CN115654787A - Humidity control method of refrigeration equipment - Google Patents

Abstract

The invention provides a humidity control method of refrigeration equipment, the refrigeration equipment comprises an evaporation fan, and a compressor, a condenser, a filter, a capillary tube and an evaporator which are sequentially connected, an electromagnetic valve for controlling the flow direction of a refrigerant is connected between the capillary tube and the filter, the capillary tube comprises a first capillary tube and a second capillary tube which are arranged in parallel, the flow rate of the first capillary tube is greater than that of the second capillary tube, and the humidity control method comprises the following steps: acquiring a value of set humidity RH; if the set humidity RH is more than or equal to 75%, controlling the electromagnetic valve to open a switch on one side of the first capillary tube and close a switch on one side of the second capillary tube; and if the set humidity RH is less than 75%, controlling the electromagnetic valve to open the switch on one side of the second capillary tube and close the switch on one side of the first capillary tube. According to the invention, the flow direction of the refrigerant is controlled according to the set humidity RH by arranging the capillary tube with one large capillary tube and one small capillary tube, so that the humidity control is carried out, the cost is saved, and the humidity control effect is good.

Description

Humidity Control Method for Refrigeration Equipment

technical field

The invention relates to the technical field of refrigeration equipment, in particular to a humidity control method for refrigeration equipment.

Background technique

At present, for the humidity control of the refrigeration room, the frequency conversion compressor is generally used, and the startup and shutdown time of the compressor is changed by changing the operating frequency of the compressor, or the delay time of the evaporator fan and the closing of the damper are used to achieve the purpose of humidity control.

The humidity in the refrigeration room is controlled by the frequency conversion compressor, and the cost of the whole machine is relatively high; when the humidity control in the refrigeration room is realized by the fixed frequency compressor, in order to achieve both humidity and temperature, in high humidity, in order to increase the humidity as much as possible, the compressor will be compressed Between the temperature at the starting point of the machine and the temperature at the stopping point, there are multiple periods of starting up, which will cause the temperature in the box to appear stepped; and for low humidity, the temperature in the box fluctuates greatly.

Therefore, it is necessary to provide a low-cost humidity control method that can take both temperature and humidity into consideration.

Contents of the invention

The purpose of the present invention is to provide a humidity control method for refrigeration equipment. The capillary tube of the refrigeration equipment is divided into the first capillary tube with relatively large flow rate and the second capillary tube with relatively small flow rate. The first capillary tube or the second capillary tube with a smaller flow rate, and then control the humidity in the refrigeration room. The refrigeration equipment only adds a solenoid valve, a tee and a capillary tube. The structure is simple and the humidity control effect is obvious. The problem of high cost or inability to balance temperature and humidity during humidity control.

In order to achieve one of the objectives of the above invention, an embodiment of the present invention provides a humidity control method for a refrigeration device, the refrigeration device includes an evaporating fan and a compressor, a condenser, a filter, a capillary tube, and an evaporator connected in sequence, the A solenoid valve for controlling the flow of refrigerant is connected between the capillary and the filter, the capillary includes a first capillary and a second capillary arranged in parallel, the flow rate of the first capillary is greater than the flow rate of the second capillary, so The humidity control methods include:

Get the value of setting humidity RH;

If the setting humidity RH≥75%, then control the electromagnetic valve to open the switch on the first capillary side, and close the switch on the second capillary side; if the setting humidity RH<75%, then control the electromagnetic valve to open the second capillary Switch on one side, close the switch on the side of the first capillary.

As a further improvement of an embodiment of the present invention, the aforementioned setting humidity RH needs to satisfy: 60%≦RH≦90%.

As a further improvement of an embodiment of the present invention, the set humidity RH adjusts the duty cycle of the evaporator fan with a humidity gradient of 5%, and the duty cycle of the evaporator fan increases with the increase of the set humidity RH.

As a further improvement of an embodiment of the present invention, when the set humidity RH is 75%≤RH≤90%, the duty cycle of the evaporating fan is controlled to increase with the increase of the set humidity RH.

As a further improvement of an embodiment of the present invention,

When the set humidity RH is 75%≤RH<80%, the duty cycle of the evaporating fan is controlled to be 50%;

When the set humidity RH is 80%≤RH<85%, the duty cycle of the evaporating fan is controlled to be 70%;

When the set humidity RH is 85%≤RH<90%, the duty cycle of the evaporation fan is controlled to be 100%.

As a further improvement of an embodiment of the present invention, when the set humidity RH is 60%≤RH<75%, the duty cycle of the evaporating fan is controlled to increase as the set humidity RH increases.

