WO2024016840A1

WO2024016840A1 - Humidity control method for refrigeration device

Info

Publication number: WO2024016840A1
Application number: PCT/CN2023/096981
Authority: WO
Inventors: 王德森; 赵双; 刘新刚; 龙海柳
Original assignee: 青岛海尔特种电冰柜有限公司; 海尔智家股份有限公司
Priority date: 2022-07-22
Filing date: 2023-05-30
Publication date: 2024-01-25
Also published as: CN115355657A

Abstract

A humidity control method for a refrigeration device. The average value CRH of integral humidity values of the first N working periods of a compressor is compared with a preset humidity RH_set of a refrigeration compartment; if the difference between the two is within 5%, adjustment is not performed; and if the difference between the two exceeds 5%, a humidity control adjustment coefficient ΔRH, which is used for controlling the turn-on and turn-off of an evaporation fan, is adjusted, and a turn-on temperature and a turn-off temperature of the compressor are set to be within n°C above and below a preset temperature T of the refrigeration compartment. Therefore, it is ensured that the stability of the temperature in a refrigeration compartment can be maintained during an accurate humidity control process.

Description

Humidity control methods for refrigeration equipment

This application claims the priority of a Chinese patent application with an application date of July 22, 2022, an application number of 202210871659.9, and an invention title of "Humidity Control Method for Refrigeration Equipment", the entire content of which is incorporated into this application by reference.

Technical field

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

Background technique

Although the refrigeration equipment currently on the market advertises that the humidity can be adjusted at the same temperature, this humidity adjustment will make the indoor temperature in the refrigeration room unstable, the temperature fluctuation range will be large, or the adjusted humidity will be significantly different from the preset humidity. , in fact, it is impossible to adjust the humidity to the target humidity while ensuring that the indoor temperature fluctuation in the refrigeration room is small.

Contents of the invention

The object of the present invention is to provide a humidity control method for refrigeration equipment, which sets the starting temperature and shutdown temperature of the compressor according to the preset temperature of the refrigeration compartment, and adjusts and controls the stop of the evaporation fan according to the average value of the integrated humidity value in the refrigeration compartment. The operating control humidity value solves the problem in the existing technology that the humidity control accuracy is small and the temperature fluctuation range is large when adjusting the humidity.

In order to achieve one of the above-mentioned objects of the invention, one embodiment of the present invention provides a humidity control method for refrigeration equipment. The humidity control method includes:

Obtain the compressor start signal, the average value CRH of the integrated humidity value RH of the previous N working cycles of the compressor, and the control humidity adjustment coefficient ΔRH of the previous working cycle of the compressor, where N is an integer greater than zero;

If |CRH-RH _set |≤5%, set ΔRH to remain unchanged relative to the previous working cycle of the compressor; if ∣CRH-RH _set |>5%, set ΔRH to increase or decrease relative to the previous working cycle of the compressor; Among them, RH _set is the preset humidity of the refrigeration room;

Control the compressor and evaporator fan to start in sequence;

Obtain the relative humidity value rh _i in the refrigeration room at a preset time interval, and calculate the dynamic integrated humidity value RH _i in the refrigeration room based on the relative humidity value rh _i ;

Obtain the compressor stop signal and control the compressor to shut down;

When the dynamic integrated humidity value RH _i in the refrigeration room reaches the control humidity value RH _c , the evaporation fan is controlled to stop running; where, the control humidity value RH _c =RH _set -ΔRH;

Wherein, the compressor start signal and the compressor stop signal are specifically: the preset temperature of the refrigeration compartment is T, when the temperature of the refrigeration compartment is T+n°C, it is the compressor start signal; when the temperature of the refrigeration compartment is T When the temperature is T-n℃, it is the compressor shutdown signal, where 0≤n≤3.

As a further improvement of an embodiment of the present invention, when ∣CRH-RH _set ∣>5%, if CRH-RH _set >5%, set ΔRH to increase relative to the previous working cycle of the compressor; if RH _set -CRH>5% , then set ΔRH to decrease relative to the previous working cycle of the compressor.

