JPH04117332U - Anti-icing device for air conditioners - Google Patents

Abstract

(57) [Summary] [Purpose] To solve the condition in which only the area near the refrigerant inlet of the heat exchange section freezes when the refrigerant is not sufficiently filled in the refrigeration circuit of an air conditioner or the flow path resistance increases. The present invention relates to a device for rapid detection. [Structure] In the heat exchange section 4 of an air conditioner equipped with a refrigeration cycle, a gap 4 is formed in the heat exchange fin near the refrigerant inlet.
b is provided, and a freezing detector 5 such as an optical sensor is seen into this gap 4b. For this reason, freezing in the heat exchange section 4 could be detected early and reliably.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is suitable for use in cooling-only air conditioners, coolers, dehumidifiers, evaporators, or heating/cooling devices. The evaporator of the air conditioner used for cooling or the condenser used for heating may be damaged during high humidity and low temperatures. This is to prevent freezing.

0002

[Conventional technology]

A refrigeration circuit that circulates refrigerant compressed by a compressor to a condenser and evaporator is used to cool indoor air. Equipment used for air cooling and heating include air conditioners for air conditioning and air conditioning; There are air coolers and dehumidifiers for cold air. And the part where the refrigerant evaporates during operation of the refrigeration circuit. If the humidity of the air passing through the heat exchanger is high and the temperature is low, frost will form (freeze). ) is known to occur in some cases.

0003 When this type of freezing occurs, heat exchange efficiency becomes extremely poor, so condensation from the compressor is The high-temperature, high-pressure refrigerant headed for the compressor is sent directly to the frozen heat exchange section, or the compressor is operated. It is necessary to perform a defrosting operation such as stopping the The conventional method is to use a sensor to detect abnormally low temperatures in heat exchange parts where frost adheres. is taken.

0004

[Problem that the idea aims to solve]

This type of freezing in the heat exchanger can be easily detected when the temperature of the entire heat exchanger is low. However, for example, if there is not enough refrigerant in the refrigeration circuit, or if there is not enough refrigerant. If the flow path resistance increases due to blockage or deformation of the piping path, the The amount of liquefied refrigerant is reduced, and the refrigerant is immediately absorbed in the heat exchanger near the refrigerant inlet. As it evaporates and becomes low pressure, only this part becomes below 0℃ and freezes, preventing heat exchange. After the middle part, the temperature may be so high that freezing may not occur.

[0005] Therefore, a temperature sensor consisting of a thermistor is installed on the refrigerant pipe exposed on the side of the heat exchanger. In the method of detecting temperature by installing a Nearby pipes must be avoided, and inside heat exchange parts that do not drop below 0°C during the initial operation. It must be installed in the refrigerant piping after the interval. As a result, the amount of refrigerant becomes insufficient. Freezing cannot be detected using conventional structures using temperature sensors attached to the heat exchanger. Therefore, it was not possible to completely solve the problems caused by freezing.

[0006]

[Means to solve the problem]

In order to solve the above problems, in this invention, the compressor 1, evaporator 2, condenser 2a In an air conditioner equipped with a refrigeration cycle, the evaporator 2 connected to the compressor 1 also Or, in the heat exchange fin 4a near the refrigerant inlet part 3 of the heat exchange part 4 consisting of the condenser 2a. A gap 4b is provided, and an icing detector 5 such as an optical sensor is inserted into the gap 4b to control the air conditioning. This is an anti-icing device for Japanese machines.

[0007]

[Effect]

Conditions where the amount of refrigerant filled in the refrigeration circuit is small or the flow path resistance increases. When the operation is started, the refrigerant liquefied in the compressor 1 is immediately transferred to the refrigerant inlet 3 of the heat exchanger 4. Water in the air evaporates and the temperature in the heat exchange section 4 near the refrigerant inlet section 3 drops below 0°C. Minutes form frost and, in severe cases, start to freeze.

[0008] In the present invention, a gap 4b is provided in the heat exchange fin 4a near the refrigerant inlet 3, and this gap 4b is equipped with a freezing detector 5 such as an optical sensor, so that moisture in the air turns into frost. When it adheres to the heat exchange fins 4a and freezes, the ice detector 5 also freezes together. child For example, if the ice detector 5 is composed of an optical sensor, the presence of ice will cause the light to emit light. If the path changes and the light no longer reaches the receiver properly, it detects an abnormality in the amount of light and prevents ice formation. It detects this and sends a signal to start defrosting operation or a signal to detect an abnormality.

