CN112161419B

CN112161419B - Demisting system and control method thereof

Info

Publication number: CN112161419B
Application number: CN202011104334.5A
Authority: CN
Inventors: 黄欢; 何浩宁
Original assignee: Guangdong Hck Refrigeration Technology Co ltd
Current assignee: Guangdong Hck Refrigeration Technology Co ltd
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2022-04-15
Anticipated expiration: 2040-10-15
Also published as: CN112161419A; CN114459182B; CN114459182A

Abstract

The invention relates to the field of demisting, in particular to a demisting system and a control method thereof. The invention provides a demisting system, which is applied to refrigeration equipment with a compressor cabin, and comprises: the detection device, the driving device and the flow dividing device adjust the ventilation area of a first ventilation hole in the compressor bin through a push rod in the driving device, so that the second ventilation hole demists the refrigeration equipment; the invention also provides two control methods of the defogging system, wherein the first control method determines whether to perform defogging by detecting whether to fog, and the second control method adjusts the strategy of the defogging process by detecting the concentration of the fogging so as to finish the defogging.

Description

Demisting system and control method thereof

Technical Field

The invention relates to the field of defogging, in particular to a defogging system and a control method thereof.

Background

The fogging of a refrigerator and a refrigerated display cabinet in daily life is a normal phenomenon, but the fogging can shield partial glass parts of equipment, so that the condition in the equipment cannot be known in real time; the moisture brought by the fog is not beneficial to the normal use of the equipment, and the long-time fog adhesion can accelerate the aging of the equipment or cause corrosion to the surface of the equipment.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art or the related art.

In view of the above, it is an object of the present invention to provide a defogging system.

It is a further object of the present invention to provide two methods of controlling a defogging system.

In order to achieve the above object, a first aspect of the present invention provides a defogging system for a refrigerator or a refrigerated display case, wherein the refrigerator or the refrigerated display case includes a compressor compartment, the defogging system comprising: the detection device is used for sending a demisting signal; the compressor bin is provided with a first vent hole and a second vent hole, and a flow distribution plate and a driving device are arranged in the compressor bin; the first ventilation hole is positioned on a first surface of the compressor bin, the second ventilation hole is positioned on a second surface of the compressor bin, and the second surface is perpendicular to a door body of the refrigerator or the refrigeration display cabinet and extends out; the driving device comprises a receiving module and a push rod, wherein the receiving module is used for: receiving the defogging signal sent by the detection device and driving the push rod; the push rod is used for: pushing the splitter plate; the flow distribution plate is used for: controlling the opening degree of the first vent hole.

Through the defogging system, the detection device realizes the intellectualization of the defogging system, and can automatically detect whether the refrigerator or the refrigeration display cabinet generates fog so as to determine whether to send a defogging signal. After the driving device receives the demisting signal, the shunting device is driven, the opening degree of the first vent hole is changed, air passes through the second vent hole, the second vent hole stretches out due to the fact that the system is perpendicular to the equipment applying the system, the air can accelerate the air circulation speed of the outer surface of the equipment after leaving the compressor bin, demisting is carried out on the outer surface of the equipment, and the equipment is prevented from being in a wet state for a long time. Under the inoperative state of the driving device, the air in the compressor bin only leaves the compressor bin through the first vent hole and does not pass through the second vent hole, thereby avoiding causing burden to the equipment applying the system.

In the technical scheme, the splitter plate is provided with a third vent hole, one side of the splitter plate is provided with an inclined surface, and the splitter plate is attached to the surface where the first vent hole is; the push rod is arranged behind the inclined plane and forms a certain included angle with the inclined plane; the receiving module is used for driving the moving push rod so as to push the inclined plane to execute a demisting process.

In this technical scheme, the third ventilation hole can make the air not blockked by the flow distribution plate, directly leaves the compressor storehouse through first ventilation hole. The push rod can push the inclined plane, so that the receiving module indirectly finishes the control on the position change of the inclined plane to execute a demisting process and finish demisting on the outer surface of equipment applying the system.

In the above technical solution, the defogging process includes: the detection device sends the demisting signal; the receiving module receives the defogging signal sent by the detection device, drives the push rod to move forwards to push the inclined plane, and the inclined plane drives the splitter plate to move in the vertical plane of the movement direction of the push rod.

In this technical scheme, the chain action of receiving module, push rod and flow distribution plate makes the relative position in first ventilation hole and third ventilation hole change, leads to the flow reduction of air through first ventilation hole and third ventilation hole, and the flow of air through the second ventilation hole increases, realizes the defogging to above-mentioned equipment.

In the above technical solution, the detection device includes a camera device and a processing module, the processing module calculates visibility of a picture through the picture acquired by the camera device, and the processing module sends a defogging signal when determining that the visibility is smaller than a first threshold value.

In this technical scheme, detection device can obtain the photo through camera device, can obtain camera device's visibility size from the visibility of photo, when visibility is less than first threshold value, can send defogging signal to drive arrangement, improves defogging system to the detectability of the fog-forming condition of the equipment of applied this system, makes defogging system can independently accomplish the defogging to above-mentioned equipment.

