Dehumidifier with defrosting detection function

Abstract

The utility model relates to a dehumidifier, in particular to a dehumidifier with a defrosting detection function. The utility model relates to a dehumidifier, and aims to provide a dehumidifier with a defrosting detection function. The dehumidifier has the characteristics of accurate detection and low use cost. According to the technical scheme, the dehumidifier with the defrosting detection function comprises a case, a controller, a compressor, an evaporator, a condenser, a throttling element, a water pan, a water tank, a fan and a defrosting temperature sensor. The compressor, the condenser, the throttling element and the evaporator are sequentially communicated through a pipeline to form a refrigerant circulating flow channel. The air conditioner is characterized in that a frosting sensor is arranged on the evaporator; the controller is electrically connected with the frosting sensor and the defrosting temperature sensor; the frosting sensor comprises a circuit board, a probe and a reflecting plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to a dehumidifier, in particular to a dehumidifier with defrosting detection function. BACKGROUND

[0002] The dehumidifier is also called moisture-removing machine or moisture-removing machine, which is widely used in laboratory, computer room, measurement room, library, archive room, office, material reserve, food and crop warehouse and other places, so as to avoid the moisture and mildew of electronic products, optical instruments, precision equipment and valuable articles.

[0003] As shown in Figure 4 、 Figure 5 , the dehumidifier mainly comprises compressor, heat exchanger, throttling element, water pan, fan, controller and shell, and its working principle is that the fan draws the humid air into the machine, the water in the air is condensed into water droplets by heat exchange and flows into the water pan, the dry air after treatment is discharged outside the machine, and the indoor humidity is reduced by such circulation.

[0004] At present, the dehumidifier generally adopts the working mode of compressor refrigeration, and the evaporator will frost when the system works in low-temperature environment. In order to ensure the normal work of the system, the refrigeration system needs to have the function of timing defrosting (also called automatic defrosting function), that is, the system heats the evaporator to defrost in a fixed time period.

[0005] Due to the difference of temperature and humidity of the working environment of the refrigeration system, the timing defrosting has great blindness. On the one hand, once the timing defrosting time ends, whether the frost on the evaporator is completely defrosted or not, the system will stop defrosting, if the frost is not completely defrosted and continues to refrigerate, the un-defrosted frost will freeze into ice, frost will form on the ice, and the ice and frost will combine to become thicker and thicker, which greatly reduces the efficiency of the refrigeration system, and in the areas with high temperature and humidity, the system cannot work normally. On the other hand, in the areas and seasons with less frost, the defrosting time may be much longer than the need of the system defrosting, which wastes electric energy.

[0006] The key to solve this problem lies in adopting the frost detector to detect the frost condition of the refrigeration system, and the system control part controls the defrosting process according to the detection result of the frost detector, so as to realize the intelligent control of the refrigeration system.

[0007] The frost detector detects the frost process mainly through an indirect method, and there are two types: 1. a micro-pressure sensor detects the air pressure differential of the evaporator inlet, so as to estimate the total amount of frost, since the micro-pressure sensor and the transmitter are relatively high in price, the method can be used only in some small cold storage systems; 2. two thermistors are used, one of which is exposed, and the other is sealed, and the frost is detected by using the measured temperature difference between the two thermistors, but the method requires that the thermistor has a specific installation position, and the detection precision is not high. Practical new type content

[0008] The utility model aims at overcoming the insufficient in the prior art, and provides a dehumidifier with defrosting detection function, which has the characteristics of accurate detection and low use cost.

[0009] The technical scheme of the utility model is:

[0010] A dehumidifier with defrosting detection function, comprising a cabinet, a controller, a compressor, an evaporator, a condenser, a throttling element, a water pan, a water tank, a fan and a defrosting temperature sensor, wherein the compressor, the condenser, the throttling element and the evaporator are connected in sequence by pipelines to form a channel for circulation of refrigerant; characterized in that a frost sensor is arranged on the evaporator; the controller is electrically connected to the frost sensor and the defrosting temperature sensor; and the frost sensor comprises a circuit board, a probe and a reflecting plate.

[0011] The probe comprises an emitter for emitting light to the reflecting plate and a receiver for detecting the reflected light of the reflecting plate.

[0012] The frost sensor is arranged on the leeward side of the evaporator.

[0013] The frost sensor is arranged on the top or bottom of the leeward side of the evaporator.

[0014] The water pan is arranged below the evaporator, and the water pan is connected to the water tank by a drain pipe.

[0015] The evaporator, the condenser and the fan are arranged in sequence between the air inlet and the air outlet of the cabinet.

[0016] A filter screen is further arranged between the air inlet of the cabinet and the evaporator.

[0017] The utility model has the advantages of:

[0018] The utility model discloses a frost sensor is added on evaporimeter, when evaporimeter frost, will make the frost sensor's transmitter, reflector, receiver also synchronously frost, thereby influence the light received by receiver, as the basis of defrosting state, the utility model discloses skillfully utilize optical principle to detect defrosting state, not only simple structure, detection result is accurate, and the reliability is high, and effectively solve the problem of dehumidifier evaporimeter defrosting not clean, further improve the dehumidification performance and energy efficiency of system. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the main view structural schematic drawing of the utility model.

[0020] Figure 2 It is the connection relation schematic drawing of the utility model.

[0021] Figure 3 It is the schematic diagram of the frost sensor of the utility model.

[0022] Figure 4 It is the main view structural schematic drawing of prior art.

[0023] Figure 5 It is the connection relation schematic drawing of prior art.

