JP2820186B2 - Dehumidifier - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehumidifier mainly used for drying grains.

[0002]

2. Description of the Related Art Conventionally, as this type of dehumidifier, there is an apparatus as shown in FIG. In this figure, 1 is a compressor installed in the machine room, 2 is a cooler vertically arranged in the upper part of the machine room in front of the dehumidifier body, 3 is a condenser vertically arranged in the lower part of the main body bypass air passage, and 4 is a cooler. 2. A damper arranged on the upper surface of the main body, 5 is a blower, 6 is a control panel installed in a machine room, and 7 and 7a are condensed from the cooler 2 to take in air by bypassing an air passage passing through the condenser 3. Partition plates provided to form an air path to the vessel 3, 8 and 12 are ducts connecting the main body and the blower 5 and the blower 5 and the storage bin 13, 9 is a panel, 13 is a storage bin for storing grain, 11 Are drain pans for receiving drain water condensed on the cooler 2, 10a, 10b,
Reference numerals 10c denote temperature sensors provided for detecting the ambient temperature, the cooler outlet air temperature, and the condenser outlet air temperature, respectively, which are connected to the control panel 6 and used for controlling the damper 4.

Next, the operation will be described. In FIG. 5, the humid air of high humidity passing through the cooler 2 is cooled and dehumidified by heat exchange with the cooler 2 and then reheated by the condenser 3 to become room temperature dry air slightly heated from the inflow air. Then, the air is blown through the ducts 8 and 12 to the storage bin 13 where the grains are stored by the blower 5 connected locally. Further, the ratio of the amount of air passing through the cooler 2 is adjusted by the damper 4 arranged on the upper surface of the main body so that the dehumidifying ability is always maximized depending on the humidity of the inflow air. Note that whether the dehumidifying capacity is maximum is determined by the following equation, and the temperature sensor 10a,
Assuming that the detected values of 10b and 10c are T, T ₁ , and T ₂ , the dehumidification amount becomes maximum when the following equation is satisfied between the temperatures. f (t) = T ₂ + C ₁ × T ₁ + C ₂ × T + C ₃ = 0 (coefficient C ₁ = 0.739, C ₂ = −1.934, C ₃ =
2.292)

During operation, the damper 4 is operated so that the above equation is satisfied.
Adjust the opening of. For example, when the state of the humidity of the incoming air is humid, since the outlet air temperature T ₁ of the cooler 2 is higher than in the case of low humidity, also increases the outlet air temperature T ₂ of the condenser 3, the above formula The calculated value is greater than zero. In this case, by operating the damper 4 in the closing direction, by controlling to increase the amount of air passing through the cooler 2, to satisfy the above equation lowering the condenser outlet air temperature T _2. On the other hand, when the humidity of the inflow air is low, the damper 4 is operated in the opening direction to control the amount of air passing through the cooler 2 to be reduced. Further, the control panel 6 includes temperature sensors 10a, 10
Based on the detected values T, T ₁ , and T _{2 of} b and 10c, a function of calculating the humidity of the suction air and the humidity of the blast air is provided. Depending on the type of grain, the humidity of the blast air is determined in advance so as not to be over-dried. When the value becomes equal to or less than the value set in the control panel 6, the operation of the compressor is stopped. Other and during defrosting, the amount of air due to the filter clogging or the like is reduced, for when it becomes more than is the condenser outlet air temperature T ₂ values also,
Shutting down the compressor to prevent grain deterioration.

[0005]

SUMMARY OF THE INVENTION The conventional dehumidifier is,
Since the cooler 2 is installed vertically above the machine room, the height of the unit is increased. In addition, the condenser 3 needs to be installed at a position below the cooler 2 and at regular intervals in order to secure a bypass air passage, a space in a machine room, and a service space for cleaning the drain pan 11 and the like. For this reason, there are structural problems such as the necessity of the partition plates 7 and 7a for forming the heat exchanger air passage, the increase in unit height and the installation area, and the necessity of securing a side service space.

In addition, the damper is controlled not only in response to a change in air volume due to a change in air path resistance on the storage bin side, but also has an additional function of controlling the dehumidification capacity to be maximum depending on the ambient humidity. However, when a microcomputer and a temperature sensor are used, the price of the control panel increases, which has contributed to the increase in the price of the dehumidifier itself.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can reduce the size of the dehumidifier body, can cope with a change in air volume due to a change in downstream air path resistance, and can further reduce the cost. The purpose of the present invention is to obtain a dehumidifier.