In the technical scheme, one end of the push rod is provided with a chamfer; the inclined plane and the flow distribution plate form a certain included angle; wherein the chamfer angle is equal to the included angle.

In the technical scheme, the chamfer and the inclined plane can avoid the situation that the local position of the inclined plane is damaged due to the fact that the defogging process is executed for multiple times.

According to the invention, the first control method provided by the defogging system comprises the following steps: acquiring color components of a plurality of first points on the photo; calculating the visibility of each first point according to the color component of each first point; and executing the defogging process when the number of the visibility of the first points smaller than the first threshold value is judged to be larger than a second threshold value.

In the technical scheme, the fog-forming condition is evaluated according to the acquired photos, whether a demisting signal is sent or not can be determined according to the fog-forming condition so as to determine whether demisting is carried out or not, the demisting system can be prevented from being in a demisting state for a long time, and unnecessary consumption is reduced.

In the above technical solution, after the step of performing the defogging operation is completed when the number of the points whose visibility is smaller than the first threshold is larger than the second threshold, the method further includes a secondary defogging process, where the secondary defogging process includes: acquiring a second picture at the same position as the first picture; acquiring color components of a plurality of second points in the second picture, wherein the positions of the second points are the same as those of the first points, and calculating the visibility of each second point; and when the number of the second points with the visibility smaller than the first threshold value is judged to be larger than a second threshold value, executing the demisting process, and executing a secondary demisting process again. And stopping executing the defogging process when the number of the visibility of the second points smaller than the first threshold value is judged to be smaller than or equal to a second threshold value.

In the technical scheme, the same photo is obtained after the first control method is executed so as to evaluate the current fogging condition again, so that the defogging effect of the first control method can be known to determine whether to perform the operation of defogging again.

In the above technical solution, when the number of times of performing the secondary defogging process is determined to be greater than the third threshold, and when the secondary defogging process is performed next time, the color components of all the points with the visibility less than the first threshold at the previous time are set to be 0.

In the technical scheme, the position which is still not effective after the defogging process is executed for many times is subjected to zeroing processing, so that the interference caused by other white objects can be avoided, and the consumption caused by misjudgment is reduced.

According to a second control method provided by the present invention, comprising: acquiring a third photo; acquiring color components of a plurality of third points on the picture; calculating the visibility of each third point according to the color component of each third point; and calculating a first average value of first ratios of the visibility of the third points to the visibility under the condition of no fog, and controlling the opening of the first ventilation hole according to the first average value.

In the technical scheme, the strategy of the defogging process is adjusted according to the visibility condition of the selected third point, so that the consumption caused by driving the push rod in the defogging process and the burden on equipment applying the system can be reduced.

In the above technical solution, after the step of calculating the ratio of visibility to visibility without fog is completed and controlling the opening of the first vent according to the ratio, the method further includes a rechecking process, where the rechecking process includes: acquiring a fourth picture at the same position as the third picture; acquiring color components of a plurality of fourth points in the fourth picture, wherein the fourth points correspond to the third points in position, and calculating the visibility of each fourth point; calculating a second ratio of the visibility of the plurality of fourth points to the visibility under the condition of no fog, and calculating a second average value of the second ratio; when the second average value is judged to be larger than the first average value, the opening degree of the first vent hole is reduced, the second average value replaces the first average value, and a rechecking process is executed; and when the second average value is judged to be smaller than or equal to the first average value, setting the opening degree of the first vent hole as the maximum opening degree.

In the technical scheme, the defogging effect of the second control method is evaluated by obtaining the fourth photo at the same position as the third photo, the defogging process is executed again if the defogging process has the defogging effect, and the defogging process is not executed again if the defogging process has no effect, so that the defogging process is prevented from being executed for many times due to other environmental factors.

The invention provides a demisting system, which determines whether demisting is carried out or not according to the judgment of a detection device of the demisting system on the fogging condition, and then controls the opening degree of a first vent hole through the interlocking action of a driving device and a flow dividing device, so that air leaves a compressor bin through a second vent hole to finish demisting; the invention also provides two demisting system control methods, wherein the first control method determines whether to execute a demisting process by detecting whether to fog, and the second control method adjusts the strategy of the demisting process by detecting the concentration of the fog to finish demisting.