[0024] Reference Signs:

[0025] Filter screen 1, evaporimeter 2, water pan 3, back air pipe 4, drain pipe 5, water tank 6, compressor 7, exhaust pipe 8, condenser 9, fan 10, frost sensor 11, reflector 11-1, transmitter 11-2, receiver 11-3, support 11-4, throttling element 12. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following is with the embodiment, to the utility model is further detailedly explained.It should be understood that the specific embodiment described here is only for explaining the utility model, and is not for limiting the utility model.

[0027] As Figure 1 Shown, a kind of defrosting detection function of dehumidifier, including cabinet, controller, compressor 7, evaporimeter 2, condenser 9, throttling element 12, water pan 3, water tank 6, fan 10, defrosting temperature sensor.

[0028] The chassis is equipped with an air inlet and an air outlet, with the evaporator, condenser, and fan arranged sequentially between them. A filter screen 1 is also installed between the air inlet and the evaporator. The air inlet side of the fan is in close contact with the condenser, and the air outlet side is in close contact with the air outlet. A water collection tray is located below the evaporator, and the water collection tray is connected to a water tank via a drain pipe 5. The controller is electrically connected to the compressor, the fan, and the defrost temperature sensor (omitted in the figure).

[0029] The compressor, condenser, throttling element, and evaporator are the main components of the dehumidifier refrigeration system. The compressor, condenser, throttling element, and evaporator are connected in sequence through pipelines to form a refrigerant circulation channel: the compressor's exhaust port is connected to the condenser's inlet through exhaust pipe 8, the condenser's outlet is connected to the evaporator's inlet through the throttling element, and the evaporator's outlet is connected to the compressor's suction port through return pipe 4, thus forming a circulation channel.

[0030] The defrosting temperature sensor is used to detect the evaporator temperature. When the set temperature is reached, the evaporator begins to defrost.

[0031] All of the above components can be purchased externally.

[0032] The improvement of this embodiment is that it uses optical principles to detect the frosting condition. Specifically, a frosting sensor 11 is installed on the evaporator to detect the freezing state of water vapor on the evaporator coil.

[0033] The frosting sensor includes a bracket 11-4, which is fixed to the evaporator. The upper part of the bracket is provided with a transmitter 11-2 and a receiver 11-3, and the lower part of the bracket is provided with a reflector 11-1. The bracket is also provided with a circuit board (omitted in the figure). The controller is electrically connected to the circuit board, and the circuit board is electrically connected to the transmitter and the receiver.

[0034] The transmitter sends light (incident light) toward the reflector, which reflects the light onto the reflector. The receiver then detects the reflected light (reflected light). Therefore, the following conditions must be met: the incident light and the reflected light are coplanar with the normal to the reflector; the incident light and the reflected light are on opposite sides of the normal; and the angle of incidence is equal to the angle of reflection.

[0035] The reflector is made of a metal that can reflect light. The reflector is made of the same material as the evaporator coil to ensure that it accurately reflects the frost condition of the evaporator and guarantees accurate test results.

[0036] Due to the leeward side of the evaporator ( Figure 1 The temperature on the left side is lower than that on the windward side. Figure 1 To ensure thorough defrosting, the frost sensor is preferably located on the leeward side of the evaporator (right side).

[0037] In order to ensure complete defrosting, as a preferred embodiment, the frost sensor is arranged at the top or bottom of the leeward side of the evaporator. Figure 1 In the drawings, the frost sensor is arranged at the bottom of the leeward side of the evaporator.

[0038] The utility model discloses a frost sensor is arranged on the evaporator, and the frost sensor is arranged on the lowest temperature position of the evaporator, and the frost sensor can be used for detecting whether the frost exists on the optical window surface of the emitter, the optical window surface of the receiver or the reflection surface of the reflection plate.

[0039] The working principle of the utility model is as follows:

[0040] When the defrosting temperature sensor detects that the coil temperature of the evaporator reaches the trigger condition (lower than the set temperature and the time lower than the set temperature exceeds the set time), the dehumidifier enters the defrosting state, and the evaporator starts heating defrosting, and the frost sensor synchronously detects the defrosting state.

[0041] The utility model discloses a preferable embodiment is given in the drawings. However, the utility model can realize in many different forms, and is not limited to the embodiment described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive.

Claims

1. A dehumidifier with defrost detection function, comprising a casing, a controller, a compressor (7), an evaporator (2), a condenser (9), a throttling element (12), a drip tray (3), a water tank (6), a fan (10), and a defrost temperature sensor; wherein the compressor, condenser, throttling element, and evaporator are sequentially connected by pipelines to form a refrigerant circulation channel; characterized in that: The evaporator is provided with a frost sensor (11); the controller is electrically connected with the frost sensor and the defrosting temperature sensor; the frost sensor comprises a circuit board, a probe and a reflecting plate (11-1).

2. The dehumidifier with defrosting detection function according to claim 1, characterized in that: The probe comprises an emitter (11-2) for emitting light to the reflecting plate and a receiver (11-3) for detecting the reflected light of the reflecting plate.

3. The dehumidifier with defrosting detection function according to claim 2, characterized in that: The frost sensor is arranged at the leeward side of the evaporator.

4. The dehumidifier with defrosting detection function according to claim 3, characterized in that: The frost sensor is arranged at the top or bottom of the leeward side of the evaporator.

5. The dehumidifier with defrosting detection function according to claim 4, characterized in that: The water pan is arranged below the evaporator; the water pan is communicated with the water tank through a drain pipe (5).

6. The dehumidifier with defrosting detection function according to claim 5, characterized in that: The evaporator, the condenser and the fan are sequentially arranged between the air inlet and the air outlet of the cabinet.

7. The dehumidifier with defrosting detection function according to claim 6, characterized in that: A filter screen (1) is further arranged between the air inlet of the cabinet and the evaporator.

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