[0008]

A dehumidifier according to the present invention passes through a dehumidifier using a refrigeration cycle including a compressor, a condenser, a throttle device, and a cooler, and the cooler and the condenser. A dehumidifier provided with a damper provided in a second air passage for bypassing the first air passage to take in air, wherein an air inlet formed on the upper front side of the dehumidifier;
An air outlet formed on the upper back side of the dehumidifier, a partition plate also serving as a drain pan for separating the first air passage leading from the air inlet to the air outlet and a space below the first air passage; An opening having the damper formed at an upper portion thereof, and the compressor and the expansion device are provided in a space below the partition plate, and the cooler is provided in a space above the partition plate for the dehumidifier. In this configuration, the upper front side is higher and the upper rear side is lower, and the condenser is arranged above the cooler. In addition, a configuration is also provided that includes a control unit that controls the opening of the damper in accordance with the amount of change in the static pressure caused by the passage of air through the cooler and the condenser. Further, there is also a configuration provided with a control means for detecting a static pressure downstream of a filter provided on the upstream side of the cooler and stopping the operation of the compressor when the detected value becomes equal to or less than a set pressure. .

[0009]

The dehumidifier according to the present invention comprises a space inside the dehumidifier body for accommodating a compressor, a control panel and the like, a cooler 2 and a condenser 3.
By separating the air passage that passes through with a partition plate that also serves as a drain pan, the cooler and the condenser approach each other, and the unit front side is tilted high and arranged above the partition plate.
The size of the dehumidifier body can be easily reduced, and services such as cleaning the inside of the dehumidifier body from the front of the dehumidifier body can be performed. Also, by detecting the difference in static pressure caused by the passage of air through the cooler / condenser, and adjusting the opening of the damper, it is connected to this dehumidifier to reduce the air path resistance on the device side. Even if the air volume changes due to the change, the air volume of the heat exchanger can be controlled to be constant and the operating conditions of the dehumidifier can be secured. Further, it is possible to prevent a failure caused by the air volume control failure due to clogging of the air filter or the like.

[0010]

【Example】

Embodiment 1 FIG. Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a diagram showing a configuration of a dehumidifier body according to the present invention, in which a cooler 2 and a condenser 3 are arranged close to each other, and are inclined at an elevated front side. As a result, the conventional partition plates 7 and 7a as shown in FIG.
1 also serves as a partition plate with the machine room. Reference numeral 15 denotes a suction grill. By removing the suction grill, the drain pan 11 can be cleaned, and front service including machine room service can be performed. Other configurations are the same as the conventional example.

FIG. 2 shows a detection position of a static pressure for controlling the damper 4, and FIG. 3 is a diagram showing an example of a control circuit thereof. Reference numerals 20 to 22 indicate pressure switches. As shown by arrows in the figure, the wind flows in the direction from A to C, that is, from the cooler 2 to the condenser 3. Further, a difference between static pressures generated in the condenser 3 from the cooler 2 is detected by the pressure switches 20 and 21. The detection position may be any two points of A, B, and C,
The control becomes easier by selecting points A and C where the amount of change is large. The pressure switches 20 and 21 are used to determine the difference between the static pressures at points A and C when the lower limit air flow is applied to the pressure switch 20 so that the dehumidifier can operate within the guaranteed operating temperature range. The difference in the static pressure between points A and C when the upper limit air flow is applied to the side is set, respectively.

Next, in FIG. 3, reference numerals 20a and 21a denote contact points of the pressure switches 20 and 21, FIG. 3 denotes a damper motor for driving the damper 4, 23a and 23b denote limit switches incorporated in the damper motor, and the damper 4 is fully opened. Alternatively, the contacts are opened when fully closed to stop the energization of the damper motor and protect the motor. 24,
Reference numeral 25 denotes a timer, and reference numerals 24a and 25a denote time limit operation contacts of the timers 24 and 25. To avoid the influence of pressure pulsation, the damper motor 23 is not energized unless the contact 20a or 21a of the pressure switch operates for a certain period of time.