Drawings

FIG. 1 illustrates a front view of a refrigerated display case in which the defogging system of one embodiment of the present invention is utilized;

FIG. 2 illustrates a cross-sectional view of a refrigerated display case in which the defogging system of one embodiment of the present invention is utilized;

FIG. 3 shows an enlarged detail at A of a refrigerated display case to which the defogging system of one embodiment of the present invention is applied;

FIG. 4 is a schematic view of a diverter plate of a refrigerated display case with which the defogging system of the present invention is utilized;

FIG. 5 is a schematic illustration of a portion of a compressor compartment of a refrigerated display case in which the defogging system is utilized in accordance with one embodiment of the present invention;

FIG. 6 shows a flow chart of a first control method according to an embodiment of the invention;

FIG. 7 illustrates a flow diagram of a secondary defog process of the first control method according to one embodiment of the present invention;

FIG. 8 shows a flow chart of a second control method according to an embodiment of the invention;

fig. 9 shows a flow chart of a review process of a second control method according to an embodiment of the invention;

FIG. 10 is a front elevational view of a portion of a refrigerated display case with a defogging system applied thereto in accordance with an embodiment of the present invention;

FIG. 11 illustrates a cross-sectional view A-A of a portion of a refrigerated display case with which the defogging system is utilized in accordance with one embodiment of the present invention;

FIG. 12 is an enlarged detail view at C of a portion of a refrigerated display case in which the defogging system is utilized in accordance with one embodiment of the present invention;

FIG. 13 is a front elevational view of a portion of a refrigerated display case with the defogging system applied thereto in accordance with one embodiment of the present invention;

FIG. 14 shows a cross-sectional view at B-B of a portion of a refrigerated display case with which the defogging system is utilized in accordance with one embodiment of the present invention;

FIG. 15 shows an enlarged detail view at D of a portion of a refrigerated display case in which the defogging system is employed in accordance with one embodiment of the present invention;

wherein, the correspondence between the reference numbers and the part names of fig. 1 to 15 is shown in the following table:

reference numerals	Name of component	Reference numerals	Name of component
				1	Compressor bin	401	Chamfering
101	Fan blower	402	Club head
				102	First vent hole	403	Push rod tail
103	Second vent hole	5	Image pickup apparatus
				2	Flow distribution plate	6	Refrigeration showcase
201	Third vent hole	601	Compressor
				203	Inclined plane	602	Condenser
4	Push rod	603	Cabinet door

Detailed Description

In order that the above objects, features and advantages of the present invention may be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings. It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Some embodiments according to the invention are described below with reference to fig. 1 to 9.

A refrigerated display case, as shown in figures 1, 2 and 3, comprises a compressor compartment 1, a compressor 601, a cabinet door 603, a fan 101 and a condenser 602.

The compressor 601 and the condenser 602 implement heat exchange between the inside of the refrigerated display cabinet and the outside, so that a large amount of heat is often generated, and the fan 101 is required to cool the compressor 601 and the condenser 602.

Specifically, as shown in fig. 1 and fig. 2, taking the refrigeration showcase 6 as an example, the fan 101 is kept in an operating state, so as to keep air circulation in the compressor compartment, and perform a heat dissipation function on the 601 condensers 602 of the compressor.

Because refrigerating plant's refrigeration effect leads to the inside and outside difference in temperature of cabinet door great, though can use some thermal-insulated measures in most times, if use double glazing's cabinet door, nevertheless under the great environment of air humidity, the outer surface of cabinet door still often can produce the fog.

As shown in fig. 2, 3, 4 and 5, a defogging system according to the present invention is applied to a refrigeration device such as a refrigerated showcase, including: the detection device is used for sending a demisting signal; the compressor bin 1 is provided with a first vent hole 102 and a second vent hole 103, and the splitter plate 2 and a driving device are arranged in the compressor bin 1; the first vent hole is positioned on the first surface of the compressor bin, the second vent hole is positioned on the second surface of the compressor bin, and the second surface is perpendicular to the door body of the refrigerator or the refrigeration display cabinet and extends out; (ii) a The driving device comprises a receiving module and a push rod 4, wherein the receiving module is used for: receiving a demisting signal sent by the detection device and driving the push rod 4; the push rod 4 is used for: pushing the splitter plate 2; the splitter plate 2 is used for: the opening degree of the first ventilation hole 102 is controlled.

Specifically, detection device is used for detecting cold-stored show cupboard, and when detection device detects out that cold-stored show cupboard takes place the fog phenomenon, send the defogging signal, otherwise then do not send.

Illustratively, as shown in fig. 1 and 2, the detection device includes a camera device 5 and a processing module, the processing module calculates visibility of the picture from the picture obtained by the camera device, and the processing module sends a defogging signal when determining that the visibility is less than a first threshold value.

Specifically, the detection device determines whether or not to transmit the defogging signal based on the generation of the fog by the imaging device 5. As shown in fig. 1 and 2, taking the defogging system applied to the refrigeration display cabinet 6 as an example, taking the cabinet door 603 as a detection object for fogging, the camera device 5 is installed at a position where the cabinet door 603 can be photographed, and a plurality of points selected from the photographed pictures are calibrated, wherein the maximum distance between the plurality of points and the camera device 5 in reality, that is, the distance between the farthest position of the plurality of points and the camera device 5 in a fog-free state is calibrated. If the object has the condition of fogging, the fog can shield the cabinet door, and the processing module shields the cabinet door according to the formula

