Defrosting method, defrosting mechanism and heat exchange device

Abstract

This invention provides a defrosting method, defrosting mechanism, and heat exchange equipment for a heat exchange device. The defrosting method includes: acquiring the indoor ambient temperature and a defrosting signal; determining whether the indoor ambient temperature has continuously decreased within a first preset time period; and when the indoor ambient temperature has continuously decreased within the first preset time period and a defrosting signal is acquired, the heat exchange device executes the defrosting process. This invention solves the problem of poor indoor comfort during defrosting in existing air conditioning systems.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, and more specifically, to a defrosting method, defrosting mechanism, and heat exchange equipment for heat exchange equipment. Background Technology

[0002] Currently, in terms of defrosting, existing air conditioners, especially photovoltaic (PV) air conditioners, generally have long defrosting times. Since heating cannot be performed during defrosting, the extended defrosting time significantly impacts normal heating performance, reducing indoor comfort during this process. Furthermore, existing air conditioners typically have poor defrosting performance under harsh conditions. Additionally, for PV air conditioners, the unique characteristics of photovoltaic energy are not being utilized effectively, resulting in inefficient use of this energy. Summary of the Invention

[0003] The main objective of this invention is to provide a defrosting method, defrosting mechanism, and heat exchange equipment to solve the problem of poor indoor comfort during defrosting of air conditioning heating in the prior art.

[0004] To achieve the above objectives, according to one aspect of the present invention, a defrosting method for a heat exchange device is provided, comprising: acquiring an indoor ambient temperature and a defrosting signal; determining whether the indoor ambient temperature continuously decreases within a first preset time period; and when the indoor ambient temperature continuously decreases within the first preset time period and a defrosting signal is acquired, the heat exchange device performs a defrosting process.

[0005] Furthermore, the defrosting method for the heat exchange equipment also includes: during the defrosting process, acquiring the outdoor ambient temperature and the execution time of the defrosting process; determining whether the execution time of the defrosting process has reached a second preset time; when the execution time of the defrosting process has reached the second preset time, acquiring the intermediate temperature of the condenser; determining whether the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within a third preset time; and stopping the defrosting process of the heat exchange equipment when the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within the third preset time.

[0006] Furthermore, the defrosting method for the heat exchange equipment also includes: after acquiring the outdoor ambient temperature, determining whether the acquired outdoor ambient temperature is greater than 0 degrees; when the acquired outdoor ambient temperature is greater than 0 degrees, acquiring the evaporator temperature; determining whether the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within a third preset time period, while simultaneously determining whether the evaporator temperature continuously rises within a fourth preset time period; when the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within the third preset time period, and the evaporator temperature continuously rises within the fourth preset time period, the heat exchange equipment stops the defrosting process.

[0007] Furthermore, the fourth preset duration is set to 30-50 seconds.

[0008] Furthermore, the defrosting curtain of the heat exchange equipment includes multiple independently heated areas, and the defrosting method of the heat exchange equipment also includes: after obtaining the outdoor ambient temperature and before obtaining the intermediate temperature of the condenser, determining whether the obtained outdoor ambient temperature is greater than 0 degrees; when the obtained outdoor ambient temperature is greater than 0 degrees and the execution time of the defrosting process reaches a second preset time, controlling at least one area to stop heating, while keeping at least another area continuing to be heated.

[0009] Furthermore, all areas include an upper area located above and a lower area located below. The defrosting method for the heat exchange equipment also includes: when controlling at least one area to stop heating and at least another area to continue heating, controlling the upper area to stop heating and keeping the lower area to continue heating.

[0010] Furthermore, the first preset temperature is set to 4-18 degrees Celsius, the second preset time is set to 40-60 seconds, and the third preset duration is set to 40-60 seconds.

[0011] Furthermore, the first preset duration is set to 30-60 seconds.

[0012] Furthermore, the defrosting method for heat exchange equipment also includes a preheating process before the defrosting process. The preheating process includes: acquiring the outdoor ambient temperature; determining whether the acquired outdoor ambient temperature is greater than 0 degrees Celsius; when the acquired outdoor ambient temperature is less than or equal to 0 degrees Celsius, controlling the heat exchange equipment to perform the preheating process; when the acquired outdoor ambient temperature is greater than 0 degrees Celsius, acquiring the temperature of the defrosting curtain of the heat exchange equipment; determining whether the acquired defrosting curtain temperature is less than or equal to 0 degrees Celsius; when the acquired defrosting curtain temperature is less than or equal to 0 degrees Celsius, controlling the heat exchange equipment to perform the preheating process.

[0013] Furthermore, the preheating process also includes: acquiring the temperature of the defrosting curtain; determining whether the temperature of the defrosting curtain is continuously greater than or equal to the third preset temperature within a fifth preset time period; when the acquired temperature of the defrosting curtain is continuously greater than or equal to the third preset temperature within a fifth preset time period, stopping the preheating process and executing the defrosting process.

[0014] Furthermore, the fifth preset duration is set to 30-60 seconds, and the third preset temperature is set to 20-40 degrees Celsius.