As a further improvement of an embodiment of the present invention, ΔRH satisfies -5% ≤ ΔRH ≤ 15%, and ΔRH increases or decreases by 5% at a time.

As a further improvement of one embodiment of the present invention, the refrigeration equipment further includes a low temperature compensation system, and the low temperature compensation system includes a heating wire disposed in the air duct;

When ΔRH increases to 15%, if CRH-RH _set >5%, the heating wire is controlled to start.

As a further improvement of one embodiment of the present invention, the electrification rate after the heating wire is started is 70%.

As a further improvement of one embodiment of the present invention, after starting the heating wire, if CRH-RH _set >5%, when the dynamic integrated humidity value RHi in the refrigeration room reaches the integrated humidity inflection point RH inflection point, the evaporation fan is controlled to stop running.

As a further improvement of an embodiment of the present invention, when ΔRH decreases to -5%, the evaporation fan is controlled to continue running.

As a further improvement of an embodiment of the present invention, the duty cycle of the evaporation fan operation is 90%.

As a further improvement of one embodiment of the present invention, the calculation method of the integrated humidity value RH is as follows:

The compressor starts timing and obtains the first relative humidity value and the second relative humidity value at preset time intervals. The humidity values,..., and the last relative humidity value are recorded as rh ₁ , rh ₂ ,..., rh _n in sequence, and the integrated humidity value RH=(rh ₁ +rh ₂ +...+rh _n )/n.

As a further improvement of one embodiment of the present invention, the refrigeration equipment includes a humidity sensor disposed in the refrigeration room. The humidity sensor monitors and obtains the i-th relative humidity value rh _i in the refrigeration room every 10 seconds.

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

The humidity control method of refrigeration equipment provided by the present invention controls the temperature and humidity at the same time during humidity control. According to the preset temperature T in the refrigeration room, the startup temperature T+n°C and the shutdown temperature Tn°C of the compressor are set. During the humidity control process, the startup and shutdown of the compressor are controlled. At the same time, the average value CRH of the integrated humidity value RH of the compressor working cycle is compared with the preset humidity RH _set of the refrigeration equipment, and then the shutdown humidity of the evaporator fan is controlled. The humidity value RH _c is adjusted to control the indoor humidity in the refrigeration room, so that the humidity in the refrigeration room floats within 5% of the preset humidity RH _set , achieving precise humidity control while ensuring that the indoor temperature in the refrigeration room remains stable. Avoid the problem of large indoor temperature fluctuations in the cooling room during humidity control.

Description of drawings

Figure 1 is a flow chart of a humidity control method in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments.

Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

An embodiment of the present invention provides a method for controlling humidity in a refrigeration compartment. As shown in Figure 1, the method for controlling humidity includes:

Obtain the compressor start signal and the average integrated humidity value RH of the compressor in the first N working cycles. value CRH, the control humidity adjustment coefficient ΔRH of the compressor in the previous working cycle, where N is an integer greater than zero;

Control the compressor and evaporator fan to start in sequence;

Obtain the compressor stop signal and control the compressor to shut down;

The embodiment of the present invention is provided with a control humidity value RH _c for controlling the shutdown of the evaporator fan. The control humidity value RH _c is determined by the difference between the preset humidity RH _set of the refrigeration room and the control humidity adjustment coefficient ΔRH.

By calculating the average CRH of the integrated humidity value RH in the first N working cycles of the compressor, the absolute value of the difference between the average CRH and the preset humidity RH _set is compared with 5%, which is the humidity set in the refrigeration room. Maximum error.

If the absolute value of the difference between the average CRH of the integrated humidity value RH of the compressor's first N working cycles and the preset humidity RH _set is not greater than 5%, then the value of the integrated humidity value RH of the compressor's first N working cycles can be known. If the average CRH is within the range of 5% above and below the preset humidity RH _set , and within the allowable range of the humidity error in the refrigeration room, the control humidity adjustment coefficient ΔRH, which sets the control humidity value RH _c for shutting down the evaporator fan, remains unchanged.