Obtaining the visibility V of the above points in the picture, wherein I^c(y) is an array formed by values of all color channels of all points in the obtained picture, namely, r, g and b color channels and red, green and blue color channels, and Ω (x) is an area centered on the point x, namely, a plurality of areas centered on the selected point, and an area formed by points adjacent to the point x is generally selected, and min_y∈Ω(x)I^c(y) is I^c(y) minimum of the array of 1 color channel in the array representing Ω (x) region, min_{c∈(r，g，b)}(min_y∈Ω(x)I^c(y)) represents I^c(y) the minimum value of the array representing all color channels of the Ω (x) region in the array, d (x) is the actual distance from the camera device where the farthest detection point is located, and a is the ambient light intensity value. As the refrigerated showcase 6 is generally used indoors and receives the irradiation of a stable light source for a long time, the refrigerated showcase 6 can be considered to be in a stable light environment, namely A is a constant, the first threshold values of all the points are possibly different due to different positions of a plurality of points, a numerical value is selected from 0.9 times to 1 time of d (x) of each point to be used as the first threshold value of the point, when the visibility of the point is smaller than the first threshold value, the cabinet door 603 is determined to be fogged, the defogging operation is required to be carried out, and the detection device is used for detecting whether the illumination of the stable light source is in a receiving mode or notThe block sends a defogging signal. The specific detection object is only an example and is not limited. In short, the judgment of whether the detection object is fogged or not can be completed through the camera device and the processing module so as to decide whether to send the defogging signal or not.

The compressor bin 1 is provided with a first vent hole 102 and a second vent hole 103, and the splitter plate 22 and a driving device are arranged in the compressor bin 1; the first ventilation hole is located on the first surface of the compressor bin, the second ventilation hole is located on the second surface of the compressor bin, and the second surface is perpendicular to the door body of the refrigerator or the refrigeration display cabinet and extends out.

As shown in fig. 2 and 3, the first ventilation hole 102 and the second ventilation hole 103 both function to provide a passage for air to leave the compressor compartment, and the flow dividing plate 2 and the driving device are arranged to control air to leave the compressor compartment from the first ventilation hole 102 or from the second ventilation hole 103, wherein the second surface of the flow dividing plate extends out perpendicular to the door body of the refrigerator or the refrigeration display cabinet, so that the second ventilation hole 103 faces the door body, and since the door body is generally an object needing defogging, the second ventilation hole 103 can blow the air heated by the compressor to the door body needing defogging.

The driving device comprises a receiving module and a push rod 4, wherein the receiving module is used for: receiving a demisting signal sent by the detection device and driving the push rod 4; the push rod 4 is used for: pushing the splitter plate 2; the splitter plate 2 is used for: the opening degree of the first ventilation hole 102 is controlled.

The pushrod 4 comprises a pushrod tail 403 and a rod head 402, wherein the pushrod tail 403 is fixedly connected with the compressor chamber 1, and the rod head faces the splitter plate 2. One state of the push rod 4 is: the rod head 402 is not in contact with the flow distribution plate 2, and the first vent hole 102 and the third vent hole 201 are in an overlapping state, and air completely exits the compressor compartment 1 from the first vent hole 102 and the third vent hole 201.

Another state of the push rod 4 is: the rod head 402 pushes the splitter plate 2 to make the third vent hole 201 move parallel to the plane of the first vent hole 102, the first vent hole 102 is blocked by the splitter plate 2, the air flow leaving the compressor cabin 1 through the first vent hole 102 and the third vent hole 201 is reduced, and the air flow leaving the compressor cabin 1 through the second vent hole 103 is increased. It is worth mentioning that the second ventilation hole 103 is always in a completely opened state no matter what state the push rod 4 is in.

One side of the flow distribution plate 2 is provided with an inclined surface 203, and the flow distribution plate 2 is attached to the surface where the first vent hole 102 is; the push rod 4 is arranged behind the inclined surface 203 and forms a certain included angle with the inclined surface 203; the receiving module is used for driving the push rod 4 to push the inclined plane 203 so as to execute a defogging process, wherein the defogging process comprises the following steps: the detection device sends a demisting signal; the receiving module receives the defogging signal sent by the detection device, drives the push rod 4 to move forward to push the inclined plane 203, and the inclined plane 203 drives the splitter plate 2 to move in the vertical plane of the moving direction of the push rod 4.

It can be understood that the splitter plate 2 is attached to the surface where the first vent hole 102 is located, so that air can normally leave the compressor compartment 1 through the first vent hole 102 and the third vent hole 201; meanwhile, when the opening degree of the first vent hole 102 needs to be reduced, the demisting process can be completed only by the action of the splitter plate 2. Because the push rod 4 forms a certain included angle with the inclined surface 203, when the push rod 4 moves forward, a component force perpendicular to the moving direction of the push rod 4 is generated on the inclined surface 203 through the included angle to execute a defogging process. Through the interlocking action, the opening degree of the first vent hole 102 can be reduced, and the defogging process is completed.