[0009]

【Example】

Figure 1 is a sectional view showing an example of a cooling air fan that functions as a dehumidifier, and Figure 2 is a cross-sectional view of the heat exchanger. FIG. 3 is an enlarged front view of the main parts, and FIG. 3 is a side view of the icing detector. 1 is a compressor, and 2a is a compressor. Condenser 2 is the refrigerant that has been liquefied in condenser 2a. is sent to the evaporator. The compressor 1, condenser 2a, and evaporator 2 are connected to a refrigeration circuit. While the refrigerant circulates, heat is radiated in the condenser 2a and heat is absorbed in the evaporator 2. Used for cooling or heating.

0010 4, the refrigerant compressed and liquefied by the compressor 1 is sent through the capillary tube. 3 is the refrigerant inlet of the heat exchange section 4. 4a is a heat exchange fin that constitutes the heat exchange section 4, and 4b is a part of the heat exchange fin 4a. This is a gap created by cutting out a hole.

[0011] 5 is a freezing detector consisting of an optical sensor, etc., which looks into this gap 4a, and detects the liquefied cold. Moisture in the air condenses and forms frost near the refrigerant inlet 3 of the heat exchanger 4 where the medium is sent. , when freezing starts, this gap 4b is also covered with ice, so the ice detector 5 detects the freezing. To detect.

0012 The light emitter and light receiver as shown in the example in Figure 3 are installed side by side so that they look through the transparent body. , an optical sensor that utilizes total reflection of light inside the transparent body is used as the freezing detector 5. When the transparent body placed in the gap 4b is covered with ice, the light cannot be totally reflected and is dissipated. However, since the light does not reach the light receiving section, freezing can be detected.

[0013] Note that a pressure sensor is installed in the gap 4b as the icing detector 5 instead of the optical sensor. If the condensed water turns into ice, its volume increases and compresses the pressure sensor, preventing freezing. It is something that can be detected. In addition, even if a strain sensor is used instead of a pressure sensor, freezing will occur. It is possible to detect changes in pressure as strain.

[0014] 6 is a cold air fan that discharges the cold air cooled by the evaporator 2 into the room, and 7 is a condenser 2a. A heat dissipation fan 8 dissipates the heat of 9 is a drain hose that guides the drain water; 10 is a saucer for collecting drain water; The drain water collected is stored in a drain tank provided below the drain hose 9.

[0015]

[Effect of the idea]

The present invention has the above-mentioned configuration and function, and is capable of ensuring that the refrigeration circuit is fully filled with refrigerant. If the refrigerant inlet is not connected properly, the circuit is clogged or deformed, increasing flow resistance, or the refrigerant inlet When there is little refrigerant flowing from section 3 to heat exchange section 4, when the humidity is high and the temperature is low, the refrigerant Moisture in the air sometimes freezes only in the heat exchange section 4 near the inlet section 3, but this Even in cases of freezing such as This makes it possible to detect it more reliably.

[0016] Therefore, before the heat exchange efficiency of the air conditioner becomes extremely poor, it is recommended to start dehumidifying the air conditioner. It is now possible to move.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of an air conditioner showing an embodiment of the present invention equipped with the device.

FIG. 2 is an enlarged front view of the main part of the heat exchange section of the device of the present invention.

FIG. 3 is a side sectional view showing an embodiment of the icing detector used in the present invention.

[Explanation of symbols]

1 Compressor 2 Evaporator 2a Condenser 3 Refrigerant inlet section 4 Heat exchange section 4a Heat exchange fin 4b void 5 Freezing detector

Claims (1)

[Scope of utility model registration request] Claim 1: In an air conditioner equipped with a refrigeration cycle consisting of a compressor 1, an evaporator 2, and a condenser 2a, the compressor 1
A gap 4b is formed in the heat exchange fin 4a near the refrigerant inlet 3 of the heat exchange section 4, which is composed of the evaporator 2 or condenser 2a connected to the evaporator 2 or condenser 2a.
An anti-icing device for an air conditioner is provided with a icing detector 5 such as an optical sensor in the gap 4b.