G01K 1/14

Claims (1)

(57) [Claims] A case installed on the ceiling forming a return chamber for returning room air to an air conditioner on the back side of the ceiling ;
It is stored in this case and used for controlling the air conditioner.
A temperature sensor for detecting the temperature of the case,
A communication passage connecting the well side and the indoor side is provided in the case.
And a temperature sensor disposed near the communication passage.