Heat pump system anti-frosting method based on vibration, fin heat exchanger and heat pump system

Abstract

The invention belongs to the technical field of heat pumps, and discloses a heat pump system anti-frosting method based on vibration, a fin type heat exchanger and a heat pump system.The heat pump system anti-frosting method based on vibration is used for preventing the fin type heat exchanger of the heat pump system from frosting, and fins of the fin type heat exchanger are provided with vibration generating units; the heat pump system anti-frosting method based on vibration comprises the following steps that whether a fin heat exchanger is dewed or not is judged, whether the fin heat exchanger is frosted or not is judged, if the fin heat exchanger is dewed, the vibration generating unit starts a first vibration mode with the vibration frequency of f1, and if the fin heat exchanger is frosted, the vibration generating unit starts a second vibration mode with the vibration frequency of f2; if the vibration frequency is f1, the vibration generating unit starts a second vibration mode with the vibration frequency of f2, f2 is larger than f1, and according to the anti-frosting method for the heat pump system based on vibration, dewdrops and frost layers on the fin type heat exchanger can be removed, and energy consumption during dewdrop removal can also be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and particularly to a method for preventing frosting of a heat pump system based on vibration, a fin heat exchanger, and a heat pump system. Background Art

[0002] As an efficient heating and cooling device, the heat pump system has been widely used in fields such as shopping malls and residences.

[0003] When the heat pump system operates for heating in winter, frosting easily occurs on the fin heat exchanger located outdoors. The frost layer will increase the thermal resistance of the fin heat exchanger, thereby reducing the heat transfer efficiency of the fin heat exchanger, reducing the performance of the heat pump system, and increasing the energy consumption of the heat pump system.

[0004] Therefore, there is an urgent need to propose a method for preventing frosting of a heat pump system based on vibration, a fin heat exchanger, and a heat pump system to solve the above technical problems. Summary of the Invention

[0005] The first object of the present invention is to provide a method for preventing frosting of a heat pump system based on vibration. This method for preventing frosting of a heat pump system based on vibration can not only remove dew and frost layers on the fin heat exchanger, but also reduce the energy consumption during dew removal.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] A method for preventing frosting of a heat pump system based on vibration is used to prevent frosting of the fin heat exchanger of the heat pump system. A vibration generating unit is provided on the fins of the fin heat exchanger, and the vibration generating unit can cause the fins to vibrate. The method for preventing frosting of a heat pump system based on vibration includes the following steps:

[0008] Judge whether the fin heat exchanger is dew condensation and judge whether the fin heat exchanger is frosting;

[0009] If the fin heat exchanger is dew condensation, the vibration generating unit starts the first vibration mode with a vibration frequency of f1;

[0010] If the fin heat exchanger is frosting, the vibration generating unit starts the second vibration mode with a vibration frequency of f2, where f2 > f1.

[0011] Optionally, the method for judging whether the fin heat exchanger is dew condensation includes:

[0012] Monitor the ambient temperature T and ambient humidity RH of the environment where the fin heat exchanger is located;

[0013] If T ≤ T1 and RH ≥ RH1, it is determined that the fin heat exchanger is dew condensation; where T1 is a preset ambient temperature and RH1 is a preset ambient humidity;

[0014] And / or, a method for determining whether a fin heat exchanger is frosted includes:

[0015] Monitoring the surface temperature value ΔT of the fin heat exchanger and the pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger;

[0016] If ΔT≥ΔT1, or ΔP≥ΔP1, it is determined that the fin heat exchanger is frosted; where ΔT1 is a preset first surface temperature value and ΔP1 is a preset first pressure difference;

[0017] And / or, a method for preventing frosting of a heat pump system based on vibration further includes the following steps:

[0018] After the vibration generating unit starts the first vibration mode, it is determined whether the fin heat exchanger is frosted. If it is determined that the fin heat exchanger is frosted, the vibration generating unit changes from the first vibration mode to the second vibration mode.

[0019] Optionally, a method for preventing frosting of a heat pump system based on vibration further includes the following steps:

[0020] Judging whether the frost layer thickness h on the fin heat exchanger and the preset thickness h1 satisfy h≥h1;

[0021] If h≥h1 is satisfied and the vibration generating unit is not started, the vibration generating unit starts the third vibration mode, and the heat pump system starts the defrosting mode;

[0022] If the vibration generating unit is in the second vibration mode when h≥h1 is satisfied, the vibration generating unit changes from the second vibration mode to the third vibration mode, and the heat pump system starts the defrosting mode.

[0023] Optionally, a method for judging whether the frost layer thickness h on the fin heat exchanger and the preset thickness h1 satisfy h≥h1 includes:

[0024] Monitoring the surface temperature value ΔT of the fin heat exchanger and the pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger;

[0025] If ΔT≥ΔT2 and ΔP≥ΔP2, it is determined that h and h1 satisfy h≥h1; where ΔT2 is a preset second surface temperature value and ΔP2 is a preset second pressure difference.

[0026] Optionally, when judging whether h and h1 satisfy h≥h1:

[0027] First judge whether ΔT≥ΔT2 is satisfied. If ΔT≥ΔT2 is not satisfied, then do not judge whether ΔP≥ΔP2 is satisfied;

[0028] Or, first judge whether ΔP≥ΔP2 is satisfied. If ΔP≥ΔP2 is not satisfied, then do not judge whether ΔT≥ΔT2 is satisfied.

[0029] Optionally, the vibration-based frost prevention method for a heat pump system further includes the following steps:

[0030] Determine whether there is dirt on the fin heat exchanger. If there is dirt on the fin heat exchanger, the vibration generating unit starts the fourth vibration mode.

[0031] Optionally, the method for determining whether there is dirt on the fin heat exchanger includes:

[0032] Monitor the air pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger. If ΔP > ΔP3, it is determined that there is dirt on the fin heat exchanger; where ΔP3 is a preset third air pressure difference;

[0033] And / or, monitor the air pressure P in the compressor suction pipeline of the heat pump system. If P > P1, it is determined that there is dirt on the fin heat exchanger; where P1 is a preset air pressure.