Specifically, one operating state of the defogging system is as follows: as shown in fig. 1 to 3, taking the refrigeration showcase 6 as an example, the cabinet door 603 is used as an object for detecting whether fogging occurs. The cabinet door 603 does not have the fog, and detection device detects that cabinet door 603 does not have the fog, does not send the defogging signal, and the state of push rod 4, flow distribution plate 2, first ventilation hole 102 and third ventilation hole 201 in compressor compartment 1 is as shown in fig. 10 to 12, and the pole head 402 of push rod 4 does not contact with flow distribution plate 2, as shown in fig. 12, and first ventilation hole 102 and third ventilation hole 201 are in the state of overlapping, and the air that fan 101 promoted leaves compressor compartment 1 from first ventilation hole 103 and third ventilation hole 201 completely. Because the pushed air flow rate is high, according to the bernoulli principle, the air at the second vent hole 103 is sucked into the compressor compartment 1 to form an isolation layer, so that the heat generated by the compressor 601 and the condenser 602 is prevented from leaving the compressor compartment 1 through the second vent hole 103 and blowing towards the cabinet door 603.

Specifically, the defogging system operates in the following manner: the cabinet door 603 is fogged, the detecting device determines that the cabinet door 603 is fogged, and sends a defogging signal, the receiving module receives the defogging signal from the detecting device, and then drives the push rod 4, as shown in fig. 13 to 15, the push rod 4 moves forward, contacts with the inclined plane 203, and generates a thrust force on the inclined plane 203, but the splitter plate 2 is disposed in the compressor compartment 1 and behind the first vent hole 102, so the face where the first vent hole 102 is located can limit the splitter plate 2 to move forward, and because the contact part of the inclined plane 203 and the push rod 4 form a certain angle, a force perpendicular to the movement direction of the push rod 4 can be generated on the splitter plate 2, so that the splitter plate 2 starts to move in the perpendicular plane to the movement direction of the push rod 4, and the relative position of the first vent hole 102 and the third vent hole 201 changes, as shown in fig. 12 and 15, the splitter plate 2 moves upward to block the first vent hole 102, and the first vent hole 102 and the third vent hole 201 end up overlapping state, the aperture of first ventilation hole 102 reduces, the air that fan 101 promoted can not leave compressor compartment 1 through first ventilation hole 102 completely, the flow that the air passes through second ventilation hole 103 begins to increase, make the circulation of air near the position that fog appears in cabinet door 603 surface that is close to second ventilation hole 103, fog begins to evaporate, because set up compressor 601 and condenser 602 in compressor compartment 1, compressor 601 and condenser 602 are in operating condition for a long time and produce a large amount of heat, produce the effect of heating to the air in compressor compartment 1, consequently, the air that flows possesses higher temperature, can improve the evaporation effect of fog, realize the defogging. The refrigerated display case is merely exemplary and the particular equipment in which the system is used is not intended to be limiting.

It can be understood that, as shown in fig. 1 and fig. 2, taking the defogging system applied to the refrigerated display cabinet 6 as an example, taking the cabinet door 603 as a detection object for fogging, the detection device can not only detect whether the cabinet door 603 generates fog, but also determine the fog concentration, the related parameter is visibility, visibility at a certain point and the fog concentration are in positive correlation, that is, the lower visibility at a certain point is, the higher fog concentration at the certain point is, or the lower visibility at a plurality of points is, which indicates that the fog concentration generated on the cabinet door 603 is higher. For the cabinet door 603, the higher the density of mist generated, the faster the air circulation rate should be to promote evaporation of the mist, i.e. the faster the air circulation rate should be leaving the compressor compartment via the second ventilation holes 103. By acquiring the visibility of a plurality of points, the calculation method of the visibility is the same as that of the above embodiment, and is not repeated, and then the average value P of the ratio of the visibility of each point to the visibility of each point under the corresponding fog-free condition is calculated, the ventilation area S of the first ventilation hole 102 under the first average value P is calculated according to the formula S ═ P × C, C is the maximum ventilation area of the first ventilation hole 102, when the ventilation area of the first ventilation hole 102 is reduced, the air flow rate of the second ventilation hole 103 is increased, and vice versa, accordingly, the current ventilation area of the first ventilation hole 102 can be adjusted according to the fog concentration, that is, the higher the fog concentration is, the smaller the ventilation area of the first ventilation hole 102 is, and accordingly, the faster the air circulation speed leaving the compressor compartment through the second ventilation hole 103 is, and the higher the defogging intensity is. The change of the ventilation area of the first ventilation hole 102 can be completed through the defogging process in the above embodiment, the lower the corresponding visibility in the defogging process, the stronger the defogging signal intensity, the larger the decrease of the ventilation area of the first ventilation hole 102 caused by the stronger defogging signal intensity, and the ventilation area of the first ventilation hole 102 can be adjusted according to the visibility. The air flow rate of the second vent hole 103 can be controlled by controlling the vent area of the first vent hole 102, thereby improving or reducing the intensity of demisting; different defogging intensity is used through the fog to the concentration of difference, and the burden that subsidiary heat caused cabinet door 603 when having reduced the defogging.