When the absolute value of the difference between the average CRH of the integrated humidity value RH in the first N working cycles of the compressor and the preset humidity RH _set is greater than 5%, the control humidity adjustment coefficient ΔRH needs to be adjusted to stop the evaporator fan in advance or Delay shutdown so that the humidity in the refrigeration room reaches the preset humidity RH _set within the next 5% range.

In addition, when controlling humidity in the humidity control method provided by the embodiment of the present invention, the starting temperature of the compressor T+n°C and the stopping temperature of the compressor T-n°C are set according to the preset temperature T of the refrigeration compartment. When the temperature of the refrigeration compartment When it reaches T+n°C, it is the start signal of the aforementioned compressor, which controls the compressor to start; when the temperature of the refrigeration compartment reaches T-n°C, it is the stop signal of the aforementioned compressor, which controls the compressor to shut down.

The starting temperature and stopping temperature of the compressor are set to a range of n°C above and below the preset temperature T, 0≤n≤3, which can avoid the large temperature fluctuation range in the refrigeration room during the humidity control process of the refrigeration equipment, making the refrigeration equipment under control. Humidity while ensuring the stability of the indoor temperature in the refrigeration room.

The humidity control method of refrigeration equipment provided by the embodiment of the present invention can control the indoor humidity of the refrigeration room within the preset humidity RH _set fluctuation range of no more than 5%, and can control the indoor temperature of the refrigeration room at the preset temperature T during the humidity control process. The fluctuation does not exceed the range of n°C, which solves the problems of low humidity control accuracy of existing refrigeration equipment and large indoor temperature fluctuations in the refrigeration room during the humidity control process.

Specifically, in this embodiment, the refrigeration equipment also includes an evaporator and a humidity sensor arranged in the refrigeration room.

Further, the evaporator temperature is -13~-3℃, and the evaporation area of the evaporator is ≥1.3m ² /100L.

The compressor working cycle specifically refers to: the compressor turns on after receiving the compressor start signal, the compressor turns off after receiving the compressor stop signal, and the compressor turns on after receiving the compressor start signal again. Among them, the compressor turns on to the next time it turns on. One compressor working cycle.

During a compressor working cycle, the compressor includes on-state and off-state. When the compressor is on, the evaporator absorbs water vapor in the refrigeration room and condenses it into frost, and the indoor humidity in the refrigeration room decreases.

When the compressor just stops, there is still some liquid refrigerant in the evaporator that absorbs heat and boils and converts into a gaseous state to achieve the cooling effect. That is, after the compressor stops, the evaporator still has a cooling process for a period of time, and this process still reduces the humidity. process, the integrated humidity value when the refrigeration process of this section reaches the lowest value of the relative humidity value is called the integrated humidity inflection point RH _inflection .

When the refrigeration phase of the evaporator ends after the compressor is stopped, if the evaporator fan continues to run, the frost on the evaporator will turn into water vapor and blow to the refrigeration room, and the humidity in the refrigeration room will increase; if the evaporator fan stops running, only The moisture contained in the food in the refrigeration room slightly increases the indoor humidity in the refrigeration room.

Setting the evaporator temperature to the above temperature can ensure the cooling of the refrigeration room, and at the same time prevent the frost on the evaporator from condensing into ice, making it difficult for the evaporator fan to turn the ice on the evaporator into water vapor to provide humidity for the refrigeration room; evaporation The larger evaporation area of the evaporator can increase the area of frost on the evaporator, which is beneficial to the operation of the evaporator fan and increases the humidity of the refrigeration room.

The integral humidity value RH during the working cycle of the aforementioned compressor is specifically as follows: when the compressor starts to start, during the working cycle of the compressor, the humidity sensor obtains a relative humidity value rh _i every 10 seconds, and the first relative humidity value, the The two relative humidity values,..., and the last relative humidity value are recorded as rh ₁ , rh ₂ ,..., rh _n in sequence, and the integrated humidity value RH=(rh ₁ +rh ₂ +...+rh _n )/n.

An integrated humidity value RH is obtained for each working cycle of the compressor. The integrated humidity value of the first working cycle is recorded as R ₁ H, and the integrated humidity value of the second working cycle is recorded as R ₂ H,..., the Nth The integrated humidity value of the working cycle is recorded as R _N H. The average value of the integrated humidity value RH of the previous N working cycles of the compressor is CRH = (R ₁ H + R ₂ H +... + R _N H)/N.