As a further improvement of an embodiment of the present invention,

When the set humidity RH is 70%≤RH<75%, the duty cycle of the evaporating fan is controlled to be 100%;

When the set humidity RH is 65%≤RH<70%, the duty cycle of the evaporating fan is controlled to be 70%;

When the set humidity RH is 60%≤RH<65%, the duty cycle of the evaporation fan is controlled to be 50%.

As a further improvement of an embodiment of the present invention, two evaporators are arranged in parallel, namely a first evaporator and a second evaporator, the first evaporator is connected to the first capillary tube, and the second evaporator An evaporator is connected to the second capillary.

As a further improvement of an embodiment of the present invention, the flow rate of the first capillary is 8 L/min, and the flow rate of the second capillary is 5 L/min.

As a further improvement of an embodiment of the present invention, the evaporator, the first capillary, and the second capillary are connected through a tee.

One or more technical solutions provided by the present invention have at least the following technical effects or advantages:

In the humidity control method of the refrigeration equipment provided by the present invention, in the refrigeration system of the refrigeration equipment, one capillary is replaced with two capillaries with a flow rate of one large and one small, and after the electromagnetic valve is connected to the dry filter, the refrigerant is controlled by the electromagnetic valve. Flow to the first capillary with higher flow or the second capillary with lower flow. When the setting humidity RH is high, the control solenoid valve is connected to the solenoid valve with a large flow rate, and the flow rate of the refrigerant flowing through the capillary tube per unit time is large, absorbing more heat in the cooling room, and quickly dissipating the water vapor in the cooling room in the evaporator When the set humidity RH is small, the control solenoid valve is connected to the solenoid valve with a small flow rate, the flow rate of the refrigerant flowing through the capillary per unit time is small, the heat absorbed by the refrigeration room is less, and the working time of the compressor becomes shorter. Longer, that is, the cooling time increases, which increases the time for the water vapor in the refrigeration room to condense into water droplets on the evaporator. In a compressor working cycle, the more water droplets are adsorbed on the evaporator. The improved structure of the refrigerating equipment in the present invention is simple, and the humidity control effect of the improved refrigerating equipment is obvious.

Description of drawings

Fig. 1 is a schematic structural diagram of a refrigeration device in an embodiment of the present invention.

Fig. 2 is a schematic diagram of the refrigeration system of the refrigeration equipment in the embodiment of the present invention.

Fig. 3 is a flowchart of a method for controlling humidity of a refrigeration device in an embodiment of the present invention.

1. Compressor; 2. Condenser; 3. Filter; 4. Solenoid valve; 51. First capillary; 52. Second capillary; 6. Evaporator; 7. Tee.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

As used herein, for example, the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", The terms "inner", "outer", etc. referring to spatial relative positions are used for convenience of description to describe the relationship of one element or feature relative to another element or feature as shown in the figures. The terms of spatial relative position may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures.

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

And, it should be understood that although the terms first, second, etc. may be used herein to describe various elements or structures, these described objects should not be limited by these terms. These terms are only used to distinguish these described objects from one another. For example, a first capillary may be referred to as a second capillary, and similarly, a second capillary may also be referred to as a first capillary without departing from the scope of protection of the present application.

Embodiment 1 of the present invention provides a humidity control method for refrigeration equipment. As shown in FIG. And evaporator 6, in addition, be connected with electromagnetic valve 4 between capillary tube and filter 3, capillary tube comprises the first capillary tube 51 and the second capillary tube 52 that are arranged in parallel, the flow rate of first capillary tube 51 is greater than the flow rate of second capillary tube 52, refrigeration The refrigerant in the system flows in the direction of the arrow in FIG. 1 , and the solenoid valve 4 can control the refrigerant in the refrigeration system to flow to the first capillary tube 51 with a larger flow rate or the first capillary tube 51 with a smaller flow rate. In this embodiment, the first capillary 51, the second capillary 52, and the evaporator 6 are connected through a tee 7, that is, after the refrigerant flows through the first capillary 51 or the second capillary 52, it flows to the evaporator through the tee 7 6.

The humidity control method of refrigeration equipment is based on the above structure, including:

Get the value of setting humidity RH;

If the setting humidity RH≥75%, then control the solenoid valve 4 to open the switch on the first capillary 51 side, and close the switch on the second capillary 52 side; if the setting humidity RH＜75%, then control the solenoid valve 4 The switch on the side of the second capillary 52 is turned on, and the switch on the side of the first capillary 51 is turned off.