Optionally, a thin wall extending perpendicular to the plane of the second vent hole 103 is provided at the position of the second vent hole 103. Taking the refrigerated showcase 6 as an example, taking the cabinet door 603 as a detection object, since the air is disturbed after being blocked by the flow dividing plate 2, even if the air passes through the second ventilation hole 103, a part of the air may escape from the opening and may not be blown to the outer surface of the cabinet door 603. The thin wall is arranged to guide the flow direction of air passing through the second ventilation hole 103, so that the air can be blown to the cabinet door 603 more intensively to achieve demisting. The specific detection object and the refrigeration display cabinet are only examples and are not limited.

Further, one end of the push rod 4 is provided with a chamfer 401; the inclined surface 203 forms a certain included angle with the splitter plate 2; wherein the chamfer 401 is equal to the included angle.

As shown in fig. 3, specifically, the inclined surface 203 and the flow distribution plate 2 form an included angle which is an acute angle formed by the inclined surface 203 and the flow distribution plate 2, the push rod 4 is provided with a chamfer 401, when the push rod 4 moves forward, and the push rod 4 contacts with the inclined surface 203, the transmission of the thrust is completed through the contact of the inclined surface 203 and the chamfer 401, because the angle formed by the two is equal, and the surface where the tail end of the push rod 4 is located is parallel to the flow distribution plate 2, the chamfer 401 and the inclined surface 203 can be completely attached during the contact, so that the thrust is uniformly distributed on a line formed by the contact of the two. In short, the contact area between the push rod 4 and the inclined surface 203 is large enough to avoid pushing force only on a part of the inclined surface 203, which results in excessive local pushing force and bending of the inclined surface 203.

All the following control methods and the secondary defogging process and the rechecking process of the control methods are exemplified by the refrigerated display cabinet 6 in fig. 1 and 2, and whether the cabinet door 603 is fogged or not is detected.

In another aspect of the present invention, there is provided a first control method for the above defogging system, wherein it is understood that, since the fogging condition is closely connected to the current humidity and temperature, the fogging phenomenon will occur continuously when the ambient humidity and temperature are in a stable and easily fogged state, and the defogging needs to be performed accordingly, a time interval Δ T may be set, and the first control method is started every other time interval Δ T to determine whether to perform the defogging process. The first control method includes the steps of:

a first photograph is acquired.

Specifically, the first picture may be obtained by capturing an image with an image capturing device to complete the obtaining of the first picture.

Color components of a number of first points are acquired on the first photograph.

As shown in fig. 1 and 2, specifically, taking the refrigeration showcase 6 as an example, whether the cabinet door 603 is fogged or not is detected. The first picture is used for selecting n first points as detection objects, wherein n is 1, 2 and 3 … … n, the first points are selected by equally dividing the cabinet door 603 into k parts, wherein k is 1, 2 and 3 … … k, and n/k points are selected as the detection objects in each part.

And calculating the visibility of each first point according to the color component of each first point.

In particular, according to the formula

Obtaining the visibility V of each selected point in the picture, wherein I^c(y) is an array of values of all color channels of all points in the acquired photograph, i.e., r, g, b color channels, red, green, and blue color channels, and Ω (x) is a region centered at the point x, i.e., a region centered at a selected point, and generally a region formed by points adjacent to the selected point, min_y∈Ω(x)I^c(y) is I^c(y) minimum of the array of 1 color channel in the array representing Ω (x) region, min_{c∈(r，g，b)}(min_y∈Ω(x)I^c(y)) represents I^c(y) the minimum value of the array representing all color channels of the Ω (x) region in the array, d (x) is the actual distance from the camera device where the farthest detection point is located, and a is the ambient light intensity value. The specific detection device and apparatus are merely examples and are not limiting.

And executing a defogging process when the visibility of the first points is judged to be smaller than the first threshold value and the number of the first points is judged to be larger than the second threshold value.

Specifically, since the selected object is a point, there may be an accident, so that multiple first points are selected, and the performance of the multiple first points, that is, the number of first threshold values at which the visibility of the first points is smaller than that of the first points, is taken as a reference, if the number of points at which the visibility is smaller than that of the first threshold values is greater than that of the second threshold values, it indicates that the cabinet door 603 has been fogged, and a defogging process needs to be performed, where an execution method of the defogging process is the same as that in the previous embodiment, and is not described again. According to the standard of the fogging number of the first point, whether the demisting operation is needed or not is judged, and the demisting automation of the demisting system can be realized. The detection apparatus and devices are merely examples and are not intended to be limiting.

Optionally, the selection of the point of each part may also be changed according to the fogging rule of the cabinet door 603, and if the fogging position of the cabinet door of the refrigerator is generally the position of the cabinet door close to the ground, the cabinet door may be divided into an upper part and a lower part on average, and the lower part is the position close to the ground, and then the average division is performed, so that the effectiveness of the selected first point is improved. The specific detection object and the division method are only examples and are not limited. In a word, the selected position of the detection point is correspondingly changed through the fogging rule of the cabinet door 603, so that the expression capability of the fogging condition of the selected point to the cabinet door 603 can be improved, and automatic demisting is realized.