Obtain the relative humidity of the refrigeration compartment at a preset time interval, and calculate the integrated humidity value RH of the relative humidity value obtained within a period. The integrated humidity value RH can better reflect the humidity of the refrigeration compartment during this period. Take N The average CRH of the periodic integrated humidity value RH can better reflect the humidity of the refrigeration room during that period of time. It is more reasonable to compare the average CRH of the integrated humidity value RH with the preset humidity RH _set .

Preferably, N=3. Taking the average CRH of the integrated humidity value RH in the first three working cycles of the compressor can not only obtain the average humidity of the refrigeration room within a certain period of time, but also avoid obtaining the average CRH of the integrated humidity value RH. The time is too long to avoid the influence of the early humidity on the average CRH of the integrated humidity value RH, making the comparison data between the average CRH of the integrated humidity value RH and the preset humidity RH _set inaccurate, and the adjustment of the control humidity adjustment coefficient ΔRH Unreasonable situations occur.

Preferably, ΔRH satisfies -5% ≤ ΔRH ≤ 15%, and ΔRH increases or decreases by 5% at a time.

Controlling the compressor and evaporator fan to turn on in sequence can, on the one hand, avoid the instantaneous current being too large due to the two being turned on at the same time, affecting the circuit; on the other hand, it can reduce the superposition of noise caused by the two being turned on at the same time.

The aforementioned dynamic integrated humidity value RH _i is calculated as follows:

When the compressor starts to start timing, the humidity sensor obtains a relative humidity value rh _i every 10 seconds, and The first relative humidity value, the second relative humidity value,..., and the i-th relative humidity value are recorded as rh ₁ , rh ₂ ,..., rh _i in sequence, and the integrated humidity value RH _i = (rh ₁ + rh ₂ +…+rh _i )/i.

Obtain the relative humidity of the refrigeration room at a preset time interval, and dynamically calculate the dynamic integrated humidity value RH _i of the relative humidity value during the working cycle of the compressor. The dynamic integrated humidity value RH _i can reflect the relative humidity obtained during the working cycle of the compressor. The average value of the current relative humidity value rh _i is more accurate when compared with the dynamic integrated humidity value RH _i and the control humidity value RH _c .

When the absolute value of the difference between the average value CRH of the integrated humidity value RH in the first three working cycles of the compressor and the preset humidity RH _set is not greater than 5%, that is, the average value of the integrated humidity value RH in the first three working cycles of the compressor. The value CRH is within the range of 5% above and below the preset humidity RH _set , and within the allowable range of the humidity error in the refrigeration room. Under this condition, the control humidity value RH _c for stopping the evaporator fan is set and the control humidity adjustment coefficient ΔRH remains unchanged. , to continuously maintain the average value CRH of the integrated humidity value RH of the compressor in the first three working cycles within the allowable humidity error range in the refrigeration room.

When the absolute value of the difference between the average value CRH of the integrated humidity value RH in the first three working cycles of the compressor and the preset humidity RH _set is greater than 5%, that is, the average value of the integrated humidity value RH in the first three working cycles of the compressor. CRH is not within the range of 5% above and below the preset humidity RH _set , and is not within the allowable range of humidity error in the refrigeration room. Under this condition, the control humidity adjustment coefficient ΔRH needs to be adjusted.

Further, after the compressor is stopped, the evaporator fan is judged whether to stop based on the dynamic integrated humidity value RH _i and the control humidity value RH _c . In this embodiment, if _RH > RH _c , the evaporator fan is controlled to stop; otherwise, in During the cooling phase of the evaporator after the compressor is stopped, the evaporator fan is controlled to stop when the dynamic integrated humidity value RH _i reaches the control humidity value RH _c . During the cooling phase of the evaporator after the compressor is stopped, if the evaporator fan continues to be turned on, the humidity in the refrigeration room will continue to decrease; but if the evaporator fan stops running, the moisture in the food in the refrigeration room will cause the indoor humidity in the refrigeration room to rise. high trend.