[0034] Optionally, the vibration-based frost prevention method for a heat pump system further includes the following steps:

[0035] After the vibration generating unit is started, monitor the stress value F of the heat exchange tubes of the fin heat exchanger;

[0036] If F ≥ F1, reduce the vibration frequency of the vibration generating unit; where F1 is a preset stress value.

[0037] The second object of the present invention is to provide a fin heat exchanger that can remove dew and frost layers on the fin heat exchanger by vibration and has low energy consumption during dew removal.

[0038] To achieve this purpose, the present invention adopts the following technical solutions:

[0039] A fin heat exchanger, including a vibration generating unit, heat exchange tubes, and a plurality of fins. The plurality of fins are arranged in sequence in the same direction, the heat exchange tubes are sequentially passed through the plurality of fins, the vibration generating unit is arranged on the fins, the vibration generating unit can vibrate the fins, and the vibration generating unit executes the above-mentioned vibration-based frost prevention method for a heat pump system.

[0040] The third object of the present invention is to provide a heat pump system that can remove dew and frost layers on the fin heat exchanger by vibration and has low energy consumption during dew removal.

[0041] To achieve this purpose, the present invention adopts the following technical solutions:

[0042] A heat pump system, including the above-mentioned fin heat exchanger.

[0043] The beneficial effects of the present invention:

[0044] The anti - frosting method for a heat pump system based on vibration provided by the present invention determines whether the fin - tube heat exchanger is dew - forming. If the fin - tube heat exchanger is dew - forming, the vibration generating unit starts the first vibration mode to vibrate the fins of the fin - tube heat exchanger, and the dew on the fins and heat exchange tubes of the fin - tube heat exchanger falls off with the vibration, achieving the effect of dew removal, and further achieving the effect of preventing the fin - tube heat exchanger from frosting. The anti - frosting method for a heat pump system based on vibration also determines whether the fin - tube heat exchanger is frosting. If the fin - tube heat exchanger is frosting, the vibration generating unit starts the second vibration mode to vibrate the fins of the fin - tube heat exchanger, and the frost layer on the fins and heat exchange tubes of the fin - tube heat exchanger falls off with the vibration, achieving the effect of defrosting. In addition, compared with dew, the adhesion of the frost layer is greater. Therefore, the vibration frequency f2 when the vibration generating unit starts the second vibration mode is greater than the vibration frequency f1 of the first vibration mode, so that the frost layer on the fins and heat exchange tubes can fall off smoothly, not only achieving the effect of efficient defrosting, but also reducing the energy consumption during dew removal. Description of the Drawings

[0045] Figure 1 is the schematic diagram of the heat pump system provided by the present invention;

[0046] Figure 2 is the flowchart of the anti - frosting method for a heat pump system based on vibration provided by the present invention;

[0047] Figure 3 is the schematic diagram of the anti - frosting device provided by the present invention.

[0048] In the figure:

[0049] 100, vibration generating unit; 200, controller; 300, detection unit; 310, temperature - humidity sensor; 320, infrared thermal imager; 330, pressure sensor; 340, differential pressure sensor; 350, stress sensor; 400, heat pump system; 410, four - way valve; 420, compressor; 430, fin - tube heat exchanger; 431, fins; 440, throttle valve; 450, indoor unit; 460, fan. Detailed Embodiments

[0050] The present invention will be further described in detail below with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. Additionally, it should be noted that for the sake of description, only parts related to the present invention are shown in the drawings, not all structures.

[0051] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above the top of", and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below the bottom of", and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0053] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0054] This embodiment provides a method for preventing frosting of a heat pump system based on vibration. This method for preventing frosting of a heat pump system based on vibration can not only remove the dew on the fin heat exchanger, playing a role in preventing the fin heat exchanger from frosting, but also can reduce the energy consumption of the vibration generating unit when removing the dew. In addition, this method for preventing frosting of a heat pump system based on vibration can also remove the frost layer on the fin heat exchanger, avoiding the increase of internal resistance of the fin heat exchanger. The above-mentioned fin heat exchanger is a common heat exchange structure in the art, which includes a plurality of fins and a plurality of heat exchange tubes. Among them, the plurality of fins are arranged in sequence in the same direction, the axes of the plurality of heat exchange tubes are parallel to each other, and each heat exchange tube passes through a plurality of fins in sequence.

[0055] This method for preventing frosting of a heat pump system based on vibration is used to prevent the fin heat exchanger of the heat pump system from frosting, such as Figure 1As shown, a vibration generating unit 100 (such as a linear motor, an electrodynamic shaker, or an electromagnetic shaker, etc.) is provided on the fin 431 of the fin heat exchanger 430. The vibration generating unit 100 can vibrate the fin 431. Since the heat exchange tubes are passed through the fin 431, when the fin 431 vibrates, it can drive the heat exchange tubes to vibrate together.

[0056] As Figure 2 shown, the vibration-based frost prevention method for a heat pump system includes the following steps: determining whether the fin heat exchanger 430 is dew condensation and determining whether the fin heat exchanger 430 is frosting; if the fin heat exchanger 430 is dew condensation, the vibration generating unit 100 starts the first vibration mode with a vibration frequency of f1; if the fin heat exchanger 430 is frosting, the vibration generating unit 100 starts the second vibration mode with a vibration frequency of f2, where f2 > f1.

[0057] For the vibration-based frost prevention method of the heat pump system, it is determined whether the fin heat exchanger 430 is dew condensation. If the fin heat exchanger 430 is dew condensation, the vibration generating unit 100 starts the first vibration mode to vibrate the fin 431 of the fin heat exchanger 430. The dew on the fin 431 and the heat exchange tubes of the fin heat exchanger 430 falls off with the vibration, achieving the effect of dew removal, and further achieving the effect of preventing the fin heat exchanger 430 from frosting.