Further, as shown in fig. 7, after the step of executing the defogging process is completed when the number of the visibility of the points is judged to be smaller than the first threshold is larger than the second threshold, the method further includes a secondary defogging process, and the defogging process is evaluated to ensure a defogging effect. The secondary demisting process comprises the following steps:

acquiring a second picture at the same position as the first picture; and acquiring color components of a plurality of second points in the second picture, wherein the positions of the second points are the same as those of the first points, and calculating the visibility of each second point.

Specifically, the second picture may be obtained in the same shooting position as the first picture. Since the first picture and the second picture are taken at the same position, the point at each position of the first picture and the second picture can be regarded as the point at the same position at different moments, and the defogging effect of the defogging process can be evaluated by evaluating the visibility change conditions of the points. Visibility at various points is typically calculated to achieve an assessment of defogging effects. The calculation method of the visibility of each point is the same as the above embodiment, and is not described again.

And when the number of the second points with the visibility smaller than the first threshold value is judged to be larger than the second threshold value, sending a demisting signal, and executing a secondary demisting process again.

It can be understood that, repeatedly carrying out the secondary defogging process can carry out defogging many times to the position that the defogging effect is not good, improves the defogging effect of defogging system.

And stopping executing the defogging process when the number of the second points with the visibility smaller than the first threshold value is judged to be smaller than or equal to the second threshold value.

It will be appreciated that if the visibility of a plurality of second points is significantly improved after the defogging process, i.e., there are only a few second points, the number of which is less than or equal to the second threshold value, there are still situations where the visibility is low, and these points can be considered as invalid measurement points, and the influence of these points is ignored, so as to reduce the number of times of the defogging process due to the existence of these points.

Further, when the number of times of executing the secondary defogging process is larger than the third threshold value and the secondary defogging process is executed next time, the color components of all the points with the visibility smaller than the first threshold value at the last time are set to be 0.

It can be understood that whitish things, such as turbid liquid and white powder remaining on the cabinet door 603 can affect the detection method, so that the detection method misjudges that fog exists on the cabinet door 603, and thus the defogging process is performed for multiple times by mistake, which results in failure of the detection method, and the cabinet door 603 is also blown by high-temperature air for a long time, which causes burden to the detection method.

Another aspect of the present invention provides a second control method applied to the above defogging system, as shown in fig. 8, the second control method including the steps of:

acquiring a third photo; acquiring color components of a plurality of third points on the picture; calculating the visibility of each third point according to the color component of each third point; and calculating a first average value of first ratios of the visibility of the plurality of third points to the visibility under the condition of no fog, and controlling the opening of the first ventilation hole according to the first average value.

Specifically, the method for acquiring the third point and the method for calculating the visibility are the same as those of the first point in the above embodiments, and are not described again. After the visibility of the third points is obtained, a first average value a1 of a first ratio of the visibility of each third point to the visibility under the corresponding fog-free condition is calculated, and according to a formula α 1, a1 × α, a ventilation area α 1 of the first vent hole under the first average value a1 is calculated, where α is the maximum ventilation area of the first vent hole, and when the ventilation area of the first vent hole is reduced, the air flow of the second vent hole is increased, and vice versa. The air flow rate of the second vent hole can be controlled by controlling the vent area of the first vent hole, thereby improving or reducing the defogging intensity. Different defogging intensity is used through the fog to the concentration of difference, and the burden that subsidiary heat caused cabinet door 603 when having reduced the defogging.

Further, as shown in fig. 9, after the step of calculating a first average value of the first ratio of visibility to visibility in the absence of fog is completed, and the opening degree of the first vent is controlled according to the first average value, the method further includes a retest process, and the retest process includes the steps of:

acquiring a fourth picture at the same position as the third picture; color components of a plurality of fourth points are obtained in the fourth picture, the fourth points correspond to the third points in position, and the visibility of each fourth point is calculated; calculating a second average value of a second ratio of the visibility of a plurality of fourth points to the visibility in the case of no fog; and judging that the second average value is larger than the first average value, reducing the opening degree of the first vent hole, replacing the first average value with the second average value, and executing a rechecking process.

Specifically, the visibility calculation method of the fourth point in the retest process is the same as that in the above embodiment, and is not described again. It can be understood that the re-inspection process of the cabinet door 603 can evaluate the defogging effect of the previous defogging process. When the second average value is larger than the first average value, the fog concentration at the detection point is reduced, namely, the defogging process has a certain effect, the opening degree of the first vent hole can be reduced again, the air flow at the second vent hole is increased, the defogging capacity of the defogging process is improved, and the detection point can be evaluated again by performing a rechecking process again

And when the second average value is judged to be smaller than or equal to the first average value, setting the opening degree of the first vent hole as the maximum opening degree.