[0015] Furthermore, the defrosting process includes: stopping the external fan of the heat exchange equipment; driving the defrosting curtain of the heat exchange equipment to descend; and starting the defrosting curtain to heat and defrost the condenser.

[0016] Furthermore, the defrosting process also includes: acquiring the outdoor ambient temperature before the outdoor fan of the heat exchange equipment stops; determining whether the outdoor ambient temperature is greater than 0 degrees; keeping the four-way valve of the heat exchange equipment from switching when the acquired outdoor ambient temperature is greater than 0 degrees; driving the four-way valve of the heat exchange equipment to switch when the acquired outdoor ambient temperature is less than or equal to 0 degrees, and controlling the outdoor fan to rotate at a predetermined speed when the defrosting curtain is driven to descend.

[0017] Furthermore, the defrosting method for heat exchange equipment also includes: acquiring the power of the internal power supply mechanism before the defrosting curtain is activated; determining whether the power is greater than 0; when the acquired power is greater than 0, the defrosting curtain acquires the power of the internal power supply mechanism to activate; when the acquired power is less than or equal to 0, the defrosting curtain acquires the power from outside the heat exchange equipment to activate.

[0018] Furthermore, the defrosting method for the heat exchange equipment also includes: before performing the defrosting process, acquiring a set temperature; determining whether the indoor ambient temperature is greater than or equal to the difference between the set temperature and the fourth preset temperature; when the acquired indoor ambient temperature is greater than or equal to the difference between the set temperature and the fourth preset temperature, the heat exchange equipment is in a first parameter state; otherwise, the heat exchange equipment is in a second parameter state; wherein, the first preset duration in the first parameter state is greater than the first preset duration in the second parameter state, the second preset time in the first parameter state is less than the second preset time in the second parameter state, the third preset duration in the first parameter state is less than the third preset duration in the second parameter state, and the first preset temperature in the first parameter state is less than the first preset temperature in the second parameter state.

[0019] Furthermore, the fourth preset temperature is set to 2-5 degrees Celsius.

[0020] According to another aspect of the present invention, a defrosting mechanism is provided for performing the above-described defrosting method for a heat exchanger. The defrosting mechanism includes: a defrosting curtain located on the side of the condenser, the defrosting curtain having a defrosting state that blocks the side of the condenser and a retracted state that avoids the side of the condenser, the defrosting curtain having a heating element for defrosting the condenser; and a plurality of temperature sensors disposed on the outdoor unit, indoor unit, condenser, evaporator, and defrosting curtain, and used to detect the outdoor ambient temperature, indoor ambient temperature, condenser intermediate temperature, evaporator temperature, and defrosting curtain temperature.

[0021] Furthermore, the defrosting curtain includes an upper region and a lower region, each with an independently operating heating element, and the temperature detection element on the defrosting curtain is located in the lower region.

[0022] Furthermore, the temperature sensing element is located at the bottom of the lower area.

[0023] Furthermore, the defrosting mechanism also includes: a drive component; a rotating shaft, the rotating shaft being drivenly connected to the drive component, the top end of the defrosting curtain being connected to the rotating shaft, the rotating shaft being rotatably configured and capable of rolling up the defrosting curtain so that the defrosting curtain rises away from the side of the condenser.

[0024] According to another aspect of the present invention, a heat exchange device is provided, including an internal power supply mechanism and the aforementioned defrosting mechanism, wherein the internal power supply mechanism is electrically connected to the defrosting mechanism and supplies power to the defrosting mechanism.

[0025] By applying the technical solution of this invention, the defrosting method of the heat exchange equipment is optimized. Specifically, the start time of the defrosting process is optimized. The heat exchange equipment only starts defrosting when the indoor ambient temperature continuously decreases within a first preset time and a defrosting signal determined based on the external pipe temperature is obtained. In this way, the start time of the defrosting process is optimized. Compared with the traditional method, the start time of the defrosting process in this embodiment is later, which helps to shorten the defrosting time, thereby shortening the heating time that is stopped due to defrosting and improving the indoor comfort during heating and defrosting. Attached Figure Description

[0026] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0027] Figure 1 A flowchart of the defrosting method for the heat exchanger of the present invention is shown;

[0028] Figure 2 It shows Figure 1 Examples of specific processes for defrosting heat exchange equipment in China;

[0029] Figure 3 A schematic diagram of the defrosting mechanism of the present invention applied to a heat exchange device is shown;

[0030] Figure 4 It shows Figure 3 Side view;

[0031] Figure 5 It shows Figure 3 A schematic diagram of the defrosting mechanism in its retracted state;

[0032] Figure 6 It shows Figure 3 A schematic diagram of the defrosting mechanism in the defrosting state.

[0033] The above figures include the following reference numerals:

[0034] 10. Defrosting curtain; 11. Upper area; 12. Lower area; 20. Temperature detection component; 30. Drive component; 40. Rotating shaft; 50. Bushing. Detailed Implementation

[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0036] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0037] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0038] To address the problem of poor indoor comfort during defrosting in existing air conditioning systems, this invention provides a defrosting method, defrosting mechanism, and heat exchange equipment.