Therefore, if the difference between the average value CRH of the integrated humidity value RH in the first three working cycles of the compressor and the preset humidity RH _set is greater than 5%, that is, the indoor humidity in the refrigeration room is too high and the humidity needs to be reduced, the humidity adjustment coefficient ΔRH will be controlled. increases, causing the control humidity value RH _c to decrease, that is, delaying the shutdown of the evaporator fan, increasing the running time of the evaporator fan after the compressor is shut down, thereby increasing the cooling time of the cold air circulation in the air duct and the refrigeration room, making the refrigeration room more Too much moisture is adsorbed on the surface of the evaporator and frost forms, causing the indoor humidity in the refrigeration room to Lower more.

Obtain the compressor start signal and compressor stop signal again, and control the compressor to turn on and off. If the difference between the average CRH of the integrated humidity value RH of the compressor in the first three working cycles and the preset humidity RH _set is still greater than 5%, Then continue to control the humidity adjustment coefficient ΔRH to increase.

When the cycle is repeated to control the humidity adjustment coefficient ΔRH to rise to the highest value of 15%, the compressor start signal and compressor stop signal are obtained again to control the compressor to turn on and off. If the integrated humidity value RH of the compressor in the first three working cycles The difference between the average CRH and the preset humidity RH _set is still greater than 5%, then the low temperature compensation system is turned on. The low temperature compensation system includes a heating wire installed in the air duct of the refrigeration equipment, and the energization rate of the heating wire is set to 70%; During the working cycle of the compressor, the humidity adjustment coefficient ΔRH is controlled to maintain a maximum value of 15%.

After the heating wire is turned on, a small amount of heat generated by the heating wire is transferred to the refrigeration chamber through the evaporation fan, which increases the working time of the compressor, thus increasing the refrigeration time and thus the humidity reduction time.

Obtain the compressor start signal and compressor stop signal again, and control the compressor to turn on and off. If the difference between the average CRH of the integrated humidity value RH of the compressor in the first three working cycles and the preset humidity RH _set is still greater than 5%, Then the evaporator fan is controlled to stop running _when the dynamic integrated humidity value RH _i reaches the integrated humidity inflection point RH.

If the difference between the preset humidity RH _set and the average CRH of the integrated humidity value RH of the compressor in the first three working cycles is greater than 5%, that is, the indoor humidity in the refrigeration room is low and the humidity needs to be increased. First, determine the operating status of the heating wire. If the heating wire is on, control the heating wire to turn off. If the heating wire is off, control the humidity adjustment coefficient ΔRH to decrease, so that the control humidity value RH _c increases, that is, the evaporator fan After the compressor is stopped, the running time is reduced, which reduces the cooling time of the cold air circulation in the air duct and the refrigeration room, so that less moisture in the refrigeration room is adsorbed on the evaporator surface to form frost, and the humidity in the refrigeration room decreases less.

Obtain the compressor start signal and compressor stop signal again, and control the compressor to turn on and off. If the difference between the preset humidity RH _set and the average CRH of the integrated humidity value RH of the compressor in the first three working cycles is still greater than 5%, Then continue to reduce the control humidity adjustment coefficient ΔRH.

After repeated cycles until the humidity adjustment coefficient ΔRH is reduced to the minimum value -5%, the compressor start signal and compressor stop signal are obtained again to control the compressor to open and close. If the preset humidity RH _set is the same as the pressure If the difference between the average CRH of the integrated humidity value RH in the first three working cycles of the compressor is still greater than 5%, the evaporator fan is controlled to continue running. Preferably, the duty cycle of the evaporator fan operation is set to 90%.

After the compressor is turned off, if the evaporator fan continues to rotate, the humidity in the refrigeration room will first be reduced by the residual cooling of the evaporator. After the humidity drops to the lowest value, the frost on the evaporator will be blown by the evaporator fan. Water vapor blows into the refrigeration room, increasing the humidity inside the refrigeration room; in addition, the evaporator fan can also suck the air outside the refrigeration equipment into the air duct and blow it to the refrigeration room, using the water vapor in the outside air to increase the humidity in the refrigeration room. Therefore, when the humidity is low, allowing the evaporator fan to continue rotating after the compressor is shut down is beneficial to increasing the indoor humidity in the refrigeration room.