[0058] The vibration-based frost prevention method of the heat pump system also determines whether the fin heat exchanger 430 is frosting. If the fin heat exchanger 430 is frosting, the vibration generating unit 100 starts the second vibration mode to vibrate the fin 431 of the fin heat exchanger 430. The frost layer on the fin 431 and the heat exchange tubes of the fin heat exchanger 430 falls off with the vibration, achieving the effect of defrosting.

[0059] In addition, compared with dew, the adhesion of the frost layer is greater. Therefore, the vibration frequency f2 when the vibration generating unit 100 starts the second vibration mode is greater than the vibration frequency f1 of the first vibration mode, so that the frost layer on the fin 431 and the heat exchange tubes can fall off smoothly, not only achieving the effect of efficient defrosting, but also reducing the energy consumption during dew removal.

[0060] It should be noted that the specific values of the above f1 and f2 can be determined according to the actual use conditions and usage requirements. For example, f1 can be 20%, 30%, or 40%, etc. Usually, f1 being 20% - 40% can be applicable to most working conditions. f2 can be 60%, 80%, or 90%, etc. Usually, f2 being 60% - 90% can be applicable to most working conditions.

[0061] Optionally, the method for determining whether the fin heat exchanger 430 is dew - condensed includes: monitoring the ambient temperature T and the ambient humidity RH of the environment where the fin heat exchanger 430 is located; if T ≤ T1 and RH ≥ RH1, it is determined that the fin heat exchanger 430 is dew - condensed, where T1 is a preset ambient temperature and RH1 is a preset ambient humidity. When the ambient temperature is low (i.e., T ≤ T1) and the ambient humidity is high (i.e., RH ≥ RH1), the probability of dew - condensation on the fins 431 and the heat - exchange tubes is relatively high. Therefore, determining whether the fin heat exchanger 430 is dew - condensed by the ambient temperature and the ambient humidity improves the accuracy of determination, reduces the probability of misjudgment, and further improves the effect of preventing the fin heat exchanger 430 from frosting.

[0062] It should be noted that the specific values of T1 and RH1 above can be determined according to the actual operating conditions and usage requirements. For example, T1 can be 3°C or 5°C, etc., and RH1 can be 60% or 70%, etc.

[0063] In other embodiments, other methods can also be used to determine whether the fin heat exchanger 430 is dew - condensed. For example, monitoring whether the fin heat exchanger 430 is dew - condensed through a camera, etc.

[0064] Optionally, the method for determining whether the fin heat exchanger 430 is frosted includes: monitoring the surface temperature value ΔT of the fin heat exchanger 430 and the pressure difference ΔP between the air - inlet side and the air - outlet side of the fin heat exchanger 430; if ΔT ≥ ΔT1 or ΔP ≥ ΔP1, it is determined that the fin heat exchanger 430 is frosted, where ΔT1 is a preset first surface temperature value and ΔP1 is a preset first pressure difference. First, when several of the multiple fins 431 are frosted, the temperature difference between the frosted fins and the unfrosted fins on the surface is large (i.e., ΔT is large). Therefore, when ΔT ≥ ΔT1, it can be determined that the fin heat exchanger 430 is frosted. Second, when several of the multiple fins 431 are frosted, the pressure difference ΔP between the air - inlet side and the air - outlet side of the fin heat exchanger 430 is large. Therefore, when ΔP ≥ ΔP1, it can be determined that the fin heat exchanger 430 is frosted. Third, when either of the two conditions ΔT ≥ ΔT1 and ΔP ≥ ΔP1 is met, it is determined that the fin heat exchanger 430 is frosted, which can greatly reduce the probability of misjudgment and improve the reliability of defrosting.

[0065] In this embodiment, ΔT is the lowest surface temperature value of the fin heat exchanger 430, and ΔT1 is a preset first lowest surface temperature value. Of course, in other embodiments, ΔT can also be the highest surface temperature value of the fin heat exchanger 430, and correspondingly, ΔT1 is a preset first highest surface temperature value.

[0066] It should be noted that the specific values of ΔT1 and ΔP1 above can be determined according to the actual operating conditions and usage requirements. For example, ΔT1 can be 4°C or 6°C, etc., and ΔP1 can be 10 Pa or 12 Pa, etc.

[0067] In other embodiments, other methods may also be used to determine whether the fin heat exchanger 430 is frosted. For example, a camera may be used to monitor whether the fin heat exchanger 430 is frosted, etc.

[0068] Furthermore, the method for determining whether the fin heat exchanger 430 is frosted further includes: ΔT is the surface temperature value at the bottom or the lower half of the fin heat exchanger 430. Since the frost on the fin heat exchanger 430 is formed by the solidification of dew, and under the action of gravity, the dew drops located at the top and the upper half of the fin heat exchanger 430 will flow downward. Therefore, the dew is likely to accumulate in the bottom and lower half regions of the fin heat exchanger 430, and the probability of condensing into frost in the bottom and lower half regions of the fin heat exchanger 430 is greater. Therefore, using the surface temperature value at the bottom or the lower half of the fin heat exchanger 430 as ΔT can improve the accuracy of the determination, reduce the probability of misjudgment, and thus improve the defrosting reliability.

[0069] Optionally, the anti-frost method for the heat pump system based on vibration further includes the following steps: After the vibration generating unit 100 starts the first vibration mode, it determines whether the fin heat exchanger 430 is frosted. If it is determined that the fin heat exchanger 430 is frosted, the vibration generating unit 100 changes from the first vibration mode to the second vibration mode. That is to say, after the vibration generating unit 100 starts the first vibration mode, if it is monitored that the fin heat exchanger 430 is frosted, the vibration generating unit 100 increases the vibration frequency from f1 to f2, so that the vibration frequencies of the fins 431 and the heat exchange tubes increase, and the frost layer on the fins 431 and the heat exchange tubes can fall off smoothly. This method realizes the dynamic monitoring of whether the fin heat exchanger 430 is frosted during the dew removal process and can defrost in time.

