JPH03186314A - Dehumidifier - Google Patents

Abstract

PURPOSE:To make it possible to maintain an operation in a maximum usable region by correcting opening of valve of a throttling device when delivery gas temperatures in a compressor exceed a specified value. CONSTITUTION:When the delivery gas temperatures in a compressor 1 remain within a usable limit of the compressor 1, opening degree of valve of a throttling device 3 is set at values corresponding to temperatures detected by wet and dry bulb temperature sensors 7, 8 to perform an operation. When the delivery gas temperatures exceed the usable limit of the compressor 1, a temperature sensor 19 detects said temperatures and sends signals to a control device 9. In the control device 9, correcting signals corresponding to correction values stored in advance in a memory 13 are sent to a drive device 17, whereby the opening of valve of the throttling device 3 is corrected to maintain the operation. As a result, the operation can be continued.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a dehumidifying device that applies a refrigeration cycle to lower the humidity in a room and thereby dry articles.

[Conventional technology]

This type of conventional dehumidification device is constructed as shown in FIGS. 2 and 3. In FIG. 1, (1) is a compressor; (1) is a compressor;
2) is a condenser, 31 is a throttle device, and (4) is a cooler, which are connected in sequence to form a refrigerant circuit. A blower (7) leading from the cooler (4) to the condenser (2) as shown.

(8) is a temperature sensor (91) that detects the dry bulb temperature and wet bulb temperature of the dehumidified air flowing into the cooler (4).
is a control device that adjusts the valve opening of the throttle device (31) according to the temperatures detected by these temperature sensors (7) and 8, and is configured as shown in FIG.

(Ill is a microcomputer with a CPU (central processing unit) (12), memory (13), input circuit (10
, and an output circuit (15). (16) is an A/D that inputs the output signals of the dry bulb and wet bulb temperature sensors (7) and (8) and converts them from analog signals to digital signals.
The converter (17) is a drive device that drives the throttle device (3) to adjust the valve opening based on the output signal from the output circuit (15), and (18) is the same as this drive device (17). , based on the output signal from the output circuit (!5), the blower (6)
This is a rotational speed control device that controls the rotational speed by adjusting the voltage applied to the motor, and has a built-in triac (not shown) to control the cut rate of the power supply voltage waveform.

Next, the operation will be explained. First, the psychrometric temperature sensor (
7) and 8 detect the psychrometric temperature of the air to be dehumidified which is introduced into the cooler (Ill). The detected signal is A/D
The signal is introduced into the microcomputer (11) via a converter (16). Inside the microcomputer (11), the optimum valve opening degree according to the psychrometric temperature of the air to be dehumidified flowing into the cooler (4) is stored in the memory (13). By taking it out, the drive device (17) adjusts the valve opening degree of the throttle device (3). Fifth
The figure shows memory (13) in a microcomputer (11).
It is a characteristic diagram showing the relationship between the valve opening degree of the throttling device (3) stored in the diaphragm device (3) and the temperature of the dehumidified air flowing into the cooler (4).As is clear from the figure, when the psychrometric line temperature is low, the valve opening When the opening degree is small, the valve opening degree is set to be large when the opening degree is high.

In addition, regarding the rotation speed control of the blower (6), in the same way as the above-mentioned valve opening adjustment, the optimum rotation speed (in addition to the blower motor 6 is stored in the memory (13), the rotation speed control device (18) adjusts the rotation speed of the blower (6) in accordance with the input signal. ) is a characteristic diagram showing the relationship between the effective voltage applied to the blower (4) and the difference in psychrometric temperature of the air to be dehumidified flowing into the cooler (4), which is stored in the memory (13) in As is clear from the figure, when the dry-wet-bulb temperature difference is small, the effective voltage is set high to increase the rotation speed of the fan (6), and when the dry-wet-bulb temperature difference is large, the effective voltage is set low to increase the rotation speed of the fan (6). The rotation speed is controlled low.

[Problem to be solved by the invention]

The conventional dehumidification device is configured as described above, and includes a throttling device (3
) is controlled by the temperature of the dehumidified air flowing into the cooler (4), so if this temperature rises, the compressor (
There were problems such as 1) in which the discharged gas exceeded the upper limit of use, making it impossible to maintain operation and causing breakdowns.

This invention was made to solve these problems, and it is an object of the present invention to provide a dehumidifying device that can maintain operation even under conditions where the temperature of discharged gas from the compressor exceeds the upper limit of use of the compressor. purpose.

[Means to solve the problem]

The dehumidifying device according to the present invention detects the temperature of the gas discharged from the compressor, and when the detected temperature exceeds a predetermined value, corrects the valve opening of the throttle device.

[For production]

In the throttle device of the dehumidifier according to the present invention, the valve opening degree is corrected when the temperature of the gas discharged from the compressor exceeds a predetermined value.

[Embodiments of the invention]

Hereinafter, a dehumidifying device according to an embodiment of the present invention will be explained based on FIG. 1, and in FIG. (The blower (61), psychrometric temperature sensors (7), (8), and control device (9) are the same as the conventional device, so their explanation will be omitted.

(19> is a temperature sensor installed in the discharge pipe of the compressor (1) to detect the temperature of the discharged gas, and the psychrometric temperature sensor (7)
.

Similarly to (2), the output is introduced to the control device (9).

Next, the operation will be explained. First, when the discharge gas temperature of the compressor (1) is within the operating limit of the compressor (1), the valve opening of the throttle device (3) is determined by the psychrometric temperature sensor (7), as in the conventional device. 8) is set to a value corresponding to the detected temperature and is operated. When the discharge gas temperature exceeds the operating limit of the compressor (1), for example 130°C, the temperature sensor (19) detects this and the control device (9)
A signal is sent to In the control device (9), the memory (13
) is sent to the drive device (17), and the valve opening of the throttle device (3) is corrected to maintain operation. Note that if this correction does not lower the discharge gas temperature to within the usable limit, this operation is repeated several times.

〔Effect of the invention〕

As described above, according to the present invention, the temperature of the gas discharged from the compressor is detected, and when the detected value exceeds a predetermined value, the valve opening of the throttle device is corrected. It is possible to obtain a dehumidifying device that can maintain operation even under conditions that exceed the operating limits of the compressor.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a dehumidifier according to an embodiment of the present invention, FIG. 2 is a diagram showing the configuration of a refrigerant circuit of a conventional dehumidifier, and FIG. 3 is a diagram showing the configuration of the main parts of a conventional dehumidifier. Figure 4 is a diagram showing the flI command of the control section of the dehumidifier, Figure 5 is
The figure is a characteristic diagram showing the relationship between the valve opening of the throttling device and the temperature of the dehumidified air flowing into the cooler, and Figure 6 shows the effective voltage applied to the blower and the psychrometric method of the dehumidified air flowing into the cooler. FIG. 3 is a characteristic diagram showing the relationship with temperature difference. In the figure, (1) is the compressor, (2) is the condenser, and (3)
is the expansion device, 0) is the cooler, (51 is the refrigerant circuit, (6)
is a blower, (9) is a control device, and (19) is a temperature sensor. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A refrigerant circuit in which a compressor, a condenser, a throttle device, and a cooler are connected in sequence, and a blower that guides dehumidified air from the cooler to the condenser, the temperature of the dehumidified air flowing into the cooler is adjusted to The dehumidifier is configured to control the valve opening of the throttle device accordingly, wherein the valve opening of the throttle device is corrected when the discharge gas temperature of the compressor exceeds a predetermined value. dehumidifier.