[0039] like Figure 1 A defrosting method for a heat exchange device is shown, comprising: acquiring an indoor ambient temperature and a defrosting signal; determining whether the indoor ambient temperature continuously decreases within a first preset time period; and when the indoor ambient temperature continuously decreases within the first preset time period and a defrosting signal is acquired, the heat exchange device performs a defrosting process.

[0040] This embodiment optimizes the defrosting method of the heat exchange equipment. Specifically, it optimizes the start time of the defrosting process. The heat exchange equipment only starts defrosting when the indoor ambient temperature continuously decreases within a first preset time and a defrosting signal determined based on the external pipe temperature is obtained. This optimization of the start time of the defrosting process, compared to the traditional method, results in a later start time, which helps to shorten the defrosting time and thus shorten the heating time interrupted due to defrosting, thereby improving indoor comfort during heating and defrosting.

[0041] To facilitate the explanation of parameter relationships, let's define the outdoor ambient temperature as TW, the indoor ambient temperature as TN, the condenser intermediate temperature as TL, the evaporator temperature as TZ, the defrost curtain temperature as TJ, and the remote control setting temperature as TS. Taking the indoor ambient temperature as an example, TN1, TN2...TNx represent the indoor ambient temperature TN1 at the beginning of a certain time, the indoor ambient temperature TN2 at the second beginning of ...

[0042] In this embodiment, the defrosting method for the heat exchange equipment further includes: acquiring the outdoor ambient temperature and the execution time of the defrosting process during the defrosting process; determining whether the execution time of the defrosting process has reached a second preset time; acquiring the intermediate temperature of the condenser when the execution time of the defrosting process has reached the second preset time; determining whether the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within a third preset time, that is, continuously TL≥TW+T1 within the third preset time, where T1 is the first preset temperature; and stopping the defrosting process of the heat exchange equipment when the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within the third preset time. The above method determines the stopping time of the defrosting process. It uses parameters such as the execution time of the defrosting process and the intermediate temperature of the condenser to determine whether defrosting needs to be completed and can be stopped. This shortens the defrosting time while ensuring the defrosting effect, avoiding any impact on heating comfort. It also prevents insufficient defrosting leading to poor defrosting results and the need for frequent defrosting cycles. Combined with the aforementioned optimized design of the defrosting start time, the overall defrosting time is more reasonable, achieving both better defrosting results and shorter defrosting time, thus ensuring indoor comfort.

[0043] In this embodiment, the defrosting method for the heat exchange equipment further includes: after acquiring the outdoor ambient temperature, determining whether the acquired outdoor ambient temperature is greater than 0 degrees Celsius; when the acquired outdoor ambient temperature is greater than 0 degrees Celsius, acquiring the evaporator temperature; determining whether the intermediate condenser temperature is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within a third preset time period, and simultaneously determining whether the evaporator temperature continuously increases within a fourth preset time period; when the intermediate condenser temperature is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within the third preset time period, and the evaporator temperature continuously increases within the fourth preset time period, the defrosting process of the heat exchange equipment is stopped. If any of the above determination conditions other than the outdoor ambient temperature are not met, the defrosting process continues. The above method adds conditions for stopping the defrosting process. This is mainly because if the evaporator temperature remains low when the outdoor ambient temperature is above 0 degrees Celsius, the defrosting process is not fully complete and needs to continue. Therefore, when the outdoor ambient temperature is above 0 degrees Celsius, both the condenser intermediate temperature and the evaporator temperature need to be checked. Only when both parameters meet the requirements can the defrosting process be considered complete, and it can be stopped to resume normal heating. This ensures a complete and efficient defrosting process and avoids frequent defrosting cycles.

[0044] It should be noted that the execution order of the two steps—obtaining the evaporator temperature and determining whether the defrosting process has reached the second preset time—is not unique; they can be executed sequentially or simultaneously. Similarly, the order of other steps that do not have a causal relationship is also not unique.

[0045] In this embodiment, the defrosting curtain 10 of the heat exchanger includes multiple independently heated areas. The defrosting method of the heat exchanger further includes: after obtaining the outdoor ambient temperature and before obtaining the intermediate temperature of the condenser, determining whether the obtained outdoor ambient temperature is greater than 0 degrees; when the obtained outdoor ambient temperature is greater than 0 degrees and the execution time of the defrosting process reaches a second preset time, controlling at least one area to stop heating, and keeping at least another area to continue heating, otherwise keeping all areas heated.

[0046] Specifically, during defrosting of the condenser, water droplets generated in the upper region 11 after heating flow downwards down the condenser to the lower part. Since these water droplets are still relatively cold, defrosting in the lower region of the condenser is slower. Based on this, the defrosting curtain 10 in this embodiment includes an upper region 11 and a lower region 12. The heating of the upper region 11 and the lower region 12 of the defrosting curtain 10 is controlled separately. That is, the defrosting method for the heat exchanger further includes: when at least one region stops heating and at least another region remains heated, the upper region 11 stops heating while the lower region 12 continues to heat. In this way, the heating time of the lower region 12 is longer than that of the upper region 11, allowing the upper region 11 to stop heating earlier, avoiding unnecessary energy waste, while the continued heating of the lower region 12 ensures effective defrosting. Of course, the partitioning of the defrosting curtain 10 is not limited to the upper region 11 and the lower region 12 in this embodiment. The number of partitions can be increased as needed, and the heating time can also be adjusted accordingly.