[0070] In this embodiment, after the vibration generating unit 100 starts the first vibration mode, it continuously determines whether the fin heat exchanger 430 is frosted to improve the defrosting effect. Of course, in other embodiments, it may also be that after the vibration generating unit 100 starts the first vibration mode, it intermittently determines whether the fin heat exchanger 430 is frosted, that is, determines whether the fin heat exchanger 430 is frosted every other certain period of time.

[0071] In this embodiment, after the vibration generating unit 100 starts the first vibration mode, the method for determining whether the fin heat exchanger 430 is frosted is: monitoring the surface temperature value ΔT of the fin heat exchanger 430 and the air pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger 430; if ΔT≥ΔT1 or ΔP≥ΔP1, it is determined that the fin heat exchanger 430 is frosted.

[0072] Optionally, the vibration-based frost prevention method for the heat pump system further includes the following steps: determining whether the frost layer thickness h on the fin heat exchanger 430 and the preset thickness h1 satisfy h≥h1; if the vibration generating unit 100 has not been started when h≥h1 is satisfied, the vibration generating unit 100 starts the third vibration mode, and the heat pump system 400 starts the defrosting mode; if the vibration generating unit 100 is in the second vibration mode when h≥h1 is satisfied, that is, after the vibration generating unit 100 starts the second vibration mode and h≥h1 is detected, the vibration generating unit 100 changes from the second vibration mode to the third vibration mode, and the heat pump system 400 starts the defrosting mode. When h≥h1, it indicates that the frost layer thickness on the fin heat exchanger 430 is relatively thick. At this time, if defrosting is only carried out by vibration, the defrosting effect is not good. On the one hand, there is a problem that frost remains on the surface of the fin heat exchanger 430, and on the other hand, the defrosting speed is relatively slow. Therefore, when h≥h1, the vibration generating unit 100 starts the third vibration mode and starts the defrosting mode of the heat pump system 400 to achieve a double defrosting effect, solve the problem of frost remaining on the surface of the fin heat exchanger 430, improve the defrosting speed at the same time, and reduce the adverse effects caused by the relatively thick frost layer on the heat pump system 400. In addition, the vibration-based frost prevention method for the heat pump system judges whether h≥h1 is satisfied at two nodes, namely when the vibration generating unit 100 has not been started and after the vibration generating unit 100 starts the second vibration mode, which improves the reliability and timeliness of removing relatively thick frost layers.

[0073] In this embodiment, after the vibration generating unit 100 starts the second vibration mode, it continuously judges whether h≥h1 is satisfied to further improve the reliability and timeliness of removing relatively thick frost layers. Of course, in other implementation schemes, it can also be that after the vibration generating unit 100 starts the second vibration mode, it intermittently judges whether h≥h1 is satisfied, that is, it judges whether h≥h1 is satisfied every other certain time period.

[0074] It should be noted that the specific value of the above h1 can be determined according to the actual use conditions and use requirements. For example, h1 can be 1.5 mm or 2.2 mm, etc.

[0075] It should also be noted that the magnitude relationship between the vibration frequency f3 of the third vibration mode and the vibration frequency f2 of the second vibration mode can be determined according to the actual working conditions and use requirements, that is, f3 can be greater than, less than or equal to f2.

[0076] It should also be noted that the defrosting mode of the above heat pump system 400 is a common defrosting mode in the art. Exemplarily, the defrosting mode of the heat pump system 400 can be a reverse cycle defrosting mode. When the heat pump system 400 starts the reverse cycle defrosting mode, such as Figure 1As shown, the four-way valve 410 in the heat pump system 400 changes its direction, and the flow direction of the refrigerant is changed by the four-way valve 410, so that the high-temperature and high-pressure gaseous refrigerant discharged from the compressor 420 enters the heat exchange tubes (not shown in the figure) of the fin heat exchanger 430 (i.e., the outdoor unit). The high-temperature and high-pressure gaseous refrigerant releases heat in the heat exchange tubes to melt the frost layer on the fins 431 and the heat exchange tubes. The refrigerant after defrosting then passes through the throttle valve 440 and enters the indoor unit 450, thus completing a reverse cycle defrosting cycle. When the frost layer on the fins 431 and the heat exchange tubes melts, the four-way valve 410 changes its direction again to restore the heating mode. The defrosting mode of the heat pump system 400 can also be an electric heating defrosting mode. When the heat pump system 400 starts the electric heating defrosting mode, the heating element (such as a heating rod or heating wire) set near the fins 431 and / or the heat exchange tubes is powered on, and the heating element emits heat to melt the frost layer on the fins 431 and the heat exchange tubes. When the frost layer on the fins 431 and the heat exchange tubes melts, the heating element is powered off. Other defrosting modes of the heat pump system 400 will not be listed one by one here.

[0077] Further, the method for determining whether the frost layer thickness h on the fin heat exchanger 430 and the preset thickness h1 satisfy h≥h1 includes: monitoring the surface temperature value ΔT of the fin heat exchanger 430 and the air pressure difference ΔP between the inlet side and the outlet side of the fin heat exchanger 430; if ΔT≥ΔT2 and ΔP≥ΔP2, it is determined that h and h1 satisfy h≥h1, where ΔT2 is the preset second surface temperature value and ΔP2 is the preset second air pressure difference. When the fin heat exchanger 430 is frosted, both ΔT and ΔP will increase with the increase of the frost layer thickness. Therefore, when ΔT≥ΔT2 and ΔP≥ΔP2, it can be determined that the frost layer thickness h on the fin heat exchanger 430 is above the preset thickness h1. This judgment method is relatively simple and can quickly determine whether h≥h1 is satisfied, thereby shortening the response time for the heat pump system 400 to start the defrosting mode and the response time for the vibration generating unit 100 to start the third vibration mode. In addition, this method needs to simultaneously satisfy the two conditions of ΔT≥ΔT2 and ΔP≥ΔP2 to determine h≥h1, which improves the accuracy of judging the frost layer thickness and can avoid the problem of the heat pump system 400 misstarting the defrosting mode. Since when the heat pump system 400 starts the defrosting mode, there are problems such as increased energy consumption, reduced indoor temperature stability, and a large impact on the heat pump system 400. Therefore, in practical applications, it is necessary to minimize and avoid the heat pump system 400 starting the defrosting mode. The above method for determining whether h≥h1 is satisfied through the two conditions of ΔT≥ΔT2 and ΔP≥ΔP2 avoids the problem of the heat pump system 400 misstarting the defrosting mode, thereby bringing the effects of reducing energy consumption, improving indoor temperature stability, and reducing the impact on the heat pump system 400.

[0078] In this embodiment, ΔT is the lowest surface temperature value of the fin heat exchanger 430, and ΔT2 is the preset second lowest surface temperature value. Of course, in other embodiments, ΔT can also be the highest surface temperature value of the fin heat exchanger 430. Correspondingly, ΔT2 is the preset second highest surface temperature value.

[0079] It should be noted that the specific values of the above ΔT2 and ΔP2 can be determined according to the actual working conditions and usage requirements. For example, ΔT2 can be 7°C or 10°C, etc., and ΔP2 can be 30 Pa or 35 Pa, etc.

[0080] In other embodiments, other methods can also be used to determine whether the frost layer thickness h on the fin heat exchanger 430 and the preset thickness h1 satisfy h≥h1. For example, according to experiments or experience, find the position on the fin heat exchanger 430 where a relatively thick frost layer is likely to occur (such as the bottom area of the fin 431, etc.). Install an opposed sensor at this position. The positions corresponding to the transmitter and receiver of the opposed sensor are the positions when the frost layer thickness reaches h1. When the receiver cannot receive the light beam emitted by the transmitter, it can be determined that the frost layer thickness h has reached h1, that is, h≥h1 is satisfied.

[0081] Furthermore, when judging whether h and h1 satisfy h≥h1: first judge whether ΔP≥ΔP2 is satisfied. When ΔP≥ΔP2 is satisfied, then judge whether ΔT≥ΔT2 is satisfied. When ΔP≥ΔP2 is not satisfied, then do not judge whether ΔT≥ΔT2 is satisfied. This method divides the judgment of whether the frost layer thickness satisfies h≥h1 into two steps, and uses the judgment result of the first step as the basis for whether to start the second step judgment. This method further simplifies the steps of judging the frost layer thickness. Specifically, in the first step, first judge the magnitude relationship between ΔP and ΔP2. When ΔP≥ΔP2, it can be preliminarily determined that the frost layer thickness satisfies h≥h1. At this time, perform the second step judgment, that is, judge whether ΔT≥ΔT2 is satisfied. If ΔT≥ΔT2, it is determined that the judgment result of the first step is correct, that is, the frost layer thickness satisfies h≥h1. If the judgment result of the first step is that ΔP≥ΔP2 is not satisfied (i.e., ΔP<ΔP2), then it is not necessary to judge the magnitude relationship between ΔT and ΔT2, and it can be directly determined that the frost layer thickness does not satisfy h≥h1.

[0082] In another embodiment, it is also possible to first determine whether ΔT≥ΔT2 is satisfied. When ΔT≥ΔT2 is satisfied, then determine whether ΔP≥ΔP2 is satisfied. When ΔT≥ΔT2 is not satisfied, then do not determine whether ΔP≥ΔP2 is satisfied. This method also divides the determination of whether the frost layer thickness satisfies h≥h1 into two steps, and uses the determination result of the first step as the basis for whether to start the second step of determination, further simplifying the steps for determining the frost layer thickness. Specifically, in the first step, first determine the magnitude relationship between ΔT and ΔT2. When ΔT≥ΔT2, it can be preliminarily determined that the frost layer thickness satisfies h≥h1. At this time, perform the second step of determination, that is, determine whether ΔP≥ΔP2 is satisfied. If ΔP≥ΔP2, then determine that the determination result of the first step is correct, that is, the frost layer thickness satisfies h≥h1. If the determination result of the first step is that ΔT≥ΔT2 is not satisfied (i.e., ΔT<ΔT2), then directly determine that the frost layer thickness does not satisfy h≥h1 without determining the magnitude relationship between ΔP and ΔP2.

[0083] In practical applications, multiple corresponding data of ΔP2 and the frost layer thickness, as well as multiple corresponding data of ΔT2 and the frost layer thickness, can be obtained based on multiple tests. For example, when ΔP2 = 30 Pa, the corresponding frost layer thickness is 1.2 mm; when ΔP2 = 35 Pa, the corresponding frost layer thickness is 1.5 mm; when ΔT2 = 10 °C, the corresponding frost layer thickness is 1.3 mm; when ΔT2 = 13 °C, the corresponding frost layer thickness is 1.6 mm, etc. Then, when the actual ΔP value and the actual ΔT value are detected, the frost layer thickness value corresponding to the ΔP value and the frost layer thickness value corresponding to the ΔT value can be quickly obtained. This method can further simplify the steps for determining the frost layer thickness.

[0084] Optionally, as Figure 2As shown, the method for preventing frosting of a vibration-based heat pump system further includes the following steps: After starting the monitoring, first determine whether the fin heat exchanger 430 is dew condensation. If it is determined that the fin heat exchanger 430 is not dew condensation (hereinafter referred to as zero-level risk), the monitoring is directly ended. After a certain period of time, determine again whether the fin heat exchanger 430 is dew condensation. If it is determined that the fin heat exchanger 430 is dew condensation, start to determine the risk level. If it is determined that the fin heat exchanger 430 is not frosted, that is, the fin heat exchanger 430 only has dew condensation and no frost (hereinafter referred to as first-level risk), the vibration generating unit 100 starts the first vibration mode. If it is determined that the fin heat exchanger 430 is frosted (hereinafter referred to as second-level risk), the vibration generating unit 100 starts the second vibration mode. If it is determined that the frost layer thickness on the fin heat exchanger 430 satisfies h≥h1 (hereinafter referred to as third-level risk), the vibration generating unit 100 starts the third vibration mode, and the heat pump system 400 starts the defrosting mode. This method shortens the response time of the defrosting operation when the fin heat exchanger 430 is in the second-level risk and the third-level risk, achieving a more rapid and effective defrosting effect. When the fin heat exchanger 430 is in the zero-level risk, the monitoring is directly ended, simplifying the monitoring steps and saving energy consumption. In addition, in this embodiment, after it is determined that the fin heat exchanger 430 is in the first-level risk, continuous monitoring is still carried out to determine whether the fin heat exchanger 430 changes from the first-level risk to the second-level risk or the third-level risk. When it changes to the second-level risk or the third-level risk, the corresponding defrosting mode is started to achieve a timely and efficient defrosting effect.

[0085] Further, after the vibration generating unit 100 starts the third vibration mode and the heat pump system 400 starts the defrosting mode, determine whether the defrosting mode of the heat pump system 400 is completed. When the defrosting mode of the heat pump system 400 is completed, the vibration generating unit 100 stops vibrating and re-determines whether the fin heat exchanger 430 is dew condensation to achieve the effect of reducing energy consumption.

[0086] It should be noted that the method for determining whether the defrosting mode of the heat pump system 400 is completed is the prior art in this field. Exemplarily, after the defrosting mode of the heat pump system 400 is started for a preset duration, it can be determined that the defrosting mode of the heat pump system 400 is completed.

[0087] Optionally, the method for preventing frosting of a vibration-based heat pump system further includes the following steps: Determine whether there is dirt on the fin heat exchanger 430. If there is dirt on the fin heat exchanger 430, the vibration generating unit 100 starts the fourth vibration mode. The vibration generating unit 100 emits vibrations to make the fins 431 vibrate, and the fins 431 drive the heat exchange tubes to vibrate together, causing the dirt on the fins 431 and / or the heat exchange tubes to fall off, achieving a descaling effect.

[0088] Further, the method for determining whether there is dirt on the fin heat exchanger 430 includes: monitoring the air pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger 430. If ΔP > ΔP3, it is determined that there is dirt on the fin heat exchanger 430, where ΔP3 is a preset third air pressure difference. When there is dirt (such as dust, etc.) on the fins 431, the air pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger 430 will increase. Therefore, by monitoring ΔP, when ΔP > ΔP3, it can be determined that there is dirt on the fins 431 of the fin heat exchanger 430. At this time, the vibration generating unit 100 starts the fourth vibration mode to vibrate the fins 431, so that the dirt on the fins 431 falls off. After the dirt falls off from the fins 431, it is blown away by the blower 460 adjacent to the fin heat exchanger 430 (such as Figure 1 shown), thereby realizing the efficient scale removal of the fins 431 and achieving the effect of improving the heat exchange efficiency of the fin heat exchanger 430.

[0089] It should be noted that the specific value of the above ΔP3 can be determined according to the actual use conditions and usage requirements. For example, ΔP3 can be 40 Pa or 42 Pa, etc.

[0090] Further, the method for determining whether there is dirt on the fin heat exchanger 430 includes: monitoring the air pressure P in the suction pipe of the compressor 420 of the heat pump system 400. If P > P1, it is determined that there is dirt on the fin heat exchanger 430, where P1 is a preset air pressure. When there are deposited impurities in the heat exchange tubes or scale forms on the inner walls of the heat exchange tubes (hereinafter referred to as dirt in the heat exchange tubes), the resistance of the refrigerant flowing in the heat exchange tubes increases, which will cause the air pressure P in the suction pipe of the compressor 420 of the heat pump system 400 to rise. Therefore, by monitoring P, when P > P1, it can be determined that there is dirt in the heat exchange tubes of the fin heat exchanger 430. At this time, the vibration generating unit 100 starts the fourth vibration mode to vibrate the fins 431, and the fins 431 drive the heat exchange tubes to vibrate together, so that the dirt on the inner walls of the heat exchange tubes falls off and the dirt deposited in the heat exchange tubes floats up. The dirt flows together with the refrigerant in the heat exchange tubes until it reaches the filter of the heat pump system 400 and is filtered out, thereby realizing the efficient scale removal of the heat exchange tubes and achieving the effect of extending the service life of the heat pump system 400.

[0091] It should be noted that the specific value of the above P1 can be determined according to the actual use conditions and usage requirements. For example, P1 can be 33 Pa or 36 Pa, etc.

[0092] In this embodiment, ΔP and P are monitored simultaneously. When ΔP > ΔP3 or P > P1, the fourth vibration mode of the vibration generating unit 100 is activated. That is to say, when there is dirt on either the fin 431 or the heat exchange tube, the fourth vibration mode of the vibration generating unit 100 is activated, which can improve the descaling effect. Of course, in other implementation schemes, only one of ΔP and P can also be detected, depending on the actual usage requirements.

[0093] In this embodiment, the magnitude relationship between the vibration frequency f4 of the fourth vibration mode and f1, f2, and f3 is not limited and can be determined according to actual application requirements.

[0094] In other implementation schemes, other methods can also be used to determine whether there is dirt on the fin 431. For example, visually observe whether there is dirt on the fin 431 manually. In other implementation schemes, other methods can also be used to determine whether there is dirt in the heat exchange tube. For example, monitor the pressure difference between the inlet and outlet of the heat exchange tube. When the pressure difference between the inlet and outlet of the heat exchange tube reaches a preset pressure difference value, it can be determined that there is dirt in the heat exchange tube.

[0095] It should be noted that when the vibration generating element activates the first vibration mode, the second vibration mode, or the third vibration mode, the fin 431 and the heat exchange tube vibrate together. At this time, the dirt on the fin 431 and the heat exchange tube can also fall off, that is, there is also a certain descaling effect at this time.

[0096] Optionally, the vibration-based heat pump system anti-frost method further includes the following steps: After the vibration generating unit 100 is started (starting the first vibration mode, the second vibration mode, the third vibration mode, or the fourth vibration mode), monitor the stress value F of the heat exchange tube of the fin heat exchanger 430; if F ≥ F1, reduce the vibration frequency of the vibration generating unit 100, where F1 is a preset stress value. If the stress value F of the heat exchange tube is too large, the heat exchange tube is prone to rupture due to excessive stress. Therefore, after the vibration generating unit 100 is started, monitor the F value. When F ≥ F1, regardless of which vibration mode the vibration generating unit 100 is in, the vibration frequency of the vibration generating unit 100 should be reduced to reduce the stress value of the heat exchange tube and avoid the problem of the heat exchange tube rupturing, providing a guarantee for the normal operation of the heat pump system 400.

[0097] It should be noted that the specific value of the above F1 can be determined according to the actual usage conditions and requirements. For example, F1 can be 50 N / m 2 or 60 N / m 2 etc.

[0098] Optionally, the vibration-based frost prevention method for a heat pump system further includes the following steps: dynamically adjusting the power of the vibration generating unit 100 according to historical operating parameters (such as historical frosting frequency, historical defrosting effect, or defrosting energy consumption per unit time). For example, increasing the power of the vibration generating unit 100 by 10% in relatively cold regions, etc., so as to achieve the effect of reducing energy consumption on the basis of efficient defrosting, dew removal, and scale removal.

[0099] In the vibration-based frost prevention method for a heat pump system provided in this embodiment, the vibration energy emitted by the vibration generating unit 100 directly acts on dew drops, frost layers, and dirt, enabling the dew drops, frost layers, and dirt to fall off quickly, thereby improving the efficiency of dew removal, defrosting, and scale removal. Compared with the defrosting mode of the traditional heat pump system 400, this vibration-based frost prevention method for a heat pump system can defrost by vibration, without consuming a large amount of heat to melt the frost layer, reducing the energy consumption during the defrosting process. This vibration-based frost prevention method for a heat pump system combines multiple judgment modes, corresponding to non-vibration modes when the fin heat exchanger 430 is at zero risk, first-level risk, second-level risk, third-level risk, and scale removal is required, and can automatically adjust according to the actual situation, achieving intelligent dew removal, defrosting, and scale removal effects, and also significantly reducing the frequency of starting the defrosting mode of the heat pump system 400, playing a guarantee role in reducing defrosting energy consumption, improving the stability of indoor temperature, and reducing the impact on the heat pump system 400.

[0100] This embodiment also provides a frost prevention device, such as Figure 1 and Figure 3As shown in the figure, the anti-frost device includes a vibration generating unit 100, a controller 200, and a detection unit 300. Among them, the vibration generating unit 100 is installed on the top of the fin 431 and fits with the top of the fin 431. The controller 200 can be a common control element in the field such as a microprocessor or a single-chip microcomputer. The detection unit 300 includes a temperature and humidity sensor 310, an infrared thermal imager 320, a pressure sensor 330, a differential pressure sensor 340, and a stress sensor 350. The vibration generating unit 100, the temperature and humidity sensor 310, the infrared thermal imager 320, the pressure sensor 330, the differential pressure sensor 340, the stress sensor 350, and the heat pump system 400 are all connected to the controller 200 by signals. The temperature and humidity sensor 310, the infrared thermal imager 320, the pressure sensor 330, the differential pressure sensor 340, and the stress sensor 350 transmit the collected data parameters to the controller 200. The controller 200 is used to process the above data (for example, comparing T and T1), and control the start and stop, vibration frequency, vibration amplitude, and vibration duration of the vibration generating unit 100 according to the processing results and the vibration-based anti-frost method of the heat pump system provided in this embodiment. In addition, when the processing result of the controller 200 is that the fin heat exchanger 430 is at a third-level risk, the controller 200 can also control the heat pump system 400 to start the defrosting mode.

[0101] It should be noted that the method for the controller 200 to control the start and stop, vibration frequency, vibration amplitude, and vibration duration of the vibration generating unit 100, and the method for the controller 200 to control the heat pump system 400 to start the defrosting mode are all prior arts and will not be elaborated here.

[0102] Further, the temperature and humidity sensor 310 is installed on the air inlet side of the fin heat exchanger 430 to detect the ambient temperature T and ambient humidity RH of the environment where the fin heat exchanger 430 is located. The infrared thermal imager 320 is installed in the lower area on the air inlet side of the fin heat exchanger 430 so that the infrared thermal imager 320 can cover the lower half area of the fin heat exchanger 430, and is used to detect the surface temperature value ΔT of the lower half of the fin heat exchanger 430. The pressure sensor 330 is installed on the return air pipe of the compressor 420 to detect the air pressure P in the return air pipe of the compressor 420. The differential pressure sensor 340 is installed across the air inlet side and the air outlet side of the fin heat exchanger 430. It is best to ensure that the distance between the two measurement points is the same as the thickness of the fin 431 evaporator to improve the measurement accuracy. The differential pressure sensor 340 is used to detect the air pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger 430. The stress sensor 350 is installed on the heat exchange tube to detect the stress of the heat exchange tube.

[0103] This embodiment also provides a fin heat exchanger 430, which includes a vibration generating unit 100, heat exchange tubes, and a plurality of fins 431. Exemplarily, the number of fins 431 can be thirty, forty, fifty, etc. The plurality of fins 431 are arranged in sequence in the same direction, and the heat exchange tubes are sequentially passed through the plurality of fins 431. The vibration generating unit 100 is arranged on the fins 431, and the vibration generating unit 100 can vibrate the fins 431. The vibration generating unit 100 executes the above-mentioned anti-frost method for a heat pump system based on vibration. Thus, dew and frost can be removed by vibration, and the energy consumption during dew removal is small.