When the refrigerant in the refrigeration system flows through the solenoid valve 4 to the first capillary tube 51 with a relatively large flow rate, since the first capillary tube 51 has a relatively large flow rate, the cooling capacity generated per unit time is relatively large, which can absorb more air in the refrigeration room. Heat; under the same temperature difference, the required cooling time is shorter, which shortens the time for the water vapor in the cooling room to circulate in the cooling room and the air duct, thereby reducing the water vapor in the cooling room flowing through the evaporator6 The time in which the water vapor in the refrigerating room is less attached to the low-temperature evaporator 6 , and the humidity in the refrigerating room decreases less during the start-up time of the compressor 1 . After the compressor 1 stops, driven by the evaporating fan, a small amount of water droplets or frost on the evaporator 6 evaporates again into water vapor and blows it to the refrigeration compartment. Therefore, when the refrigerant in the refrigeration system flows through the first capillary tube 51, it is suitable for High humidity (setting humidity RH≥75%) conditions.

When the refrigerant in the refrigeration system flows through the solenoid valve 4 to the second capillary tube 52 with a smaller flow rate, because the flow rate of the second capillary tube 52 is smaller, the cooling capacity generated per unit time is less, and the heat absorbed in the refrigeration room is less ; Under the same temperature difference, the required cooling time is longer, which increases the time for the water vapor in the cooling room to circulate in the cooling room and the air duct, thereby increasing the water vapor in the cooling room flowing through the evaporator 6. Time, so that a large amount of water vapor in the refrigerating room adheres to the low-temperature evaporator 6 and condenses into water droplets or frost. During the start-up time of the compressor 1, the humidity in the refrigerating room decreases greatly. When the compressor 1 is shut down, the wind from the evaporating fan cannot completely blow the condensed water droplets or frost evaporation on the evaporator 6 to the cooling room, so that the humidity cannot be fully recovered. Therefore, the refrigerant in the cooling system flows through the second capillary tube 52 It is suitable for low humidity (setting humidity RH<75%) conditions.

The setting humidity of the humidity control method of the present invention is between 60% and 90%, and is divided into a high humidity interval and a low humidity interval with 75% as a boundary. However, if only the refrigerant in the refrigeration system is controlled to flow to the first capillary tube 51 or the second capillary tube 52, after the flow direction of the refrigerant is determined, within one working cycle of the compressor 1, since the flow rate of the refrigerant is determined, the refrigeration room The indoor humidity change is also determined. After multiple compressor 1 working cycles, the indoor humidity in the refrigeration room tends to be stable, while the difference between the maximum humidity and the minimum humidity in the high-humidity area and low-humidity area is 15%, and the range of humidity difference is relatively large. , The humidity in the refrigeration room has a large error with the set temperature RH.

In order to solve the above problems, this embodiment adjusts the duty cycle of the evaporating fan, and gradually increases the duty cycle of the evaporating fan as the set humidity RH increases.

When the compressor 1 is turned on, the refrigeration equipment is refrigerated, and the humidity in the refrigeration room drops; when the compressor 1 is turned off, the greater the duty ratio of the evaporating fan, the longer the working time of the evaporating fan is within the working cycle of the evaporating fan. That is, the longer the cold air circulation time in the refrigerating room, because the wind speed can promote evaporation, the frost on the fins of the evaporator 6 is more likely to sublimate into water vapor and re-enter the refrigerating room with the cold air under the cold air flow for a longer period of time, so that Increase the humidity value in the refrigerated compartment.

On the contrary, when the duty ratio of the evaporator fan is smaller, the working time of the evaporator fan is shorter during the working cycle of the evaporator fan, that is, the time for the cold air in the refrigeration room to circulate is shorter, that is, it flows through the fins of the evaporator 6 The shorter the time, the more difficult it is for the frost on the evaporator 6 to sublimate into water vapor and re-enter the refrigeration room with the cold air, and the humidity value of the refrigeration room will increase less.

Further, the humidity RH is set to 5% as a humidity gradient, and the duty cycle of the evaporation fan is adjusted.

Specifically, when the set humidity RH belongs to high humidity conditions (75%≤set humidity RH≤90%), the duty cycle of the evaporating fan corresponding to each humidity gradient is set as follows:

When the set humidity RH is 75%≤RH<80%, the duty cycle of the evaporating fan is controlled to be 50%;

When the set humidity RH is 80%≤RH<85%, the duty cycle of the evaporating fan is controlled to be 70%;

When the set humidity RH is 85%≤RH≤90%, the duty cycle of the evaporating fan is controlled to be 100%.

When the set humidity RH belongs to low humidity conditions (60%≤set humidity RH<75%), the duty cycle of the evaporating fan corresponding to each humidity gradient is set as follows:

When the set humidity RH is 70%≤RH<75%, the duty cycle of the evaporating fan is controlled to be 100%;

When the set humidity RH is 65%≤RH<70%, the duty cycle of the evaporating fan is controlled to be 70%;

When the set humidity RH is 60%≤RH<65%, the duty cycle of the evaporation fan is controlled to be 50%.