[0047] Preferably, the first preset temperature is set to 4-18 degrees Celsius, the first preset duration is set to 30-60 seconds, the second preset time is set to 40-60 seconds, the third preset duration is set to 40-60 seconds, and the fourth preset duration is set to 30-50 seconds. It should be noted that the preset temperature, preset time, and preset duration in this embodiment can be adjusted according to different situations. Different parameters can be selected to execute the defrosting method depending on factors such as indoor temperature and outdoor temperature.

[0048] In this embodiment, the defrosting method for the heat exchange equipment also includes a preheating process before the defrosting process. The preheating process includes: acquiring the outdoor ambient temperature; determining whether the acquired outdoor ambient temperature is greater than 0 degrees Celsius; when the acquired outdoor ambient temperature is less than or equal to 0 degrees Celsius, controlling the heat exchange equipment to perform the preheating process; when the acquired outdoor ambient temperature is greater than 0 degrees Celsius, acquiring the temperature of the defrosting curtain 10 of the heat exchange equipment; determining whether the acquired temperature of the defrosting curtain 10 is less than or equal to 0 degrees Celsius; when the acquired temperature of the defrosting curtain 10 is less than or equal to 0 degrees Celsius, controlling the heat exchange equipment to perform the preheating process; otherwise, no preheating process is performed. The main purpose of the preheating process is to avoid the defrosting curtain 10 being too cold, which could cause damage during its lifting and lowering movements in the defrosting process, thereby improving the defrosting effect of the air conditioner under harsh conditions. Simultaneously, preheating can be performed when the defrosting curtain 10 is in operation or before the condenser is officially heated, thus reducing or eliminating the time required to heat the condenser and shortening the overall defrosting time. For the reasons mentioned above, this embodiment acquires the temperature of the defrosting curtain 10. Since the temperature of the defrosting curtain 10 is mainly affected by the outdoor ambient temperature, in order to improve efficiency, the outdoor ambient temperature is first determined. When the outdoor ambient temperature is less than or equal to 0 degrees Celsius, the defrosting curtain 10 must be preheated. When the outdoor ambient temperature is greater than 0 degrees Celsius, the temperature of the defrosting curtain 10 is then acquired and determined. If the temperature of the defrosting curtain 10 is still less than or equal to 0 degrees Celsius, defrosting is still required; otherwise, it can be considered that the temperature of the defrosting curtain 10 is greater than 0 degrees Celsius, and it can operate and heat normally without preheating. In this way, the preheating process only occurs when needed, thereby avoiding energy waste.

[0049] In this embodiment, the preheating process further includes: acquiring the temperature of the defrosting curtain 10; determining whether the temperature of the defrosting curtain 10 is continuously greater than or equal to a third preset temperature within a fifth preset time period; and stopping the preheating process and executing the defrosting process when the acquired temperature of the defrosting curtain 10 is continuously greater than or equal to the third preset temperature within the fifth preset time period. The above method determines the preheating status of the defrosting curtain 10. When the temperature of the defrosting curtain 10 is continuously greater than or equal to the third preset temperature within the fifth preset time period, it indicates that the defrosting curtain 10 has reached the predetermined temperature and the defrosting process can proceed. Otherwise, it indicates that the preheating process has not reached the predetermined temperature and preheating needs to continue. This ensures that the preheating result meets the heating requirements and achieves the desired heating effect.

[0050] Preferably, the fifth preset duration is set to 30-60 seconds, and the third preset temperature is set to 20-40 degrees Celsius. Similar to the aforementioned parameters, these parameters can also be adjusted according to different situations, and different parameters can be selected to execute the defrosting method depending on factors such as indoor temperature and outdoor temperature.

[0051] In this embodiment, the defrosting process includes: stopping the external fan of the heat exchange equipment; driving the defrosting curtain 10 of the heat exchange equipment to descend, and starting the defrosting curtain 10 to heat and defrost the condenser. The reason for stopping the external fan is to avoid the external fan affecting the defrosting curtain 10 and to ensure the smooth progress of the defrosting process.

[0052] In this embodiment, the defrosting process further includes: acquiring the outdoor ambient temperature before the outdoor fan of the heat exchange equipment stops; determining whether the outdoor ambient temperature is greater than 0 degrees Celsius; if the acquired outdoor ambient temperature is greater than 0 degrees Celsius, keeping the four-way valve of the heat exchange equipment from switching; if the acquired outdoor ambient temperature is less than or equal to 0 degrees Celsius, driving the four-way valve of the heat exchange equipment to switch, and controlling the outdoor fan to rotate at a predetermined speed lower than the normal speed when driving the defrost curtain 10 to descend. The four-way valve can play the role of switching defrosting, while the outdoor fan can prevent the defrost curtain 10 from being sucked onto the condenser and unable to descend. In this way, by controlling the four-way valve and the outdoor fan in conjunction with the outdoor ambient temperature, the operation of the defrost curtain 10 can be matched with the outdoor environment, avoiding the defrost curtain 10 being affected by the outdoor environment and ensuring the smooth progress of the defrosting process. When the defrosting process is completed, the outdoor fan needs to be stopped first, and the defrost curtain 10 is only retracted after the temperature of the defrost curtain 10 has dropped, and then the heating is started normally. In this embodiment, the predetermined speed is set to 100-200 revolutions per minute.

