Ultrasonic deicing control method for heat pump chassis and heat pump unit

Abstract

The invention relates to an ultrasonic deicing control method for a heat pump chassis and a heat pump unit, compared with the prior art, according to the ultrasonic deicing control method for the heat pump chassis, the heat operation time, the power-on state of the unit, the deicing temperature interval to which the environment temperature belongs and the temperature difference between the chassis temperature and the air outlet temperature of an outdoor unit are monitored and controlled; according to different power-on states, different deicing temperature intervals and judgment of the temperature difference between the chassis temperature and the air outlet temperature of the outdoor unit and the preset temperature difference, working control over different ultrasonic generators is set, whether the chassis is iced or not and the icing degree can be more accurately judged through the control method, and then more accurate ultrasonic deicing control is conducted; the situation that ice cannot be removed when the ice exists and ice is not removed when the ice does not exist is avoided, and the overall energy efficiency of the unit is improved.

Description

Technical Field

[0001] The invention relates to the control field of a heat pump unit, and in particular to a heat pump chassis ultrasonic deicing control method and a heat pump unit. Background Art

[0002] Heat pump units are an efficient and environmentally friendly energy utilization technology. Its core working principle is the reverse Carnot cycle. By consuming a small amount of electricity or other energy, the heat energy in the low-temperature heat source is transferred to the high-temperature environment to achieve the purpose of heating or cooling. Heat pump units absorb low-temperature heat energy in the air with very little electricity, and convert it into high-temperature heat energy after compression by the compressor, and then transmit it to the place where heating or cooling is required. It is highly favored by consumers and users and has been widely used for refrigeration and hot water supply in hotels, schools, hospitals, saunas, beauty salons, swimming pools, laundries and other places.

[0003] When the heat pump unit is used in cold areas, the outdoor unit's heat exchanger often frosts due to the cold and humid outdoor environment. In order to ensure the normal operation of the unit, the heat pump unit needs to be defrosted periodically. When the heat pump unit defrosts the outdoor unit's heat exchanger by hot air defrosting, electric heating defrosting, or high-temperature refrigerant defrosting, the liquid water droplets formed after the frost melts will gather on the unit chassis. Since the heat pump chassis is in direct contact with the cold environment outside, its temperature is low, and the gathered water will refreeze. If the ice is severe, it will block the ice melt drain or cause mechanical failure of the fan blades.

[0004] In the prior art, the deicing method of the heat pump chassis mainly includes setting an electric heating wire on the chassis, and controlling the start and stop of the electric heating wire according to the detected ambient temperature, so as to achieve chassis deicing. This method is mainly controlled according to the ambient temperature, and the judgment of the icing state of the heat pump chassis is inaccurate, resulting in the situation that there is no deicing or ice is not removed, which wastes energy, increases the energy consumption of the whole machine, reduces the energy efficiency of the whole machine, and increases the user's use cost. Summary of the invention

[0005] Based on this, an object of the present invention is to provide a heat pump chassis ultrasonic deicing control method.

[0006] A heat pump chassis ultrasonic deicing control method comprises the following steps:

[0007] Get the unit running time t in heating mode H :

[0008] If the unit running time t H Greater than or equal to the preset running time t target , then obtain the power-on status of the unit:

[0009] If it is the first time to power on, get the current ambient temperature Determine the current ambient temperature The deicing temperature range belongs to, and the operation control of the ultrasonic generator is performed according to the determined deicing temperature range;

[0010] If it is not the first power-on, get the outdoor unit deicing end time t D , if the deicing end time t D Greater than or equal to the preset de-icing time Get the current ambient temperature Chassis temperature And the outdoor air outlet temperature Calculate the chassis temperature and outdoor unit outlet temperature Temperature difference Determine the current ambient temperature Deicing temperature range, determine the temperature difference in the deicing temperature range Corresponding to preset temperature difference and control the operation of the ultrasonic generator based on the judgment result.

[0011] Compared with the prior art, the heat pump chassis ultrasonic deicing control method proposed in the present application monitors the heating operation time, the power-on status of the unit, the deicing temperature range to which the ambient temperature belongs, and the temperature difference between the chassis temperature and the outdoor unit outlet air temperature. Different working controls of the ultrasonic generator are set according to different power-on states, different deicing temperature ranges, and the temperature difference between the chassis temperature and the outdoor unit outlet air temperature and the preset temperature difference. This control method can more accurately determine whether there is ice on the chassis and the degree of ice, and then make more accurate ultrasonic deicing control to avoid the situation where ice is not removed or deicing is performed without ice, thereby improving the overall energy efficiency of the unit.

[0012] Furthermore, when the unit is powered on for the first time, the operation control of the ultrasonic generator corresponding to each deicing temperature range is as follows:

[0013] If the current ambient temperature In the first deicing temperature range (, T1), the ultrasonic generator is controlled to operate in the first working mode U1 with the first load power P1 for a set number of cycles tp, and then enters the normal operating mode;

[0014] If the current ambient temperature In the second deicing temperature interval [T1, T2), the ultrasonic generator is controlled to operate in the second working mode U2 at the second load power P2 for a set number of cycles tp, and then enters the normal operating mode;

[0015] If the current ambient temperature In the third deicing temperature interval [T2, T3), the ultrasonic generator is controlled to operate in the third working mode U3 at the third load power P3 for a set number of cycles tp, and then enters the normal operating mode;

[0016] If the current ambient temperature In the fourth deicing temperature interval [T3, T4), the ultrasonic generator is controlled to operate in the fourth working mode U4 at the fourth load power P4 for a set number of cycles tp, and then enters the normal operating mode;

[0017] In other cases, the ultrasonic generator will not be started and the normal operation mode will be executed;

[0018] Among them, T1<T2<T3<T4.

[0019] Furthermore, the unit is not powered on for the first time, and the operation control of the ultrasonic generator is performed according to the judgment result in each deicing temperature range as follows:

[0020] If the current ambient temperature In the first deicing temperature range (, T1) and the temperature difference > the first preset temperature difference ΔT1, then the ultrasonic generator is controlled to operate at the first load power P1 in the first working mode U1 until Enter normal operating mode;

[0021] If the current ambient temperature In the second deicing temperature range [T1, T2) and the temperature difference > the second preset temperature difference ΔT2, then the ultrasonic generator is controlled to operate at the second load power P2 in the second working mode U2 until Enter normal operating mode;

[0022] If the current ambient temperature In the third deicing temperature range [T2, T3) and the temperature difference > the third preset temperature difference ΔΔT3, then the ultrasonic generator is controlled to operate at the third load power P3 in the third working mode U3 until Enter normal operating mode;

[0023] If the current ambient temperature In the fourth deicing temperature interval [T3, T4) and the temperature difference > the fourth preset temperature difference ΔT4, then the ultrasonic generator is controlled to operate at the fourth load power P4 in the fourth working mode U4 until Enter normal operating mode;

[0024] In other cases, the ultrasonic generator will not be started and the normal operation mode will be executed;

[0025] Among them, T1<T2<T3<T4, ΔT1>ΔT2>ΔT3>ΔT4.

[0026] Furthermore, T1 of the first deicing temperature interval is -20°C, T2 of the second deicing temperature interval is -10°C, T3 of the third deicing temperature interval is -5°C, and T4 of the fourth deicing temperature interval is 5°C. When the ambient temperature is >5°C, the chassis temperature is higher than 0°C, and there is no risk of chassis icing, so ultrasonic chassis deicing is not performed; when the ambient temperature is ≤5°C, the heat pump operates in heating mode and the temperature of the air decreases after passing through the outdoor heat exchanger, which can reduce the temperature of the chassis to below 0°C. There is a certain risk of chassis icing. This setting can more accurately determine whether the chassis is frozen and the degree of icing.

[0027] Furthermore, the first load power P1 = 120 W, the second load power P2 = 90 W, the third load power P3 = 60 W, and the fourth load power P4 = 30 W. This setting can select appropriate power for deicing according to the degree of ice formation, saving energy.

[0028] Furthermore, the first working mode U1 is that the ultrasonic generator works for 10S and stops for 15S;

[0029] The second working mode U2 is that the ultrasonic generator works for 10S and stops for 60S;

[0030] The third working mode U3 is that the ultrasonic generator works for 10 seconds and stops for 100 seconds;

[0031] The fourth working mode U4 is that the ultrasonic generator works for 10 seconds and stops for 150 seconds.

[0032] The setting of this working mode can further adjust the working time of the ultrasonic generator according to the degree of icing, so as to save energy while meeting the deicing conditions.

[0033] Further, the first preset temperature difference ΔT1 = 5°C, the second preset temperature difference ΔT2 = 4°C, the third preset temperature difference ΔΔT3 = 3.5°C, and the fourth preset temperature difference ΔT4 = 3°C.

[0034] At the same time, the present invention provides a heat pump unit, including: a heat pump chassis, and a compressor, a four-way valve, an electronic expansion valve, an air-side heat exchanger arranged on the heat pump chassis and connected through a refrigerant pipeline circulation, and an external fan arranged on the air-side heat exchanger side, and a temperature detection module, and an ultrasonic generator arranged on one side of the heat pump chassis, and a controller, the controller is communicatively connected with the compressor, the temperature detection module and the ultrasonic generator, and the controller executes any of the above-mentioned heat pump chassis ultrasonic deicing control methods.

[0035] Compared with the prior art, the heat pump unit provided by the present invention has the same effective effect as the above-mentioned heat pump chassis ultrasonic deicing control method, which will not be described here in detail.

[0036] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A bottom view of a system according to an embodiment of the present invention;

[0038] Figure 2 The figure is a flow chart of a control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention.

[0040] In order to solve the problem that the existing heat pump chassis is not accurately judged when deicing is performed according to a single ambient temperature when electric heating is used for deicing, there is a situation where there is no deicing or ice is not removed, which wastes energy and increases the energy consumption of the whole machine; after research and debugging, the present invention proposes a heat pump chassis ultrasonic deicing control method. The method determines the severity of chassis icing by comparing the difference between the chassis temperature and the outdoor unit outlet temperature, and determines the working mode of the ultrasonic generator according to different ambient temperature ranges, so as to achieve more accurate, efficient and reliable ultrasonic deicing control.

[0041] For specific implementation, please refer to Figure 1 The heat pump unit with the heat pump chassis ultrasonic deicing control method proposed in the present invention includes a heat pump chassis 1, and a compressor (not shown) arranged on the heat pump chassis 1 and connected through a refrigerant pipeline circulation, a four-way valve (not shown), a water-side heat exchanger (not shown), an electronic expansion valve (not shown), an air-side heat exchanger 2, and an external fan 3 arranged on the side of the air-side heat exchanger 2, and a temperature detection module (not shown), and an ultrasonic generator 4 arranged on one side of the heat pump chassis 1, and a controller (not shown), and other auxiliary pipes. The controller is connected to the compressor, the temperature detection module and the ultrasonic generator 4. The water-side heat exchanger can also be arranged in other housing chassis.

[0042] The temperature detection module includes a first temperature sensor, a second temperature sensor and a third temperature sensor. The first temperature sensor can be arranged on the outside of the air side heat exchanger 2, or on the housing of the heat pump unit, which is not limited in this application. It is used to collect the ambient temperature. The second temperature sensor is arranged on the heat pump chassis 1 and is used to collect the temperature of the heat pump chassis 1. The third temperature sensor is arranged at the air outlet of the outdoor fan to collect the air outlet temperature of the outdoor fan.

[0043] The controller receives the temperature signal collected by the temperature detection module and performs ultrasonic deicing control according to the stored calculation and judgment program.

[0044] For details, please refer to Figure 2 The heat pump chassis ultrasonic deicing control method of the present invention includes the following steps.

[0045] S10 obtains the unit running time t in heating mode H :

[0046] If the unit running time t H Greater than or equal to the preset running time t target , then obtain the power-on status of the unit:

[0047] If it is the first time to power on, execute step S20;

[0048] If it is not the first power-on, execute step S30.

[0049] The preset running time t target The value range is 5 to 10 minutes.

[0050] S20 (initial ultrasonic chassis deicing mode) obtains the current ambient temperature Determine the current ambient temperature The deicing temperature range belongs to, and the operation of the ultrasonic generator is controlled according to the determined deicing temperature range.

[0051] The de-icing temperature range is determined by experimental division according to the operating environment and aging condition of the unit.

[0052] In this embodiment, four deicing temperature intervals are divided, and different ultrasonic generators are controlled according to the deicing temperature intervals, as follows:

[0053] If the current ambient temperature In the first deicing temperature range (, T1), that is Then the ultrasonic generator is controlled to operate in the first working mode U1 at the first load power P1 for the set number of cycles tp, and then enters the normal operating mode;

[0054] If the current ambient temperature In the second deicing temperature interval [T1, T2), that is, Then the ultrasonic generator is controlled to operate in the second working mode U2 at the second load power P2 for the set number of cycles tp, and then enters the normal operating mode;

[0055] If the current ambient temperature In the third deicing temperature interval [T2, T3), that is, Then the ultrasonic generator is controlled to operate in the third working mode U3 at the third load power P3 for the set number of cycles tp, and then enters the normal operating mode;

[0056] If the current ambient temperature In the fourth deicing temperature interval [T3, T4), that is, Then the ultrasonic generator is controlled to operate in the fourth working mode U4 at the fourth load power P4 for the set number of cycles tp, and then enters the normal operating mode;

[0057] In other cases, the ultrasonic generator will not be started and the normal operation mode will be executed;

[0058] Among them, T1<T2<T3<T4.

[0059] The set cycle number tp ranges from 3 to 5.

[0060] In specific implementation, T1 = -20°C, T2 = -10°C, T3 = -5°C, and T4 = 5°C.

[0061] The P1=120W, P2=90W, P3=60W, and P4=30W.

[0062] The first working mode U1 is that the ultrasonic generator works for 10 seconds and stops for 15 seconds.

[0063] The second working mode U2 is that the ultrasonic generator works for 10 seconds and stops for 60 seconds.

[0064] The third working mode U3 is that the ultrasonic generator works for 10 seconds and stops for 100 seconds.

[0065] The fourth working mode U4 is that the ultrasonic generator works for 10 seconds and stops for 150 seconds.

[0066] S30 Get the end time of outdoor unit deicing t D :

[0067] If the de-icing end time t D Less than the preset de-icing time Then continue to obtain the deicing end time t D ;

[0068] If the de-icing end time t D Greater than or equal to the preset de-icing time Then execute step S40.

[0069] S40 obtains the current ambient temperature Chassis temperature And the outdoor air outlet temperature Calculate the chassis temperature and outdoor unit outlet temperature Temperature difference Determine the current ambient temperature Deicing temperature range, determine the temperature difference in the deicing temperature range Corresponding to preset temperature difference and control the operation of the ultrasonic generator based on the judgment result.

[0070] The temperature difference satisfy:

[0071]

[0072] The de-icing temperature range is determined by experimental division according to the operating environment and aging condition of the unit.

[0073] In this embodiment, four deicing temperature intervals are divided, and different ultrasonic generators are controlled according to the deicing temperature intervals, as follows:

[0074] If the current ambient temperature In the first deicing temperature range (, T1) and the temperature difference >The first preset temperature difference ΔT1, that is and Then the ultrasonic generator is controlled to operate in the first working mode U1 with the first load power P1 until Enter normal operating mode;

[0075] If the current ambient temperature In the second deicing temperature range [T1, T2) and the temperature difference >The second preset temperature difference ΔT2, that is and Then the ultrasonic generator is controlled to operate at the second load power P2 according to the second working mode U2 until Enter normal operating mode;

[0076] If the current ambient temperature In the third deicing temperature range [T2, T3) and the temperature difference >The third preset temperature difference ΔΔT3, that is and Then the ultrasonic generator is controlled to operate in the third working mode U3 with the third load power P3 until Enter normal operating mode;

[0077] If the current ambient temperature In the fourth deicing temperature interval [T3, T4) and the temperature difference > The fourth preset temperature difference ΔT4, that is and Then the ultrasonic generator is controlled to operate in the fourth working mode U4 with the fourth load power P4 until Enter normal operating mode;

[0078] In other cases, the ultrasonic generator will not be started and the normal operation mode will be executed;

[0079] Among them, T1<T2<T3<T4, ΔT1>ΔT2>ΔT3>ΔT4.

[0080] In a specific implementation, ΔT1=5°C, ΔT2=4°C, ΔT3=3.5°C, and ΔT4=3°C.

[0081] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that, unless otherwise specified, "multiple" and "several" refer to two or more; "and / or" refers to and includes any or all possible combinations of one or more associated listed items; "first", "second", "third", etc. are only used to distinguish, rather than to describe a specific order or sequence, and cannot be understood as indicating or implying relative importance. When the above description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0082] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.

Claims

1. A heat pump chassis ultrasonic deicing control method, characterized in that: The following steps are involved: Get the unit running time t in heating mode H : If the unit running time t H Greater than or equal to the preset running time t target , then obtain the power-on status of the unit: If it is the first time to power on, get the current ambient temperature Determine the current ambient temperature The deicing temperature range belongs to, and the operation control of the ultrasonic generator is performed according to the determined deicing temperature range; If it is not the first power-on, get the outdoor unit deicing end time t D , if the deicing end time t D Greater than or equal to the preset de-icing time Get the current ambient temperature Chassis temperature And the outdoor air outlet temperature Calculate the chassis temperature and outdoor unit outlet temperature Temperature difference Determine the current ambient temperature Deicing temperature range, determine the temperature difference in the deicing temperature range Corresponding to preset temperature difference and control the operation of the ultrasonic generator based on the judgment result.

2. The heat pump chassis ultrasonic deicing control method according to claim 1, characterized in that: This is the first time the unit is powered on. The working control of the ultrasonic generator corresponding to each deicing temperature range is as follows: If the current ambient temperature In the first deicing temperature range (, T1), the ultrasonic generator is controlled to operate in the first working mode U1 with the first load power P1 for a set number of cycles tp, and then enters the normal operating mode; If the current ambient temperature In the second deicing temperature interval [T1, T2), the ultrasonic generator is controlled to operate in the second working mode U2 at the second load power P2 for a set number of cycles tp, and then enters the normal operating mode; If the current ambient temperature In the third deicing temperature interval [T2, T3), the ultrasonic generator is controlled to operate in the third working mode U3 at the third load power P3 for a set number of cycles tp, and then enters the normal operating mode; If the current ambient temperature In the fourth deicing temperature interval [T3, T4), the ultrasonic generator is controlled to operate in the fourth working mode U4 at the fourth load power P4 for a set number of cycles tp, and then enters the normal operating mode; In other cases, the ultrasonic generator will not be started and the normal operation mode will be executed; Among them, T1<T2<T3<T4.

3. The heat pump chassis ultrasonic deicing control method according to claim 1 or 2, characterized in that: This is not the first time the unit is powered on. The operation control of the ultrasonic generator in each deicing temperature range is carried out according to the judgment results as follows: If the current ambient temperature In the first deicing temperature range (, T1) and the temperature difference > the first preset temperature difference ΔT1, then the ultrasonic generator is controlled to operate at the first load power P1 in the first working mode U1 until Enter normal operating mode; If the current ambient temperature In the second deicing temperature range [T1, T2) and the temperature difference > the second preset temperature difference ΔT2, the ultrasonic generator is controlled to operate at the second load power P2 according to the second working mode U2 until Enter normal operating mode; If the current ambient temperature In the third deicing temperature range [T2, T3) and the temperature difference > the third preset temperature difference ΔΔT3, then the ultrasonic generator is controlled to operate at the third load power P3 in the third working mode U3 until Enter normal operating mode; If the current ambient temperature In the fourth deicing temperature interval [T3, T4) and the temperature difference > the fourth preset temperature difference ΔT4, then the ultrasonic generator is controlled to operate at the fourth load power P4 in the fourth working mode U4 until Enter normal operating mode; In other cases, the ultrasonic generator will not be started and the normal operation mode will be executed; Among them, T1<T2<T3<T4, ΔT1>ΔT2>ΔT3>ΔT4.

4. The heat pump chassis ultrasonic deicing control method according to claim 3, characterized in that: The temperature difference satisfy: In the formula, represents the chassis temperature, and Indicates the temperature difference of the outdoor unit outlet air temperature 5. The heat pump chassis ultrasonic deicing control method according to claim 2 or 4, characterized in that: The first deicing temperature interval is T1 = -20°C, the second deicing temperature interval is T2 = -10°C, the third deicing temperature interval is T3 = -5°C, and the fourth deicing temperature interval is T4 = 5°C.

6. The heat pump chassis ultrasonic deicing control method according to claim 5, characterized in that: The first load power P1 = 120 W, the second load power P2 = 90 W, the third load power P3 = 60 W, and the fourth load power P4 = 30 W.

7. The heat pump chassis ultrasonic deicing control method according to claim 6, characterized in that: The first working mode U1 is that the ultrasonic generator works for 10S and stops for 15S; The second working mode U2 is that the ultrasonic generator works for 10S and stops for 60S; The third working mode U3 is that the ultrasonic generator works for 10 seconds and stops for 100 seconds; The fourth working mode U4 is that the ultrasonic generator works for 10 seconds and stops for 150 seconds.

8. The heat pump chassis ultrasonic deicing control method according to claim 4, characterized in that: The first preset temperature difference ΔT1 = 5°C, the second preset temperature difference ΔT2 = 4°C, the third preset temperature difference ΔΔT3 = 3.5°C, and the fourth preset temperature difference ΔT4 = 3°C.

9. The heat pump chassis ultrasonic deicing control method according to claim 6 or 7, characterized in that: The set cycle number tp ranges from 3 to 5.

10. A heat pump unit, comprising: A heat pump chassis, and a compressor, a four-way valve, an electronic expansion valve, an air-side heat exchanger, and an external fan arranged on the air-side heat exchanger side, and a temperature detection module, and an ultrasonic generator arranged on one side of the heat pump chassis, and a controller, wherein the controller is communicatively connected with the compressor, the temperature detection module and the ultrasonic generator, and is characterized in that the controller executes the heat pump chassis ultrasonic deicing control method as described in any one of claims 1 to 9.

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