After the control solenoid valve 4 is determined to flow to the first capillary 51 with larger flow rate or the second capillary tube 52 with smaller flow rate according to the set humidity RH, then adjust the duty ratio of the evaporator fan according to the aforementioned range of set humidity RH. When the flow rate of the capillary tube and the duty cycle of the evaporating fan are determined, the difference between the maximum and minimum humidity in the refrigeration room is basically fixed within one working cycle of the compressor 1. After multiple working cycles of the compressor 1 , the humidity in the refrigerated compartment changes within a substantially stable temperature range. The duty ratio of the evaporating fan is determined according to the interval where the humidity RH is set, so that the humidity in the cooling room fluctuates around the setting humidity RH. The humidity control method provided by the present invention controls the humidity in the cooling room more accurately.

Further, the flow rate of the first capillary 51 is 8 L/min, and the flow rate of the second capillary 52 is 5 L/min. Two evaporators 6 can be arranged in parallel, namely a first evaporator and a second evaporator. The first evaporator is connected to the first capillary 51, and the second evaporator is connected to the second capillary 52. In this embodiment, only one evaporator is used. An evaporator is an example.

It should be understood that although this description is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the description is only for clarity, and those skilled in the art should take the description as a whole, and each The technical solutions in the embodiments can also be properly combined to form other embodiments that can be understood by those skilled in the art.

The series of detailed descriptions listed above are only specific descriptions for feasible implementations of the present invention, and they are not intended to limit the protection scope of the present invention. Any equivalent implementation or implementation that does not depart from the technical spirit of the present invention All changes should be included within the protection scope of the present invention.

Claims (10)

1. A method for controlling humidity of a refrigerating device, said refrigerating device comprising an evaporating fan and a compressor, a condenser, a filter, a capillary and an evaporator connected in sequence, characterized in that, between the capillary and the filter A solenoid valve is connected to control the flow direction of the refrigerant, the capillary includes a first capillary and a second capillary arranged in parallel, the flow rate of the first capillary is greater than the flow rate of the second capillary, and the humidity control method includes: Get the value of setting humidity RH; If the setting humidity RH≥75%, then control the electromagnetic valve to open the switch on the first capillary side, and close the switch on the second capillary side; if the setting humidity RH<75%, then control the electromagnetic valve to open the second capillary Switch on one side, close the switch on the side of the first capillary. 2 . The humidity control method for refrigeration equipment according to claim 1 , wherein the set humidity RH needs to satisfy: 60%≦RH≦90%. 3. The humidity control method of refrigeration equipment according to claim 2, characterized in that the duty cycle of the evaporator fan is adjusted with a humidity gradient of 5% by setting the humidity RH, and the duty cycle of the evaporator fan is adjusted with the setting It increases with the increase of humidity RH. 4. The humidity control method for refrigeration equipment according to claim 2, characterized in that, when the set humidity RH is 75%≤RH≤90%, the duty ratio of the evaporating fan is controlled to increase with the increase of the set humidity RH. big. 5. The humidity control method of refrigeration equipment according to claim 4, characterized in that, When the set humidity RH is 75%≤RH<80%, the duty cycle of the evaporating fan is controlled to be 50%; When the set humidity RH is 80%≤RH<85%, the duty cycle of the evaporating fan is controlled to be 70%; When the set humidity RH is 85%≤RH≤90%, the duty cycle of the evaporating fan is controlled to be 100%. 6. The humidity control method for refrigeration equipment according to claim 2, characterized in that, when the set humidity RH is 60%≤RH<75%, the duty ratio of the evaporating fan is controlled to increase with the increase of the set humidity RH. big. 7. The humidity control method of refrigeration equipment according to claim 6, characterized in that, When the set humidity RH is 70%≤RH<75%, the duty cycle of the evaporating fan is controlled to be 100%; When the set humidity RH is 65%≤RH<70%, the duty cycle of the evaporating fan is controlled to be 70%; When the set humidity RH is 60%≤RH<65%, the duty cycle of the evaporation fan is controlled to be 50%. 8. The humidity control method for refrigeration equipment according to claim 1, wherein two evaporators are arranged in parallel, namely a first evaporator and a second evaporator, and the first evaporator is connected to The first capillary and the second evaporator are connected to the second capillary. 9 . The humidity control method for refrigeration equipment according to claim 1 , wherein the flow rate of the first capillary is 8 L/min, and the flow rate of the second capillary is 5 L/min. 10 . The humidity control method for refrigeration equipment according to claim 1 , wherein the evaporator, the first capillary tube, and the second capillary tube are connected through a three-way connection. 11 .

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