[0053] In this embodiment, since the heat exchange device is an air conditioner, more specifically a photovoltaic air conditioner, and the photovoltaic air conditioner itself has a photovoltaic power source as its internal power supply mechanism, the defrosting method of the heat exchange device further includes: before the defrost curtain 10 operates, acquiring the power of the internal power supply mechanism; determining whether the power is greater than 0; when the acquired power is greater than 0, the defrost curtain 10 acquires power from the internal power supply mechanism to operate; when the acquired power is less than or equal to 0, the defrost curtain 10 acquires power from outside the heat exchange device to operate. In this way, the operation of the defrost curtain 10 is preferentially powered by the photovoltaic power source, thereby prioritizing the use of photovoltaic energy and achieving rational utilization of photovoltaic energy. Only when the photovoltaic power source is depleted will it be powered by external AC mains power.

[0054] In this embodiment, the defrosting method for the heat exchanger further includes: acquiring a set temperature before executing the defrosting process; determining whether the indoor ambient temperature is greater than or equal to the difference between the set temperature and a fourth preset temperature, i.e., TN≥TS-T4, where T4 is the fourth preset temperature; when the acquired indoor ambient temperature is greater than or equal to the difference between the set temperature and the fourth preset temperature, the heat exchanger is in a first parameter state; otherwise, the heat exchanger is in a second parameter state; wherein, the first preset duration in the first parameter state is greater than the first preset duration in the second parameter state, the second preset time in the first parameter state is less than the second preset time in the second parameter state, the third preset duration in the first parameter state is less than the third preset duration in the second parameter state, and the first preset temperature in the first parameter state is less than the first preset temperature in the second parameter state. In this way, in addition to linking the defrosting process with the indoor ambient temperature, it is also linked with the set temperature, thereby enabling the parameter settings to better match the user's desired set temperature and ensuring indoor comfort.

[0055] Preferably, the fourth preset temperature is set to 2-5 degrees Celsius. This parameter is the same as the aforementioned parameters and can also be adjusted accordingly, which will not be elaborated here.

[0056] like Figures 3 to 6 As shown, this embodiment also provides a defrosting mechanism for performing the aforementioned defrosting method for heat exchange equipment. The defrosting mechanism includes a defrosting curtain 10 located on the side of the condenser and multiple temperature sensors 20. The defrosting curtain 10 has a heating element inside, which heats up when energized, thereby defrosting the condenser. The defrosting curtain 10 has a defrosting state that blocks the side of the condenser and a retracted state that avoids the side of the condenser. In this embodiment, the defrosting curtain 10 is height-adjustable. When it is in the defrosting state, the defrosting curtain 10 is lowered to the side of the condenser, thereby achieving the function of heating and defrosting. When it is in the retracted state, the defrosting curtain 10 is raised and stored, thus not affecting the normal operation of the condenser. The temperature sensors 20 can be made of temperature sensors or other components as needed. The temperature sensors 20 are installed on the outdoor unit, indoor unit, condenser, evaporator, and defrosting curtain 10, and are used to detect the outdoor ambient temperature, indoor ambient temperature, condenser intermediate temperature, evaporator temperature, and defrosting curtain temperature, thereby providing the necessary parameters for the aforementioned defrosting method for heat exchange equipment. In this embodiment, the temperature detection element 20 on the defrosting curtain 10 is a temperature sensor, but other components can also be used.

[0057] In this embodiment, as mentioned above, the defrost curtain 10 is arranged in a partitioned manner, specifically including an upper region 11 and a lower region 12. The upper region 11 and the lower region 12 each have independently operating heating elements. That is, the heating states of the upper region 11 and the lower region 12 can be controlled independently. Thus, when only the lower region 12 needs heating, the upper region 11 can be stopped independently. Simultaneously, considering that the temperature of the lower region 12 of the defrost curtain 10 is lower than that of the upper region 11 due to the influence of the condenser, the temperature sensor 20 on the defrost curtain 10 is located in the lower region 12. In this way, the overall temperature of the defrost curtain 10 can be reflected through the lower region 12. As long as the lower region 12 reaches a predetermined temperature, the overall temperature of the defrost curtain 10 will not fall below that predetermined temperature.

[0058] Preferably, the temperature detection element 20 is located at the bottom of the lower region 12, so that the lowest temperature of the defrosting curtain can be detected, ensuring the overall temperature of the defrosting curtain 10 and ensuring the defrosting effect.