It can be understood that, if the second average value is less than the first average value, it not only shows that the defogging effect of defogging flow not only does not embody, probably leads to the reason that the concentration of the fog on the cabinet door 603 increases even, is unsuitable to carry out the defogging flow again and carries out the defogging this moment, should in time ignore the influence of this point, sets up the aperture in first ventilation hole to maximum aperture, avoids the air to leave the compressor storehouse through the second ventilation hole, causes the burden to the cabinet door.

The invention provides a demisting system, which determines whether demisting is carried out or not according to the judgment of a detection device of the demisting system on the fogging condition, and then controls the opening degree of a first vent hole through the interlocking action of a driving device and a flow dividing device, so that air leaves a compressor bin through a second vent hole to finish demisting; the invention also provides two demisting system control methods, wherein the first control method determines whether to execute a demisting process by detecting whether to fog, so as to finish demisting, and the second control method adjusts the strategy of the demisting process by detecting the concentration of the fogging, so as to finish demisting.

In the present invention, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the terms "plurality" and "a number" mean two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A defogging system for a refrigerator or a refrigerated display case, said refrigerator or said refrigerated display case including a compressor compartment, comprising:

the detection device is used for sending a demisting signal;

the compressor bin is provided with a first vent hole and a second vent hole, and a flow distribution plate and a driving device are arranged in the compressor bin; the first ventilation hole is positioned on a first surface of the compressor bin, the second ventilation hole is positioned on a second surface of the compressor bin, and the second surface is perpendicular to a door body of the refrigerator or the refrigeration display cabinet and extends out;

the driving device comprises a receiving module and a push rod, wherein the receiving module is used for: receiving the defogging signal sent by the detection device and driving the push rod; the push rod is used for: pushing the splitter plate; the flow distribution plate is used for: controlling the opening degree of the first vent hole; the splitter plate is provided with a third vent hole, one side of the splitter plate is provided with an inclined plane, and the splitter plate is attached to the surface where the first vent hole is located; the push rod is arranged behind the inclined plane and forms a certain included angle with the inclined plane; the receiving module is used for driving the push rod so as to push the inclined plane to execute a demisting process;

the receiving module receives the demisting signal sent by the detection device, drives the push rod to move forwards to push the inclined plane, and the inclined plane drives the flow distribution plate to move in a vertical plane of the movement direction of the push rod;

the detection device comprises a camera device and a processing module, the processing module calculates the visibility of a picture through the picture acquired by the camera device, and the processing module sends a defogging signal when judging that the visibility is less than a first threshold value;

the intensity of the defogging signal is inversely related to the visibility; the stronger the defogging signal is, the smaller the ventilation area of the first ventilation hole is.

2. A defogging system as recited in claim 1 wherein one end of said push rod is chamfered; the inclined plane and the splitter plate form an included angle; and the included angle formed by the chamfer and the inclined plane and the flow distribution plate is equal.

3. A first control method applied to the defogging system recited in any one of claims 1-2, comprising:

acquiring a first photo;

acquiring color components of a plurality of first points on the first photo;

calculating the visibility of each first point according to the color component of each first point;

and executing the defogging process when the number of the visibility of the first points smaller than the first threshold value is judged to be larger than a second threshold value.

4. The first control method according to claim 3, wherein after the step of performing the defogging process when the number of the first points whose visibility is lower than the first threshold is greater than the second threshold is completed, the method further comprises a secondary defogging process, wherein the secondary defogging process comprises:

acquiring a second picture at the same position as the first picture;

acquiring color components of a plurality of second points in the second picture, wherein the positions of the second points are the same as those of the first points, and calculating the visibility of each second point;

when the number of the visibility of the second points is smaller than the first threshold value and larger than a second threshold value is judged, executing the defogging process, and executing a secondary defogging process again;

and stopping executing the defogging process when the number of the visibility of the plurality of second points smaller than the first threshold value is judged to be smaller than or equal to a second threshold value.

5. The first control method according to claim 4, wherein when it is determined that the number of times of performing the second defogging process is greater than the third threshold value, the color components of all the points at which the visibility was less than the first threshold value at the previous time are set to 0 at the next time of performing the second defogging process.

6. A second control method applied to the defogging system recited in any one of claims 1 to 2, wherein:

acquiring a third photo;

acquiring color components of a plurality of third points on the picture;

calculating the visibility of each third point according to the color component of each third point;

and calculating a first average value of first ratios of the visibility of the third points to the visibility under the condition of no fog, and controlling the opening of the first ventilation hole according to the first average value.

7. The second control method according to claim 6, wherein after the step of calculating a first average value of the first ratio of visibility to visibility in the absence of fog is completed and controlling the opening degree of the first vent according to the first average value, the method further comprises a retest process, the retest process comprising:

acquiring a fourth picture at the same position as the third picture;

acquiring color components of a plurality of fourth points in the fourth picture, wherein the fourth points correspond to the third points in position, and calculating the visibility of each fourth point;

calculating a second ratio of the visibility of the plurality of fourth points to the visibility under the condition of no fog, and calculating a second average value of the second ratio;

when the second average value is judged to be larger than the first average value, the opening degree of the first vent hole is reduced, the second average value replaces the first average value, and a rechecking process is executed;