It should be understood that although this specification is described in terms of implementations, not each implementation only contains an independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole and distinguish each individual solution. The technical solutions in the embodiments can also be appropriately 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 of feasible implementations of the present invention. They are not intended to limit the protection scope of the present invention. Any equivalent implementations or implementations that do not deviate from the technical spirit of the present invention are not intended to limit the protection scope of the present invention. All changes should be included in the protection scope of the present invention.

Claims

A humidity control method for refrigeration equipment, characterized in that the humidity control method includes:

Obtain the compressor start signal, the average value CRH of the integrated humidity value RH of the compressor in the previous N working cycles, and the control humidity adjustment coefficient ΔRH of the compressor in the previous working cycle, where N is an integer greater than zero;

If |CRH-RH set |≤5%, set ΔRH to remain unchanged relative to the previous working cycle of the compressor; if ∣CRH-RH set |>5%, set ΔRH to increase or decrease relative to the previous working cycle of the compressor; Among them, RH set is the preset humidity of the refrigeration room;

Control the compressor and evaporator fan to start in sequence;

Obtain the relative humidity value rh i in the refrigeration room at a preset time interval, and calculate the dynamic integrated humidity value RH i in the refrigeration room based on the relative humidity value rh i ;

Obtain the compressor stop signal and control the compressor to shut down;

When the dynamic integrated humidity value RH i in the refrigeration room reaches the control humidity value RH c , the evaporation fan is controlled to stop running; where, the control humidity value RH c =RH set -ΔRH;

Wherein, the compressor start signal and the compressor stop signal are specifically: the preset temperature of the refrigeration compartment is T, when the temperature of the refrigeration compartment is T+n°C, it is the compressor start signal; when the temperature of the refrigeration compartment is T When the temperature is T-n℃, it is the compressor shutdown signal, where 0≤n≤3.
The humidity control method of refrigeration equipment according to claim 1, characterized in that, when ∣CRH-RH set ∣>5%, if CRH-RH set >5%, ΔRH is set to increase relative to the previous working cycle of the compressor; If RH set -CRH>5%, set ΔRH to decrease relative to the previous working cycle of the compressor.
The humidity control method of refrigeration equipment according to claim 2, characterized in that ΔRH satisfies -5% ≤ ΔRH ≤ 15%, and ΔRH increases or decreases by 5% at a time.
The humidity control method of refrigeration equipment according to claim 3, characterized in that the refrigeration equipment further includes a low temperature compensation system, and the low temperature compensation system includes a heating wire disposed in the air duct;

When ΔRH increases to 15%, if CRH-RH set >5%, the heating wire is controlled to start.
The humidity control method of refrigeration equipment according to claim 4, characterized in that the energization rate after the heating wire is started is 70%.
The humidity control method of refrigeration equipment according to claim 5, characterized in that after starting the heating wire, if CRH-RH set >5%, when the dynamic integrated humidity value RH i in the refrigeration room reaches the integrated humidity inflection point RH inflection point , control the evaporator fan to stop running.
The humidity control method of refrigeration equipment according to claim 3, characterized in that when ΔRH decreases to -5%, the evaporation fan is controlled to continue running.
The humidity control method of refrigeration equipment according to claim 7, characterized in that the evaporation fan operates at a duty cycle of 90%.
The humidity control method of refrigeration equipment according to claim 1, characterized in that the calculation method of the integrated humidity value RH is as follows:

The compressor starts to start timing, and the first relative humidity value, the second relative humidity value,..., and the last relative humidity value are obtained at preset time intervals and are recorded as rh 1 , rh 2 ,..., rh n in sequence, and the integral Humidity value RH=(rh 1 +rh 2 +...+rh n )/n.
The humidity control method of refrigeration equipment according to claim 9, characterized in that the refrigeration equipment includes a humidity sensor installed in the refrigeration room, and the humidity sensor monitors the i-th relative humidity in the refrigeration room every 10 seconds. Humidity value rh i .