[0059] In this embodiment, the defrosting curtain 10 is raised and lowered in a manner similar to a roller, forming a roller shutter structure. Specifically, the defrosting mechanism also includes a drive component 30 and a rotating shaft 40. The drive component 30 can be a stepper motor or similar component. One end of the rotating shaft 40 is driven and connected to the drive component 30, and the top end of the defrosting curtain 10 is connected to the rotating shaft 40 and wrapped around the outside of the rotating shaft 40. Thus, when the rotating shaft 40 rotates under the drive of the drive component 30, the rotation of the rotating shaft 40 can roll up the defrosting curtain 10 to raise it away from the side of the condenser. When it is necessary to lower the defrosting curtain 10, the drive component 30 simply rotates in the opposite direction. In this way, the defrosting curtain 10 occupies a small overall space. In addition, the defrosting mechanism in this embodiment also includes a bushing 50, which can be located at the end of the rotating shaft 40 away from the drive component 30, thereby realizing the installation and fixation of the rotating shaft 40.

[0060] The defrost curtain 10 in this embodiment includes a two-layer structure: an outer encapsulation layer and a heating element. When the defrost curtain 10 is in the defrosting state, the heating element faces the condenser to ensure the defrosting effect. To extend its lifespan, the outermost layer of the outer encapsulation layer, which is furthest from the heating element, is made of waterproof, high-temperature resistant, and corrosion-resistant materials.

[0061] This embodiment also provides a heat exchange device, including an internal power supply mechanism and the aforementioned defrosting mechanism. In this embodiment, the heat exchange device is a photovoltaic air conditioner; therefore, the internal power supply mechanism is a photovoltaic power source. The internal power supply mechanism is electrically connected to the drive component 30 of the defrosting mechanism, thereby providing power to the defrosting mechanism. This allows the defrosting curtain 10 to be raised and lowered using the power from the internal power supply mechanism, achieving the rational utilization of photovoltaic energy. Of course, the defrosting mechanism can not only use the power from the internal power supply mechanism but is also connected to the AC mains power supply that powers the photovoltaic air conditioner, allowing it to continue operating even when photovoltaic energy is insufficient.

[0062] like Figure 2 As shown, the specific process of the defrosting method for the heat exchanger in this embodiment is illustrated below (the acquisition of parameters such as temperature and time has been omitted):

[0063] If TW > 0℃

[0064] When TN≥TS-3℃, and TNx-TNx continuously for 60s -1 If the temperature is ≤0 and a defrosting signal is received, and if TJ≥0 at this time, preheating is not performed. Otherwise, the defrosting curtain 10 preheats the upper region 11 and the lower region 12 until TJ≥+20℃ for 30 seconds. Then, the four-way valve does not switch, the external motor stops, and the stepper motor drives the defrosting curtain 10 to pull down. The lower region 12 is heated until the temperature sensing bulb temperature is 60℃, and the upper region 11 is heated synchronously. After 40 seconds, the upper region 11 is closed, and TL is detected. If the internal TL≥TW+4℃ for 40 seconds, then for the next 40 seconds, TZx-TZx is detected. -1 If the value is ≥0, defrosting is discontinued, defrosting curtain 10 is fully retracted, and the outdoor fan resumes operation at its original speed. Defrosting is complete. Defrosting curtain 10 prioritizes using photovoltaic energy for power supply; if the photovoltaic system has no power output, it uses AC mains power.

[0065] When TN < TS - 3℃, and TNx - TNx continuously for 30 seconds -1 If the temperature is ≤0 and a defrosting signal is received, and if TJ≥0 at this time, preheating is not performed. Otherwise, the defrosting curtain 10 first preheats the upper region 11 and the lower region 12 until TJ≥+20℃ for 30 seconds. Then, the four-way valve does not switch, the external motor stops, and the stepper motor drives the defrosting curtain 10 to pull down. The lower region 12 is heated to the temperature of the temperature sensor bulb at 60℃. After 60 seconds, the upper region 11 is closed, and TL is detected. If TL≥TW+6℃ for 60 seconds, then for the next 40 seconds, TZx-TZx is detected. -1 If the value is ≥0, defrosting is discontinued, defrosting curtain 10 is fully retracted, and the outdoor fan resumes operation at its original speed. Defrosting is complete. Defrosting curtain 10 prioritizes using photovoltaic energy for power supply; if the photovoltaic system has no power output, it uses AC mains power.

[0066] If TW≤0℃

[0067] When TN≥TS-3℃, and TNx-TNx continuously for 60s -1 When the temperature is ≤0 and a defrosting signal is received, the defrosting curtain 10 first preheats the upper area 11 and the lower area 12 until TJ ≥ +30℃ for 60 seconds. Then, the four-way valve reverses, the external motor stops, and the stepper motor pulls the defrosting curtain 10 down. The external motor starts at 150 rpm, and the lower area 12 heats up to the temperature sensing bulb temperature of 60℃. The upper area 11 heats up simultaneously. After 60 seconds, TL is detected. If TL ≥ TW +12℃ for 60 seconds, defrosting is stopped, the external fan stops, the defrosting curtain 10 is completely retracted, and the external fan resumes operation at its original speed. Defrosting is complete. The defrosting curtain 10 prioritizes using photovoltaic energy for defrosting. If the photovoltaic system has no power output, it uses AC mains power.