FIG. 4 shows a flowchart of the damper control. First, a difference in static pressure between points A and C is detected, and this value is compared with the set values of the pressure switches 20 and 21. When the air volume is insufficient, the difference in static pressure becomes smaller than the set value of the pressure switch 20. Therefore, after counting the set time of the timer 24, the contact 24a on the closing operation side is turned on, the power is supplied to the damper motor 23, and the damper 4 is closed. This increases the air volume on the heat exchanger side. However, when the limit switch 23b is operating, the power is not supplied to the damper motor 23. next,
When the detected value is between the set values of the pressure switches 20 and 21, it is determined that the air flow is appropriate, and the damper 4 does not operate. Further, if the air flow is excessive, the difference in the static pressure becomes larger than the set value of the pressure switch 21. Therefore, after the set time of the timer 25 is counted, the contact 25a on the closing operation side is turned on, and the damper motor 2
When 3 is energized and the damper 4 opens, the air volume on the heat exchanger side is reduced. At this time, when the limit switch 23a is operating, the power is not supplied to the damper motor 23.

Finally, the operation of the pressure switch 22 shown in FIG. 2 will be described. If the air filter located upstream of the point A is clogged for some reason, the air flow on the heat exchanger side becomes insufficient and the damper 4 is controlled to close so as to compensate for this. If the air volume becomes insufficient due to clogging, the control becomes out of the control range of the damper 4, and the dehumidifier cannot be operated or causes a failure. Further, when clogging occurs, the static pressure downstream of the clogging becomes lower than usual, so this is detected by the pressure switch 22 and the compressor 1 is stopped.

[0015]

As described above, in the dehumidifier according to the present invention, the cooler / condenser is approached, and the dehumidifier is arranged at the top of the dehumidifier body at an angle so that the front side thereof is higher. By separating the machine room with a drain pan,
The size of the dehumidifier body can be easily reduced, and services such as drain pan cleaning, which have been conventionally performed from the side, can be used as front services. It also detects the difference in static pressure caused by the passage of air through the cooler / condenser, and adjusts the damper opening. Can be controlled to be constant even if the air pressure changes. Further, it is possible to prevent a failure caused by the air volume control failure due to clogging of the air filter or the like.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a dehumidifier according to one embodiment of the present invention.

FIG. 2 is a diagram showing a detection position of a damper control pressure switch according to an embodiment of the present invention.

FIG. 3 is a diagram showing a damper control circuit according to one embodiment of the present invention.

FIG. 4 is a flowchart illustrating a damper control method according to an embodiment of the present invention.

FIG. 5 is a configuration diagram of a conventional dehumidifier.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Cooler 3 Condenser 4 Damper 5 Blower 6 Control board 7 Partition plate 1 7a Partition plate 8,12 Duct 9 Panel 10a Suction air temperature sensor 10b Cooler outlet air temperature sensor 10c Condenser outlet air temperature sensor 11 Drain pan 13 Storage bin 15 Suction grille 20-22 Pressure switch 23 Damper motor 24, 25 Timer

Claims (3)

(57) [Claims] 1. A dehumidifier using a refrigeration cycle including a compressor, a condenser, a throttle device, and a cooler, and a first air passage passing through the cooler and the condenser to obtain air. A dehumidifier provided with a damper provided in a second air passage into which air is introduced, an air inlet formed on an upper front side of the dehumidifier, an air outlet formed on an upper rear side of the dehumidifier, and A partition plate which also serves as a drain pan for partitioning the first air passage leading from the suction port to the air outlet and a space below the first air passage, and an opening formed above the dehumidifier and having the damper; The compressor and the squeezing device are arranged in the lower space of the dehumidifier, and the cooler is arranged in the space above the partition plate such that the upper front side of the dehumidifier is higher and the upper rear side is lower. And further above the cooler A dehumidifier comprising the condensers arranged side by side. 2. The apparatus according to claim 1, further comprising control means for controlling an opening of the damper in accordance with an amount of change in static pressure caused by passage of air through the cooler and the condenser. 2. The dehumidifier according to claim 1. 3. A control means for detecting a static pressure downstream of a filter provided on the upstream side of the cooler, and stopping the operation of the compressor when the detected value becomes equal to or lower than a set pressure. The dehumidifying device according to claim 1, wherein: