Evaporator structure and defrosting method thereof, air conditioner, electronic equipment and storage medium

Abstract

The invention discloses an evaporator structure and a defrosting method thereof, an air conditioner, electronic equipment and a storage medium. The control method comprises the following steps that the base part temperature and the end part temperature are obtained in real time through temperature sensors arranged at the base parts and the end parts of fins of the evaporator; the temperature gradient is calculated in real time according to the base temperature and the end temperature; in a sampling period, a defrosting mode is predicted according to the temperature gradient, and the vibration frequency of piezoelectric ceramic vibrators arranged at the center position of a fin at equal intervals in the length direction and / or an electromagnetic vibration exciter at the bottom of the inner side of an evaporator is dynamically adjusted in real time according to the defrosting mode; through a composite vibration mode, a frost layer structure is destroyed from the interface level and the macroscopic level at the same time, and the defrosting efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning defrosting technology, and more particularly to an evaporator structure and its defrosting method, an air conditioner, electronic equipment, and a storage medium. Background Technology

[0002] Evaporator frosting is a common technical challenge in refrigeration, air conditioning, and heat pump systems. Frost buildup on the evaporator fins creates additional thermal resistance, severely reducing heat exchange efficiency, increasing system energy consumption, and even causing system malfunctions. Common defrosting methods include electric defrosting, reverse circulation defrosting, hot gas bypass defrosting, and vibration defrosting. However, these existing technologies generally suffer from simple control strategies, limited vibration modes, and an inability to adaptively adjust to the frosting condition, leading to incomplete defrosting or energy waste.

[0003] A single vibration mode cannot meet the defrosting needs of different frosting stages. Summary of the Invention

[0004] To address the problem that a single vibration mode in existing technologies cannot meet the defrosting requirements of different frosting stages, this invention provides an evaporator structure and its defrosting method, an air conditioner, an electronic device, and a storage medium.

[0005] The present invention adopts the following technical solution: The first aspect of this invention discloses a method for controlling an evaporator structure, comprising the following steps: The base temperature and end temperature are acquired in real time by temperature sensors installed at the base and end of the evaporator fins. The temperature gradient is calculated in real time based on the base temperature and the end temperature. Within a sampling period, the defrosting mode is predicted based on the temperature gradient, and the vibration frequency of the piezoelectric ceramic vibrators and / or the electromagnetic vibrators at the bottom of the inner side of the evaporator are dynamically adjusted in real time based on the defrosting mode, with the fin center positions set at equal intervals along the length direction.

[0006] According to the defrosting method described above, the temperature gradient is calculated using the following formula:

[0007] in, For temperature gradient; This refers to the temperature at the tip of the fin. This refers to the temperature at the base of the fin. This refers to the effective length of the fin.

[0008] According to the defrosting method, the step of predicting the defrosting mode based on the temperature gradient specifically includes: If the temperature gradient is less than the first preset temperature gradient, defrosting will not be initiated. When the temperature gradient is greater than or equal to the first preset temperature gradient and less than the second preset temperature gradient, the electromagnetic vibrator is activated for defrosting. When the temperature gradient is greater than or equal to the second preset temperature gradient and less than the third preset temperature gradient, the piezoelectric ceramic vibrator is activated for defrosting. When the temperature gradient is greater than or equal to the third preset temperature gradient, the electromagnetic vibrator and the piezoelectric ceramic vibrator are activated to defrost together.

[0009] According to the defrosting method, when the temperature gradient is greater than or equal to the first preset temperature gradient and less than the second preset temperature gradient, when the vibration frequency of the electromagnetic vibrator reaches the first natural frequency of the fin, the electromagnetic vibrator maintains this frequency until the sampling period ends.

[0010] Based on the defrosting method described above, the vibration frequency of the piezoelectric ceramic vibrator or electromagnetic vibrator is dynamically adjusted according to the following formula:

[0011] Where F is the vibration frequency of the piezoelectric ceramic vibrator or electromagnetic vibrator; denoted as temperature gradient; C is the proportionality coefficient; k is the nonlinear adjustment factor; and f is the fundamental frequency offset.

[0012] According to the defrosting method, after a sampling period ends, it is determined whether the current temperature gradient is less than the preset end temperature gradient. If so, defrosting is stopped; otherwise, the defrosting mode is predicted based on the temperature gradient.

[0013] The second aspect of the present invention discloses an evaporator structure for performing the above-described defrosting method, comprising: an evaporator body, an electromagnetic vibrator, fins, a temperature sensor, a piezoelectric ceramic vibrator, and a heat exchange tube; Electromagnetic vibrators are provided at equal intervals on the bottom inner side of the evaporator body to excite fin resonance in order to achieve macroscopic defrosting. The evaporator body is provided with a heat exchange tube at the rear, and the heat exchange tube is provided with fins; The fins are provided with reserved holes for heat exchange tubes. A pair of temperature sensors are provided on both the upper and lower sides of the reserved holes for heat exchange tubes. The temperature sensor closer to the reserved holes for heat exchange tubes is used to obtain the base temperature, and the temperature sensor farther away from the reserved holes for heat exchange tubes is used to obtain the end temperature. The piezoelectric ceramic vibrator is arranged at equal intervals along the length direction at the center position of the fin.

[0014] A third aspect of the present invention discloses an air conditioner including the evaporator structure described above.

[0015] A fourth aspect of the present invention discloses an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program, when loaded onto the processor, implements the defrosting method described above.

[0016] A fifth aspect of the present invention discloses a storage medium comprising a stored program, wherein the program, when running, controls the device where the storage medium is located to perform the defrosting method described above.

[0017] Compared with the prior art, the beneficial effects of the present invention include at least the following: This invention improves defrosting efficiency by simultaneously disrupting the frost layer structure at both the interface and macroscopic levels through a composite vibration mode. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a step diagram of the defrosting method for the evaporator structure of the present invention; Figure 2 This is a flowchart of the defrosting method for the evaporator structure of the present invention; Figure 3 The three-dimensional structure of the main components of the evaporator of this invention Figure 1 ; Figure 4 The three-dimensional structure of the main components of the evaporator of this invention Figure 2 ; Figure 5 The three-dimensional structure of the main components of the evaporator of this invention Figure 3 ; Figure 6 This is a diagram of the fin structure of the present invention.

[0020] In the diagram: 1. Evaporator body; 2. Electromagnetic vibrator; 3. Fins; 4. Temperature sensor; 5. Piezoelectric ceramic vibrator; 6. Heat exchange tube. Detailed Implementation

[0021] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0022] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure.

[0023] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0024] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0025] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0027] To address the issues that existing technologies cannot adapt to the defrosting needs of different frosting stages with a single vibration mode, that simple time or temperature threshold control strategies cannot achieve precise defrosting, that have low energy utilization during defrosting and may cause over-defrosting or under-defrosting, that lack the ability to predict the growth trend of frost layers, and that have control response lag.

[0028] like Figure 1 As shown, Embodiment 1 of the present invention provides a defrosting method for an evaporator structure, comprising the following steps: Step S110: The base temperature and end temperature are acquired in real time by using temperature sensors installed at the base and end of the evaporator fins.

[0029] Step S120: Calculate the temperature gradient in real time based on the base temperature and the end temperature.

[0030] Preferably, but not limitingly, the temperature gradient is calculated by the following formula:

[0031] in, This represents the temperature gradient, with units of °C / m. This refers to the temperature at the tip of the fin. This refers to the temperature at the base of the fin. This refers to the effective length of the fin.

[0032] Step S130: Within one sampling period, the defrosting mode is predicted based on the temperature gradient, and the vibration frequency of the piezoelectric ceramic vibrator and / or the electromagnetic vibrator at the bottom of the inner side of the evaporator is dynamically adjusted in real time according to the defrosting mode, with the center position of the fins set at equal intervals along the length direction.

[0033] This invention improves defrosting efficiency by simultaneously disrupting the frost layer structure at both the interface and macroscopic levels through a composite vibration mode.

[0034] Preferably, but not limitingly, the defrosting mode is predicted based on the temperature gradient, specifically including: If the temperature gradient is less than the first preset temperature gradient, defrosting will not be initiated. When the temperature gradient is greater than or equal to the first preset temperature gradient and less than the second preset temperature gradient, the electromagnetic vibrator is activated for defrosting. When the temperature gradient is greater than or equal to the second preset temperature gradient and less than the third preset temperature gradient, the piezoelectric ceramic vibrator is activated for defrosting. When the temperature gradient is greater than or equal to the third preset temperature gradient, the electromagnetic vibrator and the piezoelectric ceramic vibrator are activated to defrost together.

[0035] The model predictive control of this invention enables precise defrosting and avoids unnecessary energy consumption.

[0036] Further preferred but not limiting, when the temperature gradient is greater than or equal to the first preset temperature gradient and less than the second preset temperature gradient, when the vibration frequency of the electromagnetic vibrator reaches the first natural frequency of the fin, the electromagnetic vibrator maintains this frequency until the sampling period ends.

[0037] The present invention enhances system stability, and the adaptive vibration strategy prevents excessive vibration from damaging the fins.

[0038] Preferably, but not limitingly, the vibration frequency of the piezoelectric ceramic vibrator or electromagnetic exciter is dynamically adjusted according to the following formula:

[0039] Where F is the vibration frequency of the piezoelectric ceramic vibrator or electromagnetic vibrator, and its unit is Hz; denoted as temperature gradient, with units of °C / m; C is the proportionality coefficient, ranging from 0.8 to 1.2 when dynamically adjusting the vibration frequency of the piezoelectric ceramic vibrator, and from 1.5 to 2.5 when dynamically adjusting the vibration frequency of the electromagnetic vibrator; k is the nonlinear adjustment factor; and f is the fundamental frequency offset.

[0040] This invention is highly intelligent and has the ability to predict frost growth, realizing the transformation from passive defrosting to active prevention.

[0041] Step S140: After a sampling period ends, determine whether the current temperature gradient is less than the preset end temperature gradient. If yes, stop defrosting; otherwise, continue to predict the defrosting mode based on the temperature gradient.

[0042] This invention has a wide range of applications and is applicable to various types of finned evaporators, demonstrating good versatility.

[0043] like Figure 2 As shown, Embodiment 2 of the present invention provides a preferred embodiment of a defrosting method for an evaporator structure, comprising the following steps: Step S210: The base temperature and end temperature are acquired in real time by using temperature sensors installed at the base and end of the evaporator fins.

[0044] Step S220: Calculate the temperature gradient in real time based on the base temperature and the end temperature.

[0045] Preferably, but not limitingly, the temperature gradient is calculated by the following formula:

[0046] in, This represents the temperature gradient, with units of °C / m. This refers to the temperature at the tip of the fin. This refers to the temperature at the base of the fin. This refers to the effective length of the fin.

[0047] Step S230: Within one sampling period, the defrosting mode is predicted based on the temperature gradient, and the vibration frequency of the piezoelectric ceramic vibrators and / or the electromagnetic vibrators at the bottom of the inner side of the evaporator are dynamically adjusted in real time according to the defrosting mode, with the center position of the fins set at equal intervals along the length direction.

[0048] Preferably, but not limitingly, the defrosting mode is predicted based on the temperature gradient, specifically including: when If the temperature is less than 50°C / m, defrosting will not be activated. When 50°C / m ≤ When the temperature is <150°C / m, the electromagnetic vibrator is activated for defrosting. When 150°C / m ≤ When the temperature is <250°C / m, the piezoelectric ceramic vibrator is activated for defrosting. when When the temperature is ≥ 250°C / m, the electromagnetic vibrator and the piezoelectric ceramic vibrator will be activated together for defrosting.

[0049] Further preferred but not limiting, when the temperature gradient is greater than or equal to the first preset temperature gradient and less than the second preset temperature gradient, when the vibration frequency of the electromagnetic vibrator reaches the first natural frequency of the fin, the electromagnetic vibrator maintains this frequency until the sampling period ends.

[0050] Preferably, but not limitingly, the vibration frequency of the piezoelectric ceramic vibrator or electromagnetic exciter is dynamically adjusted according to the following formula:

[0051] Where F is the vibration frequency of the piezoelectric ceramic vibrator or electromagnetic vibrator, and its unit is Hz; denoted as temperature gradient, with units of °C / m; C is the proportionality coefficient, ranging from 0.8 to 1.2 when dynamically adjusting the vibration frequency of the piezoelectric ceramic vibrator, and from 1.5 to 2.5 when dynamically adjusting the vibration frequency of the electromagnetic vibrator; k is the nonlinear adjustment factor, with a value of 1.5; f is the fundamental frequency offset, with a value of 20Hz.

[0052] Step S240: After one sampling period ends, determine the current temperature gradient. If the temperature is less than 50°C / m, stop defrosting and wait for the next sampling cycle; otherwise, continue to predict the defrosting mode based on the temperature gradient.

[0053] like Figure 3-6 According to the present invention, embodiment 3 provides an evaporator structure, including: an evaporator body 1, an electromagnetic vibrator 2, fins 3, a temperature sensor 4, a piezoelectric ceramic vibrator 5, and a heat exchange tube 6.

[0054] Electromagnetic vibrators 2 are provided at equal intervals on the bottom inner side of the evaporator body 1 to stimulate fin resonance in order to achieve macroscopic defrosting.

[0055] The evaporator body 1 is provided with a heat exchange tube 6 on the rear side, and the heat exchange tube 6 is provided with fins 3.

[0056] The fin 3 is provided with a reserved hole for the heat exchange tube 6. A pair of temperature sensors 4 are provided on both the upper and lower sides of the reserved hole of the heat exchange tube 6. The temperature sensor 4 closer to the reserved hole of the heat exchange tube 6 is used to obtain the base temperature, and the temperature sensor 4 farther away from the reserved hole of the heat exchange tube 6 is used to obtain the end temperature.