[0068] When TN < TS - 3℃, and TNx - TNx continuously for 30 seconds -1 When the temperature is ≤0 and a defrost signal is received, the defrost curtain 10 first preheats the upper area 11 and the lower area 12 until TJ ≥ +40℃ for 60 seconds. Then, the four-way valve reverses, the external motor stops, and the stepper motor pulls the defrost curtain 10 down. The external motor starts at 150 rpm, and the lower area 12 heats up to the temperature sensing bulb temperature of 70℃. The upper area 11 heats up simultaneously. After 80 seconds, TL is detected. If TL ≥ TW +18℃ for 60 seconds, defrosting is stopped, the external fan stops, the defrost curtain 10 is completely retracted, and the external fan resumes operation at its original speed. Defrosting is complete. The defrost curtain 10 prioritizes using photovoltaic energy for defrosting. If the photovoltaic system has no power output, it uses AC mains power.

[0069] It should be noted that "multiple" in the above embodiments refers to at least two.

[0070] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0071] 1. This technology solves the problem of poor indoor comfort during defrosting in existing air conditioning systems.

[0072] 2. Optimizing the start time of the defrosting process helps to shorten the defrosting time, thereby shortening the heating time that is interrupted due to defrosting and improving indoor comfort during heating and defrosting.

[0073] 3. Optimize the end time of the defrosting process to shorten the defrosting time while ensuring the defrosting effect and avoiding any impact on heating comfort during the defrosting process;

[0074] 4. Avoid situations where insufficient defrosting leads to poor defrosting results and the need for frequent defrosting.

[0075] 5. Avoid excessively low temperatures in the defrost curtain, which could cause damage during its raising and lowering motion in the defrosting process, thus improving the defrosting performance of the air conditioner under harsh conditions;

[0076] 6. Preheating can be performed when the defrosting curtain is activated or before the condenser is officially heated. The preheating process does not occupy or reduces the time occupied by heating the condenser, thereby shortening the overall defrosting time.

[0077] 7. The defrosting curtain is powered primarily by photovoltaic power, thus prioritizing the use of photovoltaic energy and achieving its rational utilization.

[0078] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0079] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0080] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0081] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A defrosting method for a heat exchanger, characterized in that, include: Acquire indoor ambient temperature and defrost signal; Determine whether the indoor ambient temperature continuously decreases within a first preset time period; When the indoor ambient temperature continuously decreases within the first preset time period and the defrosting signal is received, the heat exchange device performs the defrosting process. The defrosting method for the heat exchange equipment also includes: During the defrosting process, the outdoor ambient temperature and the execution time of the defrosting process are obtained; Determine whether the execution time of the defrosting process has reached the second preset time; When the defrosting process takes a second preset time, the intermediate temperature of the condenser is obtained; Determine whether the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within a third preset time period; When the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within the third preset time period, the heat exchange equipment stops the defrosting process.

2. The defrosting method for heat exchange equipment according to claim 1, characterized in that, The defrosting method for the heat exchange equipment also includes: After obtaining the outdoor ambient temperature, determine whether the obtained outdoor ambient temperature is greater than 0 degrees. When the outdoor ambient temperature is greater than 0 degrees, the evaporator temperature is obtained; While determining whether the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature within the third preset time period, it is also determined whether the temperature of the evaporator continuously increases within the fourth preset time period. When the intermediate temperature of the condenser is continuously greater than or equal to the sum of the outdoor ambient temperature and the first preset temperature for the third preset time period, and the temperature of the evaporator continuously rises within the fourth preset time period, the heat exchange equipment stops the defrosting process.

3. The defrosting method for heat exchange equipment according to claim 2, characterized in that, The fourth preset duration is set to 30-50 seconds.

4. The defrosting method for heat exchange equipment according to claim 1, characterized in that, The defrosting curtain (10) of the heat exchanger includes multiple independently heated areas, and the defrosting method of the heat exchanger further includes: After obtaining the outdoor ambient temperature and before obtaining the intermediate temperature of the condenser, determine whether the obtained outdoor ambient temperature is greater than 0 degrees. When the outdoor ambient temperature is greater than 0 degrees and the defrosting process takes up the second preset time, at least one area is controlled to stop heating, while at least another area continues to be heated.

5. The defrosting method for heat exchange equipment according to claim 4, characterized in that, All of the aforementioned regions include an upper region (11) located above and a lower region (12) located below, and the defrosting method for the heat exchange equipment further includes: When at least one region is controlled to stop heating and at least another region is controlled to continue heating, the upper region (11) is controlled to stop heating and the lower region (12) is controlled to continue heating.

6. The defrosting method for heat exchange equipment according to claim 1, characterized in that, The first preset temperature is set to 4-18 degrees, the second preset time is set to 40-60 seconds, and the third preset duration is set to 40-60 seconds.

7. The defrosting method for heat exchange equipment according to claim 1, characterized in that, Set the first preset duration to 30-60 seconds.