[0104] In this embodiment, the vibration generating unit 100 is arranged on the top of the fins 431 and is attached to the top of the fins 431. In other embodiments, the vibration generating unit 100 can also be arranged on the side wall or bottom of the fins 431, etc.

[0105] In this embodiment, the vibration generating unit 100 is a linear motor. In other embodiments, the vibration generating unit 100 can also be an electric exciter or an electromagnetic exciter, etc.

[0106] This embodiment also provides a heat pump system, which includes the above-mentioned fin heat exchanger. Thus, dew and frost layers on the fin heat exchanger can be removed by vibration, and the energy consumption during dew removal is small.

[0107] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A method for preventing frosting in a vibration-based heat pump system, characterized in that The vibration-based frost prevention method for a heat pump system is used to prevent frosting of the fin heat exchanger of the heat pump system. A vibration generating unit is provided on the fins of the fin heat exchanger, and the vibration generating unit can vibrate the fins. The vibration-based frost prevention method for the heat pump system includes the following steps: Judge whether the fin heat exchanger is dew condensation and judge whether the fin heat exchanger is frosting; If the fin heat exchanger is dew condensation, the vibration generating unit starts the first vibration mode with a vibration frequency of f1; If the fin heat exchanger is frosting, the vibration generating unit starts the second vibration mode with a vibration frequency of f2, where f2 > f1.

2. The method for preventing frosting of a vibration-based heat pump system according to claim 1, characterized in that, The method for judging whether the fin heat exchanger is dew condensation includes: Monitor the ambient temperature T and the ambient humidity RH of the environment where the fin heat exchanger is located; If T ≤ T1 and RH ≥ RH1, it is determined that the fin heat exchanger is dew condensation; where T1 is a preset ambient temperature and RH1 is a preset ambient humidity; And / or, the method for judging whether the fin heat exchanger is frosting includes: Monitor the surface temperature value ΔT of the fin heat exchanger and the wind pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger; If ΔT ≥ ΔT1 or ΔP ≥ ΔP1, it is determined that the fin heat exchanger is frosting; where ΔT1 is a preset first surface temperature value and ΔP1 is a preset first wind pressure difference; And / or, the vibration-based frost prevention method for the heat pump system further includes the following steps: After the vibration generating unit starts the first vibration mode, judge whether the fin heat exchanger is frosting. If it is determined that the fin heat exchanger is frosting, the vibration generating unit changes from the first vibration mode to the second vibration mode.

3. The method for preventing frosting of a vibration-based heat pump system according to claim 1, wherein, The vibration-based frost prevention method for the heat pump system further includes the following steps: Judge whether the frost layer thickness h on the fin heat exchanger and the preset thickness h1 satisfy h ≥ h1; If the vibration generating unit is not started when h ≥ h1 is satisfied, the vibration generating unit starts the third vibration mode, and the heat pump system starts the defrosting mode; If the vibration generating unit is in the second vibration mode when h ≥ h1 is satisfied, the vibration generating unit changes from the second vibration mode to the third vibration mode, and the heat pump system starts the defrosting mode.

4. The method for preventing frosting of a vibration-based heat pump system according to claim 3, characterized in that, The method for judging whether the frost layer thickness h on the fin heat exchanger and the preset thickness h1 satisfy h ≥ h1 includes: Monitor the surface temperature value ΔT of the fin heat exchanger and the wind pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger; If ΔT ≥ ΔT2 and ΔP ≥ ΔP2, it is determined that h and h1 satisfy h ≥ h1; where ΔT2 is a preset second surface temperature value and ΔP2 is a preset second wind pressure difference.

5. The method for preventing frosting of a vibration-based heat pump system according to claim 4, wherein When judging whether h and h1 satisfy h ≥ h1: First judge whether ΔT ≥ ΔT2 is satisfied. If ΔT ≥ ΔT2 is not satisfied, then no longer judge whether ΔP ≥ ΔP2 is satisfied; Or, first judge whether ΔP ≥ ΔP2 is satisfied. If ΔP ≥ ΔP2 is not satisfied, then no longer judge whether ΔT ≥ ΔT2 is satisfied.

6. The method for preventing frosting of a vibration-based heat pump system according to claim 1, wherein The vibration-based frost prevention method for the heat pump system further includes the following steps: Determine whether there is dirt on the fin heat exchanger. If there is dirt on the fin heat exchanger, the vibration generating unit starts the fourth vibration mode.

7. The method for preventing frosting of a vibration-based heat pump system according to claim 6, wherein The method for determining whether there is dirt on the fin heat exchanger includes: Monitoring the air pressure difference ΔP between the air inlet side and the air outlet side of the fin heat exchanger. If ΔP > ΔP3, it is determined that there is dirt on the fin heat exchanger; where ΔP3 is a preset third air pressure difference. And / or, monitoring the air pressure P in the compressor suction pipeline of the heat pump system. If P > P1, it is determined that there is dirt on the fin heat exchanger; where P1 is a preset air pressure.

8. The method for preventing frosting of a vibration-based heat pump system according to claim 1, characterized in that, The vibration-based frost prevention method for the heat pump system further includes the following steps: After the vibration generating unit is started, monitor the stress value F of the heat exchange tubes of the fin heat exchanger. If F ≥ F1, reduce the vibration frequency of the vibration generating unit; where F1 is a preset stress value.

9. A finned heat exchanger, characterized in that, It includes a vibration generating unit, heat exchange tubes, and a plurality of fins. The plurality of fins are arranged in sequence in the same direction. The heat exchange tubes are sequentially passed through the plurality of fins. The vibration generating unit is arranged on the fins. The vibration generating unit can vibrate the fins. The vibration generating unit executes the vibration-based frost prevention method for the heat pump system according to any one of claims 1-8.

10. A heat pump system, characterized in that, It includes the fin heat exchanger according to claim 9.

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