[0057] The piezoelectric ceramic vibrators 5 are arranged at equal intervals along the length direction at the center position of the fin 3.

[0058] Embodiment 4 of the present invention provides an air conditioner, including the evaporator structure described above.

[0059] Embodiment 5 of the present invention provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is loaded onto the processor, it implements the defrosting method described above.

[0060] Embodiment 6 of the present invention provides a storage medium, the storage medium including a stored program, wherein the program controls the device where the storage medium is located to perform the above-described defrosting method when it is running.

[0061] Storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Storage media can be, for example, but not limited to, electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples of storage media (a non-exhaustive list) include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. Storage media as used herein is not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0062] The computer-readable program instructions described herein can be downloaded from storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper cables, fiber optic cables, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to storage media within the respective computing / processing device.

[0063] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A control method of an evaporator structure, characterized by, The method comprises the following steps: Real-time acquisition of base temperature and end temperature through temperature sensors arranged at the base and end of the fins of the evaporator; Real-time calculation of temperature gradient according to the base temperature and end temperature; In a sampling period, the defrosting mode is predicted according to the temperature gradient, and the vibration frequency of the piezoelectric ceramic vibrator and / or the electromagnetic exciter at the inner bottom of the evaporator is dynamically adjusted in real time according to the defrosting mode.

2. The defrosting method according to claim 1, wherein: The temperature gradient is calculated by the following formula: wherein, T is the temperature gradient; T is the end temperature of the fin; T is the base temperature of the fin; L is the effective length of the fin.

3. The defrosting method according to claim 1, characterized in that, The defrosting mode is predicted according to the temperature gradient, specifically comprising: When the temperature gradient is less than a first preset temperature gradient, the defrosting is not started; When the temperature gradient is greater than or equal to the first preset temperature gradient and less than a second preset temperature gradient, the electromagnetic exciter is started for defrosting; When the temperature gradient is greater than or equal to the second preset temperature gradient and less than a third preset temperature gradient, the piezoelectric ceramic vibrator is started for defrosting; When the temperature gradient is greater than or equal to the third preset temperature gradient, the electromagnetic exciter and the piezoelectric ceramic vibrator are started for defrosting.

4. The defrosting method according to claim 3, wherein: When the temperature gradient is greater than or equal to the first preset temperature gradient and less than the second preset temperature gradient, when the vibration frequency of the electromagnetic exciter reaches the first-order natural frequency of the fin, the electromagnetic exciter keeps the frequency until the end of the sampling period.

5. The defrosting method according to claim 1, characterized in that, The vibration frequency of the piezoelectric ceramic vibrator or the electromagnetic exciter is dynamically adjusted according to the following formula: wherein F is the vibration frequency of the piezoelectric ceramic vibrator or electromagnetic vibrator; is the temperature gradient; C is the proportional coefficient; k is the non-linear adjustment factor; and f is the fundamental frequency offset.

6. The defrosting method according to claim 1, wherein: After the end of a sampling period, it is judged whether the current temperature gradient is less than a preset end temperature gradient, if yes, the defrosting is stopped, and if not, the defrosting mode is predicted according to the temperature gradient.

7. An evaporator structure for performing the defrosting method according to any one of claims 1 to 6, characterized by comprising: The evaporator body (1), the electromagnetic exciter (2), the fin (3), the temperature sensor (4), the piezoelectric ceramic vibrator (5), and the heat exchange tube (6); The electromagnetic exciter (2) is arranged at the inner bottom of the evaporator body (1) for exciting the resonance of the fin (3) to realize macro defrosting; The heat exchange tube (6) is arranged at the rear side of the evaporator body (1), and the fin (3) is arranged on the heat exchange tube (6); The fin (3) is provided with a reserved hole of the heat exchange tube (6), and a pair of temperature sensors (4) are arranged on the upper and lower sides of the reserved hole of the heat exchange tube (6), the temperature sensor (4) close to the reserved hole of the heat exchange tube (6) is used for acquiring the base temperature, and the temperature sensor (4) away from the reserved hole of the heat exchange tube (6) is used for acquiring the end temperature; The piezoelectric ceramic vibrator (5) is arranged at the center position of the fin (3) along the length direction.

8. An air conditioner characterized by comprising: The evaporator structure of claim 7 is included.

9. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The computer program is loaded into the processor to realize the defrosting method of any one of claims 1-6.

10. A storage medium, comprising a stored program, wherein the program controls the device where the storage medium is located to execute the defrosting method of any one of claims 1-6 when the program is running. ​

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