8. The defrosting method for heat exchange equipment according to claim 1, characterized in that, The defrosting method for the heat exchange equipment further includes a preheating process prior to the defrosting process, the preheating process including: Obtain the outdoor ambient temperature; Determine whether the obtained outdoor ambient temperature is greater than 0 degrees Celsius; When the obtained outdoor ambient temperature is less than or equal to 0 degrees, the heat exchange equipment is controlled to perform the preheating process; When the outdoor ambient temperature is greater than 0 degrees, the temperature of the defrosting curtain (10) of the heat exchange equipment is obtained; Determine whether the temperature of the obtained defrosting curtain (10) is less than or equal to 0 degrees; When the temperature of the defrosting curtain (10) is less than or equal to 0 degrees, the heat exchange equipment is controlled to perform the preheating process.

9. The defrosting method for heat exchange equipment according to claim 8, characterized in that, The preheating process also includes: Obtain the temperature of the defrosting curtain (10); Determine whether the temperature of the defrosting curtain (10) is continuously greater than or equal to the third preset temperature within the fifth preset time period; When the temperature of the defrosting curtain (10) is continuously greater than or equal to the third preset temperature within the fifth preset time period, the preheating process is stopped and the defrosting process is executed.

10. The defrosting method for heat exchange equipment according to claim 9, characterized in that, The fifth preset duration is set to 30-60 seconds, and the third preset temperature is set to 20-40 degrees Celsius.

11. The defrosting method for heat exchange equipment according to claim 1, characterized in that, The defrosting process includes: Stop the external fan of the heat exchange equipment; The defrosting curtain (10) of the heat exchanger is lowered, and the defrosting curtain (10) is activated to heat and defrost the condenser.

12. The defrosting method for heat exchange equipment according to claim 11, characterized in that, The defrosting process also includes: Obtain the outdoor ambient temperature before the outdoor fan of the heat exchange equipment stops; Determine whether the outdoor ambient temperature is greater than 0 degrees Celsius; When the outdoor ambient temperature is greater than 0 degrees, the four-way valve of the heat exchange equipment shall not be switched. When the outdoor ambient temperature is less than or equal to 0 degrees, the four-way valve of the heat exchange equipment is driven to switch, and the defrosting curtain (10) is driven to descend, so that the external fan is controlled to rotate at a predetermined speed.

13. The defrosting method for a heat exchanger according to any one of claims 8 to 12, characterized in that, The defrosting method for the heat exchange equipment also includes: Before the defrosting curtain (10) is activated, the power of the internal power supply mechanism is obtained; Determine whether the battery level is greater than 0; When the obtained power is greater than 0, the defrosting curtain (10) obtains power from the internal power supply mechanism to perform the operation; When the obtained power is less than or equal to 0, the defrosting curtain (10) obtains the power from outside the heat exchange equipment to perform the operation.

14. The defrosting method for heat exchange equipment according to claim 1, characterized in that, The defrosting method for the heat exchange equipment also includes: Before performing the defrosting process, obtain the set temperature; Determine whether the indoor ambient temperature is greater than or equal to the difference between the set temperature and the fourth preset temperature; When the obtained indoor ambient temperature is greater than or equal to the difference between the set temperature and the fourth preset temperature, the heat exchange device is in the first parameter state; otherwise, the heat exchange device is in the second parameter state. Specifically, the first preset duration in the first parameter state is set to be greater than the first preset duration in the second parameter state, the second preset time in the first parameter state is set to be less than the second preset time in the second parameter state, the third preset duration in the first parameter state is set to be less than the third preset duration in the second parameter state, and the first preset temperature in the first parameter state is set to be less than the first preset temperature in the second parameter state.

15. The defrosting method for heat exchange equipment according to claim 14, characterized in that, The fourth preset temperature is set to 2-5 degrees Celsius.

16. A defrosting mechanism, characterized in that, A defrosting method for a heat exchanger according to any one of claims 1 to 15, wherein the defrosting mechanism comprises: A defrosting curtain (10) located on the side of the condenser has a defrosting state that blocks the side of the condenser and a retracted state that avoids the side of the condenser. The defrosting curtain (10) has a heating element to defrost the condenser. Multiple temperature sensors (20) are installed on the outdoor unit, indoor unit, condenser, evaporator, and defrost curtain (10) and are used to detect the outdoor ambient temperature, indoor ambient temperature, condenser intermediate temperature, evaporator temperature, and defrost curtain temperature.

17. The defrosting mechanism according to claim 16, characterized in that, The defrosting curtain (10) includes an upper region (11) and a lower region (12). The upper region (11) and the lower region (12) each have independently operating heating elements, and the temperature detection element (20) on the defrosting curtain (10) is located in the lower region (12).

18. The defrosting mechanism according to claim 17, characterized in that, The temperature sensing element (20) is located at the bottom of the lower region (12).

19. The defrosting mechanism according to claim 16, characterized in that, The defrosting mechanism also includes: Drive unit (30); A rotating shaft (40) is driven to connect with the driving member (30). The top end of the defrosting curtain (10) is connected to the rotating shaft (40). The rotating shaft (40) is rotatably configured and can roll up the defrosting curtain (10) so that the defrosting curtain (10) rises away from the side of the condenser.

20. A heat exchange device, characterized in that, It includes an internal power supply mechanism and a defrosting mechanism as described in any one of claims 16 to 19, wherein the internal power supply mechanism is electrically connected to the defrosting mechanism and supplies power to the defrosting mechanism.

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